Analysis of Multichannel ALOHA and CSMA Protocols－Normal and Slotted Versions

ＡｎａｌｙｓｉｓｏｆＭｕｌｔｉｃｈａｎｎｅｌＡＬＯＨＡａｎｄＣＳＭＡＰｒｏｔｏｃｏｌｓ－ＮｏｒｍａｌａｎｄＳｌｏｔｔｅｄＶｅｒｓｉｏｎｓＬＩＹｉｎｇｔａｏ；ＨＡＯＣｈｕａｎ；ＺＨＡＮＧＮａｉｔｏｎｇ（李英涛）（郝川）（张乃通）（Ｄｅｐｔ．ｏｆＣｏｍｍ...     

ZHONGGUO KUANGYE DAXUE XUEBAO General Contents of 2002 Issues

Ｖｏｌ.1 2　Ｎｏ .1Ｊｕｎ .2 0 0 2　　ＳｏｕｒｃｅＲｏｃｋＣｌａｓｓｉｆｉｃａｔｉｏｎａｎｄｔｈｅＢａｓｉｃＳｔｒｕｃｔｕｒｅｏｆＣｏａｌａｎｄＫｅｒｏｇｅｎＪＩＮＫｕｉ ｌｉ,ＹＡＮＬｕ ｗｕ　 (1)………………………………………………………………………………………………ＣｏｍｐｕｔｅｒＰｒｏｇｒａｍｓｆｏｒＰｒｅｄｉｃｔｉｏｎｏｆＭｉｎｉｎｇＡｒｅａＤｅｆｏｒｍａｔｉｏｎｗｉｔｈＴｉｍｅＦａｃｔｏｒＴａｋｅｎｉｎｔｏＣｏｎｓｉｄｅｒａｔｉｏｎＢＩＡＬＥＫＪａｎ　 (6)…………………………………………     

The computer code "dynamics of crystal lattice

Ｏｎｅｏｆｔｈｅａｃｔｕａｌｐｒｏｂｌｅｍｓｉｎａｓｏｌｉｄ -ｓｔａｔｅｐｈｙｓｉｃｓｉｓｎｕｍｅｒｉｃａｌｃａｌｃｕｌａｔｉｏｎｓｏｆｐｈｙｓｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｓｏｌｉｄｓ .Ｉｎｔｈｉｓｗｏｒｋｗｅｐｒｅｓｅｎｔｔｈｅｃｏｍｐｕｔｅｒｃｏｄｅ″Ｄｙｎａｍ ｉｃｓｏｆｃｒｙｓｔａｌｌａｔｔｉｃｅ″ .Ｔｈｉｓｃｏｍｐｕｔｅｒｃｏｄｅｉｓｄｅｖｏｔｅｄｔｏｔｈｅｎｕｍｅｒｉｃａｌｃａｌｃｕｌａｔｉｏｎｓｏｆｂａｓｉｃｐｈｙｓｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｃｒｙｓｔａｌ.Ｔｈｅｐｒｉｍａ…     

ELECTRODE SELECTION OF ELECTROLYSIS WITH MEMBRANE FOR SODIUM TUNGSTATE SOLUTION

Ｅｌｅｃｔｒｏｄｅｍａｔｅｒｉａｌ,ｅｓｐｅｃｉａｌｌｙａｎｏｄｅｍａｔｅｒｉａｌ,ｉｓａｄｅｃｉｓｉｖｅｆａｃｔｏｒｆｏｒｔｈｅｓｕｃｃｅｓｓｏｆａｎｅｌｅｃｔｒｏｌｙｓｉｓｔｅｃｈｎｏｌｏｇｉｃａｌｐｒｏｃｅｓｓ．Ｉｔｓｓｕｐｅｒｐｏｔｅｎｔｉａｌｖａｌｕｅｉｓｄｉｒｅｃｔｌｙｒｅｌａｔｅｄｔｏｔｈｅｅｎｅｒｇｙｃｏｎｓｕｍｐｔｉｏｎｏｆｄｉｒｅｃｔｃｕｒｒｅｎｔｉｎｔｈｅｅｌｅｃｔｒｏｌｙｓｉｓｐｒｏｃｅｓｓ．Ｉｔｓｌｉｆｅｓｐａｎｉｓｔｈｅｋｅｙｉｎｔｈｅｉｎｄｕｓｔｒｉａｌｉｚａｔｉ…     

