检索结果-南通市图书馆

Exploiting Internal Parallelism of SSD for Hash Join

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 Electronics 2019年第5期28卷 889-898页

作者： YANG Lianghuai zhang ting FAN Yulei GONG Weihua YU Jian School of Computer Science and Technology Zhejiang University of Technology School of Computing and Mathematical Sciences Auckland University of Technology

By regarding a Solid-state drive(SSD) as a black box and observing its external behavior instead of peeping into its internal details, we investigate how the factors of I/O granularity and I/O queue depth influence the throughput of an SSD through a series of experiments and relate to the internal parallelism of an SSD, and then propose the concept of Combination equivalence class(CEC) as the set of combination pairs of these two factors.A novel buffer allocation scheme for hash join over SSDs is invented by taking both factors into account. Extensive experiments demonstrate the effectiveness of our scheme.

关键词： Hash join Internal parallelism I/O granularity Queue depth Solid state drive

Heterologous expression and characterization of two chitinase 5 enzymes from the migratory locust Locusta migratoria

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2016年第3期23卷 406-416页

作者： Ying-Long Li Hui-Fang Song Xue-Yao zhang Da-Qi Li ting-ting zhang En-Bo Ma Jian-Zhen zhang Research Institute of Applied Biology College of Life Science Shanxi University Taiyuan China

Insect chitinases are involved in degradation of chitin from the exoskeleton or peritrophic metrix ofmidgut. In Locusta migratoria, two duplicated Cht5s （LmCht5-1 and LmCht5-2） have been shown to have distinct molecular characteristics and biological roles. To explore the protein properties of the two LmCht5s, we heterologously expressed both enzymes using baculovirus expression system in SF9 cells, and characterized kinetic and carbohydrate-binding properties of purified enzymes. LmCht5-1 and LmCht5-2 exhibited similar pH and temperature optimums. LmCht5-1 has lower Km value for the oligomeric substrate （4MU-（GlcNAe）3）, and higher Km value for the longer substrate （CM-Chitin- RBV） compared with LmCht5-2. A comparison of amino acids and homology modeling of catalytic domain presented similar TIM barrel structures and differentiated amino acids between two proteins. LmCht5-1 has a chitin-binding domain （CBD） tightly bound to colloidal chitin, but LmCht5-2 does not have a CBD for binding to colloidal chitin. Our results suggested both LmCht5- I and LmCht5-2, which have the critical glutamate residue in region II of catalytic domain, exhibited chitinolytic activity cleaving both polymeric and oligomeric substrates. LmCht5-1 had relatively higher activity against the oligomeric substrate, 4MU-（GlcNAc）3, whereas LmCht5-2 exhibited higher activity toward the longer substrate, CM-Chitin-RBE These findings are helpful for further research to clarit}g their different roles in insect growth and development.

关键词： chitinase 5 enzyme kinetics heterologous expression Locusta migratoria

Extraction of vanadium from vanadium slag by high pressure oxidative acid leaching

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2015年第1期22卷 21-26页

作者： Guo-quan zhang ting-an zhang Guo-zhi Lü Ying zhang Yan Liu Zhuo-lin Liu Key Laboratory of Ecological Utilization of Multi-Metal Intergrown Ores of the Ministry of Education School of Materials and MetallurgyNortheastern University

To extract vanadium in an environment friendly manner, this study focuses on the process of leaching vanadium from vanadium slag by high pressure oxidative acid leaching. Characterizations of the raw slag, mineralogy transformation, and the form of leach residues were made by X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The result shows that the vana-dium slag is composed of major phases of fayalite, titanomagnetite, and spinel. During the high pressure oxidative acid leaching process, the fayalite and spinel phases are gradually decomposed by sulfuric acid, causing the release of vanadium and iron in the solution. Meanwhile, unreacted silicon and titanium are enriched in the leach residues. With the initial concentration of sulfuric acid at 250 g·L^-1, a leaching tem-perature of 140℃, a leaching time of 50 min, a liquid-solid ratio of 10：1 mL·g^-1, and oxygen pressure at 0.2 MPa, the leaching rate of vana-dium reaches 97.69%.

关键词： extraction vanadium slag pressure leaching sulfuric acid mineralogy

One year results of presbyLASIK using hybrid bi-aspheric micro-monovision ablation profile in correction of presbyopia and myopic astigmatism

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2020年第2期13卷 271-277页

作者： Fang Liu ting zhang Quan Liu State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CentreSun Yat-sen UniversityGuangzhou 510060Guangdong ProvinceChina

