Materials Literature
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DPPZ showed UV-Vis. and PL maximum values of 412 and 638 nm, meaning the large stokes shift. Blue host compound, TAT was synthesized and used for co-mixed white emission. TAT exhibited UV-Vis. and PL maximum values of 403 nm and 445 nm in film state. Thus, when two compounds are used as co-mixed emitter in OLED device…
A new light-emissive material, bis-2-(4-(diphenylphosphino)phenyl)benzo[d]oxazole (DPB), has been synthesized and characterized by FT-NMR, FT-IR, UV-Vis and elemental analysis. DPB has the band gap of 4.3 eV between HOMO and LUMO levels. The photoluminescence (PL) of DPB was measured at 410 nm from the chloroform solu…
In the previous work, we have reported that organic photovoltaic (OPV) cells using DMDCNQI as an n-type second dopant material showed a high power conversion efficiency (PCE). In the present work, we have synthesized a novel DHDCNQI with long alkyl chains to improve the compatibility between the DHDCNQI dopant molecul…
Poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) nanofibers containing inorganic fillers were fabricated by electrospinning. Dye-sensitized solar cells (DSSCs) using these nanofibers showed improved short circuit currents without degraded fill factors or open circuit voltages. The long-term stabilities of ce…
研究了纳米0.1%(质量分数)Al颗粒对SnAgCu无铅钎料与铜基板之间界面反应的影响,研究两种无铅钎料界面在-55~125℃热循环过程中的生长行为及其焊点力学性能变化。结果表明:随着热循环次数的增加,界面层金属间化合物的厚度明显增加,焊后界面层金属间化合物为Cu6Sn5相,在热循环过程中在Cu6Sn5和Cu基板之间出现Cu3Sn相。发现纳米Al颗粒的添加,界面层金属间化合物的厚度明显减少,纳米颗粒对界面层的生长具有明显的抑制作用。同时对焊点在热循环过程中的可靠性进行分析,发现焊点的拉伸力随着循环次数的增加逐渐降低,含纳米Al颗粒的焊点具有明显的优越性,在焊点服役期间,焊点失效路径为Cu6Sn5/Cu3Sn的界面处。
Introduction In this chapter we shall begin our discussion of nonlinear phenomena that are important in optics. When one or more electromagnetic waves propagate through any medium they produce polarizations in the medium that, in principle, oscillate at all the possible sum and difference frequencies that can be gener…
采用金相、扫描电镜、电子背散射衍射、透射电镜分析及拉伸性能实验等测试分析手段,研究了Al-Zn-Mg-Cu-Zr-0.5%Er合金型材的组织性能。结果表明,合金型材中的元素Er主要以未溶的Al8Cu4Er相形式存在,该粒子可以钉扎位错和晶界的迁移,有效抑制合金回复再结晶和晶粒长大,保持合金的变形态组织。0.5%Er的添加使得合金型材的强度降低,主要是因为合金型材中残留了大量的Al8Cu4Er相,在变形过程中由于位错塞积形成裂纹,降低了合金的强度。但是,合金的电导率有所提高。
The course is tailored to give students a broad introduction to material properties and limitations which covers the fundamental material structure, class of material properties, measurement of the properties, the common micro-structural features of
小林秀雄「私小説論」は、自然主義文学の開始から私小説の展開 までを、その日本的な受容と展開として指弾した批評と認定した上 で検討されてきたが、一方では、小林秀雄の表現者としての指向性 も同時に読解しようという論考も提出されている。本稿は、この二 つの読解方法の再検討を通して、後者の問題提起を引き受けながら 「私小説論」とは何を問おうとした批評であったのかを考察する。 そして、この読解が、「私小説論」に至るまでの小林秀雄の表現言 説の参照へと導くことを確認し、一九三〇年から見出されていく 〈虚構〉、〈伝統〉、〈私〉という三つの概念とその文脈の成立過程を 時系列に確認しながら、その意味と、小林秀雄の言説の動きを追跡 し、一九三五年に至…
Microbial fuel cells (MFCs) are typically designed as a two-chamber system with the bacteria in the anode chamber separated from the cathode chamber by a polymeric proton exchange membrane (PEM). Most MFCs use aqueous cathodes where water is exposed to air to provide dissolved oxygen to electrode. To increase energy o…
In this study, Four different ratio of emulsified fuels are used as alternative fuels for four stroke, single cylinder, water cooled, naturally aspirated direct injection diesel engine to analyze the performance, emission and combustion characteristics, namely Specific Fuel Consumption (SFC), Brake Thermal Efficiency…
Combination of biomaterials with nanotechnology has been applied to the immobilization of chitosan on nano-gold particles by plasma and grafting treatments. In this study, gold (Au) nanoparticles were first synthesized by chemical reduction method using mixing solution of HAuCl44H2O and sodium citrate or NaBH4. The sy…
We present an extension of the Allen-Cahn/Cahn-Hilliard system that incorporates a geometrically linear ansatz for the elastic energy of the precipitates. The model contains both the elastic Allen-Cahn system and the elastic Cahn-Hilliard system as special cases, and accounts for the microstructures on the microscopic…
theplasmon modes and resonances of such nano-objects arefairly similar to (the Babinet principle is exact only when theconstituting metal is a perfect conductor) the original objects.As such, the plasmons of such complementary nanostruc-tures can be equally good, or even better (in terms of ease offabrication), struct…
We prepared solid spheres, with diameters between 100 and 400 nm, encapsulating silver nanocrystallites (about 20 ± 10 nm in diameter), by heating colloidal solutions of silver in methoxyethanol at 120 °C. Stable coatings were obtained using spin coating and rapid thermal processing on optical glass substrates. UV-Vis…
A unique synthesis method was developed, which is called solution combustion method (SCM). TiO2 nanoparticles were synthesized by this method. These SCM TiO2 nanoparticles (~35 nm) were added to the dielectric layers of AC powder electroluminescence (EL) devices. The dielectric layers were made of commercial BaTiO3 pa…
Proton irradiations from the backside of the AlGaN/GaN high electron mobility transistors (HEMTs) were employed to enhance its off-state drain breakdown voltage. Via holes were fabricated directly under the active area of the HEMTs by etching through the Si substrate for the backside irradiations. The steep drop at th…
InGaN/GaN multiple quantum well (MQW) and light emitting diode (LED) structures with different GaN barrier growth temperatures have been grown by metalorganic chemical vapor deposition (MOCVD). Atomic Force Microscopy (AFM)-Conductive AFM (CAFM) analysis has been performed to study the submicron scale structural and e…
InGaN, a III-Nitride semiconductor, has bandgaps between 0.7 eV (InN) and 3.39 eV (GaN), covering the entire visible spectrum, which makes InGaN an important material for photonic applications. To utilize the full range of InGaN’s bandgap, methods for material growth with increased indium content must be established.…
A method for the characterization of multiple quantum well (MQW) light emitting diodes(LEDs) is investigated. This method involves taking the I-V curve of the LED while it is irradiated with photons near the absorption edge of the quantum wells within the device under test. A number of features are observed on the I-V…