非线性力学国家重点实验室2007年科研进展

近年来，非线性力学国家重点实验室（LNM）在坚持固体与流体的非线性力学行为和规律的学术方向下，突出了多尺度力学和跨尺度关联的研究．这既与国际上近年来出现的对多时空尺度演化和斑图的非线性科学问题的重视相互呼应，又反映了LNM在科学前沿和重大需求的交叉点上长期探索所形成的发展特点．实际上，多个时间／空间尺度非线性耦合的行为，是非线性复杂系统中至今尚未阐明的一个关键科学问题．

Bibliometric analysis of biological invasions research during the period of 1991 to 2007

The objective of this study is to conduct a bibliometric analysis of all biological invasions-related publications in the Science Citation Index (SCI) from 1991 to 2007. The indicator citation per publication (CPP) was used to evaluate the impact of articles, journals, and institutions. In the 3323 articles published in 521 journals, 7261 authors from 1905 institutions of 100 countries participated. As the most productive country of biological invasions research, the US will benefit from more collaboration between institutions, countries, and continents. In addition, analysis of keywords was applied to reveal research trends.

Bibliometric analysis of nicotine research in China during the period of 1991 to 2007

With the widespread exposure of people to nicotine through recreational use of tobacco products, research into nicotine has attracted increasing attention. Tobacco smoking is by far the most important cause of lung cancer. As the world's largest producer and consumer of tobacco products, China bears a large proportion of the global burden of smoking-related disease; therefore, information on nicotine publications should be collected to formulate future research policy. In the present study, we investigated nicotine-related research articles published by Chinese authors that were indexed in the Science Citation Index (SCI) from 1991 to 2007. An indicator "citations per publication" (CPP) was used in the study to evaluate the impact of journals, articles, and institutes. The quantity of publications has increased at a quicker pace than the worldwide trend. Article visibility, measured as the frequency of being cited, also increased during the period. However, the overall quality of articles, based on the impact factor of journals publishing those articles, dropped behind the worldwide average level. There has been an increase in international collaboration, mainly with researchers in the USA. The average CPP of international co-authorship articles was higher than that of single country publications. Besides the USA, nicotine research in China will benefit from more collaboration with Taiwan, England, and Germany. Some 110 of 264 articles were published by a single institute, and the top six institutes were compared from various angles. Seventy-two subject categories were covered, and trends (in terms of both quantity and quality) of nicotine research in China were compared with worldwide trends. In addition, analysis of keywords in both nicotine and lung cancer research fields was applied to indicate research interests. Mutual cooperation among multiple disciplines needs further strengthening.

HIRFL-CSR commissioning in 2006 and 2007

HIRFL-CSR, a new heavy ion cooler-storage-ring system at IMP, had been in commissioning since the beginning of 2006. In the two years of 2006 and 2007 the CSR commissioning was finished, including the stripping injection (STI), electron-cooling with hollow electron beam, C-beam stacking with the combination of STI and e-cooling, the wide energy-range synchrotron ramping from 7 MeV/u to 1000 MeV/u by changing the RF harmonic-number at mid-energy, the multiple multi-turn injection (MMI), the beam accumulation with MMI and e-cooling for heavy-ion beams of Ar, Kr and Xe, the fast extraction from CSRm and single-turn injection to CSRe, beam stacking in CSRe and the RIBs mass-spectrometer test with the isochronous mode in CSRe by using the time-of-flight method.

2007年辽宁省特大暴风雪形成过程与危害

2007年3月初辽宁发生了有气象记录以来最大的暴风雪灾害。在对2007年3月3—5日辽宁特大暴风雪和寒潮天气全面调查的基础上,系统分析了这次天气的强度、时空分布、形成过程和造成的危害。结果表明:本次暴风雪在辽宁省绝大部分地区出现了强降雪、降温及大风的天气特征,其中48h内全省平均积雪达20cm以上,最大降水量达106mm;最大风速为32m.s-1;主要的天气过程是500hPa高空槽、850hPa急流和切变及地面气旋的共同作用所致。这次特大暴风雪灾害给全省各行业造成了极大的经济损失。针对这场灾害的特点,提出了减轻和应对类似暴风雪灾害的建议和相应措施。