mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Origin of the Gas Hydrate and Free Gas in the Qilian Permafrost,Northwest China:Evidence from Molecular Composition and Carbon Isotopes

The Qilian permafrost of the South Qilian Basin(SQB)has become a research focus since gas hydrates were discovered in 2009. Although many works from different perspectives have been conducted in this area,the origin of gas from gas hydrate is still controversial. Molecular composition and carbon isotope of 190 samples related to gas hydrates collected from 11 boreholes allowed exploration of genetic type,thermal maturity,biodegradation,as well as gas-source correlation of alkane gases from gas hydrates and free gases. Results indicate that alkane gases biodegraded after the formation of natural gas. According to differences in carbon isotopes of methane and their congeners(CH_4,C_2H_6,C_3H_8),the thermal maturity(vitrinite reflectance,VRo)of most alkane gases ranges from 0.6% to 1.5%,indicating a mature to high mature stage. The thermal maturity VRo of a small part of alkane gas(in boreholes DK5 and DK6)is higher than 1.3%,indicating a high mature stage. Alkane gases were mainly produced by secondary cracking,consisting of crude oilcracking gases and wet gases cracking to dry gases. Genetic types of alkane gases are primarily oil-type gases generated from shales and mudstones in the upper Yaojie Formation of Jurassic,with less coal-type gases originated from the mudstones in the Triassic Galedesi Formation and the lower Yaojie Formation of Jurassic. Carbon dioxides associated with alkanes from gas hydrates and free gases indicate the thermal decomposition and biodegradation of organic matter. The origins of natural gases from gas hydrates and free gases shed light on the evaluation of petroleum resource potential,deeply buried sediments,and petroleum resource exploration in the SQB.
Estimating Hansen solubility parameters of organic pigments by group contribution methods

The Hansen solubility parameters (HSP) are frequently used for solvent selection and characterization of polymers, and are directly related to the suspension behavior of pigments in solvent mixtures. The performance of currently available group contribution (GC) methods for HSP were evaluated and found to be insufficient for computer-aided product design (CAPD) of paints and coatings. A revised and, for this purpose, improved GC method is presented for estimating HSP of organic compounds, intended for organic pigments. Due to the significant limitations of GC methods, an uncertainty analysis and parameter confidence intervals are provided in order to better quantify the estimation accuracy of the proposed approach. Compared to other applicable GC methods, the prediction error is reduced significantly with average absolute errors of 0.45 MPa~(1/2), 1.35 MPa~(1/2), and 1.09 MPa~(1/2) for the partial dispersion (δ_D), polar (δ_P) and hydrogen-bonding (δ_H) solubility parameters respectively for a database of 1106 compounds. The performance for organic pigments is comparable to the overall method performance, with higher average errors for δ_D and lower average errors for δ_P and δ_H.
Microfluidic reactor with immobilized enzyme-from construction to applications: A review

Microfluidic, as the systems for using microchannel(micron-or sub-micron scale)to process or manipulate microflow, is being widely applied in enzyme biotechnology and biocatalysis. Microfluidic immobilized enzyme reactor(MIER)is a tool with great value for the study of catalytic property and optimal reaction parameter in a flourishing and highly producing manner. In view of its advantages in efficiency,economy, and addressable recognition especially, MIER occupies an important position in the investigation of life science, including molecular biology, bioanalysis and biosensing, biocatalysis etc. Immobilization of enzymes can generally improve their stability, and upon most occasions, the immobilized enzyme is endowed with recyclability. In this review, the enzyme immobilization techniques applied in MIER will be discussed, followed by summarizing the novel developments in the field of MIER for biocatalysis, bioconversion and bioanalysis. The preponderances and deficiencies of the current state-of-the-art preparation ways of MIER are peculiarly discussed. In addition, the prospects of its future study are outlined.
凶险性前置胎盘并胎盘植入危险因素及不同影像学方式诊断价值探究

