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Graphene-wrapped multiloculated nickel ferrite:A highly efficient electromagnetic attenuation material for microwave absorbing and green shielding

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Nano Research 2022年第7期15卷 6751-6760页

作者： Yuchang Wang Lihua Yao qi zheng Mao-Sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China School of Mechatronical Engineering Shanxi Datong UniversityDatong 037003China

Dedicating to the exploration of efficient electromagnetic(EM)absorption and electromagnetic interference(EMI)shielding materials is the main strategy to solve the EM radiation *** development of multifunction EM attenuation materials that are compatible together EM absorption and EMI shielding properties is deserved our exploration and ***,the graphenewrapped multiloculated NiFe_(2)O_(4) composites are reported as multifunction EM absorbing and EMI shielding *** conductive networks configurated by the overlapping flexible graphene promote the riched polarization genes,as well as electron transmission paths,and thus optimize the dielectric constant of the ***,the introduction of magnetic NiFe_(2)O_(4) further establishes the magnetic-dielectric synergy *** abundant non-homogeneous interfaces not only generate effective interfacial polarization,also the deliberate multiloculated structure of NiFe_(2)O_(4) strengthens multi-scattering and multi-reflection sites to expand the transmission path of EM *** it turns out,the best impedance matching is matched at a lower filled concentration to achieve the strongest reflection loss value of−48.1 ***,green EMI shielding based on a predominantly EM absorption and dissipation is achieved by an enlargement of the filled concentration,which is helpful to reduce the secondary EM wave reflection pollution to the *** addition,the electrocatalytic properties are further *** graphene-wrapped multiloculated NiFe_(2)O_(4) shows the well electrocatalytic activity as electrocatalysts for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),which is mainly attributed to the interconnected structures formed by graphene and NiFe_(2)O_(4) *** structural advantages of multiloculated NiFe_(2)O_(4) expose more active sites,which plays an important role in optimizing catalytic *** work provides an excellent jumping-off point

关键词： electromagnetic absorbing green electromagnetic shielding multifunction electromagnetic attenuation material graphenewrapped multiloculated Fe_(2)O_(4) oxygen evolution reaction hydrogen evolution reaction

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Dynamically responsive photonic metal–organic frameworks

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Advanced Photonics 2023年第5期5卷 7-25页

作者： He-qi zheng Lin Zhang Yuanjing Cui Guodong qian Zhejiang University School of Materials Science and EngineeringCyrus Tang Center for Sensor Materials and ApplicationsState Key Laboratory of Silicon Materials and Advanced Semiconductor MaterialsHangzhouChina

Different from single and static photonic materials,dynamically responsive materials possess numerous advantages,such as being multifunctional,dynamically responsive,and able to provide multiple channels within spatially limited platforms,thus exhibiting great potential for application in the color-on-demand areas,including imaging,optical displays,anticounterfeiting,and *** functional metal–organic frameworks(MOFs),with highly designable framework structures and varieties of optical functional building units,possess broad research and application prospects in the field of photonics,which make it possible to design a promising platform with multifunctional and integrated photonic *** this review,beyond the preparation strategies of stimuli-responsive photonic MOFs,we also summarize the stimuli-responsive photonic MOFs regarding several most representative types of external stimuli(such as light,gas,pressure,and polarization).As shown,external stimulation endows the stimuli-responsive photonic MOFs with intriguing regulatable photonic properties:intensive and tunable emission,multiphoton-excitable luminescence,nonlinear optical,circularly polarized luminescence,lasing,***,their advanced representative applications,such as information encryption and anticounterfeiting display,biological imaging,chemosensing,and others,are also *** challenges are proposed and the prospects are addressed.

