检索结果-南通市图书馆

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

有限元插值误差的下界估计

数学的实践与认识 2009年第15期39卷 159-164页

作者：陈蔚 michal Krizek 山东大学经济学院山东济南250100 捷克科学院数学研究所捷克布拉格zitna25CZ-11567

基于一维区域上的拟一致剖分,证明了线性元插值误差的最优下界估计.基于此并利用超收敛理论,我们得到了有限元离散误差的上、下界.

关键词： Lagrange有限元 Cea's引理下界估计

EFFECTS OF END-WALL SHAPING ON STEAM TURBINE EFFICIENCY

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2011年第1期28卷 23-31页

作者： Hoznedl michal Tajc Ladislav Bednar Lukas Dvorak Dalibor 斯柯达动力公司实验研究部西波黑米亚大学动力系统工程系

The end-wall shaping effects of the guide blade in the steam turbine stages are *** research of the end-wall shaping effects on turbine efficiency applies CFD numerical simulations and the measurement of straight blade cascades in the wind *** final stage of research activities includes the experimental verification of the findings in an experimental steam *** the findings are interesting in terms of efficiency,a series of 3-D numerical simulations are *** demonstrate the certain improvement when the shaping is used,especially in the blade tip *** steam turbine is used to measure the shaping effects on both sides（bilateral shaping）as well as only in the blade tip *** process indicates the efficiency improvement on the blade tip ***,this occurs only in partial *** the other hand,there is a drop in efficiency compared with blades with straight end-walls.

关键词： turbines turbine blade efficiency end-wall shaping

PCL and PCL/bioactive glass biomaterials as carriers for biologically active polyphenolic compounds: Comprehensive physicochemical and biological evaluation

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2021年第6期6卷 1811-1826页

作者： michal Dziadek Kinga Dziadek Kamila Checinska Barbara Zagrajczuk Monika Golda-Cepa Monika Brzychczy-Wloch Elzbieta Menaszek Aneta Kopec Katarzyna Cholewa-Kowalska Jagiellonian University Faculty of Chemistry2 Gronostajowa St.30-387KrakowPoland AGH University of Science and Technology Faculty of Materials Science and CeramicsDepartment of Glass Technology and Amorphous Coatings30 Mickiewicza Ave.30-059KrakowPoland University of Agriculture in Krakow Faculty of Food TechnologyDepartment of Human Nutrition and Dietetics122 Balicka St.30-149KrakowPoland Jagiellonian University Medical CollegeDepartment of Molecular Medical Microbiology18 Czysta St.31-121KrakowPoland Jagiellonian University Medical CollegeDepartment of Cytobiology9 Medyczna St.30-688KrakowPoland

In this work,polymeric and bioactive glass(BG)-modified composite films were successfully loaded with polyphenols(PPh)extracted from *** was hypothesized that PPh,alone and in combination with BGs particles,would affect physicochemical and biological properties of the ***,sol-gel-derived BG particles would serve as an agent for control the release of the polyphenolic compounds,and other important properties related to the presence of *** results showed that polyphenolic compounds significantly modified numerous material properties and also acted as biologically active *** the one hand,PPh can be considered as plasticizers for PCL,on the other hand,they can act as coupling agent in composite materials,improving their mechanical *** presence of PPh in materials improved their hydrophilicity and apatite-forming ability,and also provided antioxidant *** is important is that the aforementioned properties and kinetics of PPh release can be modulated by the use of various concentrations of PPh,and by the modification of PCL matrix with sol-gel-derived BG particles,capable of binding *** films containing the lowest concentration of PPh exhibited cytocompatibility,significantly increased alkaline phosphatase activity and the expression of bone extracellular matrix proteins(osteocalcin and osteopontin)in human normal osteoblasts,while they reduced intracellular reactive oxygen species production in ***,materials loaded with PPh showed antibiofilm properties against Gram positive and Gram negative *** results suggest that obtained materials represent potential multifunctional biomaterials for bone tissue engineering with a wide range of tunable properties.

