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Therapy of acute severe pancreatitis awaits further improvement

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World Journal of Gastroenterology 1998年第4期4卷 13-14页

作者： wu xianZhong Tianjin Inst. of Acute Abdom. Dis. Tianjin 300100 China Faculty of Medicine Shenyang Medical College China Department of Surgery China Chinese Assoc. Intgd. Chinese W. M. China Tianjin Inst. of Acute Abdom. Dis. Tianjin 300100 Nankai District China

ＴｈｅｒａｐｙｏｆａｃｕｔｅｓｅｖｅｒｅｐａｎｃｒｅａｔｉｔｉｓａｗａｉｔｓｆｕｒｔｈｅｒｉｍｐｒｏｖｅｍｅｎｔＷＵＸｉａｎＺｈｏｎｇＳｕｂｊｅｃｔｈｅａｄｉｎｇｓｐａｎｃｒｅａｔｉｔｉｓ／ｔｈｅｒａｐｙ；ｐａｎｃ... 详细信息

ＴｈｅｒａｐｙｏｆａｃｕｔｅｓｅｖｅｒｅｐａｎｃｒｅａｔｉｔｉｓａｗａｉｔｓｆｕｒｔｈｅｒｉｍｐｒｏｖｅｍｅｎｔＷＵＸｉａｎＺｈｏｎｇＳｕｂｊｅｃｔｈｅａｄｉｎｇｓｐａｎｃｒｅａｔｉｔｉｓ／ｔｈｅｒａｐｙ；ｐａｎｃｒｅａｔｉｔｉｓ／ｄｒｕｇｔｈｅｒ...

关键词： pancreatitis/therapy pancreatitis/drug therapy pancreatitis/mortality pancreatitis/complication TCMWM therapy

Event-based optimization with random packet dropping

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Science China(Information Sciences) 2020年第11期63卷 175-194页

作者： Qing-Shan JIA Jing-xian tang Zhenning LANG Center for Intelligent and Networked Systems Department of AutomationTsinghua University NetEase Inc.

Event-based optimization(EBO) provides a general framework for policy optimization in many discrete event dynamic systems where decision making is triggered by events that represent state transitions with common features. Because the number of events can be defined by the user and usually increases linearly with respect to the system scale, EBO has good potential to address large-scale problems where the state space grows exponentially. However, in many practical systems, sensors are geographically distributed and connected to a central controller through imperfect communication channels. Therefore, events observed by the sensors may not reach the controller. Optimization methods of event-based policies in these cases have not yet been identified. In this paper, we consider this important problem and make three major contributions. First, we formulate a mathematical EBO model in which the communication between sensors and controllers is subject to random packet dropping. Second, we show that this EBO model can be converted to another EBO model with perfect communication. Then, the performance difference equation and the performance derivative equation for event-based policies are straightforward to develop. One gradient-based policy iteration algorithm is developed for problems where the state transition probabilities are explicitly known, while another for problems where they are unknown. Third, the performance of the algorithms and the impact of the packet dropping probability on policy performance are numerically demonstrated on a single-zone occupant level estimation problem in buildings.

关键词： event-based optimization packet dropping discrete event dynamic systems

Early Debonding Detection of Rebar-Concrete Interface due to External Loading Utilizing AC Impedance Spectroscopy

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Journal of wuhan University of Technology(Materials Science) 2023年第2期38卷 381-386页

作者： wu Lipeng YANG Haitao DONG xian School of Civil Engineering Shijiazhuang Tiedao UniversityShijiazhuang050043China State Key Laboratory of Building Safety and Built Environment Beijing100013China

A novel method for detecting early damage at the steel-concrete interface due to external loading based on AC impedance spectroscopy technology was ***,alkali pretreatment was introduced to ensure the accuracy and repeatability of the AC impedance ***,the AC impedance spectroscopy between the steel bar and concrete surface of different bonding positions was tested,and then the physical quantities reflecting the bonding damage condition were obtained by equivalent circuit *** debonding position calculation and AC conductive structure analysis indicate that the change of interface resistance and interface capacitance can seize the development of bonding damage during the loading *** the interface damage develops,obvious changes in interface resistance and interface capacitance are observed,and they cannot be recovered after unloading.

关键词： concrete bond AC impedance spectroscopy equivalent circuit model damage

Homoclinic Solutions for a Class of Second Order Discrete Hamiltonian Systems

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Acta Mathematica Sinica,English Series 2012年第3期28卷 609-622页

作者： xian Hua tang Xiao Yan LIN School of Mathematical Sciences and Computing Technology Central South University Department of Mathematics Huaihua College

Consider the second order discrete Hamiltonian systems

关键词： Homoclinic solution discrete Hamiltonian system critical point

The Structure and Elastic and Thermodynamic Properties of Cubic-NbH_(2) under High Pressures from First-Principles Calculations

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Chinese Physics Letters 2013年第6期30卷 161-164页

作者： LIU xian-Kun tang Bin Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsCAEPMianyang 621900

NbH_(2) hydride is an important material in hydrogen storage ***,until now there have been no experimental and theoretical data on the elastic and thermodynamic *** structure and thermodynamic properties of cubic-NbH_(2) under high temperatures and pressure are investigated by first-principles study based on the pseudo-potential plane-wave density functional theory method using the generalized gradient approximation and quasi-harmonic Debye *** results show that the calculated structural parameters of NbH2 are in good agreement with the available experimental results and other theoretical *** obtained elastic constants satisfy the requirement for mechanical stability,indicating that the NbH_(2) crystal is stable in the investigated pressure and temperature *** the quasi-harmonic Debye model,in which the phononic effects are considered,the thermodynamic properties of NbH_(2),such as the thermal expansion coefficient and the heat capacity dependence of temperature and pressure in the ranges 0–1100K and 0–70GPa,are also obtained,respectively.

