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Key computational kernels must run near their peak efficiency for most high‐performance computing (HPC) applications. Getting this level of efficiency has always required extensive tuning of the kernel on a particular platform of interest. The success or failure of an optimization is usually measured by invoking a timer. Understanding how to build reliable and context‐sensitive timers is one of the most neglected areas in HPC, and this results in a host of HPC software that looks good when reported in the papers, but delivers only a fraction of the reported performance when used by actual HPC applications. In this paper, we motivate the importance of timer design and then discuss the techniques and methodologies we have developed in order to accurately time HPC kernel routines for our well‐known empirical tuning framework, ATLAS. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
3.
Erin Vanessa LaRae Smith Rebecca Maree Dyson Christina M. G. Vanderboor Ousseynou Sarr Jane Anderson Mary J. Berry Timothy R. H. Regnault Lifeng Peng Clint Gray 《International journal of molecular sciences》2022,23(2)
Excess dietary fructose is a major public health concern, yet little is known about its influence on offspring development and later-life disease when consumed in excess during pregnancy. To determine whether increased maternal fructose intake could have long-term consequences on offspring health, we investigated the effects of 10% w/v fructose water intake during preconception and pregnancy in guinea pigs. Female Dunkin Hartley guinea pigs were fed a control diet (CD) or fructose diet (FD; providing 16% of total daily caloric intake) ad libitum 60 days prior to mating and throughout gestation. Dietary interventions ceased at day of delivery. Offspring were culled at day 21 (D21) (weaning) and at 4 months (4 M) (young adult). Fetal exposure to excess maternal fructose intake significantly increased male and female triglycerides at D21 and 4 M and circulating palmitoleic acid and total omega-7 through day 0 (D0) to 4 M. Proteomic and functional analysis of significantly differentially expressed proteins revealed that FD offspring (D21 and 4 M) had significantly increased mitochondrial metabolic activities of β-oxidation, electron transport chain (ETC) and oxidative phosphorylation and reactive oxygen species production compared to the CD offspring. Western blotting analysis of both FD offspring validated the increased protein abundances of mitochondrial ETC complex II and IV, SREBP-1c and FAS, whereas VDAC1 expression was higher at D21 but lower at 4 M. We provide evidence demonstrating offspring programmed hepatic mitochondrial metabolism and de novo lipogenesis following excess maternal fructose exposure. These underlying asymptomatic programmed pathways may lead to a predisposition to metabolic dysfunction later in life. 相似文献
4.
Hyun-Chong Cho Kenneth Clint Slatton Carolyn R. Krekeler 《International journal of remote sensing》2013,34(24):9571-9597
To map the Earth's surface at remarkable resolution, Airborne Laser Swath Mapping (ALSM) instrument technology and subsequent algorithms have been used over the last several years. Since forested watersheds have commonly been problematic to study with remote sensing techniques, the ability of ALSM technology to densely sample ground elevations beneath forest canopies is especially considerable. Stream network detection from digital elevation models (DEMs) is a key role in modelling spatially distributed hydrological processes. To detect stream channels, we have developed two approaches. The first approach is based on an encoding of mathematical morphological operators. In the second approach, a composition of geodesic top-hat and bot-hat operations of different sizes is used in order to build a morphological profile (P M) that records the image structural information. The two proposed methods perform well in terms of detection results and classification accuracies. The second approach is more general than the first, but it also requires training and more computation. 相似文献
5.
Ethan J. Kubatko Shintaro Bunya Clint Dawson Joannes J. Westerink Chris Mirabito 《Journal of scientific computing》2009,40(1-3):315-339
We present a comparative study of two finite element shallow water equation (SWE) models: a generalized wave continuity equation based continuous Galerkin (CG) model—an approach used by several existing SWE models—and a recently developed discontinuous Galerkin (DG) model. While DG methods are known to possess a number of favorable properties, such as local mass conservation, one commonly cited disadvantage is the larger number of degrees of freedom associated with the methods, which naturally translates into a greater computational cost compared to CG methods. However, in a series of numerical tests, we demonstrate that the DG SWE model is generally more efficient than the CG model (i) in terms of achieving a specified error level for a given computational cost and (ii) on large-scale parallel machines because of the inherently local structure of the method. Both models are verified on a series of analytic test cases and validated on a field-scale application. 相似文献
6.
Three-dimensional holograms were recorded in a cerium-doped, strontium barium niobate (SBN:75) photorefractive crystal. These holograms are shown to not degrade after more than one week of continuous readout and to reconstruct reproductions of the original object with an observable field of view of approximately 35 degrees. 相似文献
7.
We describe the application of a local discontinuous Galerkin method to the numerical solution of the three-dimensional shallow water equations. The shallow water equations are used to model surface water flows where the hydrostatic pressure assumption is valid. The authors recently developed a DG\linebreak method for the depth-integrated shallow water equations. The method described here is an extension of these ideas to non-depth-integrated models. The method and its implementation are discussed, followed by numerical examples on several test problems.This revised version was published online in July 2005 with corrected volume and issue numbers. 相似文献
8.
Keith Ballinger 《程序员》2002,(1):59-60
本文对当前有关RPC同SOAP之间的交互性作了一个概述和实践性的介绍。讨论了交互性问題的三个根源:Http,XML和SOAP的不连续性。 相似文献
9.
A useful property of web–based information systems [1] is the ability to display partial information. For example, a web program can display a sequence of fuzzy images which is extended by the production of improved images as execution of the program proceeds. A sequence of improving approximations to an image can be modelled by the elements of a complete partial order (CPO). CPOs can also be used to model grid-based computations. For example, consider a collection of iterative processes, each with identical functionality, which individually generate a series of improving approximations towards a desired goal. Sharing approximations from time to time among the processes may produce faster convergence than could be achieved by any of the processes separately. Each process in the collection has the potential to exchange partial information with its companions so that all may make use of the best information available.In this paper a non-blocking communication abstraction, based on CPOs, is used to develop a model of iterative web- and grid-based computations. The abstraction is novel in that it may not directly match a send communication in one process with a corresponding receive communication in another; rather, a receive communication is identified with taking the least upper bound of the set of messages available at an input port - this set may be empty, contain exactly one messsage or contain multiple messages. In all cases the receiver does not wait but gathers the best available information and proceeds with its computation. Thus, the abstraction corresponds to a loosely coupled model of distributed computation. The applicability of the model is illustrated by a number of disparate examples of distributed iterative computation. 相似文献
10.
A scheme is proposed for indirect natural illumination of deep office spaces based upon a tracking mirror mechanism. Computer simulation indicates that it can provide acceptable workplane illuminances in 10 m deep spaces for 8 hr per day under clear-sky conditions. The circumstances under which this scheme would be cost-effective are examined. 相似文献