bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermal conductivity tensor of
γ
and
ɛ
-hexanitrohexaazaisowurtzitane as a function of pressure and temperature
Authors: Perriot Romain , Cawkwell M. J. 
Published: August 2022

Using reverse non-equilibrium molecular dynamics simulations, we have determined the dependences on temperature and pressure of the thermal conductivity tensors for the monoclinic γ and ɛ polymorphs of hexanitrohexaazaisowurtzitane (HNIW or CL20). A recently developed non-reactive force field [X. Bidault and S. Chaudhuri, RSC Adv. 9, 39649–39661 (2019)], designed to study polymorphism and phase transitions in CL20, is employed. The effects of temperature and pressure are investigated between 200 and 500 K and up to 0.5 GPa for γ-CL20 and 2 GPa for ɛ-CL20. In order to obtain the full thermal conductivity tensor, κij, for the monoclinic crystals, four distinct heat propagation directions are used. We find that κij for both polymorphs is more isotropic than for other energetic molecular crystals, including α- and γ-RDX, β-HMX, and PETN, with a maximum difference of 9.8% between orientations observed at 300 K and 0 GPa for γ-CL20 and a maximum difference of 4.8% for ɛ-CL20. The average thermal conductivity, κ̄, of ɛ-CL20 is 6.4% larger than that of γ-CL20 at 300 K and 0 GPa. Analytic linear functions of the inverse temperature and the pressure are provided, which fit the data well and can be used to predict the thermal conductivity of both polymorphs for any orientation, pressure, and temperature in and around the fitting range. Our predictions agree reasonably well with the limited available experimental data, for which the polymorph type is unknown.
A MEMS frequency modulation electrometer based on pre-bias charge mechanism to enhance performance
Authors: Chen Hongyu , Chen Dongyang , Shi Zhan , Huan Ronghua , Xie Jin 
Published: August 2022

Abstract
This paper proposes a prototype of micro-electromechanical frequency modulation electrometers based on pre-bias charge mechanism with a single-anchor circular beam (SACB) resonator. The SACB can overcome the uneven energy distribution in the traditional axial-extended tuning forks structure to weaken the geometric nonlinearity. The charge sensitivity is directly related to the pre-bias charge proven by both theorical and experimental results. With increase of pre-bias charge, the resonator works from the clumsy region to the sensitive region. The SACB electrometer has sensitivity of 5.14 ppm fC−1 under 1.416 pC bias in open-loop measurement and 4.52 ppm fC−1 in closed-loop measurement. Real-time dynamic modulation detection is completed with 0.354 fC step variation. Through the analysis of the noise power spectral density, increasing the pre-bias charge can suppress the noise floor of the resonator. As the bias is increased from 0.708 pC to 1.416 pC, the charge resolution is increased by almost 20 times, and the dynamic range is enlarged by 131%. The pre-bias mechanism can be also used in other resonant sensing applications for improvement of performance.
Upscaling from single- to multi-filament dielectric barrier discharges in pulsed operation
Authors: Höft H , Becker M M , Kettlitz M , Brandenburg R 
Published: August 2022

Abstract
A study on the scalability of discharge characteristics of a single-filament dielectric barrier discharge (DBD) to a spatially one-dimensional multi-filament arrangement driven by the same high-voltage (HV) pulses was performed for a gas mixture of 0.1 vol% O2 in N2 at 1 bar. Both arrangements feature a 1 mm gap with dielectric-covered electrodes featuring two hemispherical alumina caps for the single-filament and two parallel alumina-tubes for the multi-filament arrangement. The DBDs were characterised by electrical measurements (for peak current, energy, and power) accompanied by iCCD and streak imaging to determine the filament number and the discharge development in the gas gap and on the surfaces. It was found that the electrical quantities scale with a constant factor between the single- and multi-filament arrangement, which is expected to be related to the filament number. In the multi-filament arrangement, the pulsed operation leads to filament formation in the entire gap in lateral direction within less than 2 ns. Furthermore, particular breakdown or discharge inception regimes were identified for the multi-filament DBDs. These regimes could be generated at the falling slope of asymmetrical HV pulses featuring e.g. a double-streamer propagation, which was previously reported for single-filament DBDs. Consequently, it was proven that the discharge manipulation by varying the HV pulse widths obtained for single-filament DBDs can also be applied in a one-dimensional multi-filament arrangement, i.e. an upscaling based on the knowledge for single-filament DBDs seems to be generally possible.
X-point and divertor filament dynamics from gas puff imaging on TCV
Authors: Wüthrich C. , Theiler C. , Offeddu N. , Galassi D. , Oliveira D.S. , Duval B.P. , Février O. , Golfinopoulos T. , Han W. , Marmar E. , Terry J.L. , Tsui C.K. , the TCV Team  
Published: August 2022

