检索结果-南通市图书馆

Journal of Chemistry and Chemical engineering 2010年第6期4卷 46-48页

作者： Bilel Hadrich Nabil Kechaou Process engineering Group Agri-food Research Unit and Applied Fluid Mechanics Modeling National Engineering School of SfaxSfax 3038 Tunisia

Four empirical models are tested for fitting the T-y-x equilibrium data of ethanol-water mixture by minimizing the Root Mean Square （RMS） between equilibrium data and theoretical points. The total pressure of the correspondent data is 101.3 kPa. All models parameters are also identified. The study suggests that NRTL model fits the equilibrium data best with RMS = 0.4 %.

关键词： Equilibrium datas models ethanol-water mixture.

Building Quantitative Gene Regulatory Mechanism in Quorum Sensing in <i>Pseudomonas aeruginosa</i>Using Transcriptomic Data

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 Biomedical Science and engineering 2020年第2期13卷 13-35页

作者： Shaomin Yan Guang Wu State Key Laboratory of Non-food Biomass and Enzyme Technology National Engineering Research Center for Non-Food Biorefinery Guangxi Key Laboratory of Biorefinery Guangxi Academy of Sciences Nanning China

A large amount of transcriptomic data provides opportunities 1) to verify the gene regulatory mechanism, which is usually obtained from a single experiment, at population level;2) to uncover the gene regulatory mechanism at population level;and 3) to build a quantitatively gene regulatory mechanism. One of the best studied regulatory mechanisms in bacteria is the quorum sensing (QS), which plays an important role in regulation of bacteria population behaviors such as antibiotic production, biofilm formation, bioluminescence, competence, conjugation, motility and sporulation. Pseudomonas aeruginosa is a Gram-negative bacterium causing diseases in plants, animals, humans, and its biofilm and drug-resistance become great concerns in clinics. P. aeruginosa has three QS systems including a specific one for Pseudomonas. In this study, the transcriptomic data of P. aeruginosa were combined from 104 publications and QS gene expressions were analyzed under different experimental conditions. The results demonstrate the quantitatively regulatory mechanisms of QS genes at population level including 1) to rank and group QS-related genes according to their activity;2) to quantitatively define the role of a single global regulator;3) to find out the probability that a global regulator impacts QS genes and the probability that a QS gene responds to global regulators;and 4) to search for overlapped genes under four types of experimental conditions. These results provide integrative information on understanding the regulation of QS genes at population level.

关键词： Gene Quantitative Regulatory Mechanism Pseudomonas aeruginosa Quorum Sensing Transcriptomic Analysis

Capacity and Flexibility Improvement of Traffic Aggregation for Fixed 5G:Key Enabling Technologies,Challenges and Trends

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2022年第12期19卷 1-13页

作者： Jing Zhang Tianhai Chang Zhuqiang Zhong Xianqing Jin Shaohua Hu Taowei Jin Jiahao Zhou Mingyue Zhu Yi Yu Jianming Tang Liangchuan Li Kun Qiu School of Communication and Information engineering University of Electronic Science and Technology of ChinaChengduSichuan 611731China Optical Research dept Huawei Technologies518129ShenzhenChina School of Electronic engineering Bangor UniversityBangorLL571UTUK

As the emergence of various highbandwidth services and the requirements to support 5G/Wi-Fi 6 wireless networks,the next generation fixed networks,i.e.F5G,are expected to be realized in the 5G era.F5G is endowed with new characteristics,including ultra-high bandwidth,all-optical connections and optimal service *** the prospect of optical-to-everywhere,optical technologies are used for mobile front-haul,mid-haul,and *** access networks would play an important role in F5G to support radio access network and fixed access ***-latency PON is a key for cost effective-haul traffic *** terms of signal transmission,intensity modulation directdetection(IM-DD)is a promising scheme due to its simple *** fundamental challenge associated with direct-detection is the disappearance of the transmitted signal’s *** access network,the flexibility and low latency are the two key factors affecting service *** this article,we review the evolution of PONs and the challenges of current PONs in *** analyze key enabling digital signal processing(DSP)techniques,including detection linearization for direct-detection and simplified coherent detection,adaptive equalizers,digital filer enabled flexible access network and low-latency inter-ONU ***,we discuss the developing trends of future optical access networks.

