离散系统LQ调节器的鲁棒性分析

本文研究了离散ＬＱ调节器系统鲁棒稳定性问题，稳定的不确定参数是通过考虑参数摄动的方向而求得的，这种方法比现有文献提供的结果具有更好的稳定范围。     

2-Transitivity is Insufficient for Local Testability

A basic goal in property testing is to identify a minimal set of features that make a property testable. For the case when the property to be tested is membership in a binary linear error-correcting code, Alon et al. (Trans Inf Theory, 51(11):4032–4039, 2005) had conjectured that the presence of a single low-weight codeword in the dual, and “2-transitivity” of the code (i.e., the code being invariant under a 2-transitive group of permutations on the coordinates of the code) suffice to get local testability. We refute this conjecture by giving a family of error-correcting codes where the coordinates of the codewords form a large field of characteristic two, and the code is invariant under affine transformations of the domain. This class of properties was introduced by Kaufman & Sudan (STOC, 2008) as a setting where many results in algebraic property testing generalize. Our result shows a complementary virtue: This family also can be useful in producing counterexamples to natural conjectures.     

Nontoxic poly(ethylene oxide phosphonamidate) hydrogels as templates for biomimetic mineralization of calcium carbonate and hydroxyapatite architectures

A simple protocol has been developed for the creation of the biomimetic hybrid materials, calcium carbonate, and hydroxyapatite, by in situ growth and mineralization in newly developed nontoxic hydrogel templates. A series of poly(ethylene oxide phosphonamidate) hydrogels with different network structures were synthesized by reacting various poly(ethylene glycol)s with phosphorous oxychloride and diamines in a one-pot protocol, which exhibits promising advantages including a short reaction time, an easy separation, and a high yield with a mass producible feasibility. The hydrogels were proven to be nontoxic according to an in vitro viability assay using human embryonic kidney 293T cells. Careful control of growth and mineralization conditions such as ions transport rate, pH, type of hydrogel, and mineralization temperature resulted in a variety of calcium carbonate and hydroxylapatite architectures including nanorods, nanowires, and well-defined hybrid structures. The resulting materials were analyzed by infrared spectroscopy, electron microscopes, energy-dispersive X-ray spectroscopy, and X-ray powder diffraction.     

Real time object detection and trackingsystem for video surveillance system

Multimedia Tools and Applications - This paper introduces a system capable of real-time video surveillance in low-end edge computing environment by combining object detection tracking algorithm....     

The Rise of Retinal Organoids for Vision Research

Retinal degenerative diseases lead to irreversible blindness. Decades of research into the cellular and molecular mechanisms of retinal diseases, using either animal models or human cell-derived 2D systems, facilitated the development of several therapeutic interventions. Recently, human stem cell-derived 3D retinal organoids have been developed. These self-organizing 3D organ systems have shown to recapitulate the in vivo human retinogenesis resulting in morphological and functionally similar retinal cell types in vitro. In less than a decade, retinal organoids have assisted in modeling several retinal diseases that were rather difficult to mimic in rodent models. Retinal organoids are also considered as a photoreceptor source for cell transplantation therapies to counteract blindness. Here, we highlight the development and field’s improvements of retinal organoids and discuss their application aspects as human disease models, pharmaceutical testbeds, and cell sources for transplantations.     

Hexafunctional poly(propylene glycol) based hydrogels for the removal of heavy metal ions

Two types of degradable poly(propylene glycol) (PPG) hydrogels that are suitable for the absorption of heavy metals have been presented. The PPG‐O‐P(O)Cl₂ fragments obtained by treating hexafunctional PPG with phosphorous oxychloride (POCl₃) react with 1,3‐propanediamine (PDA; Gel‐1 ) or PDA together with 1,2‐ethanedithiol ( Gel‐2 ), to yield cross‐linked and water‐swellable hydrogels in a one‐pot method. This protocol for the fabrication of PPG hydrogels exhibits promising advantages over prior methods including a short reaction time, mass‐production, easy separation, and high yield. A series of heavy metal ions were employed to test the adsorptive properties of the hydrogels. Gel‐2 shows better adsorption capacity than Gel‐1 for all the metal ions and the metal ions adsorption efficiency of the two types of hydrogels is in the order of Fe(III) > Pb(II) > Cd(II) > Zn(II) > Cu(II) > Ni(II) > Co(II) > Hg(II). The amounts of metal ions adsorbed increases with metal ion concentration and hydrogel dosage, but decreases with temperature. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40610.     

海底管道泄漏的事件树和故障树相结合分析

海底管道一旦发生泄漏,危害很大,为了分析其引起的不同后果,建立了海底管道系统泄漏事件树模型.根据事件树和故障树各自不同的特点,提出了将两者结合运用的方法.将故障树分析应用到已构建好的事件树中,通过故障树的定量分析求出事件树中初因事件和后续事件的发生概率,最终实现事件树的定量分析,得出各后果事件的发生概率.从而得到一个完整的海底管道泄漏危害分析的方法.     

情感化视角下黎锦文创产品设计研究

目的 以实现“非遗”文化在当代的创造性传承与发展为目的,从情感化设计的视角探究“非遗”黎锦文创产品的创新设计路径。方法 首先,采用文献研究法对黎锦的艺术特色和文化意蕴进行提炼;其次,结合文献分析、问卷调查和实地考察,对黎锦文创产品的设计研究现状及用户特点进行分析;再次,通过对黎锦文创产品进行情感化的层次分析,从三个层面设计黎锦文创产品的情感化方法模型,即基于“美”的视觉营造、基于“趣”的互动创新、基于“思”的隐喻构建;最后,以设计实践验证该方法。结论 让情感化理念介入黎锦文创产品设计,有助于设计师寻找到现代用户与黎锦文创之间的情感共鸣点,从外到内,层层提升黎锦文创产品的情感吸引力,实现产品与用户之间的持久性连接,进而使“非遗”黎锦在当代生活中焕发新的活力。     

强化淀粉类食品中7 种水溶性维生素的快速测定

建立高效液相色谱-二极管阵列-荧光联用法同时检测营养强化淀粉类食品中7 种水溶性维生素含量的方法。样品经淀粉酶60 ℃酶解45 min,调pH值提取后,经十二烷基硫酸钠（5 mmol/L,加入0.1%磷酸,三乙胺调pH 3.0）-乙腈梯度洗脱,VB1、烟酸、烟酰胺在不同波长下进行检测,VB2、吡哆醛、吡哆醇、吡哆胺采用目标物出峰时间段转变激发、发射波长检测。7 种维生素在各自线性范围内线性关系良好,相关系数r2为0.999 6～0.999 9,加标回收率为90.5%～102.5%,检出限为0.01～0.08 mg/100 g,定量限为0.025～0.26 mg/100 g。方法快速、高效,适用于大批量强化淀粉类食品中7 种水溶性维生素的同时测定。     

平面开关磁阻电机非线性力电流转换模型

为提高平面开关磁阻电机的运动精度,提出了一种平面开关磁阻电机非线性力电流转换模型。该模型表示为一个稀疏最小二乘支持向量机,以实测数据作为训练样本,利用交叉验证方法确定了稀疏最小二乘支持向量机参数,并通过实测的样本进行了准确性验证。构建了基于该模型的平面开关磁阻电机PD控制系统,并进行了系统运动控制实验。研究结果表明,该模型的相电流预测准确度高、建模误差小,基于该模型的平面开关磁阻电机系统能够实现稳定、平稳和精确的轨迹跟踪。