mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Is dual therapy the correct strategy in frail elderly patients with atrial fibrillation and acute coronary syndrome?

Atrial fibrillation (AF) is a very common arrhythmia in clinical practice. Its incidence and prevalence are age-related and are growing in the last years. Age is a risk factor also for coronary artery disease (CAD), and with the evolution of preventive care, the first event (acute coronary syndrome (ACS) or percutaneous coronary intervention (PCI)) takes place at a later age. If elderly patients with AF and CAD undergo ACS or PCI, they have indication to assume triple therapy. Triple therapy (oral anticoagulation (OAC) plus dual antiplatelet therapy (DAPT)) exposes patients to high bleeding risk. In the last 10 years, several clinical trials have tested dual therapy (OAC plus single antiplatelet therapy) in AF patients who undergo ACS or elective PCI. WOEST trial has tested warfarin+ clopidogrel against triple therapy. PIONEER AF-PCI trial has tested low-dose rivaroxaban+ P2Y12 inhibitor or very low-dose rivaroxaban+ DAPT against standard triple therapy with warfarin. RE-DUAL PCI trial has tested two doses of dabigatran+ P2Y12 inhibitor against standard triple therapy with Warfarin. AUGUSTUS trial has tested apixaban against warfarin both in dual therapy with P2Y12 inhibitor and in triple therapy with a P2Y12 inhibitor and aspirin. ENTRUST-AF PCI, last published study, has tested edoxaban+ P2Y12 inhibitor against triple therapy. All these trials show dual therapy reduces significantly bleeding risk than triple therapy. In this paper, we analyze these clinical trials to understand if dual therapy results can be applied to elderly patients and what is probably the better approach in elderly AF patients undergo to ACS or PCI.
孤立性输卵管扭转的超声特征分析

孤立性输卵管扭转在附件扭转病例中占比达9.3%~ 13.8%[1]。孤立性输卵管扭转临床表现无明显特异性,Casey等[2]报道其术前误诊率高达73%。本组回顾性分析我院术前超声诊断并经手术证实的7例孤立性输卵管扭转病例的超声图像及临床资料,总结其声像图特征。
超声诊断儿童眼眶横纹肌肉瘤并复发1例

讨论:横纹肌肉瘤是起源于横纹肌母细胞或向横纹肌细胞分化的间叶性肿瘤,好发于儿童和青少年。根据其形态可分为胚胎性、腺泡状、多形性及梭形硬化性4个亚型[1],以头颈部多发,其次为躯干、四肢等部位。眼眶横纹肌肉瘤(orbital rhabdomyosarcoma,ORMS)多为单侧发病,以迅速进展的眼球突出和移位为主要特点,后期可出现严重的球结膜和眼睑水肿,眼球多不受侵犯。ORMS恶性度高,易发生复发转移,本例患儿术后7个月复发,与此特征相符。ORMS超声表现为类圆形或不规则形,实性不均质中、低回声,血流信号较丰富,呈低速高阻动脉频谱;本例超声表现与上述特征相符。ORMS确诊需依靠免疫组化和病理学检查,至少有一种横纹肌分化标志物(Myogenin或MyoD1)呈阳性或弱阳性[2],本例患儿标志物MyoD1和Myogenin均呈弱阳性。该病应与海绵状血管瘤、淋巴瘤等鉴别诊断,临床多采取手术、放化疗等综合治疗方法,预后欠佳。
沙生药用植物锁阳根际土壤近红外光谱及其与产地环境因子的关系