目的:探究凶险性前置胎盘并胎盘植入危险因素,并评估磁共振成像(MRI)与彩色多普勒超声两种不同影像学检查方法对凶险性前置胎盘并胎盘植入的诊断价值。方法:收集2017年11月至2019年11月河南省人民医院收治的凶险性前置胎盘并胎盘植入患者(植入组)103例和单纯凶险性前置胎盘患者(非植入组)144例,患者产前均进行MRI与彩超检查。采用单因素以及多因素logistics回归分析凶险性前置胎盘并胎盘植入发生的危险因素。以手术病理结果为诊断标准,分析MRI与彩超对凶险性前置胎盘并胎盘植入的诊断价值。结果:多因素logistic回归分析显示,患者年龄≥35岁、孕产次、剖宫产次、剖宫产史≥2次、中央型胎盘以及胎盘主体附着前壁是凶险性前置胎盘并胎盘植入发生的影响因素(P<0.05)。与手术病理诊断结果比较,MRI产前诊断胎盘植入116例,非胎盘植入131例,其中23例误诊胎盘植入,10例胎盘植入未检出;彩超产前诊断胎盘植入122例,非胎盘植入125例,其中39例误诊胎盘植入,20例胎盘植入未检出。MRI诊断凶险性前置胎盘并胎盘植入的灵敏度、特异度、准确率、阳性预测值和阴性预测值均高于彩超诊断,差异有统计学意义(P<0.05)。MRI对粘连型胎盘的检出率[66.67%(20/30)]高于彩超[40.00%(12/30)](P<0.05),对植入型胎盘的检出率[87.69%(57/65)]与彩超[81.54%(53/65)]无明显差异(P>0.05),对穿透型胎盘的检出率[100.00%(8/8)]高于彩超[62.50%(5/8)](P>0.05);MRI对胎盘附着前壁并植入的检出率[90.63%(58/64)]与彩超[87.50%(56/64)]无明显差异(P>0.05),对胎盘附着后壁并植入的检出率[81.48%(22/27)]高于彩超[55.56%(15/27)](P<0.05),对胎盘附着侧壁并植入的检出率[83.33%(10/12)]高于彩超[41.67%(5/12)](P<0.05)。结论:患者高龄、多次妊娠及分娩、剖宫产史≥2次、中央型胎盘以及胎盘主体附着前壁是影响凶险性前置胎盘并胎盘植入的危险因素,需加强此类患者孕期监护,MRI对粘连型凶险性前置胎盘,主体附着于后壁、侧壁并植入型前置胎盘具有更高的检出率,可作为彩超的补充检查手段。
妊娠中期首发成人斯蒂尔病继发多脏器功能障碍再次妊娠成功分娩1例

妊娠期AOSD十分罕见,诊断非特异性,属排他性诊断,加上产科医生对此类疾病认识不足,极易造成误诊、漏诊。临床医生对不明原因发热,皮疹(或近期有皮疹史)和(或)肝功能异常的孕妇,应考虑到免疫系统疾病,及时完善相关检查,早期诊断及治疗对预后尤为重要。对确诊AOSD妇女孕前需评估病情稳定性,指导受孕,由产科、风湿免疫科、感染科、新生儿科等共同管理;孕期定期检测SF、ESR、尿蛋白及产科专科检查,争取良好妊娠结局。
腹腔镜胆囊切除术后钛合金夹游走致十二指肠穿孔1例

LC因创伤小、术后恢复快等优点在临床上得到普遍应用,术中用于夹闭胆囊管残端和胆囊动脉的金属夹可有多种选择,钛合金夹操作简单且价格低廉,临床应用较多。LC后钛合金夹游走并导致十二指肠穿孔的可能原因如下:①钛合金夹偶然脱落后,其尖端长期挤压邻近十二指肠,致肠壁组织逐渐坏死而形成瘘管,钛合金夹沿瘘管进入肠腔,其缓慢致病过程类似于Bouveret综合征形成的"内瘘";②胆囊管汇入胆总管位置偏低时,若术中置夹角度与十二指肠壁垂直,术后钛合金夹尖端可直接压迫十二指肠壁,导致十二指肠穿孔;③LC中人为因素造成胆道损伤,胆汁外漏致术区周围组织发生炎症,质地变脆,脱落的钛合金夹经脆弱的十二指肠肠壁进入肠道。多排螺旋CT具有快速成像、组织分辨率高的特点,联合应用多平面重建技术,对显示肠道高密度异物具有独特优势。本例应用多排螺旋CT及后处理技术以多角度清晰显示了钛合金夹游走致十二指肠穿孔的位置以及提供邻近重要脏器如肝脏、胆总管等的解剖信息,之后经由胃镜成功取出异物,达到满意疗效。
内陆干旱区尾闾湖湿地识别及其景观结构动态变化---以艾比湖湿地为例

