An electrohydrodynamic (EHD) micropump to generate oscillating flow is newly developed and experimentally tested. The size of the present EHD pump is 24×30×7.8mm. A pumping channel fabricated in this EHD pump is bended in parallel in order to extend the pumping channel. The channel has the dimensions of 24×48×0.9mm, in which ten pairs of electrodes are fabricated. The maximum static pressure generated by the present EHD pump is about 550 Pa at the input of dc 1 kV, and maximum flow-rate is 4.3 ml/min at unloaded condition. In order to generate symmetric oscillating flows, alternate voltage is applied. It is ascertained that the present EHD pump is successful in generating the symmetric oscillating flows at low frequencies (0.01 Hz〜0.05 Hz).

抄録全体を表示

A 'pneumatic servo bearing actuator (PSBA)' that consists of an aerostatic bearing and a servo valve was proposed and developed for ultraprecise positioning. In the actuator, pressurized air controlled by the servo valve moves an actuated spool ultra-precisely. Even under open-loop control, the PSBA had good repetition accuracy and positioning resolution on nanometer order. Applying simple position feedback and parallel observer that estimates the disturbance into the system increased the actuator's stiffness almost to be infinite and promoted the sharp step response without any drift and hysteresis.

抄録全体を表示

One of the potential problems of a microactuator for HDD tracking servo is its resonant motion excited by external disturbances such as air-flow. For a microactuator that uses PZT ceramic as a driving source, one can use the same PZT device as an actuation source as well as a force sensor. By using the sensed force, one can properly design a feed-back system and control the resonant behavior of the system (called active damping). The mechanical system was analyzed, and sensing circuit was designed. Feed-back controller was designed properly such that the resonant motion is damped. Experiment was carried out by using an HDD prototype, and it was demonstrated that the resonant motion caused by airflow was successfully damped, resulting in higher position accuracy of the read/write element

抄録全体を表示

We investigated the frictional properties and the durability of self-assembled double layers on Au using a pin-on-plate tribometer and X-ray photoelectron spectroscopy (XPS). We found that double layers made from octadecanethiol (ODT) and mercaptohexadecanoic acid (MHA) connected via Cu ions exhibited lower frictional coefficients (approximately 0.1-0.15) than that of ODT monolayer (〜0.2). The frictional properties of self-assembled monolayers (SAMs) covalently bonded to silicon (Si) substrates through Si-C or Si-O-C bonds were also investigated using the pin-on-plate tribometer. Three kinds of molecules, which were 1-hexadecene, 1-hexadecanol and octadecyltrichlorosilane, with different head groups were used. SAMs with the Si-C bond of the head group exhibited lower friction coefficients, higher wear resistance and higher durability than those with the Si-O-C bond. The head group of the molecules affected the friction properties of the modified surfaces of the SAMs.

抄録全体を表示

Nano-structure-based patterning of nanometer thick lubricant films is presented. Nanometer thick lubricant films can be patterned on the nanometer-scale using the oxide nano-structure fabricated by probe oxidation. We clarified that the lubricant distribution strongly depends on the shape of nano-structure.

抄録全体を表示

Superhydrophobic double roughening structure of DLC film was prepared by 2.45 GHz surface wave-excited plasma CVD with the mixture of methane (CH_4) and tetramethylsilane (TMS : Si(CH_3)_4) gases on the undulated DLC film by a series of plasma Ar etching, coating process and plasma Ar etching. Static wetting angle of water was observed that double roughening structure of DLC was superhydrophobicity such as wetting angle 161°. This approach also increased in air pockets easily trap among the needle-like posts. For the low friction at nanoscale, the surface wettability of the solid lubrication played a significant role, when the DLC film modified from flat to double roughening structure, the friction was constantly inner humidity conditions. Results generally showed that humidity had insignificant effect on the nanoscale friction at superhydrophobic DLC surface. The effect of the superhydrophobic double roughening DLC and friction were discussed with the following factors: the surface morphology affinity to needle shape, a reduction of the real area of contact, graphitization and easily occur to slip at small contact interface due to self-cleaning effect.

抄録全体を表示

The micro-nano technologies play important roles to realize novel devices in various fields. This paper focuses on the recent researches on MEMS and NEMS technologies in the optical and biological fields, and introduces our some activities in the fields.