Abstract
A new gas puff imaging diagnostic has been installed on the TCV tokamak, providing two-dimensional insights into scrape-off-layer (SOL) turbulence dynamics above, at and below the magnetic X-point. A detailed study in L-mode, attached, lower single-null discharges shows that statistical properties have little poloidal variations, while vast differences are present in the 2D behaviour of intermittent filaments. Strongly elongated filaments, just above the X-point and in the divertor far-SOL, show a good consistency in shape and dynamics with field-line tracing from filaments at the outboard midplane, highlighting their connection. In the near-SOL of the outer divertor leg, short-lived, high frequency and more circular (diameter ∼15 sound Larmor radii) filaments are observed. These divertor-localised filaments appear born radially at the position of maximum density and display a radially outward motion with velocity ≈400 m s−1 that is comparable to radial velocities of upstream-connected filaments. Conversely, in these discharges (

B
→

×
∇
B

pointing away from the divertor), these divertor filaments’ poloidal velocities differ strongly from those of upstream-connected filaments. The importance of divertor-localised filaments upon radial transport and profile broadening is explored using filament statistics and in situ kinetic profile measurements along the divertor leg. This suggests that these filaments contribute significantly to electron density profile broadening in the divertor.
Drought propagation in space and time: the role of groundwater flows
Authors: Hellwig J , Liu Y , Stahl K , Hartmann A 
Published: August 2022

Abstract
Droughts cause large economic and social impacts all over the world. During drought, groundwater maintains streamflow and can help to mitigate impacts. It governs how drought propagates through the hydrological cycle. Groundwater flows between topographic catchments may modify groundwater dynamics considerably and also influence groundwater’s drought mitigation potential. In this study, we relate drought propagation times to quantitative estimates of groundwater gains or losses for a global set of catchments. For the majority of catchments there is no link found, however, for 16.5% of both groundwater gaining and groundwater losing catchments groundwater flow processes affect drought propagation. Influences of intercatchment groundwater flows (IGFs) on drought propagation are significantly related to catchment characteristics and abundant in North America, South America and Australia. As IGF mostly slow down drought propagation they may increase the potential of the system to buffer meteorological droughts. Reliable drought forecasting and proactive drought governance will benefit from better understanding major influences on drought propagation including IGFs.
Preservation of the filtration capacity of the formation by increasing the strength of the crust and colmatating ability of the drilling fluid
Authors: Raupov A A , Aminov A M , Igamberdiyeva L Z 
Published: August 2022

Abstract
The insufficient density and low strength of the mudcake does not ensure the complete cessation of drilling fluid penetration into the reservoir capillary volume. At the same time, the penetrating components of the solutions, upon contact with the formation components, lead to clogging of the capillary volume due to physicochemical processes. The experiments were carried out on cores made from carbonate rocks of a similar composition of the productive formation and on artificial cores made from carbonate rocks, 30 mm in diameter and 40 mm long. The initial gas permeability of artificial samples was approximately the same (3.6-3.7 m) According to the results, the high strength of the colmatation barrier created by WC-Y736-A polyethylene powder and the low strength of the bonfire-kenaf and cotton cellulose. The resulting deep clogging of the pores and sufficient strength of the polyethylene colmatation barrier was achieved due to their high degree of swelling and physico-chemical effect of the colmatant with the rock.
Development of a lightweight grouting composition with a moderate expansion effect
Authors: Eshpulatov T P , Aminov A M 
Published: August 2022

