bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of superconducting model dipole magnets beyond 12 T with a combined common-coil configuration
Authors: Wang Chengtao , Wang Yingzhe , Shi Jinrui , Feng Ze , Li Chunyan , Wang Juan , Kang Rui , Li Wei , Feng Ao , Yang Huan , Liu Zhongxiu , Zhou Jin , Chen Xin , Xu Qingjin 
Published: March 2023

Abstract
The superconducting magnet group at IHEP (the Institute of High Energy Physics, Chinese Academy of Sciences, China) has been engaging in the R&D of high field accelerator magnets since 2014 for the pre-study of the next-generation high energy particle accelerators like CEPC-SPPC (Circular Electron Positron Collider-Super Proton Proton Collider), FCC (Future Circular Collider), etc. A superconducting model dipole magnet named LPF1 was first fabricated with NbTi and Nb3Sn in a combined common-coil configuration in 2017 and tested in 2018, a main field of 10.23 T was reached within two 10 mm apertures. The magnet was reassembled with higher pre-stress in 2019 to investigate the influence of the pre-stress loading level on the performance of common-coil dipole magnets. The main field of this upgraded magnet named LPF1-S was increased to 10.71 T within two 12 mm apertures. By improving the key processing technologies in Rutherford cable fabrication, coil winding, Nb3Sn & NbTi splices soldering and coil impregnation, the recently fabricated model dipole magnet named LPF1-U attained a 12.47 T main field in two 14 mm apertures in 2021. To fully take advantage of Nb3Sn and NbTi superconductors in different field regions, LPF1-U was still designed and developed with a combined coil configuration with Nb3Sn for the inner two coils and NbTi for the outer four coils. Additionally, graded coil topology and different coil LSS (length of straight section) settings were adopted in the optimization of LPF1-U layouts. Bladder and key technology was used for the support structure, and fiber optic sensors based on FBG (fiber Bragg grating) were utilized to monitor the stress distribution and variation in the structures and coils through the whole process from magnet assembly to cool-down and excitation. During the performance test, a relatively large number of trainings were carried out and LPF1-U became more stable after the thermal cycle. A peak field of 12.7 T in the coils (12.47 T main field in apertures) corresponds to an operating current of 6865 A and a load line ratio of 90% was finally attained. It is worth mentioning that LPF1-U is the first hybrid—Nb3Sn, NbTi—common coil dipole magnet that has achieved a main field of more than 12 T in two apertures. The design, fabrication and performance analysis of the LPF series dipole magnets are presented in this paper.
One-way acoustic beam splitting in spatial four-waveguide couplers designed by adiabatic passage
Authors: Tang Shuai , Wu Jin-Lei , Lü Cheng , Yao Jiabao , Wang Xiaosai , Song Jie , Jiang Yongyuan 
Published: March 2023

Abstract
In this work, we introduce quantum-mechanical adiabatic passage into the design of spatial acoustic four-waveguide (WG) couplers. Thanks to the agreement in form between the Schrödinger equation in quantum mechanics and the coupled-mode equation of classical wave, the behavior of propagating wave in coupled WGs is capable of mapping to quantum states driven by external fields. By coupling the input and output WGs with a mediator WG in space, an apparent beam splitting is realized and the ratio of intensity can be customized arbitrarily by altering the space-dependent coupling strengths. Moreover, a one-way propagation feature is exhibited in the spatial coupler when an appropriate loss is introduced in the mediator WG owing to the existence of dark state. This work builds a bridge between quantum adiabatic technology and acoustic beam splitter, which may have potential applications in acoustic communication, filtering and detection.
Self-focusing of a q-gaussian laser beam under the influence of an exponential plasma density ramp in plasma
Authors: Butt Anees Akber , Kant Niti , Thakur Vishal 
Published: March 2023

