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Identification and distribution of 13003 landslides in the northwest margin of Qinghai-Tibet Plateau based on human-computer interaction remote sensing interpretation

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China Geology 2024年第2期7卷 171-187页

作者： Wei Wang Yuan-dong Huang Chong Xu Xiao-yi Shao Lei Li Li-ye Feng Hui-ran Gao Yu-long Cui Shuai Wu zhi-qiang yang Kai Ma National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of Chin12eijing 100085China School of Emergency Management Science and Engineering University of Chinese Academy of SciencesBeijing 100049China School of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China School of Civil Engineering and Architecture Anhui University of Science and TechnologyHuainan 232001China No.3 Bureau of China Metallurgical Geology Bureau Taiyuan 030031China

The periphery of the Qinghai-Tibet Plateau is renowned for its susceptibility to ***,the northwestern margin of this region,characterised by limited human activities and challenging transportation,remains insufficiently explored concerning landslide occurrence and *** the planning and construction of the Xinjiang-Tibet Railway,a comprehensive investigation into disastrous landslides in this area is essential for effective disaster preparedness and mitigation *** using the human-computer interaction interpretation approach,the authors established a landslide database encompassing 13003 landslides,collectively spanning an area of 3351.24 km^(2)(36°N-40°N,73°E-78°E).The database incorporates diverse topographical and environmental parameters,including regional elevation,slope angle,slope aspect,distance to faults,distance to roads,distance to rivers,annual precipitation,and *** statistical characteristics of number and area of landslides,landslide number density(LND),and landslide area percentage(LAP)are *** authors found that a predominant concentration of landslide origins within high slope angle regions,with the highest incidence observed in intervals characterised by average slopes of 20°to 30°,maximum slope angle above 80°,along with orientations towards the north(N),northeast(NE),and southwest(SW).Additionally,elevations above 4.5 km,distance to rivers below 1 km,rainfall between 20-30 mm and 30-40 mm emerge as particularly susceptible to landslide *** study area’s geological composition primarily comprises Mesozoic and Upper Paleozoic *** fault and human engineering activities have different degrees of influence on landslide ***,the significance of the landslide database,the relationship between landslide distribution and environmental factors,and the geometric and morphological characteristics of landslides are *** landslide H/L ratios in the study area are

关键词： Landslides Human-computer interaction interpretation Landslide database Spatial distribution Earthquake Rainfall Human engineering activity Qinghai-Tibet Plateau Geological hazards survey engineering

Effect of Mn content on microstructure, tensile and impact properties of SA508Gr.4N steel for reactor pressure vessel

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Journal of Iron and Steel Research International 2020年第4期27卷 461-470页

作者： Xi-kou He zhi-qiang yang Zhen Wang Shi-bin Qiao Zheng-dong Liu Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China Technology Center of Ma’anshan Iron and Steel Co. Ltd.Ma’anshan 243000AnhuiChina

The effect of manganese(Mn)on the microstructure,tensile and impact properties of SA508Gr.4N steel has been experimentally *** influence of Mn content on the substructure of SA508Gr.4N steel was investigated using the scanning electron microscope,electron back-scattered diffractometer and transmission electron *** was found that the increased Mn content had a beneficial effect on both strength and *** of microstructure revealed smaller size of block and larger number of high-angle grain boundaries with higher Mn *** change of the ultimate tensile strength and toughness with increasing Mn content was attributed to the increased hardenability,the number of high-angle grain boundaries and the crack propagation path by the block refining.

关键词： Mn element SA508Gr.4N steel Microstructure Charpy impact toughness Substructure

Hot Deformation Behavior of SA508GR.4N Steel for Nuclear Reactor Pressure Vessels

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Journal of Iron and Steel Research International 2016年第12期23卷 1342-1348页

作者： Ning LIU Zheng-dong LIU Xi-kou HE zhi-qiang yang Long-teng MA Faculty of Materials Science and Engineering Kunming University of Science and Technology Institute for Special Steels Central Iron and Steel Research Institute

A hot compression experiment （1073 1473 K, strain rates of 0. 001-10 s -1 ） of SAS08GR. 4N low alloy steel was performed using a Gleeble-3800 thermal-mechanical simulator, and the hot deformation behavior of the steel was investigated by analyzing both the true stress true strain curves and its microstructures. The thermal de formation equation and hot deformation activation energy （Q） of SA508GR. 4N steel were obtained by regression with a classic hyperbolic sine function. The hot processing map of SAS08GR. 4N steel was also established. An empirical equation for the stress peak was described for practical applications. The SA508GR. 4N steel showed a critical Zener-Hollomon parameter （lnZc） for dynamic recrystallization （DRX） of 37.44, below which full DRX may occur. The sensitivity of the SA508GR. 4N steel increased linearly with test temperature, such that higher temperatures led to enhanced workability.

