全文获取类型
收费全文 | 4291篇 |
免费 | 248篇 |
国内免费 | 114篇 |
专业分类
电工技术 | 53篇 |
综合类 | 172篇 |
化学工业 | 436篇 |
金属工艺 | 51篇 |
机械仪表 | 217篇 |
建筑科学 | 522篇 |
矿业工程 | 47篇 |
能源动力 | 41篇 |
轻工业 | 447篇 |
水利工程 | 32篇 |
石油天然气 | 20篇 |
武器工业 | 5篇 |
无线电 | 291篇 |
一般工业技术 | 331篇 |
冶金工业 | 68篇 |
原子能技术 | 142篇 |
自动化技术 | 1778篇 |
出版年
2024年 | 13篇 |
2023年 | 86篇 |
2022年 | 99篇 |
2021年 | 110篇 |
2020年 | 110篇 |
2019年 | 170篇 |
2018年 | 92篇 |
2017年 | 112篇 |
2016年 | 143篇 |
2015年 | 164篇 |
2014年 | 291篇 |
2013年 | 318篇 |
2012年 | 318篇 |
2011年 | 274篇 |
2010年 | 236篇 |
2009年 | 249篇 |
2008年 | 258篇 |
2007年 | 233篇 |
2006年 | 235篇 |
2005年 | 180篇 |
2004年 | 147篇 |
2003年 | 142篇 |
2002年 | 115篇 |
2001年 | 83篇 |
2000年 | 68篇 |
1999年 | 70篇 |
1998年 | 61篇 |
1997年 | 34篇 |
1996年 | 32篇 |
1995年 | 15篇 |
1994年 | 28篇 |
1993年 | 20篇 |
1992年 | 21篇 |
1991年 | 23篇 |
1990年 | 22篇 |
1989年 | 12篇 |
1988年 | 7篇 |
1987年 | 6篇 |
1986年 | 8篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 9篇 |
1982年 | 11篇 |
1981年 | 3篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有4653条查询结果,搜索用时 10 毫秒
61.
Jorge Lopez-Moreno Jorge JimenezSunil Hadap Ken AnjyoErik Reinhard Diego Gutierrez 《Computers & Graphics》2011,35(1):99-111
Recent works in image editing are opening up new possibilities to manipulate and enhance input images. Within this context, we leverage well-known characteristics of human perception along with a simple depth approximation algorithm to generate non-photorealistic renditions that would be difficult to achieve with existing methods. Once a perceptually plausible depth map is obtained from the input image, we show how simple algorithms yield powerful new depictions of such an image. Additionally, we show how artistic manipulation of depth maps can be used to create novel non-photorealistic versions, for which we provide the user with an intuitive interface. Our real-time implementation on graphics hardware allows the user to efficiently explore artistic possibilities for each image. We show results produced with six different styles proving the versatility of our approach, and validate our assumptions and simplifications by means of a user study. 相似文献
62.
Yanzhao Ma Junghoon KwonZhihong Mao Kunwoo Lee Linlin LiHayoung Chung 《International Journal of Industrial Ergonomics》2011,41(1):19-29
In this study, body segment parameters of Korean adults were estimated using the three-dimensional (3D) body scan data from the SizeKorea database. Mass-inertial parameters and segment dimensions of 40 male subjects and 40 female subjects (18-59 years old) were estimated using a 16-segment model under the assumption that each segment has a constant density distribution after reconstructing the scan data. Therefore, several sets of linear regression functions based on gender, stature, and weight were established, which provided a convenient method for estimating body segment parameters of Korean adults. The obtained mass ratios of body segments were compared with those for Russians reported by Zatsiorsky and Seluyanov (1983) and for those for Chinese and Germans reported by Shan and Bohn (2003), in which the same 16-segment model was used. In addition, the results were compared with the Korean data results reported by
[Jung, 1993] and [Lim, 1994], and Park et al. (1999). These comparisons revealed that Asians have larger head mass ratios and smaller lower limb mass ratios than Caucasians, while the differences in the head mass ratios between males and females from the same ethnic groups were not significant. Females were found to have larger mass ratios for the lower torso and smaller mass ratios for the upper torso, middle torso, upper arm, forearm, foot, and hand, as compared to males from the same ethnic groups. In addition, the data obtained by different researchers were compared, thereby showing high reproducibility of our method.
