面向Ruby on Rails的多类型RIA集成技术研究

通过对RIA的技术特点进行分析,采用HTTPService和REST风格接口,面向Ruby on Rails模式,设计了一种对多种类型富客户端进行功能调用的集成框架,在可以不断添加新型客户端功能调用的同时简化开发过程、改善用户体验,增强跨平台能力和可降解性.同时支持通用的HTML视图,获得很好的开发效率和效果.     

混凝土空心砌块力学性能研究进展

根据大量的研究成果,对目前混凝土空心砌块的力学性能研究作了详细的阐述和说明,主要包括:不同材料混凝土空心砌块的力学性能研究;不同孔型的混凝土空心砌块的力学性能分析;混凝土砌块墙体裂缝的力学机理探讨;对混凝土空心砌块的抗震性能、收缩、构造作了说明。分析了目前的研究现状、存在问题及混凝土空心砌块的研究方向和未来发展趋势。     

Efficient processing of enumerative set-based queries

Many applications often require finding sets of entities of interest that meet certain constraints. Such set-based queries (SQs) can be broadly classified into two types: optimization SQs that involve some optimization constraint and enumerative SQs that do not have any optimization constraint. While there has been much research on the evaluation of optimization SQs, there is very little work on the evaluation of enumerative SQs, which represent the most fundamental fragment of set-based queries. In this paper, we address the problem of evaluating enumerative SQs using RDBMS. While enumerative SQs can be expressed using SQL, existing relational engines, unfortunately, are not able to efficiently evaluate such queries due to their complexity. In this paper, we propose a novel evaluation approach for enumerative SQs. Our experimental results on PostgreSQL demonstrate that our proposed approach outperforms the conventional approach by up to three orders of magnitude.     

Influence of dynamic strain aging pre-treatment on the low-cycle fatigue behavior of modified 9Cr–1Mo steel

The influence of dynamic strain aging (DSA) pre-treatment on the low-cycle-fatigue (LCF) behavior of modified 9Cr–1Mo steel was investigated at 550 °C. The DSA pre-treatment reduces the fatigue life, which is reflected on the fracture surface as multiple crack initiation. The samples pre-treated by DSA have higher peak tensile stress and positive mean stress effects, which is responsible for the lifetime reduction. The DSA pre-treatment does not change cross-slip mechanisms during mechanical cycling, compared without DSA process, but results in accelerating the microstructure transformation from lath to cells with low dislocation densities, which reduces the number of cycles to failure.     

预防性子宫动脉栓塞在产科疾病中的应用

【摘要】 目的 探讨预防性子宫动脉栓塞在产科疾病中的应用价值。方法 收集2007年 1月—2012年7月瘢痕妊娠、宫颈妊娠及前置胎盘患者共17例（栓塞组）,在流产、刮宫术前行预防性双侧子宫动脉栓塞术,并与前期或同期行清宫及药流等其他方案治疗的瘢痕妊娠、宫颈妊娠及前置胎盘共15例患者（非栓塞组）比较治疗出血量、并发症、保宫率差异。结果 栓塞组17例介入手术全部成功,刮宫术中出血少,平均20 ml,无严重并发症发生,随访40 ～ 150 d后月经恢复正常。非栓塞组患者中出血量较多的有4例,其中3例切除子宫,2例发生与手术相关并发症。栓塞组与非栓塞组术中出血、并发症的发生及保宫率差异有统计学意义（P ＜ 0.01）。结论 预防性子宫动脉栓塞可减少瘢痕妊娠、宫颈妊娠及前置胎盘患者术中子宫出血、并发症发生,增加保宫率,是安全有效、疗效确切的治疗方法。
     

镁铝复配无卤阻燃剂对EVA/LDPE性能影响研究

以氢氧化镁(MH)和氢氧化铝(ATH)为无卤基材,结合硼酸锌、红磷和硅酮复配制备无卤阻燃剂。将阻燃剂进行改性后与EVA/LDPE共混制备新型无卤阻燃材料。通过正交试验法,研究不同配方无卤阻燃剂对材料的拉伸性能和阻燃性能的影响,进而获得最佳的复配阻燃剂配方。结果表明,在ATH和MH总量为60份的情况下,当MH∶ATH为5∶1,硼酸锌加入量20份,红磷加入量4份,硅酮用量为3份时,复配后无卤阻燃剂对EVA/LDPE的阻燃性能满足垂直燃烧等级UL-94V-0级,机械性能也较好。     

Mechanical Properties of Electrodeposited Nanocrystalline Nickel

In this paper, dense bulk nanocrystalline (nc) nickel electrodeposits with various grain sizes were produced by using high frequency pulse current and strong electrolyte flushing. The effects of the grain sizes on the mechanical properties were discussed for room and a medium temperature. It was found that the properties of the deposited nickel such as microhardness, corrosion resistance and yield stress (at room temperature and 473 K) were improved substantially with the decrease in the grain size. A deviation of yield stress from the Hall-Petch relationship for nc nickel was observed when the grain sizes were decreased to less than 70 nm at room temperature. A low yield stress value of nc nickel was obtained at a temperature of 673 K as a result of its thermodynamic instability.     

适用于智能电网的任意波形输出功率源

智能电网中数字化设备的性能校验对功率源的要求较高,目前常见的功率源只能输出单一的正弦信号,无法满足该类设备性能校验的多种需求。文章研制了一套基于大功率运放的高精度标准程控功率源,输出的三相电压电流幅值、相位、频率均独立可调,输出信号波形任意,可满足智能电网中相关设备性能校验的多种需求。同时对于大功率运放耗散功率大,输出稳定度差的问题提出了一种基于多物理参数模型的过热保护,采取有效的反馈调节提高其输出稳定度和精度。     

皂石矿物的水热合成试验

以硝酸镁、硝酸铝、硅酸钠为主要原料,试验了水热体系合成皂石（saponite）。通过粉末X-射线衍射（XRD）、傅立叶变换红外光谱（FTIR）等技术,考察了晶化时间、晶化温度对皂石结构演化的影响。提高水热晶化温度,对提高皂石结晶性有利。晶化时间短,皂石粒径小,结晶性差,但颗粒分布窄。晶化时间长,皂石粒径增大,结晶性好,热稳定性提高。     

鱼油乙酯在超亚临界二氧化碳中溶解度的测定和关联

在２５℃、４０℃和５０℃下，测定了含二十碳五烯酸（ＥＰＡ）和二十二碳六烯酸（ＤＨＡ）共７７．５９％的鱼油乙酯在超亚临界二氧化碳中的溶解度，并得到了相应条件下的ＥＰＡ和ＤＨＡ的分离度。用ＰＲ和ＳＲＫ方程对所测溶解度数据进行了关联。