油井分时优化节能技术研究与应用

针对抽油井生产过程中存在的间开控制不灵活、工况调整不及时、阶梯电价未利用等问题。在现场控制柜内安装经济运行模块,控制中心安装分时优化控制管理平台,借助信息化系统实现远程通讯。分时优化控制管理平台下发控制指令,经济运行模块现场自动控制变频器调整抽油机冲次。实现峰期自动降频,节约电费;谷期自动增频补充尖峰期减少的产液量。达到产量基本不变情况下单井节约电费约30元/d,投资回收期4个月,经济及社会效益明显。     

Pb(Ni1/3Nb2/3)O3-PbTiO3系统准同型相界附近的介电、热释电和压电性能

用两步合成法制备了（１－ｘ）Ｐｂ（Ｎｉ１／３Ｎｂ２／３）Ｏ３－ｘＰｂＴｉＯ３系陶瓷,ｘ分别为０．２８,０．３０．０．３２,０．３４,０．３６,０．３８和０．４０,研究了试样的相组成以及介电,热释电和压电性能。ＸＲＤ结果分析表明：准同型要界在ＰｂＴｉＯ３摩尔分数ｘ＝０．３４￣０．３８处,组成在准同型相界附近的试样具有最大的介电常数,热释电系数和压电系数。介电性能测试结果还表明,组成在准同型相界附近的     

梯形试样撕破强力取值方式的分析

通过以不同取值方案作为计算梯形试样撕破强力的基准,对不同取值方法得到的试验结果进行了分析,得出梯形撕破最适用的取值方法是以首峰值作为取值起点,以位移-载荷曲线出现下降趋势之前的最后一个峰值作为取值终点。     

DOA估计中虚假谱峰的矩形消除

提出了一种增强MUSIC算法分辨力的方法。基本内容是通过天线间距的虚拟扩展提高天线的阵列孔径,达到增加算法分辨力的目的。同时,针对阵列间距虚拟扩展带来的虚假谱峰,提出了利用矩形窗函数进行虚假谱峰消除的方法,并给出了消除虚假谱峰的具体流程。仿真结果证明了天线间距虚拟扩展技术可以有效提高阵列天线的分辨力,同时,证明了矩形窗在消除虚假谱峰过程中的有效性,尤其当空间信号源间距较小时,改进算法的优势体现更加明显。     

基于FPGA的闭环自动增益控制系统

设计了一种基于FPGA的闭环自动增益控制系统,采样保持部分利用互锁技术采集VCA810输出的第1个有效波峰值电压大小,再经FPGA的AGC控制算法,产生控制电压值,经电压调整后,控制VCA810的输出.对本设计过程中产生的小数,做了变小数为整数的处理,从而提高了精度.     

Evidence for formation of multi-quantum dots in hydrogenated graphene

ABSTRACT: We report the experimental evidence for the formation of multi-quantum dots in a hydrogenated single-layer graphene flake. The existence of multi-quantum dots is supported by the low-temperature measurements on a field effect transistor structure device. The resulting Coulomb blockade diamonds shown in the color scale plot together with the number of Coulomb peaks exhibit the characteristics of the so-called 'stochastic Coulomb blockade'. A possible explanation for the formation of the multi-quantum dots, which is not observed in pristine graphene to date, was attributed to the impurities and defects unintentionally decorated on a single-layer graphene flake which was not treated with the thermal annealing process. Graphene multi-quantum dots developed around impurities and defect sites during the hydrogen plasma exposure process.     

基于GeoProbe插件平台的γ能谱解谱软件的实现

为能够有效提取到航空γ能谱重叠峰区域特征能量全能峰信息,采用C#语言编写的列布维格-麦奎尔特算法,实现了基于Geo Probe插件平台的γ能谱解谱软件。软件界面友好,便于用户方便快捷地对重叠峰进行高斯分解。并通过处理实测γ能谱数据,得到较准确的特征能量峰全谱数据,为航空γ能谱测量在矿产勘查、地质填图、环境放射性污染调查与评价以及核事故调查等方面提供有力帮助。     

X射线能谱重叠峰的识别

提出一种通过谱线权重来正确识别X射线能谱重叠峰的新方法，应用该方法，成功地分析了Ti合金微区中能量差为20eV的Ｔi的Ｖ的重叠峰，实验表明，该方法简便，可靠，并可适用于Ｋ－Ｚn之间元素的分析。     

Testing for cycles in multiple time series

In practice, it is often impossible to assess the validity of the smoothness assumptions crucial to standard tests for singularities in the spectrum. We therefore propose new tests which are completely insensitive to sharp peaks in the absolutely continuous part of the spectrum. Using Neyman Pearson tests of Bayesian mixtures we first derive admissible tests under simplifying assumptions and then show that under realistic assumptions our test statistics remain the same. The tests are designed to have high power especially against alternatives containing oscillations which are positively correlated with each other. Motivated by a biological dataset with non‐sinusoidal oscillations, we finally extend our approach by including higher harmonics.     

Half-Life and Gamma-Ray Energies of Lanthanum-144

A procedure using a complexing agent (NTA) in paper electromigration has been devised to achieve rapid separation of fission product lanthanum. This technique permits direct observation of the decay of the 42 sec ¹⁴⁴La without interference from the radiation of other fission products. The γ-ray spectrum of ¹⁴⁴La has been measured with a high-resolution Ge(Li) detector, and the following r-transitions were observed: 397, 434, 541, 586, 704, 734, 845, 951 and l,292keV. Their relative intensities were also determined. From the decay plots of the two strong photopeaks at 397 and 541 keV, the half-life of the ¹⁴⁴La was determined as 42.4±0.6sec which is more accurate than that of 41±3sec previously reported.

It is concluded that the separation procedure used in the present study can be adapted to the isolation of other short-lived fission products as well whenever their metal ions from the complexes by different values of the equilibrium constant.