检索结果-南通市图书馆

Rare Metals 2010年第3期29卷 302-307页

作者： li Mini YU haiping li Chunfeng School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

The effects of temperature （0-500°C） on the compressive strength,hardness,average relative density,and microstructure of Ti6Al4V powder green compacts prepared by magnetic pulse compaction were *** results show that with increasing heating temperature,the compressive strength first increases and then decreases with the maximum value of 976.74 MPa at 400°*** average relative density and hardness constantly increase,and their values reach 96.11% and HRA 69.8 at 500°C,*** increase of partial welding is found among the junctions of particles inside the compacts; there is no obvious grain growth inside the compacts within the temperature range.

关键词： powder metallurgy powder compaction magnetic pulse compaction heating temperature relative density electromagnetic forming

Colloidal Gold Immunochromatographic Assay for Rapid On-Site Detection of Tetracycline in Seawater

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2023年第4期22卷 1129-1138页

作者： li haiping MENG Fanping li Aifeng Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China

Recently increasing concerns from the scientists and public have been paid for seawater pollution due to tetracycline(TC)overuse in maricultural ***,there are few methods or instruments that can be used for specific and rapid detection of this antibiotic in *** this study,the colloidal gold immunochromatographic assay(CG-ICA)was used to achieve this goal.A commercialized monoclonal antibody against TC(anti-TC mAb)was selected because of its higher sensitivity(half-maximal inhibitory concentration of 2.38μgL^(-1)).The prepared CG particles(average diameter of 20 nm)were used to label anti-TC mAb at pH *** conjugate pad was formed by spraying the CG-labeled anti-TC mAb on a glass fibre membrane followed by proper *** test pad was made by immobilizing artificial antigen and anti-mouse mAb in the test line and the control line,respectively,in a nitrocellulose *** test strip,assembled with sample pad,conjugate pad,test pad and absorbent pad,could be used to detect TC during seawater sample flowing through these components in *** results could be observed by the naked eye in *** visible limit of detection(vLOD)was 20μgL^(-1) for TC in *** CG-ICA test results were in good agreement with those of liquid chromatography-tandem mass spectrometry(LC-MS/MS).The assay also showed that,oxytetracycline(OTC)and chlortetracycline(CTC),as the structural analogues of TC,did not interfere with TC ***,the TC concentration given by test strip could not be affected by the fluctuation of temperature(10℃–30℃),pH(7–9)and salinity(0–40)of ***,CG-ICA is a suitable tool for rapid,on-site,and semi-quantitative detection of TC in seawater.

关键词： tetracycline(TC) seawater colloidal gold(CG) immunochromatographic assay semi-quantitative

Numerical Simulation of Magnetic Pressure in Tube-electromagnetic Bulging with Die

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2003年第z1期19卷 129-132页

作者： Hongwei JIANG Chunfeng li haiping YU Zhiheng ZHAO School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Calculation of magnetic pressure is the basis of application of electromagnetic forming (EMF). This paper carries out a numerical simulation of magnetic pressure under the influence of die by means of finite element method. The analysis model of electromagnetic bulging with die is created by using ANSYS, and the distribution of magnetic pressure acting on the tube and the die is obtained. The differences between EMF and other technologies and the effect of die on tube formability are analyzed. The die has important influence upon the calculation accuracy. The simulating conclusions with different discharge energy and current frequency are verified through the technologic tests. The distribution of magnetic pressure acting on the tube agrees well with the measurements of the deformed tube.

关键词： Electromagnetic bulging, Numerical simulation, Magnetic pressure, Deformation

Study on Removing Trace Olefins in Aromatic Hydrocarbons with HPMo-loaded Y Zeolites

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

China Petroleum Processing & Petrochemical Technology 2008年第3期10卷 7-11页

作者： Jiang Zhenghong Zeng haiping Shi li Research Center of Petroleum Processing East China University of Science and Technology Shanghai 200237

HPMo-loaded Y-zeolites were prepared for the removal of trace olefins from aromatic hydrocarbons. The temperature of calcination and the proportion of phospho-molybdic acid in the catalyst were studied. The catalytic activity for olefins removal and the service life of the catalyst were tested in a fixed bed microreactor. The results showed that the catalyst containing 3% phospho-molybdic acid, which was calcined at 550℃, demonstrated the best activity for olefins removal. The catalyst could be regenerated and could perform still very well. Catalyst characterization was performed by XRD and measured by pyridine-FTIR spectrometry. The test results indicated that the activity of the catalyst was related with the effect of acid concentration and acid strength. Besides, the deactivation of the catalyst was associated with the formation of coke deposits and the deactivated catalyst could recover its activity by oxidation with air under a proper temperature.

