Physical Sciences and Mathematics Commons^™

Statistical Image Analysis Of Spotted Arrays, Filippo Posta

Theses

There is a lot of systematic and specific variability in microarray experiments, this variability affects measured gene expression levels, leading to unreliable gene profiling or an heavy load of extra experiment to statistically confirm the data observed in one experiment.

The aim of this work is to systematically analyze, using statistics, the image derived from a cDNA microarray experiment to have a better understanding of this variability and thus a better confidence over the data obtained from an experiment.

Using technologies available at the Center for Applied Genomics, Newark, New Jersey. Selected images derived from different type of microarray experiments …

Semiparametric Regression Analysis On Longitudinal Pattern Of Recurrent Gap Times, Ying Qing Chen, Mei-Cheng Wang, Yijian Huang

U.C. Berkeley Division of Biostatistics Working Paper Series

In longitudinal studies, individual subjects may experience recurrent events of the same type over a relatively long period of time. The longitudinal pattern of the gaps between the successive recurrent events is often of great research interest. In this article, the probability structure of the recurrent gap times is first explored in the presence of censoring. According to the discovered structure, we introduce the proportional reverse-time hazards models with unspecified baseline functions to accommodate heterogeneous individual underlying distributions, when the ongitudinal pattern parameter is of main interest. Inference procedures are proposed and studied by way of proper riskset construction. The …

Modeling Corrosion In Oxygen Controlled Lbe Systems With Coupling Of Chemical Kinetics And Hydrodynamics-Task V: Final Report -Phase I 09/01/2001-08/30/2002, Samir Moujaes, Yitung Chen

Transmutation Sciences Materials (TRP)

The Lead-Bismuth eutectic (LBE) has been determined from previous experimental studies by the Russians and the European scientific community to be a potential material that can be used as a spallation target and coolant for the AAA proposed application. Properly controlling the oxygen content in LBE can drastically reduce the LBE corrosion to structural steels. However, existing knowledge of material corrosion performance was obtained from point-wise testing with only very sparse experimental data. Scientists have noticed that the concentration of oxygen dissolved in the liquid alloy could control the corrosion rate of steels exposed to Pb or Pb-Bi. At high …

Analysis For Cooperative Behavior Effectiveness Of Autonomous Wide Area Search Munitions, Sang M. Park

Theses and Dissertations

The purpose of this study is to investigate how a simulation model can accurately represent the performance of the autonomous wide area search munitions, and to find the effectiveness of the cooperative behavior on the autonomous munitions. Though it does not provide a practical solution for the development of the autonomous wide area search munitions, this research will show some meaningful allocations of the munitions tasks that are applicable to the development of the autonomous munitions. For the first phase, this thesis presents how accurately a simplified simulation model can represent a proposed weapon system by comparing the simulation results …

Narendra Jaggi, Charlie Schlenker

Interviews for WGLT

Charlie Schlenker interviews Professor of Physics Narendra Jaggi about his work with computer modeling of ethnic living choices. (requires RealPlayer)

A False Planet Around Hd 192263, Gregory W. Henry, Robert A. Donahue, Sallie L. Baliunas

Information Systems and Engineering Management Research Publications

We present new high-precision Strömgren photometry and Ca II H and K spectrophotometry of HD 192263. Based on radial velocity variations detected previously by two groups, this K2 V star was thought to host a 0.75 MJup (minimum mass) planetary companion in a 24 day orbit. Our photometric observations reveal periodic variations that match the purported planetary orbital period, while the Ca II H and K emission fluxes are modulated on half the planetary period. This suggests that rotational modulation of the visibility of stellar surface activity is the source of the observed radial velocity variations. Therefore, HD 192263 should …

Modification Of Molybdenum Nitride Electrode For Supercapacitor(I)——The Effect Of Ammonium Vanadate On The Properties Of Molybdenum Nitride Electrode, Xue-Liang Li, Dao-Rong Luo, Hua-Lin Wang, Jian-Bo He, Yun-Guei Zhu