关键词： stimuli-responsive photonic properties switchable materials photochromic molecules metal-organic frameworks

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区域协同视野下高校引领大中小思政课一体化建设路径研究

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福建教育学院学报 2024年第4期25卷 75-78页

作者：谢彪郑其瑞林峰福建教育学院福建福州350025 福州屏东中学福建福州350003 福州市湖滨小学福建福州350025

以区域协同为视角,探讨高校如何在大中小思政课一体化建设过程中发挥引领作用。思政课一体化建设要取得实效,高校必须主动引领,建立区域内大中小学思政课协同机制,构建一体化教学机制;优化课程设置,推进一体化的教学衔接;增强师资队伍建... 详细信息

以区域协同为视角,探讨高校如何在大中小思政课一体化建设过程中发挥引领作用。思政课一体化建设要取得实效,高校必须主动引领,建立区域内大中小学思政课协同机制,构建一体化教学机制;优化课程设置,推进一体化的教学衔接;增强师资队伍建设,构建可持续发展的教师专业路径;完善多元评价体系,促进学生全面发展;建立以问题为导向、以实践为基础的教学教研,推动区域内的教学改革与创新。

关键词：区域协调大中小思政课一体化高校引领

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亚麻醉剂量艾司氯胺酮对髋关节置换术老年患者脑氧合的影响

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中国新药与临床杂志 2024年第6期43卷 446-449页

作者：王国立林全阳郑青麒马保新复旦大学附属中山医院厦门医院麻醉科福建厦门361006 厦门大学附属中山医院麻醉科福建厦门361000

目的探讨亚麻醉剂量艾司氯胺酮对髋关节置换术老年患者脑氧合及血流动力学的影响。方法选择择期行髋关节置换术患者60例,年龄≥65岁,ASA分级Ⅱ~Ⅲ级,随机分为2组,每组30例。2组麻醉诱导和维持方式基本相同,试验组在诱导时加用艾司氯胺酮... 详细信息

目的探讨亚麻醉剂量艾司氯胺酮对髋关节置换术老年患者脑氧合及血流动力学的影响。方法选择择期行髋关节置换术患者60例,年龄≥65岁,ASA分级Ⅱ~Ⅲ级,随机分为2组,每组30例。2组麻醉诱导和维持方式基本相同,试验组在诱导时加用艾司氯胺酮0.5 mg·kg^(-1)静脉注射,后以艾司氯胺酮0.25 mg·kg^(-1)·h^(-1)持续泵注,对照组在相应时点给予等量氯化钠注射液。记录入手术室时(T_(0))、诱导后3 min(T_(1))、插喉罩即刻(T_(2))、诱导后10 min(T_(3))、切皮时(T_(4))及手术1 h(T_(5))的平均动脉压(MAP)、心率(HR)、手术容积指数(SPI)和局部脑氧饱和度(rSO_(2)),观察术中用药情况、苏醒期恢复质量。结果与T_(0)比较,2组T_(1)~T_(5)各时点(除试验组T_(4))MAP、SPI均显著降低(P0.05)。试验组术中阿托品和麻黄碱使用率、丙泊酚和瑞芬太尼用量均显著低于对照组(P0.05)。结论亚麻醉剂量艾司氯胺酮对髋关节置换术老年患者的rSO_(2)无明显影响,可使患者血流动力学更稳定,有利于维持围术期脑组织的氧供需平衡。

关键词：艾司氯胺酮老年人关节成形术,置换,髋局部脑氧饱和度

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Scalp metastasis from gallbladder cancer： an unusual case

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Chinese Medical Journal 2014年第2期127卷 393-394页

作者： zheng qi Xu Yuqiao Nan Kejun Department of Oncology First Affiliated Hospital of Xi'an Jiaotong University Xi'an Shaanxi 710061 China Department of Pathology Xijing Hospital Fourth Military Medical University Xi'an Shaanxi 710032 China Affiliated Shaanxi Provincial Cancer Hospital College of Medicine Xi'an Jiaotong University Xi'an Shaanxi 710061 China

Gallbladder cancer is the most common malignant tumor of the biliary tract and the fifth most common malignancy of the gastrointestinal tract, In general, metastases of gallbladder carcinoma tends to occur in the regional lymph nodes and liver, while extra-abdominal and blood-borne metastases are relatively infrequent. Here we present an unusual case presenting with scalp metastasis from gallbladder cancer. To the best of our knowledge, only two similar cases have been documented in published literatures.

