检索结果-南通市图书馆

An Experimental Study on the Conductivity Changes in Coal during Methane Adsorption-Desorption and their Influencing Factors

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

Acta Geologica Sinica(English Edition) 2019年第3期93卷 704-717页

作者： CHEN yue MA Dongmin GUO Chen YANG Fu mu Tian GAO Zheng College of Geology and Environment Xi'an University of Science and TechnologyXi'an 710054ShaanxiChina Key Laboratory of Coal Resources Exploration and Comprehensive Utilization Ministry of Land and ResourcesXi'an 710021ShaanxiChina Post-doctorate R&D Base of Geological Resources and Geological Engineering Xi'an University of Science and TechnologyXi'an 710054ShaanxiChina Geological Research Institute for Coal Green Mining Xi'an University of Science and TechnologyXi'an 710054ShaanxiChina

During the processes of methane adsorption and desorption,the internal structure of coal changes,accordingly leading to changes in electrical *** this paper,using low rank coal seams of the Yan'an Formation in the Dafbsi field as the research subject,the relationship between coal resistivity,methane adsorption quantity,and equilibrium pressure is analyzed through proximate analysis,mercury injection tests,low temperature liquid nitrogen adsorption tests,and coal resistivity measurements during methane adsorption and *** results show that during the process of pressure rise and methane adsorption,the conductivity of coal increases,resulting from heat release from methane adsorption,coal matrix swelling and adsorbed water molecules replaced by methane,but the resistivity reduction gradually *** relationship between coal resistivity and methane adsorption quantity and equilibrium pressure can be described by a quadratic *** the processes of depressurization and desorption,the resistivity of coal rebounds slightly,due to decalescence of methane desorption,coal matrix shrinkage and water-gas displacement,and the relationship coincides with a linear *** adsorption leads to irreversible changes in coal internal structure and enhances the coal conductivity,and resistivity can not be restored to the initial level even after methane *** resistivity and reduction rate of durain are higher than those of vitrain,with relatively greater homogeneous pore throat structure and fewer charged particles in the double electric *** addition,moisture can enhance the conductivity of coal and makes it change more complexly during methane adsorption and desorption.

关键词： coal reservoir adsorption-desorption electric resistivity lithotype moisture

A BLG1 neural model implements the unique looming selectivity to diving target

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2023年第2期19卷 112-116页

作者： LUAN Hao HUA mu ZHANG Yicheng yue Shigang FU Qinbing School of Computer Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Computer Science University of LincolnLincoln LN67TSUK School of Automation Guangdong University of Petrochemical TechnologyMaoming 525000China School of Mathematics and Information Science Guangzhou UniversityGuangzhou 510006China

The bistratified lobula giant type 1(BLG1) neuron is an identified looming-sensitive neuron in crab's visual brain that demonstrates special sensitivity to diving targets, or descending approaching motions. In this paper, a novel neural model is proposed to shape such unique selectivity through incorporating a bio-plausible feedforward contrast inhibition synapse and a radially extending spatial enhancement distribution. Herein the synaptic connections and neuronal functions of this model are placed within a framework for matching and describing underlying biological findings. The systematic and comparative experiments have validated the proposed computational model that reconciles with the characteristics of BLG1 neurons in crab.

关键词： A BLG1 neural model diving target BLG

Tracking Control of a Class of Differential Inclusion Systems via Sliding Mode Technique

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2014年第3期11卷 308-312页

作者： Lei-Po Liu Zhu-mu Fu xiao-Na Song College of Electric and Information Engineering Henan University of Science and Technology

The tracking problem for a class of differential inclusion systems is investigated. Using global sliding mode control approach, a tracking control is proposed such that the output of a differential inclusion system tracks the desired trajectory *** extensive reaching law is proposed to achieve the chattering reduction. Finally, an example is given to illustrate the validity of the proposed design.

