mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Running coupling constant at finite chemical potential and magnetic field from holography

According to gauge/gravity duality, we use an Einstein-Maxwell-dilaton (EMD) model to study the running coupling constant at finite chemical potential and magnetic field. First, we calculate the effect of temperature on the running coupling constant and find the results are qualitatively consistent with lattice guage theory. Subsequently, we calculate the effect of chemical potential and magnetic field on running coupling. It is found that the chemical potential and magnetic field both suppress the running coupling constant. However, the effect of the magnetic field is slightly larger than that of chemical potential for a fixed temperature. Compared with the confinement phase, the magnetic field has a large influence on the running coupling in the deconfinement phase.
Symmetrical Independence Tests for Two Random Vectors with Arbitrary Dimensional Graphs

Test of independence between random vectors X and Y is an essential task in statistical inference. One type of testing methods is based on the minimal spanning tree of variables X and Y. The main idea is to generate the minimal spanning tree for one random vector X, and for each edges in minimal spanning tree, the corresponding rank number can be calculated based on another random vector Y. The resulting test statistics are constructed by these rank numbers. However, the existed statistics are not symmetrical tests about the random vectors X and Y such that the power performance from minimal spanning tree of X is not the same as that from minimal spanning tree of Y. In addition, the conclusion from minimal spanning tree of X might conflict with that from minimal spanning tree of Y. In order to solve these problems, we propose several symmetrical independence tests for X and Y. The exact distributions of test statistics are investigated when the sample size is small. Also, we study the asymptotic properties of the statistics. A permutation method is introduced for getting critical values of the statistics. Compared with the existing methods, our proposed methods are more efficient demonstrated by numerical analysis.
Government Investment and High-Quality Economic Development - Measurement and Analysis Based on Input-Output Method

Analysis of how government investment promotes economic development and employment is important for improving government's decision-making and promoting high-quality economic development in western China. In this paper, the authors take Xinjiang as an example to conduct such an analysis. Firstly, based on the competitive input-output table of Xinjiang, the non-competitive input-output tables of 2007, 2012 and 2015 are compiled in this paper. Secondly, the contribution of Xinjiang government investment, especially the major government investment projects, to the valueadded of Xinjiang, other provinces and cities in China and abroad are calculated. Thirdly, this paper uses the non-competitive input-output table to compile the sectoral employment vector, and uses the input-occupancy-output technique to measure how government investment promotes employment. The results show that Xinjiang government investment contributes the most to the value-added of Xinjiang and other provinces and cities, but less to foreign countries; the government investment create the most job opportunities in projects including transportation projects and livelihood projects etc.
A Strategy to Reduce the Peak Temperature of the Chip Working under Dynamic Power Using the Transient Cooling Effect of the Thin-Film Thermoelectric Cooler

The thin-film thermoelectric cooler (TEC) is a promising solid-state heat pump that can remove the high local heat flux of chips utilizing the Peltier effect. When an electric current pulse is applied to the thin-film TEC, the TEC can achieve an instantaneous lower temperature compared to that created by a steady current. In this paper, we developed a novel strategy to reduce the peak temperature of the chip working under dynamic power, thus making the semiconductor chip operate reliably and efficiently. A three-dimensional numerical model was built to study the transient cooling performance of the thin-film TEC on chips. The effects of parameters, such as the current pulse, the heat flux, the thermoelement length, the number of thermoelements, and the contact resistance on the performance of the thin-film TEC, were investigated. The results showed that when a current pulse of 0.6 A was applied to the thin-film TEC before the peak power of the chip, the peak temperature of the chip was reduced by more than 10°C, making the thin-film thermoelectric cooler a promising technology for the temperature control of modern chips with high peak powers.
A Modified Temperature-Vegetation Dryness Index(MTVDI)for Assessment of Surface Soil Moisture Based on MODIS Data

Spatio-temporal dynamic monitoring of soil moisture is highly important to management of agricultural and vegetation ecosystems. The temperature-vegetation dryness index based on the triangle or trapezoid method has been used widely in previous studies. However, most existing studies simply used linear regression to construct empirical models to fit the edges of the feature space. This requires extensive data from a vast study area, and may lead to subjective results. In this study, a Modified Temperature-Vegetation Dryness Index(MTVDI)was used to monitor surface soil moisture status using MODIS(Moderate-resolution Imaging Spectroradiometer)remote sensing data, in which the dry edge conditions were determined at the pixel scale based on surface energy balance. The MTVDI was validated by field measurements at 30 sites for 10 d and compared with the Temperature-Vegetation Dryness Index(TVDI). The results showed that the R~2 for MTVDI and soil moisture obviously improved(0.45 for TVDI, 0.69 for MTVDI). As for spatial changes, MTVDI can also better reflect the actual soil moisture condition than TVDI. As a result, MTVDI can be considered an effective method to monitor the spatio-temporal changes in surface soil moisture on a regional scale.
K_2HPO_4-mediated Photocatalytic H_2 Production over NiCoP/RP Heterojunction