目的探讨锁阳根际土壤的近红外(NIR)光谱特征及其与环境因子的关系。方法以积分球漫反射方式采集5省12个市级主产区106批锁阳根际土壤的NIR数据,对光谱数据进行预处理;解析NIR特征吸收并进行相似度分析,比较不同产区锁阳根际土壤的NIR指纹特征;对NIR特征吸收与多种环境因子进行Pearson相关分析。结果12个市级产区锁阳根际土壤的NIR指纹图谱整体一致,但局部可见吸收峰位置、光谱走势及吸光度存在差异,不同产区锁阳根际土壤的NIR光谱具有显著的指纹特征;不同产区锁阳根际土壤NIR指纹图谱的相似度具有明显差异;锁阳根际土壤NIR特征吸收与多个环境因子具有多重相关性。结论全年日照时数、年平均无霜期、年平均气温、海拔、年降雨量等是影响锁阳根际土壤NIR光谱吸收的主要环境因子,研究结果为锁阳的道地性形成及药材品质形成提供理论支持。
经胸腔镜射频消融治疗膈顶部复发性肝癌四例疗效分析

探讨经胸腔镜射频消融治疗膈顶部复发性肝癌疗效。回顾分析2016年8月至2017年8月在中国医科大学附属第一医院住院的4例膈顶部复发性肝癌患者资料,均为男性,年龄52~81岁。分析消融效果及术后患者恢复情况。随访复发情况。4例患者均因原发性肝癌行肝切除术,复查发现肝Ⅷ段肿瘤复发,紧邻膈肌。行经胸腔镜射频消融治疗,术后病灶均完全消融。4例患者术后住院时间中位数6.5(5.0~8.0)d,术后3d拔除引流管。术后肝功能损伤轻,恢复快。1例术后肝右后叶占位性病变,其余患者无异常。经胸腔镜射频消融治疗邻近膈顶的复发性肝癌是一种新的安全有效的方法,拓展了复发性肝癌的治疗途径。
高产三系杂交中稻新组合旌3优808

旌3优808是四川泰隆农业科技有限公司、垦丰长江种业科技有限公司、四川省农业科学院水稻高粱研究所利用不育系旌3A与恢复系泰恢808配组育成的三系杂交中稻新组合,具有生育期适中、产量高、穗大粒多、后期熟相好、稻瘟病抗性好等特点,2018年通过国家农作物品种审定委员会审定。
同量氮钾肥不同施肥模式对晶两优534农艺性状及品质的影响

为探索晶两优534的优化施肥模式,在安徽桐城市采用大田试验方法,在相同的氮钾肥施用量下,研究了不同施肥模式对晶两优534农艺性状和品质的影响,并总结出合理的施肥模式。结果表明,氮钾肥的施用时间适当后移,对水稻产量增产显著;穗期施用钾肥,整精米率相对较高,并可降低稻米垩白粒率和垩白度,从而有效改善稻米的品质;在本试验条件下,当氮肥基蘖肥与穗肥比例为8:2和钾肥基蘖肥与穗肥比例为6:4时,既可获得高产,又能有效改善稻米品质。
Influence of dispersants on coal-water slurry prepared from the solid residue of plasma pyrolysis of coal

This work presents the influence of dispersants on coal-water slurry (CWS), which was prepared from the solid residue of plasma pyrolysis of coal. The effects of dispersant type, solid concentration, dispersant content, and temperature on the rheological properties of CWS are examined. A suitable empirical model regarding the relation between viscosity and temperature is proposed. Through the sedimentation experiment ofCWS, dispersants are found to significantly promote the stability of CWS.
Y-STR数据库和遗传关系网络图在强奸案中的应用1例

为了突破第一个局限,即来自同一父系的男性的Y-STR数据可能一致,一般会采用加测常染色体STR的方法。对于第二个局限,1.2节中已提出了解决方法,即先利用Y-STR推测单倍群类型并排除无关样本,再使用NETWORK 5.0.1.0绘制遗传关系网络图以明确犯罪嫌疑人和数据库中样本的遗传关系,最后结合该分析结果、实际案情情况和家谱进行小规模地精准排查。需要特别指出的是,相比加测YSNP实验,利用Y-STR推测单倍群类型的方法更为经济有效,且已在此前的多次研究中得到验证。而在使用NETWORK 5.0.1.0这一软件时,只需调整好各位点的权重并导入相关数据,即可将Y-STR数据转变为直观的遗传关系网络图,整个过程省时省力。鉴于中国的家族文化和历史,Y染色体与男性的家族、姓氏息息相关,基于Y-STR的遗传关系网络图可以直接定位到犯罪嫌疑人所在家族并找到数据库中与其父系亲缘关系最为接近的人,使公安侦查不再拘泥于常染色体STR一对一的传统比对方法,可以极大地缩短破案时间。随着公安机关Y染色体DNA数据库的建设,遗传关系网络图作为破案的辅助手段,在法医学上会显示出越来越重要的应用价值。
米酵菌酸中毒引起急性肝功能损害死亡1例