关键词： optical fiber communication flexible access network optical field recovery inter-ONU communication

Uptake of Polycyclic Aromatic Hydrocarbons across Bacterial Membrane

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Advances in Microbiology 2020年第7期10卷 331-348页

Polycyclic aromatic hydrocarbons (PAHs) are important pollutants, whose biodegradation and bioremediation with microorganisms are the promising ways to clean environments and reduce their exposure to humans. Although the transportation of PAHs across bacterial membrane is the first step forwards their biodegradation, it receives less attention. In this mini-review, we explore which transport system for uptake of carbon sources can serve for uptake of PAHs in bacteria, and try to uncover some patterns in their transport mechanisms. Collectively, 1) the major carbohydrate transport system, PTS, is unlikely to take PAHs because PAHs lack a hydroxy group for phosphorylation but aromatic acids are good candidates;2) PAHs could probably go through H+ symporters, especially the low-molecular-weight PAHs, which are partially dissolvable in water;3) it is unlikely that PAHs can produce chemiosmotic ion gradients to go through uniporters;and 4) antiporters could serve as transporters to transport PAHs across bacterial membrane only after the metabolism of PAHs generates extra H+ inside cell. Accordingly, the basic mechanism for uptake of PAHs is whether they can donate H+ in order to generate an electrochemical proton gradient to go through symporters.

关键词： Bacteria Polycyclic Aromatic Hydrocarbon Transport Mechanisms

A 12GHz Band Linearly Polarized High-Gain Microstrip Array Antenna Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A 12GHz Band Linearly Polarized High-Gain Microstrip Array A...

Elaboration of Simplest Folding Structures in 2-Dimensional Lattice with Delta-Hemolysin and Its Variants in HP Model

1997 International Symposium on Electromagnetic Compatibility

作者： JIA Zhenyi ZHANG Zhilan dept.of Electronics ＆ Information engineering Hebei University

＜正＞In this paper,development of a linearly polarized microstrip array antenna with a gain of 34dB at 12GHz is *** antenna is applied for receiving direct broadcast from a *** antenna is parallel and series fed by m... 详细信息

ISBN: (纸本)0780336089

关键词： microstrip antenna arrays satellite antennas direct broadcasting by satellite receiving antennas broadcast antennas antenna feeds 12 GHz linearly polarized high-gain microstrip array antenna study gain satellite direct broadcasting parallel fed antenna series fed antenna microstrip transmission lines efficiency cross-polarization 34 dB 12 GHz

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

Journal of Biomedical Science and engineering 2019年第5期12卷 293-309页

作者： Shaomin Yan Guang Wu State Key Laboratory of Non-food Biomass Enzyme Technology National Engineering Research Center for Non-Food Biorefinery Guangxi Key Laboratory of Biorefinery Guangxi Academy of Sciences Nanning China

Although the advanced 3-dimensional structure measurements provide more and more detailed structures in Protein Data Bank, the simplest 2-dimensional lattice model still looks meaningful because 2-dimensional structures play a complementary role with respect to 3-dimensional structures. In this study, the folding structures of delta-hemolysin and its six variants were studied at 2-dimensional lattice, and their amino acid contacts in folding structures were considered according to HP model with the aid of normalized amino acid hydrophobicity index. The results showed that: 1) either delta-hemolysin or each of its variants could find any of its folding structure in one eighth of 1,129,718,145,924 folding structures because of symmetry, which reduces the time required for folding, 2) the impact of pH on folding structures is varying and associated directly with the amino acid sequence itself, 3) the changes in folding structures of variants appeared different case by case, and 4) the assigning of hydrophobicity index to each amino acid was a way to distinguish folding structures at the same native state. This study can help to understand the structure of delta-hemolysin, and such an analysis can shed lights on NP-problem listed in millennium prize because the HP folding in lattice belongs to a sub-problem of NP-problem.

