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Search Results: 1 - 10 of 104204 matches for " Heyi Zhang "
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New factorization algorithm based on a continuous representation of truncated Gauss sums
Vincenzo Tamma,Heyi Zhang,Xuehua He,Augusto Garuccio,Yanhua Shih
Physics , 2008, DOI: 10.1080/09500340903254700
Abstract: In this paper, we will describe a new factorization algorithm based on the continuous representation of Gauss sums, generalizable to orders j>2. Such an algorithm allows one, for the first time, to find all the factors of a number N in a single run without precalculating the ratio N/l, where l are all the possible trial factors. Continuous truncated exponential sums turn out to be a powerful tool for distinguishing factors from non-factors (we also suggest, with regard to this topic, to read an interesting paper by S. Woelk et al. also published in this issue [Woelk, Feiler, Schleich, J. Mod. Opt. in press]) and factorizing different numbers at the same time. We will also describe two possible M-path optical interferometers, which can be used to experimentally realize this algorithm: a liquid crystal grating and a generalized symmetric Michelson interferometer.
HIGH EFFICIENCY KNbO_3:Fe SELF-PUMPED PHASE CONJUGATOR
高效率kNbO3:Fe自泵浦相位共轭器

WANG WEILI,ZHENG TINJUN,WANG DEHANG,ZHANG HEYI,RANG QINGIAN,
王威礼
,沈德忠

红外与毫米波学报 , 1991,
Abstract: The design and consideration of an optical coherent two-wave coupling and a self-pumped phase conjugator using totally internal reflection in the photorefractive KNbO_3: Fe are reported. The exceptionally large value of the electro-optical coefficient r_(42) and an optimized geometrical configuration are considered for both cases. The nature of phase conjugation of the retroreflected beam ls demonstrated. Nonlinear optical effects are extended successfully from wavelengths 514.5nm to 632.8nm.
ENHANCED EFFECT OF TWO-BEAM COUPLING IN INFRARED PHOTOREFRACTIVE GaAs UNDER EXTERNAL ELECTRIC FIELD
外电场作用下红外光折变GaAs的双光束耦合增强效应

WANG WEILI,WANG DEHUANG,RANG QINGLAN,ZHANG HEYI,
王威礼
,王德煌

红外与毫米波学报 , 1991,
Abstract: The enhanced infrared photorefractive effect in cubic crystal GaAs under externally applied electric field is described. The spatial amplitude and phase variations of space charge electric field in the two-beam coupling process are emphatically analyzed, which quite well explain the results of experimental measurement
GRAPHITE NODULAR PHENOMENA DURING THE ESR OF CAST IRON
灰铸铁电渣重熔过程石墨球化现象的研究

CHU Shaojun,LIU Haihong,ZHANG Heyi Correspondent: CHU Shaojun,associate professor,Tel:,Fax:,
储少军
,刘海洪,张合义

金属学报 , 1998,
Abstract: Based on the principles of the electrochemical modifying treatment for molten cast iron, preparing ductile iron in ESR process tinder D.C. condition without adding spheroidizing inoculant alloys has been studied in laboratory. The key operation of ESR for producing ductile iron is to increase the silicon content of consumable grey iron electrode and use CaF2-based slags containing rare-earth chide or alkaline-earth oxide and magenisium fluoride. Under the condition of D.C. reversed polarity, the anodic corrosion reaction silicon at the consumable electrode tip leads to a decrease of ferrous oxide concentrationin molten slag, therefore, the cathodic reduction of magnesium canon or cerium cation at the interface between slag and metal pool happens easily.A small amout of nodulizing element such as Mg and Ce, being transferred from slag into metal pool make graphite spheroidizing in remelted ingot. This new method of producing ductile iron in ESR process seems to be useful for the development of new metallurgical technology.
Preparation of Superhydrophobic Polymeric Film on Aluminum Plates by Electrochemical Polymerization
Fang Wang,Heyi Luo,Qian Wang,Jinggang Wang,Juan Xu
Molecules , 2009, DOI: 10.3390/molecules14114737
Abstract: 6-(N-Allyl-1,1,2,2-tetrahydroperfluorododecyl)amino-1,3,5-triazine-2,4-dithiol monosodium (ATP) was used to prepare polymeric thin films on pure aluminum plates to achieve a superhydrophobic surface. The electrochemical polymerization process of ATP on aluminum plates in NaNO2 aqueous solution and the formation of poly(6-(N-allyl-1,1,2,2-tetrahydroperfluorododecyl)amino-1,3,5-triazine-2,4-dithiol) (PATP) thin film were studied by means of optical ellipsometry and film weight. The chemical structure of the polymeric film is investigated using FT-IR spectra and X-ray photoelectron spectroscopy (XPS). Contact angle goniometry was applied to measure the contact angles with distilled water drops at ambient temperature. The experimental results indicate that the polymeric film formed on pure aluminum plates exhibits superhydrophobic properties with a distilled water contact angle of 153°. The electrochemical polymerization process is time-saving, inexpensive, environmentally friendly and fairly convenient to carry out. It is expected that this technique will advance the production of superhydrophobic materials with new applications on a large scale. Moreover, this kind of polymeric thin film can be used as a dielectric material due to its insulating features.
A New Organofunctional Ethoxysilane Self-Assembly Monolayer for Promoting Adhesion of Rubber to Aluminum
Fang Wang,Juan Xu,Heyi Luo,Jinggang Wang,Qian Wang
Molecules , 2009, DOI: 10.3390/molecules14104087
Abstract: Practical adhesion of rubber to aluminum is measured for various aluminum silanization treatments. In this study, 6-(3-triethoxysilylpropylamino)-1,3,5-triazine-2,4-dithiol (TES) was used as the coupling agent for preparing self-assembly monolayers (SAMs) on an aluminum surface. The structure and chemical composition of the SAMs were analyzed using Fourier transform infra-red spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The changes in the surface features of the aluminum surface due to TES treatment were investigated by atomic force microscopy (AFM). The adhesive properties of the silanized aluminum surface and EPDM rubber have been evaluated by a T-peel strength test. The results suggested that the Si-O-Al bonding at aluminum TES interface existed and a TES self-assembly monolayer was formed on the aluminum surface. More than 6.0 KN/m adhesion strength is obtained when the aluminum is silanized with 2.5 mmol/dm3 TES, cured at 160 °C and vulcanized with EPDM rubber at 160 °C for 30 min. It is suggested that the TES self-assembly monolayer is bound to aluminum through its ethoxysilyl functional group, and the thiol function group is strongly crosslinked to EPDM rubber, respectively.
THE BEHAVIOR OF THE CARBON IN THE SUBSTRATE DURING DEPOSITING DIAMOND FILM BY COMBUSTION FLAME
火焰法沉积金刚石薄膜过程中碳在基底中的行为

