检索结果-南通市图书馆

Cardiovascular Innovations and Applications 2018年第B5期3卷 41-59页

作者： Jerold S.Shinbane philip m.chang Division of Cardiovascular medicine Keck School of Medicine of the University of Southern California1510 San Pablo StreetSuite 32290033 Los AngelesCAUSA Congenital Heart Center Departments of Pediatrics and Internal MedicineUniversity of Florida College of Medicine1600 SW Archer RoadPO Box 10029632610 GainesvilleFLUSA

Atrial arrhythmias,including atrial fibrillation,in the setting of congenital heart disease(CHD)are epidemiologically and mechanistically different from those encountered in the general *** arrhythmias occur at younger ages in patients with CHD,and are frequently degenerative and *** epidemiology,incidence,and prevalence of the spectrum of atrial arrhythmias,including atrial fibrillation,vary according to the specific CHD type,prior treatment,and residual and ongoing structural and functional *** combined impact of incisional scars,abnormal hemodynamics,atrial chamber dilatation,and increases in atrial wall thickness and distribution of fi brosis results in a highly dynamic and continuously changing atrial substrate that is highly predisposed to *** the multiple substrates,individualized therapeutic plans can include pharmacologic therapy,catheter-based ablation,and surgical therapies performed concomitantly with primary surgical intervention for hemodynamically significant sequelae of *** imaging with CT or mRI can provide valuable information for decision making and procedural *** of novel therapeutic technologies and pharmacologic agents necessitates special considerations when applied to the CHD population and requires greater study in specific subsets of CHD patients.

关键词： congenital heart disease arrhythmia atrial fibrillation

Liver transplantation as an alternative for the treatment of neuroendocrine liver metastasis: Appraisal of the current evidence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2024年第2期23卷 146-153页

作者： philip C.muller matthias Pfister Dilmurodjon Eshmuminov Kuno Lehmann Department of Surgery and Transplantation University Hospital ZurichRämistrasse 100Zurich CH-8091Switzerland

Background:Liver transplantation(LT)for neuroendocrine liver metastases(NELm)is still in *** comparing LT with liver resection(LR)for NELm are scarce,as patient selection is heterogeneous and experience is *** goal of this review was to provide a critical analysis of the evidence on LT versus LR in the treatment of *** sources:A scoping literature search on LT and LR for NELm was performed with Pubmed,including English articles up to march ***:International guidelines recommend LR for NELm in resectable,well-differentiated tumors in the absence of extrahepatic metastatic disease with superior results of LR compared to systemic or liver-directed *** liver surgery has extended resectability criteria whilst entailing increased perioperative risk and short disease-free *** highly selected patients(based on the milan criteria)with unresectable NELm,oncologic results of LT are *** factors include tumor biology(G1/G2)and burden,waiting time for LT,patient age and extrahepatic *** on low-level evi-dence,LT for low-grade NELm within the milan criteria resulted in improved disease-free survival and overall survival compared to *** benefits of LT were lost in patients beyond the milan ***:With adherence to strict selection criteria especially tumor biology,LT for NELm is becoming a valuable option providing oncologic benefits compared to *** evidence suggests even stricter selection criteria with regard to tumor biology.

关键词： Liver transplantation Neuroendocrine liver metastases Liver resection Selection criteria Tumor biology

Effect of heat treatment on microstructure and mechanical properties of selective laser-melted PH13-8mo stainless steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第4期31卷 945-955页

作者： Yuan Zhang Xiang Liu chang-jun Wang chang Liu School of material Science and Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina Central Iron&Steel Research Institute Co. Ltd.Beijing 100081China

