摘要：在传统设计制造中,设计师借助模具的正负形关系复刻各种形态,因而正负形的边界在一开始便被人为设定。本文基于无定型材料的设计实验,结合设计领域对于空间正负形的各类思考,旨在探讨一种由材料主导的空间正负形关系。最终引导出非人为控制的设计方式,为设计形式提供多样可能性。

摘要：In order to overcome the limitations of traditional microperforated plate with narrow sound absorption bandwidth and a single structure,two multi-cavity composite sound-absorbing materials were designed based on the shape of monoclinic crystals:uniaxial oblique structure(UOS)and biaxial oblique structure(BOS).Through finite element simulation and experimental research,the theoretical models of UOS and BOS were verified,and their sound absorption mechanisms were *** the same time,the influence of multi-cavity composites on sound absorption performance was analyzed based on the theoretical model,and the influence of structural parameters on sound absorption performance was *** research results show that,in the range of 100-2000 Hz,UOS has three sound absorption peaks and BOS has five sound absorption *** frequency range of the half-absorption bandwidth(α>0.5)of UOS and BOS increases by 242% and 229%,*** with traditional microperforated sound-absorbing structures,the series and parallel hybrid methods significantly increase the sound-absorbing bandwidth of the sound-absorbing *** research has guiding significance for noise control and has broad application prospects in the fields of transportation,construction,and mechanical design.

摘要：An efficient photocatalytic CO_(2) reduction has been reported in ZIF-67-derived-Co nanoparticles(NPs)encapsulated in nitrogen-doped carbon layers(N-C/Co).This work demonstrates that the pyrolysis temperature is crucial in tuning the grain size and components of metallic Co^(0) of N-C/Co composite catalysts,which optimizes their photocatalytic *** were conducted at 600,700,and 800℃ giving the N-C/Co-600,N-C/Co-700,and N-C/Co-800 samples,respectively.N-C layers can well wrap the Co NPs obtained at a low pyrolysis temperature(600℃)owing to their smaller grains than those of other samples.A high metallic Co^(0) content in the N-C/Co-600 sample can be attributed to the effective inhibition of surface *** contrast,the surface CoOx oxides in the N-C/Co-700 and N-C/Co-800 samples cover inside Co cores,inhibiting charge separation and *** a result,the N-C/Co-600 sample yields the best photocatalytic *** carbon monoxide and hydrogen generation rates are as high as 1.62×10^(4) and 2.01×10^(4)μmol g^(−1)h^(−1),***,the Co NPs make composite catalysts magnetic,enabling rapid and facile recovery of catalysts with the assistance of an external magnetic *** work is expected to provide an instructive guideline for designing metal-organic framework-derived carbon/metal composite catalysts.

摘要：Energy crisis and environmental problems urgently drive the proposal of new strategies to improve human wellbeing and assist sustainable *** this end,scientists have explored many metal oxides-based photocatalysts with high stability,low cost,earth abundance,and potentially high catalytic activity relevant for key applications such as H2O splitting,CO2 reduction,N2 fixation,and advanced oxidation of *** these metal oxides,oxygen vacancies(OVs)are ubiquitous and intrinsic defects with pronounced impacts on the physicochemical properties of the catalysts,which may open new opportunities for obtaining efficient metal *** thorough understanding of the structural and electronic nature of OVs is necessary to determine how they serve as catalytically active *** this review,we summarize the origin of OVs,the strategies to introduce OVs,as well as the fundamental structure-activity relationships to relate these crystal defects to catalyst properties including light absorption,charge separation,*** emphasize the mechanism of OVs formation and their effects on the intrinsic catalytic characteristics of the metal *** also present some multicomponent catalytic platforms where OVs contribute to catalysis via ***,opportunities and challenges on engineering defects in photocatalysts are summarized to highlight the future directions of this research field.

