Separate streams of steam and air flow through the turbine and heat exchanger arrangement shown in the figure below, where mass flow rate m5 is 2000 kg/min and power output Wt1 is 12,000 kW. Steady-state operating data are provided on the figure. Heat transfer with the surroundings can be neglected, as can all kinetic and potential energy effects. Determine: (a) T3, in K. K (b) the power output of the second turbine, in kW.
Answers
a. h3 = 3645.6kJ/kg
b. W_T2 = 16,213 kW
What is Engineering Thermodynamics?Engineering Thermodynamics is a branch of physics that studies the relationship between heat, work, and energy in engineering systems.
It deals with the principles and laws governing the behavior of energy and its transformation from one form to another, as well as the effects of heat and work on a system.
It provides the foundation for the design, analysis, and optimization of energy conversion and utilization systems, such as engines, power plants, refrigeration systems, and heat exchangers.
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Related Questions
A 75-hp motor that has an efficiency of 91.0% is worn-out and is replaced by a motor that has a high efficiency 75-hp motor that has an efficiency of 95.4%. Determine the reduction in heat gain in the room due to higher efficiency under full-load conditions (load factor
Answers
Answer:
the reduction in the heat gain is 2.8358 kW
Given that;
Shaft outpower of a motor = 75 hp = ( 75 × 746 ) = 55950 W
Efficiency of motor = 91.0% = 0.91
High Efficiency of the motor = 95.4% = 0.954
now, we know that, efficiency of motor is defined as; = /
where is the electric input given to the motor
so
= /
we substitute
= 55950 W / 0.91
= 61483.5 W
= 61.4835 kW
now, the electric input given to the motor due to increased efficiency will be;
= /
we substitute
= 55950 W / 0.954
= 58647.79 W
= 58.6477 kW
so the reduction of the heat gain of the room due to higher efficiency will be;
Q = -
we substitute
Q = 61.4835 kW - 58.6477 kW
Q = 2.8358 kW
Therefore, the reduction in the heat gain is 2.8358 kW
Explanation: i hope this answer your question if this is wrong or correct please let me know.also no trying to be rude but can you sent me like a thanks?
what input signal of the 74192/74193 up/down counter can clear the counter to 0? group of answer choices
Answers
The 74192/74193 up/down counter can be cleared to 0 by applying a clear signal to the appropriate input pin.
In the 74192, the clear signal is applied to pin 1 (Clear), and in the 74193, the clear signal is applied to pin 15 (Clear). When the clear input is activated, the counter is reset to 0, regardless of the current count value or direction.
It's worth noting that the specific clear input signal may vary depending on the implementation of the counter circuit. In some designs, the clear input may be active low (i.e., a logic 0 clears the counter), while in others it may be active high (i.e., a logic 1 clears the counter). It's important to refer to the specific datasheet for the device being used to determine the correct clear input signal.
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What are the benefits of using the engineering design process
Answers
Answer:
Some of the benefits are tangible for they are visible in the design and production process, while the other benefits are intangible which may not be visible directly but result in improvement in the quality of product, better control over designing and production process, reduction of stress on the designers etc.
5. 48 find the fourier transform of the following signals with a = 2, ω0 = 5 rad/s, α = 0. 5 s−1, and φ0 = π/5. (a) f (t) = a cos(ω0t − φ0), −[infinity]
Answers
The Fourier transform of the following signals are: FT{x(t)}: X(ω) = πA[δ(ω - ω0) + δ(ω + ω0)] * (1/2)e^(jφ0) + (1/2)e^(-jφ0)
How to solveGiven A = 2, ω0 = 5 rad/s, α = 0.5 s^(-1), and φ0 = π/5, let's find the Fourier Transform (FT) of the following signals:
x(t) = Acos(ω0t + φ0)
x(t) = Ae^(-αt)cos(ω0t + φ0)
FT{x(t)}:
X(ω) = πA[δ(ω - ω0) + δ(ω + ω0)] * (1/2)e^(jφ0) + (1/2)e^(-jφ0)
X(ω) = A/[(α + j(ω - ω0)) * (α - j(ω + ω0))] * (1/2)e^(jφ0) + (1/2)e^(-jφ0)
These are the Fourier Transforms of the given signals .