关键词： Tissue engineering Drug delivery Antioxidant properties Plant extract

Citrine Wagtail migration on the Indo-European flyway:a first geolocator track reveals alternative migration route and endurance flights to cross ecological barriers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Avian Research 2021年第4期12卷 503-508页

作者： michal Korniluk Pawel Białomyzy Grzegorz Grygoruk Tomasz Tumiel PiotrŚwiętochowski Marcin Wereszczuk Museum and Institute of Zoology Polish Academy of SciencesWilcza 6400-679 WarsawPoland Nature Association Dubelt Juszkowy Gród 1716-050 MichałowoPoland

Most long-distance migrating passerines that breed in Europe spend their winters in Africa,with only a few species migrating eastward to spend the non-breeding period in South *** use of the Indo-European flyway is rare and has been poorly studied so ***,it is extremely interesting as within that system we are currently witnessing a recent range expansion of European breeding long distance migrants and thus the lengthening of migration *** may therefore conceal a unique migratory strategies and behaviour that can help us to understand the underlying factors and mechanisms determining the evolution of migration routes,strategies and breeding range *** on light-level geolocator we reveal a first track of the Citrine Wagtail(Motacilla citreola)migration,providing insight into the migration pattern,timing and behaviour of the species that recently has extended its migration ***,the studied individual did not retrace a recent range expansion that runs north and east from the Caspian Sea but followed a migration route running south form the Caspian sea,suggesting possible presence of an alternative species range *** overall migration distance between the breeding site in Poland and the non-breeding site in Pakistan was about 10,420 km and included two endurance movement phases(920 and 2240 km)covering 30%of the whole journey length,with an average movement speed of 574 km/*** explain this migration behaviour as an adaptation for crossing the ecological barriers imposed by arid environments.

关键词： South Asia Motacilla citreola Flyways Geolocation India Long-distance migration Migration route

Advanced Industrial Engineering in Next Generation of Manufacturing Systems

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Mechanics Engineering and Automation 2014年第4期4卷 311-317页

作者： Branislav Micieta Vladimira Bifiasovit michal Haluska Department of lndustrial Engineering Faculty of Mechanical Engineering University of Zilina Zilina 010 26 Slovak Republic

The article deals with possible approaches to the development trends in the industrial engineering in manufacturing organizations. The authors emphasize the need for integration of advanced industrial engineering in the next generation of manufacturing systems, which responds to new trends of production, innovation and advanced technology. This integration represents a sustainable development, so that humanization of work are increased, more effective use of natural and energy resources are achieved and production costs are reduced. Trends in the products manufacturing must meet both industrial engineering as well as production management. The development trends in the industrial engineering in manufacturing organizations must use methods and tools of advanced industrial engineering to achieve competitiveness. The second part of this article deals with specification of these approaches in next generation of production systems.

关键词： Advanced industrial engineering development trends manufacturing enterprise intelligent agent autonomous control.

Sequence based prediction of relative solvent accessibility using two-stage support vector regression with confidence values

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 Biomedical Science and Engineering 2008年第1期1卷 1-9页

作者： Ke Chen michal Kurgan Lukasz Kurgan Department of Electrical and Computer Engineering University of Alberta T6G 2V4 Edmonton CANADA.

Predicted relative solvent accessibility (RSA) provides useful information for prediction of binding sites and reconstruction of the 3D-structure based on a protein sequence. Recent years observed development of several RSA prediction methods including those that generate real values and those that predict discrete states (buried vs. exposed). We propose a novel method for real value prediction that aims at minimizing the prediction error when compared with six existing methods. The proposed method is based on a two-stage Support Vector Regression (SVR) predictor. The improved prediction quality is a result of the developed composite sequence representation, which includes a custom-selected subset of features from the PSI-BLAST profile, secondary structure predicted with PSI-PRED, and binary code that indicates position of a given residue with respect to sequence termini. Cross validation tests on a benchmark dataset show that our method achieves 14.3 mean absolute error and 0.68 correlation. We also propose a confidence value that is associated with each predicted RSA values. The confidence is computed based on the difference in predictions from the two-stage SVR and a second two-stage Linear Regression (LR) predictor. The confidence values can be used to indicate the quality of the output RSA predictions.