上述以肝功能不全为主的多器官功能障碍的临床表现与法医学肝小叶结构破坏、肝细胞坏死等肝及其他多器官损害的病理学检验结果相符合。本次中毒案件中受米酵菌酸污染的食物为广东传统食品河粉,毒素首先引发廖某呕吐、腹痛、腹泻等消化道症状,这可能掩盖急性肝、肾损伤而延误针对米酵菌酸的解毒、保肝治疗。在法医学鉴定过程中,若死者存在下列情况,应高度重视米酵菌酸中毒的可能:(1)生前起病急骤,常以呕吐、腹痛和(或)腹泻等胃肠道症状为先兆表现,并迅速出现肝、肾、心、脑等实质器官的急性功能障碍;(2)发病前24 h内曾食用过变质淀粉类食物;(3)临床病历资料中多项肝、肾功能等实验室检查指标(如转氨酶、血糖、血氨、乳酸、凝血时间、肌酐等)异常;(4)尸体解剖及组织病理学检验发现明显肝、肾、心等实质器官形态和(或)功能损害,并行鉴别诊断以排除肝炎、其他中毒、外伤等因素;(5)血液和(或)尿液标本中有相当浓度的米酵菌酸检出。本例进行系统尸体解剖后,注重相关临床资料的收集,结合血液标本米酵菌酸的检验结果,综合分析认为廖某符合因食用霉变食物引起米酵菌酸中毒,致急性肝功能损害并继发多器官功能障碍死亡。
Response of soil respiration to nitrogen addition in two subtropical forest types

Anthropogenic activities have increased nitrogen (N) deposition in terrestrial ecosystems, which directly and indirectly affects soil biogeochemical processes, including soil respiration. However, the effects of the increases in N availability on soil respiration are not fully understood. In this study, soil respiration was measured using an infrared gas analyzer system with soil chambers under four N treatments (0, 5, 15, and 30 g N m~(-2) year~(-1) as control, low N (LN), moderate N (MN), and high N (HN), respectively) in camphor tree and slash pine forests in subtropical China. Results showed that soil respiration rates decreased by 37% in the camphor tree forest and 27% in the slash pine forest on average on an annual base, respectively, in the N-fertilized treatments when compared with the control. No significant differences were found in the soil respiration rate among the LN, MN, and HN treatments in both forest types as these fertilized plots reached an adequate N content zone. In addition, soil microbial biomass carbon (C) content and fine root biomass declined in N-treated plots compared to the control. Our results indicated that elevated N deposition might alter the tree growth pattern, C partitioning, and microbial activity, which further affect soil C sequestration by reducing soil respiration in subtropical forests of China.
Solution-phase synthesis of ordered mesoporous carbon as resonant-gravimetric sensing material for room-temperature H_2S detection