关键词： aromatics olefins Y-zeolite phospho-molybdic acid alkylation

Effects of inorganic nutrients and environmental factors on the removal of n-propylbenzene and isopropylbenzene in seawater by cryptophytes Rhinomonas reticulata S6A

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2024年第4期42卷 1200-1215页

作者： Jiali CUI Shuhao DU Yumei li haiping li Ping ZHANG Fanping MENG Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China

To effectively remove n-propylbenzene(n-PBZ)and isopropylbenzene(i-PBZ)leaked into seawater using Rhinomonas reticulata S6A(a newly isolated marine microalga),the effects of three inorganic nutrients and four environmental factors on their degradation were determined after 7 d of *** show that NaNO_(3) at 300 mg/L caused a higher removal efficiency of both n-PBZ and i-PBZ(44.79%and 39.26%),while for NaH_(2) PO_(4)·H_(2) O,greater removal rates of two PBZs(47.30%and 42.23%)were achieved at 30 and 20 mg/L,***_(3) supplementation(500-750 mg/L)resulted in a large reduction(43.67%-45.04%)in i-PBZ *** change in seawater pH(from 6 to 9)did not affect the elimination of n-PBZ and *** most suitable salinity and temperature were 30 and 25-30℃,respectively,leading to the PBZs removal of~40%.light intensity exhibited significant influence on elimination of PBZs,and the maximum removal efficiencies of 56.07%(n-PBZ)and 55.00%(i-PBZ)were recorded under 200 and 600μmol/(m^(2)·s),*** addition,the microalga could still remove PBZs when it failed to grow well due to darkness,strong light,low temperature,or low salinity,which might mean that good growth of alga is not always a necessary condition for PBZs ***,attention should be paid to the suitability of nutrient levels and environmental conditions(excluding pH)in seawater when using microalgae for bioremediating PBZs-contaminated seawater.

关键词： propylbenzene(PBZ) Rhinomonas reticulata seawater inorganic nutrient environmental factor

Disruption of chemotaxis-related genes affects multiple cellular processes and the virulence of pathogenic Vibrio harveyi

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2013年第8期32卷 55-60页

作者： QIN Yingxue YAN Qingpi SU Yongquan li haiping ZOU Wenzheng Key Laboratory of Healthy Mariculture for the East China Sea Ministry of Agriculture Jimei University Fisheries College Jimei University College of Ocean and Earth Science Xiamen University

Chemotactic motility is involved in the virulence of many pathogenic bacteria. In order to understand the role of chemotactic motility of Vibrio harveyi in cellular processes and virulence, mini-TnlO/Kan transposon-induced mutants with deficient chemotactic motility were constructed, screened, and iden- tified. Sequence analysis revealed that the 465-bp fragment （GenBank accession number HM630274） fank- ing the transposon insertion site in mutant TS-CM1 had the highest identity （96.9%） with a hypothetical protein gene of V. harveyiATCC BAA-1116 and the second-highest identity （91.8%） with the pgk gene of V. parahaemolyticus RIMD 2210633. In another mutant, TS-CM2, 356 bp of transposon-flanking sequence （GenBank accession number HM630275） also showed the highest identity （94.6%） with a hypothetical pro- tein gene of V. harveyi ATCC BAA-1116 and the second-highest identity （92.4%） with the flaB gene of V. alginolyticus HY9901. Studies on virulence-related biological characteristics such as growth, motility, adhe- sion, and infectivity of the mutants showed that disruption of either the flagellin gene or energy metabolism gene led to subsequent loss of chemotactic motility and changes in growth, motility, adhesion, and viru- lence of the pathogenic E harueyi. Hence, the flagellin gene and crucial energy metabolism gene played an important role in the chemotactic motility of V. harveyi.

关键词： chemotactic motility Vibrio harveyi transposon virulence

Screening of stable internal reference genes by quantitative real-time PCR in humpback grouper Cromileptes altivelis

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2021年第5期39卷 1985-1999页

作者： Xiaojuan CHEN Yun SUN Panpan ZHANG Jianlong li haiping li Caoying WEI Zhenjie CAO Yongcan ZHOU State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikou 570228China Key Laboratory of Tropical Hydrobiology and Biotechnology of Hainan Province Haikou 570228China Department of Aquaculture College of Marine SciencesHainan UniversityHaikou 570228China

Humpback grouper Cromileptes altivelis is one commercial fish with considerable economic *** determine the expression stabilities of six commonly used internal reference genes in *** challenged by Vibrio harveyi and viral nervous necrosis virus(VNNV)through quantitative real-time PCR(qRT-PCR),the expression levels of selected genes in five immune organs stimulated with pathogenic infection were carefully evaluated using algorithms of geNorm,NormFinder,and *** results show that the expre ssion stabilities of the six candidate inte rnal reference genes were diffe re *** no rmal physiological conditions,RPL13 were identified as the most stably expressed genes among five different immune organs(liver,spleen,kidney,intestine,and gill).After *** stimulation,RPL13,RPL13,EF1 A,RPL13,and EF1 A were identified by geNorm,NormFinder,and BestKeeper as the most stable genes in liver,spleen,kidney,intestine,and gill,*** these three algorithms suggested that under stimulation of VNNV,RPL13,EF1 A,Actin,RPL13,and Actin were as the most stable genes in liver,spleen,kidney,intestine,and gill,*** results suggest that specific experiment conditions and tissue types shall be considered when selecting the reference genes in qRT-PCR *** study provided a solid foundation for future studies on gene expression of *** under different conditions.

