著者

佐藤 岳彦 土井 章子 落合 史朗 宮原 高志 藤岡 万也 ラマサミー ラズ 浦山 卓也 中谷 達行

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2005, pp.145-146, 2005

---

An atmospheric low temperature plasma flow using a coaxial cable for microwave transmission has been applied to sterilize Escherichia coli to investigate the relationship between gas temperature and sterilization rates. The plasma source mainly consists of a cavity, a quartz discharge tube, a coaxial cable, a microwave power source and a gas supply system. The sterilization rate shows 100% in the center region of plasma exposure when the exposure temperature is 333K. The rate is decreased in the outer region of the plasma exposure. The gas temperature distribution shows the same tendency of the sterilization rate. This implies that the gas temperature is one of sterilization indicators.

著者

佐藤 岳彦 土井 章子 西山 秀哉 藤岡 万也 ラマサミー ラズ 浦山 卓也 藤井 修逸

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2004, pp.57-58, 2004

---

A new type of atmospheric low temperature plasma source was developed utilizing a coaxial cable for microwave transmission rather than conventionally used waveguides. The plasma source has advantages such as portability, simple configuration, and ability to operate with wide range of gases and its mixtures. It mainly consists of a cavity, a quartz discharge tube, a coaxial cable, a microwave power source and a gas supply system. Using this plasma source, we tried to clarify sterilization characteristics of Bacillus subtilis. The log reduction numbers of Bacillus subtilis was obtained at least 5 (10^<-5>) under the following operation conditions: gas flow rates of Ar (14 SLM) with mixing oxygen of 0.5 SLM and input power is 400 W. Distributions of temperature and gas velocity were also measured two-dimensionally by using E-type thermocouple and Pilot tube, respectively. The temperature distributions and the peak value of temperature were influenced by the gas flow rate and the kinds of mixing gas. The effective sterilization is obtained under the condition of the substrate surface temperature of 353 K.

著者

北野 正典 中村 優一 PILT Kristjan 有本 英伸 角田 直人 山田 幸生

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2005, pp.61-62, 2005

---

Patients of kidney disease remove excess water by hemodialysis. In hemodialysis, blood pressure may fall and the patients may suffer from hypovolemic shock, because body fluid removal rate is normally larger than plasma refilling rate. The aim of our research is to measure water content in issue in order to prevent the hypovolemic shock and to know how much water has to be removed quantitatively. We employ a technique using near infrared spectroscopy for this purpose. It will have advantages of being real-time, noninvasive and continuous.

著者

久保 幸一 金元 敏明 御手洗 拡史

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2007, pp.355-356, 2007

---

The authors have invented the superior wind turbine generator, which is composed of the tandem wind rotors and the double rotational armature type generator without the conventional stator. The large-sized front wind rotor and the small-sized rear wind rotor drive respectively the inner and the outer armatures of the generator, in keeping the rotational torque counter-balanced. Such operating conditions enable to make the output higher than the conventional turbine and to keep the output constant in the rated operating mode without the brake and/or the pitch control mechanisms. This paper discusses mainly the effect of the wind rotor profile (camber and twist) on the diameter ratio and the axial distance between both wind rotors.

著者

金元 敏明 富田 雅樹 津田 洋介 福岡 佑樹

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2004, pp.153-154, 2004

---

This paper proposes the unique wind turbine system, which is composed of the tandem wind rotors and the peculiar generator with the inner and the outer rotors, and discusses the wonderful advantages of the system. The large-sized front wind rotor and the small-sized rear wind rotor drive respectively the inner and the outer rotors of the generator, in keeping the rotational torque counter-balancing. Such operating conditions enable to make the cut-in wind speed slower and to keep the frequency/output constant irrespective of the wind speed, without the conventional breaking and/or the pitch control mechanism.

著者

野畑 仁志 和田 豊 判澤 正久 遠山 文雄 学生ロケットプロジェクトチーム

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2005, pp.383-384, 2005

---

A hybrid rocket with new engine that had developed by students themselves was launched at 13:55 (JST) on 13th March 2005 at the Taiki-cho launch site, Hokkaido and the experiment was mostly successful. The rocket is 2.1m long, 10.2cm in diameter and 7.1kg in weight. Including payload instruments were non-gunpowder separation mechanism, telemeter, 3-axial accelerometer, altimeter, timer, flight computer and movie camera. Recovery parachute opened at 400m high and rocket system was safely recovered after 56 seconds after the launch. The new fuel of the engine was composed by microcrystalline wax and nitrous oxide which is safely and has high combustion efficiency. The wind direction and velocity were able to measure above 365m high from the ground, and student-tracking team tracked the rocket during the flight. In this paper, we report a result for rocket launches and our experimental experiences of rocket making and the management.

