抑制温州房价上涨的政策建议——基于同苏州的比较

为抑制或稳定房价，国家出台了一系列宏观调控和行政管制政策，但房价依然居高不下，且个别地区的房价上涨势头异常强劲。温州与苏州两地经济总量具有一定可比性，房价却存在较大差异。土地供给方面，苏州大大多于温州；政府行为方面，苏州拥有更多的政策优势；购房需求方面，温州购房主体的力量比苏州更为强大；房地产金融环境方面，温州比苏州更易于提供按揭。抑制温州房价的迅猛上涨势头，除了遵循国家各项政策，还应该考虑地区差异。采取适宜的措施。如增加建设用地和住房供给以满足需求；摆正政府位置，规范政府行为，防止政府沦为房地产行业的既得利益者；保护正常购房需求，抑制投机需求；加强金融监管，规范房产信贷，切断投机者的资金来源。     

中国现行征地制度由均衡到非均衡的原因及启示

随着经济体制改革的深入,中国征地制度逐步由均衡状态演变为非均衡状态。由于市场经济体制的确立,农地出现了交易机会并且价格不断升高,因此土地产权所有者产生了对现行的土地制度进行改革的要求;同样,由于计划经济体制被市场经济体制代替,实施征地制度的交易成本增加,因此政府也产生了征地制度供给变迁的要求。供需两方面的作用导致现行征地制度由均衡向非均衡的转变。据此,要改变现行制度不均衡的状态,关键是要逐步建立按照市场价格进行补偿的征地制度。     

月球探测器软着陆机构

综述了月球探测器软着陆机构的应用与发展现状。介绍了软着陆机构的性能要求和组成,并根据着陆腿结构和缓冲器种类对软着陆机构进行了分类。讨论了着陆器主体设计、着陆腿结构和缓冲器的模块化设计。阐述了着陆器发射、在轨飞行、着陆和着陆后阶段的动力学研究内容。分析了缓冲器设计、着陆机构基本构型设计,以及缓冲器与基本构型主要参数配置等关键技术,对月球探测器软着陆机构设计有一定的参考意义。     

小议元代书院及其发展背景

中国古代的书院是结合了藏书、教学及学术研究的古代教育机构。书院以聚书研修、讲学授徒的教育形式,对中国古代社会生活和文化教育的发展有着广泛影响。到了元代,由于其广博的开放性和兼容性及思想文化领域的宽松环境,书院的建设和发展有了一个广阔的空间,取得了长足进步,为元代及中国古代文化教育事业的发展发挥了很大的促进作用。     

一种自主式陆地导航系统的研究

为实现车辆在不依赖卫星定位的条件下能长时间、长距离、高精度导航,研究了一种激光陀螺捷联式惯导系统（LSINS）/里程仪/地理信息系统（GIS）陆地组合导航系统。在建立误差估计模型的基础上,充分利用GIS位置信息和可能出现的临时停车状态,提出了用GIS标定里程仪参数并修正方位角误差以及自动零速校准的方法。通过野外跑车试验,对系统的实时定位和定向精度进行了考核,证明上述方法可有效降低导航主要误差源的发散速度。     

直升机自转下滑训练过程发动机的控制规律

为确定直升机自转下滑训练过程发动机的控制规律,分析了采用正常控制规律进入自转状态时涡轴发动机的变化过程,提出了在现有控制规律基础上增强动力涡轮转速控制模块中总矩"提前器"作用和适当放宽速率限制值的控制对策.仿真结果表明,改进后的控制规律能够基本满足直升机对发动机状态控制的要求,为解决直升机发动机在自转训练情况下的控制问题提供了一条有效的技术途径.     

塔里木河中游地区水土资源生态安全评价

水土资源的安全程度和承载能力直接关系到区域的社会经济发展和生态系统安全,二者对生态格局的演变产生深刻的影响.以塔里木河中游地区的轮台县为例,从水土资源安全的角度出发,构建了研究区的生态安全评价指标体系,并且在GIS、RS和其他数据资料的支持下,对研究区1992-2008年16a间的生态安全状况进行了评价.研究认为：塔里木河中游地区的生态安全状况已由预警区转至中警区,生态环境整体上处于不断恶化的趋势.     

空客飞机主起舱门作动筒接头超声波检测

空客针对龙骨梁主起舱门作动筒接头有可能产生裂纹的问题下发服务通告,提出需要对主起舱门作动筒接头进行无损检测。本文介绍了采用超声波仪器进行此检测的操作方法,并对操作中遇到的一些难点进行具体分析。     

Land use/land cover classification using time series Landsat 8 images in a heavily urbanized area

It is of great significance to timely, accurately, and effectively monitor land use/cover in city regions for the reasonable development and utilization of urban land resources. The remotely sensed dynamic monitoring of Land use/land cover (LULC) in rapidly developing city regions has increasingly depended on remote-sensing data at high temporal and spatial resolutions. However, due to the influence of revisiting periods and weather, it is difficult to acquire enough time-series images with high quality at both high temporal and spatial resolution from the same sensor. In this paper we used the temporal-spatial fusion model ESTARFM (Enhanced Spatial and Temporal Adaptive Reflectance Fusion Model) to blend Landsat8 and MODIS data and obtain time-series Landsat8 images. Then, land cover information is extracted using an object-based classification method. In this study, the proposed method is validated by a case study of the Changsha City. The results show that the overall accuracy and Kappa coefficient were 94.38% and 0.88, respectively, and the user/producer accuracies of vegetation types were all over 85%. Our approach provides an accurate and efficient technical method for the effective extraction of land use/cover information in the highly heterogeneous regions.     

Sea level trend over Malaysian seas from multi-mission satellite altimetry and vertical land motion corrected tidal data

Rise in sea levels is one of the disastrous effects of climate change. A relatively small increase in sea level could affect natural coastal systems. In a study of long-term changes in sea level and measurements of postglacial rebound, monitoring vertical land motion (VLM) is of crucial interest. This study presents an approach to estimate precise sea level trends based on a combination of multi-sensor techniques in the Malaysian region over 19?years. In this study, satellite altimeters (SALT) were used to derive absolute sea levels (ASLs). Tide gauge (TG) stations along the coast of Malaysia were utilised to derive the rate of relative sea levels using sea level changes and VLMs. To obtain ASL at TGs, VLM at these stations were computed using Global Positioning System (GPS), Persistent Scatterer Interferometric Synthetic Aperture Radar (PS InSAR), and SALT minus TG. The computed VLMs mostly show similarities in signs rather than magnitude. The findings from the multi-sensor techniques showed that regional sea level trends ranged from 2.65?±?0.86?mm/yr to 6.03?±?0.79?mm/yr for chosen sub-areas, with an overall mean of 4.47?±?0.71?mm/yr and overall subsidence. This information is expected to be valuable for a wide variety of climatic applications and for studying environmental issues related to flooding and global warming in Malaysia.