检索结果-南通市图书馆

Diffusion of Chloride Ions in Soils:*** of Soil Moisture, Bulk Density and Temperature

在线全文

学校读者我要写书评

暂无评论

Pedosphere 1997年第1期7卷 65-72页

作者： XU minggang, ZHANG YIPING and liu WEINING (Department of Soil Science and Agrochemistry, Northwestern Agricultural University, Yangling, Shaanxi 712100 China) Department of Soil Science and Agrochemistry Northwestern Agricultural University Yangling Shaanxi 712100 China

Diffusion coefficients of chloride ions in four soils of different texture with varying effective moisture content and varying bulk density from 1.1 to 1.6 g cm3 under three different temperatures were determined by the diffusion-cell method using 36Cl-labelled CaCl2 solution. The results showed that activation energy decreased with water content, which indicated that the threshold for diffusion was lower at a higher soil moisture rate. Therefore, the diffusion coefficient (D) of chloride ions in soil increased consistently with soil moisture. Although a near linear increase in the diffusion coefficient with increasing soil moisture or bulk density in all the soils was observed, the increase rate in different soils was not the same. The D value increased with temperature, and with temperature increased by 10℃ in the range from 5 "C to 45℃ theD valve increased by 10%～30%, averaging about 20%.

关键词： chloride ion diffusion coefficient soil bulk density soil moisture temperature

Plasmonic lithography with 100nm overlay accuracy

在线全文

学校读者我要写书评

暂无评论

光电工程 2017年第2期44卷 209-215页

作者： minggang liu Chengwei Zhao Changtao Wang Xiangang Luo State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering Institute of Optics and ElectronicsChinese Academy of Sciences

In this paper,we demonstrate an auto accurate alignment method to align mask-substrate in the prototype of plasmonic lithography(PL),which is essential for multilayer nanostructure fabrication with high resolution,low cost,high efficiency,and high throughput,such as circuit manufacturing and other *** obtained an alignment signal with sensitivity better than 20 nm by using the Moiréfringe ***,only using the Moiréfringes cannot guarantee the alignment of the mask and the substrate because the Moiréfringe repeats itself when the mask and substrate are offset by a fixed *** eliminate the ambiguity,boxes and the crosses alignment marks are designed beside the grating marks on the substrate and the mask,respectively.A two-step alignment scheme including coarse alignment and fine alignment is explored in the auto alignment *** the stage of coarse alignment,the edge detection algorithm based on Canny operator is adopted to detect the edges image *** the process of fine alignment,Fourier transform based on Moiréfringe image is obtained to improve the alignment *** addition,experimental results of overlay indicate that PL can obtain sub-100 nm alignment accuracy over an area of 1 cm^2 using the proposed two-step alignment *** the substrate-mask mismatch compensation,better stages and precise environment control,it is expected that much higher overlay accuracy is feasible.

关键词： Moiré fringe surface plasmonic lithography alignment

Surface display of OmpC of Salmonella serovar Pullorum on Bacillus subtilis spores

在线全文

学校读者我要写书评

暂无评论

Surface display of OmpC of Salmonella serovar Pullorum on Ba...

中国畜牧兽医学会动物微生态学分会第五届第十三次全国学术研讨会

作者： Xixi Dai minggang liu Kangcheng Pan Jinlong Yang Chongqing Academy of Animal Science College of Veterinary Medicine Sichuan Agricultural University

Salmonellosis is a major public health problem throughout the ***,there is a huge need for diversified control strategies for Salmonella *** this work,we have assessed the potential use of Bacillus subtilis(***) spores for the expression of a major protective antigen of Salmonella serovar Pullorum,*** expression of OmpC on the surface of spores was determined by immunofluorescence *** immunized with recombinant spores expressing the OmpC antigen presented significant levels of OmpC-specific serum IgG and mucosal SIgA antibodies than in mice immunized with non-recombinant spores(p<0.01).In addition,oral immunization with recombinant spores was able to induced a significant level of protection in mice against lethal challenge with Salmonella serovar *** results suggest that *** spores have promising potential in the development of mucosal vaccines against Salmonella infections.

