浅论乳化沥青在公路养护中的应用

文章论述了乳化沥青、改性乳化沥青的概念及其制备过程,详细叙述了乳化沥青在工程应用中的技术标准,在道路透层、黏层、路面防水层、稀浆封层和桥面防水层等部位中的应用情况.     

蒙西侏罗纪煤低温氧化红外官能团分析

侏罗纪煤成煤时代较新,变质时间较短,与其他时期煤相比,其内在微观分子结构也存在区别。为了弄清楚侏罗纪煤原始煤样及低温氧化至200摄氏度后官能团特性及其变化规律,采集内蒙古西部地区侏罗纪煤层煤样4组作为实验对象,使用Nioclet i S5型傅里叶变换红外光谱仪,采用溴化钾压片法,分别对侏罗纪原始煤样及低温氧化至200摄氏度煤样进行红外官能团实验,并得到对应红外光谱图。实验结果表明侏罗纪煤样在低温氧化过程中(氧化至200摄氏度),羟基对煤氧复合作用有较大影响;脂肪烃是对试样煤样氧化过程中影响较大的官能团之一;含氧官能团参与了实验煤样低温氧化过程,但其影响作用较小;芳香烃对实验煤样低温氧化过程无明显影响。     

电磁搅拌制备半固态浆料的研究及应用现状

半固态电磁搅拌法是半固态成形技术中较为成熟的方法之一,并已开始应用于工业生产中.文章综述了电磁搅拌技术的特点、原理和实质,以及当前电磁搅拌技术的研究及应用现状.同时对我国半固态电磁搅拌成形技术提出了若干值得重视的问题.     

Milk Production in Tibet

This paper describes milk production and livestock production in Tibet. Some information of market demand has also been presented. There has been very little information published in Tibetan journals on production and nutrition of cattle. This review provides a brief introduction to feeding systems and feeding resources. Many studies on milk production have been done in isolation, and do not go beyond the basic and practical level. Compared with dairy cattle research in other parts of China, large gaps in k...     

Juvenile hominoid cranium from the terminal Miocene of Yunnan, China

Fossil apes are known from several late Miocene localities in Yunnan Province, southwestern China, principally from Shihuiba (Lufeng) and the Yuanmou Basin, and represent three species of Lufengpithecus. They mostly comprise large samples of isolated teeth, but there are also several partial or complete adult crania from Shihuiba and a single juvenile cranium from Yuanmou. Here we describe a new, relatively complete and largely undistorted juvenile cranium from the terminal Miocene locality of Shuitangba, also in Yunnan. It is only the second ape juvenile cranium recovered from the Miocene of Eurasia and it is provisionally assigned to the species present at Shihuiba, Lufengpithecus lufengensis. Lufengpithecus has most often been linked to the extant orangutan, Pongo pygmaeus, but recent studies of the crania from Shihuiba and Yuanmou have demonstrated that this is unlikely. The new cranium reinforces the view that Lufengpithecus represents a distinct, late surviving lineage of large apes in the late Miocene of East Asia that does not appear to be closely affiliated with any extant ape lineage. It substantially increases knowledge of cranial morphology in Lufengpithecus and demonstrates that species of this genus represent a morphologically diverse radiation of apes, which is consistent with the dynamic tectonic and biotic milieu of southwestern China in the late Miocene.     

GL（4,Z）的有限子群

从共轭的角度确定了GL(4,Z)的2阶和3阶子群     

中心根扩张的一个推广

推广了Ｈｅｒｓｔｅｉｎ关于中心根扩张的一个重要结果。     

3,5—二溴水杨醛缩邻氨基酚的单分子猝灭效应及测定痕量铜的研究

本文基于Cu(Ⅱ )与 3.5—二溴水杨醛缩邻氨基酚 (简称BSAP)和溴化十六烷基三甲胺 (CTMAB)形成络合物导致体系荧光猝灭的特性 ,提出了一种测定痕量铜的新荧光方法 .研究表明 ,试剂对表面活性剂呈现出单分子猝灭效应 (CMC浓度以下 )及胶束增敏作用 (CMC以上 ) ,单分子猝灭常数 6 .3× 10 5L/mol.该试剂对Cu(Ⅱ )具有高选择性 ,反应敏锐 .在 pH 3.8～ 4 .5的醋酸铵介质中及CTMAB存在下 ,Cu(Ⅱ )与BSAP形成 1∶1络合物 .该络合物的激发和发射波长分别为 35 5和 5 35nm ,其荧光猝灭程度与Cu(Ⅱ )量成正比 ,线性范围为 0～ 0 .3μg/ 2 5mL ,检测限为0 .2 3ng/mL ,方法用于大米中铜的测定 ,结果满意     

具有条件（S）的BCK－代数运算的分配性

给出具有条件（Ｓ）的ＢＣＫ－代数关于运算“”的一些性质，证明了此类ＢＣＫ－代数对运算“＊”和“”分别关于“∨”及“∧”是可分配的，同时若Ｘ是正关联的，则ｘｙ＝ｘ∨ｙ．     

近十年来我国期刊学论文作者的洛特卡分布研究

从《全国报刊索引》（哲社版）１９８４～１９９４年有关期刊学论文作者数入手，通过估算指数ｎ值，计算常数Ｃ及进行Ｋ－Ｓ检验最后得出我国十多年来期刊学论文作者数是服从洛特卡分布ｆ（ｙｘ）＝０．８３２０ｘ（０－２．９９３２）的结论，并对这个结论进行了某些分析．