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Correlation-driven threefold topological phase transition in monolayer OsBr_(2)

Frontiers of physics 2023年第3期18卷 121-130页

作者： san-dong Guo Yu-Ling Tao Wen-Qi Mu Bang-Gui Liu School of Electronic Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China

Spin–orbit coupling(SOC)combined with electronic correlation can induce topological phase transition,producing novel electronic ***,we investigate the impact of SOC combined with correlation effects on physical properties of monolayer OsBr_(2),based on first-principles calculations with generalized gradient approximation plus U(GGA+U)*** intrinsic out-of-plane magnetic anisotropy,OsBr_(2)undergoes threefold topological phase transition with increasing U,and valleypolarized quantum anomalous Hall insulator(VQAHI)to half-valley-metal dxy dx2−y2 dz2¯6m2(HVM)to ferrovalley insulator(FVI)to HVM to VQAHI to HVM to FVI transitions can be *** topological phase transitions are connected with sign-reversible Berry curvature and band inversion between/and *** to symmetry,piezoelectric polarization of OsBr_(2)is confined along the in-plane armchair direction,and only one d11 is *** a given material,the correlation strength should be fixed,and OsBr_(2)may be a piezoelectric VQAHI(PVQAHI),piezoelectric HVM(PHVM)or piezoelectric FVI(PFVI).The valley polarization can be flipped by reversing the magnetization of Os atoms,and the ferrovalley(FV)and nontrivial topological properties will be suppressed by manipulating out-of-plane magnetization to in-plane *** considered reasonable U range,the estimated Curie temperatures all are higher than room *** findings provide a comprehensive understanding on possible electronic states of OsBr_(2),and confirm that strong SOC combined with electronic correlation can induce multiple quantum phase transition.

关键词： correlation SOC phase transition piezoelectricity

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Characteristics and impacts on favorable reservoirs of carbonate ramp microfacies: A case study of the Middle-Lower Ordovician in Gucheng area,Tarim Basin,NW China

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Petroleum Exploration and development 2022年第1期49卷 107-120页

作者： LIU Yini HU Mingyi ZHANG san ZHANG Junlong GAO da XIAO Chuantao School of Geosciences Yangtze UniversityWuhan 430100China Exploration and development Research Institute PetroChina Daqing Oilfield CompanyDaqing 163712China

Based on the latest drilling core, thin section, 3d seismic, well logging data as well as exploration results, the sequence stratigraphy and sedimentary microfacies of the Middle-Lower Ordovician carbonates in Gucheng area, and their controlling effects on the development of reservoir were examined by the theories and methods of fine carbonate *** results show that the Middle-Lower Ordovician in Gucheng area is a set of typical carbonate ramp deposits, which can be divided into 10 microfacies in 4 subfacies as follows: back ramp, inner shallow ramp, outer shallow ramp, and deep ramp. The back ramp subfacies consists of muddy-dolomitic flat and dolomitic lagoon microfacies;it is dominated by lamellar micrite dolomite tight in lithology. The inner shallow ramp subfacies includes dolomitic shoal and dolomitic flat in shoal top and dolomitic flat between shoals microfacies;it is mainly composed of crystal dolomite with metasomatic residual structure, as well as abundant karst vugs and intercrystalline pores. The crystal dolomite has an average porosity of 4.36%. The outer ramp subfacies includes medium-high and low energy grain shoal and inter-shoal microfacies;it is dominated by sandy limestone,oolitic limestone, and micrite limestone with few pores. The deep ramp subfacies is dominated by low-energy argillaceous deposits, with local presences of storm shoal microfacies. The Lower-Middle Ordovician has six third-order sequences from bottom to top, among which sequence(SQ3) represents the third member of Yingying Formation. The main reservoir has three fourth-order high-frequency sequences. Apparently, the favorable reservoir in the study area is jointly controlled by sedimentary microfacies and high frequency sequence in the carbonate ramp. The former controls the primary pore structure, and the latter controls the intensities of karstification exposure and dolomitization in the penecontemporaneous period. The dolomitic shoals and top dolomitic flats of d

关键词： carbonate ramp microfacies type high frequency sequence Ordovician dolomite reservoir Tarim Basin Gucheng area

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静电场能量之两种表述及等价性探讨

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淮北师范大学学报（自然科学版） 2024年第1期45卷 82-86页

