Simulation of wave scattering over a floating platform in the ocean with a coupled CFD-IBM model

A numerical study of linear wave scattering over a floating platform has been simulated by an efficient numericalmodel in this letter.The non-hydrostatic model is used to simulate the free surface and the uneven bottom.For thesolid body modelling,the immersed boundary method(IBM)is implemented by introducing a virtual boundaryforce into the momentum equations to emulate the boundary conditions.This implementation enhances theability of the model to simulate interactions between waves and floating structures.A numerical case involvingwave interactions with a floating platform is studied to validate the numerical model.By simulating the wavepropagation,the numerical model captures the variation of the wave scattering very well,which verifies theperformance of the numerical model and the robust strategy of the IBM.

Screening Strategies to Identify Host Factors Associated with the Early and Late Stages of HIV-1 Life Cycle

Dear Editor, The HIV-1 infection in humans has now become a pandemic and in the absence of treatment it often leads to acquired immunodeficiency syndrome (AIDS). Although significant progress has been made to reduce the HIV-1 viral load in the blood of infected patients, challenges still exist in areas such as viral latency and viral resistance (Hosseinipour M C, 2013; Katlama C, 2013). To flush

Identification of Avian-Derived Ingredients in Livestock and Poultry Meat by PCR Technology

In order to establish a quick and specific method which could identify the avian-derived ingredients,this study used 16 S rRNA gene sequence as target site,and designed the specific primers of chicken,pigeon meat and quail meat. The DNA of common livestock and poultry meat( including mutton,beef,pork,rabbit meat,pigeon meat,quail meat,chicken,duck and goose) was used as template. Though PCR amplification and specific detection,a quick determination method was established to identify the avian-derived ingredients. The results showed that the selected primers could identify the ingredients of animal origin effectively and quickly. The method was convenient and concise,and could detect the chicken-derived,pigeon-derived,quail-derived ingredients in livestock and poultry food quickly and accurately.

非平稳过程异常监测方法:综述与展望

实际工业过程受多种因素(如原材料变化、负载波动、设备老化等)的影响,往往表现出非平稳特性,即过程监测数据统计特性随时间发生变化,因此非平稳过程异常监测备受关注并已成为监测领域的焦点之一.本文从监测方法的角度对非平稳过程异常监测相关研究成果进行了系统性的回顾:首先对非平稳过程的概念和技术难点进行了概述;其次,将非平稳过程监测方法根据原理的差异划分为五大类,并总结了各类方法的优点与不足;最后,结合当前技术发展的现状,对非平稳过程研究中的挑战进行了深入分析与展望。

正畸-修复联合咬合重建治疗牙列过度磨损1例

目的:本文报道1例正畸-修复联合咬合重建治疗牙列过度磨损的病例。诊治经过:男性患者牙列过度磨损,咬合关系异常,对患者进行正畸-修复联合治疗。通过正畸排齐牙列,协调牙弓,使用数字化临时修复体稳定颌位,恢复咬合功能,利用数字化技术准确转移颌位,行正式修复。结果:患者咬合功能恢复,颌位关系稳定,面容及牙体外形和美观均有改善。结论:以咀嚼功能为导向,建立稳定颌位,结合数字化技术实现颌位关系精确转移,正畸-修复联合咬合重建使牙列过度磨损的患者最终恢复了口颌系统的功能,改善了患者的美观。

数据驱动的多工况过程异常监测方法:综述与展望

由于原材料、设定点、外界环境等因素变化,工业过程通常具有多个运行工况.多工况过程异常监测技术是保证工业系统安全运行的有效方式,也是过程监测技术的研究热点与难点.首先,对多工况过程异常监测方法进行概述,并将多工况过程的常见处理方式归纳为整体建模、自适应建模、混合建模和多模型建模方法;其次,分别回顾了多工况平稳过程和多工况非平稳过程的研究现状,并分析了各类方法的优缺点;最后,结合实际工业系统特点,指出该领域亟须解决的问题和未来发展方向.

