全文获取类型
收费全文 | 4385篇 |
免费 | 101篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 51篇 |
综合类 | 1篇 |
化学工业 | 540篇 |
金属工艺 | 70篇 |
机械仪表 | 66篇 |
建筑科学 | 123篇 |
矿业工程 | 4篇 |
能源动力 | 92篇 |
轻工业 | 281篇 |
水利工程 | 21篇 |
石油天然气 | 3篇 |
无线电 | 361篇 |
一般工业技术 | 608篇 |
冶金工业 | 1620篇 |
原子能技术 | 47篇 |
自动化技术 | 600篇 |
出版年
2022年 | 22篇 |
2021年 | 26篇 |
2019年 | 34篇 |
2018年 | 44篇 |
2017年 | 48篇 |
2016年 | 34篇 |
2015年 | 40篇 |
2014年 | 75篇 |
2013年 | 183篇 |
2012年 | 77篇 |
2011年 | 121篇 |
2010年 | 106篇 |
2009年 | 104篇 |
2008年 | 110篇 |
2007年 | 127篇 |
2006年 | 91篇 |
2005年 | 82篇 |
2004年 | 83篇 |
2003年 | 95篇 |
2002年 | 86篇 |
2001年 | 91篇 |
2000年 | 85篇 |
1999年 | 111篇 |
1998年 | 454篇 |
1997年 | 268篇 |
1996年 | 200篇 |
1995年 | 137篇 |
1994年 | 121篇 |
1993年 | 123篇 |
1992年 | 61篇 |
1991年 | 67篇 |
1990年 | 55篇 |
1989年 | 64篇 |
1988年 | 68篇 |
1987年 | 59篇 |
1986年 | 39篇 |
1985年 | 50篇 |
1984年 | 61篇 |
1983年 | 53篇 |
1982年 | 46篇 |
1981年 | 52篇 |
1980年 | 56篇 |
1979年 | 57篇 |
1978年 | 43篇 |
1977年 | 64篇 |
1976年 | 116篇 |
1975年 | 42篇 |
1974年 | 33篇 |
1972年 | 24篇 |
1966年 | 22篇 |
排序方式: 共有4488条查询结果,搜索用时 0 毫秒
121.
Cooperative adaptive control for synchronization of second‐order systems with unknown nonlinearities
This paper studies synchronization to a desired trajectory for multi‐agent systems with second‐order integrator dynamics and unknown nonlinearities and disturbances. The agents can have different dynamics and the treatment is for directed graphs with fixed communication topologies. The command generator or leader node dynamics is also nonlinear and unknown. Cooperative tracking adaptive controllers are designed based on each node maintaining a neural network parametric approximator and suitably tuning it to guarantee stability and performance. A Lyapunov‐based proof shows the ultimate boundedness of the tracking error. A simulation example with nodes having second‐order Lagrangian dynamics verifies the performance of the cooperative tracking adaptive controller. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
122.
Rhee T Lewis JP Neumann U Nayak KS 《IEEE transactions on visualization and computer graphics》2011,17(3):368-379
This paper describes a complete system to create anatomically accurate example-based volume deformation and animation of articulated body regions, starting from multiple in vivo volume scans of a specific individual. In order to solve the correspondence problem across volume scans, a template volume is registered to each sample. The wide range of pose variations is first approximated by volume blend deformation (VBD), providing proper initialization of the articulated subject in different poses. A novel registration method is presented to efficiently reduce the computation cost while avoiding strong local minima inherent in complex articulated body volume registration. The algorithm highly constrains the degrees of freedom and search space involved in the nonlinear optimization, using hierarchical volume structures and locally constrained deformation based on the biharmonic clamped spline. Our registration step establishes a correspondence across scans, allowing a data-driven deformation approach in the volume domain. The results provide an occlusion-free person-specific 3D human body model, asymptotically accurate inner tissue deformations, and realistic volume animation of articulated movements driven by standard joint control estimated from the actual skeleton. Our approach also addresses the practical issues arising in using scans from living subjects. The robustness of our algorithms is tested by their applications on the hand, probably the most complex articulated region in the body, and the knee, a frequent subject area for medical imaging due to injuries. 相似文献
123.
