纯净美妆产品的设计理念

以消费者、行业专家、各品牌商以及全球各个美妆相关行业对纯净美妆的认识为依据,从配方设计、关键的原料筛选、生产过程、包材选择以及测试评估等方面,对如何实现纯净美妆产品进行了较为详细的阐述,无疑为纯净美妆的标准建立和定义提供很好的参考.     

Priority-MECE: A Mobile Edge Cloud Ecosystem Based on Priority Tasks Offloading

Mobile Networks and Applications - With the rapid development of Internet of things, the traditional city model is no longer applicable. Therefore, the emerging concept of smart city meets the...     

Multi-UAV Collaborative Wireless Communication Networks for Single Cell Edge Users

Mobile Networks and Applications - Due to fast deployment, strong survivability and flexible scheduling, multiple unmanned aerial vehicles (UAV) can synergistically optimize the trajectory and...     

Machine learning of phases and mechanical properties in complex concentrated alloys

The mechanical properties of complex concentrated alloys (CCAs) depend on their formed phases and corresponding microstructures.The data-driven prediction of the phase formation and associated mechanical properties is essential to discovering novel CCAs.The present work collects 557 samples of various chemical compositions,comprising 61 amorphous,167 single-phase crystalline,and 329 multi-phases crystalline CCAs.Three classification models are developed with high accuracies to category and understand the formed phases of CCAs.Also,two regression models are constructed to predict the hard-ness and ultimate tensile strength of CCAs,and the correlation coefficient of the random forest regression model is greater than 0.9 for both of two targeted properties.Furthermore,the Shapley additive expla-nation (SHAP) values are calculated,and accordingly four most important features are identified.A significant finding in the SHAP values is that there exists a critical value in each of the top four fea-tures,which provides an easy and fast assessment in the design of improved mechanical properties of CCAs.The present work demonstrates the great potential of machine learning in the design of advanced CCAs.     

Resolving Deep Sub-Wavelength Scattering of Nanoscale Sidewalls Using Parametric Microscopy

The quantitative optical measurement of deep sub-wavelength features with sub-nanometer sensitivity addresses the measurement challenge in the semiconductor fabrication process. Optical scatterings from the sidewalls of patterned devices reveal abundant structural and material information. We demonstrated a parametric indirect microscopic imaging (PIMI) technique that enables recovery of the profile of wavelength-scale objects with deep sub-wavelength resolution, based on measuring and filtering the variations of far-field scattering intensities when the illumination was modulated. The finite-difference time-domain (FDTD) numerical simulation was performed, and the experimental results were compared with atomic force microscopic (AFM) images to verify the resolution improvement achieved with PIMI. This work may provide a new approach to exploring the detailed structure and material properties of sidewalls and edges in semiconductor-patterned devices with enhanced contrast and resolution, compared with using the conventional optical microscopy, while retaining its advantage of a wide field of view and relatively low cost.     

Mechanical properties and wear behavior of Tin+1(Al,A)Cn (A = Ga,In, Sn,n = 1, 2) via quasi-high-entropy of single atomic thick A layer

The strengthening method of multi-element M-site solid solution is a common approach to improve mechanical properties of MAX phase ceramic. However, the research on capability of multi-element A-site solid solution to improve mechanical properties has rarely been reported. Thereupon, quasi-high-entropy MAX phase ceramic bulks of Ti₂(Al_1?xA_x)C and Ti₃(Al_1?xA_x)C₂ (A = Ga, In, Sn, x = 0.2, 0.3, 0.4) were successfully synthesized by in situ vacuum hot pressing via multi-elements solid solution. The multi-elements solid solution in single-atom thick A layer was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy as well as by energy dispersive X-ray spectroscopy mappings. Effects of doped multi-elements contents on the phase, microstructure, mechanical properties, and high temperature tribological behaviors were studied. Results demonstrated that the Vickers hardness, anisotropic flexural strength, fracture toughness, and tribological properties of Ti–Al–C based MAX ceramics could be remarkably improved by constitution of quasi-high-entropy MAX phase in A layers. Moreover, the strengthening and wear mechanisms were also discussed in detail. This method of multi-element solid solution at A-site provides new way to enhance mechanical properties of other MAX phase ceramics.     

贯筋藤凝乳剂对小鼠急性毒性与遗传毒性研究

目的探究贯筋藤作为凝乳剂的安全性。方法以贯筋藤凝乳剂为受试物,采用限量法评价贯筋藤凝乳剂对小鼠的急性毒性,观察小鼠体重及解剖后心脏、脾脏、肝脏、肾脏是否发生病变;采用Ames实验评价其遗传毒性,设20、100、500、2500、12500μg/皿剂量组进行遗传毒性实验。结果急性毒性实验未出现小鼠死亡情况。研究发现小鼠的精神亢奋,有较强攻击欲望,根据小鼠的生理状况对小鼠进行脑组织中MAO-A和5-HT含量检测发现空白组和实验组差异极显著(P0.01)。通过Ames试验检测贯筋藤凝乳剂的遗传毒性,根据结果发现在12500μg/皿的情况下出现抑制微生物生长的情况,而在2500μg/皿的剂量下统计每组菌落数差异不著性(P0.05)。结论贯筋藤凝乳剂的LD50剂量大于10000 mg/kg,并根据Ames试验确定贯筋藤凝乳剂在最高2500μg/皿不具有致突变作用。     

位阻胺选择性配方溶剂尾气处理装置工业应用

为了解决常规甲基二乙醇胺(MDEA)脱硫溶剂在低压下脱硫效果不理想,导致排放尾气中SO_2浓度升高的问题,利用位阻胺与H_2S反应具有良好活性、同时能较好抑制位阻胺与CO_2反应的特点,研究开发出了位阻胺选择性脱硫配方溶剂,并在处理量为1×10~4m~3/d的装置上进行中间放大试验的基础上,在中国石油西南油气田公司川中油气矿龙岗天然气净化厂硫磺回收加氢尾气脱硫装置上进行了工业应用。在工业应用期间,考察了溶剂在不同吸收塔板数、不同贫液入塔温度、不同溶液循环量等条件下的吸收性能,还考察了脱硫溶液的再生性能,确定了较适宜的工艺操作参数。应用1年后的考核结果表明:(1)该位阻胺选择性脱硫配方溶剂在进尾气脱硫吸收塔气体中H_2S含量为0.77%～3.96%、CO_2含量为23.91%～32.79%的气质条件下,可使净化尾气中H_2S含量低于30 mg/m~3;(2)与装置原用的常规MDEA相比,净化尾气中H_2S含量降低58.45%;(3)该位阻胺选择性脱硫配方溶剂的再生性能良好,再生后贫液中H_2S和CO_2含量均小于0.12 g/L。     

Discrete‐time sector based hands‐off control for nonlinear system

This article presents a hands‐off control design for discrete‐time nonlinear system with a special type of nonlinear sector termed as “discrete‐time sector.” The design method to define the boundary of a discrete‐time sector is done with control‐Lyapunov function. The generalization of nonlinear system is viewed in the perspective of a comparison function. By means of a proposed sector, a switching control is designed such that no control action is experienced inside the sector thus, saving unnecessary control efforts. However, to study the robustness for discrete‐time system, a hands‐off control is modified to ensure the monotonic decrease in the energy of the system. Finally, the proposed approach is verified with the simulation results.