超微红茶粉的理化性质和抗氧化活性的研究

本文采用超微粉碎技术制备超微红茶粉,研究超微粉碎时间对红茶粉末的显微结构、功能特性、流动性及抗氧化活性的影响。结果表明,超微粉碎改善了红茶的理化性质,增加了功效成分溶出率,提高了其抗氧化活性,其中20 min粉碎时间制得的超微红茶粉理化性质变化显著,30 min粉碎时间制得的超微红茶粉抗氧化活性较强。     

透过亚当斯领略黑白摄影的魅力

在漫长的黑白摄影发展的进程中,摄影大师安塞尔·亚当斯做出了卓越的贡献,尤其是"f64小组"和完善的区域曝光系统成为摄影史上的里程碑。黑、白、灰黑白摄影演绎着影调与影像的经典,即使在现代彩色摄影高度发展的今天,黑白摄影并没有失去它往日的光彩,也不会被彩色摄影所更替,它将以独特的魅力,以单纯、洗练、视觉冲击力强等审美优势继续发展,创造更多视觉财富。     

高校领导决断力探微

决断力就是指高校领导或高校领导团队在高校管理实践中坚决果断地做出决策的能力,是高校领导力体系中的一个重要的组成部分,由高校领导决策能力和勇敢果断的性格品质两大核心内涵构成,并蕴藏其特殊的决断过程——“黑匣效应”。然而,在高校管理实践中,存在高校领导决断力的缺失现象。高校领导可以通过弄清决断过程,优化决策引力;提高分析判...     

Geography, insolation, and vitamin D in nineteenth century US African-American and white statures

Using a new source of nineteenth century US state prison records I contrast the biological living conditions of comparable African-Americans and whites. Although blacks and whites today in the US reach similar terminal statures, nineteenth century African-American statures were consistently shorter than those of whites. Greater insolation (vitamin D production) is shown to be associated with taller black and white statures and a considerable share of the stature difference between US blacks and whites was attributable to insolation and vitamin D production. Black statures increased during the antebellum period, while white statures declined. Black and white statures both decreased after the Civil War. Farmers were taller than workers in other occupations, and an alternative explanation for stature variation by social class is considered.     

“红与黑”:论精神旅游产品的开发向度

红色旅游作为我国精神旅游的主导产品,其主题大多为爱国主义和革命传统教育,存在着主题概念僵化、客源以公费旅游群体为主等问题；而黑色旅游主题则以爱与和平为主,呈现负面事件“正面宣传化”、多元化深度开发不足等问题.鉴于此,文章提出创新我国精神旅游主题的思路,即从阐释美、正义、人性、自由和理性等多维视角重构旅游产品,更好地发挥其对国民的伦理教化作用.     

How broad-based is broad-based black economic empowerment?

Common perceptions about broad-based black economic empowerment (BBBEE) have been that it is nothing more than a tool for the already affluent to access further wealth and has limited potential to address the economic exclusion of the most marginalised. An analysis was conducted of data on black economic empowerment (BEE) deals between 2004 and 2009. The findings demonstrate that although the elite continue to benefit from deals, broad-based beneficiaries, particularly employees and women, are also beginning to benefit to some extent. This suggests that empowerment policies have some potential to promote private sector involvement in addressing the state's social transformation agenda. However, a closer analysis of the BEE transactions shows that the BEE landscape is far more complex and nuanced than commonly thought. Further research is necessary to understand the real impacts of BEE on the ground.     

企业竞争中的“黑洞现象”及其对策探讨

文章针对国际企业竞争中出现的新趋势,即随着全球化进程的加快,资源和市场份额愈来愈集中在少数几个跨国巨头手中,而无论从资金、技术还是管理和人力资源都不是很强的国内企业如何应对,尤其是中国按照加入WTO时所作的承诺将在2005年全面开放市场,国内企业失去了政策保护,将和跨国巨头直接展开厮杀的关头,我们如何提高胜算,本文将对此作一简要分析.     

旧水泥混凝土路面“白加黑”前压浆处治技术

旧水泥混凝土路面加铺沥青层(简称"白加黑")以其良好的使用性能在国内外得到广泛应用,反射裂缝是"白加黑"的主要病害,旧水泥混凝土路面良好的结构强度是控制或延缓反射裂缝发生的基础。对旧水泥混凝土路面采用压浆处治解决板下脱空问题,结合梅河高速公路加铺沥青混凝土工程,对板底脱空原因、压浆加固机理、压浆处治方案、压浆施工工艺及质量控制做了介绍。     

国内外炭黑产需市场现状

本文分述了世界炭黑生产和需求现状和预测、我国炭黑生产和需求现状、我国炭黑生产扩能趋势，以及气相白炭黑的发展前景。     

DC的黑白摄影技巧

因特网上的图像文件的传播使得使用数码相机的数字化摄影得到广泛应用,在众多图像文件中,黑白图像对抽象的美有极强的表现力。本文从数码相机的特点入手,着重阐述了使用数码相机进行黑白摄影的技法,并提出了相关建议。