bluuebunny/crossref_metadata_2025_split huggingface dataset:
Results of mineralogical and geochemical investigations of rocks and ores of productive horizons of sandstone type of Dzhengeldy deposit
Authors: Khalilov A , Akbarova Z , Khoshjanova K , Atabaeva N , Juraev Sh , Juliev M 
Published: August 2022

Abstract
The mineralogical and geochemical study of the productive horizons of the Dzhengeldy site was carried out from 2016 to 2020. It should be noted that each horizon has ore-bearing rocks with similar mineralogical and geochemical characteristics. We studied 2 horizons of the Dzhengeldy site (Maastricht and Lyavlyakan). Below are the results of studying the material composition and geochemical features of rocks and ores from deposits of the productive horizons of the Maastrichtian and Lavlyakan selected for various geochemical subzones: oxidized (oreless, selenium dispersion aureoles, uranium and selenium dispersion aureoles, uranium dispersion aureoles, selenium ores) and unoxidized (selenium dispersion aureoles, uranium and selenium dispersion aureoles, selenium ores, uranium ores, uranium dispersion aureoles, uranium and molybdenum dispersion aureoles, molybdenum dispersion aureoles) parts of zoning. It should be noted that the subzones of uranium-selenium, uranium-molybdenum and molybdenum mineralization localized in the grey part of the section have not been studied due to the lack of samples. The subzone of the uranium-molybdenum dispersion aureoles is represented by only one sample, the subzone of the molybdenum dispersion aureoles is represented by three samples (1 sample from the Lavlyakan horizon, 2 samples from the Maastrichtian horizon).
Methodology improvement of geodetic work on the basis of geoinformation technologies
Authors: Inamov A N , Ibragimov O , Mukhamedayubova Sh 
Published: August 2022

Abstract
In the system of topographic and geodetic works, the introduction of modern technologies based on GPS and GLONASS satellite systems, geoinformation systems, digital and laser-electronic measuring and computing techniques, as well as laser scanning technologies is a modern requirement. Currently, the relevant authorities in the maintenance of state cadastres are working on the creation and formation of a cadastral database. In this research, the results of scientific research on the significant contribution to the development of the Republic by eliminating the inconveniences of geodetic work in mountainous areas of the Republic were given. According to the results, the resulting territorial points were combined according to a scheme (abris) created for use on the ground, and an electronic digital map of the geo-database of the region was formed.
Geoportal visualization of state cadastre objects: (a case study from Uzbekistan)
Authors: Inamov A , Sattorov Sh , Dadabayev A , Narziyev A 
Published: August 2022

Abstract
The Cadastre Agency under the State Tax Committee of the Republic of Uzbekistan (State Geodetic Inspection) is responsible for processing the state cadastre data of geodesy and cartography, which are part of the state cadastres, and visualizing the information in the geodata database. The State Cadastre of Geodesy and Cartography has a total of 115,616 objects in the Republic of Uzbekistan, of which 111,838 are included in the geodata database. Taking into account the transparency of this information and the fact that it is not widely used by young researchers in scientific research. During this research, proposals were developed to visualize the state cadastre of geodesy and cartography in the geoportal. During the research, world experience was studied and considered on the example of the Russian Federation, which was homogeneous in terms of systematization of geodetic and cartographic data. The created and recommended geoportal had sections on zone, column, row and nomenclature, and the zone section had rows 10N, 11N, 12N and 13N. Accordingly, the topographic map of the zones was provided with space and cartographic bases.
Integral indicators of the ecological and biological state of soils in Jizzakh steppe, Uzbekistan
Authors: Makhkamova D , Gafurova L , Nabieva G , Makhammadiev S , Kasimov U , Juliev M 
Published: August 2022

Abstract
In the study of soil fertility, biological factors, especially the microbiological activity of soils, have recently attracted increasing attention. Agronomically important groups of microorganisms that participate in the nitrogen and carbon cycle play an important role in soil fertility. By the number of these organisms, it is possible to indicate the state of the soil and characterize the direction of the processes occurring in it. In this regard, it seemed to us necessary to carry out a quantitative account of the main physiological groups of microorganisms involved in the transformations of nitrogen- and carbon-containing substances. The studied area is included in the semi-desert serozem zone with its characteristic geomorphology, climate and vegetation cover. Agrochemical, agrophysical, physical and chemical properties and the sum of integral indicators of the ecological and biological state of soils, it makes it possible to determine the level of impact of their ecological and genetic properties, as well as natural and environmental factors on soil fertility and land degradation.
Selection of partenogenetic clones for mixing with fine silkworm breeds in the conditions of Uzbekistan
Authors: Daniyarov U , Navruzov S 
Published: August 2022

