全日制六年制重点中学单课性选修的高中二、三年级化学课本编写提纲(征求意见稿)

原子核。同位素。电子云。电子层和电子亚层。s电子云和p电子云的图象。d电子,f电子。电子的自旋。 H到Kr的电子层排布。原子结构与周期系。元素周期表根据原子的电子层结构分区~*。化学键。离子键。共价键。配位键。元素的电负性。极性分子与非极性分子。氢键。离子晶体。原子晶体。分子晶体。     

信息与服务

O协。N00。闪00。NO仍。门00。价00.州O叭。N00。N00。价00。曰00。仍00。NO叭。N00。NO叭。NON。1O叭。N00。NO口户N00。N00。N00 .2O叭。NO仍。阶O叭。N恤习l四1尺!浑号。补半甥冷坎卜O﹃邢日补牟欢咨比解琴劣卞穴答.’补妞小佘褪众吝︸补牟别滓穴名︸朴牟澎褥尺g︹补习书叹权一09旧哄习。谧补故补半哭长习汉任中成外曰州。066一闪一。一协6一Z一.一66一内一。1661州一。1661刊一.一66一10.16伍一刊︸。1661叫︻.0661州一。1661N一。︻661N工.1661N一。︻661N一。一66︻囚州。1661一0.州66一囚一。工比61一O。叫6小︻州0.问…     

尖晶石对β／β″—Al2O3膜相组成和离子导电性的影响

以wag／P”－AI。O。为固体电解质的CO。、SO。、NO。等气体传感器的研究已有很多报道［‘－‘］，多采用的是个AI。O。结构的电解质。AI刀。和p”－AI刃。的结构具有一定的相似性，但后者具有更高的迁移离子浓度和更开放的晶体结构，表现出更好的离子导电性‘’‘．由于卢”－AI。O。为介稳结构，需要加入如Li。O、MgO等作为稳定剂才能稳定存在．以Li对稳定的产”－al。O。烧结较容易，P”－AI。O。相转化率高，但以MsO为稳定剂制备的”－AI刃。其显微结构和抗吸湿性能更为优越．LJLi对和MgO共同稳定的产”－AI。O。可以…     

全日制六年制重点中学侧重理科选修的高中化学课本编写提纲(征求意见稿)(续)

高中二年级(每周4课时,共128课时)(一)物质结构(25)原子核。同位素。电子云。电子层和电子亚层。s电子云和p电子云的图象。d电子、f电子。电子的自旋。H到Kr的电子层结构。原子结构与周期系。元素周期表根据原子的电子层结构分区。化学键。离子键。共价键。键角和键能(与生成热相联系)。配位键。元素的电负性。极性     

第二届国家期刊奖科技期刊名单

————3”区Li“川—产队 究所‘”然科学版)-仪阿4”y卜人于2。。。。。中。。。。。。。。。。17 吉霉坤”””’”。。。。。。。中。。。。。。。。。。r。。。。,。中。。。。旧。。。。。。。g”“““g票寞宗羌民’-4。。。华。、。。中。。。中华。。。19。。。。。;2腆-厂 北。机。。。。5 物理学报 中国科学院 中科院物理所20 上海环境科学 上海市 卜海市环保局6 高等学校化学学报 教育部)}林大学、南“大ZI 中国药学杂志 中国科协 中国医学会7 金属学报 中国科协 中国金属学会22 金种铸。及有色合 中国科快 中闷机械工程学《…     

TiO2-Al2O3作为Mo催化剂担体的研究

Tio。－AI。oa二元氧化物的制备at艺大体可分为两种．一种是利用液相浸渍或气相沉积方法将Tio。担载在AI。0。上，使Tio。主要覆盖在AI。0。表面上［‘－1另一种是通过Ti盐和AI盐混合溶液共沉淀方法使Tio。和AI。0。均匀混合在一起【‘－’1．不同的制备工艺对Tio。－AI。03的表面结构和表面性质有很大影响问．我们曾报导用TICly蒸气化学气相沉积方法制备出了D02在1川2O3表面呈现十分均匀分布的DoZ一周。03复合氧化物担体＊’1．本文进一步考察D0。在周。0。表面的沉积对川。0。孔结构的影响，以及Ti02－A1203作为加氢精制MO催…     

