检索结果-南通市图书馆

Selection method of risk response schemes for mining project based on fuzzy preference relations

在线全文

学校读者我要写书评

暂无评论

Journal of Coal Science & Engineering(China) 2010年第2期16卷 221-224页

作者： SUN bing luo Hai-tao School of Management Liaoning Technical University Fuxin 123000 China

To overcome the subjectivity of experts in the process of risk response scheme selection, according to the theory of group decision making, a selection method and flow of the risk response schemes for a mining project was proposed based on fuzzy preference relation and consistency induced ordered weighted averaging (C-IOWA) operator,which can overcome the loss of information in the process of group decision making to a great degree, and improve its efficiency and quality.A numeric example was introduced to illustrate the application of the method, also validating the method as scientific and practicable.

关键词： mining project risk response scheme fuzzy preference relation C-IOWA operator

Effect of modifying matrix microstructures and nanosized precipitates on strengthening mechanisms and ductile-to-brittle-transitiontemperature in a 1000 MPa Ni-Cr-Mo-Cu steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第8期29卷 1257-1276页

作者： Fei Zhu Li Yang Feng Chai Xiao-bing luo Cai-fu Yang Zheng-yan Zhang Department of Structural Steels Central Iron and Steel Research InstituteBeijing 100081China Material Digital R&D Center China Iron and Steel Research Institute GroupBeijing 100081China

A superior combination of yield strength(1001 MPa)and-20℃ impact toughness(166 J)was obtained in Nb-V-Timicroalloyed Ni-Cr-Mo-Cu steel treated by direct quenching and tempering route(DQT).The tested steels treated by DQT route and re-austenitization and tempering route(QT)were compared with each other in terms of mechanical properties and microstructures characterized by optical microscopy,transmission electron microscopy,X-ray diffraction,electron back-scattered diffraction method and so *** and Vickers hardness of the tested steel treated by the above two routes vary with isothermal aging temperature(400-600℃),shown as under-aged state,peak-aged state and overaged *** DQT specimens show higher strength and Vickers hardness than QT specimens with the same aging ***,the largest difference of yield strength between DQT and QT specimens was shown in DQT600 and QT600 ***600 or QT600 specimens refers to direct quenched(DQ)or quenched(Q)specimens isothermally aged at 600℃.The main disparities in quenched microstructure between DQ and Q specimens are mainly in morphology of prior austenite grains,dislocation density of martensite matrix and solution amount of Nb and Mo elements dissolving in martensite matrix,which play key roles in affecting microstructure and mechanical properties of DQT and QT *** dislocation density of matrix and finer average diameter of both MC(M is any combination of Nb,Mo and V)and Cu-rich particles were shown in DQT600 specimens than in QT600 *** from dislocations and nanosized MC and Cu-rich particles mainly leads to the largest difference of yield strength between DQT600 and QT600 *** addition,strong dislocation strengthening and precipitation strengthening in DQT600 specimen also elevated its ductile-to-brittle-transition-temperature,compared with QT600 specimen.

关键词： Cu-bearing high-strength low-alloy steel Direct quenching Nanosized precipitate Strengthening Ductile-to-brittle-transition-temperature

Effects of Cu on Corrosion Resistance of Low Alloyed Steels in Acid Chloride Media

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2014年第6期21卷 619-624页

作者： Hang SU Xiao-bing luo Cai-fu YANG Feng CHAI Hao LI Institute for Engineering Steel Central Iron and Steel Research Institute

The corrosion resistance of two kinds of low alloyed steels was studied according to the test procedures for qualification of corrosion resistant steel for cargo oil tanks issued by International Maritime Organization. The results indicated that the addition of Cu improved the corrosion resistance of the NS-D36 steel to more than three times that of the conventional D36 steel in the strong acid solution containing chloride （10% NaC1, pHi0.85）. The anodic polarization behavior of the copper-bearing steel was studied by polarization curves and electrochemical impedance spectroscopy （EIS）, and alloying element Cu showed beneficial effects including an active potential range, low current density and high transfer resistance of electric charge. The rust layer was analyzed by scanning electron microscopy （SEM） and Auger electron spectroscopy （AES）, and the results pointed out that the mechanism of copper＇s benefi cial effects was based on the suppression of anodic dissolution by metallic copper re-deposition on the steel surface immersed in the strong acid chloride media.

关键词： low alloyed steel acid chloride media corrosion copper deposition

Global Existence and Blow up for Damped Generalized Boussinesq Equation

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2017年第1期33卷 251-262页

作者： Run-zhang XU Yong-bing luo Ji-hong SHEN Shao-bin HUANG College of Science Harbin Engineering University Harbin 150001 China College of Automation Harbin Engineering University Harbin 150001 China College of Computer Science and Technology Harbin Engineering University Harbin 150001 China

We study the Cauchy problem of damped generalized Boussinesq equation utt - uxx ＋（uxx＋ f（u））xx - αuxxt = 0. First we give the local existence of weak solution and smooth solution. Then by using potential well method and convexity method we prove the global existence and finite time blow up of solution, then we obtain some sharp conditions for the well-posedness problem.

