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Analysis of impact pressure,rock-breaking effect,and ground vibration induced by the disposable CO_(2)fracturing tube

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3099-3121页

作者： Chong Yu Yongan Ma Haibo Li Shouchun deng Yafei Hao Kuan Zhu State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Explosives Co.Ltd. Changsha410000China Wuhan University of Science and Technology Wuhan430000China Gezhouba EXPL(Hunan)Technology Co.Ltd. Liuyang410300China

The technology of expansion fracturing with liquid CO_(2)(EFLCO_(2))has attracted increasing attention due to reduced vibration and *** disposable fracturing tube has been developed and is gradually replacing the Cardox ***,there is a lack of impact pressure testing of disposable tubes under real working conditions,selection of gas explosion design parameters,and systematic analysis of blasting *** limitation has constrained the widespread application of disposable fracturing tubes in engineering.A joint monitoring of the pressure-time curves in the disposable tubes and boreholes was *** rock-breaking effect of varying hole spacing parameters in the EFLCO_(2)design was analyzed,and a systematic study was carried out on the vibration peak value,frequency,and energy *** results show that(1)the pressure distribution characteristics,stress peak value,and duration in the disposable tubes are different from those of Cardox tubes,which show multi-peak distribution,low-pressure peak value,and short *** correlation between the pressure in the disposable tube,filling pressure,and liquid CO_(2)weight is established,and a theoretical calculation method for the borehole wall pressure is proposed;(2)The hole spacing in rocks of different hardness is suggested;and(3)At the same scale distance,the peak particle velocity(PPV)caused by EFLCO_(2)(PPVCO_(2))is significantly smaller than that caused by blasting(PPVexplosive).The ratio of PPVexplosive to PPVCO_(2)is a power function related to scale distance,and a distance-related zonality exist in this *** frequency composition of the vibration signal caused by EFLCO_(2)is relatively simple with a narrow frequency *** PPV and energy are mainly concentrated in the low-frequency *** research contributes to the optimization of disposable fracturing tubes,gas explosion design,and vibration hazard control.

关键词： Disposable tube Liquid CO_(2) Impact pressure Hole spacing Vibration effect Cardox tube

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Replication, pathogenicity, and transmission of SARS-CoV-2 in minks

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National Science Review 2021年第3期8卷 21-28页

作者： Lei Shuai Gongxun Zhong Quan Yuan Zhiyuan Wen Chong Wang Xijun he Renqiang Liu Jinliang Wang Qinjian Zhao Yuxiu Liu Ningning Huo junhua deng Jingjing Bai Hongchao Wu Yuntao Guan Jianzhong Shi Kegong Tian Ningshao Xia Hualan Chen Zhigao Bu State Key Laboratory of Veterinary Biotechnology Harbin Veterinary Research Institute Chinese Academy of Agricultural Sciences National High Containment Laboratory for Animal Diseases Control and Prevention State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics National Institute of Diagnostics and Vaccine Development in Infectious DiseasesSchool of Public Health Xiamen University National Research Center for Veterinary Medicine

Minks are raised in many countries and have transmitted severe acute respiratory syndrome coronavirus 2(SARS-CoV-2) to ***,the biologic properties of SARS-CoV-2 in minks are largely ***,we investigated and found that SARS-CoV-2 replicates efficiently in both the upper and lower respiratory tracts,and transmits efficiently in minks via respiratory droplets;pulmonary lesions caused by SARS-CoV-2 in minks are similar to those seen in humans with *** further found that a spike protein-based subunit vaccine largely prevented SARS-CoV-2 replication and lung damage caused by SARS-CoV-2 infection in *** study indicates that minks are a useful animal model for evaluating the efficacy of drugs or vaccines against COVID-19 and that vaccination is a potential strategy to prevent minks from transmitting SARS-CoV-2.

