检索结果-南通市图书馆

同方期刊数据库

The Vitamin A nutritional status among children and adults in Zhejiang province,China

在线全文

学校读者我要写书评

暂无评论

The Vitamin A nutritional status among children and adults i...

Lattice Boltzmann simulation of fluid flow through coal reservoir's fractal pore structure

2017浙江省营养学会年会暨西湖营养学术论坛

作者： zhu yibo Zhejiang CDC

Objective:To evaluate the vitamin A status,and it’s influencing factors among children and adults in Zhejiang ***:The Chinese National Nutrition and Health Survey was conducted.A total of 1293 participants(585 children and 708 adults) were enrolled in Zhejiang from 2010 to *** was collected through questionnaire,physical examination,dietary survey and laboratory *** retinol levels were determined by the high-performance liquid chromatography ***,dietary intakes of vitamin A were evaluated by Chinese Recommended Nutrient *** conducted multivariable linear regression to test the influencing factors associated with serum vitamin ***:Median serum retinol value was 0.451μg/ml for the children,and 0.621μg/ml for the adults.96.4%of the children and 98.4%of the adults were free of vitamin A *** was no significant correlation between serum vitamin A value and vitamin A consumption evaluated by 24-hour dietary recall for 3 *** who had a history of eating mutton,poultry,pork liver,and other pluck had significant higher level of serum vitamin A compared with those who didn’*** also found that age,sex,BMI,serum triglyceride,dietary of poultry and pork liver were significantly associated with serum vitamin A ***:Generally,Vitamin A was adequate in both children and adults of Zhejiang province.

关键词： Vitamin A Dietary Nutrition status

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

Science China Earth Sciences 2013年第12期56卷 1519-1530页

作者： JIN Yi SONG HuiBo HU Bin zhu yibo ZHENG JunLing School of Resources and Environment Henan Polytechnic University Key Laboratory of Biogenic Traces & Sedimentary Minerals of Henan Province

The influences of fractal pore structure in coal reservoir on coalbed methane(CBM) migration were analyzed in detail by coupling theoretical models and numerical *** types of fractals were generated based on the construction thought of the standard Menger Sponge to model the 3D nonlinear coal pore *** a correlation model between the permeability of fractal porous medium and its pore-size-distribution characteristics was derived using the parallel and serial modes and verified by Lattice Boltzmann Method(LBM).Based on the coupled method,porosity(ф),fractal dimension of pore structure(Db),pore size range(rmin,rmax) and other parameters were systematically analyzed for their influences on the permeability(ф) of fractal porous *** results indicate that:① the channels connected by pores with the maximum size(rmax) dominate the permeability,approximating in the quadratic law;② the greater the ratio of r max and r min is,the higher is;③ the relationship between D b and follows a negative power law model,and breaks into two segments at the position where Db ≌*** on the results above,a predicting model of fractal porous medium permeability was proposed,formulated as k=cfrnmax,where C and n(approximately equal to 2) are constants and f is an expression only containing parameters of fractal pore *** addition,the equivalence of the new proposed model for porous medium and the Kozeny-Carman model k=Crn was verified at Db =2.0.

关键词： Lattice Boltzmann simulation of fluid flow through coal reservoir's fractal pore structure

同方期刊数据库

Compact CMOS spectral sensor for the visible spectrum

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2019年第9期7卷 961-966页

作者： yibo zhu XIN LEI KEN XINGZE WANG ZONGFU YU Coherent AI LLC Redwood CityCalifornia94065USA School of Physics Huazhong University of Science and TechnologyWuhan430079China Department of Electrical and Computer Engineering University of Wisconsin–MadisonMadisonWisconsin53705USA

A compact single-shot complementary metal-oxide semiconductor(CMOS) spectral sensor for the visible range(wavelength 400–700 nm) is presented. The sensor consists of two-dimensional silicon nitride-based photonic crystal(PC) slabs atop CMOS photodetectors. The PC slabs are fabricated using one-step lithography and amenable to monolithic integration into CMOS image sensors. Featuring a small footprint of 300 μm× 350 μm,the sensor can successfully measure the spectra over the 400–700 wavelength range with a best resolution of1 nm. The footprint of the sensor may be further reduced to enable hyperspectral imaging with high spatial resolution.

