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Degradation of bisphenol-A using ultrasonic irradiation assisted by low-concentration hydrogen peroxide

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Journal of Environmental Sciences 2011年第1期23卷 31-36页

作者： Kejia Zhang Naiyun Gao Yang Deng tsair fuh lin Yan Ma Lei Li Minghao Sui State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Department of Earth and Environmental Studies Montclair State University Montclair New Jersey 07043 USA Department of Environmental Engineering and Sustainable Environment Research Center 'National' Cheng Kung University Tainan 70101 Taiwan

This study investigated the degradation of bisphenol-A （BPA） by ultrasonic irradiation in the presence of different additives （H2O2, air bubbles and humic acid） under various operating conditions, i.e., ultrasonic frequency, power intensity and power density. The results demonstrated that the BPA degradation followed pseudo first-order kinetics under different experimental conditions. The optimum power intensities were 0.9, 1.8, and 3.0 W/cm2 at the frequencies of 400, 670, and 800 kHz, respectively. At the fixed frequency （800 kHz）, the degradation rate of BPA was shown proportional to the increase of power density applied. With this manner, the BPA sonolysis could be facilitated at H202 dosage being lower than 0.1 mmol/L; while BPA degradation was hindered at H202 concentration in excess of 1 mmol/L. Additionally, BPA removal was shown to be inhibited by the presence of aeration and humic acid during ultrasonic irradiation. The present study suggested that the degradation rate of BPA assisted by ultrasonic irradiation was influenced by a variety of factors, and high BPA removal rate could be achieved under appropriate conditions.

关键词： bisphenol-A (BPA) ultrasonic irradiation power density additives

Cauda equina syndrome caused by the application of DuraSeal^(TM) in a microlaminectomy surgery:A case report

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World Journal of Clinical Cases 2022年第30期10卷 11178-11184页

作者： Kuei-lin Yeh Szu-Hsien Wu Chiou-Shann fuh Yi-Hung Huang Chu-Song Chen Shing-Sheng Wu Department of Orthopaedics Ditmanson Medical Foundation Chia-Yi Christian HospitalChia-Yi City 600Taiwan Department of Computer Science and Information Engineering National Taiwan UniversityTaipei 10617Taiwan Department of Long-Term Care and Management WuFeng UniversityChiayi County 621303Taiwan Department of Physical Medicine and Rehabilitation Taipei Veterans General HospitalTaipei 11217Taiwan Department of Orthopaedics Shin Kong Wu-Ho Su Memorial HospitalTaiepi 111Taiwan

BACKGROUND The management of dural tears is *** a massive dura can be repaired with absorbable suture lines,cerebrospinal fluid leakage can be attenuated by dural sealant when an unintended tiny durotomy occurs *** is often used because it can expand to seal *** case emphasizes the need for caution when DuraSeal is used as high expansion can cause complications following *** SUMMARY A 77-year-old woman presented with L2/3 and L3/4 lateral recess *** underwent microlaminectomy,foraminal decompression,and disk height restoration using an IntraSPINE~? device.A tiny incident durotomy occurred intraoperatively and was sealed using DuraSeal ^(TM).However,decreased muscle power,urinary incontinence,and absence of anal reflexes were observed *** magnetic resonance imaging revealed fluid collection causing thecal sac indentation and central canal *** exploration revealed that the gel-like DuraSeal had entrapped the hematoma and,consequently,compressed the thecal sac and nerve *** we removed all DuraSeal ^(TM) and exposed the nerve root,the patient’s neurological function did not recover *** DuraSeal expansion must not be *** in neurological status require investigation for cauda equina syndrome due to expansion.

关键词： Cauda equina syndrome DuraSeal Microlaminectomy Spinal stenosis Case report

Ti-containing hydrogenated carbon films fabricated by high-power plasma magnetron sputtering

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Transactions of Nonferrous Metals Society of China 2012年第6期22卷 1381-1386页

作者： YANG Peng SUNG Chia-chi fuh Yiin-Kuen CHU Chun-lin LO Chih-hung Department of Engineering Science and Ocean Engineering National Taiwan UniversityTaipeiChina Department of Mechanical Engineering National Central UniversityChung liChina National Nano Device Laboratories HsinchuChina

To improve the characteristics of a diamond-like carbon （DLC） film, Ti-containing amorphous hydrogenated carbon thin films were deposited on sus304 stainless steel substrates by high-power plasma-sputtering with titanium metal as the solid plasma source in a mixed ArC2H2 atmosphere. The films were fabricated to obtain a multilayered structure of Ti/TiC/DLC gradient for improving adhesion and reducing residual stress. The effects of substrate bias and target-substrate distance on the films＇ properties were studied by glow discharge spectroscope, X-ray diffractometer, Raman spectroscope, nanoindenter, and a pin-on-disk tribometer. The results indicate that the films possess superior adhesive strength and toughness.

