检索结果-南通市图书馆

Application of Synthetic Iron Oxyhydroxide with Influencing Factors for Removal of As(Ⅴ) and As(Ⅲ) from Groundwater

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 Earth Science 2024年第3期35卷 998-1009页

作者： Shakeel ahmed Talpur Muhammad Yousuf Jat Baloch Chunli Su Javed Iqbal Aziz ahmed Hafeez ahmed Talpur School of Environmental Studies China University of GeosciencesWuhan 430078China DiSPUTer Department of PsychologicalHealth and Territory SciencesUniversity“G.d′Annunzio”Chieti-Pescara66100 ChietiItaly College of New Energy and Environment Jilin UniversityChangchun 130021China School of Plant Environment and Soil SciencesLouisiana State University Agricultural CentreBaton Rouge LA 70803USA Department od Engineering and Geology University“G.d′Annunzio”Chieti-Pescara66100 ChietiItaly

Synthesized iron oxyhydroxide was applied for the adsorptive removal of As(V)and As(III)from the aquas ***,this investigation highlighted the synergistic effect of calcium carbonate in conjunction with iron oxyhydroxide,resulting in enhanced removal *** experiment was conducted under various conditions:concentration,dosage,pH,agitation,and *** characterizations such as Brunauer Emmett Teller,X-ray diffraction,scanning electron microscopy,and Fourier transform infrared spectroscopy were implied to understand adsorption *** Langmuir model revealed optimal concentrations for As(V)=500μg/L at pH-5 and As(III)=200μg/L at pH-7,resulting in 95%and 93%adsorption efficiencies,*** adsorption capacities“qm”were found to be 1266.943μg/g for As(V)and 1080.241μg/g for As(III).Freundlich model demonstrated favorable adsorption by indicating“n>1”such as As(V)=2.542 and As(III)=2.707;similarly,the speciation factor“RL<1”for both species as As(V)=0.1 and As(III)=0.5,*** kinetic study presented a pseudo-second-order model as best fitted,indicating throughout chemisorption processes for removing As(V)and As(III).Furthermore,incorporating calcium carbonate presented a significant leap in the removal efficiency,indicating As(V)from 95%to 98%and As(III)from 93%to 96%,*** findings offer profound motivation for developing effective and sustainable solutions to tackle arsenic contamination,underscoring the exceptional promise of iron oxyhydroxide in conjunction with calcium carbonate to achieve maximum removal efficiency.

关键词： adsorption arsenic As(V) As(III) iron oxyhydroxide isotherms kinetics groundwater.

Challenges in spent nuclear fuel final disposal:conceptual design models

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2008年第2期19卷 117-120页

作者： Mukhtar ahmed RANA Physics Division Directorate of SciencePINSTECHP.O.NiloreIslamabadPakistan

The disposal of spent nuclear fuel is a long-standing issue in nuclear ***,UO_2 and metallic U arc used as a fuel in nuclear *** nuclear fuel contains fission products and transuranium elements,which would remain radioactive for 10~4 to 10~8 *** this brief communication,essential concepts and engineering elements related to high-level nuclear waste disposal are *** design models are described and discussed considering the long-time scale activity of spent nuclear fuel or high level *** of physical and chemical barriers to contain nuclear waste are *** regarding integrity,self-irradiation induced decomposition and thermal effects of decay heat on the spent nuclear fuel are also *** question of retrievability of spent nuclear fuel after disposal is considered.

关键词：核燃料概念设计模型自我辐射分解热反应

Multifunctional transition and temperature-responsive contact lenses

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2023年第12期12卷 2624-2635页

作者： ahmed E.Salih Haider Butt Department of Mechanical Engineering Khalifa UniversityAbu DhabiUAE

Smart contact lenses have recently gained traction due to their functionalization as noninvasive diagnostic and therapeutic wearables that can address several ocular ***,multifunctional contact lenses exhibiting UV-transition and temperature-responsive capabilities were developed utilizing chromogenic materials that were integrated simultaneously into poly(2-hydroxyethyl methacrylate)(pHEMA)contact *** functionalities of the contact lenses were optically evaluated in both their activated and non-activated *** contact lenses offered excellent UV and blue light blocking capabilities(~45%)at their inactive *** activated via UV exposure,the transparent lenses darkened instantaneously and absorbed portions of the visible light *** absorption intensity and transient discoloration of the transition lenses relied primarily on the utilized photochromic ***,the temperature-responsive contact lenses exhibited distinct colorimetric variations in response to temperature changes within the physiological range(33-38℃).The maximum sensitivity of the thermochromic lens was 8%transmitted light per Celsius degree *** and morphological analysis indicated the adequacy of the contact ***,the multifunctional contact lenses can be deployed as smart wearables to manage ophthalmic deficiencies that are deterred by UV radiations and variations in ocular surface temperature.

