Experimental Study on Bending Performance of Composite Sandwich Panel with New Mixed Core

This paper presents an experimental investigation of bending performance of composite sandwich panels with new mixed core, sandwich panels were tested by four-point bending test. Parametric study was conducted to investigate the influence of different core materials on the failure mode, ultimate bearing capacity, stiffness and ductility of composite sandwich panels. The results of the experimental investigation showed that the mixed core can change the failure mode of sandwich panels. The failure mode of wooden panels is characterized by tensile failure of bottom wood, and the failure mode of composite sandwich panels with wood core is that the surface layer and core are stripped and the webs are damaged by shear, while the failure mode of composite sandwich panels with wood and polyurethane foam mixed core is the shear failure of the web. Composite sandwich panels with GFRP-wood-polyurethane foam core have better bending performance and can effectively reduce the weight of panels

A Computational Framework for Heparan Sulfate Sequencing Using High-resolution Tandem Mass Spectra

Heparan sulfate (HS) is a linear polysaccharide expressed on cell surfaces, in extracellular matrices and cellular granules in metazoan cells. Through non-covalent binding to growth factors, morphogens, chemokines, and other protein families, HS is involved in all multicellular physiological activities. Its biological activities depend on the fine structures of its protein-binding domains, the determination of which remains a daunting task. Methods have advanced to the point that mass spectra with information-rich product ions may be produced on purified HS saccharides. However, the interpretation of these complex product ion patterns has emerged as the bottleneck to the dissemination of these HS sequencing methods. To solve this problem, we designed HS-SEQ, the first comprehensive algorithm for HS de novo sequencing using high-resolution tandem mass spectra. We tested HS-SEQ using negative electron transfer dissociation (NETD) tandem mass spectra generated from a set of pure synthetic saccharide standards with diverse sulfation patterns. The results showed that HS-SEQ rapidly and accurately determined the correct HS structures from large candidate pools

Overview of China’s Antarctic research progress 1984–2016

It is more than 30 years since the first Chinese National Antarctic Research Expedition (CHINARE) landed in Antarctica in 1984, representing China’s initiation in polar research. This review briefly summarizes the Chinese Antarctic scientific research and output accomplished over the past 30 years. The developments and progress in Antarctic research and the enhancement of international scientific cooperation achieved through the implementation of the CHINARE program have been remarkable. Since the 1980s, four permanent Chinese Antarctic research stations have been established successively and 33 CHINAREs have been completed. The research results have been derived from a series of spatiotemporal observations in association with various projects and multidisciplinary studies in the fields of oceanography, glaciology, geology, geophysics, geochemistry, atmospheric science, upper atmospheric physics, Antarctic astronomy, biology and ecology, human medicine, polar environment observation, and polar engineering

Precise Measurements of Branching Fractions for Ds+D_s^+ Meson Decays to Two Pseudoscalar Mesons

We measure the branching fractions for seven $D_{s}^{+}$ two-body decays to pseudo-scalar mesons, by analyzing data collected at $\sqrt{s}=4.178\sim4.226$ GeV with the BESIII detector at the BEPCII collider. The branching fractions are determined to be $\mathcal{B}(D_s^+\to K^+\eta^{\prime})=(2.68\pm0.17\pm0.17\pm0.08)\times10^{-3}$, $\mathcal{B}(D_s^+\to\eta^{\prime}\pi^+)=(37.8\pm0.4\pm2.1\pm1.2)\times10^{-3}$, $\mathcal{B}(D_s^+\to K^+\eta)=(1.62\pm0.10\pm0.03\pm0.05)\times10^{-3}$, $\mathcal{B}(D_s^+\to\eta\pi^+)=(17.41\pm0.18\pm0.27\pm0.54)\times10^{-3}$, $\mathcal{B}(D_s^+\to K^+K_S^0)=(15.02\pm0.10\pm0.27\pm0.47)\times10^{-3}$, $\mathcal{B}(D_s^+\to K_S^0\pi^+)=(1.109\pm0.034\pm0.023\pm0.035)\times10^{-3}$, $\mathcal{B}(D_s^+\to K^+\pi^0)=(0.748\pm0.049\pm0.018\pm0.023)\times10^{-3}$, where the first uncertainties are statistical, the second are systematic, and the third are from external input branching fraction of the normalization mode $D_s^+\to K^+K^-\pi^+$. Precision of our measurements is significantly improved compared with that of the current world average values

