Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

1999

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 781 - 810 of 2348

Full-Text Articles in Physical Sciences and Mathematics

Study On The Hydrogen Permeation Through Zinc Electrodeposit, Jiang-Li Cao, Ji-Xun Wu, Yan-Ping Lu, Jie Shi May 1999

Study On The Hydrogen Permeation Through Zinc Electrodeposit, Jiang-Li Cao, Ji-Xun Wu, Yan-Ping Lu, Jie Shi

Journal of Electrochemistry

The electrochemical hydrogen-permeation technique was used to study hydrogen permeation through zinc electrodeposit with bilayer specimens of Fe substrate/zinc electrodeposit. The effect of coating thickness on hydrogen diffusion coefficient and hydrogen steady-state flux was studied. The results showed that hydrogen diffusion coefficient was approximately in the range of 10-11 cm2·s-1 rank and zinc coating could retard hydrogen permeation. Accordingly, hydrogen steady-state flux and effective diffusion coefficient declined while the coating thickness increased.

Go to article

Xyz-2 High-Performance Electrochemical Suppressor For Ion Chromatography, Wei-Ling Hu, Hua-Shui Lin May 1999

Xyz-2 High-Performance Electrochemical Suppressor For Ion Chromatography, Wei-Ling Hu, Hua-Shui Lin

Journal of Electrochemistry

The packings of electrochemical suppressor on ion chromatography were studied. It was found that the best packing is the appropriately sulfonate globular resins uniform in size.Using these resins, suppression efficiency was improved to 99.98%,and sensitivity improves about 10%, the reproducibilities of both the height of ion peaks and retention time are very good (c.v<2).

Go to article

Preparation And Application Of Gold-Film On The Surface Of Bacterial-Modified Carbon Paste Electrode, Rong-Zong Hu, Yan-Ping Ruan, Hao Xu, Jin-Kun Fu, Wei-De Zhang, Wen-Yun Hu May 1999

Preparation And Application Of Gold-Film On The Surface Of Bacterial-Modified Carbon Paste Electrode, Rong-Zong Hu, Yan-Ping Ruan, Hao Xu, Jin-Kun Fu, Wei-De Zhang, Wen-Yun Hu

Journal of Electrochemistry

A novel method for preparation of gold-film composed of ultra-fine gold particles was reported in this paper. The gold-film was prepared by electrochemical method on the surface of the paste electrode modified with the strain Bacillus sp. D01 which has strong ability to absorb and reduce Au3+. In addition, this paper reported an experimental method of determining trace amount of Cu2+ in water solution using cathodic stripping analysis to estimate the performances of the obtained gold-film. The experimental results indicated that this new method for preparation of gold-film is simple. The obtained gold-film electrode is stable and …

Go to article

Electochemical Measuments Of Defective Coatingson Buried Steel Substrates, Shi-Zhe Song, Shi-Jiu Jin, Xiao-Ping Song, Yun-Hai Xu, Jian Li, Yu-Ping Liao, Guang-Sen Lai, Ling-Li Liu May 1999

Electochemical Measuments Of Defective Coatingson Buried Steel Substrates, Shi-Zhe Song, Shi-Jiu Jin, Xiao-Ping Song, Yun-Hai Xu, Jian Li, Yu-Ping Liao, Guang-Sen Lai, Ling-Li Liu

Journal of Electrochemistry

An electrochemical technique to detect the defects and detachments of the protective coating on the steel structures with electrochemical impedance spectroscopy (EIS) was offered. A new parameter K, which was defined as the ratio of the electrode resistance amplitude at a certain frequency to that at minimal frequency was obtained in present paper. The results indicated that the change of K at a certain range of frequency reflected the condition of protective coating. The technique was found to be very useful in estimating the different conditions of protective coating after being applied to the carbon steel samples covered with tar …

Go to article

The Adsorption Stability Of Interface Corrosion Inhibitor, Fu-Xing Gan, Di-Hua Wang, Jin-Yun Zou May 1999

The Adsorption Stability Of Interface Corrosion Inhibitor, Fu-Xing Gan, Di-Hua Wang, Jin-Yun Zou

