应用Fortran语言实现Bézier曲线的G2阶连续性拼接

简要介绍了Bezier曲线的定义、性质和Bézier曲线G2阶连续性拼接的方法,并应用Fortran语言编程实现了Bézier曲线G2阶连续性拼接.     

G3帽多工位传递模设计

通过对G3帽多工位模具设计 ,介绍了多工位传递模设计程序 ,各工位的模具特点。该模具包括冲裁、拉伸、成形、切边、冲孔、整形、翻边等多道工序,该模具为类似零件的模具设计起到抛砖引玉的作用     

沙滩玩具杯主体件注射模设计

介绍了沙滩玩具杯主体件注射模设计与工作过程。模具采用热流道浇注系统,推板顶件出模方式,侧边滑块采用滑块套滑块结构,冷却系统采用隔板式冷却水路。生产实践证明,模具结构合理,脱模顺利,塑件质量满足设计要求。     

300t回转式铜精炼炉盖启闭装置及主要参数计算

介绍了炉盖启闭方式的类型，详细阐述了应用液压控制系统驱动炉盖启闭的原理及其主要参数计算。     

旋杯式空调滴水雾化器的研制

介绍了为消除窗式，分体式和柜式空调器滴水现象而研制的旋杯式空调滴水雾化器的结构，工作原理，安装位置及其它特点，认为雾化器不仅可用于空调行业，也可用于喷雾作业。     

流体转杯离心粒化特性试验

 针对高温熔融高炉渣转杯粒化技术,为了探索离心粒化过程中熔渣颗粒形成的机理及熔渣体流量、转杯转动速度等参数对颗粒粒径的影响,以水为粒化试验工质,以直径110 mm的转杯为离心粒化器,开展了离心粒化可视化试验。研究了工质在转杯表面的流动和在转杯边缘形成液丝、液丝断裂成液滴的机理,以及液丝长度、顶端液滴粒径随时间的变化趋势;基于图像处理技术分析了转杯转速、工质流量对粒化液滴的粒径分布和平均粒径的影响规律。结果表明：转杯表面液膜在转杯边缘形成若干凸起,并沿转杯运动的切线方向延伸形成液丝,液丝长度随时间呈线性变化关系,液丝顶端液滴粒径基本保持不变;随着工质流量降低和转杯转速升高,液滴平均粒径呈减小趋势,液滴速度接近转杯圆周速度。     

Farm to Consumer: Factors Affecting the Organoleptic Characteristics of Coffee. II: Postharvest Processing Factors

The production and consumption of coffee are increasing despite the roadblocks to its agriculture and global trade. The unique, refreshing, and stimulating final cupping quality of coffee is the only reason for this rising production and consumption. Coffee quality is a multifaceted trait and is inevitably influenced by the way it is successively processed after harvesting. Reportedly, 60% of the quality attributes of coffee are governed by postharvest processing. The current review elaborates and establishes for the first time the relationship between different methods of postharvest processing of coffee and its varying organoleptic and sensory quality attributes. In view of the proven significance of each processing step, this review has been subdivided into three sections, secondary processing, primary processing, and postprocessing variables. Secondary processing addresses the immediate processing steps on the farm after harvest and storage before roasting. The primary processing section adheres specifically to roasting, grinding and brewing/extraction, topics which have been technically addressed more than any others in the literature and by industry. The postprocessing attribute section deals generally with interaction of the consumer with products of different visual appearance. Finally, there are still some bottlenecks which need to be addressed, not only to completely understand the relationship of varying postharvest processing methods with varying in‐cup quality attributes, but also to devise the next generation of coffee processing technologies.     

Rayleigh-Bénard对流的相干结构及其对多分形指数的影响

首先利用子波(Wavelet)WTMM理论对Rayleigh-Bénard(R-B)对流温度信号的多分形特性进行了分析,然后采用本文给出的子波反演公式,不加入任何门限地提取了该信号的相干结构。在此基础上,通过对本文定义的一个非相干结构信号的分形特性研究,来反映出相干结构对多分形特性的影响。研究结果表明:代表大尺度运动的相干结构对小尺度上体现出来的多分形谱D(h)几乎没有影响,在这个意义上讲,分形谱D(h)具有不变性。     

包钢某座高炉陶瓷杯侵蚀模型研究

以炉缸埋设的热电偶测量数据为依据, 采用有限元法建立炉缸侵蚀数学模型, 构造带有移动内边界的有限元模型和侵蚀计算流程。由于侵蚀边界的未知性, 计算中必须先假定一个边界, 再根据测温数据来移动边界, 实现循环计算。建立了一种二维有限元搜索内衬侵蚀的自动逼近计算方法, 解决了相关技术难点, 开发了完整的计算程序, 从而实现了高炉炉缸内衬侵蚀的计算由一维技术向二维技术的突破。通过包钢某座高炉在线运行, 侵蚀线和渣铁线的确定, 真实地反映了炉内情况, 为侵蚀模型指导高炉生产奠定了基础。     

芦笋皮乙醇提取物的抑菌活性研究

研究芦笋皮乙醇提取物对金黄色葡萄球菌、大肠杆菌、枯草芽孢杆菌、志贺氏菌、沙门氏菌和青霉、毛霉、黑曲霉的抑制作用,采用牛津杯法对不同质量浓度的芦笋皮乙醇提取物进行抑菌实验。结果表明：芦笋皮乙醇提取物对细菌和霉菌均有抑制作用,抑制细菌的能力明显强于霉菌;对金黄色葡萄球菌最低抑制质量浓度为1g/100mL,其余4 种细菌均为5g/100mL,且随着质量浓度的增大抑菌作用增强;对青霉、毛霉、黑曲霉的最低抑制质量浓度分别为10、30、40g/100mL。