抄録全体を表示

This paper describes a practical common design procedure for non-contact and contact mechanisms. To this date, many advanced controller design methods have been evaluated for high performance precision motion systems. However, their methods often produce complex structures and require much knowledge of characteristic of controlled objects and their control theories. This deteriorates the practicality of the methods. In order to overcome the problem, we have proposed and studied NCTF (Nominal characteristic trajectory following) controller design method for precision motion. In this paper, the NCTF controller design procedure which is applicable and totally independent of friction characteristic is discussed. The designed input signal for open-loop experiment which is needed to satisfy two important conditions is explained. The common design procedure of the NCTF controller and the designed input signal is verified experimentally by using non-contact [3] and contact mechanisms. The promising results of the positioning performance show the effectiveness of the proposed common design procedure and the usefulness of the designed input signal on the contact mechanism.

抄録全体を表示

This paper proposes a simple design and easy-to-implement PZT-actuated suspension for suppressing external and flow induced vibration. The advantage of this design is that the dimension and properties of the PZT material can be easily adjusted to optimize the performance and to fit an existing suspension. It is found that with this new PZT actuator design, several off-track vibration modes of the suspension can be suppressed significantly.

抄録全体を表示

This paper reports the lower cost mirror device composed of the inexpensive glass and the polymer material. This device is a new construction composed of the glass as the substrate and the polymer as the torsion bar. The polymer mirror containing the magnetic particles is used. The device can be fabricated only by the photolithography technology. We adopted the actuation system which attracts the mirror directly with the electromagnet. We fabricated the large-sized mirror (20mm×10mm) device of one axis deflection and evaluated the characteristics of the fabricated mirror device. Then, we confirmed the performance of large deflection angle which was larger compared with the conventional device in the deviation angle. As the result, we confirmed the possibility to realize the magnetic actuation type low cost polymer MEMS mirror.

抄録全体を表示

The authors have studied the new optical MEMS switch using a belt-shaped thin film mirror. This paper describes the reduction of the driving voltage of the optical switch. For the reduction, the thin film mirror and the high dielectric constant material were used and the suitable driving signal input was examined.

抄録全体を表示

We have developed a traveling small capsule, which has a smooth outer surface and is driven by inertia force and friction force. Measuring only 7 mm in diameter and 12 mm in length, it is sufficiently small to be placed in the human gullet or intestines. The capsule contains a small magnet and a coil, and an electric pulse drives the magnet to move the capsule. We performed an experimental investigation on making our capsule travel on a plastic material, which has similar elasticity characteristics to the living body. We also showed that it can travel on the surface of a pig's intestine. Our capsule may be useful for medical treatments such as inspection, drug delivery and operation.

抄録全体を表示

A new surface mount system that is composed of a lot of miniature manipulators has been proposed for system down-sizing and high speed. In this paper we developed surface mount system consists of new plastic miniature pantograph mechanism made of polypropylene and XY table, which can operate electric device 0603(0.6mm×0.3mm). And we evaluate the system. The surface mount system consists of surface mount machine to pick-and-place electric device and 2 DOF XY table to carry printed circuit board. The surface mount machine consists of the carrying function of injection pantograph mechanism and the function of suction-and-release electric device by vacuum pinset attached on the tip of the pantograph. And we made surface mount machine, 2 DOF XY table, and circuits to control the system as trial machine. We evaluated the trial surface mount system about positioning accuracy, velocity of placing, efficiency of placing and so on.

抄録全体を表示

MRI image guided intervention is now gradually spreading with the precise/plenty surgical information acquired from intra-operative MR images, however, surgeon encounters difficulties to obtain accurate "registration" between navigation results and operating devices, and it is almost impossible to perform operation inside the MRI scanner because of its narrow gantry space. To solve this problem, the introduction of novel technologies should be required for precise/safe surgical operations under MRI. In this key-note speech, we focus on our recent research works including MR image guided surgical robotics and the augmented reality system. Both are MR safe or MR conditional systems for use under the strong magnetic field.

抄録全体を表示

In order to solve the problem of lack of heart donors, ventricular assist devices have been developed and used as a bridge to transplant, a bridge to recovery or as destination therapy. Among these devices, maglev rotary pumps have been shown to deliver good clinical results with low blood damage, low risk for blood clot formation and high durability. In order to improve the magnetic bearing design, hydraulic forces acting on the maglev impeller should be precisely evaluated, however direct measurement is impossible due to absence of a rotor shaft. In this study, we propose using disturbance force observer in a two degrees-of-freedom radial controlled maglev centrifugal blood pump to estimate the radial hydraulic force acting on the maglev impeller. The radial dynamic characteristics of the maglev impeller change with flow conditions, so they were evaluated under different rotational speeds and flow resistances, and the radial disturbance force observers were designed based on the linear models obtained for a given rotational speed. Applying these observers at different rotational speeds and flow resistances, under continuous flow, we observed little variation of force direction with respect to rotational speed and proportionality between the force magnitude and the flow rate, being the maximum force 1.3 N for a flow rate of 6.8 L/min at 1700 min^<-1>. Under pulsatile flow, as in ventricular assistance, the estimated hydraulic forces followed the pulsatile flow oscillation at 60, 70 and 80 bpm, and the backflow could also be observed.

