聚丙烯市场分析及预测

本文综述了聚丙烯国内外发展概况,国内产需平衡,进出口、“八五”“九五”发展情况,对1993年聚丙烯市场进行了预测。     

聚丙烯市场分析及预测

本文综述了聚丙烯国内外发展概况,国内产需、进出口及“八五”、“九五”发展情况,对1993年聚丙烯市场进行预测并提出了改进建议。     

聚丙烯市场分析及预测

本文综述了聚丙烯国内外发展概况,国内产需平衡,进出口,“八五”、“九五”发展情况,对1993年聚丙烯市场进行了预测并提出了改进建议。     

聚丙烯市场分析及预测

本文综述了聚丙烯国内外发展概况,国内产需平衡,进出口“八五”“九五”发展情况,对1993年聚丙烯市场进行了预测并提出了改进建议     

聚丙烯市场分析及预测

本文综述了聚丙烯国内外发展概况,国内产需平衡,进出口,“八·五”、“九·五”发展情况,对1993年聚丙烯市场进行了预测并提出了改进建议。     

聚丙烯市场分析及预测

本文综述了聚丙烯国内外发展概况、国内产需状况、进出口情况及“八·五”、“九·五”有关发展目标,对1993年聚丙烯市场进行了预测并提出促进我国PP生产发展的建议。     

聚丙烯市场分析及预测

本文综述了聚丙烯国内外发展概况,国内产需平衡,进出口情况,国内“八五”“九五”正建和拟建项目情况。对1993年聚丙烯市场进行了预测,并提出了改进建议。     

我国将发展本体法聚丙烯生产

我国将发展本体法聚丙烯生产,这是中国石化总公司在上海召开的“本体法聚丙烯专业会议”所透露的消息。目前,我国原油的催化裂化能力已达2600万吨/年,占原油一次加工能力的比例仅次于美国而居世界第二位;就工艺水平,装置规模而言也较先进。“七五”期间,催化裂化仍是重点发展项目,致使炼厂气资源供应充沛,发展聚丙烯大有潜力。     

燕化公司车用和管材专用料通过技术鉴定

由中国石化北京燕化石油化工股份有限公司聚丙烯事业部(简称燕化聚丙烯事业部)和树脂应用研究所共同承担的中国石化集团科研课题“建筑用聚丙烯管材专用料的研制开发”和“气相法汽车用高流动共聚聚丙烯的开发”于20014年8月20日通过了由中国石化集团组织的技术鉴定。     

聚丙烯分子链结构调控新技术

作为中石化第三代环管聚丙烯（PP）技术的核心技术之一，由北京化工研究院和镇海炼化分公司组织完成的“聚丙烯分子链结构调控新技术及应用”项目已成为高性能聚丙烯产品开发的新平台。多种高性能新产品正不断在此技术平台上被开发出来，为下游塑料加工企业降低生产成本、降低产业链生产能耗、减少污染性化学品的使用和气体排放作出了贡献，推进了我国聚丙烯行业的跨越式发展。该项目由此获得2012年国家技术发明二等奖。     

Analysis of Syrian lustre pottery (12th–14th centuries AD)

Lustre is a product of skilled artisans and its production was spread to different regions by the migration of artisans. Each lustre production has its own peculiarities not only in the composition and microstructure of the lustre but also in the paste and glaze compositions, processing and firing conditions. Syrian lustre is particularly interesting as it shows technological innovations with respect to the earlier Abbasid and Fatimid lustre productions with the use of transparent tin-free glazes (often alkaline) and stonepastes. In particular, the use of alkaline glazes required the introduction of technological novelties in order to increase the chances to produce a metallic-like shining lustre. We present first studies made on the lustre layer of early Syrian productions, namely Tell Minis (first half 12th century AD), Raqqa and related wares (second half of the 12th century AD and first third of the 13th century AD) and Damascus (second half of the 13th century AD and 14th century AD).     

Chimiscope: a multi-faceted laboratory platform for a unique journey into (bio) molecular science

The University of Geneva, its Faculty of Science, and its School of Chemistry and Biochemistry have created the Chimiscope, a show to intrigue and to incite interest in the science of molecules and biomolecules. The Chimiscope will be inaugurated on the 24th November 2011.     

