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排序方式: 共有110条查询结果,搜索用时 15 毫秒
1.
Golam Haider Krishna Sampathkumar Tim Verhagen Lukáš Nádvorník Farjana J. Sonia Václav Valeš Jan Sýkora Peter Kapusta Petr Němec Martin Hof Otakar Frank Yang-Fang Chen Jana Vejpravová Martin Kalbáč 《Advanced functional materials》2021,31(29):2102196
Recent advancements in isolation and stacking of layered van der Waals materials have created an unprecedented paradigm for demonstrating varieties of 2D quantum materials. Rationally designed van der Waals heterostructures composed of monolayer transition-metal dichalcogenides (TMDs) and few-layer hBN show several unique optoelectronic features driven by correlations. However, entangled superradiant excitonic species in such systems have not been observed before. In this report, it is demonstrated that strong suppression of phonon population at low temperature results in a formation of a coherent excitonic-dipoles ensemble in the heterostructure, and the collective oscillation of those dipoles stimulates a robust phase synchronized ultra-narrow band superradiant emission even at extremely low pumping intensity. Such emitters are in high demand for a multitude of applications, including fundamental research on many-body correlations and other state-of-the-art technologies. This timely demonstration paves the way for further exploration of ultralow-threshold quantum-emitting devices with unmatched design freedom and spectral tunability. 相似文献
2.
3.
Jose Andre Morales Peter J. Clarke Yi Deng B. M. Golam Kibria 《Journal in Computer Virology》2008,4(3):221-234
New viruses spread faster than ever and current signature based detection do not protect against these unknown viruses. Behavior
based detection is the currently preferred defense against unknown viruses. The drawback of behavior based detection is the
ability only to detect specific classes of viruses or have successful detection under certain conditions plus false positives.
This paper presents a characterization of virus replication which is the only virus characteristic guaranteed to be consistently
present in all viruses. Two detection models based on virus replication are developed, one using operation sequence matching
and the other using frequency measures. Regression analysis was generated for both models. A safe list is used to minimize
false positives. In our testing using operation sequence matching, over 250 viruses were detected with 43 subsequences. There
were minimal false negatives. The replication sequence of just one virus detected 130 viruses, 45% of all tested viruses.
Our testing using frequency measures detected all test viruses with no false negatives. The paper shows that virus replication
can be identified and used to detect known and unknown viruses. 相似文献
4.
Mohammad M. Hailat Ahsan Mian Zariff A. Chaudhury Golam Newaz Rahul Patwa Hans J. Herfurth 《Microsystem Technologies》2012,18(1):103-112
In this paper continuous laser welding of two dissimilar materials, aluminum and copper, was investigated. The aluminum and
the copper utilized were Al3003-H14 and Cu110-H00, respectively. Two different sets of samples were laser welded; one in which
a filler material, tin foil alloy (S-bond 220), was sandwiched between the aluminum and the copper and another set in which
the aluminum and copper were directly welded without any filler. The foil alloy was utilized to enhance the compatibility
of the two metals; aluminum and copper, reducing the brittleness of the intermetallic compound that may form and, subsequently,
enhance the mechanical properties. The welding was carried out using an IPG 500 SM fiber laser. The length of the laser joint
produced was 20 mm and the width was about 200 μm. The strength of the joint was evaluated by conducting the lap shear stress
test. Samples in which filler foil was used exhibited a better performance in the lap shear stress test (an average of 780 N)
than the samples without tin foil (an average of 650 N). The improvement in the lap shear test could be attributed to the
positive effects of the filler on enhancing the compatibility of the intermetallic compound formed via diffusion. The fracture
surface of both types of joints (with and without filler) was characterized using scanning electron microscope equipped with
energy-dispersive X-ray (EDAX). To understand the failure initiation and propagation of the samples under tension, a finite
element (FE) model was developed for the samples created with no filler material. The failure mechanism predicted from the
FE model matches reasonably well with the experimental observations from EDAX analysis. 相似文献
5.
Mohammad Rabiul Basher Rubel Daisy Mui Hung Kee Nadia Newaz Rimi Yusliza Mohd Yusoff 《Behaviour & Information Technology》2017,36(3):281-293
This study is designed to empirically test a model of high-involvement human resource management (HIHRM), organisational trust, and technology adaptation grounded on social exchange theory in the context of the private banking sector. The proposed model intends to add to the understanding of the effect of HIHRM on technology adaptation via the mediating influence of organisational trust. Frontline employees were surveyed using a self-administered questionnaire. Results from partial least square-structural equation modelling suggest that there is a significant influence of HIHRM on technology adaptation. Organisational trust further mediates the relationship. Thus, this paper finds an answer to the ‘black box’ of human resource management (HRM) practices, explaining how HIHRM influences employees’ attitudes towards technology adaptation. The study can help management have a better understanding of the importance of employee involvement-oriented HRM in introducing and implementing a new technology through the integration of trust processes in the organisation. 相似文献
6.
