13.1: Consider four different cellular systems that share the following characteristics. The frequency bands are 825 to 845 MHz for mobile unit transmission and 870 to 890 MHz for base station transmission. A duplex circuit consists of one 30-kHz channel in each direction. The systems are distinguished by the reuse factor, which is 4, 7, 12, and 19, respectively. a. Suppose that in each of the systems, the cluster of cells (4, 7, 12, 19) is duplicated 16 times. Find the number of simultaneous communications that can be supported by each system. (20MHz / 30kHz) * 16

The correct answer is - 10.6666 channels.

Explanation:

Given:

numbers of clusters duplicated = 16 times

The frequency bands for mobile unit transmission are - 825 to 845 MHz

The frequency bands for base station transmission = 870 to 890 MHz

The required bandwidth for each one-way direction of channels = 30 kHz

Formula:

the number of simultaneous communications that can be supported by each system = /

Solution:

The required bandwidth for each two-way direction of channels = 2 × 30 kHz

then, according to the formula the number of simultaneous communications that can be supported by each system

= /

k_{sys} = 16×40/60

[b_{ch} = (845-825) + (890-870) = 20+20=40)]

= 10.6666.

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).