检索结果-南通市图书馆

Hydrodynamic Assessment of A New Nature-Based Armour Unit on Rubble mound Breakwater for Coastal Protection

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第3期38卷 439-452页

作者： Ehsan safa Alireza mOJTAHEDI Abdolmajid mOHAmmADIAN mohamad Ali Lotfollahi YAGHIN Department of Water Resources Engineering Faculty of Civil EngineeringUniversity of TabrizTabriz ***Iran Faculty of Civil Engineering University of OttawaOttawa K1H 8M5Canada

This research proposes a novel nature-based design of a new concrete armour unit for the cover layer of a rubblemoundbreakwater. Armour units are versatile with respect to shape, orientation, surface condition details, and ***, a detailed analysis is required to investigate the exact state of their hydraulic interactions and structuralresponses. In this regard, the performance results of several traditional armour units, including the Antifer cube,Tetrapod, X-block and natural stone, are considered for the first step of this study. Then, the related observed resultsare compared with those obtained for a newly designed (artificial coral) armour unit. The research methodology utilizesthe common wave flume test procedure. Furthermore, several verified numerical models in OpenFOAm code areused to gain the extra required data. The proposed armour is configured to provide an effective shore protection as anenvironmental-friendly coastal structure. Thus it is designed with a main trunk including deep grooves to imitate thetypical geometry of a coral type configuration, so as to attain desirable performance. The observed results and ananalytic hierarchy process (AHP) concept are used to compare the hydraulic performance of the studied traditionaland newly proposed (artificial coral) armour units. The results indicate that the artificial coral armour unit demonstratesacceptable performance. The widely used traditional armour units might be replaced by newer designs for betterwave energy dissipation, and more importantly, for fewer adverse effects on the marine environment.

关键词： rubble mound breakwater hydraulic interaction armour unit analytic hierarchy process numerical model

Extraterrestrial Life in the Thermosphere: Plasmas, UAP, Pre-Life, Fourth State of matter

在线全文

学校读者我要写书评

暂无评论

Journal of modern Physics 2024年第3期15卷 322-376页

作者： R. Joseph C. Impey O. Planchon R. del Gaudio m. Abu safa A. R. Sumanarathna E. Ansbro D. Duvall G. Bianciardi C. H. Gibson R. Schild Astrobiology Research Center California USA Department of Astronomy University of Arizona Tucson USA Biogéosciences Laboratory University of Burgundy Dijon France Department of Biology University of Naples Federico II Naples Italy Department of Applied Physics Palestine Polytechnic University Hebron Palestine Department of Research and Innovation Eco Astronomy International Research Center Tetouan Morocco Space Exploration Ltd. Boyle County Roscommon Ireland Department of Zoology Oklahoma State University (Emeritus) Stillwater USA Department of Science and medicine Università Degli Studi di Siena Tuscany Italy Center for Astrophysics and Space Sciences University of California (Emeritus) San Diego USA Center for Astrophysics Harvard-Smithsonian (Emeritus) Cambridge USA

“Plasmas” up to a kilometer in size and behaving similarly to multicellular organisms have been filmed on 10 separate NASA space shuttle missions, over 200 miles above Earth within the thermosphere. These self-illuminated “plasmas” are attracted to and may “feed on” electromagnetic radiation. They have different morphologies: 1) cone, 2) cloud, 3) donut, 4) spherical-cylindrical;and have been filmed flying towards and descending from the thermosphere into thunderstorms;congregating by the hundreds and interacting with satellites generating electromagnetic activity;approaching the Space Shuttles. Computerized analysis of flight path trajectories documents these plasmas travel at different velocities from different directions and change their angle of trajectory making 45°, 90°, and 180° shifts and follow each other. They’ve been filmed accelerating, slowing down, stopping, congregating, engaging in “hunter-predatory” behavior and intersecting plasmas leaving a plasma dust trail in their wake. Similar life-like behaviors have been demonstrated by plasmas created experimentally. “Plasmas” may have been photographed in the 1940s by WWII pilots (identified as “Foo fighters”);repeatedly observed and filmed by astronauts and military pilots and classified as Unidentified Aerial—Anomalous Phenomenon. Plasmas are not biological but may represent a form of pre-life that via the incorporation of elements common in space, could result in the synthesis of RNA. Plasmas constitute a fourth state of matter, are attracted to electromagnetic activity, and when observed in the lower atmosphere likely account for many of the UFO-UAP sightings over the centuries.

