全文获取类型
收费全文 | 754篇 |
免费 | 4篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 25篇 |
综合类 | 31篇 |
化学工业 | 179篇 |
金属工艺 | 9篇 |
机械仪表 | 22篇 |
建筑科学 | 205篇 |
矿业工程 | 16篇 |
能源动力 | 82篇 |
轻工业 | 7篇 |
水利工程 | 27篇 |
石油天然气 | 19篇 |
武器工业 | 1篇 |
无线电 | 6篇 |
一般工业技术 | 29篇 |
冶金工业 | 38篇 |
原子能技术 | 4篇 |
自动化技术 | 61篇 |
出版年
2023年 | 4篇 |
2022年 | 8篇 |
2021年 | 10篇 |
2020年 | 15篇 |
2019年 | 14篇 |
2018年 | 7篇 |
2017年 | 11篇 |
2016年 | 9篇 |
2015年 | 15篇 |
2014年 | 34篇 |
2013年 | 59篇 |
2012年 | 54篇 |
2011年 | 56篇 |
2010年 | 48篇 |
2009年 | 60篇 |
2008年 | 34篇 |
2007年 | 56篇 |
2006年 | 51篇 |
2005年 | 46篇 |
2004年 | 34篇 |
2003年 | 39篇 |
2002年 | 20篇 |
2001年 | 11篇 |
2000年 | 9篇 |
1999年 | 6篇 |
1998年 | 7篇 |
1997年 | 10篇 |
1996年 | 9篇 |
1995年 | 7篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有761条查询结果,搜索用时 15 毫秒
1.
Jean-Fran?ois Blais Nathalie Meunier Guy Mercier Patrick Drogui Rajeshwar Dayal Tyagi 《Canadian Metallurgical Quarterly》2004,130(5):516-525
This research is related to a preindustrial pilot scale study of the performance of the simultaneous sewage sludge digestion and metal leaching (SSDML) process for decontamination and stabilization of sewage sludge. Ten batch tests were carried out in two 4?m3 bioreactors under various conditions of operation. Results indicated that the addition of 1.0 to 1.5?g?S0/L, which is the equivalent of approximately 30 to 50?kg?S0 per tons dry sludge, is sufficient to obtain conditions of acidity (pH<2.5) and oxido-reduction potential greater than 500 mV necessary for an effective solubilization of toxic metals. The final average of metal solubilization in the output sludge during the SSDML process varied in the following ranges: 25–78% Cd, 9–32% Cr, 48–100% Cu, 77–99% Mn, 15–53% Ni, 12–47% Pb, and 66–100% Zn. The N, P, and K contents were also preserved in the decontaminated sludge. Moreover, the use of low concentrations of elemental sulfur makes it possible to obtain decontaminated sludge with a low total sulfur content (1.4–1.5% S) compatible with agricultural use. The suspended solids removal calculated for the SSDML process was slightly lower, (2.5±0.4)% volatile suspended solids per day, than those reached using standard aerobic digestion. Finally, the SSDML process was found to be effective in removing bad odors and in the destruction (99–100%) of indicator bacteria. 相似文献
2.
威海市污水处理深海排放工程是为改善其水域环境而建设的一英包括市区排水系统,污水预处理厂,输水管道和海洋放流管系统在内的完整而典型的工程,因此其工程设计扣的经验将会对同类项目的设计与工程建设有所借鉴。 相似文献
3.
文章主要讨论了LonWorks现场总线技术在城市污水处理厂和气象指数预报中的应用。采用IPC和PLC控制结构对现场的各种设备实现控制和数据的采集,通过现场总线网络传输数据到中心控制室或远程终端,实现污水处理的自动控制和气象信息的实时采集和处理。 相似文献
4.
Off-Site Exposure to Respirable Aerosols Produced during the Disk-Incorporation of Class B Biosolids
Swee Yang Low Tania Paez-Rubio Carolina Baertsch Matthew Kucharski Jordan Peccia 《Canadian Metallurgical Quarterly》2007,133(10):987-994
Field experiments were conducted at a Class B biosolids land application site in central Arizona to measure, model, and source-track the off-site transport of aerosols emitted when biosolids were disk-incorporated into soils. Real-time PM10 monitoring provided time-resolved aerosol information sufficient for verifying both off-site concentration and off-site exposure time model results. Under the conditions considered and at a distance of 165?m from the aerosol source, biosolids disk-incorporation resulted in an intermittent exposure to biosolids-derived aerosol concentration between 15 and 40?μg/m3 and an inhalable biosolids dose between 2 and 8?μg. Transport modeling predicted that these doses will decrease with increasing wind speed. In addition, three DNA sequence-based biosolids source tracking methods were applied to aerosol samples and confirmed the presence of biosolids in aerosols at 5, 65, and 165?m from the aerosol source. Field measurements and modeling indicate that the nature of biosolids-derived aerosol exposure is a series of intermittent high concentration puffs, rather than a continuous low concentration. 相似文献
5.