灭蝇胺及其代谢物三聚氰胺在大棚黄瓜上的残留降解动态

[方法]采用亲水作用色谱-串联质谱法研究了灭蝇胺及其代谢物三聚氰胺在大棚黄瓜上的残留降解动态,为大棚黄瓜中灭蝇胺的安全使用提供科学依据。[结果]50%灭蝇胺SP以田间推荐用量150 g a.i./hm2(对水600 kg/hm2)喷施1次后,灭蝇胺在大棚黄瓜上的残留量于药后5 d达到最大值,为0.230 mg/kg。以0.230 mg/kg为原始沉积量,灭蝇胺在大棚黄瓜上的残留降解动态符合一级动力学方程,半衰期为14.3 d。处理后28 d内,黄瓜样品中三聚氰胺的残留量一直在增加,但其残留量均低于灭蝇胺的残留量。在最后1次采样时(药后28 d),三聚氰胺和灭蝇胺的残留量趋于相同。[结论]以0.2 mg/kg为灭蝇胺在黄瓜上的最高残留限量,建议灭蝇胺在大棚黄瓜上的安全间隔期为7 d。     

镇海炼化完成大检修

5月15日,Ⅰ套PP装置完成检修开工一次成功,标志着镇海炼化分2个系列、涉及炼油、化工、码头三大区域38套主体生产装置和辅助系统、4498项检修改造项目、历时92天的2012年检修、改造战役完美收官,实现了"安全、环保、优质、准点、文明"的目标。     

新一代水性木工构件用丙烯酸乳液的耐候性研究

介绍了木工构件涂料用水性丙烯酸优越条件,系统阐述了第四代产品即水性丙烯酸本身最优化的聚合过程和合成,体现了自身的耐候性特点,最终实现罗门哈斯第四代丙烯酸乳液完全达到建筑构件市场的要求。     

A class of modified high-order autoregressive models with improved resolution of low-frequency cycles

Abstract.  We consider regularly sampled processes that have most of their spectral power at low frequencies. A simple example of such a process is used to demonstrate that the standard autoregressive (AR) model, with its order selected by an information criterion, can provide a poor approximation to the process. In particular, it can result in poor multi-step predictions. We propose instead the use of a class of p th order AR models obtained by the addition of a pre-specified p th order moving average term. We present a re-parameterization of this model and show that with a low order it can provide a very good approximation to the process and its multi-step predictions. Methods of model identification and estimation are presented, based on a transformed sample spectrum, and modified partial autocorrelations. The method is also illustrated on a real example.     

Evolution of azulejo glaze technology in Portugal from the 16th to the onset of the 19th century

Azulejos have been applied to architectural settings in Portugal for the last five centuries and represent one of its most unique art forms. In this article a group of representative samples regarding the chronology and typology of the majolica azulejos produced by the Lisbon workshops from the second half of the 16th century (beginning of majolica azulejos production in Portugal) up to the first quarter of the 19th century (after which more industrialized manufacturing processes were introduced) are studied. SEM-EDS was used to obtain morphological and chemical information on the glazes, ceramic bodies, and their interfaces. The results show that a major shift from lead-rich to lead-alkali glazes occurred in the transition from the 16th to the 17th century, while from then to the end of the studied period the same basic technology prevailed. The Lisbon tiles production is also considered in the European context.     

汽车尾气污染及净化研究的进展

机动车尾气污染已经成为中国大气污染的主要来源之一。净化机动车尾气主要包括：1、尾气催化净化：2、复合燃油添加剂的研究；3、微乳化燃油的研究；4、物理方法净化燃油。改变和提高燃油的综合性能，减少汽车尾气污染是当务之急。     

Low-Energy Laser-Driven Ultrashort Pulsed Electron Beam Irradiation-Induced Immune Response in Rats

The development of new laser-driven electron linear accelerators, providing unique ultrashort pulsed electron beams (UPEBs) with low repetition rates, opens new opportunities for radiotherapy and new fronts for radiobiological research in general. Considering the growing interest in the application of UPEBs in radiation biology and medicine, the aim of this study was to reveal the changes in immune system in response to low-energy laser-driven UPEB whole-body irradiation in rodents. Forty male albino Wistar rats were exposed to laser-driven UPEB irradiation, after which different immunological parameters were studied on the 1st, 3rd, 7th, 14th, and 28th day after irradiation. According to the results, this type of irradiation induces alterations in the rat immune system, particularly by increasing the production of pro- and anti-inflammatory cytokines and elevating the DNA damage rate. Moreover, such an immune response reaches its maximal levels on the third day after laser-driven UPEB whole-body irradiation, showing partial recovery on subsequent days with a total recovery on the 28th day. The results of this study provide valuable insight into the effect of laser-driven UPEB whole-body irradiation on the immune system of the animals and support further animal experiments on the role of this novel type of irradiation.