In this work, bimetallic NiCoP nanoparticles(NPs)were firstly prepared by a solvothermal method using red phosphorus(RP)as P source, and it was combined with RP nanosheets via a physical grinding process. Investigation indicates that NiCoP has better charge transfer ability and faster H_2 releasing kinetics than the corresponding single metal phosphides alone. 6 wt% NiCoP/RP exhibits an excellent H_2 evolution activity in 20 vol.% triethanol-amine/water solution under a 300W Xe-lamp irradiation, and the corresponding H_2 production rate is 1535.6 μmol·g~(-1)·h~(-1), which is 7.4, 3.2 and 2.6 times higher than those of pure RP, 6 wt% CO_2P/RP and 6 wt% Ni_2P/RP, respectively. In addition, we demonstrate that K_2HPO_4 can further enhance the H_2 evolution kinetics by inducing a new H~+reduction path, when appropriate K_2HPO_4 is introduced into the reaction solution. The H_2 production rate of 6 wt% NiCoP/RP is boosted from 1535.6 to 2793.9 μmol·g~(-1)·h~(-1) due to the easier combination between H~+and electrons with the assistance of HPO_4~(2-). It is 13.4 times higher than that of pure RP. This work demonstrates that bimetallic phosphides with suitable electrolytes can greatly enhance the photocatalytic H_2 evolution efficiency.
Global Existence of Strong Solutions for the Generalized Navier-Stokes Equations with Damping

This paper mainly focus on the global existence of the strong solutions for the generalized Navier-Stokes equations with damping. We obtain the global existence and uniqueness when α≥ 5/4 for β≥ 1 and when 1/2 + 2/β≤α ≤ 5/4 for 8/3≤β< +∞.
Variance Variation Criterion and Consistency in Estimating the Number of Significant Signals of High-dimensional PCA

In this paper, we propose a criterion based on the variance variation of the sample eigenvalues to correctly estimate the number of significant components in high-dimensional principal component analysis (PCA), and it corresponds to the number of significant eigenvalues of the covariance matrix for p-dimensional variables. Using the random matrix theory, we derive that the consistent properties of the proposed criterion for the situations that the significant eigenvalues tend to infinity, as well as that the bounded significant population eigenvalues. Numerical simulation shows that the probability of estimator is correct by our variance variation criterion converges to 1 is faster than that by criterion of Passemier and Yao [Estimation of the number of spikes, possibly equal, in the high-dimensional case. J. Multivariate Anal., (2014)](PYC), AIC and BIC under the finite fourth moment condition as the dominant population eigenvalues tend to infinity. Moreover, in the case of the maximum eigenvalue bounded, once the gap condition is satisfied, the rate of convergence to 1 is faster than that of PYC and AIC, especially the effect is better than AIC when the sample size is small. It is worth noting that the variance variation criterion significantly improves the accuracy of model selection compared with PYC and AIC when the random variable is a heavy-tailed distribution or finite fourth moment not exists.
A Free-Volume Model for Thermal Expansion of Metallic Glass

Many mechanical,thermal and transport behaviors of polymers and metallic glasses are interpreted by the freevolume model,whereas their applications on thermal expansion behaviors of glasses is rarely seen.Metallic glass has a range of glassy states depending on cooling rate,making their coefficients of thermal expansion vary with the glassy states.Anharmonicity in the interatomic potential is often used to explain different coefficients of thermal expansion in crystalline metals or in different metallic-glass compositions.However,it is unclear how to quantify the change of anharmonicity in the various states of metallic glass of the same composition and to connect it with coefficient of thermal expansion.In the present work,isothermal annealing is applied,and the dimensional changes are measured for La_(62)Al_(14)Cu_(11.7)Ag_(2.3)Ni_5Co_5 and Zr_(52.5)Cu_(17.9)Ni_(14.6)Al_(10)Ti_5 metallic glasses,from which changes in density and the coefficients of thermal expansion of the specimens are both recorded.The coefficients of thermal expansion linearly decrease with densification reflecting the role of free volume in thermal expansion.Free volume is found to have not only volume but also entity with an effective coefficient of thermal expansion similar to that of gases.Therefore,the local regions containing free volume inside the metallic glass are gas-like instead of liquid-like in terms of thermal expansion behaviors.
急性胰腺炎相关血清学指标及评分系统综述

