检索结果-南通市图书馆

oN DIFFERENTIAL STRUCTURES oF PoLYNoMIAL SPACES IN CoNTRoL THEoRY

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2012年第3期21卷 372-382页

作者： Baltazar Aguirre HERNANDEZ Martn eduardo FRIAS-ARMENTA Fernando VERDUZCo Depto.de Matematicas Universidad Autonoma Metropolitana-lztapalapa.Av.Sn.Rafael Atlixco no.186.Col.Vicentinalztapalapa 09340MexicoD.F. Depto.de Matematicas Universidad de Sonora.Blvd.Luis Encinas y Rosales s/n.Col.CentroHermosilloSonoraMexico.

A valuable number of works has been published about Hurwitz and Schur polynomials in order to known better their properties. For example it is known that the sets of Hurwitz and Schur polynomials are open and no convex sets. Besides, the set of monic Schur polynomials is contractible. Now we study this set using ideas from differential topology, and we prove that the space of Schur complex polynomials with positive leading coefficient, and the space of Hurwitz complex polynomials which leading coefficient having positive real part, have structure of trivial vector bundle, and each space of （Schur complex and real, Hurwitz complex） polynomials has a differential structure diffeomorphic to some known spaces.

关键词： Schur polynomials Hurwitz complex polynomials trivial vector bundle

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2014年第3期60卷 373-380页

作者： Noelle FABRFE eduardo GARCIA-GALEA Dolors VINYoLES Department of Animal Biology Faculty of Biology University of Barcelona Avda. Diagonal 643 08028 Barcelona CataloniaSpain

Boldness is defined as the tendency of an individual to take risks when exposed to novel objects or situations. The main aim of this work was to dilucidate if boldness was related to the development of the secondary sexual traits （SSTs） in the male of the fiver blenny Salariafluviatilis, a freshwater fish which takes care of eggs. As a second objective SSTs effect on pa rental status adoption was also be explored. Wild young fish were caught in the Segre River （Ebro basin） in November 2010. Fish were kept in five aquaria in groups of eight males and eight females with artificial nests. Boldness （boldness score and hesitancy） of males （initially with little SSTs development） was tested as the time required to exit a refuge when exposed to a new environ ment. Fish were mantained in the same aquaria for several months, and males＇ SSTs development and reproductive behaviour were monitored. Boldness score was negatively associated to cephalic crest development. Hesitancy was negatively related to male length and was also influenced by the interaction between male length and cephalic crest. Parental status acquisition was positively related to the male＇s length, marginally related to anal gland development, and nonrelated to cephalic crest. These re sults suggest an intrasexual role of the crest as an informative trait of boldness （honest signal） which might not necessarily be chosen by the females. It is also discussed that correlational selection could be responsible for linking boldness and growth rate in this species. Sexual selection, in addition to having directed the evolution of secondary sexual traits, might have favored certain personality traits （e.g. boldness） associated with the achievement of a larger body length .

关键词： Animal personality Behavioural syndromes Freshwater blenny Male reproductive success Shyness

Constraining the timing of the India-Asia continental collision by the sedimentary record

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 Earth Sciences 2017年第4期60卷 603-625页

作者： HU XiuMian WANG JianGang AN Wei eduardo GARZANTI LI Juan State Key Laboratory of Mineral Deposits Research School of Earth Sciences and EngineeringNanjing University Institute of Geology and Geophysics Chinese Academy of Sciences School of Resources and Environmental Engineering Hefei University of Technology Laboratory for Provenance Studies Department of Earth and Environmental SciencesUniversita di Milano-Bicocca

Placing precise constraints on the timing of the India-Asia continental collision is essential to understand the successive geological and geomorphological evolution of the orogenic belt as well as the uplift mechanism of the Tibetan Plateau and their effects on climate,environment and *** on the extensive study of the sedimentary record on both sides of the Yarlung-Zangbo suture zone in Tibet,we review here the present state of knowledge on the timing of collision onset,discuss its possible diachroneity along strike,and reconstruct the early structural and topographic evolution of the Himalayan collided *** define continent-continent collision as the moment when the oceanic crust is completely consumed at one point where the two continental margins come into *** use two methods to constrain the timing of collision onset:(1) dating the provenance change from Indian to Asian recorded by deep-water turbidites near the suture zone,and(2) dating the age of unconformities on both sides of the suture *** first method allowed us to constrain precisely collision onset as middle Palaeocene(59±l Ma).Marine sedimentation persisted in the collisional zone for another 20-25 Ma locally in southern Tibet,and molassic-type deposition in the Indian foreland basin did not begin until another 10-15 Ma *** sedimentary evidence failed to firmly document any significant diachroneity of collision onset from the central Himalaya to the western Himalaya and Pakistan so *** on the Cenozoic stratigraphic record of the Tibetan Himalaya,four distinct stages can be identified in the early evolution of the Himalayan orogen:(1) middle Palaeocene-early Eocene earliest Eohimalayan stage(from 59 to 52 Ma):collision onset and filling of the deep-water trough along the suture zone while carbonate platform sedimentation persisted on the inner Indian margin;(2) early-middle Eocene early Eohimalayan stage(from 52 to 41 or 35 Ma):filling of intervening seaways and

