全文获取类型
收费全文 | 82篇 |
免费 | 12篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 3篇 |
综合类 | 8篇 |
化学工业 | 1篇 |
机械仪表 | 2篇 |
建筑科学 | 34篇 |
能源动力 | 3篇 |
水利工程 | 28篇 |
无线电 | 5篇 |
一般工业技术 | 3篇 |
冶金工业 | 2篇 |
自动化技术 | 8篇 |
出版年
2023年 | 1篇 |
2021年 | 3篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2014年 | 10篇 |
2013年 | 11篇 |
2012年 | 5篇 |
2011年 | 5篇 |
2010年 | 5篇 |
2009年 | 11篇 |
2008年 | 6篇 |
2007年 | 4篇 |
2006年 | 4篇 |
2005年 | 5篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 2篇 |
排序方式: 共有97条查询结果,搜索用时 31 毫秒
11.
12.
陈智崧 《扬州大学烹饪学报》2009,26(4):12-15
湛江地处半岛,优异的生态,孕育出优质和丰富的海鲜食材资源。湛江莱源远流长,以海鲜为主,选料新鲜、过程不腌制,遵循“本味调和”,“自然养生”的原则,吸收现代粤港菜之精细,构成湛江海鲜美食的特色。湛江菜是粤菜门下的独特菜系。 相似文献
13.
昂船洲大桥位处于香港港口一个显的位置,落成后将成香港一个主要标志。大桥的主跨为1018m,这般大跨度的斜拉桥将是一项世界纪录,亦将是斜拉桥科技上的一大突破。设计和兴建昂船洲大桥将是一项极大的挑战。对此项艰巨而且复杂的工作,引入国际性竞争机制是明智决定。本工程如按常规在本地招标设计, 相似文献
14.
潮汐汊道开发中的水环境问题 总被引:6,自引:0,他引:6
以山东半岛月湖和海南岛博鳌港为例 ,论述人类开发活动对潮汐汊道带来的生态系统问题和航运防洪问题。在山东半岛月湖 ,为海水养殖而进行的口门围封和潮间带围垦造成了涨、落潮历时和潮流流速格局的变化 ,进而引起纳潮海湾的淤塞和水体交换的滞缓 ,最终导致生态系统的恶化 ,使海水养殖业蒙受损失。在海南岛博鳌港 ,口门航道的整治问题突出 ,但如果设计不当 ,航道整治工程的实施将给港内沿岸地区带来极大的洪水风险 ,使现有开发工程的设计不能满足防洪的要求。分析表明 ,潮汐汊道开发中所产生的水环境问题的解决 ,无论是生态系统修复 ,还是海滨城市的风险与安全问题 ,都需要多学科的交叉研究。 相似文献
15.
本文通过介绍大连港地区更新改造的相关规划设计研究过程与成果,分析与其最终修订的控制性详细规划的根本差别,并结合我国规划设计实践的现状,提出相关方面的思考。 相似文献
16.
Susan D. Shaw Michelle L. Berger Kurunthachalam Kannan Olaf Päpke 《The Science of the total environment》2009,407(10):3323-3329
Seven species of teleost fishes comprising major prey of northwest Atlantic harbor seals were analyzed for polybrominated diphenyl ethers (PBDEs). PBDE concentrations in whole fish samples (n = 87) were compared with those measured previously in harbor seal blubber to evaluate the transfer of PBDEs from prey to predator. Hexabromocyclododecane (HBCD) concentrations were measured in three fish species to provide an initial estimation of HBCD contamination in this ecosystem. HBCD was detected in 87% of the fish samples at concentrations ranging from 2.4 to 38.1 ng/g, lw (overall mean 17.2 ± 10.2 ng/g, lw). ∑PBDE concentrations in fish ranged from 17.9 to 94 ng/g, lw (overall mean 62 ± 34 ng/g, lw). ∑PBDE concentrations in the harbor seals were two orders of magnitude higher than levels in the fish. Biomagnification factors (BMFs) from fish to seals averaged from 17 to 76, indicating that tetra- to hexa-BDEs are highly biomagnified in this marine food web. BDE-47 was the dominant congener in all samples, suggesting exposure to the penta-BDE mixture. The presence of higher brominated congeners including BDE-209 at measurable levels in fish and seal tissue, along with the very high biomagnification of BDE-153, as well as − 155, and − 154, suggests recent exposure to the octa- and deca-BDE formulations in this US coastal marine food web, as well as the additional contribution of BDE-209 debromination in fish to the loading of persistent PBDEs in the seals. This is the first study to report the occurrence of BDE-209 and other higher BDEs in commercially important marine fishes from the northwest Atlantic. 相似文献
17.
