Sphere-cone-polynomial special window with good aberration characteristic

Optical windows with external surfaces shaped to satisfy operational environment needs are known as special windows. A novel special window, a sphere-cone-polynomial (SCP) window, is proposed. The formulas of this window shape are given. An SCP MgF2 window with a fineness ratio of 1.33 is designed as an example. The field-of-regard (FOR) angle is ±75°. From the window system simulation results obtained with the calculated fluid dynamics (CFD) and optical design software, we find that compared to the conventional window forms, the SCP shape can not only introduce relatively less drag in the airflow, but also have the minimal effect on imaging. So the SCP window optical system can achieve a high image quality across a super wide FOR without adding extra aberration correctors. The tolerance analysis results show that the optical performance can be maintained with a reasonable fabricating tolerance to manufacturing errors.     

浅析珠算竞赛成绩的电脑统计

算盘、电脑有各自的功能，而利用电脑来统计珠算竞赛成绩将会收到意想不到的效果。下面就我们前两年的试验作一总结。     

全息激光显示技术助力新型显示创新突破

正为引导我国新型显示产业健康有序发展,国家发展改革委、工业和信息化部联合制定《2014-2016年新型显示产业创新发展行动计划》。计划里明确提到,到2016年,产能利用率保持合理水平,产品结构不断优化,行业资源环境效率显著提高,按面积计算出货量达到世界第二,全球市场占有率超过20%,产业总体规模超过3000亿元。这两年里需要全面掌握低温多晶硅(LTPS)/氧化物(Ox-     

Vibration Characteristics of Acoustically Levitated Object with Rigid and Elastic Reflectors

Levitation stability is a crucial factor that influences acoustic levitation capability. We present two sample-including models for a single-axis acoustic levitator with either a rigid or elastic reflector. Numerical analysis shows that, with the rigid reflector, both the decay time from initial disturbance and the vibration amplitude increase with sample density, which is unfavorable for levitation stability. However, with the elastic reflector, the decay time and the vibration amplitude are greatly reduced by choosing appropriate parameters of the reflector. Experimental results agree well with theoretical predictions, indicating that levitation stability can be remarkably enhanced by replacing the rigid reflector with an elastic reflector.     

引信的系统辨识及其失控模型

为了解决引信元器件及产品可靠性预测值与靶试可靠性估计值不相符的问题,引入引信系统辨识概念,建立了引信可靠性试验过程的系统辨识一般模型,元器件强度失控模型和参数失控模型,最后得出引信系统的综合可靠度。模型对可靠性的预测值与试验结果相吻合。     

Combined Influence of Off-diagonal System Tensors and Potential Valley Returning of Optimal Path

The two-dimensional barrier passage is studied in the framework of Langevin statistical reactive dynamics. The optimal incident angle for a particle diffusing in the dissipative non-orthogonal environment with various strengths of coupling between the two degrees of freedom is systematically calculated. The optimal diffusion path of the particle in a non-Ohmic damping system is revealed to have a probability to return to the potential valley under the combined influence of the off-diagonal system tensors.     

SOME PROPERTIES OF GALTON-WATSON BRANCHING PROCESSES IN VARYING ENVIRONMENTS

This article deals with some properties of Galton-Watson branching processes in varying environments. A necessary and suffcient condition for relative recurrent state is presented, and a series of ratio limit properties of the transition probabilities are showed.     

第六届国际环境催化大会(ICEC6,2010)

2010年9月12～15日北京中国科学院生态环境研究中心主办第六届国际环境催化大会(6th International Conference on Environmental Catalysis,ICEC6)将于2010年9月12~15日在北京召开.国际环境催化大会是环境催化领域的高学术水平会议,具有很高的国际知名度.该大会于1995年在意大利比萨首次举行,随后分别于1998年在美国迈阿密、2001年在日本东京、2005年在德国海德堡、2008年在英国贝尔法斯     

臭氧层的形成与破坏——环境化学模拟性实验设计

设计了一个臭氧层的形成与破坏模拟性实验.学生可以通过该实验掌握臭氧层的形成与破坏原理、臭氧浓度的简单测定方法,了解紫外线的特殊功能以及氯氟烃被紫外线分解和臭氧被氯氟烃分解的主要产物及其处理方法,加深对化学平衡的认识和理解.     

Magnetic microbubble:A biomedical platform co-constructed from magnetics and acoustics

Generation of magnetic micrbubbles and their basic magnetic and acoustic mechanism are reviewed. The ultrasound （US） and magnetic resonance （MR） dual imaging, the controlled therapeutic delivery, as well as theranostic multifunctions are all introduced based on recent research results. Some on-going research is also discussed.