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Negative short-term impact of intraoperative biliary lavage in patients with hepatolithiasis

World Journal of Gastroenterology 2016年第11期22卷 3234-3241页

作者： ou jiang Rong-Xing Zhou Ke yang Chun-Xian Cai Yu Liu Nan-Sheng Cheng Department of Surgical Oncology The Second People’s Hospital of Neijiang Department of Biliary Surgery West China Medical Center of Sichuan University

AIM: To evaluate short-term outcomes following intraoperative biliary lavage for ***: A total of 932 patients who were admitted to the West China Medical Center of Sichuan University between January 2010 and January 2014 and underwent bile duct exploration and lithotomy were retrospectively included in our study. The patients were divided into the lavage group and the control group. Related pre-, intra-, and postoperative factors were recorded, analyzed, and compared between the two groups in order to verify the effects of biliary lavage on the short-term outcome of patients with hepatolithiasis. RESULTS: Amongst the patients who were included, 678 patients with hepatolithiasis were included in the lavage group, and the other 254 patients were enrolled in the control group. Data analyses revealed that preoperative baseline and related intraoperative variables were not significantly different. However, patients who underwent intraoperative biliary lavage had prolonged postoperative hospital stays(6.67 d vs 7.82 d, P = 0.024), higher hospitalization fees(RMB 28437.1 vs RMB 32264.2, P = 0.043), higher positive rates of bacterial cultures from blood(13.3% vs 25.8%, P = 0.001) and bile(23.6% vs 40.7%, P= 0.001) samples, and increased usage of advanced antibiotics(26.3% vs 38.2%, P = 0.001). In addition, in the lavage group, more patients had fever(> 37.5℃, 81.4% vs 91.1%, P = 0.001) and hyperthermia(> 38.5℃,39.7% vs 54.9%, P = 0.001), and higher white blood cell counts within 7 d after the operation compared to the control ***: Intraoperative biliary lavage might increase the risk of postoperative infection, while not significantly increasing gallstone removal rate.

关键词： Hepatolithiasis Biliary lavage Postoperative infection

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Simulation for MSS-2 low-perigee elliptical orbit satellites:an example of lithospheric magnetic field modelling

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Earth and Planetary Physics 2023年第1期7卷 151-160页

作者： Yi jiang Nils Olsen JiaMing ou Qing Yan State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyTaipa 999078MacaoChina Division of Geomagnetism DTU SpaceNational Space InstituteTechnical University of DenmarkDiplomvej 3712800 Kgs.LyngbyDenmark

A future constellation of at least four geomagnetic satellites(designated Macao Scientific Satellite-1(MSS-1)and Macao Scientific Satellite-2(MSS-2))was recently proposed,to continue high-quality geomagnetic observations in the post-Swarm period,focusing especially on collecting data that will provide a global,three-dimensional survey of the geomagnetic *** this paper,we present a simulation of two years of orbits(2020.01.01-2022.01.01)of two satellites(tentatively denoted as MSS-2)that are constellated in elliptical(200×5,300 km)low-perigee *** comparing error variances of Gauss coefficients,we investigate the sensitivity of lithospheric magnetic field modelling to data collected from various satellite orbits,including a near circular reference orbit of 300×350km,and elliptical orbit of 180×5,300 km,220×5,300 km,200×3,000 km and 200×1,500 *** find that in two years the two MSS-2 satellites can collect 35,000 observations at altitude below 250 km,data that will be useful in advancing the quality of lithospheric magnetic field modelling;this number of observations reflects the fact that only 4.5%of the flight time of these satellites will be below250 km(just 6.4%of their flight time below 300 km).By combining observations from the MSS-2 satellites’elliptical orbits of 200×5,300km with observations from a circular reference orbit,the variance of the geomagnetic model can be reduced by a factor of 285 at spherical harmonic degree n=200 and by a factor of 1,300 at n=*** planned lower perigee of their orbits allows the new satellites to collect data at unprecedentedly lower altitudes,thus dramatically improving the spatial resolution of satellite-derived lithospheric field models,(up to 80%at n=150).In addition,lowering the apogee increases the time interval during which the satellites fly at near-Earth altitudes,thus improving the model predictions at all spherical harmonic degrees(around 52%-62%at n=150).The upper limit of the expected improvement to t