Relevance to industry
The obtained segment parameters can be used to define digital human models and applied to the fields of ergonomics and biomechanics, such as for workspace design, furniture design, vehicle interior design, and human movement analysis. 相似文献63.
This article describes a multiple feature data fusion applied to a particle filter for marker-less human motion capture (HMC) by using a single camera devoted to an assistant mobile robot. Particle filters have proved to be well suited to this robotic context. Like numerous approaches, the principle relies on the projection of the model's silhouette of the tracked human limbs and appearance features located on the model surface, to validate the particles (associated configurations) which correspond to the best model-to-image fits. Our particle filter based HMC system is improved and extended in two ways. First, our estimation process is based on the so-called AUXILIARY scheme which has been surprisingly seldom exploited for tracking purpose. This scheme is shown to outperform conventional particle filters as it limits drastically the well-known burst in term of particles when considering high dimensional state-space. The second line of investigation concerns data fusion. Data fusion is considered both in the importance and measurement functions with some degree of adaptability depending on the current human posture and the environmental context encountered by the robot. Implementation and experiments on indoor sequences acquired by an assistant mobile robot highlight the relevance and versatility of our HMC system. Extensions are finally discussed. 相似文献
64.
In a multicore transactional memory (TM) system, concurrent execution threads interact and interfere with each other through shared memory. The less interference a thread provokes the better for the system. However, as a programmer is primarily interested in optimizing her individual code’s performance rather than the system’s overall performance, she does not have a natural incentive to provoke as little interference as possible. Hence, a TM system must be designed compatible with good programming incentives (GPI), i.e., writing efficient code for the overall system should coincide with writing code that optimizes an individual thread’s performance. We show that with most contention managers (CM) proposed in the literature so far, TM systems are not GPI compatible. We provide a generic framework for CMs that base their decisions on priorities and explain how to modify Timestamp-like CMs so as to feature GPI compatibility. In general, however, priority-based conflict resolution policies are prone to be exploited by selfish programmers. In contrast, a simple non-priority-based manager that resolves conflicts at random is GPI compatible. 相似文献
65.
This paper proposes a fast and robust 3D human face geometric data registration strategy dedicated for image-guided medical
applications. The registration scheme is composed of a coarse transformation stage and a fine-tuning stage. In the first stage,
fuzzy c-mean is used to reduce the data amount of template 3D image, and evolutionary computation is implemented to find optimal
initial pose for the Iterative Closest Point plus k-dimensional (KD) tree scheme. In the second stage, the huge reference
image data are replaced by a Kriging model. The time-consuming search for corresponding points in evaluating the degree of
misalignment is substituted by projecting the points in the template image onto the model. To illustrate the validity and
applicability of the proposed approach, a problem composed of 174 635 points reference image and an 11 280 points template
image is demonstrated. Computational results show that our approach accelerates the registration process from 1361.28 seconds
to 432.85 seconds when compared with the conventional ICP plus K-D tree scheme, while the average misalignment reduces from
11.35 mm to 2.33 mm.
This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January
31–February 2, 2008 相似文献
66.
Brain impediments such as dementia are a serious problem today. It would be very useful if software for private diagnosis
were available. In this paper, we show the effectiveness of the human random generation test (HRG) for such software, and
propose a set of four indices to be used for classifying the HRG data. Human-generated random numbers have strong characteristics
compared to computer-generated random numbers, and these are known to be correlated to the individual characters of the subjects.
However, analysis using the correlation dimension or HMM requires a long data sequence, and thus is not suitable for diagnoses.
We therefore focus on short sequences of HRG and search for effective indices to detect signs of brain disability hidden in
the HRG data. We studied data from subjects of different age groups, and successfully differentiated the data from the different
groups.
This work was presented in part at the 12th International Symposium on Artificial Life and Robotics, Oita, Japan, January
25–27, 2007 相似文献
67.
