Labour migration and the work permit system in the United Kingdom

"The aim of this paper is to examine the effects of the work permit today [in the United Kingdom], using official data. It first reviews the operation of the [labor migration] system and describes the main schemes incorporated. Then, it uses data for 1984-88 to describe the general characteristics of labor immigration through the schemes. Finally, by means of a small random sample of applications and issues, it presents details on particular aspects of the immigration. It demonstrates that current labour immigration through the system is selective: most of those entering with long-term permits are highly skilled, well paid, and moving within the internal labor markets of large transnational corporations." (SUMMARY IN FRE AND SPA)     

高Si/C高强度铸铁中C、Si、Si/C的作用及其选择

本文叙述了高Si/C高强度灰铸铁中碳、硅元素存在的形式及其对结晶过程的影响。试验表明,当碳当量一定时,随着Si/C的升高,初生奥氏体枝晶数量增多并且细化和强化,从而构成了强度的基础。该铸铁的强度模式应为“初生奥氏+共晶团”。本文对E型石墨存在的必然性和合理性也进行了讨论。     

热力系统的经济评估

上海第四制药厂在抗生素生产过程系统节能技术研究中对该厂的热能供应系统提出了３个改造方案．本文以该热力系统为例,通过对各方案的技术经济分析比较,以揭示热力系统经济评估的内在含义,并提出了用参数“净年收益”作为评估依据之一的建议．     

What lies ahead for medical management?

The consensus is that, in spite of a reluctance in Washington to undertake any drastic reform of the health care financing and delivery system, the changes that are already in place in individual organizations and that are in place or being contemplated at the state level are certain to make the health care system of tomorrow very different from that of today. Physician executives can play an important role in the transition that will be required, but they will have to use a flexible, especially nondogmatic approach if they wish to cope successfully in this increasingly whirling environment. For such physicians, the author says, the opportunities, though unknown, are enormous.     

Recent migrations from Morocco to Spain

"This study addressed the problem of the Moroccan immigration into Spain within the context of South-North movements, focusing on analyzing provisional data from the last immigrant regularization in the country completed during the end months of 1991."     

荞麦中苯丙氨酸解氨酶活力与黄酮含量的关系

荞麦幼苗及幼苗不同器官中黄酮含量随着苯丙氨酸解氨酶（PAL）活力变化而变化。X射线处理可增强荞麦幼苗中苯丙烷类代谢途径,致使黄酮含量提高。由此推测,苯丙氨酸解氨酶活力与黄酮类次生物质的形成具有密切关系。     

一类四阶非线性常微分方程的两点边值问题解的存在性与唯一性

本文利用Hammerstein型积分算子和上下解方法,研究了一类四阶非线性常微分方程的两点边值问题