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铁道学报 2024年第1期46卷 34-41页

作者：叶飞刘启钢石磊孙文桥杨瑜金晶中国铁道科学研究院研究生部北京100081 中国铁道科学研究院集团有限公司运输及经济研究所北京100081 中国国家铁路集团有限公司货运部北京100844

铁路货运安全是确保铁路行车安全、货物安全、旅客安全的重要基础,是确保铁路货运持续增量的重要支撑。针对当前铁路货运安全事故隐患分析耗时长、错误多的问题,按照5M1E质量管理思路,结合铁路货运作业主要安全风险环节,系统分析铁路货... 详细信息

铁路货运安全是确保铁路行车安全、货物安全、旅客安全的重要基础,是确保铁路货运持续增量的重要支撑。针对当前铁路货运安全事故隐患分析耗时长、错误多的问题,按照5M1E质量管理思路,结合铁路货运作业主要安全风险环节,系统分析铁路货运安全风险影响因素,基于博德和罗夫特斯构建的事故致因链模型,提出基于5M1E的铁路货运事故致因模型,运用Apriori算法对影响因素、动作状态、事故隐患进行关联分析,基于S铁路公司2017—2018年货运安全事故及险兆事件信息,得出铁路货运系统安全事故及影响因素关联规则,为铁路货运安全风险精准识别与管控提供参考。与当前按字段筛选、查找、统计的风险关联分析方法相比,大幅减少管理人员风险评估工作强度,极大提升铁路货运安全风险识别与防控能力。

关键词：铁路货运作业安全风险事故致因关联推理关联规则

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超宽带低损耗带状线-共面波导垂直互联设计

太赫兹科学与电子信息学报 2024年第10期22卷 1051-1055+1062页

作者：郑磊金颖康清华大学工程物理系同方威视技术股份有限公司北京神目科技有限公司

随着电子技术向更高集成度和小型化发展，三维电路布局日益普及，其中毫米波信号在表层与内部电路间的有效传输变得尤为关键。本研究设计了一种新型超宽带低损耗的带状线-共面波导垂直互联结构，以应对互联结构中寄生电感和电容引起的... 详细信息

随着电子技术向更高集成度和小型化发展，三维电路布局日益普及，其中毫米波信号在表层与内部电路间的有效传输变得尤为关键。本研究设计了一种新型超宽带低损耗的带状线-共面波导垂直互联结构，以应对互联结构中寄生电感和电容引起的信号反射和辐射问题。通过等效电路模型分析和参数初步设计，结合三维场仿真优化，确定了最终设计参数。该互联结构采用0.2 mm直径的通孔实现连接，并具有仅0.8 mm直径的隔离环，保证了结构的简洁性和易于加工的特点。仿真结果表明，该设计可实现DC～80 GHz的宽带覆盖，S11小于-13 dB,S21大于-0.4 dB，显示出优异的性能。为了匹配测试系统，设计了测试板转换至同轴接口的转换结构，使其工作频率达到40 GHz。实际测试结果显示，在DC～40 GHz范围内，回波损耗小于11 dB，插入损耗小于0.4 dB，进一步验证了设计的有效性和实用性。

关键词：超宽带垂直互联带状线-共面波导低损耗小尺寸

STrUCTUrAL CHArACTErISTICS OF THE NIUSHOU MOUNTAIN AND ITS GEOLOGICAL SIGNIFICANCE IN CENTrAL NINGXIA

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Geotectonica et Metallogenia 2003年第Z1期 165-178页

作者： ZHANG jin, MA Zongjin, rEN Wenjun and lei Yongliang (School of Earth and Space Sciences, peking University, Beijing 100871, china department of Geophysical Survey, Changqing Oil Field company, Wuzhong, NX 751104, china)

There are many thrust-related structures occurring in the paleozoic strata of the Niushou Mountain in the central part of Ningxia Hui Autonomous region. The fault-related folds are the typical structures in this area. Based on the analysis about these structures and their relationships, the processes by which these structures of the Miboshan Formation were formed are reconstructed, and the strata underwent about three stages of deformation: (1) horizontal shortening, (2) folding, and (3) thrusting. And the fact that the Niushou Mountain is the leading edge of an old thrust sheet was proved, the Niushou Mountain, the Daluo Mountain and the Xiaoluo Mountain together constitute the front part of this old thrust zone, so the Niushou Mountain and the Ordovician strata in the central and southern parts of Ningxia now are likely allochthons. In the period from middle Ordovician to Devonian, the areas of the central and southern Ningxia belonged to the back-arc foreland basin of North Qilianshan orogen, which w

关键词： the Niushou Mountain fault-related fold cleavage

Local events-based fast rTM surface-offset gathers via dip-guided interpolation

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petroleum Science 2021年第3期18卷 773-782页