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Which personal protective equipment (PPE) should you wear when working around asbestos-containing materials?
A) Respiratory protectionB) Protective work clothing, including gloves C) Face shields and/or vented goggles D) All of the above
Answers
Answer:
d
Explanation:
yea
Answer:
D
Explanation:
A beaker is filled to the 500 ml mark with alcohol. What increase in volume (in ml) the beaker contain when the temperature changes from 5°C to 30°C? (Neglect the expansion of the beaker, evaporation of alcohol and absorption of water vapor by alcohol.) C°, Palcohol = 1.12 x 104/ °C
Answers
Answer:
1.4 mL
Explanation:
Given that:
volume of alcohol \(V_0\) = 500
Temperature change ΔT = (30° - 5°)C
=25° C
\(\beta_{ alcohol }= 1.12 \times 10^{-4} / ^0C\)
The increase in volume ΔV = \(\alpha \times V_o \times \Delta T\)
\(= 500 \times 1.12 \times 10^{-4} / ^0 C\times 25^0 C\)
= 1.4 mL
A square plate of titanium is 12cm along the top, 12cm on the right side, and 5mm thick. A normal tensile force of 15kN is applied to the top side of the plate. A normal tensile force of 20kN is applied to the right side of the plate. The elastic modulus, E, is 115 GPa for titanium.If the left and bottom edges of the plate are fixed, calculate the normal strain and elongation of both the TOP and RIGHT side of the plate.
Answers
Answer:
\(X_t=2.17391304*10^{-4}\)
\(X_r=2.89855072*10^{-4}\)
\(e_t=0.0026\)
\(e_r=0.0035\)
Explanation:
From the question we are told that:
Dimension \(12*12\)
Thickness \(l_t=5mm=5*10^-3\)
Normal tensile force on top side \(F_t= 15kN\)
Normal tensile force on right side \(F_r= 20kN\)
Elastic modulus, \(E=115Gpap=>115*10^9\)
Generally the equation for Normal Strain X is mathematically given by
\(X=\frac{Force}{Area*E}\)
Therefore
For Top
\(X_t=\frac{Force_t}{Area*E}\)
Where
\(Area=L*B*T\)
\(Area=12*10^{-2}*5*10^{-3}\)
\(Area=6*10^{-4}\)
\(X_t=\frac{15*10^3}{6*10^{-4}*115*10^9}\)
\(X_t=2.17391304*10^{-4}\)
For Right side\(X_r=\frac{Force_r}{Area*E}\)
Where
Area=L*B*T
\(Area=12*10^{-2}*5*10^{-3}\)
\(Area=6*10^{-4}\)
\(X_r=2.89855072*10^{-4}\)
\(X_r=2.89855072*10^{-4}\)
Generally the equation for elongation is mathematically given by
\(e=strain *12\)
For top
\(e_t=2.17391304*10^{-4}*12\)
\(e_t=0.0026\)
For Right
\(e_r=2.89855072*10^{-4} *12\)
\(e_r=0.0035\)
The air conditioner in a house or a car has a cooler that brings atmospheric air from 30C to 10C, with both states at 101KPa. If the flow rate is 0.75kg/s, find the rate of heat transfer using constant specific heat of 1.004kj/kg.K
Answers
The rate of heat transfer by the air conditioner using constant specific heat of 1.004kj/kg.K is 15.06 kW.
What is the rate of heat transfer?Rate of heat transfer is the power rating of the machine.
Work done and changes in potential and kinetic energy are neglected since it is a steady state process.
The specific heat in terms of specific heat capacity and temperature change is given as:
\(q_{out} = Cp(Ti - Te)\)
\(q_{out} = 1.004(30 - 10) = 20.08 kJ/kg \\ \)
The rate of heat transfer, is then determined as follows:
Qout = flow rate × specific heatQout = 0.75 × 20.08 = 15.06 kW
Therefore, the rate of heat transfer by the air conditioner is 15.06 kW.
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Compound a undergoes a reversible isomerization reaction a <=> b, over a supported metal catalyst. under pertinent conditions, a and b are liquid, miscible, and nearly identical density; the equilibrium constant for the reaction (in concentrations units) is 5.8. in a fixed bed isothermal flow reactor in which backmixing is negligible (i.e. plug flow), a feed of pure a undergoes a net conversion of b of 55%. the reaction is elementary. if a second identical flow reactor at the same temperature is placed downstream from the first, what overall conversion of a would you expect if:
a. the reactor are directly connected in series?
b. the products from the first reactor are separated by appropriate processing and only the unconverted a is fed to the second reactor?
