预氧化对多孔碳化硅陶瓷抗氧化及抗热震性的影响

考察了多孔碳化硅陶瓷的抗氧化性及抗热震性,探讨了不同制造工艺对多孔碳化硅陶瓷抗氧化性及抗热震性的影响。研究了SiC陶瓷在热处理过程中SiC颗粒表面氧化形成的SiO_2在不同热处理温度的状态变化及其对试样抗热震性的影响。     

Packing of Unequal Spheres and Automated Radiosurgical Treatment Planning

We study an optimization problem of packing unequal spheres into a three-dimensional (3D) bounded region in connection with radiosurgical treatment planning. Given an input (R, V, S, L), where R is a 3D bounded region, V a positive integer, S a multiset of spheres, and L a location constraint on spheres, we want to find a packing of R using the minimum number of spheres in S such that the covered volume is at least V; the location constraint L is satisfied; and the number of points on the boundary of R that are touched by spheres is maximized. Such a packing arrangement corresponds to an optimal radiosurgical treatment planning. Finding an optimal solution to the problem, however, is computationally intractable. In particular, we show that this optimization problem and several related problems are NP-hard. Hence, some form of approximations is needed. One approach is to consider a simplified problem under the assumption that spheres of arbitrary (integral) diameters are available with unlimited supply, and there are no location constraints. This approach has met with certain success in medical applications using a dynamic programming algorithm (Bourland and Wu, 1996; Wu, 1996). We propose in this paper an improvement to the algorithm that can greatly reduce its computation cost.     

Reliability Analysis for Hazardous Waste Treatment Processes

The reliability of a treatment process is addressed in terms of achieving a regulatory effluent concentration standard and the design safety factors associated with the treatment process. This methodology was then applied to two aqueous hazardous waste treatment processes: packed tower aeration and activated sludge (aerobic) biological treatment. The designs achieving 95 percent reliability were compared with those designs based on conventional practice to determine their patterns of conservatism. Scoping-level treatment costs were also related to reliability levels for these treatment processes. The results indicate that the reliability levels for the physical/chemical treatment process (packed tower aeration) based on the deterministic safety factors range from 80 percent to over 99 percent, whereas those for the biological treatment process range from near 0 percent to over 99 percent, depending on the compound evaluated. Increases in reliability per unit increase in treatment costs are most pronounced at lower reliability levels (less than about 80 percent) than at the higher reliability levels (greater than 90 percent, indicating a point of diminishing returns. Additional research focused on process parameters that presently contain large uncertainties may reduce those uncertainties, with attending increases in the reliability levels of the treatment processes.     

社会公正的基本原则探析

社会公正的基本原则是社会公正理论的核心,是社会公正观或公正内容的具体化和措施化,是人们衡量社会公正与否的具体标准。具体来说,社会公正的基本原则主要包括基本权利平等原则、共享原则、按贡献分配原则和补偿原则。     

浅议高职高专英语教学中的阅读与写作

本文倡导在高职高专英语教学过程中应将英语阅读与写作技能的培养结合起来,读写并重。     

Evaluating community-based treatment programmes for men who sexually abuse children

The currently dominant multi-factorial explanations of sex offending have been reflected in the widespread adoption of cognitive-behavioural groupwork methods where treatment foci are those attitudes, beliefs, cognitions and behaviours believed to contribute towards the maintenance of sexually abusive practices. Community-based programmes have mushroomed during this decade, with 97% of regional probation services now having provision for sex offender treatment. However, these relatively recent and dramatic developments of practice have to a large extent occurred outside of a framework of rigorous planning and evaluation. This article begins by outlining a rationale for both the treatment of sex offenders and evaluating programmes. This is followed by a framework for evaluation within which treatment providers can consider the issues involved (including the methodological difficulties) in setting up research designed to evaluate treatment effectiveness. It is suggested that, while small-scale (in-house) research may tell us something about the success or otherwise of individual programmes, it is the larger-scale projects carried out by independent researchers that will inform us as to the impact of cognitive-behavioural group work on recidivism and offence-related psychological variables. Such research has the potential to assist policy-makers and to aid managers and practitioners in the development of effective treatment programmes. © 1998 John Wiley & Sons, Ltd.     

明末清初的翻译活动与中西文化交流

明末清初的翻译活动在中西文化交流史上具有重要的意义。从翻译的内容和形式上看,体现了中西文化平等且平和的交流,其原因有很多,归根到底应归结为经济原因。这种翻译活动对于中西文化交流的影响是双向的。     

Are Methadone Counselors Properly Equipped to Meet the Palliative Care Needs of Older Adults in Methadone Maintenance Treatment? Implications for Training

Today's methadone patients differ greatly from those of the past. Because of the rise of polydrug use and the HIV and hepatitis epidemics, treatment has become much more complex, which multiply the concerns and complexities of treatment. Patients entering methadone programs are also more commonly presenting at ages well into their 50s, 60s, and 70s; and this phenomenon of high rates continues to grow. The majority of these individuals in treatment have presented with a number of significant comorbid medical conditions that will progress and eventually lead to death. This aging cohort must be approached with a modified treatment plan that focuses on management and promoting healthy aging, while attending to their maximum delay of illness, disease, and disability. This article argues that it is necessary for counselors working with this group to adopt a palliative care philosophy. This article also makes recommendations in areas that counselors need to be knowledgeable and skilled in to provide appropriate palliative services specific to this aging population with multiple needs as they near end of life.     

不确定性防范与城市务工人员主观幸福感：基于反事实框架的研究

本文基于2007年中国家庭收入调查数据,评估了不确定性防范对城市务工人员的影响,并获得了一些重要发现：(1)不同类型的不确定性防范措施对影响居民主观幸福感存在着显著差异,参与养老保险、失业保险和工伤保险能够显著提高城市务工人员主观幸福感,但参与医疗保险对城市务工人员主观幸福感没有显著影响;(2)四种不确定性防范手段对城市务工人员之间主观幸福感差异的总贡献率接近10%,其中参与失业保险的贡献率最大。进一步研究发现,城市务工人员主观幸福感变化符合享乐适应理论,即随着不确定性防范措施的逐步实施推广,城市务工人员的主观幸福感可能会返回到未采取不确定性防范措施前的水平。