电厂输煤皮带落煤点趿尘装置的数值模拟与实践

对密闭罩内的湍流气．固两相流动进行了数值模拟。将气相作为连续介质，采用标准的k-ε双方程模型，并用SIMPLE算法对流场进行数值模拟；将固相作为离散相体系，采用离散相模型（DPM）的非偶合法追踪颗粒运动轨迹。通过对颗粒运动轨迹的分析，对该吸尘装置提出了改进措施，并进行了工业性试验，实际效果良好。     

Feasibility study of the application of voltage contrast to printed circuit board

Voltage contrast (VC) has been a powerful tool for the failure analysis of integrated circuits and multichip module. As the packing density of printed circuit board (PCB) is increasing, conventional failure analysis methods to detect open or short circuit in PCBs are no longer adequate, and voltage contrast method could be a method for this purpose. However, unlike the cases of integrated circuits and multichip module, there are many areas in PCB that will produce serious charging effect when examine under the scanning electron microscope. One of the areas is the presence of solder mask on PCB.This work examines the feasibility of using voltage contrast for PCB failure analysis. Specially designed PCB is used for experimentation, and it is found that positive bias on one track and zero bias on another copper track provide a better image contrast as compared to negative and zero biases on the tracks. Also, the variation of the image contrast with different spacing between inter copper tracks has studied. It is found that the variation depends on the presence of solder mask and its location. The variation can be very different for negative bias case as compared to the positive bias case.Finite element analysis is also performed to explain the experimental observations. All the observations can be well explained by the charging effect of the solder masks. The charging effect of solder mask is indeed very significant in affecting the image contrast, and it could reduce the contrast to almost zero in some cases.     

Exploring Two-Wave Reciprocal Structural Relations Among Orthographic Knowledge, Phonological Sensitivity, and Reading and Spelling of English Words by Chinese Students.

In a 2-wave study of a cohort of 108 Chinese students (10- to 11-year-olds) learning English as a second language, the authors examined the relative effects of three Time 1 latent constructs-- orthographic knowledge, phonological sensitivity, and word identification (reading and spelling of regular and exception words)--on the respective Time 2 performance. The authors posited autoregressive effects, in which Time 1 constructs affected their matching Time 2 performance (e.g., Time 1 orthographic knowledge on Time 2 orthographic knowledge), as well as reciprocal cross-domain effects (e.g., orthographic knowledge on word identification and vice versa). The model converged to a proper solution with reasonably good fit. The results suggest (a) strong stability in the children's word identification and phonological sensitivity, (b) substantial effects of word identification on subsequent orthographic knowledge and phonological sensitivity, particularly the former; and (c) greater variations in individuals' growth of orthographic knowledge. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Three-dimensional tracking and temporal analysis of liposomal transport in live cells using bright-field imaging

Gold nanoparticles (AuNPs) confined in liposomes of diameters around 200 nm produce strong scattering signal owing to surface plasmon resonance, and therefore bright-field optical tracking of the AuNP-encapsulating liposomes can be conducted in living cells. Using an optical profiling technique called noninterferometric wide-field optical profilometry and a bright-field tracking algorithm, the polynomial-fit Gaussian weight method, we analyze three-dimensional (3D) motion of such liposomes in living fibroblasts. The positioning accuracy in three dimensions is nearly 20 nm. We tag the liposome membranes with fibroblast growth factor-1 and reveal the intracellular transportation processes toward or away from the nucleus. On the basis of a temporal analysis of the intracellular 3D trajectories of AuNP-encapsulating liposomes, we identify directed and diffusive motions in the transportation processes.     

