检索结果-南通市图书馆

Journal of Green Building 2016年第2期11卷 75-92页

作者： jorge S.Carlos C-MADE Centre of Materials and Building TechnologiesUniversity of Beira InteriorCalçada Fonte do Lameiro6200-358 CovilhãPortugal

This paper investigates the main characteristics of daylight on any window in a street *** sky component and the light reflected from the surroundings are described to determine the vertical daylight factor(VDF).Several street canyon types are characterized taking into account their different height/width and any level of the window is analysed.A simple calculation method uses trigonometric equations based on the sky and the geometry of the *** results were previ-ously evaluated considering different daylight procedures obtained by other *** study reveals that the reflectance within an urban canyon plays an important role in the amount of daylight onto any window with more relevance in a deep canyon and low sky *** graphical presentation that result from this investiga-tion can rapidly assist building and urban designers in an early stage design where assumptions and the lay out of the main design take place.

关键词： vertical daylight factor urban canyon configuration factor diffuse light isotropic overcast sky

Topological circuit of a versatile non-Hermitian quantum system

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(Physics,Mechanics & Astronomy) 2022年第1期65卷 53-60页

作者： David-Andres Galeano Xiao-Xiao Zhang jorge Mahecha Instituto de F´ısica Facultad de Ciencias Exactas y NaturalesUniversidad de AntioquiaMedell´ın 050010Colombia Unidad Transacciones T&D Energ´ıa Gerencia Comercial T&D Energ´ıaV.P.T&D Energ´ıaEPMMedell´ın 050015Colombia Department of Physics and Astronomy&Stewart Blusson Quantum Matter Institute University of British ColumbiaVancouver V6T 1Z4Canada RIKEN Center for Emergent Matter Science(CEMS) Saitama 351-0198Japan Department of Chemistry University of British ColumbiaVancouver V6T 1Z4Canada

We propose a resistors,inductors and capacitors(RLC)electrical circuit to theoretically analyze and fully simulate a new type of non-Hermitian Su-Schrieffer-Heeger(SSH)model with complex *** formulate its construction and investigate its properties by taking advantage of the circuit’s *** physical properties can be identified in this system from the normal modes of oscillation of the RLC circuit,including the highly tunable bulk-edge correspondence between topological winding numbers and edge states and the non-Hermitian skin phenomenon originating from a novel complex energy plane *** present study is able to show the wide and appealing topological physics inherent to electric circuits,which is readily generalizable to a plenty of both Hermitian and non-Hermitian nontrivial systems.

关键词： topolectric circuit SSH model non-Hermitian topology skin effect

OPTIMAL WINDOW GEOMETRY FACTORS FOR ELEMENTARY SCHOOL BUILDINGS IN PORTUGAL

在线全文

学校读者我要写书评

暂无评论

Journal of Green Building 2018年第1期13卷 185-197页

作者： jorge S.Carlos Centre of Materials and Building Technologies(CMADE-UBI) Universidade da Beira InteriorRua Marquês D’Ávila e Bolama6200-001CovilhãPortugal

INTRODUCTION With respect to thermal performance, windows are the weakest component of the building envelope, essentially because the U-value is usually higher than the opaque envelope. This would allow the highest heat conductance of the building envelope. However, it also helps buildings to gain useful solar heat during winter. Therefore, it has been generally accepted that passive buildings would have small windows towards the poles and large windows facing the equator (Persson, Roos, and Wall 2006). In spite of this guideline, large or fully glazed facades have been used in modern architecture. The intensive use of air conditioning is the result of overheating and high thermal loss problems, which otherwise would lead to thermal discomfort. This extensive use of large windows associated with high energy consumption has motivated researchers to study this building component. Window areas were investigated by Persson et al. (Persson, Roos, and Wall 2006) on 20 terraced houses with larger windows facing the equator and built in Gothenburg. The building envelope was well insulated and fitted with energy efficient windows. It was found that energy efficient windows do not have a major influ-ence on the heating demand in the winter, but it is relevant for the cooling need in summer. Therefore, reduced indoor illuminance due to small windows can be solved by enlarging them in order to obtain relevant daylighting conditions. When efficient windows are designed for a warm climate, as in Mexico, reducing heat flux and solar transmittance indoors was the best option for energy savings (Aguilar et al. 2017). However, reducing solar transmittance influences the indoor illuminance, which was not analyzed.