摘要：ChatGPT和AI虚拟现实技术快速升级推广及应用,对传统动画行业中的角色设计、原画设计、动作捕捉等都产生了革命性的影响甚至被新CG技术取缔。对新技术的到来我们如何不被动的被淘汰,我们需要调整自己的思路和理念,用全新的观念、全新的思路、全新的战略来迎接和利用好新的技术,对我们的文创研发、乡村振兴、智能化产品升级等,都是一个全新的课题。无论技术多么的快速升级革新,但是,根植于我们民族内心的优秀传统审美、普世的价值观不会变化。我们对具有中国特色的动画角色造型设计、场景设计表达、叙事结构构建、传统伦理道德的传承、价值观导向的树立都不会因为技术的革新而改变。

摘要：为了进一步提高脉冲爆震发动机(PDE)的推进性能,对PDE使用流体喷管模型进行了多循环数值模拟研究,并提出了主次流错相位喷注方案。结果表明:主次流错相位喷注方案不仅可以调节主流和二次流的有效流通面积,改善喷管的非设计点状态,而且可以提高爆震室内可燃气最终充填压力,增强爆震燃烧强度;在主次流错相位喷注方案下,喷管主流进口瞬时气流总压相对喷管设计点的离散程度明显下降,有效改善了喷管的非设计点状态;最佳的主次流相位差为反传压缩波恰好传播至爆震室头部这一工况,最佳的二次流喷注位置为喷管喉部;相比基准喷管的最大比冲性能,PDE使用流体喷管可以产生5.64%的比冲增益。

摘要：隐晦性作为艺术作品深沉内涵的显像特征,是中国传统文化所造就的,并在中国艺术发展史上发挥着重要作用。中国画中的隐晦,美在迂回曲折,含蓄委婉,有弦外之音、味外之旨,能给人带来更多审美的愉悦体验。其中蕴含着内敛含蓄的“中庸之道”,自古以来被文人雅士高度重视且备受推崇,成为艺术家在追求艺术本身价值与个体精神意图有机统一的过程中极具魅力的呈现。

摘要：为解决猕猴桃采摘过程中易刮伤果实表皮的问题,设计一种新型的包覆式气囊夹爪,基于气动控制气囊的膨胀与收缩,实现果实的收纳与包覆,并通过增加果实与夹爪的受力面积,减少夹爪对果实的挤压,在保证果实不受损伤的前提下提高采摘成功率。以底部向上捕捉、剪切收获果实的采摘方式,设计气囊夹爪的机械结构;通过有限元模拟,对采摘过程中气囊与果实的受力情况进行分析,证明设计的夹爪受力点主要在气囊夹爪上下表面,贴合性高。经过实地采摘试验,测试不同气压下气囊夹爪的采摘成功率以及损伤率,确定夹爪气压为40 kPa时,采摘效果最好,成功率达95%,损伤率曲线与手工采摘最为相似。

摘要：与线性工程相交的断裂的抗断设计参数需要提供断裂展布与断裂活动方式、破碎带宽度、未来发生破坏性地震事件的可能性和单次事件的平均位移。该文以存在大量活动断裂的实际工程肯尼亚内马铁路Ngong隧道及DK40大桥场地为例,利用相关原则、构造类比原则、安全原则对跨越隧道及大桥场地的活动断裂单次事件潜在断错位移进行了预测,同时也探讨、分析了断裂展布与断裂活动方式、破碎带宽度、未来发生破坏性地震事件的可能性。该实例能够对环太平洋带强震地区跨越活动断裂的线性工程抗断设计参数获取提供参考价值。

摘要：为了提高辊花设计效率,解决传统辊花设计繁琐、修改困难等问题,根据板料弯曲时截面中性层长度不变原理,建立了描述成形截面形状变化的节点坐标映射模型。通过分析辊弯成形时板料弯曲截面圆弧节点坐标的变化规律,以一段圆弧和直线作为板料弯曲的最小体素单元,得出目标截面几何尺寸参数与截面上节点坐标之间的函数关系,并推导出板料以定半径法和定长度法弯曲时,描述对称型截面形状变化的节点坐标计算公式。最后,以8弯角对称截面为例,根据推导的节点坐标计算公式,将断面特征识别转化为断面参数输入,并结合参数化设计思想,编写了基于ABAQUS二次开发的python脚本程序,实现了多种对称型截面辊花图的绘制,并通过尺寸对比,验证了所设计辊花的合理性以及设计方法的可行性。