摘要：采用Aspen Plus模拟软件对天然气乙烷回收系统建立了模拟模型,并对脱乙烷塔和液化气塔进行了灵敏度分析,考察了进料位置对产品质量与再沸器热负荷的影响。结果表明:随着进料位置的下移,脱乙烷塔塔顶产品中乙烷的摩尔分率呈倒U形变化,塔底产品中乙烷的摩尔分率和再沸器热负荷呈U形变化,脱乙烷塔最适宜的进料位置为第17块塔板上方;随着进料位置的下移,液化气塔再沸器热负荷呈U形变化,塔底异戊烷和正戊烷的摩尔分率均呈倒U形变化,而塔顶产品中丙烷的摩尔分率逐渐减小,液化气塔最适宜进料板位置为第8~10块塔板。

摘要：Water-coupled charge blasting is a promising technique to efficiently break rock *** this study,numerical models of double boreholes with water-coupled charge are established using LS-DYNA and are calibrated by the tests of rock masses subjected to explosion loads to examine its *** crack levels of rock mass induced by water-coupled charge blasting and air-coupled charge blasting are first *** is found that water-coupled charge blasting is more appropriate to fracture deep rock mass than air-coupled charge *** addition,the effects of rock properties,water-coupled charge coefficients,and borehole connection angles on the performance of water-coupled charge blasting are *** results show that rock properties and water-coupled charge coefficients can greatly influence the crack and fragmentation levels of rock mass induced by water-coupled charge blasting under uniform and non-uniform in-situ ***,changing borehole-connection angles can only affect crack and fragmentation levels of rock mass under non-uniform in-situ stresses but barely affect those under uniform in-situ stresses.A formula is finally proposed by considering the above-mentioned factors to provide the design suggestion of water-coupled charge blasting to fracture rock mass with different in-situ stresses.

摘要：在社会不断发展与进步的时代背景下,中华优秀传统文化得到了进一步的弘扬与创新。汉字是我国悠久历史文化的象征,很大程度上能将不同时期的文化及人文特色表现出来。在现代化的信息设计背景下,加强对汉字艺术的可视化研究是非常有必要的。基于此,文章从信息设计视角出发,研究汉字艺术的基本特征、汉字艺术可视化的发展趋势、汉字艺术可视化设计策略,以期助推汉字艺术在新的时代背景下焕发新的活力。

摘要：在精神文明需求日益高涨的今天,汉字艺术与人文生活的融合越来越紧密,在运用领域和场景上都有着非常广泛的空间,而汉字艺术作为基于汉字基础之上的一种新的视觉艺术,是对中国传统文化的现代转化。要做到汉字艺术与高校艺术设计教育二者的有机融合,需要对汉字艺术概念有一个清晰的认知,在实践过程中理解汉字艺术文化性、传情性、多元性和创新性4个层面的特点与内涵。再者,联系当下实际的境遇分析汉字艺术融入高校艺术设计教育中存在的一些难题,并针对性地提出可行路径,对于传承中国传统文化有着重要意义,也符合习近平总书记在学校教师座谈会上强调“要引导学生增强文化自信”的教学思路。

摘要：红外隐身与可见光隐身对光谱响应的诉求不同,导致两者功能耦合材料设计难以调和,因此发展光学特征选择性调控技术至关重要.基于FTO/Ag/FTO堆叠膜层结构提出一种可见光与红外兼容隐身超构薄膜,建立可见光高透射与红外低辐射一体化协同设计方法,诠释微结构特征对可见光透射光谱与红外反射光谱的影响机制,进而优化设计高透明红外隐身薄膜,并对其兼容性隐身性能测试表征.研究表明,可见光透射取决于半导体介质层与金属层耦合匹配作用,而红外辐射抑制主要取决于金属层.经优化设计的FTO/Ag/FTO膜层结构厚度为40/12/40 nm时,具备高水平的背景透视复现与高温红外辐射抑制能力.该研究可为可见光与红外兼容隐身材料设计及应用提供新途径.

摘要：The flammability of thermoplastic polyesters and the subsequent heavy smoke and severe melt drips formed after ignition are the main obstacles hindering their widespread application. In this study, a novel ionic monomer containing sulfonate and benzimidazole was synthesized and incorporated into the main chain of poly(ethylene terephthalate)(PET, used as a model thermoplastic polyester) by melt copolymerization. The synergetic effect of ionic aggregation and carbonization endowed the obtained copolyester with high melt viscosity and excellent char-forming ability at high temperatures. The copolyester having a monomer content of 8 mol.% easily achieved the Underwriters Laboratories Inc 94(UL-94) V-0 flammability rating without dripping and the limiting oxygen index value reached 33.0 vol.%.In addition, the total smoke production, peak heat release rate,and maximum CO production decreased by 45.2%, 60.5%, and75.0%, respectively, compared with those of PET. In addition,the copolyester was spinnable, and showed greater adsorption efficiency(99.6%) for a cationic dye from solution compared to PET(6.5%), demonstrating the excellent affinity of the copolyester for the cationic dye. The obtained inherently firesafe PET copolyester has great potential for applications in flame retardant textiles, artwork base materials, and decorative materials for transportation applications.

