Tojo Tojo - Academia.edu (original) (raw)

Papers by Tojo Tojo

2008 Providence, Rhode Island, June 29 - July 2, 2008, 2008

In this study, we investigated effects of bacterial stress treatment on domination of hydrogen pr... more In this study, we investigated effects of bacterial stress treatment on domination of hydrogen producing bacteria. As the bacterial stress treatment to control hydrogen fermentation microflora, we tested heat stress (105°C , 2 h ) and freeze-thaw stress (a total of 3 cycles, each including -15°C, 12 h and 4°C, 6 h ). The effect of bacterial stress on glucose hydrogen fermentation characteristic was determined by batch test using glass bottles. The results of the batch cultivation indicated that hydrogen fermentation characteristics differ among the stressed microflora. This result suggests that each original seed source has the suitable bacterial stress treatment to increase the hydrogen production. At the same time, we conducted 16S rRNA gene based analysis of hydrogen fermentation microbial community by PCR-minigel-single-strand conformation polymorphism (PCR-minigel-SSCP) method. Clostridium species such as Clostridium butyricum were identified from hydrogen fermentation batch culture.

Physical Review B, 2008

The heat capacity of the single crystalline electride of ͑CaO͒ 12 ͑Al 2 O 3 ͒ 7 : e − ͑C12A7 : e ... more The heat capacity of the single crystalline electride of ͑CaO͒ 12 ͑Al 2 O 3 ͒ 7 : e − ͑C12A7 : e − ͒ with T c = 0.2 K was larger than that of electron-undoped C12A7 in the temperature range 0.085-5 K, reflecting the metallic nature of the electride. A superconducting transition was detected as a heat capacity jump ⌬C p = 3.4 mJ mol −1 K −1 , and the profile and magnitude of ⌬C p agreed well with those expected from the BCS theory. The electronphonon coupling constant ͑ ϳ 0.46͒ and Debye temperature ͑⌰ D ϳ 630 K͒ were much larger than those for alkali metals having s-like conduction electrons as in the present electride, suggesting that electrides having a rigid structure will be a class of BCS superconductors.

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 2002

ABSTRACT

Journal of Materials Chemistry, 2010

Ferroelectrics with perovskite structure (ABO 3), for example, lead titanate (PbTiO 3), are the m... more Ferroelectrics with perovskite structure (ABO 3), for example, lead titanate (PbTiO 3), are the most studied ferroelectric oxides because of their versatile properties for use in thin film capacitors, electronic transducers, actuators, high-k dielectrics, pyroelectric sensors, and nonlinear optics. The studies on nanostructured PbTiO 3 are limited, mainly due to the lack of facile synthetic techniques to prepare nano-sized PbTiO 3 , i.e., colloidal PbTiO 3 nanoparticles. Herein, we presented a novel nonaqueous, relatively low temperature, and highly scalable route to PbTiO 3 nanoparticles. The use of oleic acid as surface capping ligand provides nanoparticles with good solubility in organic solvents, thereby enabling the low-cost solution based processing. Rather than the use of expensive bimetallic alkoxide precursors, common chemicals were utilized in this non-hydrolytic thermal decomposition approach; moreover, there is no need for extremely high temperature and long reaction time, making it possible for the large scale synthesis.

Japanese Journal of Applied Physics, 1999

We studied the behaviors of excitation cross sections and electron capture cross sections as func... more We studied the behaviors of excitation cross sections and electron capture cross sections as functions of collision velocity using previous data of various collision systems. The structures peculiar to the intermediate velocity regime were recognized on the excitation cross sections. Close correlation of the excitation cross section to the electron capture cross section and a relaxation time longer than that for the electron capture process characterize the excitation process in the intermediate velocity regime. A model consisting of a two-step electron transfer process well explains the characteristics of the excitation cross sections in the intermediate velocity regime.

2008 Providence, Rhode Island, June 29 - July 2, 2008, 2008

In this study, we investigated effects of bacterial stress treatment on domination of hydrogen pr... more In this study, we investigated effects of bacterial stress treatment on domination of hydrogen producing bacteria. As the bacterial stress treatment to control hydrogen fermentation microflora, we tested heat stress (105°C , 2 h ) and freeze-thaw stress (a total of 3 cycles, each including -15°C, 12 h and 4°C, 6 h ). The effect of bacterial stress on glucose hydrogen fermentation characteristic was determined by batch test using glass bottles. The results of the batch cultivation indicated that hydrogen fermentation characteristics differ among the stressed microflora. This result suggests that each original seed source has the suitable bacterial stress treatment to increase the hydrogen production. At the same time, we conducted 16S rRNA gene based analysis of hydrogen fermentation microbial community by PCR-minigel-single-strand conformation polymorphism (PCR-minigel-SSCP) method. Clostridium species such as Clostridium butyricum were identified from hydrogen fermentation batch culture.

Physical Review B, 2008

The heat capacity of the single crystalline electride of ͑CaO͒ 12 ͑Al 2 O 3 ͒ 7 : e − ͑C12A7 : e ... more The heat capacity of the single crystalline electride of ͑CaO͒ 12 ͑Al 2 O 3 ͒ 7 : e − ͑C12A7 : e − ͒ with T c = 0.2 K was larger than that of electron-undoped C12A7 in the temperature range 0.085-5 K, reflecting the metallic nature of the electride. A superconducting transition was detected as a heat capacity jump ⌬C p = 3.4 mJ mol −1 K −1 , and the profile and magnitude of ⌬C p agreed well with those expected from the BCS theory. The electronphonon coupling constant ͑ ϳ 0.46͒ and Debye temperature ͑⌰ D ϳ 630 K͒ were much larger than those for alkali metals having s-like conduction electrons as in the present electride, suggesting that electrides having a rigid structure will be a class of BCS superconductors.

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 2002

ABSTRACT

Journal of Materials Chemistry, 2010

Ferroelectrics with perovskite structure (ABO 3), for example, lead titanate (PbTiO 3), are the m... more Ferroelectrics with perovskite structure (ABO 3), for example, lead titanate (PbTiO 3), are the most studied ferroelectric oxides because of their versatile properties for use in thin film capacitors, electronic transducers, actuators, high-k dielectrics, pyroelectric sensors, and nonlinear optics. The studies on nanostructured PbTiO 3 are limited, mainly due to the lack of facile synthetic techniques to prepare nano-sized PbTiO 3 , i.e., colloidal PbTiO 3 nanoparticles. Herein, we presented a novel nonaqueous, relatively low temperature, and highly scalable route to PbTiO 3 nanoparticles. The use of oleic acid as surface capping ligand provides nanoparticles with good solubility in organic solvents, thereby enabling the low-cost solution based processing. Rather than the use of expensive bimetallic alkoxide precursors, common chemicals were utilized in this non-hydrolytic thermal decomposition approach; moreover, there is no need for extremely high temperature and long reaction time, making it possible for the large scale synthesis.

Japanese Journal of Applied Physics, 1999

We studied the behaviors of excitation cross sections and electron capture cross sections as func... more We studied the behaviors of excitation cross sections and electron capture cross sections as functions of collision velocity using previous data of various collision systems. The structures peculiar to the intermediate velocity regime were recognized on the excitation cross sections. Close correlation of the excitation cross section to the electron capture cross section and a relaxation time longer than that for the electron capture process characterize the excitation process in the intermediate velocity regime. A model consisting of a two-step electron transfer process well explains the characteristics of the excitation cross sections in the intermediate velocity regime.