检索结果-南通市图书馆

Petroleum Science 2024年第4期21卷 2475-2484页

作者： Liang xue Shuai xu Jie Nie Ji Qin Jiang-Xia Han Yue-tian Liu Qin-Zhuo Liao State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum (Beijing) Department of Oil-Gas Field Development Engineering College of Petroleum Engineering China University of Petroleum (Beijing) Chuanqing Drilling Engineering Co.Ltd. China National Petroleum Corporation

The shale gas development process is complex in terms of its flow mechanisms and the accuracy of the production forecasting is influenced by geological parameters and engineering parameters. Therefore, to quantitatively evaluate the relative importance of model parameters on the production forecasting performance, sensitivity analysis of parameters is required. The parameters are ranked according to the sensitivity coefficients for the subsequent optimization scheme design. A data-driven global sensitivity analysis(GSA) method using convolutional neural networks(CNN) is proposed to identify the influencing parameters in shale gas production. The CNN is trained on a large dataset, validated against numerical simulations, and utilized as a surrogate model for efficient sensitivity analysis. Our approach integrates CNN with the Sobol' global sensitivity analysis method, presenting three key scenarios for sensitivity analysis: analysis of the production stage as a whole, analysis by fixed time intervals, and analysis by declining rate. The findings underscore the predominant influence of reservoir thickness and well length on shale gas production. Furthermore, the temporal sensitivity analysis reveals the dynamic shifts in parameter importance across the distinct production stages.

关键词： Shale gas Global sensitivity Convolutional neural network Data-driven

METTL1 promotes colorectal cancer cell proliferation by attenuating CHEK2-induced G1/S phase arrest

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Genes & Diseases 2024年第2期11卷 579-581页

作者： Houxiang Jiang Ying Liu Huibin Song Jinquan Xia Ying tian Luolin Wang Mingwei Li Zhenyu xu Zhenglei xu Chang Zou Department of Gastrointestinal Surgery The First Affiliated Hospital of Wannan Medical College (Yijishan Hospital of Wannan Medical College)WuhuAnhui 241001China Anhui Province Clinical Research Center for Critical Respiratory Medicine WuhuAnhui 241001China Department of Clinical Medical Research Center The Second Clinical Medical College (Shenzhen People's Hospital) of Jinan UniversityThe First Affiliated Hospital of Southern University of Science and TechnologyShenzhenGuangdong 518020China Integrated Chinese and Western Medicine Postdoctoral Research Station Jinan UniversityGuangzhouGuangdong 510632China School of Pharmacy Southwest Medical UniversityLuzhouSichuan 646000China Department of Gastroenterology Shenzhen People's Hospital(The Second Clinical Medical CollegeJinan UniversityThe First Affiliated HospitalSouthern University of Science and Technology)ShenzhenGuangdong 518020China Precision Medicine Center The First Affiliated Hospital of Wannan Medical College(Yijishan Hospital of Wannan Medical College)WuhuAnhui 241001China School of Medicine Life and Health SciencesThe Chinese University of Hong KongShenzhenGuangdong 518172China

Colorectal carcinoma(CRC),the third most commonly diagnosed cancer,accounts for 9.7%of all newly diagnosed cancer cases and 9.4%of cancer-related deaths globally.1 Recent studies have demonstrated that post-transcriptional RNA modifications,such as N^(6)-methyladenosine,N^(5)-methylcytosine,and N^(7)-methylguanosine,play critical roles in the regulation of mRNA stability and translation,primary microRNA processing,and lncRNA-protein complex that contributes to the progression of human cancer.

关键词： cancer colorectal globally

Design of Fully Automatic Specification Selection System for Resistance Welding Equipment

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 Harbin Institute of Technology(New Series) 2024年第1期31卷 64-68页

作者： Xiangkun Lu Zengtai tian Hao xu Yue Guo The 707 Research Institute of CSSC Tianjin 300131China tianjin 707 HI-TECH CO. LTDTianjin 300409China

A system for fully automatic selection of welding specifications in resistance welding equipment has been developed to address the problem of workers frequently choosing the wrong specifications during manual welding of multiple parts on a single machine in automobile factories. The system incorporates an automatic recognition system for different workpiece materials using the added machine fixture,visual detection system for nuts and bolts,and secondary graphical confirmation to ensure the correctness of specification calling. This system achieves reliable,fully automatic selection of welding specifications in resistance welding equipment and has shown significant effects in improving welding quality for massproduced workpieces,while solving the problem of specification calling errors that can occur with traditional methods involving process charts and code adjustments. This system is particularly suitable for promoting applications in manual welding of multiple parts on a single machine in automobile factories,ensuring correct specification calling and welding quality.

