首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   149篇
  免费   5篇
电工技术   8篇
综合类   2篇
化学工业   31篇
金属工艺   11篇
机械仪表   1篇
建筑科学   2篇
能源动力   5篇
轻工业   7篇
无线电   12篇
一般工业技术   57篇
冶金工业   2篇
自动化技术   16篇
  2023年   1篇
  2022年   10篇
  2021年   15篇
  2020年   7篇
  2019年   10篇
  2018年   5篇
  2017年   5篇
  2016年   7篇
  2015年   1篇
  2014年   15篇
  2013年   14篇
  2012年   15篇
  2011年   15篇
  2010年   10篇
  2009年   7篇
  2008年   7篇
  2006年   2篇
  2005年   3篇
  2004年   1篇
  2003年   1篇
  2001年   1篇
  1993年   1篇
  1982年   1篇
排序方式: 共有154条查询结果,搜索用时 31 毫秒
61.
The growth of the software game development industry is enormous and is gaining importance day by day. This growth imposes severe pressure and a number of issues and challenges on the game development community. Game development is a complex process, and one important game development choice is to consider the developer’s perspective to produce good-quality software games by improving the game development process. The objective of this study is to provide a better understanding of the developer’s dimension as a factor in software game success. It focuses mainly on an empirical investigation of the effect of key developer’s factors on the software game development process and eventually on the quality of the resulting game. A quantitative survey was developed and conducted to identify key developer’s factors for an enhanced game development process. For this study, the developed survey was used to test the research model and hypotheses. The results provide evidence that game development organizations must deal with multiple key factors to remain competitive and to handle high pressure in the software game industry. The main contribution of this paper is to investigate empirically the influence of key developer’s factors on the game development process.  相似文献   
62.
63.
64.
It's common sense to state that the production of any software product involves a human element, at least to some extent. We all have different personality traits, and the way we perceive, plan, and execute any activity is influenced by these characteristics. Typically, software development is a product of teamwork, involving several people performing various tasks. The success and failure of software projects reveal the human factor as one of vital importance. Not everyone can excel at every task, thus better results are achieved if people with particular personality traits are assigned to different aspects of a project, especially the roles best suited to their ability. The authors mapped some opposing psychological traits, such as extroversion-introversion, sensing-intuition, thinking-feeling, and judging-perceiving, to the main stages of a software development life cycle. Consequently, they concluded that assigning a person with specific psychological characteristics to the stage of the software life cycle best suited for his or her traits increases the chances of a successful outcome for the project.  相似文献   
65.
In this work, nanocrystalline titanium nitride (TiN) films have been deposited by reactive DC magnetron sputtering technique on the Si/SiO2 (100) substrates. The influence of nitrogen gas flow rate [0, 3, 5, 7 and 9 sccm (standard cubic centimeter per minute)] on the structural, morphological and electrical properties of the nanocrystalline TiN films has been studied. As-deposited TiN films have been characterized by using X-ray diffraction (XRD), XPS (X-ray photoelectron spectroscopy), FESEM (field emission scanning electron microscopy) and four point probe resistivity measurement, respectively. The XRD patterns revealed the HCP symmetry for pure Ti (N2 = 0 sccm) with (002) preferred orientations, and the FCC symmetry for TiN (N2 = 3, 5, 7 and 9 sccm) films having (111) preferred orientations. The lattice parameters were found to be a = 2.950 ?, c = 4.681? for the Ti (N2 = 0 sccm) film and a = 4.250Å for the TiN films. The presence of different phases such as TiN and TiO2 were confirmed by XPS analysis. The FESEM images showed a smooth morphology of the film with columnar grain structures. The grain size of the TiN films was found to decrease from 22 to 15 nm as the nitrogen flow rate is increased from 0 to 9 sccm. The electrical resistivity measurement showed that the resistivity of the film increased from 11 × 10?6 to 17 × 10?6 Ohm cm on increasing nitrogen flow rate from 3 to 9 sccm, having the lowest resistivity of 11 × 10?6 Ohm cm for the film deposited at 3 sccm nitrogen flow.  相似文献   
66.
