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Photonics Research 2022年第3期10卷 703-710页

作者： Kazuue Fujita Shohei Hayashi Akio Ito Tatsuo Dougakiuchi Masahiro Hitaka Atsushi nakanishi Central Research Laboratory Hamamatsu Photonics K.K.5000 HirakuchiHamakita WardHamamatsu 434-8601Japan

Room-temperature terahertz(THz)quantum cascade laser sources with intracavity difference-frequency nonlinear mixing are electrically pumped monolithic semiconductor laser sources operating in the 0.6–6 THz spectral *** report widely tunable,low-frequency THz quantum cascade laser sources using a lens-coupled Cherenkov waveguide *** on a watt-class high-power,λ∼13.7μm quantum cascade laser,the monolithic THz source is strongly coupled with a high-resistivity silicon lens,which causes a major increase in the THz coupling efficiency and demonstrates significant performance improvements.A room-temperature 1.5 THz device produces a 0.2 mW peak output power with a high-quality beam *** THz outcoupling efficiency using the lens-coupled scheme enabled the demonstration of a high-performance external-cavity semiconductor THz source that is tunable from 420 GHz to 2 *** external-cavity,lens-coupled device configuration can technically be assembled into a butterfly-style package for a thumb-sized,widely frequency tunable THz semiconductor source.

关键词： tunable waveguide pumped

Relationship between wear behaviour of ultra-high-molecular-weight polyethylene and surface profile of Co–Cr–Mo alloy in artificial joint

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Biosurface and Biotribology 2019年第1期5卷 1-7页

作者： Nana Motojima Yuta Nakashima Yukio Fujiwara Yoshihiro Komohara Motohiro Takeya Hiromasa Miura Kazunori Hino Hidehiko Higaki Hidehiro Hata Yoshitaka nakanishi Graduate School of Science and Technology Kumamoto University2-39-1 KurokamiCyuo-kuKumamoto 860-8555Japan Faculty of Advanced Science and Technology Kumamoto UniversityKumamotoJapan Faculty of Life Science and Technology Kumamoto UniversityKumamotoJapan Graduate School of Medicine Ehime UniversityEhimeJapan Faculty of Life Science Kyushu Sangyo UniversityFukuokaJapan

The relationship between the wear behaviour of an ultra-high-molecular-weight polyethylene(GUR1050)pin and surface profile of a Co-28Cr-6Mo alloy(ASTM F-75)disc was *** tests have been performed by pin-on-disc wear testing machine with multi-directional pathways,obtaining the influence of micro slurry-jet erosion(MSE)processed Co–Cr–Mo *** specific wear and the wear particles have been *** was elucidated that the Co–Cr–Mo alloy surface processed by MSE influenced the specific wear rate of polyethylene;however,the morphological aspect of polyethylene wear particles was not drastically *** wear particles isolated from the lubricating liquid were added to a culture medium,and human monocyte-derived macrophages were incubated by using an upright/inverted *** production of TNF-α and IL-6 seemed to have a correlation with the amount of wear particles added,however,the influence of particle size on the production of TNF-α and IL-6 was not *** means that the improvements for the incubation method,***/inverted method,need further investigation for the accurate analysis.

关键词： wear alloy behaviour

A novel equation and nomogram including body weight for estimating prostate volumes in men with biopsy-proven benign prostatic hyperplasia

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Asian Journal of Andrology 2012年第5期14卷 703-707页

作者： Yasukazu nakanishi Hitoshi Masuda Satoru Kawakami Mizuaki Sakura Yasuhisa Fujii Kazutaka Saito Fumitaka Koga Masaya Ito lunji Yonese Iwao Fukui Kazunori Kihara Department of Urology Tokyo Medical and Dental University Tokyo 113-8519 Japan Department of Urology Cancer institute Hospital Tokyo 135-8550 Japan

Anthropometric measurements, e.g., body weight （BW）, body mass index （BMI）, as well as serum prostate-specific antigen （PSA） and percent-free PSA （%fPSA） have been shown to have positive correlations with total prostate volume （TPV）. We developed an equation and nomogram for estimating TPV, incorporating these predictors in men with benign prostatic hyperplasia （BPH）. A total of 1852 men, including 1113 at Tokyo Medical and Dental University （TMDU） Hospital as a training set and 739 at Cancer Institute Hospital （CIH） as a validation set, with PSA levels of up to 20 ng m1-1, who underwent extended prostate biopsy and were proved to have BPH, were enrolled in this study. We developed an equation for continuously coded TPV and a logistic regression-based nomogram for estimating a TPV grater than 40 mh Predictive accuracy and performance characteristics were assessed using an area under the receiver operating characteristics curve （AUC） and calibration plots. The final linear regression model indicated age, PSA, %fPSA and BW as independent predictors of continuously coded TPV. For predictions in the training set, the multiple correlation coefficient was increased from 0.38 for PSA alone to 0.60 in the final model. We developed a novel nomogram incorporating age, PSA, %fPSA and BW for estimating TPV greater than 40 mh External validation confirmed its predictive accuracy, with AUC value of 0.764. Calibration plots showed good agreement between predicted probability and observed proportion. In conclusion, TPV can be easily estimated using these four independent predictors.

