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991.
Jorge González-Domínguez Osni A. Marques María J. Martín Juan Touriño 《The Journal of supercomputing》2014,70(2):816-829
This paper examines four different strategies, each one with its own data distribution, for implementing the parallel conjugate gradient (CG) method and how they impact communication and overall performance. Firstly, typical 1D and 2D distributions of the matrix involved in CG computations are considered. Then, a new 2D version of the CG method with asymmetric workload, based on leaving some threads idle during part of the computation to reduce communication, is proposed. The four strategies are independent of sparse storage schemes and are implemented using Unified Parallel C (UPC), a Partitioned Global Address Space (PGAS) language. The strategies are evaluated on two different platforms through a set of matrices that exhibit distinct sparse patterns, demonstrating that our asymmetric proposal outperforms the others except for one matrix on one platform. 相似文献
992.
993.
Enterotoxigenic <Emphasis Type="Italic">Escherichia coli</Emphasis> strains bind bovine milk gangliosides in a ceramide-dependent process 总被引:2,自引:0,他引:2
Diarrhea caused by enterotoxigenic Escherichia coli (ETEC) is the main infectious disease of newborn calves. The first step of infection involves bacterial attachment to the
intestinal mucosa. This adhesion is mediated by fimbriae that recognize some glycoconjugates on the host cell surface, in
particular, several gangliosides. Because milk also contains gangliosides, these have been suggested to serve as ligands for
bacterial fimbriae and thus prevent the bacterial attachment to mucosa. The most relevant ETEC strains in calves, including
those with K99 and F41 fimbriae, were assayed to determine whether they are able to bind gangliosides isolated from several
stages of bovine lactation. Both GM3 and GD3, the main gangliosides of milk, were recognized by ETEC strains, although the
different fimbriae showed diverse levels of affinity. Unexpectedly, the adhesion to colostral gangliosides was considerably
weaker than that to gangliosides from the other stages of lactation. Because the carbohydrate moiety did not change and because
differences in the percentages of unsaturated FA and sphingosine between colostrum and other stages were observed, we conclude
that the differences in adhesion could be due to a different composition of the ganglioside caramide. 相似文献
994.
The high computation requirements of global optimization algorithms, when used to solve real optimization problems, have caused the appearance of different parallelization strategies using several parallel computing architectures. In this work, the Universal Evolutionary Global Optimizer is implemented in CUDA to be run on GPU architectures (GPuEGO). This parallelization of the referred evolutionary multimodal optimization algorithm is rather different from other previous parallel implementations designed to be executed into shared or distributed memory processors. In this case, due to the special characteristics of a GPU architecture, the original data structures are not valid and it has been necessary to redefine them and all the functions that operate with them. When this approach is applied the acceleration factors achieved by GPuEGO range from \({\times }\) 6.33 to \({\times }\) 23.20 depending on the test function. 相似文献
995.
介绍了中国石化成品油二次物流配送优化系统的开发、建设过程以及实施效果,提出了进一步提升该系统的建议. 相似文献
996.
997.
The present work analyzes the effect of various factors on the hydration of pentasodium triphosphate. The experimental method
is based on application of the hydration test. Technical-quality products with different proportions of phase I and phase
II have been used. The variables studied are phase I/phase II ratio, initial temperature, particle size, stirring rate and
composition of the slurry (presence of hexahydrate crystals and water hardness). The results have been discussed according
to a kinetics model that includes a series of stages of a physical nature (dissolution of anhydrous salt and the crystallization
of the hexahydrate), as well as of a chemical nature (solvation of the ions in solution). Crystallization of the hexahydrate
may be the controlling stage in the process. 相似文献
998.
改性硝酸铵的工业制备方法及其性能 总被引:2,自引:0,他引:2
硝酸铵饱和溶液中加入表面活性剂辛基三甲基溴化铵,采用真空膨胀结晶技术工业制备一种新型改性硝酸铵,并介绍其性能特点。 相似文献
999.
涤纶切片的结晶性能及其对POY结构均匀性的影响 总被引:4,自引:0,他引:4
采用DSC等方法研究了几种涤纶切片的等速降温结晶性能,提出了用熔融结晶峰的半高宽/峰高的比值、过冷度和结晶度来定量表征的方法,并结合纺丝过程讨论了其对POY成形时结构均匀性的影响。结晶性能差的切片,易得到结构均匀的POY。 相似文献
1000.
The garment fit played an important role in protective performance, comfort and mobility. The purpose of this study is to quantify the air gap to quantitatively characterize a three-dimensional (3-D) garment fit using a 3-D body scanning technique. A method for processing of scanned data was developed to investigate the air gap size and distribution between the clothing and human body. The mesh model formed from nude and clothed body was aligned, superimposed and sectioned using Rapidform software. The air gap size and distribution over the body surface were analyzed. The total air volume was also calculated. The effects of fabric properties and garment size on air gap distribution were explored. The results indicated that average air gap of the fit clothing was around 25–30 mm and the overall air gap distribution was similar. The air gap was unevenly distributed over the body and it was strongly associated with the body parts, fabric properties and garment size. The research will help understand the overall clothing fit and its association with protection, thermal and movement comfort, and provide guidelines for clothing engineers to improve thermal performance and reduce physiological burden. 相似文献