Solving hierarchical helical mesostructures by electron tomography
A direct method to determine the pitch and chirality of complicated hierarchical helical mesostructures is presented by using the state-of-the-art electron tomography technique.
Materials Literature
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Morphological and quantitative frictional measurements of cotton fibres using friction force microscopy
Morphological and quantitative frictional measurements have been carried out on cotton fibres in dry air and in a liquid environment using friction force microscopy (FFM). Height and friction images acquired by FFM revealed that the cotton surface was damaged over 20 detergent-only wash cycle, but the inclusion of con…
Design, Modeling, and Optimization for Highly Efficient Ionic Wind-Based Cooling Microfabricated Devices
The purpose of this work is to re-design, model and optimize a single microfabricated ionic wind pump device [1]. The device could then be employed in a three-dimensional array for use in larger-scale microchip cooling and enhanced thermal spreading applications. The innovative microfabricated air-cooling technology e…
Temperature-Dependent Characteristics of a GaN/InGaN/ZnO Heterojunction Bipolar Transistor
This work presents dc characteristics (gain and leakage current) of a GaN/InGaN/ZnO npn collector-up heterojunction bipolar transistor (HBT) measured at 300, 200, and 100 K. The GaN-based epilayers of HBT were grown by metallorganic chemical vapor deposition, and the n-ZnO film was then deposited on top of p-InGaN by…
Effects of static eccentricity in axial flux permanent magnet machines
Due to manufacturing imperfectness of mechanical parts, the rotor eccentricity is unavoidable, which has considerable effect on motor's characteristics. Eccentricity is one of the common reasons, which creates most of the mechanical faults and leads to motor vibration. This paper describe a 28 pole axial flux permanen…
Raman spectroscopic study of the antimonate mineral lewisite (Ca, Fe, Na)2(Sb, Ti)2O6(O, OH)7
The mineral lewisite, (Ca, Fe, Na)2(Sb, Ti)2O6(O, OH)7, an antimony-bearing mineral, has been studied by Raman spectroscopy. A comparison is made with the Raman spectra of other minerals, including bindheimite, stibiconite, and roméite. The mineral lewisite is characterised by an intense sharp band at 517 cm−1 with a…
Xe interacting with porous silicon
Thin films of porous silicon (PS), structurally characterized by HR-SEM, were studied using xenon Temperature Programmed Desorption (TPD) as a probe of its inner pores. Geometric hindrance of the depth desorbing population and multiple wall collisions result in a unique double-peak structure of the TPD curve. Surface-…
Heat capacity and thermodynamic functions of 4,4′-dimethylbiphenyl and 4,4′-di-tert-butylbiphenyl
The heat capacity (C p m ) of 4,4′-dimethylbiphenyl and 4,4′-di-tert-butylbiphenyl in the temperature range of 8—373 K was measured by low-temperat ure adiabatic calorimetry, and thermodynamic characteristics of the solid-phase transitions of 4,4′-d i-tert-butylbiphenyl were determined. Temperatures, enthalpies, entro…
Oxide-catalyzed growth of Ag2O/Zn2SnO4 hybrid nanowires and their reversible catalytic ambient ethanol/oxygen detection
Large scale hybrid nanowires consisting of Zn2SnO4 periodic nanowires and Ag2O nanoparticles on both nanowire surfaces and tips have been successfully synthesized at 650 °C using a unique one-step silver oxide catalyzed vapor-solid-solid (VSS) growth process. The single crystal Zn2SnO4 nanowires mainly grew along the…
Structural, Magnetic and Dielectric Studies on Strontium Substituted Nd2CuO4 System
The substitution of Strontium on T'–structured Nd2CuO4 system has been carried out through solid state reaction tech-nique. From the Powder XRD patterns, it is found that the compounds are formed in single phase and crystallizes in orthorhombic structure. The variation in lattice parameters with decreasing nature of v…
A Novel Synthesis of Nanostructured ZnO via Thermal Oxidation of Zn Nanowires Obtained by a Green Route
ZnO nanowires were synthesised in a green and novel, two-step process: (1) the production of Zn nanowires by carbo-thermal reduction of a mixture of ZnO/biopitch (Eucalyptus sp. tar pitch) at 900°C for 1 h in a quartz tube placed in an electric furnace in a N2 atmosphere and (2) the oxidation of the as-prepared Zn nan…
Effect of Hardness Ratio on Plastic Dissipation in Fine Particle Peening
A large number of tiny particles, which is less than 200 µm in diameter, hit the specimen simultaneously for the surface modification in Fine Particle Peening (FPP) treatments. For the fatigue resistance, it is important to induce the higher compressive stress at the surface. In FPP treatment, the induced compressive…
A general method for faithful replication of keratin fibers with metal oxides
An easily controlled two-step surface precipitation approach using an inorganic metal salt as a precursor is developed to faithfully replicate micro-fibrous oxides from keratin fibers in a practical and environmentally benign manner.
Seedless synthesis of gold nanorods employing isopropyl radicals generated using gamma radiolysis technique
The one step synthesis of short aspect ratio gold nanorods using gamma radiation method by incorporating cetyltrimethyl ammonium bromide (CTAB) as a directing agent is reported in this communication. In present method of synthesis, isopropyl radical is selectively generated in the system by carrying out radiolysis of…
Heat-Resistant and Mechanical Property of Jute Continuous Fiber Reinforced PLA
Due to the increasing of the environmental issues, in recent years, natural fiber reinforced biodegradable polymers, green-composites, has attracted attention. Within these green-composites, natural fiber reinforced PLA has attracted considerable attention. The disadvantages of natural fiber reinforced PLA are low hea…
Introduction of Hot Isostatically Pressed, Reactor Coolant System Components in PWR Plant
This paper presents an overview of the work undertaken by Rolls-Royce to introduce Hot Isostatically Pressed (HIP) components into Pressurised Water Reactor plant, and also results of non-destructive and destructive examinations of a thick-walled pressure vessel. It presents the work from a design justification/manufa…
Application of new forming and sintering techniques to obtain hydroxyapatite and β-TCP nanostructured composites
Abstract Calcium phosphate based bioceramics have an important position in the bone substitutions field, because of their excellent biocompatibility, bioactivity and osteoconduction characteristics. To enhance the bone ingrowth between implants and natural bone a hydroxyapatite/ß-tricalcium phosphate (HA/ß-TCP) compos…
Effect of Solution Treatment Temperature on Trigger Stress for Stress Induced Martensitic Transformation in Ti-10V-2Fe-3Al Alloy
Effect of solution treatment temperature on trigger stress for stress induced martensitic transformation (SIMT) in Ti-10V-2Fe-3Al alloy has been investigated. The Ti-10V-2Fe-3Al tensile specimens were solution treated at 700-900°C and quenched to room temperature in water. All specimens, except the one solution treate…
Bending Response of Sandwiched Double Tube Structures with Aluminum Foam Core
Three point bending response of sandwiched double cylindrical tube structures with aluminum foam core was studied numerically using the explicit finite element method. The numerical results are in good agreement with the corresponding experimental results and display the advantage of this new structure in load carryin…
高性能偏振薄膜的制备
The optical performance of thin film polarizers is highly sensitive to the layer thicknesses of thin film. The thicknesses of the sensitive layers are optimized in order to gain broader polarizing zone in such case when the total layer thickness does not increase. An automatic layer thickness control system is establi…