红外烘烤对魔芋葡甘露聚糖表观黏度以及微观结构的影响

加热处理能降低魔芋葡甘露聚糖（konjac glucomannan,KGM）的黏度,并显著影响其理化性质。本实验以纯化魔芋微粉为原料,通过KGM水溶胶黏度、流变性质测定和KGM分子质量测定,KGM紫外吸收光谱、傅里叶变换红外光谱分析,以及KGM扫描电子显微镜观察,研究红外烘烤温度、时间对KGM表观黏度以及微观结构的影响。结果表明,随着烘烤温度升高和时间延长,KGM水溶胶的表观黏度均表现出典型的剪切稀化现象,储能模量（G’）和损耗模量（G”）明显下降;在剪切速率为10 s－1时,与未烘烤KGM水溶胶相比,150 ℃烘烤30 min的KGM水溶胶黏度下降了97.18%,180 ℃烘烤10 min的KGM水溶胶黏度下降了99.51%。扫描电子显微镜分析结果显示,烘烤热处理温度和时间均对KGM的微观结构造成了一定程度的破坏,但傅里叶变换红外光谱分析结果表明烘烤热处理对KGM分子重复单元结构与特征功能基团并未造成破坏,其特征基团结构得以保留,仅部分糖苷键及氢键断裂;分子质量测定结果表明,150 ℃烘烤30 min与180 ℃烘烤10 min均会明显降低KGM的分子质量。综上,红外烘烤热处理可作为热降解KGM的有效手段,其理化性质的改变可扩展其在食品、医药等领域的应用。     

不同酵母对脐橙果酒品质的影响

为了筛选适宜脐橙果酒加工的优良酵母,本文以崀丰脐橙为原料,选取BV818、DV10、RV002、RV171、K1和L2323共6种酵母进行发酵,通过超高效液相色谱和顶空固相微萃取-气相色谱质谱联用仪分析理化指标和挥发性香气物质,采用气味活度值及主成分分析法进行分析及综合评价。结果表明：RV002的发酵速率最快,K1、L2323、DV10和RV002发酵后脐橙酒总黄酮含量高于CK,RV171、RV002、DV10与K1中柠檬苦素类物质\     

基于改进共轭梯度的大规模多输入多输出预编码

针对大规模多输入多输出（Massive MIMO）系统下行链路预编码实现复杂、线性预编码矩阵求逆困难等问题，提出一种基于对称逐步超松弛预处理共轭梯度法（SSOR-PCG）的低复杂度预编码算法。该算法在共轭梯度（PCG）算法的基础上，采用对称逐步超松弛分裂（SSOR）算法对矩阵进行预处理以降低矩阵的条件数，达到提高预编码算法收敛速度、降低复杂度的目的。仿真结果表明：与PCG算法相比，所提出的SSOR-PCG预编码算法运行时间缩短约88.93%，在信噪比为26 dB时已收敛；与迫零预编码算法相比，所提算法迭代2次即可获得与迫零预编码算法相近的系统容量性能，复杂度降低约一个数量级，误码率降低约49.94%。     

青岛中联创意广场

中联创意广场位于青岛市中心区主干道宁夏路与南京路交叉口,宁夏路上还有东西高架路,用地四周皆为市政道路,南京路和宁夏路上均有公交车站,地铁一期工程在此设南京路站将于2014年启用通车。     

不同尺寸双点蚀缺陷管道剩余强度分析

现有的双腐蚀缺陷管道剩余强度评价规范大多以轴向均匀腐蚀为研究对象,评价双点蚀缺陷管道时结果偏保守,导致管材浪费严重。利用非线性有限元分析方法,对含有交互影响双点蚀缺陷管道的剩余强度进行分析,验证了分析方法的可靠性。在此基础上,研究轴向间距对带有不同尺寸双点蚀缺陷管道失效压力的影响。分析表明:不同尺寸双点蚀缺陷,可将ls作为交互影响的临界间距,超过此间距,双点蚀缺陷相互作用可以忽略;由于腐蚀坑形状系数n的不同,相比直径差距,双点蚀缺陷深度差距对缺陷管道失效压力的影响明显增加;在双点蚀缺陷交互作用区间0ldls,双点蚀缺陷管道失效压力随轴向间距呈对数函数变化。     

