不同回火温度下C60模具钢硬度的涡流测试方法

研究了不同回火温度对C60模具钢的显微组织、电磁特性和硬度等的影响。结果表明:随着回火温度的升高,C60模具钢的晶体结构产生相变,内部磁矩方向发生变化,导致材料的电磁特性参数发生改变,组织中铁素体含量增多,使材料的硬度变小;对比不同回火温度下C60模具钢硬度与阻抗之间的关系,建立了测试C60模具钢硬度的电磁数学模型,且电磁检测结果与实际测试结果的相对误差小于1%,表明涡流电磁信号能够准确测试C60模具钢的硬度。

Study on Chaotic Characteristics of the Friction Process between High Hardness Alloy Steel and Cemented Carbide under C60 Nanoparticle Fluid Lubrication

Friction and wear phenomenon is a complex nonlinear system,and it is also a significant problem in the process of metal cutting.In order to systematically analyze the friction and wear process of tool material-workpiece material friction pair in the cutting process of high hardness alloy steel under different lubrication conditions,the chaotic characteristics of friction process between high hardness alloy steel and cemented carbide under the lubrication C60 nano-particles fluid are studied based on the chaos theory.Firstly,the friction and wear experiments of the friction pair between high hardness alloy steel and cemented carbide tool are carried out based on the ring-block friction and wear tester,and the results of friction force signal in time domain and wear width are obtained.Then,the friction signals in time domain are processed and transformed based on phase space reconstruction and recurrence plot theory,and the recurrence plots of different experimental groups under different lubrication conditions are generated.The evolution law of recurrence plot is further observed and studied,and the recursive quantitative index is analyzed.Finally,the cutting experiments of tool wear are carried out.The results show that the proposed method can intuitively and accurately reveal the wear evolution process and the wear feature identification law of the tool material-high hardness alloy steel pair under different lubrication conditions.Meanwhile,it is found that when the concentration of C60 nanoparticles is 200∼300 ppm,the stability of the friction pair system is best.The proposed method can provide a strategy for wear prediction in cutting process,and provide a theoretical basis and technical support for antifriction lubrication methods in practical cutting applications.

CRTSⅢ型轨道板C60混凝土工艺研究

CRTSⅢ型板式无砟轨道先张法预应力混凝土轨道板,是具有我国完全自主知识产权的高速铁路技术,也是目前最先进的高速铁路无砟轨道。轨道板采用C60高性能混凝土浇筑,提高轨道板使用的强度和耐久性,轨道板要求工厂化生产。为了提高轨道板生产质量和工厂化生产的要求,结合轨道板生产过程经验,研究了轨道板C60混凝土制备和浇筑工艺。主要包括,混凝土原材料、混凝土配合比设计计算、混凝土配比确定、混凝土拌和、混凝土浇筑、混凝土养护。

基于多元固废制备超细矿物掺合料及在C60混凝土中的性能研究

文中利用水淬锰渣、矿粉、粉煤灰,结合水泥助磨剂活化作用,采用正交试验方法,在水淬锰渣、矿粉、粉煤灰质量比为5∶3∶2,水泥助磨剂掺量为0.1%,机械混合球磨90 min的条件下,制得比表面积达786 m^(2)/kg、7 d活性指数80.3%、28 d活性指数96.4%的超细矿物掺合料。同时,超细矿物掺合料在C60混凝土中水泥取代率可达21%,矿粉的使用率可降低至少50%。

C60混凝土配合比方法在隧道工程中的应用

高性能混凝土因其良好的综合性能被广泛用于对使用性能要求严格的建筑领域。根据隧道工程实际应用的需求,通过原料甄选、混凝土配合比设计、试验验证等手段研究了一种适用于隧道工程实际应用的C60高性能混凝土材料。实验结果证明,采用478kg水泥、58kg矿渣粉、9kg硅灰、5.7kg外加剂、662kg砂、1104kg石子、158kg水这一比例混合而成的混凝土材料,28d强度达到90MPa以上,完全满足隧道工程强度需要。

初中化学发展学生模型认知能力的教学探索——以“金刚石、石墨和C60”第一课时为例

模型认知是指利用模型认识事物或通过构建模型解决问题的一种思维方法。模型认知是化学学习和化学教学必不可少的方法,培养学生的模型认知能力已经成为化学课程改革的重要内容之一。初中化学物质的认识模型构建能提高学生分析问题、解决问题的能力,帮助学生形成有序的化学知识体系。初中化学教师可通过丰富的探究活动增强学生的学习体验与感知,以改进教具、数形结合的方式突破微观结构重难点,使用地方特色情境素材体现学科知识与社会生活的联系,使学生在内化和外显物质认识模型的过程中发展化学核心素养。

