历史一再证明： “ 没有调查，就没有发言权 ”， “不做正确的调查，同样没有发言权。” 必须谨 慎 使 用 “ H-指数 （H-index）” 刚才看到 noreply@natureasia.com 发来的邮件，主题是“ h-index inventor tells where it went wrong， h-index 发明者说它被用错了 ”。 善良的 Jorge Hirsch 教授，2005年提出“ H-指数（H-index） ” https://www.natureindex.com/news-blog/whats-wrong-with-the-h-index-according-to-its-inventor Jorge Eduardo Hirsch，University of California, San Diego https://jorge.physics.ucsd.edu/jh.html 主要结论： “One has to look at the nature of the work,” says Hirsch. “If you make decisions just based on someone’s H-index, you can end up hiring the wrong person or denying a grant to someone who is much more likely to do something important. It has to be used carefully.” 赫希说：“必须看一下工作的实质。”“如果仅根据某人的H指数做出决定，您最终可能会雇用错误的人，或者拒绝向更有可能做重要事情的人提供资助。必须谨慎使用。” 感谢您的指教！ 感谢您指正以上任何错误！ 感谢您提供更多的相关资料！
What's wrong with Applied Mechanics? Suo Z.G. (Originallyposted on Applied Mechanics News in 16 May 2006) Applied Mechanics is a discipline that studies the response of matterto external forces, such as flow of a liquid, fracture of a solid, sound in theair, and vibration of a string. Applied Mechanics bridges the gap betweenfundamental physical sciences and wide-ranging applications. Representivequestions are how a gecko climbs, how an earthquake occurs, how acomputer chip fails, how an airplane flies, or how the TwinTowers fell. Major approaches include formulating concepts and theories,discovering and interpreting phenomena, as well as developing experimental andcomputational tools. For well over a century, Applied Mechanics has been a flagship discipline in the innovation of research, education, and community building inmany branches of engineering, including Mechanical Engineering, CivilEngineering, Aerospace Engineering, Materials Engineering, and Bioengineering. Despite the intellectual depth and practical utility , the discipline of AppliedMechanics is in a state of crisis, largely due to its own success. Like manysophisticated fields of science and engineering, Applied Mechanics constitutesa large chunk of knowledge, accumulated over millennia, represented by texts,equations, graphics, photos, audios, videos. This large quantity of knowledgehas made it hard for any individual to master (and to add to) the field, a factat least partially responsible for turning many talented young people away fromthe field. However, nobody has ever questioned the immense value of AppliedMechanics to a broad range of human activities today and to our posterity.Furthermore, new problems constantly emerge that requires ingenious use ofexisting knowledge, or fundamental progress in Applied Mechanics. Still, thequestion remains, how do we impart this large chunk of knowledge to individualswithin a reasonable amount of time, so that they still have time left toinnovate? A classical answer to this question dates back at least to Stephen P.Timoshenko, considered by many the father of modern Applied Mechanics. Startingearly last century, Timoshenko and his followers divided the field of AppliedMechanics into subfields(such as strength of materials, theory of elasticity,theory of vibration, plates and shells, structural instabilities), and thensummarized the essential knowledge in each subfield in a textbook. Thesuccess of this divide-and-conquer approach is immense, as attested by therising importance of Applied Mechanics in engineering curriculum, by thefundamental progress (e.g., in fracture mechanics and in nonlinear continuummechanics), and by pervasive use of Applied Mechanics in engineeringpractice. This approach, however, is not scalable. As more results accumulate ina subfield, its textbook becomes thicker and more