关键词： Bacillus subtilis Spores Recombinant Surface display Salmonella pullorum OmpC Mucosal vaccines

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

真实与想象之间——薛广陈的油画艺术

美术 2023年第1期 153-154页

作者：刘芳刘明刚温州理工学院

薛广陈善于用人们熟悉的平常物品进行油画创作,追求意境与情感的表达,赋予寻常之物新的意义。他的油画聚焦于真实与想象之间,用蕴藏温度和情感的作品激起观者的共鸣。

关键词：薛广陈油画超级写实主义

Plasmonic lithography wit 100 nm overlay accuracy

在线全文

学校读者我要写书评

暂无评论

光电工程 2017年第2期44卷 241-241页

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

一种基于NSCT变换的超声图像降噪新算法

仪器仪表学报 2012年第5期33卷 1005-1012页

作者：闫晟刘明刚原建平侯朝焕中国科学院声学研究所声场声信息国家重点实验室北京100190

为有效抑制超声仪器成像中固有的斑点噪声,提出了一种基于非降采样Contourlet变换(nonsubsampled Contourlettransform,NSCT)域中边缘信号系数区提取和最小均方误差(minimum mean square error,MMSE)估计的超声图像的降噪算法。根据NSC... 详细信息

为有效抑制超声仪器成像中固有的斑点噪声,提出了一种基于非降采样Contourlet变换(nonsubsampled Contourlettransform,NSCT)域中边缘信号系数区提取和最小均方误差(minimum mean square error,MMSE)估计的超声图像的降噪算法。根据NSCT变换的细节信息刻画能力和平移不变性,对其各高频子带中系数进行分类,提取出边缘信号和平缓信号系数区;对超声图像的乘性斑点噪声进行推导研究,在边缘信号系数区和平缓信号系数区,根据各自噪声项的性质分别得出满足贝叶斯最小均方误差估计的降噪滤波方程;最后,对降噪后的系数进行NSCT反变换重建得到降噪图像。仿真图像和临床超声图像的实验结果证实,该算法与传统方法相比,不但能更有效地对斑点噪声进行抑制,也更好地保留了图像的细节信息。

关键词：超声成像仪器斑点噪声非降采样Contourlet变换图像降噪

在线全文

学校读者我要写书评

暂无评论

多倍带宽存储系统的设计思想及实现

计算机工程 2005年第21期31卷 187-188页

作者：柯昌松侯朝焕刘明刚中科院声学所数字集成部北京100080

提出了一种新的存储器结构——多倍带宽存储器结构(MBM)。该结构可利用现有存储器件在不增加时钟频率的情况下,提高存储器系统的容量和速度,同时降低成本。在详细分析了SDRAM和DDR存储器结构的基础上,提出了MBM的设计思想,并给出了其实... 详细信息

提出了一种新的存储器结构——多倍带宽存储器结构(MBM)。该结构可利用现有存储器件在不增加时钟频率的情况下,提高存储器系统的容量和速度,同时降低成本。在详细分析了SDRAM和DDR存储器结构的基础上,提出了MBM的设计思想,并给出了其实现方法和实际波形。

关键词：多倍带宽存储器结构数据速率容量速度成本

Bioinformatic Analysis of codon usage bias in the ompC gene of Salmonella pullorum

在线全文

学校读者我要写书评

暂无评论

Bioinformatic Analysis of codon usage bias in the ompC gene ...

中国畜牧兽医学会动物微生态学分会第十一次全国学术研讨会暨第五届会员代表大会

作者： Xiaoyu Bao Guoyang Xu Lei Fan minggang liu Yao Zhou Kangcheng Pan Institute of Preventive Veterinary Medicine College of Veterinary Medicine of Sichuan Agricultural University Key Laboratory of Animal Disease and Human Health of Sichuan Province Sichuan Agricultural University

The aim was to identify codon usage bias between the newly comfirmed Salmonella pullorum outer membrane protein C(ompC) gene(GenBank accession ***003047) and that of other 21 reference *** we performed comparative analysis of the codon usage bias among different organisms by a series of bioinformatics softwares The apparent codon usage bias in the 22 ompC were indicated by the codon adaptation index(CAI),effective number of codons(ENc)and the value of G+C content at the 3rd codon position(GC3s).The Enc-plot revealed that these outer membrane protein C genes are subject to GC compositional *** correlation analysis with other four organisms implied that codon usage pattern of *** is similar to Salmonella pullorum OmpC.

关键词： codon usage bias ompC Salmonella pullorum

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

螺旋回热器传热性能的研究

化工学报 1987年第3期3卷 343-349页

作者：古大田刘明刚成都科技大学化工系

本文在相似理论指导下研究了螺旋回热器稳定流动状态下的传热性能.分别用液体和空气作为传热介质,在比较大的Dn和Pr变化范围内测量了传热系数.用线性回归分析法关联出了Nu与Dn和Pr之间的准数方程.同时用修正的Wilson标绘法确定传热系数... 详细信息

本文在相似理论指导下研究了螺旋回热器稳定流动状态下的传热性能.分别用液体和空气作为传热介质,在比较大的Dn和Pr变化范围内测量了传热系数.用线性回归分析法关联出了Nu与Dn和Pr之间的准数方程.同时用修正的Wilson标绘法确定传热系数,获得了与测量结果比较满意的一致的结果.

关键词：传热性能传热介质回热器传热系数传热实验