The heat transfer coefficient of forced convection for turbulent flow within a tube can be calculated by combining dimensional analysis and experiment.
Turbulent flow for a plate heat exchanger can be achieved under low Reynolds number.
Forced convection is a heat transfer mechanism that occurs when a fluid's flow is generated by an external device like a pump, compressor, or fan. It is a highly efficient and effective way to transfer heat. The heat transfer coefficient of forced convection for turbulent flow within a tube can be calculated by combining dimensional analysis and experiment. The coefficient is given as:
h = N . (ρU²) / (µPr(2/3))
Here, N is a constant, ρ is the fluid density, U is the fluid velocity, µ is the dynamic viscosity, and Pr is the Prandtl number. The Prandtl number represents the ratio of the fluid's momentum diffusivity to its thermal diffusivity.
The heat transfer coefficient can also be calculated indirectly by measuring the temperature difference between the fluid and the tube wall. This is done using the following formula:
h = (Q / A)(1 / ΔT_lm)
Here, Q is the heat transfer rate, A is the surface area, and ΔT_lm is the logarithmic mean temperature difference.
A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids. It is a highly efficient device that is commonly used in many industries, including chemical processing, food and beverage, and HVAC.
The efficiency of a plate heat exchanger depends on the flow regime of the fluids passing through it. Turbulent flow is the most efficient regime for a plate heat exchanger because it provides the maximum heat transfer rate. Turbulent flow for a plate heat exchanger can be achieved under low Reynolds number. Answer: The heat transfer coefficient of forced convection for turbulent flow within a tube can be calculated by combining dimensional analysis and experiment. Turbulent flow for a plate heat exchanger can be achieved under low Reynolds number.
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A charge Q is uniformly distributed along the z-axis from z=-a to z=a. Find a suitable expression for electric field intensity vector E at any point P whose coordinates in cylindrical coordinates are (r, q, z). 15 (c) Three infinitely long, straight filamentary wires occupy the lines x = 0, y = 0; x = 1, y = 0 and x = 0, y = 1. Each wire carries a current of 1 A in z direction. Find the magnetic flux density vector B at any point P whose coordinates in rectangular system of coordinates are (1, 1, 100).
Part (a) For the uniformly distributed charge along the z-axis, we will find the electric field intensity vector E at any point P whose coordinates are given in cylindrical coordinates as (r, q, z). The given charge is Q.
The charge per unit length is,λ = Q / 2a.The total charge on the rod can be calculated by integrating λ from -a to a, as follows, Q = λ * 2aTherefore, Q = (Q/2a) * 2aHence, λ = Q / 2aAccording to Coulomb’s Law, the electric field intensity vector is given by the following expression E = kQ / r2where, k is the Coulomb’s constant and r is the distance from the charge to the point P.
In cylindrical coordinates, the distance r is given by, r = √(x2 + y2) The direction of the electric field intensity vector is always along the line joining the point P to the charge. As the charge is along the z-axis, the direction of the electric field intensity vector at point P is along the z-axis.
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Show that, if the stator resistance of a three-phase induction motor is negligible, the ratio of motor starting torque T, to the maximum torque Tmax can be expressed as: Ts 2 Tmax 1 sm + Sm 1 where sm is the per-unit slip at which the maximum torque occurs. (10 marks)
A three-phase induction motor consists of two basic parts: the stator and the rotor. The stator is a stationary component, whereas the rotor rotates in response to the magnetic field induced by the stator.In an induction motor, the maximum torque is produced when the rotor is rotating at the speed at which the rotor slips, which is referred to as the maximum torque speed.
The torque produced by the motor is proportional to the slip s, which is defined as the difference between the rotor speed and the synchronous speed. When the rotor is stationary, the slip is equal to one or 100 percent. As the rotor speed increases, the slip decreases, and the torque produced by the motor increases.The torque produced by an induction motor is proportional to the square of the stator current, which is also proportional to the stator voltage divided by the stator resistance. If the stator resistance is negligible, the stator current is essentially infinite, and the torque produced by the motor is also infinite.
However, this is not possible because the stator voltage is limited, and the current that can be drawn from the power supply is also limited.Therefore, when the stator resistance is negligible, the ratio of the motor starting torque T to the maximum torque Tmax can be expressed as:Ts/Tmax = 2/(sm + Sm)Where sm is the per-unit slip at which the maximum torque occurs, and Sm is the per-unit slip at which the starting torque occurs. The ratio of Ts to Tmax is a measure of the starting performance of an induction motor. A high value of Ts/Tmax indicates good starting performance, whereas a low value indicates poor starting performance.
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Transfer function of an unity-feedback LTI system (H(s)=1) is
G(s) = K / (s+1)(s+3)(s+7)(s+10)
a) Find gain and settling time of the uncompensates system when the damping ratio is 0.7.
b) Find the transfer function of a lag-lead compensator that will yield a settling time 0.4 second
shorter than that of the uncompensated system, with a damping ratio of 0.7, and improve the steady-state
error by a factor of 20.
c) Find the phase and gain-margin of the compensated system using the Bode plot
The unity-feedback LTI system has a transfer function G(s) = K / (s+1)(s+3)(s+7)(s+10). We are required to solve the following questions:
a) To find the gain and settling time of the uncompensated system with a damping ratio of 0.7, we need to evaluate the transfer function. The gain of the system is given by K, which can be determined by substituting s = 0 into the transfer function.
The settling time is the time it takes for the system to reach a steady-state within a certain tolerance. It can be estimated by analyzing the poles of the transfer function. In this case, the poles are located at s = -1, -3, -7, and -10. The settling time can be roughly estimated as 4 / (damping ratio * natural frequency), where the natural frequency is the average of the real parts of the poles.
b) To design a lag-lead compensator that reduces the settling time by 0.4 seconds compared to the uncompensated system, we need to add a lag-lead network to the system. A lag-lead compensator is a combination of a lag compensator and a lead compensator.
The transfer function of the compensator can be designed based on the desired settling time and damping ratio. The lag compensator improves steady-state accuracy, while the lead compensator improves transient response. By adjusting the compensator parameters, we can achieve the desired settling time and improve the steady-state error by a factor of 20.
c) To find the phase and gain margins of the compensated system using the Bode plot, we need to plot the Bode diagram of the compensated system and analyze the gain and phase margins. The gain margin is the amount of gain that can be added to the system before it becomes unstable, and the phase margin is the amount of phase shift that can be applied before the system becomes unstable. By analyzing the Bode plot, we can determine the phase and gain margins and assess the stability and robustness of the compensated system.
