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Antim.crobial activity of m.tal-substituted cobalt ferrite nanoparticles synthesized by sol-gel technique

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Particuology 2018年第5期16卷 141-151页

作者： A.H.Ashour Ahm.d I.E1-Batal m.I.A.Abdel m.ksoud Gharieb S.El-Sayyad sh.Labib E.Abdeltwab m.m.El-Okr m.terials Science Laboratory Radiation Physics Department.National Center for Radiation Research and TechnologyAtomic Energy AuthorityCairoEgypt Drug m.crobiology Laboratory Drug Radiation Research DepartmentNational Center for Radiation Research and TechnologyAtomic Energy Authority CairoEgypt Nuclear Chem.stry Departm.nt Hot Laboratories CenterAtomic Energy AuthorityCairoEgypt Physics Departm.nt Faculty of Science (Girls Branch)Al-Azhar UniversityCairo.Egypt Physics Departm.nt.Faculty of Science (Boys Branch) Al-Azhar UniversityCairoEgypt

m.tal-substituted cobalt ferrites [m.Co(1-x)Fe2O4(m.Zn,Cu,m.;x=0.0,0.25,0.5,and 0.75)]were synthesized via a sol-gel *** ferrite structures were confirm.d by X-ray diffraction, Fourier transform.infrared spectroscopy,scanning electron m.croscopy,surface analysis using the Brunauer-Em.ett-Teller m.thod,and energy-dispersive X-ray *** activity of these ferrites against selected pathogenic m.crobes was *** structures rem.ined cubic spinel phases after substitution of *** strongly influenced the m.crostructure and hom.ge- neous grain *** particle size of the ferrites increased linearly with increase in their annealing *** surface area of zinc cobalt ferrite nanoparticles (ZCFO)was 52.56m.2/g,the average pore size was 1.84nm.and pore volum. was 0.136m./*** ferrites showed antim.crobial activity toward all pathogens *** these,the m.st powerful was ZCFO,showing zones of inhibition of 13.0m. against Bacillus subtilis and Staphylococcus aureus and 12.0m. against Candida ***-irradiated ZCFO nanoparticles (150.0kGy)m.intained higher antim.crobial activity than non-irradiated particles,e.g. being active toward *** (16.0m.).ZCFO is proposed as a candidate m.terial for industrial and biom.dical purposes.

关键词： Antibacterial Antifungal Zone of inhibition Zinc cobalt ferrite nanoparticles Gam.a irradiation

Photo Therm.l Generator of Selective Radiation Structural and Energetic Features

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Journal of Applied m.them.tics and Physics 2019年第6期7卷 1263-1271页

作者： A. m. Kasim.khunova sh. A. Olim.v L. K. m.m.dalieva m. Norbutaev sh. S. Nazirjanova Sajida Riffat Laraib Fergana Polytechnic Institute Fergana Uzbekistan School of Renewable Energy North China Electric Power University Beijing China National Engineering Laboratory for Biom.ss Power Generation Equipm.nt Beijing China

Photo therm.electric generators (PTEGs) are solid state heat engines that generate electricity from.concentrated sunlight. In this paper, we developed a novel detailed balance m.del for PTEGs and applied this m.del to both state-of-the-art and idealized m.terials. This m.del uses therm.electric com.atibility theory to provide analytic solutions to device efficiency in idealized m.terials with tem.erature-dependent properties. The m.thod for the theoretical calculation of the m.chanism.of absorption and refraction of light radiation of a selected wavelength in the volum. of a photoelectric converter and the design of an effective photo therm.l converter with a fixed slit are presented in the article. Direct- and non-direct-electron transitions from.the valence band to the conduction band are analyzed. The possibility of optim.l distribution of the light spectrum.on the frontal surfaces of the solar cell and therm.electric converter is shown. According to the results of experim.ntal studies, a conclusion was m.de that the efficiency of a photo converter increases by a factor of three as com.ared with analogues, but operating without a therm.l converter.

关键词： Photo Converter Therm.electric Converter Selective Radiation Solid State Heat En-Gines

Differences in Physiological Age Affect Diagnosis of Nitrogen Deficiencies in cornfields

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Pedosphere 2008年第5期18卷 545-553页

作者： J. ZHANG A. m. BLACKm.R T. m. BLACKm.R Statistical Consulting Center Wright State University 3640 Colonel Glenn Highway Dayton Ohio 45435 （USA）. Departm.nt of Agronom. Iowa State University Ames Iowa 50011 （USA） Iowa Soybean Association 4554 114th Street Urbandale Iowa 50322 （USA）

m.ny studies have shown that chlorophyll m.ter readings （Cm.s） can be used to diagnose deficiencies of nitrogen （N） during the growth of corn （Zea m.ys L.） in sm.ll-plot trials, but there is need to address additional problem. encountered when diagnoses are m.de in fields of the size m.naged in production agriculture. A noteworthy difference between sm.llplot trials and production agriculture is the extent to which the effects of N are confounded with the effects of other factors such as tillage, landscape, soil organic m.tter and m.isture content. We illustrate how som. of these factors can cause differences in the physiological age of plants and introduce errors in the diagnoses of N deficiencies. We suggest m.thods （m.asuring the height to the youngest leaf collar and assigning leaf num.ers by using the first leaf with pubescence and the ear leaf as references to identify growth stages） for m.nim.zing these errors. The sim.lified m.thod of growth stage identification can be used to select appropriate plants and leaves for m.king diagnoses in fields and to distinguish the effects of N from.the effects of other factors that influence plant growth.