关键词： thermodynamic Debye Elastic

Corrosion behavior and failure mechanism of SiC whisker and c-AlPO_(4) particle-modified novel tri-layer Yb_(2)Si_(2)O_(7)/mullite/SiC coating in burner rig tests

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Journal of Advanced Ceramics 2022年第12期11卷 1901-1917页

作者： Pengju CHEN Peng XIAO xian tang Yang LI School of Nuclear Science and Technology University of South ChinaHengyang 421001China Powder Metallurgy Research Institute Central South UniversityChangsha 410083China National Key Laboratory of Science and Technology on High-strength Structural Materials Central South UniversityChangsha 410083China

The corrosion behavior of environmental barrier coatings(EBCs)directly affects the service life and stability of ceramic matrix composite(CMC)structural parts in the *** silicon carbide(SiC)whisker toughening phase and c-AlPO_(4) bonding phase are firstly used to improve the service life of novel tri-layer Yb_(2)Si_(2)O_(7)/mullite/SiC EBCs in the burner rig *** formation of penetrating cracks in Yb_(2)Si_(2)O_(7)/mullite/SiC coating caused the failure of coating at 1673 *** SiC whiskers in mullite middle coating significantly inhibited the formation of penetrating cracks in Yb_(2)Si_(2)O_(7)/mullite/SiC coating,and efficiently prevented the oxidation of carbon fiber reinforced silicon carbide(C_(f)/SiC)samples for 360-min thermal cycles(24 times)with a weight loss of 6.19×10^(−3) g·cm^(−2).Although c-AlPO_(4) particles further improved the service life of SiC_(w)-mullite(SM)coating,the overflow of PO_(x) gas aggravated the formation and expansion of cracks in the Yb_(2)Si_(2)O_(7) outer coating,and caused the service life of overall Yb_(2)Si_(2)O_(7)/c-AlPO_(4)-SiC_(w)-mullite(ASM)/SiC coating to be slightly lower than that of Yb_(2)Si_(2)O_(7)/SM/SiC *** study guides the design of modified tri-layer EBCs with long service life in high-temperature and high-speed gas environment.

关键词： Yb_(2)Si_(2)O_(7) mullite tri-layer sol-gel burner rig test

A Survey of Image Synthesis and Editing with Generative Adversarial Networks

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Tsinghua Science and Technology 2017年第6期22卷 660-674页

作者： xian wu Kun Xu Peter Hall TNList and the Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China the Department of Computer Science University of BathBathUK

This paper presents a survey of image synthesis and editing with Generative Adversarial Networks（GANs）. GANs consist of two deep networks, a generator and a discriminator, which are trained in a competitive way. Due to the power of deep networks and the competitive training manner, GANs are capable of producing reasonable and realistic images, and have shown great capability in many image synthesis and editing *** paper surveys recent GAN papers regarding topics including, but not limited to, texture synthesis, image inpainting, image-to-image translation, and image editing.

关键词： image synthesis image editing constrained image synthesis generative adversarial networks imageto-image translation

A Facile Solid-phase Synthesis of 3-Carboxycoumarins

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Chinese Chemical Letters 2003年第7期14卷 661-662页

作者： Jing tang, Lu Ling wu, xian HUANG Department of Chemisitry, ZhejiangUniversity , Xixi Campus, Hangzhou 310028 Department of Chemisitry ZhejiangUniversity

Carboxycoumsrins were synthesized via the solid phase synthesis conviently. The resin bound cyclic malonic ester reacted with o-methoxy or o-hydroxybenzaldehydes. Then cyclization was processed under H2SO4 to afford... 详细信息

关键词： Resin bound cyclic malonic ester solid phase synthesis 3-carboxycoumarin.

Laboratory analyses of nutrient release processes from Haihe River sediment

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International Journal of Sediment Research 2012年第1期27卷 61-72页

作者： Min wu Xue-ming SUN Sui-liang HUANG xian-qiang tang Miklas SCHOLZ Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education Nankai University Numerical Simulation Group for Water Environment Tianjin Key Laboratory of Environmental Remediation and Pollution ControlCollege of Environmental Science and EngineeringNankai University Civil Engineering Research Centre School of ComputingScience and EngineeringThe University of Salford

Sediment samples were collected from the heavily contaminated Haihe River to conduct static nutrient release experiments with tap water,and to evaluate the effect of dredging depths,salinity and light on the corresponding release *** study is significant because it helps decision-makers to assess the likely impact of dredging(***) on contaminated freshwater and brackish *** concentrations of total nitrogen and inorganic phosphorus were approximately 950 mg/kg and 760 mg/kg,*** typical organic matter concentration was 8.6%.Data obtained from the nutrient leaching experiments indicated that 5cm-dredging of sediment reduced the water column total phosphorus,total dissolved phosphorus and ammonia-nitrogen concentrations *** contrast,dredging 10cm surface sediment could improve the water *** salinity values benefited the release of nitrogen and phosphorus from *** contrast to indoor experiments, concentrations of total phosphorus,total dissolved phosphorus and ammonia-nitrogen were higher for the outdoor experiments.

关键词： Aquatic sediment and water interaction Water quality management Nitrogen Phosphorus Salinity Dredging Water depth Light Haihe River China