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Pressure-dependent phase transition of 2D layered silicon telluride(Si2le3)and manganese intercalated silicon telluride

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Nano Research 2019年第9期12卷 2373-2377页

作者： Virginia L. johnson Auddy Anilao Kristie J. Koski Department of Chemistry University of CaliforniaDavisDavisCA 95616USA

Two-dimensional(2D)layered silicon telluride(SizTes)nanocrystals were compressed to 12 GPa using diamond anvil cell *** measurements show a color change from transparent red to opaque black indicating a semiconductor-to-metal phase *** scattering was used to observe the stiffening of the crystal lattice and subsequent phase behavior.A possible phase transition was *** 9.5±0.5 GPa evidenced by the disappearance of the Atg stretching *** was intercalated with elemental manganese to^1 at.%.Intercalation lowers the pressure of the proposed phase transition to 7.5±1 *** modes show both phonon stiffening and phonon softening,suggesting negative linear *** results provide fundamental insight into the high-pressure optical phonon behavior of silicon telluride and illuminate how a specific electron-donating intercalant can chemically alter pressure-dependent optical phonon behavior.

关键词： silicon telluride Si2Te3 high pressure diamond anvil cell two-dimensional(2D)layered material

Observations of defect propagation in [100]-oriented opal-type photonic crystals

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Chinese Physics B 2008年第4期17卷 1298-1304页

作者：金崇君 Richard M.De La Rue Nigel P.johnson Department of Electronics & Electrical Engineering University of Glasgow School of Physics and Engineering Laboratory of Optoelectronic Materials and TechnologiesSun Yat-Sen University

Charged colloidal suspensions have been used as experimental models for the study of crystal nucleation. Here we propose that the technique of template-assisted colloidal self-assembly can be used to visualize the effects of defect propagation in atomic crystal films produced using epitaxial growth. Templates with periodic line defects were used to grow [100]-oriented three-dimensional photonic crystals by means of the template-assisted colloidal self-assembly method, aided by capillary and gravitational forces. The defect propagation in the [100]-oriented photonic crystal was observed using scanning electron microscopy, both at the surface of the crystal and on cleaved facets. This method is useful in the understanding of defect propagation in the growth of colloidal films on templates - and the same approach may also prove useful for the understanding of atomic crystal growth on substrates with defects. Additionally, the deliberate incorporation of line defects may prove valuable as a way of introducing waveguide channels into three-dimensional photonic crystals.

关键词： photonic crystal colloidal crystal self-assembly

Comparing children＇s Homo sapiens and chimpanzees＇ Pan troglodytes quantity judgments of sequentially presented sets of items

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Current Zoology 2011年第4期57卷 419-420,421-428页

作者： Michael J. BERAN Julie S. johnson-PYNN Christopher READY Language Research Center Georgia State University Atlanta GA 30302 USA Department of Psychology Berry College Mount Berry GA 30149 USA

We presented a quantity judgment task that involved comparing two sequentially presented sets of items to preschoolers and chimpanzees using nearly identical procedures that excluded verbal instructions to children. Trial difficulty in this task reflected the ratio difference between sets of discrete items where larger ratios （e.g., 0.80 as from comparing 4 to 5） were more difficult than smaller ones （e.g., 0.50 as from comparing 4 to 8）. Children also completed verbal-based tasks probing the relationskip between counting proficiency and performance on the quantity judgment task of sequentially presented identical sized items. Both species＇ performance was best when ratios between comparison sets were small regardless of set size in all types of tasks. Generally, chimpanzees and older children performed better than younger children except at larger ratios. Children＇s counting proficiency was not related to success in choosing the larger of two quantities of identical-sized items. These results indicate that chimpanzees and children share an approximate number sense that is reflected through analog magnitude estimation when comparing quantities [Current Zoology 57 （4）： 419-428, 2011].

关键词： Numerical cognition Quantity judgments Children Chimpanzees Pan troglodytes

FOCUS： PUNITIVE DAMAGES IN CHINA PUNITIVE DAMAGES, CHINESE TORT LAW, AND THE AMERICAN EXPERIENCE

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Frontiers of Law in China-Selected Publications from Chinese Universities 2014年第3期9卷 321-358页

作者： Vincent R. johnson Yale University New Haven Connecticut USA Professor of Law and Director of the Institute on Chinese Law & Business at StMary’s University San Antonio Texas USA.

