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Graphene from microwave-initiated upcycling of waste polyethylene for electrocatalytic reduction of chloramphenicol

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Chinese Chemical Letters 2024年第4期35卷 187-192页

作者： Qiang Cao Xue-Feng Cheng Jia Wang Chang Zhou liu-jun Yang Guan Wang Dong-Yun Chen Jing-Hui He Jian-Mei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou 215123China

Waste polyolefin plastics, accounting for 50% of all plastic waste, represent a tremendously unexploited carbon source. Efficiently upcycling polyolefin waste into value-added carbon materials for waste water treatment avoiding using noble metals is challenging but economically and environmentally sustainable. In this work, MAX-Ti_(3)AlC_(2) supported Fe selectively catalyzes polyolefin into few-layered graphene in 5 min under microwave treatment. Graphene and MAX supported Fe(Fe@MLC) can completely(99.9%)degrade chloramphenicol(CAP) within 60 min, retain robust after 10 cycles and work efficiently at a wide p H range(3.87–13.03), avoiding the usage of noble metal. Moreover, the electrochemical active surface area(ECSA) of Fe@MLC is 2.7 times higher than that of commercial Pt/C. This work provides a cheap and efficient catalyst that promotes deconstruction of plastic wastes and indirectly degrades antibiotics thereby realizes the treatment of waste water with waste plastic.

关键词： Microwave Ti_(3)AlC_(2) Electrochemistry Dechlorination Chloramphenicol

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Ultrafast pulse-dilation framing camera and its application for time-resolved X-ray diagnostic

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Nuclear Science and Techniques 2024年第7期35卷 101-114页

作者： Hou-Zhi Cai Qiu-Yan Luo Kai-Xuan Lin Xuan Deng jun-Kai liu Kai-Zhi Yang Dong Wang Jia-Jie Chen Jia-Heng Wang Jing-Hua Long Li-Hong Niu Yun-Fei Lei Jin-Yuan liu Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen Key Laboratory of Photonics and BiophotonicsCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060China

An ultrafast framing camera with a pulse-dilation device,a microchannel plate(MCP)imager,and an electronic imaging system were *** camera achieved a temporal resolution of 10 ps by using a pulse-dilation device and gated MCP imager,and a spatial resolution of 100μm by using an electronic imaging system comprising combined magnetic *** spatial resolution characteristics of the camera were studied both theoretically and *** results showed that the camera with combined magnetic lenses reduced the field curvature and acquired a larger working area.A working area with a diameter of 53 mm was created by applying four magnetic lenses to the ***,the camera was used to detect the X-rays produced by the laser-targeting *** diagnostic results indicated that the width of the X-ray pulse was approximately 18 ps.

关键词： Inertial confinement fusion Plasma diagnostics Framing camera Combined lenses Pulse-dilation

Theoretical Exploration of Alloying Effects on Stabilities and Mechanical Properties ofγʹPhase in Novel Co–Al–Nb-Base Superalloys

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1238-1248页

作者： Guan-Cheng Gu Zhao-Jing Han Ze-Yu Chen Zhao-Xuan Li Sheng-Bao Xia Zheng-Ning Li Hua Jin Wei-Wei Xu Xing-jun liu Shenzhen Research Institute of Xiamen University School of Aerospace EngineeringXiamen UniversityXiamen361005China Institute of Materials Genome and Big Data Harbin Institute of TechnologyShenzhen518055China

The new developedγ/γʹCo–Al–Nb-base alloys show great potentials as high-temperature ***,finding appropriate compositions to improve performance of alloys still poses a great challenge to the development of Co–Al–Nb-base *** by the lack of alloying effects on fundamental properties of criticalγʹphase,we systematically performed a theoretical investigation on the effect of alloying elements TM(TM:Ti,V,Cr,Zr,Mo,Ta,W,Re,and Ru)on phase stabilities and mechanical properties of L1_(2)-typeγʹ(Co,Ni)_(3)(Al,Nb).By analyzing the stability ofγʹphase with respect to its competitive B2 and D0_(19) phases,the results shown that Ti,V,and Cr enhance the L1_(2) stability and widen the L1_(2)–D0_(19) energy barrier,in which V yields the maximum *** analysis of electronic structure indicated that the alternation of valence electrons at fermi level would be the atomic origin for doping TM inγʹ*** calculated results of mechanical properties shown that V and Cr are expected to be optimal dopant for enhancing the strength and the ductility ofγʹ*** addition of Ta is also beneficial for enhancing the strength at the slight expense of ductility ofγʹ*** drawing the mechanical maps,the preferred composition range for the phases with desired properties is roughly demarcated in theory for the multi-addition of V/Cr and V/Ta inγʹ*** findings would be useful for optimizing the performance of novelγ/γʹCo–Al–Nb-base superalloys.

