A multilayer recognition model for twitter user geolocation

Wireless Networks - Geolocation is important for many emerging applications such as disaster management and recommendation system. In this paper, we propose a multilayer recognition model (MRM) to...     

琥珀酰亚胺酯基类偶氮染料的制备及其超临界CO2羊毛清洁化染色

以对氨基苯甲酸和4-氨基-2-氯苯甲酸、苯胺和间甲苯胺为原料,采用重氮偶合反应制备染料前驱体,通过在前驱体上引入琥珀酰亚胺酯获得4例活性分散染料Ⅰ～Ⅳ.对染料的紫外-可见吸收光谱、光热稳定性、超临界二氧化碳(scCO2)中羊毛纤维的染色工艺等进行了测试.结果表明,4例染料均具有良好的光热稳定性,染料Ⅰ、Ⅲ和Ⅳ最大吸收波长集中在360～370 nm,染料Ⅱ的最大吸收波长红移到379～452 nm,染料均具备scCO2染色的条件.染料Ⅰ和Ⅲ的最佳染色条件为2 h、80℃和15 MPa,染料Ⅱ的最佳染色条件为1.5 h、80℃和15 MPa,染料Ⅳ的最佳染色条件为2 h、80℃和24 MPa.染色后的羊毛纤维的耐皂洗和耐光色牢度都可达4～5级,固色率最高可达86％,相比于未活化的前驱体,耐皂洗色牢度能提高2～3级,固色率最高能提升63％.SEM和显微镜成像证明4例染料具有良好的透染性,且能均匀附着于纤维的表面和内部.力学性能测试表明,染色后的羊毛纤维能基本保持原有的力学性能.     

钢筋混凝土钻孔咬合桩的施工实践及方法介绍

某工程基坑围护结构采用钢筋混凝土钻孔咬合桩,桩径Ф100cm,桩中心距80cm,桩长21-31m,咬合厚度20cm。本文介绍该钻孔咬合桩的施工方法与质量安全措施,并简述施工中出现的问题及采取的措施。     

“中国建筑研究室”初创及研究成果探究

本文以"中国建筑研究室"从1953年4月正式成立到1964年研究室被迫撤销,隶属关系数度变更的历史始末为线索,结合档案文献与人物访谈,特别记述了"中国建筑研究室"初创时期的历史史实。及在刘敦桢的领导下"中国建筑研究室"的调研发现和重要学术研究成果。真实再现了"中国建筑研究室"的历史,阐释其对中国建筑历史理论研究的影响和贡献。     

A Novel Yolk–Shell Fe3O4@ Mesoporous Carbon Nanoparticle as an Effective Tumor-Targeting Nanocarrier for Improvement of Chemotherapy and Photothermal Therapy

Owing to their good stability and high photothermal conversion efficiency, the development of carbon-based nanoparticles has been intensively investigated, while the limitation of unsatisfactory cellular internalization impedes their further clinical application. Herein, we report a novel strategy for fabrication of Fe₃O₄ yolk–shell mesoporous carbon nanocarriers (Fe₃O₄@hmC) with monodispersity and uniform size, which presented significantly higher cell membrane adsorption and cellular uptake properties in comparison with common solid silica-supported mesoporous carbon nanoparticles with core–shell structure. Moreover, the MRI performance of this novel Fe-based nanoparticle could facilitate precise tumor diagnosis. More importantly, after DOX loading (Fe₃O₄@hmC-DOX), owing to synergistic effect of chemo–phototherapy, this therapeutic agent exhibited predominant tumor cell ablation capability under 808 nm NIR laser irradiation, both in vitro and in vivo. Our work has laid a solid foundation for therapeutics with hollowed carbon shell for solid tumor diagnosis and therapy in clinical trials.     

基于随机集理论的并发故障诊断信息融合方法

为了诊断并发故障,提出一种基于随机集理论的信息融合方法.首先构造包含并发故障的论域,并在此论域的超幂集上定义扩展型随机集.基于该随机集和广义集值映射给出证据组合规则的随机集模型,用其构造可以同时适用于单发和并发故障诊断的新型组合规则.此外,根据传感器提供的故障信息构造故障样板模式与待检模式的模糊隶属度函数,利用模糊集的随机集表示以及随机集似然测度,获得两种模式匹配的程度作为待融合的诊断证据.最后通过在电机柔性转子平台上的试验,证明了所提方法可有效地减少单一传感器信息诊断的不确定性,显著提高转子系统故障诊断的精度.     

