检索结果-南通市图书馆

World Journal of Gastrointestinal Surgery 2022年第3期14卷 221-235页

作者： Li Lin si-Bo yuan Huan Guo Department of Gastrointestinal Surgery and Xiamen City Key Laboratory of Gastrointestinal Cancer Zhongshan HospitalXiamen UniversityXiamen 361000Fujian ProvinceChina

BACKGROUND Complete mesocolic excision(CME)with central vascular ligation(CVL)was proposed by Hohenberger in *** CME principle has gradually become the technical standard for colon cancer *** to achieve CME with CVL in laparoscopic right hemicolectomy(LRH)is controversial,and a unified standard approach is not yet *** recent years,the authors’team has integrated the theory of membrane anatomy,tried to combine the cephalic approach with the classic medial approach(MA)for technical optimization,and proposed a cranialmedial mixed dominant approach(CMA).AIM To explore the feasibility of operational approaches for LRH with *** In this retrospective cohort study,the clinical data of 57 patients with right-sided colon cancer(TNM stage I,II,or III)who underwent LRH with CME from January 2016 to June 2020 were collected and *** were 31 patients in the traditional MA group and 26 in the CMA *** There were no significant differences in baseline data between the two *** operation was shorter and the number of lymph nodes dissected was higher in the CMA group than in the MA group,but there was no significant difference in the number of positive lymph nodes,intraoperative blood loss,postoperative exhaust time,feeding time,postoperative hospital stay or postoperative complication *** Our study shows that the CMA is a safe and feasible procedure for LRH with CME and has a unique advantage.

关键词： Right hemicolectomy Laparoscopic surgery Complete mesocolic excision Mesocolon Embryology Colon cancer

The universal applicability of logistic curve in simulating ecosystem carbon dynamic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Geology 2020年第2期3卷 292-298页

作者： Xue-yang Yu si-yuan Ye Key Laboratory of Coastal Wetland Biogeosciences Qingdao Institute of Marine GeologyChina Geological SurveyMinistry of Natural ResourcesQingdao 266071China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China

As an S-shaped curve,the logistic curve has both high and low limit,which provides advantages in modelling the influences of environmental factors on biogeological ***,although the logistic curve and its transformations have drawn much attention in theoretical modelling,it is often used as a classification method to determine a true or false condition,and is less often applied in simulating the real data *** from the basic theory of the logistic curve,with observed data sets,this paper explored the new application scenarios such as modelling the time series of environmental factors,modelling the influence of environmental factors on biogeological processes and modelling the theoretical curve in ecology *** comparing the performance of traditional model and the logistic model,the results indicated that logistic modelling worked as well as traditional *** certain conditions,such as modelling the influence of temperature on ecosystem respiration,the logistic model is more realistic than the widely applied Lloyd-Taylor formulation under extreme *** cases confirmed that the logistic curve was capable of simulating nonlinear influences of multiple factors on biogeological processes such as carbon dynamic.

关键词： Logistic curve Mathematical modelling Theoretical research Biogeological process Geological survey engineering

Study of the impacts of upstream natural gas market reform in China on infrastructure deployment and social welfare using an SVM-based rolling horizon stochastic game analysis

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2018年第4期15卷 898-911页

作者： Yan Li Ge Wang Benjamin Mclellan si-yuan Chen Qi Zhang Academy of Chinese Energy Strategy China University of Petroleum at Beijing Graduate School of Energy Science Kyoto University

Natural gas is expected to play a much more important role in China in future decades, and market reform is crucial for its rapid market penetration. At present, the main gas fields, pipelines and liquefied natural gas(LNG) infrastructure are mainly monopolized by large state-owned companies, and one of the important market reform policies is to open up LNG import rights to smaller private companies and traders. Therefore, in the present study, a game theoretical model is proposed to analyze and compare the impacts of different market structures on infrastructure deployment and social welfare. Moreover, a support vector machine-based rolling horizon stochastic method is adopted in the model to simulate real LNG price fluctuations. Four market reform scenarios are proposed considering different policies such as business separation, third-party access(TPA) and their combinations. The results indicate that, with third-party access(TPA)entrance into the LNG market, the construction of LNG infrastructure will be promoted and more gas will be provided at lower prices, and thus the total social welfare will be improved greatly.