抄録全体を表示

We developed a commercial microarray scanning system with two-color fluorescence detection (Cy5 and Cy3) and high speed rotational mechanism, loading 8 typical chip slides simultaneously. The proposed optical scanner based on a modified DVD optical pick-up uses two laser diodes of 650 nm (red) and 532 nm (green) wavelengths for the detection of Cy5 and Cy3 fluorescent dyes, In the scanning system, laser beams are used for both dynamic auto-focusing and exciting Cy5 or Cy3 dye, and PMT detects fluorescent light emitted from DNA markers spotted on a slide glass. We have also designed a novel rotational mechanism loading 8 biochip slides for high speed detection. The real-time focusing actuation and rotational mechanism enables fast scanning response, high accuracy and sensitivity with compact size by simple structure, which are superior to conventional microarray detection systems of the expensive mechanism. The performance of fluorescence biochip scanner is inspected by experiments using various commercial DNA chips such as BAC(bacterial artifical chromosome) oligonucleotide chip, HPV(Human Papiloma Virus) genotyping chip and scanner calibration slide chip(Full moon biosystems), etc.

抄録全体を表示

Much research on the development of a robotic capsule and micro robot for the diagnosis of gastrointestinal diseases has been carried out. The powering of these micro systems is becoming very important as the implementation of such systems is limited due to existence of on-board power supplies. This paper presents a micro robotic system based on magnetic principles to eliminate the use of on-board power supplies. The goal is to build a system in which a capsule-robot can be manipulated wirelessly inside human's body. A micro robot (capsule robot) can be remotely operated with 3 DOF in an enclosed environment by transferring magnetic energy and electromagnetic waves.

抄録全体を表示

Continuous monitoring of eating habits could be useful in preventing lifestyle diseases such as the metabolic syndrome. Conventional methods consist in self-reporting and mastication frequency calculation from the myoelectric potential of the masseter muscle, both resulting in a significant burden for the user. We developed a non-invasive wearable sensing system that can record eating habits over a long period of time in daily life. Our original sensing system is composed by two bone conduction microphones placed in the ears, from which inside-body sound data are collected to a portable IC recorder. Applying frequency spectrum analysis on collected sound data, we could not only count the number of mastication during eating, but also accurately differentiate eating, drinking, and speaking activities, which can be used to evaluate the regularity of meals. Moreover, we found it is possible to classify types of foods eaten regarding their texture, from analysis of sound features value.

抄録全体を表示

Continuous monitoring of blood pressure in daily life could improve early detection of cardiovascular disorders, as well as promoting healthcare. Conventional ambulatory blood pressure monitoring (ABPM) equipment can measure blood pressure at regular intervals for 24 hours, but is limited by long measuring time, low sampling rate, and constrained measuring posture. In this paper, we demonstrate a new method for continuous real-time measurement of blood pressure during daily activities. Our method is based on blood pressure estimation from Pulse Wave Velocity (PWV) calculation, which formula we improved to take into account changes in the inner diameter of blood vessels. Blood pressure estimation results using our new method showed a greater precision of measured data during exercise, and a better accuracy than the conventional PWV method.

抄録全体を表示

This study proposed a prototype of handy instrument for quantitative assessment of the patellar tendon reflex (PTR) responses in clinical practice. Focusing on kinematic features of PTR, an integrated limb-mounted equipment was developed utilizing a multi-axis inertial sensor, data logger, and miniature tap force sensor. To identify characteristics of PTR, relationships between tendon tap force and kicking movement of lower leg were investigated. Additionally, a simple rigid body physical model was introduced to estimate knee extension torque as a consequence of the stretch reflex. Frequency domain system identification was then applied to describe dynamic responses of the PTR. Usability and consistency of the handy equipment was examined in the experiment with a healthy adult subject. The results suggested that the proposed handy instruments consistently quantified features of PTR, which was feasibly characterized by a few simple mechanical parameters.

