scholarly journals Measurement of Environmental Gamma Dose at AECD Campus of Bangladesh

2014 ◽  
Vol 6 (2) ◽  
pp. 285-291 ◽  
Author(s):  
M. S. Rahman ◽  
M. A. Islam ◽  
A. Begum ◽  
M. M. Rahman ◽  
M. H. Ahsan
Keyword(s):  
Dose Rate ◽  
Global Positioning System ◽  
Hpge Detector ◽  
Gamma Ray ◽  
Gamma Dose ◽  
Positioning System ◽  
Gps Navigation ◽  
Global Positioning ◽  
Measured Dose

A portable HPGe detector has been employed to assess environmental gamma-ray dose following in-situ technique from the primordial radionuclide 40K in the soil at 15 monitoring points (MPs) in the environment at the Atomic Energy Centre, Dhaka (AECD) campus, Bangladesh. The MPs were marked-out using Global Positioning System (GPS) navigation. The measured dose rate due to 40K range from 0.0428 µGy.h-1 to 0.1222 µGy.h-1 with an average of 0.0828 ± 0.0225 µGy.h-1. Keywords: Gamma; Environment; Dose rate.© 2014 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v6i2.17146 J. Sci. Res. 6 (2), 285-291 (2014)  

scholarly journals Ice tectonic deformation during the rapid in situ drainage of a supraglacial lake on the Greenland Ice Sheet

2013 ◽  
Vol 7 (1) ◽  
pp. 129-140 ◽  
Author(s):  
S. H. Doyle ◽  
A. L. Hubbard ◽  
C. F. Dow ◽  
G. A. Jones ◽  
A. Fitzpatrick ◽  
...  
Keyword(s):  
Global Positioning System ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Tectonic Deformation ◽  
Positioning System ◽  
Differential Motion ◽  
Global Positioning ◽  
Lake Drainage ◽  
Lake Record

Abstract. We present detailed records of lake discharge, ice motion and passive seismicity capturing the behaviour and processes preceding, during and following the rapid drainage of a 4 km2 supraglacial lake through 1.1-km-thick ice on the western margin of the Greenland Ice Sheet. Peak discharge of 3300 m3 s−1 coincident with maximal rates of vertical uplift indicates that surface water accessed the ice–bed interface causing widespread hydraulic separation and enhanced basal motion. The differential motion of four global positioning system (GPS) receivers located around the lake record the opening and closure of the fractures through which the lake drained. We hypothesise that the majority of discharge occurred through a 3-km-long fracture with a peak width averaged across its wetted length of 0.4 m. We argue that the fracture's kilometre-scale length allowed rapid discharge to be achieved by combining reasonable water velocities with sub-metre fracture widths. These observations add to the currently limited knowledge of in situ supraglacial lake drainage events, which rapidly deliver large volumes of water to the ice–bed interface.

DERIVATION OF INDOOR GAMMA DOSE RATE FROM HIGH RESOLUTION IN SITU GAMMA RAY SPECTRA

2000 ◽  
Vol 79 (3) ◽  
pp. 274-281 ◽  
Author(s):  
A. Clouvas ◽  
S. Xanthos ◽  
M. Antonopoulos-Domis
Keyword(s):  
High Resolution ◽  
Dose Rate ◽  
Gamma Ray ◽  
Gamma Dose ◽  
Gamma Dose Rate

scholarly journals Using signals from GLONASS/GPS navigation systems to correct the readings of a digital magnetic compass

2019 ◽  
Vol 30 ◽  
pp. 03006
Author(s):  
Hau Vu Xuan ◽  
V.E. Ivanov ◽  
Thach Nguyen Dinh
Keyword(s):  
Global Positioning System ◽  
Magnetic Compass ◽  
Global Navigation Satellite Systems ◽  
Positioning System ◽  
Navigation Systems ◽  
Satellite Systems ◽  
Gps Navigation ◽  
Global Positioning ◽  
Global Navigation Satellite ◽  
Compass System

The article describes the results obtained from research, manufacture and quality improvement of an inexpensive digital magnetic compass system. Given that the receivers of the global navigation satellite systems (GNSS) signals are not expensive, in order to increase the accuracy and reliability of the compass, in this paper, the authors propose a method to use the signal of the GNSS global positioning system to compare and adjust the azimuth value of the Digital magnetic compass (DMC).

