用滴定突跃的绝对值推导四大滴定分析的直接准确滴定条件

建立了四大滴定分析"滴定突跃绝对值"的概念;用滴定突跃绝对值推导出四大滴定分析直接准确滴定的条件。     

基于纳米金粒子可视化分析检测的研究进展

基于纳米金粒子表面等离子共振性质发展起来的可视化分析,由于具有灵敏度高、可设计性强、分析过程快速等优点已被广泛地应用于各类目标分析物的检测,成为一种极具潜力的分析手段。本文综述了基于纳米金粒子表面等离子共振可视化分析检测的研究进展,并对其发展趋势进行了展望。     

基于探针法的FED电极缺陷检测系统设计

针对FED显示屏电极的特征,提出一种FED电极缺陷检测系统,用于检测FED电极的短路和断路等缺陷。系统分为硬件和软件两部分,硬件部分由CCD摄像头初始定位和对准模块、单片机数据测试和传输模块、计算机数据接收和处理模块组成;软件部分包括单片机预处理部分的底层程序设计和计算机部分面向对象的高级程序设计。经过硬件设计安装和软件编程调试,该FED电极缺陷检测系统已经在实验中得到应用。     

Simple lab-on-chip approach with time-based detection

A simple lab-on-chip approach with time-based detection is proposed. A platform is made from a piece of acrylic differently shaped channels for introducing sample and reagent(s) using flow manipulation. Time-based changes involving migration of the reaction zone are monitored. The changes can be visually monitored by using a stop-watch with naked eyes observation. Some applications for the determination of ascorbic acid, acetic acid and iron in real samples with different chemistries were demonstrated.     

Discussion

This article proposes a new hybrid visualization technique that integrates a frequency-based model and a generalized parallel coordinate plot (GPCP), thus mitigating the visual cluttering of GPCP. In the new technique, a GPCP’s profile lines (or curves) with similar frequencies are detected and saturated with appropriate color intensity corresponding to the frequencies. The technique may be employed to enhance a family of visualization tools—the Andrews plot and scatterplot matrix, for example. In addition to the new technique’s efficiency in reducing visual clutter in the multivariate data visualization techniques, it is computationally feasible, easy to implement, and has important mathematical and statistical properties. The reliability and accuracy of the technique are demonstrated through extensive experiments on challenging datasets, both simulated and real. These datasets are high in dimensions and large so that they cannot be explored with GPCP or frequency-based techniques alone.

The datasets for pollen, OUT5D, and California housing are available in the online supplements.     

Fast reciprocal nearest neighbors clustering

This paper presents a novel approach for accelerating the popular reciprocal nearest neighbors (RNN) clustering algorithm, i.e. the fast-RNN. We speed up the nearest neighbor chains construction via a novel dynamic slicing strategy for the projection search paradigm. We detail an efficient implementation of the clustering algorithm along with a novel data structure, and present extensive experimental results that illustrate the excellent performance of fast-RNN in low- and high-dimensional spaces. A C++ implementation has been made publicly available.     

一种微波功率计自动校准系统设计与实现

针对传统的手工校准微波功率计的局限性,设计并实现了一种基于Visual Basic软件平台组建的微波功率计自动校准系统。详细阐述了系统的硬件构成、工作原理、应用程序的设计以及不确定度的分析和评定。实际应用表明,该系统具有操作使用方便、测量精度高等优点。     

Lateral flow dipstick test for genotyping of 15 beta-globin gene (HBB) mutations with naked-eye detection

For definitive diagnosis of thalassemia carriers and patients, as well as for prenatal diagnosis, genotype analysis is of fundamental importance. We report a dry-reagent, lateral flow dipstick test that enables visual genotyping (detection by naked eye) of 15 mutations common in Mediterranean populations in the beta-globin gene (HBB). The method comprises 3 simple steps: (i) PCR amplification of a single 1896 bp segment of the beta globin gene flanking all 15 mutations; (ii) a multiplex (10-plex and/or 30-plex) primer extension reaction of the unpurified amplification product using allele-specific primers. Biotin is incorporated in the extended product; (iii) a dry-reagent multi-allele (10-plex) dipstick assay for visual detection of the primer extension reaction products within minutes. The total time required for PCR, primer extension reaction and the dipstick assay is ∼2 h. The method was evaluated by genotyping 45 DNA samples of known genotypes and 54 blind samples. The results were fully concordant with reference methods. The method is simple, rapid, and cost-effective. Detection by the dipstick assay does not require specialized instrumentation or highly qualified personnel. The proposed method could be a particularly useful tool in laboratories with limited resources and a basis for point-of-care diagnostics especially in combination with PCR amplification from whole blood.     

Influence of lateral discomfort on the stability of traffic flow based on visual angle car-following model

Due to the poor road markings and irregular driving behaviors, not every vehicle is positioned in the center of the lane. The deviation from the center can cause discomfort to drivers in the neighboring lane, which is referred to as lateral discomfort (or lateral friction). Such lateral discomfort can be incorporated into the driver stimulus–response framework by considering the visual angle and its changing rate from the psychological viewpoint. In this study, a two-lane visual angle based car-following model is proposed and its stability condition is obtained through linear stability theory. Further derivations indicate that the neutral stability line of the model is asymmetry and four factors including the vehicle width and length, the lateral separation and the sensitivity regarding the changing rate of visual angle have large impacts on the stability of traffic flow. Numerical simulations further verify these theoretical results, and demonstrate that the behaviors of diverging, merging and lane changing can break the original steady state and cause traffic fluctuations. However, these fluctuations may be alleviated to some extent by reducing the lateral discomfort.     

基于AT89S52型单片机的红外无线PPM发射机设计

脉冲位置调制(PPM)具有功率利用率高的优点,在室内红外无线局域网中得到广泛的应用。利用AT89S52型单片机和编程软件Visual C++设计了一种基于计算机串口的红外无线PPM发射机,介绍其硬件电路原理及计算机和单片机的软件设计方法。实现了PPM光脉冲的发送。