关键词： India-Asia continental collision Timing of collision onset Himalayan orogeny Tibet Himalaya Sedimentary record

Chaos Suppression in a Sine Square Map through Nonlinear Coupling

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第11期28卷 45-48页

作者： eduardo L.Brugnago Paulo C.Rech Departamento de Física Universidade do Estado de Santa Catarina89223-100 JoinvilleBrazil

We study a pair of nonlinearly coupled identical chaotic sine square *** specifically,we investigate the chaos suppression associated with the variation of two ***-dimensional parameter-space regions where the chaotic dynamics of the individual chaotic sine square map is driven towards regular dynamics are ***,the dynamics of the coupled system is numerically characterized as the parameters are changed.

关键词： chaotic dynamics Chaos

Chemical Control of Chagas Disease Vectors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 1989年第1期2卷 24-29页

作者： eduardo N.ZERBA Centro

This paper presents the reasons why countries to which Chagas disease is endemic should carry out the relevant research themselves. A local technical capability for a rational improvement in the chemical control of vectors is being developed. This research includes (1) the triatomicidal activity of chemical insecticides, (2) determination of the mechanisms of action of these chemicals, (3) search for new synergists of these insecticides, (4) development of fumigation canisters which may be more widely used, and (5) development of new chemicals with a greater potential for use as triatomicides. 1989 Academic Press, Inc.

关键词： Chemical Control of Chagas Disease Vectors

Enabling data-driven anomaly detection by design in cyber-physical production systems

在线全文

学校读者我要写书评

暂无评论

Cybersecurity 2022年第3期5卷 34-51页

作者： Rui Pinto Gil Goncalves Jerker Delsing eduardo Tovar Department of Informatics Engineering Faculty of EngineeringUniversity of PortoPortoPortugal EISLAB Lulea University of TechnologyLuleaSweden Research Centre in Real-Time and Embedded Computing Systems Polytechnic of Porto-School of EngineeringPortoPortugal

Designing and developing distributed cyber-physical production systems(CPPS)is a time-consuming,complex,and error-prone *** systems are typically heterogeneous,i.e.,they consist of multiple components implemented with different languages and development *** of the main problems nowadays in CPPS implementation is enabling security mechanisms by design while reducing the complexity and increasing the system’s *** the IEC 61499 standard is an excellent approach to tackle these challenges by enabling the design,deployment,and management of CPPS in a model-based engineering *** propose a method for CPPS design based on the IEC 61499 *** method allows designers to embed a bio-inspired anomaly-based host intrusion detection system(A-HIDS)in Edge *** A-HIDS is based on the incremental Dendritic Cell Algorithm(iDCA)and can analyze oPC UA network data exchanged between the Edge devices and detect attacks that target the CPPS’Edge *** study’s findings have practical implications on the industrial security community by making novel contributions to the intrusion detection problem in CPPS considering immune-inspired solutions,and cost-effective security by design system *** to the experimental data,the proposed solution can dramatically reduce design and code complexity while improving application maintainability and successfully detecting network attacks without negatively impacting the performance of the CPPS Edge devices.

关键词： Artificial immune systems Cyber-physical production systems IEC 61499 Function blocks Industrial Internet of Things Anomaly-based host intrusion detection system Model-based engineering

Automated extraction of attributes from natural language attribute-based access control(ABAC)Policies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cybersecurity 2019年第1期2卷 38-62页

作者： Manar Alohaly Hassan Takabi eduardo Blanco Department of Computer Science and Engineering University of North TexasDentonTXUSA College of Computer and Information Sciences Princess Nourah bint Abdulrahman UniversityRiyadhSaudi Arabia

The National Institute of Standards and Technology(NIST)has identified natural language policies as the preferred expression of policy and implicitly called for an automated translation of ABAC natural language access control policy(NLACP)to a machine-readable *** study the automation process,we consider the hierarchical ABAC model as our reference model since it better reflects the requirements of real-world ***,this paper focuses on the questions of:how can we automatically infer the hierarchical structure of an ABAC model given NLACPs;and,how can we extract and define the set of authorization attributes based on the resulting *** address these questions,we propose an approach built upon recent advancements in natural language processing and machine learning *** such a solution,the lack of appropriate data often poses a ***,we decouple the primary contributions of this work into:(1)developing a practical framework to extract authorization attributes of hierarchical ABAC system from natural language artifacts,and(2)generating a set of realistic synthetic natural language access control policies(NLACPs)to evaluate the proposed *** experimental results are promising as we achieved-in average-an F1-score of 0.96 when extracting attributes values of subjects,and 0.91 when extracting the values of objects’attributes from natural language access control policies.