scholarly journals Underwater Doppler Navigation with Self-calibration

2015 ◽  
Vol 69 (2) ◽  
pp. 295-312 ◽  
Author(s):  
Xianfei Pan ◽  
Yuanxin Wu
Keyword(s):  
Global Positioning System ◽  
Autonomous Navigation ◽  
Doppler Velocity ◽  
Positioning System ◽  
Combined System ◽  
Inertial Measurement ◽  
Global Positioning ◽  
Measurement Units ◽  
Underwater Navigation

Precise autonomous navigation remains a substantial challenge to all underwater platforms. Inertial Measurement Units (IMU) and Doppler Velocity Logs (DVL) have complementary characteristics and are promising sensors that could enable fully autonomous underwater navigation in unexplored areas without relying on additional external Global Positioning System (GPS) or acoustic beacons. This paper addresses the combined IMU/DVL navigation system from the viewpoint of observability. We show by analysis that under moderate conditions the combined system is observable. Specifically, the DVL parameters, including the scale factor and misalignment angles, can be calibrated in-situ without using external GPS or acoustic beacon sensors. Simulation results using a practical estimator validate the analytic conclusions.

scholarly journals Finding and characterizing hidden dips in roads

2015 ◽  
Vol 10 (4) ◽  
pp. 340-345 ◽  
Author(s):  
María Castro ◽  
Alejandro de Blas ◽  
Roberto Rodríguez-Solano ◽  
José Angel Sánchez
Keyword(s):  
Information System ◽  
Geographic Information System ◽  
Global Positioning System ◽  
Video Camera ◽  
Geographic Information ◽  
Positioning System ◽  
Global Positioning ◽  
Quantitative Procedure

Sometimes when connecting a crest vertical curve, followed by a sag and another crest, a road disappears from the view of a driver to reappear later. Then, there is a loss of path or a hidden dip in a road. It is essential to avoid losses when they hide dangerous points, such as intersections or unexpected changes in direction. In addition, this loss disrupts drivers and its effect depends on quantitative relationships between the variables involved in the problem. This paper presents a quantitative procedure for studying hidden dips in roads. The method is based on calculating the sections visible and hidden by a driver using a Geographic Information System. An application to a Spanish road is presented. Procedure results were compared with in situ carried out studies and with a video of the highway recorded using a Global Positioning System equipped video camera embarked in a vehicle. The main quantitative issues related to hidden dips are discussed.

scholarly journals In-Situ Environmental Gamma Radiation Monitoring at Ramna Thana, Dhaka, Bangladesh

2019 ◽  
Vol 11 (3) ◽  
pp. 263-272
Author(s):  
M. S. Mian ◽  
M. S. Rahman ◽  
J. Islam ◽  
K. N. Sakib ◽  
M. M. Tasnim ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Global Positioning System ◽  
Annual Effective Dose ◽  
Natural Radionuclides ◽  
Outdoor Environment ◽  
Dose Rates ◽  
Gps Navigation ◽  
Sampling Locations ◽  
Global Positioning

Environmental gamma radiation dose rates were measured using a digital portable Gamma-Scout detector from April-May 2018. For this, total 22 monitoring points (MP) were selected in the outdoor environment in the area of Ramna Thana under Dhaka city. The MPs were marked-out using Global Positioning System (GPS) navigation. The GPS reading of the sampling locations were varied from E: 90o23.568' to E: 90o24.895' and from N: 23o44.031' to N: 23o45.018'. The measured dose rates due to natural radionuclides were ranged from 0.115 ± 0.042 µSv.hr-1 to 0.186 ± 0.051 µSv.h-1 with an average of 0.145 ± 0.044 µSv.h-1. The annual effective dose to the population from outdoor environmental gamma radiation was varied from 0.201 ± 0.073 mSv to 0.326 ± 0.090 mSv with an average of 0.255 ± 0.073 mSv. This kind of study is required to detect the presence of natural radionuclides and artificial radionuclides (if any) releasing from nuclear and radiological facilities in the country or from neighboring countries for normal operations or in case of accident/incident. From this study, it can be concluded that there is no radiation burden to the environment due to man-made sources.