Muhammad F. Mysorewala Dan O. Popa Frank L. Lewis 《Journal of Intelligent and Robotic Systems》2009,54(4):535-565
The use of robotics in distributed monitoring applications requires wireless sensors that are deployed efficiently. A very
important aspect of sensor deployment includes positioning them for sampling at locations most likely to yield information
about the spatio-temporal field of interest, for instance, the spread of a forest fire. In this paper, we use mobile robots
(agents) that estimate the time-varying spread of wildfires using a distributed multi-scale adaptive sampling strategy. The
proposed parametric sampling algorithm, “EKF-NN-GAS” is based on neural networks, the extended Kalman filter (EKF), and greedy heuristics. It combines measurements arriving
at different times, taken at different scale lengths, such as from ground, airborne, and spaceborne observation platforms.
One of the advantages of our algorithm is the ability to incorporate robot localization uncertainty in addition to sensor
measurement and field parameter uncertainty into the same EKF model. We employ potential fields, generated naturally from
the estimated fire field distribution, in order to generate fire-safe trajectories that could be used to rescue vehicles and
personnel. The covariance of the EKF is used as a quantitative information measure for sampling locations most likely to yield
optimal information about the sampled field distribution. Neural net training is used infrequently to generate initial low
resolution estimates of the fire spread parameters. We present simulation and experimental results for reconstructing complex
spatio-temporal forest fire fields “truth models”, approximated by radial basis function (RBF) parameterizations. When compared
to a conventional raster scan approach, our algorithm shows a significant reduction in the time necessary to map the fire
field. 相似文献
124.
H-Infinity Static Output-feedback Control for Rotorcraft 总被引:1,自引:0,他引:1
Jyotirmay Gadewadikar Frank L. Lewis Kamesh Subbarao Kemao Peng Ben M. Chen 《Journal of Intelligent and Robotic Systems》2009,54(4):629-646
The problem of stabilization of an autonomous rotorcraft platform in a hover configuration subject to external disturbances
is addressed. Necessary and sufficient conditions are presented for static output-feedback control of linear time-invariant
systems using the H-Infinity approach. Simplified conditions are given which only require the solution of two coupled matrix
design equations. This paper also proposes a numerically efficient solution algorithm for the coupled design equations to
determine the output-feedback gain. A major contribution is that an initial stabilizing gain is not needed. The efficacy of
the control law and the disturbance accommodation properties are shown on a rotorcraft design example. The helicopter dynamics
do not decouple as in the fixed-wing aircraft case, so that the design of helicopter flight controllers with a desirable intuitive
structure is not straightforward. In this paper an output feedback approach is given that allows one to selectively close
prescribed multivariable feedback loops using a reduced set of the states. Shaping filters are added that improve performance
and yield guaranteed robustness and speed of response. This gives direct control over the design procedure and performance.
Accurate identification of the System parameters is a challenging task for rotorcraft control, addition of loop shaping facilitates
implementation engineers to counteract unmodeled high frequency dynamics. The net result yields control structures that have
been historically accepted in the flight control community. 相似文献
125.
Steven Hancock Mathias Disney Jan-Peter Muller Philip Lewis Mike Foster 《Remote sensing of environment》2011,115(12):3286-3297
Lidars have the unique ability to make direct, physical measurements of forest height and vertical structure in much denser canopies than is possible with passive optical or short wavelength radars. However the literature reports a consistent underestimate of tree height when using physically based methods, necessitating empirical corrections. This bias is a result of overestimating the range to the canopy top due to background noise and failing to correctly identify the ground.This paper introduces a method, referred to as “noise tracking”, to avoid biases when determining the range to the canopy top. Simulated waveforms, created with Monte-Carlo ray tracing over geometrically explicit forest models, are used to test noise tracking against simple thresholding over a range of forest and system characteristics. It was found that noise tracking almost completely removed the bias in all situations except for very high noise levels and very low (< 10%) canopy covers. In all cases noise tracking gave lower errors than simple thresholding and had a lower sensitivity to the initial noise threshold.Finite laser pulses spread out the measured signal, potentially overriding the benefit of noise tracking. In the past laser pulse length has been corrected by adding half that length to the signal start range. This investigation suggests that this is not always appropriate for simple thresholding and that the results for noise tracking were more directly related to pulse length than for simple thresholding. That this effect has not been commented on before may be due to the possible confounding impacts of instrument and survey characteristics inherent in field data. This method should help improve the accuracy of waveform lidar measurements of forests, whether using airborne or spaceborne instruments. 相似文献
126.
