基于土地出让视角的中国装备制造业发展态势

基于土地出让视角,构建产业发展驱动力评价体系综合测度2009~2013年全国装备制造业的发展态势,借助ESDA分析方法和空间计量模型分析装备制造业发展的空间特征及其影响因素。研究表明：① 全国装备制造业的总体发展格局与宏观经济发展格局基本一致,呈现由东部沿海向西北内陆逐步递减的态势;② 依赖用地规模扩张的产业驱动结构仍有待突破,东部应进一步强化产业结构分工和土地资源市场配置;③ 国家政策扶持是装备制造业驱动格局形成的重要推动因素,城市化发展、企业集聚水平和基础设施优势对其发展亦具有积极作用。     

探空、地面及卫星资料反演水汽含量的比较

利用探空、地面等常规探测资料及卫星遥感资料计算了我国中西部地区2007年6月—2008年5月间水汽含量的空间分布和时间演变,结果显示:由探空资料计算的整层大气水汽含量的空间变化,总体形势是,纬度低的地区水汽含量多,纬度高的地区水汽含量少;各探空站上空水汽分布的季节演变规律比较一致,夏季水汽含量最大,冬季最小,春秋季节基本相当。根据探空资料建立地面水汽压与大气总水汽量的经验关系,利用地面站资料确定水汽分布,与同时次探空站资料估算的水汽场相比,两者分布趋势基本一致。利用FY-2C卫星的可见光和红外分裂窗通道资料,建立反演大气水汽含量的回归关系式,与探空资料计算的结果相比,总体上变化趋势较一致。     

Dynamic Simulation of Pelagic Longline Retrieval

To improve fishing gear efficiency, it is important to understand the interactions among sea current, fishing vessel, line hauler, and catches during pelagic longline gear retrieval. In this study, fishing gear configuration parameters, operational parameters, and 3 D ocean current data were collected from Indian Ocean. Dynamic models of pelagic longline gear retrieval were built using the lumped mass method and solved using the Euler-Trapezoidal method. From the results, the pulling force of line hauler exerted on the gear was 2800–3600 N. There were no significant differences(P > 0.05) between the time of the hook retrieval measured at sea and that obtained from the simulation. The absolute values of the movement velocity at representative nodes along the X, Y, and Z axes were 0.01–25.5 m s^-1. These results suggest that the dynamic model of longline fishing gear retrieval can be used to analyze the interactions among sea current, fishing vessel, line hauler, longline gear, and catches, and to acquire the basic data for optimizing the design of the line hauler. Moreover, the model can serve as a reference to study the hydrodynamic performance of other fishing gears during the hauling process.     

基于文本分类的语义平滑在语言模型中的应用

平滑在语言模型的信息检索中很重要,它用来调整语言模型的参数使得所估算的参数更精确匹配语言模型。除了优化参数估计之外,一个必不可少的功能是避免语言模型中的未见项被赋予零概率。传统的平滑方法补偿词概率通常是使用一个背景集合词库,但是这样的补偿方法过于平均化而不能考虑上下文关系从而不能提高检索性能。提出了一种新的上下文相关语义平滑方法,这种新方法使用了文本分类技术。     

A review of: “National Transfer Format,Release 1.0, January, 1987.” By THE WORKING PARTY TO PRODUCE NATIONAL STANDARDS FOR THE TRANSFER OF NATIONAL DIGITAL MAP DATA. (Southampton: The NTF Secretariat,Ordnance Survey, 1987. [Pp. 191: appendices and looseleaf annex.]

Metonymically used location names (toponyms) refer to other, related entities and thus possess a meaning different from their literal, geographic sense. Metonymic uses are to be treated differently to improve the performance of geographic information retrieval (GIR). Statistics on toponym senses show that 75.06% of all location names are used in their literal sense, 17.05% are used metonymically, and 7.89% have a mixed sense. This article presents a method for disambiguating location names in texts between literal and metonymic senses, based on shallow features.

The evaluation of this method is two‐fold. First, we use a memory‐based learner (TiMBL) to train a classifier and determine standard evaluation measures such as F‐score and accuracy. The classifier achieved an F‐score of 0.842 and an accuracy of 0.846 for identifying toponym senses in a subset of the CoNLL (Conference on Natural Language Learning) data.

Second, we perform retrieval experiments based on the GeoCLEF data (newspaper article corpus and queries) from 2005 and 2006. We compare searching location names in a database index containing both their literal and metonymic senses with searching in an index containing their literal senses only. Evaluation results indicate that removing metonymic senses from the index yields a higher mean average precision (MAP) for GIR. In total, we observed a significant gain in MAP: an increase from 0.0704 to 0.0715 MAP for the GeoCLEF 2005 data, and an increase from 0.1944 to 0.2100 MAP for the GeoCLEF 2006 data.     

极地标本资源共享平台系统设计与实现

为了解决分布存储在全国各地的极地标本样品资源共享的问题,基于Python语言设计了具有数据发布、资源检索和申请审批等功能的极地标本资源共享平台信息系统,实现了极地标本样品的有效管理,目前已成功应用并对外服务。本文通过对系统重要功能模块的阐述介绍了系统设计与实现,最后对海量视频、查询推荐、图片检索、资源数据链等方面的问题进行了讨论。     

地震作用下室内设备半主动控制方法研究

为了有效地减小重要设备在地震荷载下的动力反应，本文采用可控粘滞流体阻尼器进行半主动控制。本文首先建立安装阻尼器的主体结构(设备系统)的动力方程，在此基础上以设备的相对位移和相对速度作为控制变量，提出了相应的半主动控制解法。数值分析表明，安装可控粘滞流体阻尼器后，设备的加速度和设备层的相对位移得到显著的减小。     

我国车载移动测量装备市场发展初探

车载移动测量技术和应用在国内迅速发展,本文介绍了国内外市场的主要车载移动测量产品,针对车载移动测量系统的核心部件及其主要性能,对我国车载移动测量装备市场发展现状和存在的突出问题进行初步研究,在此基础上提出了促进我国车载移动测量装备市场发展的几点建议。     

湘永地1井钻探施工技术

中扬子地区古生界页岩气基础地质调查湘永地1井钻探工程,终孔深度2224.69 m,全孔取心钻探、录井及测井。本文主要介绍了项目概况,钻井工程使用的主要钻井设备、录井设备及测井设备,湘永地1井岩心钻探工艺技术,针对钻探施工中遇到的孔内事故采取的技术措施及页岩气调查井钻探施工技术进行了探讨。