PH13-8mo stainless steel powder with high sphericity and well fluidity was prepared by the plasma rotating electrode *** formed parts with ultra-high purity were manufactured by selective laser *** tensile and impact mechanical properties of the printed parts under three heat treatment regimes were compared to those without heat *** microstructure,grain orientation and phase composition were characterized by electron-backscatter diffraction,X-ray diffraction and transmission electron *** characterization results reveal that the addition of heat treatment makes the grains enlarge,and after different heat treatments,the average grain size from 1.51μm in the printed state increases to 2.78,3.09 and 2.06μm,*** formed parts are mainly composed of martensite and retained ***,the NiAl and m23C precipitates form,which are the major strengthening phases of PH13-8mo stainless *** optimal heat treatment process is 925℃×1 h water cooling(WC)+0℃×2 h air cooling(AC)+540℃×4 h *** this heat treatment process,PH13-8mo formed parts have the optimal comprehensive mechanical properties:the tensile strength,yield strength and impact energy KU2 are 1492 mPa,1432 mPa and 63 J,*** strengthening and toughening via heat treatment are mainly attributed to dislocation strengthening,the formation of NiAl and m23Co precipitates and the change of volume fraction of the retained austenite.

关键词： High-strength stainless steel-Selective laser melting-Heat treatment microstructure mechanical property

Generic modeling and Control Framework for Power Systems Dominated by Power Converters Connected Through a Passive Transmission and Distribution Grid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第1期10卷 292-301页

作者： Qing-chang Zhong marcio Stefanello Department of Electrical and Computer Engineering Illinois Institute of TechnologyChicagoIL 60616USA Syndem LLC USA.M.Stefanello is with the Fundacao Universidade Federal do Pampa at AlegreteRS97546-550Brazil

In this paper,a compact mathematical model having an elegant structure,together with a generic control framework,are proposed for generic power systems dominated by power converters that are interconnected through a passive transmission and distribution(T&D)grid,by adopting the port-Hamiltonian(pH)systems theory and the fundamental circuit *** models of generic T&D lines are developed and then the model of a generic T&D grid is *** the proposed control framework,the controlled converters are proven to be passive and Input-to-State Stable(ISS).The compact mathematical model is scalable and can be applied to power systems with multiple power electronic converters with generic passive controllers,passive local loads,and different types of passive T&D lines connected in a meshed configuration without self-loops,so it is very ***,the resulting power system is proven to be ISS as *** analysis is carried out without assumptions on constant frequency/voltage,constant loads,and/or lossless networks,except the need of passivity for all parts involved,and without using the Clarke/Park transformations or the graph *** simplify the presentation,three-phase balanced systems are adopted but the results can be easily adapted for single-phase or unbalanced three-phase systems.

关键词： Input-to-State Stable(ISS) passivity,portHamiltonian(pH)systems Power electronic converters dominated power systems Synchronized and Democratized(SYNDEm)grid architecture

Greedy Lattice Paths with General Weights

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta mathematica Sinica,English Series 2024年第9期40卷 2213-2222页

作者： Yin Shan chang An Qi ZHENG College of mathematics Sichuan UniversityChengdu 610065P.R.China

Let{X_(v):v∈Z^(d)}be *** *** S(π)=Σ_(v∈π)X_(v)be the weight of a self-avoiding lattice pathπ.Let m_(n)=max{S(π):πhas length n and starts from the origin}.We are interested in the asymptotics of mn as n→∞.This model is closely related to the first passage percolation when the weights{X_(v):v∈Z^(d)}are non-positive and it is closely related to the last passage percolation when the weights{X_(v):v∈Z^(d)}are *** general weights,this model could be viewed as an interpolation between first passage models and last passage ***,this model is also closely related to a variant of the position of right-most particles of branching random *** the two assumptions that∃α>0,E(X_(0)^(+))^(d)(log^(+)X_(0)^(+))^(d+α)mber m such that mn/n converges to a deterministic constant m in L^(1)as n tends to *** under the stronger assumptions that∃α>0,E(X_(0)^(+))^(d)(log^(+)X_(0)^(+))^(d+α)m_(n)/n converges to the same constant m almost surely as n tends to infinity.

