Volume holographic storage and retrieval of digital data

A multiple page fully digital holographic data storage system is demonstrated. This system is used to store and retrieve digital image and compressed video data with a photorefractive crystal. Architecture issues related to spatio-rotational multiplexing and novel error-correcting encoding techniques used to achieve low bit-error rates are discussed.     

Hydrogen storage materials: properties and possibilities

The physics, chemistry, and possible applications of the storage of hydrogen in intermetallic reservoirs are discussed. Storage in the form of intermetallic hydrides can be safe and, where hydrogen has some special value as a fuel, economical. New pumps and refrigerators based on the heat of sorption of the hydrogen into the intermetallic are approaching commercial viability.     

基于激光雷达扫描的料仓原料储料量测量方法

为提高仓内原料储料量测量自动化和智能化水平,设计了一种基于二维激光雷达扫描的储料量测量装置与系统。本系统采用RPLIDAR S1型二维激光雷达扫描获取不同储料量物料的原始点云数据,通过坐标变换、重叠点提取、滤波、分割等方法对原始点云进行预处理,采用贪婪投影三角化算法将预处理后的点云进行三维重建,获得仓内原料的三维模型,结合物料三维模型和物料的容重获得仓内原料的储料量,从而实现储料量的自动测量。以玉米为试验对象,测量小型储料塔内玉米储料量并对玉米不同储料量进行扫描测量,验证模型的准确性,结果显示：测量结果的平均绝对误差为8.05 kg,平均相对误差为1.52%。研究结果表明,基于二维激光雷达扫描的储料量测量方法是可行的,具有较好的稳定性和测量精度,能够满足实际生产需求。     

Carbon nanotube-based nonvolatile random access memory for molecular computing

A concept for molecular electronics exploiting carbon nanotubes as both molecular device elements and molecular wires for reading and writing information was developed. Each device element is based on a suspended, crossed nanotube geometry that leads to bistable, electrostatically switchable ON/OFF states. The device elements are naturally addressable in large arrays by the carbon nanotube molecular wires making up the devices. These reversible, bistable device elements could be used to construct nonvolatile random access memory and logic function tables at an integration level approaching 10(12) elements per square centimeter and an element operation frequency in excess of 100 gigahertz. The viability of this concept is demonstrated by detailed calculations and by the experimental realization of a reversible, bistable nanotube-based bit.     

储气罐容积的计算

压缩空气系统所联接的储气罐有多种尺寸规格,但它的形状基本是一样的;过去对储气罐容积都近似地用圆柱体容积的计算公式来粗略计算,这样很不准确.本文经过分析、研究、推导的公式,能较准确地计算出的储气罐容积.     

海量农业科学数据存储体系架构与方法研究

为了解决应用传统数据库架构存储和管理分散而海量的农业数据存储能力不足和管理困难的问题,在Hadoop框架下研究了面向海量农业数据的分布式计算与存储技术,提出了基于Hadoop的相邻区域边缘化存储和混合式索引分布与检索技术。测试和实验结果证明,应用这种技术所构建的分布式存储系统,能很好地实现对海量农业数据的存储和管理。     

Single-crystal-like diffraction data from polycrystalline materials

A method for solving structures from powder diffraction data was developed, and its validity was demonstrated on three complex structures. The method uses a textured sample and exploits the high intensity and parallel nature of synchrotron radiation. In principle, crystal structures as complex as those routinely solved by single-crystal methods can be determined with this approach. For example, the as-synthesized form of the zeolite UTD-1, with 69 nonhydrogen atoms in the asymmetric unit, could be solved directly. With this method, a larger range of structural complexity becomes accessible to scientists interested in the structures of polycrystalline materials that cannot be grown as single crystals.     

中药材对抗同贮法研究进展

对中药材传统贮藏方法－对抗同贮法的理论依据和研究成果进行了综述，并展望了未来，中药材养护方法的发展趋势。     

高效液相色谱法测定烤烟非挥发性有机酸含量

采用高效液相色谱技术(HPLC)建立了一种同时快速测定烟叶中草酸、苹果酸、乳酸、柠檬酸、琥珀酸等非挥发性有机酸的方法。采用磷酸溶液,80 ℃水浴30 min,提取烟叶样品中的非挥发性有机酸,回收率可达到85.37%以上;采用Ultimate,AQ–C18 反相色谱柱,在215 nm波长下,以0.02 mol/L KH2PO4 溶液(pH3.0)和甲醇作为流动相,可较好地分离和测定初烤烟叶中的非挥发性有机酸含量,相对标准偏差为0.58%~1.99%,最低检出限为0.03~0.80 g/mL。     

多媒体数据的存储与检索技术

本文从多媒体数据的定义及组成入手,分析了目前常用的多媒体数据存储模型,并阐述了基于内容多媒体数据检索技术.     

