检索结果-南通市图书馆

Frontiers of Medicine 2013年第4期7卷 520-522页

作者： eric C.H.Lai Department of Surgery Pamela Youde Nethersole Eastern HospitalChai WanHong KongChina

I read with great interest the consensus and guideline of laparoscopic hepatectomy,which was originated from the experts in China[1].This is a significant step forward in minimally invasive liver *** development of minimally invasive liver surgery over the last 2 decades has a great impact on the surgical practice in China,and the other parts of the *** potential advantages of laparoscopic hepatectomy are those of minimal access surgery(Table 1).

关键词： Surgery hepatectomy surgery

Toward managing mixed-species stands： from parametrization to prescription

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2017年第4期4卷 286-302页

作者： Hans Pretzsch eric K. Zenner Chair for Forest Growth and Yield Science Center of Life and Food Sciences Weihenstephan Technical University of Munich Hans-Carl-von Carlowitz-Platz 2 85354 Freising Germany

A better understanding and a more quantitative design of mixed-species stands will contribute to more integrative and goal-oriented research in mixed-species forests. Much recent work has indicated that the structure and growth of mixed species forests may fundamentally differ from monocultures. Here we suggest how to progress from the present accumulation of phenomenological findings to a design of mixed-species stands and advanced silvicultural prescriptions by means of modelling. First, the knowledge of mixing effects on the structure and growth at the stand, species, and individual tree level is reviewed, with a focus on those findings that are most essential for suitable modelling and silvicultural designs and the regulation of mixed stands as opposed to monocultures. Then, the key role of growth models, stand simulators, and scenario assessments for designing mixed species stands is discussed The next section illustrates that existing forest stand growth models require some fundamental modifications to become suitable for both monocultures and mixed-species stands. We then explore how silvicultural prescriptions derived from scenario runs would need to be both quantified and simplified for transfer to forest management and demonstrated in training plots. Finally, we address the main remaining knowledge gaps that could be remedied through empirical research.

关键词： Multiplicative mixing effects Overyielding Overdensity Modelling mixing effects Scenario analysis,Silvicultural prescriptions Practical guidelines

Enhanced mid-to-near-infrared second harmonic generation in silicon plasmonic microring resonators with low pump power

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2014年第5期2卷 143-149页

作者： Jihua Zhang eric Cassan Xinliang Zhang Wuhan National Laboratory for Optoelectonics&School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Institut d’Electronique Fondamentale UniversitéParis-SudOrsay 91405France e-mail:eric.cassan@u‑psud.fr

We propose an efficient and low-power second harmonic generation(SHG)process in a silicon-compatible hybrid plasmonic microring *** making the microring resonator doubly resonant at the fundamental wavelength of 3.1μm and second harmonic wavelength of 1.55μm,the SHG efficiency is enhanced by almost two orders of magnitude when compared to the previous result induced in a straight plasmonic waveguide.A SHG efficiency of 13.71%is predicted for a low pump power of 20 mW in a ring with radius of 2.325μ*** device provides a potential route for realizing efficient frequency conversion between mid-infrared and near-infrared wavebands on a chip.

关键词： pump resonator power

Modifications of ALPPS–from complex to more complex or from complex to less complex operations

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 2017年第4期16卷 346-352页

作者： Wan Yee Lau eric CH Lai Faculty of Medicine The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina Department of Surgery Pamela Youde Nethersole Eastern HospitalHong Kong SARChina

BACKGROUND: Associating liver partition and portal vein ligation for staged hepatectomy (ALPPS) has recently been developed to induce rapid liver hypertrophy to reduce the chance of post-hepatectomy liver failure in patients with borderline or insufficient future liver remnant. ALPPS is still in an early developmental stage and its techniques have not been standardized. This study aimed to review the technical modifications of the conventional ALPPS procedure. DATA SOURCES: Studies were identified by searching MEDLINE and PubMed for articles published from January 2007 to December 2016 using the keywords 'associating liver partition and portal vein ligation for staged hepatectomy' and 'ALPPS'. Additional articles were identified by a manual search of references from key articles. RESULTS: There have been a lot of modifications of the conventional ALPPS. These are classified as: (1) modifications aiming to improve surgical results; (2) modifications aiming to expand surgical indications; (3) salvage ALPPS; (4) ALPPS using the minimally invasive approach. Some of these modifications have made the conventional ALPPS procedure to become even more complex, although there have also been other attempts to make the procedure less complex. The results of most of these modifications have been reported in small case series or case reports. We need better well-designed studies to establish the true roles of these modifications. However, it is interesting to see how this conventional ALPPS procedure has evolved since its introduction. CONCLUSIONS: There is a trend for the use of minimally invasive procedure in the phase 1 or 2 of the conventional ALPPS procedure. Some of these modifications have expanded the use of ALPPS in patients who have been considered to have unresectable liver tumors. The long-term oncological outcomes of these modifications are still unknown.