基于注意力机制和集成学习的网页黑名单判别方法

搜索引擎作为互联网主要应用之一,能够根据用户需求从互联网资源中检索并返回有效信息。然而,得到的返回列表往往包含广告和失效网页等噪声信息,而这些信息会干扰用户的检索与查询。针对复杂的网页结构特征和丰富的语义信息,提出了一种基于注意力机制和集成学习的网页黑名单判别方法,并采用本方法构建了一种基于集成学习和注意力机制的卷积神经网络（EACNN）模型来过滤无用的网页。首先,根据网页上不同种类的HTML标签数据,构建多个基于注意力机制的卷积神经网络（CNN）基学习器;然后,采用基于网页结构特征的集成学习方法对不同基学习器的输出结果执行不同的权重计算,从而实现EACNN的构建;最后,将EACNN的输出结果作为网页内容分析结果,从而实现网页黑名单的判别。所提方法通过注意力机制来关注网页语义信息,并通过集成学习的方式引入网页结构特征。实验结果表明,与支持向量机（SVM）、K近邻（KNN）、CNN、长短期记忆（LSTM）网络、GRU、结合注意力机制的卷积神经网络（ACNN）等基线模型相比,所提模型在所构建的面向地理信息领域的判别数据集上具有最高的准确率（0.97）、召回率（0.95）和F₁分值（0.96）,验证了EACNN在网页黑名单判别工作中的优势。     

A simple GPU-based approach for 3D Voronoi diagram construction and visualization

In this paper we propose a simple GPU-based approach for discrete incremental approximation of 3D Voronoi diagram. By constructing region maps via GPU. Nearest sites, space clustering, and shortest distance query can be quickly answered by looking up the region map. In addition, we propose another representation of the 3D Voronoi diagram for visualization.     

Extreme appraisals of internal states and bipolar symptoms: The Hypomanic Attitudes and Positive Predictions Inventory.

The Hypomanic Attitudes and Positive Predictions Inventory (HAPPI; W. Mansell, 2006) was developed to assess multiple, extreme, self-relevant appraisals of internal states. The present study aimed to validate the HAPPI in a clinical sample. Participants (N = 50) with a diagnosis of bipolar disorder (confirmed by a structured clinical interview) completed a series of questionnaires pertaining to clinical factors, reward motivation, cognitive style, symptoms, and functioning at baseline, in addition to the HAPPI. Over the following 4 weeks, participants were asked to complete self-report measures of symptoms (activation, perceived conflict, depression, and well-being), as well as work and social functioning, twice weekly. The authors hypothesized that the HAPPI would be associated with prospective bipolar symptoms and functioning, when controlling for baseline symptoms and potentially confounding measures. The HAPPI was positively, independently associated with activation and conflict after 4 weeks. Furthermore, individual HAPPI factors were associated with activation, conflict, and depression. The results provided preliminary support for the predictive validity of the HAPPI in a clinical sample. The HAPPI could be used in the future as a tool in cognitive behavioral therapy for bipolar disorder to identify problematic beliefs and guide formulation. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

生活用发化技术的现状和发展趋势

讨论了生活用水的分类、用水标准和健康饮水等问题 ,对目前给水净化技术进行了综述和分析。在此基础上 ,从建立合适的水质标准体系、净水工艺技术、监测管理等方面对供水发展趋势进行了论述 ,提出了有关供水问题的一些观点     

氧化镍薄膜气体传感器性能提升

本文的目的在于优化甲醛气体传感器.微型甲醛气体传感器设计是以石英玻璃当作基材,白金(Pt)被当作微型加热器电阻来加热感测层,并以氧化镍(NiO)薄膜作为感测层.当环境内有甲醛气体存在时,NiO薄膜层上导电度会增加,因而导致感测层电阻值降低.此微传感器,膜厚为0.34μm,在300℃反应时间只需6秒,灵敏度可达13.5 kΩ/ppb,最低侦测限度可以量测到40 ppb. 而本研究中针对不同的甲醛气体浓度,分别添加金当其催化剂、玻璃基材上共溅镀氧化镍与氧化铝、并比较有无指叉电极、改变基材温度…等,以提升其氧化镍薄膜感测性能.     

Equivalent characterizations of detectability and stabilizability for a class of linear time-varying systems

This paper addresses four characterizations of detectability and stabilizability for a broad class of linear continuous-time time-varying systems. It is shown that for the class of constant-rank systems all these notions of detectability and stabilizability are actually equivalent to each other.