Film-thickness dependence of 10 GHz Nb coplanar-waveguide resonators (2009)
Inomata, Kunihiro, Yamamoto, Tsuyoshi, Watanabe, Michio, Matsuba, Kazuaki, Tsai, Jaw-Shen
We have studied Nb lambda/2 coplanar-waveguide (CPW) resonators whose resonant frequencies are 10-11 GHz. The resonators have different film thicknesses, t=0.05, 0.1, 0.2, and 0.3 um. We measured at...
Power-dependent internal loss in Josephson bifurcation amplifiers (2009)
Watanabe, Michio, Inomata, Kunihiro, Yamamoto, Tsuyoshi, Tsai, Jaw-Shen
We have studied nonlinear superconducting resonators: lambda/2 coplanar-waveguide (CPW) resonators with Josephson junctions (JJs) placed in the middle and lambda/4 CPW resonators terminated by JJs,...
Single-electron transistors in electromagnetic environments (2003)
The current-voltage (I-V) characteristics of single-electron transistors (SETs) have been measured in various electromagnetic environments. Some SETs were biased with one-dimensional arrays of dc...
Circuit with small-capacitance high-quality Nb Josephson junctions (2003)
Watanabe, Michio, Nakamura, Yasunobu, Tsai, Jaw-Shen
We have developed a fabrication process for nanoscale tunnel junctions which includes focused-ion-beam etching from different directions. By applying the process to a Nb/(Al-)Al_2O_3/Nb trilayer, we...
Quantum Effects in Small-Capacitance Single Josephson Junctions (2003)
Watanabe, Michio, Haviland, David B.
We have measured the current-voltage (I-V) characteristics of small-capacitance single Josephson junctions at low temperatures (T=0.02-0.6 K), where the strength of the coupling between the single...
Small-Capacitance Josephson Junctions: One-Dimensional Arrays and Single Junctions (2003)
Watanabe, Michio, Haviland, David B.
We review experiments on small-capacitance Josephson junctions. When the Josephson junction is fabricated in the configuration of dc superconducting quantum interference device (SQUID), the Josephson...
Thesis (Ph. D.)--Oregon State University, 2003.
Typescript (photocopy).
Superconducting SET with tunable electromagnetic environment (2002)
Watanabe, Michio, Ishibashi, Koji, Aoyagi, Yoshinobu
We have studied the environmental effect on superconducting single-electron transistors (S-SETs) by biasing S-SETs with arrays of small-capacitance dc SQUIDs, whose effective impedance can be varied...
Critical exponents for the metal-insulator transition of ^{70}Ge:Ga in magnetic fields (2002)
Watanabe, Michio, Itoh, Kohei M., Morishita, Masashi, Ootuka, Youiti, Haller, Eugene E.
We have measured the electrical conductivity of nominally uncompensated ^{70}Ge:Ga samples in magnetic fields up to B=8 T at low temperatures (T=0.05-0.5 K) in order to investigate the...
Coulomb Blockade and Coherent Single-Cooper-Pair Tunneling in Single Josephson Junctions (2001)
Watanabe, Michio, Haviland, David B.
We have measured the current-voltage characteristics of small-capacitance single Josephson junctions at low temperatures (T < 0.04 K), where the strength of the coupling between the single junction...
Metal-Insulator Transition in Homogeneously Doped Germanium (2000)
We have measured the electrical conductivity of Ge:Ga samples prepared by neutron-transmutation doping of isotopically enriched 70Ge single crystals in order to study the metal-insulator transition...
Magetoresistance of RuO_2-based resistance thermometers below 0.3 K (2000)
Watanabe, Michio, Morishita, Masashi, Ootuka, Youiti
We have determined the magnetoresistance of RuO_2-based resistors (Scientific Instruments RO-600) between 0.05 K and 0.3 K in magnetic fields up to 8 T. The magnetoresistance is negative around 0.5 T...
Watanabe, Michio, Itoh, Kohei M., Ootuka, Youiti, Haller, Eugene E.
We have determined the localization length \xi and the impurity dielectric susceptibility \chi_{\rm imp} as a function of Ga acceptor concentrations (N) in nominally uncompensated ^{70}Ge:Ga just...
Watanabe, Michio, Itoh, Kohei M., Ootuka, Youiti, Haller, Eugene E.
We have investigated the temperature dependence of the electrical conductivity sigma(N,B,T) of nominally uncompensated, neutron-transmutation-doped ^{70}Ge:Ga samples in magnetic fields up to B=8 T...
Watanabe, Michio, Ootuka, Youiti, Itoh, Kohei M., Haller, Eugene E.
We report the low temperature carrier transport properties of a series of nominally uncompensated neutron-transmutation doped (NTD) ^{70} Ge:Ga samples very close to the critical concentration N_c...
Economics of Environmental Management in a Spatially Heterogeneous River Basin
Michio Watanabe, Richard M. Adams, JunJie Wu
This article examines the allocative efficiency of water quality management activities to protect endangered salmonid species in a heterogeneous watershed in the Pacific Northwest. Using an...
Watanabe, Michio, Adams, Richard M., Wu, Junjie
This research examines a spatially explicit allocation of habitat restoration activities in an Oregon watershed to meet water temperature targets for the benefit of endangered salmonid fish species....
Is the development of the agro-processing industry pro-poor?: The case of Thailand
Watanabe, Michio, Jinji, Naoto, Kurihara, Mitsuyo
We examine how the development of the agro-processing industry contributed to poverty reduction in Thailand. The effects on farmers' income are emphasized because most of the poor in Thailand are...