Hydrothermally Grown ZnO Micro/Nanotube Arrays and Their Properties

We reported the optical and wettability properties of aligned zinc oxide micro/nanotube arrays, which were synthesized on zinc foil via a simple hydrothermal method. As-synthesized ZnO micro/nanotubes have uniform growth directions along the [0001] orientations with diameters in the range of 100–700 nm. These micro/nanotubes showed a strong emission peak at 387 nm and two weak emission peaks at 422 and 485 nm, respectively, and have the hydrophobic properties with a contact angle of 121°. Single ZnO micro/nanotube-based field-effect transistor was also fabricated, which shows typical n-type semiconducting behavior.     

Combined sparsifying transforms for compressed sensing MRI

In traditional compressed sensing MRI methods, single sparsifying transform limits the reconstruction quality because it cannot sparsely represent all types of image features. Based on the principle of basis pursuit, a method that combines sparsifying transforms to improve the sparsity of images is proposed. Simulation results demonstrate that the proposed method can well recover different types of image features and can be easily associated with total variation.     

基于感知条件网络的可控语音增强模型

为了给不同听者在不同场景下提供更好的语音增强主观听觉感受,提出了一种基于感知条件网络的可控语音增强模型。首先设计分位数损失函数来对语音的高估和低估进行权衡,并以此来指导网络的训练,通过调节网络输出中的语音损失和噪声残留水平,来控制模型的输出特性。然后为了让单个网络具有可变的输出特性,引入条件网络,利用分位数损失函数中与听者感知相关的分位值产生条件信息来对含噪语音特征进行调制,建立了可控的语音增强模型。实验结果表明,设计的分位数损失函数能够有效调节增强语音中的语音损失和噪声残留水平;基于感知条件网络建立的可控语音增强模型,能够提供可由听者主动控制的增强语音输出特性,使听者获得更好的语音增强体验。     

半球谐振子质量不平衡对振动特性的影响研究

质量不平衡是半球谐振子制造过程产生的主要缺陷之一,其对谐振子的振动特性产生重要的影响。为制定半球谐振质量不平衡评价方法及为修调提供依据,对谐振子的结构特征及质量不平衡进行了表征,通过耦合振动物理模型及仿真分析,明确了谐振子耦合振动产生机理、质量不平衡对频率裂解及支撑损耗的影响。并通过实验,测得了谐振子的不同去除质量下频率裂解特性及耦合振动特性,得到了谐振子质量不平衡与振动特性之间的关系,通过实验数据得出未经过平衡的谐振子1、3次谐波及2次谐波的分布特征,以及它们引入的支撑损耗分别为1.6×10^-8、3.7×10^-9;频率裂解与4次谐波不平衡质量对应关系为0.01 Hz/μg,由此可以对谐振子质量不平衡进行评价及制定调平工艺。     

(S)-5-氧代四氢呋喃-2-甲酸的合成改进

以L-谷氨酸为原料经重氮化、内酯化合成(S)-5-氧代四氢呋喃-2-甲酸。采用超声波处理代替室温长时间搅拌以加快酯化反应,选择频率为30kHz,超声时间8小时,产率为75%。产物通过红外光谱、元素分析、旋光度测试等进行表征。     

倾中外设计名师,造传世精品美筑——“苏州·旺山六境”项目启动国际研讨会

这是一场市与野的兼顾,人工景致与真山真水的对话：承苏州私家园林的内向层次,合山林环境的盎然野趣。这是一次个人化的当代解读,叙述着苏州建筑园林与文化：在山林中的现场,构筑此时此地的建筑。这是一席当代与传统的对话……..全球化与本土化的对话…..     

浅谈强夯法在道路地基处理中的应用

阐述了强夯法的工艺控制标准和基本试验检测方法,并结合工程实际应用案例,说明强夯法适用于杂填土等复杂填土地段进行道路地基处理,可供类似工程施工借鉴。     

Characterization of the stress distribution and evolution inside a thermal barrier coating after initial thermal cycles

The residual stress introduced inside a thermal barrier coating (TBC) during manufacturing and service processes is one of the main causes of thermal barrier failure. The formation and evolution of internal stress in the TBC begin at the early stage of service, but studies on the mechanism of the distribution and evolution of the stress in the TBC during the initial thermal cycle are still lacking. To explore the evolution mechanism of the stress in the TBC interior, an experimental study on the regulation mechanism of the initial thermal cycle on the TBC internal stress was carried out in this paper. First, the internal stress of TBC specimens after thermal cycles was characterized based on photoluminescence spectroscopy (PL) and terahertz time-domain spectroscopy (THz-TDS) technologies, in which the homogenization of the near-interface stress field was observed during the initial thermal cycle. Then, the evolution of the microstructure and phase structure of the TBC specimens was characterized. Finally, the phenomenological model of the evolution of the TBC internal structure was established, revealing that the initial thermal cycle regulated the microstructure of the top coating (TC) through phase transformation to realize the homogenization of the near-interface stress field.     

对聚乙烯醇纤维改性改善成纸性能的研究

该文通过对聚乙烯醇(PVA)纤维改性改善成纸的性能作了研究。对针叶木浆以及瓦楞原纸浆中加入PVA纤维混合抄纸,对纸张物理性能的检测结果表明:加入PVA纤维后,纸样的撕裂度、裂断长及环压指数均有明显的提高。水溶性PVA纤维可作为纸张增强剂及花色纤维应用于纸浆纤维中,成纸有较好的强度,挺度及均匀性,可用于防伪、高档包装等用途。     

运用系统工程工艺学 提高成纱产品质量

通过对清、梳、并、粗、细纵向关系进行研究，提出棉纺工程要以原料为主导，设备服从工艺，工艺服从质量，胶纺半制品是成纱质量的基础，梳并粗工序不仅要重视外观质量，更要重视内在质量。