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Evaluation of the dynamic sealing performance of cap rocks of underground gas storage under multi-cycle alternating loads

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Energy Geoscience

Energy Geoscience 2024年第4期5卷 125-132页

作者： Lidong mi Yandong Guo Yanfeng Li Daqian Zeng Chunhua Lu Guangquan Zhang Research Institute of Petroleum Exploration and Production SINOPECBeijing100083China Shanxi Institute of Energy TaiyuanShanxi030600China

The static sealing of underground gas storage(UGS),including the integrity of cap rocks and the stability of faults,is analyzed from a macro perspective using a comprehensive geological evaluation *** in pore structure,permeability,and mechanical strength of cap rocks under cyclic loads may impact the rock sealing integrity during the injection and recovery phases of *** this work,the mechanical deformation and failure tests of rocks,as well as rock damage tests under alternating loads,are conducted to analyze the changes in the strength and permeability of rocks under multiple-cycle intense injection and recovery of ***,this study proposes an evaluation method for the dynamic sealing performance of UGS cap rocks under multi-cycle alternating *** findings suggest that the failure strength(70%)can be used as the critical value for rock failure,thus providing theoretical support for determining the upper limit of operating pressure and the number of injection-recovery cycles for the safe operation of a UGS system.

关键词： Alternating load Cap rock Dynamic sealing performance Underground gas storage

Detecting XSS with Random Forest and Multi-Channel Feature Extraction

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Computers, Materials & Continua 2024年第7期80卷 843-874页

作者： Qiurong Qin Yueqin Li Yajie mi Jinhui Shen Kexin Wu Zhenzhao Wang Smart City College Beijing Union UniversityBeijing100101China

In the era of the Internet,widely used web applications have become the target of hacker attacks because they contain a large amount of personal *** these vulnerabilities,stealing private data through crosssite scripting(XSS)attacks is one of the most commonly used attacks by ***,deep learning-based XSS attack detection methods have good application prospects;however,they suffer from problems such as being prone to overfitting,a high false alarm rate,and low *** address these issues,we propose a multi-stage feature extraction and fusion model for XSS detection based on Random Forest feature *** model utilizes RandomForests to capture the intrinsic structure and patterns of the data by extracting leaf node indices as features,which are subsequentlymergedwith the original data features to forma feature setwith richer information *** feature extraction is conducted through three parallel *** I utilizes parallel onedimensional convolutional layers(1Dconvolutional layers)with different convolutional kernel sizes to extract local features at different scales and performmulti-scale feature fusion;Channel II employsmaximum one-dimensional pooling layers(max 1D pooling layers)of various sizes to extract key features from the data;and Channel III extracts global information bi-directionally using a Bi-Directional Long-Short TermMemory Network(Bi-LSTM)and incorporates a multi-head attention mechanism to enhance global ***,effective classification and prediction of XSS are performed by fusing the features of the three *** test the effectiveness of the model,we conduct experiments on six *** achieve an accuracy of 100%on the UNSW-NB15 dataset and 99.99%on the CICIDS2017 dataset,which is higher than that of the existing models.

关键词： Random forest feature enhancement three-channel parallelism XSS detection

Catalytic Peculiarity of Electrode/Polyelectrolyte Interfaces Toward CO_(2) Reduction

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Wuhan University Journal of Natural Sciences 2024年第4期29卷 293-294页

作者： mi Zhensheng WANG Gongwei ZHUANG Lin College of Chemistry and Molecular Sciences Hubei Key Lab of Electrochemical Power SourcesWuhan UniversityWuhan 430072HubeiChina

A prominent feature of modern electrochemical technologies,such as fuel cells,water electrolysis,and CO_(2) electrolysis,is to employ polyelectrolytes instead of liquid *** shift not only mitigates risks like corrosion and leaks associated with liquid electrolytes,but also facilitates the construction of zero-gap membrane electrode assembly(MEA)devices.

关键词： corrosion Catalytic electrode

On a Partially Non-Stationary Vector AR Model with Vector GARCH Noises:Estimation and Testing

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Communications in Mathematical Research 2024年第1期40卷 64-101页

作者： Chor-yiu Sin Zichuan mi Shiqing Ling Department of Economics National Tsing Hua UniversityHsinchu 30013TaiwanP.R.China School of Statistics Shanxi University of Finance and EconomicsTaiyuan 030006P.R.China Department of Mathematics The Hong Kong University of Science and TechnologyKowloonHong KongSARP.R.China

This paper studies a partially nonstationary vector autoregressive(VAR)model with vector GARCH *** study the full rank and the reduced rank quasi-maximum likelihood estimators(QMLE)of parameters in the *** is shown that both QMLE of long-run parameters asymptotically converge to a functional of two correlated vector Brownian *** these,the likelihood ratio(LR)test statistic for cointegration rank is shown to be a functional of the standard Brownian motion and normal vector,*** far as we know,our test is new in the *** critical values of the LR test are simulated via the Monte Carlo *** performance of this test in finite samples is examined through Monte Carlo *** apply our approach to an empirical example of three interest rates.