Journal of Electrochemistry

Some new results on the adsorption stability of interface corrosion inhibitor are presented. The concept of adsorption stability and the factors influencing the adsorption stability were discussed. It is shown that the anodic desorption potential can be employed to evaluate the adsorption stability of the inhibitor as an empirical character in some conditions. Electrochemical oscillations phenomena were observed for the first time on a rotating iron electrode in H2SO4 solution containing organic inhibitor in the active potential region. These potentiostatic current oscillations can occur under cathodic polarization, as well as under anodic plarization. The oscillation period, amplitude, …

Go to article

The Behaviors Of Capacity Loss Of Limn2O4 Cathodeat Elevated Temperatures, Xiao-Hong Hu, Han-Xi Yang, Xin-Ping Ai, Sheng-Xian Li, Xin-Lin Hong May 1999

The Behaviors Of Capacity Loss Of Limn2O4 Cathodeat Elevated Temperatures, Xiao-Hong Hu, Han-Xi Yang, Xin-Ping Ai, Sheng-Xian Li, Xin-Lin Hong

Journal of Electrochemistry

The capacity loss of spinel LiMn2O4 cathode at elevated temperatures was evaluated by constant current charge-discharge methods and it was found that serious capacity loss and cycleability decrease occured at above 50, especially for the charged cells. The mechanisms for this phenomena were examined by atomic emission and infrared spectrometry of the electrolyte, XRD measurment of the cycled elecrode and microelectrode voltammetry of LiMn2O4 at room and elevated temperatures. The results showed that with increasing temperature, Mn and Li ions tended to redistribute partly in the spinel framework due to the disproportion of Mn …

Go to article

Effects Of Nickel Content And Simulated Heat Affected Zone Of 2205 Duplex Stainless Steel On Pitting Corrosion, Horng-Yih Liou, Ju-Tung Lee, Wen-Ta Tsai, Rong-Iuan Hsieh, Yeongtsuen Pan May 1999

Effects Of Nickel Content And Simulated Heat Affected Zone Of 2205 Duplex Stainless Steel On Pitting Corrosion, Horng-Yih Liou, Ju-Tung Lee, Wen-Ta Tsai, Rong-Iuan Hsieh, Yeongtsuen Pan

Journal of Electrochemistry

The effects of nickel content and Gleeble simulated heat affected zone (HAZ) of 2205 stainless steel on pitting corrosion were investigated in this paper. The results showed that nickel content, ranging from 4.5 wt% to 6.5 wt% in base metal, had only a minor effect on the electrochemical polarization curves, with all Enp's and Epp's falling in the rang of 1100~1200 mV. Comparing with the base metal, the simulated HAZ microstructure caused an increase in the anodic current density, a distinct decrease in both Enp and Epp , and a reduction in the passive …

Go to article

Investigation Of Solution Chemistry In Crevice Of Carbon Steel And Its Anodic Polarization Behavior, Zhuo Chen, Cui-Wei Du, Bei Cao, Yin-Shun Wu, Hai Yang, Zheng-Rong Zhang May 1999

Investigation Of Solution Chemistry In Crevice Of Carbon Steel And Its Anodic Polarization Behavior, Zhuo Chen, Cui-Wei Du, Bei Cao, Yin-Shun Wu, Hai Yang, Zheng-Rong Zhang

Journal of Electrochemistry

A self-made wedge-shaped simulated crevice apparatus was designed to investigate the solution chemistry in crevice of carbon steel and its anodic polarization behavior. For carbon steel with 3.5%(wt) NaCl, the change and the distribution of electrode potential, concentration of Cl- and pH value of solution in the crevice, and the current density of metal in the crevice were measured respectively under various conditions of anodic polarization. The results showed that without polarization the metal about 2 cm away from the opening of the crevice was attacked preferentially because of its lowest free corrosion potential. The anodic polarization promoted the …

Go to article

A Study On The Cathode Protection Potential Against Pitting Corrosion, Chun-Chun Xu, You-Ping Liu, Xiao-Bo Zhang, Xu-Hui Zhao May 1999

A Study On The Cathode Protection Potential Against Pitting Corrosion, Chun-Chun Xu, You-Ping Liu, Xiao-Bo Zhang, Xu-Hui Zhao

Journal of Electrochemistry

The methods have been developed to determine the protection potential against pitting corrosion. They are based on the theory that the pitting protection potential (Ep) is actually the transition potential of the direction of current between the occluded cell and the external surface (ET). ET lasts from -220 mV to -440 mV (SCE), the lowest of which can be considered as cathode protection potential. The Ep values determined with cyclic potentiodynamic polarization method is included in the ET with above methods.