关键词： generalized Boussinesq equation damping Cauchy problem global existence blow up

Polymorphisms of Epstein-Barr virus BHRF1 gene, a homologue of bcl-2

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer 2010年第12期29卷 1000-1005页

作者： Yong-Zheng Jing Yun Wang Yu-Ping Jia bing luo Department of Microbiology Qingdao University Medical College Qingdao Shandong 266021 P. R. China Department of Clinical Laboratory Municipal Hospital of Penglai Penglai Shandong 265600 P. R. China

Background and Objective: EBV BamHI fragment H rightward open reading frame 1 (BHRF1), the Epstein-Barr virus (EBV) early gene, is structurally and functionally homologous to the oncogene bcl-2 and may play an important role in the development of EBV-associated tumors. To characterize the polymorphisms of BHRF1 in EBV-associated tumors, we analyzed the sequences of BHRF1 in isolates from nasopharyngeal carcinoma (NPC) and EBV-associated gastric carcinoma (EBVaGC) biopsies as well as throat washing (TW) samples from healthy donors. Methods: BHRF1 DNA sequences were analyzed by polymerase chain reaction (PCR) and sequencing for 39 NPC samples, 40 EBVaGC samples, and 53 EBV-positive TW samples from healthy donors. The variants of BHRF1 gene were classified according to the signature changes. The EBV types 1 and 2 at nuclear antigen (EBNA) 3C locus were determined by PCR. Results: Compared with EBV standard cell line B95-8, all isolates carried a silent mutation at amino acid (AA) 80 (nucleotide 54616 T→C), the AA88 L→V mutation was found in most isolates, and the AA79 V→L mutation in a few isolates. Other mutations were sporadically distributed. Based on the mutations at AA88 and AA79, 3 distinct variants of BHRF1 genes, designated as 79V88V, 79L88L, and 79V88L, were identified. The 79V88V was the most common variant. The distribution of the BHRF1 variants among the NPC, EBVaGC, and TW samples was not significant. The corresponding regions of bcl-2 homologues were conserved in all isolates except for 3 samples. The distribution of BHRF1 variants in type 1 and type 2 strains was significant different (P < 0.001, contingency coefficient was 0.554). Conclusions: The 79V88V is the dominant variant in NPC, EBVaGC, and TW samples from healthy donors and preferential linkages between BHRF1 and EBNA3C variants exist. Conserved BHRF1 in Bcl-2 homologous domains is helpful to remain the important role of BHRF1.

关键词： EB病毒早期基因同源基因多态性全国人民代表大会基因突变开放阅读框架聚合酶链反应

Characterizing the maturity of highly evolved organic matter based on aromatic hydrocarbons and optimization with pyrobitumen reflectance and Raman spectral parameters

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2022年第12期65卷 2335-2357页

作者： Zhaoxi ZUO Jian CAO Wenxuan HU Chunhua SHI Xiaolin WANG Suping YAO bing luo State Key Laboratory for Mineral Deposits Research School of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China Chongqing Gas Field of PetroChina Southwest Oil and Gas Field Company Chongqing 401120China

Maturity evaluation of highly evolved organic matter is an important problem in oil and gas geochemistry,because conventional organic geochemical proxies are not applicable due to hydrocarbon generation and *** this study,we investigated the pyrobitumen in the reservoirs of the Sinian Dengying Formation in the Sichuan Basin,*** focused on aromatic hydrocarbon biomarkers,and the calibration and application of aromatic maturity proxies using pyrobitumen reflectance and Raman spectral *** results show that only the thiophene compounds are effective maturity indicators,such as MDR(4-/1-MDBT),MDR′(4-MDBT/(1-MDBT+4-MDBT)),MDR1(1-MDBT/DBT),4,6-/(1,4+1,6)-DMDBT,(2,6+3,6)-/(1,4+1,6)-DMDBT,and[2,1]BNT/([2,1]BNT+[1,2]BNT),as these are largely independent of the optical anisotropy of *** condensation and incorporation of thiophene compounds can lead to an increase in the reflectance of pyrobitumen,which means the thiophene compound parameters are positively or negatively correlated with pyrobitumen *** potential maturity parameters were proposed,including DMDBTs/MDBTs,TeMDBTs/(DBT+MDBTs+DMDBTs+TMDBTs+TeMDBTs),1-MDBT/MDBTs,and[2,1]BNT/*** method and these parameters are universally applicable to maturity characterization,especially in rocks that lack vitrinite,contain strongly anisotropic organic matter,and have high contents of thiophene compounds.