关键词： PC red Compact CMOS spectral sensor for the visible spectrum

Pseudomonas aeruginosa regulator PvrA binds simultaneously to multiple pseudo-palindromic sites for efficient transcription activation

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第5期67卷 900-912页

作者： yibo zhu Bingnan Luo Xingyu Mou Yingjie Song Yonghong Zhou Yongbo Luo Bo Sun Youfu Luo Hong Tang Zhaoming Su Rui Bao Center of Infectious Diseases Division of Infectious Diseases in State Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengdu 610041China Department of Geriatrics and National Clinical Research Center for Geriatrics West China HospitalSichuan UniversityChengdu 610041China Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau Ministry of EducationSchool of Ecology and EnvironmentTibet UniversityLhasa 850000China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China College of Life Science Sichuan Normal UniversityChengdu 610101China Accurate Biotechnology(Hunan)Co. LtdChangsha 410006China

Tetracycline repressor(TetR)family regulators(TFRs)are the largest group of DNA-binding transcription factors and are widely distributed in bacteria and *** play vital roles in controlling the expression of various genes and regulating diverse physiological ***,a TFR protein Pseudomonas virulence regulator A(PvrA),was identified from Pseudomonas aeruginosa as the transcriptional activator of genes involved in fatty acid utilization and bacterial ***,we show that PvrA can simultaneously bind to multiple pseudo-palindromic sites and upregulate the expression levels of target ***-electron microscopy(cryo-EM)analysis indicates the simultaneous DNA recognition mechanism of PvrA and suggests that the bound DNA fragments consist of a distorted B-DNA double *** crystal structure and functional analysis of PvrA reveal a hinge region that secures the correct domain motion for recognition of the promiscuous ***,our results showed that mutations disrupting the regulatory hinge region have differential effects on biofilm formation and pyocyanin biosynthesis,resulting in attenuated bacterial ***,these findings will improve the understanding of the relationship between the structure and function of the TetR family and provide new insights into the mechanism of regulation of *** virulence.

关键词： Pseudomonas aeruginosa transcription regulator TetR protein-structure virulence

High yield production of ultrathin fibroid semiconducting nanowire of Ta2Pd3Se8

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第9期13卷 1627-1635页

作者： Xue Liu Sheng Liu Liubov Yu.Antipina yibo zhu Jinliang Ning Jinyu Liu Chunlei Yue Abin Joshy Yu zhu Jianwei Sun Ana M.Sanchez Pavel B.Sorokin Zhiqiang Mao Qihua Xiong Jiang Wei Department of Physics and Engineering Physics Tulane UniversityNew OrleansLouisiana70118USA Division of Physics and Applied Physics Nanyang Technological UniversitySingapore637371Singapore National University of Science and Technology“MISiS” Moscow119049Russia Department of Polymer Science The University of AkronAkronOhio44325USA Technological Institute for Superhard and Novel Carbon Materials Moscow108840Russia Moscow Institute of Physics and Technology Dolgoprudny141700Russia Department of Mechanical Engineering Columbia UniversityNew YorkNew York10027USA Department of Physics University of WarwickCoventryCV47ALUK

Immediately after the demonstration of the high-quality electronic properties in various two dimensional(2D)van der Waals(vdW)crystals fabricated with mechanical exfoliation,many methods have been reported to explore and control large scale *** with recent advancements in fabricating 2D atomic layered crystals,large scale production of one dimensional(1D)nanowires with thickness approaching molecular or atomic level still remains ***,we demonstrate the high yield production of a 1D vdW material,semiconducting Ta2Pd3Se8 nanowires,by means of liquid-phase *** thinnest nanowire we have readily achieved is around 1 nm,corresponding to a bundle of one or two molecular *** electron microscopy(TEM)and transport measurements reveal the as-fabricated Ta2Pd3Se8 nanowires exhibit unexpected high crystallinity and chemical *** low-frequency Raman spectroscopy reveals clear evidence of the existing of weak inter-ribbon *** fabricated nanowire transistors exhibit high switching performance and promising applications for photodetectors.

关键词： van der Waals nanowire 1D semiconductor liquid exfoliation micro Raman spectroscopy electronic and optoelectronic device

Optical conductivity-based ultrasensitive mid-infrared biosensing on a hybrid metasurface

维普期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2018年第1期7卷 405-415页

作者： yibo zhu Zhaoyi Li zhuang Hao Christopher DiMarco Panita Maturavongsadit Yufeng Hao Ming Lu Aaron Stein Qian Wang James Hone Nanfang Yu Qiao Lin Department of Mechanical Engineering Columbia UniversityNew YorkNY 10027USA Department of Applied Physics and Applied Math Columbia UniversityNew YorkNY 10027USA Department of Chemistry and Biochemistry University of South CarolinaColumbiaSC 29208USA National Laboratory of Solid State Microstructures College of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNY 11973USA