急性胰腺炎(acute pancreatitis,AP)是一种常见的急性胰腺炎症性疾病,大约有15%~25%的AP会发展为重症胰腺炎(severe acute pancreatitis,SAP),由于胰腺和胰腺外坏死的发展、随后的感染和多器官功能障碍,SAP的死亡率在10%~35%,并仍明显升高。因此如何在接诊时及时预测和判断AP的严重程度更有助于识别并发症和死亡风险增加的患者,这对于急诊科医师极为重要,从而尽早将其分诊至监护病房进行精细治疗,并为其选择特定的干预措施。本文将对近些年常用于临床的AP评估指标及评分系统进行综述。
硬皮病肾危象合并自身免疫性多内分泌腺病综合征Ⅱ型1例报告

血液透析是SRC肾功能严重恶化或血压难控制时的重要治疗手段。血浆置换在SRC治疗中的地位尚不明确,通常用于系统性硬皮病合并血栓性微血管病(TMA),也有报道用于混合性结缔组织病并发SRC。该患者由于经费原因未行血浆置换治疗。抗栓治疗对于SRC尚无明确研究,有报道在有胎盘功能不全合并系统性硬皮病的妊娠妇女中有必要使用阿司匹林或小剂量抗凝治疗。针对该患者我们采用了低分子肝素联合氯吡格雷抗栓。硬皮病患者常伴有抑郁状态,需予以早期识别及干预。经过积极治疗,患者神志恢复正常,可进食流质,腹部胀痛明显好转,贫血较前改善;但尿量仍偏少,SCr降至677 μmol/L,血尿酸降至519 μmol/L,准予患者出院并于外院继续维持血液透析治疗。遗憾的是,患者离院后失访,未能获知最终预后。
膝关节软骨损伤修复重建指南(2021)

关节软骨是一种无血管、无神经及淋巴的组织,损伤后自身难以修复。膝关节软骨损伤是运动员和普通人群的多发、难治性关节伤病。一项流行病学调查显示,在膝关节镜手术中,软骨损伤占比高达63%。严重的软骨损伤影响关节功能,运动员甚至因此丧失运动生命。软骨损伤的治疗已经困扰医生患者200余年,至今仍是骨科及运动医学领域的重点课题和重大挑战。
太阳能LED系统在室内环境艺术设计中的应用探讨

化石能源的使用导致全球气候变暖,对人类生存环境造成严重破坏,能源作为社会发展的基础,以可再生绿色能源取代化石能源,调整能源结构已成为世界各国政府关注的重要问题之一。可再生能源的开发和应用可以有效缓解自然资源的过度消耗,同时助力社会经济持续发展。以光伏发电为首的可再生能源在全球得到广泛关注,我国光伏技术发展、推广应用更是领先于其他国家。分布式光伏发电是给用户端提供日常电力供给。对企业发展而言,企业能源管理与成本控制息息相关,采用光伏发电可以有效降低生产成本,因此分布式光伏发电技术应用广泛,如建筑设计、室内环境设计等。LED用于照明具有使用寿命长、效率高的优势,与光伏发电结合可达到环保、高效、节能的目的。
华北地区本溪组首次发现古风化壳沉积金红石型钛矿

2020年以来,山东省自然资源厅针对淄博地区上石炭统本溪组铝质岩系中的关键战略性矿产进行了调查评价。施工钻孔发现金红石、锂、铌钽、镓等关键战略性矿产资源的富集现象,其中,以金红石相钛的富集程度最高,达到工业指标。该矿床类型应为古风化壳沉积型金红石型钛矿,金红石型钛矿在华北地区本溪组的发现属于首次。
胎盘植入子宫次全切除术后盆腔迟发性出血2例