Gaseous and dissolved concentrations of polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB) were measured in the ambient air and water of Kaohsiung Harbor lagoon, Taiwan, from December 2003 to January 2005. During the rainy season (April to September), gaseous PCB and HCB concentrations were low due to both scavenging by precipitation and dilution by prevailing southwesterly winds blown from the atmosphere of the South China Sea. In contrast, trace precipitation and prevailing northeasterly winds during the dry season (October to March) resulted in higher gaseous PCB and HCB concentrations. Instantaneous air-water exchange fluxes of PCB homologues and HCB were calculated from 22 pairs of air and water samples from Kaohsiung Harbor lagoon. All net fluxes of PCB homologues and HCB in this study are from water to air (net volatilization). The highest net volatile flux observed was + 172 ng m− 2 day− 1 (dichlorobiphenyls) in December, 2003 due to the high wind speed and high dissolved concentration. The PCB homologues and HCB fluxes were significantly governed by dissolved concentrations in Kaohsiung Harbor lagoon. For low molecular weight PCBs (LMW PCBs), their fluxes were also significantly correlated with wind speed. The net PCB and HCB fluxes suggest that the annual sums of 69 PCBs and HCB measured in this study were mainly volatile (57.4 × 103 and 28.3 × 103 ng m− 2 yr− 1, respectively) and estimated yearly, 1.5 kg and 0.76 kg of PCBs and HCB were emitted from the harbor lagoon surface waters to the ambient atmosphere. The average tPCB flux in this study was about one-tenth of tPCB fluxes seen in New York Harbor and in the Delaware River, which are reported to be greatly impacted by PCBs. 相似文献
18.
本文介绍了在“广州港湾广场的设计中,通过从历史、未来发展及空间构成关系三方面对珠江与广州城市的关系,在遵循城市设计原则的同时,注重塑造沿珠江的亲水建筑方案。 相似文献
19.
《Baosteel Technical Research》2010,(Z1):107
Through summary and extraction of current steelmaking design,process and equipment technologies and production technologies for 300 t grade converters in Baosteel,the article analyzes and elaborates the significance of independent integration of 300 t grade converters in Zhanjiang,major targets of the independent integration in converter process technologies,equipment packages and controls,the innovated critical technologies and comparison with overseas advanced technologies,major technical difficulties in the integration in Baosteel and their solutions,as well as general mindset and final objectives of the project.The total integration of technology for Shanghai No.1 Steel Making Plant of Baosteel was undertaken by Nippon Steel.And Kawasaki Steel was responsible for the total integration of technology for 4# and 5# converters of Shanghai No.2 Steelmaking Plant of Baosteel.Based on digestion,absorption and innovation of the introduced technologies,Baosteel has firstly achieved the independent integration of 6# converter,5# RH and 3# LF projects in the Shanghai No.2 Steelmaking Plant of Baosteel.Therefore, Baosteel shall take advantages of the favorable conditions and experiences and advanced steel making technologies of Baosteeel to master the imported new steelmaking technologies in the world and then form the advanced complete set steel making technologies and equipment at home and abroad.The achievement of independent integration of Zhanjiang Steel Making Project will make the breakthrough for the construction of large - sized steel making plant in Baosteel.300 t converter technology integration is undertaken by Baosteel independently in instead of by the foreign side in the past. 相似文献
20.
水化学环境对湛江组黏土结构强度的影响研究 总被引:1,自引:0,他引:1
为研究水化学环境对湛江组黏土结构强度的影响,收集湛江地区地下水水文地质资料,并通过钻孔取水进行化学分析,分析该区地下水的化学环境与影响因素;利用离心过滤法提取土中水溶液,调查土中溶液的化学成分与特性;在此基础上,采用选择溶解法去除土中胶结物质,利用扫描电子显微镜与能谱分析,对比分析去除胶结物质前后的微观结构变化。研究表明:湛江地区的地下水与湛江组黏土中水溶液的化学构成与比例含量基本一致,水化学类型为Cl-Na型,表现出偏酸性与富含铁离子的特征,水中大量的铁为土颗粒的联结提供了胶结物质,酸性环境促使游离氧化铁产生胶结效果进而提高土的结构强度。最后,提出了考虑地下水环境影响的湛江组黏土结构强度的形成机理,研究表明湛江组黏土较强的结构性源于开放式的絮凝结构加上颗粒间的强胶结作用。 相似文献