Answers
A) The overall conversion of A is 71% when connected in series. B) the overall conversion of A is 20.25%.
a. If the two identical flow reactors are directly connected in series, the overall conversion of A can be calculated by using the formula for a reversible first-order reaction in a plug flow reactor:
X = 1 - (1 - X1)(1 - X2)
where X is the overall conversion of A, X1 is the conversion of A in the first reactor, and X2 is the conversion of A in the second reactor.
Since the reaction is reversible, the conversion of B in the first reactor can be calculated as 1 - X1 = 0.45.
Using the equilibrium constant K = 5.8, the concentration ratio of B to A at equilibrium can be calculated as [B]/[A] = K/(1 + K) = 0.85.
Therefore, the concentration of A in the outlet stream of the first reactor can be calculated as CA1 = CA0(1 - X1) = 0.55 CA0, and the concentration of B can be calculated as CB1 = CA0(0.45 + 0.85X1) = 0.9025 CA0.
In the second reactor, the concentration of A in the inlet stream is CA2 = CB1 = 0.9025 CA0, and the equilibrium concentration of B to A is still 0.85.
Therefore, the conversion of A in the second reactor can be calculated as X2 = (CA2 - 0.85CA0)/(0.15CA0) = 0.47. Substituting these values into the formula for overall conversion, we get:
X = 1 - (1 - 0.45)(1 - 0.47) = 0.71
Therefore, the overall conversion of A is 71%.
b. If the products from the first reactor are separated by appropriate processing and only the unconverted A is fed to the second reactor, the overall conversion of A can be calculated as the product of the conversion in each reactor:
X = X1 X2 = 0.45 x 0.45 = 0.2025
Therefore, the overall conversion of A is 20.25%.
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a highway produces SPL of 64 dB at a distance of 250 ft from the highway, determine the SPL at the following distances from the highway:
A) 150 ft under hard surface condition
B) 500 ft under soft surface condition
c) 1500 ft under soft surface condition
Answers
Using the Inverse Square Law, the SPL at 150 ft under hard surface condition is 58.57 dB, at 500 ft under soft surface condition is 61.98 dB, and at 1500 ft under soft surface condition is 51.02 dB.
Given:
Distance of the highway (r) = 250 ft
Sound Pressure Level (SPL) at distance r (L1) = 64 dB
Sound Pressure Level follows the Inverse Square Law. According to this law, the SPL decreases by 6 dB when the distance is doubled, and it increases by 6 dB when the distance is halved.
Mathematically, it can be written as,L1/L2 = (r2/r1)² Where,
L1 is the SPL at distance r1 and L2 is the SPL at distance r2.Substituting the given values and solving, we get the following:
For A) 150 ft under hard surface condition: L2 = L1 - 20 log(r2/r1) dB where
r1 = 250 ft, r2 = 150 ftL2 = 64 - 20 log(150/250) = 58.57 dBFor B) 500 ft under soft surface condition: L2 = L1 - 20 log(r2/r1) dB where
r1 = 250 ft, r2 = 500 ftL2 = 64 + 20 log(250/500) = 61.98 dBFor c) 1500 ft under soft surface condition: L2 = L1 - 20 log(r2/r1) dB where
r1 = 250 ft, r2 = 1500 ftL2 = 64 + 20 log(250/1500) = 51.02 dBHence, the SPL at distances 150 ft under hard surface condition, 500 ft under soft surface condition, and 1500 ft under soft surface condition are 58.57 dB, 61.98 dB, and 51.02 dB, respectively.
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which of the following descriptions apply to standard-type motorcycles? a. are best for long-distance touring b. a lot of performance-oriented bodywork c. straight-up seating position d. designed solely for off-highway use
Answers
The correct response is c. straight-up seating position. Standard-type motorcycles apply to straight-up seating position.