作者： Yang Zhao Feng-Lin Niu lei Fu Cheng Cheng jin-Hong Chen Shou-Dong Huo State Key Laboratory of petroleum resources and prospecting Unconventional Petroleum Research InstituteChina University of PetroleumBeijing 100083China department of Earth Environmental and Planetary SciencesRice UniversityHoustonTXUSA department of Earth and planetary Science University of CaliforniaBerkeleyCAUSA Aramco research Center Aramco Services CompanyHoustonTXUSA Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

reverse Time Migration(rTM)Surface Ofset Gathers(SOGs)are demonstrated to deliver more superior residual dip information than ray-based *** appears more powerful in complex geological settings,such as salt ***,the computational cost of constructing rTM SOGs is a big challenge in applying it to 3D feld *** tackle this challenge,we propose a novel method using dips of local events as a guide for rTM gather *** residual-dip information of the SOGs is created by connecting local events from depth-domain to time-domain via ray *** proposed method is validated by a synthetic experiment and a feld *** mitigates the computational cost by an order of magnitude while producing comparable results as fully computed rTM SOGs.

关键词： Surface-ofset gathers reverse-time migration Dip-guided interpolation reduced costs Local-event raytracing

Tight gas production model considering TpG as a function of pore pressure,permeability and water saturation

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petroleum Science 2020年第5期17卷 1356-1369页

作者： Atif Zafar Yu-Liang Su lei Li jin-Gang Fu Asif Mehmood Wei-ping Ouyang Mian Zhang School of petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina department of petroleum Technology University of KarachiUniversity RoadKarachi 75270Pakistan Changqing Downhole Technology company Chuangqing Drilling Engineering Co.LtdCNPCXi’an 710018ShaanxiChina

Threshold pressure gradient has great importance in efficient tight gas field development as well as for research and laboratory *** experimental study is carried out to investigate the threshold pressure gradient in *** are carried out with and without back pressure so that the effect of pore pressure on threshold pressure gradient may be *** trend of increasing or decreasing the threshold pressure gradient is totally opposite in the cases of considering and not considering the pore *** results demonstrate that the pore pressure of tight gas reservoirs has great influence on threshold pressure *** effects of other parameters like permeability and water saturation,in the presence of pore pressure,on threshold pressure gradient are also examined which show that the threshold pressure gradient increases with either a decrease in permeability or an increase in water *** new correlations of threshold pressure gradient on the basis of pore pressure and permeability,and pore pressure and water saturation,are also *** on these equations,new models for tight gas production are *** gas slip correction factor is also considered during derivation of this proposed tight gas production *** performance relationship curves based on these proposed models show that production rates and absolute open flow potential are always be overestimated while ignoring the threshold pressure gradients.

关键词： Inflow performance relationship pore pressure Threshold pressure gradient Tight gas field development Tight gas sand reservoir

A new model for predicting irreducible water saturation in tight gas reservoirs

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petroleum Science 2020年第4期17卷 1087-1100页

作者： Yu-Liang Su jin-Gang Fu lei Li Wen-Dong Wang Atif Zafar Mian Zhang Wei-ping Ouyang School of petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina department of petroleum Technology University of KarachiKarachiPakistan Changqing Downhole Technology company Chuanqing Drilling Engineering Co.LtdCNPCXi’an 710018ShaanxiChina

The irreducible water saturation(Swir) is a significant parameter for relative permeability prediction and initial hydrocarbon reserves ***,the complex pore structures of the tight rocks and multiple factors of the formation conditions make the parameter difficult to be accurately predicted by the conventional methods in tight gas *** this study,a new model was derived to calculate Swir based on the capillary model and the fractal *** model incorporated different types of immobile water and considered the stress *** dead or stationary water(DSW) was considered in this model,which described the phenomena of water trapped in the dead-end pores due to detour flow and complex pore *** water film,stress effect and formation temperature were also considered in the proposed *** results calculated by the proposed model are in a good agreement with the experimental *** proves that for tight sandstone gas reservoirs the Swir calculated from the new model is more *** irreducible water saturation calculated from the new model reveals that Swir is controlled by the critical capillary radius,DSW coefficient,effective stress and formation temperature.

关键词： Fractal theory Stress dependence effect Capillary model Tight sandstone gas reservoir Irreducible water saturation

Global and regional controls on carbon-sulfur isotope cycling during SpICE event in south china

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Frontiers of Earth Science 2023年第3期17卷 713-726页

作者： Xianfeng TAN Long LUO Hongjin CHEN Jon GLUYAS Zihu ZHANG Chensheng jin Lidan lei Jia WANG Qing CHEN Meng LI State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 403374China Chongqing Key Laboratory of Complex Oil and Gas Exploration and Development Chongqing University of Science and TechnologyChongqing 401331China Shunan Gas Field PetroChina Southwest Oil and Gas Field CompanyLuzhou 646000China department of Earth Sciences Durham UniversityDurhamDH13LEUK State Key Laboratory of Oil and Gas reservior Geology and Exploration Chengdu University of TechnologyChengdu 610059China Yunnan Key Laboratory for paleobiology Yunnan UniversityKunming 650091China School of Geographical Sciences Southwest UniversityChongqing 400715China

