Observations of the total lunar eclipse on March 24, 1978, at 3.4-mm wavelength     

Yasuo Fukui  Shigeru Hata  Takeshi Miyaji  Yoshihiro Chikada 《Icarus》1979,40(2):309-314

Observations of the total lunar eclipse were made at 3.4-mm wavelength (87.4 GHz) on March 24, 1978. Eclipsr cooling curves with the best S/N ratio among those published thus far were obtained for the three points (the mountain area near the crater of Hipparuchus, Sinus Medii, and Copernicus). Each of the curves can be decomposed into the three parts which apparently correspond to ingress, totality, and egress. The derived cooling rate and heating rate differ significantly at the three points.  相似文献   

Role of Iron(III) and Aluminum Hydroxides in Concentration/reduction of Au(III) Complexes     

Akiko UCHIDA  Takushi YOKOYAMA  Yoshinobu MOTOMURA  Akane MIYAZAKI  Yoshihiro OKAUE  Koichiro WATANABE  Eiji IZAWA 《Resource Geology》2002,52(3):223-230

Abstract: The adsorption of gold on iron(III) and aluminum hydroxides from solutions containing Au(III) complexes has been studied as a function of pH and chloride concentration at 30C. Iron(III) hydroxide was more effective in adsorbing gold from solution than aluminum hydroxide. However, both hydroxides controlled the behavior of Au(III) complex with very similar manner. The most effective gold adsorption occurred in aqueous solution with near neutral pH and low Cl concentration. In this solution condition, Au(III) complexes were mainly dissolved as AuCl₂(OH)₂^- and AuCl(OH)₃^-, and the surface charge for both hydroxides was positive. In addition, the adsorbed Au(III) complexes were spontaneously reduced to elemental gold in spite of the absence of a specific reducing agent.
The results of this study suggest that adsorption and spontaneous reduction of gold complexes on the surface of hydrous metal oxides with positive charge play an important role in gold precipitation in subsurface environment.  相似文献   

Geographical and seasonal changes of the prey species of minke whale in the Northwestern Pacific   总被引：2，自引：0，他引：2  

Tamura  Tsutomu; Fujise  Yoshihiro 《ICES Journal of Marine Science》2002,59(3):516-528

  相似文献   

祁连山七一冰川物质平衡的最新观测结果   总被引：36，自引：16，他引：20  

蒲健辰  姚檀栋  段克勤  坂井亚规子  藤田耕史  松田好弘 《冰川冻土》2005,27(2):199-204

祁连山七一冰川观测结果表明, 2001/2002年度和 2002/2003 年度冰川物质平衡分别为-810mm和-316 mm水当量, 冰面出现显著的减薄状态. 和过去的观测结果相比较, 20 世纪 70 年代为较大的正平衡, 年平均为360 mm水当量; 80年代年平均为4 mm水当量, 基本接近零平衡状态. 到近两年亏损强烈, 为所有观测资料中负平衡值最大的年份, 零平衡线也达到最高位置. 物质平衡出现较大的负值和零平衡线位置升高的状况, 强烈反映了祁连山冰川对气候变暖过程的响应. 如果气候变暖趋势继续, 冰川物质平衡负值将增大、冰面减薄和雪线的升高, 冰川将继续呈现萎缩状态.  相似文献   