作者：陈三朱光平杨远贵淮北师范大学物理与电子信息学院安徽淮北235000

为给出静电场能量电荷体密度积分形式成立的条件和澄清把体密度积分形式直接改写为面密度积分形式的不恰当,从静电场能量的定义式出发,采用麦克斯韦方程和静电势公式推导出静电场能量的另一表达式,并对该静电场能量表达式作一般性推广,... 详细信息

为给出静电场能量电荷体密度积分形式成立的条件和澄清把体密度积分形式直接改写为面密度积分形式的不恰当,从静电场能量的定义式出发,采用麦克斯韦方程和静电势公式推导出静电场能量的另一表达式,并对该静电场能量表达式作一般性推广,用于处理电荷分布不连续的任意无限空间或有限空间区域内的静电场能量问题,具有普适性。举例说明2种能量表述形式的等价性。澄清面电荷积分形式1/2∬σϕdS来自于积分-1/2∳ϕd∙dS,而非来自积分1/2∭ϕρdV。

关键词：静电场能量电荷密度自能和互能

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不同贮藏温度对南美白对虾品质的影响

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粮食与油脂 2024年第2期37卷 85-89页

作者：陈钰庞文媛周三女马腾飞吴先辉庞杰宁德职业技术学院福建福安355000 福建农林大学食品科学学院福建福州350002

以南美白对虾为研究对象,对比分析冷藏(4℃)、微冻(-2℃)和冻藏(-18℃)条件下,虾肉的品质变化。结果表明:随着贮藏时间的延长,不同贮藏温度条件下南美白对虾的保水性、蛋白质含量、肌原纤维蛋白活性、脂肪含量均不断降低,ATP关联化合物(... 详细信息

以南美白对虾为研究对象,对比分析冷藏(4℃)、微冻(-2℃)和冻藏(-18℃)条件下,虾肉的品质变化。结果表明:随着贮藏时间的延长,不同贮藏温度条件下南美白对虾的保水性、蛋白质含量、肌原纤维蛋白活性、脂肪含量均不断降低,ATP关联化合物(K值)、硫代巴比妥酸(TBA)值均呈上升趋势。南美白对虾在4、-2、-18℃条件下贮藏的货架期分别为6、20、50 d。

关键词：南美白对虾贮藏温度货架期

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JOIN HANdS IN CONTRIBUTING TO HUMAN dEVELOPMENT THROUGH STRENGTHENING TRUST ANd COOPERATION

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Contemporary World 2019年第3期 12-13页

作者： aung san SUU KYI State Counselor of Myanmar

It gives me great honor to participate in the Thematic Forum on People-to-People Connectivity of Belt and Road Forum for International Cooperation *** friendship,we are all here in this room to discuss *** and cooperation must be based on mutual trust and *** mutual trust,there cannot be true friendship and *** occasion of every international conference is an opportunity to strengthen *** us find common ground and work together to contribute to the building of an even better ***,we are also actively solving problems we all faced in a friendly manner.

关键词： TRUST mutual Connectivity

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跌流竖井入流水舌处内嵌圆弧板的结构优化数值研究

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水电能源科学 2024年第4期42卷 80-84页

作者：魏佳芳张源芦三强黄盈盈南军虎兰州理工大学能源与动力工程学院甘肃兰州730050

跌流竖井是排水系统中结构简单且应用广泛的排水基础设施之一,但该结构入流水舌处的水气两相作用剧烈、流态复杂,且在该处常常出现竖井内的最大负压,也就容易从外界大量吸气造成下游管道臭气逸散、井喷或爆管等问题。为此,提出在竖井水... 详细信息

跌流竖井是排水系统中结构简单且应用广泛的排水基础设施之一,但该结构入流水舌处的水气两相作用剧烈、流态复杂,且在该处常常出现竖井内的最大负压,也就容易从外界大量吸气造成下游管道臭气逸散、井喷或爆管等问题。为此,提出在竖井水舌处设置内嵌圆弧板的结构优化方法,从而有效改善入流水舌流态,降低竖井内气压值和梯度变化,并减缓竖井从外界的吸气程度。在此基础上,采用Fluent三维数值模拟手段,对比分析了结构优化前后的流态、气压梯度、流速及水气分布等特性。结果表明,经过优化后的竖井模型改变了入流水舌处的液体流态,水流入射角度减小,水流撞击点的位置降低,竖井水舌处的负压值明显降低,垂直管内的整体压力梯度变化幅值减弱,从外界卷吸的气量也大幅度减小。可见所设计的新型竖井结构优化方法对跌流竖井入流水舌问题有较好的改善作用,同时也为排污管道竖井设计及优化提供一定的参考。

