全文获取类型
收费全文 | 318篇 |
免费 | 27篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 6篇 |
综合类 | 3篇 |
化学工业 | 84篇 |
金属工艺 | 3篇 |
机械仪表 | 20篇 |
建筑科学 | 7篇 |
能源动力 | 12篇 |
轻工业 | 61篇 |
水利工程 | 2篇 |
石油天然气 | 3篇 |
无线电 | 43篇 |
一般工业技术 | 57篇 |
冶金工业 | 14篇 |
自动化技术 | 31篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 14篇 |
2021年 | 19篇 |
2020年 | 14篇 |
2019年 | 13篇 |
2018年 | 22篇 |
2017年 | 11篇 |
2016年 | 21篇 |
2015年 | 9篇 |
2014年 | 10篇 |
2013年 | 36篇 |
2012年 | 14篇 |
2011年 | 22篇 |
2010年 | 14篇 |
2009年 | 13篇 |
2008年 | 14篇 |
2007年 | 13篇 |
2006年 | 14篇 |
2005年 | 8篇 |
2004年 | 6篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 7篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1975年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有346条查询结果,搜索用时 15 毫秒
51.
Elena Cris Paola Boggione Maura Nicolosi Abdurraouf Mokhtar Mahmoud Wael Al Essa Bassel Awikeh Anna Aspesi Annalisa Andorno Renzo Boldorini Irma Dianzani Gianluca Gaidano Andrea Patriarca 《International journal of molecular sciences》2021,22(5)
Myelodysplastic syndromes (MDS) arising in the context of inherited bone marrow failure syndromes (IBMFS) differ in terms of prognosis and treatment strategy compared to MDS occurring in the adult population without an inherited genetic predisposition. The main molecular pathways affected in IBMFS involve telomere maintenance, DNA repair, biogenesis of ribosomes, control of proliferation and others. The increased knowledge on the genes involved in MDS pathogenesis and the wider availability of molecular diagnostic assessment have led to an improvement in the detection of IBMFS genetic predisposition in MDS patients. A punctual recognition of these disorders implies a strict surveillance of the patient in order to detect early signs of progression and promptly offer allogeneic hematopoietic stem cell transplantation, which is the only curative treatment. Moreover, identifying an inherited mutation allows the screening and counseling of family members and directs the choice of donors in case of need for transplantation. Here we provide an overview of the most recent data on MDS with genetic predisposition highlighting the main steps of the diagnostic and therapeutic management. In order to highlight the pitfalls of detecting IBMFS in adults, we report the case of a 27-year-old man affected by MDS with an underlying telomeropathy. 相似文献
52.
53.
The aim of this paper is to establish and validate a portable device for the local three dimensional deformation measurements using a single camera combined with a triangular prism mirror and two mirrors. The mirrors were utilized to convert a single camera into a stereo image system, which views a test object from two different directions and records the surface images of the test specimen on the two halves of the camera sensor in order to achieve a three-dimensional measurement. The proposed system consists of a single camera and the reflection system was integrated into a portable device to achieve a truly portable, low-cost,local three-dimensional deformation measurement, one-time calibration and easy implementation in situ. The optical design and measurement procedures to obtain the three-dimensional(3 D) deformation measurements of the proposed system were described in detail. The efficiency and precision of the proposed system were verified by measuring the displacements of a translated flat plate. As a practical application, the proposed system is used to measure the out-of-plane displacement of an aluminum circular plate with a central load. Moreover, the normal strain measurement of a plastic beam under symmetric four-point bending via an outer loading frame was also presented. The measurement results are in good accordance with the data obtained by strain gauges. The experimental results revealed that the proposed system was practicable and effective for the local three-dimensional deformation measurement. This system well-suited to both laboratory and field condition and will have significant application in the fields of engineering. 相似文献
54.
Khan Nabeel Ali Mohammadi Mokhtar Ghafoor Mubeen Tariq Syed Ali 《Multidimensional Systems and Signal Processing》2022,33(3):1071-1071
Multidimensional Systems and Signal Processing - 相似文献
55.