全日制六年制重点中学高中一年级化学课本编写提纲(求证意见稿)

复习初中学过的重要基础知识和基本技能。(9) (一)摩尔(12)物质的量的单位——摩尔。阿佛加德罗常数。关于摩尔的计算。气体的摩尔体积及其计算。溶液的摩尔浓度及其计算。反应热及其计算。热化学方程式。燃烧热。说明:中和热在高二讲述。     

第26届国际化学奥林匹克竞赛理论试题答案

第２６届国际化学奥林匹克竞赛理论试题答案吴国庆编译（北京师范大学化学系１００８７５）８一＠（ａ）ＨＬ十Ｈ。Ｏ—Ｈ。Ｏ十十Ｌ－Ｋ。。一１．４·１０－‘；Ｃ。。一３．００·回旷’Ｋ。。一［Ｈ。Ｏ”］’／｛Ｃ。。一［Ｈ。Ｏ”」｝（·；Ｃ／Ｋ—３·１０－’／...     

全日制五年制中学高中化学课本编写提纲(征求意见稿)

(一)卤素(11)氯气的性质和用途。用电子得失或转移来说明氧化-还原反应。漂白粉。氯气的制法。氯化氢。氟、氯、溴、碘和它们的重要化合物。卤素性质的比较。说明:盐酸的性质在初中里讲,本章只讲氯化氢。     

十六字令 四首

新,传播新知建功勋。促四化,培育后来人。基,根深叶茂果如期。培沃土,百花满生机。通,杂交渗透贯纵横。百科间,万里架长虹。普,善把艰深化通俗。读者众,效益更突出。     

Fourty years of thermal analysis in Hungary

A brief survey is presented of the development of thermoanalytical methods, in Hungary and abroad between 1900 and 1990, and reveals a connection between the processes.An overall picture is given of the activity of Hungarian thermoanalysts in basic research, the development of instruments and organizational work in science between 1950 and 1990.     

实验室从ISO/IEC指南25-1990质量体系向ISO/IEC 17025-1999质量体系的过渡

对ISO/IEC17025-1999和ISO/IEC指南25-1990进行了比较，分析了ISO/IEC17025-1999的显著变化，提出了由ISO/IEC指南25-1990质量体系向ISO/IEC17025-1999质量体系过渡的措施。     

符合ISO/IEC指南25-1990的实验室质量体系向ISO/IEC 17025-1999标准过渡的文件修改

按照ISO／IEC指南25－1990建立起较完善的质量体系的实验室,可通过对质量体系文件进行适当增补或少量删减,以实现向ISO／IEC 17025－1999标准的过渡。对质量手册,按照ISO／IEC指南25－1990的13个要素逐个讨论了具体的增删内容;对程序文件,则按ISO／IEC 17025－1999要求逐个列出了应有的程序。     

Phenylurea and Triazine Herbicides in the Garonne River (France) During High Flood and Low Water Periods

Abstract

Phenylureas and triazines were analysed by reversed-phase liquid chromatography using UV detection at 254 nm after an on-line preconcentration step on a PRP-1 copolymer in order to determine pesticides in river water at μg/1 level or lower. Running water was sampled in the Garonne from a station located at La Réole, upstream from Bordeaux and from a small tributary, the Dropt. Water samples were collected mainly at several periods between December 1989 and September 1990 at a low water time (December 1989) and during two high flood periods (February 1990 and May 1990). Atrazine, simazine, de-ethylatiazine, diuron, chlortoluron and isoproturon were detected and quantified. In the Garonne river, atrazine, simazine, de-ethylatrazine and diuron were usually present at the sampling time, whereas chlortoluron and isoproturon maximised during the winter flood (February). In the Dropt river, triazine concentrations were normally between 1.0 and 0.1 μg/1 and maximised at 2.2 μg/1 during the spring flood (June 1990). De-ethylatrazine/(Atrazine + Simazine) ratio seems to be significantly higher than in the Mississippi river and may be in relation to the use of simazine in the drainage basin. These data are in agreement with seasonal applications of phenylurea and triazine herbicides and hydrologic and pluviometric conditions.     