Neuroscience of wisdom/wise advising

Wisdom is the intellectual virtue of considering all possible factors related to a problem, especially relevant individuals’ interests and perspectives. Consistently, wisdom advising is advising individuals in distress after considering different factors, especially different individuals’ interests and perspectives. Previous studies generally adopted a third-person perspective wisdom-advising paradigm. However, Martin Buber argues that there is a fundamental difference between the I-He/She relationship and the I-thou relationship, such that the latter is more equal and authentic than the former. We predicted that second-person perspective advising may be easier for the individuals to derive meanings from their own life experience and sympathize with the advised person, and thus enhance general wisdom conveyed through advising. On the other hand, second-person perspective advising may also make advisors more self-centered and more self-defensive, and thus less wise advising on the problem, as suggested by previous studies on perspective effect on wise reasoning (Grossmann, Brienza, & Bobocel, 2017; Grossmann & Kross, 2014). In this research project, an innovative second-person perspective wisdom-advising paradigm is proposed to investigate the potential differences in neural activity between the second-person perspective and third-person perspective wisdom-advising. Moreover, we will investigate the correlation between General Wisdom conveyed through the second-person perspective advising and the advisors’ Personal Wisdom

suicide studies

When advising on a life dilemma of others, individuals do not only analyze the specific life dilemma but also relate the life dilemma to their life experience, deriving meanings from their own life narratives. Therefore, advice-giving is not only a manifestation of general wisdom, i.e., insights into life in general (Staudinger, 2013) but also an embodiment of personal wisdom, i.e., insights into one's personal life (Mickler & Staudinger, 2008). Even when advising a hypothetical protagonist, advisors will feel certain emotions based on hypothetical scenarios. Therefore, this paradigm provides a clean window to look into a person's mental world

Geometry of Chalcogenide Negative Curvature Fibers for CO2 Laser Transmission

We study the impact of geometry on leakage loss in negative curvature fibers made with As 2 Se 3 chalcogenide and As 2 S 3 chalcogenide glasses for carbon dioxide (CO 2 ) laser transmission. The minimum leakage loss decreases when the core diameter increases both for fibers with six and for fibers with eight cladding tubes. The optimum gap corresponding to the minimum loss increases when the core diameter increases for negative curvature fibers with six cladding tubes. For negative curvature fibers with eight cladding tubes, the optimum gap is always less than 20 μ m when the core diameter ranges from 300 μ m to 500 μ m. The influence of material loss on fiber loss is also studied. When material loss exceeds 10 2 dB/m, it dominates the fiber leakage loss for negative curvature fiber at a wavelength of 10.6 μ m

Comparison of loss in silica and chalcogenide negative curvature fibers as the wavelength varies

We computationally study fiber loss in negative curvature fibers made with silica, As2S3 chalcogenide, and As2Se3 chalcogenide glasses with a fixed core-diameter-to-wavelength ratio of 30. We consider both simple and nested geometries as the transmission wavelength varies. At wavelengths shorter than 4.5 µm, silica negative curvature fibers have a loss that is around or below 0.1 dB/m and are preferable to chalcogenide fibers. At wavelengths longer than 4.5 µm, it is preferable to use As2S3 chalcogenide or As2Se3 chalcogenide negative curvature fibers since their loss is one or more orders of magnitude lower than the loss of silica negative curvature fibers. With nested negative curvature fibers, chalcogenide fibers have losses that are lower than those of silica fibers at wavelengths larger than 2 µm. However, it is still preferable to use silica nested negative curvature fibers at wavelengths less than 4.5 µm and with a loss around or lower than 0.1 dB/m due to the fabrication advantages of silica fibers