关键词： Last passage percolation first passage percolation greedy lattice path

A novel homozygous missense variant in ARSK causes mPS X,a new subtype of mucopolysaccharidosis

在线全文

学校读者我要写书评

暂无评论

Genes & Diseases 2024年第3期11卷 87-90页

作者： miao Sun Cornelia K.Kaminsky philip Deppe mai-Brittllse Frederic m.Vaz Barbara Plecko Torben Lubke Linda m.Randolph Division of Genomic medicine Department of Pathology and Laboratory MedicineChildren's Hospital Los Angeles/Keck School of Medicine of USCLos AngelesCA 90027USA Department of Radiology Children's Hospital Los Angeles/Keck School of Medicine of USCLos AngelesCA 90027USA Department of Chemistry BiochemistryBielefeld UniversityBielefeld 33615Germany Amsterdam UmC Location University of Amsterdam Department of Clinical Chemistry and PediatricsLaboratory Genetic Metabolic DiseasesEmma Children's HospitalMeibergdreef 9Amsterdam 1100 DEthe Netherlands Amsterdam Gastroenterology Endocrinology metabolism Inborn Errors of MetabolismAmsterdam 1105 BKthe Netherlands Core Facility metabolomics Amsterdam UMC Location University of AmsterdamAmsterdam 1100DDthe Netherlands Department of Pediatrics Division of General PediatricsMedical Universityof GrazGraz8036Austria Division of medical Genetics Department of PediatricsChildren's Hospital Los Angeles/Keck School of Medicine of USCLos AngelesCA 90027USA

mucopolysaccharidoses(mPS)are a group of rare inborn errors of metabolism caused by defective lysosomal enzymes which prevent cells from degrading and recycling certain carbohydrates and fats,resulting in the storage of glycosaminoglycans in cells throughout the *** leads to multisystem abnormalities involving bone,connective tissues,brain,blood,spinal cord,skin,and other tissues.

关键词： metabolism doses polys

Confluence of asymmetric catalysis and electrosynthesis in sustainable chemical transformations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第3期67卷 755-758页

作者： Qinglin Zhang Kang Liang chang Guo Hefei National Research Center for Physical Sciences at the microscale and Department of Chemistry University of Science and Technology of ChinaHefei 230026China

Electrosynthesis has gained widespread recognition for its extraordinary ability to precisely control the redox *** outstanding capability enables the direct conversion of non-functionalized substrates into reactive intermediates by utilizing easily accessible starting materials, eliminating the need for preliminary functionalization procedures and allowing for unconventional bond activations.

关键词： Confluence of asymmetric catalysis and electrosynthesis in sustainable chemical transformations

From ore to mOF: A case of mIL-100(Fe) production from iron ore concentrates

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:materials International 2024年第01期34卷 66-73页

作者： miao chang Chiyao Tang Chong-Chen Wang Chen Zhao Beijing Key Laboratory of Functional materials for Building Structure and Environment Remediation School of Environment and Energy Engineering Beijing University of Civil Engineering and Architecture

Within this work, iron ore concentrates instead of elemental iron Fe0and iron salts like Fe（NO3）3and FeCl3were selected as iron source to prepare mIL-100（Fe）(labeled as mIL-100（Fe）-ore). The corresponding synthesis cost is reduced to half of the mIL-100（Fe） produced from elemental iron and iron salts. As well, the unreacted iron ore concentrates can be easily separated from the as-prepared mIL-100（Fe）-ore by magnetic to facilitate the purification process, free of the strong acids to wash the residual iron. The as-obtained mIL-100（Fe）-ore with Langmuir surface area up to 2281.6 m2g-1displayed long-term chemical stability. Furthermore, the sorption capacity of mIL-100（Fe）-ore towards malachite green（mG） is up to 522.3 mg g-1at 25℃ and initial pH = 3.2, higher than that of mIL-100（Fe） yielded by conventional hydrothermal process. Finally, the production cost and life cycle assessment of mIL-100（Fe）-ore were compared with other traditional production procedures. The results revealed that our work greatly reduced the synthesis cost and enhanced the environmental sustainability.