Go to article

Zro2 And Zro2-Y2O3 Coatings Deposited By High Energy Pulse, Wei-Ping Yu, Ye-Dong He, Li-Na Zhang, De-Ren Wang May 1999

Zro2 And Zro2-Y2O3 Coatings Deposited By High Energy Pulse, Wei-Ping Yu, Ye-Dong He, Li-Na Zhang, De-Ren Wang

Journal of Electrochemistry

The basic rule and influence factors on deposition of ZrO2 and ZrO2-Y2O3 coatings by high energy pulse were studied. After the oxidizing experiment in air at 1 000 for 100 h, it was shown that the oxidation resistance of 18-8 stainless steel was marketly enhanced by depositing ZrO2 and ZrO2-Y2O3 coatings. The oxidation resistance was increased about 20 times and the oxide scale spallation resistance was increased about 100 times.

Go to article

Study On The Microband Array Electrode-Based Glucose Microsensor, Neng-Qin Jia, Chui-Jue Sun, Lin Gao, Zong-Rang Zhang, Jian-Zhong Zhu, Guo-Xiong Zhang May 1999

Study On The Microband Array Electrode-Based Glucose Microsensor, Neng-Qin Jia, Chui-Jue Sun, Lin Gao, Zong-Rang Zhang, Jian-Zhong Zhu, Guo-Xiong Zhang

Journal of Electrochemistry

The microband array electrode (MAE) consisting of 11 Pt microband of 5 m in wide, 2000 m long and 85 m gap was fabricated with a thin film techology. The MAE was characterized by means of cyclic voltammetry in a solution of K3Fe(CN)6 and H2O2. The results showed higher current density on MAE than on conventional Pt eletrode due to the strong edge effect of the former. A glucose microsensor was constructed with the substrate electrode of microband array. Microband array electrode was modified by Nafion followed by the immobilization of ferrocene onto …

Go to article

Some Electrochemical Studies On The Bionic Nereistoxin Pesticide-(Ch3)2Nhch(Ch2S2O3)2Na⋅H2O, Chang-Geng Zhang May 1999

Some Electrochemical Studies On The Bionic Nereistoxin Pesticide-(Ch3)2Nhch(Ch2S2O3)2Na⋅H2O, Chang-Geng Zhang

Journal of Electrochemistry

A study of cyclic voltammetric behavior of the nereistoxin pesticide known as Shachongdan is reported. The effects of scan rate, electrolyte pH, and concentration are discussed.The study shows that this electrode process is an irreversible electrode reaction. The saturate adsorption of dihydronereistoxin on the electrode is also discussed with the saturate adsorption amount of 8.23×10-10 mol/cm2.

Go to article

In Situ Ftir Spectroelectrochemical Study Of Palladium Hexacyanoferrate Thin Film Deposited On Glassy Carbon Electrode, Ai-Li Bo, Xiang-Qin Lin May 1999

In Situ Ftir Spectroelectrochemical Study Of Palladium Hexacyanoferrate Thin Film Deposited On Glassy Carbon Electrode, Ai-Li Bo, Xiang-Qin Lin

Journal of Electrochemistry

The electrochemically deposited Palladium hexacyanoferrate thin film on Glassy Carbon electrode (PdHCF|GC) has been studied in HCl, KCl and NaCl solutions by in-situ external reflection FTIR spectroelectrochemical technique. It is found that the behavior of the electroactive PdHCF film can be understood in terms of two states: Pd2Fe(II)(CN)6 formed in the inner layer and (M+)2Fe(II)(CN)6 (M+: electrolyte cation) formed in the outer layer. The inner layer is oxidized at Em=0.87 V in 1 mol/L KCl, while for the outer layer Em=0.77 V(vs. Ag/AgCl). In 1 mol/L NaCl or HCl solutions, …

Go to article

Influence Of Ptfe And Nafion On The Utilization Efficiency Of Pt/C Catalyst In Pemfc, Xiao-Liang Cheng, Bao-Lian Yi, Jing-Xin Zhang, Ming Han, Ya-Guang Qiao May 1999

