检索结果-南通市图书馆

Measurement of liver volume and its clinical significance in cirrhotic portal hypertensive patients

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 1999年第6期5卷 525-526页

作者： Zhu JY Leng XS Dong n Qi gy Du RY Beijing Med Univ Peoples Hosp Dept Surg Beijing 100044 Peoples R China

InTRODUCTIOnAccurate assessment of hepatic reserve function in cirrhotic portal hypertensive patients is important for selection of surgical procedure and evaluation of prognosis. The measurement of liver volume has been applied in clinic as widely as Child's class[1,2]. Limited by technical condition, measurement of liver volume in vivo has seldom been reported in China. Using double helix-spiral CT (Elscint CT Twin), the liver volume of 25 cirrhotic patients and 30 patients in controls was assessed, and a correlation analysis was made between the liver volume and preoperative natural shunting rate, portal vein flow, portal pressure and prognosis of cirrhotic patients.

关键词： liver volume hypertension, portal liver cirrhosis prognosis

Evolutionary history and phylogeography of Scots pine (Pinus sylvestris L.) in Europe based on molecular markers

维普期刊数据库评论

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 Forestry Research 2017年第4期28卷 637-651页

作者： Endre gy. To′th Zolta′n A. Kobolkuti Andrzej Pedryc Ma′ria Hohn Department of Botany Szent Istva′n University Me′nesi u′t 44Budapest 1118 Hungary Department of Genetics and Plant Breeding Szent Istva′n UniversityMe′nesi u′t 44Budapest 1118Hungary

In this review we summarized recent historical records and molecular studies on evolutionary history and phylogeography of Scots pine with focus on the European highly fragmented distribution area of the species. Fossilized pollen, plant micro- and macrofossil records provided evidences on the large-scale species’ range shifts and demographic changes during the Quaternary. Populations of Scots pine were documented both in the glacial (incl. full glaciation) and interglacial periods. Recolonization of Europe after the glaciation originated from the (Sub) Mediterranean areas like the Balkan Peninsula but also from around the Eastern Alps and the surroundings of the Danube plain. Fennoscandia and northern European Baltic regions were most probably colonized from two main directions, from Western Europe and from the Russian Plain. Modern history of Scots pine was hardly affected by anthropogenic activities that started to strengthen in the Bronze and Iron Age. Along with the fossil records, molecular genetic tools were used to infer the origin and putative history including migration, differen.iation and demography of the species. In this paper we compiled the major publications (30) of molecular genetic studies of the past 20 years derived from distinctly inherited organelle genomes (mitochondrial, chloroplast, nuclear) revealed by differen. marker systems (mtDnA-cox1, -nad1, -nad3, -nad7, ISSR, cpSSR, nSSR, B-SAP, SnP). It is important to consider that differen. phylogeographic patterns can be drawn by the analysis of differen. DnA marker types. Accordingly the use of more than one marker simultaneously outlines the most sophisticated phylogeographical pattern on the genetic lineages and can reveal high differen.iation of the European distribution. Combined marker systems and markers derived from coding sequences have also been used to detect species’ phylogeographic patterns, but these were rarely applied to Scots pine. Although new molecular techniques can provide h

关键词： Molecular genetic markers Phylogeography Pinus sylvestris Quaternary history Refugia

Almost Everywhere Convergence of Sequences of Cesàro and Riesz Means of Integrable Functions with Respect to the Multidimensional Walsh System

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第2期30卷 311-322页

作者： gyrgy GT Institute of Mathematics and Computer Science College of Nyíregyhza

The aim of this paper is to prove the *** of sequences of the Cesaro and Riesz means of the Walsh–Fourier series of d variable integrable *** is,let a=（a1,...,ad）：n→nd（d∈P）such that aj（n＋1）≥δsupk≤n aj（k）（j=1,...,d,n∈n）for someδ〉0 and a1（＋∞）=···=ad（＋∞）=＋∞.Then,for each integrable function f∈L1（Id）,we have the *** for the Cesaro means limn→∞σαa（n）f=f and for the Riesz means limn→∞σα,γa（n）f=f for any 0〈αj≤1≤γj（j=1,...,d）.A straightforward consequence of our result is the so-called cone restricted *** of the multidimensional Cesaro and Riesz means of integrable functions,which was proved earlier by Weisz.

关键词： Walsh system d-dimensional Fejer and Riesz means subsequence almost everywhereconvergence

Almost Everywhere Convergence of Fejér Means of L^1 Functions on Rarely Unbounded Vilenkin Groups

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第12期23卷 2269-2294页

作者： gyrgy GT College of nyíregyháza Institute of Mathematics and Computer Science

A highly celebrated problem in dyadic harmonic analysis is the pointwise convergence of the Fejér （or （C, 1）） means of functions on unbounded Vilenkin groups. There are several papers of the author of this paper concerning this. That is, we know the a.e. convergence σnf → f （n → ∞） for functions f ∈ L^p, where p 〉 1 （Journal of Approximation Theory, 101（1）, 1-36, （1999）） and also the a.e. convergence σMnf → f （n → ∞） for functions f ∈ L^1 （Journal of Approximation Theory, 124（1）, 25-43, （2003））. The aim of this paper is to prove the a.e. relation limn→∞ σnf = f for each integrable function f on any rarely unbounded Vilenkin group. The concept of the rarely unbounded Vilenkin group is discussed in the paper. Basically, it means that the generating sequence m may be an unbounded one, but its ＂big elements＂ are not ＂too dense＂.