Abstract
The goal of the current manuscript is to investigate how a plasma density ramp affects the ability of a q-Gaussian laser beam (q-GLB) to self-focus in plasma. The laser beam exhibits oscillatory self-focusing and defocusing behaviour with increasing distance of propagation. We used an exponential plasma density ramp to combat this defocusing tendency, allowing the particular laser beam to achieve a minimal spot size and nearly retain it up to several Rayleigh lengths. In addition to that, it has been observed that self-focusing increases with increasing q-values and the laser intensity. However, the lower values of q suggest strong self-focusing. By warily selecting the plasma and laser parameters, the density ramp could play a key role in the self-focusing of q-Gaussian laser. Self-focusing is seen to become stronger as propagation distance increases and the q-parameter affects the behaviour of the beam-width parameter in the plasma as shown.
Towards ordered Si surface nanostructuring: role of an intermittent ion beam irradiation approach
Authors: Rakhi  , Muñoz-García Javier , Cuerno Rodolfo , Sarkar Subhendu 
Published: March 2023

Abstract
The dynamical characteristics of surface nanopatterning using low-energy ion beams remains a central theme within ion beam sputtering. Most previous studies have focused on nanostructure evolution by bombarding surfaces using a continuous ion beam. Here, we study the effect of sputtering from an intermittent ion beam on nanopatterning of a Si surface, using a 900 eV or (mostly) 500 eV Ar+ ion beam at an incident angle of 67°, up to a total fluence of 10 × 1019 ions cm−2. Nanoripples are predominantly found on the irradiated surfaces, alongside a hierarchical triangular morphology at the lower energy condition. Ripple ordering is superior for intermediate values of the sputtering interval used in the intermittent sputtering approach. The area of the triangular structures also depends on the intermittent sputtering time intervals. At larger length scales than the ripple wavelength or the triangular structures, all surfaces display strong height fluctuations with a well-defined roughness exponent. Our results can be rationalized via known properties of the nonlinear regime of evolution for surfaces that become amorphous under irradiation and relax stress via ion-induced viscous flow, as borne out from numerical simulations of a continuum model previously proven to provide a significant description of the present class of experiments.
Effects of light size and intensity on photoconductive effect-based optically-induced dielectrophoresis for three-dimensional manipulation
Authors: Yang Huanzhou , Wang Zuobin 
Published: March 2023

Abstract
This study aims to study the effect of light size and intensity on photoconductive effect-based optically-induced dielectrophoresis (ODEP) for three-dimensional manipulation of cells. HL-7702 cells and SMMC-7721 cells in sucrose solution were manipulated three-dimensionally by ODEP. We found that the ODEP force generated by the three-dimensional non-uniform electric field will form a three-dimensional space, and the positive ODEP force will attract the cells near the space into it. When the number of cells is large, the three-dimensional stacking phenomenon will occur, that is, the three-dimensional assembly of cells. When the size of the light spot is similar to that of the cell, the projector with weak light intensity can only manipulate a single cell, while the laser with higher light intensity can carry out cell three-dimensional assembly. When the light intensity is similar, the larger size of light can produce larger a three-dimensional assembly space. So the cell three-dimensional manipulation by ODEP is achieved only when the photoconductive effect induced by the light pattern reaches the required intensity. The three-dimensional manipulation of cells by ODEP is from plane to stereo, and its realization is related to the light size and the photoconductive layer resistance determined by light intensity. And the three-dimensional space of assembling cells is related to the light size and intensity, and the larger and stronger the light, the larger the space.
The comparison of two-term Boltzmann approximation and Monte-Carlo solutions for e+Ar0 plasma
Authors: Tereshonok Dmitry , Chernyshev Timofey , Abramov Artem G , Ugryumov Aleksandr V 
Published: March 2023

Abstract
In this paper, we examine the energy distribution function of electrons in the case of a very weakly ionized argon plasma at sub-atmospheric pressure and external electric field using Boltzmann kinetic equation. We consider a spatially uniform model because our primary interest is the behavior of the collisional part of the equation. The purpose of the study is to compare two different numerical approaches: a deterministic one (using two-term local non-stationary approximation) and a stochastic approach (using the Monte Carlo method) over a wide range of reduced electric fields. We compare steady-state and time-dependent solutions, isotropic and anisotropic parts of the electron energy distribution function, and reaction constants. The research will also help to identify any limitations and challenges of these methods.
Modern methods of evaluation of metrological indicators of channels for measurement and processing of diagnostic values of traction power supply
Authors: Yakubov M , Sulliev A , Sanbetova A 
Published: March 2023