关键词： Tracking differential inclusion systems global sliding mode control chattering reduction an extensive reaching law

Bit error probability of distributed Turbo coded relay systems over quasi-static Rayleigh fading channels

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2010年第2期17卷 41-45页

作者： PENG yue-xing WU mu-zi ZHAO Hui WANG Wen-bo Wireless Signal Processing and Network Laboratory Key Lab of Universal Wireless Communications Ministry of Education School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

As is known, distributed Turbo coding （DTC） performs close to the theoretic outage probability bound of a relay channel when correct decoding is assumed at the relay. However, decoding error is inevitable in practical fading channels due to the error-prone feature of radio channels, and the decoding error propagation in DTC scheme will severely degrade the error performance of the relay system. As a result, it is necessary to evaluate the error performance of the DTC scheme in multi-hop relaying wireless systems in practical fading channels. Moreover, the theoretical method of analysis provides an effective tool for obtaining the error performance besides lengthy simulations. In this article, the concept of equivalent signal-to-noise ratio （SNR） of the two-hop relay channel and the method of computing equivalent SNR are developed, and then the upper bound on the bit error probability （BEP） of DTC relay systems is analyzed by use of Turbo code＇s distance spectrum, the concept of uniform interleaver, the limit-before-averaging technique, and the union bound method. Both theoretical analysis and numerical simulation are implemented for relay systems with DTC scheme over quasi-static Rayleigh fading channels. The results show that the upper bound approaches the simulation results in the medium to high SNR region.

关键词： bit error probability distributed Turbo code relay network union bound distance spectrum SNR

Integrating transcriptomes and somatic mutations to identify RNA methylation regulators as a prognostic marker in hepatocellular carcinoma

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2021年第1期20卷 34-45页

作者： yue Yan Yun-Hai Luo Dao-Feng Zheng Tong mu Zhong-Jun Wu Department of Hepatobiliary Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China

Background:RNA methylation modifying plays an important role in the occurrence and progression of a range of human cancers including hepatocellular carcinoma(HCC),which is characterized by a mass of genetic and epigenetic ***,the treatment targeting these alterations is ***:We used comprehensive bioinformatics analysis to analyze the correlation between cancerassociated RNA methylation regulators and HCC malignant features in network ***:We identified two HCC subgroups(cluster 1 and 2),which had clearly distinct clinicopathological,biofunctional and prognostic characteristics,by consensus *** cluster 2 subgroup correlated with malignancy of the primary tumor,higher tumor stage,higher histopathological grade and higher frequency of TP53 mutation,as well as with shorter survival when compared with cluster *** enrichment indicated that the cluster 2 correlated to the tumor malignancy signaling and biological *** on these findings,an 11-gene risk signature was built,which not only was an independent prognostic marker but also had an excellent power to predict the tumor ***:Our study indicated that RNA methylation regulators are vital for HCC malignant progression and provide an important evidence for RNA methylation,methylation regulators are actionable targets for anticancer drug discovery.

关键词： RNA methylation Hepatocellular carcinoma Prognostic marker Epigenetics

Science and technology innovation promotes realization of university education concept

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 107-109页

作者： mu Wen-jie TANG Xin-ying ZHOU xiao-guang Beijing University of Posts and Telecommunications Beijing 100876 China

In modem society, universities take on three main functions. Through science and technology innovation, it makes effort to create research achievements needed by society, promotes different modes of technology transfe... 详细信息

关键词： university function technology innovation technology transfer industry

Alga-lysing bioreactor and dominant bacteria strain

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2007年第5期19卷 546-552页

作者： PEI Hai-yan HU Wen-rong mu Rui-min LI xiao-cai College of Environmental Science and Engineering Ocean University of China Qingdao 266003 China Shandong Provincial Engineering Centre on Environmental Science and Technology Jinan 250061 China School of Environmental Science and Engineering Shandong University Jinan 250061 China