127.
For finite-buffer manufacturing systems, the major stability issue is "deadlock," rather than "bounded-buffer-length stability." The paper introduces the concept of "system deadlock," defined rigorously in Petri net terms, and system operation with uninterrupted part-flow is characterized in terms of the absence of this condition. For a large class of finite-buffer multiclass re-entrant flowline systems, an analysis of "circular waits" yields necessary and sufficient conditions for the occurrence of "system deadlock." This allows the formulation of a maximally permissive one-step-look-ahead deadlock-avoidance control policy for dispatching jobs, while maximizing the percent utilization of resources. The result is a generalized kanban dispatching strategy, which is more general than the standard multiclass last buffer first serve (LBFS) dispatching strategies for finite buffer flowlines that typically under-utilize the resources. The problem of computational complexity associated with Petri net (PN) applications is overcome by using certain sub-matrices of the PN incidence matrix. Computationally efficient matrix techniques are given for implementing the deadlock-free dispatching policy. 相似文献
128.
A desired compensation adaptive law‐based neural network (DCAL‐NN) controller is proposed for the robust position control of rigid‐link robots. The NN is used to approximate a highly nonlinear function. The controller can guarantee the global asymptotic stability of tracking errors and boundedness of NN weights. In addition, the NN weights here are tuned on‐line, with no offline learning phase required. When compared with standard adaptive robot controllers, we do not require linearity in the parameters, or lengthy and tedious preliminary analysis to determine a regression matrix. The controller can be regarded as a universal reusable controller because the same controller can be applied to any type of rigid robots without any modifications. A comparative simulation study with different robust and adaptive controllers is included. 相似文献
129.
Larsen L Griffin LD Grässel D Witte OW Axer H 《Microscopy research and technique》2007,70(10):851-863
Polarized light imaging (PLI) is a method to image fiber orientation in gross histological brain sections based on the birefringent properties of the myelin sheaths. The method uses the transmission of polarized light to quantitatively estimate the fiber orientation and inclination angles at every point of the imaged section. Multiple sections can be assembled into a 3D volume, from which the 3D extent of fiber tracts can be extracted. This article describes the physical principles of PLI and describes two major applications of the method: the imaging of white matter orientation of the rat brain and the generation of fiber orientation maps of the human brain in white and gray matter. The strengths and weaknesses of the method are set out. 相似文献
130.
Griffin LD 《IEEE transactions on pattern analysis and machine intelligence》2007,29(8):1355-1366
Characterization of second order local image structure by a 6D vector (or jet) of Gaussian derivative measurements is considered. We consider the affect on jets of a group of transformations-affine intensity-scaling, image rotation and reflection, and their compositions-that preserve intrinsic image structure. We show how this group stratifies the jet space into a system of orbits. Considering individual orbits as points, a 3D orbifold is defined. We propose a norm on jet space which we use to induce a metric on the orbifold. The metric tensor shows that the orbifold is intrinsically curved. To allow visualization of the orbifold and numerical computation with it, we present a mildly-distorting but volume-preserving embedding of it into euclidean 3-space. We call the resulting shape, which is like a flattened lemon, the second order local-image-structure solid. As an example use of the solid, we compute the distribution of local structures in noise and natural images. For noise images, analytical results are possible and they agree with the empirical results. For natural images, an excess of locally 1D structure is found. 相似文献