Diversity, Distribution Pattern and Conservation Status of the Plants Used in Liver Diseases/Ailments in Indian Himalayan Region

Introduction The Indian Himalayan Region (IHR) is known for its unique, natural, representative biodiversity (Samant et al. 1998a). This biodiversity is being utilized by the inhabitants of the IHR in various forms, i.e., medicine, food (wild edibles), fuel, fodder, timber, making agricultural tools, fiber, religious and various other purposes (Samant and Dhar 1997, Samant et al. 1998b). In the remote areas of the IHR where primary health centers are located far from the villages, the in…     

一个地面天文观测的远红外光度计

我们共同研制成功了一个适用于毫米波段大气窗口的红外光度计。它由锗—镓测辐射热计组成,工作温度在1.0K 输入量AW=0.3cm~2sr,而NET=1mk/Hz~(1/2)。两个金属的网格建立了两个窗,频率分别为10cm~(-1)和5cm~(-1)。我们的光度计的特点是:(1)灵敏度高到足以达到大气辐射的量子涨落的极限,但又特别简单易于控制。(2)我们的系统不需要使用外部的泵,因此,在望远镜的焦平面上易于操作。     

西纽芬兰阿巴拉契亚变形前锋构造

石油工业部门大量的海底多道地震资料表明：对阿巴拉楔亚阿卡德（Acadlian)变形前锋的经典解释并不准确。晚奥陶－志留纪末的Long Point-Clam Bank层系由于褶皱形成倾向北西的同斜层。而基底寒武－奥陶纪的地台型层系倾向南东。我们认为插入其间的区域为一“三角带”构造。它与其它逆冲带前陆边缘的情况类似。以前将Port au Port半岛上Long Point组与其下伏的Humber Arm异体系统间接触关系定为不整合，实际上是三角带倾向南东的上滑脱面。半岛上的地台型层系可能位于三角带内，为异地系统；阿卡德期（S－D）至少向北西移动30km。三角带向北东对海岛港湾的滨岸带，证明Long Range地块中的格林维尔（Grenvillian)基底也属异地系统。     

EL Centro Imperial County服务大厦的地震反应

本文针对加州El Centro Imperial County服务大厦进行了震后反应分析,此大厦在1979年10月15日Imperial Valley地震中受到严重的破坏,随后被拆除。分析中应用记录到的基底输入加速度和现代标准线性动力分析程序,结果表明,危险柱子上的力超过极限承载力,而可以预期的结果,主要是脆性受压破坏。地震时产生的侧力远远超过建筑规范规定的拟静力设计力。研究结果还表明,柱的破坏受到反应的三维性质的强烈影响,它导致危险柱子中的三轴弯曲。     

新发现7个X选 BL Lac天体和1个类星体(英文)

利用ROSAT－VLA方法筛选，从ROSATX射线源中选出了19个新BLLac天体和类星体的候选体．在1994年至1996年1月期间，利用北京天文台2．16m望远镜对其中16个进行光谱证认，发现了7个新的X选BLLac天体及一个类星体，类星体的红移值为：z＝0.331±0．0015．     

Some Experiments with Multivariate Objective Analysis Scheme of Heights and Winds Using Optimum Interpolation

A two-dimensional, multitvariate objective analysis scheme for simultaneous analysis of geopotential height and wind fields has been developed over Indian and adjoining region for use in numerical weather prediction. The height-height correlations calculated using daily data of four July months (1976-1979), are used to derive the other autocorrelations and cross-correlations assuming geostropic relationship. A Gaussian function is used to model the autocorrelation function. Since the scheme is multivariate the regression coefficients (weights) are matrix.Near the equator, the geostrophic approximation relating mass and wind is decoupled in a way similar to Bergman (1979). The objective analyses were made over Indian and adjoining region for 850, 700, 500, 300 and 200 hPa levels for the period from 4 July to 8 July 1979, 12 GMT. The analyses obtained using multivariate optimum interpolation scheme depict the synoptic situations satisfactorily. The analyses were also compared with the FGGE analyses (from     

Interstellar cyanomethane

We have made an observational study of the newly identified cyanomethane radical CH2CN and the possibly related species CH3CN with the goals of (1) elucidating the possible role of reactions of the type CnHm(+) + N in astrochemistry, and (2) providing a possible test of Bates's models of dissociative electron recombination. We find a remarkably different abundance ratio CH2CN/CH3CN in TMC-1 and Sgr B2, which we deduce is a result of the large difference in temperature of these objects. Studies of CH2CN and CH3CN in other sources, including two new detections of CH2CN, support this conclusion and are consistent with a monotonic increase in the CH2CN/CH3CN ratio with decreasing temperature over the range 10-120 K. This behavior may be explained by the destruction of CH2CN by reaction with O. If this reaction does not proceed, then CH2CN and CH3CN are concluded to form via different chemical pathways. Thus, they do not provide a test of Bates's conjectures (they do not both form from CH3CNH+). CH2CN is then likely to form via C2H4(+) + N --> CH2CNH+, thus demonstrating the viability of this important reaction in astrochemistry. The T dependence of the CH2CN/CH3CN ratio would then reflect the increasing rate of the C2H4(+) + N reaction with decreasing temperature.     

Processing of refractory meteorite inclusions (CAIs) in parent-body atmospheres

The refractory meteorite inclusions known as CAIs (calcium-aluminum rich inclusions) display melted rims that were produced by thermal events of only a few seconds duration. We show that gas dynamic deceleration in a temporary atmosphere around an accreting parent body, produced by gas release during accretion, could provide a regime of sufficiently high gas density and small scale height to achieve partial melting of the CAIs. In addition, the presence of dust in the atmosphere would increase the gradient of pressure with height (i.e., effectively reduce the scale height), lower the rate of blowoff (thus keeping more gas around the body), as well as allow dust particles to become trapped in the partially melted material as is observed in some cases. Thus, CAIs may be regarded as probes of a primitive atmosphere by virtue of the thermal and mineralogical alteration that occurred upon their passage through the atmosphere.