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OALib Journal期刊

ISSN: 2333-9721

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基于无线充电的无线传感网leach算法改进

武汉理工大学学报 , 2010,
Abstract: ?通过对leach算法的缺陷分析,加入了新权值对其进行了改进设计,说明了新算法的工作原理,并应用matlab对网络的生存时间及工作簇头分布进行了仿真验证。结果表明,新的算法考虑了无线充电设备对于无线网络路由算法的影响,对原有算法做出了合理改进。
A simple, rapid and high-resolution banding method in polyacryla-mide gels
一种简单快速高分辨率的PAGE胶显带方法

ZHANG Yu-Shan,BAI Xu-Feng,<br>张玉山,
遗传 , 2008,
Abstract: Although high-resolution picture can be obtained using the conventional banding method of DNA in PAGE gel, this method has complicated steps and will take very long time. In this paper, we reported an improved banding method of DNA in PAGE gel. DNA development in PAGE gel and comparison were performed by using two methods, the conventional banding method and the improved banding method, respectively. And the results indicated that the improved method has higher contrast between DNA band and the background in PAGE gel. So this improved method has higher resolution than the conventional one. Compared with the conventional banding method, this improved method has fewer steps, less time took and fewer reagents used. This improved method has replaced the conventional banding method completely in our laboratory.
Differential compressive correlated imaging
基于压缩感知的差分关联成像方案研究

Bai Xu,Li Yong-Qiang,Zhao Sheng-Mei,<br>,李永强,赵生妹
物理学报 , 2013,
Abstract: Correlated imaging offers great potentiality, with respect to standard imaging, to obtain the imaging of objects located in optically harsh or noisy environment. It can solve the problems which are difficult to solve by conventional imaging techniques. Recently, it has become one of the hot topics in quantum optics. In this paper, we propose a new scheme of correlated imaging with differential correlated imaging based on compressive sensing, named differential compressive correlated imaging. The new scheme takes advantage of the high signal-to-noise ratio of the differential correlated imaging and low-imaging sampling frequency of the compressed sensing technique. In the scheme, we utilize the intensity of the thermal light, which is in line with the Gaussian distribution, as the measurement matrix of compressive sensing. We extract the differential object information as the image object information which could be recovered via orthogonal matching pursuit algorithm with high quality. By numerical simulations, we verify the proposed scheme. Here, we select the two gray-scale images, such as double-slit and NUPT, as well as the two multi-grayscale images (Lena and Boats) as the object. We take sampling 350 times in differential compressive correlated imaging for measurement. The numerical simulation results show that for the above image objects, the average mean-square error (MSE) over 10 times for the differential compressive correlated imaging scheme is reduced by 97.7%, 93.9%, 92.5% and 71.4% respectively with respect to that of the differential correlated imaging scheme. Moreover, compared with the compressive ghost imaging, the MSE value of the same double-slit in CDGI, as well as Lena and Boats under the same conditions, is reduced by 50.4%, 72.9% and 66.8% separately, which indicates that the compressive differential correlated imaging scheme can greatly improve the signal-to-noise ratio of the imaging, and significantly reduce the imaging time.
Consecutive very-high-gravity batch ethanol fermentation with self-flocculation yeast
自絮凝酵母高浓度重复批次乙醇发酵

Fan Li,Xumeng Ge,Ning Li,Fengwu Bai,<br>李凡,,李宁,凤武
生物工程学报 , 2009,
Abstract: In order to save energy consumption for the downstream processes, consecutive very-high-gravity batch fermentation was developed for ethanol production with the self-flocculating yeast Saccharomyces cerevisiae flo. The fermentation system exhibited a high ethanol productivity of 8.2 g/(L·h) with average ethanol concentration around 120 g/L. However, deterioration of the sedimentation performance of yeast flocs was observed as the consecutive fermentation process was prolonged, which significantly extended the time required for yeast flocs to separate from fermentation broth, and exaggerated the inhibition of high ethanol concentration on the yeast flocs, making them quickly lost viability and the fermentation system interrupted after 11 consecutive batches. Experimental results illustrated that decrease of the size of yeast flocs was the main reason, which could be prevented by stimulating the propagation of the yeast flocs. Thus, yeast was purged from the fermentation system at the end of each batch, and the concentration of yeast flocs within the fermentor was maintained at a relatively low level to stimulate their propagation. Although the ethanol productivity was decreased to 4.0 g/(L·h), the size of yeast flocs was stabilized after 10 consecutive batches and maintained for another 14 batches without further decrease, indicating the fermentation system could be operated reliably.
Advances in Studies of Genome-Specific Repetitive DNA Sequences in Wheat and Related Species
小麦及其近缘种中基因组特异性DNA重复序列的研究进展

