检索结果-南通市图书馆

Chinese Physics B 2013年第12期22卷 74-81页

作者： Akpan n. Ikot Elham Maghsoodi Eno J. Ibanga Saber Zarrinkamar Hassan Hassanabadi Theoretical Physics Group Department of Physics University of Uyo-Nigeria Department of Basic Sciences Shahrood Branch Islamic Azad University Department of Basic Sciences Garmsar Branch Islamic Azad University

In this paper, we obtain approximate analytical solutions of the Dirac equation for the shifted Hulthén potential within the framework of spin and pseudospin symmetry limits for arbitrary spin–orbit quantum number κ using the supersymmetry quantum mechanics. The energy eigenvalues and the corresponding Dirac wave functions are obtained in closed forms.

关键词： Dirac equation supersymmetry method spin and pseudospin symmetries shifted Hulthén potential

Rheological and tribological approaches as a tool for the development of sustainable lubricating greases based on nano-montmorillonite and castor oil

在线全文

学校读者我要写书评

暂无评论

Friction 2021年第2期9卷 415-428页

作者： Jose Enrique MARTÍn-ALFOnSO María Jose MARTÍn-ALFOnSO Concepción VALEnCIA María Teresa CUBERES Department of Chemical Engineering and Materials Science Campus de“El Carmen”University of HuelvaChemical Product and Process Technology Research Center(Pro2TecS)Huelva 21071Spain Department of Applied Mechanics and Project Engineering University of Castilla-La ManchaAlmadén 13400Spain

This study investigates the development of novel montmorillonite/castor oil blends to formulate sustainable lubricating greases to promote the replacement of petrochemicals industry-derived materials by substances obtained from renewable ***,the effect of the thickener concentration on the rheological,chemical,thermal,tribological properties,and atomic force microscopy(AFM)microstructure of these systems were *** results showed that the C20A nanoclay content could be used to modulate the viscosity values,the linear viscoelastic functions,and tribological properties of these montmorillonite *** general,these gel-like dispersions exhibited remarkable lubricant properties;the samples showed values of the friction coefficient and wear scars similar or lower than those obtained with model bentonite grease.

关键词： lubricating greases nanoclay vegetable oil rheology tribology

An efficient method for the n-arylation of phenylurea via copper catalyzed amidation

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第6期22卷 675-678页

作者： Sandip n.Gavade Ravi S.Balaskar Madhav S.Mane Pramod n.Pabrekar Murlidhar S.Shingare Dhananjay V.Mane Organic Research Laboratory S.C.S.College Omerga-413 606MSIndia V.G.Vaze College Mulund(E) Mumbai-400081MSIndia Department of Chemistry Dr.Babasaheb Ambedkar Marathwada University

The coupling reaction of phenylurea with different functionalized aryl halides in the presence of air stable CuI,n,n-dimethylethylenediamine as a ligand,and K_3PO_4 as a base gives symmetrical and unsymmetrical diarylureas in relatively high *** method is milder than the palladium catalyzed arylation and avoids the use of toxic phosphine ligands.

关键词： Copper catalyst Urea Aryl halides Amidation

numerical simulation of the effect of the free carrier motilities on light-soaked a-Si:H p–i–n solar cell

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2015年第7期36卷 59-68页

作者： L.Ayat A.F.Bouhdjar AF.Meftah n.Sengouga Laboratory of Semiconductor Devices Physics Physics DepartmentUniversity of Béchar Faculté des Sciences de la matière Laboratoire des Matériaux Semi-conducteurs et MétalliquesUniversité Mohammed Khider

Using a previous model, which was developed to describe the light-induced creation ofthe defect density in the a-Si：H gap states, we present in this work a computer simulation of the a-Si：H p-i-n solar cell behavior under continuous illumination. We have considered the simple case of a monochromatic light beam nonuniformly absorbed. As a consequence of this light-absorption profile, the increase of the dangling bond density is assumed to be inhomogeneous over the intrinsic layer （i-layer）. We investigate the internal variable profiles during illumination to understand in more detail the changes resulting from the light-induced degradation effect. Changes in the cell external parameters including the open circuit voltage, Voc, the short circuit current density, Jsc, the fill factor, FF, and the maximum power density, Pmax, are also presented. This shows, in addition, the free carrier mobility influence. The obtained results show that Voc seems to be the less affected parameter by the light-induced increase of the dangling bond density. Moreover, its degradation is very weak-sensitive to the free carrier mobility. Finally, the free hole mobility effect is found to be more important than that of electrons in the improvement of the solar cell performance.

关键词： a-Si:H Staebler-Wronski effect defect pool model p-i-n

Remarks on “A new non-specificity measure in evidence theory based on belief intervals”

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2018年第3期31卷 529-533页

作者： Joaquín ABELLAn Department of Computer Science and Artificial Intelligence University of Granada

Two types of uncertainty co-exist in the theory of evidence： discord and *** 90s, many mathematical expressions have arisen to quantify these two parts in an *** important aspect of each measure presented is the verification of a coherent set of *** non-specificity, so far only one measure verifies an important set of those properties. Very recently, a new measure of non-specificity based on belief intervals has been presented as an alternative measure that quantifies a similar set of properties（Yang et al., 2016）. It is shown that the new measure really does not verify two of those important properties. Some errors have been found in their corresponding proofs in the original publication.

