Edge mode based graphene nanomechanical resonators for high-sensitivity mass sensor

We perform both molecular dynamics simulations and theoretical analysis to study the sensitivity of the graphene nanomechanical resonator based mass sensors, which are actuated following the global extended mode or the localized edge mode. We find that the mass detection sensitivity corresponding to the edge mode is about three times higher than that corresponding to the extended mode. Our analytic derivations reveal that the enhancement of the sensitivity originates in the reduction of the effective mass for the edge mode due to its localizing feature

Analysis and design of three-stage concatenated color-shift keying

Visible Light Communication (VLC) relies on abundant unlicensed bandwidth resources. As an attractive high-data-rate modulation scheme designed for VLC, Color Shift Keying (CSK) assisted modulation is analysed. We commence our study from an uncoded M-CSK scheme relying on the joint Maximum Likelihood (ML) Hard-Detection (HD) of three colors, when communicating over an AWGN channel, where both empirical and analytical results are provided. We invoke EXtrinsic Information Transfer (EXIT) charts for designing a Maximum A-posteriori Probability (MAP) based Soft-Detection (SD) aided iterative receiver jointly detecting the three colors. Based on the EXIT characteristics of M-CSK, we design different signal labeling strategies for diverse color constellations and detection schemes, which are capable of achieving a substantially improved Bit Error Ratio (BER) performance. Thus, given a fixed transmission power, a CSK system using our proposed signal labeling is capable of increasing the reliable data transmission distance by about 30%

Views on Carnegie’s Philosophy on Philanthropy

In the late 1920s, great American industrial giant, Andrew Carnegie found, Modern American charitable trusts. In Carnegie’s “The Gospel of Wealth,”-its’ basic principle lays the ideological foundation for modern American foundations. His thoughts on wealth are bold. It challenges, creativity, which inspires scientific administration and application of wealth surplus to benefit society. Society, thus, gains long-term stability and; beneficiaries reap long-lasting social interests. From the late 1930s to the beginning of the 20th century, Americans regarded philanthropy as one of the most effective ways for public figures to build societal image. Some readings and books related to Carnegie’s philosophy on Philanthropy. Challenge whether traditional understandings on wealthy individuals’ philanthropy were either passively motivated or ill-intentioned. Using Andrew Carnegie’s philosophy on philanthropy as a case study, this article studies the most important economic and political figure Andrew Carnegie in the period of American industrialization. This article analyzes his thoughts and practices, its influences on the country’s philanthropic culture, as well as continuing developments on socialist democratic society