关键词： school building classroom windows solar heat gain daylight

Elastic Scattering of CH_4 by Electron Impact

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

Communications in Theoretical Physics 2008年第11期50卷 1229-1232页

作者： jorge L.S.Lino Universidade Braz Cubas-UBC Campus I 08773-380 Mogi das Cruzes Instituto de Ciencias Aplicadas ICAVPSao Jose dos CamposSP/Brasil

In this work we present a theoretical study on electrons scattering by CH4 in the intermediate energy range. More specifically, we report integral and differential cross sections for electron scattering by CH4 in the （10 - 300） eV range by the Schwinger multichannel method using plane waves as a trial basis set （SMC-PW）. To include exchange effects we have used the Born-Ochkur model. Our aim is to study the numerical stability of the cross sections and our calculated results compared with experimental data and theoretical studies are encouraging.

关键词： Schwinger method electron scattering

Performance and potential of porous carbons derived of electrospun metal-organic frameworks for supercapacitor applications

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第10期31卷 348-353,I0008页

作者： Petra Agota Szilagyi Ana jorge Sobrido School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK

Supercapacitors(SCs) are energy storage devices with the ability to charge and discharge at very high rates. The fast accumulation and release of charges occurs either electrostatically or electrochemically. There are two types of capacitors: electric double layer capacitors(EDLCs) and pseudocapacitors. EDLCs are the most commercially available.

关键词： Electrospinning MOFs Porous carbons Supercapacitors Electrodes Energy storage

Preparation of Rod-like Aluminum Doped Zinc Oxide Powders by Sol-gel Technique Using Metal Chlorides and Acetylacetone Precursors

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1293-1297页

作者： KESHTKAR Javad VARGAS GARCIA jorge Roberto GALAVIZ PEREZ jorge MARTINEZ TRINIDAD José Escuela Superior de Ingenieria Mecánica y Eléctrica Instituto Politécnico NacionalMéxico07738CDMXMéxico Escuela Superior de Ingenieria Quimica e Industrias Extractivas Instituto Politécnico NacionalMéxico07738CDMXMéxico Universidad Juárez Autònoma de Tabasco DivisiònAcadémica Multidisciplinaria de Jalpa de MéndezRibera AltaJalpa de MéndezTabasco86205México

Al-doped ZnO(AZO) powders were prepared by using metal chloride precursors and the sol-gel technique. IR peaks observed at 1590 cm-1 and 1620 cm-1indicated the formation of metal chelate as a consequence of the addition of acetylacetone to the metal chloride solution. TG-DSC analysis of the AZO gels confirmed the formation of metal chelate as evidenced by the development of several weight loss peaks accompanied by the introduction of new endothermic peaks. The resulting AZO gels were annealed at 500, 600, and 800 ℃ to study the effect of annealing temperature. XRD and SEM results showed that crystallization of AZO gels takes place around 600 ℃. Hexagonal wurtzite structure was identified as the main phase for all the samples. In addition, small shift of the XRD(002) peak coupled with XPS results from the AZO powders confirmed the successful doping of the ZnO powders. Micron sized rod-like AZO powders were uniform in dimension and morphology and remained stable even at 800 ℃.

关键词： aluminum doped ZnO rod-like metal chloride sol gel acetylacetone

Polarization in cyclotron radiation in strong magnetic fields

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2010年第10期10卷 1023-1040页

作者： Luidmila Semionova Denis Leahy jorge Paez Department of Physics Universidad National Department of Physics and Astronomy University of CalgaryA Space Research Center University of Costa Rica

We revisit the problem of radiative transitions of electrons in the presence of a strong magnetic field. We derive fully relativistic cyclotron transition rates for an arbitrary magnetic field, for any orientation of electron spin and for any polarization of the emitted radiation. Also, we obtain the transition rates for any value of the initial electron＇s parallel momentum. For very strong magnetic fields, transitions to the ground state predominate. Transition rates summed over the electron＇s spin orientation and for unpolarized radiation are also obtained, which confirm previous results by Latal. Transition widths are calculated for different electron spin orientations and different polarizations of radiation. We obtain general expressions for transition rates that reduce to the results for the non-relativistic case and for unpolarized radiation. Additionally we get, for the non-relativistic approximation, the transition rates for any polarization of radiation. As an application, the first five emission lines are evaluated and compared to the X-ray emitting neutron star V0332＋53, which has multiple observable cyclotron lines, taking into account gravitational redshift. The most probable polarization is ε（2）.