Optical devices are highly attractive for biosensing as they can not only enable quantitative measurements of analytes but also provide information on molecular ***,typical refractive index-based optical sensors do not have sufficient sensitivity to probe the binding of low-molecular-weight ***-optical devices such as field-effect transistors can be more sensitive but do not offer some of the significant features of optical devices,particularly molecular *** present optical conductivity-based mid-infrared(mid-IR)biosensors that allow for sensitive and quantitative measurements of low-molecular-weight analytes as well as the enhancement of spectral *** sensors employ a hybrid metasurface consisting of monolayer graphene and metallic nano-antennas and combine individual advantages of plasmonic,electronic and spectroscopic ***,the hybrid metasurface sensors can optically detect target molecule-induced carrier doping to graphene,allowing highly sensitive detection of low-molecular-weight analytes despite their small ***,the resonance shifts caused by changes in graphene optical conductivity is a well-defined function of graphene carrier density,thereby allowing for quantification of the binding of ***,the sensor performance is highly stable and consistent thanks to its insensitivity to graphene carrier mobility ***,the sensors can also act as substrates for surfaceenhanced infrared *** demonstrated the measurement of monolayers of sub-nanometer-sized molecules or particles and affinity binding-based quantitative detection of glucose down to 200 pM(36 pg/mL).We also demonstrated enhanced fingerprinting of minute quantities of glucose and polymer molecules.

关键词： conductivity surface Optical

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

一种应用关联规则森林的改进贝叶斯分类算法

西安交通大学学报 2009年第2期43卷 48-52页

作者：吴宁柏春霞祝毅博西安交通大学电子与信息工程学院西安710049

针对朴素贝叶斯分类方法中属性值条件独立假设不适应实际情况的问题,提出了关联规则森林表示法及应用关联规则森林的改进贝叶斯分类算法(ABC算法).ABC算法利用关联规则挖掘得到满足条件的关联规则,并由此来构造关联规则森林,而规则森林... 详细信息

针对朴素贝叶斯分类方法中属性值条件独立假设不适应实际情况的问题,提出了关联规则森林表示法及应用关联规则森林的改进贝叶斯分类算法(ABC算法).ABC算法利用关联规则挖掘得到满足条件的关联规则,并由此来构造关联规则森林,而规则森林中所有根节点的概率与所有适用的规则置信度连乘,就得到所有属性值的联合概率.应用UDI数据集对分类器进行了测试,分类结果表明,ABC算法的分类准确率明显高于朴素贝叶斯分类算法,平均提高5%,特别是对属性间有着较强依赖关系的数据集,其分类准确率提高了37%.

关键词：朴素贝叶斯分类关联规则联合概率

在线全文

学校读者我要写书评

暂无评论

一种用户频繁移动模式并行挖掘算法

中国科学技术大学学报 2018年第1期48卷 57-64页

作者：朱一波鲍培明吉根林南京师范大学计算机科学与技术学院江苏南京210046

针对用户的日常移动轨迹进行挖掘,可以有效地发现隐藏在用户生活中频繁出现的移动规律,即用户频繁移动模式,提出了一种基于PrefixSpan算法的用户频繁移动模式并行挖掘算法PASFORM.该算法利用了新的剪枝策略,缩小了搜索空间;引入了时间约... 详细信息

针对用户的日常移动轨迹进行挖掘,可以有效地发现隐藏在用户生活中频繁出现的移动规律,即用户频繁移动模式,提出了一种基于PrefixSpan算法的用户频繁移动模式并行挖掘算法PASFORM.该算法利用了新的剪枝策略,缩小了搜索空间;引入了时间约束,挖掘出的频繁移动模式带有时间属性;使用前缀树存储频繁移动模式,缩小了存储空间;采用了并行化方法,适用于海量时空数据的挖掘.实验结果表明,该方法能够快速有效地挖掘出用户频繁移动模式.

关键词：频繁移动模式挖掘序列模式挖掘前缀树并行化

在线全文

学校读者我要写书评

暂无评论

高温瞬时α化大米蛋白质酶促水解性能的测定

食品与发酵工业 2007年第8期33卷 78-81页

作者：朱益波张建华常熟理工学院生物与食品工程系江苏常熟215500 江南大学生物工程学院江苏无锡214036

经单因素和正交实验优化,高温瞬时α化大米的蛋白质酶促水解条件为:pH3.0,温度30℃,液固质量比为15.水解时间3 h,加酶量为2.0 SAPU/g(米粉)。在该水解条件下测定不同处理条件下大米的酶促水解α氨基氮含量,揭示了其在高温瞬时α化过程... 详细信息

经单因素和正交实验优化,高温瞬时α化大米的蛋白质酶促水解条件为:pH3.0,温度30℃,液固质量比为15.水解时间3 h,加酶量为2.0 SAPU/g(米粉)。在该水解条件下测定不同处理条件下大米的酶促水解α氨基氮含量,揭示了其在高温瞬时α化过程中的变化规律,在一定程度上可用于指导生产。

关键词： a-氨基氮高温瞬时a化酶促水解