BAI Jian-rong,JIA Xu,WANG Dao-wen,<br>建荣,,王道文
遗传 , 2002,
Abstract: In this paper we review recent advances in studies of several aspects of genome specific repetitive DNA sequences in wheat and related species. The available results demonstrate that genome specific repetitive DNA sequences are important components of genome specificity in wheat and related species. Research on genome specific repetitive DNA sequences is essential to the elucidation of genome function. The application of genome specific repetitive DNA sequences will aid molecular cytogenetic studies in wheat and related species and contributes to genetic improvement of common wheat.
The Fluctuation Characteristics of Natural Populus euphratica Community under Water-overflowing Disturbance
漫溢补水干扰后的天然胡杨群落波动特征

CHEN Yan-rui,YIN Lin-ke,BAI Xu,<br>陈艳瑞,尹林克,
中国沙漠 , 2009,
Abstract: 以塔里木河下游荒漠河岸林中的胡杨群落为研究对象,以群落结构特征、物种多样性和优势种为群落波动的表征值,采用固定样地法对漫溢补水干扰下胡杨群落的波动响应特点进行了研究。结果表明:①干扰后胡杨群落物种组成变化明显,群落中物种数和层次呈现增加趋势,群落结构由简单向复杂转化,群落趋于稳定;②干扰前后胡杨群落物种多样性指数波动性较大,群落物种丰富度和多样性都呈增加趋势,而物种分布均匀度略有下降趋势;③漫溢补水干扰下群落中优势种的数量及种类发生改变,其中胡杨的优势度明显增大了。综上可知,地表漫溢补水植被修复措施使流域内的胡杨群落结构趋于复杂、群落层次增加,群落多样性增加,优势种及其优势度增加,总体上胡杨群落的波动为正向波动。
Properties of Quasi-Two-Dimensional Strong-CouplingMagnetopolarons in Magnetic Fields
磁场中准二维强耦合磁极化子的性质

Eerdunchaolu,Wuyunqimuge,Xu Qiu,Bai Xufang,<br>额尔敦朝鲁,乌云其木格,徐秋,
半导体学报 , 2006,
Abstract: The ground state of a magnetopolaron that is weakly coupled with bulk longitudinal optical phonons and strongly coupled with interface optical phonons,in an infinite quantum well within magnetic fields is studied using the linear-combination operator and a modified LLP variational method.Rules for how the vibration frequency and self-trapping energy of the magnetopolaron change with the width of the quantum well and the magnetic fields are obtained.Our numerical results for a CdF2/AgCl QW show that the vibration frequency and the self-trapping energy of the magnetopolaron decrease with increasing well width and increase with increasing magnetic fields strength,but the contribution of interaction between the different branches of phonons and the electron and the magnetic fields to the vibration frequency and the self-trapping energy of the magnetopolaron are greatly different.The above-mentioned phenomena are also analyzed.
Ecological carrying capacity assessment of large-scale open coal mines in loess zones- A case study of Antaibao Opencast Mine in Pingshuo
黄土区大型露天煤矿区生态承载力评价研究--以平朔安太堡露天煤矿为例

CUI Xu,GE Yuan-Ying,BAI Zhong-Ke,<br>崔 ,葛元英,中科
中国生态农业学报 , 2010,
Abstract: Change in Ecological Carrying Capacity (ECC) in open coal mines is closely related with pollution control, land reclamation and ecology rehabilitation measures. Based on connotation and hierarchical characteristics of ecological carrying capabilities of mines (MAECC), a quantified assessment method of MAECC involving ecosystem resilience, resource and environment carrying capacity, and ecosystem stress is put forward. The unified ecological carrying capacity appraisal method proposed by Gao Jixi, combined w...
The survey of fuzzy clustering method for image segmentation
图像分割中的模糊聚类方法

Li Xuchao,Liu Haikuan,Wang Fei,Bai Chunyan,<br>李,刘海宽,王飞,春艳
中国图象图形学报 , 2012,
Abstract: The fuzzy c-means (FCM) clustering algorithm for image segmentation is one of the striking research fields in recent decades.Based on the analysis of the FCM algorithm,we combine the current application research in image segmentation,and we analyze and compare it in terms of measuring the expressions of the FCM algorithm.In this paper,through three aspects,such as single-resolution,multi-resolution,and the integration of other algorithms,the advantages and disadvantages of the improved FCM algorithms are expounded.In the end,some challenges and possible trends are discussed.
多年冻土地区供水水源选择及其评价──以大兴安岭西林吉造纸厂用水为例

冰川冻土 , 1995,
Abstract: 根据西林吉多年冻土区水文地质条件分析,简述了地下水资源分布特征,在水源选择上,除考虑地表水之外,还要开发利用基岩裂隙水,并以融区储存量进行调节,以满足枯水期所需求的水量而达到稳定供水的目的进行了探讨。
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