Journal of Electrochemistry

The effect of vanadium on the properties of the electrode of molybdenum nitride has been studied by using XRD?SEM and cyclic voltammetry.Modified molybdenum nitride was made as follow:films were coated by dipping titanium sheet in the solution containing different composition of molybdenum oxide,ammonium vanadate,ammonia,glycol and oxalic acid,and coated films are reacted with free ammonia.The results show that the specific capacitance of modified electrode was considerably increased and the operation voltage was broadened with the addition of ammonium vanadate in the dipping solution.The mechanism of these effects generated is the formation of new phase VOMoO 4 in the electrode of molybdenum …

Pure Hap Film Prepared By Direct Electrodepositing On Metallic Surface And Its Mechanism, Hao-Bing Hu, Chang-Jian Lin, Fei Chen, Ren Hu, Ming Guo

Journal of Electrochemistry

In controlling concentration of Ca 2+ and PO 4 3- in electrodeposition solution, the HAP film on Ti alloy has been deposited directly. Using XRD and SEM we have learned that prepared HAP is intact in crystal and equal in dimension. Thermodynamic calculation indicated that the HAP is easer formation of than that TCP of. With the XRD, SEM analyses and thermodynamic calculation, the electrodeposition mechanism has been discussed. It was proved that electrodepositon is a two_stage process and formation of HAP is a direct process from solution ions to HAP crystal without precursor.

Electrochemical Properties Of Nitrate Immobilized On Gold Electrodes With 2-Aminoethanethiol Sams, Ya-Ru Song, Hong Wu, Hui-Bo Shao

Journal of Electrochemistry

Nitrate reductase (NR) and phospholipids were immobilized on gold electrodes with 2_aminoethanethio(AET) SAMs. After Au/AET/NR and Au/AET/NR/lipid were soaked in pH 7 phosphate buffers for days,a pair of pre_reversible peak appeared at around 0.202 V and 0.149 V,respsctively, irregularly grew with soaking time in blank buffer.The cathodic peak current(i pcl )of Au/AET/NR system had linear relationship with scan rate between 0.02 and 0.5 V.s -1 ,while i pcl was proportional to V 1/2 in Au/AET/NR/lipid system.The direct electron transfer of enzyme electrodes was strongly affected by pH.Compared with Au/AET,NR exhibited a higher electrochemical activity in Au/AET/lipid system.

Research Progress On Electrode Material In All-Vanadium Redox Battery, Hua Li, Shou-Wen Chang, Chuan-Wei Yan

Journal of Electrochemistry

An all_vanadium redox flow storage battery possesses many advantages over conventional storage batteries.The development statue of two types electrode materials(metal and compound type)is introduced in this article.

Thionine-Glutathione Self-Assembly Monolayer Modified Electrdoe And The Quasi-Reversible Response Of Dopamine, Cheng Fang, Zheng Luan, Wu-Ming Zhang, Xing-Yao Zhou

Journal of Electrochemistry

Thionine was bound onto a glutathione monolayer self_assembled on the surface of a gold electrode previously, the electrochemical characteristics of which were studied. It was found that dopamine had a quasi_reversible response and cathodic characterstics peak could be used to determine the concentration of dopamine in the range of 1.0～300 μmol·L -1 in the presence of a higher concentration of ascorbic acid.

Study On Modification Of Spinel Limn_2o_4 By Overcoating, Ren-Gang Zhang, Shi-Xi Zhao, Jung-Lei Xia, Han-Xing Liu

Journal of Electrochemistry

The surface of spinel LiMn 2O 4 was modified by the sol_gel process with LiCoO 2_coated LiMn 2O 4 and studied by XRD,SEM and EPMA.The results have shown that the surface of the coated grains heated at 700 ℃ for 10h,which is cubic spinel,were Co_rich.The amount of Co 3+ in the grains changed owing to different place of the grain and decreased from surface to inner parts. Using the coated as the cathode of Li_ion cells,the initial capacity deceased slightly,but the amount of Mn 2+ solving in electrolyte decreased,Jahn_Teller effect was suppressed to a certain extent.The LiCoO 2_coated LiMn 2O …

The Performance And Heat Balance Of The Mcfc Stack With The Power Of 200 W, Hua-Xin Lin, Li Zhou, Bao-Lian Yi, Hua-Ming Zhang, Chang-Qin He