关键词： Maturity characterization of high-evolution organic matter Reservoir pyrobitumen Optical texture Dengying Formation Sichuan Basin

A simulation study of a windowless gas-stripping room in an E//B neutral particle analyzer

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2021年第7期32卷 22-30页

作者： Yuan luo Wei-Ping Lin Pei-Pei Ren Guo-Feng Qu Jing-Jun Zhu Xing-Quan Liu Xiao-bing luo Zhu An Roy Wada Lin-Ge Zang Yu-Fan Qu Zhong-bing Shi Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China Cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA School of Physics Henan Normal UniversityXinxiang 453007China Southwestern Institute of Physics Chengdu 610064China

The neutral particle analyzer(NPA)is one of the crucial diagnostic devices in a Tokamak *** stripping unit is one of the main parts of the NPA.A windowless gas-stripping room with two differential pipes has been constructed in a parallel electric and magnetic fields(E//B)*** pressure distributions in the stripping chamber are simulated by ANSYS Fluent together with MolFlow+.Based on the pressure distributions obtained from the simulation,the stripping efficiency of the E//B NPA is studied using *** reaction physics is modified to track the charge state of each particle in a cross-section-based method in *** transmission rates(R)and stripping efficiencies f_(+1)are examined for particle energies ranging from 20 to 200 keV with the input pressure(P_(0)),ranging from 20 to 400 *** to the combined global efficiency,R×f_(+1),P_(0)=240 Pa is obtained as the optimum pressure for the maximum global efficiency in the incident energy range investigated.

关键词： Neutral particle analyzer Windowless gas-stripping chamber Stripping efficiency Ansys Fluent MolFlow+ GEANT4

基本动作技能对孤独症谱系障碍儿童的干预研究

在线全文

学校读者我要写书评

暂无评论

当代体育科技 2024年第23期14卷 9-13,45页

作者：张敏婷陈世琼骆冰阮辉龙碧波北京师范大学海口附属学校海南海口570100 海口市长彤学校海南海口570300 海南师范大学体育学院海南海口571158

对孤独症儿童进行为期10周的基本动作技能实验干预,探究体育干预对孤独症儿童基本动作技能提高的有效性。选取某大型儿童心理康复中心学龄1班、2班和3班的24名6~12岁孤独症儿童为实验对象。采用TGMD-3量表作为基本动作技能的测试指标。... 详细信息

对孤独症儿童进行为期10周的基本动作技能实验干预,探究体育干预对孤独症儿童基本动作技能提高的有效性。选取某大型儿童心理康复中心学龄1班、2班和3班的24名6~12岁孤独症儿童为实验对象。采用TGMD-3量表作为基本动作技能的测试指标。通过数据分析可知,有效的体育干预可以显著提高孤独症儿童的基本动作技能,改善其身体素质和延缓运动动作障碍的发展速度,帮助患儿更好地融入社会。

关键词：孤独症儿童基本动作技能体育干预 TGMD

维普期刊数据库博看期刊

血清降钙素原、脑钠肽、N末端脑钠肽前体水平对慢性阻塞性肺疾病急性加重期患者合并心力衰竭的诊断价值研究

在线全文

学校读者我要写书评

暂无评论

实用心脑肺血管病杂志 2024年第6期32卷 68-71页

作者：孙静茹汪平罗兵徐素仿安徽省第二人民医院检验科安徽省合肥市230012

目的分析血清降钙素原(PCT)、脑钠肽(BNP)、N末端脑钠肽前体(NT-proBNP)水平对慢性阻塞性肺疾病急性加重期(AECOPD)患者合并心力衰竭(HF)的诊断价值。方法回顾性选取2021年1月至2023年1月安徽省第二人民医院收治的AECOPD患者106例为研... 详细信息

目的分析血清降钙素原(PCT)、脑钠肽(BNP)、N末端脑钠肽前体(NT-proBNP)水平对慢性阻塞性肺疾病急性加重期(AECOPD)患者合并心力衰竭(HF)的诊断价值。方法回顾性选取2021年1月至2023年1月安徽省第二人民医院收治的AECOPD患者106例为研究对象。根据合并HF情况,将患者分为AECOPD组(43例)和AECOPD合并HF组(63例)。比较两组一般资料、实验室检查指标、肺功能指标,采用ROC曲线分析血清PCT、BNP、NT-proBNP水平及其联合对AECOPD患者合并HF的诊断价值。结果AECOPD合并HF组血清PCT、BNP、NTproBNP水平高于AECOPD组(P<0.05)。ROC曲线分析结果显示,血清PCT、BNP、NT-proBNP水平诊断AECOPD患者合并HF的AUC分别为0.706〔95%CI(0.623~0.845)〕、0.823〔95%CI(0.726~0.924)〕、0.837〔95%CI(0.715~0.987)〕,三者联合诊断AECOPD患者合并HF的AUC为0.913〔95%CI(0.851~0.958)〕。结论血清PCT、BNP、NT-proBNP水平均对AECOPD患者合并HF具有一定诊断价值,而三者联合对其有较高的诊断价值。

关键词：肺疾病,慢性阻塞性心力衰竭降钙素原利钠肽,脑 N末端脑钠肽前体诊断