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~1H驰豫时间谱在水泥基材料研究中的应用

硅酸盐通报 2018年第3期37卷 888-893页

作者：曹天露邹定华冯春花李昆河南理工大学材料科学与工程学院焦作454000

水泥水化、硬化体结构的形成及演化、水泥基材料内部不同水分之间的转化、吸水、干燥、水分在水泥基材料内部的扩散过程引起水分化学状态或所处环境物理状态的变化。这种变化可用~1H核磁共振驰豫时间进行表征。已有的研究表明,~1H驰豫... 详细信息

水泥水化、硬化体结构的形成及演化、水泥基材料内部不同水分之间的转化、吸水、干燥、水分在水泥基材料内部的扩散过程引起水分化学状态或所处环境物理状态的变化。这种变化可用~1H核磁共振驰豫时间进行表征。已有的研究表明,~1H驰豫时间谱可用于水泥水化过程、硬化体结构形成、孔结构、水分在水泥基材料内的传输过程等的表征,所得结果与其它方法所得结果有较好的一致性。且磁共振成像可直接观察水分在水泥基材料中的分布及传输,这是其它现代测试方法难以达到的。

关键词：核磁共振水泥基材料驰豫时间磁共振成像水化孔结构

Multiplexed imaging detection of live cell intracellular changes in early apoptosis with aggregation-induced emission fluorogens

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Science China Chemistry 2018年第8期61卷 892-897页

作者： Yabin zhou Haixiang Liu na zhao zhiming Wang Michael z.Michael Ni Xie Ben zhong Tang Youhong Tang Faculty of Biological Engineering Sichuan University of Science and Engineering Department of Chemistry the Hong Kong University of Science and Technology Centre for nano Scale Science and Technology College of Science and Engineering Flinders University Department of Gastroenterology and Hepatology Flinders Centre for Innovation in Cancer Flinders University AIEgen Biotech Co. Limited

Apoptosis is an important process for maintaining tissue homeostasis and eliminating abnormal cells in multicellular *** in apoptosis often leads to severe diseases such as cancers. Better understanding of its mechanisms and processes is therefore important. Accompanying molecular biology events of apoptosis is a series of cellular morphology changes: nucleus condensation, cell shrinkage and rounding, cell surface blebbing, dynamic blebbing, apoptotic membrane protrusions and nucleus fragmentations and finally, the formation and release of apoptotic bodies. It is difficult to detect cellular changes in the early phase of apoptosis due to the subtle changes at this phase. In the current study, we induced apoptosis in He La cells with H2 O2 and used nuclear dye Hoechst 33258, mitochondria, lysosome and cytoplasmic protein specific aggregation-induced emission fluorogens(AIEgens), TPE-Ph-In, 2 M-DABS and BSPOTPE to successfully perform live cell multiplexed imaging to investigate early apoptosis cellular events. We showed the gradual dissipation of mitochondria membrane potential until it is nondetectable by TPE-Ph-In. Increased mitophagy detected by TPE-Ph-In and 2 M-DABS, condensed nucleus detected by Hoechst33258, increased permeability and/or reduced integrity of nuclear membrane, and increased intracellular vesicles detected by2 M-DABS are some of the early events of apoptosis.

关键词： apoptosis multiplexed imaging He La aggregation-induced emission fluorogens(AIEgens)

Solar PV-Battery-Electric Grid-Based Energy System for Residential Applications: System Configuration and Viability

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Research 2019年第1期2019卷 486-502页

作者： V.Bagalini B.Y.zhao R.z.Wang u.Desideri university of Pisa DESTEC Largo Lucio LazzarinoPisa 56122Italy Institute of Refrigeration and Cryogenics Shanghai Jiao Tong UniversityShanghai 200240China

Distributed renewable energy share increase in electricity generation is creating challenges for the whole power system,due to its intermittent and nonprogrammable *** storage has the potential to solve those issues although its technical,economic,and environmental impact is up for *** paper presents a study about a PV-battery energy storage system installed in a gridconnected residential apartment in the Green Energy Laboratory at Shanghai Jiao Tong university,*** experimental results show how the presence of energy storage reduces the midday feed-in of excess PV power and the evening peak demand,providing benefits to the distribution network in terms of reduced voltage swings and peak *** the Chinese context,an economic analysis is carried out to assess the profitability of residential PV-battery systems,using the net present value as the economic indicator of an 18-year investment in which the battery pack is replaced twice(6 life years).The analysis shows that such system is not economically viable due to a combination of low electricity prices,valuable PV incentives,and high technology ***,considering a future scenario of doubled electricity tariff,halved export tariff,and falling technology costs(-66%battery and-17%PV and inverter),PV-battery investment becomes profitable and shows more resilience to future scenarios than PV-only investment.