关键词： Attribute-based access control(ABAC)policy authoring natural language processing relation extraction clustering deep learning

Use of a post-production fractionation process improves the nutritional value of wheat distillers grains with solubles for young broiler chicks

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 Animal Science and Biotechnology 2013年第3期4卷 159-164页

作者： Philip Thacker Aman Deep eduardo Beltranena Department of Animal Science University of Saskatchewan51 Campus Drive Saskatoon SK S7N 5A8 Canada Alberta Agriculture and Rural Development 7000 113th Street Edmonton AB T6H 5T6 Canada

Background： Post-production fractionation of wheat distillers grains with solubles（DDGS） increases their crude protein content and reduces their fiber *** experiment was conducted to determine the effects of fractionation of wheat DDGS on apparent total tract digestibility（ATTD） and performance when fed to broiler chicks（0–21 d）.Methods： A total of 150,day-old,male broiler chicks（Ross-308 line;Lilydale Hatchery,Wynyard,Saskatchewan） weighing an average of 49.6 ± 0.8 g were assigned to one of five dietary treatments in a completely randomized *** control diet was based on wheat and soybean meal and contained 20% regular wheat *** experimental diets contained 5,10,15 or 20% fractionated wheat DDGS added at the expense of regular wheat ***： The ATTD of dry matter and gross energy were linearly increased（P 0.01） as the level of fractionated wheat DDGS in the diet *** retention was unaffected by level of fractionated wheat DDGS（P 0.05）.Weight gain increased linearly（P = 0.05） as the level of fractionated wheat DDGS in the diet *** intake,feed conversion and mortality were unaffected by level of fractionated wheat DDGS in the diet（P 0.05）.Conclusions： Post-production fractionation of wheat DDGS improves their nutritional value by lowering their fiber content and increasing their content of crude protein and *** changes in chemical composition supported increased weight gain of broilers fed wheat DDGS.

关键词： Broilers Digestibility Fractionation Performance Wheat distillers grains with solubles

Predictive models of drought tolerance indices based on physiological,morphological and biochemical markers for the selection of cotton(Gossypium hirsutum L.)varieties

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2022年第5期21卷 1310-1320页

作者： Yeison M QUEVEDo Liz P MoRENo eduardo BARRAGAN Colombian Corporation for Agricultural Research AGROSAVIA日Espinal 733529Colombia Faculty of Agricultural Sciences National University of ColombiaBogota D.C 111321Colombia

The use of tolerant crop varieties is a strategy that mitigates the water deficit effect in a sustainable *** generation of these varieties is more efficient when variables associated with this tolerance have been identified,since they can facilitate the breeding *** study aimed to establish the relationships between water deficit tolerance of four cotton varieties(Nevada-123,oasis-129,Guatapuri,and Festivalle)and morphological variables(monopodial branches,boll weight,root/shoot ratio,and leaf and root dry matter),physiological variables(relative water content,net photosynthesis,stomatal conductance,electron transport rate,photochemical quenching,photochemical efficiency of PSII,chlorophyll a/b ratio(Chl a/b),C^(12)/C^(13)isotope ratio,and electrolyte leakage),and biochemical variables(contents of sugars,proline,carotenoids,and malondialdehyde).Furthermore,calibrated predictive models of the drought tolerance indices were developed based on the key variables *** this purpose,a pot experiment was established where plants were subjected to a moderate or severe water deficit during the blooming stage for 12 *** stress tolerance index(STI)and mean productivity(MP)were *** the evaluated variables,the differences between well-watered and water deficit plants(Δ)were calculated and ANoVA,partial least squares,Pearson’s correlation,and multiple linear regression analyzes were performed.A model was generated that explained 95% of the STI and was composed of Δmalondialdehyde,Δproline,and Δboll *** MP,the model was comprised of Δstomatal conductance,Δroot/shoot ratio,and ΔChl a/b,and explained 89% of the *** analysis of the assessed variables allowed the identification of key variables and the development of calibrated predictive models that can be used in screening to obtain cotton varieties with different levels of water deficit tolerance.

关键词： drought tolerance tolerance index proline chlorophyll stomatal conductance malondialdehyde yield multivariate analysis