C60 Fullerenes Suppress Reactive Oxygen Species Toxicity Damage in Boar Sperm

We report the carboxylated C60 improved the survival and quality of boar sperm during liquid storage at 4°C and thus propose the use of carboxylated C60 as a novel antioxidant semen extender supplement.Our results demonstrated that the sperm treated with 2μg mL?1 carboxylated C60 had higher motility than the control group(58.6%and 35.4%,respectively;P?0.05).Moreover,after incubation with carboxylated C60 for 10 days,acrosome integrity and mitochondrial activity of sperm increased by 18.1%and 34%,respectively,compared with that in the control group.Similarly,the antioxidation abilities and adenosine triphosphate levels in boar sperm treated with carboxylated C60 significantly increased(P?0.05)compared with those in the control group.The presence of carboxylated C60 in semen extender increases sperm motility probably by suppressing reactive oxygen species(ROS)toxicity damage.Interestingly,carboxylated C60 could protect boar sperm from oxidative stress and energy deficiency by inhibiting the ROS-induced protein dephosphorylation via the cAMP-PKA signaling pathway.In addition,the safety of carboxylated C60 as an alternative antioxidant was also comprehensively evaluated by assessing the mean litter size and number of live offspring in the carboxylated C60 treatment group.Our findings confirm carboxylated C60 as a novel antioxidant agent and suggest its use as a semen extender supplement for assisted reproductive technology in domestic animals.

基于 Fe_(3)O_(4)@SiO_(2)@NH_(2)@C60的磁固相萃取/气相色谱-质谱联用检测中药材中多环芳烃

基于 Fe_(3)O_(4)@SiO_(2)@NH_(2)@C60磁纳米复合材料,建立了磁固相萃取/气相色谱-质谱联用同时测定中药材中16种多环芳烃(PAHs)含量的分析方法。采用傅里叶变换红外光谱仪、扫描电镜和振动样品磁力计对复合材料进行表征,证实C60改性成功;吸附性能实验结果表明, Fe_(3)O_(4)@SiO_(2)@NH_(2)@C60的吸附能力强,稳定性好,经10次重复利用后吸附效率无明显变化。考察了萃取溶剂种类、吸附剂用量、吸附时间、解吸溶剂种类以及解吸时间对中药材样品中16种PAHs萃取效率的影响。结果显示,10 mg吸附剂在4 min内即可实现对目标物的完全吸附。采用最优的磁固相萃取条件,16种PAHs在5~1 000μg/L范围内具有良好的线性关系,相关系数(r^(2))为0.994 0~0.999 9,检出限为0.2~1.2μg/kg,定量下限为0.8~3.9μg/kg,3个水平下的加标回收率为84.1%~104%,相对标准偏差(RSD)为0.70%~8.3%,日内RSD为0.20%~3.5%,日间RSD为2.2%~6.9%。所建立的方法能有效降低中药材样品中复杂基质的干扰,为中药材中PAHs含量的测定提供了一种操作简便、灵敏度高、准确性好的方法参考。

C60低收缩低徐变高性能混凝土收缩徐变行为试验研究

为探究C60低收缩低徐变高性能混凝土不同加载龄期和应力水平下的收缩徐变机理,开展了常规环境下不同加载龄期和应力水平的C60低收缩低徐变高性能混凝土收缩徐变试验研究,对实测结果与常用规范模型结果进行对比分析。结果表明:在常规环境下,C60低收缩低徐变高性能混凝土加载龄期为7、24 d持荷270 d的线性徐变系数分别为0.80和0.38左右,是C60普通混凝土的0.4~0.6倍;收缩应变和徐变系数实测值相比GL2000、ACI-209、JTG 3362—2018和AASHTO规范模型计算值均偏小,偏差达40%。根据实测试验结果,在线性徐变范围内,引入收缩修正系数对JTG 3362—2018模型进行修正,分别建立常规环境下C60低收缩低徐变高性能混凝土收缩应变和线性徐变系数预测模型,计算结果与试验结果误差较小,可为指导实际工程的应用提供依据。

Spectral Investigations of Hybrid Nanostructures Including Modified Fullerene C60 and Carbazole-Derivative Fluorophore

Hybrid nanostructures including modified fullerene C60 and fluorophoric (E)-2-Cyano-3-(9-ethyl-9Н-carbazole-3-yl)-acrylic acid (cyanoacrylic acid I) were created. Spectral properties (absorption and luminescence spectra) of the hybrid nanostructures were investigated. It was established what molecules C60 strongly affected spectral properties of cyanoacrylic acid I in the hybrid nanostructures. Luminescence quenching of fluorophore and a change of luminescence features were observed in the hybrid nanostructures.

