8步掌控你的新单反

新年新气象,你有没有打算给自己购置一台全新的数码单反相机呢？在这篇文章中。Ed Godden将告诉你如何才能发挥出你的新相机的全部潜能。     

动起来!

<正>春天来了,天气暖了,别再窝在屋里,拿起相机去拍照吧!下面这些简单的技术与技巧,可以帮助你用数码单反相机凝固下富有戏剧效果的运动画面。和小数码相机相比,数码单反相机在捕捉运动场景时享有得天独厚的优势。我们不可能像顶尖的职业体育摄影师那样在机身和镜头上撒下大把银子,但即便只有一台便宜的入门级数码单反相机和55-250mm、70-300mm这样的低端镜头,我们同样能在各种运动场合大显身手:从机车比赛到马术表演,从拍摄田径比赛到抓拍野生动物。     

动起来！

春天来了,天气暖了,别再窝在屋里,拿起相机去拍照吧！下面这些简单的技术与技巧,可以帮助你用数码单反相机凝固下富有戏剧效果的运动画面。     

单反专用闪光灯

如果你想为自己的数码单反相机买一支闪光灯,不要只考虑原厂闪光灯,还有很多高性价比的选择方案,我们的编辑为你选择了包括原厂闪光灯在内的6款闪光灯,下面就跟随文章来看看它们的表现吧。     

单反新生力索尼数码单反相机α200发布会

当2006年索尼首次介入数码单反市场,并推出首款产品α100至今,不过短短一年多时间。2008年1月7日,北京嘉里中心,索尼的α200能带给我们多大惊喜呢?发布会以索尼消费电子营业本部总裁关口直树先生和索尼α单反高级部长胜本徹先生的致辞开始,而随着他们为α200揭幕,这款2008年的数码单反“排头兵“正式亮相。     

用普通单反拍出专业效果

想拍出最顶尖的摄影作品,你并不需要专业级数码单反相机。拍出好照片的关键不在于相机,而在于你的观察方法和技巧运用。我们将会告诉你如何把手中的器材发挥到最大限度!     

用普通单反拍出专业效果

想拍出最顶尖的摄影作品,你并不需要专业级数码单反相机。拍出好照片的关键不在于相机,而在于你的观察方法和技巧运用。我们将会告诉你如何把手中的器材发挥到最大限度!     

快速入门，6步玩转数码单反相机

被测光难住了？对曝光感到困惑？阅读以下实用速成指南,拍摄更好的照片……这里,我们讲述了一些使用相机时可能会有疑惑的设置问题,集中于测光和曝光,两个我们被反复要求提供建议的方面。另外,我们也准备了一些分析照片的简便技巧。为了开始这场破解相机功能之旅,我们首先插入一些你必须知道的基本设置知识,以助于更好地利用它们。     

中高端数码单反相机

中、高端数码单反相机的价格和重量都在不断下降,拥有更加强大的功能和更人性化的设计。     

中端单反的王者风范 尼康D7000数码单反相机

在众多摄影爱好者的盼望和猜想中,尼康终于揭开了D7000的面纱。尼康迷们对它的表现充满期待,不要再观望了,让我们带你近距离感受D7000的实力吧。     

数码影像技巧100条

<正>在下面的文章中,英国特约作者Chris Gatcum与我们分享了他自己的100个摄影技巧,这些技巧会让你的照片发生巨大的变化。找到拍摄灵感01首先,也是你要考虑的最重要的问题——灵感。有时候我们会觉得没什么可拍的东西,或现场条件太差,不可能进行拍摄。如果拍风景时天气不好,或     

母盘制作新方向

一种新的需求在推动光存储格式科技的发展,一场创新的革命即将来临。     

一种新型多功能阻燃母料

本文介绍一种多功能塑料阻燃母料的研究及其在ＨＩＰＳ，ＡＢＳ，ＰＰ，ＰＥ中的应用。考察了这种母料对基体性能的影响，同时考察了其对基体流变性能和热稳定性能的影响。结果表明，阻燃复合体系不但具有优异的阻燃性能，而且兼有良好的抗静电性，着色性，热稳定性和加工性等功能，具有较大的实用价值。     

