Improved spatial resolution in soil moisture retrieval at arid mining area using apparent thermal inertia

A surface soil moisture model with improved spatial resolution was developed using remotely sensed apparent thermal inertia (ATI). The model integrates the surface temperature derived from TM/ETM+ image and the mean surface temperature from MODIS images to improve the spatial resolution of soil temperature difference based on the heat conduction equation, which is necessary to calculate the ATI. Consequently, the spatial resolution of ATI and SMC can be enhanced from 1 km to 120 m (TM) or 60 m (ETM+). Moreover, the enhanced ATI has a much stronger correlation coefficient (R²) with SMC (0.789) than the surface reflectance (0.108) or the ATI derived only from MODIS images (0.264). Based on the regression statistics of the field SMC measurement and enhanced ATI, a linear regression model with an RMS error of 1.90% was found.     

北京市地埋管地源热泵项目应用效果评价分析

通过对27个北京市地埋管地源热泵项目应用数据的监测调查，从系统性能、地温变化、节能效益、环保效益和节能成本等方面进行统计分析，并应用主成分分析法和数据包络分析法对项目的效率进行综合评价，得出效率相对有效的项目17个，相对无效的项目10个，并分析无效项目的参数改进方向。最后提出地埋管地源热泵发展的4点建议：1）增加财政补贴可有效提高项目的投入产出效率；2）项目参数设计的合理性和运维管理的科学性是决定项目效率的根本因素；3）加强长期监测才能对地源热泵技术对环境影响程度有更准确的判断；4）优化项目投入产出效率是地埋管地源热泵项目普遍应用需要解决的重要问题。     

李闻雷黑陶作品欣赏

<正>~~     

高职高专计算机应用基础以证代考模式研究

随着我国社会主义现代化建设的发展,信息化、办公管理现代化的要求愈来愈迫切,作为现代化管理的重要手段—计算机应用已深入各领域、各行业、各部门。计算机知识的掌握和应用是高职高专学生服务社会的必备条件。由于信息技术的快速发展及高职高专的特点,本文针对我院多年来实践"以证代考"模式的实施方案、取得效果、存在问题几个方面进行阐述。     

Highly efficient VLSI architecture for DWT with low-storage implementation

With the gradual increase in image resolution of the spacecraft camera, it is highly required to figure out the problem how to process a huge amount of image data on board at a high speed. As a solution, the CCSDS proposes a space-oriented image-coding standard. For the sake of high image-coding performance, it adopts wavelet transformation as a method of image data transformation. However, wavelet transformation contains multi-level data processing, which causes more computational time consumption and more memory utilization. In order to solve this problem, we propose a highly efficient VLSI architecture for DWT with low-storage. By revising the traditional lifting structure and employing time-multiplex data processing strategy to perform the second and third level of wavelet transformation by the same logic module, the usage of logic resource is reduced with no sacrifice on speed.Using a small amount of on-chip memory instead of off-chip memory to save certain parts of DWT coefficients and sending the coefficients in a specific sequence to entropy coder timely, the off-chip memory for storage of DWT coefficients is no longer required. The proposed VLSI architecture of DWT is already implemented on the Xilinx FPGA XC4VSX55, which can achieve a high performance, in terms of data throughput, reaching 95.91MPixels/s.     

6063牌号铝合金内控标样研制及应用

本文从试验、定值及数据处理、有效性验证等几个方面详细阐述了6063牌号内控标样的研制及验证。该方法符合生产要求,大大降低成本,效果良好,可以推广应用。     

低渗砂岩油藏酸化解堵技术研究

介绍了低渗砂岩油藏堵塞原因,酸化解堵原理及常用的酸化解堵技术.酸化作为一种有效的增产措施在油田应用极为普遍,成功的酸化作业能够有效解除地层堵塞,恢复地层渗透率,一定程度的改变地层物性,从而达到提高采收率的目的.但是酸化作业时,作业不恰当也往往对地层产生不可逆的永久性二次伤害,大大的降低地层渗透率,严重时甚至导致油水井停产.本文通过对堵塞机理和影响砂岩酸化效果因素的研究确定了不同储层和不同伤害类型的酸化解堵工艺技术.     

粗制氢氧化镍羰基法提纯技术研究

红土镍矿湿法浸出产出的粗制氢氧化镍仅含镍40%左右,且含有钴、锰、铁、镁、钠等杂质元素,需进一步提纯才能满足市场要求。本文研究了氢氧化镍采用羰基气化冶金工艺生产高附加值羰基镍粉的可行性,通过小型试验和工业化试验,确定了技术路线和工艺参数。研究表明,粗制氢氧化镍经烘干焙烧、还原、活化、羰化和分解,所产的羰基镍粉纯度大于99.5%,能够满足市场要求,镍的直收率大于70%,残留在羰化渣中的镍和富集的锰、钴等有价金属,可作为湿法冶金的原料。     

循环冷却水最小流率目标值的确定

循环冷却水是工业用水系统中最重要的一种用水类型,其用量由过程系统的冷却需求决定.从系统的角度,分别探讨了如何用水夹点法和热夹点技术中的总复合曲线来确定循环冷却水流率的目标值,并对其间的差异进行了比较和分析,对于企业的节水工作有着重要的指导意义.用这两种方法对某装置的冷却水网络进行了分析,确定了不同情况下的冷却水的最小流...