关键词： body weight equation nomogram prediction prostate-specific antigen prostate volume

Basket pattern blood flow signals discovered in a case of splenic hamartoma by power Doppler ultrasonography

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World Journal of Gastroenterology 2005年第33期11卷 5235-5238页

作者： Shigeo nakanishi Katsuya Shiraki Kouji Yamamoto Takeshi Nakano Mutsumi Koyama Takatsugu Yano Takayuki Sanda Hisao Tamaki Tadanori Hirano Kazuo Fukudome Akinori Ishihara First Department of Internal Medicine Mie University School of Medicine Tsu Mie 514-8507 Japan Department of Internal Medicine Matsusaka General Hospital Matsusaka Mie 102 Japan First Department of Internal Medicine Mie University School of Medicine TsuMie 514-8507Japan Department of Internal Medicine Matsusaka General Hospital Matsusaka Mie 102 Japan Department of Surgery Matsusaka General Hospital Matsusaka Mie 102 Japan Tadanori Hirano Department of Radiology Matsusaka General Hospital Matsusaka Mie 102 Japan First Department of Internal Medicine Mie University School of Medicine Tsu Mie 514-8507 Japan Department of Pathology Matsusaka General Hospital Matsusaka Mie 102 Japan

We present the gray-scale ultrasonography （GSUS）, power Doppler ultrasonography （PDUS）, abdominal computed tomography （CT）, and magnetic resonance imaging （MRI） findings for a case of splenic hamartoma in a 27-year-old man, showing a φ 50 mm homogeneous, iso- and hypo-echoic splenic mass with evidence of a small plural cystic lesion. This splenic hamartoma showed increased vascularity on power Doppler sonograms. PDUS showed multiple circular blood flow signals inside the mass （i.e. a basket pattern）, which was consistent with the small plural cystic lesion shown by GSUS. Spectral analysis also confirmed arterial and venous flow. CT scans showed that the mass had lowdensity relative to the normal spleen and MRI showed that the mass was isodense, relative to the normal spleen. Therefore, CT and MRI are not useful for the diagnosis of splenic hamartoma. Ultrasonography can be used to diagnose splenic hamartoma without administration of a contrast matedal and therefore is an indispensable method for the diagnosis of splenic hamartoma.

关键词： Splenic hamartoma Ultrasonography Basketpattern

Hydrogen and methane gases are frequently detected in the stomach

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World Journal of Gastroenterology 2006年第19期12卷 3088-3091页

作者： Yoshihisa Urita Susumu Ishihara Tatsuo Akimoto Hiroto Kato Noriko Hara Yoshiko Honda Yoko Nagai Kazushige nakanishi Nagato Shimada Motonobu Sugimoto Kazumasa Miki Department of General Medicine and Emergency Care Toho University School of Medicine Omori HospitalTokyoJapan Division of Gastroenterology and Hepatology Department of Internal Medicine Toho University School of MedicineOmori HospitalTokyoJapan

AIM： To investigate the incidence of bacterial overgrowth in the stomach by using a new endoscopic method in which intragastric hydrogen and methane gases are collected and analyzed. METHODS： Studies were performed in 490 consecutive patients undergoing esophagogastroscopy, At endoscopy, we intubated the stomach without inflation by air, and 20 mL of intragastric gas was collected through the biopsy channel using a 30 mL syringe, Intragastric hydrogen and methane concentrations were immediately measured by gaschromatography, H pylori infection was also determined by serology. RESULTS： Most of intragastric hydrogen and methane levels were less than 15 ppm （parts per million）. The median hydrogen and methane values （interquartile range） were 3 （1-8） ppm and 2 （1-5） ppm, respectively. The high hydrogen and methane levels for indication of fermentation were decided if the patient had the values more than 90 percentile range in each sample. When a patient had a high level of hydrogen or methane in one or more samples, the patient was considered to have fermentation. The overall incidence of intragastric fermentation was 15.4% （73/473）, Intragastric methane levels were higher in the postoperative group than in other groups. None of the mean hydrogen or methane values was related to Hpylori infection. CONCLUSION： Hydrogen and methane gases are more frequently detected in the stomach than expected, regardless of the presence of abdominal symptoms. Previous gastric surgery influences on the growth of methaneproducing bacteria in the fasting stomach.

