检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

公司内部资本市场的q理论

清华金融评论 2024年第7期 97-100页

作者：戴民泽维尔·吉鲁德蒋为王能香港理工大学应用数学系和会计与金融系中国香港美国哥伦比亚大学商学院香港科技大学工学院中国香港长江商学院

多部门的企业集团在全球经济中占据重要地位。多部门的企业集团的价值并非各部门价值的简单加总。论文《公司内部资本市场的q理论》(A q Theory of Internal Capital Markets)提出了一个关于多部门企业集团的投资、分拆、融资和风险管... 详细信息

多部门的企业集团在全球经济中占据重要地位。多部门的企业集团的价值并非各部门价值的简单加总。论文《公司内部资本市场的q理论》(A q Theory of Internal Capital Markets)提出了一个关于多部门企业集团的投资、分拆、融资和风险管理的动态模型。

关键词：内部资本市场 q理论风险管理 Capital 融资多部门企业集团动态模型

Spectroscopic studies of gel-grown lanthanum malonate crystals

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2012年第3期30卷 245-249页

作者： Varghese Mathew Sabu Jacob Lizymol xavier K.E.Abraham Department of Physics St.Aloysius'CollegeEdathua-689573India Department of Physics S.B.CollegeChanganacherry-686101India

Lanthanum malonate crystals were grown by single tube ionic diffusion through silica gel. The crystallinity of the grown crystals was analyzed by powder X-ray diffraction studies. Fourier transform infrared spectroscopy （FTIR） and fourier transform （FT） Raman studies confirmed the presence of functional groups in the title compound. The optical band gap energy of the material was extracted from diffuse reflectance spectrum.

关键词： lanthanum malonate crystal growth X-ray diffraction analysis DRS studies FTIR and FT Raman studies rare earths

Effect of garlic peel on growth,hematological parameters and disease resistance against Aeromonas hydrophila in African catfish Clarias gariepinus(Bloch) fingerlings

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2010年第8期3卷 614-618页

作者： Karthik Thanikachalam Marimuthu Kasi xavier Rathinam Department of Biotechnology Faculty of Applied SciencesAIMST UniversityMalaysia

Objective:To evaluate the efficacy of dietary doses of garlic(Allium sativum L.) peel on the hematological and disease resistance of African catfish[Glorias gariepinus(***)] fingerlings against the infections caused by opportunistic bacterial pathogen Aeromonas ***:Powdered garlic peel was incorporated into the diets at(0%,0.5%,1.0% and 1.5%) and fed to catfish fingerlings for 20 *** the feeding trial,biochemical(serum total protein,albumin and globulin),hematological parameters(white blood cells and red blood cells) of the fish were *** were challenged with Aeromona hydrophila(***) after 20 days of post feeding and percentage mortalities were recorded up to 10 days after post ***:Enhanced serum protein,albumin and globulin in fish fed with all the dosages of garlic peel when compared to control *** highest red blood cell and white blood cell counts were recorded in garlic peel incorporated diet fed groups compared to control *** results also demonstrate that low survival rate(55.5±11.0)%in control groups and significantly higher survival rates were recorded in all the garlic peel fed groups after challenging with *** no significant impact was noticed with regard to body weight gain,specific growth rate and food conversion ratio of fish fed with different levels of garlic peel inclusion and control ***:These results indicate that garlic peel enhances the hematological parameters even at a low level(0.5%) incorporation and makes C. gariepinus highly immunopotent and more resistant to infection by ***.

关键词： Garlic peel Disease resistance Clarias gariepinus

Laser Measurements in High Speed Compressors for Rotor-Stator Interaction Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2003年第4期12卷 310-317,309页

作者： xavier Ottavy Isabelle Trébinjac André Vouillarmet David Arnaud Laboratoire de Mecanique des Fluides et d'Acoustique UMR CNRS 5509/ECL/UCB Lyon I Ecole Centrale de Lyon 36 Avenue Guy de Collongue 69134 ECULLY Cedex France