H_2S can cause multiple diseases and poses a great threat to human health.However,the precise detection of extremely toxic H_2S at room temperature is still a great challenge.Here,a facile solvent evaporation induced aggregating assembly(EIAA)method has been applied for the production of ordered mesoporous carbon(OMCs)in an acidic THF/H_2O solution with high-molecular-weight poly(ethylene oxide)-b-polystyrene(PEO-b-PS)copolymers as the structure-directing agent,formaldehyde and resorcinol as carbon precursors.Along with the continuous evaporation of THF from the mixed solution,cylindrical micelles are formed in the solution and further assemble into highly ordered mesostructure.The obtained OMCs possesses a two-dimensional(2D)hexagonal mesostructure with uniform and large pore diameter(~19.2 nm),high surface area(599 m~2/g),and large pore volume(0.92 cm~3/g).When being used as the resonant cantilever gas sensor for room-temperature H_2S detection,the OMCs has delivered not only a superior gas sensing performance with ultrafast response(14 s)and recovery(21 s)even at low concentration(2 ppm)but also an excellent selectivity toward H_2S among various common interfering gases.Moreover,the limit of detection is better than 0.2 ppm,indicating its potential application in environmental monitoring and health protection.
Solid-state template-free fabrication of uniform Mo_2C microflowers with lithium storage towards Li-ion batteries

Herein,we first report one-step synthesis of uniform Mo_2C microflowers(MCMFs)from low-cost precursors via industrialized solid-state strategy.With fine optimization in precursor ratio and pyrolysis temperatures,the as-fabricated MCMFs are assembled well with interconnected single-crystalline nanosheet subunits.More encouragingly,the resultant MCMFs are further highlighted as a competitive anode with robust and long-duration lithium-storage behaviors towards high-performance Li-ion batteries.
Aqueous-processed insulating polymer/nanocrystal solar cells with effective suppression of the leakage current and carrier recombination

As one of the most environmentally friendly photovoltaic(PV)conversion equipments,aqueous-processed CdTe nanocrystal solar cells(NC SCs)have attracted great interest in recent years because of their excellent properties such as high charge-carrier mobility and broad absorption.However,two issues including interfacial recombination and leakage current seriously restrict their performance.In this paper,insulating polymer poly(vinyl pyrrolidone)(PVP)is introduced into CdTe NC SCs to solve the problems.The experimental results of transmission electron microscopy(TEM),atomic force microscopy(AFM)and dark current measurements,etc.,demonstrate the leakage current is effectively suppressed by introducing PVP.Through further designing device structure,the reduction of interfacial recombination after introducing PVP is confirmed.By strategically taking the advantages of PVP properties(e.g.,water solubility and thermostability),the power conversion efficiency of the devices with PVP is enhanced by almost 37% compared to pure CdTe devices.This work demonstrates an effective and low-cost method to fabricate NC SCs via aqueous route.Moreover,it also proves that appropriate content of insulating polymer is of beneficial in promoting the PV performance.
Multifunctional semitransparent organic solar cells with excellent infrared photon rejection

Semitransparent organic solar cells(ST-OSCs)have the potentials to open promising applications that differ from those of conventional inorganic ones,such as see-through power windows with both energy generation and heat insulation functions.However,to achieve so,there remain significant challenges,especially for balancing critical parameters,such as power conversion efficiency(PCE),average visible transparency(AVT)and low energy infrared photon radiation rejection(IRR)to realize the full potentials of ST-OSCs.Herein,we demonstrate the new design of ST-OSCs through the rational integration of organic materials,transparent electrode and infrared photon reflector in one device.With the assistance of optical simulation,new ST-OSCs with precise layout exhibit state-of-art performance,with near 30% AVT and PCE of 7.3%,as well as an excellent IRR of over 93%(780-2500 nm),representing one of best multifunctional ST-OSCs with promising perspective for window application.
Et_2Zn-promoted β-trans-selective hydroboration of ynamide

The trans-hydroboration of alkyne represents a challenging task in organic synthesis.Reported herein is an Et_2Zn promoted β-trans hydroboration of ynamides by using N-heterocyclic carbene(NHC)-ligated borane as boryl source.The reaction leads to a stereoselective construction of enamides bearing a valuable boryl substituent.Both aromatic and aliphatic ynamides were applicable to the reaction.Synthetic transformation of the C-B bond in the product via Suzuki-Miyaura coupling provides a simple and stereospecific route to multi-substituted enamides.Mechanistic studies were conducted and the possible mechanism was discussed.
In-situ conversion of Ni_2P/rGO from heterogeneous self-assembled NiO/rGO precursor with boosted pseudocapacitive performance

