蝶阀加工及装配工艺的研究

传统工艺加工阀体、活门时，对机床的性能要求较高，一般为数控镗床。介绍了一种采用普通镗床加工阀体、活门的工艺方法及蝶阀在厂内装配的工艺方法。     

Integrating neural network technology and noise analysis

The integrated use of neural network and noise analysis technologies offers advantages not available by the use of either technology alone. The application of neural network technology to noise analysis offers an opportunity to expand the scope of problems where noise analysis is useful and unique ways in which the integration of these technologies can be used productively. The two-sensor technique, in which the responses of two sensors to an unknown driving source are related, is used to demonstration such integration. The relationship between power spectral densities (PSDs) of accelerometer signals is derived theoretically using noise analysis to demonstrate its uniqueness. This relationship is modeled from experimental data using a neural network when the system is working properly, and the actual PSD of one sensor is compared with the PSD of that sensor predicted by the neural network using the PSD of the other sensor as an input. A significant deviation between the actual and predicted PSDs indicate that system is changing (i.e., failing). Experiments carried out on check valves and bearings illustrate the usefulness of the methodology developed.     

低旋流进气直喷燃烧系统在195柴油机上的应用研究

介绍了低旋流进气直喷燃烧系统应用于１９５柴油机的试验结果，着重探讨了燃烧室结构尺寸和供油系统主要参数对柴油机性能和燃烧放热规律的影响。研究表明，这种燃烧系统应用于小缸径直喷柴油机具有良好的推广前景。     

引进型国产300MW汽轮机窜轴事故分析及防止对策

通过引进型国产300MW汽轮机在启动试运中出现的一次窜轴事故,根据计算机追忆打印的有关图表、数据分析了产生事故的原因,并提出了为防止类似事故重演应采取的措施和建议。经采取措施后该机组多次又在相同情况下启机,已安全运行。说明分析正确,措施得当,值得同类型机组借鉴。     

阀控式铅酸蓄电池的维护

对阀控式铅酸式蓄电池的维护工作进行了初步探讨。     

加强设备管理 防止阀门泄漏

分析了润滑油加氢装置阀门产生泄漏的原因，针对存在的问题，提出了防止阀门泄漏的方法，确保了装置“两年一修”的长周期安全运行。     

北京地区膳食摄入^232Th吸收入体液份额f1值的探讨

从北京地区公众成年人~(232)Th 的膳食日食入量,空气日吸入量,以及骨中~(232)Th 的沉积量出发,利用 ICRP 30号报告中参考人的代谢参数和内照射的库室模型,估算了北京地区公众成年人膳食摄入~(232)Th 后经胃肠道向体液转移份额 f_1值。结果表明,对于公众中成年人0.005是 f_1值的合适代表值,是 ICRP 30号报告推荐值 f_1=0.0002的25倍。虽然 ICRP 推荐值并不用于公众,但可以对群体有所了解;而北京地区从实测数据资料出发导出的 f_1值可能是更适于公众的。     

Aluminium content of Spanish infant formula

Levels of aluminium in 82 different infant formulae from nine different manufacturers in Spain were determined by acid-microwave digestion and graphite furnace atomic absorption spectrophotometry. The influence of aluminium content in tap water in reconstituted powder formulae was examined and an estimate was made of the theoretical toxic aluminium intake in comparison with the provisional tolerable weekly intake (PTWI). Possible interactions between aluminium and certain essential trace elements added to infant formulations have been studied according to the type or main protein-based infant formula. In general, the infant formulae contained a higher aluminium content than that found in human milk, especially in the case of soya, preterm or hydrolysed casein-based formulae. Standard formulae gave lower aluminium intakes amounting to about 4% PTWI. Specialized and preterm formulae resulted in a moderate intake (11-12 and 8-10% PTWI, respectively) and soya formulae contributed the highest intake (15% PTWI). Aluminium exposure from drinking water used for powder formula reconstitution was not considered a potential risk. In accordance with the present state of knowledge about aluminium toxicity, it seems prudent to call for continued efforts to standardize routine quality control and reduce aluminium levels in infant formula as well as to keep the aluminium concentration under 300 μg l^-1 for all infant formulae, most specifically those formulae for premature and low birth neonates.     

摇臂参数设计方法

建立了中小功率内燃机常用摇臂参数化设计模型。采用可变参数构成摇臂结构，并作结构的有限元网络，此后再进行有限元分析，计算出摇的质量、刚度、转动惯量 力。使摇臂的设计归结为几个主要参数的优选。实例分析表明，计算值和实测值基本相符，优选出的摇避设计优于原设计。     

用潜坝对抚州市南区水厂取水口淤沙进行治理

多沙河流中的水厂取水口，枯水期经常存在淤沙，影响抽水。以往的治理方法多是采用丁坝群束水冲沙，但坝田淤高有碍行洪，对城市防洪不利．南区水厂采用潜坝方案，兼顾防洪．通航等要求，缩小治理范围，用十分简易的方法获得成功，且投资更省，值得在类似工程中推广运用．