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Precise separation and efficient recovery of Pd(Ⅱ) from high-level liquid waste by XAD-based adsorbents

Rare Metals 2024年第10期43卷 5372-5390页

作者： Hao-Ran Dong Shun-Yan Ning Zeng-Yuan li Si-Zhi Xu feng-Tao Hu feng Gao You-Bin Wang li-feng chen Xiang-Biao Yin Toyohisa Fujita Mohammed F.Hamza Yue-Zhou Wei School of Resources Environment and MaterialsGuangxi University School of Nuclear Science and Technology University of South China

Efficient separation of palladium (Pd（II）) from high-level liquid waste （HLLW） not only helps the safe disposal of nuclear waste,but also is a vital importan supplement to Pd（II） ***,16 kinds of nove Amberlite XAD resins-based adsorbents were prepared by vacuum impregnation method for the separation of Pd（II）from simulated HLLW,and the MMBT/XAD7HP prepared using 4-methyl-2-mercaptobenzothiazole （MMBT） as ligand and Amberlite XAD7HP resin （XAD7HP） as the carrier was selected as the optimal research *** analysis experiments proved the successful preparation of MMBT/XAD7HP,which exhibited ultrahigh adsorption selectivity for Pd（II）(distribution coefficient （Kd）≥12584.5 ml·g-1,separation factor (SFPd/M)≥2818.4) and superior adsorption capacity(Q≥130.1 mg·g-1).The adsorption kinetics and adsorption isotherms for Pd（II） matched with pseudo-secondorder （PSO） kinetics model and Langmuir model,indicating that the adsorption mode for Pd（II） by MMBT/XAD7 HP was monolayer chemical *** dynamic column experiments showed that MMBT/XAD7 HP achieved efficiently separation of Pd（II） from simulated HLLW,and the recovery rate was nearly 100% The adsorption mechanism was analyzed by Fourier transform infrared spectroscopy （FTIR）,X-ray photoelectron spectroscopy （XPS） and density functional theory（DFT）,and the ultrahigh selectivity of MMBT/XAD7 HP is attributed to the preferred affinity of the soft-N,S donor atoms in MMBT for Pd（II）.MMBT has the shortest frontline molecular orbital energy band gap （HOMO–LUMO） among the four ligands,which makes it easier to become an electron donor to attract Pd2+to participate in ***3-participates in the adsorption to keep charge *** summary,MMBT/XAD7 HP has broad application prospects for the treatment of Pd（II） in HLLW

关键词： Adsorption Column experiments HLLW Palladium XAD

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Experimental and Numerical Investigation on the Ultimate Strength of Stiffened Plates with Scanned Initial Geometrical Imperfection

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China Ocean Engineering 2019年第4期33卷 446-458页

作者： YU Yang-zhe feng Guo-qing li chen-feng REN Hui-long College of Shipbuilding Engineering Harbin Engineering University

The study of the ultimate strength of stiffened plates is a hot topic in ocean engineering. The ultimate strength and behavior of collapse of stiffened plates were investigated using experimental and numerical methods. Two stiffened plates, with one and two half-bays in both longitudinal and transverse directions, were tested under the uniaxial compression. There were clamped boundaries at both ends of the stiffened panels and a restrained boundary on the transverse frames. The novel three-dimensional laser scanning technology was used to measure the initial geometric imperfections and the ultimate deformation of the stiffened panels after the test. The initial geometric deformation was imported into the finite element model, and the ultimate strength and behavior of collapse of the stiffened plates were calculated using the finite element analysis. FE analysis results based on the measured initial geometric imperfections were compared with the test results. It is concluded that structural deformation can be well measured by three-dimensional laser scanning technology, and can be conveniently imported into the finite element analysis. With the measured initial geometric imperfections considered, the FE analysis results agree well with the experimental results in ultimate strength, behavior of collapse, and the ultimate displacement distribution of the stiffened panels.