Two-dimensional(2D)heterostructural Ni_2P/rGO is successfully fabricated by in-situ phosphating selfassembled NiO/rGO composites and shows the enhanced electrochemical performances.In this design,the rGO sheets effectively reduce the lattice strain created during the phase transformation from NiO to Ni_2P,thereby maintaining ultrathin nanostructures of Ni_2P.The resulting Ni_2P/rGO layered hetero-structure gives the composite plenty of pores or channels,good electrical conductivity and well-exposed active sites.Density functional theory(DFT)calculation further demonstrates that the Fermi energy level and electron localize of near Ni atoms in Ni_2P is higher than that of NiO,which endow Ni_2P with faster and more reversible redox reactivity in dynamic.Benefiting from their structural and compositional merits,the as-synthesized Ni_2P/rGO exhibits high specific discharge capacity and excellent rate performance.Furthermore,a hybrid supercapacitor built with Ni_2P/rGO and activated carbon shows a high specific energy of 38.6 Wh/kg at specific power of 375 W/kg.
Dynamic covalent chemistry-regulated stimuli-activatable drug delivery systems for improved cancer therapy

Drug delivery systems(DDSs)are of paramount importance to deliver drugs at the intended targets,e.g.,tumor cells or tissue by prolonging blood circulation and optimizing the pharmaceutical profiles.However,the therapeutic efficacy of DDSs is severely impaired by insufficient or non-specific drug release.Dynamic chemical bonds having stimuli-liable properties are therefore introduced into DDSs for regulating the drug release kinetics.This review summarizes the recent advances of dynamic covalent chemistry in the DDSs for improving cancer therapy.The review discusses the constitutions of the major classes of dynamic covalent bonds,and the respective applications in the tumor-targeted DDSs which are based on the different responsive mechanisms,including acid-activatable and reduction-activatable.Furthermore,the review also discusses combination strategies of dual dynamic covalent bonds which can response to the complex tumor microenvironment much more accurately,and then summarizes and analyzes the prospects for the application of dynamic covalent chemistry in DDSs.
创伤患者谵妄的早期识别及预防护理策略研究进展

从创伤谵妄早期识别(包括危险因素的识别和评估工具的应用)、预防护理策略(包括谵妄发生风险预测模型的构建和对因治疗护理)、以及管理策略三方面进行综述,为创伤患者谵妄的早期识别和预防提供参考。
新型冠状病毒肺炎危重症救治定点医院驰援护士院感防控培训与管理

目的探讨在疫情紧急的情况下,针对新型冠状病毒肺炎危重症救治定点医院驰援护士进行医院感染防控培训和管理的方法。方法综合运用现场授课、网络培训、培养感控专员法、宣传法、视频监控法、日常巡查法和主题会议法对外省医疗队的护理人员进行新冠定点医院感染防控培训与管理。结果以来自江苏省的100名护理人员为例,在驰援51d后全部安全撤离,无医护人员感染新型冠状病毒。结论新型冠状病毒肺炎救治定点医院感染防控方案在驰援护士医院感染防控培训和管理工作中取得了较好效果,符合疫情特殊时期医院感染防控要求,保障了医护人员的职业防护安全。
基于文献计量学的预立医疗照护计划研究现状及热点分析

目的系统地梳理预立医疗照护计划领域研究脉络,探究预立医疗照护计划领域热点话题、学科发展和研究方向,为后续研究提供借鉴和思路。方法按照检索式在Web of Science数据库中检索2009 ~ 2019年预立医疗照护计划相关文献,并使用CiteSpace软件对所得文献数据进行可视化分析。结果共纳入3 230篇文献。预立医疗照护计划研究的相关文献数量呈增长趋势,高影响力期刊集中于卫生保健、老年医学、肿瘤学、内科学等医学领域。从研究热点来看,主要包括临终护理领域、初级卫生保健领域的预立医疗照护计划研究,预立医疗照护计划的基本要素研究、护士在预立医疗照护计划中的作用。结论预立医疗照护计划领域研究热点呈现多元化,未来研究应注重理论与实践的有机结合,并积极探索预立医疗照护计划发展的全球性策略。
Immune checkpoint inhibitors in malignant lymphoma: Advances and perspectives