关键词： associating liver partition and portal vein ligation for stage hepatectomy hepatocellular carcinoma hepatectomy liver metastasis portal vein embolization

Taxonomy,distribution,and contemporary exposure of terrestrial mammals to floods and human pressure across different areas for biodiversity conservation in China

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2024年第3期19卷 458-467页

作者： Roman SHARNUUD eric I.AMECA MOE Key Laboratory for Biodiversity Science&Ecological Engineering College of Life SciencesBeijing Normal UniversityBeijingChina Climate Change Specialist Group Species Survival CommissionInternational Union for Conservation of NatureGlandSwitzerland

A significant research focus is placed on identifying animal species and areas at future risk to human-induced alterations of the environment and long-term changes in climatic ***,the extent to which exposure to extreme climatic events and intense human pressure can increase the risk of harmful impacts on species remains poorly *** on terrestrial mammals in China,one of the world’s megadiverse countries,we investigated patterns of contemporary exposure to floods and human pressures and determined their taxonomic representation and distribution across three major area-based conservation schemes,namely,national nature reserves(NNRs),priority areas for biodiversity conservation(PABCs),and key biodiversity areas(KBAs).Among the 440 species assessed with moderate or high exposure to floods,327(∼75%)also qualified as moderate or high in exposure to intense human *** species mainly belong to the orders Chiroptera,Eulipotyphla,and ***,there were 305,311,and 311 species with moderate or high exposure to flood and intense human pressure represented across NNRs,PABCs,and KBAs,*** findings support the prioritization of KBAs for expansion of site-based protection efforts such as NNRs in China,considering threats to species from exposure to adverse effects from both extreme climate and human pressure.

关键词： conservation floods human pressure mammals taxonomy

Upper cluster algebras and choice of ground ring

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 Mathematics 2019年第7期62卷 1257-1266页

作者： eric Bucher John Machacek Michael Shapiro Department of Mathematics Xavier University Cincinnati OH 45207 USA Department of Mathematics and Statistics York University Toronto Ontario A13J 1P3 Canada Department of Mathematics Michigan State University East Lansing MI 48824 USA

We initiate a study of the dependence of the choice of ground ring on the problem on whether a cluster algebra is equal to its upper cluster algebra. A condition for when there is equality of the cluster algebra and upper cluster algebra is given by using a variation of Muller's theory of cluster localization. An explicit example exhibiting dependence on the ground ring is provided. We also present a maximal green sequence for this example.

关键词： cluster algebras upper cluster algebras locally acyclic cluster algebras

Cabbage waxes affect Trissolcus brochymenae response to short-range synomones

在线全文

学校读者我要写书评

暂无评论

Insect Science 2013年第6期20卷 753-762页

作者： Francesca Frati Gianandrea Salerno eric Conti Dipartimento di Scienze Agrarie e Ambientali Universita di Perugia Borgo XX Giugno 74 Perugia 06121 Italy