关键词： seat spot welding welding specifications fully automatic

Boosting the catalytic performance of Cu-SAPO-34in NO_(x) removal via hydrothermal treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第1期135卷 640-655页

作者： Xiaoyan tian Huimin Wang Siyuan xu Lianyun Gao Jinyan Cao Jianjun Chen Qiulin Zhang Ping Ning Jiming Hao Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming University of Science and TechnologyKunming 650500China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing 100084China

Phosphate ions promoted Cu-SAPO-34(P-Cu-SAPO-34)were prepared using bulk CuO particles as Cu^(2+)precursor by a solid-state ion exchange technique for the selective catalytic reduction of NO_(x) with NH_3(NH_3-SCR).The effects of high temperature(H-T)hydrothermal aging on the NO_(x) removal(de-NO_(x))performance of Cu-SAPO-34 with and without phosphate ions were systematically investigated at atomic *** results displayed that both Cu-SAPO-34 and P-Cu-SAPO-34 presented relatively poor NO_(x) removal activity with a low conversion(les showed significantly satisfied NO_(x) elimination performance with a quite high conversion(70%-90%)at 250-500℃.Additionally,phosphate ions decoration can further enhance the catalytic performance of Cu-SAPO-34 after hydrothermal treatment(Cu-SAPO-34H).The textural properties,morphologies,structural feature,acidity,redox characteristic,and surface-active species of the fresh and hydrothermally aged samples were analyzed using various characterization *** systematical characterization results revealed that increases of 28%of the isolated Cu^(2+)active species(Cu^(2+)-2Z,Cu(OH)^(+)-Z)mainly from bulk CuO and 50%of the Bronsted acid sites,the high dispersion of isolated Cu^(2+)active component as well as the Bronsted acid sites were mainly responsible for the accepted catalytic activity of these two hydrothermally aged samples,especially for P-Cu-SAPO-34H.

关键词： NH_(3)-SCR Cu-SAPO-34 Hydrothermal induced Phosphate ions

Designing High-Porosity Porous Structures with Complex Geometries for Enhanced Thermal Conductivity Using Selective Laser Melting and Heat Treatment

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 2024年第5期37卷 808-824页

作者： Hulin Tang Xiang Zhang Chenping Zhang tian Zhou Shiyue Guo Gaopeng xu Rusheng Zhao Boyoung Hur xuezheng Yue School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200082China National Center for Stomatology National Clinical Research Center for Oral DiseasesShanghai Key Laboratory of StomatologyDepartment of Oral Maxillofacial-Head and Neck OncologyShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityShanghai 200011China Longzhong Lab Wuhan of Science and TechnologyYancheng 224000China Tokyo Metropolitan University TokyoJapan Gyeongsang National University JinjuKorea

Rapid advancements in the aerospace industry necessitate the development of unified,lightweight and thermally conductive *** complex geometries,including bionic and porous structures,is paramount in thermally conductive structures to attain improved thermal *** design of two high-porosity porous lattice structures was inspired by pomelo peel structure,using Voronoi parametric *** combining characteristic elements of two high-porostructuressity porous lattice structures designed,a novel high-porosity porous gradient structure is *** structure is based on gradient *** selective laser melting(SLM),fabrication comprises ***-state thermal characteristics are evaluated via finite element analysis(FEA).The experimental thermal conductivity measurements correlate well with simulation results,validating the sequence of K_L as the highest,followed by D_K_L and then D_*** treatment significantly improves thermal conductivity,enhancing the base material by about 45.6%and porous structured samples by approximately 43.7%.

