scholarly journals Technical study of the effect of laser engraving using uArm swift pro robot

2021 ◽  
Vol 10 (3) ◽  
pp. 182
Author(s):  
Soumen Mondal ◽  
Ajoy Kumar Dutta
Keyword(s):  
Suitable Condition ◽  
Depth Of Penetration ◽  
Statistical Parameters ◽  
Laser Engraving ◽  
Spot Diameter ◽  
Penetration Effect ◽  
Working Length ◽  
Technical Study ◽  
Observation Method ◽  
The Impact

<p>Laser engraving is the most non - traditional and efficient working method in the machining of materials of different geometry as compared to conventional methods. The main objective of this study is to determine the impact of uArm swift pro robot operated laser engraving process on a wooden pitch board piece. However, the robot was connected with uArm Studio 1.1.22 software to perform laser engraving operation. For this purpose the effect of process parameters like spot diameter and depth of penetration were investigated with different working length of the robot end effector, measured from wooden pitch board base. Experimental observation method was used to investigate the formation of deep and light engraving pattern on the pitch board surface by measuring penetration depth and spot diameter in suitable condition. The result obtained from the experiment and statistical parameters showed a new dimension to find a suitable working length of the robot assisted laser nozzle where the laser penetration effect was clearly perceptible for the wooden material.</p>

scholarly journals Measurement of the Sea Surface Height with Airborne GNSS Reflectometry and Delay Bias Calibration

2021 ◽  
Vol 13 (15) ◽  
pp. 3014
Author(s):  
Feng Wang ◽  
Dongkai Yang ◽  
Guodong Zhang ◽  
Jin Xing ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Wind Speed ◽  
Arrival Time ◽  
Elevation Angle ◽  
Satellite System ◽  
Sea Surface Height ◽  
Antenna Pattern ◽  
Sea Surface ◽  
Observation Method ◽  
Global Navigation Satellite ◽  
The Impact

Sea surface height can be measured with the delay between reflected and direct global navigation satellite system (GNSS) signals. The arrival time of a feature point, such as the waveform peak, the peak of the derivative waveform, and the fraction of the peak waveform is not the true arrival time of the specular signal; there is a bias between them. This paper aims to analyze and calibrate the bias to improve the accuracy of sea surface height measured by using the reflected signals of GPS CA, Galileo E1b and BeiDou B1I. First, the influencing factors of the delay bias, including the elevation angle, receiver height, wind speed, pseudorandom noise (PRN) code of GPS CA, Galileo E1b and BeiDou B1I, and the down-looking antenna pattern are explored based on the Z-V model. The results show that (1) with increasing elevation angle, receiver height, and wind speed, the delay bias tends to decrease; (2) the impact of the PRN code is uncoupled from the elevation angle, receiver height, and wind speed, so the delay biases of Galileo E1b and BeiDou B1I can be derived from that of GPS CA by multiplication by the constants 0.32 and 0.54, respectively; and (3) the influence of the down-looking antenna pattern on the delay bias is lower than 1 m, which is less than that of other factors; hence, the effect of the down-looking antenna pattern is ignored in this paper. Second, an analytical model and a neural network are proposed based on the assumption that the influence of all factors on the delay bias are uncoupled and coupled, respectively, to calibrate the delay bias. The results of the simulation and experiment show that compared to the meter-level bias before the calibration, the calibrated bias decreases the decimeter level. Based on the fact that the specular points of several satellites are visible to the down-looking antenna, the multi-observation method is proposed to calibrate the bias for the case of unknown wind speed, and the same calibration results can be obtained when the proper combination of satellites is selected.

scholarly journals Root canal curvature as a prognostic factor influencing the diagnostic accuracy of radiographic working length determination and postoperative canal axis modification: an in vitro comparative study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Bestoon Mohammed Faraj
Keyword(s):  
Root Canal ◽  
Radiographic Images ◽  
The Real ◽  
Root Canals ◽  
Length Estimation ◽  
Working Length ◽  
Length Determination ◽  
Case Difficulty Assessment ◽  
The Impact

