全文获取类型
收费全文 | 164篇 |
免费 | 13篇 |
专业分类
电工技术 | 7篇 |
化学工业 | 37篇 |
机械仪表 | 4篇 |
建筑科学 | 4篇 |
能源动力 | 1篇 |
轻工业 | 12篇 |
水利工程 | 1篇 |
无线电 | 15篇 |
一般工业技术 | 35篇 |
冶金工业 | 6篇 |
自动化技术 | 55篇 |
出版年
2022年 | 3篇 |
2021年 | 7篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 6篇 |
2017年 | 4篇 |
2016年 | 6篇 |
2015年 | 9篇 |
2014年 | 11篇 |
2013年 | 16篇 |
2012年 | 16篇 |
2011年 | 11篇 |
2010年 | 3篇 |
2009年 | 4篇 |
2008年 | 11篇 |
2007年 | 6篇 |
2006年 | 10篇 |
2005年 | 8篇 |
2004年 | 3篇 |
2003年 | 1篇 |
2002年 | 5篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有177条查询结果,搜索用时 15 毫秒
51.
The photochemical nucleophile-olefin combination, aromatic substitution (photo-NOCAS) reaction has been a cornerstone of research in our laboratory for several years. In this Account we present an overview of the mechanistic exploration and rationalization of this photoinduced electron transfer reaction. We have investigated the mechanism and defined the synthetic scope and limitations by variations in reaction conditions and structural modification of the substrates. During our studies, we have come across several other pathways in competition with the photo-NOCAS reaction that dominate once specific conditions are altered. These alternative reactions are also discussed briefly. 相似文献
52.
Time-focused clustering of trajectories of moving objects 总被引:5,自引:0,他引:5
Spatio-temporal, geo-referenced datasets are growing rapidly, and will be more in the near future, due to both technological
and social/commercial reasons. From the data mining viewpoint, spatio-temporal trajectory data introduce new dimensions and,
correspondingly, novel issues in performing the analysis tasks. In this paper, we consider the clustering problem applied
to the trajectory data domain. In particular, we propose an adaptation of a density-based clustering algorithm to trajectory
data based on a simple notion of distance between trajectories. Then, a set of experiments on synthesized data is performed
in order to test the algorithm and to compare it with other standard clustering approaches. Finally, a new approach to the
trajectory clustering problem, called temporal focussing, is sketched, having the aim of exploiting the intrinsic semantics of the temporal dimension to improve the quality of trajectory
clustering.
The authors are members of the Pisa KDD Laboratory, a joint research initiative of ISTI-CNR and the University of Pisa: . 相似文献
53.
The paper presents the development of segmented artificial crawlers endowed with passive hook-shaped frictional microstructures.
The goal is to find design rules for fabricating biomimetic, adaptable and mobile machines mimicking segmented animals with
hydrostatic skeleton, and intended to move effectively along unstructured substrates.
The paper describes the mechanical model, the design and the fabrication of a SMA-actuated segmented microrobot, whose locomotion
is inspired by the peristaltic motion of Annelids, and in particular of earthworms (Lumbricus Terrestris). Experimental locomotion performance are compared with theoretical performance predicted by a purposely developed friction
model -taking into account design parameters such as number of segments, body mass, special friction enhancement appendixes—and
with locomotion performance of real earthworms as presented in literature.
Experiments indicate that the maximum speed of the crawler prototype is 2.5 mm/s, and that 3-segment crawlers have almost
the same velocity as earthworms having the same weight (and about 330% their length), whereas 4-segment crawlers have the
same velocity, expressed as body lengths/s, as earthworms with the same mass (and about 270% their length).
Arianna Menciassi (MS, 1995; PhD, 1999) joined the CRIM Lab of the Scuola Superiore Sant’Anna (Pisa, Italy) as a Ph.D. student in Bioengineering
with a research program on the micromanipulation of mechanical and biological micro-objects. The main results of the activity
on micromanipulation were presented at the IEEE International Conference on Robotics & Automation (May 2001, Seoul) in a paper
titled “Force Feedback-based Microinstrument for Measuring Tissue Properties and Pulse in Microsurgery”, which won the “ICRA2001
Best Manipulation Paper Award”. In the year 2000, she was offered a position of Assistant Professor in Biomedical Robotics
at the Scuola Superiore Sant’Anna and in June 2006 she obtained a promotion to Associate Professor. Her main research interests
are in the field of biomedical microrobotics, biomimetics, microfabrication technologies, micromechatronics and microsystem
technologies. She is working on several European projects and international projects for the development of minimally invasive
instrumentation for medical applications and for the exploitation of micro- and nano-technologies in the medical field.
Samuele Gorini received his Laurea Degree in Mechanical Engineering (with honors) from the University of Pisa, Italy, in 2001. In 2005 he
obtained the Ph.D. in Microsystem Engineering with a thesis on locomotion methods and systems for miniaturised endoscopic
devices. Since 2000, he has been working at the CRIM Lab of the Scuola Superiore Sant’Anna in Pisa, Italy. His research interests
are in the field of biomedical robotics with a special focus on actuation technologies. Starting from the year 2004 he has
been president of Era Endoscopy S.r.l., a start-up company of Scuola Superiore Sant’Anna developing novel devices for endoscopy.
