全文获取类型
收费全文 | 36428篇 |
免费 | 3092篇 |
国内免费 | 1377篇 |
专业分类
电工技术 | 3484篇 |
综合类 | 3064篇 |
化学工业 | 4583篇 |
金属工艺 | 1006篇 |
机械仪表 | 2209篇 |
建筑科学 | 6213篇 |
矿业工程 | 1595篇 |
能源动力 | 3016篇 |
轻工业 | 1802篇 |
水利工程 | 971篇 |
石油天然气 | 1561篇 |
武器工业 | 622篇 |
无线电 | 1941篇 |
一般工业技术 | 4480篇 |
冶金工业 | 1669篇 |
原子能技术 | 352篇 |
自动化技术 | 2329篇 |
出版年
2024年 | 138篇 |
2023年 | 395篇 |
2022年 | 782篇 |
2021年 | 1015篇 |
2020年 | 1093篇 |
2019年 | 778篇 |
2018年 | 727篇 |
2017年 | 1060篇 |
2016年 | 1027篇 |
2015年 | 1098篇 |
2014年 | 2214篇 |
2013年 | 2187篇 |
2012年 | 2577篇 |
2011年 | 2771篇 |
2010年 | 2091篇 |
2009年 | 2141篇 |
2008年 | 1905篇 |
2007年 | 2485篇 |
2006年 | 2388篇 |
2005年 | 2060篇 |
2004年 | 1787篇 |
2003年 | 1555篇 |
2002年 | 1357篇 |
2001年 | 1007篇 |
2000年 | 882篇 |
1999年 | 671篇 |
1998年 | 531篇 |
1997年 | 427篇 |
1996年 | 317篇 |
1995年 | 311篇 |
1994年 | 235篇 |
1993年 | 176篇 |
1992年 | 138篇 |
1991年 | 115篇 |
1990年 | 82篇 |
1989年 | 74篇 |
1988年 | 58篇 |
1987年 | 42篇 |
1986年 | 27篇 |
1985年 | 26篇 |
1984年 | 37篇 |
1983年 | 33篇 |
1982年 | 25篇 |
1981年 | 10篇 |
1980年 | 11篇 |
1979年 | 8篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1959年 | 3篇 |
1954年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
《International Journal of Hydrogen Energy》2022,47(94):40099-40115
In order to reveal the mechanism of water fog explosion suppression and research the combined effect of water fog and obstacle on hydrogen/air deflagration, multiple sets of experiments were set up. The results show that the instability of thermal diffusion under lean combustion conditions is the main influencing factor of hydrogen/air flame surface instability, and the existence of water fog will aggravate the hydrogen/air flame surface instability. When obstacle is not considered, 8 μm, 15 μm, 30 μm water fog can significantly reduce the flame velocity and explosion overpressure of hydrogen/air, 45 μm fine water fog plays the opposite role. When considering the relative position of the water fog release position and the obstacle, the 8 μm, 15 μm, 30 μm water fog has almost no suppression effect when released near the obstacle, but a significant suppression effect occur, when using the 45 μm water fog. In the field of theoretical research, the research results not only provide an experimental basis for the fine water fog to reduce the consequences of hydrogen explosion accidents, and the optimal diameter range used by the water fog, but also provide experimental reference for the numerical simulation of hydrogen/air explosion suppression in semi-open space, and promote the development of hydrogen explosion suppression theory. In terms of engineering applications, this study can provide a theoretical basis for the layout of fire fighting equipment in the engine room of nuclear power plants or hydrogen-powered ships. 相似文献
2.