Journal of Electrochemistry

The output power of the MCFC stack was 217.6 W under reaction gas pressure,0.9 MPa/cm 2 and utilization of oxidant and fuel gas,20%.By calculation it was demonstrated that the heat balance state in the stack was kept at 300 mA/cm 2 under the utilization of fuel gas and oxidant,20%.The current density in heat balance state was higher than 100 mA/cm 2 under the utilization of air+CO 2 mixture gas as oxidant and H 2+CO 2 mixture gas as fuel gas,40% and 60% respectively.If the utilization was increased in the stack,the current density in heat balance state would be lowered.If the …

Some Consideration For Lithium-Ion Cells' Safety, Guang-Xia Hu, Jing-Ying Xie

Journal of Electrochemistry

The safety is the most important problem for lithium ion cells, especially for large lithium ion cells. In this paper, some information about lithium ion cells' safety can be learned by discussing several aspects of lithium ion cells, such as, materials of lithium ion cell , manufacturing processes, using conditions and so on.

Facilitated K~+ Ion Transfer By Db18c6 Across The Micro Liquid/Liquid Interface, Dong-Ping Zhan, Bing-Liang Wu

Journal of Electrochemistry

A novel microcavity Ag|AgCl electrode was fabricated to construct the micro_interface of two immiscible electrolyte solutions(ITIES). The transfer reactions of K + ion facilitated by DB18C6 across the water/1,2_DCE interface was investigated with the three_electrodes system. The corresponding reaction parameters were derived from the voltammetric data. The results showed that the microcavity electrode would be a useful and efficient tool to investigate the charge transfer reactions at ITIES.

Initial Stages Of Copper Electrodeposition On Glassy Carbon Electrode, Ling Huang, Rui Zhang, Min Gu, Fang-Zu Yang, Shu-Kai Xu, Shao-Min Zhou

Journal of Electrochemistry

Initial stages of copper electrodeposition on glassy carbon electrode from acid sulphate solutions were studied using cyclic voltammetry and chronoamperometry.The electrolyte solution was a 0.05 mol.L -1 copper sulphate,1.4～1.8 mol.L -1 sulphuric acid containing 1 mg.L -1 2_mercaptobenzoimidazole,Results show that 2_mercaptobenzoimidazole produced an inhibition of the copper deposition,probably related to the adsorption,sulphuric acid promote copper electrodeposition.The initial deposition kinetics corresponded to a model including instantaneous nucleation and diffusion controlled growth.Addition of 2_mercaptobenzoimidazole and sulphuric acid did not change the initial nucleation of copper electrocrystallization,it increased the nucleation rate and the number density of nuclei at the surface.

Synthesis And Characterization Of Lini_(0.8-X)Al_Xco_(0.2)O_2 As Cathodes For Lithium-Ion Batteries, Jun Zhang, Zhong-Kao Jin, Qing-He Yang, Qing-Mei Song, Xiao-Hua Ma, Xiang-Fu Zong

Journal of Electrochemistry

Single_phase solid solution of LiNi 0.8- x Al x Co 0.2 O 2 (0≤ x <0.1)had been synthesized and characterized by X_ray diffraction(XRD) and scanning electron microscopy (SEM). Their electrochemical performance was examined by charge_discharge cycling.The LiNi 0.71 Al 0.09 Co 0.2 O 2 compound showed a discharge capacity of 152 mAh/g after 20 cycles that corresponds to 97.4% capacity retention. The beneficial effect of co_doping with Al and Co elements was corro_borated by slow scanning cyclic voltammograms(SSCV),electrochemical impedance spectrum(EIS)and differential scanning calorimetry(DSC) data on charged cathodes. These results show that the 2D_character of the crystal lattice was stabilized by co_doping with Al and Co, the phase transitions that occur during deintercalation or intercalation of Li_ions were significantly suppressed,and thermal stability in the charged state was also improved.

