Economic effectiveness of manufacturing piston rings by the powder metallurgy method

Conclusions The presented calculation shows that the production cost of piston rings by the powder metallurgy method is 32% less than by the casting and machining method. Based on the manufacture of 10 million sets of rings, the annual economic effect amounts to 6 million rubles.No. 6(78), pp. 91–96, June, 1969.     

CME--what works?

AIM: To compare the inhibitory effects of 3 opioid receptor agonists, (D-Ala2, NMe-Phe4, Gly-ol)-enkephalin (DAGO), (D-Pen2,5)-enkephalin (D-PEN), and trans-(+/-)-3, 4-dichloro-N-methyl-N-[2-(1-pyrrolidinyl) cyclohexyl]-benzeneacetamide methanesulfonate (U-50488H) in different concentrations on synaptic transmission. METHODS: The excitatory postsynaptic potentials (EPSP) in slice preparation of nucleus accumbens of rats were recorded using electric stimulation of the olfactory tubercle area and intracellular micropipettes filled with potassium acetate (3 mol.L-1). RESULTS: Superfusion of DAGO, D-PEN, and U-50488H (1 mumol.L-1) reduced the amplitude of EPSP and the inhibitory effect on EPSP were reversed by superfusing naloxone (Nal, 1 mumol.L-1), in which the DAGO-induced reduction of synaptic transmission was the most effective. The depolarizing responses to microiontophoretic injection of glutamate were reduced by superfusing DAGO in 19 neurons of slice preparation of nucleus accumbens. CONCLUSION: The inhibitory effects of DAGO, D-PEN, and U-50488H on EPSP were in a concentration-dependent manner, and the mechanism of opioid agonists (at least DAGO) reducing EPSP was related to a decrease of postsynaptic transmission mediated by glutamate.     

Postoperative education that works

Perioperative nurses have acquired greater responsibility for patients' and family members' postoperative education. Recent nursing research indicates that patients may not be getting specific information about dealing with the everyday practical matters they encounter while recovering at home from their surgical procedures. This article addresses some of these issues (e.g., food, sex, driving, bathing, wound care, return to work, limits on activities). The authors answer questions most often asked by patients and their family members.     

鲁迅写酒

鲁迅本人长期饮酒,其对酒的认识也比别人深刻,付之笔端,便形成不少对酒的描写和论述.介绍鲁迅在其诗歌、小说、散文中有关酒的描写.     

Supervision: how it works

While much has been written about the value of clinical supervision and theoretical models of how it should take place, few accounts exist of how it works in practice. This paper illustrates how supervision was implemented within a directorate in one trust. Both pitfalls and successes of the project are highlighted together with a summary of the evaluation. Evaluation demonstrated that two-thirds of those receiving supervision valued it highly.     

浅谈垃圾土的工程性质

随着中国经济迅猛发展,不可避免要面对垃圾占用的大量土地的再利用问题,本文通过国内外大量试验,对垃圾土的基本工程性质进行了探讨,分析并总结出垃圾土的部分工程性质。     

印刷厂废胶片上银的回收

以硝酸和过氧化氢的混合溶液为银的溶解液,对印刷厂废胶片上银的回收进行了研究.考察了硝酸的浓度、溶解温度对银溶解速度的影响,结果表明:硝酸的浓度为7 mol/L、溶解温度为60℃时,溶解速度较好,且在银的溶解过程中不产生NO、NO2有毒气体,有利于环境保护.     

Development of the manufacture of armor steel in the Magnitogorsk metallurgical works

The main stages of development of the process of production of armor steel in the Magnitogorsk metallurgical works are described from the beginning of the Second World War to date.