全文获取类型
| 收费全文 | 483篇 |
| 免费 | 8篇 |
专业分类
| 电工技术 | 7篇 |
| 综合类 | 1篇 |
| 化学工业 | 105篇 |
| 金属工艺 | 13篇 |
| 机械仪表 | 18篇 |
| 建筑科学 | 14篇 |
| 矿业工程 | 2篇 |
| 能源动力 | 36篇 |
| 轻工业 | 39篇 |
| 水利工程 | 5篇 |
| 石油天然气 | 6篇 |
| 无线电 | 49篇 |
| 一般工业技术 | 86篇 |
| 冶金工业 | 15篇 |
| 原子能技术 | 2篇 |
| 自动化技术 | 93篇 |
出版年
| 2024年 | 9篇 |
| 2023年 | 29篇 |
| 2022年 | 39篇 |
| 2021年 | 36篇 |
| 2020年 | 21篇 |
| 2019年 | 16篇 |
| 2018年 | 17篇 |
| 2017年 | 21篇 |
| 2016年 | 20篇 |
| 2015年 | 14篇 |
| 2014年 | 23篇 |
| 2013年 | 33篇 |
| 2012年 | 16篇 |
| 2011年 | 19篇 |
| 2010年 | 14篇 |
| 2009年 | 22篇 |
| 2008年 | 5篇 |
| 2007年 | 10篇 |
| 2006年 | 10篇 |
| 2005年 | 4篇 |
| 2004年 | 5篇 |
| 2003年 | 2篇 |
| 2002年 | 4篇 |
| 2001年 | 2篇 |
| 2000年 | 2篇 |
| 1999年 | 3篇 |
| 1998年 | 9篇 |
| 1997年 | 5篇 |
| 1996年 | 8篇 |
| 1995年 | 12篇 |
| 1994年 | 6篇 |
| 1993年 | 4篇 |
| 1992年 | 4篇 |
| 1990年 | 2篇 |
| 1988年 | 3篇 |
| 1987年 | 4篇 |
| 1986年 | 2篇 |
| 1985年 | 6篇 |
| 1984年 | 5篇 |
| 1979年 | 2篇 |
| 1978年 | 3篇 |
| 1977年 | 1篇 |
| 1976年 | 1篇 |
| 1974年 | 2篇 |
| 1973年 | 2篇 |
| 1972年 | 1篇 |
| 1971年 | 3篇 |
| 1970年 | 2篇 |
| 1967年 | 1篇 |
| 1966年 | 1篇 |
排序方式： 共有491条查询结果，搜索用时 15 毫秒
141.
M Monfort-Gouraud R Chokre M Dubiez T Ratsimihah A Hamza G Sauvageon 《Canadian Metallurgical Quarterly》1996,3(7):697-700
BACKGROUND: Orbital inflammatory lesions may be due to infection, neoplasia, systemic disease such as sarcoidosis or be idiopathic. CASE REPORT: A 13 year-old boy had uveitis and symptoms of unilateral periglobular orbital inflammation, confirmed by computed tomography. Infection and neoplasia were excluded. The serum angiotensin-converting enzyme level (ACE) was normal. Steroids were effective but three recurrences occurred with bilateralisation of the lesion. Serum ACE level increased making sarcoidosis probable. Moreover renal lesion were later found. Outcome was good with a prolonged steroid administration for ten months. CONCLUSIONS: Sarcoidosis may be revealed by an orbital inflammatory lesion. Steroids are necessary to prevent ocular functional complications. 相似文献
142.
Hamza Hammami Mohammad S. Obaidat Sadok Ben Yahia 《International Journal of Communication Systems》2020,33(15)
The smart grid is a new and promising technology integrating new information and communication technologies to improve the distribution and consumption of electricity between energy suppliers and their end customers. However, this advanced solution is facing a serious security problem as regards the interception and falsification of power consumption data, hence generating falsified electricity consumption bills. This issue of security needs to be promptly and efficiently handled. Clearly, it is of paramount importance to have a security mechanism to avoid such losses. Our work focuses on this issue. It particularly concerns the development of a security mechanism to ensure a completely secure communication between energy suppliers and their consumers while preserving the privacy of end customers in terms of protection of their personal information including their identities. The experimental results underscore that our solution outperforms those of the literature in terms of computation cost and robustness against various types of attacks. 相似文献
143.