基于机器学习的密集烘烤过程烟叶失水率预测模型对比

为准确预测密集烘烤过程烟叶失水率,以精准调控烘烤工艺参数,基于机器学习建立烟叶失水率预测模型。以翠碧一号中部叶为材料,实时采集烘烤过程中烟叶图像和失水率;利用图像处理技术提取烟叶的10种颜色特征和10种纹理特征,通过变量聚类和皮尔逊相关性分析优选出2种颜色特征(a^*/b^*、R)和2种纹理特征(梯度熵、梯度分布不均匀性);将训练集图像的4种优选特征和烟叶失水率作为输入变量,分别对建立的网格式支持向量机(GS-SVM)、遗传算法优化的BP神经网络(GA-BP)、极限学习机(ELM)3种预测模型进行训练。利用3种预测模型对测试集图像进行烟叶失水率预测并与实际失水率比较。结果表明,3种预测模型均能够较为准确地预测密集烘烤过程烟叶失水率(均方根误差RMSE≤0.014 0,决定系数R2≥0.996 1),对变黄期(0～40 h)和定色期(40～100 h)的预测误差小于干筋期(100～140 h)。该技术可为烟叶烘烤智能调控系统的研发提供支持。     

Memory effect of reversibly thermoswitchable self-assembly-competent recombinant TMV coat protein with multi-binding moieties with potential applications in nanoparticle purification

Biomolecule-mediated assembly of novel nanoconjugates has been subjected to numerous investigations nowadays, which provides a new insight into the material science and engineering. Via the molecular biology technology, the genetically engineered polypeptide for inorganics (GEPI) can be designed as a molecular binder into the bio-scaffold to assemble hybrid functional nanoarchitectures. In the present work, we constructed a multi-functional virus-like particle (VLP) scaffold based on the Tobacco mosaic virus (TMV) (wild-type strain U1) in a facile way. The S123C site-mutated coat protein (CP) of TMV recombinated with a Ti–GEPI and 6-histidine tag (His tag) was successfully cloned, expressed and purified. The as-produced r-CP products retained both binding affinity for inorganic nanoparticles and self-assembly capability. Analysis of r-CP self-assembly during condensation polymerization was conducted. The r-CP-assembled aggregates including disc-like structures and rod-like VLPs were recovered by preparative size-exclusion chromatography (SEC) and then examined by TEM analysis. Notably, r-CP protein displayed a thermo-triggered reversibly switchable transition between bistable states of transparency and opaqueness. Western blot analysis, Immunogold labelling and TEM analysis were employed to test the existence and binding function of the His tag group in r-CP VLPs. Furthermore, dispersion of TiO₂ NPs in r-CP solution and recyclable application in bio-benefication was introduced. Here we demonstrated the possibilities of combining peptide-mediated immobilization with VLP-based biotemplate bearing multi-binding moieties for prospectful functional applications.     

配电网静止同步补偿器的自抗扰控制

针对配电网静止同步补偿器(distribution static synchronous compensator,D-STATCOM)系统非线性、多变量、强耦合特性、D-STATCOM系统模型的不确定性和不确定性干扰对D-STATCOM控制的影响,研究了D-STATCOM的自抗扰控制技术,提出了一种新型的D-STATCOM自抗扰控制策略,当D-STATCOM系统参数发生变化或遇到不确定扰动时,D-STATCOM控制器仍能保持良好的控制性能以及强的自适应性和鲁棒性。给出了控制器设计的详细过程,并在MATLAB/Simulink环境中建立了系统的仿真模型,给出了仿真和实验结果。仿真和实验结果证明了自抗扰控制策略的正确性和有效性。     

Effect of γ‐aminobutyric acid supplementation on the composition of Chinese rice wine

This study investigated the effect of γ‐aminobutyric acid (GABA) supplementation on the composition of Chinese rice wine. GABA was added at 188.5 and 377 mg/L at the beginning of primary fermentation or post‐fermentation. Addition of GABA during primary fermentation had no impact on alcohol and total acid formation or the utilisation of sugar. However, total free amino acids, total essential amino acids and GABA in rice wine supplemented with GABA were significantly lower than the control rice wine without supplementation. Alcohol formation, total acid, sugar content and total essential amino acids were similar compared with the control. However, the GABA post‐supplementation was significantly higher, suggesting that GABA supplementation post‐fermentation process could enhance the GABA content in rice wine. © 2018 The Institute of Brewing & Distilling