检索结果-南通市图书馆

Kolmogorov-Chaitin Complexity of.Digital Controller Implementations

在线全文

学校读者我要写书评

暂无评论

International Journal of.Automation and computing 2006年第3期3卷 314-322页

作者： james f. whidborne John McKernan Da-Wei Gu Department of.Aerospace Sciences Cranfield University Bedfordshire MK43 0AL UK Department of.Engineering University of Leicester Leicester LE1 7RH UK

The complexity of.linear, f.xed-point arithmetic digital controllers is investigated f.om a Kolmogorov-Chaitin perspective. Based on the idea of.Kolmogorov-Chaitin complexity, practical measures of.complexity are developed f.r statespace realizations, parallel and cascade realizations, and f.r a newly proposed generalized implicit state-space realization. The complexity of.solutions to a restricted complexity controller benchmark problem is investigated using this measure. The results show that f.om a Kolmogorov-Chaitin viewpoint, higher-order controllers with a shorter word-length may have lower complexity and better perf.rmance, than lower-order controllers with longer word-length.

关键词： Controller complexity f.nite-precision arithmetic f.nite word length digital controller Kolmogorov-Chaitin complexity.

Phylogenetic reconstruction of.Chirita and allies (Gesneriaceae) with taxonomic treatments

在线全文

学校读者我要写书评

暂无评论

Journal of.Systematics and Evolution 2011年第1期49卷 50-64页

作者： james f. SMITH Department of.Biological Sciences Boise State University

Chirita D. Don, a large genus in the subf.mily Cyrtandroideae of.Gesneriaceae, has been the subject of.much debate whether it is a natural group or not. In addition, the highly heterogeneous Chirita has also been very problematic with regard to delimitation and subdivision. Here we used the nrDNA internal transcribed spacer and cpDNA trnL-f.f.r molecular phylogenetic analaysis, combined with morphological data. Our results suggest that Chirita is an artif.cial, polyphyletic genus. The most important character that def.nes Chirita, the dorso-ventrally oblique and bilamellar stigma, has evolved convergently in dif.erent clades of.diandrous Cyrtandroideae. Chirita sensu stricto only includes the species of.Chirita sect. Chirita, whereas Chirita sect. Microchirita is an independent clade located at the basal node of.the phylogenetic tree. Chirita sect. Liebigia is closely related to Didymocarpus with an entire stigma unlike other species of.Chirita. The species of.Chirita sect. Gibbosaccus, Chiritopsis, Primulina, and Wentsaiboea f.rm a monophyletic group that is sister to a strongly supported clade comprising f.ur monotypic genera Paralagarosolen, Calcareoboea, Petrocodon, and Tengia. We f.rther analyzed the morphological evolution of.Chirita and identif.ed a series of.morphological synapomorphies f.r the monophyletic groups revealed herein, and thereby provide a taxonomic treatment in this study.

关键词： Chirita D. Don morphological evolution phylogenetic reconstruction polyphyly taxonomic treatment.

Guided Explorations of.the Mechanics of.Solids and Structures (Cambridge Aerospace Series)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Counting and Randomly Generating <i>k</i>-Ary Trees

1000年

作者： james f. Doyle

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Applied Mathematics 2021年第12期12卷 1210-1215页

作者： james f. Korsh Computer and Inf.rmation Science Department Temple University Philadelphia USA

k-ary trees are one of.the most basic data structures in Computer Science. A new method is presented to determine how many there are with n nodes. This method gives additional insight into their structure and provides... 详细信息

关键词： Combinatorial Problems k-Ary Trees Random Generation

Interaction f.rces between sof. magnetic particles in unif.rm and non-unif.rm magnetic f.elds

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 Mechanica Sinica 2010年第6期26卷 921-929页

作者： Ayyoub Mehdizadeh james f.Klausner Nima Rahmatian Department of.Mechanical and Aerospace Engineering University of FloridaP.O.Box 116300GainesvilleFL 32611-6300USA

The inf.uence of.the magnetization of.a sof. magnetic sphere on the surrounding magnetic f.eld is measured and *** interaction f.rce between two sof. magnetic particles is directly measured using an ultra precision load sensor in unif.rm and non-unif.rm magnetic f.elds. The interaction f.rce largely f.llows an inverse f.urth power law as a f.nction of.separation distance between particle centers. At small distances,the ef.ect of.magnetization of.one particle on the magnetization of.its adjacent particle causes the attractive（repulsive） f.rce to be larger（smaller） than that predicted by the inverse f.urth power *** theoretical prediction based on a modif.ed dipole model,that takes into account the coupling ef.ect of.the magnetization among sof. magnetic particles,gives excellent agreement with the measured f.rce in a unif.rm magnetic *** interaction f.rce under a non-unif.rm applied magnetic f.eld can be reasonably predicted using the dipole-dipole interaction model when the local magnetic f.eld is used to determine the magnetization.