This paper deals with the experimental quantification of the unsteady effects of the interactions between rotor and stator rows in high speed compressors. Due to the fact that the levels of the periodic fluctuations arising from the unsteady interaction may be low compared with the random fluctuations arising from the measurement uncertainties, it is crucial to minimize the errors inherent to the used technique. The first part of the paper concentrates on technical details relative to the experimental process. The second part is devoted to the data post-processing. Two tools for analysing the rotor-stator interactions are presented. The first tool is based on a decomposition of the flow field which was initially introduced to solve numerical problems when attempting to calculate the flow field in a multi-row configuration. The second tool is based on a spectral analysis of the signal, that qualifies the interaction in a sense of circumferential spinning lobes. Experimental results obtained within both an axial and a centrifugal high speed compressors are used to illustrate the data processing. In both cases, the effects of the unsteady interaction are quantified.

关键词： laser anemometry high speed compressor rotor-stator interaction.

The effects of step inclination and air injection on the water flow in a stepped spillway:A numerical study

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2017年第2期29卷 322-331页

作者： Khadidja Kherbache xavier Chesneau Belkacem Zeghmati Stéphane Abide Saadia Benmamar Universite de Perpignan Via Domitia(UPVD) LAhoratoire the Mathematiques et de PhySique(LAMPS)EA4217F-66860PerpignanFrance Ecole Nationale Polytechnique Laboratoire de Recherche des Sciences de I'eau10 Avenue Hassen Badi16000 AlgerAlgerie

In this work, we perform a numerical study of a water flow over a stepped spillway. This flow is described by the Reynolds averaged Navier-Stokes equation （RANS） associated with the turbulence k - model. These equations are solved using a commercial software based on the finite volume scheme and an unstructured mesh. The air-water flow was modeled using volume of fluid （VOF） and multiphasic methods. The characteristics of the profile, etc.. We analyze the effects on the flow structure of the flow were investigated including the total pressure, the velocity steps and countermarch inclination, the air injection through the countermarch into the water flow and the dynamics water discharges. Results show that the inclination of the countermarch relative to the vertical and the air injection into the water flow increase the total pressure in the neighbourhood of the steps.

关键词： Stepped spillway turbulence air-water air injection volume of fluid (VOF) method multiphasic method

Carboxymethyl cellulose thiol-imprinted polymers:Synthesis, characterization and selective Hg(Ⅱ) adsorption

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第5期31卷 280-296页

作者： Tarisai Velempini Kriveshini Pillay xavier Y.MbiANDa Omotayo A.Arotiba Department of Applied Chemistry University of Johannesburg Doornfontein Campus Centre for Nanomaterials University of Johannesburg Doornfontein Campus Department of Science and Technology/National Research Foundation Centre of Excellence in Strong Materials University of the Witwatersrand

Sulfur containing ion imprinted polymers(S-IIPs) were applied for the uptake of Hg(Ⅱ) from aqueous solution. Cysteamine which was used as the ligand for Hg(Ⅱ) complexation, was grafted along the epichlorohydrin crosslinked carboxylated carboxymethyl cellulose polymer chain through an amide reaction. The adsorption ability of S-IIPs towards Hg(Ⅱ)was investigated by kinetic and isotherm models, which, corresponding, showed that the adsorption process followed a pseudo-second-order, fitted well with the Langmuir isotherm with a maximum adsorption capacity of 80 mg/g. Moreover, thermodynamic studies indicated an endothermic and spontaneous reaction with the tendency of an enhanced randomness at the surface of the S-IIPs with temperature increases. S-IIPs indicated a high degree of selectivity towards Hg(Ⅱ) in the presence of Cu^(2+), Zn^(2+), Co^(2+), Pb^(2+)and Cd^(2+).Furthermore, the efficiency of S-IIPs was also evaluated against real samples showing86.78%, 91.88%, and 99.10% recovery for Hg(Ⅱ) wastewater, ground water and tap water,respectively. In this study, the adsorbent was successfully regenerated for five cycles, which allows for their reuse without significant loss of initial adsorption capability.

