多层建筑结构水平剪扭-竖向地震反应的智能复合隔震控制

本文在提出了“碟形弹簧-橡胶隔震垫”和MR阻尼器组合而成的智能复合隔震系统的基础上，建立了智能复合隔震系统对多层建筑结构“水平剪扭-竖向”地震反应控制的设计计算方法。提出了智能复合隔震系统对建筑结构水平地震反应的模糊半主动控制策略和对建筑结构竖向地震反应的被动控制方法。以一个五层框架结构为例进行了仿真分析。分析结果表明，本文提出的智能复合隔震系统是一种十分简单和有效的隔震系统。它可克服建筑结构常规隔震系统的两个主要缺点，有效地抑制多层建筑结构的多维地震反应。     

A Review of Research and Development of Wind Energy in Turkey

During the end of the 20^th and the beginning of the 21^st centuries, interest has risen in new and renewable energy sources, and especially wind energy for electricity generation. In a short time, wind energy has been welcomed by society, industry and politicians as a clean, practical, economical and environmentally friendly alternative to existing fossil fuels. As a result of extensive studies on this topic, wind energy has recently been applied in various industries, and has started to compete with other energy resources. Wind energy applications and turbine installations at different scales have increased since the beginning of this millennium. Technically installed wind turbines capacity factors have high values in most areas of Turkey. It is seen that, in general, the modeling of wind speed and its parameters have been studied and researched rather than wind power technological development in Turkey. Wind investors had doubts about uncertainties in the renewable energy policies. After May 2007, an energy efficiency law was accepted and 10 years of electricity generation by renewable sources is considered as guaranteed by the Turkish government. The installed wind power has reached 131.35 MW in Turkey and it is expected that this value will be increased to 808.81 MW by the end of 2008. The dependence of strong technological and economical development on Turkey's energy needs have increased and new national or international sources have to be taken into account for the energy sector of the country. It is clear that this source gap could be filled by using the high potential of wind power, which is estimated at 58 GW. It is expected that installed wind power to supply up to 5% of electricity consumption by 2015 and for the end of 2008 this ratio will increase to 2% (it is currently ca. 1.0%). However, unexpected and unpredicted wind power applications have occurred on November 1^st, 2007 in Turkey. It has been announced that 78,000.00 MW wind power investments have been applied by the Energy Market Regulatory Authority (EMRA). This is a new era for the Turkish energy sector and there is no model for this new situation. Therefore, in this paper, wind energy in Turkey is reviewed and opened up for further discussion.     

2014年2月12日新疆于田Ms7．3地震序列应力降变化特征的初步研究

选取距离于田Ms7．3震中最近的于田地震台记录,利用所记录的震源区附近112次ML3．0以上事件的数字波形资料,采用Brune圆盘模型计算了此次地震序列的应力降值,得到该序列的应力降时序变化曲线。经初步分析后认为,于田Ms7．3地震序列的应力降时序变化特征基本符合前主余型地震序列特征。根据目前余震应力降值的发展趋势,估计该序列今后余震的强度会逐渐走低,再次发生中强以上余震的可能性不大。     

Using new remote sensing satellites for assessing water quality in a reservoir

Water quality monitoring could benefit from information derived from the newest generation of medium-resolution Earth observation satellites. The main objective of our study was to assess the suitability of both Landsat 8 and Sentinel-2A satellites for estimating and mapping of Secchi disk transparency (SDT), a common measurement of water clarity, in Cassaffousth Reservoir (Córdoba, Argentina). Ground observations and a dataset of four Landsat 8 and four Sentinel-2A images were used to create and validate models to estimate SDT in the reservoir. The selected algorithms were used to obtain graphic representations of water clarity. Slight differences were found between Landsat 8 and Sentinel-2 estimations. Thus, we demonstrated the suitability of both satellites for estimating and mapping water quality. This study highlights the importance of free and readily available satellite datasets in monitoring water quality, especially in countries where conventional monitoring programmes are either lacking or unsatisfactory.     

On a simple model for self-regulating star formation in the galactic disk

Sternentstehung in Galaxien ist ein Prozeß mit Rückkopplung zum interstellaren Medium (ISM) und möglicherweise ein Teil eines selbstregu-lierenden Zyklus. DOPITA (1985) hat ein Modell vorgeschlagen, in dem Sternentstehung in Spiral- und irregulären Galaxien über den Druck im ISM selbstregulierend wirkt. In der vorliegenden Arbeit wird gezeigt, daß die verfügbaren Daten für die radialen Verteilungen von Gas, Gesamtmasse und Lymankontinuumphotonenfluß in der Scheibe unserer Galaxis dieses einfache Modell nicht stützen. Verschiedene mögliche Ursachen werden diskutiert.     

X射线荧光光谱分析用的玻璃熔片与保存时间

Ｘ射线荧光分析用的Ｌｉ２Ｂ４Ｏ７玻璃熔片经长期放置后,Ｍｇ,Ｓｉ和Ａｌ等元素的Ｘ射线强度发生了很大变化,尤其是Ｍｇ的强度增大很多,以至无法进行准确分析,对于长期放置的熔片,可以用重新熔融的方法进行处理。     

The short timescale bursts of Cyg X-1 in the high and transitional states

Short timescale bursts or “shots” of Cyg X-1 in one ms time bins were obtained from PCA/RXTE observation. By superposing many shots lined up at the peak, a mean profile was obtained, and this was done seperately for the different states, high, transitional and low. The mean shot profile is different for the different states. The duration of shot is shorter in the high than in the transitional state. In both, the duration is about 0.11 s, which is shorter than in the low state. The profile is more asymmetrical in high than in low energy bands. In the transitional state, the average hardness during shots is lower than that of the steady component. The mechanism of shot generation is discussed.     

类新星食变星PG1030+590的光电测光

PG1030+590是最近发现的类新星食变星。我们首先给出该双星系统的高速光电测光结果及U、B、V和R光变曲线。通过利用激变变星的模型对观测结果进行分析,我们求得其物理和几何参数:白矮星子星质量M_1=0.83±0.22M_⊙,晚型星子星质量M_2=0.35±0.06M_⊙,晓型星子星半径R_2=0.37±0.08R_⊙以及轨道倾角i=81°±2°。我们还利用两种不同方法求出围绕白矮星的吸积盘的半径R_d≈0.32R_⊙,并把这个结果与密近双星中吸积盘半径的各理论模型进行了比较。     

Runaway instabilities in geometrically thin accretion disks around Kerr black holes

The stability of the innermost disk region orbiting a Kerr black hole is investigated for geometrically thin accretion disks. The infalling matter transports mass and angular momentum into the Kerr hole. This affects the inner disk boundary and leads to runaway instabilities in some cases.