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Post Operative Sensorineural Hearing Loss Following Middle Ear Surgery—A Study of 100 Cases

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International Journal of Otolaryngology and Head & Neck Surgery 2018年第3期7卷 67-74页

作者： Antony Abraham Paulose Ajeet Kumar nishi sonkhya Department of Otorhinolaryngology & Head and Neck Surgery SMS Medical College & Hospital Jaipur Rajasthan India

Background: Drill and surgical tools can cause noise induced hearing loss when used on or adjacent to the ossicular chain and stapes footplate or while working on the mastoid bone. Therefore the drill generated noise has been incriminated as a cause of sensorineural hearing loss in the operated ear. Objective: This study has been undertaken to estimate the proportion of sensorineural hearing loss following middle ear surgery and to assess the bone conduction thresholds of operated ear following middle ear surgery at different follow up periods. Methods: 100 cases of chronic suppurative otitis media posted for middle ear exploration surgery were included in the study. Results: Sensorineural hearing loss was present in 3 cases out of 100 cases (3%) after undergoing mastoid surgery. There was a mean increase in bone conduction thresholds of 0.75 dB at 500 Hz, 1.4 dB at 1 kHz, 1.7 dB at 2 kHz and 2.7 dB at 4 kHz at 6th month of follow up period after surgery with statistical significance at 2 kHz (p = 0.011) and 4 kHz (p Conclusion: Post mastoidectomy hearing loss is of high frequency in nature.

关键词： Chronic Otitis Media Mastoidectomy Drill Induced Acoustic Trauma SNHL

Primary Histoplasmosis of Larynx: A Case Series and Review of Literature

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International Journal of Otolaryngology and Head & Neck Surgery 2013年第2期2卷 47-51页

作者： nishi sonkhya Raghav Mehta Divij sonkhya Shubha Gupta Mansi Faujdar Department of Ear Nose and Throat N.K.P. Salve Institute & Lata Mangeshker Hospital Jaipur India Department of Ear Nose and Throat S.M.S. Medical College and Hospital Jaipur India S.D.M. Hospital Jaipur India

Objective: Aim of the study was to analyze 10 managed cases of Primary Histoplasmosis of Larynx, over a period of 10 years. Design: Retrospective, non-randomized, interventional case series. Patients and Method: This study was conducted in the Department of Otorhinolaryngology S.M.S Medical College from 2002 to 2011. The study consisted of evaluation of self-reported and referred patients who presented to ENT OPD and emergency. In all the cases a detailed history and clinical examination was done. All the patients underwent fiber optic laryngoscopy and subsequent direct laryngoscopy and biopsy. CT Scans were obtained for few cases. The study was a retrospective analysis of 10 treated cases. Main Outcome and Measures: Success of the treatment was defined as resolution of symptoms, differ-entiation from malignancy, no recurrence and regular follow up. Result: A total of 10 cases were managed between 2002 and 2011 and were reviewed. The main presentation was hoarseness of voice, with lesion simulating malignancy. Most common site of involvement was false cord and aryepiglottic fold (6 cases). Primary laryngeal Histoplasmosis was essentially a disease of adult males in all 10 cases. Treatment was exclusively medical with use of Itraconazole as drug of choice in 7 cases. Conclusion: Isolated laryngeal Histoplasmosis is a rare entity. Because of its simulation with malignancy it needs to be included in the differential diagnosis of neoplasm both benign and malignant. Our study clearly limits this kind of disease to adult males most commonly involving false cord and aryepiglottic fold in an endophytic pattern. Though it looks like cancer;biopsy confirms the diagnosis. The treatment is mainly medical with Itraconazole being the drug of choice.

关键词： Laryngeal Histoplasmosis Histoplasma Capsulatum Laryngeal Malignancy

A novel shaft-less double suction mini pump

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Science China(Technological Sciences) 2010年第1期53卷 105-110页

作者： nishi Michihiro Kyushu Institute of Technology Sensui-cho 1TobataKitakyushu 804-8550Japan

A novel double suction shaft-less mini pump was developed for heat control of small energy systems in this *** mini pump impeller with an exit diameter of 40 mm was combined with the motor rotor supported by the hybrid dynamic *** specific speed of the pump was 125 min-1 m3 min-1 *** hydraulic performance of the pump was investigated experimen-tally under four rotational *** the test results,it was recognized that the pump could provide a flow discharge of 5 L/min and head of 1.5 m,which are applicable for the heat control system of a 3 kW fuel cell.A three-dimensional turbulent flow simulation in the pump was also conducted near the design *** numerical results showed that the average hydraulic performance of the mini pump was predicted *** the internal flow simulation,it was revealed that the favorable inflow condition upstream of impeller inlet could be attained by applying the double suction shaft-less design for the mini pump.

关键词： double suction seal-less shaft-less uniform inflow mini pump

ELASTOMERIC SEISMIC-PROTECTION ISOLATORS FOR BUILDINGS AND BRIDGES

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Chinese Journal of Polymer Science 2013年第1期31卷 50-57页

作者： Toshio nishi Nobuo Murota International Division Tokyo Institute of Technology Department of Seismic Isolation &Vibration Control Development

A giant earthquake of magnitude 9.0 occurred in Pacific Ocean off of Tohoku District Japan on March 11,2011. The highest seismic intensity of 7 in JMA scale was recorded in Miyagi. In the Tohoku district, around 230 buildings are seismically isolated （hereafter, SI） mainly by elastomeric isolators （seismic rubber bearings）. According to the official survey reports by several organizations （for example）, the records of those buildings have verified the effectiveness of the seismic isolation. The response acceleration of the SI buildings was reduced by 30% to 50% of the input ground acceleration. Additionally, the difference of the conditions inside the room between SI and the fixed-base buildings was obvious as well as the damage in main structures of the buildings. The displacements of the isolators by the earthquake were around 200 mm according to the records of the instruments. As a result, the performance of SI buildings and the elastomeric isolators in the Tohoku District -- Off the Pacific Ocean Earthquake 2011 were excellent, and the efficiency of the seismic isolation was verified by the records of many buildings in wide area.