关键词： LNG market reform Market structure Third-party access Rolling horizon stochastic method Game theory

Group B Streptococcus causes severe sepsis in term neonates:8 years experience of a major Chinese neonatal unit

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2017年第4期13卷 314-320页

作者： Ying Dong si-yuan Jiang Qi Zhou Yun Cao Department of Neonatology Children's Hospital of Fudan UniversityShanghaiChina

Background:In contrast to industrialized countries,the clinical characteristics of neonatal sepsis caused by Group B Streptococcus (GBS) are largely unexplored in ***:A retrospective case series study was performed at a high-capacity neonatal unit in Shanghai,China from January 2008 to December *** characteristics of neonates with culture-proven GBS sepsis and antibiotic susceptibility of isolated strains were ***:Forty-three term neonates were included during the study *** majority (74.4%) had early-onset sepsis with symptoms of respiratory *** was significantly more common in lateonset sepsis than in early-onset sepsis (81.5% vs.18.8%,Psis,defined as sepsis with organ dysfunctions,and respiratory dysfunction/failure was the most common (32.6%).The in-hospital mortality rate of GBS sepsis was 4.7%.Neonates who progressed to severe sepsis had significantly lower pH level at the onset of symptoms than those who did not (7.26±0.12 vs.7.39±0.05,P=-0.006).Treatment of severe GBS sepsis required lots of medical resources including extracorporeal membrane *** tested GBS strains were susceptible to penicillin,but the rate of resistance to clindamycin (84.0%) and erythromycin (88.0%) was ***:GBS as a pathogen for neonatal sepsis has been receiving little attention in *** data demonstrated that GBS sepsis was likely to be *** recognition followed by antibiotics and adequate supportive therapies was critical for successful *** clinicians should be aware of GBS infection when treating neonatal sepsis,especially in the absence of universal maternal GBS screening.

关键词： drug resistance neonate sepsis Streptococcus agalactiae

Synthesis and characterization of X-shaped oligo(para-phenylene) derivatives functionalized with fluorene ethynylene

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第11期21卷 1374-1377页

作者： Ke Hong Ding Xing Ge Ming Zhang si Chun yuan College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225009 China Department of Fundamental Science Beijing University of Agriculture Beijing 102206 China

A series of linear and X-shaped oligo（para-phenylene） derivatives functionalized with fluorene ethynylenes 1,3 and 4 were synthesized through sequent Sonogashira coupling and Suzuki-Miyaura reaction in high *** electron-donating group-OCH3 and electron-withdrawing counterparts-CF3 were introduced to tune the spectra properties of compounds 3 and *** detail investigation of their photophysical properties in solution and film indicated that the introduction of both -OCH3 and -CF3 makes maximum emission distinct red-shift in comparison with parent compound 1,but the latter more prominently.

关键词： Sonogashira coupling Suzuki coupling Oligo(fluorene ethynylene) Electronic effect Photophysical property

A novel dandelion-based bionic proppant and its transportation mechanism in different types of fractures

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第4期21卷 2583-2599页

作者： Jun Li Ming-Yi Wu Xu Han si-yuan He Ze-Yu Lin State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina sichuan Particles Energy and Technology Co. LtdChengdu610599SichuanChina Chongqing Industry Polytechnic College Chongqing401120China Petroleum Systems Engineering Faculty of Engineering and Applied ScienceUniversity of ReginaReginaSaskatchewanS4S 0A2Canada

