基于可量测实景影像的空间服务研究

车载移动测量系统的发展促进了实景影像数据的广泛应用,但是数据标准和服务规范的缺失使异构的应用系统无法实现可量测实景影像数据和服务的共享,从而带来数据使用效率较低、互操作困难的问题,为解决这一问题,本文从充分分析实景影像数据的结构特征和功能特点出发,以Web服务体系为基础,结合OGC空间服务的相关规范,提出网络实景影像空间服务(Web Image Service,WIS),从接口设计、参数设计、交互过程、调用方式4个角度对WIS进行全面的研究,并对该服务模型进行原型实现和应用验证,探讨该服务模型在城市管理中的重要作用和意义.     

DMI标准的MIF到MIB转换器的研究与实现

在实现DMI与SNMP两种管理框架转换的过程中,最关键的问题是要完成这两个框架中,对于可管节点信息定义的转换,即将DMI中的MIF转换为SNMP中的MIB。DMTF根据这个需求制定了一套转换标准,但是实际应用中的工业标准和前者存在较大的差异。深入分析了这两套标准,探讨了如何实现一个通用的MIF到MIB的转换器,并给出了实现该转换器的优化模块设计图。     

Breeding goal traits accounting for feed intake capacity and roughage or concentrate intake separately

Current breeding tools aiming to improve feed efficiency use definitions based on total dry matter intake (DMI); for example, residual feed intake or feed saved. This research aimed to define alternative traits using existing data that differentiate between feed intake capacity and roughage or concentrate intake, and to investigate the phenotypic and genetic relationships among these traits. The data set contained 39,017 weekly milk yield, live weight, and DMI records of 3,164 cows. The 4 defined traits were as follows: (1) Feed intake capacity (FIC), defined as the difference between how much a cow ate and how much she was expected to eat based on diet satiety value and status of the cow (parity and lactation stage); (2) feed saved (FS), defined as the difference between the measured and the predicted DMI, based on the regression of DMI on milk components within experiment; (3) residual roughage intake (RRI), defined as the difference between the measured and the predicted roughage intake, based on the regression of roughage intake on milk components and concentrate intake within experiment; and (4) residual concentrate intake (RCI), defined as the difference between the measured and the predicted concentrate intake, based on the regression of concentrate intake on milk components and roughage intake within experiment. The phenotypic correlations were ?0.72 between FIC and FS, ?0.84 between FS and RRI, and ?0.53 between FS and RCI. Heritability of FIC, FS, RRI, and RCI were estimated to be 0.21, 0.12, 0.15, and 0.03, respectively. The genetic correlations were ?0.81 between FS and FIC, ?0.96 between FS and RRI, and ?0.25 between FS and RCI. Concentrate intake and RCI had low heritability. Genetic correlation between DMI and FIC was 0.98. Although the defined traits had moderate phenotypic correlations, the genetic correlations between DMI, FS, FIC, and RRI were above 0.79 (in absolute terms), suggesting that these traits are genetically similar. Therefore, selecting for FIC is expected to simply increase DMI and RRI, and there seems to be little advantage in separating concentrate and roughage intake in the genetic evaluation, because measured concentrate intake was determined by the feeding system in our data and not by the genetics of the cow.     

数字光纤通信系统DMI码编码器设计

研究了数字光纤通信系统中DM I码编码器的设计方法,设计采用分频器将20 MHz的时钟源分为32kHz和64 kHz的时钟频率;采用伪随机码产生器在32 kHz时钟频率作用下发生伪随机码(PN码),使DM I编码器将接收到的伪随机码进行编码,并在64 kHz时钟频率作用下输出DM I码。从而实现DM I编码,并获得了良好的仿真效果。     

THE VERTICAL THERMAL STRUCTURE OF THE INDIAN OCEAN DIPOLE MODE FROM WOCE DATA

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓｋｎｏｗｎｔｈａｔｔｈｅｔｒｏｐｉｃａｌｏｃｅａｎ ａｔｍｏｓｐｈｅｒｅｓｙｓｔｅｍｉｓｓｅｎｓｉｔｉｖｅｔｏｓｍａｌｌｆｌｕｃｔｕａｔｉｏｎｓｉｎｔｈｅｓｅａｓｕｒｆａｃｅｔｅｍｐｅｒａｔｕｒｅ (ＰａｌｍｅｒａｎｄＭａｎｓｆｉｅｌｄ ,1 986) .Ｔｈｉｓｓｅｎｓｉｔｉｖｉｔｙｓｔｅｍｓｆｏｒｍｔｈｅｓｉｍｉｌａｒｉｔｙｉｎｓｃａｌｅｓｏｆｍｏｔｉｏｎｂｅｔｗｅｅｎａｔｍｏｓｐｈｅｒｅａｎｄｏｃｅａｎｎｅａｒｔｈｅｅ ｑｕａｔｏｒ.Ｉｎｔｈｅｌａｓｔｔｗｏｄｅｃａｄ…     