关键词： high-power plasma-sputtering Me-DLC diamond-like carbon

Performance Analysis on Output SINR of Robust Two-Stage Beamforming

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Journal of Signal and Information Processing 2011年第1期2卷 37-43页

作者： Tsui-Tsai lin fuh-Hsin Hwang Juinn-Horng Deng Department of Communication Engineering Yuan Ze University Taoyuan Taiwan Department of Electronic Engineering National United University Miaoli Taiwan Department of Optoelectronics and Communication Engineering National Kaohsiung Normal University Kaohsiung Taiwan

In this paper, we present a theoretical analysis of the output signal-to-interference-plus-noise ratio (SINR) for eigen-space beamformers so as to investigate the performance degradation caused by large pointing errors. For the sake of reducing such performance loss, a robust scheme, which consists of two cascaded signal processors, is proposed for adaptive beamformers. In the first stage, an algorithm possessing time efficiency is developed to adjust the direc-tion-of-arrival (DOA) estimate of the desired source. Based the achieved DOA estimate, the second stage provides an eigenspace beamformer combined with the spatial derivative constraints (SDC) to further mitigate the cancellation of the desired signal. Analysis and numerical results have been conducted to verify that the proposed scheme yields a better robustness against pointing errors than the conventional approaches.

关键词： Beamforming Large Pointing Error Output Signal-To-Interference-Plus-Noise Ratio (SINR) Eigenspace Beamformer Two-Stage

Energy and Exergy Analysis of a New Small Concentrating Solar Power Plant

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Energy and Power Engineering 2013年第4期5卷 300-305页

作者： Heng-Yi Li tsair-fuh Huang Meng-Chang Tsai Yung-Woou Lee Shing-Lei Yuan Ming-Jui Tsai Chi-Fong Ai Physics Division Institute of Nuclear Energy Research Taoyuan Chinese Taipei

A new small concentrating solar power plant which is suitable for urban area is presented, and a theoretical framework for the energy and exergy analysis in the overall power plant is also constructed. The framework can be used to evaluate the energy and exergy losses in each component. Furthermore, the energy and exergy efficiencies have also been computed and compared for the individual components as well as for the overall plant.

关键词： Exergy Analysis Concentrating Solar Power Thermal Energy Storage Stirling Engine

基于熔池运动特征的选区激光熔融过程状态检测方法

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计算机集成制造系统 2021年第12期27卷 3403-3415页

作者：朱锟鹏王齐胜林昕傅盈西中国科学院合肥物质科学研究院智能机械研究所先进制造技术研究中心江苏常州213164 常州先进制造技术研究所江苏常州213164 武汉科技大学机械自动化学院湖北武汉430081 新加坡国立大学新国大苏州研究院江苏苏州215123

选区激光熔融是一种极具发展前景的金属增材制造技术,由于加工过程容易产生各种缺陷,过程监控对于产品质量的控制显得尤为重要。熔池变化特征是最有效的监测手段之一,但是传统的熔池几何特征缺乏与不同熔化状态的准确对应关系。针对该问... 详细信息

选区激光熔融是一种极具发展前景的金属增材制造技术,由于加工过程容易产生各种缺陷,过程监控对于产品质量的控制显得尤为重要。熔池变化特征是最有效的监测手段之一,但是传统的熔池几何特征缺乏与不同熔化状态的准确对应关系。针对该问题,根据熔池特点提出一种新的熔池运动特征用于描述运动熔池的变化规律。首先利用激光扫描位置数据确定熔池的移动方向及质心,然后通过设定3个不同尺度的阈值来捕捉飞溅,并结合连通分量分析方法提取熔池区域和飞溅,进一步消除熔池感兴趣区域中的飞溅。接着将熔池质心到熔池边界轮廓的距离按顺时针方向展开,获得一个36维的矢量特征用于描述运动的熔池。最后,利用k均值聚类算法分别对同一工艺参数和不同工艺参数下获取的熔池进行了聚类分析,并与传统的熔池几何特征进行了对比。实验结果表明,提取的36维熔池运动特征可以较好地区分熔池移动方向及不同的熔化状态,为选区激光熔融过程在线监控提供了一种新的思路。

关键词：选区激光熔融熔池运动特征熔池轮廓连通分量分析 k均值聚类增材制造

基于图像语义分割与图卷积的选区激光熔融成形过程羽流运动特征分析

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机械工程学报 2024年第12期60卷 168-182页

作者：林昕毛杨坤傅盈西朱锟鹏武汉科技大学精密制造研究院武汉430081 武汉科技大学冶金装备及其控制教育部重点实验室武汉430081 中国科学院合肥物质科学研究院智能机械研究所合肥230031 新加坡国立大学新国大苏州研究院苏州215123