Low-permeability reservoirs are generally characterized by low porosity and low *** high production using the traditional method is technologically challenging because it yields a low reservoir recovery *** recent years,hydraulic fracturing technology is widely applied for efficiently exploiting and developing low-permeability reservoirs using a low-viscosity fluid as a fracturing ***,the transportation of the proppant is inefficient in the low-viscosity fluid,and the proppant has a low piling-up height in fracture *** key challenges restrict the fluid(natural gas or oil)flow in fracture channels and their functional flow areas,reducing the profits of hydrocarbon *** study aimed to explore and develop a novel dandelion-bionic proppant by modifying the surface of the proppant and the *** structure was similar to that of dandelion seeds,and it had high transport and stacking efficiency in low-viscosity liquids compared with the traditional ***,the transportation efficiency of this newly developed proppant was investigated experimentally using six different types of fracture models(tortuous fracture model,rough fracture model,narrow fracture model,complex fracture model,large-scale single fracture model,and small-scale single fracture model).Experimental results indicated that,compared with the traditional proppant,the transportation efficiency and the packing area of the dandelion-based bionic proppant significantly improved in tap water or low-viscosity *** with the traditional proppant,the dandelionbased bionic proppant had 0.1-4 times longer transportation length,0.3-5 times higher piling-up height,and 2-10 times larger placement *** newly developed proppant also had some other extraordinary *** tortuosity of the fracture did not influence the transportation of the novel *** proppant could easily enter the branch fracture and narrow fracture with a hig

关键词： Dandelion-based bionic proppant Low-viscosity fracturing fluid Unconventional reservoir Volumetric fracturing stimulation

Enhancing performance of GaN-based LDs by using GaN/InGaN asymmetric lower waveguide layers

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第7期31卷 321-326页

作者： Wen-Jie Wang Ming-Le Liao Jun yuan si-yuan Luo Feng Huang Microsystem and Terahertz Research Center China Academy of Engineering PhysicsChengdu 610200China Institute of Electronic Engineering China Academy of Engineering PhysicsMianyang 621999China

The effects of Ga N/In Ga N asymmetric lower waveguide(LWG)layers on photoelectrical properties of In Ga N multiple quantum well laser diodes(LDs)with an emission wavelength of around 416 nm are theoretically investigated by tuning the thickness and the indium content of In Ga N insertion layer(In Ga N-IL)between the Ga N lower waveguide layer and the quantum wells,which is achieved with the Crosslight Device simulation Software(PIC3D,Crosslight Software Inc.).The optimal thickness and the indium content of the In Ga N-IL in lower waveguide layers are found to be 300 nm and 4%,*** thickness of In Ga N-IL predominantly affects the output power and the optical field distribution in comparison with the indium content,and the highest output power is achieved to be 1.25 times that of the reference structure(symmetric Ga N waveguide),which is attributed to the reduced optical absorption loss as well as the concentrated optical field nearby quantum ***,when the thickness and indium content of In Ga N-IL both reach a higher level,the performance of asymmetric quantum wells LDs will be weakened rapidly due to the obvious decrease of optical confinement factor(OCF)related to the concentrated optical field in the lower waveguide.

关键词： asymmetric waveguide structure InGaN multiple quantum wells optical absorption loss optical field distribution

Nature-inspired design of droplet-synthesized polymeric nanoelectrode for photoelectrochemical microRNA sensing within single cells

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2024年第2期69卷 159-162页

作者： si-yuan Yu Yi-Li Liu Zheng Li Dechen Jiang Jing-Juan Xu Hong-yuan Chen Wei-Wei Zhao State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Nanoelectrodes have been shown to be powerful tools for nanoscopic research on single entities,deepening the understanding of heterogeneity and stochastics for single molecules,nanoparticles and cells[1–3].However,despite their importance,current nanoelectrode preparations are highly restrained to flame/electrochemical etching,metal sputtering,electrochemical deposition,etc.[3],resulting in a limited range of materials(mainly gold,platinum and carbon)for potential-resolved detection of redox-active species(Table S1 online).The enrichment of preparation methods to introduce novel materials and mechanisms should prove significant for the development of nanoelectrodes.