关键词： SARS-CoV-2 mink replication pathogenicity transmission animal model

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Calculation aided miscibility manipulation enables highly efficient polythiophene:nonfullerene photovoltaic cells

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Science China Chemistry 2021年第3期64卷 478-487页

作者： Qi Wang Miaomiao Li Zhongxiang Peng Nigel Kirby Yunfeng deng Long Ye Yanhou Geng Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Molecular Optoelectronic Science Tianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin 300072China Australian Synchrotron ClaytonVictoria 3168Australia State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China

Polythiophenes,with merits of low cost and high scalability of synthesis,have received growing interest in organic solar *** date,the best-performing polythiophene:nonfullerene solar cells exhibit typical power conversion efficiencies (PCEs) of 10%–12%,which is much lower than those employing PM6-and D18-type *** inferior performance is mostly limited by the improper miscibility between polythiophene and *** on engineering the molecular structure to systematically tune the miscibility are *** the aid of group contribution calculations,the miscibility of polythiophene:nonfullerene blend system was finely tuned by varying the ratios of siloxane-terminated chains and alkyl chains in ester-substituted polythiophenes through random *** on a series of the polythiophene and nonfullerene acceptors,the detailed analysis of blend miscibility and performance reveals a surprising anticorrelation between the Flory-Huggins interaction parameter (χ_(aa)) and the optimal time of solvent vapor annealing for device performance across these *** due to the slightly higher χ_(aa),the blend of PDCBT-Cl-Si5 and ITIC-Th1 results in a record-high PCE of 12.85%in polythiophene:nonfullerene solar *** results not only provide a calculation-guided approach for molecular design but also prove that precise control of the miscibility is an effective way to design high-performance polythiophene:nonfullerene blends and beyond.

关键词： nonfullerene organic solar cells polythiophenes miscibility molecular design

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A fully automated centrifugal microfluidic system for sample-to-answer viral nucleic acid testing

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Science China Chemistry 2020年第10期63卷 1498-1506页

作者： Fei Tian Chao Liu Jinqi deng Ziwei Han Lu Zhang Qinghua Chen Jiashu Sun CAS Key Laboratory of Standardization and Measurement of Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry Capital Normal UniversityBeijing 100048China

The outbreak of virus-induced infectious diseases poses a global public-health *** acid amplification testing(NAAT)enables early detection of pandemic viruses and plays a vital role in preventing onward ***,the requirement of skilled operators,expensive instrumentation,and biosafety laboratories has hindered the use of NAAT for screening and diagnosis of suspected *** we report development of a fully automated centrifugal microfluidic system with sample-in-answer-out capability for sensitive,specific,and rapid viral nucleic acid *** release of nucleic acids and the subsequent reverse transcription loop-mediated isothermal amplification(RT-LAMP)were integrated into the reaction units of a microfluidic *** whole processing steps such as injection of reagents,fluid actuation by rotation,heating and temperature control,and detection of fluorescence signals were carried out automatically by a customized *** validate the centrifugal microfluidic system using oropharyngeal swab samples spiked with severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)armored RNA *** estimated limit of detection for armored RNA particles is 2 copies per reaction,the throughput is 21 reactions per disc,and the assay sample-to-answer time is approximately 70 *** enclosed and automated microfluidic system efficiently avoids viral contamination of aerosol,and can be readily adapted for virus detection outside the diagnostic laboratory.

关键词： nucleic acid testing virus microfluidics sample-to-answer automation

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Improvement in Tol2 transposon for efficient large-cargo capacity transgene applications in cultured cells and zebrafish(Danio rerio)

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Zoological Research 2024年第3期45卷 567-574页

作者： Peng-Cheng Wang Hao deng Rang Xu Jiu-Lin Du Rongkun Tao Department of Pediatric Cardiology Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghai 200092China Institute of Neuroscience State Key Laboratory of NeuroscienceCenter for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai 200031China Medical School Kunming University of Science and TechnologyKunmingYunnan 650500China Scientific Research Center Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghai 200092China University of Chinese Academy of Sciences Beijing 100049China School of Life Science and Technology ShanghaiTech UniversityShanghai 200031China

Most viruses and transposons serve as effective carriers for the introduction of foreign DNA up to 11 kb into vertebrate ***,their activity markedly diminishes with payloads exceeding 11 *** the payload capacity of transposons could facilitate more sophisticated cargo designs,improving the regulation of expression and minimizing mutagenic risks associated with molecular therapeutics,metabolic engineering,and transgenic animal *** this study,we improved the Tol2 transposon by increasing protein expression levels using a translational enhancer(QBI SP163,ST)and enhanced the nuclear targeting ability using the nuclear localization protein H2B(SHT).The modified Tol2 and ST transposon efficiently integrated large DNA cargos into human cell cultures(H1299),comparable to the well-established super PiggyBac ***,mRNA from ST and SHT showed a significant increase in transgene delivery efficiency of large DNA payloads(8 kb,14 kb,and 24 kb)into zebrafish(Danio rerio).This study presents a modified Tol2 transposon as an enhanced nonviral vector for the delivery of large DNA payloads in transgenic applications.

