检索结果-南通市图书馆

Characterization of thixoforming process of 100Cr6 steel

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2010年第S3期20卷 916-920页

作者： K.P.SOLEK A.RASSILI j.C.PIERRET G.VANEETVELD AGH University of Science and Technology av.Mickiewicza 3030-059 KrakówPoland Thixo-Unit ULg PiMW(B56)University of L iègeBd de Colonster 4B-4000 LiègeBelgium

The main goal of this work is to analyze the semi-industrial process of steel *** process was carried out using industrial *** equipment consists of a heating device,industrial robots and a hydraulic *** globular microstructure ensuring thixotropic properties was obtained using the SIMA *** is one of the simplest and cheapest methods which could be easy applied in the case of steel *** this work,the hot forged rods,commercially produced from 100Cr6 steel,were *** first part of the work concerned the determination of the proper temperature range,for thixoforming of 100Cr6 ***,some heating tests were carried out in order to obtain as uniform temperature distribution as *** process was executed using inductive *** analysis of heated samples reveals globular particles surrounded by liquid *** last,the thixoforming process was carried out using closed-die forming *** filled die cavity and good microstructure of the part show that applied process parameters were properly selected.

关键词： thixoforming globular microstructure rheological properties physical modeling numerical modeling

Effect of Synthesis Method on Photoluminescence Properties of Na_2Sr_2Al_2PO_4Cl_9:Ce^(3+) Nanophosphor

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2012年第2期4卷 78-82页

作者： K.N.Shinde S.j.Dhoble K.Park N. S. Science and Arts College Department of Physics RTM Nagpur university Faculty of Nanotechnology and Advanced Materials Engineering Sejong University

We have synthesized a series of single-composition emission Na_2Sr_2Al_2PO_4Cl_9:Ce^(3+) phosphor by traditional solid state reactions and novel combustion method. Formation of compound was confirmed by X-ray diffraction analysis. The photoluminescence(PL) emission spectra were observed at 376 nm when excited around 322 nm for the various concentrations in both cases. The PL emission spectra of phosphors showed strong Ce^(3+)emission due to the 5d → 4f transition of Ce^(3+)ions. The Ce^(3+)emission intensity in Na_2Sr_2Al_2PO_4Cl_9:Ce^(3+) prepared by combustion was higher than that of solid state reactions.

关键词： Nanophosphor Luminescence Halophosphate

Microchimerism in recurrent miscarriage

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2014年第6期11卷 589-594页

作者： Hilary S Gammill Mary D Stephenson Tessa M Aydelotte j Lee Nelson Clinical Research Division Fred Hutchinson Cancer Research Center Seattle WA USA Department of Obstetrics & Gynecology University of Washington Seattle WA USA Department of Obstetrics and Gynecology University of Chicago Chicago IL USA and Department of Obstetrics and Gynecology University of Illinois at Chicago Chicago IL USA Division of Rheumatolegy University of Washington Seattle WA USA

Maternal-fetal cell exchange during pregnancy results in acquisition of microchimerism, which can durably persist in both recipients. Naturally acquired microchimerism may impact maternal-fetal interaction in pregnancy. We conducted studies to ask whether microchimerism that a woman acquired from her own mother is detectable before or during pregnancy in women with recurrent miscarriage. Fetal microchimerism was also assayed. Women with primary idiopathic recurrent miscarriage （n=23） and controls （n=31） were studied. Genotyping was conducted for probands, their mothers and the fetus, a non-shared polymorphism identified and quantitative polymerase chain reaction performed to measure microchimerismin peripheral blood mononuclear cells. Preconception comparisons were made between recurrent miscarriage subjects and controls, using logistic regression and Wilcoxon rank sum. Longitudinal microchimerism in subsequent pregnancies of recurrent miscarriage subjects was described. There was a trend toward lower preconception detection of microchimerism in recurrent miscarriage versus controls, 6% vs. 19% （1/16 vs. 6/31, P=0.2）. During pregnancy, 3111 （27%） of recurrent miscarriage subjects who went on to have a birth had detection of microchimerism from their own mother, whereas neither of two subjects who went on to miscarry had detection （0/2）. This initial data suggest that microchimerism from a woman＇s own mother, while detectable in women with recurrent miscarriage, may differ from controls and according to subsequent pregnancy outcome. Further studies are needed to determine the cell types,quantities and any potential functional role of microchimerism in recurrent miscarriage.