Organic Compounds in Surface and Deep Antarctic Snow

Abstract

Eight surface snow samples taken during the 1987/88, 1988/89 and 1990/91 Italian Antarctic Expeditions and six samples collected at different depths from two dissimilar sites during the 1990/91 Expedition, were analyzed for the non-chlorinated organic content using the GC capillary columns technique and GC-MS. Several biogenic and anthropogenic classes of organic compounds were identified and quantitatively determined. The data obtained give a more complete picture of the pollution level in Antarctica.     

Interannual variability in solar ultraviolet irradiance over decadal time scales at latitude 55 degrees south.

Ground-based measurements of solar UV spectral irradiance made from Ushuaia, Argentina at latitude 55 degrees S reveal a large degree of variability among corresponding months of different years over the period from September 1990 through April 1998. The magnitude and wavelength dependence of year-to-year changes in monthly spectral UV-B irradiation are consistent with expectations based on the behavior of column ozone and cloudiness. When combined with satellite measurements of column ozone, a regression model fit to the ground-based data set allows estimates of monthly UV-B irradiation over a time frame of two decades, 1978-1998, during several months of the year. Results show a general increase in ground-level irradiation at 305.0 nm from the end of the 1970s to the early 1990s during calendar months from September through December. This is followed by generally smaller irradiances through the middle to late 1990s for all months except November, where the increase continues through the end of the data record. The long-term variability in monthly irradiation over the time period studied is more complicated than can be described by a simple linear trend.     

SEASONAL TRENDS IN ERYTHEMAL and CARCINOGENIC ULTRAVIOLET RADIATION AT MID-SOUTHERN LATITUDES1989–1991

A network of solar carcinogenic/erythemal ultraviolet radiometers has been established in New Zealand. Daily integrated irradiances of this biologically harmful ultraviolet radiation for 1989, 1990 and 1991 are reported from radiometers located at Wellington (41°S) and Christchurch (43.5°S) and for 1990 and 1991 from the Auckland (37°S) radiometer. Although the monitoring program has not been running sufficiently long to discern any long-term changes in levels of solar ultraviolet radiation, shorter term trends are apparent, which are attributed to a seasonal cycle in levels of ozone at midlatitudes and changes in atmospheric aerosols.     

An overview: origins and development of green chemistry

This article provides an overview of the origins and development of green chemistry. Aiming to contribute to the understanding of green chemistry, basically from a historical point of view, this overview argues that contextual influences and the user friendliness of the term are drivers for the explosive growth of green chemistry. It is observed that political support for its development has been significant, in which the Pollution Prevention Act of 1990 was a formal political starting-point, but informally the origins of green chemistry go back to before 1990. US EPA played an important role in all this, but did not solely contribute to the growth of green chemistry.     

Twenty-five years of micellar electrokinetic chromatography

Micellar electrokinetic chromatography (MEKC), which can separate neutral analytes as well as charged analytes by the capillary electrophoretic technique, was developed in 1982 and the first paper was published in 1984. The authors’ group concentrated their effort into the characterization of MEKC as a separation technique until early 1990s. Most issues in MEKC separations were successfully solved and wide applicability of MEKC was verified in 1990s. In particular, sweeping, an on-line sample preconcentration technique, was very successful for the concentration of neutral analyte as well as ionic ones. In this paper, our studies on MEKC will be summarized from the personal viewpoint of the author.     

共混组分对PEEK结晶的影响

本文综合了90年代以来聚醚醚酮共混的一些工作，综述了第二组分对聚醚醚酮结晶的影响。