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排序方式: 共有93条查询结果,搜索用时 15 毫秒
31.
Brecht Verstichel Helen van Aggelen Dimitri Van Neck Patrick Bultinck Stijn De Baerdemacker 《Computer Physics Communications》2011,182(6):1235-1244
The quantum many-body problem can be rephrased as a variational determination of the two-body reduced density matrix, subject to a set of N-representability constraints. The mathematical problem has the form of a semidefinite program. We adapt a standard primal–dual interior point algorithm in order to exploit the specific structure of the physical problem. In particular the matrix-vector product can be calculated very efficiently. We have applied the proposed algorithm to a pairing-type Hamiltonian and studied the computational aspects of the method. The standard N-representability conditions perform very well for this problem. 相似文献
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C Zwicker M Hering J Brecht M Bj?rnsg?rd HJ Kuhne-Velte A Kern 《Canadian Metallurgical Quarterly》1998,38(9):774-778
OBJECTIVE: To determine the clinical implications of atypical glandular cells of uncertain significance (AGCUS) in cervical cytologic smears. STUDY DESIGN: Retrospective analysis. RESULTS: Eighty-eight of 32,181 (0.27%) cervical smears obtained during the study period contained AGCUS. Of the 47 women with AGCUS, 16 had intraepithelial or invasive neoplasms (34%; 95% confidence interval, 21-49%), including 9 low or high grade squamous intraepithelial lesions, 1 adenocarcinoma in situ of the cervix, 3 adenocarcinomas of the cervix, 2 adenocarcinomas of the endometrium and 1 adenoid basal cell carcinoma of the cervix. CONCLUSION: The high prevalence of cervical and endometrial neoplasia among women with the isolated finding of AGCUS on cervical cytologic smears warrants a thorough diagnostic evaluation. 相似文献
34.
Monitoring milk fat fractionation: Effect of agitation, temperature, and residence time on physical properties 总被引:1,自引:0,他引:1
Bert Vanhoutte Koen Dewettinck Brecht Vanlerberghe André Huyghebaert 《Journal of the American Oil Chemists' Society》2002,79(12):1169-1176
With the use of two central composite designs, the effects of agitation rate, fractionation temperature, and residence time
on the thermal properties of the stearin and olein milk fat fractions were investigated. The main function of agitation during
fat fractionation was suspending the crystal aggregates and enhancing the heat transfer. For the experimental conditions described
here, crystal aggregation did not seem to be affected by agitation. The effect of fractionation temperature on the physical
properties of the olein fraction was very significant. Triangle diagrams were shown to be a useful tool for monitoring and
designing fractionation processes. They illustrate that oleins with similar melting properties can be produced over a range
of yields of stearin, which is important from an industrial point of view. Crystallizer residence time, which influences production
costs, clearly affects both stearin yield and olein melting properties. For any fractionation temperature, stearin fractions
with virtually identical melting properties and yields can be obtained over a range of olein melting properties. Manipulation
of both the fractionation temperature and residence time allows the fractionation process to be adapted to meet changing market
demands for fractions with different melting properties. 相似文献
35.
ABSTRACT Improved methods for the preparation of imidotetraalkyl-pyrophosphates are reported. The dissociation constant of the water soluble tetraethyl analogue was determined by potentiometric titration. The values for the partition constant and aggregation constant of the tetradodecyl analogue were determined by two phase EMF potentiometric titration of which the data were processed through a sophisticated general optimization technique.The application of this method also made it possible to obtain a species distribution curve of the organic phase in terms of variation of pH in the aqueous phase. 相似文献
36.
Babylon is a collection of tools and services that provide a 100% Java‐compatible environment for developing, running and managing parallel, distributed and mobile Java applications. It incorporates features such as object migration, asynchronous method invocation, and remote class loading, while providing an easy‐to‐use interface. Additionally, Babylon enables Java applications to seamlessly create and interact with remote objects, while protecting those objects from other applications by implementing access restrictions and separate namespaces. The implementation of Babylon centers around dynamic proxies, a feature first available in Java 1.3, that allow proxy objects to be created at runtime. Dynamic proxies play a key role in achieving the goals of Babylon. The potential cluster computing benefits of the system are demonstrated with experimental results, which show that sequential Java applications can achieve significant performance benefits from using Babylon to parallelize their work across a cluster of workstations. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
37.
M. C. N. Nunes J. K. Brecht A. M. M. B. Morais S. A. Sargent 《Journal of food science》1998,63(6):1033-1036
‘Chandler’, ‘Oso Grande’ and ‘Sweet Charlie’ strawberries were stored for 8 days at 1 or 10°C, or 4 days at 20°C, either unwrapped or wrapped in PVC film to retard were conducted during the 1 water loss. Total ascorbic acid (AA) content was expressed on a dry weight basis to correct for water loss differences between treatments. Loss of AA was low and did not differ between wrapped treatments at 1 and 10°C, but was much greater at 20°C. Wrapping reduced AA loss by 5-fold at 1 and 10°C and by 2-fold at 20°C. The effect was not due to modification of O2 and CO2 levels in wrapped treatments, which was minimal. The results indicate that water loss had a greater effect on AA levels than temperature. Combining wrapping with storage at 1 or 10°C reduced AA loss by 7.5-fold compared to unwrapped strawberries stored at 20°C. 相似文献
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The reflection grating coupler for direct affinity sensing is characterized in detail. The performance of this device and its potential in affinity sensing application are investigated with two affinity-based systems: A self-assembling protein-multilayer system based on avidin-biotin interaction was used to compare the response of the device with theoretical expectations. The analytical performance was characterized by a pesticide immunoassay carried out in an indirect test format with a covalently immobilized triazine derivative. Experimentally determined parameters were in good agreement with model calculations. During the binding of 12 protein monolayers at the surface, the change in effective refractive index Dn(eff) detected for a single layer decreased from approximately 8 x 10(-4) to less than 4 x10(-5) by more than 95%, indicating a filling of the evanescent field. By comparison with bulk refractive-index measurements, a refractive index n(D) approximately 1.38 of the protein multilayer was estimated. Fitting of the model gave a refractive index n(D) = 1.377 of the protein multilayer and an average thickness of 11 nm for a single protein layer. An average noise of Dn(eff) = 8.5 x 10(-7) was detected, corresponding to approximately 1% of the maximum response for a protein monolayer. At a triazine derivative attached to the surface through dextran-based surface chemistry, a maximum antibody loading that corresponds to an Dn(eff) of 1.5 x 10(-3) was observed. In an indirect immunoassay of the herbicide simazine, a detection limit of 0.25 mug/1 of simazine was reached with polyclonal Fab fragments in a concentration of 1 mug/ml. 相似文献