Roman Rosipal Mark Girolami Leonard J. Trejo Andrzej Cichocki 《Neural computing & applications》2001,10(3):231-243
In this paper, we propose the application of the Kernel Principal Component Analysis (PCA) technique for feature selection
in a high-dimensional feature space, where input variables are mapped by a Gaussian kernel. The extracted features are employed
in the regression problems of chaotic Mackey–Glass time-series prediction in a noisy environment and estimating human signal
detection performance from brain event-related potentials elicited by task relevant signals. We compared results obtained
using either Kernel PCA or linear PCA as data preprocessing steps. On the human signal detection task, we report the superiority
of Kernel PCA feature extraction over linear PCA. Similar to linear PCA, we demonstrate de-noising of the original data by
the appropriate selection of various nonlinear principal components. The theoretical relation and experimental comparison
of Kernel Principal Components Regression, Kernel Ridge Regression and ε-insensitive Support Vector Regression is also provided. 相似文献
68.
Urine is a human specimen that is easily obtained non-invasively for clinical diagnosis. We attempted to enhance the resolution of current human urine proteomes and construct a comprehensive reference database for advanced studies, such as the discovery of biomarkers for renal diseases. Multi-dimensional LC-MS/MS was coupled with de novo sequencing and database matching. The proposed approach improved the identification of not only the proteins, but also the post-translational sites of urinary proteins. We identified 165, 200 and 259 unique gene products in the urine proteomes from males, females and pregnant women, respectively. When all of the results were combined and the redundancies removed, a total of 1095 distinct peptides were identified. Of these, 1016 peptides were associated with 334 unique gene products. In this study, over 100 gene products, including some disease-related proteins, were detected in urine for the first time by proteomic approaches. Various proteins with novel post-translational hydroxylation were identified using the MASCOT program and de novo sequencing. All proteins with peptide information were summarized into a comprehensive urine protein database. We believe that this comprehensive urine proteome database will assist in the identification of urinary proteins/polypeptides whose spectra are difficult to interpret in the discovery of urinary biomarkers. 相似文献
69.
Bubb H 《Applied ergonomics》2006,37(4):401-407
In this article, it is shown that human work can be understood as a process of creating order, and that order can be seen as a form of information. Since information can be considered as negative entropy, work is associated with energy consumption. Therefore, it is important to investigate the nature of human necessities in more detail in order to meet the desire for comfort through the efficient application of energy. Temporary increases of information cause accelerated increases in entropy. This explains the appearance of living organisms, and the historic development of increasingly complex technology. Through technical progress, repetitive human work is being replaced by automation, so that primarily creative work remains. Now the question arises of how much creative work a human can manage. In addition, one goal of automation should be the reduction of human errors, but in doing so, an optimal balance should be found between supporting the operator both during normal procedures and during unforeseen circumstances. 相似文献
70.
Subjective evaluation of software evolvability using code smells: An empirical study 总被引:2,自引:2,他引:0
This paper presents the results of an empirical study on the subjective evaluation of code smells that identify poorly evolvable
structures in software. We propose use of the term software evolvability to describe the ease of further developing a piece
of software and outline the research area based on four different viewpoints. Furthermore, we describe the differences between
human evaluations and automatic program analysis based on software evolvability metrics. The empirical component is based
on a case study in a Finnish software product company, in which we studied two topics. First, we looked at the effect of the
evaluator when subjectively evaluating the existence of smells in code modules. We found that the use of smells for code evaluation
purposes can be difficult due to conflicting perceptions of different evaluators. However, the demographics of the evaluators
partly explain the variation. Second, we applied selected source code metrics for identifying four smells and compared these
results to the subjective evaluations. The metrics based on automatic program analysis and the human-based smell evaluations
did not fully correlate. Based upon our results, we suggest that organizations should make decisions regarding software evolvability
improvement based on a combination of subjective evaluations and code metrics. Due to the limitations of the study we also
recognize the need for conducting more refined studies and experiments in the area of software evolvability.
相似文献
Casper LasseniusEmail: |