关键词： elliptical orbit satellite orbit simulation lithosphere field modelling spherical harmonics

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A Periodic Dividend Problem with Inconstant Barrier in Markovian Environment

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Acta Mathematica Sinica,English Series 2015年第2期31卷 281-294页

作者： Fang JIN Hui ou Xiang Qun yang College of Mathematics and Computer Sciences Hu'nan Normal University

Periodic dividend problem is a meaningful issue. Based on a compound binomial model with periodic dividend, we use a homogeneous, ergodic and irreducible discrete-time Markov chain to express the evolution from one period to the subsequent of the economic or the environmental and climatic conditions. We derive some properties about the model. A system of integral equations for the expectation and the r-th moment of discounted dividends until ruin time are obtained respectively. Moreover, by using of Contraction Mapping Principle, we solve the equation system and obtain the explicit expression.

关键词： Periodic dividend Markovian environment inconstant barrier ruin time discounted dividends contraction mapping principle

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Biharmonic Maps from Tori into a 2-Sphere

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Chinese Annals of Mathematics,Series B 2018年第5期39卷 861-878页

作者： Zeping WANG Ye-Lin ou Hanchun yang Department of Mathematics Yunnan University Department of Mathematics Guizhou Normal University Department of Mathematics Texas A & M University-Commerce

Biharmonic maps are generalizations of harmonic maps. A well-known result on harmonic maps between surfaces shows that there exists no harmonic map from a torus into a sphere(whatever the metrics chosen) in the homotopy class of maps of Brower degree±1. It would be interesting to know if there exists any biharmonic map in that homotopy class of maps. The authors obtain some classifications on biharmonic maps from a torus into a sphere, where the torus is provided with a flat or a class of non-flat metrics whilst the sphere is provided with the standard metric. The results in this paper show that there exists no proper biharmonic maps of degree±1 in a large family of maps from a torus into a sphere.

关键词： Biharmonic maps Biharmonic tori Harmonic maps Gauss maps Mapsinto a sphere

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Microconchids from Microbialites near the Permian-Triassic Boundary in the Zuodeng Section, Baise Area, Guangxi Zhuang Autonomous Region, South China and Their Paleoenvironmental Implications

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Journal of Earth Science 2015年第2期26卷 157-165页

作者： Hao yang Zhong-Qiang Chen Weiquan ou State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences

Abundant microconchid worm tubes were extracted from the microbialites deposit near the Permian-Triassic boundary at the Zuodeng Section, Baise area, Guangxi Zhuang Autonomous Re- gion, South China. These calcareous worm tubes were studied in both petrographic thin sections and isolated specimens using optical microscope and sensitive electronic microscope （SEM）, respectively. They are categorized into two morphological types： helically coiled and planispirally coiled tubes, which are assignable to Microconchus aberrans （Hohenstein, 1913） and M. utahesis （Zatofi et al., 2013）, respectively. The tube wall ultrastructnre is characterized by laminated micrites, which distinguish the studied microconchids from comparable microgastropods or spirorbid polychaete that usually has shell nltrastructnre of spar texture. The overwhelm majority of microconchids from the microbialite possess the planispirally coiled tubes. The lifestyle of extant, morphologically convergent spirorbids suggests that these planispirally coiled microconchids may have colonized in some local oxygenic oases probably produced by photosynthetic cyanobacteria in the oxygen-poor microbialite ecosystem in which they may have settled densely with high competition among various individuals and with other associated animals for oxygen consumption and food soucres. The deleterious environment condition of the mi- crobialite ecosystem immediately after the Permian-Triassic biocrisis is also indicated by various geochemical signals derived from the same section. Such a deleterious habitat may be inhospitable for most metazoans, but it has some local oxygenic oases that was favorable for opportunistic taxa to dwell.

