共查询到20条相似文献,搜索用时 94 毫秒
1.
2.
3.
4.
莲花是最早用来装饰瓷器的花纹之一,自南朝至清代一直盛行不断。莲花又名荷花,属浮水植物,又名芙蕖、水芝、泽芝、水华、菡萏、水旦、草芙蓉、水芙蓉、玉环、六月春、中国莲、六月花神、藕花、灵草、玉芝等。荷花原产于中国,从越南到阿富汗都有, 相似文献
5.
6.
紫砂方壶,是紫砂造型中与圆壶、花壶、筋纹壶并列的一大类壶型。方壶造型古朴、形体优美、工艺严谨、气韵生动、技法独特,其整体透露出豪爽、刚劲、正直的阳刚之气,神、气堪比男子。方器造型的特点是方中藏圆,线面挺括平整,轮廓线条分明,给予人们干净利落、明快挺秀之感。整体以直线、横线为主,曲线、细线为辅,器型的中轴线、平衡线要正确、匀挺、富于变化,表现出轮廓分明、平稳庄重的方壶特点。紫砂方壶整体简洁典雅、神形兼备,线条舒展流畅,壶器刚柔相济,性格堪 相似文献
7.
通过分析重点、难点、关键及申报工作等四个层次,以计划及活动为面,以度量、资源、三性、偏差、时限为点,以费用、进度、质量、HSE为制约,以三类资料为辅助,归纳总结创优主要问题,指明关键所在,以备借鉴。 相似文献
8.
9.
10.
11.
烟气脱硫脱氮技术进展 总被引:2,自引:0,他引:2
从烟气脱硫脱氮技术的机理出发,介绍了目前有代表性的3类烟气净化技术:烟气脱硫技术、烟气脱氮技术、烟气同时脱硫脱氮技术的机理和特点。相比于单独的脱硫脱氮技术,认为同时脱硫脱氮技术具有良好的经济性和灵活的技术选择性。提出了适合我国国情的烟气污染治理技术的发展方向。 相似文献
12.
Precipitation of calcium and magnesium from seawater using CO2——Effect of temperature and salinity
下载免费PDF全文
![点击此处可从《化工进展》网站下载免费的PDF全文](/ch/ext_images/free.gif)
对CO2法脱除海水中钙离子和镁离子进行研究,控制海水的pH值恒为8,考察温度、盐度对脱钙率和脱镁率的影响。结果表明,盐度35‰的海水,30~50 ℃时脱钙率由90%增长至95%,与此同时脱镁率由0增长至42%;脱钙率、脱镁率随温度升高而升高。在温度为30 ℃时,盐度35‰~105‰的海水脱钙率可由90%增长到97%,与此同时脱镁率由0增长到67%;脱钙率、脱镁率随盐度升高而升高。将得到的固体进行XRD检测可知,产物固相组成随温度、盐度的变化而变化。由此可知,海水盐度为35‰、pH值为8、温度为30 ℃是CO2法高效脱钙的最佳工艺条件。 相似文献
13.
以粉煤灰为原料,采用超临界水热法制备了一系列的粉煤灰沸石.首先,考察了不同种类粉煤灰制备的沸石的煤气脱汞性能,以及由同一种粉煤灰制备的不同晶型沸石的脱汞活性.其次,考察了活性评价温度和H2 S气体对粉煤灰沸石煤气脱汞性能的影响.结果表明,其中的两种粉煤灰制备的沸石有较好的脱汞活性,具有方钠石晶型的粉煤灰沸石(Z5s)的脱汞性能优于具有钙霞石晶型的粉煤灰沸石(Z5c),Z5s沸石的脱汞率在360 min内保持在90%以上.气氛中的H2 S气体有利于单质汞的脱除,而温度升高时脱汞率降低.粉煤灰沸石(Z5s)采用贵金属Pd改性后,其脱汞活性在中高温时高于Z5s沸石. 相似文献
14.
15.