摘要：目的在“三叶虫”化石图像符号元素的形成-提取-转化-运用这一路径中,形成独特的装饰图案,并将这一图案元素运用在现代陶艺装饰创作中。方法运用图像学、符号学、田野考察的研究方法,使非再生资源得以“活态化”传承与发展。结果探讨在现代陶艺创作中,如何将“三叶虫”化石图像符号作为装饰技法与艺术表达相互融合,从而产生内在的关联,从技艺层面,分析三叶虫化石图像符号转化的表达方法路径;从艺术层面,探寻如何塑造两者装饰设计表达的兼容性、艺术性;从实践案例层面,通过对三叶虫化石进行田野考察,获取关于其形象和结构素材的信息,将这一素材进行艺术升华创作,分析创作过程,再对个案艺术家的陶艺作品创作形式进行分析,得出不同的创作语言表达路径;从价值层面,分析三叶虫化石图像符号与现代陶艺的创作路径,从而得出物质与精神高度统一的价值取向。结论得出延续现代陶艺传统技艺的创新表达方式,从而保护非再生资源,避免生态资源过度挖掘。

摘要：针对小天体探测任务对离子推力器设计要求,完成总体方案设计,开展了四极环形磁钢会切场放电室和凸面三栅变孔径栅极设计,采用试验研究和理论分析的方法研究了放电室、栅极设计的合理性及匹配性,试验结果表明:多模式离子推力器实现了宽范围稳定放电和引出,在277—3120 W功率下,推力从9.9 mN线性增加到117.2 mN,比冲从1269s台阶上升到3492 s,束流发散角从30.7°下降到26.8°并趋于稳定,各工作点矢量偏角小于1.5°,束流平直度大于0.75,栅极稳定化处理是控制栅间距一致性的重要方法,采用应力释放钼安装环热设计后栅极间距极差得到有效控制,最大下降百分比为90%,本研究为离子推力器多模式化设计及在轨应用工程研制提供参考.

摘要：目的 解决传统超材料吸波结构密度大以及对入射角度敏感的问题。方法 采用机械搅拌法和熔融共混法制备碳纳米管/聚乳酸(CNTs/PLA)复合吸波材料,通过CST电磁仿真软件开展多层超材料吸波结构设计,利用熔融沉积3D打印制备了设计的超材料吸波结构。通过扫描电子显微镜、矢量网络分析仪对制备材料和设计结构的微观形貌和电磁特性进行表征分析。结果 在机械搅拌和熔融共混的共同作用下,碳纳米管在聚乳酸中分布均匀。碳纳米管含量为10%时,复合材料的综合性能达到最佳。当其厚度为1.7 mm时,有效带宽达到最大为3.9 GHz;当厚度为3.2 mm时,反射率达到最低值约为–53.1 dB。设计的多层超材料吸波结构均具有极佳的宽频吸波特性;当R=11 mm时,圆形多层超材料结构的吸波性能最佳,反射率最低值为–53.9 dB,有效带宽为33.1 GHz,而平均反射率为–17.1 dB。此外对于TE极化的电磁波入射角在0°~60°范围内,而对于TM极化电磁波在入射角0°~70°范围内,圆形多层超材料结构具有宽角域吸波性能。结论 将碳纳米管与聚乳酸复合,在此基础上开展多层超材料结构设计,通过微观复合材料和宏观结构设计的共同作用,实现了轻质宽频的应用需求,能够为超材料吸波结构的设计及工程应用提供理论和技术支撑。

摘要：Estimation of support pressure is extremely important to the support system design and the construction safety of *** present,there are many methods for the estimation of support pressure based on different rock mass classification systems,such as Q system,GSI system and RMR ***,various rock mass classification systems are based on different tunnel geologic conditions in various ***,each rock mass classification system has a certain *** China,the BQ-Inex(BQ system)has been widely used in the field of rock engineering ever since its ***,there is still no estimation method of support pressure with BQ-index as *** on the field test data from 54 tunnels in China,a new empirical method considering BQ-Inex,tunnel span and rock weight is proposed to estimate the support pressure using multiple nonlinear regression analysis *** then the significance and necessity of support pressure estimation method for the safety of tunnel construction in China is explained through the comparison and analysis with the existing internationally widely used support pressure estimation methods of RMR system,Q system and GSI ***,the empirical method of estimating the support pressure based on BQ-index was applied to designing the support system in the China’s high-speed railway tunnel—Zhengwan high-speed railway and the rationality of this method has been verified through the data of field test.