关键词： Extraterrestrials Plasmas Dusty Plasmas Extremophiles Life in Space Abiogenesis Origins of Life RNA World

HIGH-ORDER EXPLICIT TImE-INTEGRATORS FOR DISCONTINUOUS GALERKIN DISCRETIZATIONS OF THE mAXWELL EQUATIONS

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

International Journal of modeling, Simulation, and Scientific Computing 2013年第1期4卷 132-153页

作者： H.FAHS m.safa LAmA Laboratory University Paris-Est Marne-la-Vallee UMR CNRS 80505 boulevard Descartes 77454 Marne-la-Vall´ee Cedex 2France INRIA Paris-Rocquencourt Domaine de Voluceau BP.10578153 Le Chesnay CedexFrance

We investigate the practical implementation of a high-order explicit time-stepping method based on polynomial approximations,for possible application to large-scale problems in *** the spatial discretization by a high-order discontinuous Galerkin method,we obtain a linear system of differential equations of the form,∂tY(t)=HY(t)+S(t),where H is a matrix containing the spatial derivatives and t is the time *** formal solution can be written in terms of the matrix exponential,exp(tH),acting on some *** introduce a general family of time-integrators based on the approximation of exp(tH)by Jacobi polynomial *** discuss the efficient implementation of this technique,and based on some test problems,we compare the virtues and shortcomings of the *** also demonstrate how these schemes provide an efficient alternative to standard explicit integrators for computing solutions over long time intervals.

关键词： maxwell’s equations discontinuous Galerkin method time-stepping schemes

Dielectric response and electric properties of organic semiconducting phthalocyanine thin films

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 Semiconductors 2012年第8期33卷 15-21页

作者： A.m.Saleh S.m.hraibat R.m-L.Kitaneh m.m.Abu-Samreh S.m.musameh Physics Department Al-Quds UniversityJerusalemPalestine physics Department An-Najah UniversityNablusPalestine

The dielectric function of some phthalocyanine compounds （ZnPc, H2Pc, CuPc, and FePc） were investigated by analyzing the measured capacitance and loss tangent data. The real part of the dielectric constant, ca, varies strongly with frequency and temperature. The frequency dependence was expressed as： ε1 = Aε^n, where the index, n, assumes negative values （n 〈 0）. In addition, the imaginary part of the dielectric constant, ε2, is also frequency and temperature dependent. Data analysis confirmed that ε2 = Bo）m with values of m less than zero. At low frequencies and all temperatures, a strong dependence is observed, while at higher frequencies, a moderate dependence is obvious especially for the Au-electrode sample. Qualitatively, the type of electrode material had little effect on the behavior of the dielectric constant but did affect its value. Analysis of the AC conductivity dependence on frequency at different temperatures indicated that the correlated barrier hopping （CBH） model is the most suitable mechanism for the AC conduction behavior. maximum barrier height, W, has been estimated for ZnPc with different electrode materials （Au and AI）, and had values between 0.10 and 0.9 eV. For both electrode types, the maximum barrier height has strong frequency dependence at high frequency and low temperatures. The relaxation time, r, for ZnPc and FePc films increases with decreasing frequency. The activation energy was derived from the slopes of r versus 1/T curves. At low temperatures, an activation energy value of about 0.01 eV and 0.04 eV was estimated for ZnPc and FePc, respectively. The low values of activation energy suggest that the hopping of charge carriers between localized states is the dominant mechanism.

关键词： organic semiconductor dielectric function evaporation relaxation time

Square-root parametrization of dark energy in f(Q)cosmology

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2023年第12期75卷 105-114页

作者： m Koussour N myrzakulov Alnadhief H A Alfedeel E I Hassan D Sofuoğlu safa m mirgani Quantum Physics and magnetism Team LPMCFaculty of Science Ben M'sikCasablanca Hassan II University L.N.Gumilyov Eurasian National University Ratbay myrzakulov Eurasian International Centre for Theoretical Physics Department of mathematics and Statistics Imam Mohammad Ibn Saud Islamic University(IMSIU) Department of Physics Faculty of ScienceUniversity of Khartoum Centre for Space Research North-West University Department of Physics Istanbul University Vezneciler 34134