Influence Of Ptfe And Nafion On The Utilization Efficiency Of Pt/C Catalyst In Pemfc, Xiao-Liang Cheng, Bao-Lian Yi, Jing-Xin Zhang, Ming Han, Ya-Guang Qiao

Journal of Electrochemistry

With cycling voltammetry curve(C-V), TEM and SEM photographs, the influence of PTFE and Nafion on the platinum utilization in catalyst layer of PEMFC was investigated. The results show that in gas diffusion electrode, the blocking effect of PTFE in the platinum utilization is not pronunced. In the thin-film catalyst layer, the electron conduct of the catalyst was blocked by the nafion solid and this caused the decrease of platinum utilization. With the increase of the nafion content in the catalyst layer, both platinum utilization and the electron conductivity decreased in the catalyst layer. Because the molecule size of nafion is …

Go to article

Effect Of Inhibitor On Electrochemical Behavior Of 1cr18 Stainless Steel In Acidic Solution Under Friction, Jin-Ping Xiong May 1999

Effect Of Inhibitor On Electrochemical Behavior Of 1cr18 Stainless Steel In Acidic Solution Under Friction, Jin-Ping Xiong

Journal of Electrochemistry

The electrochemical behavior of 1Cr18 stainless steel had been studied using a reciprocating triboelectrochemical equipment under friction in 0.2 mol/L H2SO4 solution with and without addition of thiourea, the frictionized surface of 1Cr18 stainless steel had been examined by the SEM, XPS and IR. The results showed that the loss rate of 1Cr18 stainless steel in the solution could be reduced by addition of thiourea. The adsorption of thiourea on the surface of 1Cr18 stainless steel prohibited the oxidization of Cr3+ to form Cr(Ⅵ) and formation of passive film consisting of CrO42- or/and Cr(Ⅵ), …

Go to article

Preface (1999), Association Of Christians In The Mathematical Sciences May 1999

Preface (1999), Association Of Christians In The Mathematical Sciences

ACMS Conference Proceedings 1999

Twelfth ACMS Conference on Mathematics from a Christian Perspective

Go to article

Introduction (1999), Association Of Christians In The Mathematical Sciences May 1999

Introduction (1999), Association Of Christians In The Mathematical Sciences

ACMS Conference Proceedings 1999

Twelfth ACMS Conference on Mathematics from a Christian Perspective

Go to article

Self-Association Of Rifamycin B: Possible Effects On Molecular Recognition, Daniel W. Armstrong, Jeffrey Schneiderheinze, Usha Nair, Linda J. Magid, Paul D. Butler May 1999

Self-Association Of Rifamycin B: Possible Effects On Molecular Recognition, Daniel W. Armstrong, Jeffrey Schneiderheinze, Usha Nair, Linda J. Magid, Paul D. Butler

Chemistry Faculty Research & Creative Works

The macrocyclic antibiotic rifamycin B was found to be highly surface-active and to aggregate in aqueous solution. The aggregational behavior was studied using small-angle neutron scattering (SANS). Aqueous solutions of rifamycin B showed pronounced scattering at both small-length scales (Q ≥ 0.1 Å-1) and at large-length scales (Q ≤ 0.1 Å-1). The larger association colloids appear to be rather open low-density aggregates. The addition of 10% 2-propanol greatly reduces the number and size of the aggregates. Somewhat higher amounts of alcohol appear to completely suppress or eliminate aggregation. The suppression of aggregation coincides with the appearance and enhancement of enantioselective …

Go to article

Schedule (1999), Association Of Christians In The Mathematical Sciences May 1999

Schedule (1999), Association Of Christians In The Mathematical Sciences

ACMS Conference Proceedings 1999

Twelfth ACMS Conference on Mathematics from a Christian Perspective

Go to article

Table Of Contents (1999), Association Of Christians In The Mathematical Sciences May 1999

Table Of Contents (1999), Association Of Christians In The Mathematical Sciences

ACMS Conference Proceedings 1999

Twelfth ACMS Conference on Mathematics from a Christian Perspective

Go to article

Metallicity Calibration Of A Ddo Cn Index And Other Low-Resolution Indices For G And K Stars, B. J. Taylor May 1999

Metallicity Calibration Of A Ddo Cn Index And Other Low-Resolution Indices For G And K Stars, B. J. Taylor