关键词： temperature spectrum material

A compound spike model for formation of nuclear tracks in solids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2007年第6期18卷 349-353页

作者： Mukhtar ahmed RANA Physics Division Directorate of SciencePINSTECHP.O.NiloreIslamabadPakistan

Formation of nuclear tracks in solids has been described as a thermal spike as well as a Coulomb explo- sion ***,formation of nuclear tracks is described as a compound spike including partial roles of both thermal and Coulomb explosion spikes in track *** roles of both spikes depend on atomic and electronic structure of a track detector and deposited energy density in the track detector by the incident charged ***- havior of the cylindrical zone along the path of the incident particle is described mathematically in terms of bulk and individual atomic flow or *** structure of the latent nuclear tracks is described and conditions of con- tinuity and discontinuity of latent tracks are evaluated and *** paper includes mathematical description, analysis and evaluation of the nuclear track formation issue in the light of published experimental and theoretical re- sults,which are useful for users of nuclear track detection technique and researchers involved in ion beam induced materials modification and ions implantation in semiconductors.

关键词：核子轨道探测技术晶体固态径迹探测探测方法

Disposal of high level nuclear wastes:Thermodynamic equilibrium and environment ethics

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2009年第3期20卷 188-192页

作者： RANA Mukhtar ahmed Physics Division Pakistan Institute of Nuclear Science and Technology (PINSTECH) Islamabad Pakistan

Contamination of soil, water or air, due to a failure of containment or disposal of high level nuclear wastes, can potentially cause serious hazards to the environment or human health. Essential elements of the environment and radioactivity dangers to it are illustrated. Issues of high level nuclear waste disposal are discussed with a focus on thermodynamic equilibrium and environment ethics. Major aspects of the issues are analyzed and described briefly to build a perception of risks involved and ethical implications. Nuclear waste containment repository should be as close as possible to thermodynamic equilibrium. A clear demonstration about safety aspects of nuclear waste management is required in gaining public and political confidence in any possible scheme of permanent disposal. Disposal of high level nuclear waste offers a spectrum of environment connected challenges and a long term future of nuclear power depends on the environment friendly solution of the problem of nuclear wastes.

关键词：核技术热力学核子研究加速器

Terlipressin and hepatorenal syndrome: What is important for nephrologists and hepatologists

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第41期16卷 5139-5147页

作者： ahmed A Magan Atif A Khalil Mohamed H ahmed Department of Surgery Cambridge Uni-versity Hospital NHS foundation Trust Hills Road Cambridge CB2 0QQ United Kingdom Department of Nephrology Royal Liverpool and Broadgreen University Hospitals Liverpool L7 8XP United Kingdom Division of Acute Medicine James Cook University Hospital Marton Road Middlesbrough TS4 3BW United Kingdom

Hepatorenal syndrome (HRS) is a reversible form of functional renal failure that occurs with advanced hepatic cirrhosis and liver failure. Despite mounting research in HRS, its etiology and medical therapy has not been resolved. HRS encompasses 2 distinct types. Type 1 is characterized by the rapid development of renal failure that occurs within 2 wk and involves a doubling of initial serum creatinine. Type 2 has a more insidious onset and is often associated with ascites. Animal studies have shown that both forms, in particular type 1 HRS, are often precipitated by bacterial infections and cir-culatory changes. The prognosis for HRS remains very poor. Type 1 and 2 both have an expected survival time of 2 wk and 6 mo, respectively. Progression of liver cir-rhosis and the resultant portal hypertension leads to the pooling of blood in the splanchnic vascular bed. The ensuing hyperdynamic circulation causes an ineffective circulatory volume which subsequently activates neuro-hormonal systems. Primarily the sympathetic nervoussystem and the renin angiotensin system are activated, which, in the early stages of HRS, maintain adequate circulation. Both advanced cirrhosis and prolonged ac-tivation of neurohormonal mechanisms result in fatal complications. Locally produced nitric oxide may have the potential to induce a deleterious vasodilatory effect on the splanchnic circulation. Currently medical therapy is aimed at reducing splanchnic vasodilation to resolve the ineffective circulation and maintain good renal per-fusion pressure. Terlipressin, a vasopressin analogue, has shown potential benefit in the treatment of HRS. It prolongs both survival time and has the ability to re-verse HRS in the majority of patients. In this review we aim to focus on the pathogenesis of HRS and its treatment with terlipressin vs other drugs.