著者

中川 昭夫 笠 潮 宮部 洋介 井上 昭夫

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2000, pp.349-350, 2000

被引用文献数

3

---

Most of caster walkers don't have any brake mechanism. Some of them have hand grip type brake mechanisms but it is not easy for some of the users. For those users, it is desirable if there is a brake system which works only at a time of emergency like an occasion of falling down. Properties of homogeneous ER fluid is ideal because it doesn't show any shear force but it shows a large shear force when a high voltage is applied between a narrow gap but it requires a very small electric current. The caster walker equipped with the ER fluid brake was developed to increase safety of the users.

著者

井上 昭夫 笠 潮 宮部 洋介 中川 昭夫

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2000, pp.281-282, 2000

---

Properties of homogeneous ER fluid comprised of liquid crystalline polysiloxane (LCS) were described. The fluid shows Newtonian flow in an electric field and far larger ER effect than heterogeneous ER fluids of particles dispersion in oil. ER brake employed the LCS ER fluid was accomplished with many contrivances in the design and set up process for preventing a fluid leak and filling the fluid completely into a narrow electrode gap. The brake showed a large torque (brake power) with very small electric consumption. A caster walker with intelligent ER brake was developed for a practical use.

著者

小方 聡 廣瀬 敦 渡辺 敬三

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.1, pp.7-8, 2001

---

In order to clarify the relationship between the drag reduction and the fine grooves on the wall surface, we measured pressure losses of tap water in a pipe with new water-repellent wall. The pipe walls are different in terms of width, length and intensity of development of the grooves on its surfaces each other. The surfaces of those water-repellent walls are excellent in durability comparing to those of highly water-repellent walls, whose endurance is a serious problem of the practical use of this wall. The experimental result shows that the drag reduction does not occur for the test pipes. It can be considered that the size of the grooves is larger than that of the drag reducing highly water-repellent wall.

著者

大田 健

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2010, pp.25-26, 2010

---

The inorganic system glass coating film was developed as a painting protection film for the car. The glass film adds hydrophile and the resistance to ultraviolet rays to various materials. However, the functional evaluation of the glass film is difficult because the film thickness is about 20 nm. I tried the reflectivity measurement of existence and a characteristic of the glass film by the spectrophotometer. The glass film's reflectance has changed by the uv in about 10%. The glass film is expected that there is a characteristic of reflecting and scattering for the uv. In addition, I investigated the mechanism of coating the glass film. I made the electroplating system. I found the reflectivity change that the electroplating film is similar to the glass film. So, I found that boric acid silica has the electric-charge of the plus and the glass film is coated by the principle of electroplating.

著者

迫 洋介 吉村 英徳 三原 豊 石橋 賢樹 浜本 英利 福井 優

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2010, pp.173-174, 2010

---

A fabrication method of a painless transdermal micro needle array is proposed to realize its inexpensive and mass production. In order to avoid a risk by breakage of the needle when the needle is penetrated into the epidermis, the array is made with biodegradable polymer, for example, PLA. The proposed method has the following processes, (1) a mold dies having many micro through-holes is heated over the melting point of PLA, (2) the heated mold comes into contact with surface of the PLA plate, (3) the melted PLA is poured into the through-holes, and (4) the formed PLA plate is cooled to less than the melting point and removed from the dies. It is difficult to fabricate the array device because of the ratio of needle height to the diameter is large. So, heating temperature, time of heating the plate, moving stroke of dies and demolding temperature were examined and then fabrication of high precision circular cylindrical shaped needle array became possible.

著者

吉村 英徳 岡本 辰憲 濱本 英利 石橋 賢樹 小林 勝則 三原 豊

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2009, pp.109-110, 2009

---

A new fabrication method of a painless micro needle array for high reliable vaccine delivery system through a epidermis is proposed. This method has been developed to realize the inexpensive and mass production of the needle array. For safety against the break of the needle, the needle is made with biogradable polymer (PLA). The proposed method has the following processes, (1) Si tool in a shape of micro needle array is heated, (2) tops of the needles over the Si tool are touched onto the surface of the polymer plate to melt the contacting areas, and (3) the Si tool is detached from the plate to form the needles by elongating the melted polymer. In order to make the uniform needles over the plate, temperature, touching time, and withdrawing speed of the Si tool and tolerance of the polymer plate are examined. By the optimized working conditions, keen corn-type needles having the height of about 500μm can be formed enable to penetrate into the epidermis.

著者

齊藤 由貴 白鳥 敏正

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2010, pp.301-302, 2010

---

An experiment has been conducted to investigate static pressure fluctuation behind shock wave in self-excited shock wave oscillation phenomenon on 2D symmetrical circular-arc airfoil in internal transonic flow. Static pressure fluctuation was measured by high-response static pressure probe, and flow was visualized by Schlieren method. Experimental results show that static pressure fluctuation become smaller, as shock wave movement become smaller. In addition, concerning the phase delay of static pressure fluctuation behind shock wave, the overall trend is that the phase delay becomes larger, as the measured point leave for shock wave. When the shock wave form is saw tooth wave, phase delay trended to different from when the shock wave form is sine wave.