Abstract
Typically, oil well cement without additives with a water-cement ratio (WC) of 0.5 at a temperature of 393 K and a pressure of 40 MPa has a shrinkage of up to 0.015% by volume. This is a sufficient value for the formation of a channel between the borehole wall and the outer diameter of the casing string. In this research, Kokdumalak gas and oil field in Uzbekistan was selected as study site. During the experiments, laboratory studies with SAF on the subject of its use for cementing wells as an additive to Portland cement in order to increase the tightness of the cement ring of the production casing, prevent annular gas manifestations during WOC and formation of annular pressure. Comparing the results of physical and mechanical tests of these compositions, it can be noted that the pumpability of the composition containing basalt flour waste was somewhat higher, the end of setting occurs somewhat later (3 hours 50 minutes for 2 composition No. 2 and 4 hours 30 minutes for the composition No. 1).
Development and implementation of technological processes and modes of preparation of cotton fold for extraction of pectin substances
Authors: Muminov N , Odinaev M , Vasiev Kh , Abdirayimov A , Kurambayev M 
Published: August 2022

Abstract
The technology for the production of pectin from apple pomace, beet pulp, sunflower baskets and many other types of vegetable raw materials is briefly described. The quality of the final finished product - pectin, depends not only on physical and chemical processes, but also to a large extent on the quality and method of preparation of pectin-containing raw materials. An important place in the production of pectin is occupied by the processes of preparation of pectin-containing raw materials, hydrolysis-extraction and precipitation of pectin substances, on the correct implementation of which the yield and physicochemical parameters of the target product largely depend. In this regard, the preparation of pectin-containing raw materials, the research and development of technological regimes and processes for preparing the cotton flap, as a new type of raw material, are relevant and of great scientific and practical importance. Based on the research results, a technological line for the production of pectin from cotton flaps was developed. Pilot-industrial production of powdered pectin was mastered at the created experimental production “Buttermilk” of the Chinaz district of the Tashkent province, Uzbekistan. Moreover, 2.6 tons of food pectin were produced from cotton pods and on its basis 72.0 tons of marmalade were made for sale.
Methods of using bentonite powder in cleaning sugar corn stem juice
Authors: Azizov A , Abdurazzoqova M , Abdurazzaqova S 
Published: August 2022

Abstract
Sugar syrups are used by beekeepers as an additional source of food for bees during the off-season (late autumn and early spring). It was found that the scientific and practical results of the scientists of Uzbekistan to solve these problems are insufficient. In order to address these shortcomings to some extent, the research has selected sugar corn juice, which is rich in carbohydrates, various vitamins and micro and macro elements, suitable for the climatic conditions of the Republic. The main task of our research is to develop a method of extracting the juice by processing them, purifying them from various physicochemical compounds and feeding them to bees as sufficient raw material base for the production of different varieties of sugar corn juice selected as the object of research. The purpose of our research is to scientifically substantiate the methods of processing the varieties of sugar corn “Uzbekistan 18”, “Karabosh” and “Oranjevoe-160” to extract the juice from the stem, purify them and use them as food for bees.
Technology of growing Bog blueberry (Vaccinium uliginosum L.) seedlings from green cuttings in Tashkent province, Uzbekistan
Authors: Ch Namozov I , Normuratov I T , Ch Kurbonmurodov A 
Published: August 2022

Abstract
Blueberry (Vaccinium uliginosum L.) is one of the most popular fruit plants in the world consumer market. In North America, cultivars of blueberry are widely used as a valuable food and medicinal plant. Blueberries are widely used in both folk medicine and official medicine. This research was aimed at researching different technology use in growing Bog blueberry seedling using its green cuttings in Tashkent province, Uzbekistan. During the experiments, phenological observations and statistical analysis method Dospekhov were employed to analyze growth Bog blueberry in different treatment options. The results showed that the effect of plant concentration on the diameter of the young plant body was recorded at indolyl butyric acid-80 mg/l and Indolyl butyric acid-100 mg/l at plant concentration. In this variant, too, the effect of the concentration of the growing substance on the body diameter of the plants was positive, and it was found that the Duke variety was in the range of 7.5-7.1 mm and the Patriot variety in the range of 6.5-6.4 mm. The highest rate of total average leaf level of plants (360.8-359.7 cm2) was recorded in plants developed from green cuttings of the Duke variety.
Studying the composition of complex mineral fertilizers and inorganic salts in accordance with international REACH requirements
Authors: Dormeshkin O , Hauryliuk A , Muminov N , Khoshimov B 
Published: August 2022

