Seasonal changes of endogenous ABA and cytokininsin environmental adaptation of differentecotypes of reed plants

ＳｅａｓｏｎａｌｃｈａｎｇｅｓｏｆｅｎｄｏｇｅｎｏｕｓＡＢＡａｎｄｃｙｔｏｋｉｎｉｎｓｉｎｅｎｖｉｒｏｎｍｅｎｔａｌａｄａｐｔａｔｉｏｎｏｆｄｉｆｆｅｒｅｎｔｅｃｏｔｙｐｅｓｏｆｒｅｅｄｐｌａｎｔｓＷａｎｇＨｏｎｇｌｉａｎｇ，ＺｈａｎｇＣｈｅｎｇｌｉ...     

The epidemic characteristics of Kaschin-Beck disease (KBD) in different eco-environments

Epidemiological survey of 573 families, clinical examination of 2593 persons, and X-ray examination of 1136 persons (in 16 typical endemic villages) were conducted, based on the classification of endemiology for KBD disease areas, i.e, mountain type, loess plateau type, plateau type, and flatlands type. It was revealed that the KBD disease areas exhibited the regular pattern of corming-into-being, development and passing-away and the characteristics of growth and decline. Further, it was found clinically that the disease areas may be divided into 4 types, i.e., recent onset, developing, stable, and historical. This division is simple and easy, practical, scientific, and reliable and can be applied by medical personnel at different levels.     

化学法处理含酚废水的组合工艺系统和条件研究

采用化学法组合的三种工艺系统,对含酚废水进行了工艺条件的研究。结果表明,对于浓度<30mg/l含酚废水,采用氧化凝聚处理是有效的;而对于30～80mg/l含酚废水,选用氧化凝聚和吸附组合的工艺系统处理,能使排放水中酚和COD达标。     

电视机,电脑视屏与β辐射的关系

对电视机，电脑视视屏显象管壳成分进行了β放射性活性度测定及β剂量的计算，结果证明，视屏的固有电离辐射－β射线来自玻璃原材料，所产生的β剂蜈取决于原材料成分中天然放射性核素的种类含量及所用的份额。由此产生的β剂量对公众的健康不会产生有害影响。     

催化动力学光度法测定痕量铈

根据前量铈在稀硫酸介质中对重铬酸根氧化ＥＤＴＡ而褪色的反应有催化作用，建立了测定痕量铈的新动力学光度法，测定范围为０￣２．４×１０＾－２μｇ／ｍＬ，检限限为５．２×１０＾－１０ｇ／ｍＬ，用于测定人发中的痕量铈，结果满意。     

绿色高强混凝土——硅灰混凝土

硅灰是冶金厂生产硅铁和工业硅过程中产生的废灰，硅灰混凝土为绿色混凝土，它不仅节约了水泥熟料，而且改善了环境，大大促进了混凝土和建筑工程的健康发展，混凝土中掺入硅灰可得到高强和超高强混凝土，用此混凝土浇制的结构物其安全度大大提高，经济效益显著，硅灰混凝土还可以有效抑制碱骨料反应，提高结构物的安全度和耐久性，延长使用寿命。     

Turnover mechanisms of organic conformation on turbidity in drinking water

The turbidity variation in artificial water and samples from a water plant was investigated in the presence of organics with different relative molecular mass. The results show that recessive turbidity existed when water chemical conditions were changing. The formation of turbidity depended on organic relative molecular mass and their conformations on particles. At higher pH and lower ionic strength, the organic chains with a more extended conformation resulted in rising turbidity of the suspension. At lower pH, the reconformation of organics took place due to charge neutralization by the proton, resulting in a decline in turbidity. The addition of NaCl and MgCl₂ at pH 7.00 also resulted in a decrease of turbidity in the suspension. It is believed that the occurrence of recessive turbidity has a significant influence on the stability of water supply quality.     

Hydrogen storage and distribution systems

Hydrogen storage and transportation or distribution is closely linked together. Hydrogen can be distributed continuously in pipelines or batch wise by ships, trucks, railway or airplanes. All batch transportation requires a storage system but also pipelines can be used as pressure storage system. Hydrogen exhibits the highest heating value per weight of all chemical fuels. Furthermore, hydrogen is regenerative and environment friendly. There are two reasons why hydrogen is not the major fuel of toady’s energy consumption: First of all, hydrogen is just an energy carrier. And, although it is the most abundant element in the universe, it has to be produced, since on earth it only occurs in the form of water. This implies that we have to pay for this energy, which results in a difficult economic task, because since the industrialization we are used to consuming energy for free. The second difficulty with hydrogen as an energy carrier is the low critical temperature of 33 K, i.e. hydrogen is a gas at room temperature. For mobile and in many cases also for stationary applications the volumetric and gravimetric density of hydrogen in a storage system is crucial. Hydrogen can be stored by six different methods and phenomena: high pressure gas cylinders (up to 800 bar), liquid hydrogen in cryogenic tanks (at 21 K), adsorbed hydrogen on materials with a large specific surface area (at T < 100 K), absorbed on interstitial sites in a host metal (at ambient pressure and temperature), chemically bond in covalent and ionic compounds (at ambient pressure), oxidation of reactive metals e.g. Li, Na, Mg, Al, Zn with water. These metals easily react with water to the corresponding hydroxide and liberate the hydrogen from the water. Finally, the metal hydroxides can be thermally reduced to the metals in a solar furnace.     

世界青年在行动--第四届世界水环境论坛侧记

题记：对于大多数人来说。2006年3月16—22日在墨西哥城banamex会议中心举办的第四眉世界水论坛传递出来的大都是主体论坛、部长级会议的声音；不多的人会知道。在热火朝天的“成人”论坛的边缘还行走着一群朝气蓬勃的青年，他们在每天主论坛之前就开始在青年论坛上传递自己对于世界水资源问题的认识和见解；而更少人知道，每日在主论坛之后，他们还在为联合世界各地青年、采取实际行动、应对水资源问题而努力。我，很幸运地成为了这股青年力量中的一分子。亲身经历了这令人振奋的七天……[编者按]     

论地震台站的管理

本文主要介绍了地震系统中最前沿的单位——地震台站,重点阐述了北京市地震局延庆地震台的成绩、管理思路和经验,对全国地震台站的工作具有一定的参考学习意义。