Two types of dynamic cool coronal structures observed with STEREO and Hirtode

Solar coronal loops show significant plasma motions during their formation and eruption stages. Dynamic cool coronal structures, on the other hand, are often observed to propagate along coronal loops. We report on the discovery of two types of dynamic cool coronal structures, and characterize their fundamental properties. Using the EUV 304 A images from the Extreme UltraViolet Imager （EUVI） telescope on the Solar TErrestrial RElation Observatory （STEREO） and the Ca Ⅱ filtergrams from the Solar Optical Telescope （SOT） instrument on Hinode, we study the evolution of an EUV arch and the kinematics of cool coronal structures. The EUV 304A observations show that a missile-like plasmoid moves along an arch-shaped trajectory, with an average velocity of 31 km s^- 1. About three hours later, a plasma arch forms along the trajectory, subsequently the top part of the arch fades away and disappears; meanwhile the plasma belonging to the two legs of the arch flows downward to the arch＇s feet. During the arch formation and disappearance, SOT Ca Ⅱ images explore dynamic cool coronal structures beneath the arch. By tracking these structures, we classify them into two types. Type I is thread- like in shape and flows downward with a greater average velocity of 72 km s-l; finally it combines with a loop fibril at a chromospheric altitude. Type Ⅱ is shape-transformable and sometimes rolling as it flows downward with a smaller velocity of 37 km s-1, then disappears insularly in the chromosphere. It is suggested that the two types of structures are possibly controlled by different magnetic configurations.     

多波长线性回归--紫外分光光度法测定壳聚糖的脱乙酰度

以不同浓度的N-乙酰基-D-葡萄糖胺溶液在波长200,201,202,203nm处的吸光度值对波长作图得到线性关系良好的1组直线,其斜率与对应溶液的浓度成正比,线性范围为0.002 5～0.040 0mg/mL,回归方程为κ=-2.252 c-0.002 7,相关系数r=0.999 95(n=6).不同批号壳聚糖样品测定结果的相对标准偏差0.20%～0.52% (n=5),回收率在100.2%～101.6%之间.本法解决了单波长紫外分光光度法中共存物吸收干扰问题,并简化了紫外一阶导数法中导数值的求法.实验结果表明,该法测定壳聚糖的脱乙酰度准确度高,重现性好,试样无须特殊处理,适用于可溶性壳聚糖脱乙酰度的测定.     

Calculation of cloud modification factors for the horizontal plane eye damaging ultraviolet radiation

This research examines the influence of cloud on the cataract effective UV (UV_Cat) irradiances on a horizontal plane over an extended period of 12months that included the range of cloud conditions, solar zenith angle (SZA) and ozone conditions experienced over that time. The data were collected at five minute intervals. Cloud modification factors were determined from the influence of clouds on the global broadband solar radiation and these were applied to the cloud free cataract effective UV to evaluate the UV_Cat irradiances on a horizontal plane for all cloud conditions. A comparison of the measured and calculated UV_Cat irradiances for the 2004 data set in the range of SZA of 70° or less provided an R² value of 0.85. The data in the first 6months of 2005 for an SZA of 70° or less that were at a different time to that when the technique was developed provided an R² value of 0.83 for the comparison of the measured and calculated UV_Cat irradiances.     

紫外UV-B辐射增强对麦田蚜虫的影响

观测分析了大田条件下UV—B辐射增强对麦田中麦蚜的影响，结果表明UV—B辐射增强，蚜虫发生总量、小麦植株发生的百分率显著降低，蚜虫在穗部和植株上部叶片的发生概率下降，但蚜虫在叶片背光面发生数量增多，小麦植株的虫害发生概率降低。     

