Graduation technique for vibration flow device for grain mass moisture control

The article shows that sampling of grain while controlling the moisture content is carried out in accordance with the current recommendations and standards. The mass of a sample should be sufficient to form 10-15 samples with uniformly distributed moisture values with an interval of no more than 3-4% in the measurement range of a vibration-flow moisture meter. Determination of grain moisture is carried out by the thermogravimetric method using a drying oven as a standard in the following sequence. Measurements with a moisture meter are taken at least three times. For the final measurement result, the average value α of the moisture meter readings from a series of successive measurements is taken. The range in a series of measurements should not exceed 0.05α; otherwise the measurements are repeated. The moisture measurement results and the corresponding readings of the device are entered in the appropriate table. When constructing graduation curves, a correlation-regression analysis of the measurement results is carried out, which is as follows. A correlation field is constructed - a graphical representation of the relationship between the moisture values of the material Wi and the readings of the moisture meter αi. If the analysis is performed correctly, the theoretical regression line plotted on the correlation field should be located as close as possible to the experimental measurement points. The basic error of the vibration-flow moisture meter, obtained as a result of the calculation, should not exceed the permissible value. Otherwise, the graduation of the moisture meter is repeated.

Метод компенсации пространственно-корреляционного поля естественных радиопомех в цифровых антенных решетках с нелинейным методом обработки сигналов

Целью работы является обоснование метода компенсации пространственно-корреляционного поля естественных радиопомех декамерового диапазона при проектировании конфигураций цифровых антенных решеток с нелинейным методом обработки сигналов. Направленные свойства и помехоустойчивость рассматриваемых антенных решеток для телекоммуникационных и радиолокационных радиоэлектронных систем в значительной степени зависят от сформированного у антенной решетки пространственно-корреляционного поля радиосигналов и радиопомех декаметрового диапазона, которое синтезируются для заданной частоты и полосы пропускания на основе детерминированной зависимости поля радиосигналов и стохастической имитационная модель синтеза радиопомех. С учетом реальных характеристик пространственно-корреляционного поля естественных радиопомех декаметрового диапазона предложен метод его полной компенсации, основанный на предложенном способе расположения элементов антенной решетки. Использование данного метода позволит повысить направленные свойства и помехоустойчивость цифровых антенных решеток с нелинейным методом обработки сигналов для телекоммуникационных и радиолокационных систем.The aim of the work is to substantiate the method of compensation of the spatial correlation field of natural radio interference of the decamer range in the design of configurations of digital antenna arrays with a nonlinear signal processing method. To properties and noise immunity of the considered antenna arrays for lecommunication and radar electronic systems largely depend on the formed antenna array spatial correlation fields of radio and radio decameter range are synthesized for a given frequency and a bandwidth based on determined based on field radiosignal-fishing and stochastic simulation model of the synthesis of interference. Taking into account the real characteristics of the spatial correlation field of natural radio interference of the decameter range, a method of its full compensation based on the proposed method of arrangement of the antenna array elements is proposed. Using this method.

The nature of Earth's correlation wavefield: late coda of large earthquakes

The seismic correlation wavefield constructed from the stacked cross-correlograms of the late coda of earthquake signals at stations across the globe provides a wealth of observed pulses as a function of inter-station distance. The interval from 3 to 10 h after the onset of major earthquakes is employed for the period range from 15 to 50 s. The observations can be well matched by synthetic seismograms for a radially stratified Earth. Many of the correlation phases have similar time behaviour to those in the regular wavefield, but others have no correspondence. All such correlation phases can be explained by the interaction of arrivals with a common slowness at the each of the stations being correlated. Using a generalized ray description of the seismic wavefield, the time-distance behaviour of these correlation phases arises from differences in accumulated phase on different propagation paths through the Earth. Distinct arrivals emerge from the correlation field when there are many ways in which combinations of seismic phases can arise with the same difference in propagation legs. The constituents of the late coda are dominated by steeply travelling waves, and in consequence features associated with multiple passages through the whole Earth emerge distinctly, such as high-order multiples of PKIKP .

Application of Fractal Theory to Geotechnical Engineering

Fractal theory has been established for more than 20 years. Taking the fractal theory into solving geotechnical engineering problems has been gradually perfected. This paper concludes several common methods within the fractal theory research. Meanwhile, sums up the research results of the predecessors during the correlation field. At last, illustrates the application of fractal theory within the geotechnical engineering problems' research in detail, such as the microstructure fractal of soil, the fractal dimension on the joint surface, the relation between fractal dimension and rock quality coefficient(RQD), fractal damage and fractal fracture, and application of fractal theory(mechanics) to related geotechnical engineering.