Faculty Publications

Metallicity calibrations of low-resolution parameters are potentially useful for (at least) two problems: the properties of moving groups, and the supermetallicity problem in K giants. In this paper, metallicity calibrations are derived for six sets of parameters. One of these parameters is the DDO CN index deltaCN. This parameter and three others are calibrated for use with evolved G and K stars. Two additional sets of low-resolution parameters are calibrated for use with G and K dwarfs. The calibrations are derived by comparing the input data with two catalogs of homogenized high-dispersion results from diverse authors (see Taylor 1995, 1999a). …

Go to article

"Quadrupolar" Molecular Nonlinear Optics, V. Ostroverkhov, O. Ostroverkhova, Kenneth D. Singer, L. Sukhomlinova, R. J. Twieg May 1999

"Quadrupolar" Molecular Nonlinear Optics, V. Ostroverkhov, O. Ostroverkhova, Kenneth D. Singer, L. Sukhomlinova, R. J. Twieg

Faculty Scholarship

Quadrupolar and octupolar invariants may be used as methods to attain noncentrosymmetric materials for application in second order nonlinear optics. The structure-property relationships for the J = 2, or quadrupole rotational invariant, are investigated. Proper citation for the Technical Digest CD-ROM should be written in the following format: Ostrovekhov V., Ostroverkhova O., Petschek R.G., Singer K.D., Sukhomlinova L., Twieg R.J., “`Quadrupolar' molecular nonlinear optics,” in the Conference on Lasers and Electro-Optics (CLEO)/The International Quantum Electronics Conference (IQEC) (Optical Society of America, Washington, DC, 2009), Proceedings, 8-9

Go to article

Optically Pumped Electron Spin Filter, Herman Batelaan, A. S. Green, B. A. Hitt, Timothy J. Gay May 1999

Optically Pumped Electron Spin Filter, Herman Batelaan, A. S. Green, B. A. Hitt, Timothy J. Gay

Timothy J. Gay Publications

This paper reports the first experimental demonstration of an optically pumped electron spin filter. Unpolarized electrons produced in a cold-cathode discharge drift through a mixture of spin-polarized Rb and a nitrogen or helium buffer gas. Through spin-exchange collisions with the Rb, the drifting electrons become polarized along the optical pumping axis. We study the role of the buffer gas in both the optical pumping and the spin transfer to the free electrons. This spin filter produces electron beams with currents and polarizations comparable to first-generation GaAs polarized electron sources.

Go to article

Particle Sizing In Strongly Turbid Suspensions With The One-Beam Cross-Correlation Dynamic Light-Scattering Technique, Anthony J. Adorjan, James A. Lock, Thomas W. Taylor, Padetha Tin, William V. Meyer, Anthony E. Smart May 1999

Particle Sizing In Strongly Turbid Suspensions With The One-Beam Cross-Correlation Dynamic Light-Scattering Technique, Anthony J. Adorjan, James A. Lock, Thomas W. Taylor, Padetha Tin, William V. Meyer, Anthony E. Smart

Physics Faculty Publications

The utility of the one-beam cross-correlation dynamic light-scattering system for sizing small particles in suspension was previously limited by its small-intensity signal-to-baseline ratio for strongly turbid suspensions. We describe three improvements in the optical system and sample cell that raise the ratio to a value comparable with that of other cross-correlation dynamic light-scattering systems. These improvements are (i) using a square cross-sectional sample cell to minimize the attenuation of the incident beam and singly scattered light, (ii) placing a 200-mu m-wide slit between the sample cell and the detector fibers to mask off the region of weak single scattering and …

Go to article

Mobile-Agent Planning In A Market-Oriented Environment, Jonathan Bredin, David Kotz, Daniela Rus May 1999

Mobile-Agent Planning In A Market-Oriented Environment, Jonathan Bredin, David Kotz, Daniela Rus

Computer Science Technical Reports

We propose a method for increasing incentives for sites to host arbitrary mobile agents in which mobile agents purchase their computing needs from host sites. We present a scalable market-based CPU allocation policy and an on-line algorithm that plans a mobile agent's expenditure over a multihop ordered itinerary. The algorithm chooses a set of sites at which to execute and computational priorities at each site to minimize execution time while preserving a prespecified budget constraint. We present simulation results of our algorithm to show that our allocation policy and planning algorithm scale well as more agents are added to the …