Keeping the feet flat while seated or placing them on the ground or a footrest. Do not cross your ankles or knees. keeping a modest distance between the chair and the back of the knees. putting the knees at the same height as the hips or just a little lower. Sit upright with your shoulders back and your back straight. When sitting, try to leave two inches between the back of your knees and the edge of the seat. Puleio advises adjusting your seat so that your thighs are parallel to the floor and your feet are flat on the ground (or on a footrest if your feet cannot rest comfortably).
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Design and implementation of Read-only memory (ROM) by using a BJT Transistor and storing phone number for each student and the configuration to store it, for example, 8242. And then display it on 7-segment.
firstly draw the circuit of it on ltspice
Do simulation due ltspice
If you press on switch 1, the 7-Segments display The Phone number for student 1, also for each switch.
If you press on switch 2, the 7-Segments display The Phone number for student 2, also for each switch.
If you press on switch 3, the 7-Segments display The Phone number for student 3, also for each switch.
If you press on switch 4, the 7-Segments display The Phone number for student 4, also for each switch.
Answers
The design and implementation of a Read-only memory (ROM) using a BJT Transistor in LTspice allows for storing and displaying phone numbers for each student on a 7-segment display based on switch inputs.
Transistor to store phone numbers for each student and displaying them on a 7-segment display can be achieved through the following steps:
Step 1: Circuit Design
To begin, we need to design the circuit using a BJT Transistor and a 7-segment display. The ROM circuit will consist of multiple switches, each connected to a specific phone number for a student. When a switch is pressed, the corresponding phone number will be displayed on the 7-segment display.
Step 2: Implementation in LTspice
Once the circuit design is finalized, we can proceed with the implementation in LTspice. LTspice is a widely used circuit simulation software that allows us to test and verify the functionality of our circuit before actual implementation.
Step 3: Simulating the Circuit
Using LTspice, we can simulate the circuit and observe the desired behavior. By pressing each switch, we can check if the corresponding phone number is displayed correctly on the 7-segment display. This step ensures that the ROM is functioning as intended.
By following these steps, we can design, simulate, and test the implementation of a ROM using a BJT Transistor to store phone numbers for each student and display them on a 7-segment display.
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what is the irregular past tense of hear?
Answers
Answer:
Past tense of hear = heard
if the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is group of answer choices low oil supply. broken or weak pressure relief valve spring. air lock in the scavenge pump intake.
Answers
If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is air lock in the scavenge pump intake.
Oil pressure gauge fluctuation is a common problem for the engine. It can occur due to various reasons such as faulty oil pressure gauge, oil pump failure, improper maintenance of the engine, oil leakage, and much more. But if the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is air lock in the scavenge pump intake.The scavenge pump in the engine is used to remove the oil from the engine's crankcase and delivers it back to the oil tank. If there is an air lock in the scavenge pump intake, then it will not pump the oil properly from the crankcase and deliver it back to the oil tank. It will cause the oil pressure to fluctuate over a wide range from zero to normal operating pressure.To fix this issue, you should first check the oil level in the engine and make sure that it is at the proper level. After that, you can check the scavenge pump intake for any air lock or blockage. If there is an air lock, then you need to remove it. If there is a blockage, then you need to remove the blockage to get the oil pump working again properly.
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need urgent help!!
Determine the point(s) P on the line e with equation x−6 = ( y−3)/4 = ( 1−z)/3
for which the line connecting P with Q(2, −6, 5) is perpendicular to e.
Answers
The quartiles divide a set of observations into four portions, each representing 25% of the observations, together with the minimum and maximum values of the data set. The interquartile range, a measurement of variation around the median, is calculated using quartiles.
How are quartiles determined?In order to quartile a set of data with n items (numbers), we choose the n/4th, n/2nd, and n/4th items. Interpolation between the adjacent items is used if indexes n/4, n/2, or 3n/4 are not integers.For instance, the first quartile Q1 of ordered data is the 25th item, the second quartile Q2 is the 50th item, and the third quartile Q3 is the 75th item. The fourth quartile Q4 would be the highest item of data, and the zeroth quartile Q0 would be the minimum item; however, these extreme quartiles are referred to as the minimum and maximum of a set, respectively.Calculation:Statistical file: {2, -6, 5}
Quartile Q1: -6
Quartile Q2: 2
Quartile Q3: 5.
