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基于双通道的全电子相敏接收器研究与设计

集成电路与嵌入式系统 2025年第1期25卷 67-73页

作者：刁艳美陈美玲易靓南京工业大学浦江学院机电学院南京210000 江西工业工程职业技术学院机械工程学院萍乡337000

为提高相敏接收器测量精度、分辨率,设计了一款基于全相位快速傅里叶变换(all phase Fast Fourier Transform,apFFT)算法的全电子相敏接收器。硬件上为二取二双通道设计,进程上双机同步,运算结果经比较输出。利用DDS发生器搭建测试平台... 详细信息

为提高相敏接收器测量精度、分辨率,设计了一款基于全相位快速傅里叶变换(all phase Fast Fourier Transform,apFFT)算法的全电子相敏接收器。硬件上为二取二双通道设计,进程上双机同步,运算结果经比较输出。利用DDS发生器搭建测试平台,对该方案功能进行模拟验证,并接入现场轨道电路组合架进行现场测试。实验结果表明,该设计可准确检测轨道区段列车占用状态,能区分钢轨上的随机噪音与谐波信号,抗干扰能力强,相位差测量误差不大于0.3°。该方案是对既有的微电子相敏轨道电路接收器的电子化改进,电路简单,其相位差计算完全由软件完成,可靠性高,可用于使用50 Hz交流电牵引的25 Hz相敏轨道电路的电码化或非电码化区段。

关键词：二取二双通道 apFFT 25 Hz相敏轨道电路相位差

白鹤滩水电站夹墙风管流动特性的模型试验研究（一）

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制冷与空调（四川） 2019年第5期33卷 471-477页

作者：梁艳梅郭敏肖益民徐蒯东盘晓红重庆大学城市建设与环境工程学院重庆400030 中国电建集团华东勘测设计研究院有限公司杭州311100

为满足地下水电站厂房的通风组织要求,需在厂房墙体和硐室岩体壁面之间的夹墙空间设置大量风管。为使风管安装适应岩壁锚索,提出了风管在锚索对应位置“穿孔”的解决方案。建立几何比例为1:2的夹墙风管通风流动相似试验模型,研究“穿孔... 详细信息

为满足地下水电站厂房的通风组织要求,需在厂房墙体和硐室岩体壁面之间的夹墙空间设置大量风管。为使风管安装适应岩壁锚索,提出了风管在锚索对应位置“穿孔”的解决方案。建立几何比例为1:2的夹墙风管通风流动相似试验模型,研究“穿孔”对夹墙风管通风道影响,通过试验证明了方案的可行性,并对比了风机的不同安装位置对系统风量的影响,结果表明,不同安装位置下的系统风量无明显差异。该结论可为类似工程建设提供理论支撑和设计参考。

关键词：水电站地下厂房夹墙风管岩壁锚索相似模型试验

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新生儿疾病筛查采血方法与采血针改良的探讨

护理研究 2008年第5期22卷 432-433页

作者：刘仲寅梁燕梅郑杏珊广东省中山市博爱医院

[目的]探讨新生儿疾病筛查中不同采血方法和采血针采集血标本的效果。[方法]实验组834例新生儿,选择足跟内侧的足底内静脉及足跟外侧的小隐静脉分支处,选用改良后的笔式采血针采集血标本;对照组813例新生儿,选择足跟两侧随意部位,选用... 详细信息

[目的]探讨新生儿疾病筛查中不同采血方法和采血针采集血标本的效果。[方法]实验组834例新生儿,选择足跟内侧的足底内静脉及足跟外侧的小隐静脉分支处,选用改良后的笔式采血针采集血标本;对照组813例新生儿,选择足跟两侧随意部位,选用一次性采血针采集血标本。[结果]两组采血一次成功率和标本合格率比较,差异有统计学意义(P<0.05)。[结论]改良后的采血方法和采血针,能提高采血成功率和标本合格率。

关键词：新生儿疾病筛查采血方法采血针

Catalyst–Support Interaction in Polyaniline‑Supported Ni_(3)Fe Oxide to Boost Oxygen Evolution Activities for Rechargeable Zn‑Air Batteries

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Nano-Micro Letters 2025年第1期17卷 176-190页

作者： Xiaohong Zou Qian Lu Mingcong Tang Jie Wu Kouer Zhang Wenzhi Li Yunxia Hu Xiaomin Xu Xiao Zhang Zongping Shao liang An Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARPeople’s Republic of China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and TechnologyNanjing University of Information Science and TechnologyNanjing 210044People’s Republic of China Department of Chemistry The Chinese University of Hong KongMa Lin BuildingShatinHong Kong SAR 999077People’s Republic of China WA School of Mines:Minerals Energy and Chemical Engineering(WASM‑MECE)Curtin UniversityPerthWA 6102Australia Research Institute for Advanced Manufacturing The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARPeople’s Republic of China Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARPeople’s Republic of China

