摘要：We constructed a single C-Bézier curve with a shape parameter for G2 joining two circular arcs. It was shown that an S-shaped transition curve, which is able to manage a broader scope about two circle radii than the Bézier curves, has no curvature extrema, while a C-shaped transition curve has a single curvature extremum. Regarding the two kinds of curves, specific algo- rithms were presented in detail, strict mathematical proofs were given, and the effectiveness of the method was shown by examples. This method has the following three advantages: (1) the pattern is unified; (2) the parameter able to adjust the shape of the tran- sition curve is available; (3) the transition curve is only a single segment, and the algorithm can be formulated as a low order equation to be solved for its positive root. These advantages make the method simple and easy to implement.

摘要：In computer aided geometric design(CAGD) ,it is often needed to produce a convexity-preserving interpolating curve according to the given planar data points. However,most existing pertinent methods cannot generate convexity-preserving in-terpolating transcendental curves;even constructing convexity-preserving interpolating polynomial curves,it is required to solve a system of equations or recur to a complicated iterative process. The method developed in this paper overcomes the above draw-backs. The basic idea is:first to construct a kind of trigonometric polynomial curves with a shape parameter,and interpolating trigonometric polynomial parametric curves with C2(or G1) continuity can be automatically generated without having to solve any system of equations or do any iterative computation. Then,the convexity of the constructed curves can be guaranteed by the appropriate value of the shape parameter. Performing the method is easy and fast,and the curvature distribution of the resulting interpolating curves is always well-proportioned. Several numerical examples are shown to substantiate that our algorithm is not only correct but also usable.

摘要：目的在浙江推动山海协作和助力山区26县高质量发展的背景下,依托智能创意设计理念,基于智能语义分析技术探索乡村非遗品牌的创新模式与设计策略。方法通过文献研究结合实地调研梳理出地域性乡村非遗品牌构建的特点与不足;依托智能创意设计为理论基础,为乡村非遗品牌构建新的设计模式;针对国内文创产品的受众评价选取典型数据源,利用智能数字技术进行词频统计、情感倾向分析和LDA主题分析;以挖掘品牌文化、建立品牌形象、创新品牌活力为着力点,提出乡村非遗品牌形象创新设计策略。结论基于机器学习、智能语义分析等信息技术的赋能,提出未来乡村建设背景下的非遗品牌形象创新设计策略,将智能设计、内容创意和文化价值相融合,为乡村非遗品牌设计打造新的模式,为乡村文化创意产业的发展探索新方向。

摘要：在化石能源消耗和环境污染的双重压力下,新能源发电及氢能备受关注。氢能燃料电池车辆作为目前最为广泛的氢能终端应用场景,对氢燃料储用系统的重量、存储能力、安全性能提出了更高的要求。车载液氢气瓶以其高密度、轻量化被广泛认为是下一阶段燃料电池车辆燃料箱的重要型式,车载液氢气瓶的安全性、绝热性是目前的关键难题。鉴于氢燃料电池汽车使用环境复杂、事故危害大,车辆的本质安全和高效节能十分重要,但车载液氢气瓶的设计方法并不完善,存在材料脆断、疲劳失效、真空丧失等失效风险。本文针对车载储氢气瓶关键设计环节,从选材、选型、设计和测试环节出发,从液氢气瓶材料韧脆转变性、车载液氢气瓶静动力学分析、车载液氢气瓶疲劳寿命、车载液氢气瓶使用过程及真空丧失后的绝热性能、车载液氢气瓶增压设计和增压传热方面综述了研究的历史发展情况、相关研究进展情况,分析了目前国内外研究的情况,预测了与车载液氢气瓶相关的研究趋势,最后对车载液氢气瓶的设计关键技术做了总结与展望。

摘要：针对非保压取样方法难以获取高质量生物样本的问题,提出全海深宏生物保压取样器.考虑海上布放对装置质量的限制,提出中空式活塞取样结构.针对深海的超高压环境,分析常规蓄能器设计中理想气体状态方程的不适应性,提出基于真实气体状态的设计方法.针对密封圈移动引起的压降,设计液体主动补偿技术.内压试验结果表明,保压筒和取样活塞具有足够的强度和良好的密封性.高压舱测试表明,提出的取样系统在高压下可以稳定工作,设计的压力补偿系统能够显著地提高取样器的保压性能.取样器在马里亚纳海沟深度超过10 800 m深度时进行2次原位实验,共获取端足类生物保压样品174只.