关键词： relative solvent accessibility support vector regression PSI-BLAST PSI-PRED secondary protein structure

Transient Expression of Virally Delivered Meganuclease In Planta Generates Inherited Genomic Deletions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2015年第8期8卷 1292-1294页

作者： Arik Honig Ira Marton michal Rosenthal J. Jeff Smith Michael G. Nicholson Derek Jantz Amir Zuker Alexander Vainstein Danziger Innovations Ltd. Mishmar Hashiva Village Beit Dagan 50297 Israel Precision Biosciences 302 East Pettigrew Street Dibrell Building Suite A-100 Durham NC 27701 USA Institute of Plant Sciences and Genetics in Agriculture Robert H. Smith Faculty of Agriculture Food and Environment Hebrew University of Jerusalem Rehovot 76100 Israel

Dear Editor The use of sequence-specific nucleases for plant genomic DNA mutagenesis is an exciting and rapidly developing tech- nology （Voytas and Merchant, 2013; Baltes and Voytas, 2014）. To date, most mutated plants have been recovered from transgenic plants stably expressing nucleases. However, transient nuclease delivery by plant DNA- and RNA-based viral vectors followed by regeneration of plantlets from modi- fied tissues has emerged as an alternative, efficient strategy in some plant species （Marton et al., 2010; Baltes et al., 2014）. Delivery of nucleases by plant RNA viruses is particularly attractive because they typically do not integrate into the plant genome, and therefore the mutated plants are not classified as transgenic （Marton et al., 2013; Voytas and Gao, 2014）.

关键词： CELLS

Study on Negative Impact of Harmonic Components on Sensitive Electric Equipment

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 Energy and Power Engineering 2013年第4期7卷 733-739页

作者： Miroslav Dubovsky Alena Otcenasova michal Pokorny The Central Slovak Distribution Company Inc. (SSE-Distribution a.s.) Zilina 01047 Slovakia Department of Power Electrical Systems Faculty of Electrical Engineering University of Zilina Zilina 010 26 Slovakia

Distribution systems operators are often confronted with declined power quality, which can cause substantial economical losses. The problem analyzed in paper concerns thyristor controlled direct current motor used for ski-lift in ski resort as a source of disturbances with negative impact on sensitive electric equipment, which is then unable to operate correctly. To solve mentioned problems, series of measurements of voltage quality parameters were carried out according to the respective valid standards. Crucial power quality parameters necessary for parallel power active filter design were then analyzed. Power active filter compensates power factor and filters characteristic current harmonics. After power active filter was put into operation, power quality problems were eliminated. Payback period is estimated up to four years.

关键词： Power quality higher harmonics total harmonic distortion power factor power active filter sensitive electric equipment.

Ecological Characteristics of Two Closely Related Rodent Species in Urban Environment—Permanent Inhabitant vs Newcomer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Natural Resources 2017年第2期8卷 69-80页

作者： Agnieszka Pieniazek Miloslawa Sokol michal Kozakiewicz Department of Ecology Faculty of BiologyBiological and Chemical Research CentreUniversity of WarsawWarsawPoland

The aim of the study was to characterize natural and urban populations of two Apodemus species—the striped field mouse (Apodemus agrarius) and the yellow-necked mouse (Apodemus flavicollis)—seeking to verify whether the different durations of synurbization have led populations of the two species to exhibit differing characteristics. The study was conducted in central Poland (in Warsaw and its surrounds, in urban parks in the city center and in natural habitats outside the city) over two seasons, during which a total of 1751 striped field mice and 454 yellow-necked mice were live-trapped (using the catch-mark-release method). We found altered characteristics of urban populations of striped field mice, which we interpret as the result of the relatively lengthy synurbization of the species over the last hundred years and its adaptation to the highly modified urban environment. A significantly higher percentage of sexually-active males and a higher average body mass were observed for the urban population of striped field mice, suggesting that the species is in better condition in urban habitats. We found urban populations of yellow-necked mice, in turn, to be unstable (as reflected in a high turn-over rate and a low percentage of retrapped mice), their survival in urban habitats only being made possible by ongoing attempts at colonization. We conclude that, in urban habitats, the system of competition between the two species exhibits a certain shift in favor of striped field mice—typically a weaker species, but the first to colonize cities. Overall, we conclude that the conditions present in urban habitats act as a strong factor shaping populations with characteristics different from those found in natural habitats. This is further enhanced by the priority effect, resulting from differing durations of urban habitation and adaptation, leading to changes in the system of competition between species.

关键词： Urbanization Small Mammals Urban Population Apodemus Priority Effect