在全球生态系统之中,湿地发挥着重要作用。湿地易于退化,在干旱地区湿地干缩则表现得更为显著,而湿地作为干旱地区水资源的重要载体,其生态功能不可替代。干旱区湿地对于气候因素的波动以及人为因素的响应更为敏感,湿地所在区域的环境变化可以通过湿地的流转、消亡、干缩、发育等进行深刻反映。因此,开展干旱区湿地研究对区域的水资源合理配置、湿地景观格局变过程及其驱动机制具有重大科学意义。论文抓住湿地扩缩与继发的环境效应的这一核心问题,以国家重要湿地---艾比湖湿地国家级自然保护区为研究靶区,收集了近30年来春、夏、秋3个季节的遥感数据,以随机森林RF为主要分类器,对湿地的空间结构变化、转移特征、时空关联模式、景观格局、空间连通性等进行分析,同时在分析这些主要气象水文要素的多尺度变化的基础上,探索湿地变化对气候变化的响应机制。
Big-M based MILP method for SCUC considering allowable wind power output interval and its adjustable conservativeness

In contrast to most existing works on robust unit commitment (UC), this study proposes a novel big-M-based mixed-integer linear programming (MILP) method to solve security-constrained UC problems considering the allowable wind power output interval and its adjustable conservativeness. The wind power accommodation capability is usually limited by spinning reserve requirements and transmission line capacity in power systems with large-scale wind power integration. Therefore, by employing the big-M method and adding auxiliary 0-1 binary variables to describe the allowable wind power output interval, a bilinear programming problem meeting the security constraints of system operation is presented. Furthermore, an adjustable confidence level was introduced into the proposed robust optimization model to decrease the level of conservatism of the robust solutions. This can establish a trade-off between economy and security. To develop an MILP problem that can be solved by commercial solvers such as CPLEX, the big-M method is utilized again to represent the bilinear formulation as a series of linear inequality constraints and approximately address the nonlinear formulation caused by the adjustable conservativeness. Simulation studies on a modified IEEE 26-generator reliability test system connected to wind farms were performed to confirm the effectiveness and advantages of the proposed method.
State coordinated voltage control in an active distribution network with on-load tap changers and photovoltaic systems

Decreasing costs and favorable policies have resulted in increased penetration of solar photovoltaic (PV) power generation in distribution networks. As the PV systems penetration is likely to increase in the future, utilizing the reactive power capability of PV inverters to mitigate voltage deviations is being promoted. In recent years, droop control of inverterbased distributed energy resources has emerged as an essential tool for use in this study. The participation of PV systems in voltage regulation and its coordination with existing controllers, such as on-load tap changers, is paramount for controlling the voltage within specified limits. In this work, control strategies are presented that can be coordinated with the existing controls in a distributed manner. The effectiveness of the proposed method was demonstrated through simulation results on a distribution system.
Energy hub-based optimal planning for integrated energy systems considering part-load characteristics and synergistic effect of equipment