Catalyst–support interaction plays a crucial role in improving the catalytic activity of oxygen evolution reaction(OER).Here we modulate the catalyst–support interaction in polyaniline-supported Ni_(3)Fe oxide(Ni_(3)Fe oxide/PANI)with a robust hetero-interface,which significantly improves oxygen evolution activities with an overpotential of 270 mV at 10 mA cm^(-2)and specific activity of 2.08 mA cm_(ECSA)^(-2)at overpotential of 300 mV,3.84-fold that of Ni_(3)Fe *** is revealed that the catalyst–support interaction between Ni_(3)Fe oxide and PANI support enhances the Ni–O covalency via the interfacial Ni–N bond,thus promoting the charge and mass transfer on Ni_(3)Fe *** the excellent activity and stability,rechargeable Zn-air batteries with optimum Ni_(3)Fe oxide/PANI are assembled,delivering a low charge voltage of 1.95 V to cycle for 400 h at 10 mA cm^(-2).The regulation of the effect of catalyst–support interaction on catalytic activity provides new possibilities for the future design of highly efficient OER catalysts.

关键词： Catalyst-support interaction Supported catalysts Heterointerface Oxygen evolution reaction Zn-air batteries

脑出血患者术后无肝素CRRT治疗的护理干预

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岭南现代临床外科 2015年第3期15卷 364-366页

作者：陈玉叶吕群玉曾顾梅梁艳梅新兴县人民医院ICU 广东云浮527400

目的讨论脑出血患者术后行无肝素化连续性肾脏替代治疗(CRRT)的有效护理措施和护理效果观察。方法选择2012年1月至2014年1月30例患者作为A组,采用预冲管路肝素液的浸泡时间增加到45 min,治疗期间采取改良的盐水冲管方法。选2010年1月至2... 详细信息

目的讨论脑出血患者术后行无肝素化连续性肾脏替代治疗(CRRT)的有效护理措施和护理效果观察。方法选择2012年1月至2014年1月30例患者作为A组,采用预冲管路肝素液的浸泡时间增加到45 min,治疗期间采取改良的盐水冲管方法。选2010年1月至2011年12月28例患者作为B组,采用无肝素化CRRT临床常规护理措施。对比两组滤器寿命和患者的凝血功能、血小板变化。结果 A组在滤器使用时间、滤器堵塞被动下机方面优于B组,差异有统计学意义(P<0.05)。两组间凝血功能和血小板计数的差异没有统计学意义。两组例患者均无再出血并发症。结论脑出血患者术后行无肝素CRRT治疗,增加预冲管路肝素液的浸泡时间和采取改良的盐水冲管方法,有利于延长滤器使用寿命。

关键词：无肝素化连续性肾脏替代治疗护理脑出血

Preparation of Co/S co-doped carbon catalysts for excellent methylene blue degradation

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 169-181页

作者： Haixu Li Haobo He Tiannan Jiang Yunfei Du Zhichen Wu liang Xu Xinjie Wang Xiaoguang Liu Wanhua Yu Wendong Xue School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Jinyu Tongda Refractory Technologies Co. Ltd.Beijing 100085China

S and Co co-doped carbon catalysts were prepared via pyrolysis of MOF-71 and thiourea mixtures at 800℃at a mass ratio of MOF-71 to thiourea of 1:0.1 to effectively activate peroxymonosulfate(PMS)for methylene blue(MB)*** effects of two different mixing routes were identified on the MB degradation ***,the catalyst obtained by the alcohol solvent evaporation(MOF-AEP)mixing route could degrade 95.60%MB(50 mg/L)within 4 min(degradation rate:K=0.78 min^(-1)),which was faster than that derived from the direct grinding method(MOF-DGP,80.97%,K=0.39 min^(-1)).X-ray photoelectron spectroscopy revealed that the Co-S content of MOF-AEP(43.39at%)was less than that of MOF-DGP(54.73at%),and the proportion of C-S-C in MOF-AEP(13.56at%)was higher than that of MOF-DGP(10.67at%).Density functional theory calculations revealed that the adsorption energy of Co for PMS was -2.94 eV when sulfur was doped as C-S-C on the carbon skeleton,which was higher than that when sulfur was doped next to cobalt in the form of Co-S bond(-2.86 eV).Thus,the C-S-C sites might provide more contributions to activate PMS compared with ***,the degradation parameters,including pH and MOF-AEP dosage,were ***,radical quenching experiments and electron paramagnetic resonance(EPR)measurements revealed that ^(1)O_(2)might be the primary catalytic species,whereas·O~(2-)might be the secondary one in degrading MB.