144.
145.
Loop and Catmull-Clark are the most famous approximation subdivision schemes, but their limit surfaces do not interpolate the vertices of the given mesh. Progressive-iterative approximation (PIA) is an efficient method for data interpolation and has a wide range of applications in many fields such as subdivision surface fitting, parametric curve and surface fitting among others. However, the convergence rate of classical PIA is slow. In this paper, we present a new and fast PIA format for constructing interpolation subdivision surface that interpolates the vertices of a mesh with arbitrary topology. The proposed method, named Conjugate-Gradient Progressive-Iterative Approximation (CG-PIA), is based on the Conjugate-Gradient Iterative algorithm and the Progressive Iterative Approximation (PIA) algorithm. The method is presented using Loop and Catmull-Clark subdivision surfaces. CG-PIA preserves the features of the classical PIA method, such as the advantages of both the local and global scheme and resemblance with the given mesh. Moreover, CG-PIA has the following features. 1) It has a faster convergence rate compared with the classical PIA and W-PIA. 2) CG-PIA avoids the selection of weights compared with W-PIA. 3) CG-PIA does not need to modify the subdivision schemes compared with other methods with fairness measure. Numerous examples for Loop and Catmull-Clark subdivision surfaces are provided in this paper to demonstrate the efficiency and effectiveness of CG-PIA. 相似文献
146.
Hamza Boussebha Nurşen Mutlu Nuray Canikoğlu Ali O. Kurt 《International Journal of Applied Ceramic Technology》2022,19(6):2967-2978
Carbothermal reduction and nitridation (CRN) method, used for the synthesis of nitride-based ceramic powders, is an effective and economic technique that has been widely investigated. In this study, a CRN-based novel approach, denominated as dynamic/thermochemical method (DTM), has been used to synthesize submicron high-purity aluminum nitride (AlN) powders with equiaxed-sized particles. DTM is a modified CRN method in which the reaction takes place in a controlled atmosphere using a rotary tube furnace, allowing the synthesis of fine particle-size powders in a relatively short time. Following the DTM process, homogeneous submicron AlN powders were synthesized from a mixture of aluminum hydroxide (Al(OH)3) and carbon black at 1450°C for 1.5 h. Furthermore, dynamic synthesis parameters, as well as the use of ammonia (NH3) and propane (C3H8) gas mixtures instead of carbon black and nitrogen, were investigated. 相似文献
147.
Nidal M. Turab Hamza Abu Owida Jamal I. Al-Nabulsi Mwaffaq Abu-Alhaija 《计算机系统科学与工程》2022,40(1):167-177
The human body contains a near-infinite supply of energy in chemical, thermal, and mechanical forms. However, the majority of implantable and wearable devices are still operated by batteries, whose insufficient capacity and large size limit their lifespan and increase the risk of hazardous material leakage. Such energy can be used to exceed the battery power limits of implantable and wearable devices. Moreover, novel materials and fabrication methods can be used to create various medical therapies and life-enhancing technologies. This review paper focuses on energy-harvesting technologies used in medical and health applications, primarily power collectors from the human body. Current approaches to energy harvesting from the bodies of living subjects for self-powered electronics are summarized. Using the human body as an energy source encompasses numerous topics: thermoelectric generators, power harvesting by kinetic energy, cardiovascular energy harvesting, and blood pressure. The review considers various perspectives on future research, which can provide a new forum for advancing new technologies for the diagnosis, treatment, and prevention of diseases by integrating different energy harvesters with advanced electronics. 相似文献
148.