《Journal of Adhesion Science and Technology》2013,27(5):441-455
In this study, the magnitude of the applied removal force and its relationship to the theoretical adhesion force is determined. The removal is done through the application of known hydrodynamic drag and lift forces on submicrometer particles. The hydrodynamic removal forces are then correlated with the removal percentage and the adhesion forces. A useful correlation that can be used to determine the adhesion force from the known applied removal force and the removal percentage is presented. Below 90% removal, the data indicate a linear relationship between the removal force and the removal percentage. The effects of time on the adhesion force and particle deformation are also presented. 相似文献
16.
以实际城市生活污水为处理对象,应用改良UCT分段进水工艺研究反硝化除磷的实现途径与维持方法,探讨工艺运行参数对反硝化除磷性能的影响,并分析了强化缺氧吸磷对提高系统脱氮除磷效率的作用和稳定维持反硝化除磷的控制策略。结果表明,通过A/O分段进水工艺向改良UCT分段进水工艺运行方式的转变,可以成功富集反硝化聚磷菌,最高比例达39.2%,污泥缺氧吸磷速率为3.19~4.48 mg P·(g VSS)-1·h-1。缺氧/好氧吸磷速率和磷去除率随厌氧池体积的增加而增加,最佳体积分配为34/102/204 L(1/3/6)。控制污泥回流和内循环分别为100%相似文献
17.
Chitosan prepared from fresh water crab shells was used for hexavalent chromium removal. Kinetic studies indicated a rapid removal of chromium from aqueous solutions. The first-order rate constant for chromium removal was calculated to be 1.92 h?1. Sorption isothermal data could be interpreted by the Langmuir relationship. Drastic decrease in chromium removal was observed with the increase in pH. Sorption was almost 90% at pH 3 at an initial chromium concentration of 5 mg/L and reduced to 10% at pH 7 and above. Presence of electrolytes and chloride significantly affected the chromium removal, indicating the electrostatic attraction as the main removal mechanism. Regeneration of the sorbent with alkali was not very effective as only 60–65% of sorbed chromium could be recovered. 相似文献
18.
MDEA在气体净化领域的应用 总被引:6,自引:0,他引:6
从选择脱硫开始,经过十余年的发展,以甲基二乙醇胺(MDEA)为中心的工艺已成为气体净化领域内最具活力的工艺,可用于选择脱硫、酸气提浓、脱碳,同时脱硫脱碳和脱除有机硫,几乎覆盖了整个气体净化领域。本文评价了这些溶液体系的成就和应用特点,讨论了在发展中存在的问题并提出了一些建议。 相似文献
19.
20.
《Journal of Adhesion Science and Technology》2013,27(6):763-776
The detachment and removal of micro- and nanoparticles from surfaces is of importance in many industries. The cleaning of silicon wafers is of great interest in the semiconductor, microelectronics, and optics industries. The development and adoption of dry, rapid, non-contact, and non-damaging particle removal technologies is a critical process. The proposed laser-induced plasma (LIP) removal technique is a novel method for detaching and removing fine particles from substrates. The current technique is a dry, non-contact method that takes advantage of the strong shock wavefront from expanding plasma, created by focusing a laser pulse in air above the substrate. The transient pressure field acts on the target particles to produce a rotational moment and a rolling mode of detachment from the substrate. In the current study, the LIP removal technique is employed repeatedly to remove particles over an area of a silicon wafer, and a systematic efficiency study for the removal effectiveness is performed. A Q-switched Nd:YAG pulsed laser operating at 1064 nm with a 370 mJ pulse energy and 5 ns pulse length is used in experiments. 0.99 μm diameter silica spheres and 3.063 μm diameter polystyrene spheres were successfully detached and removed with no substrate damage. The removal efficiency at various gap distances between plasma core and substrate is determined and reported. This work is the first laboratory demonstration of the LIP technique over an extended area. The reported results substantiate the LIP removal technique as a serious option for particle detachment and removal from extended areas. 相似文献