This paper is a parametrization of the equation of state(Eo S)parameter of dark energy(DE),which is parameterized using square-root(SR)form i.e.ω_(SR)=ω_(0)+ω_(1)z/√z^(2)+1,where ω_(0)and ω_(1) are free *** parametrization is examined in the context of the recently suggested f(Q)gravity theory as an alternative to general relativity(GR),in which gravitational effects are attributed to the non-metricity scalar Q with the functional form f(Q)=Q+αQ^(n),whereαand n are arbitrary *** derive observational constraints on model parameters using the Hubble dataset with 31 data points and the Supernovae(SNe)dataset from the Pantheon samples compilation dataset with 1048 data *** the current model,the evolution of the deceleration parameter,density parameter,EoS for DE,and Om(z)diagnostic have all been *** has been shown that the deceleration parameter favors the current accelerated expansion *** has also been shown that the EoS parameter for DE has a quintessence nature at this time.

关键词： cosmology dark energy f(Q)gravity EoS parameter

Implementation of a Petrographical and Petrophysical Workflow Protocol for Studying the Impact of Heterogeneity on the Rock Typing and Reservoir Quality of Reefal Limestone:A Case Study on the Nullipore Carbonates in the Gulf of Suez

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2021年第5期95卷 1746-1762页

作者： mona G.safa Bassem S.NABAWY Ahmed m.K.BASAL mohammad A.OmRAN Aref LASHIN Geology Department Faculty of ScienceDamietta UniversityNew Damietta CityEgypt Department of Geophysical Sciences National Research CentreDokkiCairoEgypt Petroleum and Natural Gas Engineering Department College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia Benha University Faculty of ScienceGeology DepartmentBenhaEgypt

This study focuses on the heterogeneity of the middle miocene syn-rift Belayim nullipore(reefal)marine sequences in the Gulf of Suez and its impacts on reservoir *** sequences consist of coralline algal reef limestones with a highly complex dual-porosity system of primary and secondary porosities of widely varying *** achieve a precise mathematical modeling of these reservoir sequences,a workflow protocol was applied to separate these sequences into a number of hydraulic flow units(HFUs)and reservoir rock types(RRTs).This has been achieved by conducting a conventional core analysis on the nullipore marine *** illustrate the heterogeneity of the nullipore reservoir,the Dykstra-Parsons coefficient(V)has been estimated(V=0.91),indicating an extremely heterogeneous reservoir.A slight to high anisotropy(λ_(k))has been assigned for the studied nullipore sequences.A stratigraphic modified Lorenz plot(SmLP)was applied to define the optimum number of HFUs and barriers/baffles in each of the studied *** the permeability-porosity,reservoir quality index-normalized porosity index(RQI-NPI)and the RQI-flow zone indicator(RQIFZI)plots,the discrete rock types(DRT)and the R35 techniques enable the discrimination of the reservoir sequences into 4 RRTs/*** RRT4 packstone samples are characterized by the best reservoir properties(moderate permeability anisotropy,with a good-to-fair reservoir quality index),whereas the RRT1 mudstone samples have the lowest flow and storage capacities,as well as the tightest reservoir quality.

关键词： reservoir heterogeneity nullipore rock typing hydraulic flow units Dykstra-Parsons coefficient stratigraphic modified Lorenz plot(SmLP)

Receiving antenatal care via mobile clinic: Lived experiences of Jordanian mothers

在线全文

学校读者我要写书评

暂无评论

International Journal of Nursing Sciences 2023年第2期10卷 230-237页

作者： Hala A.Bawadi Asma’a S.Abu Abed Zaid m.Al-Hamdan safa m.Alzubi maternal and Child Health Department School of Nursing the University of JordanAmmanJordan National Women Health Center(resigned) Royal Medical ServicesAmmanJordan Faculty of Nursing Jordan University of Science and Technology IrbidJordan Royal medical Services AmmanJordan

Objective To understand the perceptions of pregnant Jordanian women who received antenatal care via mobile clinic,and to contribute new insights into the experiences of these mothers and how they evaluated the services that were *** Ten Jordanian mothers who had received antenatal care at a mobile clinic discussed their experiences in semi-structured,audiotaped interviews in a study that adopted a qualitative research *** analysis was done using interpretative phenomenological *** Three main themes were identified:Being informed about the medical campaign or missing the opportunity of being informed;The experience of receiving antenatal care was wonderful,although there was only one thing lacking;and they safeguard our life and take any opportunity to educate *** Data indicate that the mothers were largely satisfied with most facets of the antenatal care services they had received at the mobile ***,while services are generally well received,there are clear opportunities for ameliorating the quality of services *** mothers living in remote,deprived areas,outreach is not just an‘optional extra’but rather an essential service.

