THE EFFECT OF GPS SATELLITE GEOMETRY ON THE PRECISION OF DGPS POSITIONING IN MINNA, NIGERIA

2015 ◽  
Vol 77 (12) ◽  
Author(s):  
Opaluwa Y. D. ◽  
Okorocha V. C. ◽  
Abazu I. C. ◽  
Odumosu J. O. ◽  
Ajayi G. O.
Keyword(s):  
Standard Error ◽  
Statistical Tests ◽  
Temporal Variations ◽  
Relative Positioning ◽  
The Earth ◽  
Satellite Geometry ◽  
Amplifying Effect ◽  
Average Standard Error ◽  
The Impact ◽  
Positional Data

This paper investigates the effect of Satellite Geometry in the Precision of DGPS positioning, since it has an amplifying effect on other sources of errors associated with GPS positioning. DGPS positional data were acquired at three epochs of a day using Promak3 DGPS and post-processed using GNSS solution software. The temporal variations in PDOP, number of visible satellites and the standard errors in relative positioning, (which are all functions of the satellite geometry) were analysed both graphically and statistically (using statext v1.0 software) to ascertain the impact of satellite geometry on the derived positions. The graphical results indicated various temporal variations in the parameters defining a GPS-based position on the earth surface; but the statistical tests conducted show no significant differences in the means of the PDOP and standard error in relative positioning obtained in three epochs at 0.05 significant level. Also, for the short ranges, an average standard error of 0.046m, 0.043m and 0.092m were obtained at the three epochs respectively; while for the medium ranges an average standard error of 0.112m, 0.096m, and 0.123m were obtained at the three epochs respectively.it was concluded that the longer the occupation time, the better the satellite geometry and thus the higher the precision in DGPS positioning.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

An influence of social isolation on the level of physical activity as well as on well-being and mental state of people during the coronavirus COVID-19 pandemic

2019 ◽  
Vol 129 (4) ◽  
pp. 127-131
Author(s):  
Agnieszka Parfin ◽  
Krystian Wdowiak ◽  
Marzena Furtak-Niczyporuk ◽  
Jolanta Herda
Keyword(s):  
Physical Activity ◽  
Social Isolation ◽  
Small Sample Size ◽  
Statistical Tests ◽  
Population Group ◽  
Well Being ◽  
Small Sample ◽  
Subjective Well Being ◽  
Tract Infections ◽  
The Impact

AbstractIntroduction. The COVID-19 is the name of an infectious disease caused by a new strain of coronavirus SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus 2). It was first diagnosed in December 2019 in patients in Wuhan City, Hubei Province, China. The symptoms are dominated by features of respiratory tract infections, in some patients with a very severe course leading to respiratory failure and, in extreme cases to death. Due to the spread of the infection worldwide, the WHO declared a pandemic in March 2020.Aim. An investigation of the impact of social isolation introduced due to the coronavirus pandemic on selected aspects of life. The researchers focused on observing changes in habits related to physical activity and their connections with people’s subjective well-being and emotional state.Material and methods. The study was carried out within the international project of the group „IRG on COVID and exercise”. The research tool was a standardized questionnaire.Results. Based on the data collected and the analysis of the percentage results, it can be observed that the overwhelming majority of people taking up physical activity reported a better mood during the pandemic. However, statistical tests do not confirm these relationships due to the small sample size.Conclusions. Isolation favours physical activity. Future, in-depth studies, by enlarging the population group, are necessary to confirm the above observations.

scholarly journals Assessing the Impact of Attendance Modality on the Learning Performance of a Course on Machines and Mechanisms Theory

Mathematics ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 558
Author(s):  
David Valiente ◽  
Héctor Campello-Vicente ◽  
Emilio Velasco-Sánchez ◽  
Fernando Rodríguez-Mas ◽  
Nuria Campillo-Davo
Keyword(s):  
Statistical Tests ◽  
Group Testing ◽  
Test Group ◽  
Historical Record ◽  
Team Work ◽  
University Education ◽  
Learning Performance ◽  
Control Group ◽  
Face To Face ◽  
The Impact