We show that induced synomones, emitted as a consequence of Murgantia histrionica activity on Brassica oleracea, are adsorbed by the epicuticular waxes of leaves and perceived by the egg parasitoid Trissolcus brochymenae. Leaves were exposed to M. histrionica females placed on the abaxial leaf surface. After 24 h, the leaves were treated mechanically using gum arabic, or chemically using chloroform, on the adaxial surface, and finally the adaxial surface was assayed with T. brochymenae by two-choice tests in a closed arena. Wasp females responded to mechanically dewaxed cabbage leaf portions with feeding punctures and footprints （Ff） and with feeding punctures, oviposition and footprints （FOr）, showing no effect of wax removal. In contrast, the removal of the epicuticular waxes from leaf portions close to FOf, and from leaves with oviposition and footprints （Of）, determined the lack of responses by T. brochymenae. Solvent extracts of different treatments were bioassayed, but only FOr triggered parasitoid response. Thus the detection of oviposition-induced synomones by the parasitoid depends on their adsorption by the epicuticular waxes. Mechanical wax removal from leaf portions contaminated with host footprints （f） also determined a lack of wasp responses, suggesting that the footprints might trigger the induction of a ＂footprint-induced synomone＂ adsorbed onto the epicuticular waxes and exploited by the parasitoid. Leaf portions with the abaxial lamina previously dewaxed and then contaminated by footprints （D＋f） of M. histrionica did not affect the parasitoid response, indicating that the abaxial epicuticular waxes are not directly involved in the chemicals induced by M. histrionica footprints.

关键词： Brassica oleracea egg parasitoid induced synomones Murgantia histrion-ica oviposition

The glassy solid as a statistical ensemble of crystalline microstates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 1199-1204页

作者： eric B.Jones Vladan Stevanović Colorado School of Mines GoldenCO 80401USA National Renewable Energy Laboratory GoldenCO 80401USA

We present an alternative and,for the purpose of non-crystalline materials design,a more suitable description of covalent and ionic glassy solids as statistical ensembles of crystalline local minima on the potential energy *** by the concept of partially broken ergodicity,we analytically formulate the set of approximations under which the structural features of ergodic systems such as the radial distribution function(RDF)and powder X-ray diffraction(XRD)intensity can be rigorously expressed as statistical ensemble averages over different local *** is carried out by evaluating these ensemble averages for elemental Si and SiO_(2) over the local minima obtained through the first-principles random structure sampling that we performed using relatively small simulation cells,thereby restricting the sampling to a set of predominantly crystalline *** comparison with XRD and RDF from experiments(amorphous silicon)and molecular dynamics simulations(glassy SiO_(2))shows excellent agreement,thus supporting the ensemble picture of glasses and opening the door to fully predictive description without the need for experimental inputs.

关键词： ensemble crystalline glasses

Design of on-demand wireless capsule endoscope

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

仪器仪表学报 2008年第1期29卷 11-15页

作者： Yang Li eric W Able Peng Chenglin College of Bioengineering Chongqing University Chongqing 400044 China School of Engineering and Physical Sciences University of Dundee Dundee DD1 4HN UK

An on-demand wireless capsule endoscope with fulldigital and bidirectional communication is presented,aiming at fulfilling the requirements of micromation and micropower consumption of modern wireless *** proposed multifunctional operation and unique radio transmission system cuts down the power consumption efficiently and on-demand bidirectional communication in vitro improves the detection rate of ***,gray dilatation is introduced in a bit plane that optimizes the distortion rate in the process of image recording and transmission.

关键词：随机无线内窥镜全数字式双向通信灰度级扩张术设计

Remote sensing and geographic information systems techniques in studies on treeline ecotone dynamics

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2019年第5期30卷 1543-1553页

作者： Parveen K.Chhetri eric Thai Department of Earth Science and Geography California State University Dominguez Hills

We performed a meta-analysis on over 100 studies applying remote sensing(RS)and geographic information systems(GIS)to understand treeline dynamics.A literature search was performed in multiple online databases,including Web of Knowledge(Thomson Reuters),Scopus(Elsevier),BASE(Bielefeld Academic Search Engine),CAB Direct,and Google Scholar using treeline-related *** found that RS and GIS use has steadily increased in treeline studies since *** RS and satellite imaging techniques varied from low-resolution MODIS,moderate-resolution Landsat,to high-resolution WorldView and aerial *** papers published in the 1990s used low to moderate resolution sensors such as Landsat Multispectral Scanner and Thematic Mapper,or SPOT PAN(Panchromatic)and MX(Multispectral)RS ***,we observed a rise in high-resolution satellite sensors such as ALOS,GeoEye,IKONOS,and WorldView for mapping current and potential ***,we noticed a shift in emphasis of treeline studies over time:earlier reports focused on mapping treeline positions,whereas RS and GIS are now used to determine the factors that control treeline variation.

关键词： Digital elevation model Geographic information systems Remote sensing Treeline