检索结果-南通市图书馆

An Examination of Some Factory Physics Principles

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2016年第2期4卷 131-145页

作者： Hong Chen heng-Qing ye Shanghai Advanced Institute of Finance Shanghai Jiaotong UniversityShanghai 200240China Faculty of Business Hong Kong Polytechnic UniversityHong KongChina

In this paper,we examine some principles in managing manufacturing sys*** principles are concerned with the variability,the utilization,the rework,the lead time,and the constant work-in-process *** these principles are developed through analyzing some simpler disconnected flow line manufacturing systems,we examine whether they can have broad *** some of these principles,we provide sufficient conditions,while for others,we provide counterex*** analysis suggests that we should be very cautious about these laws when applied to non-Markov and non-tandem systems.

关键词： Factory physics Manufacturing system Variability Utilization Rework Constant work-in-process Lead time

Co-delivery of Andrographolide and Notch1-targeted siRNA to Macrophages with Polymer-based Nanocarrier for Enhanced Anti-inflammation

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

Chinese Journal of Polymer Science 2018年第12期36卷 1312-1320页

作者： Teng Wu Min Tan heng-ye Gong Yong Wang Xin-Tao shuai PCFM Lab of Ministry of Education School of Materials Science and Engineering Sun Yat-Sen University Guangzhou 510275 China Center of Biomedical Engineering Zhongshan School of Medicine Sun Yat-sen University Guangzhou 510080 China

Chronic inflammatory responses induced by macrophages play a pivotal role in the progression of atherosclerosis. In the present study, a multifunctional nanocarrier based on poly（ethylene glycol）-block-poly（L-aspartic acid） grafted with diethylenetriamine, lysine and cholic acid （PEG-PAsp（DETA）-Lys-CA2） polymer was synthesized for co-delivery of andrographolide and siRNA targeting Notchl gene to alleviate the inflammatory response in macrophages. The nanocarrier exerted low cytotoxicity as well as high performance in drug/siRNA co-delivery. In vitro studies demonstrated the co-delivery of andrographolide and Notchl siRNA not only significantly inhibited lipopolysaccharide （LPS）-activated interleukin-6 （IL-6） and monocytes chemotactic protein 1 （MCP-1） expression as well as blocked nuclear factor-rd3 （NF-rd3） signal activation, but also interfered the Notchl gene expression and increased anti-inflammatory cytokines such as interleukin-10 （IL-10） and arginase-1 expression obviously in macrophages. These results suggested that the combination therapy based on Notchl siRNA and andrographolide co-delivered nanocarrier, i.e. suppressing the expression of proinflammatory cytokines while simultaneously increasing anti-inflammatory factors expression, be a feasible strategy for atherosclerosis treatment.

关键词： Macrophages Anti-inflamatory Andrographolide Notchl siRNA

Iso-structural phase transition in tetramethylammonium nickel(Ⅱ)nitrite[(CH_3)_4N][Ni(NO_2)_3]

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第6期25卷 844-848页

作者： Li-Hui Kong Da-Wei Fu Qiong ye heng-Yun ye Yi Zhang Ren-Gen Xiong Ordered Matter Science Research Center Southeast University

The title compound, tetramethylammonium nickel nitrite [（CH3）4N][Ni（NO2）3], has a hexagonal perovskite-type structure with formula ABX3. It undergoes two reversible phase transitions occurring at about 409.1 and 428.4 K, associated with dielectric transitions. DSC measurement and dielectric measurement confirm the transition. The variable-temperature X-ray structural determinations and the powder X-ray diffraction （PXRD） experiments reveal that this compound has the same space group P3ml （No. 164） at 293 K, 413 K and 438 K. The phase transitions are caused by the rotation of the [（CH3）4N]＋ cation.

关键词： Phase transition Dielectric DSC PXRD X-ray structural Perovskite-type structure

Comparative studies of versatile extracellular proteolytic activities of lactic acid bacteria and their potential for extracellular amino acid productions as feed supplements

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2019年第3期10卷 789-801页

作者： ye heng Lim Hooi Ling Foo Teck Chwen Loh Rosfarizan Mohamad Norhani Abdullah Institute of Bioscience Universiti Putra Malaysia43400 UPMSerdangSelangorMalaysia Department of Bioprocess Technology Faculty of Biotechnology and Biomolecular SciencesUniversiti Putra Malaysia43400 UPMSerdangSelangorMalaysia Department of Animal Sciences Faculty of AgricultureUniversiti Putra Malaysia43400 UPMSerdangSelangorMalaysia Institute of Tropical Agriculture and Food Security Universiti Putra Malaysia43400 UPMSerdangSelangorMalaysia Institute of Tropical Forestry and Forest Products Universiti Putra Malaysia43400 UPMSerdangSelangorMalaysia