Study On Hydrogen Evolution Performance Of Nickel-Tin Electrode, Tian-Yi Chang, Bao-Hong Zhang, Wenbo Cong, Yao Luo

Journal of Electrochemistry

The cathode active material with low hydrogen evolution overvoltage was prepared by electroplating Ni_Sn alloy on the ferrous basic body.This kind of material can be applied in the diaphragm type of electrolytic tank to decrease cell voltage and save energy.On the condition according with cathode solution in the electrolytic tank(NaOH 120 g/L,NaCl 190 g/L,90 ℃, i =150 mA/cm 2),the overvoltage of hydrogen evolution was 88 mV.By the X_ray diffraction analysis,it was found that the structure of this kind of material was different from that of Ni_Sn alloy applied in traditional decoration.By using CV method to analyse the Fe electrode and …

Ionic Conduction In Ba_(0.95)Ce_(0.9)Y_(0.1)O_(3-Α)Solid Oxide And Its Performance In Fuel Cell, Gui-Lin Ma, Ding-Xian Jia, Li-Gan Qiu, Hui Shi, Rong Chen

Journal of Electrochemistry

Using Ba 0.95 Ce 0.9 Y 0.1 O 3-α as a solid electrolyte and porous platinum as electrodes,hydrogen and oxygen concentration cells and hydrogen_air fuel cell were constructed,respectively.Electromotive forces(MEFs)of the gas concentration cells and I_V characteristics of the fuel cell were detdrmined in the temperature range of 600～1 000 ℃.The Ba 0.95 Ce 0.9 Y 0.1 O 3-α exhibited almost the pure protonic conduction under hydrogen gas,and a mixed conduction of oxide_ion and electron hole with oxide_ion transport number of 0.3～0.5 under oxygen gas.It exhibited a mixed conduction of proton and oxide_ion with the total ion transport number above 0.9 …

Electrochemical Techniques For Measuring Anti-Corrosion Behavior Of The Thin Corrosion Inhibitor Layer To The 907a Steel, Yong-Tao Zhao, Jian-Hua Wu, Fan-Cai Chen, Zhong-Ping Gao, Jia Wang, Chang-Jiu Zhao

Journal of Electrochemistry

The corrosion inhibiting behavior of 907A steel,which was covered with thin inhibitor layers in moist seawater atmosphere,was studied.The electrochemical measurements,including EIS method and the coulostatic method,were used to atmospheric corrosioed monitor(ACM)under thin inhibitor layers to determine its corrosion rate.The results shown that the application of electrochemical methods such as the coulostatic technique and EIS could readily detect the on going process of film formation. Hence, the rapid evaluation of the thin inhibitor layers for 907A steel might be possible.

Diffusion Of Hydrogen At Iron Apply For Electrochemical Oscillating Permeation, Li Zhang, Ren-He Yin, Zhan-Mei Sun

Journal of Electrochemistry

The diffusion of hydrogen in iron was measured using electrochemical oscillating permeation. Through the samples in the different frequencies, it was found that diffusion of hydrogen at iron is of linear relation with boundary condition, which is the key to Fick's diffusion equation amplitude in the liquor. We can exploit this line relation getting the diffusion of hydrogen at iron.

Xrd Study On Highly Preferred Orientation Cu Electrodeposit, Min Gu, Fang-Zu Yang, Ling Huang, Shi-Bing Yao, Shao-Min Zhou

Journal of Electrochemistry

Copper electrodeposit was obtained in CuSO 4+H 2SO 4 electrolyte solution by electrodeposition and its structure was studied by XRD.The results showed that copper electoddeposits with the highly preferred orientations of (220)and (111) could be obtained at current density 4.0 A/dm 2 and 15.0 A/dm 2,respectively. The texture coefficient ( TC ) values were increased by thickness of Cu deposits. The thickness would be, to obtain Cu electrodeposit with(111) highly preferred orientation,about 7 times of that of (220) highly preferred orientation, which indicated that(220) face was easier to be remained than (111)face and that electrocrystallization of Cu at low current …

Optimum Of Catalyst Layers For Direct Methanol Fuel Cells, Jun Zhang, Lei Li, Li Xu, Yu-Xin Wan

Journal of Electrochemistry

The performances of membrane electrode assemblies (MEAs)with various Pt loading were compared.The amount of Nafion in a catalytic layer was optimized,and the effect of Nafion loading on the resistance of MEAs was investigated with ac impedance spectroscopy.For a MEA with both Pt 4 mg/cm 2 in the anode and the cathode,suitable Nafion loading was 21.4 wt% in the anode.With 21.4 wt% Nafion loading in the cathode,the Direct Methanol Fuel Cells(DMFC) showed the highest performance at high current density.While,the DMFC performances came down,as Nafion loading increasing,for ohm and concentration polarization.

