5,495 research outputs found
Integration of electrodeposited PdNi alloys with silicon and carbon nanotube electronics
No full textThis thesis investigates the electrodeposition of PdNi films with controllable composition and their suitability as electrical contacts in electronic and spintronic devices based on Silicon and Carbon nanotubes (CNTs). The electrodeposition process and characterisation of the electrical and magnetic properties of the deposited PdNi films are described. PdNi films with a wide composition range can be deposited from the same bath by changing the deposition potential. Electrical characterisation shows the formation of high quality PdNi-Si Schottky barriers while magnetic measurements prove the ferromagnetic nature of the PdNi films. Electrodeposited PdNi films are thus shown to be suitable contacts for electronic and spintronic devices.Hydrogen sensors comprising back to back electrodeposited PdNi-Si Schottky barriers are fabricated and characterised. The back to back architecture ensures low current operation at all biases. Palladium causes the Hydrogen molecules to dissociate and be absorbed by the film, while Nickel makes the sensor resistant to repeated cycling in the Hydrogen environment. The sensors exhibit extremely low idle currents, large percentage current increases on Hydrogen exposure and high selectivity for Hydrogen. These factors, in addition to the simplicity of fabrication and easy integration with conventional electronics show that electrodeposited PdNi-Si Schottky barriers are well suited for use as Hydrogen sensors.The workfunction change in PdNi films exposed to Hydrogen is used to characterise CNTs contacted by electrodeposited PdNi. The PdNi contacted CNTs exhibit ohmic characteristics, which change on exposure to Hydrogen. Examining this change allows differentiation between semiconducting and metallic CNTs. Raman spectroscopy is used to characterise the same CNTs and the results are compared with the electrical characterisation in Hydrogen. The electrical and Raman analysis experimentally verify the theoreticallyassigned CNT Raman features.The fabrication and electrical characterisation of CNT transistors incorporating electrodeposited PdNi contacts are presented. The CNTs are spin coated from a 1,2-dichlorobenzene dispersion and contacted with electrodeposited PdNi. The PdNi-Si Schottky barrier is used to suppress the current through the Silicon substrate during electrical characterisation. The operating restrictions imposed by the direct PdNi-Si contact and methods to overcome the same are discussed. The characteristics of the CNT transistor in a changing magnetic field at room temperature are presented
Appendix_2-1._Overall_survival_in_SR – Supplemental material for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients
No full textSupplemental material, Appendix_2-1._Overall_survival_in_SR for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients by Seong Min Lee, Ho Cheol Choi and Min Kyung Hyun in Integrative Cancer Therapies</p
Appendix_2-2._Overall_Survival_in_MA – Supplemental material for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients
No full textSupplemental material, Appendix_2-2._Overall_Survival_in_MA for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients by Seong Min Lee, Ho Cheol Choi and Min Kyung Hyun in Integrative Cancer Therapies</p
Appendix_3-1._Pain_in_SR – Supplemental material for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients
No full textSupplemental material, Appendix_3-1._Pain_in_SR for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients by Seong Min Lee, Ho Cheol Choi and Min Kyung Hyun in Integrative Cancer Therapies</p
Appendix_1-2._Quality_of_life_in_MA – Supplemental material for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients
No full textSupplemental material, Appendix_1-2._Quality_of_life_in_MA for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients by Seong Min Lee, Ho Cheol Choi and Min Kyung Hyun in Integrative Cancer Therapies</p
Appendix_4-2._Depression_in_MA – Supplemental material for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients
No full textSupplemental material, Appendix_4-2._Depression_in_MA for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients by Seong Min Lee, Ho Cheol Choi and Min Kyung Hyun in Integrative Cancer Therapies</p
Appendix_4-1._Depression_in_SR – Supplemental material for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients
No full textSupplemental material, Appendix_4-1._Depression_in_SR for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients by Seong Min Lee, Ho Cheol Choi and Min Kyung Hyun in Integrative Cancer Therapies</p
Appendix_1-1._Quality_of_life_in_SR – Supplemental material for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients
No full textSupplemental material, Appendix_1-1._Quality_of_life_in_SR for An Overview of Systematic Reviews: Complementary Therapies for Cancer Patients by Seong Min Lee, Ho Cheol Choi and Min Kyung Hyun in Integrative Cancer Therapies</p
Universal service policies In Korea: Past and future
No full textKorean telecommunications policies have traditionally put more emphasis on equity than on efficiency. During the 1980s, the Ministry of Communications (MOC) and the Korea Telecommunication Authority (KTA) endeavored to provide universalservice by two epoch-making policies—the Immediate Telephone Installation System (ITIS) and the Widening and Automation (WA), both of which aimed to expand subscription network, quantitatively and qualitatively. With remarkable success in the 1980s and entering the 1990s, the MOC contemplates a new, innovative type of universalservicepolicy designed for increasing usage, the Nationwide Unified Telephone Rating System (NUTRS). Reviewing the economic and social environment of Korea that was conducive to the shaping of the ITIS and the WA, this article explores expected political and economic implications of the NUTRS
Suppression of adiabatic shear band formation by martensitic transformation of retained austenite during split Hopkinson pressure bar test for a high-strength bainitic steel
No full textIn this study, a high-strength bainitic steel was fabricated and austempered at 350 ?C for 15 min, 90 min, and 24 h to control the volume fraction of retained austenite (RA) while keeping an appropriate hardness level. Their dynamic compressive properties were investigated in relation to the ASB formation and cracking by the SHPB. The specimen austempered for 90 min showed the highest volume fraction of RA along with the highest compressive properties. This specimen also possessed the high resistance to form a transformation-ASB (tASB), which was attributed to the active deformation-induced martensitic transformation of RA. Since the applied dynamic energy was consumed by the martensitic transformation as well as the ASB formation, the active transformation effectively delayed the critical strain for initiating formation. Therefore, this critical strain concept, which was well correlated with dynamic compressive properties, would be an important key factor for suppressing the ASB formation and for improving the ballistic performance.11Nsciescopu
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