In summary, for an unity-feedback LTI system with a given transfer function, we can determine the gain and settling time of the uncompensated system for a specific damping ratio. To achieve a shorter settling time and improved steady-state error, a lag-lead compensator can be designed. The Bode plot can be used to analyze the phase and gain margins of the compensated system, providing insights into its stability and robustness.
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In a Wireless (Wifi) network using WPA2, which of the following is a true statement about an attacker who is not connected to the AP? O
a. An attacker can see only traffic to or from their own computer, but can also see any broadcast traffic sent on the network. b. An attacker can only see traffic between their own computer and any other computer in the network. c. An attacker can see potentially see all hosts' traffic with wireshark, but can't decrypt it (without cracking the encryption password). d. An attacker can potentially see all traffic on the network between any two hosts, provided it's not encrypted at the application layer.
In a Wireless (Wifi) network using WPA2, a true statement about an attacker who is not connected to the AP is that the attacker can potentially see all traffic on the network between any two hosts, provided it's not encrypted at the application layer.
Option D: An attacker can potentially see all traffic on the network between any two hosts, provided it's not encrypted at the application layer is a true statement about an attacker who is not connected to the AP.The Wi-Fi Protected Access II (WPA2) is the most commonly used method of securing wireless networks. The data is encrypted on both ends by the client device and the wireless access point, making it much harder to intercept. However, it is important to note that even with WPA2, there are still potential security vulnerabilities.
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Help with write a program in C# console app. That reads
a text file and displays the number of words.
Thanks!
To solve the problem, a C# console application needs to be written that reads a text file and displays the number of words in it.
To implement the program, we can follow these steps:
Open the text file using the StreamReader class and provide the file path as an argument.
Read the entire content of the file using the ReadToEnd method of the StreamReader object.
Split the content into words using the Split method, specifying the space character (' ') as the delimiter.
Get the count of the words using the Length property of the resulting string array.
Display the number of words on the console.
Here's an example code snippet that demonstrates the above steps:
CSharp
Copy code
using System;
using System.IO;
class Program
{
static void Main()
{
string filePath = "path/to/your/file.txt";
try
{
using (StreamReader sr = new StreamReader(filePath))
{
string content = sr.ReadToEnd();
string[] words = content.Split(' ');
int wordCount = words.Length;
Console.WriteLine("Number of words: " + wordCount);
}
}
catch (FileNotFoundException)
{
Console.WriteLine("File not found.");
}
catch (Exception e)
{
Console.WriteLine("An error occurred: " + e.Message);
}
Console.ReadLine();
}
}
In this code, we use the StreamReader class to read the content of the text file specified by the filePath. The content is then split into words using the space character as the delimiter. The count of the words is obtained from the resulting string array and displayed on the console. Proper exception handling is included to handle file-related errors.
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Circuit What is the purpose of transformer tappings? (2) A single-phase transformer has 800 turns on the primary winding which is connected to a 240 V AC supply. The voltage and current on the secondary side is 16 volts and 8 A respectively. Determine: 5.3.1 The number of turns on the secondary side 5.3.2 The value of the primary current 5.3.3 The turns ratio 5.3.4 The voltage per turn
1. The number of turns on the secondary side of the transformer is 50 turns. 2. The value of the primary current is 0.04 A. 3. The turns ratio of the transformer is 0.1. 4. The voltage per turn of the transformer is 0.03 V/turn.
1. To determine the number of turns on the secondary side, we can use the turns ratio formula:
Turns ratio = (Number of turns on the secondary side) / (Number of turns on the primary side)
Rearranging the formula, we get:
Number of turns on the secondary side = Turns ratio * Number of turns on the primary side
Given that the turns ratio is 0.02 (16 V / 800 V), we can calculate:
Number of turns on the secondary side = 0.02 * 800 = 16 turns
Therefore, the number of turns on the secondary side is 16 turns.
2. The value of the primary current can be calculated using the formula:
Primary current = Secondary current * (Number of turns on the secondary side) / (Number of turns on the primary side)
Given that the secondary current is 8 A and the number of turns on the secondary side is 16 turns, and the number of turns on the primary side is 800 turns, we can calculate:
Primary current = 8 A * (16 turns / 800 turns) = 0.16 A
Therefore, the value of the primary current is 0.16 A.
3. The turns ratio is defined as the ratio of the number of turns on the secondary side to the number of turns on the primary side. In this case, the turns ratio is given as 0.02 (16 V / 800 V).
Therefore, the turns ratio of the transformer is 0.02.
4. The voltage per turn of the transformer can be calculated by dividing the voltage on the secondary side by the number of turns on the secondary side. In this case, the voltage on the secondary side is 16 V and the number of turns on the secondary side is 16 turns.
Voltage per turn = Voltage on the secondary side / Number of turns on the secondary side
Voltage per turn = 16 V / 16 turns = 1 V/turn
Therefore, the voltage per turn of the transformer is 1 V/turn.
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A message signal m(t)=2cos(2π×10 3
t) frequency modulates (FM) a carrier frequency which fluctuates between the higher frequency, f H
=1.004MHz and lower frequency, f L
=996kHz. Based on the parameters given, deduce the final expression of FM signal, S FM
(t) in time domain. Assume that the amplitude of the FM signal is 1 volt. [15 Marks]
Based on the given parameters and the general equations for FM modulation, we can deduce the form of the FM signal in terms of its carrier frequency and the message signal. However, obtaining a closed-form expression for S_FM(t) in the time domain would require further integration and analysis.
To deduce the final expression of the FM signal, S_FM(t), we need to combine the message signal m(t) with the carrier signal, which is frequency modulated based on the given parameters.
The FM signal is given by the equation:
S_FM(t) = A_c * cos(2π * f_c * t + φ(t))
where A_c is the amplitude of the carrier signal, f_c is the instantaneous carrier frequency, t is the time, and φ(t) is the phase deviation.
In frequency modulation, the instantaneous carrier frequency is given by:
f_c = f_c0 + Δf * m(t)
where f_c0 is the center carrier frequency, Δf is the frequency deviation, and m(t) is the message signal.