关键词： Selective laser melting Porous lattice structure Thermal conductivity Heat treatment

Design and high-power testing of offline conditioning cavity for CiADS RFQ high-power coupler

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

Nuclear Science and Techniques 2024年第9期35卷 18-27页

作者： Ruo-xu Wang Yuan He Long-Bo Shi Chen-Xing Li Zong-Heng xue tian-Cai Jiang Xian-Bo xu Lie-Peng Sun Zhou-Li Zhang Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Lanzhou University Lanzhou 730000China

To validate the design rationality of the power coupler for the RFQ cavity and minimize cavity contamination,we designed a low-loss offline conditioning cavity and conducted high-power *** offline cavity features two coupling ports and two tuners,operating at a frequency of 162.5 MHz with a tuning range of 3.2 *** the installation angle of the coupling ring and the insertion depth of the tuner helps minimize cavity *** performed electromagnetic structural and multiphysics simulations,revealing a minimal theoretical power loss of 4.3%.However,when the cavity frequency varied by110 kHz,theoretical power losses increased to10%,necessitating constant tuner adjustments during *** simulations indicated that increased cavity temperature did not affect frequency *** completion of the offline high-power conditioning platform,we measured the transmission performance,revealing a power loss of 6.3%,exceeding the theoretical *** utilized efficient automatic range scanning and standing wave resonant *** fully condition the power coupler,a 15°phase difference between two standing wave points in the condition-ing system was ***,the maximum continuous wave power surpassed 20 kW,exceeding the expected target.

关键词： RFQ cavity Power coupler Offline conditioning Resonant cavity

Heterogeneous integration of 2D materials on Si charge-coupled devices as optical memory

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第6期67卷 190-197页

作者： Zheng BIAN Feng tian Zongwen LI Xiangwei SU tianjiao ZHANG Jialei MIAO Bin YU Yang xu Yuda ZHAO College of Integrated Circuits Hangzhou Global Scientific and Technological Innovation CentreZhejiang University

Optical memory integrates the function of optical sensing in memory devices, remarkably promoting the interconnection between sensory and memory terminals. Silicon charge-coupled photodetectors and floating gate memory have been widely used in imaging and storage technologies, respectively. However,the heterogeneous integration of the two devices requires technological innovation and complex electrical connections. In this work, we adopt a three-dimensional layer stacking method to design a novel optical memory device. On the top of Si charge-coupled photodetectors, we successively deposit two-dimensional graphene,hexagonal boron nitride, and molybdenum disulfide as a floating gate layer, a tunneling layer, and a readout layer, respectively. By applying a gate bias on lightly doped Si, a deep depletion layer is formed with a high voltage potential drop. Under dark conditions, the depletion layer cannot be filled, and the electric field across the h-BN tunnel barrier is relatively small. Under light irradiation, the deep depletion layer is gradually filled, and the h-BN tunneling layer withstands the increasing electric field, resulting in charge storage in the floating gate layer. Based on this mechanism, the device exhibits a gate voltage-dependent operation mode, including an integrated optical sensing-memory mode and an electrically driven storage mode. Under moderate gate voltage, the device can effectively detect the optical information with varied intensity and store the optical information in the floating gate, displaying optically controlled memory characteristics. Our work demonstrates a compact device structure for optical memory and displays excellent optically controlled memory performance, which can be applied in artificial vision systems.

关键词： heterogeneous integration charge-coupled device floating gate optical memory molybdenum disulfide lightly doped silicon

Bichromatically pumped artificial cnoidal wave breathers in optical microresonators

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2024年第7期12卷 1464-1477页

作者： YIRAN GAO JIAN DAI ZHONGHAN WU ANNI LIU tian ZHANG WEI SUN JUNQIU LIU KUN xu State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China School of Communication Engineering Hangzhou Dianzi UniversityHangzhou 310018China International Quantum Academy Shenzhen 518048China Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China

Breathers are localized structures that undergo a periodic oscillation in their duration and amplitude. Optical microresonators, benefiting from their high-quality factor, provide an ideal test bench for studying breathing phenomena. In a monochromatically pumped microresonator system, intrinsic breathing instabilities are widely observed in the form of temporal dissipative Kerr solitons which only exist in the effectively red-detuned ***, we demonstrate a novel bichromatic pumping scheme to create compulsive breathing microcombs via respectively distributing two pump lasers at the effectively blue-and red-detuned sides of a single *** experimentally discover the artificial cnoidal wave breathers and molecular crystal-like breathers in a photonic chip-based silicon nitride microresonator and theoretically describe their intriguing temporal dynamics based on the bichromatic pumping Lugiato–lefever equation. In particular, the corresponding breathing microcombs exhibit diverse comb line spacing ranging from 2 to 17 times the free spectral range of the *** discovery not only provides a simple yet robust method to harness microcombs with reconfigurable comb line spacing but also reveals a new class of breathing waves in driven dissipative nonlinear systems.