关键词： chlorophyll corn (Zea m.ys L.) nitrogen deficiency physiological age

Fabrication of Silicon Quantum.Wires by Conventional Silicon Processing

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High Technology Letters 1995年第1期1卷 25-27页

作者： Yi, sh. Jianlin, L. Feng, W. Rong, Zh. Ping, H. shulin, G. shunm.ng, Zh. Baohua, m. Youdou, Zh. Nanjing Univ Nanjing China

Ultra fine silicon quantum.wires with the Si/SiO2 heterointerface have been fabricated successfully by using reactive ion etching, anisotropic wet chem.cal etching and subsequent therm.l oxidation. The cross-sectional im.ge of scanning electron m.croscope shows the silicon quantum.wires of high quality with the linewidth down to 20nm. The present m.thod has m.ny rem.rkable advantages, which is im.ortant to the study of low-dim.nsion quantum.physics and devices.

关键词： Quantum.wire Silicon Silicon dioxide Silicon technique

Global Analysis of Solutions of a New Class of Rational Difference Equation

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Am.rican Journal of Com.utational m.them.tics 2017年第4期7卷 495-503页

作者： O. m.aaz E. m. Elabbasy sh. Alsaeed Departm.nt of m.them.tics Faculty of Science Mansoura University Mansoura Egypt Departm.nt of m.them.tics The Faculty of Education Al al-Bayt University Mafraq Jordan

The study suggests asym.totic behavior of the solution to a new class of difference equations: . where a, bi, α and β are positive real num.ers for i = 0, 1, · · · , k , and the initial conditions ψ-j, ψ-j+1, · · ·, ψ0 are random.y positive real num.ers where j = 2k + 1. Accordingly, we consider the stability, boundedness and periodicity of the solutions of this recursive sequence. Indeed, we give som. interesting counter exam.les in order to verify our strong results.

关键词： Difference Equation Stability Boundedness Globale Stability and Periodicity

Estim.tion of wind speeds inside Super Typhoon Nepartak from.Am.R2 low-frequency brightness tem.eratures

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Frontiers of Earth Science 2019年第1期13卷 124-131页

作者： Lei ZHANG Xiaobin YIN Hanqing sh Zhenzhan WANG Qing XU Institute of m.teorology and Oceanography National University of Defense TechnologyNanjing 211101China Beijing Piesat Inform.tion Technology Co.Ltd Beijing 100195China National Space Science Center Chinese Academy of SciencesBeijing 100190China College of Oceanography Hohai UniversityNanjing 211101China

Accurate estim.tions of typhoon-level winds are highly desired over the westem.Pacific Ocean.A wind speed retrieval algorithm.is used to retrieve the wind speeds within Super Typhoon Nepartak (2016)using 6.9- and 10.7-GHz brightness tem.eratures from.the Japanese Advanced m.crowave Scanning Radiom.ter 2 (Am.R2) sensor on board the Global Change Observation m.ssion-Water 1 (GCOm.Wl)*** results show that the retrieved wind speeds clearly represent the intensification process of Super Typhoon Nepartak.A good agreem.nt is found between the retrieved wind speeds and the Soil m.isture Active Passive wind speed *** m.an bias is 0.51 m.s,and the root-m.an-square difference is 1.93 m.s between *** retrieved m.xim.m.wind speeds are 59.6 m.s at 04:45 UTC on July 6 and 71.3 m.s at 16:58 UTC on July *** two results dem.nstrate good agreem.nt with the results reported by the China m.teorological Adm.nistration and the Joint Typhoon Warning *** addition,Feng-Yun 2G (FY-2G) satellite infrared im.ges,Feng-Yun 3C (FY-3C)m.crowave atm.spheric sounder data,and Am.R2 brightness tem.erature im.ges are also used to describe the developm.nt and structure of Super Typhoon Nepartak.

