全文获取类型
收费全文 | 659篇 |
免费 | 39篇 |
国内免费 | 1篇 |
学科分类
工业技术 | 699篇 |
出版年
2023年 | 17篇 |
2022年 | 17篇 |
2021年 | 36篇 |
2020年 | 17篇 |
2019年 | 13篇 |
2018年 | 24篇 |
2017年 | 23篇 |
2016年 | 25篇 |
2015年 | 26篇 |
2014年 | 27篇 |
2013年 | 34篇 |
2012年 | 41篇 |
2011年 | 40篇 |
2010年 | 19篇 |
2009年 | 25篇 |
2008年 | 17篇 |
2007年 | 23篇 |
2006年 | 22篇 |
2005年 | 16篇 |
2004年 | 21篇 |
2003年 | 5篇 |
2002年 | 17篇 |
2001年 | 7篇 |
2000年 | 16篇 |
1999年 | 9篇 |
1998年 | 44篇 |
1997年 | 30篇 |
1996年 | 17篇 |
1995年 | 16篇 |
1994年 | 7篇 |
1993年 | 6篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1989年 | 1篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1977年 | 3篇 |
1976年 | 10篇 |
1975年 | 4篇 |
1974年 | 1篇 |
1965年 | 2篇 |
排序方式: 共有699条查询结果,搜索用时 15 毫秒
1.
2.
3.
T Saito S Kurumada Y Kawakami H Go T Uchiyama K Ueki 《Canadian Metallurgical Quarterly》1996,56(2):105-106
A modified surgical splint for Le Fort I osteotomies with transverse expansion is presented. The splint is made of a transpalatal stainless steel bar with acrylic abutment against the palatal surface of the molar and bicuspid tooth. It is rigid and renders excellent retention. It causes minimal patient discomfort, and oral hygiene is hardly compromised. 相似文献
4.
Verrucous carcinoma is a variant of squamous cell carcinoma and should be distinguished from benign papilloma and well-differentiated nonverrucous squamous cell carcinoma. It is rare tumor of the sinonasal tract. Occasionally, conventional squamous cell carcinomatous components may be seen in verrucous carcinoma. This entity is called a hybrid verrucous squamous cell carcinoma. We report a case of hybrid verrucous squamous cell carcinoma occurring in the nasal cavity and paranasal sinus of a 67-year-old male. The removed mass shows the typical feature of verrucous carcinoma, but focally conventional squamous cell carcinomatous area is also noted. The treatment of this case follows verrucous carcinoma, but close follow up is mandatory because it may potentially spread to regional lymph nodes in contrast to pure form of verrucous carcinoma. 相似文献
5.
6.
Przemysław Gołębiewski Helena Węglarz Magdalena Nakielska Anna Wajler 《International Journal of Applied Ceramic Technology》2021,18(3):697-704
In this work, we investigated the effects of Ca2+ and Mg2+ ions and annealing temperature on the spectroscopic parameters of chromium-doped yttrium aluminum garnet ceramics (Cr:YAG). Samples were obtained with either a separate or a simultaneous addition of calcium and magnesium oxides. To achieve this, aqueous suspensions were prepared using Y2O3, Al2O3, Cr2O3, MgO, and CaO high-purity powders as raw materials. The obtained suspensions were freeze-granulated, pressed into pellets, debinded, and subjected to reactive sintering in vacuum at 1715°C for 6 h. Each material was annealed in air with temperatures between 1300 and 1700°C. Samples were also compared to Cr:YAG ceramics with the addition of silica as a sintering aid. All the materials obtained were then exposed to 445 nm excitation, and emission spectra in the visible and infrared wavelengths were recorded. The results showed that the emission spectra of Cr:YAG ceramics varied according to the annealing conditions: as-sintered samples exhibited strong emissions of around 680 nm and, after air annealing, of around 1400 nm. This phenomenon is attributed to the Cr3+→Cr4+ transition. Samples doped solely with MgO exhibited the highest emission intensity in the infrared region. Thus, Mg2+ ions provided the best conversion efficiency of chromium ions. 相似文献
7.
Go Kobayashi Hiroki Hatakeyama Kosuke Ota Yohei Nakada Takashi Kaburagi Takashi Matsumoto 《Multimedia Tools and Applications》2016,75(6):3081-3119
We attempted to predict activity/dominance for soccer games, where activity is defined as the degree of activity of the game as perceived by the viewer, whereas dominance is the degree at which the viewer perceives a particular team to dominate over the other team. Such activity/dominance information would help a layman viewer understand the game. It would also enable construction of an automatic digest creation system that extracts scenes having high activity/dominance. There are two facets of this study: 1. The main part of the underlying prediction model consists of a Stick-Breaking Hidden Markov Model, where the data automatically estimates the number of states of the Markov process behind the data. 2. The data used in this paper is vector time-series data consisting of player, referee, and ball positions, together with team information, acquired by a set of fixed cameras. The problem was approached with a Bayesian framework where learning and prediction were implemented by three different methods: Markov Chain Monte Carlo, Expectation Maximization, and Variational Bayes. The proposed method was tested using a dataset consisting of 10 professional soccer games and was compared against standard regression methods. 相似文献
8.
We perform Raman amplification in a high-pressure methane cell seeded by a low-threshold liquid Raman oscillator. The Raman frequency of the oscillator medium, dimethyl sulfoxide (DMSO), is tuned when it is mixed with water to fit the Raman frequency of methane. The Raman gain in this configuration is not so sensitive to the methane pressure, and the conversion efficiency is high. Using this configuration, we measure the polarization dependence of the Raman amplifier. An experiment is performed for three typical polarization states. Complete gain suppression is expected in some polarization states, but there is a little gain because of the incompleteness of the polarization state. Theoretically the results are analyzed when the x and the y components of the scattered waves are coupled. 相似文献
9.
DG Go?ia D Apostol M Ardelean M Trandafir C Botez 《Canadian Metallurgical Quarterly》1996,100(1-2):107-111
There been studied 100 cases of fractures of the middle third of both bones of forearm in child for to assess the correctitude of the therapy, based on the analysis of results. The most correct surgical techniques consist of osteosynthesis with Kirschner wire of the both bones, knowing the particularities of the fracture linea in child and the minimal tissues' damages. In the child younger then 10 years old, the open reduction is rarely necessary. Any displaced fracture of middle third of both bones of forearm, whatever the age of the child would be orthopedically reduced, before performing the surgical therapy. The unstable osteosynthesis such as simple screw "osteosynthesis" with wire or thread are contraindicated. 相似文献
10.
El-Bassel Nabila; Gilbert Louisa; Frye Victoria; Wu Elwin; Go Hyun; Hill Jennifer; Richman Beverly L. 《Canadian Metallurgical Quarterly》2004,18(2):180
Although several studies have examined the relationship between intimate partner violence (IPV) and drug use among women in drug treatment programs, more information is needed to delineate differences, as a function of the specific drug used. Data from a random sample of 416 women attending methadone programs were analyzed to elucidate the differential associations between IPV and use of the following: marijuana only, cocaine only, heroin only, or cocaine and heroin. Prevalence of IPV among this sample far exceeded estimates from the general population. After adjusting for sociodemographic variables, use of cocaine only was significantly associated with an increased likelihood of experiencing IPV compared with no drug use. Similar results were found for women using both cocaine and heroin. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献