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Seismic behaviors of utility tunnel-soil system: With and without joint connections

Underground Space 2022年第5期7卷 798-811页

作者： Liang Han Hanlong Liu Wengang Zhang Xuanming Ding Zhixiong Chen Li Feng Zhenyu Wang School of Civil Engineering Chongqing UniversityChongqing 400044China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400044China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing 400044China Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China

Seismic responses of utility tunnel-soil system were studied via shaking table model tests with considerations of two kinds of double box utility tunnels:with and without joint *** two testing utility tunnel models were made of galvanized iron wire and micro-concrete,and the ground was simulated by the dry standard sand through layered tamping *** utility tunnel-soil system was subjected to horizontal vibration in uniaxial direction perpendicular to the longitudinal direction of tunnel *** instrumentations of earth pressure gauges,accelerometers and strain gauges,the earth pressure response,acceleration response and bending moment response were *** testing results show that the joint connections in the utility tunnel along the longitudinal direction play an important role in determining the characteristic of earth pressure response and bending moment response,whereas the effect of joint connections on acceleration response is less *** addition,the partition wall exhibits the consistent acceleration response with the side-wall of double box utility tunnel model under seismic *** on the testing results,it is suggested that the joint connection should be taken reasonably into consideration during design and construction for engineering practice.

关键词： Utility tunnel Joint connections Seismic behaviors Shaking table Model test

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Insight into the formation of iodinated tr ihalomethanes dur ing chlor ination,monochloramination, and dichloramination of iodide-containing water

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Journal of Environmental sciences 2022年第7期34卷 285-294页

作者： Shuang Zhang Yi-Li Lin Tian-Yang Zhang Chen-Yan Hu Zhi Liu Zheng-Yu Dong Meng-Yuan Xu Bin Xu State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze Water EnvironmentMinistry of EducationCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Department of Safety Health and Environmental Engineering“National”Kaohsiung University of Science and TechnologyKaohsiung 824Chinese Taipei College of Environmental and Chemical Engineering Shanghai University of Electric PowerShanghai 200090China

In this study, the formation of iodinated trihalomethanes(I-THMs) was systematically evaluated and compared for three treatment processes-(i) chlorination,(ii) monochloramine, and(iii) dichloramination-under different p H conditions. The results demonstrated that ITHM formation decreased in the order of monochloramination > dichloramination > chlorination in acidic and neutral p H. However, the generation of I-THMs increased in the dichloramination < chlorination < monochloramination order in alkaline condition. Specifically, the formation of I-THMs increased as p H increased from 5 to 9 during chlorination and monochloramination processes, while the maximum I-THM formation occurred at pH 7 during dichloramination. The discrepancy could be mainly related to the stability of the three chlor(am) ine disinfectants at different p H conditions. Moreover, in order to gain a thorough insight into the mechanisms of I-THM formation during dichloramination, further investigation was conducted on the influencing factors of DOC concentration and Br/Imolar ratio. I-THM formation exhibited an increasing and then decreasing trend as the concentration of DOC increased from 1 to 7 mg-C/L, while the yield of I-THMs increased with increasing Br/Imolar ratio from 5:0 to 5:10. During the three processes mentioned above, similar I-THM formation results were also obtained in real water, which indicates that the excessive generation of I-THMs should be paid special attention during the disinfection of iodide-containing water.

关键词： Inorganic chloramine Iodinated trihalomethanes(I-THMs) Chlorination Monochloramination Dichloramination Bromide to iodide ratio

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Design of coupling structure between THz flexible waveguide and metal rectangular waveguide

Design of coupling structure between THz flexible waveguide ...