In a country such as China, with abundant consumer products and the inevitability of product defects, claims for punitive damages are sure to arise under Article 47 of the new Chinese Tort Law. Article 47 provides that ＂（w）hereany producer or seller knowingly produces or sells defective products, causing death or serious damage to the health of others, the injured party may request appropriate punitive damages.＂ As Chinese jurists and scholars interpret Article 47, they may wish to consider whether lessons can be drawn from the American experience. During the past two decades, few areas of American law have changed more radically than the law on punitive damages. While there were once few restraints on the ability of a judge or jury to impose punitive damages in a case involving egregious conduct, today there are a host of limitations embodied in American state and federal law. In many American states, statutes or judicial decisions restrict the ability of a court to award punitive damages by narrowly defining the types of conduct that will justify a punitive award, raising the standard of proof capping the amount of punitive damages, requiring a portion of a punitive award to be forfeited to the state, or limiting vicarious liability for punitive damages. In addition, under federal constitutional law, the principle of due process limits the imposition of punitive damages by scrutinizing the ratio between compensatory and punitive damages and prohibiting an award to be based on harm to persons other than the plaintiff. An examination of these developments from a comparative law perspective may prove useful to the implementation of Article 47.

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Common-path interferometric label-free protein sensing with resonant dielectric nanostructures

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Light(Science & Applications) 2020年第1期9卷 1086-1094页

作者： Isabel Barth Donato Conteduca Christopher Reardon Steven johnson Thomas F.Krauss Department of Physics University of YorkYO105DD YorkUK Department of Electronic Engineering University of YorkYO105DD YorkUK

Research toward photonic biosensors for point-of-care applications and personalized medicine is driven by the need for high-sensitivity,low-cost,and reliable *** the most sensitive modalities,interferometry offers particularly high performance,but typically lacks the required operational simplicity and ***,we introduce a common-path interferometric sensor based on guided-mode resonances to combine high performance with inherent *** sensor exploits the simultaneous excitation of two orthogonally polarized modes,and detects the relative phase change caused by biomolecular binding on the sensor *** wide dynamic range of the sensor,which is essential for fabrication and angle tolerance,as well as versatility,is controlled by integrating multiple,tuned structures in the field of *** approach circumvents the trade-off between sensitivity and dynamic range,typical of other phase-sensitive modalities,without increasing *** sensor enables the challenging label-free detection of procalcitonin,a small protein(13 kDa)and biomarker for infection,at the clinically relevant concentration of 1 pg mL^(−1),with a signal-to-noise ratio of *** result indicates the utility for an exemplary application in antibiotic guidance,and opens possibilities for detecting further clinically or environmentally relevant small molecules with an intrinsically simple and robust sensing modality.

关键词： dielectric integrating simplicity

Research on the Influence of Transformational Leadership on Employees' Innovation Behavior

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Research on the Influence of Transformational Leadership on ...

作者： Deleena johnson 上海交通大学

学位级别：硕士

Economic globalization has entered the era of *** the face of a more complex and ever-changing market environment,companies must lead their employees to adapt to the *** the context of the knowledge economy,the most important assets of enterprises are human resources and intellectual *** ability of enterprise innovation has replaced resources as the decisive factor of the core competitiveness of *** the enterprise,the leaders are the decision-makers and implementers of innovation activities,and the employees are the main body and performers of innovation *** behavior of employees is bound to be influenced by *** influence of *** one of the most important leadership styles that influence employee behavior,this research focuses on the impact of transformational leadership on employee innovation behavior and uses employee organizational identity as a mediator to explore whether it can transform leadership and employee *** behavioral relationship plays a mediating role,and at the same time introduces the organizational innovation atmosphere to explore whether it can play a regulatory role in the relationship between organizational identity and employee innovation ***,carry out literature review and theoretical review,and propose theoretical conceptual models and research ***,analyze the data,empirically analyze the relevant variables,and verify the ***,the data analysis results are discussed,the conclusions are drawn,and the modern enterprise managers are provided with suggestions worthy of reference,and the limitations of this study and the future development direction are pointed *** empirical analysis results of this study show that:(1)The main effect of transformational leadership on employee innovation behavior is significant,employees' innovation behavior needs to be stimulated by external force,transformational leadership can effectively stimulate emplo

关键词： Transformational leadership Organizational innovation atmosphere Organizational identity Employee innovation behavior

Simulation of mode conversion at the magnetopause

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Chinese Science Bulletin 2012年第12期57卷 1375-1383页

作者： LIN Yu johnson Jay WANG XueYi LU QuanMing Physics Department Auburn University Auburn 36849 USA Department of Geophysics and Planetary Science University of Science and Technology of China Hefei 230026 China princeton Plasma Physics Laboratory Princeton University Princeton 08543 USA