著者

緒方 正則 下間 頼一 塩津 宣子

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2007, pp.97-98, 2007

---

Up to the present, authors surveyed the cart ruts in ruins of the Greece age and the Rome age in Turkey. The places are the western coastal region around the Aegean Sea. Those investigated places were Perge, Hierapolis of Pamukkale, and Efes. The date was August, 1998. The wheels and the chassis of the carriages were mentioned in the investigation results. The carriages in various places by the field survey were thought to be used in the ancient times.

著者

Park Yuong Chul Park D. S. Lee Gyun Ghung 古屋 泰文

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.1, pp.347-348, 2001

---

Al alloy matrix composite with TiNi shape memory fibers as reinforcement has been fabricated by hot pressing to enhance the mechanical properties. The smartness of the composite is given due to the shape memory effect of the TiNi fiber which generates compressive residual stress in the matrix material when heated after being prestrained. It showed that the yield stress at 90℃ was higher than that of the room temperature. Especially, the tensile Strength of this composite increases with increasing amount of prestrain, and it also depends on the volume fraction of fiber and heat treatment. Comparison between theoretical estimation and experimental data showed almost good correlation by introducing non-linear FEM analysis.

著者

下間 頼一 緒方 正則

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2004, pp.409-410, 2004

---

Researching the origin of railway gauge of 4 ft 8.5 in (1435 mm), field survey has been done in Turkey, Central Asia, India, Pompei and Ercolanb of Roman ruins. In this report, Ostia Antica; ancient port of Roma, was surveyed. Many wheel ruts of Roman chariot were found and their gauges were measured. The measured results are nearly equal to present international railway standard gauge. Accordingly, the origin of railway gauge is in wheel rut of chariot at Roman Empire.

著者

島田 拓 臺丸谷 政志 小林 秀敏 藤木 裕行 シレガル ラクマド・アリフ

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2004, pp.193-194, 2004

---

This paper is concerned with the tensile strength and strain rate of concrete materials by means of the experimental method of reflected tensile stress waves. The experiment is conducted by the Hopkinson bar technique and it is based on the superposition and concentration of tensile stress waves reflected both from the free ends of a striking bar and a specimen bar. The impact tensile experiment for concrete materials was carried out and the tensile strength of concrete under impact loadings was discussed as well as the effect of strain rates. This study is focused on the measurement of strain rates using both strain gages and crack gages. It is found that the impact tensile strength of concrete is remarkably influenced by strain rates ranging from 10^0 to 10^2 sec^<-1>.

著者

渡邉 誠 熊谷 進 田口 收

出版者

一般社団法人 日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2007, pp.195-196, 2007

---

If a plastic eraser is placed in liquid nitrogen it will explode. The characteristics of explosion of the eraser were studied experimentally. The most probable cause of the explosion was cryopumping of a subsurface void. After boiling on the surface of the eraser, liquid nitrogen penetrates into the eraser and then flash evaporates in the subsurface void. A cryopumping model was proposed to capture the unique characteristics of the eraser frozen in liquid nitrogen.

著者

甕 紘介 中島 翔 菊池 俊紀 藤江 裕道

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2004, pp.143-144, 2004

---

The frictional characteristics of earthworms were determined using a 3D micro force plate developed in our laboratory. It was possible to measure the frictional force and vertical force applied to the force plate. Earthworms, named "Eisenia fetida" and "Pheretima hupeiensis" in Japanese, were used to determine their frictional behaviors when they moved on waterproof sand papers fixed to the force plate. The coefficient of static friction of Eisenia fetida against the sand papers were 6.9, 5.7, and 3.9, at the roughness of 2.98, 3.73, and 16.2 μm, respectively, with a significant difference (p<0.05) observed between the roughness of 2.98 and 16.2 μm. The coefficient of friction of Pheretima hupeiensis against the sand papers indicated a smilar trend as to Eisenia fetida, with a significant difference observed between the roughness of 2.98 and 16.2 μm. Note that the coefficient was significantly higher in Pheretima hupeiensis than in Eisenia fetida at the roughness of 2.98 μm. Mucous liquid secreted from earthworms was observed on the surface of the roughness of 2.98 and 3.73 μm after the friction test. Microscopic observation indicated that earthworms had many spikes called "seta" around their bodies and that they controlled the length of the seta during the movement on an irregular surface. These results indicate that earthworms control their frictional behavior in response to various surfaces that they contact by the use of their mucous liquid and seta They also indicate that the mucous liquid plays more important role than the seta in controlling the frictional behavior of earthworms in response to relatively smooth surfaces.

著者

近藤 義広 松下 伸二 森山 隆志 大橋 繁男

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2000, pp.171-172, 2000

---

We have developed a method of cooling high-power-density CPU modules within a bending duct. The method uses a jet-duct system made of an air duct and axial fans. This system has slit orifices upstream from the CPU modules. Pressure drops in this system are calculated as four values : wringing loss in the chamber, friction loss in the duct, extrusion loss from the duct, and wringing loss in the slit orifice. These loss values agree with the experimentally measured losses to within an error of ±10%. The calculation showed that when the duct width is small, the wringing loss in the chamber account for the major part of the total loss.