关键词： Zebrafish Tol2 transposase Transgene Large payload Synthetic biology

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Anomalous bond lengthening in compressed magnetic doped semiconductor Ba(Zn_(0.95)Mn_(0.05))_(2)As_(2)

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Journal of Semiconductors 2024年第4期45卷 36-41页

作者： Fei Sun Yi Peng Guoqiang Zhao Xiancheng Wang Zheng deng Changqing Jin Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physics University of Chinese Academy of SciencesBeijing 101408China Center for High Pressure Science and Technology Advanced Research Beijing 100094Chin

Applying pressure has been evidenced as an effective method to control the properties of semiconductors,owing to its capability to modify the band configuration around Fermi ***,structural evolutions under external pres-sures are required to analyze the *** high-pressure structure of a magnetic doped semiconductor Ba(Zn_(0.95)Mn_(0.05))_(2)As_(2)is studied with combination of in-situ synchrotron X-ray diffractions and diamond anvil *** materials become ferromagnetic with Curie temperature of 105 K after further 20%K *** title material undergoes an isostruc-tural phase transition at around 19 *** the transition pressure,it is remarkable to find lengthening of Zn/Mn-As bond within Zn/MnAs layers,since chemical bonds are generally shortened with applying *** with the bond stretch,interlayer As-As distances become shorter and the As-As dimers form after the phase *** further compres-sion,Zn/Mn-As bond becomes shortened due to the recovery of isotropic compression on the Zn/MnAs layers.

关键词： magnetic semiconductor high-pressure in-situ X-ray diffraction phase transition

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Evaluating the Network Communication Delay with WAMS for Multi-energy Complementary Systems

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CSEE Journal of Power and Energy Systems 2020年第2期6卷 402-409页

作者： Xiaoli Liu Shuaidong Zhang Xianghui Zeng Lei Yao Yujie Ding Changhong deng School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China GNSS Research Center Wuhan UniversityWuhan 430072China Electric Power Research Institute of State Grid Qinghai Electric Power Corporation Xining 810008China

A key infrastructure component of phasor-based wide-area monitoring and control systems(WAMCS)for multienergy systems is the requirement that the practical network communication should not only be reliable but also sufficiently effective to ensure real time monitoring and fast ***,the rise in the deployment of phasor measurement units(PMUs)has increased the effective attack surface available to attackers and wide area measurement system(WAMS)*** applications have strict and stringent delay request,*** to end delay as well as delay variation between measurements from different *** order to solve this problem,this paper proposed that the communication network hierarchy is an effective method for evaluating latency by considering the dynamic characteristics of the PMU data stream in the *** with the existing methods,where the upper bound of delay was given,the proposed method is approximated to the real latency in order to enhance the performance of the controller by considering the delay *** this paper,a three-layer hierarchical distributed topology structure of the WAMS communication network was therefore *** the dynamic characteristics of time-division grading and sampling intervals with the PMU data stream of the WAMS communication network,the network calculus algorithm was exploited to assess the latency of the dynamic PMU data stream for a 50 Hz power ***,an OPNET-based three-layer communication network simulation model was *** order to demonstrate the effectiveness of the proposed method,the results from a simulation controller are presented.