关键词： Stiffened plate ultimate strength experiment three dimensional laser scanning initial geometric imperfection

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HEAT-RESISTANT COMPOSITES CURED BY ELECTRON BEAM

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Chinese Journal of Polymer Science 2001年第1期19卷 53-57页

作者： Jian-wen Bao Yang li Xiang-bao chen feng-mei li National Key Lab of Advanced Composites Institute of Aeronautical Materials Beijing 100095 China National Key Lab of Advanced Composites Institute of Aeronautical Materials Beijing 100095 China National Key Lab of Advanced Composites Institute of Aeronautical Materials Beijing 100095 China Institute of Low Energy Nuclear Physics Beijing Normal University Beijing 100877 China

Electron beam (EB) curing of composites has many advantages. Heat-resistant EB-curing composites could substitute polyimide composites used in aeronautical engines. In this paper, the effects of catalyst and dose on the cured resin were investigated. The heat-resistance of the resin cured by EB was evaluated by dynamic mechanical analysis (DMA). The experimental results show that the mechanical properties of the composites cured by EB could meet the specifications of aeronautical engines at 250 degreesC.

关键词： electron beam curing composites epoxy heat-resistance

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Electrophysiological changes of autonomic cells in left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with chronic heart failure

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Asian Pacific Journal of Tropical Medicine 2017年第12期10卷 1197-1200页

作者： ling Fan li-feng chen Jing Fan Department of Hematology The First Affiliated Hospital of Hebei North University Department of Physiology Basic Medical College Hebei North University Department of Obstetrics and Gynecology The Sixth Hospital of Zhangjiakou

Objective: To investigate the electrophysiological changes of autonomic cells in left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with chronic heart ***: Guinea pigs model of iron deficiency anemia complicated with chronic heart failure in 10 guinea pigs of the experimental group was made by feeding a low iron diet,pure water and subcutaneous injection of isoproterenol. The control group consisting of 11 guinea pigs was given normal food, normal water and injected with normal saline. The left ventricular outflow tract model specimen was also prepared. The standard microelectrode technique was used to observe electrophysiological changes of autonomic cells in the outflow tract of left ventricular heart failure complicated with iron deficiency anemia in guinea pig model. The indicators of observation were maximal diastolic potential, action potential amplitude, 0 phase maximal depolarization velocity, 4 phase automatic depolarization velocity, repolarization 50% and 90%, and spontaneous discharge ***: Compared with the control group, 4 phase automatic depolarization velocity,spontaneous discharge frequency and 0 phase maximal depolarization velocity decreased significantly(P litude reduced(P lities of the left ventricular outflow tract in guinea pigs with iron deficiency anemia complicated with heart failure.

关键词： Iron deficiency anemia Chronic heart failure Guinea pig model Autonomic cells Left ventricular outflow tract Electrophysiology

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两种塑料电镀工艺的耐腐蚀性能研究

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环境技术 2024年第2期42卷 111-116页

作者：陈敏娟李经奇余晓杰许巍巍陈俐峰吉利汽车研究院(宁波)有限公司宁波315336

通过塑料电镀黑铬件、塑料电镀白铬件在铜加速乙酸盐雾试验及整车强化腐蚀试验中的腐蚀表征,对比两种塑料电镀工艺的耐腐蚀性能的差异;通过铜加速乙酸盐雾试验、整车强化腐蚀试验对两种电镀工艺的耐腐蚀性能进行分析,结果表明黑铬工艺... 详细信息

通过塑料电镀黑铬件、塑料电镀白铬件在铜加速乙酸盐雾试验及整车强化腐蚀试验中的腐蚀表征,对比两种塑料电镀工艺的耐腐蚀性能的差异;通过铜加速乙酸盐雾试验、整车强化腐蚀试验对两种电镀工艺的耐腐蚀性能进行分析,结果表明黑铬工艺的耐腐蚀性能弱于白铬电镀工艺,并通过SEM分析对其耐腐蚀性能的差异进行机理分析。