关键词： gallbladder cancer scalp metastasis

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考虑分布式光伏发电的单相接地故障下配电网的重构方法研究

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太阳能 2024年第6期 78-86页

作者：庾雅琪齐郑陈艳波华北电力大学电气与电子工程学院北京102206

针对考虑分布式光伏发电的单相接地故障下配电网的重构问题,通过分析单相接地故障下配电网重构的特殊性,建立了单相接地故障下配电网双层重构优化模型;然后采用双层粒子群优化算法将支路交换法与二进制粒子群优化算法相结合,通过启发式... 详细信息

针对考虑分布式光伏发电的单相接地故障下配电网的重构问题,通过分析单相接地故障下配电网重构的特殊性,建立了单相接地故障下配电网双层重构优化模型;然后采用双层粒子群优化算法将支路交换法与二进制粒子群优化算法相结合,通过启发式规则减少需要考虑的开关组合,快速确定配电网损耗最小且开关动作次数较少的配电网重构方案;最后通过IEEE14节点配电网算例,对本模型和策略进行了仿真验证。研究结果表明:所提出的方案是在考虑分布式光伏发电后,合理确定分布式光伏发电电源输出功率的同时,还可优化单相接地故障两个阶段的重构方案,减少了故障带来的损失。仿真结果验证了本方案的有效性和正确性。

关键词：光伏发电配电网单相接地故障配电网重构粒子群优化算法双层优化

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金融市场风险溢出对银行理财产品收益的效应研究

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财经理论研究 2024年第1期 12-25页

作者：龙林茂郑琦田亚军兰州财经大学统计学院甘肃兰州730020

随着《关于规范金融机构资产管理业务的指导意见》的正式实施,银行理财产品在债券市场与货币市场的投资比重增大,分析投资者所承担的金融市场风险溢出效应,有利于投资者对银行理财产品进行选择。本文运用溢出指数法测度债券市场与货币... 详细信息

随着《关于规范金融机构资产管理业务的指导意见》的正式实施,银行理财产品在债券市场与货币市场的投资比重增大,分析投资者所承担的金融市场风险溢出效应,有利于投资者对银行理财产品进行选择。本文运用溢出指数法测度债券市场与货币市场风险溢出对银行理财产品收益率的效应或者风险贡献,并运用GARCH模型检验溢出指数法测度的有效性,继而就《关于规范金融机构资产管理业务的指导意见》实施前后的影响进行对比分析。研究表明:债券市场对银行理财产品投资收益有相对较大的风险溢出效应,货币市场的风险溢出效应相对较小,且债券市场变化对银行理财产品投资收益的影响存在滞后效应。《关于规范金融机构资产管理业务的指导意见》实施前后,债券市场、货币市场对银行理财产品投资收益的风险溢出效应呈现前高后低。《关于规范金融机构资产管理业务的指导意见》实施后,债券市场和货币市场对银行理财产品收益的风险溢出效应并没有因投资比重增加而显著增强。未来,银行理财产品投资者承担的风险主要来源于银行的投资管理。银行需要在债券市场进一步加强投资管理,以降低银行理财产品投资者的风险。

关键词：金融市场风险溢出资管新规银行理财产品收益

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Vertical temperature gradients of concrete box girder caused by solar radiation in Sichuan-Tibet railway

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第5期23卷 375-387页

作者： Tao SHI Xing-wang SHENG Wei-qi zheng Ping LOU School of Civil Engineering Central South UniversityChangsha 410075China National Engineering Research Center of High-Speed Railway Construction Technology Changsha 410075China MOE Key Laboratory of Engineering Structures of Heavy Haul Railway Central South UniversityChangsha 410075China

Spatial and temporal temperature variations are critical for concrete box girders,and non-uniform temperature distributions induced by solar radiation depend on the structural shapes and shadows cast on *** have been many studies of temperature distributions and temperature gradients of concrete box girders,but few have considered a high altitude plateau climatic *** this study,the nonlinear temperature distributions of concrete box girders in the Sichuan-Tibet railway caused by solar radiation were investigated based on experimental analysis,real-time shadow-selection algorithm,and finite element ***,a vertical temperature gradient model of the concrete box girders was *** vertical temperature gradient values first rise,then decrease,and finally rise again from Chengdu to Lhasa,with samples forming a normal *** recommended vertical temperature gradient value was 25℃with a confidence interval of 95%.This provides a reference for the design and maintenance of concrete box girders on the Sichuan-Tibet railway.