Electrochemical Degradation Of Organic Wastewater By Three-Dimensional Electrode Reactor, Chun He, Tai-Cheng An, Ya Xiong, Dong Shu, Hui-Ling Hu, Xi-Hai Zhu

Journal of Electrochemistry

The electrochemical degradation of aniline was investigated using a novel electrochemical reactor, three_dimensional electrode reactor. The experimental results indicated that the reactor could efficiently remove aniline. The removal efficiency could be attributed to a combination of direct and indirect electrochemical reactions,that is,anodic oxidation and oxidation of electrogenerated H 2O 2 and hydroxyl radicals generated in electro_Fenton process. It was also observed that the removal efficiency was significantly dependent on applied voltage,Fe 2+ concentration,pH value and electrolysis time. In the experimental range they all have a positive effect on the removal efficiency except for pH value. Furthermore,hydroxyl radicals generated in electro_Fenton …

Secure Authorization, Access Control And Data Integrity In Bluetooth, L. Nguyen, R. Safavi-Naini, Willy Susilo, Tadeusz A. Wysocki

Faculty of Informatics - Papers (Archive)

The Bluetooth standard has a provision for mutual authentication of connecting devices but not their actual users and allows access control during connection setup only. We propose a user authorization and pairing (UAP) application, that has the ability to perform authentication and authorization of users using role based model. The pairing procedure, which exchanges link key between devices, is also performed as a part of the user authorization process. The integrity of the message is guaranteed by using message authentication codes. We also extend an attack on a short PIN during the pairing procedure for devices compliant with the Bluetooth …

Securing Handheld Devices, Willy Susilo

Faculty of Informatics - Papers (Archive)

Handheld devices are becoming an indispensable part of everyday life. In this paper, we review the security of handheld devices, which are based on the Pocket PC operating system. We then identify the risks and threats of having these handheld devices connected to the Internet, and propose several methods to protect against the threats. We point out some advantages and security threats of porting server applications to handheld devices. We also consider the newest technology in mobile applications using the Microsoft's NET framework and provide the security risk analysis for it. We conclude the paper with an open problem.

Boron-Carbide And Boron Rich Rhobohedral Based Transistors And Tunnel Diodes, Peter A. Dowben

Peter Dowben Publications

The present invention relates to the fabrication of a boron carbide/boron semiconductor devices. The results suggest that with respect to the approximately 2 eV band gap pure boron material, 0.9 eV band gap boron carbide (B₅C) acts as a p-type material. Both boron and boron carbide (B₅C) thin films were fabricated from single source borane cage molecules using plasma enhanced chemical vapor deposition (PECVD). Epitaxial growth does not appear to be a requirement. We have doped boron carbide grown by plasma enhanced chemical vapor deposition. The source gas close- 1,2-dicarbadecaborane (orthocarborane) was used to grow the …

Direct Measurement Of The W Boson Decay Width, V. M. Abazov, Gregory R. Snow, D0 Collaboration

Gregory Snow Publications

Based on 85 pb^-1 data of pp̅ collisions at √s = 1.8 TeV collected using the DØ detector at Fermilab during the 1994–1995 run of the Tevatron, we present a direct measurement of the total decay width of the W boson Γ_W . The width is determined from the transverse mass spectrum in the W→e+ν _ℯ decay channel and found to be Γ_W=2.23_-0.14^+0.15 (stat) ±0.10(syst) GeV, consistent with the expectation from the standard model.

Little Venice Water Quality Monitoring Quarterly Reports #5, Ronald Jones, Joseph N. Boyer

SERC Research Reports

No abstract provided.

Baseline 2000 Background Report: The Status Of Integrated Coastal Management As An International Practice (Second Iteration), Jens Sorensen

Urban Harbors Institute Publications

The Coastal Zone Canada 2000 Conference occurred in Saint John, New Brunswick from September 17 to 22. All of the 600 registrants received a canvas packet that included four separately bound publications: the final conference program, the tradeshow program, Canadian Synopsis (a table of ICM efforts in Canada), and Baseline 2000.

The Coastal Zone Canada Association organized and administered the Conference as they had done for three previous Canadian based international CZ conferences (Victoria, British Columbia in 1998, Rimouski, Québec in 1996, and Halifax, Nova Scotia in 1994).

Two of the fundamental objectives of the Coastal Zone Canada Association (CZCA) …