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61.
Mc Glone James S. Hibbard Lyndon S. Hawkins Richard A. Kasturi Rangachar 《IEEE transactions on bio-medical engineering》1987,(9):704-712
A computerized stereotactic measurement system for evaluating rat brain metabolism was developed to utilize the large amount of data generated by quantitative autoradiography. Conventional methods of measurement only analyze a small percent of these data because these methods are limited by instrument design and the subjectiveness of the investigator. However, a computerized system allows digital images to be analyzed by placing data at their appropriate three-dimensional stereotactic coordinates. The system automatically registers experimental data to a standard three-dimensional image using alignment, scaling, and matching operations. Metabolic activity in different neuronal structures is then measured by generating digital masks and superimposing them on to experimental data. 相似文献
62.
63.
64.
An overview of geographic information systems (GISs) is given, covering data collection, applications, organization, and data models. Recent trends in map data processing are examined, namely, automatic name placement, map generalization, an automatic digitizer and expert system for land-use analysis, a map oriented system for urban planning, and a knowledge-based GIS. Techniques for extracting information from paper-based images are discussed, and some experimental results are given 相似文献
65.
The present paper reports the fabrication and detailed electrical characterization of p-ZnTe/n-CdTe heterojunction diodes prepared by vacuum deposition method. The possible conduction mechanisms of the heterojunction diode were determined by analyzing the I-V characteristics. The C-V characteristics of the heterojunction diodes were studied to determine the barrier height, carrier concentration and thickness of the depletion region in the heterojunction. A theoretical band diagram of the heterojunction was drawn based on Anderson’s model. 相似文献
66.
Implant materials for orthopedic and heart surgical services demand a better corrosion resistance material than the presently
used titanium alloys, where protective oxide layer breaks down on a prolonged stay in aqueous physiological human body, giving
rise to localized corrosion of pitting, crevice, and fretting corrosion. A few surface treatments on Ti alloy, in the form
of anodization, passivation, and thermal oxidation, followed by soaking in Hank solution have been found to be very effective
in bringing down the corrosion rate as well as producing high corrosion resistance surface film as reflected from electrochemical
polarization, cyclic polarization, and Electrochemical Impedance Spectroscopy (EIS) studies. The XRD study revealed the presence
of various types of oxides along with anatase and rutile on the surface, giving rise to high corrosion resistance film. While
surface treatment of passivation and thermal oxidation could reduce the corrosion rate by 1/5th, anodization in 0.3 M phosphoric
acid at 16 V versus stainless steel cathode drastically brought down the corrosion rate by less than ten times. The mechanism
of corrosion behavior and formation of different surface films is better understood from the determination of EIS parameters
derived from the best-fit equivalent circuit. 相似文献
67.
The notion of ε-kernel was introduced by Agarwal et al. (J. ACM 51:606–635, 2004) to set up a unified framework for computing various extent measures of a point set P approximately. Roughly speaking, a subset Q⊆P is an ε-kernel of P if for every slab W containing Q, the expanded slab (1+ε)W contains P. They illustrated the significance of ε-kernel by showing that it yields approximation algorithms for a wide range of geometric optimization problems.
We present a simpler and more practical algorithm for computing the ε-kernel of a set P of points in ℝ
d
. We demonstrate the practicality of our algorithm by showing its empirical performance on various inputs. We then describe
an incremental algorithm for fitting various shapes and use the ideas of our algorithm for computing ε-kernels to analyze the performance of this algorithm. We illustrate the versatility and practicality of this technique by
implementing approximation algorithms for minimum enclosing cylinder, minimum-volume bounding box, and minimum-width annulus.
Finally, we show that ε-kernels can be effectively used to expedite the algorithms for maintaining extents of moving points.