Integrated energy systems (IESs) represent a promising energy supply model within the energy internet. However, multi-energy flow coupling in the optimal configuration of IES results in a series of simplifications in the preliminary planning, affecting the cost, efficiency, and environmental performance of IES. A novel optimal planning method that considers the part-load characteristics and spatio-temporal synergistic effects of IES components is proposed to enable a rational design of the structure and size of IES. An extended energy hub model is introduced based on the “node of energy hub” concept by decomposing the IES into different types of energy equipment. Subsequently, a planning method is applied as a two-level optimization framework-the upper level is used to identify the type and size of the component, while the bottom level is used to optimize the operation strategy based on a typical day analysis method. The planning problem is solved using a two-stage evolutionary algorithm, combing the multiple-mutations adaptive genetic algorithm with an interior point optimization solver, to minimize the lifetime cost of the IES. Finally, the feasibility of the proposed planning method is demonstrated using a case study. The life cycle costs of the IES with and without consideration of the part-load characteristics of the components were $4.26 million and $4.15 million, respectively, in the case study. Moreover, ignoring the variation in component characteristics in the design stage resulted in an additional 11.57% expenditure due to an energy efficiency reduction under the off-design conditions.
Spatio-temporal patterns of the Red-footed Falcon's hunting behavior during the nestling period suggest ad hoc conservation policies

The Red-footed Falcon (Falco vespertinus) is a species of high international conservation interest. We analyzed its hunting behavior at the two largest colonies in Italy during the nestling period. Using accurate data-loggers, we tracked three adult Red-footed Falcons in June and July, 2019 and collected 4703 GPS points. We detected clear patterns of hovering and perching activity (HPA) in both time and space. HPA occupied one-third of the Red-footed Falcons' day, and showed two peaks just after sunrise (between 35 and 40% of the monitoring time) and just before sunset (50-60%) in both June and July, and minimum (20-30%) at night and during the hottest time interval (10:00 a.m.-4:00 p.m.). Almost 40% of HPA occurred within 50 m from nests. Our findings, although preliminary, have important implications for the conservation of these two colonies that are located within two Natura 2000 sites. The detected spatio-temporal patterns of Red-footed Falcons' hunting behavior suggests the creation of two nested protection belts: the inner one is a narrow belt (up to 50 m from the two rows of trees that host the two colonies) with integral conservation, and hopefully increase the alfalfa crops and fallow land, and the outer belt (50 m~(-2) km) with optimized agricultural activities.
A new general index of home range overlap and segregation: the Lesser Kestrel in Southern Italy as a case study

Background: There is increasing interest in evaluating home-range overlap (or, otherwise, segregation) between bird species, and between or within bird populations, to inform spatial planning. So far, studies of home-range overlap typically make use of comparisons between pairs of individuals, populations or species, and return a matrix of pairwise overlaps (e.g., percent overlaps). However, when the number of individuals, populations or species to be compared is elevated, an overlarge overlap matrix is difficult to interpret from an ecological viewpoint.Methods: We propose here a new, conceptually simple and computationally efficient index (general overlap index; GOI) for the ready computation within GIS of home range overlap of an arbitrarily large number (i.e., n ≥ 2) of individu-als, populations or species. Whatever the number of home ranges to be compared, GOI always returns a single score between 0 and 100. As a case study, we applied our index to 24,074 GPS points of 10 Lesser Kestrels (Falco naumanni) in order to estimate within-colony and between-colony overlaps in two neighboring colonies in Southern Italy.Results: Within-colony overlap was elevated for both colonies (96.41% at Cassano delle Murge, n = 5 individuals; 81.38% at Santeramo in Colle, n = 5 individuals), while between-colony overlap was low (19.12%; n = 2 colonies) and, after a randomization procedure, more spatially-segregated than expected by chance.Conclusions: Modern biotelemetry offers huge amounts of data describing the space use of animal species. The use of intuitive and straightforward indices, like GOI, can be useful to promptly extract ecological information from such an amount of data (e.g. detecting change in space use over successive years, evaluating the reliability of various home-range estimators).
Simulation of maize drought degree in Xi'an City based on cusp catastrophe model