Go to article

Instant Preheating, Gary Felder, Lev Kofman, Andrei Linde May 1999

Instant Preheating, Gary Felder, Lev Kofman, Andrei Linde

Physics: Faculty Publications

We describe a new efficient mechanism of reheating. Immediately after rolling down the rapidly moving inflaton field φ produces particles χ, which may be either bosons or fermions. This is a nonperturbative process which occurs almost instantly; no oscillations or parametric resonance is required. The effective masses of the χ particles may be very small at the moment when they are produced, but they “fatten” when the field φ increases. When the particles χ become sufficiently heavy, they rapidly decay to other, lighter particles. This leads to an almost instantaneous reheating accompanied by the production of particles with masses which …

Go to article

Surfaces Of The Perovskite Manganites La1-XCaXMno3, Jaewu Choi, Jiandi Zhang, Sy-Hwang Liou, Peter A. Dowben, E. Ward Plummer May 1999

Surfaces Of The Perovskite Manganites La1-XCaXMno3, Jaewu Choi, Jiandi Zhang, Sy-Hwang Liou, Peter A. Dowben, E. Ward Plummer

Department of Physics and Astronomy: Faculty Publications

Angle-resolved core-level photoemission has been utilized to study the surfaces of crystalline thin films of manganite La1-xCaxMnO3 (x=0.1 and 0.35). It is found that both the surface termination and Ca surface concentration depend on the bulk Ca concentration. For La0.65Ca0.35MnO3, the terminal layer is predominately Mn-O, while for La0.9Ca0.1MnO3, the majority of the surface is La/Ca-O terminated. Both surfaces exhibit a large enhancement in the Ca concentration compared to the bulk with the La0.9Ca0.1MnO3 sample, having a larger …

Go to article

Modeling The High-Speed Switching Of Far-Infrared Radiation By Photoionization In A Semiconductor, Thomas E. Wilson May 1999

Modeling The High-Speed Switching Of Far-Infrared Radiation By Photoionization In A Semiconductor, Thomas E. Wilson

Physics Faculty Research

Data from an earlier study [T. Vogel et al., Appl. Opt. 31, 329 (1992)] on the subnanosecond switching of 119-μm radiation in high-resistivity silicon by pulsed UV laser radiation, is compared with a refined one-dimensional numerical multilayer model accounting for the generation, recombination, and diffusion of the free carriers on the resulting far-infrared optical properties of the silicon. The inclusion of recent measurements for carrier-density and temperature-dependent transport parameters leads to improved agreement between experiment and theory.

Go to article

The Peculiar Motions Of Early-Type Galaxies In Two Distant Rregions — Ii. The Spectroscopic Data, Gary Wegner, Matthew Colless, R. P. Saglia, Robert K. Mcmahan May 1999

The Peculiar Motions Of Early-Type Galaxies In Two Distant Rregions — Ii. The Spectroscopic Data, Gary Wegner, Matthew Colless, R. P. Saglia, Robert K. Mcmahan

Dartmouth Scholarship

We present the spectroscopic data for the galaxies studied in the EFAR project, which is designed to measure the properties and peculiar motions of early-type galaxies in two distant regions. We have obtained 1319 spectra of 714 early-type galaxies over 33 observing runs on 10 different telescopes. We describe the observations and data reductions used to measure redshifts, velocity dispersions and the Mgb and Mg2 Lick linestrength indices. Detailed simulations and intercomparison of the large number of repeat observations lead to reliable error estimates for all quantities. The measurements from different observing runs are calibrated to a common …

Go to article

Solutions To A Nonlinear Drift-Diffusion Model Of Semiconductors, Weifu Fang, Kazufumi Ito May 1999

Solutions To A Nonlinear Drift-Diffusion Model Of Semiconductors, Weifu Fang, Kazufumi Ito

Mathematics and Statistics Faculty Publications

A nonlinear drift-diffusion model for semiconductors is analyzed to show the existence of non-vacuum global solutions and stationary solutions. The long time behavior of the solutions is studied by establishing the existence of an absorbing set and a compact attractor of the dynamical system. Parallel results on vacuum solutions are also obtained under weaker conditions on model parameters.

Go to article

First Prev Next Last