摘要：The influence of the period of rotation on the effectiveness of the thermophotovoltaic （TPV） rotary regenerator was theoretically and experimentally investi- gated. It was found that the deviations of the theoretical results from the experimental ones decrease with the increase of the period of rotation. To the TPV system of 10 kW combustion power, the deviation is 3.5% when the rotation period is 3 s; while the deviation decreases to 1.5% when the rotation period increases to 15 s. The deviation could be mainly attributed to the cold and hot fluids carryover loss which was not considered in the model. With a new model taking account of the carryover loss established, the predicted results were greatly improved. Based on the modified model, the influence of geometrical parameters of rotary regenerator on the effectiveness was analyzed for TPV systems of various combustion power. The results demonstrate that the effectiveness increases with the increase of the rotary regenerator diameter and height, while fluid carryover loss increases at the same time, which weakens the impact of geometrical parameters.

摘要：The desired economics of hard rock surface mining is mainly determined by the parameters of process design which minimize the overall cost per tonne of the rock mined in drilling, blasting, handling and primary crushing in given rockmass conditions. The most effective parameters of process design could be established based on the regression models of the cumulative influence of rockmass and mine design parameters on the overall cost per tonne of the rock drilled, blasted, handled and crushed. These models could be developed from the huge data accumulated worldwide on the costs per tonne of hard rock surface mining in drilling, blasting, handling and primary crushing vs the parameters of rockmass and mine design. This paper only dwelt on the development of regression models for oversize generation, blasthole productivity and blasting cost for iron ore surface mines, whose data is available. The SPSS standard statistical correlation – regression analysis software was used in the analysis. Interpretation of the models generated shows that the individual effects of the determinant rockmass and blast design parameters on oversize generation, blasthole productivity and blasting cost are all in compliance with the findings of other researchers and the theory of explosive rock fragmentation and could be used for the estimation of oversize generation, blasthole productivity and blasting cost in rockmass and blast design conditions similar to those of the iron ore surface mines examined in this study. However, the regression models obtained here could not be used alone for the optimization of blast design because most of the determinant parameters also have conflicting effect on the other processes of drilling, handling and primary crushing the blasted rock. Also, the quality and content of the regression models could be enhanced further by increasing the content of rockmass and blast design parameters and the volume of data considered in the regression analysis.

摘要：The importance of decoding skills has long been neglected in L2 listening classes, especially in a Chinese EFL context. To help foreign language teachers and learners see the value of decoding skill instruction, a quasi-experimental study was designed to test the effectiveness of certain decoding skills in improving learners＇ general listening comprehension performance. Sixty non-English major freshmen were made the experimental group, and another 57 such students were made the control group. The intervention was 6-week-long explicit instruction of basic decoding skills, mainly based on the training framework proposed by Goh （2000）. Data was collected in pre-test, post-test and delayed post-test. The results of data analysis show that the performance of both groups improved in post-test and delayed post-test. However, the experimental group made significantly greater progress in both tests. This study shows that explicit instruction of decoding skills, together with well-designed skill training, contributes to learners＇ better understanding and control of the L2 listening processes and thus helps them improve their general comprehension performance. A series of recommendations for both L2 listening pedagogy and future research are also offered.

摘要：In order to obtain optimized flight vehicle concepts which meet system of systems （SOS） operation requirements, designers have to pay high attention to the impact of SoS at conceptual design stage since operation environment goes increasingly complex. Based on this tendency, per- spectives and progre,;ses of SoS oriented flight vehicle conceptual design, which is abbreviate as SoSed design, are reviewed in this paper. Such basic concepts of SoS as definition, characteristics, differences between systems engineering and SoS engineering, as well as SoSed design process are introduced, then SoS engineering process model for research and development of flight vehicles and SoSed design wheel model for conceptual design are proposed. Related literature is classified and analyzed in accordance with four major elements including requirements, design concept, design analysis, and trade studies and optimization： typical SoS architectures, description and quan- tization of indexes are introduced; Application of inverse design in designing concept is analyzed; Modeling and simulation （M＆S）-based methods and their applications in SoSed effectiveness evaluation are highlighted; According to SoSed trade studies and optimization related research, the importance of such points as decision-making and using multidisciplinary design optimization for reference are emphasized. Finally, the value of SoSed design is concluded, and five directions which are worthy of .attention in this field are presented.

摘要：A novel methodology for the formulation design of the multi-component cement additive for the low early strength blend cement was presented by using engineering *** of cement additive such as triethanolamine,chloride,saccharide and a kind of divalent alcohol were simultaneously tested according to the arrangement of response surface *** models were established to express the quantitative relationship between the chemical components of cement additive and the compressive strength of treated blend *** effectiveness and the possible interactions of these four chemicals contributing to the strength development of blend cement were further explored by the pareto chart and the contour *** according the performance analysis of four chemicals,the optimized formulations were brought forward and were validated in practical trials by Turkey＇s multiple comparison.

摘要：As a professional translator, Chinese history lecturer and academic writer, Julia Lovell has made a lot of contributions in translating modem Chinese literary works into English. But the field of translation studies has not given due attention to her so far. Based on her own practice and understanding of translation, she presented the notion of faithful recreation as her translation principle. This article sheds light on how she implemented her translation notion in the process of her translation, taking her version of A Dictionary of Maqiao as a case to examine the effectiveness of her work under the guidance of faithful recreation. The discussion mainly focuses on the sound level, the grammatical level, pragmatic level, and original creativity

摘要：The quality factor of class diagram is critical because it has significant influence on overall quality of the product, delivered finally. Testability has been recognized as a key factor to software quality. Estimating testability at design stage is a criterion of crucial significance for software designers to make the design more testable. Taking view of this fact, this paper identifies testability factors namely effectiveness and reusability and establishes the correlation among testability, effectiveness and reusability and justifies the correlation with the help of statistical measures. Moreover study developed metric based testability estimation model and developed model has been validated using experimental test. Subsequently, research integrates the empirical validation of the developed model for high level acceptance. Finally a hypothesis test performs by the two standards to test the significance of correlation.

摘要：目的为了探讨适合社区推广的出生缺陷综合干预模式,对北京市西城区开展的"健康生育快乐园"项目进行效果评估。方法采用类试验设计方法,在西城区7个街道,采用问卷的方法调查参加及未参加"快乐园"并已分娩的妇女1359人和1633人。比较两组人群孕前和孕期规避危险因素、采纳健康优生措施及不良妊娠结局发生的情况。结果参加"快乐园"的妇女孕前规避被动吸烟的比例及其丈夫规避吸烟的比例均显著高于未参加者;孕期规避被动吸烟的比例、孕早期服用叶酸的比例、孕前3个月服用叶酸的比例、孕期上孕妇学校的比例、早孕3个月建档比例和妊娠20周B超或唐氏筛查的比例均显著高于未参加者;未见两组人群不良妊娠结局的差异。结论 "健康生育快乐园"活动有效改善育龄夫妇孕前和孕期健康行为,为预防出生缺陷社区健康促进模式的建立提供依据。