近岸带三组成波耦合作用的观测与分析

利用近岸带两个测点的波浪同步观测资料,通过二阶谱分析了三组成波的非线性相互作用。对波谱峰频自相互作用的二阶相干系数b2(fp,fp)及对应的二阶位相值β(fp,fp)、最大二阶谱幅值B最大(f1,f2)和最大二阶相干系数b2最大(f1,f2)的组成波频率分析结果表明:(1)弱频散作用的过渡水深区存在着明显的非共振三组成波耦合作用;(2)包括谱峰频在内的自相互作用是近岸区波耦合作用的重要形式;(3)随着水深减小,趋近碎波带,非线性耦合作用进一步增强,谱能量以向低频转移为主变为向高、低频两侧转移,波形趋于前倾。

一个偶合离散海浪模式

本文讨论的海浪模式(以下简称CDWM)结合了计算风浪过程的参数化方法和处理涌浪过程的离散化方法的优点,并且还包含了涌浪和风浪之间的相互转化。波浪成长过程包括从风场中的能量输入、波浪破碎以及底摩擦引起的能量耗散,并在波浪的传播过程中考虑了非均匀海底引起的波浪折射。

一种基于简化波组成和特征函数的多径簇信道包络分布分析方法

文中针对移动通信场景下多径簇信道的物理传播机制,采用简化波的组成和特征函数的方法,对多径来波信号的包络概率密度进行了分析与研究,得出了多径来波信号包络概率密度函数的闭式解。文中通过几种特殊的情况下的闭式解验证了理论的正确性,并在文章最后提出了一种移动通信场景下求解任何多径簇信道的包络概率密度的算法。

Composition Estimation of Reactive Batch Distillation by Using Adaptive Neuro-Fuzzy Inference System

Composition estimation plays very important role in plant operation and control.Extended Kalman filter(EKF) is one of the most common estimators,which has been used in composition estimation of reactive batch distillation,but its performance is heavily dependent on the thermodynamic modeling of vapor-liquid equilibrium,which is difficult to initialize and tune.In this paper an inferential state estimation scheme based on adaptive neuro-fuzzy inference system(ANFIS) ,which is a model base estimator,is employed for composition estimation by using temperature measurements in multicomponent reactive batch distillation.The state estimator is supported by data from a complete dynamic model that includes component and energy balance equations accompanied with thermodynamic relations and reaction kinetics.The mathematical model is verified by pilot plant data.The simulation results show that the ANFIS estimator provides reliable and accurate estimation for component concentrations in reactive batch distillation.The estimated states form a basis for improving the performance of reactive batch distillation either through decision making of an operator or through an automatic closed-loop control scheme.

Older Migrants： Finding Strategies for Sustaining Family Relationships

Issues specific to older migrants moving country are not yet fully understood as there are few studies on this age group. These migrants are most likely to be caught in attending to the needs of their children or their elderly parents, both requiring support. Over a period of two years, 35 older Polish migrants were interviewed and they told their stories of the migration experience. It was found that they had to make choices and were faced with quite difficult decisions on whether they were going to leave children or parents in Poland while they were forced into a position where they had to find work outside their own country due to age discrimination. Both men and women expressed feelings of guilt at leaving sick parents, and at not being able to afford to travel back to Poland more regularly to be with their families. Without effective cost or free digital technology, these families would not be able to sustain communication channels and relationships would break down. Consequently both the economic and emotional costs to these families and the communities in which they live could be very high.

Fluorescence Discrimination and Determination Technique for Phytoplankton Composition by Coif2 Wavelet Packet

An in vivo fluorescence discrimination technique for phytoplankton population was developed by using Wavelet packet transform, cluster analysis and non-negative least squares. The technique was used to analyze water samples from different sea regions. For simulative mixtures, when dominant species account for 60%, 70%, 80%, 90% at the division level, the correct discrimination ratios (CDRs) are 83.0%, 99.1%, 99.7% and 99.9% with the relative contents of 58.5%, 68.4%, 77.7% and 86.3%, respectively; when the algae dominance are 60%, 70%, 80%, 90%, 100% at the genus level, the CDRs are 86.1%, 94.9%, 95.2%, 96.8% and 96.7%, respectively. For laboratory mixtures, the CDRs are 88.1% and 78.4% at the division and genus level, respectively. For field samples, the CDRs were 91.7% and 80% at the division and genus level, respectively (mesocosm experiments), and the CDRs were 100% and 66.7% at the division and genus level, respectively (Jiaozhou Bay). The fluorometric technique was used to estimate the phytoplankton community composition and relative abundance of different classes for the April 2010 cruise in the Yellow Sea with the results agreeing with those in published papers by other authors.

Board Members Oversight System- A Polish Example

The goal of the study was the development of a system to monitor the members of supervisory and management boards. The system currently covers 8,454 joint stock companies registered in Poland. The main purpose of the system is to monitor every change in the composition of every board of every joint stock company, from March 2001 up to the present, and it is updated every month. This system, however, also enables us to confirm some of the theories from the field of corporate governance. A generation change has been identified in the boards of the joint stock companies which were examined. Women constitute a large, and continuously increasing, section of the board members. The number of family companies, and of family involvement in boards, is still increasing. Board members of financial institutions （and not just of banks） possess significantly more directorates than board members of non-financial institutions. The number of interlocking directorates is positively linked to the macroeconomic development indicator of the total investment as percentage of GDP for Poland.

Harmfulness of Leaf Miners （Agromyzidae） on Winter Wheat Plantations in Poland

The aim of the study was to determine the harmfulness of leaf miners and their species composition on winter wheat for the improvement of methods to control them. In order to determine the dates of the treatments, it was necessary to catch adult flies. The researchers used yellow 25 x 40 cm sticky traps placed on three control plots to catch the adults. Monitoring of cereal leaf miners flights in winter wheat was carried out in Babor6wko （greater Poland voivodeship）. Yellow traps were placed above the tops of wheat during vegetation period. The number of damaged wheat stems was recorded. Fluctuations in weather conditions during the research affected the dynamics of leaf miner flies considerably. The maximum flights of leaf miner flies on winter wheat crops in years of the studies took place in May. The dynamics of leaf miners flights were different in growing season 2008 and 2009. The most common species were： Chromatomyia nigra （Ztt.）, Chromatomyia fuscula （Ztt.） and Poemyza superciliosa （Ztt.）. It was also discovered that the species composition of Agromyzidae damaging the winter wheat, changes in particular years. The results differ from the results of the previous research, which the dominant species were Phytomyza nigra （Mg.） and Agromyza ambiqua （FII.）.