Which of the following statement(s) are true?

Suspension cultures of Panax ginseng plant cells are used to produce ginseng biomass for the health tonic market. The cells are

slavikrds [6]

Solution and Explanation:

When using a larger vessel that still requires heating, temperature control measures can be required to provide the initial heat requirement, as well as provide the necessary chilling capacity.

• If the lowest temperature point is near or below ambient and the reaction is exothermic, or a controlled temperature change from high to low is required, then a bath circulator with refrigeration for small vessels or a larger chiller will be required.

In order to calculate the required heating or cooling capacity to reach the desired temperature, the heat load comprised of the specific internal energy must be determined.

This is the energy associated with a change in temperature of a given mass, where no electrical, mechanical or chemical energy is being added to the system. The final calculations include everything that is being cooled or heated, including the culture medium, the bioreactor, the fluid in the jacket, plumbing lines and temperature control unit.

The heat load calculation

Q = MCΔT

Q = heat load (Kilocalories/Kcal)

M = Mass of the substance that is changing temperature (kg)

C = specific heat of the substance that is changing temperature (calories/gram, /°Kelvin)

ΔT = change in temperature (°C)

Once the desired temperature or temperature range and heat load have been determined, and manipulated to compensate for the desired time frame, you will need to estimate the additional cooling or heating needed to poor heat transfer and heat gained from, or lost to the external environment.

4 0

3 years ago

A standard penetration test has been conducted on a coarse sand at a depth of 16 ft below the ground surface. The blow counts ob

scoray [572]

Solution :

Given :

The number of blows is given as :

0 - 6 inch = 4 blows

6 - 12 inch = 6 blows

12 - 18 inch = 6 blows

The vertical effective stress $=1500 \ lb/ft^2$

$= 71.82 \ kN/m^2$

$\sim 72 \ kN/m^2$

Now,

$N_1=N_0 \left(\frac{350}{\bar{\sigma}+70} \right)$

$N_1 =$ corrected N - value of overburden

$\bar{\sigma}=$ effective stress at level of test

0 - 6 inch, $N_1=4 \left(\frac{350}{72+70} \right)$

= 9.86

6 - 12 inch, $N_1=6 \left(\frac{350}{72+70} \right)$

= 14.8

12 - 18 inch, $N_1=6 \left(\frac{350}{72+70} \right)$

= 14.8

$N_{avg}=\frac{9.86+14.8+14.8}{3}$

= 13.14

= 13

8 0

3 years ago

The calculated value of the thermal conductivity of the carbon nano tube was found as: KCN = 3113 W/m-K, however, the theoretica

Alex_Xolod [135]

Answer:

a) 1,607,973.9 K/W

b)

i) 0.3082 = 30.82%

ii) 0.1821 = 18.21%

iii) 0.1293 = 12.93%

iv) 0.1002 = 10.02%

Explanation:

Value of thermal conductivity ( calculated value ) KCN = 3113 W/m-k

Thermal conductivity ( theoretical value ) K = 4500 W/m-k

Island separation = 5 μm

a) Determine the thermal contact resistance

Resistance due to contact between carbon nano tube and top surfaces can be determined using the relation below

( I / A*K ) + 2Rc = ( l / A*KCN ) ------- ( 1 )

where ; I = 5 * 10^-6 m

A = π * ( 14 * 10^-9 )^2 m^2 = 153.93 * 10^-18 , K = 4500 , KCN = 3113

input values into equation 1 above

hence Rc = 1,607,973.9 K/W

b) Determine fraction of total resistance between heated and sensing

fraction of total resistance ; f1 = $\frac{2 Rc}{I/KA + 2Rc}$

where : Rc = 1607973.9, K = 4500, A = 153.93 * 10^-18 ,

i) for I = 5 * 10^-6 m

fraction = 0.3082 = 30.82%

ii) for I = 10 * 10^-6 m

fraction = 0.1821 = 18.21%

iii) for I = 15 * 10^-6 m

fraction = 0.1293 = 12.93%

iv) for I = 20*10^-6

fraction = 0.1002 = 10.02%

5 0

3 years ago

To properly check voltage in any circuit

Grace [21]

Answer: You must touch the leads of the multimeter to any two points in the circuit. When you do this, the multimeter displays the voltage that exists between the points

Explanation:

3 0

3 years ago

: A drive system using the electric motor is under load as 75Nm with an angular velocity of 100rad/s, then the electric motor is

ahrayia [7]

Answer:unsure about how long.

Explanation:

3 0

3 years ago