Abstract
The creation and introduction into production of new breeds and hybrids that meet the needs of the world market and industrial enterprises through the development of selection methods for breeding stations and seed enterprises is of great scientific and practical importance. In this regard, the work of a number of local and international scientists is devoted to the selection and creation of new breeds and hybrids of mulberry silkworm on the basis of leading selection traits. The effectiveness of the artificial parthenogenesis method developed in our laboratory is that the effect applied suppresses the reduction division of egg cells. Also, the parthenogenetic genus immediately receives the same set of chromosomes and genes. However, ♀ clone × ♂ hybrid worms have a high viability, the cocoons are the same in shape and other characteristics, there is no work on the separation of the primary parent breed (parthenoclonus) for hybridization (because it consists of 100% only females), breeding at all stages work is not done (because all parthenoclon females are genetically the same and do not change by generation). It is also possible to obtain all the cocoons of parthenoclon in the extraction of cocoons, as their genetic homogeneity completely eliminates the sorting of cocoons in breeding stations and seed plants.
Influence of phosphorus fertilizers on the yield of soybean varieties in the conditions of Uzbekistan
Authors: Atabayeva Kh N , Yakubov S Sh 
Published: August 2022

AbstractSoybean varieties are being studied in Uzbekistan, and cultivation technologies are being improved and new ones are being created. In this research, the effect of phosphorus fertilizers on soybean varieties was studied in the conditions of meadow-swamp soils of Tashkent region. The field experiments were carried out in 4 rows, the piles were 20 m long, 3.6 m wide, with 6 rows, of which 2 rows were marked in the middle and 4 rows were marked as protective rows at the edges. The results showed that when the norm of nitrogen and potassium-based phosphorus fertilizers was 80 kg, the leaf surface averaged 42.6 thousand m2/ha in the Nafis variety. In the second variant, when the phosphorus content was increased to 40 kg, the leaf surface was found to be 2,000 m2/ha higher. In the Vilana variety, the leaf surface area was 42.4 thousand m2/ha at low phosphorus levels, while the leaf surface was found to be 2.2 thousand m2/ha when the phosphorus level was increased by 40 kg.
Representatives of Lepidoptera groups in the biotecenosis of Uzbekistan and their effective parasite-entomophage types
Authors: Jumaev R , Rustamov A 
Published: August 2022

Abstract
In this article, we traced the development of fauna, bioecology and populations of more than 50 species of the main family Lepidoptera, found in the biocenosis of Uzbekistan. Research has been conducted in agricultural crops, forestry and natural biocenoses, and representatives of the Lepidoptera family have been involved in scientific research on species that cause great economic damage. Trichogrammatidae, Braconidae, Ichneumonidae, Chalcididae, Pteromalidae, and Tachinidae, the main entomophagous species that effectively control the number of members of the Lepidoptera family, have also been identified and systematically analyzed. The representatives of the family Trichogrammatidae, which are effective parasitic entomophagous in the management of the number of representatives of the family Lepidoptera. The study revealed that in the agrobiocenoses of cotton, mung bean, corn and cabbage in Tashkent province, the level of occurrence of three main species of nightshade pests of the family Trichogrammatidae, which are egg parasites of the family Lepidoptera, was determined. This means that the number of nights can be effectively controlled by members of the trichogramma family.
Effectiveness of application of mineral fertilizers in growing food plants in desert pasture conditions of Uzbekistan
Authors: Namozov N , Teshaboev B , Saidova M , Kodirova D , Usmanova M , Tursinbaev M 
Published: August 2022

Abstract
Pastures are the main source of fodder for the desert livestock of the country and can be used all year round. Pasture fodder is the cheapest source of fodder. This research work focused on the effectiveness of the use of mineral fertilizers in the cultivation of forage crops in desert pastures, phenological observations of desert forage plants, the determination of the amount of macronutrients in the vegetative organs of desert forage plants. Based on the results, one of the most effective ways to get high yields from desert forage plants was the use of mineral, local, micro and bacterial fertilizers. Moreover, it was found that preventing the degradation of sandy desert soils and improving fodder production for livestock depended on the planting and care of high-yielding desert forage crops, mainly in desert pastures. In general, the use of agro-technical measures was aimed at preventing the degradation of sandy desert soils and improving natural pastures, ensuring the germination of seeds of various desert forage plants in sandy desert soils, achieving growth and accumulation of high nutrient mass, and using mineral forage plants.
Development factors of the state of the livestock sector in Uzbekistan
Authors: Dosmukhamedova M H 
Published: August 2022