关键词： Intragastric gases Hydrogen Methane Helicobacter pylori

Seventy-five gram glucose tolerance test to assess carbohydrate malabsorption and small bowel bacterial overgrowth

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World Journal of Gastroenterology 2006年第19期12卷 3092-3095页

AIM： To investigate non-invasively the incidence of absorption of carbohydrates in diabetic patients during an oral glucose tolerance test （OGTT） and to determine whether malabsorption may be associated with insulin secretion and insulin resistance. METHODS： A standard 75-g OGTT was performed in 82 diabetic patients. The patients received 75 g of anhydrous glucose in 225 mL of water after an overnight fasting and breath samples were collected at baseline and up to 120 rain after ingestion. Breath hydrogen and methane concentrations were measured. Blood glucose and serum insulin concentrations were measured before ingestion and at 30, 60, 90, 120 rain post-ingestion. RESULTS： When carbohydrate malabsorption was defined as subjects with an increase of at least 10 ppm （parts per million） in hydrogen or methane excretion within a 2-h period, 28 （34%） had carbohydrate malabsorption. According to the result of increased breath test, 21 （75%） patients were classified as small bowel bacterial overgrowth and 7 （25%） as glucose malabsorption. Patients with carbohydrate malabsorption were older and had poor glycemic control as compared with those without carbohydrate malabsorption. The HOMA value, the sum of serum insulin during the test and the AinsulinlAglucose ratio were greater in patients with carbohydrate malabsorption. CONCLUSION： Insulin resistance may be overestimated by using these markers if the patient has carbohydrate malabsorption, or that carbohydrate malabsorption may be present prior to the development of insulin resistance. Hence carbohydrate malabsorption should be taken into account for estimating insulin resistance and β-cell function.

关键词： 75-g OGTT Carbohydrate malabsorption Bacterial overgrowth Breath test Insulin resistance

Intra-Palm Propagation Signals as Suitable Biometrics for Successive Authentication

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Computer Technology and Application 2016年第2期7卷 65-72页

作者： Takashi Inada Yuuta Sodani Isao nakanishi Graduate School of Engineering Tottori University Tottori 680-8552 Japan

We propose the use of intra-palm propagation signals as biometrics. The intra-palm propagation signal is a signal that is propagated in the shallow part of the skin of a palm. In this paper, we prepare dedicated measuring devices and measure intra-palm propagation signals from twenty-one experimental subjects. We also evaluate the verification performance based on Euclidian distance or SVM （support vector machine）. The equal error rate in the case of SVM is aovroximatelv 24%.

关键词： Biometrics successive authentication intra-palm propagation signal support vector machine.

Fundamental Characteristics of Reduction System for Seismic Response using Friction Force

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Journal of Civil Engineering and Architecture 2011年第11期5卷 1042-1047页

作者： Katsumi Kurita Shigeru Aoki Yuuji nakanishi Tokyo Metropolitan College of Industrial Technology

A new device of reduction for seismic response using friction force was developed. In this paper, fundamental characteristics of reduction system for seismic response using this device were investigated by excitation experiment using artificial seismic waves. The peak acceleration amplitude on this system has decreased to about 50-90% over the input waves. Although a spectral peak around the frequency of 0.5Hz that is the natural period of this system was identified, the value of a spectral peak was decreased using bearings with the high friction force. This device is useful for reduction of seismic response.

关键词： Friction force seismic response natural period damping ratio amplitude.

Coronary Calcium Scoring in 2017

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Cardiovascular Innovations and Applications 2016年第B12期2卷 101-110页

作者： Kazuhiro Osawa Rine nakanishi Matthew Budoff Los Angeles Biomedical Research Institute at Harbor University of California-Los Angeles Los AngelesCAUSA

Coronary artery calcifi cation(CAC)is as an independent risk predictor of cardiovascular disease and can classify an individual’s risk of atherosclerotic cardiovascular disease,particularly in intermediate-risk ***,CAC progression is associated with greater rates of cardiovascular *** article provides available data and expert recommendations for CAC based on current *** focus on the utility of CAC for stratifi cation of individuals and describe its diagnostic value in identifying patients at *** also describe the important ability of CAC to derisk a patient with a score of zero.

关键词： coronary artery calcifi cation ASCVD risk