关于SBR工艺的书籍和文章很多。本文在这些资料的基础上整理总结 ,对经典SBR工艺的应用进行了综述 ,归纳了经典SBR工艺的特点 ,介绍了各种新型SBR工艺。 相似文献
6.
指出施工监理是一项细致而又责任重大的工作。把握好污水处理厂关键工序的施工及检查,才能对污水处理工程进行有效地控制和管理,使之发挥最大的经济和社会效益。 相似文献
7.
Optimal control (OC) methodology is used to develop a control policy for a batch-operated solar sludge dryer with ventilation as the dominant control. Batch performance criteria and instantaneous optimization criteria are developed for two economic environments: quota limited and capital limited. The general formulation, as well as simplifications resulting from the multiplicative form of the evaporation (drying) rate model, are presented. The multiplicative form results in a single constant number, called here “control intensity,” which is used to guide the on-line control decisions. These decisions turn out to be independent of the dry solids content (DSC) of the sludge. Further simplification, by assuming a strictly constant weather, is used to demonstrate the general effects of the economic and physical (weather) environment on the solution.
The OC approach is used to address, via simulation under realistic weather conditions, several design, operation, and pricing problems. In particular, the following have been considered: sizing of the ventilation fans, determination of a fair fee for sludge disposal, finding the best final DSC, and evaluating the effect of the price of electricity. Regarding the particular location represented by the data, it has been shown that the installed capacity of the ventilation fans should be increased and that there seems to be sufficient economic incentive for solar drying. 相似文献
The OC approach is used to address, via simulation under realistic weather conditions, several design, operation, and pricing problems. In particular, the following have been considered: sizing of the ventilation fans, determination of a fair fee for sludge disposal, finding the best final DSC, and evaluating the effect of the price of electricity. Regarding the particular location represented by the data, it has been shown that the installed capacity of the ventilation fans should be increased and that there seems to be sufficient economic incentive for solar drying. 相似文献
8.
神经网络在工业污水处理建模中的应用 总被引:1,自引:0,他引:1
研究工业污水指标在线准确检测问题,工业污水处理是一种复杂的动态生物反应工程系统,具有多变量、非线性等特点,难以建立精确的数学模型,且在线实时检测仪表价格昂贵。从应用工程角度出发,提出将遗传神经网络方法应用于污水指标实时检测,建立污水指标软测量模型。利用一些可测指标与水质指标间的关联关系,通过神经网络进行拟合,并采用遗传算法优化神经网络参数。仿真结果表明,建立的神经网络污水估计模型,可以对污水指标进行实时检测和估计,并为污水在线实时检测提供了新的思路。 相似文献
9.
介绍了一套新型造气污水处理装置,该装置具有处理工艺流程合理,设备布置紧凑,装置自动化运行的特点,造气污水经处理后重复循环使用,污泥送沸腾炉作燃料燃烧,实现了污水零排放的目的。 相似文献
10.
Jae-Keun Lee Hee-Soo Shin Chan-Jung Park Chang-Geon Lee Jung-Eun Lee Young-Whan Kim 《Korean Journal of Chemical Engineering》2002,19(1):41-45
A laboratory-scale electrodewatering system, incorporating an electric field as an additional driving force to conventional
pressure dewatering, has been developed to decrease the water content of sludges generated in wastewater treatment. Consisting
of a piston-type filter press, a power supply and a data acquisition system, the electrodewatering system’s performance was
evaluated as a function of applied pressure, applied voltage, sludge type and filtration time. Experiments were carried out
using sewage sludges with the electric field up to 120 V/cm and pressure ranging from 98.1 to 392.4 kPa. Electrodewatering
involving a combination of electric field and pressure enhances both the dewatering rate and final dewatered volume. The final
water content of sewage sludges in the electrodewatering system can be reduced to 62 wt%, as compared to 78 wt% achieved with
the pressure filtration alone. The electrodewatering system shows the potential to be an effective method for reducing the
water content in sludges. 相似文献