抄録全体を表示

The aim of this study is to propose the measurement method of three-dimensional (3D) movement of forearm and upper arm during pitching motion of baseball using inertial sensors without serious consideration of sensor installation. Although high accuracy measurement of sports motion is achieved by optical motion capture system at present, it has some disadvantages such as the calibration of cameras. Whereas the proposed method for 3D measurement of pitching motion using body mounted sensors provides trajectory and angle of forearm and upper arm by the integration of acceleration and angular velocity measured on upper limb. The experimental results show that 3D location of shoulder, elbow and wrist estimated by the proposed method corresponds to that measured by the optical motion capture system.

抄録全体を表示

HDD flex cable vibrations are examined in this paper with focus given to dynamic contributions from boundary geometrical tolerances at flex cable's two ends. Analytical vibrations modeling considering servo effects and experimental arrival PES measurements are presented in this paper to identify the key controlling tolerance. It is found the key tolerance that controls the flex cable vibrations is the J-block position and geometrical tolerances.

抄録全体を表示

In this paper, we investigate flow field and particle behavior in hard disk drives (HDDs) by means of the voxel simulation method and the particle simulation method. The particle distribution is shown to depend on the particle diameter, for example, the heavier particles flies at the outer diameter region of the disks. We also show that the filter performance depends on the filter position and the particle trajectories to the filter show different characteristics in accordance with the filter position.

抄録全体を表示

In this paper, we measured frequency response functions of 1.8-in hard disk drives (HDD) from 5 to 70 degrees Celsius. After extensive studies, we find that several critical steps must be taken to secure good experimental results. First, the fixture must be designed to reduce thermal stresses. It can be done via a better clamping design of the fixture or a reduction of mismatch of coefficient of thermal expansion between the fixture and the HDD. Second, environmental noise may come from traffic noise or from fixture connectivity, which range from 20-200 Hz and 1-20 Hz, respectively. Isolation of the environmental noise will significantly improve the experimental measurements from 1-200 Hz.

抄録全体を表示

The frequency dependency of airflow excitation causing disk flutter of hard disk drives was experimentally investigated. The frequency spectra of the disk vibration of 19 drives were measured with a laser Doppler vibrometer, and then natural frequencies, modal damping ratios, and root mean square (RMS) values of the vibrations associated with the disk modes were calculated. Moreover, the pressure fluctuation exciting each disk mode was estimated from the theoretical RMS value and vibration characteristics of the disk mode. Multiple regression analysis was performed as the independent variables were the circumferential velocity and the natural frequency and the dependent variable was the pressure fluctuation. As the results, the relationship that airflow excitation causing disk flutter is proportional to the inverse of the frequency and the square of the disk speed was confirmed to be statistically significant at a 5% significance level. In addition, the relationship between disk flutter amplitude and disk properties was derived.

抄録全体を表示

This paper studies airflow induced vibro-acoustics of HDD numerically and experimentally. The noise contribution from airflow is characterized and investigated through sound power measurements in a full anechoic chamber. A methodology is developed to simulate airflow induced noise for acoustic optimization of future products.

抄録全体を表示

Recent hard disk drives with higher track density need countermeasures for flow-induced vibration (FIV) such as disk and arm vibrations without increasing the power consumption. The authors propose a new spoiler, "window spoiler", the wings of which each has a large hole and the same outer size as the original spoiler. This paper describes how a window spoiler can reduce FIV, better than the spoiler without a hole. The reduction mechanism was clarified by using particle image velocimetry.

抄録全体を表示

This paper investigates the thermal performances of a helium-filled enterprise disk drive through FEM simulations with experimental validation. Temperature distributions and thermal deformations of a helium-filled commercial enterprise HDD have been examined. The results show a 40-50% reduction of temperature rise for a helium-filled HDD enclosure comparing with air-filled HDD. This reduction can decrease off-track thermal deformations and hence improve R/W head performance, lifetime and reliability of enterprise HDDs

抄録全体を表示

We describe the development of new nozzle for continuous inkjet printers. We designed the shape of its orifices using a robust design method, and next we decided the best production method. This method consists of drilling steps and a punching step. We fabricated a nozzle with the accuracy of 1μm or less in diameter. We confirmed that the new nozzle can be used for more than 10,000 hours.