abstruse. As new subfieldsemerge, new textbooks are added to the pile. Furthermore, what is consideredessential knowledge for a practicing engineer is very different from that foran undergraduate student. This and other idiosyncrasies of people lead to moretextbooks, each with smaller audience. Individuals agonize over which cherries to pick, leaving most fruits untasted. Sadly, few mechanicians today consider writingtextbooks professionally rewarding. Sadder still, the approach has led thediscipline to fragment. The fragmentation has been partially mitigated by the rise ofcomputational mechanics. Over the last half century or so, the use of computerto solve complex, nonlinear boundary-value problems in the field of Applied Mechanicshas flourished, leading to commercial software like ABAQUS. Using suchsoftware, an electrical engineer, say, with a rudimentary understanding ofmechanics, can analyze the strain field in the channel of a transistor. Whilecomputational mechanics has begun to unify Applied Mechanics, this unificationis incomplete. For one, not all problems are suitable for numericalcomputation; many problems are solved by experiments combined with scalinglaws, and by relating to previously solved problems. Some problems are solvedmore sensibly by trial and error. (Nobody learns to ride a bicycle by numericalsimulation.) Also, to make a fundamental contribution to Applied Mechanics, onehas to go beneath software and acquire a holistic understanding of the field. I believe that the Internet will further unify Applied Mechanics bygoing beyond numerical computational aspects of mechanics, by making the laborof discovering and synthesizing knowledge more efficient and meaningful, and bymaking Applied Mechanics useful to more people. 应用力学是研究物质在外力下响应的学科，例如流体的流动，固体的破坏，空气中的声音，弦的振动。应用力学是消除基础物理和应用科学之间隔阂的桥梁。具有代表性的问题是，壁虎是怎样攀爬的，地震是怎样发生的，电子是芯片是怎样损坏的，飞机是怎样飞行的，或者是双子塔是怎样倒塌的。主要的研究方法包括形成一个概念和理论的范式 (formulation) ，发现和解释现象，以及发展实验和计算工具。一个世纪以来，应用力学已经成为标本式学科，包括：研究的创新、教育，以及在许多工程分支中的建设性作用，包括机械工程、土木工程、航空工程、材料工程以及生物工程。 尽管拥有知识深度和工程实用性，但是应用力学学科处于由于自身成功而带来的危机之中。与许多复杂的科学和工程领域一样，应用力学构成了一个巨大的知识结构，积累了数以百万的成果，以文字、方程、图表、图像、音频、录像而表现。这些巨大的知识使得很难让任何某个个体完全掌握这个领域，至少应该为许多年轻的天才离开这个领域而负一些责任。然而没有人会怀疑应用力学在扩大人类活动范围和蒙阴子孙后代所带来的巨大价值。此外，新的问题不断出现，需要利用已有的知识进行有独创性的或者是基础性的进步。然而，问题是我们如何将这广袤无边的知识在有限的时间里传授给某个个体，以至于他仍有足够的时间去进行创造性的工作？ 追溯到铁摩辛柯的经典的回答，他被认为是现代应用力学之父。上个世纪初，铁摩辛柯和他的追随者们将应用力学分为了几个子领域 ( 例如材料强度、弹性理论、振动理论、板壳理论、结构失稳 ) ，并且在教科书中总结了这些领域的“基本知识”。他这种分而治之的思想的成功是巨大的，应用力学在工程中逐渐表现出的重要性、以及基础理论的进步 ( 例如断裂力学、非线性连续介质力学 ) ，表明他的这种方法是没有错误的，并且在工程中已经广泛普及。 然而，这种方法是不可被广泛推广的。随着各个子领域越来越多的积累，教科书将变得越来越厚、艰深难懂。当又一个新领域出现时，教科书也要相应的增加。此外 (In addition/Furthemore) ，对于工程实践来说被认为是重要的知识不同于本科生所掌握的知识。这些或者其它的个人喜好导致更多的教材每一部分只有一小部分的读者。个人的极度痛苦超过了只选择自己感兴趣的樱桃，而忽视了其它的水果。悲哀的是，只有一小部分力学工作者认为撰写教科书是有意义的。更悲哀的是，这逐渐使这门学科支离破碎。 计算力学的兴起使得这种支离破碎的局面有所缓和。大约在上世纪中期，在应用力学领域兴起了应用计算机解决复杂的非线性边值问题，导致了如 ABAQUS 的商业软件的产生。运用这种软件，电气工程师，或者说只是具备基本力学知识的人，都可以分析晶体管通道的应变场。尽管计算力学开始统一应用力学，但是这个统一是不完全的。其一，不是所有的问题都适合于数值计算，许多问题通过实验在标度律的基础上来解决，以及通过与先前的已经求解过的问题相联系。一些问题也通过反复的试验不断摸索而解决 ( 没有人通过数值模拟来学骑自行车 ) 。当然，为了给应用力学做出基础性的贡献，必须放下软件，以对整个领域有全面而深入的了解。 我相信互联网将在力学方面超越数值计算而将应用力学进一步统一，通过互联网这个实验室发现、集合知识，将更有效率更有意义，并且使得应用力学对人们更有意义。
I know that sometimes I have to take a rain check even from you. However, I don't like to get a wrong gift. I wanted to see movie "Lincoln," not " Abraham Lincoln: Vampire Hunte r ." Well, since it's a 3D, I will have to just watch it. Maybe it's time for you to hire a younger mind for the job? ps. I know the gingerbread men I left out for you this year were so great. It's all this gluten-free non-sense. I will find you better ones next year.
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