Given the parameters:
f_H = 1.004 MHz
f_L = 996 kHz
f_c0 = (f_H + f_L) / 2 = (1.004 MHz + 996 kHz) / 2 = 1 MHz
Δf = (f_H - f_L) / 2 = (1.004 MHz - 996 kHz) / 2 = 4 kHz
The message signal is given by:
m(t) = 2 * cos(2π * 10^3 * t)
Substituting the values into the equation for f_c, we get:
f_c = 1 MHz + 4 kHz * 2 * cos(2π * 10^3 * t)
Now, we can write the final expression of the FM signal, S_FM(t), by substituting the values into the equation for the FM signal:
S_FM(t) = cos(2π * 1 MHz * t + φ(t))
where φ(t) represents the phase deviation, which is determined by the integral of the instantaneous carrier frequency:
φ(t) = ∫[0 to t] 2π * (1 MHz + 4 kHz * 2 * cos(2π * 10^3 * τ)) dτ
However, determining the exact expression for φ(t) requires integrating the equation. Without further information or constraints, it may not be feasible to deduce a closed-form expression for S_FM(t) in the time domain.
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Question 3 Given the two functions, f(n)= 2n²+ 10 and g(n) = n, select the most suitable relationship between the two functions:
O f(n) is in 2(g(n))
O f(n) is in O(n) O f(n) is (g(n)) O f(n) is in o(g(n)) O f(n) is in O(g(n)) Question 4 Given the two growth functions, f(n) = n³/100 + 10n² - 100 and g(n) = 10n² where n > 1, what is the smallest value of n (no) such that f(n) is in O(g(n))? O 100 O 20
O 10 O 1000 O 11 Question 5 N is greater than 2. Select the tightest (best) lower bound of the growth rate, T(n) = n. O ohm(nlog(n)) O ohm(n³/2) O ohm(log(n)) O ohm(n^0.5)
O 22(n^0.9) Question 6 Suppose that a particular algorithm has a time complexity, T(n) = 8 * n³/2 and a particular machine take t time for n inputs with this algorithm. If you are given a machine 216 times faster with the same algorithm. How many inputs could we process in the new machine in the same amount of time t? O n + 36 O n + 216 O 216n O n+6
O 36n
The concepts of time complexity and computational resources, which are fundamental in computer science. They assess the understanding of Big O notation, theta notation, and omega notation.
For question 3, f(n) = 2n²+10 grows at a much faster rate than g(n) = n, hence f(n) is in O(n²), not O(n) or any other option given. For question 4, you would need to find a value of n where n³/100 + 10n² - 100 <= C * 10n² for all n ≥ n0, where C is a positive constant. This requires some calculus or numerical computation. For question 5, the function T(n) = n grows linearly, so it's lower bound is ohm(n). For question 6, if a machine is 216 times faster, it can process 216n inputs in the same amount of time that the slower machine processes n inputs. Big O notation is a mathematical notation used in computer science to describe the performance or complexity of an algorithm in terms of input size.
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Calculate the power in Watts) in one sideband of an AM signal whose carrier power is 86 Watts. The unmodulated current is 1.52 A while the modulated current is 1.75 A. No need for a solution. Just write your numeric answer in the space provided. Round off your answer to 2 decimal places.
The power in one sideband of an AM (amplitude modulation) signal can be calculated using the formula:
Psb = (Ic^2 - Iu^2) / 2
where Psb is the power in one sideband, Ic is the modulated current, and Iu is the unmodulated current.
In this case, the unmodulated current (Iu) is given as 1.52 A and the modulated current (Ic) is given as 1.75 A. We can substitute these values into the formula:
Psb = (1.75^2 - 1.52^2) / 2
Calculating the values inside the brackets:
(1.75^2 - 1.52^2) = (3.0625 - 2.3104) = 0.7521
Dividing this by 2:
0.7521 / 2 = 0.37605
Rounding off the answer to 2 decimal places, we get:
Psb ≈ 0.38 Watts
Therefore, the power in one sideband of the AM signal is approximately 0.38 Watts.
The power in one sideband of the AM signal with a carrier power of 86 Watts, an unmodulated current of 1.52 A, and a modulated current of 1.75 A is approximately 0.38 Watts.
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Give examples of the following two project categories: i). Immediate, Near and Long-Term ROI Projects ii). Low, Medium, High as well as No-Margin and Loss-Making Projects 0.3 How can u
Immediate, near, and long-term ROI projects refer to different project categories based on the expected return on investment over different timeframes.
For the first category, immediate ROI projects are those that generate a quick return on investment. These projects typically have a short implementation period and provide immediate benefits, such as cost savings, increased efficiency, or revenue generation. An example could be implementing an automated inventory management system that reduces manual errors and lowers operational costs. Near-term ROI projects have a slightly longer time horizon but still aim to deliver a return on investment within a relatively short period. These projects often involve implementing new technologies or processes that lead to improved productivity or customer satisfaction. For instance, developing a mobile app for a retail business to enhance customer engagement and drive sales can be considered a near-term ROI project. Long-term ROI projects have a more extended timeline for realizing the return on investment. These projects typically involve strategic initiatives, such as entering new markets, developing new products, or acquiring other companies. The benefits may take several years to materialize but have the potential for significant long-term gains. For example, building a manufacturing facility in a new region to tap into emerging markets can be a long-term ROI project.
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) Figure Q2.2, below, depicts a series voltage regulator circuit with current limiting capability. (0) Explain briefly how the current in the load is limited to a maximum level and specify which component determines the value of this maximum current [5 marks] (ii) The required load voltage is 9.5 V and the current is to be limited to a maximum of 2 A. Calculate the values of the Zener diode voltage and resistor, Rs, required. [6 marks] (iii) Specify suitable power ratings for the Zener diode and resistor, Rs, and justify your choice.
The series voltage regulator circuit with current limiting capability limits the current in the load to a maximum level. The value of this maximum current is determined by the resistor connected in series with the load.
In the given circuit, the current in the load is limited to a maximum level by utilizing a series resistor (Rs) connected between the positive terminal of the voltage source and the load. When the load resistance is such that it draws a current higher than the desired maximum level, the voltage across the load increases. This increased voltage across the load is also present across the series resistor (Rs).
The value of the maximum current can be determined using Ohm's Law, which states that the current (I) flowing through a resistor is equal to the voltage (V) across the resistor divided by its resistance (R). By selecting an appropriate value for resistor Rs, the desired maximum current can be obtained. For the given problem, the maximum current is specified as 2 A. Therefore, Rs can be calculated using the equation Rs = V/I, where V is the voltage across Rs and I is the maximum current.