Abstract
This paper considers the matters of estimating errors in measuring and processing diagnostic values of power facilities of power supply of high-speed railways. An information model of the channel for measuring and processing measuring information has been developed, which makes it possible to analyze measurement errors against the background of disturbing external influences, time sampling and coding, signal comparison devices with settings for the lower and upper boundaries of the zone of normal values, as well as obtaining mathematical expectations, standard deviations and other numerical characteristics defining the regression analysis. Permissible error values of the measured parameters are determined for a given confidence level.
Study on a creation of highly ionized cold plasma at atmospheric pressure in the air
Authors: Balitsky V E , Muzafarov Sh , Kilichov O G , Togaev B K , Ruzikulov Z Z 
Published: March 2023

Abstract
This article analyzes the existing ways of creating cold plasma at atmospheric pressure directly into atmospheric air. Research areas listed turns out to be very valuable from a practical point of view, since allows you to create in the plasma gas enough intense ultraviolet radiation, as well as high concentration of physically and biochemically active particles (metastable atoms and molecules, radicals, ozone and other reactive compounds) relatively small specific energy costs. Further in the article, a theoretical comparative analysis of the processes of ozone electrosynthesis in electric sinusoidal and pulsed electric fields is given. The revealed advantage of pulsed electric fields is confirmed by the results of experimental studies
Simulation of linear asynchronous electric drive of slow-speed mechanisms of agricultural complex
Authors: Yunusov R F , Imomnazarov A B , Sattarov N E , Akbarov D A , Abduganiev A A 
Published: March 2023

Abstract
The agro-industrial complex includes a system of enterprises - the production of means of production for agricultural enterprises and various industries, as well as the sphere of processing, transportation and marketing of raw materials and finished products. The development of rational electric drives corresponding to the drive characteristics of production machines solves the problem of energy and resource saving. The methods are determined by the tasks to be solved in the study of an asynchronous electric drive motor.
Operating indicators in diesels with reduced heat and energy losses
Authors: Ismatov J , Aripdjanov M , Mirzaabdullaev J , Tillahodjaev R , Mirzaev A , Viarshyna H 
Published: March 2023

Abstract
The foregoing explains the experimentally established fact that in a heat-insulated diesel engine, diffusion combustion is of great importance - both in terms of the share of heat release and the duration of combustion. To compensate for the decrease in the efficiency of a thermally insulated diesel engine due to an increase in the duration of combustion, the injection advance is increased. The economic effect achieved in this way by increasing the maximum cylinder pressure cannot be considered due to thermal insulation. For typical compression end temperatures in a thermally insulated diesel engine, diffusion combustion, especially in the near-wall layers, is limited by transfer processes. This fact, in addition to the need to eliminate re-enriched zones in the near-wall layers, urgently requires additional turbulization of the working fluid during mixture formation and combustion in thermally insulated engines. The difficulty in solving this problem lies in the fact that one of the most important turbulence generators is the intake process, and one of the most effective solutions is special intake channels. However, the averaged motion and turbulence in the combustor decay significantly during compression. This process is enhanced in a thermally insulated diesel engine due to an increase in the molecular viscosity of the air. The same applies to the generation of turbulence at the end of compression-beginning of expansion. Thus, turbulization of the charge in the combustion chamber of a thermally insulated diesel engine is an urgent problem.
Study on selection of high yield cherry tomatoes varieties
Authors: Egamberdiyev S Y , Yunusov A S 
Published: March 2023