抄録全体を表示

The goal of this study is to fabricate precise three Dimensional cell structures utilizing the electrostatic injection phenomena. We have been applying the injection for patterning living cells. We fabricated living cell structures those were dot, line and wall. For fabricating precise 3D living cell structures, it is important to investigate fundamental characteristics of patterning gelatin by using the electrostatic injection because gelatin is a binder between cells. In this paper, we patterned dots and lines of liquid with gelatin utilizing the electrostatic injection.

抄録全体を表示

Applying micro spray of electrostatic inkjet for precision film coating was examined experimentally. At first, the jetting states of two viscous solutions were observed to determine coating parameters. Then, with those parameters examined, the surface quality of coated films was evaluated through several coating tests. According to the increment of applied voltage, jetting mode was varied from dripping, to jetting. The most favorable condition for coating was the stable cone jet mode in the jetting mode, where a well-oriented thread was jetted from the stable Taylor Cone at the nozzle tip and broken up into mist during flight.

抄録全体を表示

In the development process of the electro photographic system, a motion of development particle is controlled by electromagnetically to produce the image, and the electromagnetic interactions act between the particles. Therefore, to analyze behavior of particles under the interactions provides useful information for design of multi functional printer with high quality. The simulation method with discrete element method (DEM) algorithm is an important numerical technique to analyze the relation between motion of each particle and the design condition in the development process. Since the DEM algorism calculates equations of motion for all particles, it spends much computing time. Especially in a large number of particles system, the electromagnetic interactions between particles become complicated, it is difficult to perform the calculation within short time. To overcome this difficulty, parallel algorism was introduced to DEM, they did not achieve enough parallel performance for practical use [1]. In this study, the force decomposition method is introduced to DEM as parallel technique to realize high scalable parallel efficiency [2, 3, 4].

抄録全体を表示

Vibrations during scanning and failure to perfectly track nominal scan velocity affect the quality of the scanned image. To address these issues, this work proposes a novel control scheme which utilizes two well-known control strategies for synthesizing a velocity profile. Time optimal input shaping is used to reduce overshoot and minimize move time in the transient region of the scanhead velocity profile. A single trial convergent iterative learning control scheme is used to reduce color registration errors by compensating for velocity fluctuations in the constant speed portion of the motion. Experimental results demonstrate the effectiveness of the proposed approach in minimizing overshoots in ramp up velocity transient as well as color registration errors on scanned image.

抄録全体を表示

Printer identification based on a printed document can provide forensic information to protect copyright and verify authenticity. In addition to intrinsic features (intrinsic signatures) of the printer, modulating the printing process to embed specific features (extrinsic signatures) will further extend the encoding capacity and decoding accuracy. In this paper, we will demonstrate the feasibility of embedding code sequences in EP halftone images by modulating dot sizes through laser intensity modulation. A communication channel model incorporating the impact of the process modulation parameter, e.g. laser intensity, with a stochastic dot interaction model and scanner modulation transfer function (MTF) to estimate the impact of the modulation on a known halftone pattern and detection performance is developed. This model can be used to exam the embedding and detection algorithm and select embedding parameters without extensive measurements.

抄録全体を表示

Recent developments in the application of simulation technologies to phenomena at various scales in a hierarchy during the intellectual design of industrial products are reviewed. An intelligent-design-related problem is described and a potential solution is mentioned.

抄録全体を表示

Hydraulic fluids of new concept, oily high bulk modulus fluids, have been developed. The new fluids are expected to improve hydraulic system performances. Response speed of hydraulic pressure attributing to fluid molecules' movement was tried to simulate by MD.

抄録全体を表示

For crankshaft bearings of automotive engines, conformability against crankshaft is one of the most important performances. In order to keep good conformability, the bearing surfaces are often coated with soft materials. To analyze elastic-plastic deformation problems of the coating under the condition of local contact points, a new technique of numerical simulation by particle method has been developed. By using the particle method, it is clarified that coating's elastic-plastic deformation influences friction force and depends on the material parameters.

抄録全体を表示

Present product includes very small designed structure. The very small designed structure directly influences the property and the shape of product. It is important for product designer or material designer to get overview and forecast of the property of designing product or material. In order to make multi-scale product design and multi-scale engineering simulation of designing product or material, a framework of multi-scale product design and simulation system is proposed. Multi-scale product design and simulation system consists of multi-scale spatial model and multi-scale simulation modules. Multi-scale spatial model is an interface for multi-scale simulation modules, and a bridge between micro scale level simulation and macro scale level (human scale level) simulation.