回顾性分析两例胎盘植入孕妇术后盆腔迟发性出血的发生及诊治经过,结合文献探讨胎盘植入的术前评估及围手术期处理经验。两例孕妇均行胎盘植入术前超声评估,考虑为穿透性胎盘植入,术中二次评估后行胎盘在位子宫次全切除术,术后病理证实为胎盘植入。术后2~3d出现腹痛或肉眼血尿,超声检查提示手术区域血肿形成,并伴有血肿内活动性出血。急诊行子宫动脉栓塞术,术后病灶逐渐缩小。胎盘植入于子宫前壁下段,子宫下段与膀胱及腹膜与子宫颈的间隙可能有复杂的新生血管及吻合系统,子宫切除术后,仍有可能出现迟发性出血。胎盘植入术前除了进行严重程度的评估之外,还应重视胎盘局部状态及植入部位解剖学的评估,术后迟发性出血时可应用介入血管栓塞术治疗。
Advanced inorganic/polymer hybrid electrolytes for all-solid-state lithium batteries

Solid-state batteries have become a frontrunner in humankind's pursuit of safe and stable energy storage systems with high energy and power density. Electrolyte materials, currently, seem to be the Achilles' heel of solid-state batteries due to the slow kinetics and poor interfacial wetting. Combining the merits of solid inorganic electrolytes (SIEs) and solid polymer electrolytes (SPEs), inorganic/polymer hybrid electrolytes (IPHEs) integrate improved ionic conductivity, great interfacial compatibility, wide electrochemical stability window, and high mechanical toughness and flexibility in one material, having become a sought-after pathway to high-performance all-solid-state lithium batteries. Herein, we present a comprehensive overview of recent progress in IPHEs, including the awareness of ion migration fundamentals, advanced architectural design for better electrochemical performance, and a perspective on unconquered challenges and potential research directions. This review is expected to provide a guidance for designing IPHEs for next-generation lithium batteries, with special emphasis on developing high-voltage-tolerance polymer electrolytes to enable higher energy density and three-dimensional (3D) continuous ion transport highways to achieve faster charging and discharging.
A finite-element-aided ultrasonic method for measuring central oil-film thickness in a roller-raceway tribo-pair

Roller bearings support heavy loads by riding on an ultra-thin oil film (between the roller and raceway), the thickness of which is critical as it reflects the lubrication performance. Ultrasonic interfacial reflection, which facilitates the non-destructive measurement of oil-film thickness, has been widely studied. However, insufficient spatial resolution around the rolling line contact zone remains a barrier despite the use of miniature piezoelectric transducers. In this study, a finite-element-aided method is utilized to simulate wave propagation through a three-layered structure of roller-oil-raceway under elastohydrodynamic lubrication (EHL) with nonlinear characteristics of the i) deformed curvature of the cylindrical roller and ii) nonuniform distribution of the fluid bulk modulus along the circumference of the oil layer being considered. A load and speed-dependent look-up table is then developed to establish an accurate relationship between the overall reflection coefficient (directly measured by an embedded ultrasonic transducer) and objective variable of the central oil-film thickness. The proposed finite-element-aided method is verified experimentally in a rollerraceway test rig with the ultrasonically measured oil-film thickness corresponding to the values calculated using the EHL theory.
Si-based polymer-derived ceramics for energy conversion and storage

Since the 1960s,a new class of Si-based advanced ceramics called polymer-derived ceramics (PDCs) has been widely reported because of their unique capabilities to produce various ceramic materials (e.g.,ceramic fibers,ceramic matrix composites,foams,films,and coatings) and their versatile applications.Particularly,due to their promising structural and functional properties for energy conversion and storage,the applications of PDCs in these fields have attracted much attention in recent years.This review highlights the recent progress in the PDC field with the focus on energy conversion and storage applications.Firstly,a brief introduction of the Si-based polymer-derived ceramics in terms of synthesis,processing,and microstructure characterization is provided,followed by a summary of PDCs used in energy conversion systems (mainly in gas turbine engines),including fundamentals and material issues,ceramic matrix composites,ceramic fibers,thermal and environmental barrier coatings,as well as high-temperature sensors.Subsequently,applications of PDCs in the field of energy storage are reviewed with a strong focus on anode materials for lithium and sodium ion batteries.The possible applications of the PDCs in Li-S batteries,supercapacitors,and fuel cells are discussed as well.Finally,a summary of the reported applications and perspectives for future research with PDCs are presented.
Corrosion-wear behavior of a biocompatible magnesium matrix composite in simulated body fluid