Abstract
Tomato is one of the main vegetable crops grown in greenhouses. It is grown in winter greenhouses in different autumn-winter, winter-spring, and transient and extended periods. This research aimed at researching high yield cherry tomatoes varieties. In this research, the study of tomato variety was done using “Methodology of state variety testing of agricultural crops”, “Methodology of field experiment” (Dospekhov A.B.), “Methodology of experimental work in vegetable growing and melon growing”, and “Guidelines for breeding varieties and hybrids of tomato for open and protected ground”. It was found that the length of the main stem of the tested hybrids increased from 25 to 104 cm on average 62 days after germination, and it was increased from 37 cm to 220 cm on the 80th day of observation. According to the results of 117 days of the observation, the samples were ranged from 48 cm to 269 cm. The pertinent results showed that a relatively high tasting score, which was 9.8 points, were observed in Honey cascade, 1000 N2 tomato and Balcony Yellow F1.
Description of the status of supply of hums and nutrient elements of desert pasture soils based on geoinformation systems
Authors: Namozov N , Saidova M , Kadyrova D , Rasulov Kh , Tursinbaev M 
Published: March 2023

Abstract
It is vitally important to increase the productivity of the degraded and low-fertility sandy desert soils in the world. In particular, special attention is being paid to the use of modern technologies aimed at quickly and qualitatively identifying the changes occurring in sandy desert soils, eliminating the negative effects of desert soils, and preventing the accelerated degradation processes in pastures through a comprehensive study of soil properties. In this research, GIS software was used to map humus and nutrient elements of desert pasture soils. The results showed that the amount of mobile phosphorus in sandy desert soils fluctuated in the range of 10-40 mg/kg in Nurota district, while in Konimekh district this indicator changed in the range of 17-40 mg/kg.
Septoria (Septoria pistaciae Desm.) pathogen infecting pistachio nuts in Uzbekistan and its biological characteristics
Authors: Nazarova O , Khujaev O , Jumanazarov G 
Published: March 2023

AbstractThis article introduces the results of research on the harmful effects of septoria, a fungal plant pathogen infecting pistachio, on pistachio fruit weight and yield. In recent years, there has been an increase in the negative effects of various diseases on the pistachio crop. Therefore, maintaining their yield and developing modern disease control measures remains one of our main goals. The measures to combat this disease and the effectiveness of the most suitable chemical preparations are presented below.
Planting rate of Sudan grass photosynthetic activity and dependence on the period of harvest
Authors: Mirsharipova G K , Mustafakulov D M 
Published: March 2023

Abstract
Since plants absorb solar energy with the help of their leaves, it is important to create plantations where the leaf area is optimal, which can be achieved by correctly determining the planting rate of crops and ensuring optimal thickness of seedlings. The objective of this research is to determine and justify optimum planting rate, which ensures a high yield of bluegrass in the saline soils of the Syrdarya region. During the research experiment, field experiments were conducted on the basis of “Methodology of State variety testing of agricultural crops” and “Methods of conducting field experiments”. The results showed that the leaf surface increased by 4.6 thousand m2/ha when the planting rate was 25 kg/ha, and it was noted that when the planting rate increased to 30 kg/ha, the leaf surface decreased by 0.7 thousand m2/ha compared to the previous option. Moreover, the total green yield was 65.6 and 2.7 q/ha compared to the yield obtained in the tuber phase.
Study of a mobile electric installation for the destruction of permanent rhizous weeds
Authors: Tashpulatov N T 
Published: March 2023

Abstract
This article presents the results of theoretical and experimental studies on the destruction of perennial rhizomatous weeds using the electric method. The biological features, vegetation, growth and development of weeds humai and pygmy beetle as an object of processing have been studied. The layout of the equipment for the installation for electropulse processing, the procedure for implementing the work process and the results of sexual research are described.
The content of phosphorus forms in calcareous irrigated serozems of the Tashkent region of Uzbekistan
Authors: Bairov A J , Juraev Sh A , Abdurakhmonov N Y , TNuriddinova Kh 
Published: March 2023