关键词： microchimerism pregnancy recurrent miscarriage reproduction

Shedding Light on Large-Scale Chromatin Reorganization in Arabidopsis thaliana

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 2012年第3期5卷 583-590页

作者： Martijn van Zanten Federico Tessadori Anton j.M. Peeters Paul Fransz Molecular Plant Physiology Institute of Environmental Biology Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands Department of Plant Breeding and Genetics Max Planck Institute for Plant Breeding Research Carl-von-Linne＇-weg 10 50829 Cologne Germany Cardiac Development and Genetics Group Hubrecht Institute for Developmental Biology and Stem Cell Research Uppsalalaan 8 3584 CT Utrecht The Netherlands Plant Ecophysiology Institute of Environmental Biology Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands Nuclear Organization Group Swammerdam Institute for Life Sciences University of Amsterdam Kruislaan 318 1098 SM Amsterdam The Netherlands

Plants need to respond quickly and appropriately to various types of light signals from the environment to optimize growth and development. The immediate response to shading, reduced photon flux （low light）, and changes in spectral quality involves changes in gene regulation. In the case of more persistent shade, the plant shows a dramatic change in the organization of chromatin. Both plant responses are controlled via photoreceptor signaling proteins. Re- cently, several studies have revealed similar features of chromatin reorganization in response to various abiotic and biotic signals, while others have unveiled intricate molecular networks of light signaling towards gene regulation. This opinion paper briefly describes the chromatin （de）compaction response from a light-signaling perspective to provide a link be- tween chromatin and the molecular network of photoreceptors and E3 ubiquitin ligase complexes.

关键词： light signaling chromatin compaction molecular network Arabidopsis

Comparison of the effect of hydrogen incorporation and oxygen vacancies on the properties of anatase TiO_2:electronics,optical absorption,and interaction with water

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第18期59卷 2175-2180页

作者： Hui jin Lianzhou Wang Debra j.Searles Chenghua Sun Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQld 4072Australia ARC Centre of Excellence for Functional Nanomaterials School of Chemical EngineeringThe University of QueenslandBrisbaneQld 4072Australia School of Chemistry and Molecular Biosciences The University of QueenslandBrisbaneQld 4072Australia School of Chemistry Monash UniversityMelbourneVIC 3800Australia

Hydrogenation has been recently developed as an approach to improve the visible-light response of titanium dioxide(TiO2);however,the effect of hydrogenation on the electronics and optical absorption of anatase TiO2has been widely *** this work,the electronic structures and optical properties of hydrogenated TiO2and its interaction with water have been studied using the density functional theory plus Hubbard model.A comparison of the effect of hydrogenation and introduction of oxygen vacancies(OVs)to TiO2is *** is found that both hydrogenation and OVs can promote the absorption of visible light and strengthen the adsorption of *** with OVs,hydrogen incorporation can lead to local distortion and even amorphous structures when it is heavily doped.

关键词：二氧化钛电子结构锐钛矿型相互作用光吸收氧空位 Hubbard模型可见光响应

A COMPARATIVE STUDY:DESIGN STRATEGIES FOR ENERGY-EFFICIENCY OF HIGH-RISE OFFICE BUILDINGS

在线全文

学校读者我要写书评

暂无评论

journal of Green Building 2016年第1期11卷 134-158页

作者： Babak Raji Martin j.Tenpierik Andy van den Dobbelsteen Faculty of Architecture and the Built Environment Delft University of TechnologyDelftthe Netherlands

Tall buildings are being designed and built across a wide range of cities.A poorly designed tall building can tremendously increase the building’s appetite for ***,this paper aims to determine the design strategies that help a high-rise office building to be more energy *** this purpose,a comparative study on twelve case buildings in three climate groups(temperate,sub-tropical&tropical)was *** exterior envelope,building form and orientation,service core placement,plan layout,and special design elements like atria and sky gardens were the subject of *** of different design strategies for reducing the cooling,heating,ventilation and electric lighting energy ***,lessons from these buildings’were defined for the three ***,a compari-son of building energy performance data with international benchmarks confirmed that in temperate and sub-tropical climates sustainable design strategies for high-rise buildings were performing well,as a result leading to lower energy ***,for the tropics the design of high-rise buildings needs additional consideration.

