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Lower extremity peripherally inserted central catheter placement ectopic to the ascending lumbar vein:A case report

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World Journal of Clinical Cases 2024年第8期12卷 1430-1436页

作者： Xiao-Ju Zhu Ling Zhao Na Peng jia-Min Luo shui-Xia Liu Cancer Center Daping HospitalArmy Medical UniversityChongqing 400042China

BACKGROUND Peripherally inserted central catheters(PICCs)are an essential infusion route for oncology patients receiving intravenous treatments,but lower extremity veni-puncture is the preferred technique for patients with superior vena cava syndrome(SVCS).We report the case of a patient with a lower extremity PICC ectopic to the ascending lumbar vein,to indicate and verify PICC catheterisation in the lower extremity is safe and *** hope to provide different per-spectives for clinical PICC venipuncture to get the attention of *** SUMMARY On 24 August 2022,a 58-year-old male was admitted to our department due to an intermittent cough persisting for over a month,which worsened 10 d *** and laboratory investigations suggested the patient with pulmonary malignancy and *** was not an absolute contraindication in this *** extremity venipuncture is the preferred technique because administering upper extremity venous transfusion to patients with SVCS can exacerbate oedema in the head,neck,and upper *** patient and his family were informed about the procedure,and informed consent was *** successful puncture and prompt treatment,the patient was discharged,experiencing some relief from *** Inferior vena cava catheterisation is rare and important for cancer patients with SVCS,particularly in complex situations involving ectopic placement.

关键词： Superior vena cava syndrome Peripherally inserted central catheter Ascending lumbar vein Complications Case report

Magnesium isotope geochemistry of the carbonate-silicate system in subduction zones

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National Science Review 2022年第6期9卷 23-33页

作者： shui-Jiong Wang Shu-Guang Li State Key Laboratory of Geological Processes and Mineral Resources and Institute of Earth SciencesChina University of Geosciences (Beijing) CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of China

The lighter magnesium(Mg) isotopic signatures observed in intraplate basalts are commonly thought to result from deep carbonate recycling, provided that the sharp difference in Mg isotopic composition between surface carbonates and the normal mantle is preserved during plate subduction. However, deep subduction of carbonates and silicates could potentially fractionate Mg isotopes and change their chemical compositions. Subducting silicate rocks that experience metamorphic dehydration lose a small amount of Mg, and preserve the original Mg isotopic signature of their protoliths. When the dehydrated fluids dissolve carbonate minerals, they may evolve into lighter Mg isotopic compositions. The solubility of carbonate minerals in fluids decreases in the order of calcite, aragonite, dolomite, magnesite and siderite, leading to selective and partial dissolution of carbonate minerals along the subduction path. At the island arc depth(70–120 km), the metamorphic fluid dissolves mainly Mg-poor calcites, and thus the fluid has difficulty modifying the Mg isotopic system of the mantle wedge and associated arc basalts. At the greater depth of the back arc system or continental margin(>150 km), the supercritical fluid can dissolve Mg-rich carbonate minerals, and its interaction with the mantle wedge could significantly imprint the light Mg isotopic signature onto the mantle rocks and derivatives. Meanwhile, the carbonate and silicate remaining within the subducting slab could experience elemental and isotopic exchange, during which the silicate can obtain a light Mg isotopic signature and high CaO/Al2O3, whereas the carbonates, particularly the Ca-rich limestone, shift Mg isotopes and Mg O contents towards higher values. If this isotopic and elemental exchange event occurs widely during crustal subduction, subducted Ca-rich carbonates can partially transform into being Mg-rich, and a portion of recycled silicates(e.g. carbonated eclogites) can have light Mg isotopic composition

关键词： magnesium isotope fractionation deep carbon cycle subduction carbonate

Nonadiabatic Phase and Persistent Currents for System of Spin-1／2 Particles in Presenceof Electromagnetic Fields and Spin-Orbit Interaction

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Communications in Theoretical Physics 2004年第2期41卷 305-310页