Classical Hodgkin lymphoma (cHL) has been identified with universal genetic alterations of chromosome 9p24.1, which contains PD-L1/PD-L2 genes. The amplification of 9p24.1 is associated with the increased expression of PDL1 and PD-L2 on RS cells, which promotes their immune evasion, and subsequently makes cHL sensitive to PD-1 blockade. Several PD-1 inhibitors have shown significant efficacies with overall response rate (ORR) of 70%–90% in relapse/refractory (r/r) cHL and have acquired the approvals for this indication. Recently, more and more studies are conducted to investigate PD-1 blockade in earlier disease course and in combination with neo-agents or chemotherapy. Unlike cHL, non-Hodgkin lymphoma (NHL) consists of numerous subtypes harboring highly biological heterogeneity. Only a few subtypes have been shown to have genetic alteration of 9p24.1 including primary mediastinal B cell lymphoma (PMBL), gray zone lymphoma (GZL) with features intermediate between diffuse large B cell lymphoma (DLBCL) and cHL, primary central nervous system lymphoma (PCNSL) and primary testicular lymphoma (PTL). Epstein-Barr virus (EBV)-associated lymphomas have a virally mediated overexpression of PD-L1, also making them sensitive to PD-1 blockade. Therefore, PD-1 inhibitors are less effective in most r/r NHL than in r/r cHL. Further understanding of the biological features of NHL and immune checkpoint inhibitors (ICPi) combined therapy is the research focus in the future. In this review, we outlined the recent progress of ICPi in lymphoma originating from clinical studies.
Advanced Data Collection and Analysis in Data-Driven Manufacturing Process

The rapidly increasing demand and complexity of manufacturing process potentiates the usage of manufacturing data with the highest priority to achieve precise analyze and control, rather than using simplified physical models and human expertise. In the era of data-driven manufacturing, the explosion of data amount revolutionized how data is collected and analyzed. This paper overviews the advance of technologies developed for in-process manufacturing data collection and analysis. It can be concluded that groundbreaking sensoring technology to facilitate direct measurement is one important leading trend for advanced data collection, due to the complexity and uncertainty during indirect measurement. On the other hand, physical model-based data analysis contains inevitable simplifications and sometimes ill-posed solutions due to the limited capacity of describing complex manufacturing process. Machine learning, especially deep learning approach has great potential for making better decisions to automate the process when fed with abundant data, while trending data-driven manufacturing approaches succeeded by using limited data to achieve similar or even better decisions. And these trends can demonstrated be by analyzing some typical applications of manufacturing process.
疟疾相关急性呼吸窘迫综合征一例

恶性疟疾临床症状复杂多样,病情凶险,疟疾相关急性呼吸窘迫综合征鲜见报道,其发病率尚无确切统计资料。本例患者入院后诊断为恶性疟疾,经抗疟治疗后体温逐渐控制,但出现胸闷、气促等呼吸系统症状,且进行性加重,双肺有渗出性病变,诊断为疟疾相关急性呼吸窘迫综合征,经抗疟、呼吸支持、糖皮质激素等治疗后好转。提示疟疾相关急性呼吸窘迫综合征病情发展迅速,但经过临床积极治疗后可好转,快速诊断及治疗是救治的关键。
New Understanding of Variation Characteristics of Well Water Level in Majiagou Mine,Tangshan City,Hebei,China