关键词： battery Battery Solar

LONGITuDInaL DISPERSION IN SEDIMENT-LADEN OPEN CHANNEL FLOWS

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International Journal of Sediment Research 2004年第1期19卷 1-14页

作者： z.AHMAD,u.C.KOTHYARI,K.G.RANGA RAJu Asst.Professor of Civil Engineering Indian Inst.of Tech. Roorkee(Formerly university of Roorkee) ROORKEE-247 667 INDIA Professor of Civil Engineering Indian Inst. of Tech. Roorkee ROORKEE-247 667 INDIA. Professor of Civil Engineering Indian Inst. of Tech. Roorkee ROORKEE-247 667 INDIA.

Laboratory experiments on longitudinal dispersion in clear-water and sediment-laden open channel flows are reported. Data from these experiments and those available from previous studies indicate that the suspended sediment present in the flow affects the longitudinal dispersion process. The observed velocity distributions over the depth of sediment-laden flows indicate that the velocity deviates from the mean velocity more in sediment-laden flows than in clear-water flows. The velocity distributions over the cross section and secondary flow in the channel are also expected to be altered due to the presence of suspended sediments in the flow. For these reasons, more dispersion is found in sediment-laden flows than in corresponding clear-water flows. A predictor for the dispersion coefficient in sediment-laden flows is proposed.

关键词： Longitudinal dispersion Open channel Sediment-laden flow Pollutants Velocity distribution

Titanium diboride-metals gradient materials prepared by field activated diffusion bonding process

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China Welding 2009年第4期18卷 10-14页

作者：陈少平张楠孟庆森 u．Cosan z．A．Munir Department of Material Science and Engineering Taiyuan University of TechnologyTaiyuan 030024. Department of Chemical Engineering and Materials Science University of California DavisCA 59616 USA.

Functionally gradient samples are prepared by getting metal Ni or Cu bonded with Ni-matrix composites reinforced by TiB2 particles by field activated diffusion bonding process. The intermetallic compound of Ni3Al has been applied as a mediate layer in order to reduce residual stress. The microstracture, phase composition of the interfaces between the metal and Ni3Al are determined and the mechanical properties of the gradient materials are characterized. Elemental concentration profiles across the interfaces between layers showed significant diffusion dissolution and formation of firm bonds. Measured micro-hardness values of the sample increased monotonically from the metal substrate to the surface layer of composites. The values for the surface composite layer ranged from about 2 000 HK to 3 300 HK. The results of this investigation demonstrate the feasibility of field activated diffusion bonding process for rapid preparation of FGMs.

关键词： electric field functionally gradient materials TiB2 Ni3Al diffusion bonding

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Party女王百变珠宝

中国宝石 2012年第11期21卷 44-53页

作者： z0na 郭亮(摄影)

2012年年末如期而至，各种派对也疯狂袭来：恋人的甜蜜约会，亲朋好友的聚会，职场的酒会，好朋友的狂欢，为了在各种派对上出彩，你是不是花足了血本？妆容精致，华服加身，这时，可干万别忘记挑选一件珠宝，它可是你派对造型中最画龙... 详细信息

2012年年末如期而至，各种派对也疯狂袭来：恋人的甜蜜约会，亲朋好友的聚会，职场的酒会，好朋友的狂欢，为了在各种派对上出彩，你是不是花足了血本？妆容精致，华服加身，这时，可干万别忘记挑选一件珠宝，它可是你派对造型中最画龙点睛的那一笔。

关键词：珠宝甜蜜酒会妆容华服

Prevalence of plasmid mediated bla_(TEM-1) and bla_(CTX-M-15) type extended spectrum beta-lactamases in patients with sepsis

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Asian Pacific Journal of Tropical Medicine 2012年第2期5卷 98-102页

作者： Shahzad F Haque Saeedut-z Ali Mohammed TP Asad u Khan Department of Medicine J.N.Medical CollegeAligarhIndia Interdisciplinary Biotechnology unit AMUAligarh Muslim UniversityAligarhIndia Department of Medicine J.N.Medical College.AligarhIndia