基于DMI校验的PCI ROM保护算法

PCI ROM广泛存在于显卡、网卡、RAID卡、硬盘保护卡等PCI设备中。通过对PCI、SMBIOS、DMI规范和相关算法的研究,介绍了DMI的功用,探讨了DMI在BIOS中的位置及通过SMBIOS访问DMI的方式,说明了POST代码处理ROM的流程。针对PCI ROM保护的问题,提出了一种通过校验DMI来决定是否执行PCI ROM的方法。     

不同组分比的HMX/DMI共晶炸药结构与性质的理论研究

利用分子动力学,研究了分子摩尔比对HMX/DMI共晶炸药几个重要晶面成键能的影响,对于不同分子的摩尔比的力学性质也进行了估算,借助M06-2x/6-311+G(2df,2p)方法对HMX/DMI复合物的溶剂效应也进行了研究。计算结果表明,(020)和(100)取代基模型具有最高的成键能和稳定性,1∶1和2∶1的化合物最稳定且具有最高的力学性能。分子间相互作用能和N–NO_2键离解能的变化对HMX/DMI共晶炸药的稳定性有较大影响。制备稳定的HMX/DMI共晶炸药应选用较低介电常数作溶剂。     

1,3-二甲基-2-咪唑啉酮的合成工艺的研究

1,3-二甲基-2-咪唑啉酮是一种新型强极性非质子溶剂,可替代有致癌性的HMPA,性能优于普通惰性溶剂DMSO和DMF,有优良溶剂性能,对树脂材料、无机化合物、有机化合物、聚合物等都有很好的溶解,且稳定性好、低毒、高闪点、易于回收。该溶剂可以提高工业生产的安全性并减少对环境的污染,改善产品的质量,因此被称为"王牌溶剂"。本课题以水做溶剂和催化剂,尿素和乙二胺通过环化缩合制得2-咪唑啉酮;以甲酸做溶剂和甲基化试剂,对2-咪唑啉酮进行N-甲基化反应制得1,3-二甲基-2-咪唑啉酮。通过对回流时间、回流温度、原料配比的优化,最终获得一条适合我国化工制造水平、绿色、环保的DMI合成路线。     

Carcass fat partitioning and meat quality of Alentejana and Barrosã young bulls fed high or low maize silage diets

This study assessed the effect of breed and diet on carcass composition, particularly fat partitioning, and meat quality in young bulls. An experiment with forty young bulls from two phylogenetically distant Portuguese bovine breeds, Alentejana and Barrosã, fed two diets with different maize silage to concentrate ratios, but isoenergetic and isonitrogenous, was carried out until the animals reached 18 months of age. In the longissimus lumborum muscle, Barrosã bulls fed the low silage diet had the highest intramuscular fat (IMF) content. Bulls fed the low silage diet also had the highest IMF content in the semitendinosus muscle. Diet determined the proportions of total visceral fat and individual fat depots. Under these experimental conditions, it was shown that the genetic background is a major determinant of carcass composition and meat quality, and that the dietary differences studied had limited effect on carcass composition.     

Bitumen fluxing properties of a new class of sustainable solvents: The isosorbide di-alkyl ethers

The performances of new bio-sourced solvents, the short chain mono- and di-alkyl isosorbide ethers, have been determined and compared to benchmark bitumen fluxes. The influences of fluxes and temperature on the Newtonian viscosity have been assessed. The various fluxes appear to impact also on the visco-elastic behaviour of paving bitumen and dimethyl isosorbide ether (DMI) exhibits good fluxing properties. This bio-sourced solvent has also the property to be fully miscible with water. The bitumen hardness recovery can consequently occur from two different phenomena: evaporation and diffusion from the bitumen to water, making this solvent an appropriate bitumen flux for rainy seasons.