Christian veterinary missions of Canada     

Barnum D  Van Dijk C 《The Canadian veterinary journal. La revue veterinaire canadienne》1994,35(6):330

  相似文献   

Conducting carbon wires in ordered, nanometer-sized channels     

Wu CG  Bein T 《Science (New York, N.Y.)》1994,266(5187):1013-1015

The encapsulation of graphite-type carbon wires in the regular, 3-nanometer-wide hexagonal channels of the mesoporous host MCM-41 is reported. Acrylonitrile monomers are introduced through vapor or solution transfer and polymerized in the channels with external radical initiators. Pyrolysis of the intrachannel polyacrylonitrile results in filaments whose microwave conductivity is about 10 times that of bulk carbonized polyacrylonitrile. The MCM host plays a key role in ordering the carbon structure, most likely through the parallel alignment of the precursor polymer chains in the channels. The fabrication of stable carbon filaments in ordered, nanometer-sized channels represents an important step toward the development of nanometer electronics.  相似文献   

Plutonium's Existence     

Richmond CR 《Science (New York, N.Y.)》1994,264(5155):14

  相似文献   

LIGO Director Out in Shakeup     

Anderson C 《Science (New York, N.Y.)》1994,263(5152):1366

  相似文献   

Pinning down a treacherous border in logical statements     

Cipra B 《Science (New York, N.Y.)》1994,264(5163):1249

  相似文献   

A theory of perception     

Baird JC 《Science (New York, N.Y.)》1994,264(5157):447

  相似文献   

Overlapping dissertation topics     

Whitbeck C 《Science (New York, N.Y.)》1994,265(5175):1020

  相似文献   

Science and math scores rebound     

Holden C 《Science (New York, N.Y.)》1994,265(5176):1167

  相似文献   

The role of mesoscale tracer transports in the global ocean circulation   总被引：1，自引：0，他引：1  

Danabasoglu G  McWilliams JC  Gent PR 《Science (New York, N.Y.)》1994,264(5162):1123-1126

Ocean models routinely used in simulations of the Earth's climate do not resolve mesoscale eddies because of the immense computational cost. A new parameterization of the effects of these eddies has been implemented in a widely used model. A comparison of its solution with that of the conventional parameterization shows significant improvements in the global temperature distribution, the poleward and surface heat fluxes, and the locations of deep-water formation.  相似文献   

Simulating the adsorption of alkanes in zeolites     

Smit B  Siepmann JI 《Science (New York, N.Y.)》1994,264(5162):1118-1120

The configurational-bias Monte Carlo technique is applied to simulate the adsorption of long chain alkanes in zeolites. This simulation technique is several orders of magnitude more efficient than conventional methods that can be used to simulate the adsorption of long chain alkanes. The calculated heats of adsorption are found to be in excellent agreement with experimental data. The results show a surprising chain length dependence of the heats of adsorption. This dependence has a simple molecular explanation in terms of preferential siting of the long chain alkanes.  相似文献