Background:Increasing understanding on the functions of amino acids (AA) has led to new commercial applications and expansion of the worldwide ***,the current technologies rely heavily on non-food grade microorganism and chemical synthesis for the production of *** studies reported that lactic acid bacteria (LAB) have the capability of producing AA owing to their well-established proteolytic system and amino acid biosynthesis ***,the objectives of this study were to explore the extracellular proteolytic activity of LAB isolated from various Malaysian fermented foods and their potential to produce AA extracellularly as feed ***:All the studied LAB isolates were versatile extracellular protease producers,whereby extracellular protease activities were detected from acidic to alkaline pH (pH 5,pH 6.5,pH 8) using qualitative and quantitative proteolytic *** highest proteolytic activity at pH 5 (15.76 U/mg) and pH 8 (19.42 U/mg) was achieved by Lactobacillus plantarum RG14,while Lactobacillus plantarum RS5 exhibited the highest proteolytic activity of 17.22 U/mg at pH *** for the results of AA production conducted in de Man,Rogosa and Sharpe medium and analysed by high pressure liquid chromatography system,all LAB isolates were capable of producing an array of ***,Pediococcus *** greater ability for AA production as compared to Lactobacillus ***,the studied LAB were able to produce a few major feed supplement AA such as methionine,lysine,threonine and *** TL-3 recorded the highest methionine and threonine productivity of 3.72 mg/L/h and 5.58 mg/L/h ***,*** I-UL4 demonstrated a lysine productivity of 1.24 mg/L/h,while *** TP-6 achieved up to 1.73 mg/L/h of tryptophan ***:All the 17 studied LAB isolates possessed versatile extracellular proteolytic system and have vast capability of producing various amino acids including a

关键词： Amino acid Bio-agent Extracel ular proteolytic activity Feed supplement Lactic acid bacteria Lactobacil us Pediococcus

Flow characteristics of silicon oil in nanochannels

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2021年第6期33卷 1282-1290页

作者： Yong Wang Fu-quan Song Kai Ji ye-heng Sun Wei-yao Zhu Xiao-hong Wang School of Engineering Science University of Science and Technology of ChinaHefei 230026China School of Petrochemical and Energy Engineering Zhejiang Ocean UniversityZhoushan 316022China Exploration and development scientific research institute of Shengli oil field branch of Sinopec Dongying 257015China Civil and Resource Engineering School University of Science and Technology BeijingBeijing 100083China

The nonlinear flow of liquids through nanoscale channels play an important role in the separation and purification properties of porous membranes,the manufacture of biofilm ionic channels and microfluidic chips,the production of micro electro-mechanical *** oil flow experiments were conducted through anodic alumina films with pore sizes of 26,67,89,and 124 nm,in which flow mechanism and characteristics of the oil through the nanoscale channels were *** nanoflow features are revealed:(1)The experimental flow rate is less than the theoretical flow rate through nanochannels,as solid-liquid interaction increasing flow resistance.(2)At small shear rate,the boundary layer is one,indicating existence of a threshold pressure of oil flow through nanochannels.(3)The boundary layer decreases with the increasing of shear rate,and it rapidly decreases as shear rate increases when the value of shear rate is small.(4)The drag coefficient decreases nonlinearly with increasing shear rate,decreasing more slowly when value of shear rate is big,and trending towards 1 in the case of large shear *** is shown that the non-linearity of flow is induced by great solid-liquid interaction in nano and microscale,and increasing the driving force can raise the efficiency at the nanometer scale.

关键词： Nano and microflow nanofluid threshold pressure the boundary layer tight reservoir

Temperature-triggered phase transition in pyridazine hexafluorophosphate

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

Chinese Chemical Letters 2015年第1期26卷 145-148页

作者： Dong-Yan Wang Li-Li Qin Xue-Li Hou heng-Yun ye Ordered Matter Science Research Center Southeast University

The pyndazine hexafluorophosphate[C4H5N2]~＋[PF6]^-（1） undergoes a reversible phase transition around140 K,which was confirmed by the DSC measurement.Variable-temperature crystal structures determined at 293 K and 93 K show that the compound crystallizes in the same space group P21/c,indicating that 1 undergoes an iso-structural phase *** the temperature decreases,dielectric measurement of the title compound shows no significant change around the phase transition *** hydrogen bonds are found between molecules at 293 K and 93 l〈 with similar packing *** most distinct difference between the low temperature and room temperature structures is the order-disorder transition of the hexafluorophosphate anion,which is probably the driving force of the phase transition.