A New Scheme of Finding the Master Sintering Curve

The master sintering curve approach represents densification data in terms of a master variable that combines sintering time and temperature. Recently, a finite-element scheme to predict sintering deformation that requires only the master sintering curve instead of a full constitutive law as the input data has been developed. Here, a modification to the original master sintering curve approach, so that it is more suitable for finite-element analysis, is presented. Finite-element shape functions are used to represent the densification data as well as the master sintering curve. This approach confers extra flexibility to the master sintering curve approach, even when it is not used with finite-element analysis. For example, by using shape functions, a varying activation energy can be used to obtain a master sintering curve for a set of densification data that cannot be fitted using a constant activation energy.     

Interrogating the Tailoring Steps of Pactamycin Biosynthesis and Accessing New Pactamycin Analogues

Pactamycin is a bacteria‐derived aminocyclitol antibiotic with a wide‐range of biological activity. Its chemical structure and potent biological activities have made it an interesting lead compound for drug discovery and development. Despite its unusual chemical structure, many aspects of its formation in nature remain elusive. Using a combination of genetic inactivation and metabolic analysis, we investigated the tailoring processes of pactamycin biosynthesis in Streptomyces pactum. The results provide insights into the sequence of events during the tailoring steps of pactamycin biosynthesis and explain the unusual production of various pactamycin analogues by S. pactum mutants. We also identified two new pactamycin analogues that have better selectivity indexes than pactamycin against malarial parasites.     

New Insights into the Glycosylation Steps in the Biosynthesis of Sch47554 and Sch47555

Sch47554 and Sch47555 are antifungal compounds from Streptomyces sp. SCC‐2136. The availability of the biosynthetic gene cluster made it possible to track genes that encode biosynthetic enzymes responsible for the structural features of these two angucyclines. Sugar moieties play important roles in the biological activities of many natural products. An investigation into glycosyltransferases (GTs) might potentially help to diversify pharmaceutically significant drugs through combinatorial biosynthesis. Sequence analysis indicates that SchS7 is a putative C‐GT, whereas SchS9 and SchS10 are proposed to be O‐GTs. In this study, the roles of these three GTs in the biosynthesis of Sch47554 and Sch47555 are characterized. Coexpression of the aglycone and sugar biosynthetic genes with schS7 in Streptomyces lividans K4 resulted in the production of C‐glycosylated rabelomycin, which revealed that SchS7 attached a d ‐amicetose moiety to the aglycone core structure at the C‐9 position. Gene inactivation studies revealed that subsequent glycosylation steps took place in a sequential manner, in which SchS9 first attached either an l ‐aculose or l ‐amicetose moiety to 4′‐OH of the C‐glycosylated aglycone, then SchS10 transferred an l ‐aculose moiety to 3‐OH of the angucycline core.     

新形势下工程硕士研究生课程建设的几点思考

当今社会急需具有工程创新能力的高水平应用型人才,因此关于工程硕士专业学位教育的研究受到人们越来越多的关注。针对工程硕士的特点及传统课程教学存在的一些问题,文章以化学工程领域的核心课程高等分离工程为例,提出了相应的解决方案,希望借此推动工程硕士的课程建设,提高工程硕士研究生培养的整体水平。     

Reaction-Rate-Limiting Steps in Carbothermal Reduction Processes

The production of β-sialon (Si3A1303N5) and nonoxidic powders by carbothermal reduction of oxides is discussed. Special attention is paid to the rate-determining steps in the conversion process performed in a packed-bed reactor. It is shown that powders with specific surface area >10 m²/g can be produced by the correct choice of pellet size, gas flow rate, temperature, and raw material.