基于相变储热材料的温室栽培架设计及性能研究

【目的】设计一种基于相变储热材料的温室栽培架,为解决温室作物冬季面临的低温冷害等问题提供参考。【方法】利用相变蓄放热系统、辅助加热系统、热风循环系统等组成栽培架,通过试验测试了典型晴天和典型阴天条件下栽培架种植区和相变蓄放热系统内的温度,对种植区与温室内的温度进行比较,并用FLIR红外成像仪采集线椒、番茄叶片部分的热红外图像,验证栽培架的放热保温效果。【结果】在典型晴天且不开启辅助加热条件下,种植区夜间平均温度较温室内高1.2～2.5 ℃;在典型阴天条件下,夜间开启辅助加热系统时,种植区夜间平均温度较温室内高3.3～6.8 ℃。在典型晴天和阴天两种天气条件下,栽培架内种植作物的叶片温度均高于同时段温室内种植的作物。栽培架的平均能量利用率在典型晴天和典型阴天条件下分别为65.1%和56.6%,栽培架的平均性能系数（COP）在典型晴天条件和典型阴天条件下分别为9.3和2.2。【结论】所设计的基于相变储热材料的温室栽培架冬季种植区增温明显,可有效改善作物生长的热环境,且节能效果明显。     

数据存储与高校数字化图书馆建设

文中对高等院校数字化图书馆存储策略进行分析和论述,并结合沈阳农业大学数字化图书馆建设的工作实践,为高校数字图书馆数据存储提出理论依据和实施方案.     

海量图形数据的存储与调度

采用基于三角形二叉树剖分方式的海量数据存储方式,并通过划分数据逻辑粒度进行海量数据高效调度的数据处理方法,使得图形数据的处理效率得到显著的提高.     

Aeration strategy for controlling grain storage based on simulation and on real data acquisition

In this work a new control strategy for grain aeration systems was proposed. This strategy was implemented in a software package called AERO and relates four conditions which depend on real time data acquisition and on the process simulation. The main advantage of AERO controller is that it can be used in different geographic regions, during different seasons and with different aeration systems, automatically adjusting its set points. The objectives of AERO controller are to equalize the temperatures inside the bin, to cool the grain mass whenever is possible and to maintain the moisture content under safe conditions. The results showed that the proposed strategy is efficient to achieve these objectives. Moreover, significant energy saving has been achieved with the AERO controller.     

低渗岩性气藏建设地下储气库工作气量的确定

储气库库容量与工作气量是储气库建设的核心问题,工作气量与储气库运行压力、垫底气量及注采井数等相互制约。对于榆林气田低渗岩性气藏储气库建设,储气库库容量评价与工作气量设计是研究重点和难点。分述了采用压降法、流动物质平衡法与产量不稳定分析法等计算动态储量的方法,评价了榆林气田南区储气库库容量,利用气藏工程方法确定储气库工作气量与库容量的比例为27.5%,利用气藏工程多参数优化与岩心注采仿真模拟实验相结合的方法确定储气库工作气量比例为25%～30%,综合以上结果,确定储气库工作气量为库容量的25%～30%。     

数据库大数据分布式存储技术研究

随着信息技术的不断发展,互联网用户的数量在不断的增加,数据量增长的速度也越来越快。在大数据时代,传统数据库和集中式存储技术在处理大数据时出现了处理效率低、处理速度慢等问题,无法满足现代信息数据处理的需要。大数据分布式存储技术是一种新型的数据存储技术,增强了数据库的数据处理能力,提高了数据库的数据处理效率,加快了数据库的数据处理速度,满足了大数据时代信息数据处理的需要。本文主要研究数据库大数据分布式存储技术,希望能为大数据存储技术研究提供一些借鉴。