关键词： SA508GR. 4N steel dynamic recrystallization hot deformation equation hot processing map ZenerHollomon parameter

Constitutive modeling and critical strain of dynamic recrystallization in SA508Gr.4N steel for advanced pressure vessel materials

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Journal of Iron and Steel Research International 2018年第11期25卷 1189-1197页

作者： zhi-qiang yang Zheng-dong Liu Xi-kou He Shi-bin Qiao Chang-sheng Xie Institute for Special Steels Central Iron and Steel Research Institute GroupBeijing 100081China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

Using a Gleeble-1500D thermal-mechanical simulator,the hot-deformation behavior and critical strain in the dynamic recrystallization of SA508Gr.4N steel were investigated by compression tests from 1050 to 1250℃ with strain rates from 0.001 to 0.1 s^-***-strain curves were fitted by a nonlinear fitting *** on these tests,the flow stress constitutive equations of the work-hardening dynamical recovery period and dynamical recrystallization period Were established for SA508Gr.4N *** stress-strain curves of SA508Gr.4N steel predicted by the established models are in a good agreement with the experimental *** of ln θ -ε and --(a)(lnθ)/(a)ε-ε (where θ is the work-hardening rate and ε is true strain)were plotted from experimental data.A critical strain (εc)and a peak strain (εp)of dynamic recrystallization were obtained and exhibited a linear relationship,i.e.,εc =0.386ε*** predicted model of εc could be described by the equation of εc=1.604×10^-3Z^0.127.

关键词： SA508Gr.4N steel Hot deformation Constitutive modeling Critical strain Dynamic recrystallization

A comprehensive review on microchannel heat sinks for electronics cooling

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International Journal of Extreme Manufacturing 2024年第2期6卷 133-162页

作者： zhi-qiang Yu Mo-Tong Li Bing-yang Cao Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing 100084People’s Republic of China

The heat generation of electronic devices is increasing dramatically,which causes a serious bottleneck in the thermal management of electronics,and overheating will result in performance deterioration and even device *** the development of micro-machining technologies,the microchannel heat sink(MCHS)has become one of the best ways to remove the considerable amount of heat generated by high-power *** has the advantages of large specific surface area,small size,coolant saving and high heat transfer *** paper comprehensively takes an overview of the research progress in MCHSs and generalizes the hotspots and bottlenecks of this *** heat transfer mechanisms and performances of different channel structures,coolants,channel materials and some other influencing factors are ***,this paper classifies the heat transfer enhancement technology and reviews the related studies on both the single-phase and phase-change flow and heat *** comprehensive review is expected to provide a theoretical reference and technical guidance for further research and application of MCHSs in the future.

关键词： microchannel heat sink thermal management of electronics microscale heat transfer heat transfer enhancement

Association of serum complement C1q with cardiovascular outcomes among patients with acute coronary syndrome undergoing percutaneous coronary intervention

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Journal of Geriatric Cardiology 2022年第12期19卷 949-959,1007-1010页

作者： Qiu-Xuan LI Xiao-Teng MA Qiao-Yu SHAO zhi-qiang yang Jing LIANG Li-Xia yang Dong-Mei SHI Yu-Jie ZHOU zhi-Jian WANG Department of Cardiology Beijing Anzhen HospitalCapital Medical UniversityBeijing Institute of Heart Lung and Blood Vessel DiseaseBeijing Key Laboratory of Precision Medicine of Coronary Atherosclerotic DiseaseClinical Center for Coronary Heart DiseaseCapital Medical UniversityBeijingChina

OBJECTIVE To determine the association of serum complement C1q levels with cardiovascular outcomes among patients with acute coronary syndrome(ACS)undergoing percutaneous coronary intervention(PCI),and evaluate the value of C1q modified by high-sensitivity C-reactive protein(hs-CRP)levels as an independent *** As a single-center prospective observational study,we analyzed 1701 patients who had received primary or elective PCI for ACS at Beijing Anzhen Hospital,Capital Medical University,Beijing,China between June 1,2016 and November 30,*** associations of C1q modified by hs-CRP with major adverse cardiovascular events(MACE)were determined in survival *** Patients with the lowest C1q tertile had the highest cumulative risk of MACE(log-rank P=0.007).In fully adjusted Cox regression models,stratifying the total population according to hs-CRP dichotomy,C1q was significantly associated with MACE in patients with hs-CRP levels less than 2 mg/L but not in those with 2 mg/L or more(P_(interaction)=0.02).In patients with hs-CRP levels less than 2 mg/L,with the lowest C1q tertile as reference,the risk of MACE was reduced by 40.0%in the middle C1q tertile[hazard ratio(HR)=0.600,95%CI:0.423–0.852,P=0.004]and by 43.9%in the highest C1q tertile(HR=0.561,95%CI:0.375–0.840,P=0.005).CONCLUSIONS Serum complement C1q is significantly associated with cardiovascular outcomes in patients with ACS undergoing PCI,only when hs-CRP levels are less than 2 mg/*** finding implicates the usefulness of C1q for the risk stratification in ACS patients with reduced systemic inflammation.