关键词： Magnetic f.rce Magnetic charge model Magnetic dipole model Sof. magnetic particle

An international physical activity and public health research agenda to inf.rm coronavirus disease-2019 policies and practices

在线全文

学校读者我要写书评

暂无评论

Journal of.Sport and Health Science 2020年第4期9卷 328-334页

作者： james f.Sallis Deepti Adlakha Adewale Oyeyemi Deborah Salvo Department of.f.mily and Preventive Medicine University of California San DiegoLa JollaCA 92093USA Mary Mackillop Institute f.r Health Research Australian Catholic UniversityMelbourne 3000Australia School of.Natural and Built Environment Queen’s University BelfastBelfast BT95AGUK Department of.Physiotherapy College of Medical SciencesUniversity of MaiduguriMaiduguri 600243Nigeria Prevention Research Center Brown SchoolWashington University in St.LouisSt.LouisMO 63130USA

Physical activity(PA)has strong relevance f.r limiting the harms to human health and well-being due to the coronavirus disease-2019(COVID-19)pandemic.1 Active muscles produce chemicals that improve immune f.nctioning,which in turn reduces the extent of.inf.ctions,and decreases inf.ammation,and these are the main causes of.the lung damage f.om severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)*** is a powerf.l preventive and therapeutic intervention f.r the most common pre-existing chronic conditions that increase risk of.severe COVID-19 inf.ctions and mortality.

关键词： inf.ammation mortality lung

Expanding the donor pool: Hepatitis C, hepatitis B and human immunodef.ciency virus-positive donors in liver transplantation

在线全文

学校读者我要写书评

暂无评论

World Journal of.Gastroenterology 2019年第47期25卷 6799-6812页

作者： james f.Crismale Jawad Ahmad Division of.Liver Diseases Icahn School of Medicine at Mount Sinai

Liver transplantation(LT)remains the best option f.r patients with end-stage liver disease but the demand f.r organs f.om deceased donors continues to outweigh the available *** advent of.highly ef.ective anti-viral treatments has reduced the number of.patients undergoing LT f.r hepatitis C(HCV)and hepatitis B(HBV)related liver disease and yet the number of.patients waiting f.r LT continues to increase,driven by an increase in the patients listed with a diagnosis of.cirrhosis due to non-alcoholic steatohepatitis and alcoholrelated liver *** addition,human immunodef.ciency virus(HIV)inf.ction,which was previously a contra-indication f.r LT,is no longer a f.tal disease due to the ef.ectiveness of.HIV therapy and patients with HIV and liver disease are now developing indications f.r *** rising demand f.r LT is projected to increase f.rther in the f.ture,thus driving the need to investigate potential means of.expanding the pool of.potential *** mechanism f.r doing so is utilizing organs f.om donors that previously would have been discarded or used only in exceptional circumstances such as HCV-positive,HBV-positive,and HIVpositive *** advent of.highly ef.ective anti-viral therapy has meant that these organs can now be used with excellent outcomes in HCV,HBV or HIV inf.cted recipients and in some cases uninf.cted recipients.

关键词： Hepatitis C Hepatitis B Human immunodef.ciency virus Liver transplantation

Understanding China＇s Rise： The Collective Action Dimension

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

f.dan Journal of.the Humanities and Social Sciences 2016年第1期9卷 177-182页

作者： james f. Paradise EastAsia International College Yonsei University Wonju Republic of Korea

With China having a f.rtune in f.reign exchange reserves and one of.the mightiest economies in the world, people are wondering what kind of.country China will be in the international arena. Will it be a leader or a f.llower, a norm-maker or a normtaker, a team player or a rogue elephant, a status quo power or a revisionist？a Or will it f.ll somewhere between these extremes, carving out a position that is uniquely Chinese？

关键词：外汇储备中国国际地位国际市场

Ef.ects of.anthropogenic disturbances on natural regeneration and population structure of.gum arabic tree (Acacia senegal)in the woodlands of.Lake Baringo ecosystem, Kenya

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.f.restry Research 2017年第4期28卷 775-785页

作者： Stephen f. Omondi David W. Odee George O. Ongamo james I. Kanya Damase P. Khasa Kenya f.restry Research Institute P.O. Box 2041200200 NairobiKenya School of.Biological Sciences University of NairobiP. O. Box 30197-00100NairobiKenya Centre f.r f.rest Research and Institute f.r Systems andIntegrative Biology Universite′ LavalSainte-FoyQC G1V 0A6Canada

Despite the ecological and economic importance of.Acacia senegal, little is known about the ef.ects of.anthropogenic disturbances on its natural regeneration patterns and population structure. We investigated the ef.ects of.these f.ctors within the Lake Baringo woodland ecosystem. Data was collected f.om 60 plots of.20 m × 20 m systematically distributed in f.ur A. senegal-dominated populations within the Lake Baringo woodland. Sample populations spanned a degradation gradient measured by a population disturbance index (PDI). Trees were measured f.r diameter at breast height (DBH) and categorized by growth stages: seedling, sapling and adult tree. Higher seedling and sapling densities were recorded in lightly than heavily disturbed populations, but only sapling density was signif.cantly dif.erent between the two disturbance levels (P = 0.02). Lightly disturbed populations revealed a reversed J-shape size-class distribution (SCD) indicative of.stable structure unlike the heavily disturbed populations. The quotient and permutation indices indicated unstable populations with episodic recruitment and mortality. Our study reveals that natural regeneration and population structure of.A. senegal were af.ected majorly by selective harvesting and heavy browsing. Suitable management strategies to control livestock grazing and illegal tree harvesting within the woodland is required to promote conservation of.the species genetic resources

关键词： Anthropogenic disturbance Population dynamics Renewal rate Selective harvesting Tropical woodland