Abstract Background Radiographic analysis of tooth morphology is mandatory for accurate calibration of the degree of canal curvature angle and radiographic working length to its real dimensions in case difficulty assessment protocols. This study aimed to determine the impact of the degree of root canal curvature angle on maintaining the real working length and the original canal axis of prepared root canals using a reciprocating rotary instrumentation technique. Methods Radiographic image analysis was performed on 60 extracted single-rooted human premolar teeth with a moderate canal curvature (10°–25°) and severe canal curvature (26°–70°). Working length and longitudinal canal axis were determined using cone-beam computed tomography (CBCT) and digital periapical radiography. The real canal length was determined by subtracting 0.5 mm from the actual canal length. Root canals were prepared using the WaveOne Gold reciprocating file (Dentsply Maillefer, Ballaigues, Switzerland). Results There was no significant relation of the degree of canal curvature angle to the accuracy of radiographic working length estimated on CBCT and digital periapical radiographic techniques (P > 0.05). Postinstrumentation changes in the original canal axis between moderate and severe canal curvature angles, assessed on CBCT and periapical digital radiographic images were statistically non-significant (P > 0.05). Conclusions A standardized digital periapical radiographic method performed similarly to the CBCT technique near to its true working length. No significant interaction exists between the diagnostic working length estimation, postoperative root canal axis modification, and the degree of canal curvature angle, using reciprocating rotary instrumentation technique.

IMPACT RESISTANCE PROPERTIES OF KEVLAR/GLASS FIBER HYBRID COMPOSITE LAMINATES

2015 ◽  
Vol 76 (3) ◽  
Author(s):  
Norazean Shaari ◽  
Aidah Jumahat ◽  
M. Khafiz M. Razif
Keyword(s):  
Glass Fiber ◽  
Hybrid Composite ◽  
Composite Laminates ◽  
Impact Damage ◽  
Impact Resistance ◽  
Impact Behavior ◽  
Slight Reduction ◽  
Depth Of Penetration ◽  
Damage Degree ◽  
The Impact

In this paper, the impact behavior of Kevlar/glass fiber hybrid composite laminates was investigated by performing the drop weight impact test (ASTM D7136). Composite laminates were fabricated using vacuum bagging process with an epoxy matrix reinforced with twill Kevlar woven fiber and plain glass woven fiber. Four different types of composite laminates with different ratios of Kevlar to glass fiber (0:100, 20:80, 50:50 and 100:0) were manufactured. The effect of Kevlar/glass fiber content on the impact damage behavior was studied at 43J nominal impact energy. Results indicated that hybridization of Kevlar fiber to glass fiber improved the load carrying capability, energy absorbed and damage degree of composite laminates with a slight reduction in deflection. These results were further supported through the damage pattern analysis, depth of penetration and X-ray evaluation tests. Based on literature work, studies that have been done to investigate the impact behaviour of woven Kevlar/glass fiber hybrid composite laminates are very limited. Therefore, this research concentrates on the effect of Kevlar on the impact resistance properties of woven glass fibre reinforced polymer composites.

The acceptance of spelling variants as symbols of Croatian spelling changes (1994–2013)

2021 ◽  
Vol 24 (1) ◽  
pp. 110-148
Author(s):  
Tomislav Stojanov
Keyword(s):  
Questionnaire Survey ◽  
Native Speakers ◽  
First Year ◽  
Educational Setting ◽  
The Public ◽  
Study Programme ◽  
Spelling Variant ◽  
The Media ◽  
Technical Study ◽  
The Impact

Abstract This paper discusses the impact of several spelling changes in Croatian on the level of the literacy of native speakers. Since 1986, there have been five official recommendations for usage that pertain to five different orthographic manuals. This research focuses on three spelling points with considerable identity-related repercussions among the public and the media, which are sometimes named the spelling symbols of Croatian. A questionnaire-survey comprised of 36 tests was completed among 1063 students on a technical study programme each year for eight consecutive academic years. Eight generations of first-year undergraduates, who do not study language in an educational setting, have accepted the new spellings, contingent on a frequency principle. The more frequent a spelling variant occurs, the less the chance that the new spelling variant is accepted, and vice versa. Given the lack of established and enduring spelling norms, combined with ideological oppositions between the old and new spelling forms, students have been guided mainly by their capacity to write the most common form.

scholarly journals FUNGSI ADJEKTIVA KOMPARATIF DALAM BAHASA MADURA DIALEK KANGEAN DAN DAMPAKNYA BAGI MASYARAKAT KANGEAN: KAJIAN PRAGMATIK [The Function of Comparative Adjectives in Kangean Dialect of Madurese Language and its Impact]

TOTOBUANG ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 257-271
Author(s):  
Mutaallim Hafidz ◽  
Fahmi Reza Alfani ◽  
La Mahidin ◽  
Yuana Dwi Agustin ◽  
Damon Wicaksi
Keyword(s):  
Qualitative Research ◽  
Data Analysis ◽  
Note Taking ◽  
Field Note ◽  
Distributional Method ◽  
Written Form ◽  
Observation Method ◽  
The Impact ◽  
Comparative Adjectives ◽  
Participatory Observation