Abstract
In each district of Uzbekistan, 3,000 inter-farm fattening enterprises have been established, and the weight of young cattle has reached 450-550 kilograms. Large quantities of beef were produced. It should be noted that the largest industrial complexes (10,000 heads) have been operating effectively. In this research, the state and development of animal husbandry in Uzbekistan for 1985-2017, issues of selection and breeding of cattle, the use of feed resources, the results of the privatization of livestock facilities and animals were studied. Besides, different fodder crops, including alfalfa (hay), oats, feed peas, barley, maize (for silage and grain), seed for intermediate crops, and soybean, were studied and analyzed in term of structure of arable land (%), arable land (ha), productivity (quintals/ha), gross yield (tons). According to the results, the area of land allocated to livestock farms with 500 head of cattle, including 200 cows (380 conditional cattle), was 115 hectares (0.30 hectares for each conditional cattle). According to the results of the experiment, it was proposed to plant alfalfa in 25% of this fodder area and intermediate and secondary fodder crops in 75%.
Method of estimating fuel combustion efficiency at a boiler house
Authors: Gordin S A , Shamak V A , Berdonosov V D 
Published: August 2022

Abstract
There are various ways to estimate fuel combustion efficiency of a boiler house. Most of these ways are based on complex instrumental measurements and are not always applicable in practice. Batch feeding of fuel into a boiler furnace makes it difficult to accurately determine fuel combustion speed and, correspondingly, the amount of heat released during combustion. The method of estimating fuel combustion efficiency at a boiler house considered here allows to determine actual fuel combustion speed by visual observation.
Modeling the prediction of water and steam quality in a power unit
Authors: Yegoshina O V , Lin Ted Wei , Zvonareva S K 
Published: August 2022

Abstract
In this article, mathematical models based on the material balance equations for the drums of the low and high pressure circuit of the heat recovery boiler are compiled. Investigated impurities: sodium, silica, iron. For the equation for the concentration of iron, the coefficients of the rate of formation and flushing of deposits proposed by the authors are taken into account. The concentrations of impurities obtained according to the developed models in controlled streams were studied: feed and boiler water, saturated steam. The calculation results are compared with industrial data. It was found that the error does not exceed 20%, which confirms the possibility of using the developed mathematical models in cycle chemistry. These algorithms reduce the volume of measured water and steam quality indicators and facilitate the work of operational personnel.
Mathematical modeling of greenhouse-livestock complex heated by solar and bioenergy sources
Authors: Ergashev Sh H , Fayziev T A , Tilavov Yu S , Sattorov B N , Khidirov M M , Mirzayorova S U 
Published: August 2022

Abstract
The article develops a mathematical model of the heat supply system of the greenhouse complex, taking into account the free heat flow in the animals, solar energy, heat energy stored in heat accumulators and developed through the program MATLAB / Simulink. In the development of a mathematical model of the heat supply system of the greenhouse complex, a block diagram of the equation in the program MATLAB / Simulink was developed, without taking into account the change in air density and specific heat capacity with temperature. According to the graphic results obtained for the daily value of solar radiation 500 W/m2, outside air temperature, -6 °C in Karshi, the air temperature inside the greenhouse rises to 22 °C, water tank battery temperature to 13 °C, underground heat accumulator temperature to 17 °C. can be seen. while the amount of total solar radiation was 300 W/m2, this figure was found to be 14 °C, 9 °C, and 12 °C.
Orbital Change of belt for Metal V-belt Type CVT (Continuously Variable Transmission) - Change of pitch angle at strings -
Authors: Oshima Kazuki , Mitsubayashi Seiji , Obunai Kiyotaka , Okubo Kazuya 
Published: August 2022

Abstract
The object of this study is to investigate the orbital change of belt with the increase of the transfer torque, during steady-state belt of rotation using a bench-type CVT testing machine. Acceleration sensors were attached to the V-belt to measure accelerations of each element. The pitch angle of each element at the strings also near the entrances and exit was continuously measured by calculating the 3-axis accelerations during the belt travel. Macroscopic change of pitch angle was almost followed by the geometrical change of the angle during the orbital motion of the belt. However, local change of pitch angle at near the entrance and exit of the pulley was not explained by the angle of the geometric posture movement of elements. The pitch angle of each element was locally increased near the entrance and exit of the driven pulley as the load torque increased, while the opposite tendency was observed near those locations of the driving pulley.
Conversion of Steel Converter Slag into Anion Removing Agent via Alkali Fusion
Authors: Wajima Takaaki 
Published: August 2022

Abstract
Steel converter slag, a by-product of iron- and steel-making plants, was converted into a product containing hydrocalumite-like compound using the alkali fusion method. Most of the crystalline phase in the converter slag was converted into a soluble phase by the fusion method, and could be transformed into a product which included hydrocalumite-type crystals. The ability of the product to remove BO3
−, F−, PO4
3−, AsO2
−, AsO4
3−, SeO3
2− and SeO4
2− from aqueous solution is higher than that of raw slag, especially for BO3
−, AsO2
−, AsO4
3− and SeO3
2−.
High-performance dielectric nano-cavities for near- and mid-infrared frequency applications
Authors: Hoang Thanh Xuan , Chu Hong-Son , García-Vidal Francisco J , Png Ching Eng 
Published: August 2022