电子探针微区紫外阴极荧光分析系统及在沉积碎屑岩分析中的应用

在JCXA—733电子探针上采用一种实用的微区紫外一可见阴极荧光的探测方案，可以分析样品表面微区的不可见和可见的荧光．荧光的波长和强度特性与物质的成分、结构、缺陷，物质的形成条件、经历、所处环境条件等密切相关．相对于常规的可见阴极荧光测试技术，探测紫外和红外阴极荧光可以在更宽的波段上获取更多更新的样品内在信息．用此方法对河北唐山石英砂岩及其微小次生加大边进行阴极荧光分析，发现它们具有不同的紫外荧光特征，还有对应波长为287nm的辐射损伤色心，由此可以推测至少有两期胶结作用，且石英碎屑来源复杂．这为分析胶结作用期次和碎屑物物源提供了新的技术方法，对于沉积盆地分析和油气储集具有重要的实用意义．     

不同颜色翡翠的微量元素及红外光谱特征

不同颜色翡翠的能谱分析结果及紫外可见光谱特征表明；白色翡翠含有Fe,但Fe^3 不能使翡翠产生颜色；Mn可能是紫色翡翠的致色元素；蓝色翡翠较紫色翡翠含有S及较多的Ca、Fe、Mg和较少的Mn，Fe、Mg可使紫色翡翠带蓝色色调；灰绿色翡翠较绿色翡翠有较多的Ca、Fe、Mg和极少的Cr。同时，分析对比了不同颜色A货翡翠和优化处理翡翠的红外光谱特征。     

紫外线强度指数监测和控制系统

根据单片机原理和计算机通信技术，采用ATML89C51、ADC0809等芯片微控制器和集成电路、紫外辐射宽波段传感器，结合计算机串口通讯技术，设计出实用的紫外线强度指数监测和控制系统。该系统可自动采集紫外线强度指数数据，进行历史数据库的分析和查询，研究该地区紫外线强度的变化规律。     

Ground-Based UV Measurements of BrO and OClO over Ny-Ålesund during Winter 1996 and 1997 and Andøya during Winter 1998/99

Presented here are measurements of BrO and OClO performed by ground-based UV-visible zenith-sky viewing spectrometers developed by the Norwegian Institute for Air Research (NILU). Measurements were taken at Ny-Ålesund, Spitsbergen (79° N, 11° E), in winter and spring1996 and 1997 and at Andøya (69.3° N, 16° E) from summer 1998 until summer 1999. AM and PM differential slant column densities (DSCDs) at 90°SZA of BrO and OClO reached their maxima during polar vortex conditions in the winter months and were anti-correlated to temperature andNO₂. Comparison of BrO with a 3-D chemical transport model showed good agreement for seasonal trends and non-vortex conditions. BrO AM/PM ratios were underestimated by the model for vortex conditions, indicating the need for better quantification of BrO source and sink reaction rates. The detection of OClO above 200 K at the 475 K isentropic level indicates the possible activation of chlorine on sulphate particles. Several episodes of boundary layer ozone depletion due to marine-derived BrO were evident in our zenith-skyspectra during April 1997 in Ny-Ålesund.     

Feinauflösung von UV-Spektren durch Differentiation 1. und 2. Ordnung im Rahmen der Kohlenwasserstoffanalyse

Fine Resolution of UV Spectra by Differentiation of 1st and 2nd Order in Hydrocarbon Analysis Basic UV spectra (0th order) in unpolar solvents such as cyclohexane are useful — though with some reservations — in characterizing mineral oils occuring in pure form and aromatic fractions in environmental samples separated by chromatographic techniques. The common standard raffinates, biogenic hydrocarbons or other mixes of hydrocarbons including polycyclic aromatics can be approximately identified. The spectra of 1st and 2nd order improve the reliability of the results and permit above all to detect polycondensated aromatics even in traces. Finally, partial spectra of 1st and 2nd order in the wavelength ranges 205…240, 220…260, and 260…320 nm allow because of their very specific structures a simple and fast practically definite assignment to the above-mentioned groups of aromatics. Analogously, substituted aromatics in detergents and other technical products have already been identified. The method is suitable as a fast preliminary test, at least.