全文获取类型
收费全文 | 54939篇 |
免费 | 6600篇 |
国内免费 | 3847篇 |
专业分类
电工技术 | 5065篇 |
技术理论 | 3篇 |
综合类 | 5120篇 |
化学工业 | 10538篇 |
金属工艺 | 2352篇 |
机械仪表 | 4237篇 |
建筑科学 | 3132篇 |
矿业工程 | 2192篇 |
能源动力 | 5170篇 |
轻工业 | 1230篇 |
水利工程 | 5239篇 |
石油天然气 | 4890篇 |
武器工业 | 610篇 |
无线电 | 1750篇 |
一般工业技术 | 4402篇 |
冶金工业 | 2915篇 |
原子能技术 | 1369篇 |
自动化技术 | 5172篇 |
出版年
2024年 | 106篇 |
2023年 | 789篇 |
2022年 | 1465篇 |
2021年 | 1767篇 |
2020年 | 1895篇 |
2019年 | 1624篇 |
2018年 | 1504篇 |
2017年 | 1912篇 |
2016年 | 2183篇 |
2015年 | 2205篇 |
2014年 | 3098篇 |
2013年 | 3668篇 |
2012年 | 3734篇 |
2011年 | 4342篇 |
2010年 | 2984篇 |
2009年 | 3261篇 |
2008年 | 3020篇 |
2007年 | 3581篇 |
2006年 | 3412篇 |
2005年 | 3056篇 |
2004年 | 2528篇 |
2003年 | 2242篇 |
2002年 | 1827篇 |
2001年 | 1544篇 |
2000年 | 1278篇 |
1999年 | 1068篇 |
1998年 | 888篇 |
1997年 | 751篇 |
1996年 | 695篇 |
1995年 | 639篇 |
1994年 | 515篇 |
1993年 | 402篇 |
1992年 | 337篇 |
1991年 | 205篇 |
1990年 | 218篇 |
1989年 | 161篇 |
1988年 | 116篇 |
1987年 | 90篇 |
1986年 | 60篇 |
1985年 | 29篇 |
1984年 | 44篇 |
1983年 | 35篇 |
1982年 | 18篇 |
1981年 | 8篇 |
1980年 | 8篇 |
1979年 | 15篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1959年 | 21篇 |
1951年 | 23篇 |
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
101.
Mg(OH)2浆液是一种具备低再生能耗潜力的CO2吸收剂,为了推进其在CO2捕集领域的应用而展开研究。在填料塔中,使用真实烟气研究了各种操作条件下Mg(OH)2浆液对CO2的捕集效率。研究发现,填料种类、气体名义停留时间、液气比均对CO2捕集效率有影响。结果表明,增加气体名义停留时间无法有效改善液相传质,而提高液气比能够有效改善液相传质;在试验条件下,拉西环、鲍尔环和IMTP的总体积传质系数分别为8.5×10-7~5.0×10-6、1.8×10-6~4.0×10-6和1.9×10-7~2.9×10-6 mol/(m3·s·Pa)。 相似文献
102.
103.
Cristina S. Borba Joo D. Latini Matheus T. Baumgartner Luiz C. Gomes Angelo A. Agostinho 《河流研究与利用》2019,35(4):386-395
The building of adduction channels (penstocks) that conduct water from reservoirs to turbines, which are located kilometres from the dam, is becoming common, optimizing the electricity generation in small dams. This design creates a river stretch with reduced discharge between the dam and the powerhouse. This study evaluates the short‐term impacts of the below‐dam decrease in river flow on fish assemblages. Samples were collected in the reduced flow stretch of the Castro Alves Hydropower Plant (Antas River, Rio Grande do Sul, Brazil) before the reservoir started operating (January 2008; mean discharge of 103.7 m3/s) and immediately after operation began (March 2008; mean discharge of 12.4 m3/s). Sampling was conducted in distinct habitats of the reduced flow stretch (slow waters—gillnets, sand beaches—seining nets, structured littoral—electrofishing, and fast waters—cast nets) with a strongly standardized effort. The attributes of the fish assemblages were not negatively affected by the flow reduction in any habitat sampled. However, distinct changes in the spatial structure were observed considering the different types of habitat predominantly used by the species, which represents an entire reorganization of the fish assemblages in the short term. It is fundamental that these short‐term aspects be considered in the licensing of hydropower plants in addition to the long‐term changes. 相似文献
104.
《International Journal of Hydrogen Energy》2019,44(30):15746-15757
Providing heat for supercritical water gasification (SCWG) of coal by coupling subsequent products oxidation in integrated supercritical water reactor (ISWR) provides an effective method for directional control of temperature field and avoids excessive hot spots caused by uniform heating. An exploratory numerical model incorporating particle-fluid flow dynamics, multispecies transport and thermal coupling between endothermic coal gasification and exothermic product oxidation was established to simulate the reacting multiphase flow process of coal conversion in a novel lab-scale ISWR. An eleven-lump kinetic model was proposed for the prediction of chemical reactions. And the thermal coupling relationship was described by conjugate heat transfer boundary conditions (BC). Detailed physical and chemical field distribution in ISWR were analyzed and influence factors were discussed. The results showed that oxidation of gas products as inner heat source could promote the gasification reaction with only slight or even little maximum temperature increase of the pressure-bearing wall. Coal feeding rate and oxygen supply method significantly affected the field distribution. The multi-injection compressed-air supply method provided a more uniform temperature field but would reduce heat transfer temperature difference. The carbon gasification efficiency (CGE) in the gasification zone could easily reach up to 97% under mild conditions (less than 650 °C). 相似文献
105.