《International Journal of Hydrogen Energy》2022,47(9):6377-6387
This work is focused on the explosion characteristics of premixed gas containing different volume fractions of hydrogen in a narrow channel (1000 mm × 50 mm × 10 mm) under the circumstance of stoichiometric ratio. The ignition positions were set in the closed end and the middle of the pipeline respectively. The results showed that when the gas was ignited at the pipeline closed end, the propagating flame was tulip structure for different premixed gas. When the hydrogen volume fraction was less than 40%, the flame propagation speed increased significantly with the rise of hydrogen volume fraction, and the overpressure peak also appeared obviously in advance. However, when the volume fraction of hydrogen was more than 40%, the increase of flame propagation speed and the overpressure peak occurrence time varied slightly. Furthermore, when the ignition position was placed in the middle of the pipeline, the flame propagation speed propagating to the opening end was much faster than that propagating to the closing end, and there was no tulip shape when the flame propagates to the opening end. The flame propagating to the closed end appeared tulip shape under the influence of airflow, and high-frequency flame oscillation occurred during the propagation. This work shows that the hydrogen volume fraction and ignition position significantly affected the flame structure, flame front speed, and explosion overpressure. 相似文献
3.
4.
目的:探索炎性疾病患者的乳酸林格氏液(Ringer's lactate,RL)液体动力学特征以及炎性生物标记物是否可以作为协变量影响RL分布和排泄。方法:本研究为前瞻性队列研究。选择40例美国麻醉医师分级(ASA)I-II级,腹腔镜下择期胆囊切除术(胆囊炎组,n=20)或者腹腔镜下急诊阑尾切除术(阑尾炎组,n=20)。所有患者麻醉诱导前开始输注RL,按15 mL/kg,35 min内输毕。采用酶联免疫(enzyme-linked immunosorbent assay,ELISA)方法测定血浆炎症(TNF-α,IL-10和CRP)或者内皮损伤生物标记物(syndecan-1,SDC-1);利用血红蛋白(Hb)稀释-时间曲线和尿量,使用Phoenix软件,采用非线性混合效应模型分析计算RL液体动力学参数和协变量的影响。结果:与胆囊炎组相比,阑尾炎组RL从组织间隙到血浆的转运速率常数(k21)显著降低(14×10-3min-1 versus 35×10-3min-1;P=0.012)。阑尾炎组C反应蛋白(CRP)升高[中位数38.1(1.8-143.6) μg/mL versus 1.3(0.1-159.0) μg/mL;P<0.001];与清醒状态相比,麻醉期间(输液开始后30~45 min),液体从中央室中到外周室的转运速率常数(k12)显著增加(57×10-3min-1 versus 32×10-3min-1;P<0.01)。清除速率常数(k10)降低90%(0.6×10-3min-1 versus 5.3×10-3min-1;P<0.001)。无论在清醒状态还是麻醉状态下低血压均能降低液体清除;炎症或者内膜损伤的生物标记物不能作为显著影响RL液体动力学参数的协变量。结论:阑尾炎或者胆囊炎患者术前输入液体后“炎症反应的生物标记物”不是RL的液体动力学的协变量,但是两组患者中,全身麻醉期间输入液体的清除率下降。 相似文献
5.
大型综合室内亲子乐园属于高大空间,设有游乐设施和游戏的特殊性使得对空间的舒适性要求一致,但是送风气流遇阻严重,室内存在较多气流死角,影响室内空气质量和儿童健康。因此其空调设计不仅需要考虑温度、风速的空间均匀度,还要考虑各点的空气龄和PMV-PPD指标。以天津某亲子乐园为研究对象,利用scSTREAM软件对适用于该房间的辐射供冷加新风、置换通风、混合通风三种空调方式的送风效果进行数值模拟分析,从流场的均匀性、人员的热舒适性等方面对模拟结果进行探讨,研究结果表明辐射供冷加新风方式的空间均匀性和PMV指标最佳,混合通风方式的空气龄最小。 相似文献
6.
《低温学》2015
The development of a high cooling power and high efficiency 4.2 K two stage G-M cryocooler is critically important given its broad applications in low temperature superconductors, MRI, infrared detector and cryogenic electronics. A high efficiency 1.5 W/4.2 K pneumatic-drive G-M cryocooler has recently been designed and developed by ARS. The effect of expansion volume rate and operation conditions on the cooling performance has been experimentally investigated. A typical cooling performance of 1.5 W/4.2 K has been achieved, and the minimum temperature of the second stage is 2.46 K. The steady input power of the compressor at 60 Hz is 6.8 kW, while the operation speed of the rotary valve is 30 rpm. A maximum cooling power of 1.75 W/4.2 K has been obtained in test runs. 相似文献
7.
