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Haraguchi, Hiroki,Itoh, Akihide,Kimata, Chisen 한국분석과학회 1995 분석과학 Vol.8 No.4
A study on elemental speciation of trace metals in lake water (Lake Biwa in Japan) has been carried out by a size exclusion chromatography (SEC) / inductively coupled plasma mass spectrometry (ICP-MS) system. Before analysis, the water sample was preconcentrated with a ultrafiltration technique, where the large molecules with molecular weight larger than 10,000 were concentrated. Then the preconcentrated water samples (500-1000 fold) were analyzed by a SEC/ICP-MS system. Most trace metals were found at the UV absorption peaks corresponding to the molecular weights of ca. 300,000 and 10,000-50,000, where trace metals were on-line detected by ICP-MS. The results suggest that many of trace metals exist as the large organic molecules-metal complexes in natural water.
Current-voltage characteristics of GaAs nanowhiskers
K. Haraguchi,K. Hiruma,T. Katsuyama,T. Shimada 한국물리학회 2006 Current Applied Physics Vol.6 No.1
The current–voltage characteristics of GaAs whiskers with an average diameter of 100nm and a population of 100–1000 were measured using a device structure with two terminal electrodes. An ohmic contact to the tip of whiskers which were buried in spin-on glass between a metal electrode and n-type GaAs(111)As substrate was realized by heat treatment at 430C. The measured results show that the current–voltage curve for the whiskers is better approximated by the polynomial of the voltage to the power of 1.5 than by the exponential of the voltage. The dependence of the current on the voltage suggests that a space-charge layer was formed in the nanowhiskers. Step-like current fluctuations were also observed at 77K, and this behavior was reproducible and unchanging even under a magnetic field. This suggests that the charge on the surface of the whiskers had a significant effect on carrier transport along the whiskers. 2004 Elsevier B.V. All rights reserved.
A minute phase difference measurement circuit with OTA
Naoya Haraguchi,Akio Shimizu,Sumio Fukai,Eiichi Mukai 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In this paper, we proposed a new minute phase difference measurement circuit. The conventional circuit is composed of OPA (Operational Amplifier). However, the amplitude adjustment is manual and measurement time is long. The proposed circuit is composed of the minute phase difference measurement circuit with OTA (Operational Transconductance Amplifier), and the automatic amplitude adjustment circuit with FPGA (Field Programmable Gate Array). And the measurement time of proposed circuit will be short. The performance of the proposed circuit is evaluated by Verilog-XL simulation. Simulation and experiment results show that the proposed circuit is able to the automatic amplitude adjustment, and measurement time is short.