Biocompatibility evaluation in vitro. Part II: Functional expression of human and animal osteoblasts on the biomaterials

ＣｅｌｌｕｌａｒＤＮＡｓｙｎｔｈｅｓｉｓｏｎｔｈｅｏｒｔｈｏｐａｅｄｉｃｍａｔｅｒｉａｌｓｉｓｅｓｓｅｎｔｉａｌ,ｓｔａｎｄｉｎｇｆｏｒｃｅｌｌｐｒｏｌｉｆｅｒａ ｔｉｏｎａｂｉｌｉｔｙａｎｄｔｈｅａｆｆｉｎｉｔｙｂｅｔｗｅｅｎｉｍｐｌａｎｔａｎｄｓｕｒｒｏｕｎｄｉｎｇｔｉｓｓｕｅ .Ｃｏｌｌａｇｅｎｓｙｎｔｈｅｓｉｓｉｓｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｆｕｎｃｔｉｏｎｏｆｔｈｅｏｓｔｅｏｂｌａｓｔ ｌｉｋｅｃｅｌｌｓ .Ｔｈｅｓｕｃｃｅｓｓｆｕｌｓｙｎｔｈｅｓｉｓｏｆｃｏｌｌａｇｅｎｐｒｏｔｅｉｎｏ…     

Study on polygon region filling method

Ａｂａｓｉｃｐｒｏｂｌｅｍｉｎｃｏｍｐｕｔｅｒｇｒａｐｈｉｃｓｉｓｔｈａｔｗｈｅｎｔｈｅｏｕｔｌｉｎｅｏｆａｒｅｇｉｏｎｈａｓｂｅｅｎｇｉｖｅｎ,ｙｏｕｈａｖｅｔｏｆｉｎｄｔｈｅｉｎｎｅｒｐａｒｔｏｆｔｈｅｒｅｇｉｏｎ,ｉ.ｅ.ｒｅｇｉｏｎｆｉｌｌｉｎｇ.Ｔｈｅｒｅａｒｅｔｗｏｋｉｎｄｓｏｆｍｅｔｈｏｄｓｔｏｒｅｓｏｌｖｅｔｈｅｐｒｏｂｌｅｍ.Ｔｈｅｆｉｒｓｔｉｓｔｏｄｅｔｅｒｍｉｎｅｗｈｉｃｈｐａｒｔｏｆｔｈｅｐｌａｎｅｉｓｉｎｓｉｄｅｒｅｇｉｏｎａｃｃｏｒｄｉｎｇｔｏａｎａｌｙｓｉｓｏｆｔｈｅｓｔ…     

REDUCTION OF FERRIC IRON IN THE TITANIUM SULFATE SOLUTION BY THE ION EXCHANGE MEMBRANE PRIMARY CELL METHOD *

Ｉｎｔｈｅｐｒｏｃｅｓｓｏｆｐｒｏｄｕｃｉｎｇｔｉｔａｎｉｕｍｄｉｏｘｉｄｅｗｉｔｈｓｕｌｆｕｒｉｃａｃｉｄ,ｔｈｅｐＨｖａｌｕｅｓｏｆＦｅ３＋ｈｙｄｒｏｌｙｓｉｓａｎｄＴｉ４＋ｈｙｄｒｏｌｙｓｉｓａｒｅｖｅｒｙｃｌｏｓｅ．ＩｎｏｒｄｅｒｔｏｐｒｅｖｅｎｔＦｅ３＋ｉｎｔｈｅｌｅａｃｈｉｎｇｓｏｌｕｔｉｏｎｆｒｏｍｈｙｄｒｏｌｙｚｉｎｇｉｎｔｈｅｆｏｒｍｏｆｈｙｄｒｏｘｉｄｅｏｒｂａｓｉｃｓｕｌｆａｔｅｉｎｔｈｅｈｙｄｒｏｌｙｓｉｓｓｔａｇｅｏｆＴｉＯＳＯ４,ａｎｄｆｒｏｍｃｏｎｔａｍｉｎａｔｉｎ…     

