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

在狭窄的边缘处实现自动化

现代制造 2022年第9期 36-37页

作者： Hans-joachim muller 不详

在涉及高电压和超高电压的地方,每一个细节都很重要。如绝缘体上的铸造毛刺,必须仔细去除--以前是手工完成。现在,特殊机械公司Potzi的一个设备将这个过程实现最大程度的自动化。SEW的驱动解决方案覆盖了广泛的应用范围。当位于班贝格的... 详细信息

在涉及高电压和超高电压的地方,每一个细节都很重要。如绝缘体上的铸造毛刺,必须仔细去除--以前是手工完成。现在,特殊机械公司Potzi的一个设备将这个过程实现最大程度的自动化。SEW的驱动解决方案覆盖了广泛的应用范围。当位于班贝格的Trench Germany公司,西门子能源公司的子公司,要移动自己生产的绝缘体时需要应用重型设备。

关键词：超高电压重型设备绝缘体子公司班贝格自动化

In Memory of joachim Messing,a Pioneer in Molecular Genetics and Genomics

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2019年第11期12卷 1419-1421页

作者： Students and Postdocs of joachim Messing 机构不祥

We grieve the passing of our beloved and respected mentor,colleague,and friend,***(Jo)Messing,a Distinguished University Professor and director of the Waksman Institute of *** made pioneering contributions that underpin the modern fields of molecular genetics and *** invented the,lshotgunn DNA sequencing method along with a set of toolkits for molecular cloning,which he sent out worldwide for free,advancing the genomic era of *** endeavors guided the directions of both fundamental and applications-based research in agriculture,biofuel,and medicine.

关键词： Pioneer passing directions

Impact of renewable energies on the operation and economicsituation of coal fired power stations： Actual situation of coalfired power stations in Germany

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2017年第2期11卷 119-125页

作者： Hans-joachim KRAUTZ Alexander LISK joachim POSSELT Christian KATZER Department for Power Plant Technology Brandenburg University of Technology Cottbus-Senftenberg 03046 Cottbus Gemany

Due to the fluctuating character of the renewable energy sources the demand of conventional power plants for flexibility is increasing. In the recent years, in Germany there has been a fast rise of production capacity of renewable energies, especially from wind turbines, photovoltaic installations, and biomass plants. The installed nominal power of wind turbines is actually (December 2016) 42 GW and of photovoltaic installations 40 GW. The renewable electric energy production in Germany is about 190 TWh/a, which represents a share of 33% of the yearly demand. The increased need for flexibility affects both the power gradients as well as the minimum load of conventional power plants. Due to this flexibility behaviour, conventional power plants are faced with problems concerning the durability of power plant components, corrosion, more maintenance effort and consequently the overall life expectancy. Another consequence of the increasing share of renewable energies is the decreasing full load operating hours, especially of coal fired and gas power plants. Along with decreasing revenues from the energy exchange market, coal fired power plants are faced with new economically challenges.

关键词： flexible load operation minimal load power gradients power plant maintenance corrosion life expectancy

Combinatorial Dyson-Schwinger equations and inductive data types

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of physics 2016年第3期11卷 179-193页

作者： joachim Kock Departament de matemhtiques Universitat Autdnoma de Barcelona Spain

The goal of this contribution is to explain the analogy between combinatorial Dyson-Schwinger equations and inductive data types to a readership of mathematical physicists. The connection relies on an interpretation of combinatorial Dyson-Schwinger equations as fixpoint equations for polynomial functors （established elsewhere by the author, and summarised here）, combined with the now-classical fact that polynomial functors provide semantics for inductive types. The paper is expository, and comprises also a brief introduction to type theory.

关键词： Dyson-Schwinger equations type theory inductive types bialgebras polynomialfunctors

A Fresh Look at Dickinsonia:Removing It from Vendobionta

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2006年第5期80卷 636-642页

作者： joachim REITNER Geowissenschaftliches Zentrum Abteilung Geobiologie Universitt Gttingen 37077 Gttingen Germany

The Ediacaran Dickinsonia is well-known for being the only fossil to be assigned to many phyla,ranging from lichens,Cnidaria,Platyhelminthes,Annelida,and a phylum of its own to a nonmetazoan kingdom.A new specimen from the Ediacaran fine-grained sandstone on the Winter Coast of the White Sea in northern Russia,which has an age of ~555 million years ago,preserved convincing internal anatomies of definite animals,comparable with meridional canals of extant ctenophores(comb jellies).Additionally,we reconsidered Dickinsonia as a biradially symmetrical animal rather than a bilateral one as previously *** animal nature of Dickinsonia is,thus,well established and its affinities are most probably allied to *** research is not only removing Dickinsonia from Vendobionta,but also bringing the fossil record of ctenophores forward to 20 million years before the Cambrian “explosion”.