Hamza Elsayed Ahmad Mohamed;Ali Talha Khalil;Khaoula Hkiri;Muhammad Ayaz;Assad Usman;Abdul Sadiq;Farhat Ullah;Muhammad Arif Khan;Ikram Ullah;Malik Maaza; 《Microscopy research and technique》2024,87(12):2829-2841
Herein we described the biofabrication of samarium oxide nanoparticles (HT-Sm2O3 NPs) by applying the aqueous fruit extract of Hyphaene thebaica was utilized as an eco-friendly chelating agent. The prepared NPs were subjected to various physicochemical properties and potential in biomedical applications. X-ray Diffraction (XRD) pattern revealed sharp peaks that corroborated with the Joint Committee on Powder Diffraction Standards (JCPDS) card no. 00–042-1464. Crystallite size obtained from Debye–Scherrer approximation and Williamson–Hall (W–H) plot was 28.73 and 69.3 nm, respectively. Optical bandgap was calculated by employing Kubelka–Munk (K–M) function and was found to be ~4.58 eV. Raman shift was observed at 121, 351, 424—, and 561 cm−1. Photoluminescence (PL) spectra revealed two major peaks positioned at 360 and 540 nm. The high-resolution transmission electron microscopy (HR-TEM) analysis of HT-Sm2O3 nanoparticles (NPs) showed that they predominantly have spherical to cuboidal shapes. Additionally, the selected area electron diffraction (SAED) pattern presented spotty rings, indicating a high level of crystallinity in these NPs. The potential nanomedicine applications were studied using diverse bioassays using different treatments. The antioxidant activity demonstrated 45.71% ± 1.13% inhibition at 1000 μg/mL. Brine shrimp lethality assay revealed the highest cytotoxicity of 46.67% ± 3.33% at 1000 μg/mL and LC50 value of 1081 μg/mL. HT-Sm2O3 NPs exhibited inhibition of angiogenesis (20.41% ± 1.18%) at of 1000 μg/mL. MTT assay results indicated that HT-Sm2O3 NPs exhibit inhibitory effects on cell lines. Specifically, these NPs showed an IC50 value of 104.6 μg/mL against 3T3 cells. Against MCF-7 cells, the NPs demonstrated an IC50 value of 413.25 μg/mL. Additionally, in the inhibition of acetylcholinesterase (AChE), the newly synthesized NPs showed an IC50 value of 320 μg/mL. The antidiabetic assessment through α-glucosidase and α-amylase inhibition assays revealed, an IC50 value of 380 μg/mL for α-glucosidase and 952 μg/mL for α-amylase was calculated. Overall, our study suggested that the Sm2O3 NPs possess moderate anticancer, cholinesterase inhibition, and antidiabetic potential, however, needs further assessment. 相似文献
149.
Hamza Alrababah;Hena Iqbal;Muhammad Adnan Khan; 《国际智能系统杂志》2024,2024(1):9949510
The expanding importance of technology, particularly mobile banking, in the financial industry, is examined in this literature review, as well as the crucial role that cybersecurity knowledge plays in protecting online transactions. Users now have the flexibility to conduct payments whenever and wherever they wish thanks to the advent of mobile banking. Further consumer behavior study is necessary due to difficulties with its acceptability. Given the hazards involved in online and mobile banking, cybersecurity is revealed as a critical component. Users’ actions might lead to financial losses since they represent security concerns. The evaluation places a strong emphasis on the necessity of increasing user cybersecurity knowledge and comprehension. Wireless banking is still in its early phases and needs more study on consumer acceptability and behavior despite the greater accessibility of technology. Furthermore, the research study emphasizes the socio-technical difficulties governments encounter in tackling cybersecurity and emphasizes how urgently better readiness is needed in the face of cyberwarfare threats. It investigated how user behavior in mobile banking in particular geographic areas, such as Thailand, relates to cyberspace knowledge and consciousness. The assessment emphasizes the value of technology in banking, the difficulties associated with cybersecurity, and the demand for increased customer knowledge and comprehension to ensure safe digital transactions. To conduct this research activity, standardized questionnaires are used. The technique employed to get this data was convenience sampling. The statistics collection size stood at 500 and was gathered from males as well as females of all ages, belonging to diverse revenue groups, and numerous professional backgrounds. The survey finds that even while these services are becoming widespread in the UAE, customers’ awareness and understanding of cyber security are still insufficient. Users frequently underrate the security dangers involved with online transactions, which might create openings. Additionally, the study underlines the necessity of more effective training programs and efforts to raise mobile banking consumers’ knowledge of cybersecurity issues. It also emphasizes how crucial it is to build cybersecurity precautions into the structure and functioning of services for mobile banking. The purpose of this study was to examine the demographic characteristics of consumers and companies (online transactions) that use mobile banking apps to get special advantages. It was shown that people’s satisfaction with mobile banking applications was influenced by a number of criteria, including age, employment, income, marital status, and educational attainment. Younger consumers, such as students and recent graduates, are seen to be happy than customers of various ages and vocations, and males are thought to be happier than women. 相似文献
150.