现有的研究中羽流已被证明与选区激光熔融加工过程有着密切关系且影响了最终成形质量,如何利用羽流等监测信息揭示选区激光熔融成形过程中熔融状态,是选区激光熔融成形过程监测被广泛关注的重要原因之一。为了更加完善地描述羽流信息,采... 详细信息

现有的研究中羽流已被证明与选区激光熔融加工过程有着密切关系且影响了最终成形质量,如何利用羽流等监测信息揭示选区激光熔融成形过程中熔融状态,是选区激光熔融成形过程监测被广泛关注的重要原因之一。为了更加完善地描述羽流信息,采用Deeplabv3+网络对图像进行语义分割,并使用标记图法建立一维的羽流形态特征;同时结合时序信号,构建图卷积自编码器与分类器,提出一种基于图结构的羽流运动特征,并进行聚类,得到熔融状态分类,讨论加工过程中羽流运动特征和熔融状态的关系。采用图卷积编码羽流动态特征,实现特征建立与熔融状态识别,并通过输出图卷积表征值,对图卷积在羽流特征提取中的应用进行可解释性分析。结果表明,提出的羽流特征能够实现五类熔融状态的识别且准确率达到了81.52%,并通过可解释性分析了羽流动态特征与熔融状态的内在关系,为选区激光熔融成形过程中监测信号与成形质量映射关系研究提供了新的思路。

关键词：选区激光熔融图卷积过程监测羽流运动特征深度学习

基于目标检测的选区激光熔融成形过程熔池与飞溅监测

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机械工程学报 2023年第9期59卷 335-348页

作者：毛杨坤段现银林昕傅盈西朱锟鹏中国科学院合肥物质科学研究院智能机械研究所合肥230031 中国科学技术大学合肥230026 武汉科技大学冶金装备及其控制教育部重点实验室武汉430081 新加坡国立大学苏州研究院苏州215123 常州先进制造技术研究所常州213164

在选区激光熔融成形过程中,飞溅与熔池包含了能够体现加工质量的重要特征信息,从成形过程采集到的熔池图像中,获得这些信息,实现选区激光熔融的过程监测是近年来研究的重点之一。为了更加精确且有效地从图像中提取熔池和飞溅的信息,提... 详细信息

在选区激光熔融成形过程中,飞溅与熔池包含了能够体现加工质量的重要特征信息,从成形过程采集到的熔池图像中,获得这些信息,实现选区激光熔融的过程监测是近年来研究的重点之一。为了更加精确且有效地从图像中提取熔池和飞溅的信息,提出了一种基于YOLOv5目标检测模型,实现了对成形过程图像中飞溅与熔池的实时定位与捕获。首先,以YOLOv5s目标检测网络为基础,调整骨干网络的深度与宽度,修改检测头的数量。之后,引入自校正卷积与CBAM注意力机制模块,设计了新的特征整合结构,通过上述步骤,提升了网络的检测性能。将工业相机采集到的图像制作为目标检测数据集,进行模型的训练与测试,结果表明该网络能够从原始图像中对飞溅与熔池目标进行准确的定位,在具有良好的检测精度的同时,网络模型的参数量极少,更加符合工业应用的需求。网络的检测精度mAP@0.5:0.95达到了0.466,为基于图像的选区激光熔融过程监测提供了一种新的方法。

关键词：选区激光熔融目标检测过程监测熔池图像

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机翼截面柱体的弯曲和扭转问题

固体力学学报 1980年第2期 218-233页

作者：王开福复旦大学

本文研究了一系列变厚度的对称机翼截面柱体的圣维南弯曲和扭转问题.机翼截面柱体悬空端所加外力的方向与柱体的对称面垂直,且通过重心.这类问题一般会产生弯曲和扭转.对称机翼的尾角一般用2η0(=π/2k)表示,其中k为调整机翼厚度的参数... 详细信息

本文研究了一系列变厚度的对称机翼截面柱体的圣维南弯曲和扭转问题.机翼截面柱体悬空端所加外力的方向与柱体的对称面垂直,且通过重心.这类问题一般会产生弯曲和扭转.对称机翼的尾角一般用2η0(=π/2k)表示,其中k为调整机翼厚度的参数。当k=1时,文献求出了问题的解;当k=2时,文献只得到了问题的扭转函数;当k等于任意正整数时,林同骥在1956年的国际力学会议上宣读了他的研究结果;但这个研究结果,仍未使问题彻底解决.例如,尾角在45°>η0>22.5°,22.5°>η0>15°,…π/4k>η0>π/4(k+1),…,的范围内就不能解决. 为此本文研究了当k等于任意正有理数时问题的精确解.本文最后给出例子,并作出沿截面边界上的剪切应力分布图;同时指出文献[1]、[2]和[3]的结果都是本文结果的特例.

关键词：函数虚部消去边界条件开福机翼截面待定系数方程组联立方程代入恒等式四种类型力学学报柱体