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An experimental study on shift in natural frequency of sandwich beam with elastomeric core embedded with SMA wires SMA钢丝夹层梁固有频率位移的实验研究
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609383
D. J. More, S. B. Kumbhar
In this paper an experimental study of dynamic behavior of sandwich beam with elastomeric core embedded with shape memory alloy (SMA) wires is done. The three pre-strained Ni 50%, Ti 50% wires with 10 mm offset from neutral axis are used. The wires are embedded along the length of rectangular beam and elastomeric core is sandwiched between two copper plates. The beam is tested for free-free boundary condition and average 48% shift in natural frequency is observed when the stiffness of beam is changed by heating the wire by 4.5 amp electric current. The effect of actuation current on damping factor and time required to regain its original frequency, after making current zero, is estimated and presented.
本文对形状记忆合金(SMA)钢丝嵌入弹性芯的夹层梁的动力特性进行了实验研究。使用三根预应变Ni 50%, Ti 50%导线,与中性轴偏移10mm。导线沿矩形梁的长度嵌入,弹性体芯夹在两块铜板之间。在自由-自由边界条件下对梁进行了测试,当用4.5安培的电流加热导线改变梁的刚度时,其固有频率平均变化48%。估计并给出了驱动电流对阻尼系数和使电流为零后恢复到原频率所需时间的影响。
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引用次数: 2
Processing of cellular materials — An overview 细胞材料的加工-概述
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609371
V. K. Bupesh Raja, S. Prabhu
The cellular materials have myriad of applications due to their unique properties viz., high stiffness-to-weight ratio, lower density, good thermal insulation, excellent sound and energy absorption capability and good vibration damping. Cellular materials are foams generally made of materials like Polyurethane, Ceramics, Aluminium, Steel, Nickel, Titanium, etc,. These cellular materials are used in structural applications in civil construction industries, process industries, aircraft and automobile industries; and in non-structural applications like thermal insulation, acoustic absorption, vehicle crash energy absorption, filters and so on. In this paper, the manufacturing processes used to fabricate the cellular materials are discussed.
蜂窝材料由于其独特的性能,即高刚度重量比,低密度,良好的隔热性能,良好的吸声和吸能能力和良好的减振性能,有无数的应用。蜂窝材料是泡沫材料,一般由聚氨酯、陶瓷、铝、钢、镍、钛等材料制成。这些蜂窝材料用于民用建筑工业、加工工业、飞机和汽车工业的结构应用;在非结构应用中,如隔热、吸声、汽车碰撞能量吸收、过滤器等。本文讨论了用于制造蜂窝材料的制造工艺。
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引用次数: 3
Dielectric investigation on newly synthesized H-shaped dimer 新合成的h型二聚体的介电性能研究
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609297
Sudhaker Dixit, R. Manohar, A. Prajapati, M. Varia
The present study reports dielectric study of newly synthesized unusual H shaped mesogenic dimer. We have performed dielectric study with temperature variation in the frequency range 100 Hz to 40 MHz. The present study is important due to unusual shape of these liquid crystal dimer. The dielectric results suggest that relaxation mode has been observed in MHz region for the sample . For the sample relaxation mode follows Cole-Cole theory. Relaxation frequency and relaxation strength have been evaluated from Cole-Cole plot. In addition to this, activation energy has also been calculated from Arrhenius plot showing higher value than other conventional liquid crystal material.