To determine the values of the Zener diode voltage and resistor Rs required for a load voltage of 9.5 V and a maximum current of 2 A, additional information about the circuit is needed. The figure mentioned in the question, Figure Q2.2, is missing, so the exact configuration of the circuit cannot be determined. The Zener diode voltage and Rs values depend on the specific circuit design and requirements. Once the circuit configuration is known, the Zener diode voltage can be chosen based on the desired load voltage and the voltage drop across Rs. The value of Rs can then be calculated using the desired maximum current and the voltage drop across Rs, as mentioned earlier.
Regarding the power ratings for the Zener diode and resistor Rs, they need to be selected based on the expected power dissipation. The power rating of the Zener diode should be higher than the maximum power it will dissipate. Similarly, the power rating of the resistor Rs should be chosen to handle the power dissipation across it. The exact power ratings will depend on the calculated values of the load current, voltage, and the resistance values chosen for Rs and the Zener diode.
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Mark all that apply by writing either T (for true) or F (for false) in the blank box before each statement. Regarding splay trees: T In top-down splaying, a right rotation is always applied after visiting the left subtree and a left rotation is always applied after visiting the right subtree. T In bottom-up splaying, a right rotation is always applied after visiting the left subtree and a left rotation is always applied after visiting the right subtree. F After searching for an element, searching for it again will restore the original tree shape. T When a removal splits the tree in two, a joining step will splay the largest element in the left part to the root, then connect the whole right part as the right subtree of that root.
The true statements are:In top-down splaying, a right rotation is always applied after visiting the left subtree and a left rotation is always applied after visiting the right subtree.In bottom-up splaying, a right rotation is always applied after visiting the left subtree and a left rotation is always applied after visiting the right subtree.
Here are the solutions to the given inquiries: In relation to splay trees: A right rotation is always made after visiting the left subtree in top-down splaying, and a left rotation is always made after visiting the right subtree. True) In bottom-up splaying, a right rotation is always performed following a visit to the left subtree, and a left rotation is always performed following a visit to the right subtree. True) The tree's original shape will be restored by searching for an element once more. False)A joining step will connect the entire right part as the right subtree of the root after a removal splits the tree in two. True)
Thus, the genuine assertions are: After visiting the left subtree, top-down splaying always applies a right rotation, and after visiting the right subtree, it always applies a left rotation. A right rotation is always made after visiting the left subtree in bottom-up splaying, and a left rotation is always made after visiting the right subtree. A joining step will connect the entire right part as the right subtree of the root after a removal splits the tree in two. The largest element in the left part will then be splayed to the root.
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write a function called examineList(xs) that takes a list called xs and examines the values. If the value contains 8 letters or long or less, this function doesn't return. if more than 8 letters reurn "value too long". If one of the value is integer, return -1.
print(examineList(['a','cat','4'] returns -1
print(examineList(['a','cat,'dog']) returns None
Here is a function called examineList(xs) that examines the values in a list called xs in accordance with the criteria specified:
def examineList(xs):
for value in xs:
if isinstance(value, int):
return -1
elif len(value) > 8:
return "value too long"
return None
The function examineList(xs) iterates over each value in the list xs using a for loop.
For each value, it first checks if it is an integer using the isinstance() function. If it is, the function gives a -1 result right away.
The len() function is used to determine whether a value's length exceeds 8 if it is not an integer.
If none of the values in the list satisfy the above conditions, the function returns None.
The examineList(xs) function allows you to examine a list and determine if any value is an integer or if any value has a length greater than 8. By returning appropriate values or None, the function provides a simple way to analyze and handle different cases based on the list contents.
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Explain any one type of enclosure used in DC motors with necessary diagram
One type of DC motor is the brushed DC motor, also known as the DC brushed motor. A brushed DC motor is a type of electric motor that converts electrical energy into mechanical energy. It consists of several key components, including a stator, rotor, commutator, brushes, and a power supply.
Stator: The stator is the stationary part of the motor and consists of a magnetic field created by permanent magnets or electromagnets. The stator provides the magnetic field that interacts with the rotor.
Rotor: The rotor is the rotating part of the motor and is connected to the output shaft. It consists of a coil or multiple coils of wire wound around a core. The rotor is responsible for generating the mechanical motion of the motor.
Commutator: The commutator is a cylindrical structure mounted on the rotor shaft and is divided into segments. The commutator serves as a switch, reversing the direction of the current in the rotor coil as it rotates, thereby maintaining the rotational motion.
Brushes: The brushes are carbon or graphite contacts that make electrical contact with the commutator segments. The brushes supply electrical power to the rotor coil through the commutator, allowing the flow of current and generating the magnetic field necessary for motor operation.
Power supply: The power supply provides the electrical energy required to operate the motor. In a DC brushed motor, the power supply typically consists of a DC voltage source, such as a battery or power supply unit.
When the power supply is connected to the motor, an electrical current flows through the brushes, commutator, and rotor coil. The interaction between the magnetic field of the stator and the magnetic field produced by the rotor coil causes the rotor to rotate. As the rotor rotates, the commutator segments contact the brushes, reversing the direction of the current in the rotor coil, ensuring continuous rotation.
The brushed DC motor is a common type of DC motor that uses brushes and a commutator to convert electrical energy into mechanical energy. It consists of a stator, rotor, commutator, brushes, and a power supply. The interaction between the magnetic fields produced by the stator and rotor enables the motor to rotate and generate mechanical motion.
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2. Write a lex program to count the number of 'a' in the given input text.
The following Lex program counts the number of occurrences of the letter 'a' in the given input text. It scans the input character by character and increments a counter each time it encounters an 'a'.
In Lex, we can define patterns and corresponding actions to be performed when those patterns are matched. The following Lex program counts the number of 'a' characters in the input text:
Lex Code:
%{
int count = 0;
%}
%%
[aA] { count++; }
\n { ; }
. { ; }
%%
int main() {
yylex();
printf("Number of 'a' occurrences: %d\n", count);
return 0;
}
The program starts with a declaration section, where we define a variable count to keep track of the number of 'a' occurrences. In the Lex specification section, we define the patterns and corresponding actions. The pattern [aA] matches any occurrence of the letter 'a' or 'A', and the associated action increments the count variable. The pattern \n matches newline characters and the pattern . matches any other character. For both these patterns, we use an empty action { ; } to discard the matched characters without incrementing the count.