●AIM:To analyze one year clinical outcomes and subjective rating of hybrid bi-aspheric multifocal central presbyLASIK with micro-monovision for correction of presbyopia and myopic astigmatism.●METHODS:Seventy-four eyes of 37 patients consecutively treated with presbyLASIK were *** mean age of the patients was 43.8±3.0 y with a mean spherical equivalent refraction of-5.21±1.87 diopters(D)and mean astigmatism of-0.82±0.64 *** acuity,manifest refraction,contrast sensitivity,aberrometry and patients’subjective rating were evaluated pre-and postoperatively.●RESULTS:At 1 y postoperatively(68 eyes of 34 patients),the mean spherical equivalent(SE)refraction in distance eyes was 0.06±0.05 D,whereas the achieved SE in near eyes was-0.83±0.05 ***-nine percent of eyes were within±0.50 D of target correction of *** binocular mean uncorrected distance visual acuity(UDVA)was 0.00±0.18 logMAR(20/20).Sixty-four percent of patients achieved 0.0 logMAR(20/20)or better of UDVA and 0.1 logRAD or better of UNVA as *** was a binocularly loss of one line CDVA after surgery for only one patient(3%,1/34)and no patient lost 2 *** changes in binocular contrast sensitivity(CS)in all test conditions were not significant at any frequency after *** changes of entire eye total higher order aberrations(tHOA)and spherical aberrations(SA)significantly higher in near eyes than in distance *** overall satisfaction score for surgery was 93±8.●CONCLUSION:The hybrid bi-aspheric multifocal central presby LASIK with micro-monovision appears to be an efficacious option for myopic *** year postoperative outcomes in a relatively young presbyopia population indicate improvements in both far and near vision with high satisfaction.

关键词： presbyLASIK presbyopia monovison myopia

Transcriptome Analysis via RNA Sequencing Reveals the Molecular Mechanisms Underlying the Hedera helix Response to High Temperature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2022年第11期91卷 2403-2417页

作者： ting zhang Ping Li Jiali Wei Shanghai Botanical Garden Shanghai200231China Shanghai Engineering Research Center of Sustainable Plant Innovation Shanghai200231China Shanghai Key Laboratory of Bio-Energy Crops School of Life SciencesShanghai UniversityShanghai200444China

Hedera helix is an evergreen ornamental plant that is resistant to cool but not high temperature and deserves to be further researched for improving its adaptability to heat *** Hedera helix cultivars,heat-tolerant(HT)‘Jessica’and heat-sensitive(HS)‘Shamrock’,were used for differences analyses of *** detected 6179 differentially expressed genes(DEGs)and 5992 DEGs in‘Jessica’and‘Shamrock’to heat stress,*** these,1983 upregulated DEGs and 1400 downregulated DEGs were shared between both varieties,resulting in enhancement of various pathways such as biosynthesis of secondary metabolites,glyoxylate dicarboxylate metabolism,and protein processing in endoplasmic reticulum(PPER),RNA transport,*** the common downregulated DEGs,72 TFs in 25 gene families were found,including members of the MYB and MYBrelated families,the bHLH family,***‘Jessica’(HT),634 unique up-regulated DEGs were identified,including genes associated with phenylpropanoid biosynthesis,starch and sucrose metabolism,biosynthesis of amino *** upregulated TFs of HT were upregulated much more rapidly than those of HS in response to high *** TF-encoding genes were selected to verify the RNA sequencing data by *** study revealed the gene expression patterns of ivy in response to heat stress and the molecular basis of heat tolerance,which provided theoretical references for improving the heat tolerance of ivy.

关键词： Hedera helix RNA-sequencing heat stress heat tolerance transcriptome

Global Solutions of Modified One-Dimensional SchrÖdinger Equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Mathematical Research 2021年第3期37卷 349-385页

作者： ting zhang School of Mathematical Sciences Zhejiang UniversityHangzhou 310027China

In this paper,we consider the modified one-dimensional SchrÖdin-ger equation:(D_(t)-F(D))u=λ|u|^(2)u,where F(ζ)is a second order constant coefficients classical elliptic symbol,and with smooth initial datum of sizeε(<<)*** prove that the solution is global-in-time,combining the vector fields method and a semiclassical analysis method introduced by ***,we get a one term asymptotic expansion for u when t→+∞.

关键词： SchrÖdinger equation semiclassical analysis global solution

Neuroprotective effects of Yiqihuoxue calm wind capsule on ischemic stroke in rats

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 Natural Medicines 2017年第10期15卷 758-765页

作者： zhang Jun-Xia GUO Jiao-Mei LIN Hong-Jun zhang ting-ting LI Zhen-Guo ZHOU Ji-Chun zhang Zhen-Zhong School of Pharmaceutical Science Zhengzhou University Zhengzhou 450001 China Department of Pharmacology Henan Provincial Institute of Food and Drug Control Zhengzhou 450003 China Key Laboratory of Targeting Therapy and Diagnosis for Critical Diseases of Henan Province Zhengzhou 450001 China

Stroke remains the third leading cause of death and of adult disability *** occlusion,followed by ischemic cascade,leads to irreversible tissue *** tissue plasminogen activator is the only FDA approved drug for the current treatment of acute ischemic ***,traditional Chinese medicine has a long history and rich clinical experience in the treatment and rehabilitation of ischemic *** a classical middle cerebral artery occlusion(MCAO)stroke model,we tested the effectiveness of Yiqihuoxue calm wind(YCW)capsule on neurological function,gross pathology and oxidative stress status in MCAO *** capsule(3.36 and 6.72 g·kg^(-1) of crude drug)could significantly lower Longa's score and superoxide dismutase(SOD)level,together with less necrotic cells and infarcted *** addition to elevated MDA and downregulated i NOS expression,YCW capsule exhibited its neuroprotective effects via free radical scavenging and NO inhibition.