关键词： Heptorenal syndrome Terlipressin Kidney Liver

Efficacy of using NRT thresholds in cochlear implants fitting,in prelingual pediatric patients

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 Otology 2019年第4期14卷 128-135页

作者： ahmed Allam ahmed Eldegwi Department of Otolaryngology Mansoura University

Objective:To evaluate the efficacy of using neural response telemetry(NRT)thresholds in predicting behavioural thresholds during programming of cochlear implant in prelingual ***:Prospective study of 28 cochlear implants implanted with Nucleus 24 cochlear *** recorded NRT-thresholds on electrode numbers 1,6,11,16 and 22 of the electrode array in each patient,the neural response thresholds were correlated with the behavioural map after six months of programming the ***:The mean neural response telemetry level was significantly higher than the mean threshold level(T-level)but lower than the comfortable level(C-level)in all the electrodes *** levels could statistically significantly predict T behavioural levels and comfortable behavioural levels,p<*** was a strong positive correlation between comfortable thresholds and neural response telemetry level measurements and behavioural threshold level and neural response telemetry threshold ***:There is a useful role for neural response telemetry values in predicting the behavioural threshold and comfortable values in prelingual *** the NRT values with behavioural observations can improve the programming of cochlear implants.

关键词： NRT ECAP Behavioural levels Cochlear implant Programming

Effects of Avian Wings Color Patterns on Their Flight Performance:Experimental and Computational Studies

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2023年第2期20卷 683-710页

作者： ahmed Aboelezz Brenden Herkenhoff Mostafa Hassanalian Department of Mechanical Engineering New Mexico Institute of Mining and TechnologySocorroNM87801USA

There are many theories behind the colors of a bird’s *** of these theories point to the color’s purpose to attract mates and hide from *** recent investigations concluded that the dark colors of birds help in reducing the drag force during flight.A new theory is presented in the current research,which states that a bird's dark color not only reduces the drag,but the color pattern also improves the overall flight performance,and each color pattern has a different type of flight performance *** difference in improvement is a result of variation in hot and cold surfaces on the bird skin as a result of the variation between light and dark feather *** prove this new theory,thermal images were captured of real bird wings under the effect of infrared ***,a novel wind tunnel wing with the ability to adjust the temperature in desired locations and patterns on the wing’s surface was manufactured and tested to evaluate the effect of aerodynamics forces as a function in the surface temperature and the hot–cold *** collected data from this wing showed potential flight efficiency improvements of 20%,comparing the lift-to-drag ratio for specific heating cases,which could increase the flight *** considering lift and drag,there were specific heating cases with corresponding angles of attack in which these parameters improved by up to 20%and 7%,*** heating cases could increase the lift at a low angle of attack,which is helpful in cruise flight performance,while some cases could increase the maximum lift coefficient by 6%.This is very helpful in lowering stall and the minimum flight ***,some cases could increase the lift-to-drag ratio,which led to an increase in the flight *** better understand the effect of the various patterns,computational fluid dynamics(CFD)simulations were conducted on the *** new theory was proved based on the CFD results and verified through the success

关键词： Aerodynamic loads CFD Drag Heated boundary layer Surface temperature

A combined contour lines iteration algorithm and Delaunay triangulation for terrain modeling enhancement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2023年第3期26卷 558-576页

作者： Yehia Miky Abdullah Kamel ahmed Alshouny Department of Geomatics King Abdul aziz UniversityJeddahSaudi Arabia Faculty of Engineering Aswan UniversityAswanEgypt National Water Research Center Survey Research InstituteGizaEgypt

Digital Elevation Models(DEMs)play a crucial role in civil and environmental applications,such as hydrologic and geologic analyses,hazard monitoring,natural resources exploration,***,DEMs can be generated from various data sources,such as ground surveys,photogrammetric stereo methods,satellite images,laser scanning,and digitized contour *** with other data sources,contour lines are still the cheapest and more common data source becausethey cover all areas,at different scales,in most *** there are different algorithms and technologies for interpolation in between contour lines,DEMs extracted solely from contours still suffer from poor terrain quality representation,which in turn negatively affects the quality of analytical applications *** this paper,an approach for improving the digital terrain modeling based on contour line densification and Delaunay triangulation is presented to acquire a more suitable DEM for hydrographic modeling and its *** proposed methodology was tested using a variety of terrain patterns in terms of intensity:hilly,undulated,and plain(1:25,000 topographic map,5 m contour interval).The precision of the extracted GRID model increases as the number of added contours *** four contour lines,the Root Mean Square Error(RMSE)of examining points were 0.26 m,0.29 m,and 0.05 m for hilly,undulated,and plain samples,respectively,and the Mean Absolute Error(MAE)were 0.50 m,0.48 m,and 0.17 *** convergence probabilities between extracted and original flow lines for the same regions were 96.91%,94.93%,and 84.03%.Applying the methodology,experimental results indicate that the developed approach provides a significant advantage in terrain modeling enhancement,generates DEMs smoothly and effectively from contours,mitigates problems and reduces uncertainties.

关键词： Contours Digital Elevation Model(DEM) Triangulated Irregular Network(TIN) Delaunay triangulation