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3 Given an empty stack menultems, what will be the result of the following operations? StackPush(menultems, item Pizza) StackPush(menultems, item Chips) StackPush(menultems, item Nachos) StackPush(menultems, item Tea) print(StackPop(menultems)) A) Теа B Pizza Chips Nachos Tea Pizza (D) Tea Nachos Chips Pizza
Answers
Теа will be the result of the following operations.
The tea set showed that tea was being sipped by people from all social and economic classes. The use of the tea set increased significantly between 1840 and 1900 as a result of people beginning to consume more tea. Tea was previously thought of as a luxury item. Not many people could afford it. But throughout that time, the product's use had grown dramatically. Large-scale tea plantations were created by the British in Sri Lanka and India, which contributed to this. Using Camellia sinensis leaves, either dried or fresh, and hot or boiling water, tea is a fragrant beverage. An evergreen shrub native to East Asia called Camellia sinensis is probably the most famous of all tea plants.
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A fuel cell stack operating at 20 volts at 35 amps is attached to a buck-boost DC/DC converter. . What duty cycle should the converter have is the stack is delivering power to a 24 volt DC bus? Question options: 0.375 0.833 0.454 0.546
Answers
We have a fuel cell stack that is working at 20 volts and 35 amps. This fuel cell stack is connected to a buck-boost DC/DC converter.
Now, we have to calculate what should be the duty cycle of the converter if the fuel cell stack is delivering power to a 24-volt DC bus. First, let's determine the power that the fuel cell stack is providing to the converter:Power provided by the fuel cell = V × I = 20 × 35 = 700 watts.Now we have to calculate the output voltage of the converter. For this, we can use the equation:Vout = Duty cycle × VinHere, Vin is the input voltage which is 20 volts as it is the same as the voltage of the fuel cell stack.
So, Vout = Duty cycle × 20VWe know that the fuel cell stack is connected to a 24 V DC bus. So, the output of the converter should be 24 volts. This gives us the following equation:Duty cycle × 20V = 24VWe can solve this for the duty cycle by dividing both sides by 20:Duty cycle = 24/20 = 1.2We can see that the duty cycle is greater than 1 which is not possible as the duty cycle lies between 0 and 1. Therefore, we need to normalize the duty cycle. We can do this by dividing the output voltage by the input voltage. So the normalized duty cycle is:D = Vout/Vin = 24/20 = 1.2So, the duty cycle should be 1.2 or 120% which is not possible. Therefore, the answer is none of the given options.
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The two parts of a SERVQUAL survey are services liability and manufacturing liability. True or false
Answers
Answer: False
Explanation:The correct two parts of the SERVQUAL survey are as follows: Customer expectations. Customer perception.
.) If the charges attracting each other in the problem above have equal magnitude, what is the magnitude of each charge?
Answers
Answer:
Not seeing any other information, the best answer I can give is 2m.
Explanation:
M = magnitude
You see, if they have an equal charge, and you add them, it'd be 2 * m, or 2m.
A parallel circuit has a resistance of 280 and an inductive reactance of 360 02. What's this circuit's impedance?
Answers
Answer:
540 W
Explanation:
A fruit juice is being heated in an indirect heat exchanger using steam as a heating medium. The product flows through the heat exchanger at a rate of 1000 kg/h and the inlet temperature is 30 oC. Determine the quantity of steam required to heat the product to 100 oC when only latent heat of vaporization (2230.2 kJ/kg) from steam at 110oC is used for heating. The specific heat of the product is 4 kJ/(kg oC).
Answers
Answer:
The appropriate response will be "125.55 kg/hr".
Explanation:
The given values are:
Rate of heat exchanger,
m = 1000 kg/h
Inlet temperature,
T = 30°C
Specific heat,
\(c_p\) = 4 kJ/(kg°C)
Now,
The heat taken by juice from steam will be:
⇒ \(Q=mc_p(\Delta T)\)
On substituting the values, we get
⇒ \(=1000\times 4(100-30)\)
⇒ \(=280000 \ kJ/hr\)
The heat given by the steam to juice will be:
⇒ \(Q=m\times L\)
On substituting the values, we get
⇒ \(=m\times 125.55\)
On equating both the heat values, we get
⇒ \(280000=m\times 2230.2\)
⇒ \(m=\frac{280000}{2230.2}\)
⇒ \(m=125.55 kg/hr\)
name three types of resistors and where it is best applied at.
