动力破碎分形和加载的关系

 应用由Grady和Kipp推广的Mott公式，导出了物体破碎碎块的分形公式，求出了分形维数，然后将此公式和加载及加载时间联系起来，阐明了分形维数的物理本质。     

格蕴涵代数中的扩张滤子

在格蕴涵代数中提出了扩张滤子的概念,讨论了扩张滤子与滤子,扩张滤子与素滤子,扩张滤子与滤子的根,扩张滤子与准素滤子,扩张滤子与最大滤子之间的关系.得到了扩张滤子的一些性质.最后,证明了在格H蕴涵代数中,扩张滤子与扩张滤子的根相等.     

Al_2O_3－SiO_2石油裂化催化剂上自由基空间分布的ESR成象

报道了用自己设计制作的电子自旋成象装置，对芳烃芳胺化合物在Ａｌ２Ｏ３－ＳｉＯ２催化剂表面酸中心所形成的正离子自由基进行二维ＥＳＲ成象研究．     

Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions

Hydrodynamic cavitation experiments in microfluidic systems have been performed with an aqueous solution of luminol as the working fluid. In order to identify where and how much reactive radical species are formed by the violent bubble collapse, the resulting chemiluminescent oxidation reaction of luminol was scrutinized downstream of a constriction in the microchannel. An original method was developed in order to map the intensity of chemiluminescence emitted from the micro-flow, allowing us to localize the region where radicals are produced. Time averaged void fraction measurements performed by laser induced fluorescence experiments were also used to determine the cavitation cloud position. The combination void fraction and chemiluminescence two-dimensional mapping demonstrated that the maximum chemiluminescent intensity area was found just downstream of the cavitation clouds. Furthermore, the radical yield can be obtained with our single photon counting technique. The maximum radical production rates of 1.2*10⁷ OH/s and radical production per processed liquid volume of 2.15*10¹⁰ HO/l were observed. The proposed technique allows for two-dimensional characterisation of radical production in the microfluidic flow and could be a quick, non-intrusive way to optimise hydrodynamic cavitation reactor design and operating parameters, leading to enhancements in wastewater treatments and other process intensifications.     

Collision site effect on the radiation dynamics of cytosine induced by proton

By combing the time-dependent density functional calculations for electrons with molecular dynamics simulations for ions (TDDFT-MD) nonadiabatically in real time, we investigate the microscopic mechanism of collisions between cytosine and low-energy protons with incident energy ranging from 150 eV to 1000 eV. To explore the effects of the collision site and the proton incident energy on irradiation processes of cytosine, two collision sites are specially considered, which are N and O both acting as the proton receptors when forming hydrogen bonds with guanine. Not only the energy loss and the scattering angle of the projectile but also the electronic and ionic degrees of freedom of the target are identified. It is found that the energy loss of proton increases linearly with the increase of the incident energy in both situations, which are 14.2% and 21.1% of the incident energy respectively. However, the scattering angles show different behaviors in these two situations when the incident kinetic energy increases. When proton collides with O, the scattering angle of proton is larger and the energy lost is more, while proton captures less electrons from O. The calculated fragment mass distribution shows the high counts of the fragment mass of 1, implying the production of H⁺ fragment ion from cytosine even for proton with the incident energy lower than keV. Furthermore, the calculated results show that N on cytosine is easier to be combined with low-energy protons to form NH bonds than O.     

Atomic structure and collision dynamics with highly charged ions

The research progresses on the investigations of atomic structure and collision dynamics with highly charged ions based on the heavy ion storage rings and electron ion beam traps in recent 20 years are reviewed. The structure part covers test of quantum electrodynamics and electron correlation in strong Coulomb field studied through dielectronic recombination spectroscopy and VUV/x-ray spectroscopy. The collision dynamics part includes charge exchange dynamics in ion-atom collisions mainly in Bohr velocity region, ion-induced fragmentation mechanisms of molecules, hydrogen-bound and van de Waals bound clusters, interference, and phase information observed in ion-atom/molecule collisions. With this achievements, two aspects of theoretical studies related to low energy and relativistic energy collisions are presented. The applications of data relevant to key atomic processes like dielectronic recombination and charge exchanges involving highly charged ions are discussed. At the end of this review, some future prospects of research related to highly charged ions are proposed.     