抄録全体を表示

Inelastic deformation of gold (Au) atomic cluster is investigated by using molecular dynamics (MD) simulations. We performed compression and unloading tests in which silicon (Si) plates approach each other and push single Au cluster of 4 nm diameter in between. Possibility of super-elastic (hyper-elastic) behavior is discussed in the present study, because the cluster in MD simulation certainly shows large reversible strain in unloading process after compression. The strength of interaction between Si plate and the Au cluster is adjusted to our AFM experiment. Softening in elastic constant by increase of temperature is also discussed.

抄録全体を表示

The mechanism of superlubricity of the fullerene bearings is numerically studied using molecular mechanics simulations. First the superlubricity along the [101^^-0] direction of the graphite/C_<60>/graphite interface is discussed. It is clarified that the C_<60> bearing system has the lower friction coefficient and the lower lateral stiffness than the graphite system along [101^^-0] direction, which ascribes to the C_<60> rotation and the elastic contact at the C_<60>/graphite interface. Next we have found the marked anisotoropy of the superlubricity of this system with the periodicity of 60 deg.

抄録全体を表示

Superlubric state was found in a molecular dynamic simulation study of incommensurate Frenkel-Kontorova model. This finding was supported by an experimental study with ultra-high vacuum scanning tunneling microscopy. Recently, superlubric state was experimentally found in friction of tungsten tip sliding on graphite in ambient laboratory air. Since there are likely to be some impurities at the frictional interface in this experiment, the experimental result indicates that the superlubric state is stable against contaminations of impurities. Here we examined this indication by performing a molecular dynamic simulation study of incommensurate Frenkel-Kontorova model with impurities. In case of attractive impurities, the impurities were placed at the peaks of the sinusoidal substrate potential; in case of repulsive ones, they were placed at the bottoms. The concentration of the impurities was set to be 1/1500. The interaction potential between the impurities and the sliding atoms was expressed by Gaussian function. The strength of the interaction was varied from 1 to 3 times of the amplitude of the sinusoidal substrate potential. For each value of the strength of the impurities, motions of the sliding atoms were observed for various initial velocities and amplitudes of the substrate potential. Observing the sliding motions, friction diagrams, which show where in the parameter space friction and superlubric states are, were constructed. If the velocity of the center of mass of the sliding crystal decreased, the sliding motion was defined to be in frictional state. If the center of mass velocity did not decrease, the sliding motion was defined to be in superlubric state. The obtained friction diagrams showed that if the interaction strength between the impurities and the sliding atoms was smaller than 3 times of the amplitude of the substrate potential, the friction diagram remained unchanged. Hence, the superlubric state was shown to be stable against the weak impurities.

抄録全体を表示

For analysis of kinetic friction between solids on the atomic scale, a solid surface model that consists of a coupled oscillator with a semi-infinite thickness is developed by Green's function scheme. The approach shows that friction depends on not only surface atoms and their interaction, but also bulk atoms in a solid. Energy transfer from kinetic energy of a sliding solid to low-frequency lattice vibration occurs in the presence of bulk atoms, and energy dissipation into the bulk system leads to friction.

抄録全体を表示

Molecular dynamics simulations are used to study the dynamic behavior of confined water molecules on hydrophilic and hydrophobic silicon surfaces under a shear condition. The dynamically stable structure of the hydrogen bond network on the hydrophilic surface is found which is related to the low friction of the DLC-Si coating.

抄録全体を表示

The effect of masked UV irradiation on distribution of monolayer polar lubricant films over solid surfaces was investigated by molecular dynamics simulations. Consistent with experimental results, the simulation results showed that masked UV irradiation induces a patterned surface structure with thicker lubricant in the irradiated area than in the non-irradiated area. Such structure was caused by the stretch of the lubricant molecules in the film thickness direction following the increase of molecule density in the irradiated area.

抄録全体を表示

Particle based numerical simulation was carried out to investigate the dynamic behavior of the meniscus bridge. The growth process of a meniscus bridge is numerically simulated. The process in the numerical simulation agrees qualitatively with experimental snapshots. But the simulation finishes growth much faster than experiment. In simulation, we use the static contact angle model. This model causes an unnatural curve at the beginning of the growth. It is found that the contact angle plays an important role in the dynamic process of the meniscus bridge formation.

抄録全体を表示

A new computational chemistry approach has been developed and improved for the viscosity prediction of liquids that based on the "Falling-ball" principles using classical molecular dynamics method. Calculated viscosities showed good agreement with experimentally reported values. The developed method was proved to be an effective tool for evaluating viscosity of complex liquids.

抄録全体を表示