GUO Zhimeng,YIN Sheng,LAI Heyi,
郭志猛
,殷声,赖和怡

材料研究学报 , 1995,
Abstract: The diamond films were deposital on the Mo substrates by combustion name in air. The behavior of the carbon was investigated during depositing diamond films. The results show that firstlly the carbon atoms are absorbed on the surface of the substrate, secondlly the carbon atoms diffuse into the substrate and react with Mo to form Mo2C, finally the Mo2C layer becomes more thick with increasing time, then the diffusing rate of carbon atoms in the substrate becomes lower so that the diamond nucleation takes place because the carbon atoms is oversaturated.
Authentication Based on Multilayer Clustering in Ad Hoc Networks
Lee Keun-Ho,Han Sang-Bum,Suh Heyi-Sook,Lee Sang Keun
EURASIP Journal on Wireless Communications and Networking , 2005,
Abstract: In this paper, we describe a secure cluster-routing protocol based on a multilayer scheme in ad hoc networks. This work provides scalable, threshold authentication scheme in ad hoc networks. We present detailed security threats against ad hoc routing protocols, specifically examining cluster-based routing. Our proposed protocol, called "authentication based on multilayer clustering for ad hoc networks" (AMCAN), designs an end-to-end authentication protocol that relies on mutual trust between nodes in other clusters. The AMCAN strategy takes advantage of a multilayer architecture that is designed for an authentication protocol in a cluster head (CH) using a new concept of control cluster head (CCH) scheme. We propose an authentication protocol that uses certificates containing an asymmetric key and a multilayer architecture so that the CCH is achieved using the threshold scheme, thereby reducing the computational overhead and successfully defeating all identified attacks. We also use a more extensive area, such as a CCH, using an identification protocol to build a highly secure, highly available authentication service, which forms the core of our security framework.
Extreme rays of the $(N, k)$-Schur Cone
Christian Gaetz,Kyle Meyer,Ka Yu Tam,Max Wimberley,Zijian Yao,Heyi Zhu
Mathematics , 2014,
Abstract: We discuss several partial results towards proving Dennis White's conjecture on the extreme rays of the $(N,2)$-Schur cone. We are interested in which vectors are extreme in the cone generated by all products of Schur functions of partitions with $k$ or fewer parts. For the case where $k =2$, White conjectured that the extreme rays are obtained by excluding a certain family of "bad pairs," and proved a special case of the conjecture using Farkas' Lemma. We present an alternate proof of the special case, in addition to showing more infinite families of extreme rays and reducing White's conjecture to two simpler conjectures.
SOL-GEL DERIVED SILICA COATING ON CARBON FIBERS
用 Sol—Gel 法制备碳纤维的 SiO_2涂层

LI Hualun MAO Zhiying PENG Heyi SHANG Baolu,
李华伦
,毛志英,彭和宜,商宝禄

材料研究学报 , 1991,
Abstract: This paper presents a method of carbon fiber coating with silica fromsol-gel process.Carbon fibers are passed through hydrolytic solution of tetraethoxysiliane(TEOS).which then chemically converted by drying and pyrolysis to form silica coating.The coating was characterized from its morphology,constitution and behavior in C/Mgcomposites fabricated by liduid infiltraion.
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