In this article, the socio-economic life of the Khiva khanate is spoken about and basing on the materials and given information about the plants sowed by the people of Khiva, the ways of land cultivation and techniques of land irrigation by O.O. Shkapsky. 

The article provides information on the morphology and physiology of the spreading vermin locusts, which cause great damage to agrocenoses and pastures in the Southern Aral Sea regions. It also provides a brief overview of the natural pests of harmful locusts spread throughout the area. 

This article describes biological and ecological features of the most common night-time butterflies peculiar to the Ipimorphinae subspecies, caught in the Lower Amu Darya agrocenosis, including time of their flight, the food specialization of butterflies and the number of generations. 

The research based on several years of screening, strains resistant to NaCl and Na2SO4 salts (up to 200 mM) were selected from the cotton rhizosphere, it is identified that the strains of the Pseudomonas and Bacillus strains are classified as Pseudomonas stutzeri SKB-308, Bacillus subtilis SKB-309, and Bacillus megaterium SKB-310, as well as it is identified that under stress conditions (pH -9) they separate Indolyl acetic acid (IAA)19.4 ± 0.79; 20.7 ± 1.01; 17.74 ± 0.85 mg / l respectively, and it is identified that stamps of pseudomonas stutzeri SKB-308 synthesis 1-bromine-2-phthalimidetane compound with strong antagonistic activity against phytopathogens. On the basis of these bio preparations it is developed Zamin-M, as well as data on the effectiveness of this bio preparation on potato cultivation on degraded soils was analyzed. Studies have shown that, under the influence of the bio preparation, potato yield increased by 1.2 t/ha in Agrab variety and by 3.1 t / ha in Tuyimli variety. 

The article investigates obtaining anorthite structural glass-ceramic materials from diabase rocks. According to x-ray data, the main crystalline phase in them is anorthite-like solid solutions. 

In this article, models and solutions for the integration of such educational automated systems as the information library system (ILS) and the antiplagiarism system are examined. Integration of systems is based on the compatibility of databases, if more precisely in the metadata of different information models. At the same time, Cloud technologies are used - data processing technology, in which computer resources are provided to the user of the integrated system as an online service. ILS creates e-library of graduation papers and dissertations on the main server. During the creation of the electronic catalog, the communication format MARC21 is used. The database development is distributed for each department. The subsystem of anti-plagiarism analyzes the full-text database for the similarity of texts (dissertations, diploma works and others). Also it identifies the percentage of coincidence, creates the table of statistical information on the coincidence of tests for each author and division, indicating similar fields. The integrated system was developed and tested at the Tashkent University of Information Technologies to work in the corporate mode of various departments (faculties, departments, TUIT branches). 

n-GaPp-(InSb)1-x(Sn2)x (0  х  0.05) heterostructures were fabricated and their current-voltage characteristics were studied. At low voltages V < 0.5 V the current-voltage characteristic is described by the exponential law: I = I0exp (qV / ckT) with an exponent c = 3.6, and at large voltage from 0.5 to 1.8 V by power laws: I = AVm with different values of coefficient A and exponent m at various voltages. At higher voltages - from 2.10 to 2.48 V a sublinear section is observed, it is described by the law: V = V0exp(Iad / S). The results are explained by the diffusion-drift mechanism of current transport conditions of dielectric relaxation, as well as the effect of injection depletion. 

In this paper, we study the problems of finding minimal tests, testers, and a set of variables that are essential for not everywhere defined functions. Such problems are discrete extremal problems of one class, and in algorithms that implement methods for solving them, at each step, a set of variables of not everywhere defined functions is selected. We prove a theorem on the equivalence of the search problems for minimal tests, testers and a set of variables that are essential for not everywhere defined functions, the problem of finding the maximum upper zero of monotone Boolean functions. 

In logical recognition systems, logical methods are used to construct the recognition algorithms based on discrete analysis and propositional calculus based on it. In the general case, the logical method of recognition provides for the presence of logical connections expressed through a system of Boolean equations, in which the variables are the logical signs of objects or phenomena under recognition.