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IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Wei Shao Zhongbo Zhu Bochao Kang Sheng Li Shengxiao Jin Caixia Wang Wanzhao Cui Chongdi Duan National Key Laboratory of Science and Technology on Space Microwave CAST Xi’an China School of Integrated Circuits and Electronics Beijing Institute of Technology Beijing China

ISBN: (数字)9798350351019

ISBN: (纸本)9798350351026

In this paper, a coupling structure between a terahertz flexible waveguide and a metal rectangular waveguide is designed and optimized. By loading the special-shaped waveguide, the transmission loss of better than -1.5 dB and reflection coefficient of less than -15 dB are designed and achieved in the frequency range of $216-230 \mathrm{GHz}$. The results indicate that this proposed structure can realize a high conversion efficiency between HE 11 mode of flexible waveguide and TE 10 mode of metal rectangular waveguide, which provides strong support for future terahertz space communication applications.

关键词： Couplings Circular waveguides Space communications Rectangular waveguides Metals Propagation losses Structural engineering Reflection coefficient Optimization Terahertz communications

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Systematic study on the proton radioactivity of spherical proton emitters

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Nuclear science and Techniques 2023年第4期34卷 93-101页

作者： Dong-Meng Zhang Lin-Jing Qi De-Xing Zhu Yang-Yang Xu Song Luo Xiao-Hua Li School of Nuclear Science and Technology University of South ChinaHengyang 421001China National Exemplary Base for International Sci&Tech.Collaboration of Nuclear Energy and Nuclear Safety University of South ChinaHengyang 421001China Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment University of South ChinaHengyang 421001China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control Hunan Normal UniversityChangsha 410081China

In this study, based on a two-potential approach, we systematically investigated the proton radioactivity half-lives of spherical proton emitters with 69≤Z≤81 from the ground and/or isomeric state, choosing the nuclear potential to be a modified Woods–Saxon potential that contains the isospin effect of the daughter nucleus. It was found that the calculated half-lives could reproduce the experimental data well. Furthermore, we extended this model to predict the half-lives of 17 protonemitting candidates whose radioactivity is energetically allowed or observed but not yet quantified in NUBASE2020. For comparison, the unified fission model, Coulomb potential and proximity potential model, universal decay law for proton emission, and new Geiger–Nuttall law were also used. All the predicted results are consistent with each other.

关键词： Proton radioactivity Spherical nuclei Two-potential approach Modified Woods–Saxon potential Half-lives

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Elevated efficiency in tartrazine removal from wastewater through boron-doped biochar:enhanced adsorption and persulfate activation

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Biochar 2024年第1期6卷 1408-1429页

作者： Xiaojuan Chen Yu Zhou Juhua He Suresh CPillai Ning Li Song Xu Jiesen Li Xin Chen Hailong Wang School of Environmental and Chemical Engineering Foshan UniversityFoshan 528225China. School of Food Science and Engineering Foshan UniversityFoshan 528225China. Nanotechnology Research Group Department of Environmental ScienceFaculty of ScienceInstitute of Technology SligoAsh LaneSligo F91 YW50Ireland. Guangdong Provincial Key Laboratory of Integrated Agro-Environmental Pollution Control and Management Institute of Eco-Environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China.

Boron-doped biochar(B-BC)was synthesized by pyrolysis using solid waste of sorghum straw as raw *** specific surface area of B-BC increased significantly by 2.38 times compared to that of pure *** enhancement allowed B-BC(0.3 g L^(−1))to achieve complete adsorption of 10 mg L^(−1)tartrazine(TTZ)within 40 ***,acidic conditions were more favorable for TTZ adsorption,achieving complete removal of TTZ in only 15 min at a pH of ***,the adsorption rate of TTZ by B-BC in the presence of 0.05 M Cl^(-)was approximately 2.12 times higher than that in the absence of Cl^(-).When other background electrolytes were present,excluding PO_(4)^(3−),complete adsorption of TTZ could also be achieved within 60 *** analysis and DFT calculations described the parameters of B-BC for TTZ adsorption,includingG(<0 kJ mol^(−1)),H(−2.199 kJ mol^(−1)),S(−6.068 J mol^(−1)K^(−1)),and the adsorption energy(E_(ads)=−0.6919 eV),indicating a tendency towards a spontaneous adsorption ***,the strong electron transfer ability of B-BC and the oxygen-containing groups promoted the activation of PDS and generation of active substances such as^(1)O_(2),O_(2)^(•−),and SO_(4)^(•−),thereby degrading TTZ into products with lower biological *** the added PDS was only 0.1 mM,the degradation rate constant of TTZ could reach 0.1481 min−***,boron doping enhanced the stability of biochar,enabling the complete removal of 10 mg L^(−1)TTZ even after recycling and *** summary,this study offers a practical solution for the resource utilization of solid waste sorghum straw and the treatment of TTZ-polluted wastewater.