基于解释水平研究音乐节奏对利他行为的影响

音乐存在于生活的方方面面,通过影响个体的认知进而影响行为决策。文章引入解释水平理论,探究音乐节奏对个体利他行为的影响。通过系统的行为学实验,研究发现相对于快节奏的音乐,节奏较慢的音乐能够提升个人解释水平,从而驱使在慈善活动中捐献更多的金钱,即节奏舒缓的音乐更有助于人们展现利他行为。解释水平作为中介变量作用于音乐节奏对利他行为的影响。这表明不同的音乐节奏能够带来异质性的解释水平,从而激发不同的利他行为。     

Oxygen addition for improving the strength and plasticity of TiZr-based amorphous alloy composites

The addition of a small amount of oxygen improves the mechanical properties,especially plasticity,of Ti45.7Zr33Ni3Cu5.8Be12.5 amorphous alloy composites (AACs) at room temperature (298 K).Compared to the plasticity of AACs without added O (5％),the plasticity of the composites with 0.73 at.％ O (nominal composition) was much higher (11％).Even at O content higher than 0.73 at.％,the AACs exhibited good plasticity.The highest plasticity of ～12.3 ％ was observed with 2.87 at.％ O.Two distinct mechanisms are proposed to explain the enhanced plasticity of the AACs.At low O content,although deformation-induced phase transformation was suppressed,a substantial amount of α'martensite was formed.The microstructural features of α'martensite,such as thinner laths and homogeneous distribution,induced the formation of multiple shear bands in the amorphous matrix.At high O content,deformation-induced phase transformation was seriously suppressed.A dispersed nano ω phase was formed during rapid solidification in AACs with O content higher than 1.45 at.％.This resulted in a weakening in the anisotropy of β dendrites and led to their homogenous deformation.Furthermore,multiple shear bands were formed in the amorphous matrix.Apart from plasticity,the strength of the AACs also increased with an increase in the O content.This phenomenon was explained in terms of three mechanisms,viz.the solid-solution-strengthening effect of O,fine-grain strengthening of β dendrites,and secondary phase strengthening by the nano ω phase.     

不相同定时截尾试验中平均寿命的置信限

使用样本空间排序法给出了指数分布情形下不相同定时截尾试验平均寿命置信下限的估计方法。     

中文搜索引擎概念检索初探

搜索引擎传统的关键词匹配检索模式存在很多问题,概念检索是解决这些问题的关键技术之一。该文简要介绍了概念检索的主要内容,针对中文搜索引擎,探索出了一种基于概念语义网络知识库的概念检索模型。在此基础上,针对计算机这一特定领域,创建了一个含有500多个概念节点,包括概念层次关系和近300种概念相关关系的语义网络,初步实现了计算机领域文档的概念检索。实验结果表明,该模型对于提高中文搜索引擎的智能水平是非常有效的。     

Intelligent Sonocatalytic Nanoagents for Energy Conversion-Based Therapies

Sonodynamic therapy (SDT) utilizes ultrasound-irradiating sonosensitizers to convert ultrasonic vibrations into chemical energy and produce reactive oxygen species (ROS) that cause cell apoptosis or necrosis. SDT demonstrates significant potential in the treatment of deep tumors without normal tissue damage. Rapid advances in the efficacy of SDT have enabled the rational design and construction of novel intelligent sonocatalytic nanoagents (SCNs) with various functions for versatile biomedical applications. Herein, the most recent critical advancements in intelligent SCNs for energy conversion-based therapies are discussed. Typical SCNs including organic molecules, organic micro-/nanoparticles, inorganic micro-/nanoparticles, organic/inorganic hybrids, and piezoelectric materials are introduced and summarized in detail. Furthermore, these intelligent SCNs are designed for different energy conversion-based therapies such as SDT, SDT-assisted chemotherapy, SDT-assisted photodynamic therapy, SDT-assisted photothermal therapy, SDT-assisted gas therapy, SDT-assisted sonoporation from the cell membrane to the blood brain barrier, and high-intensity focused ultrasound-based sonothermal therapy. It is believed that this review will provide an overview of the application of intelligent SCNs in sonodynamic therapies to better understand the limitations and challenges of these SCNs and further promote their advancements for a broad range of biomedical applications.