作者： LINian-Bei MAZhong-shui StateKeyLaboratoryforMesoscopicPhysicsandDepartmentofPhysics PekingUnivcrsityBeijing100871China

We present a comprehensive view and details of calculations on Aharonov-Anandan phase for the charged particles in the external electric and magnetic fields for a nonadiabatic *** derive,with consideration of a spin-orbit interaction and Zeemann Splitting,the persistent currents as a response to an Aharonov-Casher topological interference effect in one-dimensional mesoscopic *** also establish a connection to Berry adiabatic phase with deduced dynamical-nature dependence in the nonadiabatic *** second quantization representation has also been employed in exhibition of persistent currents in the many-body case.

关键词： Aharonov-Casher effect spin persistent current

UNIFORMITY ASSESSMENT OF CARBON FIBRES DISPERSION IN CEMENT PASTE BY IMPEDANCE MEASUREMENTS

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Journal of Wuhan University of Technology(Materials Science) 1999年第1期14卷 52-57页

作者： shui, Zhonghe Stroeven, Piet Wuhan Univ Technol Coll Mat Sci & Technol Wuhan 430070 Peoples R China Delft Univ Technol Fac Civil Engn NL-2600 AA Delft Netherlands

An alternating current was applied to measure the impedance of a hardened cement paste with various contents of carbon fibres. When the free water content in the hardened cement paste is 90%-98%, and the measuring frequency 500 Hz, an approximate linear relationship was found between fibre content and impedance of the composite. Based on this relationship, a new attempt was made to evaluate the dispersion uniformity of carbon fibres in cement paste by impedance measurement. The standard deviation S and the coefficient of vriation S/X over bar //i of impedance of the fibre-cement specimens randomly taken locating in different points were used as main parameters for the uniformity assessment. As a case, four different mixing processes were designed for dispersing carbon fibres into the cement paste. The results demonstrate that the relative longer mixing time increases the dispersion uniformity of carbon fibres in cement paste, and the addition of the water reducer dramatically improves the uniformity due to the change of the fluidity of the paste. The ground fly ash can increase the uniformity to a certain extent. (Author abstract) 6 Refs.

关键词： carbon fibers uniformity assessment fiber concrete

Gamma-Dirichlet algebra and applications

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Frontiers of Mathematics in China 2014年第4期9卷 797-812页

作者： shui FENG Fang XU Department of Mathematics and Statistics McMaster University Hamilton Ont L8S 4K1 Canada Canadian Imperial Bank of Commerce 21 Melinda St Toronto Ont M5L 1B9 Canada

The Gamma-Dirichlet algebra corresponds to the decomposition of the gamma process into the independent product of a gamma random variable and a Dirichlet process. This structure allows us to study the properties of the Dirichlet process through the gamma process and vice versa. In this article, we begin with a brief survey of several existing results concerning this structure. New results are then obtained for the large deviations of the jump sizes of the gamma process and the quasi-invariance of the two-parameter Poisson-Dirichlet distribution. We finish the paper with the derivation of the transition function of the Fleming-Viot process with parent independent mutation from the transition function of the measure-valued branching diffusion with immigration by exploring the Gamma-Dirichlet algebra embedded in these processes. This last result is motivated by an open R. C. Gritfiths. problem proposed by S. N. Ethier and

关键词： Coalescent Dirichlet process gamma process quasi-invariant,random time-change

Codimension 3 Non-resonant Bifurcations of Rough Heteroclinic Loops with One Orbit Flip

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Chinese Annals of Mathematics,Series B 2006年第6期27卷 657-674页

作者： Shuliang shui Deming ZHU College of Mathematics Physics and Information Engineering Zhejiaag Normal University Jinhua 321004 Zhejiang China College of Sciences Shanghai University Shanghai 200436 China Department of Mathematics East China Normal University Shanghai 200062 China

Heteroclinic bifurcations in four dimensional vector fields are investigated by setting up a local coordinates near a rough heteroclinic loop. This heteroclinic loop has a principal heteroclinic orbit and a non-principal heteroclinic orbit that takes orbit flip. The existence, nonexistence, coexistence and uniqueness of the 1-heteroclinic loop, 1-homoclinic orbit and l-periodic orbit are studied. The existence of the two-fold or three-fold 1-periodic orbit is also obtained.