关键词： Co-Al-Nb-base superalloys γ/γʹdual-phase Phase stability Mechanical properties First-principle methods

Low-noise and low-power pixel sensor chip for gas pixel detectors

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Nuclear Science and Techniques 2024年第3期35卷 142-152页

作者： Zhuo Zhou Shi-Qiang Zhou Dong Wang Xiang-Ming Sun Chao-Song Gao Peng-Zhen Zhu Wei-Ping Ren jun liu Mu-Xian Li Chen Lian Chun-Lai Dong PLAC Key Laboratory of Quark and Lepton Physics(MOE)Central China Normal UniversityWuhan 430079China

Topmetal-M2 is a large-area pixel sensor chip fabricated using the GSMC 130 nm CMOS process in *** pixel array of Topmetal-M2 consists of pixels of 400 rows×512 columns with a pixel pitch of 45μm×45μ*** array is divided into 16 subarrays,with pixels of 400 rows×32 columns per *** pixel incorporates two charge sensors:a diode sensor and a Topmetal *** in-pixel circuit primarily consists of a charge-sensitive amplifier for energy measurements,a discriminator with a peak-holding circuit,and a time-to-amplitude converter for time-of-arrival *** pixel of Topmetal-M2 has a charge input range of~0-3 k e-,a voltage output range of~0-180 mV,and a charge-voltage conversion gain of~59.56μV∕e-.The average equivalent noise charge of Topmetal-M2,which includes the readout electronic system noise,is~43.45 e-.In the scanning mode,the time resolution of Topmetal-M2 is 1 LSB=1.25μs,and the precision is^()7.41μ*** an operating voltage of 1.5 V,Topmetal-M2 has a power consumption of~49 mW∕cm~*** this article,we provide a comprehensive overview of the chip architecture,pixel working principles,and functional behavior of ***,we present the results of preliminary tests conducted on Topmetal-M2,namely,alpha-particle and soft X-ray tests.

关键词： Charge collection Gas detectors Semiconductor detectors X-ray detectors

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Clinical efficacy and safety of flexible ureteroscopy and percutaneous nephrolithotomy for large kidney stones:A retrospective comparative study

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World Journal of Clinical Cases 2024年第21期12卷 4483-4490页

作者： Qiu-Lian Wang jun-Qiang liu Juan Cao jun Ding Department of Urology No.904 Hospital of Joint Logistic Support Force of PLAWuxi 214044Jiangsu ProvinceChina

BACKGROUND Renal stones ranging 20–40 mm are very common in *** no largesample clinical studies have confirmed the clinical efficacy and safety of this method,there is also a lack of comparative data with traditional *** To investigate the clinical efficacy of flexible ureteroscopy(FURS)and percutaneous nephrolithotomy(PCNL)by postoperative stone clearance and changes in soluble vascular cell adhesion molecule 1(sVCAM-1)and kidney injury molecule 1(KIM-1)levels in patients with large kidney stones(>2 cm in diameter).METHODS This single-center observational study was performed at a Chinese hospital between January 1,2021,and October 30,*** 250 enrolled patients were diagnosed with large kidney stones(>2 cm)and divided into a FURS group(n=145)and a PCNL group(n=105)by the surgical *** FURS group was treated with flexible ureteroscopy and the PCNL group was treated with percutaneous *** operation time,time to palinesthesia,intraoperative blood loss,drop in hemoglobin,length of hospital stay,stone clearance rate,and complications were recorded in the two *** and postoperative serum sVCAM-1 levels,erythrocyte sedimentation rate(ESR),urine KIM-1 levels,preoperative and postoperative pain visual analog scale(VAS)and Wisconsin Stone Quality of Life Questionnaire(WISQOL)scores were also *** All 250 eligible patients completed the *** were no significant differences in baseline characteristics between the two groups(P>0.05).The operation time in the FURS group was significantly greater than that in the PCNL *** time to ambulation,intraoperative blood loss,decrease in hemoglobin,and length of hospital stay were significantly lower in the FURS group than in the PCNL *** FURS group also had a significantly higher stone clearance rate and a lower incidence of postoperative *** was no significant difference in antibiotic use between the *** serum

关键词： Kidney stones Flexible ureteroscopy Percutaneous nephrolithotomy Clinical effective SCM-1 Erythrocyte sedimentation rate Kidney injury molecule 1

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从释褐等级看北魏辽东政治圈的整体地位

中国边疆史地研究 2024年第2期034卷 32-40,222页

作者：刘军吉林大学古籍研究所 130012

为进一步探讨北魏辽东政治圈及其群体构造和内部关系,把握北朝贵族社会之体制特性,借助仕进程序中浓缩家世信息的释褐环节,对该集团所属四大代表家族弘农杨氏、乐浪王氏、昌黎韩氏、辽东高氏进行集成式的量化统计,也能导出大致相同的结... 详细信息