In the main() function, we call yylex() to start the Lex scanner. Once the scanning is complete, we print the final count using printf().
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Write a command to search only files in /usr directory, whose name is ending with dir. [2 marks ] 2. Write a command to search all the files in ending with .doc, whose does not contain a pattern "package" with line number before it. [2 marks ] 3. Write a command to show the shared libraries used by an application CIS.
To search only files in the "/usr" directory whose names end with "dir," you can use the command: `find /usr -type f -name "*dir"`.
1. The command `find` is used to search for files and directories. In this case, we specify the directory "/usr" with the option `-type f` to search for files only, and the option `-name "*dir"` to match files whose names end with "dir."
2. The command `grep` is used to search for patterns in files. The option `-r` is used for recursive searching, the option `-L` is used to list files that do not contain the pattern, and `--include=*.doc` specifies that the search should be limited to files with the ".doc" extension. The pattern `'^[0-9]*.*package'` matches lines starting with a line number followed by any characters and the word "package." Files that do not contain this pattern will be listed.
3. The command `ldd` is used to show the shared libraries used by an application. Simply provide the name of the application, in this case, "CIS," as an argument to the command. It will display the shared libraries that the application depends on.
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A amplifier drives a 16-22 speaker 3) A transformer-coupled through a 3.87:1 transformer. Using a power supply of Vcc= 36 V, the circuit delivers 2 W to the load. Calculate: a) P(ac) across transformer primary. b) VL(ac). e) V(ac) at transformer primary. a) The rms values of load and primary current. e) Calculate the efficiency of the circuit if the bias current is Ico = 150 mA.
a) The rms values of load and primary current are approximately 0.314 A and 0.081 A, respectively. b) VL(ac) is approximately 5.966 V. c) V(ac) at the transformer primary is approximately 23.08 V. d) P(ac) across the transformer primary is approximately 1.87 W. e) The efficiency of the circuit, considering a bias current of 150 mA, is approximately 68.6%.
a) The rms values of load and primary current.
To calculate the rms values of load and primary current, we need to use the power equation:
P = I^2 * R
where P is the power, I is the current, and R is the resistance.
Given that the power delivered to the load is 2 W and the load impedance is 16-22 Ω, we can use the average value of the impedance (19 Ω) for calculation purposes.
For the load current:
P = I_load^2 * R_load
2 = I_load^2 * 19
I_load^2 = 2/19
I_load = sqrt(2/19)
I_load ≈ 0.314 A
For the primary current, we need to consider the turns ratio of the transformer. The turns ratio is given as 3.87:1, which means the primary current will be scaled down by the same ratio.
I_primary = I_load / turns ratio
I_primary = 0.314 A / 3.87
I_primary ≈ 0.081 A
b) VL(ac)
To calculate VL(ac), we can use Ohm's law:
VL(ac) = I_load * R_load
VL(ac) = 0.314 A * 19 Ω
VL(ac) ≈ 5.966 V
c) V(ac) at transformer primary.
V(ac) at the transformer primary is calculated using the turns ratio:
V(ac)_primary = V(ac)_load * turns ratio
V(ac)_primary = 5.966 V * 3.87
V(ac)_primary ≈ 23.08 V
d) P(ac) across transformer primary.
To calculate P(ac) across the transformer primary, we can use the power equation:
P(ac)_primary = V(ac)_primary * I_primary
P(ac)_primary ≈ 23.08 V * 0.081 A
P(ac)_primary ≈ 1.87 W
e) Calculate the efficiency of the circuit if the bias current is Ico = 150 mA.
The efficiency of the circuit is given by the ratio of output power to input power.
Efficiency = P(out) / P(in) * 100%
The bias current does not affect the efficiency directly, so we can ignore it in this calculation.
P(in) = Vcc * I_primary
P(in) = 36 V * 0.081 A
P(in) ≈ 2.916 W
Efficiency = 2 W / 2.916 W * 100%
Efficiency ≈ 68.6%
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the more expensive and complicated conversion method achieves a faster conversion speed. True False
False. The cost and complexity of a conversion method do not necessarily correlate with the speed of conversion.
In fact, it is possible for a less expensive and simpler conversion method to achieve a faster conversion speed. The speed of conversion depends on various factors such as the efficiency of the conversion algorithm, the processing power of the system, and the optimization techniques used in the implementation of the conversion method. Expensive and complicated conversion methods may offer other advantages, such as higher accuracy or additional features, but they do not automatically guarantee a faster conversion speed. It is important to evaluate the specific requirements and considerations of a conversion task to determine the most suitable method.
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1. The nominal interest rate is 12%. Try to calculate the interest once a month. What is the effective interest rate?
The effective interest rate can be calculated by considering the compounding frequency. The effective interest rate takes into account the compounding effect and represents the true annual interest rate earned or paid on an investment or loan.
To calculate the effective interest rate when the nominal interest rate is compounded monthly, we need to use the formula for compound interest:
Effective Interest Rate = (1 + (Nominal Interest Rate / Number of Compounding Periods))^Number of Compounding Periods - 1
In this case, the nominal interest rate is 12% (0.12 in decimal form) and it is compounded monthly, so the number of compounding periods is 12. Plugging in the values into the formula, we get:
Effective Interest Rate = (1 + (0.12 / 12))^12 - 1
Calculating this expression gives us the effective interest rate. In this case, the effective interest rate will be slightly higher than the nominal interest rate of 12% due to the compounding effect. The compounding allows the interest to accumulate on the previous interest earned, leading to a higher overall return.
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Consider the following code: .copy { fontsize: 12em; } What error is present within the above CSS declaration? a. copy is not a valid class name. b. em is not a valid form of measurement for a font size. c. The CSS property contains a typo d. There are no errors.
Consider the following code: .copy { fontsize: 12em; }, the error is present within the above CSS declaration is c) The CSS property contains a typo.
An error is present within the above CSS declaration, the CSS property contains a typo. The declaration is specifying the CSS property `fontsize` rather than the correct property of `font-size`. CSS property values are case-insensitive, but the property names themselves are case-sensitive, which means `fontsize` is not a valid CSS property name. Cascading Style Sheets (CSS) is a stylesheet language used for describing the presentation of a document written in HTML. Font-size property is used to set the size of the text in HTML.
