摘要：相变诱发塑性(TRIP)效应通常可显著提高中锰钢的加工硬化能力,从而获得出色的强度和塑性组合.然而,变形过程中生成的新鲜马氏体极易发生氢脆,是新型高强中锰钢开发的瓶颈问题.我们在此提出了一种长带状形貌来减轻新鲜马氏体引起的氢脆.温轧制备的长带状中锰钢相比传统临界退火制备的等轴晶形貌中锰钢,不仅具有同等的高加工硬化率,而且抗氢脆性能更好.等轴晶形貌中锰钢由于缺乏有效的阻碍机制,氢裂纹一旦出现便能快速扩展.相反,对于长带状形貌中锰钢,氢裂纹会被晶界和相界所阻碍或偏转.本形貌设计可以提高其他富TRIP效应的钢和合金的抗氢脆性能.

摘要：Nowadays, genome editing tools are indispensable for studying gene function in order to increase our knowledge of biochemical processes and disease mechanisms. The extensive availability of mutagenesis and transgenesis tools make Drosophila melanogaster an excellent model organism for geneticists. Early mutagenesis tools relied on chemical or physical methods,ethyl methane sulfonate(EMS) and X-rays respectively, to randomly alter DNA at a nucleotide or chromosomal level. Since the discovery of transposable elements and the availability of the complete fly genome, specific genome editing tools, such as P-elements, zinc-finger nucleases(ZFNs) and transcription activator-like effector nucleases(TALENs), have undergone rapid development. Currently, one of the leading and most effective contemporary tools is the CRISPR-cas9 system made popular because of its low cost, effectiveness, specificity and simplicity of use. This review briefly addresses the most commonly used mutagenesis and transgenesis tools in Drosophila, followed by an in-depth review of the multipurpose CRISPR-Cas9 system and its current applications.

摘要：Scratch is a visual programming tools that is widely used in many lessons. While many of the lessons use thecoding features of Scratch, teachers may also use the interactive features in their lessons. In a course for in-serviceprimary school teachers, on the use of technology for the school-based learning and teaching, teachers had anexperience on how Scratch can be used to facilitate learning. Starting from no programming history, teachers spent3 hours each on 4 topics including Take-Away Model, The Four Operations, Divisibilities, and Area of SimpleFigures, via step-by-step procedures on setting up animations within the theme that would attract students, and withthe interaction responses such as text and sound, they successfully handled the use of Scratch and could design andmake their lessons perfectly to their students. While teachers suggest learning should be extended to the second andthe third classroom, with this easy-to-learn programming language, teachers could now facilitate learning ofstudents by the attractive school-based games, which focus on particular topics the teachers had selected.

摘要：We investigated the structural behavior and bearing capacity of system *** research showed that the critical load of a system scaffold structure without diagonal braces is similar to that of a door-shaped steel scaffold *** stiffness between vertical props in system scaffolds can be defined based on a comparison between analytical and experimental *** the number of scaffold stories increases,the critical loads of system scaffolds *** braces markedly enhance the critical load of system *** coupling joint position between vertical props should be kept away from story-to-story joints to prevent a reduction in critical *** critical load of a system scaffold decreases as the quantity of extended vertical props at the bottom of the structure increases.A large Christmas tree set up by system scaffolds under various loads was used as an example for analysis and to check the design of system scaffolds.

摘要：Woman as a political trope had been essential to the Chinese Communist Party’s state vision of socialist modernization after the establishment of the People’s Republic of China in *** Party valued women’s labor and devoted to emancipating it from the domestic realm so that women could be mobilized to actively participate in the collective socialist *** the figure of women with modernity is not an unprecedented strategy,for during the early twentieth century the“Modern Girl”embodying the essence of Chinese modernity had already become a conspicuous cultural icon in various kinds of visual cultural *** paper investigates the ways in which females’public visual images were consciously constructed in the two different historical periods in order to cater to particular political or commercial *** argues that while those images objectively capture the reality of social modernity to some extents,they also imply the artists’imaginary of an ideal vision of *** registering female figures as the center for presentation,they were inscribed with males’desires through envisioning desirable female images that would correspond to their expectations of the concreteness of modernity.