关键词：跌流竖井入流水舌内嵌圆弧板流态改善数值模拟

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淫羊藿苷对抑郁症模型小胶质细胞表型转化的调控作用

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天然产物研究与开发 2024年第2期36卷 187-195页

作者：曹利华高松王笑雨王真真贺红娟李娜白明苗明三河南中医药大学中医药科学院郑州450046 仲景宛西制药股份有限公司河南省中药固体制剂技术创新中心西峡474550 河南中医药大学药学院郑州450046

探索淫羊藿苷抗抑郁的作用机制,将SPF级KM小鼠分为空白组、模型组、盐酸氟西汀组(10 mg/kg)、淫羊藿苷高(50 mg/kg)、低(25 mg/kg)剂量组。除空白组外,其余各组小鼠采用56 d慢性不可预知温和应激建立抑郁症模型。造模第1 d开始灌胃给予... 详细信息

探索淫羊藿苷抗抑郁的作用机制,将SPF级KM小鼠分为空白组、模型组、盐酸氟西汀组(10 mg/kg)、淫羊藿苷高(50 mg/kg)、低(25 mg/kg)剂量组。除空白组外,其余各组小鼠采用56 d慢性不可预知温和应激建立抑郁症模型。造模第1 d开始灌胃给予各组小鼠相应药物,连续56 d。于给药后第53~56 d,进行行为学测试。末次给药后,取材。酶联免疫吸附剂实验(enzyme linked immunosorbent assay,ELISA)检测脑组织匀浆白细胞介素6(interleukin-6,IL-6)、白细胞介素10(interleukin-10,IL-10)、五羟色胺(5-hydroxytryptamine,5-HT)、多巴胺(dopamine,dA)、去甲肾上腺素(norepinephrine,NE)水平;实时荧光定量PCR(quantitative real-time PCR,RT-PCR)检测脑组织中IL-6、IL-10、诱导性一氧化氮合酶(inducible nitric oxide synthase,iNOS)、分化簇206(cluster of differentiation 206,Cd206)mRNA表达;蛋白免疫印迹(Western blot)检测脑组织iNOS、Cd206蛋白表达。体外培养小鼠小胶质细胞(BV-2),采用细胞增殖与毒性检测试剂盒(Cell Counting Kit-8,CCK-8)法检测淫羊藿苷的细胞毒性。BV-2细胞暴露于100μg/mL脂多糖及15μg/mL、25μg/mL的淫羊藿苷24 h后,收集细胞。免疫荧光技术检测细胞iNOS、Cd206蛋白表达。研究结果表明,慢性不可预知温和应激致抑郁症模型制备成功,淫羊藿苷可降低抑郁症小鼠脑组织IL-6水平及IL-6、iNOS mRNA表达,升高脑组织IL-10、5-HT、dA、NE水平及IL-10、Cd206 mRNA表达;降低脑组织iNOS蛋白,升高Cd206蛋白表达;改善模型小鼠抑郁症样行为。淫羊藿苷可降低LPS刺激的BV-2细胞iNOS蛋白表达,升高Cd206蛋白表达。结果表明,淫羊藿苷抑制小胶质细胞M1表型转化,促进M2表型转化,从而改善模型小鼠抑郁样行为。

关键词：淫羊藿苷抑郁症小胶质细胞表型转化细胞炎症模型

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Impact of pre- and peri-operative risk factors on length of stay and hospital readmission following minimally-invasive partial nephrectomy

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Asian Journal of Urology 2024年第1期11卷 72-79页

作者： Vanessa A.Lukas Rahul dutta Ashok K.Hemal Matvey Tsivian Timothy E.Craven Nicholas A.deebel david d.Thiel Ram Anil Pathak Brigham and Women's Hospital Division of UrologyDepartment of Surgery75 Francis StreetBostonMAUSA Atrium Health Wake Forest Baptist Medical Center Department of Urology1 Medical Center BlvdWinston-SalemNCUSA Mayo Clinic Florida Department of Urology4500 San Pablo RoadJacksonvilleFLUSA