Ahmad H. A. Rosol Afiq A. A. Jafry Norrima Mokhtar Moh Yasin Sulaiman Wadi Harun 《光电子快报》2021,17(8):449-453
Passively Q-switched thulium doped fiber laser (TDFL) has been successfully demonstrated using gold nanoparticles (GNPs), which were embedded into polyvinyl alcohol as saturable absorber (SA). The stable self-starting Q-switched laser was generated to operate at 1 891 nm when a tiny piece of the prepared film was slot in between two fiber ferrules and incorporated into the laser cavity. The repetition rate can be adjusted from 48.54 kHz to 49.64 kHz while the pulse width decreased from 3.52 μs to 2.38 μs with the increase of 1 550 nm pump power from 840 mW to 930 mW. The corresponding pump power output power linearly increased from 3.62 mW to 6.3 mW with a slope efficiency of 2.53%. The maximum peak power and pulse energy were recorded at about 39 mW and 0.12 µJ, respectively at pump power of 930 mW. The Q-switching operation was caused by the surface plasmon resonance absorption of GNPs. 相似文献
56.
Khiloun Mokhtar Bousahla Abdelmoumen Anis Kaci Abdelhakim Bessaim Aicha Tounsi Abdelouahed Mahmoud S. R. 《Engineering with Computers》2020,36(3):807-821
Engineering with Computers - This work presents an efficient and original high-order shear and normal deformation theory for the static and free vibration analysis of functionally graded plates.... 相似文献
57.
Sum‐of‐Squares‐Based Finite‐Time Adaptive Sliding Mode Control of Uncertain Polynomial Systems With Input Nonlinearities
下载免费PDF全文
![点击此处可从《Asian journal of control》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Mohammad Mehdi Mardani Navid Vafamand Mostafa Shokrian Zeini Mokhtar Shasadeghi Alireza Khayatian 《Asian journal of control》2018,20(4):1658-1662
This paper proposes a novel adaptive sliding mode control (ASMC) for a class of polynomial systems comprising uncertain terms and input nonlinearities. In this approach, a new polynomial sliding surface is proposed and designed based on the sum‐of‐squares (SOS) decomposition. In the proposed method, an adaptive control law is derived such that the finite‐time reachability of the state trajectories in the presence of input nonlinearity and uncertainties is guaranteed. To do this, it is assumed that the uncertain terms are bounded and the input nonlinearities belong to sectors with positive slope parameters. However, the bound of the uncertain terms is unknown and adaptation law is proposed to effectively estimate the uncertainty bounds. Furthermore, based on a novel polynomial Lyapunov function, the finite‐time convergence of the sliding surface to a pre‐chosen small neighborhood of the origin is guaranteed. To eliminate the time derivatives of the polynomial terms in the stability analysis conditions, the SOS variables of the Lyapunov matrix are optimally selected. In order to show the merits and the robust performance of the proposed controller, chaotic Chen system is provided. Numerical simulation results demonstrate chattering reduction in the proposed approach and the high accuracy in estimating the unknown parameters. 相似文献
58.
Mohamed Jleli Mokhtar Kirane Bessem Samet 《Computers & Mathematics with Applications》2018,75(8):2698-2709
In this paper, we study the nonlocal nonlinear evolution equation where , , , , is the convolution product in , and , , is the Caputo left-sided fractional derivative of order with respect to the time . We prove that the problem admits no global weak solution other than the trivial one with suitable initial data when . Next, we deal with the system where , , , and . We prove that the system admitsnon global weak solution other than the trivial one with suitable initial data when . Our approach is based on the test function method. 相似文献
59.
Adel Mokhtar Amal Djelad Abdelkader Boudia Mohamed Sassi Abdelkader Bengueddach 《Journal of Porous Materials》2017,24(6):1627-1636
The purpose of this work is the synthesis of two series of layered silicate materials with different ratios (10, 30, 50, 80 and 100) of Cu(NO3)2, or Zn(NO3)2 by ion-exchange method. Several analysis techniques have been used such as X-ray diffraction, energy dispersive X-ray spectroscopy, thermogravimetric analysis, scanning electron microscope and Fourier transform infrared spectroscopy. The results revealed that ion-exchange method of copper and zinc with different ratios did not affect the structure of Na-magadiite. The gap between the theoretical and experimental ion-exchange are in agreement. Antibacterial activity test against Escherichia coli, Rhizobium sp. and Staphylococcus demonstrate that when ratio was (30, 50, 80 and 100) the antibacterial activity of the layered silicate materials showed high antibacterial activity. 相似文献
60.
Mahmoodzadeh Arsalan Mohammadi Mokhtar Daraei Ako Farid Hama Ali Hunar Ismail Abdullah Abdulqadir Kameran Al-Salihi Nawzad 《Neural computing & applications》2021,33(1):321-348
Neural Computing and Applications - This research intends to use machine learning approaches to predict tunnel geology and its construction time and costs. For this purpose, the Gaussian Process... 相似文献