摘要：Triangulation is widely used in scientific research, such as finite element mesh generation, surface reconstruction and the reconstruction of the density field data. This paper proposes a new method combining image processing and density-controlled Centroidal Voronoi tessellations to quickly generate a density-controlled constrained Delaunay triangulation lbr 2D sea area. Firstly, preprocess digital images of the sea area and extract the boundary of seawater region by eight-neighbor searching algorithm. Then, 1 use Odd-Even Testing＂ method to check if one random vertex is inside the boundary and insert random vertices into the boundary. Finally, we get the CDT of random vertices by density-controlled CVT-Lloyd method. We also give some comparisons with existing methods, and our method performs better in final restllt of triangulation.

摘要：We present main ideas of a recently proposed method for interactive multiobjective optimization,which is based on application of a logical preference model built using the Dominance-based Rough Set Approach(DRSA).

摘要：By contrasting the traditional way in which GIS was completed that comes with less flexible, low efficiency, and lack redundancy which cause high entry cost, the fast development of microkernel plug-in technology provides the lightweight, efficient and scalable solution to Geographical Information System (GIS). This paper is to reveal the potential of microkernel plug-in geospatial information processing technology in GIS design and practice, with the acceptance and usage of function model called Resource loading manager(RLM) for GIS applications, which provides a possible solution to overcome the GIS’s high cost issue. After the short review of microkernel plug-in technology, the possibility of GIS design with microkernel is analyzed. This paper also introduced the composition of the whole system and the design of GIS service platform based on middle-ware in detail.

摘要：This paper presents a new concept to implement a tunable filter metamaterial with dual negative refraction composed of ferrite slabs and metallic resonators, including split-ring resonators (SRR), and short wire pairs. The ferrite slabs under an applied magnetics bias provide one magnetic resonance frequency band and the metallic resonators provide another one. The continuous wires within the metamaterials provide the negative permittivity in a wide frequency band covering the two magnetic resonance bands. This type of metamaterialis analyzed in detail, and tunable stop band filters are successfully designed. The effective electromagnetic parameters obtained from the simulation of the S-parameters indicate that metamaterial exhibit negative refraction bands, which can be shifted by changing the magnetic bias.

摘要：最近,一种基于Bell态粒子和单光子混合的量子安全直接通信方案[物理学报65 230301(2016)]被提出.文章宣称一个量子态可以编码3比特经典信息,从而使得协议具有很高的信息传输效率.不幸的是,该协议存在信息泄露问题:编码在单光子上的3比特经典信息有2比特被泄露,而编码在Bell态上的3比特经典信息有1比特被泄露,所以它不是一个安全的直接量子通信方案.在保留原协议思想且尽可能少地更改原协议的基础上,我们提出一种改进的消息编码规则,从而解决信息泄露问题,使之成为一个高效、安全的量子通信协议.衷心希望研究者能对量子安全通信协议中信息泄露问题引起足够重视,设计真正安全的量子通信协议.

摘要：荧光探针是检测生物或者环境中相关物质的重要手段.传统的荧光探针由于聚集诱导猝灭引起的选择性差异和容易光漂白等问题限制了其应用.此外,在传统荧光探针的设计中通常引入猝灭基团,从而增加了探针合成及分离的难度.一类新型的具有聚集诱导发光(AIE)特征的荧光染料解决了上述问题.利用AIE发光团的独特性质,构建发光团与识别基团偶联的特异性“关开型”探针,这些探针具有背景低、选择性好和光稳定性强的优点.本综述主要概括并讨论了通过共价键断裂以及新键形成策略开发的具有AIE特征的荧光探针,并对其进行了展望.

摘要：目的 评估不同运动习惯的中国老年人进行居家脊柱后凸专项运动的可行性,探讨该运动计划对减少胸椎后凸角度和改善活动能力的效果.方法 本研究采用单组前后对照研究设计.在中国武汉市4个社区选取20名年龄≥60岁,患有胸椎过度后凸畸形且有康复潜力的老年人为研究对象.老年人接受为期6周的居家脊柱后凸专项运动干预,包括热身、肌肉加强、脊柱直立、脊柱灵活性和放松5个部分(22个动作),共有7次1 h的小组课程和35次的居家练习.在干预前后对老年人两种站立姿势下胸椎后凸角度、静态平衡、动态平衡、心肺功能、功能步态、疼痛及自我形象等指标进行评估并比较.采用老年人小组课程的出勤率、居家练习依从性及参与评价等指标来分析干预的可行性.结果 所有老年人均完成了小组课程和>75%的居家练习内容.干预后老年人在放松和最佳站立姿势下胸椎后凸角度较干预前均减少,中位数及四分位数间距分别 为-12.0°(-15.5°,-4.0°)(Z=-3.98,P<0.001)和-10.0°(-14.0°,-5.3°)(Z=-3.79,P<0.001).此外,干预后老年人疼痛程度明显减轻(P<0.001),自我形象认知得分提高(P<0.001),5项活动能力水平也有所提高(P<0.01).干预前后凸严重程度和日常体力活动强度不影响干预效果.大多数老年人认为干预强度适中且令人满意.结论 居家脊柱后凸专项运动在老年人胸椎过度后凸干预中具有可行性,并且可减少胸椎后凸角度,提升活动能力.

摘要：与无级变速器密切相关的是要解决选择车辆中传动系速比的问题。对于值得重视的传动系速比范围的情况,与曲轴有关的回转件的质量影响到传递至从动轮的功率。本文的理论研究和结果分析清晰表明,在CVT控制算式中必须考虑换档速度。

摘要：In this study, the wing design problem for different planforms for supersonic transport (SST) under supersonic and transonic cruise conditions is discussed to obtain knowledge of the supersonic air-foil from the viewpoint of wing planform dependency. Two types of planforms were considered—a cranked arrow wing with a high sweep-back angle and a tapered wing with a low sweep- back angle. The optimum airfoils of these planforms were designed by efficient global optimization, which combined the evolutionary algorithm with the Kriging surrogate model. To acquire design knowledge, the functional analysis of variance was applied to the solution space and the design space. The design results show that the optimum airfoil and the contribution ratios of design variables for the airfoils of the two planform are different.

摘要：目的对肾脏病维持动静脉瘘患者的自我护理行为研究进行整合性综述。方法采用整合性综述方法,以“慢性肾功能不全”“动静脉瘘管”,和“自我护理知识”等检索词在Medline/PubMed,Scopus,CINAHL,LILACS,BDENF和SciELO数据库中进行检索。纳入文献包括在过去5年中以葡萄牙语英语和西班牙语发表的相关论文,排除无研究设计或未遵循研究方法学的论文。采用IRAMUTEQ软件分析数据。结果最终15篇论文纳入研究。文本片段分析产生了7组自我护理行为词汇,归纳为3个类别:维持动静脉瘘的自我护理措施;预防和监测动静脉瘘并发症的自我护理措施;针对动静脉瘘术前准备的自我护理措施。结论研究结果有助于明确动静脉瘘功能维持的重要自我护理措施,可为制订针对肾脏患者的自我护理行为和相关资助实施方案提供参考。仍有必要开展更多可提供高水平证据的研究,确定动静脉瘘自我护理行为及实施过程中涉及的因素。