Preparation of Ti_3SiC_2 with Aluminum by Means of Spark Plasma Sintering

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｉｔａｎｉｕｍｓｉｌｉｃｏｎｃａｒｂｉｄｅ (Ｔｉ3ＳｉＣ2 )ｉｓａｌａｙｅｒｅｄｈｅｘａｇｏｎａｌｍａｔｅｒｉａｌｗｈｅｒｅｉｎｅｖｅｒｙｔｈｒｅｅｌａｙｅｒｓｏｆｎｅａｒ ｃｌｏｓｅ ｐａｃｋｅｄｌａｙｅｒｓｏｆＴｉａｒｅｓｅｐａｒａｔｅｄｂｙａｌａｙｅｒｏｆｐｕｒｅＳｉ,ｔｈｅＣａｔｏｍｏｃｃｕｐｉｅｓａｌｌｔｈｅｏｃｔａｈｅｄｒａｌｓｉｔｅｓｂｅｔｗｅｅｎｔｈｅＴｉａｔｏｍｓ[1,2 ] .Ｔｉ3ＳｉＣ2 ｈａｓａｎｕｍｂｅｒｏｆｅｘｃｅｐｔｉｏｎａｌｐｒｏｐｅｒｔｉｅｓ[3- 8…     

To a problem of rising data processing rate on magnetic carriers

0　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｄｅｖｅｌｏｐｍｅｎｔｄｙｎａｍｉｃｓｏｆｅｌｅｍｅｎｔｂａｓｉｓｆｏｒｃｏｍ ｐｕｔｅｒｔｅｃｈｎｏｌｏｇｙｄｉｓｐｌａｙｓ ,ｔｈａｔｓｉｎｃｅ 196 5ｔｈｅｎｕｍｂｅｒｏｆｓｅｍｉｃｏｎｄｕｃｔｏｒｔｒａｎｓｉｓｔｏｒｓｉｎｍｉｃｒｏｐｒｏｃｅｓｓｏｒｓｉｓｄｏｕｂｌｉｎｇｉｎｔｗｏｙｅａｒｓ .Ｔｈｕｓ ,ａｃｔｕａｌｌｙｔｈｅｓｐｅｅｄｏｆｐｒｏｃｅｓｓｏｒｓｎｏｗａ ｄａｙｓｗｉｌｌｃｌｏｓｅｌｙｃｏｍｅｎｅａｒｅｒｔｏｐｈｙｓｉｃａｌｔｈｒｅｓｈｏｌｄ ,ｄｅ…     

The Mechanism of Sol-Gel Synthesis of Normal Spinel LiMn_2O_4 with Chelation of Citric Acid

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｔｒａｄｉｔｉｏｎａｌｓｏｌ ｇｅｌｍｅｔｈｏｄａｎｄｃｏ ｐｒｅｃｉｐｉｔａｔｉｏｎｐｒｏｃｅｓｓ,ｗｈｉｃｈａｒｅｅａｓｙｔｏｃａｕｓｅｅｘｃｓｏｌｕｔｉｏｎａｎｄｓｅｇｒｅｇａ ｔｉｏｎｗｈｅｎｈｅａｔｉｎｇ ,ａｒｅｎｏｔａｌｗａｙｓｅｆｆｅｃｔｉｖｅｏｎｍａｉｎｔａｉｎｉｎｇａｈｏｍｏｇｅｎｏｕｓｄｉｓｔｒｉｂｕｔｉｏｎｏｆｐｒｅｃｕｒｓｏｒ .Ａｓａｒｅｓｕｌｔ,ｕｎｄｅ ｓｉｒａｂｌｅｐｈａｓｅｓｆｏｒｍｄｕｒｉｎｇｔｈｅｐｒｏｃｅｓｓｏｆｃａｌｃｉｎａｔｉ…     