关键词： Yiqihuoxue calm wind capsule Ischemic stroke Middle cerebral artery occlusion Oxidative stress Nitric oxide Platelet

Molecular Dynamics Simulations and Experimental Investigations of Atomic Diffusion Behavior at Bonding Interface in an Explosively Welded Al/Mg Alloy Composite Plate

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2017年第10期30卷 983-991页

作者： ting-ting zhang Wen-Xian Wang Jun Zhou Xiao-Qing Cao Rui-Shan Xie Yi Wei College of Materials Science and Engineering Taiyuan University of Technology Shanxi Key Laboratory of Advanced Magnesium-Based Materials Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Department of Mechanical Engineering Pennsylvania State University ErieThe Behrend College Department of Mechanical Engineering Key Laboratory for Advanced Materials Processing TechnologyTsinghua University

In this study, 6061 aluminum alloy and AZ31 B magnesium alloy composite plate was fabricated through explosive welding. Molecular dynamics（MD） simulations were conducted to investigate atomic diffusion behavior at bonding interface in the AI/Mg composite plate. Corresponding experiments were conducted to validate the simulation results. The results show that diffusion coefficient of Mg atom is larger than that of A1 atom and the difference between these two coefficients becomes smaller with increasing collision velocity. The diffusion coefficient was found to depend on collision velocity and angle. It increases linearly with collision velocity when the collision angle is maintained constant at 10° and decreases linearly with collision angle when the collision velocity is maintained constantly at 440 m/s. Based on our MD simulation results and Fick＇s second law, a mathematical formula to calculate the thickness of diffusion layer was proposed and its validity was verified by relevant experiments. Transmission electron microscopy and energy-dispersive system were also used to investigate the atomic diffusion behavior at the bonding interface in the explosively welded 6061/AZ31B composite plate. The results show that there were obvious Al and Mg atom diffusion at the bonding interface,and the diffusion of magnesium atoms from magnesium alloy plate to aluminum alloy plate occurs much faster than the diffusion of aluminum atoms to the magnesium alloy plate. These findings from the current study can help to optimize the explosive welding process.

关键词： Al/Mg composite plate Explosive welding Molecular dynamics simulation Atomic diffusionbehavior

Fructus Zanthoxyli extract improves glycolipid metabolism disorder of type 2 diabetes mellitus via activation of AMPK/PI3K/Akt pathway:Network pharmacology and experimental validation

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Medicine 2022年第6期20卷 543-560页

作者： ting zhang Qing zhang Wei Zheng ting Tao Ruo-lan Li Li-yu Wang Wei Peng Chun-jie Wu School of Pharmacy Chengdu University of Traditional Chinese MedicineChengdu 611137Sichuan ProvinceChina

Objective:This study investigated the potential mechanisms behind the beneficial effects of Fructus Zanthoxyli(FZ)against type 2 diabetes mellitus(T2DM)based on network pharmacology and experimental ***:Ultra-high-performance liquid chromatography coupled with hybrid quadrupole-orbitrap high-resolution mass spectrometry,and gas chromatography-mass spectrometry were used to identify the constituents of ***,the differentially expressed genes linked to the treatment of diabetes with FZ were screened using online databases(including Gene Expression Omnibus database and Swiss Target Prediction online database),and the overlapping genes and their enrichment were analyzed by Kyoto Encyclopedia of Genes and Genomes(KEGG).Finally,the pathway was verified by in vitro experiments,and cell staining with oil red and Nile red showed that the extract of FZ had a therapeutic effect on ***:A total of 43 components were identified from FZ,and 39 differentially expressed overlapping genes were screened as the possible targets of FZ in *** dug component-target network indicated that PPARA,PPARG,PIK3R3,JAK2 and GPR88 might be the core genes targeted by FZ in the treatment of ***,the enrichment analysis of KEGG showed that effects of FZ against T2DM were closely correlated with the adenosine monophosphate-activated protein kinase(AMPK)and phosphatidylinositol-3-kinase(PI3K)/protein kinase B(Akt)signaling *** vitro experiments further confirmed that FZ significantly inhibited palmitic acid-induced lipid formation in Hep G2 ***,FZ treatment was able to promote the AMPK and PI3K/Akt expressions in Hep G2 ***:Network pharmacology combined with experimental validation revealed that FZ extract can improve the glycolipid metabolism disorder of T2DM via activation of the AMPK/PI3K/Akt pathway.

关键词： Fructus Zanthoxyli Zanthoxylum bungeanum Maxim Type 2 diabetes mellitus Network pharmacology Glucose and lipid metabolism Phosphatidylinositol-3-kinase AMPK/PI3K/Akt