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Search Results: 1 - 10 of 1314 matches for " Hiroki Nakaie "
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Reduction of Dislocation Densities of Ge Layers Grown on Si Substrates by Using Microwave Plasma Heating and Fabrication of High Hole Mobility MOSFETs on Ge Layers  [PDF]
Hiroki Nakaie, Tetsuji Arai, Chiaya Yamamoto, Keisuke Arimoto, Junji Yamanaka, Kiyokazu Nakagawa, Toshiyuki Takamatsu
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.51006
Abstract:
We have developed a microwave plasma heating technique to rapidly heat the transition metal. W/SiO2 layers were deposited on Ge/Si heterostructures. By heating the W, dislocations in Ge layers originated from lattice mismatch between Ge and Si crystals were reduced drastically. We have fabricated p- MOSFETs on Ge/Si substrates and realized higher mobility of about 380 cm2/ Vs than that of Si p-MOSFET.
STEM Moiré Observation of Lattice-Relaxed Germanium Grown on Silicon  [PDF]
Junji Yamanaka, Chiaya Yamamoto, Hiroki Nakaie, Tetsuji Arai, Keisuke Arimoto, Kosuke O. Hara, Kiyokazu Nakagawa
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.51014
Abstract:
We deposited Ge films on Si substrates by molecular beam epitaxy (MBE) method. The specimens were annealed at around 750 C using microwave- plasma heating technique which we had reported before. After these pro- cesses, we carried out special scanning transmission electron microscopic (STEM) observation. The moiré between the crystal lattices and the scanning lines controlled by STEM was utilized to show lattice-spacing distribution. The results exhibited that we were succeeded in forming lattice-relaxed Ge thin films. It was also recognized that this STEM moiré technique is very useful to observe lattice-spacing distribution for large area with high resolution.
Formation of Poly-Si Films on Glass Substrates by Using Microwave Plasma Heating and Fabrication of TFT’s on the Films  [PDF]
Hiroki Nakaie, Tetsuji Arai, Keisuke Arimoto, Junji Yamanaka, Kiyokazu Nakagawa, Kazuki Kamimura, Toshiyuki Takamatsu
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.61003
Abstract:
We have developed an apparatus for producing high-density hydrogen plasma. The atomic hydrogen density was 3.0 × 1021 m?3 at a pressure of 30 Pa, a microwave power of 1000 W, and a hydrogen gas flow rate of 5 sccm. We confirmed that the temperatures of tungsten films increased to above 1000?C within 5 s when they were exposed to hydrogen plasma formed using the apparatus. We applied this phenomenon to the selective heat treatment of tungsten films deposited on amorphous silicon films on glass substrates and formed polycrystalline silicon films. To utilize this method, we can perform the crystalline process only on device regions. TFTs were fabricated on the polycrystalline silicon films and the electron mobilities of 60 cm2/Vs were obtained.
Selective Heating of Transition Metal Usings Hydrogen Plasma and Its Application to Formation of Nickel Silicide Electrodes for Silicon Ultralarge-Scale Integration Devices  [PDF]
Tetsuji Arai, Hiroki Nakaie, Kazuki Kamimura, Hiroyuki Nakamura, Satoshi Ariizumi, Satoki Ashizawa, Keisuke Arimoto, Junji Yamanaka, Tetsuya Sato, Kiyokazu Nakagawa, Toshiyuki Takamatsu
Journal of Materials Science and Chemical Engineering (MSCE) , 2016, DOI: 10.4236/msce.2016.41006
Abstract:

We developed an apparatus for producing high-density hydrogen plasma. The atomic hydrogen density was 3.1 × 1021 m?3 at a pressure of 30 Pa, a microwave power of 1000 W, and a hydrogen gas flow rate of 10 sccm. We confirmed that the temperatures of transition-metal films increased to above 800C within 5 s when they were exposed to hydrogen plasma formed using the apparatus. We applied this phenomenon to the selective heat treatment of nickel films deposited on silicon wafers and formed nickel silicide electrodes. We found that this heat phenomenon automatically stopped after the nickel slicidation reaction finished. To utilize this method, we can perform the nickel silicidation process without heating the other areas such as channel regions and improve the reliability of silicon ultralarge-scale integration devices.

Optimum Dark Adaptation Period for Evaluating the Maximum Quantum Efficiency of Photosystem II in Ozone-Exposed Rice Leaves  [PDF]
Hiroki Hiroki Kobayakawa, Katsu Imai
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.49215
Abstract:

Because the transient O3 injury of leaves is lost with time, the evaluation of O3 effect on the maximum quantum efficiency of PSII (Fv/Fm) is difficult. Thus, the authors examined Fv/Fm in rice leaves exposed to different O3 concentrations (0, 0.1, and 0.3 cm3·m-3, expressed as O0, O0.1, and O0.3) under different dark adaptation periods (0, 1, 5, 10, 20, and 30 min, expressed as D0, D1, D5, D10, D20

