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排序方式: 共有203条查询结果,搜索用时 15 毫秒
1.
R. Morena P. E. Lockwood L. Evans C. W. Fairhurst 《Journal of the American Ceramic Society》1986,69(4):75-C-
The effect on mechanical behavior of ZrO2 additions to a dental porcelain was investigated. The ZrO2 was introduced into the glassy matrix phase of the porcelain by refritting the all-glass porcelain constituent. X-ray diffraction indicated that a sizeable fraction of the ZrO2 was retained in the tetragonal form after the porcelain was fired. Zirconia additions to the porcelain produced substantial improvements in fracture toughness, strength, and thermal shock resistance. 相似文献
2.
This paper presents a novel matrix unit cell scheduler (MUCS) for input-buffered asynchronous transfer mode (ATM) switches. The MUCS concept originates from a heuristic strategy that leads to an optimal solution for cell scheduling. Numerical analysis indicates that input-buffered ATM switches scheduled by MUCS can utilize nearly 100% of the available link bandwidth. A transistor-level MUCS circuit has been designed and verified using HSPICE. The circuit features a regular structure, minimal interconnects, and a low transistor count. HSPICE simulation indicates that using 2-μm CMOS technology, the MUCS circuit can operate at clock frequency of 100 MHz 相似文献
3.
Dave Lockwood 《Digital Creativity》2013,24(1):3-6
The paper describes a number of virtual reality projects taking place in Africa. The availability of VR on PCs, it is argued, has made access possible for a large number of users. Applications for education and training and applications that preserve and promote African culture are particularly highlighted. 相似文献
4.
Deep packet inspection using parallel bloom filters 总被引:2,自引:0,他引:2
There is a class of packet processing applications that inspect packets deeper than the protocol headers to analyze content. For instance, network security applications must drop packets containing certain malicious Internet worms or computer viruses carried in a packet payload. Content forwarding applications look at the hypertext transport protocol headers and distribute the requests among the servers for load balancing. Packet inspection applications, when deployed at router ports, must operate at wire speeds. With networking speeds doubling every year, it is becoming increasingly difficult for software-based packet monitors to keep up with the line rates. We describe a hardware-based technique using Bloom filters, which can detect strings in streaming data without degrading network throughput. A Bloom filter is a data structure that stores a set of signatures compactly by computing multiple hash functions on each member of the set. This technique queries a database of strings to check for the membership of a particular string. The answer to this query can be false positive but never a false negative. An important property of this data structure is that the computation time involved in performing the query is independent of the number of strings in the database provided the memory used by the data structure scales linearly with the number of strings stored in it. Furthermore, the amount of storage required by the Bloom filter for each string is independent of its length. 相似文献
5.
Photoreduction of Shewanella oneidensis Extracellular Cytochromes by Organic Chromophores and Dye‐Sensitized TiO2 下载免费PDF全文
Emma V. Ainsworth Dr. Colin W. J. Lockwood Dr. Gaye F. White Dr. Ee Taek Hwang Dr. Tsubasa Sakai Manuela A. Gross Prof. David J. Richardson Dr. Thomas A. Clarke Dr. Lars J. C. Jeuken Dr. Erwin Reisner Prof. Julea N. Butt 《Chembiochem : a European journal of chemical biology》2016,17(24):2324-2333
The transfer of photoenergized electrons from extracellular photosensitizers across a bacterial cell envelope to drive intracellular chemical transformations represents an attractive way to harness nature's catalytic machinery for solar‐assisted chemical synthesis. In Shewanella oneidensis MR‐1 (MR‐1), trans‐outer‐membrane electron transfer is performed by the extracellular cytochromes MtrC and OmcA acting together with the outer‐membrane‐spanning porin ? cytochrome complex (MtrAB). Here we demonstrate photoreduction of solutions of MtrC, OmcA, and the MtrCAB complex by soluble photosensitizers: namely, eosin Y, fluorescein, proflavine, flavin, and adenine dinucleotide, as well as by riboflavin and flavin mononucleotide, two compounds secreted by MR‐1. We show photoreduction of MtrC and OmcA adsorbed on RuII‐dye‐sensitized TiO2 nanoparticles and that these protein‐coated particles perform photocatalytic reduction of solutions of MtrC, OmcA, and MtrCAB. These findings provide a framework for informed development of strategies for using the outer‐membrane‐associated cytochromes of MR‐1 for solar‐driven microbial synthesis in natural and engineered bacteria. 相似文献
6.
Brown JA Lockwood GR 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2002,49(6):848-851
The design of a low-cost pulse generator for ultrasound imaging is presented. The pulser can provide 10 kW pulses with less than 0.7 Vpp ringing. Pulses ranging from 10 to 500 ns have been successfully generated 相似文献
7.
Predictions have been obtained for the flow, combustion, and heat transfer within a refinery process heater. The flow and combustion in the highly three-dimensional geometry are handled by a numerical solution technique and physical modeling which have an estab;ished two-dimensional predictive history. The radiation transfer is handled by the more recent and very flexible “discrete transfer” technique. Special grids and computational procedures are employed in the interests of computational economy, with the burner region and the main combustion chamber region being handled in separate subcodes. The predictions of the wall heat transfer distribution are compared with measurements and the agreement is remarkably good. 相似文献
8.
Thomas J. Olson John R. Taylor Robert J. Lockwood 《Computer Vision and Image Understanding》1996,64(3):351-367
Real-time computer vision systems often make use of dedicated image processing hardware to perform the pixel-oriented operations typical of early vision. This type of hardware is notoriously difficult to program, limiting the types of experiments that can be performed and posing a serious obstacle to research progress. This paper describes a pair of programming tools that we have developed to simplify the task of building real-time early vision systems using special-purpose hardware. The system allows users to describe computations in terms of coarse-grained dataflow graphs constructed using an interactive graphical tool. At initialization time it compiles these graphs into efficient executable programs for the underlying hardware. The system has been implemented on a popular commercial pipelined image processor. We describe the computational model that the system supports, the facilities it provides for building real-vision applications, and the algorithms used to generate effective execution schedules for the target machine. 相似文献
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