E. Mancini F. Campana M. Sasso G. Newaz 《The International Journal of Advanced Manufacturing Technology》2012,61(1-4):63-72
In cold rolling some surface defects, known as pits, are due to lubricant that, entrapped in the deep valleys of the surface roughness, is nearly incompressible and acts like an inclusion avoiding microcavity elimination. During the rolling process, when specific favorable conditions can be set up, the lubricant may be expelled by the microplasto-hydrodynamic lubrication (MPHL) mechanism and pits may be recovered. In this paper the Λm parameter, index of the MPHL, is investigated together with the neutral point position to better understand the practical process recommendations for surface defect recovery. By means of finite element analysis of a Sendzimir’cold rolling process, the sensitivity of these objective functions are studied by means of a design of experiment analysis changing the major process variables like back tension, friction coefficient, reduction parameter, initial thickness, and roll diameter. 相似文献
7.
Thermoplastic composites in general have been found to display improved resistance to impact damage over their thermosetting counterparts. However, in earlier work, we presented data that suggested that in poly(etheretherketone) (PEEK) based composites, damage tolerance may be adversely affected if cooling rates are too slow in the processing of these parts. In this work, ultrasonic C-scan and compression-after-impact testing were implemented on PEEK APC-2 plaques cooled at three different cooling rates, in addition to toughened epoxy and bismaleimide plaques processed conventionally as a comparison. It was found that the damaged areas as measured ultrasonically varied significantly between the PEEK samples cooled at different rates, and that under the slowest cooling conditions, the damaged areas approached those of the thermosetting systems tested. However, because compressive strengths before impact were found to be greater on slow cooling, the differences in compression-after-impact were less dramatic than one would have expected from the C-scan results alone. Variations in crystallinity as well as spherulite size were the source for the differences in damaged areas as well as in compressive strength. 相似文献
8.
Mohammad Maududul Huq Md. Robiur Rahman Masnun Naher Mohammad Mizanur Rahman Khan Mostafa Kamal Masud Golam Mohammad Golzar Hossain Nianyong Zhu Yih Hsing Lo Muhammad Younus Wai-Yeung Wong 《Journal of Inorganic and Organometallic Polymers and Materials》2016,26(6):1243-1252
Two palladium(II) nitroaryl complexes trans-[bromo(p-nitrophenyl)bis(triphenylphosphine)palladium(II)] 1 and trans-[bromo(2,4-dinitrophenyl)bis(triphenylphosphine)palladium(II)] 2 have been synthesized. The complexes were characterized by FTIR and NMR (1H, 13C and 31P) spectroscopy and elemental analysis. The molecular structure of complex 2, as confirmed by X-ray crystallography, reveals that the Pd atom and its neighboring groups (two PPh3, Br and phenylene group) lie in a slightly distorted square plane. In the UV–Vis spectra of the complexes 1 and 2, the palladium to aryl charge transfer bands were observed. The emission peaks from the singlet excited states (S1 → S0) were observed in the photoluminescence spectra of the complexes. The thermal stability of the complexes has been studied by thermal gravimetric analysis (TGA). TGA data showed that both complexes are thermally stable up to 200 °C, and complex 1 is more stable than 2. The catalytic efficiency of the new palladium(II) complexes was studied as demonstrated using the Sonogashira coupling reactions with good yields. The experimental results suggest that the Sonogashira coupling reactions can be performed at moderate temperature (50 °C) using these new palladium(II) complexes as catalysts. 相似文献
9.
Md. Golam Mostofa J. H. Noh H. Y. Kim J. H. Ahn D. B. Kang 《Journal of Mechanical Science and Technology》2010,24(8):1623-1629
PMMA optical components that are used as one of the most important parts of high precision equipments and machines are increasingly
replacing the glass due to the various advantages of PMMA. Especially in Light Guide Panels, the PMMA sheet that is used in
Liquid Crystal Displays plays an important role in scattering the incident light and requires very fine machining as the sheet
is directly related to the optical characteristics of the panels. The High Speed End milling and High Speed Shaping processes
that are widely adopted and applied to the precise machining of Light Incident Plane still have quality problems, such as
cracks, breakages, poor waviness, and straightness. This paper presents the tooling device design for machining a Light Incident
Plane through vibration-assisted High Speed Shaping for increasing the optical quality by minimizing the above-mentioned problems.
The cutting tool and the tool post presented in this paper are designed by the authors to increase the magnitude of the cutting
stroke by adopting the resonant frequency without weakening the stiffness and to reduce vibrations during even high speed
feeding. The dynamic characteristics of the cutting tool and the tool post are evaluated through simulation and experiment
as well. The results reveal very appropriate dynamic characteristics for vibration-assisted High Speed Shaping. 相似文献
10.