Drought generally has significant impacts on crops.It is essential to quantitatively evaluate the relationship between crop production and drought degree to provide technical support for drought disaster prevention.In this study,a drought degree index that can reflect the changes in precipitation,evapotranspiration,and soil moisture was developed on the basis of crop yield reduction rate.Four drought scenarios were set up to simulate the effects of meteorological drought on drought degree of crops at different growth stages.A cusp catastrophe model was constructed to analyze the mutation characteristics of the drought degree of maize at different growth stages under different meteorological drought conditions.Xi'an City in China was selected as the study area,and summer maize was selected as the research crop.Precipitation and crop yield data from 1951 to 2010 were used as the fundamental data to investigate drought degree mutation of summer maize.The results show that,under the meteorological drought conditions at the emergence-jointing stage,drought degree may change abruptly,and soil moisture content at the sowingemergence,jointing-tasseling,and tasseling-mature stages should be kept higher than 39%.
Passivation of PEA~+ to MAPbI_3 (110) surface states by first-principles calculations

The MAPbI_3 (110) surface with low indices of crystal face is a stable and highly compatible photosensitive surface. Since the electronic states on the surface can be detrimental to the photovoltaic efficiency of the device, they should be passivated. Phenylethylamine (PEA~+), as a molecular ligand, has been widely used in continuous degradation and interfacial charge recombination experiments, and has satisfactory performance in improving surface defects. Therefore, we construct an adsorption model of MAPbI_3 with small molecules, calculating the lattice structure and electronic properties of PEA~+-adsorbed MAPbI_3 (110) surface. It is found that PEA~+ as a passivator can effectively weaken the electronic states and regulate the band gap of the MAPbI_3 (110) surface. Before and after adding the passivator, the peak value of electronic state densities at MAPbI_3 (110) surface is reduced by about 50%, and the band gap is apparently reduced. Moreover, by comparing the Bader atomic charge and spatial charge distributions before and after PEA~+’s adsorption on the surface of MAPbI_3, we observe a substantial change of PEA~+ charges, which suggests the surface states have been passivated by PEA~+.
Effect of strain on electrochemical performance of Janus MoSSe monolayer anode material for Li-ion batteries: First-principles study

First-principles calculations are performed to investigate the effect of strain on the electrochemical performance of Janus MoSSe monolayer. The calculation focuses on the specific capacity, intercalation potential, electronic structure, and migration behavior of Li-ion under various strains by using the climbing-image nudged elastic band method. The result shows that the specific capacity is nearly unchanged under strain. But interestingly, the tensile strain can cause the intercalation potential and Li-ion migration energy barrier increase in MoSSe monolayer, whereas the compressive strain can lead to the intercalation potential and energy barrier decreasing. Thus, the rate performance of the MoSSe anode is improved. By analyzing the potential energy surface of MoSSe surface and equilibrium adsorption distance of Li-ion, we explain the physical origin of the change in the intercalation potential and migration energy barrier. The increase of MoSSe potential energy surface and the decrease of adsorption distance caused by tensile strain are the main reason that hinders Li-ion migration.
A Markov-switching dynamic regression analysis of the asymmetries related to the determinants of US crude oil production between 1982 and 2019

The structural changes brought about by shale oil revolution have inspired this paper of which the aim is to analyze the potential asymmetries related to the determinants of crude oil production in the USA.Thus,using a Markov-switching dynamic regression model in which parameters change when oil production moves from one regime to the other,it is found that for both oil production and oil relative importance,the regime that was dominant during the 1980 s and the early 1990 s when oil production in the USA was substantially high is the same regime that has once again become dominant in the decade corresponding to the shale oil revolution.Furthermore,the study reveals the existence of asymmetries in the relationship between US crude oil production and both manufacturing production and the consumer price index.Asymmetries are also found in the relationship between the relative importance US crude oil and manufacturing production.Finally,it is found that the intercept and the variance parameter also vary from one regime to the other,thus justifying the use of regime-dependent models.
Temperature-resistant and salt-tolerant mixed surfactant system for EOR in the Tahe Oilfield