Abstract
In most cases, the irrigated soils of Uzbekistan provide low forms of phosphorus assimilated by plants due to their high fixation. Therefore, the bioavailability of P is one of the main factors limiting the yield of crops. The study aimed to identify the transformation of phosphorus in irrigated gray soils under the influence of the type of land use, age of development, and climate (location above sea level). For this purpose, the content of inorganic and organic pools of P was studied according to the Hedley method. The highest Pt values were noted in the soil of the Parkent region, where the amount of precipitation significantly exceeds that in other studied areas, as well as in the winterwheat-repeatedcrops-cotton (WW-RC-C) land use type with long-term use of high P fertilizer rates. In the studied soils, the share of Pi was 89-91%, while the share of Po was 9-11% of Pt. In the accumulation of labile P, in contrast to the accumulation of Pt, the greater availability of atmospheric precipitation and the WW-V type of land use, where the content of labile P. was significantly higher than in other studied soils. The obtained results indicate the need for individual consideration of the control of phosphorus nutrition of plants on soils used in various types of land use, their geographical location (altitude above sea level), and the age of development for agriculture, depending on the phosphate state of soils.
Mathematical processing of the influence of cotton storage conditions on yarn quality indicators
Authors: Ismatova M , Yuldasheva M 
Published: March 2023

Abstract
In this article, the qualitative indicators of yarn obtained from cotton fiber stored in a bundle of small sizes and volume were considered in order to determine its quality by processing the results of a full factorial experiment. Attention was also paid to the time spent on the experiment and the equipment used. Based on this and assuming the presence of a paired influence between the factors, the central compositional rototable planning of the experiment of the second order was adopted. The experimental study was planned to be carried out in two stages. A full-factorial experimental study was carried out on a small-sized spinning machine “Shirley” JSC “Scientific Center Pakhtasanoat” and yarn T-19.5 tex was produced. To determine the physical and mechanical properties of the threads, modern equipment of the testing laboratory “CentexUz” at TITLI was used. The results of a full-factorial experiment on the production of yarn from cotton fibers in a bundle of small sizes or volume are shown in tables 1-5, based on the results of the experiment, regression coefficients were found and equations were drawn up. According to the results, the threads of the 6th variant in terms of indicators were recognized as the best option.
Prospects for the development of fruit and vegetable production
Authors: Beglaev U , Dehkonova N , Rozikov J , Isakhanov M 
Published: March 2023

Abstract
Fruit and vegetable clusters are highly effective in finding and introducing innovations suitable for our regions and climate. This research intends to conduct an econometric analysis of the influence of factors on the productivity of vegetable products and fruit products. In this research, influence of factors on the level of productivity of vegetable products was analyzed. The results showed that the productivity index in 2022 was expected to be 249.8 q/ha, and it is predicted to be 10.5 q/ha or 4.4% more than the indicator in 2021. This increase was influenced by the increase in labor costs and fuel and lubricants consumption forecasts in 2022 was foreseen to increase from 6.8 percent to 12.6 than 2021.
The scientific basis of the implementation of differential incubation periods of mulberry silkworm (Bombyx mori L.) seeds in the harsh continental climate of Central Asia
Authors: Jumaghulov Kh A , Rakhmanova Kh E 
Published: March 2023

Abstract
In many foreign countries where cocooning is developed, new effective scientific-based innovative technologies are being developed for the cultivation of high-quality cocoon raw materials, their preliminary processing and increase of cocoon productivity. It is pivotal to obtain high quality, thin and strong silk fiber from cultivated cocoons. This research was aimed at researching differential incubation periods of mulberry silkworm (Bombyx mori.L.) seeds in the continental climate of Central Asia, particularly in Uzbekistan. During the experiments, the methods of morphological, biological, technological, production and statistical analysis of mulberry silkworms, and the methods of “Agrotechnology for the care of industrial hybrids of mulberry silkworms” were used. According to the results, in comparison with the farm 5, this indicator was 15.2%, and it was found that the amount of non-grade cocoons increased by 14.4-15%, it was increased by 4.3-4.9% on average, compared to the experimental options. Therefore, the period of cocoon maturation depends on the time and method of placing the seeds in the hatchery for revival, agrotechnics of worm feeding and climatic weather conditions.