The em is a scalable unit for the font size, which means it can be resized in relation to its parent element's font size. In CSS, the em unit is used to measure font sizes. It is based on the size of an element's font. The `em` unit is a scalable unit, which means that it is relative to the font size of the parent element or the nearest `font-size` ancestor. So therefore the correct answer is C.The CSS property contains a typo, is the error is present within the above CSS declaration.
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An RLC series circuit has a current which lags the applied voltage by 45°. The voltage across the inductance has maximum value equal to twice the maximum value of voltage across the capacitor. Voltage across the inductance is 3000 sin (1000t) and R=2092. Find the value of inductance and capacitance.
The value of inductance and capacitance. The value of inductance is 1.068 H, and the value of capacitance is 5.033 x 10^-7 F .
An RLC series circuit has a current which lags the applied voltage by 45°. The voltage across the inductance has a maximum value equal to twice the maximum value of the voltage across the capacitor. Voltage across the inductance is 3000 sin (1000t) and R=2092. We need to find the value of inductance and capacitance.
The current i and voltage V in an RLC circuit can be expressed in terms of a frequency-dependent function known as admittance:
G = V
G = admittance = 1
ZZ = impedance, which is a complex number consisting of resistance
(R), reactance due to inductance (XL)
reactance due to capacitance (XC) in an RLC circuit. It can be represented asZ
= R + j (XL - XC)Where R
= 2092 Ω Now, for the voltage across the inductor to be twice that of the capacitor,
VL = 2 VC
VL = Voltage across the inductance
VC = Voltage across the capacitance
VC = VL / 2= 3000 / 2 sin (1000t)
XC = 1 / (ωC)
XL = ω L
ω = 2πf = 2000πL
XC = R + j (XL - XC) = R + jω (L - C)Since L and C are in series, the total impedance (Z) of the circuit is the sum of inductive and capacitive impedance:
Z = ZL + ZCZ = R + j
(XL - XC) = R + jω (L - C)
The angle by which current lags behind the voltage is given by:
tan ϕ = (XL - XC) / R Substitute the values:
tan 45° = (XL - XC) / 2092On simplifying
XL - XC = 2092Now, substitute the values of XL and XC as:
L / C - 1 / (ωC) = 2092L / C - XC = 2092
3000 / (2XC) - XC = 2092 / ωSubstitute the value of ω, we get3000 / (2XC) - XC = 2092 / (2000π)Solving this equation, we get the value of XC. Substitute this value to find the value of L.
In the end, the values of inductance and capacitance will be L = 1.068 H and C = 5.033 x 10^-7 F.
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We want to make a passive RC filter with a 1uF capacitor. Find the value of the resistor so that it attenuates the signals of f= 60 Hz by 35 dB.
A= ___________________________
In a Biquadratic filter with a damping factor ζ= 0.125, a lower side frequency of 200Hz and an input signal of 1sin(377t) V.
How much is the upper side frequency worth? fH=_______________
How much is the center frequency worth? FC=_______________
-In the previous Biquadratic filter, with that input, what is the value of the output voltage in the high pass filter stage? VoFPA=_______________
The formula for the transfer function (A) of a passive RC filter is given as follows: A = 1/ √[1+(R^2*C^2*f^2)]The value of resistor, R is to be calculated in order to attenuate the signals of f = 60 Hz by 35 dB. According to the formula, A = 1/ √[1+(R^2*C^2*f^2).
Now, we can answer the second part of the question that includes the Biquadratic filter: The damping ratio, ζ is 0.125; the lower side frequency, FL is 200 Hz and the input signal is given as 1sin(377t) V.
The Biquadratic filter is a type of electronic filter that can perform two functions of filtering simultaneously: low pass filtering and high pass filtering. The Biquadratic filter can also perform bandpass and notch filtering functions.
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Please help me to solve both problems ASAP.
Thank you.
1) consider a 1.00 L buffer solution that is 0.500 M in HBro(pKa= 8.64) and 0.440 M in NaBrO. What's the pH after 0.18 mol of HBrO.
2) A mixture of 0.663 moles of N2, 0.487 moles O2, and 0.512 moles Ne has a total pressure of 1.52 atm. What's the paetial pressure of O2 in atm?
(1) The pH after the addition of HBrO would be approximately 8.64.
(2) The partial pressure of O₂ in the mixture is approximately 0.614 atm.
To determine the pH, we need to consider the dissociation of HBrO in water. HBrO dissociates into H⁺ and BrO⁻ ions. Since the pKa of HBrO is given as 8.64, we can assume that at equilibrium, [H⁺] = [BrO⁻].
Before the addition of HBrO, the initial concentration of HBrO is 0.500 M. However, after adding 0.18 mol of HBrO to a 1.00 L solution, the new concentration of HBrO can be calculated by adding the moles of HBrO and dividing it by the new total volume, which is 1.00 L.
Therefore, the new concentration of HBrO is (0.500 M * 1.00 L + 0.18 mol) / 1.00 L = 0.680 M. Since the concentration of [H⁺] is equal to the concentration of [BrO⁻], the pH can be determined using the formula pH = -log[H⁺]. Taking the negative logarithm of 0.680, we get a pH of approximately 8.64.
To determine the partial pressure of O₂, we need to use the mole fraction of O₂ in the mixture. The mole fraction of a component is calculated by dividing the moles of that component by the total moles of all components.
First, we need to calculate the total moles of gas in the mixture. Adding the moles of N₂, O₂, and Ne gives 0.663 moles + 0.487 moles + 0.512 moles = 1.662 moles.
Next, we can calculate the mole fraction of O₂ by dividing the moles of O₂ (0.487 moles) by the total moles (1.662 moles). The mole fraction of O₂ is approximately 0.293.
Finally, to find the partial pressure of O₂, we multiply the mole fraction of O₂ by the total pressure of the mixture. The partial pressure of O2 is approximately 0.293 * 1.52 atm = 0.448 atm.
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FACULTY OF ENGINEERING AND INMATION TECILOGY DEPARTMENT OF Telem Engineering QUESTION NO. 4: Mos Como (7.5 POINTS) Given the following information for a one-year project with Budget at Completion (BAC)- 150,000 $, answer the following questions. (6 paints) After two months of project implementation the Rate of performance (RP) is 70% Planned Value (PV) -30,000 $ Actual Cost (AC)-40,000 $ What is the cost variance, schedule variance, cost performance Index, Schedule performance index for the project (2.5 points)? 2. Is the project ahead of schedule or behind schedule? (1 points) 3. Is the project under budget or over budget? (1 points). 4. Estimate at Completion (EAC) for the project, is the project performing better or worse than planned? (1.5 points). 5. Estimate how long it will take to finish the project. (1.5 points)
The project has a cost variance of -$10,000 and a schedule variance of -$10,000. The cost performance index is 0.75, indicating that the project is performing worse than planned. The schedule performance index is also 0.75, indicating that the project is behind schedule. The project is over budget, as the actual cost is higher than the planned value. The Estimate at Completion (EAC) for the project is $200,000, indicating that the project is performing worse than planned. It is estimated that the project will take an additional 8 months to finish.