Objective:To characterize the bacterial pathogens in patients having gram negative septicaemia. Further,to evaluate the antimicrobial resistance and underlying molecular mechanisms in these ***:A total number of 70 cases of gram negative sepsis were included in this prospective,open labeled,observational *** methods for isolation and identification of bacteria were *** susceptibility and ESBL testing was performed by the standard disc diffusion *** amplification was performed to identify blaub>CTX-Mub>,blaub>SHVub>and blaub>TEMub> type *** experiments were performed to show resistant marker transfer. Results:The most prevalent isolates Escherichia coli（***） 58.6%,Klebsiella Spp.32.9%and Pseudomonas 8.6%,were resistant to most of the antimicrobials including cefazolin,ceftriaxone, cefuroxime,ampicillin and co-trimoxazole but sensitive to imipenem and *** and MBL production was seen 7.3%and 12.2%of *** isolates *** isoaltes were found to have blaub>CTX-M-15ub> and two of them also showed blaub>TEM-1ub> type ***, none of them showed blaub>SHVub>.Conjugation experiments using J-53 cells confirmed these resistant markers as plasmid ***:This work highlights the molecular epidemiology of escalating antimicrobial resistance and likely switch over of blaub>CTX-M-15ub> type extended spectrum beta-lactamases by blaub>TEMub> type ESBLs in ***,the antimicrobial resistance by horizontal gene transfer was predominant among Enterobacteraceae in the community setting.

关键词： Gram negative sepsis ESBL Antimicrobial resistance

Annual and seasonal changes of the air temperature with altitude in the upper Dades valley, High Atlas, Morocco

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Journal of Mountain Science 2022年第1期19卷 85-102页

作者： ŻMuDzKA Elwira DŁuŻEWSKI Maciej DĄBSKI Maciej LEzIAK Kamil ROJAN Elżbieta Department of Climatology Faculty of Geography and Regional StudiesUniversity of WarsawKrakowskie Przedmieście 3000-927 WarsawPoland Department of Geomorphology Faculty of Geography and Regional StudiesUniversity of WarsawKrakowskie Przedmieście 3000-927 WarsawPoland

The purpose of this study is to determine the size of air temperature changes with altitude in the mountains of the arid zone, on the example of the upper Dades valley(High Atlas, Morocco). The air temperature change with altitude was determined on the basis of 5 years data from three meteorological stations. The analysis was carried out on an annual and seasonal basis. The annual and daily variations of thermal gradients between pairs of stations were also determined. It was found that the average thermal gradient in the upper Dades valley was-1.02℃ per 100 m. The highest values of the thermal gradient occur in winter and the lowest in summer. In winter,the thermal gradient was characterized by the greatest variability. Minima of the daily variation of air temperature gradients were observed in early morning hours and maxima around midday. In the lower part of the valley, air temperature inversion frequently developed between 10 AM and 3 PM *** obtained results show high thermal gradients in the mountains of the arid zone, with their annual amplitude increasing in the lower parts of the *** instantaneous values of the gradients were significantly modified by the supply of latent heat and the occurrence of dust storms. It has been shown that the advection factor plays an important role in shaping large gradient values. The study contains novel results of thermal gradient measurements in high mountains of arid zone.

关键词： Air temperature gradient Thermal inversion Annual and seasonal variability Synoptic situation High mountains of arid zone High Atlas Mountains

Wavelet analysis of stagnation point flow of non-Newtonian nanofluid

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Applied Mathematics and Mechanics(English Edition) 2019年第8期40卷 1211-1226页

作者： M.HAMID M.uSMAN R.u.HAQ4 z.H.KHAN Wei WANG School of Mathematical Sciences Peking UniversityBeijing 100871China BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering SciencePeking UniversityBeijing 100871China Department of Electrical Engineering Bahria UniversityIslamabad 44000Pakistan State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource & HydropowerSichuan UniversityChengdu 610065China Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education Tsinghua UniversityBeijing 100084China

The wavelet approach is introduced to study the influence of the natural convection stagnation point flow of the Williamson fluid in the presence of thermophysical and Brownian motion effects. The thermal radiation effects are considered along a permeable stretching surface. The nonlinear problem is simulated numerically by using a novel algorithm based upon the Chebyshev wavelets. It is noticed that the velocity of the Williamson fluid increases for assisting flow cases while decreases for opposing flow cases when the unsteadiness and suction parameters increase, and the magnetic effect on the velocity increases for opposing flow cases while decreases for assisting flow cases. When the thermal radiation parameter, the Dufour number, and Williamson’s fluid parameter increase, the temperature increases for both assisting and opposing flow cases. Meanwhile, the temperature decreases when the Prandtl number increases. The concentration decreases when the Soret parameter increases, while increases when the Schmidt number increases. It is perceived that the assisting force decreases more than the opposing force. The findings endorse the credibility of the proposed algorithm, and could be extended to other nonlinear problems with complex nature.

关键词： Williamson nanofluid heat and mass transfer stagnation point flow assisting and opposing flow Chebyshev wavelet method