关键词： design strategies for energy efficient tall buildings building energy performance sustainability and climate type

Dynamics and mechanisms of permethrin resistance in a field population of the horn fly, Haematobia irritans irritans

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2009年第2期16卷 175-184页

作者： Andrew Y. Li Kimberly H. Lohmeyer j. Allen Miller USDA ARS Knipling-Bushland US Livestock Insects Research Laboratory 2700 Fredericksburg Road Kerrville TX 78028 USA

A study was conducted at the Pressler ranch, near Kerrville, Texas, USA between 2002 and 2006 to determine the dynamics and mechanisms of resistance to permethrin in a field population of the horn fly, Haematobia irritans irritans （L.）. Changes of resistance to pyrethroid insecticide associated with use of a pour-on formulation of cyfluthrin in 2002 and use of diazinon ear tags in subsequent years were studied using a filter paper bioassay technique and a polymerase chain reaction assay that detects two sodium channel mutations, kdr and super-kdr resistance alleles. A maximum of 294-fold resistance to permethrin was observed in the summer of 2002. A significant decrease in the resistance level was observed in spring 2003, and resistance continued to decline after animals were treated with diazinon ear tags. In response to pyrethroid treatments, the allelic kdr and super-kdr frequency increased from 56.3% to 93.8% and from 7.5% to 43.8%, respectively in 2002, and decreased significantly in 2003 when the pyrethroid insecticide was no longer used to treat animals. Females were found to have a higher allelic super-kdr frequency than males in 2002, while no difference was detected between males and females in the allelic kdr frequency. There was a significant positive correlation between frequencies of the sodium channel mutations and levels ofpermethrin resistance, suggesting that the sodium channel mutations, kdr and super-kdr, are the major mechanisms of resistance to pyrethroids in this horn fly population. Results of synergist bioassays also indicated possible contributions of two metabolic detoxification mechanisms, the mixed function oxidases （MFO） and glutathione S-trans- ferases （GST）. Compared to a horn fly infestation of an untreated herd, treatments with the pyrethroid pour-on formulation failed to control horn flies at the Pressler ranch in 2002. Sustained control of horn flies was achieved with the use of diazinon ear tags in 2003 and subsequent years.

关键词： efficacy horn fly insecticide resistance PCR permethrin pyrethroids

Novel and Simple Calorimetric Methods for Quantifying Losses in Magnetic Core and GaN Transistor in a High Frequency Boost Converter

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese journal of Electrical Engineering 2016年第2期2卷 68-75页

作者： Wenbo Wang Frans Pansier Sjoerd de Haan j.A.Ferreira DCE&S Faculty of Electrical EngineeringMathematics and Computer ScienceDelft University of TechnologyDelftThe Netherlands

In design and implementation of a boost converter,information on loss characteristics of switching devices and magnetic materials is a prerequisite,especially in high frequency *** gather such information,testing and accurate loss quantification is *** methods for measuring magnetic core loss are either only suitable for sinusoidal wave excitations or cannot separate winding loss from inductor *** addition,existing loss measurement approaches on the newly introduced GaN transistors are not *** this paper,we present a new method to distinguish winding loss from inductor loss under practical *** method utilizes a converter to generate the actual excitation waveforms and uses a calorimetric setup to quantify the *** splitting up the inductor in a converter into an air-core inductor and a magnetic-core inductor,both equipped with exactly the same winding structure,the air-core inductor loss can be used as the reference of the magnetic-core inductor winding *** this way,losses in the magnetic core can be determined in the actual operating condition of a converter in which the inductor is to be ***,a simple calorimetric approach for obtaining loss information of GaN transistors are is also *** methods require simple setup and are easy and convenient to *** methods work well in assessing different high frequency magnetic core materials and measuring losses in GaN transistors at 1MHz.

关键词： Core loss measurement practical excitation high frequency magnetic material practical excitation transistor loss measurement calorimetric method

Repurposing an old anti-fungal drug as a Hedgehog inhibitor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protein & Cell 2010年第5期1卷 417-418页

作者： Camilla Giambelli Dennis Liang Fei Huaizhi Wang David j.Robbins Molecular Oncology Program DeWitt Daughtry Family Department of SurgeryUniversity of MiamiMiamiFL 33136USA Department of Pharmacology and Toxicology Dartmouth Medical SchoolHanoverNH 03755USA Institute of Hepatopancreatobiliary Surgery of PLA Southwest HospitalThird Military Medical UniversityChongqing 400038China

It requires approximately 800 million dollars(US)and 10 years to successfully bring a drug from the laboratory bench into the clinic(DiMasi et al.,2003).Thus,the breakthrough discovery of today will not be available in the clinic for many years,and many dollars,after this initial *** potential way to speed up this drug developmental cycle is by repurposing drugs that have been previously approved for an alternate clinical *** this goal in mind,Beachy and colleagues set out to identify a drug with efficacy against tumors that were dependant on the Hedgehog(HH)signaling *** reported in the April issue of a leading cancer research journal that Itraconazole,a commonly used antifungal drug,can be turned against HH’s signaling function(Kim et al.,2010).It has been estimated that 25%of all human tumors may be HH dependent(Teglund et al,2010).

关键词： al. drugs dollar