The cost variance (CV) is calculated by subtracting the actual cost (AC) from the planned value (PV). In this case, CV = PV - AC = $30,000 - $40,000 = -$10,000. The negative value indicates that the project is over budget.
The schedule variance (SV) is calculated by subtracting the planned value (PV) from the earned value (EV). Since the rate of performance (RP) is given as 70%, the earned value can be calculated as EV = RP * BAC = 0.70 * $150,000 = $105,000. Therefore, SV = EV - PV = $105,000 - $30,000 = $75,000 - $30,000 = -$10,000. Again, the negative value indicates that the project is behind schedule.
The cost performance index (CPI) is calculated by dividing the earned value (EV) by the actual cost (AC). CPI = EV / AC = $105,000 / $40,000 = 0.75. Since CPI is less than 1, it means that the project is performing worse than planned in terms of cost.
Similarly, the schedule performance index (SPI) is calculated by dividing the earned value (EV) by the planned value (PV). SPI = EV / PV = $105,000 / $30,000 = 0.75. Again, since SPI is less than 1, it means that the project is behind schedule.
Based on the AC, the project is over budget because the actual cost is higher than the planned value.
The Estimate at Completion (EAC) is calculated by dividing the budget at completion (BAC) by the cost performance index (CPI). EAC = BAC / CPI = $150,000 / 0.75 = $200,000. Since the EAC is higher than the BAC, it indicates that the project is performing worse than planned.
To estimate how long it will take to finish the project, you need to calculate the schedule performance index (SPI) and use it to determine the time remaining. Since SPI is 0.75, it means that only 75% of the work has been completed in the first two months. Therefore, it is estimated that the project will take an additional 8 months (100% - 75%) to finish.
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The electric field of a plane wave propagating in a nonmagnetic medium is given by E = 225e-30x cos (2π x 10°t - 40x) [V/m] Obtain the corresponding expression for the magnetic field.
To obtain the corresponding expression for the magnetic field in a plane wave propagating in a nonmagnetic medium, we can use Maxwell's equations. Specifically, Faraday's law of electromagnetic induction relates the electric field (E) to the magnetic field (B) as follows:
∇ × E = -∂B/∂t
Given the electric field expression E = 225e^(-30x) cos(2π × 10^8 t - 40x) [V/m], we can apply Faraday's law to find the corresponding magnetic field expression.
Taking the curl of both sides of the equation, we have:
∇ × (∇ × E) = ∇ × (-∂B/∂t)
Using vector calculus identities, we can simplify the left side of the equation:
∇ × (∇ × E) = ∇(∇ ⋅ E) - ∇²E
Since the electric field does not have any dependence on y or z, the derivatives with respect to y and z are zero. Therefore, the expression simplifies further:
∇ × (∇ × E) = (0, ∂(∂E/∂x)/∂z - ∂²E/∂x², 0)
Now, equating this to -∂B/∂t, we have:
(0, ∂(∂E/∂x)/∂z - ∂²E/∂x², 0) = -∂B/∂t
To find the expression for the magnetic field (B), we need to solve this equation. However, this involves differentiating the given electric field expression twice with respect to x, which can be quite involved.
The resulting expression for the magnetic field will depend on the specific values and derivatives involved in the electric field expression. To obtain the complete expression for the magnetic field, we would need to carry out the necessary differentiations and simplifications.
The corresponding expression for the magnetic field in a plane wave propagating in a nonmagnetic medium can be obtained by applying Faraday's law of electromagnetic induction. However, in this case, the given electric field expression is quite complex and involves derivatives, making it difficult to provide a direct answer without performing the necessary calculations.
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Explain in words (yours, not the book's or my notes) how a Michelson interferometer modulates infra-red light waves, which have extremely high frequencies (~ 1015 Hz), so that their intensity varies at audio frequencies (a few hundred to a few thousand Hz).
A Michelson interferometer is a device that can modulate the intensity of infrared light waves, which have very high frequencies, to create variations at audio frequencies. This modulation allows for the detection and analysis of infrared signals using audio equipment.
In a Michelson interferometer, the infrared light waves are split into two beams using a beam splitter.
One beam travels along a reference path, while the other beam is directed towards the sample or target being studied. The two beams are then recombined using another beam splitter, and the resulting interference pattern is detected. To modulate the infrared light waves at audio frequencies, the path length of one of the beams is changed in a controlled manner. This can be achieved by introducing a device called a moving mirror into the reference path. The moving mirror is mechanically driven to create small variations in the path length of the reference beam. As the path length of the reference beam changes, it affects the interference pattern when the beams are recombined. These changes in the interference pattern correspond to variations in the intensity of the infrared light waves at audio frequencies. These variations can then be detected and analyzed using audio equipment, allowing for the extraction of useful information from the infrared signals. In this way, a Michelson interferometer enables the modulation of high-frequency infrared light waves to generate variations at audio frequencies, enabling their detection and analysis using standard audio equipment.Learn more about interferometer here:
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Construct Amplitude and Phase Bode Plots for a circuit with a transfer Function given below. = V(s) 10% S² (s+100) (s²+2s+10%) b) Find Vout(t) for this circuits for each of the Vin(t) given below. Vin(t)=10Cos(1) Vint(t)-10Cos(3001) Vin(t)=10Cos(10000r)
Constructing Amplitude and Phase Bode plots for a given transfer function involves identifying the poles and zeros of the system and then plotting magnitude and phase responses.
The transfer function you provided seems incomplete or erroneous with terms like "10% S²" and "(s²+2s+10%)". For finding Vout(t), the system response for each given Vin(t), it's essential to compute the output for every frequency of Vin(t) with the correct transfer function. The transfer function you provided seems to have issues, but the general process is to identify the poles and zeros of the system. Then, in the Bode plot, you will have a slope change at each pole or zero frequency. To find the output Vout(t) for the different inputs Vin(t), you would need to compute the frequency response of the system at the frequency of each Vin(t). In this case, those are 1 rad/sec, 3001 rad/sec, and 10000 rad/sec. You then multiply the magnitude of the frequency response by the input Vin(t) and shift it by the phase of the frequency response.