Based on the well water level data in Majiagou Mine in Tangshan City since 2000,it is suggested that the water level rise from 2008 - 2014 is possibly associated with reduced infiltration caused by less precipitation,together with the effect of less groundwater exploitation. However,the water level rise from 1992 - 1998 cannot be interpreted properly if we extend the data source back to 1991. After comparing the data with long-term water level data of five wells with different hydro-geological units in Tangshan and Qinhuangdao, the study indicates that the long-term water level variation cannot be only attributed to the effect of less precipitation and the control of groundwater exploitation,but also with the influence of regional stress field change. With the support of regional geological and tectonic information,combined with the comprehensive analysis of CBM data obtained from the coal field,new understandings of the dynamic characteristics of annual variation are obtained.
Characteristics of Seismic Damage of Buildings: Constraints from Tilt Photography Technology

In this paper,the tilt photography data acquisition and three-dimensional modeling of the Tashkurgan M_S5.5 earthquake in Xinjiang are conducted using the tilt photography system of the Rotor UAV. The three-dimensional model is used to interpret the earthquake damage on buildings in the mega-earthquake area in order to acquire different-level house damage in the Kuzirun village disaster area. In addition, the characteristics of seismic damage on typical buildings are analyzed. The results show that the main collapsed houses in the mega-earthquake area are sand-stone buildings,of which about 39% are sand-stone buildings. Several brick-wood buildings and brick-concrete buildings are seriously damaged,while the buildings with frame structures are mainly slightly damaged,and the houses near the macro-epicenter of the earthquake are all in good conditions. Three-dimensional tilt photography technology can vividly display the scene of earthquake disaster,and can provide significant demonstration in building damage degree together with detailed analysis of disaster situation.
Study of the Seismogenic Structure of the October 12~(th), 2019 M_S 5.2 Beiliu Earthquake,Guangxi,China

On October 12~(th),2019,a M_S5.2 earthquake occurred in Beiliu City,Guangxi Zhuang Autonomous Region,China,with a focal depth of 10 km. The epicenter is located in the junction of Guangxi and Guangdong where the moderate-strong earthquakes are relatively active. The highest intensity of this earthquake is estimated up to Ⅵ besides the isoseismic line showed an ellipse shape with a long axis trend in the NW direction. The aftershocks are not evenly distributed. The parameters of the focal mechanism solutions are: strike 346°,dip 85°,rake 19° for the nodal planeⅠ,and strike 254°, dip 71°,rake 175° for the nodal planeⅡ. The type of the coseismic fault is strikeslip. After analyzing these results above and the active faults near the epicenter,we get that the nodal planeⅠ is interpreted as the coseismic rupture plane and the Bama- Bobai Fault is a seismogenic structure of M_S5.2 Beiliu earthquake.
Influence of Bedding and Mineral Composition on Mechanical Properties and Its Implication for Hydraulic Fracturing of Shale Oil Reservoirs

The premise of hydraulic fracturing is to have an accurate and detailed understanding of the rock mechanical properties and fracture propagation law of shale reservoirs. In this paper,a comprehensive evaluation of the mechanical properties of the shale oil reservoir in the south of Songliao Basin is carried out. Based on the experiments and the in-situ stress analysis, the fracture propagation law of three types of shale reservoirs is obtained,and the suggestions for fracturing are put forward. The results have shown that the fracture propagation of pure shale and low mature reservoir is easy to open along the bedding plane under compression loading,which is greatly influenced by the bedding. Sand-bearing shale is slightly better,the fractures of which are not easy to open along the bedding plane. The mechanical experimental results show that all the samples have the characteristics of low compressive strength,low Young's modulus and strong anisotropy,indicating that the shale oil reservoir is certain plastic,which is related to its high clay mineral content and controlled by the bedding development. Compared with pure shale and low mature shale,the sandbearing shale has less clay content and less developed bedding,which maybe the main reason for its slightly better brittleness. Overall,the expansion of hydraulic fracture is controlled by in-situ stress and bedding. Because of the development of bedding,it is easy to form horizontal fractures. Thus it is not suitable for horizontal well fracturing. Because of the high content of clay minerals,the applicability of conventional slick hydraulic fracturing fluid is poor. It is suggested to use vertical well or directional well to carry out volume fracturing. In this way,the effect of bedding can be effectively used to open and connect the bedding and form a larger fracture network.