Dino Accoto (MS 1998, PhD 2002) is Assistant Professor of Biomedical Engineering at Scuola Sant’Anna (Pisa, Italy). He received the Laurea
degree in Mechanical Engineering from the University of Pisa (cum laude) in 1998, the diploma in Engineering from the Scuola
Sant’Anna (cum laude) in 1999 and the PhD degree from the Scuola Sant’Anna in 2002. From October 2001 to September 2002 he
has been visiting scholar at the RPL-Lab, Stanford University (Ca, USA). Since 2004 he cooperates with the Biomedical Robotics
& EMC Lab at Campus Bio-Medico University in Rome. His main research field is the modelling and development of small electromechanical
systems, with a special attention to multi-physics and multi-domain approaches. The research, often inspired by the analysis
of natural mechanisms, has been mainly applied to hybridizing microtechnologies, including microfluidics, and robotics. He
has co-authored more than 30 papers, appeared in international journals and conference proceedings.
Paolo Dario received his Dr. Eng. Degree in Mechanical Engineering from the University of Pisa, Italy, in 1977. He is currently a Professor
of Biomedical Robotics at the Scuola Superiore Sant’Anna in Pisa.. He also teaches courses at the School of Engineering of
the University of Pisa and at the Campus Biomedico University in Rome. He has been Visiting Professor at Brown University,
Providence, RI, USA, at the Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland, at Waseda University,
Tokyo, Japan, at the College de France, Paris, and at the Ecole Normale Superieure de Cachan, France. He was the founder of
the ARTS (Advanced Robotics Technologies and Systems) Laboratory and is currently the Co-ordinator of the CRIM (Center for
the Research in Microengineering) Laboratory of the Scuola Superiore Sant’Anna, where he supervises a team of about 70 researchers
and Ph.D. students. His main research interests are in the fields of medical robotics, bio-robotics, mechatronics and micro/nanoengineering,
and specifically in sensors and actuators for the above applications, and in robotics for rehabilitation. He is the coordinator
of many national and European projects, the editor of two books on the subject of robotics, and the author of more than 200
scientific papers (75 on ISI journals). He is Editor-in-Chief, Associate Editor and member of the Editorial Board of many
international journals. Prof. Dario has served as President of the IEEE Robotics and Automation Society in the years 2002–2003.
He has been the General Chair of the IEEE RAS-EMBS BioRob’06 Conference and he is the General Co-Chair of ICRA 2007 Conference.
Prof. Dario is an IEEE Fellow, a Fellow of the European Society on Medical and Biological Engineering, and a recipient of
many honors and awards, such as the Joseph Engelberger Award. He is also a member of the Board of the International Foundation
of Robotics Research (IFRR). 相似文献
54.
The purpose of this research study is to study the sustainable manufacturing practices across industrial sectors and to identify
the critical factors for its success implementation. In spite of the fact that sustainable manufacturing has been frequently
promoted as a means of improving business competitiveness, small empirical evidence exists in the literature validating its
positive link with organizational performance. Sustainable manufacturing practices enable the manufacturing organizations
to survive in the competitive environment. For this purpose, empirical data are collected to measure the sustainable manufacturing
practices prevailing across different industries located in Tamil Nadu, India. Structural equation modeling (SEM) technique
is used to build the measurement and structural models. After that, statistical estimates are used to validate the built model.
The data analysis enables the acceptance or rejection of the hypothesis that has been stated on the basis of structural model.
The results show the correlation between sustainable manufacturing practices and organizational performance among the industries
being surveyed. 相似文献
55.
56.
57.
58.
Francesco Bonchi Fosca Giannotti Alessio Mazzanti Dino Pedreschi 《Knowledge and Information Systems》2005,8(2):131-153
The key point of this article is that, in frequent pattern mining, the most appropriate way of exploiting monotone constraints in conjunction with frequency is to use them in order to reduce the input data; this reduction in turn induces a stronger pruning of the search space of the problem. Following this intuition, we introduce ExAMiner, a breadth-first algorithm that exploits the real synergy of antimonotone and monotone constraints: the total benefit is greater than the sum of the two individual benefits. ExAMiner generalizes the basic idea of the preprocessing algorithm ExAnte (Bonchi et al. 2003(b)), embedding such ideas at all levels of an Apriori-like computation. The resulting algorithm is the generalization of the Apriori algorithm when a conjunction of monotone constraints is conjoined to the frequency antimonotone constraint. Experimental results confirm that this is, so far, the most efficient way of attacking the computational problem in analysis. 相似文献
59.
Incoronata Tritto Laura Boggioni Cristina Zampa Maria Carmela Sacchi Dino R. Ferro 《Topics in Catalysis》2006,40(1-4):151-161
The microstructure of ethylene (E)-norbornene (N) copolymers obtained by C
s-symmetric i-Pr[(Cp)(9-Flu)]ZrCl2 (1) and C
1-symmetric i-Pr[(3-R-Cp)(9-Flu)]ZrCl2 (R = Me (2); R = i-Pr (3)) was determined by 13C NMR at tetrad (1) and pentad level (2, 3), respectively. This has allowed to study the influence of Cp substitutions on the statistical model of copolymerizations:
Markov 1 statistics for 1 and 2; Markov 2 for 3, where the penultimate unit influences next insertion owing to steric interactions between i-Pr and copolymer chain. The presence of only racemic ENNE sequences in E–N copolymers by 1 shows that copolymerizations occur through chain migratory mechanism. Chain backskips account for the formation of both meso and rac NEN sequences with 1 and for the insertion of N and E at the same site of 2 and 3. 相似文献
60.