Coherent spectroscopy of a strongly driven triple quantum dot molecule

Based on a calculation model, we study the interference phenomena of serially coupled V-type and Λ-type triple quantum dots (CTQDs) driven simultaneously by a strong driving field and a weak probe field. Strongly depending on the configuration of the three-level CTQD, the probe absorption spectra, which are shown in the tunneling current, exhibit various quantum coherence properties. In the case where the two pairs of transitions of the CTQD have a small eigenfrequency difference Δω, the double-coupling effect of the driving field results in two Autler-Townes doublets and one weak Mollow triplet in one spectrum. With the value of Δω increasing, only one Autler-Townes splitting remains due to the single-coupling of the field. We also find that the effect of spontaneous emission of phonons may lead to an obvious background current, which can be used to distinguish which transition is driven by the driving field in experiment. The interesting quantum property of a CTQD revealed in our results suggests its potential applications in quantum modulators and quantum logic devices.     

基于DTW与K-means算法的河北场雨及雨型分区特征研究

深入挖掘气象站点的观测降雨数据,研究区域降雨的雨型规律,对于洪涝灾害预警和减灾措施制订有重要意义.本文基于河北省2005-2017年3189个站点逐小时降雨观测数据,进行"场雨"的划定,进而提取历史上各场雨的累积雨量、时长指标.采用数据挖掘技术中的DTW相似性算法进行场雨雨型的自动归类,将场雨分成Ⅰ-Ⅶ共7种雨型,包括...     

钢筋混凝土渡槽结构地震反应数值分析

首先介绍了钢筋混凝土渡槽结构在地震荷载作用下的分析理论,根据这些理论建立了渡槽结构的动力有限元分析模型,分别采用干模态法、附加质量法和ALE法考虑渡槽结构液固耦合作用,通过具体的工程算例,对钢筋混凝土渡槽结构进行了不同工况下的数值模拟研究,包括混凝土非线性材料分析、渡槽结构静水与动水响应分析、渡槽结构自振特性分析和槽墩的能力曲线分析。研究表明,考虑固液耦合作用的渡槽实体有限元模型能较好地模拟渡槽结构地震反应,并得到相应的渡槽结构地震反应规律。     

校正大地电磁测深中静态效应的首枝重合法

着重论述如何用首枝重合法校正静态效应。提出用等权正交多项式拟合视电阻率曲线真实位置；指出了选择参考频率的原则；以及如何自动识别是否有静态效应的影响，产生了何种形式的静位移。分析静校正处理后的资料可知，静态效应影响几乎无所不在，但在盆地沉积中心有可能无静位移情形；静位移的形式是多样的，但主体形式是ρ＿（ＴＥ）曲线向上，ρ＿（ＴＭ）曲线向下位移，且ρ＿（ＴＥ）曲线在ρ＿（ＴＭ）曲线之上；ρ＿（ＴＥ）曲线与ρ＿（ＴＭ）曲线基本上一样容易产生静位移。     

单柱离子色谱测定二氧化锰产品中无机阴离子杂质

采用了单柱离子色谱法测ＭｎＯ２产品中无机离子杂质；提出了消除干扰的可行途径，将Ｌａ（ＯＨ）３加入后能同时消除进样峰的干扰和溶剂峰的出现。选用１．７５ｍｍｏｌ／Ｌ邻苯二甲酸１．７５ｍｍｏｌ／Ｌ三羟甲基氨基甲烷为混合淋洗剂测定Ｆ＾－，Ｃｌ＾－，ＮＯ３＾和ＳＯ＾２－４，其标准加入回收率为９５％－１０５％；ＲＳＤ（ｎ＝７）为２．４７％－８．０８％。     

对Nakai拟合法的改进及实际应用

本文对Nakai拟合法作了改进并应用于计算井水固体潮和气压系数。利用该方法还可以计算井水位对固体潮和气压响应的滞后时间。以鲁06井为例,用本文的方法计算出其井水位的固体潮和气压系数分别为16.9mm/10~(-3)和5.58mm/hPa,滞后时间分别为18.8和22.4分钟。校正后的中误差由8.5mm下降到6.1mm。     

Evaluation of factors influencing the inelastic seismic performance of torsionally asymmetric buildings

This paper addresses some fundamentally contradictory conclusions drawn by Tso and Ying¹ and the authors² regarding the additional seismic ductility demand in asymmetric building structures and the adequacy of certain code torsional provisions. It also clarifies a number of issues arising from the different approaches employed in the two studies. The Mexico 76 and 87 code torsional provisions are taken as examples. Results show that the structural element at the stiff edge is the more critical and that the Mexico 76 code torsional provisions (among others) are inadequate, substantially underestimating the strength demand of this element. On the other hand, the Mexico 87 code torsional provisions are found to be over-conservative. Recommendations are also given for improving the form and effectiveness of these code torsional provisions.     

对饱和粘性土渗透规律的新认识及其应用

通过实验，对饱和粘性土的渗透规律进行研究，得到几点新认识。利用此认识建立了饱和粘性土越流补给量的计算公式，并在实际应用中得到验证。