The Effects of Knee Joint Pain and Disorders on Knee Extension Strength and Walking Ability in the Female Elderly  [PDF]
Hiroki Sugiura, Shinichi Demura
Advances in Physical Education (APE) , 2012, DOI: 10.4236/ape.2012.24024
Abstract: This study examines the differences in leg strength and walking ability among groups with different knee problems. The participants were 328 elderly females (60 - 94 years old; mean age 76.1 years; SD = 6.2) who were classified into three groups: those without knee pain or a knee disorder, those with knee pain, and those with a knee disorder. The subjects took knee extension strength and 12 meter maximum effort walk tests. Knee extension strength was significantly lower in the groups with knee pain and a knee disorder than in the group without pain or a knee disorder. Walking speed was significantly slower in the group with a knee disorder than in the other two groups. In conclusion, the female elderly with knee pain or a knee disorder are inferior in knee extension strength and walking ability. In addition, the elderly with a knee disorder are inferior in walking ability to the elderly with knee pain.
Design of a Switched Capacitor Negative Feedback Circuit for a Very Low Level DC Current Amplifier  [PDF]
Hiroki Higa, Naoki Nakamura
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.44048
Abstract:

To miniaturize a very low level dc current amplifier and to improve its output response speed, the switched capacitor negative feedback circuit (SCNF), instead of the conventionally used high-ohmage resistor, is presented in this paper. In our system, a switched capacitor filter (SCF) and an offset controller are also used to decrease vibrations and offset voltage at the output of the amplifier using SCNF. The theoretical output voltage of the very low level dc current amplifier using SCNF is obtained. The experimental results show that the unnecessary components of the amplifier’s output are much decreased, and that the response speed of the amplifier with both the SCNF and SCF is faster than that using high-ohmage resistor.

Effects of Mild and Severe Knee Joint Pain on the Frequency of Falls and Fall Risk in Elderly Females  [PDF]
Hiroki Sugiura, Shinichi Demura
Pain Studies and Treatment (PST) , 2014, DOI: 10.4236/pst.2014.24020
Abstract: This study aimed to examine differences in the frequency of falls during the past year and fall risk among 392 elderly females was categorized into five groups on the basis of the knee pain expe-rienced: no knee pain, mild unilateral knee pain, mild bilateral knee pain, severe unilateral knee pain, and severe bilateral knee pain. The subjects participated in a fall risk survey comprising 50 items representing five risk factors: “symptoms of falling”, “disease and physical symptoms”, “en-vironment”, “behavior and character”, and “physical function”. The frequency of falls during the past year, score for each risk factor, and the total fall risk score were not significantly different between the mild unilateral and mild bilateral knee pain groups, and between the severe unilateral and severe bilateral knee pain groups. Therefore, these groups were pooled to form a mild knee pain group and a severe knee pain group and analyzed. The severe knee pain group had experienced a significantly greater number of falls during the past year compared with the no knee pain group. Furthermore, the symptom of falling score was significantly higher in the severe knee pain group than in the no knee pain group, while the disease and physical symptoms score was significantly higher in the mild and severe knee pain groups than in the no knee pain group. The physical function score and total fall risk score were significantly higher in the following order: the severe knee pain group, the mild knee pain group, and the no knee pain group. Our results indicate that for elderly females who can achieve ADL independently, the degree of knee pain (mild or severe) has a marked effect on fall risk, irrespective of laterality of the pain (unilateral or bilateral). Factors such as symptoms of falling, disease and physical symptoms, and physical function are also related to fall risk in this population. Furthermore, elderly individuals with severe knee pain experience frequent falls.
On the Quantum Mechanical Treatment of the Bateman-Morse-Feshbach Damped Oscillator with Variable Mass  [PDF]
Akira Suzuki, Hiroki Majima
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.716201
Abstract: The harmonic oscillator with time-dependent (indefinite and variable) mass subject to the force proportional to velocity is studied by extending Bateman’s dual Lagrangian and Hamiltonian formalism. To study the quantum analog of such a dissipative system, the Batemann-Morse-Feshback classical Hamiltonian of the damped harmonic oscillator with varying (time-dependent) mass is canonically quantized. In order to discuss the stability of the quantum dissipative system due to the influence of varying mass and the dissipative force, we derived a formula for the vacuum state of the dissipative system with the help of quantum field theoretical framework. It is shown that the formula based on this simple model could be used to study the influence of dissipation such as the instability due to the dissipative force and/or the variable mass. It is understood that the change in the oscillator mass corresponds to a control parameter in quantum dissipative systems.
Laterality and Accuracy of Force Exertion in Elbow Flexion  [PDF]
Hiroki Aoki, Shinichi Demura
Advances in Physical Education (APE) , 2017, DOI: 10.4236/ape.2017.71009
Abstract:
In elbow flexion, accuracy of force exertion on demand values might differ between dominant and non-dominant hands. This study examined laterality and accuracy of force exertion in elbow flexion. The participants were 22 right-handed, healthy young males (mean age 22.6 ± 4.3 yrs, mean height 172.7 ± 7.0 cm, mean mass 75.0 ± 12.3 kg). Demand values of 25%, 50%, and 75% of maximum voluntary contraction (MVC) were selected. Using subjective judgment, the participants exerted the elbow flexion strength of each arm on each demand value. Evaluation parameters were differences (errors) between demand and exertion values and their total error. The results of a two-way ANOVA (dominant and non-dominant arms × demand value) showed significant interaction. In multiple comparison tests, errors were greater in 25% MVC than in 50% and 75% MVC for both arms. However, no significant difference was found between arms. In conclusion, in both dominant and non-dominant arms, accuracy of force exertion in elbow flexion does not show laterality and is higher in greater demand values (over 50% MVC) than in lesser values (25% MVC).
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