关键词： rarely unbounded Vilenkin groups Vilenkin series Fejér means a.e. convergence

On the Divergence of n(?)rlund Logarithmic Means of Walsh-Fourier Series

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2009年第6期25卷 903-916页

作者： gyrgy GAT Ushangi GOGInAVA Institute of Mathematics and Computer Science College of Nyíregyháza Department of Mechanics and Mathematics Tbilisi State University

It is well known in the literature that the logarithmic means 1/logn ^n-1∑k=1 Sk（f）/k of Walsh or trigonometric Fourier series converge a.e. to the function for each integrable function on the unit interval. This is not the case if we take the partial sums. In this paper we prove that the behavior of the so-called nSrlund logarithmic means 1/logn ^n-1∑k=1 Sk（f）/n-k is closer to the properties of partial sums in this point of view.

关键词： Walsh function norlund logarithmic means a.e. divergence.

How Can China Become A World Leader in Electric Vehicle Promotion:A Case Study of BYD

在线全文

学校读者我要写书评

暂无评论

How Can China Become A World Leader in Electric Vehicle Prom...

作者： Emil István.gy（?）rfi 上海交通大学

学位级别：硕士

Currently,there is a growing trend of "green awareness" which is increasingly prevalent all around the *** increasing number of countries prepare the way to an absolute switch to electric transport by limiting or entirely banning the sale of conventional internal combustion engine ***,a country facing severe pollution problems partly caused by a growing fleet of passenger vehicles,also started to actively promote electric *** to this,the market for electric vehicles was negligible in the *** the country’s move to actively promote electric vehicles with incentives,was *** led to an explosive growth in sales of EVs,but there is a fear that these sales are only fueled by the subsidies which reduce the prices to a competitive level for *** the reduction of the subsidies might lead to consumers abandoning these vehicles well before their prices fall to,or below the level of conventional *** three research questions of this research are the following: What are China’s motivation in promoting the adoption and manufacturing of Electric Vehicles?What is China’s strategy achieve its targets? The hypothesis of this thesis is that,China promotes the EV industry,because it is a field in which no country has a definitive advantage over others,thus it is easier to catch-up and to *** order to catch-up,China pursues mercantilist policies,such as supporting domestic（and stateowned）companies with subsidies to make them more competitive against their *** global implications of this policies might include technological advantage or even a monopoly in battery *** order to prove prove the validity of these answers,a case study of BYD company,one of China’s leading companies in electric vehicle production,was conducted through means of analyzing primary and secondary documents,with a follow-up questionnaire aimed Chinese consumers to measure the impact of subsidies on their choice of buying an electr

关键词：

Convergence in L^p-norm of Fourier Series on the Complete Product of Quaternion Groups with Bounded Orders

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第9期30卷 1566-1578页

作者： gyrgy GAT Rodolfo TOLEDO College of nyiregyhza Inst.of Math.and Comp.Sci.Nyiregyhza

A well-known result for Vilenkin systems is the fact that for all 1 〈 p 〈 oc the n-th partial sums of Fourier series of all functions in the space Lp converge to the function in LP-norm. This statement can not be generalized to any representative product system on the complete product of finite non-abelian groups, but even then it is true for the complete product of quaternion groups with bounded orders and monomial representative product system ordered in a specific way.

关键词： Fourier analysis Walsh-Paley system representative product systems complete product of quaternion groups convergence in norm

A comparison between previous and present histologic assessments of chronic hepatitis C viral infections in humans

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 1999年第2期5卷 19-22页

作者： n Assy 1 and gy Minuk 2

AIM To compare the previously employed classification of liver histology (minimal, chronic persistent hepatitis, chronic active hepatitis and cirrhosis) with a new classification recently described by Sheuer et al (activity grade and fibrosis stage) in percutaneous liver biopsies from patients with chronic hepatitis C viral *** Liver biopsies from 79 untreated patients were reviewed. Anti-HCV testing had been performed by ELISA and confirmed by a recombinant immunoblot assay. With respect to the new classification, all the specimens were evaluated using the Knodell score for *** A good correlation was revealed between the previous and more recent histologic classifications in patients with abnormal liver enzyme tests. However, in 13/ 15 (87%) of patients with normal aminotransferase values, changes were consistent with chronic persistent hepatitis whereas normal activity and no fibrosis were demonstrated by the Sheuer *** The old classification is more often misleading but correlates well with the new classification and thereby permits comparisons between historically clinical studies.

关键词： hepatitis C/pathology hepatitis/pathology liver/pathology hepatitis/chronic active

Pointwise Convergence of Cone-like Restricted Two-dimensional Fejér Means of Walsh-Fourier Series

维普期刊数据库评论

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 2010年第12期26卷 2295-2304页

作者： gyrgy GT Kroly n.gy Institute of Mathematics and Computer Sciences College of Nyíregyhza

For the two-dimensional Walsh system, Gat and Weisz proved the a.e. convergence of Fejer means σnf of integrable functions, where the set of indices is inside a positive cone around the identical function, that is, β^-1≤n1/n2 ≤β is provided with some fixed parameter ~ 〉 1. In this paper we generalize the result of Gat and Weisz. We not only generalize this theorem, but give a necessary and sufficient condition for cone-like sets in order to preserve this convergence property.

关键词： Walsh group Walsh system pointwise convergence Fejer means