A Statistical Study of XBLs, RBLs and FSRQs at 1.5 GHz

BL Lac objects are similar to the fiat spectrum radio quasars in many aspects except regarding the emission lines.In order to study their relationship,we selected 56 BL Lacertae objects(33 X-ray-selected,23 radio-selected)and 45 flat spectrum radio quasars,analyzed their radio luminosities and core-dominance parameters.We found that the radio luminosities of the radio selected BL Lac objects located in between the X-ray selected BL Lac objects and the fiat spectrum radio quasars.However,this intermediate position does not bold for the core-dominance parameter:the RBLs have the largest core-dominance parameters.This sug- gests that the core-dominance parameter can not be taken as a sequencing criterion.We also investigated the correlation between the luminosity and the core-dominance parameter for the three subclasses.We concluded that,here,the sequence XBL-RBL—FSRQ still exists.     

大气科学类专业毕业生就业意向对气象部门人才招聘工作的启示

大气科学类专业毕业生是全国气象部门补充人才资源、建设气象人才梯队的主要来源。然而,随着气象事业发展的需求以及外部竞争的加剧,气象部门招聘大气科学类专业毕业生面临的压力持续增长。调查研究大气科学类专业毕业生的就业意向,对气象部门提高招聘工作效率和招聘质量有重要意义。     

高校学报在科技论文写作学科建设中的作用

高校学报服务于高校教学与科研的功能属性,决定了它与科技论文写作学科建设紧密关联。在科技论文写作学科建设中,学报编辑是理想的学术团队,可充当课程的骨干教师,学报可提供课程教学素材及学生写作实践平台。     

“SCIENCE” AND THE FUNDING OF HUMAN GEOGRAPHY

Misunderstanding of phenomenology and positivism as perspectives upon the philosophy and practice of science has important implications for the future of geographic research and research funding in America. Positivistic perspectives on the philosophy of science appear to be seen as fundable, whereas the scientific status and the possibilities for funding of phenomenological and other perspectives on the philosophy of science seem to be in question.     

Measuring the temporal instability of land change using the Flow matrix

This article introduces the Flow matrix, which expresses the sizes of transitions among categories between two time points. We use the Flow matrix to create a metric R that measures the instability of annual change among time intervals that partition the time extent. Specifically, R is the proportion of change that would need to be reallocated to different time interval(s) to achieve uniform change during the time extent. This article computes R for 10 Long Term Ecological Research (LTER) sites and for seven case studies from published land change data. Of the 10 LTER sites analyzed, the Andrews site in Oregon had the highest R value (37.1% of change), while the Luquillo site in Puerto Rico had the lowest (1.7% of change). We analyze the mathematical behavior of R, especially with respect to how the partitioning of the time extent into intervals can influence R.     

关于地震科技期刊特色建设的一点思考

本文依据从事地震科技期刊编辑工作实践，分析了编辑素质对地震科技期刊特色建设的影响和作用。     

工程地质学一个新的研究方向

本文认为，通过工程地质力学与系统科学的有机结合而形成的工程地质力学综合集成理论和方法，将成为当今工程地质学的重要研究方向之一。本文简述其基本原理、一般方法及实际工程应用等问题。     

地面核磁共振找水仪及其在水文地质调查工作中的应用研究

本文概要介绍了地面核磁共振找水方法的原理和世界上最新的直接探查地下水的仪器设备--地面核磁感应系统的特点,并以实例说明了NMR找水方法的应用效果,提出了关于提高NUMIS系统抗干扰能力、完善解释方法、研制系列仪器等方面的建议.