关键词： pumped resonator pumping

Acid-sensing ion channel:A new player in neural plasticity and neuroprotection

在线全文

学校读者我要写书评

暂无评论

Acid-sensing ion channel:A new player in neural plasticity a...

Protective effects of baffles with different positions,row spacings,heights on debris flow impact

中国神经科学学会第四次会员代表大会暨第七届全国学术会议

作者： tian-le xu Institute of Neuroscience,Key Laboratory of Neurobiology,Chinese Academy of Sciences,Shanghai 200031,China.

＜正＞Changes of extracellular pH values can have profound effects on neuronal *** example,the low pH （also called acidosis） generated in brain ischemia causes acute cell injury by depolarizing *** years the receptors that detect pH variations surrounding neurons and their physiological/pathological importance remain *** recent finding that acidosis activates a distinct family of membrane ion channels,the acid-sensing ion channels（ASICs） in both peripheral and central neurons has dramatically changed the view of acidosis-associated signaling and provided a new strategy for therapeutic *** proton is the only known agonist for the activation of ASICs,a variety of extracellular and intracellular signaling molecules can modulate the activities of ASICs and have profound influence on the functions of these channels in both physiological and pathological *** recent years,we have investigated the sensitization of ASICs in neurons from rat hippocampus and spinal dorsal horn to acidic conditions following global ischemia or peripheral *** found that the enhanced activity of ASICs as a result of elevated expression and phosphorylation of a specific ASIC subunit,ASIC 1 a,plays a critical role in spinal nociceptive plasticity and ischemic neuronal *** findings reveal that the ASIC is a new player in neural plasticity and neuroprotection.

关键词： Acidosis ASICs plasticity neuroprotection

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第7期21卷 2352-2367页

作者： SUN Xinpo CHEN Min BI Yuzhang ZHENG Lu CHE Chi xu Ao tian Zijian JIANG Zheyuan College of Civil Engineering Sichuan University of Science and EngineeringZigong 643000China College of Resources and Environment Fujian Agriculture and Forestry UniversityFuzhou 350002China School of Civil Engineering Fuzhou UniversityFuzhou 350108China Jiangsu Key Laboratory of Urban Underground Engineering&Environmental Safety Institute of Geotechnical EngineeringSoutheast UniversityNanjing 210096China Beijing Urban Construction Science Technology Promoting Association Beijing 100055China SUSE-BZ Geoenvironmental Engineering Joint Laboratory Sichuan University of Science and EngineeringZigong 643000China

The baffle effectively slowed down debris flow velocity,reduced its kinetic energy,and significantly shortened the distance of debris flow ***,they are widely used for protection against natural hazards such as landslides and *** study,based on the threedimensional DEM(Discrete Element Method),investigated the impact of different baffle positions on debris flow *** flow velocity and kinetic energy variations were studied through single-factor *** baffle positions were preliminarily selected by analyzing the influence of the first-row baffle position on the impact force and accumulation mass of debris ***,based on the selected baffle positions and four factors influencing the effectiveness of baffle protection(baffle position(P),baffle height(h),row spacing(S_(r)),and angle of transit area(α)),an orthogonal design was employed to further explore the optimal arrangement of *** research results indicate that the use of a baffle structure could effectively slow down the motion velocity of debris flows and dissipate their *** the baffle is placed in the transit area,the impact force on the first-row baffle is greater than that when the baffle is placed in the deposition ***,when the baffle is placed in the transit area,the obstruction effect on debris flow mass is also greater than that when the baffle is placed in the deposition *** orthogonal experimental range analysis,when the impact on the first row of baffles is used as the evaluation criterion,the importance of each influencing factor is ranked asα>P>S_(r)>*** the mass of debris flow behind the baffle is regarded as the evaluation criterion,the rank is changed to P>α>S_(r)>*** experimental simulation results show that the optimal baffle arrangement is:P_(5),S_(r)=16,α=35°,h=9.

关键词： Debris flow Baffle Protective effect Discrete element