The total noise power at the input of a radio receiver is the sum of the Additive White Gaussian Noise (AWGN) generated within the receiver referred to its input plus the antenna noise plus the available noise power at the receiver’s input due to the presence of in-band spurious, harmonics and other interferences present in the communication channel. Hence, the in-band spurious components (both in terms of their numbers and amplitudes) at the receiver input will cause a reduction in the input Carrier to Noise Ratio (CNR) of the receiver when the receiver is operating at a certain operating point.  This reduction in input CNR) i.e., the increase in input noise level will cause a reduction in the output signal to noise ratio in an analog receiver and an increase in Bit Error Rate (BER) in a digital receiver.   In this paper, an analytical model has been presented to compute the degradation in receiver’s performance or receiver’s sensitivity (i.e., the increase in input noise level) due to the in-band spurious under different situations.  The model is verified experimentally by measuring the performance degradation of a 720 MHz 8PSK receiver (with a bit rate of 480 Mbps) under the presence of in-band spurious of different amplitudes.  A close comparison between the measured data and the estimated data indicates that the analytical model presented here is good enough to estimate the effect of in-band spurious on a radio receiver.

A computer program has been developed for the design of subsurface drip irrigation system. It could be applied for calculation of small scale fields with an area up to 50 ha. The program includes two main parts: crop water requirements and hydraulic calculations of the system. It has been developed in Graphical User Interface (GUI) in MATLAB and gives opportunity for selecting some parameters from interactive tables such as: agro-physical soil properties, characteristics of the corresponding crop, climatic data. It allows the user of the program to assume and set up a definite value, for example the emitter discharge, plot parameters and etc.  Eight cases of system layout according to the water source layout and the number of plots of the system operation are laid into hydraulic section of the program. It includes the design of lateral, manifold, main line and pump calculations.

According to the trend of preschool education in recent years, teachers' morality and style still need to be improved. To understand the importance of moral education, everything from reality, lead by example, standing in the perspective of young children to look at the problem, must not be mechanically applied, with strong teaching methods to help children master knowledge, to fully love this career, has a strong dedication. Carry out standardized and rational education work, improve personal moral literacy and professional knowledge literacy, and lay a more solid guarantee for serving children