A preliminary version of the paper appeared in Proceedings of the 20th Annual ACM Symposium on Computational Geometry, 2004, pp. 263–272. Research by the first two authors is supported by NSF under grants CCR-00-86013, EIA-98-70724, EIA-01-31905,
and CCR-02-04118, and by a grant from the US–Israel Binational Science Foundation. Research by the fourth author is supported
by NSF CAREER award CCR-0237431. 相似文献
68.
Matt Gibson Gaurav Kanade Erik Krohn Imran A. Pirwani Kasturi Varadarajan 《Algorithmica》2010,57(3):484-498
Given an n-point metric (P,d) and an integer k>0, we consider the problem of covering P by k balls so as to minimize the sum of the radii of the balls. We present a randomized algorithm that runs in n
O(log n⋅log Δ) time and returns with high probability the optimal solution. Here, Δ is the ratio between the maximum and minimum interpoint
distances in the metric space. We also show that the problem is NP-hard, even in metrics induced by weighted planar graphs
and in metrics of constant doubling dimension. 相似文献
69.
Arthur Philip Cracknell Kasturi Devi Kanniah Kian Pang Tan Lei Wang 《International journal of remote sensing》2013,34(1):262-289
Conducting quantitative studies on the carbon balance or productivity of oil palm is important for understanding the role of this ecosystem in global climate change. The MOD17 algorithm is used for processing data from the Moderate Resolution Imaging Spectroradiometer (MODIS) to generate the values of gross primary productivity (GPP) and net primary productivity for input to global carbon cycle modelling. In view of the increasing importance of data on carbon sequestration at regional and national levels, we have studied one important factor affecting the accuracy of the implementation of MOD17 at the sub-global level, namely the database of MODIS land cover (MOD12Q1) used by MOD17. By using a study area of approximately 7 km × 7 km (49 MODIS pixels) in semi-rural Johor in Peninsular Malaysia and using Google Earth 0.75 m resolution images as ground data, we found that the land-cover type for only 16 of these 49 MODIS pixels was correctly identified by MOD12Q1 using its 1 km resolution land-cover database. This leads to errors of 24% to 50% in the maximum light use efficiency, leading to corresponding errors of 24% to 50% in the GPP. We show that by using the Finer Resolution Observation and Monitoring – Global Land Cover (FROM-GLC) land-cover database developed by Gong et al., this particular error can be essentially eliminated, but at the cost of using extra computing resources. 相似文献
70.
David Crandall Sameer Antani Rangachar Kasturi 《International Journal on Document Analysis and Recognition》2003,5(2-3):138-157
Abstract. The popularity of digital video is increasing rapidly. To help users navigate libraries of video, algorithms that automatically
index video based on content are needed. One approach is to extract text appearing in video, which often reflects a scene's
semantic content. This is a difficult problem due to the unconstrained nature of general-purpose video. Text can have arbitrary
color, size, and orientation. Backgrounds may be complex and changing. Most work so far has made restrictive assumptions about
the nature of text occurring in video. Such work is therefore not directly applicable to unconstrained, general-purpose video.
In addition, most work so far has focused only on detecting the spatial extent of text in individual video frames. However,
text occurring in video usually persists for several seconds. This constitutes a text event that should be entered only once
in the video index. Therefore it is also necessary to determine the temporal extent of text events. This is a non-trivial
problem because text may move, rotate, grow, shrink, or otherwise change over time. Such text effects are common in television
programs and commercials but so far have received little attention in the literature. This paper discusses detecting, binarizing,
and tracking caption text in general-purpose MPEG-1 video. Solutions are proposed for each of these problems and compared
with existing work found in the literature.
Received: January 29, 2002 / Accepted: September 13, 2002
D. Crandall is now with Eastman Kodak Company, 1700 Dewey Avenue, Rochester, NY 14650-1816, USA; e-mail: david.crandall@kodak.com
S. Antani is now with the National Library of Medicine, 8600 Rockville Pike, Bethesda, MD 20894, USA; e-mail: antani@nlm.nih.gov
Correspondence to: David Crandall 相似文献