关键词： Sorghum straw Boron doping DFT Degradation Wastewater treatment Peroxydisulfate

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Oscillation of Dzyaloshinskii–Moriya interaction driven by weak electric fields

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Chinese Physics B 2024年第2期33卷 487-491页

作者：陈润泽曹安妮王馨苒柳洋杨洪新赵巍胜 Fert Beijing Institute MIIT Key Laboratory of SpintronicsSchool of Integrated Circuit Science and EngineeringBeihang UniversityBeijing 100191China Hefei Innovation Research Institute Beihang UniversityHefei 230013China Beihang-Goertek Joint Microelectronics Institute Qingdao Research InstituteBeihang UniversityQingdao 266000China National Laboratory of Solid State Microstructures School of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Beijing Microelectronics Technology Institute Beijing 100076China

Dzyaloshinskii–Moriya interaction(DMI) is under extensive investigation considering its crucial status in chiral magnetic orders, such as Néel-type domain wall(DW) and skyrmions. It has been reported that the interfacial DMI originating from Rashba spin–orbit coupling(SOC) can be linearly tuned with strong external electric fields. In this work, we experimentally demonstrate that the strength of DMI exhibits rapid fluctuations, ranging from 10% to 30% of its original value, as a function of applied electric fields in Pt/Co/MgO heterostructures within the small field regime(< 10-2V/nm). Brillouin light scattering(BLS) experiments have been performed to measure DMI, and first-principles calculations show agreement with this observation, which can be explained by the variation in orbital hybridization at the Co/MgO interface in response to the weak electric fields. Our results on voltage control of DMI(VCDMI) suggest that research related to the voltage control of magnetic anisotropy for spin–orbit torque or the motion control of skyrmions might also have to consider the role of the external electric field on DMI as small voltages are generally used for the magnetoresistance detection.

关键词： Dzyaloshinskii-Moriya interaction weak electric field control effect Rashba spin-orbit coupling interfacial orbital hybridization

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Cooling performance study of coplanar counterflow microchannels 22

Cooling performance study of coplanar counterflow microchann...

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22nd InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2023

作者： Yang, Yuchi Lyu, Peijue Li, Motong Yang, Zhou Du, Jianyu Zhang, Chi Wang, Wei School of Integrated Circuits Peking University Beijing100871 China Tsinghua University Department of Engineering Mechanics Beijing100084 China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Beijing100871 China

ISBN: (纸本)9798350321661

Embedded microfluidic cooling improves cooling efficiency by avoiding interfacial thermal resistance. However, the temperature rise of the fluid along the flow direction leads to an uneven axial temperature of the straight parallel microchannels (SPMCs), which then causes the degradation of microfluidic cooling uniformity, especially at the outlet position with the greatest thermal resistance. Counterflow microchannels (CFMCs) heat exchangers can be realized by adjusting the flow direction of adjacent channels to the opposite direction. In this paper, a one-dimensional thermal resistance model of CFMCs heat exchangers is established, and the surface temperature distribution characteristics of heat exchangers are studied. Under the assumption of a constant convective heat transfer coefficient, the equivalent neutral plane and the equivalent adiabatic line are defined, and the temperature distribution of the heating surface is analyzed by using the temperature rise characteristics of the working fluid after heat absorption. Both theoretical and numerical results show a quadratic distribution of the surface temperature in CFMCs. Compared with the SPMCs, CFMCs result in a higher average surface temperature but a lower maximum surface temperature, while the temperature standard deviation is reduced by more than 60%. © 2023 IEEE.