大直径厚壁气瓶内部淬火时的流动换热过程极其复杂,受到多种因素的影响,而研究气瓶内部压强和温度的变化规律对改善流动换热效果、提高产品组织性能具有重要的理论指导意义。以914 mm厚壁气瓶和瓶内流体为研究对象,建立了二维等效流 固耦合模型;采用多喷嘴系统对气瓶内外进行喷水淬火,研究了气瓶总长、喷水流速及淬火时间对瓶内压强及内壁温度的影响,通过间歇淬火试验验证了数学模型的正确性。结果发现,气瓶长度对瓶内压强和瓶壁温度的影响显著,喷水流速次之,当喷水流速大于8 m/s后,水量对瓶壁的冷却效果大大降低;气瓶内壁长度方向的温度梯度分别随气瓶总长的增加和淬火时间的延长而减小,但基本不受喷水量的影响。 相似文献
106.
The minimum cost flow problem (MCFP) is the most generic variation of the network flow problem which aims to transfer a commodity throughout the network to satisfy demands. The problem size (in terms of the number of nodes and arcs) and the shape of the cost function are the most critical factors when considering MCFPs. Existing mathematical programming techniques often assume the cost functions to be linear or convex. Unfortunately, the linearity and convexity assumptions are too restrictive for modelling many real-world scenarios. In addition, many real-world MCFPs are large-scale, with networks having a large number of nodes and arcs. In this paper, we propose a probabilistic tree-based genetic algorithm (PTbGA) for solving large-scale minimum cost integer flow problems with nonlinear non-convex cost functions. We first compare this probabilistic tree-based representation scheme with the priority-based representation scheme, which is the most commonly-used representation for solving MCFPs. We then compare the performance of PTbGA with that of the priority-based genetic algorithm (PrGA), and two state-of-the-art mathematical solvers on a set of MCFP instances. Our experimental results demonstrate the superiority and efficiency of PTbGA in dealing with large-sized MCFPs, as compared to the PrGA method and the mathematical solvers. 相似文献
107.
为提高Al-12Si合金的热变形抗力,并探索非晶Fe粉掺杂对Al-12Si合金热压缩行为的影响和掺杂非晶Fe粉热压缩中的晶化温度等,采用连续挤压技术制备了掺杂10wt%非晶Fe粉与不掺杂非晶Fe粉的Al-12Si合金试样,对试样进行了不同温度和应变速率下的热压缩试验,分析了试样在热压缩中的组织转变,以及采用双曲正弦关系构建了试样的热流变应力方程。结果表明:非晶Fe掺杂试样在450 ℃及以下的热压缩时,Fe维持非晶态,500 ℃时,则已发生晶化;掺杂10wt%非晶Fe粉使Al-12Si合金的热抗变形能力显著提高,其热压缩激活能Q=211.29 kJ/mol,比未掺杂非晶Fe粉的Al-12Si合金试样高40.78 kJ/mol,且热压缩过程中存在动态回复和动态再结晶;利用双曲正弦关系构建试样的热流变应力方程为ε·=4.42×1014[sinh(0.016 6σ)]6.13exp(-211 290/RT),线性回归系数高达0.99,即可为非晶Fe粉掺杂试样的热加工提供一定的理论指导。 相似文献
108.
Commonly used flow rate measurement systems provide an accurate and stable output value of the quasi-stationary flow rate. In some pump types as e.g. single-blade pumps significant flow rate fluctuations may occur even in steady operation points due to rotor-stator interaction. For the analysis of the time-resolved flow rate a new measurement and evaluation method is presented based on an electromagnetic flow meter. Internal averaging of the flow meter is deactivated and the raw signal is evaluated directly with a sampling rate of 3 kHz. With ensemble-averaging in combination with an impeller position detection, interfering signals acting on the time-resolved measurement signal are filtered out. Accompanying numerical simulations of the pump flow circuit are carried out with a 1D method of characteristics and validated against well-established time-resolved pressure measurements of the pump flow. Experiment and simulation show a resembling trend of pressure as well as flow rate fluctuations over the entire operation range of the pump. Thus, by the combined utilisation of measurement and simulation technique, we assure the validity of the ensemble-averaged flow rate fluctuation results. We find that the flow rate fluctuations show a consistent phase shift to the pressure fluctuations that increases towards overload. The flow rate amplitude is an order of magnitude smaller than the amplitude of the pressure fluctuations. 相似文献
109.
为研究机械密封腔内混有固体颗粒的流体,在复杂工况下对密封腔壁面及波纹管表面冲蚀的影响,以CFD理论及方法,采用k-ε湍流模型和离散项DPM模型,对固液混合流场进行模拟分析,获得密封腔内流体中介质作用下密封腔壁面及波纹管外表面的压力场分布,分析不同工作状态下固体颗粒作用下密封腔内壁和波纹管外表面的冲蚀区域分布、固体颗粒在流场中的运动轨迹,以及机械密封工作过程中流场内固体颗粒的逃逸量、运动状态的变化。结果表明:粒子主要受颗粒阻力、浮重力、压力梯度力及波纹管和密封腔表面反作用力的影响;在旋转流场中,粒子作与旋转方向一致的螺旋方式前进;无转速时,冲蚀多发生在靠近入口处的波纹管外表面,旋转流场中,冲蚀多发生在密封腔靠后位置的壁面;随着转速增加,粒子逃逸率下降。研究结论为机械密封腔的设计布局及机械密封装置的优化提供理论依据。 相似文献
110.