关键词：塑料电镀件腐蚀试验黑铬

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Biotemplated synthesis of three-dimensional porous MnO/C-N nanocomposites from renewable rapeseed pollen： An anode material for lithium-ion batteries

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Nano Research 2017年第1期10卷 1-11页

作者： li-feng chen Sheng-Xiang Ma Shu Lu Yue feng Jia Zhang Sen Xin Shu-Hong Yu Division ofNanomatefials & Chemistry Hefei National Laboratory for Physical Sciences at Microscale Collaborative Innovation Center of Suzhou Nano Science and Technology CAS Center for Excellence in Nanoscience Department of Chemistry Department of Materials Science & Engineering University of Science and Technology of China Hefei 230026 China Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering School of Chemical Engineering Hefei University of Technology Hefei 230009 China

lithium-ion batteries （liBs） are currently recognized as one of the most popular power sources available. To construct advanced liBs exhibiting long-term endurance, great attention has been paid to enhancing their poor cycle stabilities. As the performance of liBs is dependent on the electrode materials employed, the most promising approach to improve their life span is the design of novel electrode materials. We herein describe the rational design of a three-dimensional （3D） porous MnO/C-N nanoarchitecture as an anode material for long cycle life liBs based on their preparation from inexpensive, renewable, and abundant rapeseed pollen （R-pollen） via a facile immersion-annealing route. Remarkably, the as-prepared MnO/C-N with its optimized 3D nanostructure exhibited a high specific capacity （756.5 mAh·g^-1 at a rate of 100 mA·g^-1）, long life span （specific discharge capacity of 513.0 mAh·g^-1, -95.16% of the initial reversible capacity, after 400 cycles at 300 mA·g^-1）, and good rate capability. This material therefore represents a promising alternative candidate for the high-performance anode of next-generation liBs.

关键词： 3D porous MnO/C-Nnanocomposite rapeseed pollen renewable biomass lithium-ion batter long cycle life

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基于密集残差网络的图像隐藏方案

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科学技术与工程 2024年第9期24卷 3719-3726页

作者：陈立峰刘佳潘晓中孙文权董炜娜武警工程大学密码工程学院西安710086

针对基于编-解码器网络的图像隐写方案生成的含密图像和消息图像质量不高的问题,提出了一种新的基于密集残差连接的编码器-解码器隐写方案,与现有的端到端图像隐写网络不同,所提方案无须对图像进行预处理,采用密集残差连接,将浅层网络... 详细信息

针对基于编-解码器网络的图像隐写方案生成的含密图像和消息图像质量不高的问题,提出了一种新的基于密集残差连接的编码器-解码器隐写方案,与现有的端到端图像隐写网络不同,所提方案无须对图像进行预处理,采用密集残差连接,将浅层网络的特征输送到深层网络结构的每一层,有效地保留了特征图的细节信息,并使用通道和空间注意力模块对特征进行筛选,提高了编-解码器对图像复杂纹理区域的关注度。在LFW、PASCAL-VOC12和ImageNet数据集的实验结果表明,在保证算法安全性的前提下,所提方法能够有效提高图像质量,含密图像和载体图像的峰值信噪比(peak signal-to-noise ratio,PSNR)和结构相似性(structural similarity,SSIM)的平均值最高达到了36.2 dB和0.98。

关键词：信息隐藏深度学习注意力机制编码-解码结构密集残差网络

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拟人工黑体结构的带隙设计阵列化降噪特性研究

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节能技术 2024年第4期42卷 291-298,305页

作者：杨嘉明许如航李小斌李凤臣天津大学机械工程学院先进内燃动力全国重点实验室天津300350

为了解决噪声污染对人居环境带来的不利影响,基于声子晶体带隙原理,受人工黑体结构启发,提出了拟人工黑体结构的开口管状阵列的带隙降噪结构设计,利用平面波在阵列之间以及管状结构内部的干涉相消达到降噪效果。使用数值模拟和实验研究... 详细信息