Abstract
The qualitative and quantitative composition of chemical substances, entering in the complement of products of enterprise such as technical fluoride of aluminum, artificial technical cryolite, waterless sulfite of sodium, NPK-complex fertilizers of brands (10:19:25), (16:16:16), 7:16:31 (B), ammoniated superphosphate, ammophos, and also bulk blending fertilizers, containing ammonia nitrate as the nitrogen component, is defined. Chemical, phase, quantitative and mineralogical composition of products are set and specified, physical, structural-mechanical and physical-chemical properties of products are studied with the use of methods of X-ray analysis, IR spectroscopy, thermal, electronic-microscopic, grain-size, mass spectroscopic analyses and also calculations of balances on separate cations and anions taking into account their charges.
Mulberry silkworm (Bombyx mori L.) hybrids in Uzbek selection and, viability, cocoon productivity, and reproductive indicators in summer and fall seasons
Authors: Umarov Sh , Nasirillaev B , Batirova A 
Published: August 2022

Abstract
The demand for silk products with high metric number (thin) in the world market is growing every year. The main demand of cocoon processing enterprises in China, India, South Korea, Italy, France and Japan, the leading countries producing silk products, is focused on silk yarns of type 3A, 4A, and 5A. Due to the lack of special mulberries for re-worm feeding, summer-fall worm feeding usually begins after the mulberry trees and mulberries, whose seedlings have been cut down for spring worm feeding, have harvested enough leaf produce. Nutritional degradation of the leaves to worms and hot weather together make it difficult for the worms to eat and digest nutrients during repeated feeding, and the worms slow down the synthesis of silk substance in the silk gland. Therefore, in summer and fall, small, silky-thin cocoons are obtained. At the same time, it is important to try and select breeds and hybrids that are resistant to hot weather conditions and create new breeds and hybrids suitable for the summer and fall seasons. This article describes the results of research conducted on the testing of silkworm breeds and hybrids in the conditions of repeated worm feeding and the selection of the required level in terms of productivity characteristics. In separate experiments conducted during the summer and fall seasons of 2016-2018, the worm viability, cocoon productivity, and germination traits of each breed, system, and breeding hybrid were studied comparatively.
Preservation of straw with fodder melons and gourds in the conditions of Uzbekistan
Authors: Nurmatov A , Jabborov SH , Sobirkhonov A , Sharipov O , Karibaeva D 
Published: August 2022

Abstract
The results of the preservation of hay and silage with pumpkin and watermelon are presented, which can be used to feed livestock of all types and ages in the autumn-winter period when harvesting hay and silage for effective use in farms and personal subsidiary plots. Recommended for use as a succulent feed, especially in arid regions. It is recommended to be used in personal, subsidiary, peasant and farm enterprises during the autumn-winter feeding of livestock, as well as in educational processes in the field of animal husbandry. As a result of canning straw with edible watermelons and zucchini, significant changes in their chemical composition were also observed. There was no significant difference in dry matter content in all variants.
Methodology of intangible assets efficiency analysis in agriculture
Authors: Rizaev N , Kadirov S 
Published: August 2022

Abstract
Economic analysis is an interconnected end of the study and research of specific economic phenomena, processes, actions, and results. This analysis is used to identify and evaluate basis factors that have a positive or negative effect on various indicators in the development of method economic processes in agriculture. Using economic analysis, unused reserves were identified to improve production performance. The results of the economic analysis are used in forecasting and long-term planning of economic processes, as well as in the development of programmes and recommendations for future development, useful activities. This article addresses the issues of methodology for the analysis of the effective use of intangible assets. In the analysis of the efficiency of intangible assets, scientific conclusions and practical recommendations are formed, which allow to determine its indicators of profitability, turnover, profitability, and on this basis to make management decisions in agriculture.
Biometrical study of artemia cysts harvested from the Aral Sea in Uzbekistan
Authors: Utemuratova F J , Kim S I , Kamilov B G , Yuldashov M A , Mustafaeva Z A 
Published: August 2022