本文报道了新合成的异H型介生二聚体的介电性质。我们在100 Hz至40 MHz的频率范围内进行了温度变化的介电研究。由于这些液晶二聚体的特殊形状,本研究具有重要意义。介电结果表明,样品在MHz区存在弛豫模式。试样的弛豫模式遵循Cole-Cole理论。利用Cole-Cole图对松驰频率和松驰强度进行了评价。此外,还通过阿伦尼乌斯图计算了该材料的活化能,其数值高于其他常规液晶材料。
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引用次数: 0
One step colloidal route for the preparation of lead sulfide nanoparticles using thiol 一步胶体路线制备硫醇硫化铅纳米颗粒
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609229
A. Rohom, Ankush R. Lande, S. Patil, N. Chaure
Lead sulfide (PbS) nanoparticles were prepared in an aqueous solution using 2-Mercaptoethanol as a capping agent by simple colloidal route. The structural, optical, morphological and compositional analysis were carried out by using X-ray diffraction (XRD), Optical absorption spectroscopy, Transmission electron microscopy (TEM) and Energy dispersive X-ray analysis (EDAX) respectively. Effect of concentration of 2-Mercaptoethanol on particle size was investigated. In the absence of capping agent the yield of PbS particles was maximum. XRD shows the formation of PbS nanoparticles with cubic structure. Absorption spectra reveals the blue shift with increase in the concentration of 2-Mercaptoethanol due to decrease in particle size. EDAX study confirms the formation of stoichiometric PbS nanoaprticles for all concentration of 2-Mercaptoethanol. The average particle size of PbS nanoparticles synthesized in presence of 0.5 wt% 2-Mercaptoethanol observed from TEM image is 15 nm. SAED pattern shows all diffraction rings are indexed to cubic structure of PbS. The interplaner distance `d' observed from HRTEM image is equal to 1.3612 Å which corresponds to (420) plane.
以2-巯基乙醇为封盖剂,采用简单的胶体法制备了硫化铅纳米颗粒。采用x射线衍射(XRD)、光吸收光谱、透射电子显微镜(TEM)和能量色散x射线分析(EDAX)对材料进行了结构、光学、形态和成分分析。考察了2-巯基乙醇浓度对颗粒大小的影响。在不加封盖剂的情况下,PbS颗粒的产率最高。XRD分析表明,生成了具有立方结构的PbS纳米颗粒。吸收光谱显示,随着2-巯基乙醇浓度的增加,由于颗粒尺寸的减小而发生蓝移。EDAX研究证实了所有浓度的2-巯基乙醇的化学计量PbS纳米颗粒的形成。在0.5 wt% 2-巯基乙醇存在下合成的PbS纳米颗粒的平均粒径为15 nm。SAED图谱显示,所有衍射环都指向PbS的立方结构。HRTEM图像观测到的层间距离d = 1.3612 Å,对应于(420)平面。
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引用次数: 0
Enhancement of anisotropic magnetoresistance in zigzag graphene nanodevices 之字形石墨烯纳米器件中各向异性磁阻的增强
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609276
Amutha V. Subramani, Arijit Sen
We theoretically investigate the anisotropic charge transport behavior of zigzag graphene nanodots (zGNDs) connected to ferromagnetic nanoelectrodes. It turns out that when a zGND is attached to Ni-electrodes through S-linkers, the spin-polarized conductance exhibits oscillatory behavior with a maximum peak around θ ≈ 18°. A small change in the anisotropic spin polarization can thus cause a sudden jump in the device conductance. The two states of electronic conductance obtained by simply tuning the electrode magnetization may well serve as 1s and 0s to find potential utilities in designing spintronic logic circuits at the nanoscale.
我们从理论上研究了与铁磁纳米电极连接的之字形石墨烯纳米点(zGNDs)的各向异性电荷输运行为。结果表明,当zGND通过s -连接器连接到ni电极上时,自旋极化电导表现出振荡行为,最大峰值在θ≈18°附近。因此,各向异性自旋极化的微小变化可以导致器件电导的突然跳跃。通过调整电极磁化强度获得的两种电子电导状态可以很好地用作1s和0s,从而在纳米级自旋电子逻辑电路的设计中找到潜在的应用。
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引用次数: 2
Luminescence properties of nanocrystalline SrAl2O4: Eu, Dy phosphor synthesized by combustion technique 燃烧法制备SrAl2O4: Eu, Dy纳米晶荧光粉的发光性能
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609235
D. S. Kshatri, A. Khare, S. Mishra
The nanocrystalline SrAl2O4: Eu2+, Dy3+ phosphor powders have been synthesized by combustion process. The as-obtained phosphor is characterized by means of X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX) studies. The photoluminescence (PL), thermoluminescence (TL) and the afterglow properties of the SrAl2O4: Eu2+, Dy3+ phosphor are also investigated. After irradiated with ultraviolet (UV) light, the phosphors emitted green long lasting phosphorescence with an excitation peak at 340 nm and emission peak at 514 nm ascribed to the characteristic 5d-4f transition of Eu2+.