关键词： Phase transition Dielectric DSC Crystal structure

An ultrathin and continuous Li_4Ti_5O_(12) coated carbon nanofiber interlayer for high rate lithium sulfur battery

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第4期28卷 19-26页

作者： Decheng An Lu Shen Danni Lei Lehong Wang heng ye Baohua Li Feiyu Kang Yan-Bing He Engineering Laboratory for the Next Generation Power and Energy Storage Batteries Graduate School at Shenzhen Tsinghua University Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University

Severe capacity fading and poor high rate performance of lithium sulfur(Li–S) battery caused by "shuttle effect" and low conductivity of sulfur hampers its further developments and applications. Li_4Ti_5O_(12) (LTO)possesses high lithium ion conductivity, and it is also can be used as an active adsorbent for polysulfide. Herein, fine LTO particle coated carbon nanofibers(CNF) were prepared and a conductive network both for electron and lithium ion was built, which can greatly promote the electrochemical conversion of polysulfide and improve the rate performance of Li–S batteries. Meanwhile, a quantity of adsorption sites is constructed by defects of the surface of LTO-CNF membrane to effectively immobilize polysulfide. The multifunctional LTO-CNF interlayer could impede the shuttle effect and enhance comprehensive electrochemical performance of Li–S batteries, especially high rate performance. With such LTO-CNF interlayer,the Li–S battery presents a specific capacity of 641.9 mAh/g at 5 C rate. After 400 cycles at 1 C, a capacity of 618.0 mAh/g is retained. This work provides a feasible strategy to achieve high performance of Li–S battery for practical utilization.

关键词： Lithium sulfur batteries Li4Ti5O12 (LTO) Interlayer Polysulfide adsorbent Polysulfide conversion

COMPUTATIONAL RESEARCH ON WAVE MAKING OF MOVING WIGLEY HULL IN TIME DOMAIN

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第4期20卷 469-476页

作者： YANG Xiang-hui ye heng-kui FENG Da-kui LIU Juan College of Traffic Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Ship Information Center Beijing 100085 China

Based on Green＇s theorem, a time domain numerical model was constructed to simulate wave making phenomenon caused by a moving ship. In this article, the Rankine sources and dipoles were placed on boundary surfaces （i.e., the ship surface and free surface）, and a time-stepping scheme was employed. Its unique characteristic is that steady state can be realized from initial value by employing the time-stepping scheme and unsteady free surface conditions. In time domain, if the results of unsteady flow problem tend to data stabilization after many time steps of computation, they could be regarded as the data of steady ones. This model could be employed to steady or unsteady problems. Theoretical reasoning and computational process of this method was described in detail The linear and nonlinear boundary conditions on body surface were studied, and the relative means to realize these boundary conditions in iterative computation were also discussed. Some proper parameters about the model of the Wigley hull were determined by many numerical tests, and their influences on wave making resistance and wave pattern were discussed. According to the comparison between numerical results and data available in relative references, the method used in this work is proven to be a reliable method in time domain. And the lattice reorganization in every time step computation is a feasible numerical approach.

关键词： Rankine source dipole time domain Wigley hull lattice reorganization time-stepping scheme Green's theorem

Interactions between dislocations and twins in deformed titanium aluminide crystals

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第3期35卷 402-408页

作者： Guang Yang Shang-Yi Ma Kui Du Dong-Sheng Xu Sen Chen Yang Qi heng-Qiang ye School of Materials Science and Engineering Northeastern University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Division of Titanium Alloys Institute of Metal Research Chinese Academy of Sciences Department of Materials Physics and Chemistry School of Materials Science and Engineering Northeastern University

Using scanning, transmission electron microscopy and aberration-corrected scanning transmission electron microscopy, we have studied the interactions between dislocations and twins in impact deformed polysynthetic twinned TiAl crystal. The 1/3 dislocations with the coherent twin *** abnormal stacking fault was found adjacent to the coherent twin boundary. It has the same stacking sequence but different atom species in the [110] direction with an additional displacement of 1/4[110]in two neighboring {111} layers, and is likely induced by the slip of a 1/12[112](i.e. 1/4[110] + 1/6[211])dislocation.

关键词： TiAl Dynamic deformation Twins Dislocations Abnormal stacking fault