High-efficiency filtration in residential forced-air heating, ventilation, and air conditioning (HVAC) systems protects equipment and can reduce exposure to particulate matter. Laboratory tests provide a measure of the nominal efficiency, but they may not accurately reflect the in situ efficiency of the filters because of variations in system conditions and changes in filter performance over time. The primary focus of this paper is to evaluate the effective filtration efficiency, which is inclusive of any loading and system impacts, in 21 occupied residential homes through in-duct concentration measurements. We considered the role of filter media by testing both electret and non-electret media, as well as the role of loading by considering new and used filters. The results show that filters with higher nominal efficiency generally had higher effective filtration efficiency in the same home. In terms of performance change, there is no significant difference in efficiency between initial and 3-month non-electret filters, but the efficiency of electret filters generally decreased over time. However, both nominal efficiency and performance change were vastly overshadowed by the wide variety in loading and system conditions across homes, making it hard to predict filter efficiency in a given home without in situ measurements. 相似文献
8.
In this paper, the dynamic behaviors on the basis of simulation for high-purity heat integrated air separation column (HIASC) are studied. A nonlinear generic model control (GMC) scheme is proposed based on the nonlinear behavior analyses of a HIASC process, and an adaptive generic model control (AGMC) scheme is further presented to correct the model parameters online. Related internal model control (IMC) scheme and multi-loop PID (M-PID) scheme are also developed as the comparative base. The comparative researches are carried out among these linear and nonlinear control schemes in detail. The simulation research results show that the proposed AGMC schemes present advantages in both servo control and regulatory control for the high-purity HIASC. 相似文献
9.
大气污染物排放清单是空气质量模拟和空气污染治理的重要依据.本研究比较分析了两套覆盖江苏省的2017年大气污染物排放清单,即分别由上海市环境科学研究院、江苏省环境科学研究院编制的"长三角清单"和"江苏省清单",并结合区域空气质量模型CMAQ评估不同清单对长三角地区2017年1、4、7、10月的空气质量模拟的影响.清单比较结果表明,除二氧化硫(SO2)以外,江苏省清单估算的各污染物排放量较长三角清单低.通过与观测数据比较,发现两套清单对SO2、氮氧化物(NOx)、臭氧(O3)和细颗粒物(PM2.5)的模型模拟性能均较好.江苏省清单与长三角清单两者的模拟结果空间分布接近,其中江苏省清单模拟的PM2.5和O3在长三角多数地区略低于长三角清单的模拟结果(1月O3除外).江苏省清单与长三角清单均能够用于空气质量模式模拟,可为江苏地区的细颗粒物和光化学烟雾污染的控制策略制定提供参考. 相似文献
10.
Angelico Mendy Nervana Metwali Sarah S. Perry Elizabeth A. Chrischilles Kai Wang Peter S. Thorne 《Indoor air》2020,30(1):88-97
Endotoxin exacerbates asthma. We designed the Louisa Environmental Intervention Project (LEIP) and assessed its effectiveness in reducing household endotoxin and improving asthma symptoms in rural Iowa children. Asthmatic school children (N = 104 from 89 homes) of Louisa and Keokuk counties in Iowa (aged 5-14 years) were recruited and block-randomized to receive extensive (education + professional cleaning) or educational interventions. Environmental sampling collection and respiratory survey administration were done at baseline and during three follow-up visits. Mixed-model analyses were used to assess the effect of the intervention on endotoxin levels and asthma symptoms in the main analysis and of endotoxin reduction on asthma symptoms in exploratory analysis. In the extensive intervention group, dust endotoxin load was significantly reduced in post-intervention visits. The extensive compared with the educational intervention was associated with significantly decreased dust endotoxin load in farm homes and less frequent nighttime asthma symptoms. In exploratory analysis, dust endotoxin load reduction from baseline was associated with lower total asthma symptoms score (Odds ratio: 0.52, 95% confidence interval: 0.29-0.92). In conclusion, the LEIP intervention reduced household dust endotoxin and improved asthma symptoms. However, endotoxin reductions were not sustained post-intervention by residents. 相似文献