排序方式: 共有14条查询结果,搜索用时 15 毫秒
1.
2.
3.
Sanford TW Allshouse GO Marder BM Nash TJ Mock RC Spielman RB Seamen JF McGurn JS Jobe D Gilliland TL Vargas M Struve KW Stygar WA Douglas MR Matzen MK Hammer JH De Groot JS Eddleman JL Peterson DL Mosher D Whitney KG Thornhill JW Pulsifer PE Apruzese JP Maron Y 《Physical review letters》1996,77(25):5063-5066
4.
Chong Saehwa Riley Brian J. Nienhuis Emily T. Lee Dongjin McCloy John S. 《Journal of chemical crystallography》2021,51(3):293-300
Journal of Chemical Crystallography - Four different rare-earth oxyapatites of Ca2RE8(SiO4)6O2 (RE?=?Pr, Tb, Ho, Tm) were synthesized using a solution-based method followed by drying,... 相似文献
5.
An integral equation formulation for buoyancy-driven convection problems is developed and illustrated. Buoyancy-driven convection in a bounded cylindrical geometry with a free surface is studied for a range of aspect ratios and Nusselt numbers. The critical Rayleigh number, the nature of the cellular motion, and the heat transfer enhancement are computed using linear theory. Green's functions are used to convert the linear problem into linear Fredholm integral equations. Theorems are proved which establish the properties of the eigenvalues and eigenfunctions of the linear integral operator which appears in these equations. 相似文献
6.
Fernández P Durand JS Pérez-Conde C Paniagua G 《Analytical and bioanalytical chemistry》2003,375(8):1020-1023
This paper reports a new flow-through fluoroimmunosensor, the function of which is based on antibodies immobilized on an inmunoreactor of controlled-pore glass (CPG), for determination of digoxin, used in the treatment of congestive heart failure and artery disease. The immunosensor has a detection limit of 1.20 microg L(-1) and provides high reproducibility (RSD=4.5% for a concentration of 0.0025 mg L(-1), and RSD=6.7% for 0.01 mg L(-1)). The optimum working concentration range was found to be 1.2 x 10(-3)-4.0 x 10(-2) mg L(-1). The lifetime of the immunosensor was about 50 immunoassays; if stored unused its lifetime can be extended to three months. A sample speed of about 10-12 samples per hour can be attained. Possible interference from substances with structures similar to digoxin (morphine, heroin, tebaine, codeine, pentazocine and narcotine) was investigated. No cross-reactivity was seen at the highest digoxin: interferent ratio studied (1:100). The proposed fluoroimmunosensor was successfully used to determine digoxin concentrations in human serum samples. 相似文献
7.
Jaehun Chun John S. McCloy Jarrod V. Crum Shanmugavelayutham K. Sundaram 《Rheologica Acta》2011,50(2):125-130
A novel millimeter wave (MMW) rheometry is developed to determine the viscosity of fluids based on an unsteady film flow on
an inclined plane. The method measures fringes due to MMW interference between the front and back surfaces of a fluid flowing
across the field of view of a ceramic wave guide coupled to a MMW receiver operating at 137 GHz. With knowledge of the dielectric
constant, the interference fringe spacing is used to calculate the thickness of the fluid layer. This thickness is then transformed
into the viscosity by means of a simple hydrodynamic theory. Our results show that the MMW rheometry can practically distinguish
between the 30, 100, and 200 Pa·s silicone oils. The geometry of the method allows for potential industrial applications such
as measuring viscosity of the flowing slag down the walls of coal gasifiers. The MMW rheometry with simple modifications can
be easily extended to measure important non-Newtonian fluid characteristics such as yield stress. 相似文献
8.
9.
Paul L. Gassman John S. McCloy Chuck Z. Soderquist Michael J. Schweiger 《Journal of Raman spectroscopy : JRS》2014,45(1):139-147
Sodium borosilicate glasses containing rhenium or technetium were fabricated and their vibrational spectra studied using confocal Raman microscopy. Glass spectra were interpreted relative to new high‐resolution spectra of pure crystalline NaReO4, KReO4, NaTcO4, and KTcO4 salts. Spectra of perrhenate and pertechnetate glasses exhibited sharp Raman bands, characteristic of crystalline salt species, superimposed on spectral features of the borosilicate matrix. At low concentrations of added KReO4 or KTcO4, the characteristic pertechnetate and perrhenate features are weak, whereas at high additions, sharp peaks from crystal field‐splitting and C4h symmetry dominate glass spectra, clearly indicating ReO4− or TcO4− is locally coordinated with K and/or Na. Peaks indicative of both K and Na salts are evident in many Raman spectra, with the Na form being favored at high concentrations of the source chemicals, where more K+ is available for ion exchange with Na+ from the base glass. The observed ion exchange likely occurred within depolymerized channels where nonbridging oxygens create segregation from the glass network in regions containing anions such as ReO4− and TcO4− as well as excess alkali cations. Although this anion exchange provides evidence of chemical mixing in the glass, it does not prove the added salts were homogeneously incorporated in the glass. The susceptibility to ion exchange from the base glass indicates that long‐term immobilization of Tc in borosilicate glass must account for excess charge compensating alkali cations in melt glass formulations. Published 2014. This article is a U. S. Government work and is in the public domain in the USA. 相似文献
10.
R. Golovchak O. Shpotyuk A. Kozdras B. J. Riley S. K. Sundaram J. S. McCloy 《Journal of Thermal Analysis and Calorimetry》2011,103(1):213-218
Radiation-induced physical aging effects are studied in binary As
x
S100−x
and As
x
Se100−x
(30 ≤ x ≤ 42) glasses by conventional differential scanning calorimetry (DSC) method. It is shown that γ-irradiation (Co60 source, ~3 MGy dose) of glassy As
x
S100−x
caused a measurable increase in glass transition temperature and endothermic peak area in the vicinity of glass transition
region, which was associated with acceleration of structural relaxation processes in these materials. In contrast to sulfide
glasses, the samples of As–Se family did not exhibit any significant changes in DSC curves after γ-irradiation. The observed
difference in radiation-induced physical aging between sulfides and selenides was explained by more effective destruction-polymerization
transformations and possible metastable defects formation in S-based glassy network. 相似文献