Comparative adjectives of Kangean Dialect of Madurese Language (KDML) are the basic adjectives that has A+D+(-an) stucture or lebbi. This study explored the function of comparative adjectives in KDML and its impact for the Kangean community. The theories used to explore and determine the comparative adjective function are descriptive and pragmatic theories. The research is a qualitative research. The method used in this research is the participatory observation method. The data were obtained from interviews with the dialect speakers by voice recording and field note-taking. Besides, researchers used the introspectiveve method (reflective-introspection method). The data that has been collected were transcribed into written form of orthographic transcription, then translated and classified according to its function. The method applied for analyzing the data are equivalent and distributional method. Meanwhile, the methods used for displaying the results of data analysis are informal and formal steps. The results showed that in KDML, there are several functions of comparative adjectives, namely to motivate, praise, admonish, command, insinuate, advise, criticize and accuse. Meanwhile, the impact of adjective utterances, people become more optimistic, comfortable, easy to appreciate, entertained, strong, cautious, deterred, and humble. Adjektiva komparatif bahasa Madura dialek Kangean (BMDK) merupakan adjektiva dasar yang memiliki struktur A+D+(-an) atau lebbi. Penelitian ini mengeksplorasi fungsi adjektiva komparatif dalam BMDK dan dampaknya bagi komunitas Kangean. Teori yang digunakan untuk menggali dan menentukan fungsi adjektiva komparatif adalah teori deskriptif dan pragmatik. Penelitian ini adalah penelitian kualitatif. Metode yang digunakan adalah metode observasi partisipatif. Data diperoleh melalui wawancara dengan penutur dialek Kangean melalui rekaman dan catatan lapangan. Selain itu, peneliti menggunakan metode introspektif (metode reflektif-introspekturis). Data yang sudah terkumpul ditranskrip ke dalam bentuk tulisan dengan transkripsi ortografis, kemudian diterjemahkan dan diklasifikasikan sesuai fungsinya. Metode yang digunakan untuk menganalisis data adalah metode ekuivalen dan metode agih dan metode yang digunakan untuk menampilkan hasil analisis data adalah langkah-langkah formal dan nonformal. Hasil penelitian menunjukkan bahwa dalam BMDK terdapat beberapa fungsi adjektiva komparatif yakni untuk memotivasi, memuji, menegur, memerintah, menyindir, menasihati, mencela dan menuduh. Sedangkan dampaknya adalah masyarakat lebih optimis, peka, mudah menghargai, terhibur, kuat, berhati-hati, jera, dan rendah diri.   

scholarly journals STUDY ON CYCLONE INDUCED PHYTOPLANKTON BLOOM IN THE ARABIAN SEA THROUGH GAP-FREE RECONSTRUCTED CHLOROPHYLL-A DATA

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 1391-1396
Author(s):  
R. Shunmugapandi ◽  
S. Gedam ◽  
A. B. Inamdar
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Chlorophyll A ◽  
Arabian Sea ◽  
Phytoplankton Bloom ◽  
Suitable Condition ◽  
Sea Surface ◽  
Cyclone Track ◽  
Chl A ◽  
The Impact

Abstract. Ocean surface phytoplankton responses to the tropical cyclone (TC)/storms have been extensively studied using satellite observations by aggregating the data into a weekly or bi-weekly composite. The reason behind is the significant limitations found in the satellite-based observation is the missing of valid data due to cloud cover, especially at the time of cyclone track passage. The data loss during the cyclone is found to be a significant barrier to efficiently investigate the response of chl-a and SST during cyclone track passage. Therefore it is necessary to rectify the above limitation to effectively study the impact of TC on the chlorophyll-a concentration (chl-a) and the sea surface temperature (SST) to achieve a complete understanding of their response to the TC prevailed in the Arabian Sea. Intending to resolve the limitation mentioned above, this study aims to reconstruct the MODIS-Aqua chl-a, and SST data using Data Interpolating Empirical Orthogonal Function (DINEOF) for all the 31 cyclonic events occurred in the Arabian Sea during 2003-2018 (16 years). Reconstructed satellite retrieved data covering all the cyclonic events were further used to investigate the chl-a and SST dynamics during TC. From the results, the exciting fact has been identified that only two TC over the eastern-AS were able to induce phytoplankton bloom. On investigating this scenario using sea surface temperature, it was disclosed that the availability of nutrients decides the suitable condition for the phytoplankton to proliferate in the surface ocean. Relevant to the precedent criterion, the results witnessed that the 2 TC (Phyan and Ockhi cyclone) prevailed in the eastern AS invoked a suitable condition for phytoplankton bloom. Other TC found to be less provocative either due to less intensity, origination region or the unsuitable condition. Thereby, gap-free reconstructed daily satellite-derived data efficiently investigates the response of bio-geophysical parameters during cyclonic events. Moreover, this study sensitised that though several TC strikes the AS, only two could impact phytoplankton productivity and SST found to highly consistent with the chl-a variability during the cyclone passage.