scholarly journals MANAGEMENT ACCOUNTING OF THE TRANSPORTATION SERVICES’ SELF-COST USING A GLOBAL POSITIONING SYSTEM

2018 ◽  
Vol 1 (2(14)) ◽  
pp. 25-30
Author(s):  
Zenovii-Mykhailo Vasylovych Zadorozhnyi ◽  
Volodymyr Vasylovych Muravskyi ◽  
Oleg Antonovich Shevchuk
Keyword(s):  
Global Positioning System ◽  
Management Accounting ◽  
Automated System ◽  
Positioning System ◽  
Traffic Flows ◽  
Gps Navigation ◽  
Transport Services ◽  
Global Positioning ◽  
And Control ◽  
Automated Management

Urgency of the research. Informatization of social processes and global information and computing services introduction are necessary to improve the methodology and organization of automated management accounting. Target setting. One of the most important data collection technologies that is actively used in the transport industry is the global positioning system. Most innovative business entities perform the organization of an automated system for managing traffic flows based on GPS navigation technology. Actual scientific researches and issues analysis. Peculiarities of the use of GPS-navigation technology are researched by scientists from different areas of economic science: A. E. Goriev, D. A. Palant, Ye. T. Skoryk and V. М. Kondratiuk and others. Uninvestigated parts of general matters defining. Accounting aspects of the introduction of GPS-navigation technology are left without scientists' attention, which actualizes research of the prospects of automated management accounting and control of traffic flows improving. The research objective. To increase the efficiency of transportation, it is necessary to find out the possibilities of using GPS-navigation technology in automation of accounting and control. The statement of basic materials. On the basis of data from the system of global positioning it is advisable to automate the calculation of the self-cost of provided transport services. It is necessary to apply a two-dimensional calculating unit – “ton-kilometer”, which fully considers of the conditions of a vehicle management. Since all the credentials are received solely in electronic form, the need for the formation of printed copies of primary documents is reduced. Accelerating the receipt of necessary information for the adoption of operational management decisions. Conclusions. The introduction of the global positioning system ensures the collection and processing of accounting information without the direct involvement of employees of the enterprise, documentation and document management exclusively in electronic mode, reliable and timely calculation of the cost of transport services.

Aplikasi Pemosisi Lokal Berbasis Android Dengan Menggunakan GPS

INTI TALAFA ◽  
2018 ◽  
Vol 8 (2) ◽  
Author(s):  
Yaman Khaeruzzaman
Keyword(s):  
Global Positioning System ◽  
Positioning System ◽  
Database Server ◽  
Global Positioning

Seiring dengan pesatnya kemajuan teknologi saat ini, kebutuhan manusia menjadi lebih beragam, termasuk kebutuhan akan informasi. Tidak hanya media informasinya yang semakin beragam, jenis informasi yang dibutuhkan juga semakin beragam, salah satunya adalah kebutuhan informasi akan posisi kita terhadap lingkungan sekitar. Untuk memenuhi kebutuhan itu sebuah sistem pemosisi diciptakan. Sistem pemosisi yang banyak digunakan saat ini cenderung berfokus pada lingkup ruang yang besar (global) padahal, dalam lingkup ruang yang lebih kecil (lokal) sebuah sistem pemosisi juga diperlukan, seperti di ruang-ruang terbuka umum (taman atau kebun), ataupun dalam sebuah bangunan. Sistem pemosisi lokal yang ada saat ini sering kali membutuhkan infrastruktur yang mahal dalam pembangunannya. Aplikasi Pemosisi Lokal Berbasis Android dengan Menggunakan GPS ini adalah sebuah aplikasi yang dibangun untuk memenuhi kebutuhan pengguna akan informasi lokasi dan posisi mereka terhadap lingkungan di sekitarnya dalam lingkup ruang yang lebih kecil (lokal) dengan memanfaatkan perangkat GPS (Global Positioning System) yang telah tertanam dalam perangkat smartphone Android agar infrastruktur yang dibutuhkan lebih efisien. Dalam implementasinya, Aplikasi Pemosisi Lokal ini bertindak sebagai klien dengan dukungan sebuah Database Server yang berfungsi sebagai media penyimpanan data serta sumber referensi informasi yang dapat diakses melalui jaringan internet sehingga tercipta sebuah sistem yang terintegrasi secara global. Kata kunci: aplikasi, informasi, pemosisi, GPS.

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