关键词： Vector AR model cointegration full rank estimation vector GARCH process partially nonstationary reduced rank estimation

Noncovalent cross-linked engineering hydrogel with low hysteresis and high sensitivity for flexible self-powered electronics

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Journal of Energy Chemistry 2024年第7期94卷 136-147页

作者： Hang Yuan Shaowei Han Jia Wei Songwei Li Peipei Yang Hao-Yang mi Chuntai Liu Changyu Shen National Engineering Research Center for Advanced Polymer Processing Technology Key Laboratory of Materials Processing and Mold(Ministry of Education)Zhengzhou UniversityZhengzhou450002HenanChina Yunnan TobaccoQuality Inspection&Supervision Station Kunming 650106YunnanChina

In this study,the hydrogel network was reinforced by covalent-like hydrogen bonding,and the strong binding ability of boron-nitrogen coordination served as the main driving *** them,acrylamide(AM)and 3-acrylamidophenylboronic acid(AAPBA)were the main body,and the numerous hydroxyl groups in the trehalose(Treh)molecule and other polymer groups formed strong hydrogen bonding interactions to improve the mechanical properties of the PAM/PAAPBA/Treh(PAAT)hydrogel and ensured the simplicity of the synthesis *** hydrogel possessed high strain at break(1239%),stress(64.7 kPa),low hysteresis(100%to 500%strain,corresponding to dissipation energy from 1.37 to 7.80 kJ/m^(3)),and outstanding cycling stability(retained more than 90%of maximum stress after 200 ten-sile cycles).By integrating carbon nanotubes(CNTs)into PAAT hydrogel(PAATC),the PAATC hydrogel with excellent strain response performance was successfully *** PAATC conductive hydro-gel exhibited high sensitivity(gauge factor(GF)=10.58 and sensitivity(S)=0.304 kPa^(-1)),wide strain response range(0.5%-1000%),fast response time(450 ms),and short recovery time(350 ms),excellent fatigue resistance,and strain response ***,the PAATC-based triboelectric nanogener-ator(TENG)displayed outstanding energy harvesting performance,which shows its potential for appli-cation in self-powered electronic devices.

关键词： Low hysteresis Covalent-like hydrogen bonding Boron-nitrogen coordination Hydrogel sensor Triboelectric nanogenerator

Precipitation evolution and properties of Cu-15Ni-8Sn alloys via Al microalloying during ageing

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Rare Metals 2024年第10期43卷 5216-5228页

作者： Wei Luo Li-Jun Peng Xu-Jun mi Hao-Feng Xie Yi-Cheng Cao Shu-Hui Huang State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd. GRIMAT Engineering Institute Co. Ltd. General Research Institute for Nonferrous Metals School of Materials Science and Engineering South China University of Technology

Studies have shown that microalloying Cu-Ni-Sn alloys using Al inhibits discontinuous precipitation reactions;however,the mechanism has not been investigated ***,this study explored the properties and precipitation evolution of Cu-15Ni-8Sn alloys without and with 1 wt%Al（Cu-15Ni-8Sn-1Al） during ageing at 500℃ through X-ray diffraction （XRD）,scanning electron microscopy and high-angle annular dark-field scanning transmission electron *** results revealed that in Cu-15Ni-8Sn alloy,DO22ordering first occurred after spinodal decomposition,subsequently transitioning to an L12ordering phase,during which the discontinuous precipitates gradually nucleated at the grain boundaries and formed *** alloy hardness increased sharply with ordering and then decreased rapidly after reaching its peak value,due to the dominance of the discontinuous precipitation ***,the DO22ordered phase did not appear during the ageing of Cu-15Ni-8Sn-1Al alloy,and a Ni3(Alx,Sn1-x) intermetallic compound with L12structure was formed,consuming Ni and Sn atoms,thereby significantly suppressing the discontinuous precipitation reaction and improving the stability during prolonged *** tensile strength （yield strength） of Cu-15Ni-8Sn and Cu-15Ni-8Sn-1Al alloys at peak hardness were 855 （755） and 936 MPa （892 MPa）,respectively,and their main strengthening mechanisms were solid solution strengthening and precipitation *** addition of 1 wt% Al effectively improved the precipitation strengthening effect of Cu-Ni-Sn alloys but severely decreased the ductility.