The Influence of Alumina Filler on Impact Properties of Short Glass Fiber Reinforced Epoxy

2013 ◽  
Vol 393 ◽  
pp. 88-93 ◽  
Author(s):  
Mohd Shahneel Saharudin ◽  
Aidah Jumahat ◽  
Amir Z.A. Kahar ◽  
Shaharudin Ahmad
Keyword(s):  
Glass Fiber ◽  
Fiber Reinforced ◽  
Depth Of Penetration ◽  
Impact Properties ◽  
Impact Time ◽  
Short Glass Fiber ◽  
Glass Fiber Reinforced ◽  
The Impact ◽  
Total Impact ◽  
Short Glass

mpact resistance is one of the main consideration in measuring service life, liability and safety of polymer composite structures or products. Impact resistance of a composite material can be measured in terms of energy absorption, depth of penetration and total impact time. In this study, the influence of alumina Al2O3on impact properties of short glass fiber reinforced polymer was investigated. The drop weight impact tests were performed in accordance to ASTM D7136 standard using Dynatup impact tester. Based on the results, the incorporation of micronsize alumina filler enhanced the energy absorbed during crushing, reduced the depth of penetration of the impactor and expanded the total impact time hence improved the impact properties of the composites.

Dukungan Sosial Suami Pada Ibu Dengan Depresi Postpartum Pasca Melahirkan Anak Pertama

2016 ◽  
Vol 3 (1) ◽  
pp. 19
Author(s):  
Dian Mustika Sari ◽  
Eko Hardi Ansyah
Keyword(s):  
Social Support ◽  
Postpartum Depression ◽  
Sampling Technique ◽  
Significant Others ◽  
Research Subjects ◽  
First Child ◽  
Birth Factors ◽  
The Subject ◽  
Observation Method ◽  
The Impact

This study aims to provide an overview of social support her husband with postpartum depression in mothers postpartum first child and the impact of social support provided to the mother's husband. Social support is in the form of emotional support, the support award, instrumental support and informative support. The method used in this research is using qualitative exploratory study the two subjects who had a husband and wife with postpartum depression after giving birth first child with wife aged 21-28 years. Determination of the subjects in this study using purposive sampling technique and is located in several places according to the agreement of the subject and significant others. Data collection methods used were observation method using anecdotel record with the observation that social support indicators husband and interview methods are equipped with general guidance interview. The results showed that each subject provide social support her husband with different forms of support for marriage influenced by the subject. The effect of the second wife of the study subjects also differ on the subject of the first wife can get through 25 days postpartum depression after giving birth, while the second subject can get through 40 days postpartum depression after giving birth. Factors support from significant others and coping also affect maternal postpartum depression can get through the second wife of the research subjects. 

Numerical Study of High Velocity Impact onto MMC/Ceramic Layered Systems

2016 ◽  
Vol 715 ◽  
pp. 210-215
Author(s):  
Seung Hwan Lee ◽  
Minh Lee
Keyword(s):  
Mild Steel ◽  
Ceramic Tile ◽  
Volume Fraction ◽  
Numerical Study ◽  
Tungsten Alloy ◽  
Layered Systems ◽  
Depth Of Penetration ◽  
Ballistic Performance ◽  
Long Rod ◽  
The Impact

Metal Matrix Composites (MMCs) can be applied to military applications due to the light weight and the ballistic performance. In this study, a numerical simulation has been performed for the penetration of a long-rod penetrator into MMC/Ceramic layered systems. The impact velocity is 1.5km/s and the length to diameter (L/D) ratio is 10.6. First, the ballistic performances of each candidate materials are examined by doing the semi-infinite target simulation to estimate the depth of penetration (DOP) data. The materials included in this study are four (tungsten alloy, mild steel, SiC, MMC. The MMC materials are SiC/Al7075 (volume fraction around 45%). For a reference data, the impact simulation into mild-steel target only was also carried out. Finally, the main simulation is performed by varying the position of ceramic tile at three types of the thickness of ceramic tile. The residual velocity, residual mass and residual kinetic energy of the long-rod are obtained from the simulation. Based on these predicted values, the optimum system of the layered plate has been estimated.

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