A new temperature-resistant and salt-tolerant mixed surfactant system(referred to as the SS system)for enhancing oil recovery at the Tahe Oilfield(Xinjiang,China)was evaluated.Based on the analysis of the crude oil,the formation water and rock components in the Tahe Oilfield,the long-term thermal stability,salt tolerance and the ability to change the wettability,interfacial activity and oil washing efficiency of the mixed surfactant system were studied.The system contains the anionic surfactant SDB and another cationic surfactant SDY.When the total mass concentration of the SS solution is 0.15 wt%,m(SDB)/m(SDY)ratio is 1 to 1,and excellent efficiencies are achieved for oil washing for five kinds of Tahe Oilfield crude oils(more than 60%).In addition,after adding cationic surfactant,the adsorption capacity of the surfactant is further reduced,reaching 0.261 mg/g.The oil displacement experiments indicate that under a temperature of 150 °C and a salinity of 24.6 × 10~4 mg/L,the SS system enhances the oil recovery by over 10% after water flooding.The SS anionic-cationic surfactant system is first presented in the open literature that can be successfully applied to obtain predictions of Tahe Oilfield carbonate reservoirs with a high temperature and high salinity.
Bed type and flow mechanism of deep water sub-lacustrine fan fringe facies: an example from the Middle Permian Lucaogou Formation in Southern Junggar Basin of NW China

Submarine or sub-lacustrine lobe deposits are important reservoirs,but the fan fringe deposits form heterogeneities within deep water fan deposits.Fan fringe facies records the complex sediment gravity flow types.By understanding of the bed types and flow mechanisms,we can identify the fan fringe deposit,which aids in the reconstruction of deep water fan and reservoir evaluations.The Jiucaiyuanzi and Dalongkou sections in the West Bogda Mountains preserve well-exposed 536-m and 171-m thick successions,respectively,of a deep water lacustrine depositional system from the Middle Permian Lucaogou Formation.Bed types of the Lucaogou Formation include high-density turbidite,low-density turbidite,incomplete Boumatype turbidite,hybrid event beds,and slump deposits.The Lucaogou Formation is interpreted here as a fan fringe facies due to the thin bed thickness that characterize turbidites and hybrid event beds,as well as the predominance of the isolated sheet architecture.Previous studies suggest that these deposits were considered as deposited in a deep water setting due to the absence of wave-related structures.The presence of abundant mud clasts in massive medium-coarse grained sandstone beds reflects the significant erosional capability and interactions between high-density turbidity currents and lake floor.The fan fringe facies here contains amalgamated and thick-bedded homolithic facies(~ 30%)and thin-bedded heterolithic facies(~ 70%).The examination of the bed type is of wider significance for facies prediction and reservoir heterogeneity in the sub-lacustrine fan fringe facies.
Design, fabrication, and cold test of an S-band high-gradient accelerating structure for compact proton therapy facility

An S-band high-gradient accelerating structure is designed for a proton therapy linear accelerator (linac) to accommodate the new development of compact, singleroom facilities and ultra-high dose rate (FLASH) radiotherapy. To optimize the design, an efficient optimization scheme is applied to improve the simulation efficiency. An S-band accelerating structure with 2856 MHz is designed with a low beta of 0.38, which is a difficult structure to achieve for a linac accelerating proton particles from 70 to 250 MeV, as a high gradient up to 50 MV/m is required. A special design involving a dual-feed coupler eliminates the dipole field effect. This paper presents all the details pertaining to the design, fabrication, and cold test results of the S-band high-gradient accelerating structure.
Microstructure,magnetic properties of hexagonal barium ferrite powder based on calcination temperature and holding time

In this paper, single-phase and fine-grain hexagonal barium ferrite powder was prepared based on the optimal calcination condition.The influence of calcination conditions including temperature and holding time on microstructure and magnetic properties of powder were studied in detail.Firstly, θ-2θ scan X-ray diffraction (XRD) results reveal that it is hard to obtain single phase of powder when the calcination temperature is lower than 850 °C.In addition, the calcination time for single phase of barium ferrite powder was reduced with the increase in calcination temperature.Scanning electron microscopy (SEM) images and magnetic hysteresis loops show that the condition of low temperature and long holding time is beneficial for obtaining homogeneous size of grain and excellent magnetic properties.Consequently, hexagonal barium ferrite powder with uniform grain size of ~180 nm, high purity and excellent magnetic properties is obtained at optimal calcination condition of 850 °C-10.0 h.