关键词： Concrete box girder Solar radiation Temperature gradient Sichuan-Tibet railway Probability statistics

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Selective leaching of vanadium from V-Ti magnetite concentrates by pellet calcification roasting-H_(2)SO_(4) leaching process

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International Journal of Mining Science and Technology 2021年第3期31卷 507-513页

作者： Yi Luo Xiaokui Che Xinglan Cui qi zheng Lei Wang National Engineering Laboratory of Biohydrometallurgy GRINM Group Corp.Ltd.Beijing 101407China GRINM Resources and Environment Tech.Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China

A novel method of pellet calcification roasting-H_(2)SO_(4) leaching was proposed to efficiently separate and extract vanadium(V)from vanadium-titanium(V-Ti)magnetite *** leaching rate of V is as high as 88.98%,while the leaching rate of impurity iron is only 1.79%.Moreover,the leached pellets can be used as raw materials for blast furnace ironmaking after secondary roasting.X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy with energy dispersive X-ray spectrometry(SEMEDS)analyses showed that V^(3+)was oxidized to V^(5+)after roasting at 1200℃,and V^(5+)was then leached by H_(2)SO_(4).X-ray diffraction(XRD)analyses and single factor experiment revealed a minimal amount of dissolved Fe_(2)O_(3) during H_(2)SO_(4) ***,a high separation degree of V and iron(Fe)from V-Ti magnetite concentrate was achieved through H_(2)SO_(4) *** with the traditional roastingleaching process,this process can achieve a high selectivity of V and Fe,and has excellent prospects for industrial production.

关键词： Selective leaching Vanadium V-Ti magnetite concentrate Pellets Sulfuric acid

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Porous N-doped Ni@SiO_(2)/graphene network: Three-dimensional hierarchical architecture for strong and broad electromagnetic wave absorption

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Journal of Materials Science & Technology 2022年第11期106卷 108-117页

作者： Rui Guo qi zheng Lianjun Wang Yuchi Fan Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationDonghua UniversityShanghai 201620China

Electromagnetic wave absorber is critical for reducing increasingly serious electromagnetic wave pollu-tion,however,the development of lightweight and broadband microwave absorbers remains a pressing *** report here the rational design and synthesis of N-doped Ni@SiO_(2)/graphene composite con-structed from 3D interconnected porous graphene network and Ni@SiO_(2) core-shell architecture,which fulfills lightweight and broadband requirements while exhibiting highly efficient electromagnetic wave *** porous graphene network,functioning both as lightweight support and dielectric medi-ator,was synthesized via NaCl template-assisted high-temperature calcination *** uniformly attached with core-shell Ni@SiO_(2) on the surface,the resulting abundant heterogeneous interfaces con-structed by graphene-Ni and Ni-SiO_(2) strongly reinforce polarization *** presence of low dielectric SiO_(2) allows facile tuning of the complex permittivity of ternary composite by adjusting coating thick-ness to balance the attenuation ability and impedance ***,further N-doping of graphene assists in the optimization of dielectric loss *** account of the advantages arising from the porous hierarchical architecture,multiple absorption centers and diverse interfaces,the lightweight com-posite exhibits an ultra-strong reflection loss(RL)value of-71.13 dB at 13.76 GHz with a thickness of 2.46 mm and broad effective absorption bandwidth of 7.04 GHz at a low filler content of 15 wt.%.More importantly,the effective absorption range covers 13.28 GHz(4.72-18 GHz)with the optimized thickness of 1.6-5 mm,representing 83%of the whole range of *** results demonstrate that the novel 3D porous N-doped Ni@SiO_(2)/graphene network with hierarchical architecture is a promising candidate for high-performance electromagnetic wave absorption.

关键词： 3D porous graphene network Ni@SiO_(2)core-shell structure N-doped graphene Hierarchical architecture Electromagnetic wave absorption

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