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Active Patchy Colloids with Shape-Tunable Dynamics
Wang, Zuochen,Wang, Zhisheng,Li, Jiahui,Cheung, Simon Tsz Hang,Tian, Changhao,Kim, Shin-Hyun,Yi, Gi-Ra,Ducrot, Etienne,Wang, Yufeng American Chemical Society 2019 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.141 No.37
<P>Controlling the complex dynamics of active colloids-the autonomous locomotion of colloidal particles and their spontaneous assembly-is challenging yet crucial for creating functional, out-of-equilibrium colloidal systems potentially useful for nano- and micromachines. Herein, by introducing the synthesis of active “patchy” colloids of various low-symmetry shapes, we demonstrate that the dynamics of such systems can be precisely tuned. The low-symmetry patchy colloids are made in bulk via a cluster-encapsulation-dewetting method. They carry essential information encoded in their shapes (particle geometry, number, size, and configurations of surface patches, etc.) that programs their locomotive and assembling behaviors. Under AC electric field, we show that the velocity of particle propulsion and the ability to brake and steer can be modulated by having two asymmetrical patches with various bending angles. The assembly of monopatch particles leads to the formation of dynamic and reconfigurable structures such as spinners and “cooperative swimmers” depending on the particle’s aspect ratios. A particle with two patches of different sizes allows for “directional bonding”, a concept popular in static assemblies but rare in dynamic ones. With the capability to make tunable and complex shapes, we anticipate the discovery of a diverse range of new dynamics and structures when other external stimuli (e.g., magnetic, optical, chemical, etc.) are employed and spark synergy with shapes.</P> [FIG OMISSION]</BR>
California from drought to deluge
Wang, S.-Y. Simon,Yoon, Jin-Ho,Becker, Emily,Gillies, Robert Nature Publishing Group, a division of Macmillan P 2017 Nature climate change Vol.7 No.7
<P>The dramatic switch from extreme drought to severe flooding in California, and the accompanying flip from atmospheric ridge to trough in the northeastern Pacific, exemplifies the pathways to an intensified water cycle under a warming climate.</P>
Wang, S.-Y. Simon,Lin, Yen-Heng,Lee, Ming-Ying,Yoon, Jin-Ho,Meyer, Jonathan D. D.,Rasch, Philip J. American Geophysical Union 2017 Geophysical research letters Vol.44 No.8
<P>Plain Language Summary Rapid Arctic warming events disrupt mid-latitude weather patterns and oftentimes produce extreme deviations from normal weather conditions. The atmospheric origins of these Arctic warming events have been identified as developing in the troposphere and the stratosphere. Using historical observations, we have found that the frequency of tropospheric warming events has increased through the recent decades, while the stratospheric events have not. We have also found that tropospheric events develop twice as fast as stratospheric events and are therefore less predictable. With observations of historically-low Arctic sea ice extent occurring alongside the increase of tropospheric warming events, computer simulations provided evidence that the two phenomena are likely linked. Along with observational evidence for enhanced transport of tropical energy helping fuel these Arctic tropospheric warming events, these results suggest that future mid-latitude weather is likely to undergo an increase to extreme, unseasonal weather patterns that are inherently less predictable.</P>
The Effect of Product-harm Crisis Situations on Firms’ Response Strategies
Xiaoyu Wang,Zhiliang Wang,Simon Shufeng Xiao 한국관세학회 2012 관세학회지 Vol.13 No.2
The purpose of this paper is to examine the effect of product-harm crisis situations on firms’ response strategies. We divide response strategy into two dimensions: crisis spokesman strategy and crisis responsibility-taking strategy. By content analysis of 103 product-harm crises from Chinese market, we find that crisis type and brand’s country-of-origin have significant effect on spokesman strategy and responsibility- taking strategy, while crisis severity does not influence these response strategies.
Noncoherent Detection of Orthogonal Modulation Combined with Alamouti Space-Time Coding
Simon, Marvin K.,Wang, Ji-Bing The Korea Institute of Information and Commucation 2003 Journal of communications and networks Vol.5 No.2
In this paper, we investigate the error probability performance of noncoherently detected orthogonal modulation combined with Alamouti space-time block coding. We find that there are two types of pair-wise error probabilities that characterize the performance. We employ methods that allow a direct evaluation of exact, closed-form expressions for these error probabilities. Theoretical as well as numerical results show that noncoherent orthogonal modulation combined with space-time block coding (STBC) achieves full spatial diversity. We derive an expression for approximate average bit error probability for-ary orthogonal signaling that allows one to show the tradeoff between increased rate and performance degradation.
Challenges and Tribulations in the Commercialization of New Crops: Aromatic and Medicinal Plants
Simon, James E.,Jefthas, Elton,Longenhaven, Petrus,Smith, Marianna,Renaud, Erica,Juliani, Rodolfo,Wang, Mingfu,Zimba, Noah,Acquaye, Dan,Park, Chung-Heon,Raskin, Ilya,Tannous, Pierre The Korean Society of Medicinal Crop Science 2002 韓國藥用作物學會誌 Vol.10 No.4