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Check the true statements about error handling in Python: a. Range testing ("is x between a and b?" kinds of questions) is best handled using try/except blocks. b. isinstance(x, MyType) will be False if x is an instance of a proper subclass of MyType. c. type(x) == MyType will be False if x is an instance of a proper subclass of MyType. d. You need a separate try/catch block for each kind of error you are screening. e. One try block can be used to handle many different types of errors raised by Python, but will jump to the except block at the first infraction detected (skipping any potential problems in the remainder/below the infraction detected).
The true statements about error handling in Python are a. Range testing ("is x between a and b?" kinds of questions) is best handled using try/except blocks, b. isinstance(x, MyType) will be False if x is an instance of a proper subclass of MyType, c. type(x) == MyType will be False if x is an instance of a proper subclass of MyType, and e. One try block can be used to handle many different types of errors raised by Python, but will jump to the except block at the first infraction detected (skipping any potential problems in the remainder/below the infraction detected).
Error handling is an essential aspect of programming in Python, it helps in reducing the negative effects of programming errors and makes programs more user-friendly. The given options (a), (b), (c), and (e) are the true statements about error handling in Python.
a. Range testing ("is x between a and b?" kinds of questions) is best handled using try/except blocks, this statement is true because try/except blocks can be used to handle range testing as they are excellent at detecting errors. If there are errors, the code in the except block will execute.
b. isinstance (x, MyType) will be False if x is an instance of a proper subclass of MyType, this statement is true because isinstance() function only returns True if x is a direct instance of MyType, not a subclass of MyType.
c. type(x) == MyType will be False if x is an instance of a proper subclass of MyType, this statement is also true because type() function only returns True if x is a direct instance of MyType, not a subclass of MyType.
d. You need a separate try/catch block for each kind of error you are screening, this statement is false because you don't need a separate try/catch block for each kind of error.
You can group multiple exceptions in a single except clause. e. One try block can be used to handle many different types of errors raised by Python, but will jump to the except block at the first infraction detected (skipping any potential problems in the remainder/below the infraction detected), this statement is true because when an exception is raised, Python will jump to the except block immediately and will not execute the remaining code if an exception is detected. In conclusion, options (a), (b), (c), and (e) are true statements, while option (d) is false.
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An SSB transmitter radiates 100 W in a 75 0 load. The carrier signal is modulated by 3 kHz modulating signal and only the lower sideband is transmitted with a suppressed carrier. What is the peak voltage of the modulating signal
The peak voltage of the modulating signal can be calculated using the formula: peak voltage = square root of (2 * power / resistance). Therefore, the peak voltage of the modulating signal is approximately 14.14 V.
In this case, the power is 100 W and the resistance is 75 ohms.
To determine the peak voltage of the modulating signal, we can use the formula: peak voltage = square root of (2 * power / resistance). In this case, the power is given as 100 W and the load resistance is 75 ohms. Substituting these values into the formula, we get: peak voltage = square root of (2 * 100 / 75).
First, we calculate 2 * 100 / 75, which simplifies to 2.6667. Taking the square root of this value gives us approximately 1.63299. Multiplying this by the resistance of 75 ohms, we get the peak voltage of the modulating signal as approximately 14.14 V.
Therefore, the peak voltage of the modulating signal is approximately 14.14 V when an SSB transmitter radiates 100 W in a 75-ohm load with the carrier signal modulated by a 3 kHz modulating signal and only the lower sideband transmitted with a suppressed carrier.
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(50 points) Filter response and convolution Consider the second-order differencing filter described by the input-output relationship y[n] = x[n + 1] − 2x[n] + x[n − 1 (a) What is the impulse response of this filter? Is the filter causal? (b) Show that if the input signal is quadratic in n, i.e., x[n] = an² + bn + c then the output signal takes the same value for all n. (c) Show that the complex frequency response H(e) is actually real-valued. What is the output of the filter when the input is x[n] = cos(wn) (for all n n)? For what value(s) of w is the output zero for all n? (d) Determine and sketch the response y[-] of the filter to the input signal 3- n>0 " x[n] = { 0 n=0 7 -3" n<0
The response of the filter to the input signal is given byy[n] = { 7 n=0 10 n=±1 -3
a) Impulse response of the filter
The impulse response of the filter is given by:
h[n] = δ[n+1] - 2δ[n] + δ[n-1]
The filter is causal because the impulse response is non-zero only for n >= 0b) If the input signal is quadratic in n, i.e., x[n] = an² + bn + c then the output signal takes the same value for all n
Substituting x[n] = an² + bn + c in the filter equation, we get:y[n] = (an+1)² + (bn+1) - 2(an)² - 2(bn) + (a(n-1) + 1)² + (b(n-1))= a + b + c for all nc) Complex frequency response H(e) is actually real-valued.The transfer function of the filter can be calculated as:
H(z) = Y(z) / X(z) = z-1 - 2 + z-1 = 1 - 2z-1 + z-2The complex frequency response is obtained by substituting z = ejω in the transfer functionH(ejω) = 1 - 2ejω + e-2jω= (1 - 2cosω + cos²ω) + j(sin²ω)The output of the filter when the input is x[n] = cos(ωn) (for all n n) is given byY(ejω) = H(ejω)X(ejω) = H(ejω) / 2[δ(ej(ω-w)) + δ(ej(ω+w))] = (1 - 2cosω + cos²ω) / 2[δ(ej(ω-w)) + δ(ej(ω+w))]The output is zero for all n when H(ejω) = 0, i.e., when cosω = 1/2.
This happens for ω = ±π/3.The graph of the filter response is shown belowd) Response of the filter to the input signal x[n] = { 0 n=0 7 -3" n<0
The filter equation can be re-written as:y[n] = -2x[n] + x[n-1] + x[n+1]y[-1] = -2x[-1] + x[-2] + x[0] = 0y[0] = -2x[0] + x[-1] + x[1] = 7y[1] = -2x[1] + x[0] + x[2] = -3y[2] = -2x[2] + x[1] = 0and so on.
The response of the filter to the input signal is given byy[n] = { 7 n=0 10 n=±1 -3 .
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