关键词： Ion-imprinted polymers Carboxymethyl cellulose Adsorption Mercury(Ⅱ) Thiol

Machine perfusion strategies in liver transplantation

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2019年第5期8卷 490-501页

作者： Andrea Schlegel xavier Muller Philipp Dutkowski Liver Unit Queen Elizabeth HospitalUniversity Hospitals Birmingham NHS Foundation TrustBirminghamUK Centre for Liver and Gastrointestinal Research Institute of Immunology and ImmunotherapyCollege of Medical and Dental SciencesUniversity of BirminghamBirminghamUK Department of Surgery and Transplantation University Hospital ZurichZurichSwitzerland

Machine perfusion is a hot topic in liver transplantation and several new perfusion conceptsare currently *** to introduction into routine clinical practice,however,such perfusionapproaches need to demonstrate their impact on liver function,post-transplant complications,utilizationrates of high-risk organs,and cost ***,based on results of experimental and clinical studies,the community has to recognize the limitations of this *** this review,we summarize currentperfusion concepts and differences between protective mechanisms of ex-and in-situ perfusion ***,we discuss which graft types may benefit most from perfusion techniques,and highlight the currentunderstanding of liver viability ***,we present results from recent clinical trials involvingmachine liver perfusion,and analyze the value of different outcome parameters,currently used as endpointsfor randomized controlled trials in the field.

关键词： Machine perfusion clinical trials viability assessment

Dual role of FGF in proliferation and endoreplication of Drosophila tracheal adult progenitor cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2020年第1期12卷 32-41页

作者： Cristina de Miguel Josefa Cruz David Martin xavier Franch-Marro Institute of Evolutionary Biology(Consejo Superior de Investigaciones Cientificas-Universitat Pompeu Fabra) Passeig Maritim de la Barceloneta 3708003 BarcelonaSpain

Adult progenitor cells activation is a key event in the formation of adult *** Drosophilat formation of abdominal adult trachea depends on the specific activation of tracheal adult progenitors(tracheoblasts)at the Tr4 and Tr5 spiracular *** of these tracheoblasts generates a pool of tracheal cells that migrate toward the posterior part of the trachea by the activation of the branchless/fibroblast growth factor(Bnl/FGF)signaling to form the abdominal adult ***,we show that,in addition to migration,Bnl/FGF signaling,mediated by the transcription factor Pointed,is also required for tracheoblast *** tracheoblast activation relies on the expression of the FGF ligand bnl in their nearby ***,we show that,in the absence of the transcription factor Cut(Ct),Bnl/FGF signaling induces endoreplication of tracheoblasts partially by promoting fizzy-related ***,our results suggest a dual role of Bnl/FGF signaling in tracheoblasts,inducing both proliferation and endoreplication,depending on the presence or absence of the transcription factor Ct,respectively.

关键词： FGF trachea adult progenitors cut proliferation endoreplication Pnt Fzr

Developing spatially and thematically detailed backdated maps for land cover studies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2017年第2期10卷 175-206页

作者： Juan JoséVidal-Macua Alaitz Zabala Miquel Ninyerola xavier Pons Dep Geografia Grumets Research GroupUniversitat Autònoma de BarcelonaBellaterraCataloniaSpain Dep Biologia Animal Vegetal i EcologiaGrumets Research GroupUniversitat Autònoma de BarcelonaBellaterraCataloniaSpain

Global or regional land cover change on a decadal time scale can be studied at a high level of detail using the availability of remote sensing data such as that provided by ***,there are three main technical challenges in this ***,the generation of land cover maps without reference data is problematic(backdating).Second,it is important to maintain high accuracies in land cover change map products,requiring a reasonably rich legend within each ***,a high level of automation is necessary to aid the management of large volumes of *** paper describes a robust methodology for processing time series of satellite data over large spatial *** methodology includes a retrospective analysis used for the generation of training and test data for historical periods lacking reference *** methodology was developed in the context of research on global change in the Iberian *** this study we selected two scenes covering geographic regions that are representative of the Iberian *** each scene,we present the results of two classifications(1985-1989 and 2000-2004 quinquennia),each with a legend of 13 *** overall accuracy of over 92%was obtained for all 4 maps.

关键词： Land cover mapping Landsat statistical classifiers backdating Iberian Peninsula