关键词： stars neutron -- radiation mechanisms non-thermal -- stars magneticfields -- polarization

Refractive surgery today: is there innovation or stagnation?

在线全文

学校读者我要写书评

暂无评论

Eye and Vision 2014年第1期1卷 21-23页

作者： jorge Alio Ophthalmology Miguel Hernandez UniversityAlicanteSpain Vissum Corporation AlicanteSpain

Refractive surgery,both corneal and intraocular,has undergone an explosive evolution during the last 25 *** first excimer laser surgery performed now already over 25 years ago is a historical landmark which started the scientific age of corneal refractive *** that momentous occasion,refractive surgery was a buccaneer procedure that lacked consistent scientific knowledge about the long-term outcomes of the procedures that were practiced(mainly radial and astigmatic keratotomy).In other words,there was a complete lack of objective outcome analysis coupled with almost no perspective on what the future development of this subspecialty was going to hold[1].A classic example of this is Radial Keratotomy,which was extensively performed in Europe,the US and Latin America at the end of the 80’s and early 90’*** the PERK study was able to detect and announce the trend towards hyperopic flattening of these corneas years later when they approached the technique in a systematic way by studying a relatively small number of cases[2-4].

关键词： Refractive refractive Latin

Structure,stability,catalytic activity,and polarizabilities of small iridium clusters

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

Chinese Physics B 2018年第6期27卷 225-230页

作者： Francisco E jorge José R da Costa Venaancio Unidade Academica dc Ffsica Universidade Federal de Campina Grande 58429-900 Campina Grande Brazil Departamento de Ffsica Universidade Federal do Espfrito Santo 29060-900 Vitoria Brazil

At the second order Douglas–Kroll–Hess（DKH2） level, the B3 PW91 functional in conjunction with the relativistic all-electron basis set of valence triple zeta quality plus polarization functions are employed to compute bond lengths, dissociation energies, vertical ionization potentials, and the highest occupied molecular orbital-lowest unoccupied molecular orbital energy gaps of the small iridium clusters（Irn, n≤8）. These results are compared with the experimental and theoretical data available in the literature. Our results confirm the theoretical predictions made by Feng et al. about the catalytic activities of the Ir4 and Ir6 clusters. From the optimized geometries, DKH2 calculations of static electric mean dipole polarizabilities and polarizability anisotropies are also carried out. It is the first time that the polarizabilities of small iridium clusters have been studied. For n≤4, the mean dipole polarizabilities per atom present an odd–even oscillatory behavior,whereas from Ir5 to Ir8, they decrease with the cluster size increasing. The dependence of the polarizability anisotropy on the structure symmetry of the iridium cluster is verified.

关键词： B3PW91 functional all-electron basis sets DKH2 calculations iridium clusters polarizabilities

Light Front Boson Model Propagation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2011年第6期55卷 1029-1040页

作者： jorge Henrique Sales Alfredo Takashi Suzuki Universidade Estadual de Santa Cruz km 16 Rodovia Ilheus-Itabuna-45662-900-IlheusBABrazil Instituto de Fisica Teorica UNESP-Universidade Estadual PaulistaRua Dr.Bento Teobaldo Ferraz 271-Bl.ⅡBarra Funda01140-070Sao PauloSao PauloBrazil

The scope and aim of this work is to describe the two-body interaction mediated by a particle （either the scalar or the gauge boson） within the light-front formulation. To do this, first of all we point out the importance of propagators and Green functions in Quantum Mechanics. Then we project the covariant quantum propagator onto the light front time to get the propagator for scalar particles in these coordinates. This operator propagates the wave function from x＋ = 0 to x＋〉 0. It corresponds to the definition of the time ordering operation in the light front time x＋. We calculate the light-front Green＇s function for 2 interacting bosons propagating forward in x＋. We also show how to write down the light front Green＇s function from the Feynman propagator and finally make a generalization to N bosons.

关键词： insert light-front bosons propagation