摘要：Broadband sound sink/absorber via a structure with deep sub-wavelength thickness is of great and continuing interest in physics and engineering *** intuitive technique extensively used is to combine components(resonators)with quasi-perfect absorption to piece together a broad absorbing band,but the requirement of quasi-perfect absorption substantially places a very strict restriction on the impedance and thickness of the ***,we theoretically and experimentally demonstrate that a compact broadband acoustic sink that quasi-perfectly absorbs broadband arriving sound waves can be achieved with coherently coupled‘‘weak resonances"(resonant sound absorbing systems with low absorption peaks).Although each component exhibits rather low absorption peak alone,via manipulating the coherent coupling effect among the components,they collectively provide a remarkably improved performance over a wide frequency range with a significantly compressed *** illustrate the design principle,a hybrid metasurface utilizing the coaction of parallel and cascade couplings is presented,which possesses an average absorption coefficient of 0.957 in the quasi-perfect band(a>0:9)from 870 to 3224 Hz with a thickness of only 3.9 *** results open new avenues for the development of novel and highly efficient acoustic absorbers against low frequency noise,and more essentially,suggest an efficient approach towards on-demand acoustic impedance engineering in broadband.

摘要：Engineered cementitious composite(ECC)is a class of high performance cementitious composites with pseudo strain-hardening behavior and excellent crack control *** of concrete with ECC can largely reduce the cracking and durability problems associated with brittleness of *** this paper,a simplified constitutive model of the ECC material was applied to simulate the flexural behaviors of the steel reinforced ECC and ECC/concrete composite beams with finite element *** simulation results are found to be in good agreement with test results,indicating that the finite element model is reasonably accurate in simulating the flexural behaviors of the steel reinforced ECC flexural *** effects of the ECC modulus,ECC tensile ductility,ECC thickness and ECC position on flexural behaviors in terms of ultimate moment,deflection and the maximum crack width of the steel reinforced ECC or ECC/concrete composite beam are hence evaluated.

摘要：As an important means of cultural transmission,documentaries are a powerful tool to make known the five thousand years of Chinese civilization to people all over the ***“Wild China”of BBC version,popular among the great majority of overseas audience,serves as a successful carrier of Chinese culture *** on the theory of low-context and high-context culture,this paper uses the method of text analysis and focuses on the study of the texts in the Chinese and English versions of“Wild China”and explores the differences in the texts in terms of content and *** purpose of this study is to avoid cultural misunderstanding and optimize communication *** of this study show that against the background of low-context(English)and high-context(Chinese)culture,the English version has a good sense of rhythm,uses rhetoric for vivid description,expresses ideas directly,and provides explanation for phenomena through narrating or telling a *** Chinese version has plainer descriptions,uses more euphemistic or abstract words,analyzes phenomena in less detail and narrates more ***,it is suggested that in translating texts into English,concepts need to be made accessible,logical and direct with more explanation,more rhetoric,more objective evaluation,and less pursuit of artistic *** communication strategies conforming to low-context culture can help overseas audience accept Chinese culture more easily.

摘要：Bromination is used as a strategy to improve biological activity in medicinal *** order to study on the structure-activity relationships of the novel acetylcholinesterase inhibitors with 7H-thiazolo[3,2-b]-1,2,4-triazin-7-one scaffold,based on our previous work and molecular modeling,a series of novel 3-aryl-6-（bromoarylrnethyl）-7H-thiazolo[3,2-b]-1,2,4-triazin-7-one derivatives were designed by molecular docking,synthesized and characterized by mass spectra,infrared spectra,proton NMR and elemental *** study of AChE inhibitory activity was carried out using the Ellman colorimetric assay with huperzine-A as the positive *** of all target compounds exhibited more than 45%inhibition at 10μmol/*** preliminary structureactivity relationship was the bromine atoms and the hydroxyl group at the phenyl ring at the C6 position of the parent nucleus played significant roles in the AChE inhibitory activity of the target compounds.

摘要：Lai Guolong’s book is a new attempt at understanding early Chinese religion by integrating archaeological, art historical, anthropological, philological, and historical methods. Lai has successfully demonstrated that careful rereading of artifacts and texts from excavations, as well as received texts, supported by balanced use of comparative materials from other cultures and anthropological and religious theories.