为进一步探讨北魏辽东政治圈及其群体构造和内部关系,把握北朝贵族社会之体制特性,借助仕进程序中浓缩家世信息的释褐环节,对该集团所属四大代表家族弘农杨氏、乐浪王氏、昌黎韩氏、辽东高氏进行集成式的量化统计,也能导出大致相同的结论,即门第二品之一般高门。这是因为释褐作为仕途出身,固定与阀阅世资按特定比例紧密搭配,从而形成彝伦攸叙、各安其分的流品秩序。释褐等级是家世门第的象征,自然可以衡量家族乃至集团的整体地位。释褐同时又是政治文化展演的重要组成部分,乃内徙族裔华夏化、士族化,标榜全新身份的标志。

关键词：北魏辽东政治圈释褐流品士族化政治地位

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魏晋公府从事中郎考述

中南大学学报（社会科学版） 2024年第3期30卷 201-212页

作者：刘军吉林大学古籍研究所吉林长春130012

魏晋时期,诸公及位从公的统兵幕府专设从事中郎一职。魏晋公府的从事中郎不再是以皇帝私属家臣身份督军的耳目,而是府君信赖的心腹僚属,与长官维持紧密的附庸关系。其地位介于长史、司马和参军、掾吏之间,作为高级行政助理,有权过问本... 详细信息

魏晋时期,诸公及位从公的统兵幕府专设从事中郎一职。魏晋公府的从事中郎不再是以皇帝私属家臣身份督军的耳目,而是府君信赖的心腹僚属,与长官维持紧密的附庸关系。其地位介于长史、司马和参军、掾吏之间,作为高级行政助理,有权过问本府咨议、机要、人事、指挥、法宪等事务,并可全权代表府主办事,乃幕府纲纪显职。从事中郎的选任资格与乡品三品固定搭配,阀阅世资以高门士族为主,兼采优秀寒素。其仕宦履历不乏专属乡品二品的清要职位,晋升过程相互衔接司空见惯,反映当时门阀大幕虽已拉开,但对流孔道尚未完全封闭。从事中郎仕途的末段普遍跻身三品官,反证乡品对仕宦前景具有等位的预期功能。中正主观评议的乡品不同于单纯核算世资的门品,这是研究从事中郎及其他职官必须加以细致区分的。

关键词：魏晋幕府从事中郎流品秩序阀阅世资乡品

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基于改进WGAN考虑特征分布相似性的小样本负荷预测方法

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控制理论与应用 2024年第4期41卷 597-608页

作者：卢俊菠刘俊峰罗燕曾君华南理工大学自动化科学与工程学院广东广州510640 华南理工大学电力学院广东广州510640

对于综合能源系统中新接入用户,其往往由于历史数据匮乏而难以建立精准的短期负荷预测模型.本文基于迁移学习理论,提出了一种基于改进Wasserstein生成对抗网络(WGAN)的小样本负荷预测方法.首先,本文采用最大信息系数法量化各影响特征与... 详细信息

对于综合能源系统中新接入用户,其往往由于历史数据匮乏而难以建立精准的短期负荷预测模型.本文基于迁移学习理论,提出了一种基于改进Wasserstein生成对抗网络(WGAN)的小样本负荷预测方法.首先,本文采用最大信息系数法量化各影响特征与负荷的相关性强弱.接着,将源域特征序列进行分割,计算各分割子序列与目标域小样本的实序列编辑距离确定初始源域.然后,引入卷积神经网络和长短期记忆模型建立源域预测网络.通过WGAN对齐目标域和源域负荷特征的空间分布,并在最优传输代价函数中加入局部特征损失以提高训练的稳定性和快速性.最后,将对抗训练后网络用于目标域负荷预测.采用该方法对某地区小样本负荷进行实验,结果表明,本文所提算法与其他预测模型相比能达到更高精度.

关键词：负荷预测迁移学习小样本改进Wasserstein生成对抗网络特征分布最优传输

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对抗速朽:对当代数字视听文化的批判性反思

编辑之友 2024年第2期 14-20页

作者：刘俊中国传媒大学传媒艺术与文化研究中心北京100024

基于对当下代表性数字视听内容样态的分析,文章探讨数字视听文化迭进的规律,并立足于媒介文化的历史与社会角色展开反思。通过对网络综艺、网络微短剧、剧场化平台和虚拟现实项目四种样态的考察,提出当代数字视听文化在演进过程中体现... 详细信息

基于对当下代表性数字视听内容样态的分析,文章探讨数字视听文化迭进的规律,并立足于媒介文化的历史与社会角色展开反思。通过对网络综艺、网络微短剧、剧场化平台和虚拟现实项目四种样态的考察,提出当代数字视听文化在演进过程中体现出丰富多元的态势,呈现出结构化和展演性的新特征,并以智能化为未来向度。据此,可从五个方面展开对数字视听文化的速朽性的批判性反思。数字视听文化发展的基本矛盾是其艺术属性与媒介属性关于传播效能问题的分歧,应以对抗速朽为价值目标检视数字技术加诸文化的消极影响。通过回归马克思主义经典文化理论的方式,探索以坚持历史标准和公共旨趣的“活文化”来对抗速朽的可能路径。

关键词：数字媒体视听文化内容样态价值反思

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