Abstract
We present a judicious design approach for optimizing semiconductor nanocavities, starting from single photonic atoms to build photonic molecules functioning as high-performance nanocavities. This design approach is based on exact analytical solutions to the Maxwell equations for collective Mie resonances. Conceptually, we distinguish different concepts of cavity modes including Mie mode, collective Mie mode, photonic-crystal (PC) band-edge mode, and Feshbach-type bound states in the continuum (BIC) mode. Using the design approach, we present a unique structure of nanocavity supporting the Feshbach-type BIC mode, capable of enhancing the emission rate of a dipolar emitter by orders of magnitude. This high-performance nanocavity suppresses radiative loss channels strongly via destructive interference and consequently channels the emission light efficiently into an in-plane bi-directional beam with a divergence angle of 10°. Engineering the geometrical parameters of the nanocavity for near-infrared frequency applications requires a fabrication tolerance of ±5 nm. This high accuracy is challenging for the mass production of devices. The fabrication accuracy can be relaxed greatly for mid-infrared frequency devices. As a showcase, we analyze and optimize the well-known PC L3 defect nanocavity for mid-infrared frequency applications in the framework of Feshbach resonance. We show that the optimal structure of this defect nanocavity requires a fabrication tolerance of ±50 nm. Our nanocavity design approach may be useful for near- and mid-infrared frequency applications.
Dynamical characteristics of the surface plasmon-polariton wave supported by a thin metal film
Authors: Bekshaev A Y , Angelsky O V 
Published: August 2022

AbstractWe study the energy and momentum of the surface plasmon-polariton (SPP) excited in a symmetric three-layer ‘insulator–metal–insulator’ structure, which is known to support the symmetric (S) mode (which, under certain conditions, possesses the negative group velocity) as well as the antisymmetric (AS) mode with always positive energy flow. The electric and magnetic field vectors are calculated via both the phenomenological and the microscopic approach; the latter involves the hydrodynamic model accounting for the quantum statistical effects for the electron gas in metal. Explicit representation for the energy and momentum constituents in the dielectric and in the metal film are obtained, and the wavenumber dependences of the energy and momentum contributions for the whole SPP are analyzed numerically. The various energy and momentum constituents are classified with respect to their origin (‘field’ or ‘material’), and the physical nature (orbital (canonical) and spin (Belinfante) momentum contributions). The pictures characteristic for the S and AS modes are systematically compared. The results can be useful for the studies and applications of the SPP-induced thin-film effects, in particular, for the charge and spin dynamics in thin-film plasmonic systems.
Associations of time-dependent changes in phosphorus levels with cardiovascular diseases in patients undergoing hemodialysis: results from the Japan Dialysis Active Vitamin D (J-DAVID) randomized clinical trial
Authors: Koshi-Ito Eri , Inaguma Daijo , Ishii Haruka , Yuzawa Yukio , Kabata Daijiro , Shintani Ayumi , Inaba Masaaki , Emoto Masanori , Mori Katsuhito , Morioka Tomoaki , Nakatani Shinya , Shoji Tetsuo 
Published: August 2022

ABSTRACT

Background
While the risk of exceeding the standard range of phosphorus levels has been investigated, the impact of the degree of fluctuations has not been investigated.

Methods
Data were derived from the Japan Dialysis Active Vitamin D trial, a 4-year prospective, randomized study involving 976 patients without secondary hyperparathyroidism undergoing hemodialysis in Japan. Laboratory data were collected every 6 months and the primary outcome was the time to the occurrence of cardiovascular events. The effect of time-dependent changes in phosphorus levels was assessed using a time-varying Cox proportional hazards regression model.

Results
The median serum phosphorus levels at baseline and at the final observation were 4.70 mg/dl [interquartile range (IQR) 3.90–5.30] and 5.00 mg/dl (IQR 4.20–5.80), respectively. Over each 6-month period, phosphorus changes ranged from −7.1 to +6.7 mg/dl, with a median value of −0.1 to +0.3 mg/dl. During follow-up, composite cardiovascular events occurred in 103 of 964 patients. Although the P-value for the interaction between serum phosphorus level fluctuations and baseline phosphorus levels was insignificant, the following trends were observed. First, patients with relatively high initial phosphorus levels over a 6-month period showed a trend towards a higher hazard, with greater changes in the phosphorus level over the 6-month period. Second, it was suggested that oral vitamin D receptor activators could contribute to the relationship between fluctuating phosphorus levels and cardiovascular events.

Conclusions
Our results suggest the importance of maintaining stable phosphorus levels, not only in the normal range, but also without fluctuations, in the risk of cardiovascular events among patients without secondary hyperparathyroidism undergoing maintenance hemodialysis.