关键词： Cromileptes altivelis reference gene expression stability pathogenic infection

A method for reducing thermal injury during the ureteroscopic holmium laser lithotripsy

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Urology 2023年第1期10卷 89-95页

作者： Xiaoliang Zhu Feiping li Xixi Hu haiping li Songjiang Wu Haihong Jiang Department of Urology and Andrology Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical UniversityTaizhouChina Department of Urology and Andrology The First Affiliated Hospital of Wenzhou Medical UniversityWenzhouChina

Objective:Many studies have demonstrated the heat effect from the holmium laser lithotripsy can cause persistent thermal injury to the *** purpose of this study was to elucidate the use of a modified ureteral catheter with appropriate firing and irrigation to reduce the thermal injury to the“ureter”during the ureteroscopic holmium laser lithotripsy in ***:An in vitro lithotripsy was performed using a modified catheter(5 Fr)as the entrance for the irrigation and the holmium laser fiber while using the remaining space in the ureteroscopic channel as an *** laser power settings(10 W,20 W,and 30 W)with various firing times(3 s,5 s,and 10 s)and rates of irrigation(15 mL/min,20 mL/min,and 30 mL/min)were applied in the *** changes in the“ureter”were recorded with a thermometer during and after the ***:During the lithotripsy,the local highest mean temperature was 60.3℃ and the lowest mean temperature was 26.7℃.When the power was set to 10 w,the temperature was maintained below 43℃ regardless of laser firing time or irrigation *** of the power or firing time selected,the temperature was below 43℃ at the rate of 30 mL/*** was a significant difference in temperature decrease when continuous 3 s drainage after continuous firing(3 s,5 s,or 10 s)compared to with not drainage(p<0.05)except for two conditions of 0.5 J×20 Hz,30 mL/min,firing 5 s,and 1.0 J×10 Hz,30 mL/min,firing 5 ***:Our modified catheter with timely drainage reducing hot irrigation may significantly reduce the local thermal injury effect,especially along with the special interrupted-time firing setting during the simulated holmium laser procedure.

关键词： Modified catheter Holmium laser lithotripsy Thermal injury

Differences between Chinese and American University Education from the Perspective of Curriculum Design--Taking the University of Minnesota as an Example

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 Contemporary Educational Research 2021年第4期5卷 44-49页

作者： haiping li Beijing Institute of Petrochemical Technology Beijing 102617China

More and more educational researchers pay attention to the differences between China and the United *** the educational concepts of China and the United States respect"student-centered",and are very close in educational system and institutional setting,they are still similar in curriculum *** the University of Minnesota Twin Cities as an example,this paper makes a detailed comparative analysis from the four aspects of curriculum objectives,curriculum assessment,teaching activities and syllabus,finds out the essential differences between Chinese and American university curriculum design,and puts forward that the change of Chinese university curriculum design concept needs to start from basic education,and the cultivation of teachers'thinking and ability is the key influence of the reform factor.

关键词： Differences in education between China and the United States Curriculum objectives Course assessment Teaching activities Teaching program

Polypeptide dendrimers: Self-assembly and drug delivery

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

Science China Chemistry 2011年第2期54卷 326-333页

作者： XU XiangHui li CaiXia li haiping liU Rong JIANG Chao WU Yao HE Bin GU ZhongWei National Engineering Research Center for Biomaterials Sichuan University Chengdu 610064 China

Amphiphilic dendritic poly（glutarnic acid）-b-polyphenylalanine copolymers were synthesized using generation 3 dendritic poly（glutamic acid） as the macroinitiator in the ring-opening polymerization of NCA-Phe. The block copolymers self-assembled micelles with polyphenylalanine segments as core and dendritic poly（glutamic acid） segments as shell. The biocompatibility of the micelles was studied. The release of the anticancer drug doxorubicin from the micelles was investigated in vitro. The results showed that the sustaining release of the drug could last for 60 h. The micellar drug release system was efficient in inhibiting the proliferation of HepG2 liver cancer cells, 75% cancer cells were killed under appropriate in vitro incubation.

关键词： serf-assembly dendritic polypeptide block copolymer drug delivery

同方期刊数据库