套代数中根理想的w*闭包

利用零化子的技巧,完全刻划了套代数中根Ｒ、ｒ的ω＊闭包,得到Ｒ＾Ｗ＊ｒ＝Ｈ＝（Ｒｒ∩Ｋ（Ｋ）＊＊,其中Ｒ＾Ｗ＊ｒ为Ｒｒ的Ｗ＊闭包,Ｋ＝｛Ｔ∈Ｒ（Ｋ）：Ｐ（Ｎ－）ＴＰ（Ｎ）＝０,Ａ↓Ｎ∈Ｎ｝;并且作为零化子和Ｒ＾Ｗ＊刻划的应用,给出了Ｒｒ中类Ｅｒｄｏｓ稠密性定理的一个新的证明和距离公式。     

140A MeV~(40,48)Ca和~(58,64)Ni炮弹碎裂反应产物的统计擦碎模型计算

用统计擦碎模型计算了140AMeV40,48Ca+9Be和58,64Ni+9Be弹核碎裂反应产物的截面.通过对碎片截面计算结果和实验测量结果的比较发现,采用自由空间的核子-核子反应截面计算时,对非中心反应产物的截面拟合很好,而对中心反应产物的截面有较大高估,而采用饱和密度相关的核子-核子反应截面计算时,对非周边反应产物的截面拟合较好,而对周边反应产物的截面有一定程度的低估.在统计擦碎模型中,对核子-核子反应截面进行细致的介质密度关联,可能会改进计算值与实验值的符合程度.     

Efficient sonochemical degradation of perfluorooctanoic acid using periodate

A rapid and efficient treatment method, using periodate (PI) for sonochemical oxidation of persistent and bioaccumulative perfluorooctanoic acid (PFOA) was developed. With an addition of 45 mM PI, 96.5% of PFOA was decomposed with a defluorination efficiency of 95.7% after 120 min of ultrasound (US). The removals of PFOA were augmented with an increase in PI doses. In all the PI + US experimental runs, decomposition efficiencies were essentially similar to those of defluorination, indicating that PFOA was decomposed and mineralized into fluoride ions. Lower solution pHs resulted in an increase in decomposition and defluorination efficiencies of PFOA due to acid-catalyzation. Dissolved oxygen increased the amount of IO₄ radicals produced, which consumed the more effective IO₃ radicals. Consequently, presence of oxygen inhibited the destruction of PFOA. The PFOA degradation rates with different gases sparging are in the following order: nitrogen > air > oxygen. Effects of anions follow the Hofmeister effects on PFOA degradation (i.e., Br⁻ > none ⩾ Cl⁻ > SO₄²⁻). Br⁻ could react with OH to yield radical anion Br₂⁻ that enhances the PFOA degradation. A reaction pathway was also proposed to describe the PI oxidation of PFOA under US irradiation.     

生境片段化对千岛湖次生马尾松林土壤理化性质的影响

土壤是森林生态系统的重要组成部分,对森林生物多样性和生态功能的维持具有不可替代的作用.据此,本研究以千岛湖地区大陆35个样方和29个不同大小和隔离度的陆桥岛屿次生马尾松林土壤为研究对象,分析了生境片段化对土壤理化性质的影响.研究发现,大陆马尾松林土壤厚度显著高于岛屿,而其土壤最大持水量显著低于岛屿;大陆土壤的全磷（P）显著低于岛屿,而土壤有效磷（AP）和硝态氮（NO₃-N）显著高于岛屿.在片段化的岛屿生境中,土壤C、N、P、NO₃-N、AP随与边缘距离的增大而降低;隔离度和地形对部分土壤理化因子有影响,而岛屿面积对土壤理化性质无影响.土壤理化因子和植物群落多样性存在显著相关性.生境片段化改变了千岛湖地区马尾松林的土壤条件,而边缘效应是影响片段化生境中土壤性质空间分布的主要过程之一.通过分析片段化景观中土壤理化性质的空间分布格局及其影响因素,深化了生境片段化对土壤条件影响的认识,对于片段化森林管理措施的制定具有重要意义.