Alga-lysing bacteria have been paid much attention to in recent years. In this study, the alga-lysing strain P05 which was isolated from an immobilizing biosystem was immobilized by coke and elastic filler, forming two biological reactors. The removal efficiencies of algae, NH4^＋-N and organic matter using the two reactors were studied. The results showed that strain P05 was an ideal algal-lysing bacteria strain because it was easy to be immobilized by coke and elastic filler which are of cheap, low biodegradability and the simple immobilization procedure. After 7 d filming, the biological film could be formed and the reactors were used to treat the eutrophic water. These two reactors were of stability and high effect with low cost and easy operation. The optimal hydraulic retention time （HRT） of each reactor was 4 h. The algae removal rates were 80.38% and 82.1% （in term of Chl-α） of coke reactor and filler reactor, respectively. And that of NH4^＋-N were 52.3% and 52.7%. The removal rates of CODMn were 39.03% and 39.64%. The strain P05 was identified as Bacillus sp. by PCR amplification of the 16S rRNA gene, BLAST analysis, and comparison with sequences in the GenBank nucleotide database.

关键词： alga-lysing algae removal immobilization 16S rRNA Bacillus sp.

On the Mixed Propagator Approach to ρ-ω Mixing

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第8期38卷 195-199页

作者： YAN mu-Lin JIANG Ji-Hao WANG xiao-Jun CCAST World Laboratory P.O. Box 8730 Beijing 100080 China Center for Fundamental Physics University of Science and Technology of China Hefei 230026 China CCAST World Laboratory P.O. Box 8730 Beijing 100080 China Center for Fundamental Physics University of Science and Technology of China Hefei 230026 China Instite of Theoretical Physics Academia Sinica Beijing 100080 China

The mixed propagator (MP) approach to ρ-ω mixing is discussed. It is found that under the pole-approximation assumption the results of MP approach is not compatible both with the effective Lagrangian theory andwith the experiment measurement criterion. To overcome these inconsistent, we propose a new MP approach in whichthe physical states of ρ and ω are determined by the requirement of experimental measurement to meson resonance. Interms of this new MP approach, the EM pion form factor Fπ and form factors of ρo →π0γ and of ω→πo γ are *** results of Fπ are in good agreement with data. The form factor of ρo →π0γ exhibits a hidden charge-asymmetryenhancement effect which agrees with the prediction of the effective Lagrangian theory.

关键词： isospin breaking, VMD, ρ-ω mixing, decay of vector mesons

Photosensitivity and a precise combination of size-dependent lambda-cyhalothrin microcapsules synergistically generate better insecticidal efficacy

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

Journal of Integrative Agriculture 2023年第5期22卷 1477-1488页

作者： GAO yue LUO Jian SUN yue ZHANG Hua-wei ZHANG Da-xia LIU Feng mu Wei LI Bei-xing Key Laboratory of Pesticide Toxicology&Application Techniques Shandong Agricultural UniversityTai’an 271018P.R.China College of Plant Protection Shandong Agricultural UniversityTai’an 271018P.R.China Heilongjiang Forest Industry Agrochemical Co. Ltd.Harbin 150324P.R.China

In this study, lambda-cyhalothrin(LC) loaded polyurea microcapsules(MCs) with different particle sizes were *** of the MCs showed varying degrees of physical collapse, which was more obvious among those with smaller particle sizes. MCs with particle sizes of 1.38 μm(MC-S), 5.13 μm(MC-M) and 10.05 μm(MC-L) had shell thicknesses of 39.6,50.3 and 150.1 nm, respectively. MCs with smaller particles tended to have significantly faster release profiles, and the MC-S group had much higher bioactivity against Agrotis ipsilon and better foliar affinity on the peanut leaves(indicated by rainfastness) than MC-M and MC-L. All of the MCs exhibited light-enhanced release profiles and had much slower degradation compared with the emulsifiable concentrate(EC) group, among which MC-L had the slowest *** generate MCs with both favorable quick efficacy and long-lasting efficacy, binary mixtures of MC-S, MC-M and MC-L were produced by mixing them in pairs at ratios of 2:1, 1:1 and 1:2. The mixture of MC-S:MC-L at 1:2 showed the best comprehensive efficacy in the peanut foliar spray scenario among the nine tested combinations, and its effective duration was three times longer than that of EC. Overall, the precise combination of MCs with different particle sizes can regulate the efficacy of pesticide control and serve as a strategy for the better utilization of pesticides.

关键词： polyurea microcapsules size control combination strategy pest control initial and long-term efficacy