关键词： Dickinsonia Ctenophora Vendobionta metazoan Ediacara biota Ediacaran

Diverged Copies of the Seed Regulatory Opaque-2 Gene by a Segmental Duplication in the Progenitor Genome of Rice, Sorghum, and Maize

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2008年第5期1卷 760-769页

作者： Jian-Hong Xu joachim Messing Waksman Institute of Microbiology Rutgers University 190 Frelinghuysen Road Piscataway NJ 08854 USA

Comparative analyses of the sequence of entire genomes have shown that gene duplications, chromosomal segmental duplications, or even whole genome duplications （WGD） have played prominent roles in the evolution of many eukaryotic species. Here, we used the ancient duplication of a well known transcription factor in maize, encoded by the Opaque-2 （O2） locus, to examine the general features of divergences of chromosomal segmental duplications in a lineagespecific manner. We took advantage of contiguous chromosomal sequence information in rice （Oryza sativa, Nipponbare）, sorghum （Sorghum bicolor, Btx623）, and maize （Zea rnays, B73） that were aligned by conserved gene order （synteny）. This analysis showed that the maize 02 locus is contained within a 1.25 million base-pair （Mb） segment on chromosome 7, which was duplicated ≈56 million years ago （mya） before the split of rice and maize 50 mya. The duplicated region on chromosome I is only half the size and contains the maize OHP gene, which does not restore the O2 mutation although it encodes a protein with the same DNA and protein binding properties in endosperm. The segmental duplication is not only found in rice, but also in sorghum, which split from maize 11.9 mya. A detailed analysis of the duplicated regions provided examples for complex rearrangements including deletions, duplications, conversions, inversions, and translocations. Furthermore, the rice and sorghum genomes appeared to be more stable than the maize genome, probably because maize underwent allotetraploidization and then diploidization.

关键词： WGD Opaque-2

Hepatitis B virus-induced oncogenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第1期13卷 74-81页

作者： joachim Lupberger Eberhard Hildt Department of Internal Medicine II Hugstetter Str. 55 D-79106 Freiburg Germany

Hepatocellular carcinoma (HCC) is one of the most com- mon cancers in the world with an annual incidence of more than 500 000 in the year 2000. Its incidence is rising in many countries. Recently, it has been estimated that about 53% of HCC cases in the world are related to hepatitis B virus (HBV). The epidemiological association of HBV with HCC is well established. In recent studies, it was revealed that HBsAg carriers have a 25-37 times increased risk of developing HCC as compared to non-infected people. At present, HBV-associated carcinogenesis can be seen as a multi-factorial process that includes both direct and indirect mechanisms that might act synergistically. The integration of HBV DNA into the host genome occurs at early steps of clonal tumor expansion. The integration has been shown in a number of cases to affect a variety of cancer- related genes and to exert insertional mutagenesis. The permanent liver inflammation, induced by the immune response, resulting in a degeneration and regeneration process confers to the accumulation of critical mutations in the host genome. In addition to this, the regulatory proteins HBx and the PreS2 activators that can be encoded by the integrate exert a tumor promoter-like function resulting in positive selection of cells producing a functional regulatory protein. Gene expression profiling and proteomic techniques may help to characterize the molecular mechanisms driving HBV-associated carcino- genesis, and thus potentially identify new strategies in diagnosis and therapy.

关键词： Hepatitis B virus Hepatocellular carcinoma Regulatory proteins Signal transduction

The changing Himalayan landscape:pine-oak forest dynamics and the supply of ecosystem services

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3期28卷 431-443页

作者： Niyati Naudiyal joachim Schmerbeck Department of Natural Resources TERI UniversityVasantKunjNew Delhi 110070India Chair of Silviculture Institute of Forest SciencesFaculty of Environment and Natural ResourcesUniversity of FreiburgTennenbacher Str.479085 FreiburgGermany

This review summarizes the current state of knowledge on pine and oak forest dynamics in the midmontane central Himalayan forest and the ecosystem services associated with these vegetation types. Forest ecosystems play a crucial role in the livelihood of the central Himalayas as well as the adjacent plains, providing a number of tangible and intangible ecosystem services, at each stage of succession. The successional sequence starts from warm temperate grasslands, followed by early successional pine forests, mid-successional pine-oak mixed forests and eventually culminating in a late successional oak community. This successional sequence is considerably influenced by disturbances like fire, grazing, and lopping, which maintain the vegetation types in their current form and can act as potential drivers of change. Fire and grazing in grasslands and pine forests inhibit the successional process by hindering the establishment of pioneer and late successional species, respectively. Potential land-cover changes with forest succession can lead to changes in ecosystem services supply. We found that the number of ecosystem services associated with these vegetation types increase from early to late successional community. Current management approaches fail to include the dynamic nature of vegetation, which is essential for maintenance of ecosystem service supply. In conclusion, the trade-offs between ES of global （biodiversity and carbon） and local importance （fuel wood and fodder） have to be examined carefully in order to have effective conservation and management plans for the region.

关键词： Disturbance Ecosystem services Himalaya Oak Pine

Forming Process of Strong Anisotropic Material Based on the Hydrodynamic Deep Drawing with Radial Pressure

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2005年第5期21卷 733-737页

作者： joachim DANCKERT Karl Brian NIELSEN Department of Production Aalborg University Fibigerstraede 16 DK-9220Aalborg DenmarkDepartment of ProductionAalborg University Fibigerstraede 16 DK-9220Aalborg Denmark

The hydrodynamic deep drawing process enables net shape or near net shape forming of complicated sheet metal parts made from difficultly forming materials, such as aluminium or high strength steels. Based on the conventional hydrodynamic deep drawing process, a new process, hydrodynamic deep drawing process, in which radial pressure is applied to the rim of the blank, is proposed. This new process has been analysed using FEM simulations and the obtained results have been compared with the experimental results. The material used in the experiments was Al-Mg-Si alloy, and in the FEM-simulations the elastic-plastic behaviour of Al-Mg-Si alloy was modelled using Barlat＇s 89 yield criteria.

关键词： Hydroforming Hydrodynamic deep draw Simulation Aluminum alloy