Environmental dependence of stellar mass,SFR, and SSFR for the Luminous Red Galaxy (LRG) sample of the SDSS DR7

Using the Luminous Red Galaxy (LRG) sample of the Sloan Digital Sky Survey Data Release 7 (SDSS DR7), we investigate the environmental dependence of stellar mass, star formation rate (SFR) and specific star formation rate (SSFR) of LRGs. It is found that stellar mass of LRGs nearly is independent of local environments, and that the environmental dependence of SFR and SSFR in the LRG sample is much weaker than the one in the Main galaxy sample. One possible explanation is that galaxy color and morphology are a pair of galaxy properties most predictive of local environments, while LRGs are a group of galaxies that are likely to be luminous, red and of early types (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

基于二维模式的PDM与MRPⅡ无缝衔接可行性分析

ＣＩＭＳ工程的重要思想是将企业全部生产经营活动视为有机整体,可以集成与优化。但是,目前我国ＣＩＭＳ工程中ＰＤＭ与ＭＲＰⅡ分系统并未真正实现紧密结合与集成,甚至是彼此分离,无直接衔接。在实践经验的基础上,作者探讨了基于二维模式的ＰＤＭ与ＭＲＰⅡ紧密衔接可行性,提出了实现这一衔接的初步设想     

山东角07井注(漏)水诱发地震——地表宏观现象与震群活动特点

本文介绍了1985年底发生在山东胜利油田角07井的一次注水诱发型小震群的活动情况,论述了地表宏观现象,分析与讨论了这次诱发型震群的活动特点     

秦皇岛近岸海域绿藻微观繁殖体的分布以及在绿潮形成中的作用

2015年以来,秦皇岛近岸海域暴发了绿潮,对北戴河旅游区的环境和生态系统造成了严重影响。绿藻微观繁殖体在绿潮的形成过程中起到重要作用,主要包括孢子、配子、幼苗和营养片段。绿藻微观繁殖体作为绿潮的“种源”,其分布规律可以反映绿潮的“藻源”位置。本研究于2016年4-9月和2017年1月对秦皇岛近岸海域绿藻微观繁殖体的调查,探究了其分布规律以及生物量变化。结果显示,绿藻微观繁殖体主要分布在近岸海域,由近岸向远岸海域逐渐降低。绿藻微观繁殖体的数量在7、8月份最高,在冬季最低。受绿潮影响严重的海域微观繁殖体数量高于其它海域。秦皇岛近岸海域的绿藻微观繁殖体为该海域绿潮的种源,其分布规律表明秦皇岛近岸海域绿潮起源于本地。     

Experimental study on wide-shallow composite bucket foundation for offshore wind turbine under cyclic loading

As an appropriate type of foundation for offshore wind turbines (OWTs), wide-shallow composite bucket foundation (WSCBF) is cost-competitive, and it has a unique and special substructure that comprises seven internal rooms arranged in a honeycomb-like structure. In this study, the cyclic behavior of WSCBF for OWTs embedded in saturated clay was investigated using a large-scale model subjected to lateral cyclic loading. The responses of foundation under constant- and various-amplitude cyclic loadings were recorded in terms of displacements, rotations, and bending moments. The variations in stiffness and damping were obtained, and a collaborative bearing mechanical model between the bucket and soil was considered, which was beneficial for improving the stiffness of the whole structure. Accumulative deformation was found to have little effect on the bearing capacity of the foundation. Dynamic analysis in frequency domain was further performed on both moment and rotation data, and the complex, frequency-dependent impedance was also studied.     

Nitrogen fixation driven by mesoscale eddies and the Kuroshio Current in the northern South China Sea and the East China Sea

N₂ fixation rates(NFR, in terms of N) in the northern South China Sea(nSCS) and the East China Sea(ECS) were measured using the acetylene reduction assay in summer and winter, 2009. NFR of the surface water ranged from 1.14 nmol/(L·d) to 10.40 nmol/(L·d)(average at(4.89±3.46) nmol/(L·d), n=11) in summer and 0.74 nmol/(L·d) to 29.45 nmol/(L·d)(average at(7.81±8.50) nmol/(L·d), n=15) in winter. Significant spatio-temporal heterogeneity emerged in our study: the anticyclonic eddies(AE)(P...     

Relationships between typhoons,climate and crime rates in Taiwan

The literature indicates climate change is likely to cause more frequent and intense extreme weather events along with higher temperatures and altered precipitation. Taiwan frequently suffers from extremes in the form of typhoons, and their effects threaten both social stability and public security. Temperature effects through climate change are also expected to alter crime rates. We examine the immediate and longer-run impacts of typhoons and other climate variables on crime rates in Taiwan. The immediate results suggest that typhoon intensity has a significantly negative influence on rates of crime, including all violent crimes and automobile thefts. They also show that warmer temperatures have a strong positive effect on all violent crimes and all the subtypes of violent crimes. In addition, longer duration typhoons increase the immediate rates of all violent crimes, automobile thefts and muggings while decreasing the rate of burglaries. In the long run, we find that typhoon intensity, duration and landfall have persistent, lagged effects on crime that vary from negative to positive. For example, strong-intensity typhoons have significantly negative lagged effects on crimes 3–5 months in the future but positive lagged effects on crimes in future months 6–9. Finally, projections under the IPCC climate change scenarios show all violent crimes will increase.     

河南省栾川县红庄-元岭金矿床原生晕轴向分带特征及深部成矿远景评价

红庄-元岭金矿床位于豫西熊耳山金及多金属成矿带南亚带上,是近年来发现的中型金矿床。通过对该矿床地质特征、成晕元素共生组合及分带特征的研究,认为该区原生晕分带序列整体为正常序列,49号勘探线中存在前缘晕元素与近矿晕元素叠加共存的现象。地球化学参数反映了该区成矿具多期多阶段的特点,部分参数在深部有向高值转折的趋势,Au及近矿晕元素异常规模向深部具有增大趋势,表明深部有一定找矿潜力。结合原生晕轴向序列特征及地球化学参数、异常规模随深度的变化特征,认为浅部找矿的重点应放在海拔约400m以上,攻深找盲的重点应放在海拔300m以下。     

Trust-region based instantaneous optimal semi-active control of long-span spatially extended structures with MRF-04K damper

In the field of civil engineering, magnetorheological fluid （MRF） damper-based semi-active control systems have received considerable attention for use in protecting structures from natural hazards such as strong earthquakes and high winds. In this paper, the MRF damper-based semi-active control system is applied to a long-span spatially extended structure and its feasibility is discussed. Meanwhile, a _trust-region method based instantaneous optimal semi-active control algorithm （TIOC） is proposed to improve the performance of the semi-active control system in a multiple damper situation. The proposed TIOC describes the control process as a bounded constraint optimization problem, in which an optimal semi- active control force vector is solved by the trust-region method in every control step to minimize the structural responses. A numerical example of a railway station roof structure installed with MRF-04K dampers is presented. First, a modified Bouc- Wen model is utilized to describe the behavior of the selected MRF-04K damper. Then, two semi-active control systems, including the well-known clipped-optimal controller and the proposed TIOC controller, are considered. Based on the characteristics of the long-span spatially extended structure, the performance of the control system is evaluated under uniform earthquake excitation and travelling-wave excitation with different apparent velocities. The simulation results indicate that the MR fluid damper-based semi-active control systems have the potential to mitigate the responses of full-scale long-span spatially extended structures under earthquake hazards. The superiority of the proposed TIOC controller is demonstrated by comparing its control effectiveness with the clipped-optimal controller for several different cases.