关键词： Jordan mobile health units Pregnancy Pregnant women Prenatal care Qualitative research

On the unipolarity of charge transport in methanofullerene diodes

在线全文

学校读者我要写书评

暂无评论

npj Flexible Electronics 2017年第1期1卷 100-105页

作者： Ardalan Armin safa Shoaee Qianqian Lin Paul L Burn Paul meredith Centre for Organic Photonics&Electronics The University of QueenslandSt Lucia CampusBrisbaneQLD 4072Australia Centre for Engineered Quantum Systems School of Mathematics and PhysicsThe University of QueenslandSt Lucia CampusBrisbaneQLD 4072Australia Institute of Physics and Astronomy University of PotsdamKarl-Liebknecht-Straße 24-25Potsdam-Golm D-14476Germany Clarendon Laboratory Department of PhysicsThe University of OxfordParks Road OxfordOxfordOX13PUUK Department of Physics Swansea UniversitySingleton ParkSwanseaWales SA28PPUK

Fullerenes are electron transporting organic semiconductors with a wide range of *** particular,methanofullerenes have been the preferred choice for solution-processed solar cells and *** wide applicability of fullerenes as both‘ntype’transport materials and electron acceptors is ***,what is still a matter of debate is whether the fullerenes can also support efficient transport of holes,particularly in diode *** this letter,we utilize a number of recently developed experimental methods for selective electron and hole mobility *** show for the two most widely used solution processable fullerenes,PC70-and-PC60Bm,that whilst both exhibit electron mobilities as high as 10^(−3)cm^(2)/Vs,their hole mobilities arem^(2)/*** charge transport in these fullerenes can be considered predominantly unipolar in diode configurations.

关键词： charge utilize polarity

The synthesis of boronic-imine structured compounds and identification of their anticancer, antimicrobial and antioxidant activities

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 Pharmaceutical Analysis 2016年第1期6卷 39-48页

作者： Salih Pasa safa Aydln Sadlk Kalaycl mehmet Boga metin Atlan murat Bingul Fikrettin Sahin Hamdi Temel Science and Technology Research and Application Center Dicle University 21280 Diyarbalar Turkey Department of Genetics and Bioengineering Faculty of Engineering and Architecture Yeditepe University Kayisdagi 34755 lstanbul Turkey Department of Pharmaceutical Chemistry Faculty of Pharmacy Dicle University 21280 Diyarbakir Turkey

Boronic acid compounds with different substituted groups were handled to synthesize various ligands encoded as B1, B2, B3, B4, BS, B6, B7 and BS. B5 and B7 were tested for the cytotoxic activity against the prostate cancer cells and it was found that the cell viability of cancer cells was decreased while most of the healthy cells could still be viable. 5 μm solutions of B5 and B7 decreased the cell viability to 33% and 44%; whereas healthy cells were 71% and 95%, respectively, after treatment. Antimicrobial properties were explored against the bacterial and fungal microorganisms with B1, B5 and BZ The inhibition zones were evaluated for all boronic structures, and the growth inhibition zones were determined in a range of 7-13 mm diameter for different microorganism species. Staphylococcus aureus was the common micro- organism that three boronic compounds with imine ligands showed the activity. Antioxidant features of B2, B3, B4, B5, B6, B7 and B8 were investigated by different processes such as Beta-carotene bleaching （BCB）, 2,2-diphenyl picryl hydrazyl （DPPH）, 2,2″-azino-bis（ 3-ethylbenzothiazoline-6-sulphonic acid）（ABTS） and CUPric reducing antioxidant capacity （CLIPRAC） methods. Significant antioxidant activity was achieved by the phenyl boronic based ligands and these compounds demonstrated as much activity as standards （α-Toc and BHT）. In addition, all structures were applied properly without any decomposition during the experiments. They were rather stable both in aqueous media and solid state.

关键词： Boronic compounds Imine base Anticancer activity Antioxidant Antimicrobial