基于ARM＆DSP的管螺纹梳刀刀片检测仪

以ARM & Linux系统为显控平台,DSP为数据采集、处理协处理器,完成了管螺纹梳刀刀片检测仪的设计.主要介绍了该检测仪的总体设计框架,并具体论述了该检测仪的软、硬件设计.该检测仪具有检测速度快、界面友好、成本低等优点.     

我拍“水上项目”

<正>我爱体育,也爱摄影。也许是因为出生在江南水乡,从小在水边长大,所以在体育项目中尤爱拍摄"水上项目"。2004年以来笔者拍了不少游泳、跳水、水球、花样游泳、滑水比赛等照片。近年来,每一次得到比赛的信息,都有一种莫名的冲动、忐忑、期待,这     

不只是Intel，AMD也玩ES版？

抛开当前闹得沸沸扬扬的Intel“ES版处理器”事件不谈，AMD的ES版处理器地市场上也大量存在，这些ES版处理器的出现，不仅是一种诱惑，更是对玩家硬件话别能力的一种挑战。[编者按]     

高档家电应配光盘使用说明书

随着人们生活水平的不断提高,各种家电产品已进入寻常百姓家,而生产厂家提供给消费者的产品说明书仍是传统的纸质说明书。由于人们家电知识水平有限,产品说明书上讲解的     

沃尔沃L180F HL型高举升轮式装载机

沃尔沃建筑设备新发布的L180FHL型高举升轮式装载机，针对木材的搬运，采用了新型举升臂设计，提高了举升高度和可操作性。在抓斗关闭时，L180FHL能够达到5．8m的举升高度，使它的堆垛高度比沃尔沃以前的E系列轮式装载机增加了210mm。通过去掉倾斜臂间的十字管，该机还采用新式倾斜臂设计，使视野更开阔。另外，以前作为选件的举升缸保护装置现在也变成了标准配置。     

大港无旁路300 MW机组甩负荷试验研究

介绍了300 MW无旁路机组甩负荷的试验过程,详述了在DEH组态中关于甩负荷所涉及的逻辑,并对甩负荷后中调门的控制方法和实际效果进行了对比分析及建议.     

5-甲基水杨醛缩对氨基水杨酸希夫碱镍配合物的合成、表征及其性质研究

本文以5-甲基水杨醛和对氨基水杨酸为原料合成希夫碱配体,该配体与Ni2+作用得到了5-甲基水杨醛缩对氨基水杨酸镍配合物,通过紫外吸收法、元素分析、红外光谱法对其结构进行表征,并通过EDTA滴定法确定了配合物的金属含量。用荧光光谱法研究了该化合物对牛血清白蛋白荧光光谱的影响,根据荧光猝灭效应Stern-Volmer方程和双对数回归模型计算该化合物和牛血清白蛋白在不同温度下的结合常数和结合位点数。     

基于ARM单片机的USB数据传输的设计与应用

现代工业控制中,上位机和下位机传输数据难,尤其在便携式采样终端需要把采集的数据回传给PC机这一领域,这样的数据传输有很多不便。采用ARM单片机、CH375和NANDFLASH组成的系统可方便地把数据存储到移动设备中,即使在没有移动设备的情况下,数据也能存储在FLASH中,而且也使主设备和从设备在同一个系统中得到实现。     

Fluorine geochemistry in bedrock groundwater of South Korea

High fluoride concentrations (median=4.4 mg/L) in deep bedrock groundwater of South Korea prevent the usage of it as a drinking water source. The hydrogeochemistry of deep thermal groundwaters (N=377) in diverse bedrocks has been studied in order to evaluate the geologic and geochemical controls on fluoride concentrations in groundwater. The groundwater samples were clustered geologically, and the average and median concentrations of fluoride were compared by the Mann-Whitney U test. The order of median fluoride concentration with respect to geology is as follows: metamorphic rocks> or =granitoids > or =complex rock>volcanic rocks> or =sedimentary rocks. This result indicates that the geological source of fluoride in groundwater is related to the mineral composition of metamorphic rocks and granitoids. With respect to groundwater chemistry, the fluoride concentration was highest in Na-HCO3 type groundwater and lowest in Ca-HCO3 type groundwater. Ionic relationships also imply that the geochemical behavior of fluoride in groundwater is related to the geochemical process releasing Na and removing Ca ions. The thermodynamic relationship between the activities of Ca and F indicates that fluoride concentration is controlled by the equilibrium of fluorite (CaF2). In other words, the upper limits of fluoride concentration are determined by the Ca ion; i.e., Ca concentrations play a crucial role in fluoride behavior in deep thermal groundwater. The result of this study suggests that the high fluoride in groundwater originates from geological sources and fluoride can be removed by fluorite precipitation when high Ca concentration is maintained. This provides a basis for a proper management plan to develop the deep thermal groundwater and for treatment of high fluoride groundwater frequently found in South Korea.