Magnesium matrix composites are a new generation of biocompatible implant materials,but they will inevitably undergo simultaneous wear and corrosion in the human body.In this study,hydroxyapatite (Ca10(PO_4)6(OH)_2,HA) is used in a magnesium matrix composite to study its effects on the corrosion-wear behavior.Two samples (a magnesium alloy composed of Mg,Zn,and Zr (ZK60) alloy and ZK60/10HA composite) were fabricated using the powder metallurgy (PM) process.Their corrosion-wear behavior was investigated using the sliding wear test in a simulated body fluid (SBF).At all the sliding velocities tested,the corrosion- wear resistance of ZK60/10HA was superior to ZK60.At a sliding velocity of 942.5 mm/min,ZK60/10HA demonstrated a 42% improvement in corrosion-wear resistance compared to ZK60.For ZK60,the main wear mechanism under dry conditions was abrasion,while the wear mechanisms in the SBF were abrasion and corrosion.For ZK60/10HA,the wear mechanisms under dry conditions were abrasion and delamination,while in SBF they were mainly abrasion and corrosion,accompanied by slight delamination.The results indicated that HA particles can be used as an effective corrosion-wear inhibitor in biocompatible magnesium matrix composites.
Sub-synchronous frequency domain-equivalent modeling for wind farms based on rotor equivalent resistance characteristics

The equivalent simplification of large wind farms is essential for evaluating the safety of power systems.However,sub-synchronous oscillations can significantly affect the stability of power systems.Although detailed mathematical models of wind farms can help accurately analyze the oscillation mechanism,the solution process is complicated and may lead to problems such as the "dimensional disaster." Therefore,this paper proposes a sub-synchronous frequency domainequivalent modeling method for wind farms based on the nature of the equivalent resistance of the rotor,in order to analyze sub-synchronous oscillations accurately.To this end,Matlab/Simulink is used to simulate a detailed model,a single-unit model,and an equivalent model,considering a wind farm as an example.A simulation analysis is then performed under the sub-synchronous frequency to prove that the model is effective and that the wind farm equivalence model method is valid.
Design and Analysis of New Modular Stator Hybrid Excitation Synchronous Motor

Hybrid excitation motor is a combination of permanent magnet motor and electric excitation motor, which can flexibly adjust the air gap magnetic field. At present, the traditional silicon steel sheet core material is widely used, but this material limits the further reduction of stator iron loss. In this paper, a new type of hybrid excitation synchronous motor with modular stator structure based on amorphous alloy material is proposed. The design power is 1kW, and the speed is 3000rpm. By placing the armature winding and electric excitation winding in the stator slot, the slip ring and brush are avoided, and the reliability of the motor is improved. The rotor adopts staggered magnetic pole structure, which has strong flux adjusting ability. The core loss is greatly reduced by using amorphous alloy. Firstly, the structure and working principle of the new motor are given; Secondly, the size parameters of the motor are given, and the principle of flux adjustment is verified and analyzed by three-dimensional finite element(3D-FEM); Finally, through theoretical analysis of the influence factors of the magnetic adjustment ability and 3D-FEM finite element computation, the flux adjustment ability and the torque lifting at low speed are verified, and the advantages of the motor are verified.
Challenges for a reduced inertia power system due to the large-scale integration of renewable energy

This paper reports on the status of technology development under a national project launched in 2019 to address the problem of decreased system inertia associated with the large-scale integration of renewable energy.The project comprises two parts:the development of a system inertia observation technology using a continuous monitoring system to observe inertia and development of an inverter equipped with a function to provide virtual inertia as a countermeasure device.Utilizing both these efforts,the project aims to facilitate the introduction of renewable energy in the future with minimum restrictions.It was confirmed that the trend of inertia observed with the developed method was generally the same as that of the total inertia of synchronous machines observed by an electric utility.The effectiveness of the countermeasure device in reducing the frequency swing during a disturbance was confirmed through evaluation tests.
MicroGrid Designer:user-friendly design,operation and control assist tools for resilient microgrid and autonomous community

During this decade,many countries have experienced natural and accidental disasters,such as typhoons,floods,earthquakes,and nuclear plant accidents,causing catastrophic damage to infrastructures.Since the end of 2019,all countries of the world are struggling with the COVID-19 and pursuing countermeasures,including inoculation of vaccine,and changes in our lifestyle and social structures.All these experiences have made the residents in the affected regions keenly aware of the need for new infrastructures that are resilient and autonomous,so that vital lifelines are secured during calamities.A paradigm shift has been taking place toward reorganizing the energy social service management in many countries,including Japan,by effective use of sustainable energy and new supply schemes.However,such new power sources and supply schemes would affect the power grid through intermittency of power output and the deterioration of power quality and service.Therefore,new social infrastructures and novel management systems to supply energy and social service will be required.In this paper,user-friendly design,operation and control assist tools for resilient microgrids and autonomous communities are proposed and applied to the standard microgrid to verify its effectiveness and performance.