A COMPARATIVE STUDY ON THE PHOTOVOLTAIC PROPERTIES OF BUCKMINSTERFULLERENE （C60） AND ITS ANION SALT

Measurements of Surface Photovoltage Spectroscopy(SPS)Were carried out for C60(A)and its anion salt(B)for the first time.With a reference of UV-vis spectra,the results for SPS are discussed in terms of Molecular Orbit(MO) and Surface Photovoltage(SPV)theory. By a comperison between(A)and(B)'s characteristic responses is SPS,a deeper insisht into the nature of their photovoltaic properties is obtained.

Fullerene(C60) as a Potential Chemical Sensor for Hydrogen Cyanide Detection

To find a novel sensor for the detection and control of toxic hydrogen cyanide(HCN), the geometrical and electronic parameters of HCN adsorption on fullerene C60 were investigated using density functional theory(DFT) calculations by means of B3 LYP functional with 6-31 G* basis set. The calculated density of states(DOSs) shows that the electronic properties of fullerene C60 were very sensitive to the presence of HCN molecule, so that the Eg of C60 was significantly decreased from 2.76 eV in pristine form to 1.81 eV(34.4% change) after the HCN adsorption which would result in electrical conductance increment. The results demonstrated that the C60 may convert the presence of a HCN molecule to an electrical signal for using in HCN-sensor devices through doping, chemical functionalization. Also, based on calculated results, the C60 is expected to be a potential efficient adsorbent as well as a sensor for detecting the presence of toxic HCN.

C60高强混凝土配比设计优化及质量控制措施分析

为有效提升C60混凝土工作性能及施工质量,依托某小区配套学校项目施工实践,针对C60高强混凝土配合比设计优化及质量控制展开综合探究,结合原材料及配合比试验,确定工程应用理论配合比,分别从水胶比、砂率、粉煤灰级别3个方面分析对混凝土强度及拌合物性能的影响,并提出了混凝土生产、浇筑、养护等各环节施工质量控制措施,具有重要的参考价值。

C60自密实混凝土在潮州大桥工程的应用研究

围绕创建国家优质工程质量目标,根据主要受力构件全部采用混凝土现浇施工的技术要求,针对型钢混凝土配筋(钢)密集且结构复杂、混凝土泵送及振捣施工难度较大、混凝土性能和质量要求高等技术难题,通过优选原材料,精研混凝土配合比方案,优化施工技术措施,有效解决本工程高强度、高性能混凝土现浇施工关键性技术难题,实现工程质量达到国家优良水平。

微珠对高石粉含量机制砂C60混凝土性能的影响

研究了微珠掺量(0、4%、8%、12%、16%)对高石粉含量机制砂C60混凝土的工作性、力学性能和耐久性能的影响。结果表明:掺入适量的微珠能改善高石粉含量机制砂C60混凝土拌合物的流动性,降低1 h坍落度损失和倒筒排空时间,提高力学和耐久性能;当微珠掺量为8%~12%时,高石粉含量机制砂C60混凝土的综合性能最佳。

C60高强混凝土的配制及工程应用

近年来,随着我国高层建筑的发展,高强混凝土的应用越来越广泛,其中高强混凝土又称为高性能混凝土,它是以高强度等级作为主要特征的一种新型的水泥混凝土材料。随着高层建筑的不断增多和结构形式的不断复杂,对混凝土的性能要求也越来越高。因此,高性能混凝土被认为是未来混凝土发展的主要方向和趋势。高强混凝土对原材料品质要求较高,要求原材料具有良好的和易性、流动性、保水性、可泵性和高强度等性能。在配制高强混凝土时,不仅要保证其良好的工作性能和强度性能,还要满足耐久性要求。本文首先分析了高强混凝土的性能要求,并研究了C60高强混凝土的配制,结合某工程实例对其在工程中的应用进行了介绍,最后指出了C60高强混凝土的配制方法。

机制砂掺量对C60高性能混凝土的性能影响研究

C60高性能混凝土具有高强度、耐久性和抗裂性能等优点,在工程实践中得到了广泛应用。为进一步提高C60混凝土的性能,文章旨在通过对机制砂在C60高性能混凝土中的应用研究进行系统研究,探索机制砂在C60混凝土中的性能影响应用,以期为混凝土工程实际应用提供理论支持和指导。

基于STC12C5A60S2单片机显示模块的实验研究

以常用的STC12C5A60S2单片机为主控芯片,以实验室单片机平台为载体,分别对数码管、LCD1602、LCD12864、OLED以及TFT五种显示屏进行DS18B20温度传感器采集与显示实验。实验测试结果表明五种显示模块均能有效采集并显示当前温度值,对比分析各种显示模块的性能,为不同应用场景下的显示需求提供了参考和借鉴,具有重要的实际应用价值。