Abstract : Tri Auto ZX2 can be used for patency and glide path according to the manufacturer's instruction manual. However, no reports have verified these details. This study examined whether Tri Auto ZX2 can achieve patency and a glide path.

 The orifice of extracted human premolars was enlarged using #35. 08 EndoWave. Patency and glide path were prepared using OGP mode 180°, 300rpm in Tri Auto ZX2.

Group 1 : Patency was possible with D-

#10, but not with D- #15. EndoWave MGP #15 was used for the glide path.

Group 2 : Patency was possible with D-

#10, but not with D- #15. Superfile #15 was used for the glide path.

Group 3 : Patency was not possible with D-

#10 or #15. EndoWave MGP #10 was used for patency.

Group 4 : Patency was not possible with D-

#10 or #15. Superfile #10 was used for patency.

 A glide path could be prepared in all root canals in groups 1 and 2. Patency was possible in 49.1% of root canals in group 3 using Endowave MGP#10 with Tri Auto ZX2 OGP mode. Patency was possible in 68.7% of root canals in group 4 using superfile #10 with Tri Auto ZX2 OGP mode. 31.3% of stainless-steel files in group 4 broke when using OGP mode.

 It is suggested that Tri Auto ZX2 is a good motor for achieving patency and glide path after negotiation using D-

#10.

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A gas in a tube spontaneously oscillates when the temperature ratio between the tube ends exceeds a critical value. This spontaneous gas oscillation is applied to a liquid helium level . In the present study, to design a liquid nitrogen level using spontaneous gas oscillation, the critical value of the temperature ratio causing spontaneous gas oscillation for the case of nitrogen gas was numerically investigated. It was found that a tube in which an array of narrow circular tubes is located can work as a liquid nitrogen level . Hence, a tube with an array of narrow tubes was constructed and the liquid level of nitrogen put into a vessel was measured with the constructed tube. The measurements also demonstrated that the tube can work as a liquid nitrogen level .

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If the survey is made by the 200kc echo-sounder with sharp beam, the almost true shape of sea bottom is obtained within the error of 4% for the slope of bottom of 50° and 1% for 20°. We made survey by the 200kc fish- at the fishing-ground off Sanno, Odawara City on occasion of late. The difference, between the survey map by the 200kc fish- and that by the 14.5kc fish- the beam of which is not so sharp, is clear at the station where the shape of sea-bottom is complicated. The former is much more detailed and shows more closely the depth obtained by fisherman's experience than the latter. And the survey is easier by 200kc than by 14.5kc.

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In this study a color 3-D range operating at the video rate has been developed for the purposes of industrial and welfare application. The range with simplified circuits discriminated eight colors through classifying the R, G, B signals from binocular cameras into high and low brightness levels. The corresponding color boundaries were determined by comparing binarized brightness levels, thereby enabling the derivation of an accurate parallax signal. This was applied to three-dimensional measurements of distances and dimensions. The influence of color combinations on the distance acquisition rate was examined. The results showed that the is useful as a practical device.

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We realize we've misplaced our keys and are frustrated by a massive search of the house. This paper develops a simple IoT-based key discovery method that uses a NodeMCU, a buzzer, and a battery. The method involved creating a key management method designed for key installation and developing a website to assist with key location. With her Google Chrome browser on the user's mobile phone, she can pinpoint the location of the lost key. When the website presses the key search button, it will play an IoT key-related beep and save time by streamlining the process. If you misplace your keys, you may search all over the house, but in the end, you may not be able to find them. This paper is extremely important in that it has developed a method for quickly finding keys using the method described above.

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The writers have already published (1967) a study on the efficiency of the vertical fish used in the Northern Pacific salmon fishing grounds in regard to the sigle fish image constituted by a single fish image of Alaska pollack, but not by that of salmon and trout. So we carried out experiments for the purpose of developing a salmon fish . The performance of fish for salmon, having a frequency of 28 KHZ, is as follows:
1. The results of various experiments by the present writers as well as by others, prove that the swimming layer of salmon at daytime, and also at nighttime, is not more than 50m in depth. So the detection layer need not necessarily cover deeper than 50m in depth.
2. The reason why on salmon image appear with the use of the vertical fish may perhaps be due to the fact that the salmon run away as the fishing boats approach, thus slipping out of the sound beam of the fish . The direction of the sound beams of our new salmon fish , manufactured for trial purposes, can be transmitted towards the ship side downward at 30° oblique.
3. In order to separate the image of salmon from that of Alaska pollack, we attached a special circuit (fish discriminating circuit) to let the smaller reflection level of Alaska pollack cut off because of its smaller size compared with that of salmon, and also a logarithm amplifier to supplement a propagation attenuation of ultrasonic waves by distance.
The results of such experiments proved a close correlation between the number of a single fish image as recorded by the net setting and the number of salmons caught by the gill net next morning. The recorded single image of fish is reasonably identified to be that of salmon.

