Study on Ceramic Cutting by Plasma Arc

Engineering ceramics are typical difficult-to-machine materials because of high hardness and brittleness. PAC (Plasma Arc Cutting) is a very important thermal cutting process and has been successfully used in cutting stainless steel and other difficult-to-machine alloys. PAC‘s application in cutting ceramics, however, is still limited because the most ceramics are not good electronic conducts, and transferred plasma arc cannot be produced between cathode and work-piece. So we presented a method of plasma ...     

热轧层流冷却系统优化与模型参数自适应

针对热轧带钢卷取温度控制的不确定性和时变性, 利用系统优化与模型参数的自适应控制热输出辊道上带钢温度. 从控制模式、冷却策略、段跟踪和模型的再计算以及学习系数的读取等方面对系统进行了优化. 根据实际工艺状况, 实时采集现场数据对层冷模型中的参数进行自适应调整, 并就组别分类、空冷/水冷系数的回归分析进行了研究. 实践结果表明： 采用这种方法能满足现场需要, 卷取温度控制精度较高, 基本在-15～15 ℃范围内;控制效果和带钢性能良好.     

In vitro amiodarone protein binding and its interaction with warfarin

Summary The binding of amiodarone to human plasma protein and to bovine serum, albumin was studied by three different methods, ultracentrifugation, equilibrium dialysis and fluorescence spectroscopy. The fraction of amiodarone bound to plasma protein amounted to 96.3%. The changes in the binding properties of 1-anilino-naphthalene-8-sulfonate for bovine serum albumin using warfarin and amiodarone as independent inhibitors were analyzed in terms of binding site specificity. The findings indicated that amiodarone and warfarin have two different binding sites on bovine serum albumin, so a noncompetitive inhibition mechanism was indicated. On the basis of our data we cannot exclude other mechanisms of interaction besides direct displacement of one drug by another; nevertheless, metabolite interference between amiodarone and coagulation cofactors may better explain the enhancement of warfarin's pharmacological action in association with amiodarone.This work was partially funded by the CNR (National Research Council, Rome, Italy), Program on Clinical Pharmacology and Rare Diseases. The authors would like to thanks Drs E. Marzi and E. riva for their help.     

Adrenocortical metabolism and plasma corticosterone in soman intoxicated rabbits

Summary The organophosphate neurotoxin soman produced impairments in adrenocortical RNA and protein metabolism. Fasciculate and reticular cell RNA and protein contents were supporessed with sublethal to acutely lethal dosages (20, 30 and 40 g/kg, s.c.) during the acute excitatory phase of intoxication and at 6–8 h post injection. All three dosages produced ca 90% inactivation of plasma cholinesterase. A transient elevation of plasma corticosterone occurred with 20 g/kg soman whereas there was a protracted increase with 30 g/kg. Corticosterone was not significantly elevated with 40 g/kg, but death occurred at 13±4 min. Thus, the magnitude and/or nature of soman-induced metabolic impairments does not appear to prevent adrenal activation.Supported by US Army Medical Research and Development Command Contract DAMD 17-81-C-1202.     

Non-host-selective fungal phytotoxins: Biochemical aspects of their mode of action

During the last decade increasing attention has been directed towards the biochemical mechanisms responsible for the biological activity of phytotoxins. Studies on the mode of action of some non-host-selective phytotoxins, some following on from previous observations, have demonstrated a very specific interaction with particular components of the cell machinery, and have suggested the possible use of these phytotoxins as tools for the investigation of important biochemical processes. This review article reports and discusses results of studies carried out in the 1980s with seven non-host-selective fungal toxins: brefeldin A, cercosporin,Cercospora beticola toxin, fusicoccin, ophiobolins, tentoxin, and zinniol. Each of these interferes with the life of the host by interacting with a different biochemical target.     

常压射流等离子体处理PET膜诱导自由基研究

为了考察常压射流等离子体(APPJ)处理对PET膜表面诱导自由基及其引发接枝共聚反应的效能,采用电子自旋共振技术(ESR)对APPJ处理前后PET膜表面生成的自由基及其衰变行为进行测试分析,并与接枝率测试结果进行对比。结果表明:纯He气体的APPJ处理更易引发PET膜表面生成自由基,处理时间越长,膜表面自由基浓度越高,自由基产物的稳定性受存储条件影响显著,自由基浓度越高的样品对应的接枝率也越高。     

Leakage of mantle helium from the Liaodong Peninsula, China

The isotopic cumpositions of helium have been investigated in hot spring gases sampled from the Liaodong Peninsula. China. The³He/⁴He ratios range from 0.14 Ra (0.14 times the atmospheric³He/⁴He ratio of 1.40 × 10^-6 to 0.72 Ra.³He/⁴He versus⁴He/²⁰Ne ratios and He contents suggest that a small amount of mantle-derived helium reaches the earth’s surface. Helium iwtope ratios of the hot spring gases show a distribution pattern similar to the regional heat flow values, indicating that the positive thermal anomaly occurring in the rtrea is closely associated with the presence of mantle-derived helium. The observations described above provide some significant evidence that the molten magma originating from partial melting of the upper mantle may have intruded into the continental crust along the activity fault. The coupling of the presence of mantle He and heat flow anomalies to seismic activity in studied region seem to imply that there is an internal relationship between mantle degassing and seismic activity.     

应用区间套法求解填充丝加热状态方程

热丝填充埋弧焊是在传统埋弧焊基础上发展起来的一种优质,高效,节能的焊接新工艺,在该工艺中,填充丝的加热状态十分重要,本文介绍了应用区间套法求解填充丝加热状态方程的思路,并给出计算结果和应用实例。     

稀土元素(镝、钬、铒、铥、镱、镥、钇和钪)高分辨率ICP光谱谱线表与光谱图的编制

讨论并建立了高分辨率光谱仪参数,在带宽为3pm的光谱条件下摄取了稀土元素的高分辨率等离子发射光谱（ICP）,鉴定了在240～450um波长范围内的谱线,和估测了这些谱线的强度．在实验中也观测到了谱线复杂的物理轮廓,包括超精细结构和未完全分辨的定线轮廓．     

两流方式下薄板坯连铸连轧生产组织方法及仿真

针对薄板坯连铸连轧两流供料方式下生产组织中出现的新问题,提出两种生产计划组织方式,建立模型进行仿真分析.根据仿真分析结果对薄板坯连铸连轧的生产组织方式选择提出建议.