关键词： metal-organic framework Iron ore concentrates Adsorption Life cycle assessment

A methodology for laser tool setters calibration and its precise mathematical model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第7期37卷 564-581页

作者： Tao FANG Zixi FANG Ze Zhong CHEN Zhiyong chang School of mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China Gina Cody School of Engineering and Computer Science Concordia UniversityMontrealQuebec H3G 1M8Canada changsha Optimum CNC Corporation Changsha 410221China Institute for Aero-engine Smart Assembly of Shaanxi Province Xi’an 710072China

On-machine tool setting is a pivotal approach in achieving intelligent manufacturing,and laser tool setters have become a crucial component of smart machine *** tool setters play a crucial role in precisely measuring the dimensions of cutting tools during the part machining process,focusing on tool length and *** a measuring instrument,the positions of the laser axis of the laser tool setter need to be accurately calibrated before ***,in actual calibration scenarios,traditional calibration methods face challenges due to installation errors in the tool setter and geometric errors in the measuring *** address this issue,this study proposes a novel calibration ***,the calibration mechanism of the laser beam axis is *** on the accurate mathematical model of the laser beam and the measuring rod,and using the polygon clipping algorithm,the mathematical mechanism of the laser tool setter’s work is ***,a novel method is introduced to calculate the compensation distance between the laser beam reference point and the rod bottom center point at each moment during ***,by utilizing the kinematic chain of the tool setter calibration system,a new calibration method is developed to accurately calibrate the position of the laser beam axis in the machine tool coordinate ***,the accuracy of the calibration method is verified through simulation experiments and calibration *** method improves the calibration accuracy of the tool setter,and the mathematical model of the laser tool setter can be extended to the measurement of tools,thereby improving the precision of tool *** research significantly improves the efficient production performance of smart machine tools.

关键词： On-machine tool setting Smart machine tools mathematical model Calibration method Laser tool sette

Ionic Liquid-Enhanced Assembly of Nanomaterials for Highly Stable Flexible Transparent Electrodes

在线全文

学校读者我要写书评

暂无评论

Nano-micro Letters 2024年第7期16卷 441-455页

作者： Jianmin Yang Li chang Xiqi Zhang Ziquan Cao Lei Jiang Key Laboratory of Bio-Inspired materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China College of Chemistry and Chemical Engineering Chongqing University of TechnologyChongqing 400054People’s Republic of China Binzhou Institute of Technology Binzhou 256600People’s Republic of China Nanomics Biotechnology Co. Ltd.HangzhouPeople’s Republic of China

The controlled assembly of nanomaterials has demon-strated significant potential in advancing technological ***,achieving highly efficient and low-loss assembly technique for nanomate-rials,enabling the creation of hierarchical structures with distinctive func-tionalities,remains a formidable ***,we present a method for nanomaterial assembly enhanced by ionic liquids,which enables the fabrication of highly stable,flexible,and transparent electrodes featuring an organized layered *** utilization of hydrophobic and non-volatile ionic liquids facilitates the production of stable interfaces with water,effectively preventing the sedimentation of 1D/2D nanomaterials assembled at the ***,the interfacially assembled nanomaterial monolayer exhibits an alternate self-climbing behavior,enabling layer-by-layer transfer and the formation of a well-ordered mXene-wrapped silver nanowire network *** resulting composite film not only demonstrates exceptional photoelectric performance with a sheet resistance of 9.4Ωsq^(-1) and 93%transmittance,but also showcases remarkable environmental stability and mechanical *** noteworthy is its application in transparent electromagnetic interference shielding materials and triboelectric nanogenerator *** research introduces an innovative approach to manufacture and tailor functional devices based on ordered nanomaterials.

关键词： Ionic liquids Assembly Silver nanowires mXene nanosheets Flexible transparent electrodes