Preparation of Poly （ethylene oxide） （PEO） Modified Tungsten Oxide Hybrid Films via Sol-Gel Processing

Poly ( ethylene axide ) ( PEO ) modified WO3 thin films were prepared on glass substrates with special temperature. The sol-gel transition proess was #westigated by using DTA - TG , SEM and XRD. The elec-trochemical characteristic of the films was studied by cyclic voltmmetry measurement. The results show that PEO has heavy effects on the crystallization of W03 during structure evolution because of the interaction between PEO and WO3. It increases the crystallization temperature of the gels and thus improves the electrochemical properties and cyclic life of WO3 film as electrochromic materials.     

掺杂PEO的WO3电致变色薄膜的研究

通过沈胶－凝胶方法,采用正交设计研究制备出了掺杂PEO的WO3电致变色薄膜,并利用电化学循环伏安装置、分光光度计、X－Ray衍射进行了相关的性能测试,指出掺杂一定量的PEO可使氧化钨薄膜离子、电子传导率加快,薄膜响应速度加快,同时也使薄膜的变色性能提高。     

Electrochemical Properties of Poly(ethylene oxide )(PEO) Doped TiO_2-PEO Films Prepared by Sol-gel Dip Coating Technique

PEO modified Ti02 -PEO organic-inorganic hybrid thin films were prepared via, sol-gel dipping process on glass substrate pre-coated with ITO. The preparation parameters were studied. Electrochemical and optical properties of the films were characterized by cyclic voltammetric response and visible transmittance. X-ray diffraction (XRD) was used to determined the crystalline structure of the gel. The results show the sols added with PEO have acceptable stable periods for practical use. The PEO modified optical transitivity of the hybrid films has heavy effects on the crystallization of TiO2 during structural evolution because of the interaction between PEO and Ti02 . PEO-TiO2 films have better electrochemical activity than the TiO2 equivalent behaved as higher Li insertion/extraction current density and cyclic reversibility.     

溶胶-凝胶法制备WO3-TiO2电致变色薄膜的研究

通过溶胶 -凝胶方法制备出了掺杂 Ti O2 的 WO3电致变色薄膜 ,并利用电化学循环伏安装置、分光光度计、X- Ray衍射进行了相关的性能测试 ,指出掺杂一定量的 Ti O2 可有效地稳定氧化钨溶胶 ,提高薄膜的循环使用寿命 ,同时也使薄膜的变色性能降低     

不同热处理工艺制备WO3电致变色薄膜及性能研究

采用溶胶凝胶-钨粉过氧化法制备了氧化钨电致变色薄膜,并对其进行了不同温度的热处理,通过对电致变色原理的分析,研究讨论了不同热处理工艺对氧化钨薄膜微观形貌和电致变色性能的影响.采用X射线衍射、扫描电子显微镜、紫外-可见分光光度计、电化学工作站对薄膜的微观结构、离子储存、离子扩散速率和光谱调制能力进行了表征和分析.结果表明：适当的热处理温度可以形成较低缺陷的非晶薄膜,此时薄膜具有优越的离子储存和扩散能力,从而具有较大的可见光调节范围;热处理温度为300,℃时,薄膜表现出较好的电致变色性能.     