Answers
Answer:
Fixed, Variable, Linear and Non-Linear Resistors & Applications
Explanation:
3 4/5÷2/5 as a fraction
Answers
Answer:
9 1/2
Explanation:
3 4/5 is 3.8
2/5 is 0.4
divide 3.8 by 0.4 you get 9.5 which is 9 1/2 in a fraction
the research findings of clark and clark’s (1939) doll study played a crucial role in which of the following supreme court decisions?
Answers
The research findings of Clark and Clark's (1939) doll study played a crucial role in Brown v. Board of Education
What is the supreme court decisions?Brown vs Board of Education case, the Supreme Court ruled that segregation in public schools was unconstitutional, meaning it was against the law and not allowed.
This decision led to the integration of schools, allowing students of all races to attend the same schools. The Supreme Court decided that it was against the law to separate students in public schools because of their skin color in the Board of Education case. The Clark doll study showed how segregation affected African American kids, and it was done by two important psychologists named Kenneth and Mamie Clark.
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Technician A says automotive gasoline engines run on the 2 stroke principal. Technician B says Diesel engine hace less compression than a gasoline engine. Who is correct?
Answers
Answer:
both are incorect
Explanation:
2 stroke principal is a mix of gasoline and engine oil a normal gasoline engine does not run on 2 stroke fuel
technician B is also wrong Diesel engines generally generate much higher compersion than gasoline engines
the ""something a person has"" authentication mechanism takes advantage of something inherent in the user that is evaluated using biometrics.
Answers
The given statement is false. The "something a person has" authentication mechanism does not utilize biometrics but instead relies on physical objects or tokens possessed by the user.
The "something a person has" factor in authentication refers to the possession of a physical object that is unique to the individual and can be used to verify their identity. Examples of such objects include smart cards, key fobs, security tokens, or electronic devices like smartphones.
Unlike biometric authentication, which relies on the inherent physical or behavioral characteristics of the user, the "something a person has" approach focuses on the physical possession of an item that can be used for authentication purposes. The user presents or uses the physical object as evidence of their identity, typically by entering a unique code, using a security chip, or generating a one-time password.
This authentication mechanism is often used in combination with other factors such as passwords (something a person knows) or biometrics (something a person is) to create a multi-factor authentication (MFA) system. By combining different factors, MFA provides an additional layer of security to ensure that the person accessing the system or service is indeed the authorized user.
Thus, the correct option is "false".
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As an input signal drives the base voltage in a positive direction, base current will_____ and collector current will _____.
Answers
Answer:
Base current increases and collector current decreases
Explanation:
Base current increases and collector current decreases
The collector current does reduces because electrons that moves from emitter to base and the electrons that moves from collector to base are both cancelled out. Some of these electrons enter from the emitter to the collector because, in a way, the emitter has been heavily döped
An increase in base current also means that there is more bias to the transistor
If Sally has 15 candles and gives Robert 8 and Joe 4, how many candles does Sally have left?
Answers
Answer:
3
Explanation:
15-8-4=3
Producing airplanes is complex that the necessary expertise and resources to manufacture different components are spread across the world, for instance, Boeing has more than 15,000 suppliers in 81 countries.
Select one:
a. International suppliers
b. Fully integrated global supply chain
c. Off shore manufacturing
d. International distribution system
Answers
Answer:
D. International distribution system
Select the correct answer. Which statement best describes a hydrogen fuel cell? A This device uses bioethanol as an additive to power an automobile. B. O C. This device uses photovoltaic cells to capture solar energy and generate electrical energy from it. This device uses fossil fuels to generate heat energy that machines can then convert into mechanical energy. This device converts the chemical energy of hydrogen into electricity through a chemical reaction with oxygen or another oxidizing agent. O D. E. This device converts the kinetic energy of an electric turbine into electricity based on Faraday's law.
Answers
Answer:
Explanation:
The correct answer is "D. This device converts the chemical energy of hydrogen into electricity through a chemical reaction with oxygen or another oxidizing agent."
A talks about bio-ethanol fuel.
B is solar.
C is fossil.
E is electricity generation.
Answer:
Explanation:
ans is:
This device converts the chemical energy of hydrogen into electricity through a chemical reaction with oxygen or another oxidizing agent. O D