关键词： Surface temperature

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Spurious-Free and Low-Loss Surface Acoustic Wave Filter Beyond 5 GHz

Spurious-Free and Low-Loss Surface Acoustic Wave Filter Beyo...

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2023 IEEE International Ultrasonics Symposium, IUS 2023

作者： Zhang, Liping Zhang, Shibin Wu, Jinbo Zheng, Pengcheng Yao, Hulin Fang, Xiaoli Huang, Kai Zhou, Min Ou, Xin Cinese Academy of Sciences National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information Technology Shanghai China University of Chinese Academy of Sciences The Center of Materials Science and Optoelectronics Engineering Beijing China

ISBN: (纸本)9798350346459

In this work, the high-frequency shear horizontal surface acoustic wave (SH-SAW) devices are demonstrated based on the high-velocity, low-loss and high-temperature stability LiTaO3/SiC hetero-substrate. Through finite element simulations, the ratio of the LiTaO3 thickness to interdigital transducers (IDT) pitch is specially designed to achieve high-frequency response and avoid the appearance of the Rayleigh spurious mode. Besides, the double piston IDT is adopted to suppress transverse modes. The series and shunt SH-SAW resonators operating at high resonant frequencies up to 4.9~5.2 GHz exhibit high quality factors of more than 1700 and suppressed spurious modes. The fabricated SAW filter shows an ultra-high center frequency of 5.1 GHz, a 3-dB bandwidth of 251 MHz, a low minimum insertion loss of 0.98 dB, a spurious-free frequency response and a sufficient out-of-band rejection (>32 dB) in the range of 0.5~6.5 GHz. © 2023 IEEE.

关键词： Substrates

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Tauroursodeoxycholic acid(TUDCA)improves intestinal barrier function associated with TGR5-MLCK pathway and the alteration of serum metabolites and gut bacteria in weaned piglets

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Journal of Animal science and Biotechnology 2022年第6期13卷 1917-1931页

作者： Min Song Fenglin Zhang Yiming Fu Xin Yi Shengchun Feng Zhichang Liu Dun Deng Qiang Yang Miao Yu Canjun Zhu Xiaotong Zhu Lina Wang Ping Gao Gang Shu Xianyong Ma Qingyan Jiang Songbo Wang Guangdong Provincial Key Laboratory of Animal Nutrition Control ALLT ECH-SCAU Animal Nutrition Control Research Allianceand National Engineering Research Center for Breeding Swine IndustryCollege of Animal ScienceSouth China Agricultural UniversityGuangzhou 510642P.R.China Institute of Animal Science Guangdong Academy of Agricultural SciencesState Key Laboratory of Livestock and Poultry BreedingKey Laboratory of Animal Nutrition and Feed Science in South ChinaMinistry of Agriculture and Rural AffairsGuangdong Key Laboratory of Animal Breeding and NutritionGuangdong Engineering Technology Research Center of Animal Meat Quality and Safety Control and EvaluationGuangzhou 510640P.R.China Maoming Branch Guangdong Laboratory for Lingnan Modern Agricultural Science and TechnologyMaoming 525000P.R.China

Background:Tauroursodeoxycholic acid(TUDCA),a hydrophilic bile acid,is the main medicinal component of bear bile and is commonly used to treat a variety of hepatobiliary ***,TUDCA has been shown to modulate the intestinal barrier function and alleviate DSS-induced colitis in ***,the effect of TUDCA on the intestinal barrier of weaned piglets remains largely ***:The weaned piglets and porcine IPEC-J2 intestinal epithelial cells were used to investigate the effects of TUDCA on intestinal barrier function in weaned piglets and explore the possible underlying *** vivo,72 healthy weaned piglets were randomly allocated into 2 groups according to their gender and body weight,and piglets were fed the basal diet with 0(control,CON)and 200 mg/kg TUDCA for 30 d,*** female and three male piglets reflecting the average bodyweight were slaughtered in each group and samples were *** vitro,IPEC-J2 cells were subjected to 100μmol/L TUDCA to explore the possible underlying ***:Our results demonstrated that dietary TUDCA supplementation significantly reduced the diarrhea incidence of weaned piglets,possibly attributing to the TUDCA-enhanced intestinal barrier function and *** addition,TUDCA supplementation altered serum metabolites and the relative abundance of certain gut bacteria,which might contribute to the improved intestinal barrier ***,the in-vitro results showed that TUDCA improved the ***-induced epithelial barrier impairment of IPEC-J2 cells and increased Takeda G-coupled protein receptor 5(TGR5)protein ***,knockdown of TGR5 and inhibition of myosin light chain kinase(MLCK)pathway abolished the TUDCA-improved epithelial barrier impairment in ***-treated IPEC-J2 cells,indicating the involvement of TGR5-MLCK in this ***:These findings showed that TUDCA improved intestinal barrier function associated with TGR5-MLCK pathway and the al