摘要：为提升床类产品智能化创新设计过程的合理性,体现用户行为与多感官需求研究在智能床设计中的作用,提出一种基于多感官需求的B/A-Kano/FAST设计流程(用户行为旅程图Behavior Journey Map、A-Kano模型和功能分析系统技术FAST法)。对智能床的用户行为进行调研分析,采用用户行为旅程图找出用户对智能床的多感官需求;通过帕累托原理筛选需求,使用A-Kano模型获取需求类别,以建立功能需求类型列表;引入FAST法将需求逐步转化为产品功能,对总功能求解,指导产品方案设计;实例验证以智能床为研究对象,结合该设计流程对智能床进行分析与设计实践,通过李克特量表进行用户满意度评估,验证设计效果。B/A-Kano/FAST设计流程能将用户的多感官需求转化为产品功能模块,有助于获得符合用户真实需求的产品智能化设计方案。

摘要：文章首先阐述了阆中丝毯文化的概述与艺术特色,阆中丝毯元素在主题餐饮空间运用的必要性及运用方法,从非遗传承视角,打造蕴含阆中丝毯优秀织造技艺和特色文化的主题餐饮空间,以期为继承发扬阆中丝毯文化、设计富含地域特色的中国餐饮空间提供一些思路。

摘要：星云纹铜镜是汉代铜镜中比较重要的镜式,从现有资料看,星云纹铜镜应出现在汉武帝时期,广泛流行于西汉中期,逐渐衰落于西汉晚期和东汉前期。星云纹铜镜的出现反映了汉代高超的铸造技术,不仅具有文物价值,还具有较高的艺术和科技价值,同时还是当时社会思想观念在经济领域的返照。

摘要：A new algorithm is presented that generates developable Bézier surfaces through a Bézier curve called a directrix. The algorithm is based on differential geometry theory on necessary and sufficient conditions for a surface which is developable, and on degree evaluation formula for parameter curves and linear independence for Bernstein basis. No nonlinear characteristic equations have to be solved. Moreover the vertex for a cone and the edge of regression for a tangent surface can be obtained easily. Aumann’s algorithm for developable surfaces is a special case of this paper.

摘要：This paper presents a systematic investigation and demonstration of a K-band circularly polarized liquidcrystal-based phased array(LCPA),including the design,over-the-air(OTA)in-array calibration,and experimental *** LCPA contains 16 phase-shifting radiating channels,each consisting of a circularly polarized stacked patch antenna and a liquid-crystal-based phase shifter(LCPS)based on a loaded differential line *** to its slow-wave properties,the LCPS exhibits a maximum phase-shifting range of more than 360°with a figure of merit of 78.3(°)·dB^(-1)based on a liquid crystal layer with a thickness of only 5μ***,an automatic OTA calibration based on a state ergodic method is proposed,which enables the extraction of the phase-voltage curve of every individual LCPA *** proposed LCPA is manufactured and characterized with a total profile of only 1.76 mm,experimentally demonstrating a scanned circularly polarized beam from-40°to+40°with a measured peak gain of 12.5 dBic and a scanning loss of less than 2.5 *** bandwidth of the LCPA,which satisfies the require-ments of port reflection(|S_(11)|)<-15 dB,an axial ratio(AR)<3 dB,beam squinting<3°,and a gain variation<2.2 dB,spans from 25.5 to 26.0 *** total efficiency is about 34%,which represents a new state of the *** use of the demonstrated low-profile LCPA to support circularly polarized scanning beams,along with the systematic design and calibration methodology,holds potential promise for a variety of millimeter-wave applications.