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The authors have developed a new type laser range , which enables a mobile robot to measure the distance to a natural object located one to five meters ahead with an error less than two percents. The system uses laser as weak as 1[mW], a safe level for human eyes, and is workable under bright daytime sunlight of about 100, 000[lx]. This laser range can quickly process data while compensating the motional error induced by the robot on which it is mounted and makes real time measurements of objects located ahead.
This laser range is featured by plural redundant range measuring systems and a newly introduced real time signal processing technique of the redundant signals. The laser range shows strong noise reduction characteristic by acting together with two conventional methods, namely, conventional optical filtering which preliminarily eliminates noise and the DDD signal processing proposed by the authors for separating reflected pulseform signals from ambient light on video signals.
The effectiveness of the proposed laser range system was demonstrated under direct sunlight by an experimental model mounted with two CCD cameras and a semiconductor laser projector of 1[mW] output power with 830[nm] wave length.

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Cyclone dedusters are used in diverse contexts due to their many advantages over other primary collectors. The post cyclone (PoC) is a new secondary collector situated at the top of a conventional reverse flow cyclone, which utilizes the residual swirl available at the gas outlet (vortex ) of the cyclone to capture a certain fraction of the escaped dust. In this paper, one design of PoC is tested where the particles are collected in a bleed flow drawn from the PoC. Subsequent to the particle separation, the lean bleed flow is recycled back to the inlet of the cyclone. The experiments conducted at different bleed flow rates and inlet velocity indicate an increase in overall efficiency of cyclone by 6% in average, and reduction in emission from the vortex by 5-9%.

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A mobile robot requires searching and understanding its immediate environment, when it runs unknown route. There are many researches which making an environmental map using the laser range and the wheel encoder. When using two or more sensors, these methods faced to problem which is higher cost, system complexity and synchronization difficulty. As these reason, this research presents a new method of making an environmental map in a closed area using the mobile robot equipped with only the laser range , which can attach in various mobile objects, without limiting a mobile mechanism to wheels. This paper reports progress of this research by present, the experiment of making an environmental map in a building, and its problem from now.

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In this paper, we consider the problem of estimating motion and shape parameters of a plane undergoing three different motion models using both a CCD camera and a laser range . The camera observes features on the moving plane perspectively or orthographically. The laser range observes a cross section of the plane as a line. We use this time-varying line information for the estimation problem of motion and shape parameters, and obtain the extent to which motion and shape parameters can be estimated.

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In this paper, we present a new approach to improve an angular resolution of a laser range by using a pan unit. In the case of using a laser range in large area applications (e.g. map building, detection and tracking of surrounding objects), since a laser range radiates laser beams from its center position, the density of the laser beams becomes sparse at a far distance from the laser range , which causes the lack of the data points at a far distance. Therefore, we set the pan unit beneath the laser range and made it pan by a higher angular resolution than that of the laser range and compensated for the lack of data points at a far distance. Experimental results show that we can increase the number of the obtained data points from the laser range even if objects are far from the laser range .

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Staphylococcus epidermidis (S. epidermidis) often cause sepsis and related diseases by transfusion of contaminated platelet concentrates (PCs). The proliferation process of this bacterium in PCs has been unclear, thus, bio-imaging system was applied for analyzing the dynamics of S. epidermidis in PCs. S. epidermidis were spiked into PCs or Luria Bertani (LB) broth. These samples were collected at each sampling time during incubation (up to 7 days), and colony-forming-units were counted. Bacterial number and their size distribution in each sample were also determined with a new bio-imaging system. The morphological characters of S. epidermidis growing in the samples were observed precisely by scanning electron microscopy (SEM). The numbers of S. epidermidis were stable for 48 hr after the spiking as lag-phase, while the bio-imaging analysis also showed that aggregates proliferated during “lag-phase.” The aggregates were also observed in LB media, however, their sizes were much smaller than those in PCs. SEM suggested that the aggregates were micro-colonies (MCs) of staphylococcal cells and cores of the MCs are composed with platelets (PLTs). Out results suggested that S. epidermidis formed floating MCs in PCs during “lag-phase.” Therefore, the term of lag phase of S. epidermidis in PCs should be called as “pseudo-lag phase.” The initial processes of forming MCs in PCs are thought to be an interaction between bacterial cells and PLTs. Floating MCs would be the source of biofilms on the inside of PC storage bags. New information obtained in this study would be useful for understanding the dynamics of growing bacteria in PCs.

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These days, it has been pointed that ultrasonic range is very useful for some purpose in robot navigation. The usages of ultrasonic range finders are, for example, recognition of the type of a crossing, detection the obstacle and avoidance of it and so on.
This paper represents some features of an array type and a rotary type ultrasonic range for autonomous mobile robot. And by using these ultrasonic sensor systems, we describe a means of recognizing workspace, and avoiding obstacles among others in detail. We have made some experiments with 2 types ultrasonic range . Experimental results verify its effectiveness in a mobile robot navigation.

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This paper aims at achieving robust direction- of-arrival (DOA) estimation under noisy conditions. To improve the noise robustness, a confidence measure is introduced to estimate the accuracy of each DOA estimate and to adaptively switch over its algorithm depending acoustic environments. DOA estimation is carried out by particle filtering on spatial state space with a target source model and an environmental noise model. The target source model gives a system model in the framework of state estimation, and the noise model tries to find the dominant frequency of the target signal with noisy observation to prepare a reliable likelihood. The proposed confidence measure is defined as effective sample size in particle filtering, and determines whether the noise model should be updated time by time. In this paper, we discuss the suitability of the effective sample size as a confidence measure for DOA estimation, and show the effectiveness with the performance of DOA estimation under a noisy condition.

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