采用燃烧法制备了纳米晶SrAl2O4: Eu2+, Dy3+荧光粉。通过x射线衍射(XRD)、扫描电子显微镜(SEM)、能量色散x射线光谱(EDX)等研究手段对所得荧光粉进行了表征。研究了SrAl2O4: Eu2+, Dy3+荧光粉的光致发光(PL)、热致发光(TL)和余辉性能。在紫外光照射下,荧光粉发出绿色持久磷光,激发峰在340 nm,发射峰在514 nm,这归因于Eu2+的5d-4f跃迁特征。
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引用次数: 0
Experimental investigation on aluminium LM4 strengthened by Al2O3 nano particle 纳米Al2O3增强铝LM4的实验研究
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609304
M. Arun, T. Ponnusamy, K. Saravana, Prabhu R. Saravana, R. Shyamaprasad
The effect of characteristics of aluminium based composite with varying the composition (1, 1.5, 2.5, 5 vol.%) nano sized Al2O3 particles at 950°C preheating temperature was investigated. The composite were fabricated by stir casting techniques at atmospheric condition without the use of flux or protective inert gas atmosphere. The nano-particles were uniformly dispersed in stir method and the average grain sizes of composites in 40nm. The mechanical property of fabricated composite was calculated by using of mechanical testing method. The results show that presence of nano size Al2O3 particles better property values. This study is an attempt to investigate the effects of adding nano particles to aluminium metal matrix. Also it was found that the Al2O3 particles play a significant role in improving tensile value of alloying system. The optimum amount of reinforcement determined by evaluating the density and mechanical properties of composites. Hardness and impact tests were carried out in order to identify mechanical properties. The results shows that the composite containing 1.5vol.% reinforcement particles fabricated have homogeneous microstructure as well as improved mechanical properties.
研究了950℃预热温度下纳米Al2O3颗粒组成(1、1.5、2.5、5 vol.%)对铝基复合材料性能的影响。采用搅拌铸造工艺在常压条件下制备了该复合材料,不使用助熔剂或保护性惰性气体气氛。搅拌法制备的纳米颗粒均匀分散,复合材料的平均晶粒尺寸在40nm左右。采用力学试验方法计算了复合材料的力学性能。结果表明,纳米级Al2O3颗粒的存在具有较好的性能值。本研究旨在探讨在铝金属基体中加入纳米颗粒的效果。同时发现Al2O3颗粒对提高合金体系的拉伸值有显著作用。通过评价复合材料的密度和力学性能,确定最佳补强量。进行了硬度和冲击试验,以确定其机械性能。结果表明,该复合材料含有1.5vol。制备的增强颗粒具有均匀的微观结构和提高的力学性能。
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引用次数: 1
A low complex real photonic OFDM for Radio-over-Fiber system 一种用于光纤无线通信系统的低复杂度实光子OFDM
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609358
P. Sreedevi, N. Vijayakumar
All-optical Orthogonal Frequency Division Multiplexing (OFDM) evokes a new regime in advanced optical communication at extreme data rates, as subcarriers are multiplexed and demultiplexed using trigonometric transforms. This paper shows that real trigonometric transforms can advantageously replace the Fourier Transform in optical communication systems, for all-optical signal processing. A low-complex, real trigonometric transform-based Orthogonal Frequency Division Multiplexing for Radio-over-Fiber system (RoF) is presented. The modulation/demodulation is performed by using the Fast Hartley Transform (FHT). The system is modeled and simulated using latest commercial software, Optisystem. This is an exquisite method that uses standard components of optical telecommunication. As a result this model can be used with different wireless communication systems such as high date rate Wireless LANs, Fiber-To-Home (FTTH), Wi-Max and the 4th generation cellular systems. It also find applications in inter connecting nano-photonic systems remotely over wireless systems.