关键词： advanced oxidation process alcohol solvent evaporation hydrogen bond S and Co co-doped carbon catalysts wastewater remediation

超声诊断配合针灸治疗下肢动脉闭塞性病变临床观察

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湖北中医药大学学报 2014年第3期16卷 101-103页

作者：王淑艳梁艳梅孙杰张彦斐河北省邯郸市中医院功能科河北邯郸056000

目的观察超声诊断配合中医针灸治疗下肢动脉闭塞性疾病的临床疗效。方法下肢动脉硬化闭塞患者124例,随机分为两组。对照组给予西洛他唑100mg治疗,餐后口服。治疗组先行彩色多普勒超声仪诊断,频率10MHz,壁滤波50Hz,取样容量5mm,声束与血... 详细信息

目的观察超声诊断配合中医针灸治疗下肢动脉闭塞性疾病的临床疗效。方法下肢动脉硬化闭塞患者124例,随机分为两组。对照组给予西洛他唑100mg治疗,餐后口服。治疗组先行彩色多普勒超声仪诊断,频率10MHz,壁滤波50Hz,取样容量5mm,声束与血流夹角<60°。之后选双侧承山穴和足三里穴,以毫针刺,进针3cm。采用"平补平泻"针法,两穴连电针留针30min,每日1次,每周5次。4周为1个疗程。结果治疗组总有效率显著高于对照组(P<0.05)。治疗后,治疗组患者踝肱指数显著高于对照组(P<0.05)。结论彩色多普勒超声可准确提供血管疾病的解剖及功能信息,是下肢动脉闭塞性疾病无创检查的有效方法;中医针灸治疗下肢动脉闭塞性疾病疗效确切,无副作用,值得临床推广应用。

关键词：下肢动脉闭塞西医疗法针灸疗法彩色多普勒超声诊断针灸

Digitalization of mechanical and physical properties of Singapore Bukit Timah granite rocks based on borehole data from four sites

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Underground Space 2021年第5期6卷 483-491页

作者： Zhang Wengang Han liang Zong Zixu Zhang yanmei Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China College of Aerospace Engineering Chongqing UniversityChongqing 400044China School of Civil Engineering Chongqing UniversityChongqing 400045China

The Bukit Timah Granite(BTG)formation is widely distributed in the central and northern parts of Singapore *** BTG rocks in the formation vary from granite to *** hybrid rocks and dykes are also present in the *** granite is in various states of fracturing and weathering,ranging from residual soils to intact,unweathered fresh *** paper presents some mechanical and physical properties of Singapore BTG rocks,based on data from the Factual Geotechnical Reports of more than 200 boreholes from Downtown Line stage II(DTL2)sites of Cashew,Hillview,Bukit Panjang and Beauty *** variations of the parameters,including the unconfined compressive strength(UCS),the point-load strength index(I_(s50)),the Cerchar abrasivity index(CAI),and the slake-durability index are derived from laboratory tests on samples from borelogs of different *** empirical correlations between the UCS and I_(s50) and between the CAI and the strength parameters(UCS and I_(s50))are derived and validated against the commonly adopted *** information,including the average values,the standard deviations,and the coefficients of variation,are provided for these *** statistics provide a useful reference for numerical simulations and future projects involving BTG rocks.

关键词： BTG rocks Unconfined compressive strength Point-load strength index Digitalization Abrasivity Slake-durability

Buried interface bridging for inverted cesium-formamidinium triiodide perovskite solar cells with long operational stability

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Science China Chemistry 2025年第1期68卷 163-173页

作者： Chenhui Zhang Chunjun liang Fulin Sun Ting Zhu Xinghai Huang Yuzhu Guo Xinyu Guo Kunyang Ge Dan Li Fangtian You Zhiqun He Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong University Department of Physics School of Physical Science and Engineering Beijing Jiaotong University

In the field of perovskite solar cells(PSCs), the research on defects in the buried interface has been relatively limited due to its non-exposure; however, this interface significantly impacts the performance enhancement of inverted PSCs. This study employs phenylethylammonium chloride(PEACl) molecules as a buffer layer to modify the buried interface of p-i-n structured PSCs,aiming to enhance the uniformity of self-assembled monolayers(SAMs) and facilitate the uniform nucleation and growth of perovskite films on the substrate. Furthermore, the introduction of the PEACl buffer layer effectively passivates defects at the bottom of the perovskite layer and notably enhances the crystal quality of the perovskite film by mitigating residual stress,thereby reducing nonradiative recombination loss. Following these optimizations, the MA-free PSCs treated with PEACl achieve a power conversion efficiency(PCE) of 24.11%, with significant improvements in storage, thermal stability, and operational stability. Particularly noteworthy is the device's performance in an unencapsulated state, whereas after 1,500 hours of continuous light operation stability testing, it retains 97% of its original efficiency. This study not only enriches the systematic understanding of the characteristics of the buried interface in PSCs but also contributes significantly to advancing the commercial production of perovskite photovoltaic technology.

关键词： defect-induced recombination buried interfaces inverted perovskite solar cells crystallization lattice mismatch