一种计算设备空闲时间及工件等待时间的简便方法──表格计算法

本文以合理安排生产任务、提高设备利用率、缩短生产周期为目的，提出一种新的计算设备空闲时间及工件等待时间的简便方法，即表格计算法．该方法可以很容易地计算出各设备等待工件的空闲时间以及各工件等待设备的等待时间和工艺周期，为进一步编制更详细的生产调度计划提供可靠的依据．     

灰铸铁中初生奥氏体树枝晶二维金相切面与三维空间结构之间的关系

本文应用晶体几何学原理,对灰铸铁中初生奥氏体树枝晶进行了解剖研究,发现金相试样中复杂纷乱的枝晶二维切面是不同位向的树枝晶沿一定晶面切开的结果。利用树枝晶二维和三维空间结构之间的几何对应关系,可以比较方便、准确地对树枝晶的生长方式及形貌特征进行分析和计算。     

十二生肖习语翻译中直译、意译和借用法的运用

习语是语言词汇的重要组成部分,体现了深厚的民族文化的沉积。十二生肖习语更体现了东西方不同的民族特色。文章旨在讨论翻译十二生肖习语时应该采用哪种翻译法。动物形象和意义相似的习语宜采用直译法;貌似不同,仔细琢磨意思比较吻合的动物习语宜采用意译法;借以比喻之物相同,而其内涵相异者宜采用借用法。     

悬浮共聚合法制墨粉的新工艺与性能研究

研究了改进的悬浮共聚合法制备墨粉的工艺和性能,并和传统的混融法进行了对比.结果表明,改进的悬浮共聚合法制备的墨粉,具有工艺简单、广泛的调节范围、较窄分布的球形颗粒和熔融温度低等特点.可满足快速、高分辨率、节能等现代印刷技术的要求,使之有望成为新一代低成本墨粉的制备工艺.图6,参12.     

中硅钼球铁铸件材料的研制

介绍了铁合金蠕变热压定形耐热球墨铸铁模具铸件的铸造、熔炼和热处理工艺，探讨了它的形成机理。研制出的铸件满足了钛合金蠕变定形处理的要求。     

超细Co-γ-Fe_2O_3磁粉的研制

应用TEM、XPS、XRD等分析技术,研究了包钴过程中各种因素对钴改性γ-Fe_2O_3磁粉的微观结构以及磁性能的影响。结果表明,钴铁氧体的形成是Co-γ-Fe_2O_3磁粉磁性能提高的主要原因。包少量钴(钴含量<1%),可使原磁粉的矫顽力提高约6.37kA/m。     

Bacterial suicide through stress

Outside of the laboratory, bacterial cells are constantly exposed to stressful conditions, and an ability to resist those stresses is essential to their survival. However, the degree of stress required to bring about cell death varies with growth phase, amongst other parameters. Exponential phase cells are significantly more sensitive to stress than stationary phase ones, and a novel hypothesis has recently been advanced to explain this difference in sensitivity, the suicide response. Essentially, the suicide response predicts that rapidly growing and respiring bacterial cells will suffer growth arrest when subjected to relatively mild stresses, but their metabolism will continue: a burst of free-radical production results from this uncoupling of growth from metabolism, and it is this free-radical burst that is lethal to the cells, rather than the stress per se. The suicide response hypothesis unifies a variety of previously unrelated empirical observations, for instance induction of superoxide dismutase by heat shock, alkyl-hydroperoxide reductase by osmotic shock and catalase by ethanol shock. The suicide response also has major implications for current [food] processing methods. Received 29 March 1999; received after revision 14 May 1999; accepted 17 May 1999     

S-Nitrosylation of proteins

The transfer of a nitric oxide group to cysteine sulfhydryls on proteins, known as S-nitrosylation, is increasingly becoming recognized as a ubiquitous regulatory reaction comparable to phosphorylation. It represents a form of redox modulation in diverse tissues, including the brain. An increasing number of proteins have been found to undergo S-nitrosylation in vivo. These proteins are called S-nitrosothiols, and may play an important role in many processes ranging from signal transduction, DNA repair, host defense, and blood pressure control to ion channel regulation and neurotransmission. This review focuses on the importance of the S-nitrosylation reaction and describes some recently identified S-nitrosothiols in various fields of research.     

Age-related lipid peroxidation in the digestive gland of mussels: The role of the antioxidant defence systems

Summary The main cellular defence systems against free radical-mediated oxidative stress are significantly reduced in the dige⁺ive gland of aged (>10 years old) compared to younger (2–4 years old) mussels (Mytilus edulis L.). Moreover, the concentration of lipid peroxidation products (malondialdehyde) is increased in the same age group with respect to younger animals. The obtained data indicate that an impairment of the antioxidant defence systems would render the older animals more susceptible to peroxidative stress, thus supporting the general significance of the free radical theory of aging.