Lithium Insertion in Poly(ethylene oxide)/MoO_3 Xerogel Nanocomposite Films

1　ＩｎｔｒｏｄｕｃｔｉｏｎＧｒｅａｔｅｆｆｏｒｔｓｈａｖｅｂｅｅｎｍａｄｅｉｎｒｅｃｅｎｔｙｅａｒｓｔｏｄｅ ｖｅｌｏｐｎｅｗｉｎｔｅｒｃａｌａｔｉｏｎｈｏｓｔ ｇｕｅｓｔｃｏｍｐｏｕｎｄｓｗｉｔｈｎｏｖｅｌｐｒｏｐｅｒｔｉｅｓａｓｍａｔｅｒｉａｌｓｆｏｒｅｌｅｃｔｒｏｃｈｒｏｍｉｃｄｅｖｉｃｅｓａｎｄｓｅｃ ｏｎｄａｒｙｌｉｔｈｉｕｍｂａｔｔｅｒｉｅｓ[1- 4] .ＣｏｍｐｏｕｎｄｓｂａｓｅｄｏｎＭｏＯ3 ｈａｖｅａｔｔｒａｃｔｅｄｍｏｒｅａｔｔｅｎｔｉｏｎｄｕｅｔｏｔｈｅｉｒｄｅｓｉｒａｂｌｅｃｈａｒ…     

热处理对聚甲醛/聚氧化乙烯共混材料结晶行为和力学性能的影响

在聚甲醛(POM)/聚氧化乙烯(PEO)共混改性材料的成型加工过程中,采用了3种不同的热处理方法来改变共混材料的结晶形为,并且分析了对力学性能的影响.结果表明:共混材料在POM结晶温度下保温2h,然后在PEO结晶温度下保温2 h,共混材料中POM的结晶度最大,PEO没有结晶,POM和PEO之间的分子作用力增强,有利于吸收能量增加韧性,因此可以获得综合力学性能良好的POM/PEO共混材料.     

(Ba,Sr)WO4薄膜室温电化学制备

采用恒电流技术，在室温条件下，金属钨片上制备了白钨矿结构的BaSrWO4晶态薄膜，电化学反应的工艺条件：电流密度为1mA/cm^3、电解液的pH值为12.5；电化学处理时间为1.5h；XRD，XPS,SEM分析结果表明，制备的（Ba,Sr)WO4薄膜为表面均匀致密的四方晶系单相薄膜。     

Preparation of LiNbO_3 films on Si(111) substrates by a modified sol-gel process

0　ＩＮＴＲＯＤＵＣＴＩＯＮＬｉＮｂＯ3ｉｓａｎｅｘｃｅｌｌｅｎｔｆｅｒｒｏｅｌｅｃｔｒｉｃｍａｔｅｒｉａｌ.Ｎｕｍｅｒ ｏｕｓａｔｔｅｍｐｔｓｈａｖｅｂｅｅｎｍａｄｅｏｎｔｈｅｄｅｐｏｓｉｔｉｏｎｏｆｔｈｉｎｆｉｌｍｓｏｆＬｉＮｂＯ3ｔｈｒｏｕｇｈｄｉｆｆｅｒｅｎｔｔｅｃｈｎｉｑｕｅｓ[1～ 3] .Ｉｎｏｒ ｄｅｒｔｏｃｏｍｂｉｎｅｔｈｅｏｐｔｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆＬｉＮｂＯ3ｗｉｔｈｔｈｅｅｌｅｃｔｒｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｓｉｌｉｃｏｎ ,ｉｔｉｓｏｆｇｒｅａｔｉｍｐｏｒｔａｎｃｅｔｏ…     

Lithium Instertion in poly (ethylene oxide )/MoO3 Xerogel Nanocomposite Films

The nanocomposite films were prepared by direct intercalation of poly (ethylene oxide) and PEO into MoO3 xerogel via sol-gel route,The electrochromic behavior and the chemical conditionws of Li^ ions were investigated by cyclic voltammograms,UV-visible spectral transmittance and XPS,The tesults show that the cycling efficiency and the reversibility of insertion/extraciton of Li^ ions in (PEO)1 MoO3 .nH2O nanocomposite film were improved.The intercalation of PEO into MoO3 xerogel modulated the wavelength range of electrochromism and enhanced the electrochromic efficiney,Two different chemical conditions of Li^ ions existing in the interlayer and interstitial positions of MoO3 lattice were observed in MoO3 XEROGEL AND (PEO)1 MoO3.nH2O naocomposite films.