用X射线分析显微镜对海藻元素的研究Ⅱ.裙带菜孢子叶的元素定位     

严小军  陈予敏  范晓  忠田吉弘  永田忠博 《海洋科学集刊》2000,(42):182-188

X射线分析显微镜是一种快速的非破坏分析方法,可以用来对海藻中特定的元素在组织水平进行定位。本实验采用X射线分析显微镜对1997年2月在日本佐贺县唐津市海岸采集的养殖裙带菜(Undaria pinnatifida Suringar)的孢子叶进行了硫、钾、钙、碘的组织定位研究,对孢子叶的整体进行X射线扫描及特征元素次级荧光的图像分析,并选取孢子叶的边缘部、中部及中心各一点进行定点的X射线荧光光谱测定。Ⅹ射线荧光光谱的结果表明,钾是裙带菜孢子叶的最显著元素,具有最大的X射线荧光强度。定位分析表明,钾在孢子叶的中心部位分布较高,钙与碘则在边缘部分布较高,硫多位于孢子叶的中间部分,在中心部位及边缘部的分布均较低。除了钾、钙、硫以外,其他元素如铁、溴、锌也能够在X射线荧光光谱中给出谱峰。作者得到的X射线特征元素荧光图像首次报道了裙带菜孢子叶中钾、钙、硫等元素在组织水平的定位。应用RGB图像彩色合成技术获得的硫、钙、钾三元素的彩色合成图像也与定点分析结果相一致。  相似文献   

Altitudinal Distribution Of 20 Persistent Meteor Trains: Estimates Derived From Metro Campaign Archives     

Masa-Yuki Yamamoto  Masayuki Toda  Yoshihiro Higa  Kouji Maeda  Jun-Ichi Watanabe 《Earth, Moon, and Planets》2004,95(1-4):279-287

Observations of persistent meteor trains are limited because of the extreme rarity of the phenomenon. The altitudinal distribution of persistent trains has previously been investigated via limited instances of simultaneous observation from multiple sites, however, a statistical study of persistent trains has yet to be realized. The meteor train observation (METRO) campaign was established in Japan in 1998 to obtain images of persistent trains. From 1998 to 2002, the METRO campaign, involving Japanese amateur collaborators, captured more than 400 image sequences of persistent trains, resulting in 53 simultaneous multi-site observations. Several Japanese observers were involved in imaging persistent trains prior to the METRO campaign, producing 6 simultaneous observations over the period 1988–1997. In this paper, simultaneous multi-site observations of high spatial and temporal resolution are used to determine, via triangulation, the altitudinal distribution of persistent trains for 20 events. The altitudinal range of 2 Orionid trains was slightly higher than that of 18 Leonid trains. The Leonid train data reveal no clear dependence of upper and lower altitude on the brightness of the associated fireball. The upper altitude of the 18 observed Leonid trains were almost invariant with respect to local time (LT) of observation, however, a possible dependence of lower altitude on LT of observation was also found, indicating a near-constant penetrating path-length in the upper atmosphere for each train. The average upper altitude of persistent Leonid trains was 99.8 km, while the average central altitude was 93.0 km. These trends are probably determined by atmospheric conditions such as the abundance of O and O₃.  相似文献   

Impact of the winter North Atlantic Oscillation (NAO) on the Western Pacific (WP) pattern in the following winter through Arctic sea ice and ENSO: part I—observational evidence     

Oshika  Miki  Tachibana  Yoshihiro  Nakamura  Tetsu 《Climate Dynamics》2015,45(5-6):1355-1366

Climate Dynamics - On the basis of a 51-year statistical analysis of reanalysis data, we propose for the first time that the positive phase of the Western Pacific (WP) pattern in the winter is...  相似文献   

地壳表层砷的循环与污染地下水模式   总被引：1，自引：0，他引：1  

高存荣  冯翠娥  刘文波  赤井纯治  久保田喜裕  小林巌雄 《地球学报》2014,35(6):741-750

为了更好地监测和预测地下水砷污染,揭示由自然原因引起的地下水砷污染规律和机制,通过多年来对内蒙古河套平原地下水砷污染的调查研究,在充分了解和掌握砷的化学与地球化学性质以及世界各国地下水砷污染状况与分布特征的基础上,总结了砷在自然环境中的分布和污染地下水的机理。文章阐述了4种地下水砷污染类型的形成机理,并提出了地壳表层砷的循环与污染地下水模式,通过该模式在基本掌握某一地区地质环境背景的情况下,可以初步预测其可能发生地下水砷污染的地段。地下水砷污染是砷在地壳表层循环过程中发生的一种环境水文地球化学现象,污染区的分布与特定的地质、地理背景和环境条件有关。在还原解吸污染类型中,封闭的环境、硫元素和有机碳的存在是地层中砷溶出的主要控制因素。今后应加强对封闭的冲积或湖积平原、河流入湖或入海三角洲等地区地下水砷污染的调查与监测。  相似文献