关键词： electrode deepening restrained

Therapeutic potential of dental pulp stem cells and their derivatives:Insights from basic research toward clinical applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Stem Cells 2022年第7期14卷 435-452页

作者： Sheng-Meng yuan Xue-Ting Yang si-yuan Zhang Wei-Dong Tian Bo Yang State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesEngineering Research Center of Oral Translational MedicineNational Engineering Laboratory for Oral Regenerative MedicineWest China Hospital of StomatologySichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Oral and Maxillofacial Surgery West China Hospital of StomatologySichuan UniversityChengdu 610041Sichuan ProvinceChina

For more than 20 years,researchers have isolated and identified postnatal dental pulp stem cells(DPSCs)from different teeth,including natal teeth,exfoliated deciduous teeth,healthy teeth,and diseased *** mesenchymal stem cell(MSC)-like immunophenotypic characteristics,high proliferation rate,potential for multidirectional differentiation and biological features were demonstrated to be superior to those of bone marrow *** addition,several main application forms of DPSCs and their derivatives have been investigated,including stem cell injections,modified stem cells,stem cell sheets and stem cell *** vitro and in vivo administration of DPSCs and their derivatives exhibited beneficial effects in various disease models of different tissues and ***,DPSCs and their derivatives are regarded as excellent candidates for stem cell-based tissue *** this review,we aim to provide an overview of the potential application of DPSCs and their derivatives in the field of regenerative *** describe the similarities and differences of DPSCs isolated from donors of different ages and health *** methodologies for therapeutic administration of DPSCs and their derivatives are introduced,including single injections and the transplantation of the cells with a support,as cell sheets,or as cell *** also summarize the underlying mechanisms of the regenerative potential of DPSCs.

关键词： Dental pulp stem cells Cell injections Modified cells Cell sheets Cell spheroids Regeneration

Antistatic Structural Color and Photoluminescent Membranes from Co-assembling Cellulose Nanocrystals and Carbon Nanomaterials for Anti-counterfeiting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第10期38卷 1061-1071,I0005页

作者： si-yuan Liu Yan-Bin Gong Shan Ma Yu-Huan Wang Lin Gan Jin Huang School of Chemistry and Chemical Engineering Chongqing Key Laboratory of Soft:Matter Material Chemistry and Function Manufacturingand"the Belt and Road(B&R)"International Joint Research Laboratory of Sustainable MaterialsSouthwest UniversilyChongqing 400715China Cllege ofChemistryand Molecular Science Wuhan UniversityWuhan 430072 China

Static charges on optical ant-counterfeiting membranes may lead to materials structural changes,dust stain aggravation,and misreading of optical *** conductive particles is a common way to transfer accumulative charges,but the key issue is how to achieve high dispersion and effective distribution of *** to the strategy of assembly-induced structural colors,cellulose nanocrystals(CNCS)were employed as a solid emulsifier to stabilize hydrophobic carbon nanoparticles(CNPs)in aqueous media;*** solvent evaporation-modulated co-assembly under a condition of 30°C and 20 RH%,the binary suspensions containing 2wt% CNC and CNPs with the equivalent concentration relative to CNC ranged from 1:40 to 1:10 were used to prepare antistatic composite *** chemistry regulation of CNCs was applied to optimize the dispersiblity of CNPs and the orientation of assembled CNC arrays,and the hydrophilic CNCS were more favorable for dispersion and assembly of binary suspension ***,one dimension carbon nanotube(CNT)and zero-dimension carbon black(CB)were found to show better dispersibility than two dimension graphene,which was verified by a semi-quantitative theoretical ***,the stable binary systems of CNT/CNC and CB/CNC were chosen for co-assembly as membranes,and the uniaxial orientation could be optimized as the fll-width of 9.8°at half maximum deviation angle while the surface resistivity could also drop down to 3.42 × 102 *** structural color character of such paper homology and antistatic integrated membranes contributes to optical information hiding and-reading,and shows great potential as optical mark recognition materials for electrostatic discharge protective packaging and *** applications.

关键词： Cellulose nanocrystal Solid-state photoluminescent Carbon nanoparticles Antistatic