关键词： Permian-Triassic microbialite microconchids paleoecology paleoenvironment.

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Mechanism of Downcutting Erosion of Debris Flow over a Movable Bed

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Journal of Mountain Science 2015年第1期12卷 243-250页

作者： Pan Hua-li Huang jiang-cheng ou Guo-qiang Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and Environment CAS Asian International Rivers Center Yunnan University

The phenomenon of debris flow is intermediate between mass movement and solid transport. Flows can be sudden, severe and destructive. Understanding debris flow erosion processes is the key to providing geomorphic explanations, but progress has been limited because the physical-mechanical properties, movement laws and erosion characteristics are different from those of sediment-laden flow. Using infinite slope theory, this research examines the process and mechanism of downcutting erosion over a moveable bed in a viscous debris flow gully. It focuses specifically on the scour depth and the critical slope for viscous debris flow,and formulas for both calculations are *** scour depth and the critical conditions of downcutting erosion are related to debris flow properties(sand volume concentration and flow depth) and gully properties(longitudinal slope,viscous and internal friction angle of gully materials,and coefficient of kinetic friction). In addition, a series of flume experiments was carried out to characterize the scouring process of debris flows with different properties. The calculated values agreed well with the experimental data. These theoretical formulas are reasonable, and using infinite slope theory to analyze down cutting erosion from viscous debris flow is feasible.

关键词： Debris flow Down cutting erosion Infinite slope theory Critical conditions Flumeexperiments

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Estimation of Land Production and Its Response to Cultivated Land Conversion in North China Plain

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Chinese Geographical Science 2011年第6期21卷 685-694页

作者： jiang Qun＇ou DENG Xiangzheng ZHAN Jinyan HE Shujin Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Center for Chinese Agricultural Policy Chinese Academy of Sciences Beo＇ing 100101 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

Food safety and its related influencing factors in China are the hot research topics currently,and cultivated land conversion is one of the significant factors influencing food safety in *** the North China Plain as the study area,this paper examines the changes of cultivated land area using satellite images,estimates land productivity from 1985 to 2005 using the model of Estimation System for Land Productivity(ESLP),and analyzes the impact of cultivated land conversion on the land *** with the grain yield data from statistical yearbooks,the results indicate that ESLP model is an effective tool for estimating land *** productivity in the North China Plain showed a slight decreasing trend from 1985 to 2005,spatially,increased from the north to the south gradu-ally,and the net changes varied in different *** land area recorded a marginal decrease of 8.0 × 105 ha,mainly converted to other land *** land conversion had more significant negative impacts on land produc-tion than land productivity *** production decreased by about 6.48 × 106 t caused by cultivated land conversion between 1985 and 2005,accounting for 91.9% of the total land production *** the land productivity increased in Anhui and jiangsu provinces,it can not offset the overall adverse effects caused by cultivated land ***,there are significant meanings to control the cultivated land conversion and improve the land pro-ductivity for ensuring the land production in the North China Plain.

关键词： land productivity land production cultivated land cultivated land conversion North China Plain

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Sprayable coating based on fluorinated silica nanocomposites with superhydrophobic and antibacterial properties for advanced concrete

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Progress in Natural Science:Materials International 2022年第4期32卷 472-481页

作者： Feng yang Wuyifan Zhou Fuhai Li Ling Yuan yangmin Diao Yinglu Liu Yuan Pu Yong Zhang Yong Zhao ou jiang Dan Wang Key Laboratory of Advanced Technology of Materials (Ministry of Education of China) Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle (Ministry of Education of China) School of Materials Science and Engineering Southwest Jiaotong University Superconductivity and New Energy R&D Center Southwest Jiaotong University School of Civil Engineering Southwest Jiaotong University State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Oncology Department The Second People's Hospital of Neijiang