关键词： Bifurcation Heteroclinic loop Non-resonance Orbit flip Periodic orbit

Crystallization Kinetics Study on Magnetron-Sputtered Amorphous TiA1 Alloy Thin Films

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Chinese Physics Letters 2014年第4期31卷 100-104页

作者： shui Lu-Yu YAN Biao School of Materials Science and Engineering Tongji University Shanghai 201804 Shanghai Key Lab of D&A for Metal-Functional Materials Shanghai 201804

Crystallization kinetics of magnetron-sputtered amorphous TiAl ahoy thin films is investigated by differential scanning calorimetry through isothermal analysis and non-isotherm analysis. In non-isothermai analysis, the Kissinger method and the Ozawa method are used to calculate the apparent activation energy and local activation energy, respectively, in the crystallization processes of amorphous TiA1 thin films. Furthermore, the crystallization mechanism is discussed from the investigation of the A vrami exponent by isothermal analysis. In addition, x-ray diffraction is utilized to reveal the grain orientation and evolution during the crystallization of TiA1 thin fihns.

关键词： CRYSTALLIZATION MAGNETRONS AMORPHOUS alloys THIN films DIFFERENTIAL scanning calorimetry X-ray diffraction

Pore pressure built-up in hydrate-bearing sediments during phase transition: A poromechanical approach

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Petroleum Science 2023年第1期20卷 482-494页

作者： shui-Tao Zhang Lin-Lin Wang State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China Department of Offshore Oil and Gas Engineering College of Safety and Ocean EngineeringChina University of Petroleum(Beijing)Beijing102249China

Due to the density contrast between the hydrate and methane gas,the pore pressure is accumulated in the sediment during the decomposition process of methane *** accumulation of pore pressure decreases the magnitude of effective stress,further triggering potential geological disasters such as *** paper establishes a theoretical framework to investigate the evolution of fluid pressure in the hydrate-bearing sediments during the decomposition *** model consists of two parts:an unsaturated thermo-poromechanical constitutive law as well as a phase equilibrium *** with the existing studies,the present work incorporates the effect of pore volume change into the pressure built-up *** addition,the capillary effect is considered,which plays a nontrivial role in fine-grained *** on this model,the evolution of fluid pressure is investigated in undrained *** is shown that four mechanisms mainly contribute to the pressure built-up:the density contrast between decomposing hydrate and producing fluid,the variation of pore volume,the compaction of hydrate due to variation of capillary pressure,and the thermal deformation of pore constituents induced by temperature *** these mechanisms,the density contrast dominates the pore pressure *** the combined effect of these contributions,the evolution of fluid pressure exhibits a strong nonlinearity during the decomposition process and can reach up to dozens of mega ***,this high-level pressure built-up results in a significant tensile strain,yielding potential fracturing of the sediment.

关键词： Methane hydrate Excess fluid pressure Poromechanical Phase equilibrium

Securing Cloud Data Using a Pirate Scheme

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Chinese Journal of Electronics 2017年第6期26卷 1289-1296页

作者： CHENG Hongbing QIAN Manyun YU shui College of Computer Science Zhejiang University of Technology State Key Laboratory for Novel Software Technology Nanjing University School of Information Technology Deakin University

Inspired by the approach of smart pirates dealing with their treasures, the paper proposed a scheme to protect the data security and privacy in cloud computing. In the proposed scheme, cloud data will be divided into some sequenced or logical blocks. These data blocks will be distributed among cloud storage service *** of protecting the data themselves, the proposed scheme protects the mapping of the data elements on each provider. Comprehensive analysis and simulation are designed to verify the proposed scheme, the results show that it is secure for cloud data, and the real implementation on Amazon S3 also indicates that the proposed scheme is feasible and efficient for the cloud data storage.

关键词： Cloud computing Data security Pirate Storage