关键词： Folding Structure Delta-Hemolysin HP Model Hydrophobicity Index Lattice Minimal Energy Native State

Automatic software fault localization based on artificial bee colony

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 Systems engineering and Electronics 2015年第6期26卷 1325-1332页

作者： Linzhi Huang Jun Ai School of Reliability and Systems engineering Beihang University

Software debugging accounts for a vast majority of the financial and time costs in software developing and maintenance. Thus, approaches of software fault localization that can help automate the debugging process have become a hot topic in the field of software engineering. Given the great demand for software fault localization, an approach based on the artificial bee colony （ABC） algorithm is proposed to be integrated with other related techniques. In this process, the source program is initially instrumented after analyzing the dependence information. The test case sets are then compiled and run on the instrumented program, and execution results are input to the ABC algorithm. The algorithm can determine the largest fitness value and best food source by calculating the average fitness of the employed bees in the iteralive process. The program unit with the highest suspicion score corresponding to the best test case set is regarded as the final fault localization. Experiments are conducted with the TCAS program in the Siemens suite. Results demonstrate that the proposed fault localization method is effective and efficient. The ABC algorithm can efficiently avoid the local optimum, and ensure the validity of the fault location to a larger extent.

关键词： software debugging software fault localization arti-ficial bee colony (ABC) algorithm program instrumentation.

Adaptation in polymerase basic protein 1 family from influenza A virus to climate change

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Health 2012年第10期4卷 968-973页

Global climate changes affect the functioning of ecosystems, in particular host-pathogen interactions, with major consequences in health ecology, however, it is less addressed how the change in global temperature affects the protein family of influenza virus. In this study, we studied the adaptation of polymerase basic protein 1 (PB1) family from influenza A virus to temperature change. 3841 PB1 proteins sampled from 1956-2011 were quantified by the amino-acid pair predictability and then compared their general changes with the temperature changes (Had-CRUT3v and CRUTEM4v data sets) of corresponding years on a 5? by 5? grid-box basis. Also, point-to-point comparisons were conducted from 1956 to 1998 in all and different species. The results showed that both changes in the temperature and unpredictable portion of PB1 proteins had similar trends from 1956 to 2011, which provides the evidence of virus adaptation at protein level to climate change.

关键词： Adaptation Evolution Influenza A Virus Polymerase Basic Protein 1 Temperature Change

Review on electrochemical carbon dioxide capture and transformation with bipolar membranes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国化学快报:英文版 2023年第8期34卷 114-129页

作者： Jinyun Xu Guoqiang Zhong Minjing Li Di Zhao Yu Sun Xudong Hu Jiefang Sun Xiaoyun Li Wenju Zhu Ming Li Ziqi Zhang Yu Zhang Liping Zhao Chunming Zheng Xiaohong Sun School of Chemical engineering Tianjin Key Laboratory of Green Chemical Technology and Process EngineeringState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China School of Materials Science and engineering Key Laboratory of Advanced Ceramics and Machining TechnologyMinistry of EducationTianjin UniversityTianjin 300072China Beijing Key Laboratory of Diagnostic and Traceability Technologies for food poisoning Beijing Center for Disease Prevention and ControlBeijing 100013China Advanced Materials Research Laboratory CNOOC Tianjin Chemical Research and Design InstituteTianjin 300131China

Anthropogenic carbon dioxide(CO_(2))emission from the combustion of fossil fuels aggravates the global greenhouse *** implementation of CO_(2)capture and transformation technologies have recently received great attention for providing a pathway in dealing with global climate *** these technologies,electrochemical CO_(2)capture technology has attracted wide attention because of its environmental friendliness and flexible operating *** membranes(BPMs)are considered as one of the key components in electrochemical devices,especially for electrochemical CO_(2)reduction and electrodialysis *** create an alkaline environment for CO_(2)capture and a stable pH environment for electrocatalysis on a single *** key to CO_(2)capture in these devices is to understand the water dissociation mechanism occurring in BPMs,which could be used for optimizing the operating conditions for CO_(2)capture and *** this paper,the references and technologies of electrochemical CO_(2)capture based on BPMs are reviewed in detail,thus the challenges and opportunities are also discussed for the development of more efficient,sustainable and practical CO_(2)capture and transformation based on BPMs.

关键词： Bipolar membranes Carbon dioxide Electrochemical capture Transformation CO_(2)reduction Electrodialysis devices Water dissociation