Search

The paper presents a success-oriented analysis technique for operational risk supervision in sea-borne nuclear power plants. The feasibility and acceptability evaluation of operational sequence is demonstrated through two hierarchical case studies: (1) high-level operational risk evaluation of an emergency operating procedure for small-break LOCA; (2) low-level reliability monitoring of an example residual heat removal system with due consideration of human actions. It shows that the success-oriented analysis technique is applicable for operational risk supervision and reliability monitoring of sequence of integration operator actions. Human error or system malfunction can be identified and avoided through reliability and performance-based pre-assessment and comparison.

Aiming at the time-consuming and labor-intensive problems of traditional electroscopes, a non-contact high-voltage electroscope was developed. This article uses the contact network as an example. First, the electric field simulation of the transmission line under Ansoft is performed. At the same time, the voltage and electric field strength changes under different conditions at 1m under the transmission line are analyzed to determine the test height of the high-voltage electroscope. A human substitution model is proposed, and the effect of humans on electric field distortion is analyzed. Secondly, the relationship between the induced voltage on the parallel plates and the distance test circuit of the parallel plates was deduced according to the principle of space capacitor voltage division, and the dimensions of each part of the high-voltage electroscope were initially determined to provide data references for subsequent electroscope designs.

In recent years, the measurement and controlment of the tiny gas flow have been gained widely attention in some emerging areas, such as biological, medical, aerospace and so on. In order to study the characteristics of the tiny gas flow meter, the tiny gas flow calibrator based on the principle of the Symmetric plunger is designed, which the flow range of the calibrator is from 5mL/h to 1000mL/h. The structure and the working principle are introduced, the uncertainty's Sources and classification of the tiny gas flow calibrator are analyzed, the uncertainty components are analyzed and calculated, The expanded uncertainty of the device is less than 0.126%, which conforms to the design requirements of the device, and it have reached the advanced level at home and abroad. Finally, according to the experiment of the soap film flowmeter, The expanded uncertainty of calibration for the soap film flowmeter is less than 0.77%.

To obtain a better knowledge regarding the influence of wastewater-irrigation on agriculture soils and food crops in Zhengzhou, five villages were selected and food crop samples were collected in 2009. The concentrations of seven metals of Cd, Pb, Zn, Cu, Cr, Hg and As were detected. Results showed that the concentrations of Cd, Hg, Zn and Pb in soil samples were a light buildup over the local background levels, and the ratios were 1.26, 1.16, 1.64 and 1.55 respectively, but still met the farmland environmental quality evaluation standards for edible agricultural products. Metal concentrations in food crops were under the permissible limits for food. The trend of bio accumulation factors in vegetables was in the order: Zn>;Cu>; Pb>; Cr, Cd, As and Hg; and in rice crops was Zn>;Cr>;Pb, Cu, Cd and As. All the hazard quotient values of adults and children were less than 1, which indicated that the consumption of food crops grown in wastewater-irrigation soils was nearly free of risks and generally assumed to be safe.

Injection moulding is a kind of highly automatic machine. The hydraulic system is an important part for its proper operation. But because of the frequent faults, the productivity of injection moulding is significantly decreased. Traditionally, the expert system for fault diagnosis is only based on expert experiences. However, considering the complexity of faults of the hydraulic system, it sometimes leads to inaccurate results, even no results. We present a method based on the combination of an expert's experiences and the object's structure and function. By using shallow and deep knowledge synthetically, the framework of an efficacious system is proposed. We describe the generalized knowledge base and the new diagnosis strategies and reference mechanism. We also give some practical rules in LISP language. In most cases, especially unexpected ones, this method can lead to better results.

Model JSG-1 laser velocity interferometer is introduced in this paper. The instrument design is based on the VISAR principle and employes some recent developed teckniques. Some improvements have also made in our device. It has some features: compactness in construction, simplicity for operation and reliability in behavior. As a versatile system with wide measuring range and dual sensitivity, it can be widely used in shock wave and ballistics research.