Abstract
Artemia (Artemia parthenogenetica) has been consistently identified in the plankton of the salinizing Aral Sea since the 1990s and by now it has become dominant in the water body. The objective of the research was to investigate diameter, population and distribution of Artemia cysts in Aral Sea Basin, Uzbekistan. During the study observation, the diameter of untreated and decapsulated cysts and the chorion thickness were determined in samples collected in November 2020 on the eastern and southern shores of the Aral Sea remnant (Uzbekistan). The results showed that in samples from the eastern coast, the sizes of untreated cysts were 210-310 (on average 270.6 + 3.1) µm, the sizes of decapsulated cysts were 160-260 (212.2 + 3.8) µm, the calculated diameter of the chorion was 29.2 µm. In samples from the southern coast, the sizes of untreated cysts were 198-330 (265.3 + 4.09) µm, the sizes of decapsulated cysts were 198-297 (242.8 + 3.37) µm, and the calculated diameter of the chorion was 11.1 µm.
Effective methods of preventing degradation of desert pasture soils of Uzbekistan
Authors: Namozov N , Saidova M , Urmanova M , Burxanova D , Rasulov X , Tursinbayev M 
Published: August 2022

Abstract
Natural desert pastures are the main source of fodder for the livestock of the republic, which allows them to use desert pastures all year round. In this research, effective agro-technical measures used to cultivate promising varieties of desert forage plants suitable for soil-climatic conditions was studied in order to improve the condition and increase the productivity of degraded desert pastures. Predictive methods were employed to development of agro-technical measures aimed at restoring, maintaining, increasing and protecting the fertility of sandy desert soils in improving the condition of desert pastures, and to implement a number of complex measures, such as overcoming the process of soil degradation. According to the results, The results showed that seeds of shrubs and semi-shrubs are sown at a depth of 1.5-2.0 cm, the norm of sowing the seeds of the same crop, salsola orientalis and haloxylon 6-8 kg/ha, male grass 5-6 kg/ha and other desert plants planted in accordance with regulatory documents. Once the seedlings began to germinate, field germination of seeds, number of seedlings and retention dynamics, development of adult plants, and formation of the root system were determined.
Soil salinity assessment research using remote sensing techniques: a special focus on recent research
Authors: Kholdorov Sh , Gopakumar Lakshmi , Katsura K , Jabbarov Z , Jobborov O , Shamsiddinov T , Khakimov A 
Published: August 2022

Abstract
Soil salinity is an important environmental problem affecting arid and semi-arid regions. There are direct measures for measuring soil salinity but the conventional methods of assessing soil salinity through chemical analysis is time consuming. With the development of GIS, remote sensing and its popularization in soil science research, the evaluation of soil salinity has become much easier, with the advantage of getting accurate results without tedious sampling. This research addresses the status of various studies done in the international scenario to assess soil salinity and evaluates them. The evaluation is based on the type of articles, geographical region and funding sources. In general, this study will bring out the advantages of remote sensing as an efficient tool for soil salinity related research in the light of current research compared to the contemporary studies in the same field.
The dependence of the growth of carp yearlings (cyprinus carpio) on the density of planting in cages in the conditions of the Karkidon reservoir of Uzbekistan
Authors: Akromov U K , Ismailkhodjaev K B , Yuldashov M A , Kamilov B G 
Published: August 2022

Abstract
The effect of stocking density on the growth of common carp (Cyprinus carpio) in cages was studied. Common carp yearlings (22 g) from the pond hatchery were stocked at 30, 60, 90 ind./m3 (in triplicate). Fish were fed with “Huvalon siliao” aquafeed (Uzbekistan) (35% protein) with ratio 3% of the fish biomass per day. The growth rates of fish in different variants, both in absolute terms and in relative terms (growth rate, specific growth rate), were the same. Carp yearlings were brought from a pond fish nursery and planted evenly in cages. A week was allo-cated as a period of adaptation of fish to the conditions of cages, during this period they were fed at the rate of 3% of the fish biomass. At the beginning of the experiment (May 10) the fish were planted in 30, 60, 90 yearlings of carp in a cage (in triple repetition), the average individual weight of carp (w1, g) in each of the nine cages was 22 g.