The positive S-isotopic excursion of carbonate-associated sulfate(δ34S_(CAS))is generally in phase with the Steptoean positive carbon isotope excursion(SpICE),which may reflect widespread,global,transient increases in the burial of organic carbon and pyrite sulfate in sediments deposited under large-scale anoxic and sulphidic ***,carbon-sulfur isotope cycling of the global SpICE event,which may be controlled by global and regional events,is still poorly understood,especially in south ***,theδ13CpDB,δ18OpDBδ34S_(CAS),total carbon(TC),total organic carbon(TOC)and total sulfate(TS)of Cambrian carbonate of Waergang section of Hunan province were analyzed to unravel global and regional controls on carbon-sulfur cycling during SpICE event in south ***δ34S_(CAS)values in the onset and rising limb are not obviously higher than that in the preceding SpICE,meanwhile sulfate(δ34S_(CAS))isotope values increase slightly with increasingδ13CpDB in rising limb and near peak of SpICE(130–160 m).The sulfate(δ34S_(CAS))isotope values gradually decrease from 48.6‰to 18‰in the peak part of SpICE and even increase from 18%to 38.5%in the descending limb of *** abnormal asynchronous C−S isotope excursion during SpICE event in the south china was mainly controlled by the global events including sea level change and marine sulfate reduction,and it was also influenced by regional events such as enhanced siliciclastic provenance input(sulfate),weathering of a carbonate platform and sedimentary *** environment and lithology are not the main reason for global SpICE event but influence theδ13CpDB excursion-amplitude of *** level eustacy and carbonate platform weathering probably made a major contribution to theδ13CpDB excursion during the SpICE,in particularly,near peak of ***,the trilobite extinctions,anoxia,organic-matter burial and siliciclastic provenance input also play an important role in the onset,early and late st

关键词： sulfate isotope excursion terrigenous matter carbonate platform weathering sea level change transitional slope environment Waergang section

preparation of high-affinity rabbit monoclonal antibodies for ciprofloxacin and development of an indirect competitive ELISA for residues in milk

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第10期11卷 812-818页

作者： Bin HUANG Yun YIN lei LU Hai DING Lin WANG Ting YU Jia-jin ZHU Xiao-dong ZHENG Yan-zhen ZHANG department of Food Science and Nutrition Zhejiang University Hangzhou 310029 China department of Stomatology the Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 China Yikang Biotechnology company Hangzhou 310029 China

A convenient competitive enzyme-linked immunosorbent assay(ELISA) for ciprofloxacin(CpFX) was developed by using rabbit monoclonal antibodies(rabMAbs) against a hapten-protein conjugate of CpFX-bovine serum albumin(BSA).The indirect competitive ELISA of CpFX had a concentration at 50% inhibition(IC50) of 1.47 ng/ml and a limit of detection(LOD) of 0.095 ng/*** mAb exhibited some cross-reactivity,however,not so high with enrofloxacin(28.8%),ofloxacin(13.1%),norfloxacin(11.0%),fleroxacin(22.6%),and pefloxacin(20.4%).And it showed almost no cross-reactivity with other antibiotics or sulfonamides evaluated in this *** competitive ELISA kit developed here could be used as a screening tool to detect and control illegal addition of CpFX in food *** kit had been applied to milk detection and the recovery rates from samples spiked by CpFX were in a range of 63.02%-84.60%,with coefficients of variation of less than 12.2%.

关键词： Ciprofloxacin Competitive enzyme-linked immunosorbent assay (ELISA) rabbit monoclonal antibody residues Cross-reactivity

YBa_2Cu_3O_(7-δ)超导厚膜在35GHz频率的毫米波表面电阻

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物理学报 1995年第4期44卷 646-652页

作者：吴柏枚蒋克寒王东进盛奕键杜英磊中国科学技术大学物理系合肥230026 中国科学技术大学科波高技术公司合肥230026 中国科学技术大学基础物理中心合肥230026

用银为隔离层、工作频率为35GHz和模式为TE_(011)的铜谐振腔研究YBa_2Cu_3O_(7_δ)超导厚膜的毫米波表面电阻。应用电泳技术在银衬底上沉积YBa_2Cu_3O_(7_δ)厚膜,经机械加工和精细的表面抛光后作为圆柱型腔的两端面。测量两瑞面为YBa_2... 详细信息

用银为隔离层、工作频率为35GHz和模式为TE_(011)的铜谐振腔研究YBa_2Cu_3O_(7_δ)超导厚膜的毫米波表面电阻。应用电泳技术在银衬底上沉积YBa_2Cu_3O_(7_δ)厚膜,经机械加工和精细的表面抛光后作为圆柱型腔的两端面。测量两瑞面为YBa_2Cu_3O_(7_δ)厚膜的腔和铜腔的Q值,计算得到35GHz,77K温度下YBa_2Cu_3O_(7_δ)导厚膜的表面电阻r_5为21.88mΩ,低于同样条件下纯铜的值。YBa_2Cu_3O_(7_δ)从正常态经过T_c进入超导态,穿透深度的变化导致腔的共振频率的增大为11MHz。讨论了YBa_2Cu_3O_(7_δ)的表面处理对r_5的影响。

关键词： YBCO 超导体表面电阻