关键词： Additivity Imprecise probabilities non-specificity Subadditivity Theory of evidence Uncertainty measures

Study on Detection of negative Corona Discharge Generated in Rod-Plane Air Gap by Using External Electrode Method

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2007年第6期9卷 686-689页

作者： n.ICHIKAWA national Institute of Occupational Safety and Health(JnIOSH) Electrical Safety Research Group1-4-6UmezonoKiyoseTokyo 204-0024Japan

A detective method of a negative corona discharge by means of an external electrode is presented. The relationship between an area of the external electrode and a detected voltage waveform is examined experimentally. This experimental study is carried out with the use of a rod-plane air gap. The results obtained will be applicable to problems associated with silos, ducts, and high-voltage equipment.

关键词： external detection of corona discharges external electrode method (EEM),prevention of accidents

Absorption of laser radiation in ultracold plasma

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2016年第10期25卷 128-131页

作者： n Y Shaparev Institute of Computational Modeling Russian Academy of Sciences national Research Tomsk State University

In this paper, we analyze the spectral behavior(optical thickness, shape and linewidth) of laser radiation absorption under the correlation heating of ions in an ultracold plasma. The Voigt formula is used to find the absorption *** spectral line width is shown to grow with time while the optical thickness reduces. Our modeling results are in good agreement with the experimental findings reported in the literature.

关键词： absorption laser radiation ultracold plasma

Flicker and thermal noise in an n-channel underlap DG FinFET in a weak inversion region

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2013年第2期34卷 31-36页

作者： Sudhansu Kumar Pati Hemant Pardeshi Godwin Raj n Mohankumar Chandan Kumar Sarkar nano Device Simulation Laboratory Electronics and Telecommunication Engineering DepartmentJadavpur University SKP College of Engineering TiruvannamalaiTamilnadu-606 611India

We propose an analytical model for drain current and inversion charge in the subthreshold region for an underlap DG FinFET by using the minimum channel potential method, i.e., the virtual source. The flicker and thermal noise spectral density models are also developed using these charge and current models expression. The model is validated with already published experimental results of flicker noise for DG FinFETs. For an ultrathin body, the degradation of effective mobility and variation of the scattering parameter are considered. The effect of device parameters like gate length Lg and underlap length Lun on both flicker and thermal noise spectral densities are also analyzed. Increasing Lg and Lun, increases the effective gate length, which reduces drain current, resulting in decreased flicker and thermal noise density. A decrease of flicker noise is observed for an increase of frequency, which indicates that the device can be used for wide range of frequency applications.

关键词： flicker noise thermal noise ultrathin body virtual source underlap DG FinFET

On a Question of the Theory of Partially Composition Formations（Dedicated to Professor K.P. Shum on the occasion of his 70th birthday）

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2014年第3期21卷 437-447页

作者： A.A. Tsarev n.n. Vorob'ev Department of Mathematics P.M. Masherov Vitebsk State University Vitebsk 210038 Belarus Department of Mathematics F. Skorina Gomel State University Gomel' 246019 Belarus

Let n 〉 0 and w be a non-empty set of primes. It is proved that the lattice of all τ-closed n-multiply ω-composition formations is inductive. It gives a positive answer to a question of Skiba asked in 2001 at the G... 详细信息

关键词： finite group formation of groups ω-composition satellite of formation,τ -closed n-multiply ω-composition formation inductive lattice of formations

Secured Data Storage Using Deduplication in Cloud Computing Based on Elliptic Curve Cryptography

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

Computer Systems Science & Engineering 2022年第4期41卷 83-94页

作者： n.niyaz Ahamed n.Duraipandian Department of Computer Science and Engineering Velammal Engineering CollegeChennai600066India

The tremendous development of cloud computing with related technol-ogies is an unexpected ***,centralized cloud storage faces few chal-lenges such as latency,storage,and packet drop in the *** storage gets more attention due to its huge data storage and ensures the security of secret *** of the developments in cloud storage have been positive except better cost model and effectiveness,but still data leakage in security are billion-dollar questions to *** data security techniques are usually based on cryptographic methods,but these approaches may not be able to with-stand an attack from the cloud server's ***,we suggest a model called multi-layer storage(MLS)based on security using elliptical curve cryptography(ECC).The suggested model focuses on the signiﬁcance of cloud storage along with data protection and removing duplicates at the initial *** on divide and combine methodologies,the data are divided into three ***,theﬁrst two portions of data are stored in the local system and fog nodes to secure the data using the encoding and decoding *** other part of the encrypted data is saved in the *** viability of our model has been tested by research in terms of safety measures and test evaluation,and it is truly a powerful comple-ment to existing methods in cloud storage.

关键词： Cloud storage deduplication fog computing and elliptic curve cryptography