关键词： C1q patients coronary

Inducible RNA targeting and N^(6)-methyladenosine editing by a split-Cas13 architecture

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Journal of Molecular Cell Biology 2024年第1期16卷 66-69页

作者： yang Li qiang Sun zhi yang Gang Yuan International Institutes of Medicine the Fourth Affiliated Hospital of Zhejiang University School of MedicineYiwu 322000China Department of Thoracic Surgery and Institute of Thoracic Oncology West China HospitalSichuan UniversityChengdu 610041China Future Health Laboratory Innovation Center of Yangtze River DeltaZhejiang UniversityJiaxing 314100China

Dear editor,Cas13,a class Ⅱ type Ⅵ CRISPR‒Cas endonuclease with two higher eukaryotes and prokaryotes nucleotide-binding(HEPN)domains,exclusively binds to and cleaves single-stranded RNA by a complementary guide RNA(gRNA)(Makarova et al.,2020).RfxCas13d(also known as CasRx)is an ortholog of CRISPR‒Cas13 with a relatively small size and robust RNA knockdown capability in mammalian cells(Konermann et al.,2018).Owing to its simplicity and high efficiency,CasRx has been applied for RNA targeting in various types of cells and ***,most of these studies failed to control the nuclease activity of CasRx *** re-engineered split-Cas9 system enables inducible genome editing and epigenetic modulation through chemical-induced reassembly of the Cas9 protein(Zetsche et al.,2015).However,tools that allow for efficient and controllable RNA knockdown by a split-Cas13 system remain to be established.

关键词： split system simplicity

Self-assembly Induced by Complexation of Diblock Copolyelectrolytes and Oppositely Charged Homopolymers

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Chinese Journal of Polymer Science 2024年第9期42卷 1321-1332,I0006页

作者： Ling Zhao zhi-Yuan Yin Jia-Di Jiang Er-qiang Chen Shuang yang Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCenter for Soft Mater Science and EngineeringCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China

We investigate the solution self-assembly of a mixture of positively charged homopolymers and AB diblock copolymers,in which the A blocks are negatively charged,and the B blocks are *** electrostatic complexation between oppositely charged polymers drives the formation of many ordered *** microstructures and phase diagrams are calculated using self-consistent field theory(SCFT)based on an ion-pair model with an equilibrium constant K to characterize the strength of binding between positively and negatively charged *** effects of the charge ratio,representing the ratio of charges from the homopolymer over all charges from polymers in the system,on the ordered structure are systematically studied,both for hydrophobic and hydrophilic A *** charge ratio plays an important role in determining the phase boundaries in the phase diagram of salt concentration versus polymer *** also provide information about the varying tendency of the domain spacing and core size of the spherical phase when the charge ratio is changed,and the results are in good agreement with *** studies provide a deep understanding of the self-assembled microstructures of oppositely charged diblock copolymer-homopolymer systems.

关键词： Self-assembly Polyelectrolyte complexation Self-consistent field theory Ion-pair

Uncertainty and sensitivity analysis of in-vessel phenomena under severe accident mitigation strategy based on ISAA-SAUP program

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Nuclear Science and Techniques 2024年第1期35卷 108-123页

作者： Hao yang Ji-Shen Li zhi-Ran Zhang Bin Zhang Jian-qiang Shan School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

The phenomenology involved in severe accidents in nuclear reactors is highly ***,integrated analysis programs used for severe accident analysis heavily rely on custom empirical parameters,which introduce considerable ***,in recent years,the field of severe accidents has shifted its focus toward applying uncertainty analysis methods to quantify uncertainty in safety assessment programs,known as“best estimate plus uncertainty(BEPU).”This approach aids in enhancing our comprehension of these programs and their further development and *** study concentrates on a third-generation pressurized water reactor equipped with advanced active and passive mitigation *** an Integrated Severe Accident Analysis Program(ISAA),numerical modeling and uncertainty analysis were conducted on severe accidents resulting from large break loss of coolant *** uncertainty parameters of the ISAA program were meticulously *** Wilks'formula,the developed uncertainty program code,SAUP,was employed to carry out Latin hypercube sampling,while ISAA was employed to execute batch *** analysis was then conducted on two figures of merit,namely hydrogen generation and the release of fission products within the pressure *** calculations revealed that hydrogen production and the fraction of fission product released exhibited a normal distribution,ranging from 182.784 to 330.664 kg and from 15.6 to 84.3%,*** ratio of hydrogen production to reactor thermal power fell within the range of 0.0578–0.105.A sensitivity analysis was performed for uncertain input parameters,revealing significant correlations between the failure temperature of the cladding oxide layer,maximum melt flow rate,size of the particulate debris,and porosity of the debris with both hydrogen generation and the release of fission products.

关键词： Gen-III PWR Severe accident mitigation Wilks’formula Hydrogen Fission products Uncertainty and sensitivity analysis