全光正交频分复用(OFDM)在极端数据速率下引发了先进光通信的新体制,因为子载波使用三角变换进行多路复用和解路复用。在光通信系统中,实三角变换可以很好地取代傅立叶变换,用于全光信号的处理。提出了一种低复杂度、基于实三角变换的光纤无线电系统(RoF)正交频分复用技术。调制/解调是通过使用快速哈特利变换(FHT)进行的。该系统采用最新的商业软件Optisystem进行建模和仿真。这是一种利用光通信标准元件的精巧方法。因此,该模型可用于不同的无线通信系统,如高数据速率无线局域网,光纤到户(FTTH), Wi-Max和第四代蜂窝系统。它也发现了应用在通过无线系统远程连接纳米光子系统。
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引用次数: 0
Real time glucose monitoring system based on enzymatic nanosensor 基于酶促纳米传感器的葡萄糖实时监测系统
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609324
S. N. Naveen Kumar, K. Gayithri, S. Kiran, N. Santhosh Kumar
In the present study Microcontroller based system for glucose monitoring is developed. The output of the conductometric nanosensor is taken as input to the glucose monitoring system. The output of the sensor varies with respect to the variation in glucose concentration. The output of the sensor is amplified by using an amplifier designed using IC 741. Amplified signal is fed to the input port “PORT A” of PIC 16F877 microcontroller. Microcontroller processes and analyses the amplified voltage and the result will be displayed on 16×2 LCD interfaced to it. An LCD displays various glucose concentration based on the condition as LOW, NORMAL, and HIGH.
本研究开发了一种基于单片机的血糖监测系统。电导纳米传感器的输出作为葡萄糖监测系统的输入。传感器的输出值随葡萄糖浓度的变化而变化。传感器的输出通过使用IC 741设计的放大器进行放大。放大后的信号被送入pic16f877微控制器的输入端口“port A”。单片机对放大后的电压进行处理和分析,结果显示在16×2液晶显示器上。LCD显示各种葡萄糖浓度的基础上的条件为低,正常,和高。
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引用次数: 2
Synthesis and optical properties of Vanadium doped Covellite nanostructure by wet chemical method 湿化学法制备掺钒钴石纳米结构及其光学性质
Pub Date : 2013-07-24 DOI: 10.1109/ICANMEET.2013.6609231
N. Kandasamy, S. Saravanan
We have synthesized Vanadium doped Covellite nanocrystals, by a simple and environmentally begin technique involving the reaction of copper sulphate monohydrate, thiourea and doping agent V2O5. The products were characterized by XRD, SEM, and UV-Visible techniques. The morphology studies for covellite (CuS) nanoparticle obtained is seed like structure with size of 73-90nm. We confirm the monoclinic structure of Vanadium doped covellite nanoparticle through XRD data.
我们利用一水合硫酸铜、硫脲和掺杂剂V2O5的反应,用一种简单环保的技术合成了钒掺杂Covellite纳米晶体。采用XRD、SEM、uv -可见等技术对产物进行了表征。对cu纳米颗粒进行形貌研究,得到粒径为73 ~ 90nm的种子状结构。通过XRD数据证实了钒掺杂钴矿纳米颗粒的单斜晶型结构。
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引用次数: 4
期刊
International Conference on Advanced Nanomaterials & Emerging Engineering Technologies
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