关键词： Al addition Cu-15Ni-8Sn Precipitation sequence Strengthening mechanism

SUB1 promotes colorectal cancer metastasis by activating NF-κB signaling via UBR5-mediated ubiquitination of UBXN1

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Science China(Life Sciences) 2024年第6期67卷 1199-1211页

作者： Hao Wang Wenwen Chen Yanting Wang Yuzhen Gao Zizhen Zhang Shuyi mi Liangjing Wang Meng Xue Department of Gastroenterology The Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310009China Institution of Gastroenterology Zhejiang UniversityHangzhou 310058China Department of Clinical Laboratory Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China Department of Gastrointestinal Oncology Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing)Peking University Cancer Hospital and InstituteBeijing 100142China

Metastasis accounts for the major cause of colorectal cancer(CRC)related mortality due to the lack of effective *** this study,we integrated the single-cell RNA-seq(sc RNA-seq)and bulk RNA-seq data and identified the transcriptional coactivator SUB1 homolog(SacSaccharomyces cerevisiae)/PC4(positive cofactor 4)associated with CRC *** SUB1 expression was correlated with advanced tumor stage and poor survival in *** vivo and vitro assays showed that SUB1 depletion could inhibit the invasive and metastatic abilities of CRC ***1 activated NF-κB signaling and its transcriptional target genes CXCL1 and CXCL3 to drive CRC ***,SUB1 integrated with the E3 ubiquitin-protein ligase UBR5 and increased its protein level in CRC ***,the increased UBR5mainly mediated Lys11-linked polyubiquitination and degradation of NF-κB negative regulator UBXN1,thus to activate the NF-κB ***,our study demonstrated that SUB1 promoted CRC progression by modulating UBR5/UBXN1 and activating NF-κB signaling,providing a new therapeutic strategy for treating metastatic CRC through targeting SUB1.

关键词： colorectal cancer Metastasis SUB1 UBR5 NF-κB signaling

JA-mediated MYC2/LOX/AOS feedback loop regulates osmotic stress response in tea plant

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Horticultural Plant Journal 2024年第3期10卷 931-946页

作者： Junyan Zhu Hongrong Chen Lu Liu Xiaobo Xia Xiaomei Yan Xiaozeng mi Shengrui Liu Chaoling Wei State Key Laboratory of Tea Plant Biology and Utilization/Key Laboratory of Tea Biology and Tea Processing of ministry of Agriculture/Anhui Provincial Laboratory of Tea Plant Biology and Utilization Anhui Agricultural UniversityHefeiAnhui 230036China

Osmotic stress caused by low-temperature,drought and salinity was a prevalent abiotic stress in plant that severely inhibited plant development and agricultural yield,particularly in tea *** acid(JA)is an important phytohormone involving in plant ***,underlying molecular mechanisms of JA modulated osmotic stress response remains *** this study,high concentration of mannitol induced JA accumulation and increase of peroxidase activity in tea *** transcriptome mined a JA signaling master,MYC2 transcription factor is shown as a hub regulator that induced by mannitol,expression of which positively correlated with JA biosynthetic genes(LOX and AOS)and peroxidase genes(PER).CsMYC2 was determined as a nuclei-localized transcription activator,furthermore,ProteinDNA interaction analysis indicated that CsMYC2 was positive regulator that activated the transcription of CsLOX7,CsAOS2,CsPER1 and CsPER3via bound with their promoters,*** of CsMYC2 expression resulted in a reduced JA content and peroxidase activity and osmotic stress tolerance of tea *** of CsMYC2 in Arabidopsis improved JA content,peroxidase activity and plants tolerance against mannitol ***,we proposed a positive feedback loop mediated by CsMYC2,CsLOX7 and CsAOS2 which constituted to increase the tolerance of osmotic stress through fine-tuning the accumulation of JA levels and increase of POD activity in tea plant.

关键词： Camellia sinensis Jasmonic acid(JA) MYC2 transcription factor Lipoxygenase(LOX) Osmotic stress Peroxidase(POD) Reactive oxygen species(ROS)

The carbon border adjustment mechanism is inefficient in addressing carbon leakage and results in unfair welfare losses

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Fundamental Research 2024年第3期4卷 660-670页

作者： Xinlu Sun Zhifu mi Lu Cheng D'Maris Coffman Yu Liu The Bartlett School of Sustainable Construction University College LondonLondon WC1E 7HBUnited Kingdom College of Urban and Environmental Sciences Peking UniversityBeijing 100871China

The European Commission has proposed a Carbon Border Adjustment Mechanism(CBAM)to reduce carbon leakage and create a level playing field for its domestic products and imported ***,the effectiveness of the proposal remains unclear,especially when it triggers threats of retaliation from trading partners of the European *** apply a Computable General Equilibrium model-Global Trade Analysis Project-to assess the economic and environmental impacts of different CBAM *** we show that the effectiveness of the CBAM to address carbon leakage risks is rather limited,and the CBAM raises concerns over global welfare costs,Correct to Gross Domestic Product(GDP)losses,and violation of equality *** retaliation leads to multiplied welfare losses,which would mostly be borne by poor *** results question the carbon leakage reduction effect of a unilateral trade policy and suggest that climate change mitigation still needs to be performed within the framework of international cooperation.

关键词： Carbon border adjustment mechanism Carbon leakage Climate change mitigation Floorcarbon price Trade retaliation