Iron (Fe) deficiency is the most common nutritional problem among children and lead (Pb) toxicity is the most common environmental health threat to children all over the world. The objective of this study was to determine blood lead (BPb) levels and prevalence of Fe deficient anemia among 1 to 5 year old children attending day care clinic in pediatric ward of civil hospital Karachi, Pakistan. A total of 340 children of both genders participating in this study, were screened for anemia. Among them 215 were anemic and 125 non-anemic. The anemic group was further divided in two groups on the basis of % hemoglobin (Hb), mild (Hb < 10 g/dL) and severe anemic group (Hb < 8 g/dL), while non-anemic as referent children (Hb > 10 g/dL). The blood samples were analysed for Pb and Fe, along with hematological parameters. The result indicated that anemic children had a higher mean values of Pb in blood than referent children with Hb > 10 g/dL. The Pb levels < 100 μg/L were detected in 40% referent children while 60% of them had > 10 μg/dL. The BPb concentration in severe anemic children (53%) was found in the range of 100-200 μg/L, whereas 47% had > 200 μg/L. The significant negative correlations of BPb level with % Hb (r = −0.514 and r = −0.685) and Fe contents (r = −0.522, r = −0.762, p < 0.001) were observed in mild and severe anemic children respectively. While positive correlation was observed between BPb and age of both group and genders (r = 0.69, p < 0.01). The BPb levels were significantly associated with biochemical indices in the blood which have the potential to be used as biomarkers of Pb intoxication and Fe deficient anemia.  相似文献   
67.
68.
We report the synthesis of pure and Mn doped ZnO in the form of nanosheets using a simple and single step procedure involving a microwave assisted chemical method. As prepared Mn-doped ZnO nanosheets were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), ultra violet-visible (UV-Vis), Raman spectroscopy and magnetization measurements. The structural studies using XRD and TEM revealed the absence of Mn-related secondary phases and showed that Mn-doped ZnO comprise a single phase nature with wurtzite structure. FESEM and TEM micrographs show that the average diameter of Mn-ZnO assembled nanosheets is about approximately 50 nm, and the length of a Mn-doped ZnO nanosheet building block which is made up of thin mutilayered sheets is around approximately 300 nm. Concerning the Raman scattering spectra, the shift in peak position of E2 (high) mode toward low frequencies due to the Mn doping could be explained well by means of the spatial correlation model. Magnetic measurements showed that Mn-doped ZnO nanosheets exhibit ferromagnetic ordering at or above room temperature.  相似文献   
69.
We report structural and magnetic properties of Mn doped CeO2 nanoparticles using X-ray diffraction (XRD), field emission transmission electron microscopy (FE-TEM) and dc magnetization measurements. XRD results infer that all the samples have single phase nature and lattice parameters decrease with Mn doping. The particle size calculated using XRD and TEM analysis was found to decrease with Mn doping. Field cooled magnetization measurement shows that the transition temperature is above room temperature. Magnetic hysteresis loop studies indicate that undoped and Mn doped CeO2 nanoparticles show weak ferromagnetic behavior at room temperature.  相似文献   
70.
The rapid increase and complication of threats on organizations' assets makes developing organizational security policies a pressing need. Organizations should develop policies that regulate and control the access of their assets. Security policies define the guidelines that can be used to determine the security measures to be employed in an organization to keep assets secured. Security officers used to write policies in their natural language, resulting in less readable, less maintainable, and ambiguous policy statements. Consequently, the possibility of developing automation systems for policy management was very low. With the increase of business, organizations developed several security policies to control different assets, systems, and data. These policies are often scattered over different environments and different models. That makes them difficult to be tracked for implementation and updates.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号