关键词： Gut bacteria Intestinal barrier function Serum metabolites Tauroursodeoxycholic acid(TUDCA) TGR5-MLCK pathway Weaned piglets

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Advances in nuclear detection and readout techniques

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Nuclear science and Techniques 2023年第12期34卷 281-358页

作者： Rui He Xiao‑Yang Niu Yi Wang Hong‑Wei Liang Hong‑Bang Liu Ye Tian Hong‑Lin Zhang Chao‑Jie Zou Zhi‑Yi Liu Yun‑Long Zhang Hai‑Bo Yang Ju Huang Hong‑Kai Wang Wei‑Jia Han Bei Cao Gang Chen Cong Dai Li‑Min Duan Rui‑Rui Fan Fang‑Fa Fu Jian‑Hua Guo Dong Han Wei Jiang Xian‑Qin Li Xin Li Zhuo‑Dai Li Yu‑Tie Liang Shun Liao De‑Xu Lin Cheng‑Ming Liu Guo‑Rui Liu Jun‑Tao Liu Ze Long Meng‑Chen Niu Hao Qiu Hu Ran Xiang‑Ming Sun Bo‑Tan Wang Jia Wang Jin‑Xiang Wang Qi‑Lin Wang Yong‑Sheng Wang Xiao‑Chuan Xia Hao‑Qing Xie He‑Run Yang Hong Yin Hong Yuan Chun‑Hui Zhang Rui‑Guang Zhao Ran Zheng Cheng‑Xin Zhao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516000China Key Laboratory of Particle and Radiation Imaging Department of Engineering PhysicsTsinghua UniversityBeijing 100084China School of Integrated Circuits Dalian University of TechnologyDalian 116020China Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Radiation Oncology National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Electronic Engineering School Heilongjiang UniversityHarbin 150080China Spallation Neutron Source Science Center Dongguan 523803China Micro‑electronic Department Harbin Institute of TechnologyHarbin 150001China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210034China Liaoning Academy of Materials Shenyang 110167China Istituto Nazionale di Fisica Nucleare Sezione di PerugiaPerugiaItaly School of Mathematics and Physics Chengdu University of TechnologyChengdu 620035China PLAC Key Laboratory of Quark and Lepton Physics(MOE)Central China Normal UniversityWuhan 430079China School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710129China State Key Lab of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China School of Computer Science Northwestern Polytechnical UniversityXi’an 710129China

“A Craftsman Must Sharpen His Tools to Do His Job,”said *** detection and readout techniques are the foundation of particle physics,nuclear physics,and particle astrophysics to reveal the nature of the ***,they are being increasingly used in other disciplines like nuclear power generation,life sciences,environmental sciences,medical sciences,*** article reviews the short history,recent development,and trend of nuclear detection and readout techniques,covering Semiconductor Detector,Gaseous Detector,Scintillation Detector,Cherenkov Detector,Transition Radiation Detector,and Readout *** explaining the principle and using examples,we hope to help the interested reader underst and this research field and bring exciting information to the community.

关键词： Silicon detector Wide bandgap detector Time projection chamber(TPC) Multigap resistive plate chamber detector(MRPC) Scintillation detector Calorimeters Cherenkov detector Transition radiation detector Artificial intelligence Trigger-less readout

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