关键词： m.crowave radiom.ter sea surface wind retrieval Am.R2 Nepartak Sm.P

ENVIRONm.NTAL FRIENDLY ANODIZING ON AZ91D m.GNESIUm.ALLOYS AND COATING CHARACTERISTICS

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Acta m.tallurgica Sinica(English Letters) 2005年第3期18卷 411-415页

作者： A. Saijo m. Hino m. Hiram.tsu T. Kanadani Hori m.tal Finishing Industry Co. Ltd. Abe Ochiai-cho Takahashi-shi Okayama 716-0061 Japan Industrial Technology Research Institute of Okayama Prefecture Haga Okayama-sh i Okayama 701-1296 Japan Industrial Technology Research Institute of Okayama Prefecture Haga Okayama-sh i Okayama 701-1296 Japan Graduate School of Okayama University of Science Ridai-cho Okayama-shi Okayam a 700-0005 Japan

An environm.ntal friendly anodizing treatm.nt (Anom.g) from.a phosphate-based so lution without heavy m.tals on AZ91D m.gnesium.alloy was studied. The characteri stics of the coatings, such as structure, com.osition and corrosion resistance w ere investigated. The effects of this anodizing treatm.nt on the m.chanical prop erties were exam.ned. X-ray diffraction (XRD) analysis revealed that the structu re of the coatings is am.rphous or glassy. In salt spray tests coatings with an average thickness of 10μm.had an anticorrosive perform.nce of over 1000 hours. Fatigue tests revealed that anodizing onto AZ91D m.gnesium.alloy does not affect the fatigue strength. These results dem.nstrate the utility of this anodizing t reatm.nt on m.gnesium.alloy for application as a structural m.terial, such as in the autom.tive field.

关键词： m.gnesium.alloy anodizing environm.ntal friendliness

Evaluating the Effect of Tillage on Carbon Sequestration Using the m.nim.m.Detectable Difference Concept

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Pedosphere 2008年第4期18卷 421-430页

作者： X. m. YANG C. F. DRURY m. m. WANDER B. D. KAY Agriculture and Agri-Food Canada Harrow Ontario N0R 1G0 (Canada). Departm.nt of Natural Resources and Environm.ntal Science University of Illinois at Urbana-Champaign Urbana IL61801 (USA) Departm.nt of Land Resources University of Guelph Guelph Ontario N1G 2W1 (Canada)

Three long-term.field trials in hum.d regions of Canada and the USA were used to evaluate the influence of soil depth and sam.le num.ers on soil organic carbon (SOC) sequestration in no-tillage (NT) and m.ldboard plow (m.) corn (Zea m.ys L.) and soybean (Glycine m.x L.) production system.. The first trial was conducted on a m.ryhill silt loam.(Typic Hapludalf) at Elora, Ontario, Canada, the second on a Brookston clay loam.(Typic Argiaquoll) at Woodslee, Ontario, Canada, and the third on a Thorp silt loam.(Argiaquic Argialboll) at Urbana, Illinois, USA. No-tillage led to significantly higher SOC concentrations in the top 5 cm.com.ared to m. at all 3 sites. However, NT resulted in significantly lower SOC in sub-surface soils as com.ared to m. at Woodslee (10-20 cm. P = 0.01) and Urbana (20-30 cm. P m.re SOC storage than m. at the Elora site (3.3 m. C ha-1) and at the Woodslee site (6.2 m. C ha-1) on an equivalent m.ss basis (1350 m. ha-1 soil equivalent m.ss). Sim.larly, NT had greater SOC storage than m. at the Urbana site (2.7 m. C ha-1) on an equivalent m.ss basis of 675 m. ha-1 soil. However, these differences disappeared when the entire plow layer was evaluated for both the Woodslee and Urbana sites as a result of the higher SOC concentrations in m. than in NT at depth. Using the m.nim.m.detectable difference technique, we observed that up to 1500 soil sam.le per tillage treatm.nt com.arison will have to be collected and analyzed for the Elora and Woodslee sites and over 40 soil sam.les per tillage treatm.nt com.arison for the Urbana to statistically separate significant differences in the SOC contents of sub-plow depth soils. Therefore, it is im.racticable, and at the least prohibitively expensive, to detect tillage-induced differences in soil C beyond the plow layer in various soils.

关键词： carbon sequestration m.nim.m.detectable difference m.ldboard plow no-tillage soil depth

Turbulent m.lt Flow Excited by Am.litude-andFrequency m.dulated Rm.

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Journal of Iron and Steel Research International 2012年第S1期19卷 483-486页

作者： A.Kapusta m.Khavkin sh.Lesin B.m.khailovich B.Tilm.n Center for m.D Studies Ben-Gurion University of the NegevBeer-ShevaIsrael Departm.nt of m.chanical Engineering Ben-Gurion University of the NegevBeer-ShevaIsrael Energetics Technologies Ltd OmerIsrael

We exam.ne m.D processes arising in m.lts placed in vessels of circular and rectangular cross-sections under the action of am.litude-and-frequency m.dulated rotating m.gnetic *** is established that besides the m.an t... 详细信息

关键词： rotating m.gnetic field am.litude-and-frequency m.dulation electrom.gnetic body force velocity field velocity oscillation external friction m.del