Generation of time-varying orbital angular momentum beams with space-time-coding digital metasurface

The recently proposed extreme-ultraviolet beams with time-varying orbital angular momentum(OAM)realized by high-harmonic generation provide extraordinary tools for quantum excitation control and particle manipulation.However,such an approach is not easily scalable to other frequency regimes.We design a space-time-coding digital metasurface operating in the microwave regime to experimentally generate time-varying OAM beams.Due to the flexible programmability of the metasurface,a higher-order twist in the envelope wavefront structure of time-varying OAM beams can be further designed as an additional degree of freedom.The time-varying OAM field patterns are dynamically mapped by developing a two-probe measurement technique.Our approach in combining the programmability of space-time-coding digital metasurfaces and the two-probe measurement technique provides a versatile platform for generating and observing time-varying OAM and other spatiotemporal excitations in general.The proposed time-varying OAM beams have application potentials in particle manipulation,time-division multiplexing,and information encryption.

Efect of chromium oxide as active site over TiO_2-PILC for selective catalytic oxidation of NO

This study introduced TiO2-pillared clays （TiO2-PILC） as a support for the catalytic oxidation of NO and analyzed the performance of chromium oxides as the active site of the oxidation process. Cr-based catalysts were prepared by a wet impregnation method. It was found that the 10 wt.% chromium doping on the support achieved the best catalytic activity. At 350℃, the NO conversion was 61% under conditions of GHSV = 23600 hr^-l. The BET data showed that the support particles had a mesoporous structure. Hz-TPR showed that Cr（10）TiP （10 wt.% Cr doping on TiO2-PILC） clearly exhibited a smooth single peak. EPR and XPS were used to elucidate the oxidation process. During the NO ＋ O2 adsorption, the intensity of evolution of superoxide ions （O2^-） increased. The content of Cr^3＋ on the surface of the used catalyst was 40.37%, but when the used catalyst continued adsorbing NO, the Cr^3＋ increased to 50.28%. Additionally, Oα/Oβ increased markedly through the oxidation process. The NO conversion decreased when SO2 was added into the system, but when the SO2 was removed, the catalytic activity recovered almost up to the initial level. FT-IR spectra did not show a distinct characteristic peak of SO4^2-.

Chemerin promotes proliferation and migration of ovarian cancer cells by upregulating expression of PD-L1

Ovarian cancer is the third-most-common malignant reproductive tumor in women.According to the American Cancer Society,it has the highest mortality rate of gynecological tumors.The five-year survival rate was only 29%during the period from 1975 to 2008(Reid et al.,2017).

Thinking of peace when rich:The effect of industry growth on corporate risk-taking

We investigate the unique role and mechanisms of industry growth in firms’risk-taking policies.We find that industry growth is negatively associated with corporate risk-taking,consistent with the prospect theory that a high-growth industry gives firms a superior external environment,which may cause them to refrain from corporate risk-taking as in the saying“thinking of peace when rich.”This correlation is stronger for product market leaders,industries encouraged by industry policies and industries that receive more government support.Firms reduce risk-taking through various corporate policies,including long-term,high-value investments,operational efficiency and cash holdings in response to high industry growth.Overall,our results are consistent with industry growth negatively affecting corporate risk-taking.

Enhanced anaerobic fermentation with azo dye as electron acceptor: Simultaneous acceleration of organics decomposition and azo decolorization

Accumulation of hydrogen during anaerobic processes usually results in low decomposition of volatile organic acids（VFAs）. On the other hand, hydrogen is a good electron donor for dye reduction, which would help the acetogenic conversion in keeping low hydrogen concentration. The main objective of the study was to accelerate VFA composition through using azo dye as electron acceptor. The results indicated that the azo dye serving as an electron acceptor could avoid H2 accumulation and accelerate anaerobic digestion of VFAs. After adding the azo dye, propionate decreased from 2400.0 to 689.5 mg/L and acetate production increased from 180.0 to 519.5 mg/L. It meant that the conversion of propionate into acetate was enhanced. Fluorescence in situ hybridization analysis showed that the abundance of propionate-utilizing acetogens with the presence of azo dye was greater than that in a reference without azo dye. The experiments via using glucose as the substrate further demonstrated that the VFA decomposition and the chemical oxygen demand（COD） removal increased by 319.7 mg/L and 23.3% respectively after adding the azo dye. Therefore, adding moderate azo dye might be a way to recover anaerobic system from deterioration due to the accumulation of H2 or VFAs.