Objective:We conducted an analysis of the American College of Surgeons National Surgical Quality Improvement Program database for minimally-invasive partial nephrectomy cases reported with the goal to identify pre-and peri-operative variables associated with length of stay(LOS)greater than 3 days and readmission within 30 ***:Records from 2008 to 2018 for“laparoscopy,surgical;partial nephrectomy”for prolonged LOS and readmission cohorts were *** analysis with Chi-square,t-tests,and multivariable logistic regression analysis with odds ratios(ORs),p-values,and 95%confidence intervals assessed statistical ***:Totally,20306 records for LOS greater than 3 days and 15854 for readmission within 30 days were *** and multivariable analysis exhibited similar *** LOS greater than 3 days,undergoing non-elective surgery(OR=5.247),transfusion of greater than four units within 72 h prior to surgery(OR=5.072),pre-operative renal failure or dialysis(OR=2.941),and poor pre-operative functional status(OR=2.540)exhibited the strongest statistically significant *** hospital readmission within 30 days,loss in body weight greater than 10%in 6 months prior to surgery(OR=2.227)and bleeding disorders(OR=2.081)exhibited strongest statistically significant ***:Multiple pre-and peri-operative risk factors are independently associated with prolonged LOS and hospital readmission within 30 days of surgery using the American College of Surgeons National Surgical Quality Improvement Program *** the risks factors that can potentially be improved prior to minimally-invasive partial nephrectomy is crucial to informing patient selection,optimization strategies,and patient education.

关键词： Minimally-invasive partial nephrectomy The American College of Surgeons National Surgical Quality Improvement Program Lengthof stay Hospital readmission

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基于炎性因子、卵巢功能、安全性评价宫腔镜子宫内膜电切术治疗子宫异常出血的临床疗效

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四川生理科学杂志 2024年第8期46卷 1813-1815页

作者：张三丽李爱丽李亚紧上蔡县人民医院妇科河南驻马店463800

目的:探究宫腔镜子宫内膜电切术(Hysteroscopic transcervical resection of endometrial,TCRE)治疗子宫异常出血(Abnormal uterine bleeding,AUB)的效果。方法:选取2020年1月至2023年4月本院收治的92例AUB患者作为研究对象。随机将患者分为对照组和观察组,每组各46例。对照组接受宫腔镜刮除术治疗;观察组接受TCRE治疗。对比两组的围术期指标,于术后3m对比两组手术效果、并发症,对比两组术前、术后1m、术后3 m卵巢功能[雌二醇(Estradiol,E2)、促黄体生成激素(Luteinizing hormone,LH)、促卵泡生成激素(Follicle stimulating hormone,FSH)],对比两组术前、术后1 d、术后3 d的炎性因子水平。结果:观察组的手术优良率高于对照组(Pd、3 d的血清炎性因子水平均低于对照组(P<0.05)。结论:TCRE治疗AUB患者,能减少并发症,提升手术效果,优化围术期指标,改善卵巢功能。

关键词：炎性因子卵巢功能子宫异常出血

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Caustic Failure of Thermal Insulated Tubing in Steam Flooding

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Journal of Materials Science & Technology 1997年第1期13卷 27-36页

作者： Xian, AP san, YY Zhang, d Wang, YK Sun, HP LIAOHE OIL FIELd MACHINERY PLANT PANJIN 124209PEOPLES R CHINA

The coupling of the pre-stressed thermal insulated tubing string broke down inside the steam flooding welts, after the tubing were used in high temperature and high pressure steam for about two years. With further check, it was found that most of the weld joints between the inner and outer tubing also cracked. The failure analysis for the accidents has been carried out by the analysis of chemical composition for the steels, microstructure observation, mechanical property tests, and the investigation of the service environment etc.. The results show that the early damage of the pre-stressed thermal insulated tubing string is mainly induced by the caustic stress corrosion, which can be strengthened by an unstable microstructure of the coupling serviced at high temperature for a long time. Moreover, the high pre-stress design on the thermal insulated pipe for the cyclic steam injection may be not suitable to the situation of steam flooding, which would result in the weld joint cracking.

关键词： Steel pipe

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