The porous hydrophilic nature of concrete structures makes them highly susceptible to chemical attack and bacterial adhesion, and the durability of concrete structures gradually decreases. In this work, a kind of sprayable coating with superhydrophobic and antibacterial properties was developed, which was used for surface engineering of concrete via the hydrophilic property of concrete and capillary action. The treated surface of concrete exhibited significant superhydrophobicity, with a static water contact angle of 162.4°and a sliding angle of 5°.The water absorption values of the treated concrete samples in merged in deionized water and 3.5 wt% Na Cl solution for 7 days were measured as 1.85% and 2.71%, indicating the enhancement of water repellency by 72.03% and 80.11%, respectively. The antibacterial characterization revealed that the superhydrophobic coating enabled significantly reduced adhesion of bacteria, with the antibacterial rates of 84.57 ± 2.5% for E. coli and 90.43 ± 1.6% for S. epidermidis, respectively. The superhydrophobic coating provides hydrophobic protection for porous substrate structures and effectively reduce the corrosion damage of substrate materials, which is of practical significance for improving the durability of concrete structures.

关键词： Superhydrophobic Ultra-light Antibacterial Coating Concrete

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Surface structural engineering of carbonyl iron powder for enhancing microwave absorption and anti-oxidation performance

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Journal of Materials Science & Technology 2024年第11期178卷 201-209页

作者： Ming-Lu Huang Cheng-Long Luo Chang Sun kun-Yan Zhao Yingqing ou Ming Wang Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China Department of Chemistry National University of Singapore3 Science Drive 3117543Singapore

Surface structural engineering is desirable in modifying the surface performance of carbonyl iron powder(CIP)to enhance microwave absorption(MA)and anti-oxidation ***,the surface shape-dependent CIP absorbers are designed via surface coating with zinc oxide(ZnO)nanoparticles and then a thermal annealing *** morphology of ZnO nanoparticles which can be easily regulated by controlling the annealing temperature ultimately affects the MA performance of CIP coating with ZnO nanoparticles(CIP@ZnO).The core-shell CIP@ZnO particles with cubic cone ZnO nanoparticles exhibit ex-cellent MA performance and thermal stability in comparison to the original ***,the CIP@ZnO annealed at 350 ℃(CIP@ZnO-350)samples which have the cubic cone ZnO nanoparticles exhibit a min-imum reflection loss(RLmin)of-55.35 dB at a thickness of 2.1 mm and a maximum effective absorp-tion bandwidth(EAB)of 7.09 GHz at a thickness of 2.0 *** addition,the antioxidant property of the CIP@ZnO composite particles is abruptly enhanced,which breaks the restriction of the application of CIP at high *** superior MA performance of CIP@ZnO particles with cubic cone ZnO nanoparti-cles comes from the enhancement in surface shape-dependent multiple microwave scattering,interfacial polarization,and electromagnetic-dielectric synergism between ZnO and CIP.

关键词： Microwave absorption Carbonyl iron powder Anti-oxidation Interfacial polarization Surface structural engineering

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Physical Properties and Hydration of Cementitious Materials Prepared from Vanadium Slag and Phosphate Slag

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Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1459-1464页

作者： ZHANG Pengyu LIU kun School of Minerals Processing & Bioengineering Central South University Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South University Key Laboratory for Mineral Materials and Application of Hunan Province Central South University

The physical properties and hydration of a cementitious material, which prepared mainly from the vanadium slag and phosphate slag, were investigated. These slags were investigated can be reused as original resources to prepare cement clinker based on the fact that they mainly comprise silicon and calcium phases, respectively. In this research, a batch of cement having various grades was prepared by mixing the clinker with gypsum, tailings, and fly ash. X-ray diffraction(XRD), differential thermogravimetric(DTG) as well as scanning electron microscopy(SEM) were applied to test and analyze the physical properties and hydration of the prepared cement. Experimental results suggest that the performances of the cement meet the requirements of national standards in all aspects. Its hydration process is similar to that of common Portland cement, whose hydrates were mainly composed of C-S-H, ettringite and CH. Moreover, the addition of fine particles would accelerate cement hydration, as it provided additional surfaces to help the nucleating and growing of hydrates.

关键词： industrial slag cement physical properties hydration

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