印尼农业的技术效率和远期生产增益

一、引言本文目的是评定印尼粮食经济今后能否借助农户技术效率的提高来增大生产效益。下面我们将检验关于种值水稻和杂粮作物(木茨、花生和豆类)的印尼农场抽样样本的技术效率。此外,我们也将评估技术效率、农场规模和农场位置的关系。     

猪水泡病病毒和科赛奇B_5病毒的比较电泳检查

科赛奇B_5病毒和猪水泡病病毒的纯化悬液是经过收获和细胞团块病毒的纯化制备的。用纯化的N和H抗原级份(完整颗粒和中空颗粒)进行交叉免疫电泳。曾计算了三株猪水泡病病毒(UKG 72、HK 71和Italy 66)和二株科赛奇B_5病毒(Faulkner和8068)N抗原级份的相对迁移速度(RMV)。科赛奇B_5病毒的标准株(Faulkner)具有与最先分离到的猪水泡病病毒株Italy 66几乎一致的低相对迁移速度。一株科赛奇B_5最近分离株(8068,1973在英国分离到的)具有与1972年在英国分离到的猪水泡病病毒UKG 72株十分近似的比较高的相对迁移速度。同样,猪水泡病病毒香港毒株(HK 71)也具有高相对迁移速度值。最后讨论了这些观察结果与猪水泡病的出现之间的联系。     

没有敌人的革命:政治学中的重要转型

美国政治科学一直是一门先天性动荡不安的学科,它见证了一系列旨在对其基本特性进行重新定位的运动。本文比较了四次重大的运动:分别是伴随着学科早期专业化的国家主义(statism)     

中俄关系中一份具有历史意义的文件——纪念中俄《睦邻友好合作条约》签署10周年

2011年是中华人民共和国和俄罗斯联邦缔结《睦邻友好合作条约》10周年，本刊特别约请俄罗斯联邦驻华大使S．S．拉佐夫先生撰写文章，以飨读者。     

通过辨别、对比和检验材料中的变化测定文件日期

对一份文件最早制成时间的检验一直以来都是全世界文检界的难题之一。核实可疑文件的制成时间没有统一的方法,目前主要通过对纸张、墨迹、打字机、复印机、打印机、传真机、印刷品,以及笔迹和签名等因素的检验来确定一份文件的制成时间。文件检验人员需要充分利用他们手中的文件的内容及文件周边信息所反映出来的条件和材料,进而得出结论。     

Sexually active but not pregnant: A comparison of teens who risk and teens who plan

Previous studies have compared contraceptive users with nonusers, and pregnant teens with nonpregnant ones. This paper reports the findings of a study of a sample of 119 women aged 21 and under who visited the Young Adult Clinic at Columbia-Presbyterian Medical Center in New York City during 1981. All of these women had been sexually active for a year or longer, but had never been pregnant. The expectation that such a sample would include mainly consistent users of contraception was unwarranted; within this special population were found young women who had never used contraception or who had only been sporadic users, as well as the consistent users. Moreover, there are many more similarities than differences among these groups, and their stated motivations for not becoming pregnant are the same. The consistent contraceptors were more likely to live with their mothers, to have mothers who worked, to indicate that their parents would help them have an abortion, and to indicate they would have an abortion should they become pregnant. The similarities between these young women are very important for programs, which often rely heavily on stated motivation or even on a clinic visit as evidence that a young woman intends to use a birth control method. There is nothing here to support this simple view. Instead the notion is substantiated that many adolescents may lack cognitive consistency on this subject or may lack the future orientation to be effective contraceptive users.     

State secrets: access to information under the Human Reproductive Technology Act 1991 (WA)

Many Australian children have a biological father who gave his sperm so that the child's mother could conceive and raise them. Many of these children, and their parent(s), do not know who that biological father is. However, some want to know. The article examines the Western Australian law on access to information about the identity of parties in these arrangements. It is argued that there is an implied right to access identifying information where all parties consent to the exchange of information; that this right has been ignored in official and medical practice and opportunities for good record-keeping missed; and that the current law allows a parent to give consent to the exchange of identifying information on behalf of their child at any time after the child is conceived.