固体电解质ZrO2（Y2O3）粉末的制备研究

本文比较了几种制备方法及Y_2O_3含量对ZrO_2材料性能的影响,提出了ZrO_2立方相的稳定机理。结果发现,在相同Y_2O_3含量条件下,不同制备方法制得的粉末其晶相中ZrO_2立方相体积分数有较大差异。随Y_2O_3含量的增加,粉末晶相中立方相体积分数迅速增大,其立方相晶胞参数逐渐增加,而当Y_2O_3含量增加到9mol%时,晶胞参数反过来又减小。SEM照片表明,随Y_2O_3含量的增加。ZrO_2粉末颗粒逐渐增大,Y_2O_3含量大于6mol%时,ZrO_2粉末形状变得较不均匀规整。Y_2O_3含量较低时,ZrO_2粉末才具有较好的烧結性能。     

企业财务管理过程中有关问题的思考

在当前我国社会主义市场经济条件下,财务管理的目标应是企业价值最大化、追求企业价值的提升和战略上的竞争地位.本文对企业财务管理过程中的企业筹资管理、企业投资管理、利润分配管理、现金流量管理、财务控制5个方面进行了浅述.     

A new era of nuclear astrophysics research in China

Nuclear astrophysics is a rapidly-growing interdisciplinary branch of physics involving a close collaboration among researchers in nuclear physics,astrophysics,and observational astronomy.The origin and fate of matter in our Universe are the primary questions in the nuclear astrophysics     

Chemical composition and antioxidant activity of essential oil from Magnolia grandiflora L. seed

The chemical composition and antioxidant activity of Magnolia grandiflora L.seed essential oil were examined.By combining gas chromatography and mass spectrometry (GC-MS),16 types of compounds were identified,including 40.91% oxygen-containing terpene derivatives,19.51% terpenes,13.97% esters,13.05% nitrogenous compounds,and 3.64% acids.Its capability of removing hydroxyl free radical was lower than that of V c,but it was closer to V c with increasing concentration.In cell experiment,all essential oil concentration (6.9,13.8,27.7,55.5,111.0,and 222.0 g/mL) groups increased cell proliferation by 26% or more (26.0%,38.8%,44.8%,40.2%,35.8%,and 30.4%,respectively).In rat experiment,the SD rats group showed an at least 38% rise (38.62%,61.68%,and 62.86%,respectively) in glutathione-peroxisome (GSH-Px)activity,which is more than 24% reduction (29.56%,24.30%,and 36.93%) in malondialdehyde (MDA) content,and no significant difference in SOD activity was found.The results show that the essential oil had strong antioxidant activity,without dose effect within the concentration range.     

An initial discussion on major controlling factors on formation of coal-formed large-medium gas fields

The so-called "large-medium gas field" means a gas field with proven reserves equal to or larger than 100×108 m3.Up to 1997,23 coal-formed great-medium fields are discovered in China,excluding two in Taiwan Province.Their proven reserves take 50.9% in total natural gas reserves.Therefore,the coal-formed great-medium gas field plays a decisive role in natural gas reserves and the study of their controlling factors is very important both in theory and in practice.There are six major controlling factors on the formation of coal-formed large-medium gas fields:(ⅰ) The generating center of coal-formed gas and its surrounding area; (ⅱ) low potential area; (ⅲ) late pool-forming period; (ⅳ) traps related to the paleo-uplifits in coal-formed gas area; (ⅴ) above or between abnormally pressured compartments; (ⅵ) faulted traps related to coal-bed.     

检测老年肝病患者血浆凝血酶原活性的临床价值

目的：探讨凝血酶原活性（FⅡ，CA）与老年肝病患者肝功能的关系，方法：应用巨齿蛇毒发色底物法检测老年肝病患者凝血酶原活性105例，结果：疾病组正常老年人（大于等于60岁），青壮年（小于等于45岁）的FII，CA有明显差异，老年肝病患者的FII：CA明显低于健康老年人，结论：老年肝病患者应及时检测FII：CA。     

薄树人先生与中国天文学史研究

薄树人(1934-1997年)是当代中国天文学史界的代表人物.50年代他毕业于南京大学数学天文系,立志从事天文学史研究.60年代他和著名天文学史家席泽宗合作,以<中、朝、日三国古代的新星记录及其在射电天文学中的意义>蜚声国际天文学、科学史界.在40年的学术生涯中,他在中国古代天文学的系统整理与研究、天象记录、恒星观测、历法、天文学家、天文仪器、天文台、中外天文学交流、天文学史文献学、天文学思想等方面都做了大量重要工作.他是中国天文学史研究重要学术组织者和学科带头人之一,以他毕生的精力为中国天文学史研究事业作出了重大的贡献.该文是为纪念薄树人先生逝世1周年而作,是一篇简略的学术传记.     

区间数结合算子模糊逻辑及λ—归结

（０，１）上的所有区间数作为一个结合算子格Ｌ１，本文在此格上建立了一种新的模糊逻辑系统ＩＯＦＬ，讨论了该逻辑系统的一些性质，范式表示及λ－归结等问题。     

黄毛杜鹃种子发芽率的研究

对黄毛杜鹃种子进行了不同发芽温度，不同预处理的发芽试验。结果表明，黄毛杜鹃种子适宜的发芽温度为室温（１５℃－２０），黄毛杜鹃种子在０．１２５％Ｈ２ＳＯ４中处理１０ｍｉｎ或在０．０５ｍｇ／ｍｌＡＢＴ生根粉中处理ｚｈ后播种，可提高子发芽率。     

平移变换的拓扑混合性

本文考虑(Z~+)~Z 上的右移位变换,证明了齐次子移位∧上的右移位变换σ|∧拓扑混合的充要条件为:i)存在∈A∧,使得{_n;n≥0)={n;n<0)=Z~+ii)存在 x,y∈∧,使得(p_x,p_y)=1。其中 p_x,p_y 分别为 x,y 的周期。