Two-dimensional(2-D)and three-dimensional(3-D)hybrid simulations are carried out for mode conversion from fast mode compressional wave to kinetic Alfvn waves(KAWs)at the inhomogeneous magnetopause *** cases in which the incident fast wave propagates in the xz plane,with the magnetopause normal along x and the background magnetic field pointing along z,the 2-D (xz)simulation shows that KAWs with large wave number kxρi～1 are generated near the Alfve′n resonance surface,whereρi is the ion Larmor *** nonlinear wave properties are manifest in the mode conversion *** of the driver frequency are *** a result of nonlinear wave interaction,the mode conversion region and its spectral width are *** the 3-D simulation,after this first stage of the mode conversion to KAWs with large kx,a subsequent generation of KAW modes of finite ky is observed in the later stage,through a nonlinear parametric decay *** the nonlinear cascade to ky can lead to massive transport at the magnetopause,the simulation results provide an effective transport mechanism at the plasma boundaries in space as well as laboratory plasmas.

关键词：模拟模式磁层顶等离子体边界模式转换非线性波非线性参数波动力学混合模拟

Ignition and combustion of pyrotechnics at low pressures and at temperature extremes

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Defence Technology（防务技术） 2017年第3期13卷 119-126页

作者： Clive Woodley R.Claridge N.johnson A.Jones QinetiQ MOD Fort Halstead

Rapid and effective ignition of pyrotechnic countermeasure decoy flares is vitally important to the safety of expensive military platforms such as aircraft. Qineti Q is conducting experimental and theoretical research into pyrotechnic countermeasure decoy flares. A key part of this work is the development and application of improved models to increase the understanding of the ignition processes occurring for these flares. These models have been implemented in a two-dimensional computational model and details are described in this paper. Previous work has conducted experiments and validated the computational model at ambient temperature and pressure. More recently the computational model has been validated at pressures down to that equivalent to 40,000 feet but at ambient temperature(~290 K).This paper describes further experimental work in which the ignition delays of the priming material in inert countermeasure decoy flares were determined for pressures down to 40,000 feet and at temperature extremes of -40℃ and 100℃ Also included in this paper is a comparison of the measured and predicted ignition delays at low pressures and temperature extremes. The agreement between the predicted and measured ignition delays is acceptable.

关键词：压力下降极端温度点火过程烟火二维计算模型燃烧实验工作点火延迟

Pushover and Time History Analysis of Steel Frames Using SAP2000

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Pushover and Time History Analysis of Steel Frames Using SAP...

作者： ABAYI johnson 湖南大学

学位级别：硕士

本研究的主要目的是测试在自定义荷载下的五层钢框架的模态静力弹塑性分析和时程分析,采用一种强大的结构分析软件工具--SAP2000。本研究对两个五层钢框架进行比较分析,以观察其响应差异,其中一个是完整的5层框架,另一个是相同的仅移除... 详细信息

本研究的主要目的是测试在自定义荷载下的五层钢框架的模态静力弹塑性分析和时程分析,采用一种强大的结构分析软件工具--SAP2000。本研究对两个五层钢框架进行比较分析,以观察其响应差异,其中一个是完整的5层框架,另一个是相同的仅移除其中一个梁和一个柱的五层框架。这项研究由于两个主要原因变得必要:第一个原因是创新结构设计需求的不断增长,要求取消一些梁和柱以达到更优的形状和空间;第二个原因是实现经济效益,以避免浪费。在8度罕遇地震下,拆除了一根梁构件后的钢框架结构Pushover分析得到的基底剪力最大值比完整的钢框架结构基底剪力最大值要小8%左右,而在顶点位移最大值方面,是否拆除梁构件对该结果相对误差为0.1%,几乎没影响。进一步的比较最终的性能点,拆除梁构件后钢框架结构比完整结构结果大1%左右,影响不大。拆除梁构件后,钢框架结构第一振型在第1～3层及第5层振型位移方面没有变化,而其第4层振型位移增大了7.1%。梁的拆除与否对该钢框架结构第1、2、3层的层间位移角没有影响较小,而对第4、5层的层间位移角影响明显。时程分析结果:拆除梁与否对第4层和第5层的层间位移的影响较第1～3层层间位移要大。拆除梁构件后得到层间位移角均值除第2层比拆除前计算结果要小之外,其余楼层的层间位移角结果均要大于拆除前计算结果。

关键词： Pushover分析时间程分析钢框架性能点能力谱