为了解决噪声污染对人居环境带来的不利影响,基于声子晶体带隙原理,受人工黑体结构启发,提出了拟人工黑体结构的开口管状阵列的带隙降噪结构设计,利用平面波在阵列之间以及管状结构内部的干涉相消达到降噪效果。使用数值模拟和实验研究的方法,对比分析了不同因素对降噪效果的影响,从晶体阵列排布形式、法向排数及开口角度大小等角度出发,进行了参数化影响因素分析。结果表明,该带隙设计的阵列化结构可有效降低噪声。其中高频段传输损失可达100 dB以上,低频段也可达30~45 dB。该研究对典型场景的降噪需求的设计具有重要参考价值。

关键词：降噪拟人工黑体声子晶体阵列布置带隙设计频谱分析

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Effects of probiotic therapy on hepatic encephalopathy in patients with liver cirrhosis:an updated meta-analysis of six randomized controlled trials

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Hepatobiliary & Pancreatic Diseases International 2014年第4期13卷 354-360页

作者： Jun Xu Rui Ma li-feng chen li-Jun Zhao Kan chen Ren-Bing Zhang Department of Surgery Zhejiang University Hospital Zhejiang University

BACKGROUND： liver cirrhotic patients with hepatic encephalopathy have poor prognosis. Probiotics alter the intestinal microbiota and reduce the production of ammonia. We conducted a meta-analysis about the role of probiotics on liver cirrhotic patients with hepatic *** SOURCES： We collected the relevant literatures up to February 21, 2014 from databases of PubMed, EMBASE and the Cochrane Central Register of Controlled Trials. A statistical analysis was conducted by RevMan 5.2 and STATA 12.0 ***： Six randomized controlled trials involving 496 liver cirrhotic patients were included. The results showed that probiotic therapy significantly reduced the development of overt hepatic encephalopathy（OR [95% CI]： 0.42 [0.26, 0.70],P=0.0007）. However, probiotics did not affect mortality, levels of serum ammonia and constipation（mortality： OR [95% CI]：0.73 [0.38, 1.41], P=0.35; serum ammonia： WMD [95% CI]：-3.67 [-15.71, 8.37], P=0.55; constipation： OR [95% CI]： 0.67 [0.29,1.56], P=0.35）.CONCLUSION： Probiotics decrease overt hepatic encephalopathy in patients with liver cirrhosis.

关键词： probiotics hepatic encephalopathy liver cirrhosis ammonia meta-analysis

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集体语言训练联合经颅直流电刺激对语言发育迟缓患儿发育水平、言语功能及神经中枢营养因子水平的影响

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现代生物医学进展 2024年第6期24卷 1166-1170页

作者：张媛陈立峰陈薇贺友何飞平郴州市第一人民医院儿童康复中心湖南郴州423000

目的:探讨集体语言训练联合经颅直流电刺激(t DCS)对语言发育迟缓患儿发育水平、言语功能及神经中枢营养因子水平的影响。方法:采用信封抽签法将郴州市第一人民医院2021年2月到2023年2月期间收治的90例语言发育迟缓患儿分为对照组(n=45... 详细信息

目的:探讨集体语言训练联合经颅直流电刺激(t DCS)对语言发育迟缓患儿发育水平、言语功能及神经中枢营养因子水平的影响。方法:采用信封抽签法将郴州市第一人民医院2021年2月到2023年2月期间收治的90例语言发育迟缓患儿分为对照组(n=45,常规语言训练联合t DCS)和研究组(n=45,集体语言训练联合t DCS)。对比两组疗效、发育水平、言语功能、神经中枢营养因子及生活质量。结果:与对照组相比,研究组的临床总有效率更高(P0.05)。两组干预后生理功能、社会功能、情感功能、角色功能评分升高,且研究组高于对照组(P<0.05)。结论:集体语言训练联合t DCS干预语言发育迟缓患儿,可改善言语功能和神经功能,提高其发育水平和生活质量。

关键词：集体语言训练经颅直流电刺激语言发育迟缓发育水平言语功能神经中枢营养因子

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