关键词： Communication latency network calculus OPNET PMU WAMS

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Acoustic emission source location method and experimental verification for structures containing unknown empty areas

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International Journal of Mining Science and Technology 2022年第3期32卷 487-497页

作者： Longjun Dong Qing Tao Qingchun Hu Sijia deng Yongchao Chen Qiaomu Luo Xihong Zhang School of Resources and Safety Engineering Central South UniversityChangsha 410083China School of Civil and Mechanical Engineering Curtin UniversityPerth 6102Australia

Acoustic emission(AE)localization plays an important role in the prediction and control of potential hazardous sources in complex ***,existing location methods have less discussion on the presence of unknown empty *** paper proposes an AE source location method for structures containing unknown empty areas(SUEA).Firstly,this method identifies the shape,size,and location of empty areas in the unknown region by exciting the active AE sources and using the collected AE ***,the unknown AE source can be located considering the identified empty *** lead break experiments were performed to verify the effectiveness and accuracy of the proposed *** specimens were selected containing empty areas with different positions,shapes,and *** show the average location accuracy of the SUEA increased by 78%compared to the results of the existing *** can provide a more accurate solution for locating AE sources in complex structures containing unknown empty areas such as tunnels,bridges,railroads,and caves in practical engineering.

关键词： Acoustic emission Source location Empty area identification

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Research on aiming methods for small sample size shooting tests of two-dimensional trajectory correction fuse

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Defence Technology（防务技术） 2024年第3期33卷 506-517页

作者： Chen Liang Qiang Shen Zilong deng Hongyun Li Wenyang Pu Lingyun Tian Ziyang Lin School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China

The longitudinal dispersion of the projectile in shooting tests of two-dimensional trajectory corrections fused with fixed canards is extremely large that it sometimes exceeds the correction ability of the correction fuse *** impact point easily deviates from the target,and thus the correction result cannot be readily ***,the cost of shooting tests is considerably high to conduct many tests for data *** address this issue,this study proposes an aiming method for shooting tests based on small sample *** proposed method uses the Bootstrap method to expand the test data;repeatedly iterates and corrects the position of the simulated theoretical impact points through an improved compatibility test method;and dynamically adjusts the weight of the prior distribution of simulation results based on Kullback-Leibler divergence,which to some extent avoids the real data being"submerged"by the simulation data and achieves the fusion Bayesian estimation of the dispersion *** experimental results show that when the simulation accuracy is sufficiently high,the proposed method yields a smaller mean-square deviation in estimating the dispersion center and higher shooting accuracy than those of the three comparison methods,which is more conducive to reflecting the effect of the control algorithm and facilitating test personnel to iterate their proposed structures and algorithms.;in addition,this study provides a knowledge base for further comprehensive studies in the future.

关键词： Two-dimensional trajectory correction fuse Small sample size test Compatibility test KL divergence Fusion bayesian estimation

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High-sensitivity self-powered temperature/pressure sensor based on flexible Bi-Te thermoelectric film and porous microconed elastomer

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Journal of Materials Science & Technology 2022年第8期103卷 1-7页

作者： Yaling Wang Wei Zhu Yuan deng Pengcheng Zhu Yuedong Yu Shaoxiong Hu Ruifeng Zhang School of Materials Science and Engineering Beihang UniversityBeijing 100191China Hangzhou Innovation Institute Beihang UniversityHangzhou 310052China Research Institute for Frontier Science Beihang UniversityBeijing 100083China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China College of Science Henan Agricultural UniversityZhengzhou450002China

Electronic skins are artificial skin-type multifunctional sensors,which hold great potentials in intelligent robotics,limb prostheses and human health ***,it is a great challenge to independently and accurately read various physical signals without power ***,a self-powered flexible temperature-pressure bimodal sensor based on high-performance thermoelectric films and porous microconed conductive elastic materials is *** introducing flexible heat-sink design and harvesting body heat energy,the thin-film thermoelectric device could not only precisely sense temperature signal but also drive the pressure sensor for detecting external tactile *** integration of Bi-Te based thermoelectric film with high stability in wide temperature range enables the sensor to sense the ambient temperature with high resolution(he porous microconed elastomer responds to pressure variation with low-pressure detection(16 Pa)and a high sensitivity of 37 kPa^(-1).Furthermore,the bimodal sensor could accurately and simultaneously monitor human wrist pulse and body temperature in real time,which demonstrates promising applications in self-powered electronic skins for human health monitoring systems.

关键词： Bimodal sensor Body heat energy Porous microconed architecture Bi-Te based thermoelectric film Self-powered E-skins

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