关键词： Elastomeric isolator Seismic isolation Rubber bearing.

Study on Performance and Flow Field of an Undershot Cross-Flow Water Turbine Comprising Different Number of Blades

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Journal of Thermal Science 2017年第5期26卷 413-430页

作者： Yasuyuki nishi Kentaro Hatano Terumi Inagaki Department of Mechanical Engineering Ibaraki University 4-12-1 Nakanarusawa-cho Hitachi-shi Ibaraki 316-8511JAPAN Graduate School of Science and Engineering Ibaraki University 4-12-1 Nakanarusawa-cho Hitachi-shi Ibaraki316-8511 JAPAN

Recently, small hydroelectric generators have gained attention as a further development in water turbine technology for ultra low head drops in open channels. The authors have evaluated the application of cross-flow water turbines in open channels as an undershot type after removing the casings and guide vanes to substantially simplify these water turbines. However, because undershot cross-flow water turbines are designed on the basis of cross-flow water turbine runners used in typical pipelines, it remains unclear whether the number of blades has an effect on the performance or flow fields. Thus, in this research, experiments and numerical analyses are employed to study the performance and flow fields of undershot cross-flow water turbines with varying number of blades. The findings show that the turbine output and torque are lower, the fluctuation is significantly higher, and the turbine efficiency is higher for runners with 8 blades as opposed to those with 24 blades.

关键词： Water Turbine Cross-Flow Turbine Free Surface Performance Flow Field Number of Blades

Study on the Rotor Design Method for a Small Propeller-Type Wind Turbine

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Journal of Thermal Science 2016年第4期25卷 355-362页

作者： Yasuyuki nishi Yusuke Yamashita Terumi Inagaki Department of Mechanical Engineering Ibaraki University Graduate School of Science and Engineering Ibaraki University

Small propeller-type wind turbines have a low Reynolds number,limiting the number of usable airfoil ***,their design method is not sufBciently established,and their performance is often *** ultimate goal of this research is to establish high-performance design guidelines and design methods for small propeller-type wind *** that end,we designed two rotors:Rotor A,based on the rotor optimum design method from the blade element momentum theory,and Rotor B,in which the chord length of the tip is extended and the chord length distribution is *** examined performance characteristics and flow fields of the two rotors through wind tunnel experiments and numerical *** results revealed that the maximum output tip speed ratio of Rotor B shifted lower than that of Rotor A,but the maximum output coefficient increased by approximately 38.7%.Rotors A and B experienced a large-scale separation on the hub side,which extended to the mean in Rotor *** difference in separation had an impact on the significant decrease in Rotor A's output compared to the design value and the increase in Rotor B's output compared to Rotor A.

关键词： Wind Turbine Propeller-Type Horizontal Axis Blade Element Momentum Theory Rotor Design Method

STRUCTURE AND DYNAMICS OF POLYMERIC MATERIALS IN NANO-SCALE

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Chinese Journal of Polymer Science 2011年第1期29卷 43-52页

作者： Toshio nishi So Fujinami Ken Nakajima WPI Advanced Institute for Materials Research Tohoku University

The nano-palpation technique, i.e., nanometer-scale elastic and viscoelastic measurements based on atomic force microscope, is introduced. It is demonstrated to be very useful in analyzing nanometer-scale materials properties for the surfaces and interfaces of various types of soft materials. It enables us to obtain not only structural information but also mechanical information about a material at the same place and at the same time.

关键词： Nano-palpation Atomic force microscope Soft material Young's modulus Viscoelasticity.

NUMERICAL STUDY OF FLOW IN CONICAL DIFFUSER WITH VORTEX GENERATOR JETS

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Chinese Journal of Mechanical Engineering 2007年第1期20卷 5-9页

作者： LIU Xiaomin nishi Michihiro School of Energy and Power Engineering Xi＇ an Jiaotong University xi’an 710049 China Mechanical Engineering Department Kyushu Institute of Technology Kitakyushu 804-8550 Japan

To develop vortex generator jet （VGJ） method for flow control, the turbulence flow in a 14° conical diffuser with and without vortex generator jets are simulated by solving Navier-Stokes equations with k-ε turbulence model. The diffuser performance, based on different velocity ratio （ratio of the jet speed to the mainstream velocity）, is investigated and compared with the experimental study. On the basis of the flow characteristics using computation fluid dynamics （CFD） method observed in the conical diffuser and the downstream development of the longitudinal vortices, attempt is made to correlate the pressure recovery coefficient with the behavior of vortices produced by vortex generator jets.

关键词： Vortex generator jet (VGJ) Flow control Longitudinal vortex Numerical simulation

Approach to reducing the effect of bone-coal power station on radiation environment

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Nuclear Science and Techniques 2002年第4期13卷 264-269页

作者： nishi－Ying GUPei－Long 等 StateEnvironmentalProtectionAdministrationRadiationEnvironmentalMonitoringTechnicalCenter Hangzhou310012 StateEnvironmentalProtectionAdministrationRadiationEnvironmentalMonitoringTech

The effect of two bone-coal power stations(6MWe) on environment was investigated within the scope of the dose contribution caused by various radionucildes in different *** is found that the best measures to reduce the effect of bone-coal power station on radiation environment include to select a fine boiler system and a comprehensive utilization of the bone-coal cinder(BCC),soot and ash in the catchers.

关键词：天然燃料骨炭粉末站辐射环境