University education approaches related to the field of science, technology, engineering and mathematics (STEM), have generally particularized on teaching activity and learning programs which are commonly understood as reoriented lessons that fuse theoretic concepts interweaved with practical activities. In this context, team work has been widely acknowledged as a means to conduct practical and hands-on lessons, and has been revealed to be successful in the achievement of exercise resolution and design tasks. Besides this, methodologies sustained by ICT resources such as online or blended approaches, have also reported numerous benefits for students’ active learning. However, such benefits have to be fully validated within the particular teaching context, which may facilitate student achievement to a greater or lesser extent. In this work, we analyze the impact of attendance modalities on the learning performance of a STEM-related course on “Machines and Mechanisms Theory”, in which practical lessons are tackled through a team work approach. The validity of the results is reinforced by group testing and statistical tests with a sample of 128 participants. Students were arranged in a test group (online attendance) and in a control group (face-to-face attendance) to proceed with team work during the practical lessons. Thus, the efficacy of distance and in situ methodologies is compared. Moreover, additional variables have also been compared according to the historical record of the course, in regards to previous academic years. Finally, students’ insights about the collaborative side of this program, self-knowledge and satisfaction with the proposal have also been reported by a custom questionnaire. The results demonstrate greater performance and satisfaction amongst participants in the face-to-face modality. Such a modality is prooven to be statistically significant for the final achievement of students in detriment to online attendance.

scholarly journals Exploring Residents’ Perceptions of the Socio-Cultural Benefits of Tourism Development in the Mountain Area

Societies ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 83
Author(s):  
Iulia C. Muresan ◽  
Rezhen Harun ◽  
Felix H. Arion ◽  
Ava Omar Fatah ◽  
Diana E. Dumitras
Keyword(s):  
Positive Attitude ◽  
Statistical Tests ◽  
Tourism Development ◽  
Principal Component ◽  
Local Communities ◽  
Three Dimensions ◽  
Development Economic ◽  
Mountain Area ◽  
Sustainable Tourism Development ◽  
The Impact

Development of tourism affected the socio-cultural environment of many destinations. Previous studies have focused more on analyzing the impact of tourism on all three dimensions of sustainable development (economic, environment and socio-cultural); therefore, the present paper examines tourism development’s impact with regard to the socio-cultural benefits that enhance sustainable tourism development. A survey based on a questionnaire was employed in June 2018 in a mountain village in Cluj County, Romania. The collected data were analyzed using principal component analysis, and several statistical tests were conducted. The results indicated that the respondents have a positive attitude towards tourism development and socio-cultural perceived benefits. Older people and those running a business tend to perceive more positively the benefits of tourism development. The findings of the research could contribute to future development strategies, as it is well known that supporting local communities influences the success of tourism destination.

scholarly journals The Effect of Using Social Media in the Modern Marketing Communication on the Shaping an External Employer’s Image

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4177
Author(s):  
Agnieszka Izabela Baruk ◽  
Grzegorz Wesołowski
Keyword(s):  
World Literature ◽  
Statistical Tests ◽  
Empirical Studies ◽  
Communication Channels ◽  
Primary Data ◽  
Survey Method ◽  
Marketing Communication ◽  
Chi Square ◽  
The Impact

The aim of this article was to determine the significance of modern marketing communication channels used in the process of shaping the external image of an enterprise as an employer. An analysis of the world literature on marketing, management, marketing communication and human resource management was used to prepare the theoretical part. The results of the analysis indicate a cognitive and research gap regarding the use of modern communication channels for building the external image of an enterprise in the role of an employer. In order to reduce the gap, empirical studies were conducted among young Polish potential employees, in which the survey method was used to gather primary data. The collected data were subjected to statistical analysis, during which the following methods and statistical tests were applied: the analysis of average values, exploratory factor analysis, Kruskal–Wallis test (KW), Pearson chi-square independence test and V-Cramer coefficient analysis. The results of the analyses conducted indicate, inter alia, that statistically significant diversity was identified in the case of non-professional media in terms of respondents’ opinions on whether the employer’s image created by modern media is better than the employer’s image created on the basis of classical marketing communication channels. In the case of professional and non-professional media, the age of the respondents was not a differentiating feature. Moreover, neither for professional media nor for non-professional media were statistically significant dependencies identified between respondents’ opinions on the impact of actions undertaken by enterprises on shaping their positive external image as an employer and respondents’ opinions on whether the employer’s image created on the basis of modern marketing communication channels is more beneficial than the employer’s image created on the basis of classical marketing communication channels. The results obtained on the basis of the research have a cognitive and applicability value, characterized by originality. Until now, the importance of using modern marketing communication channels in shaping the employer’s external image has not been analysed. This also applies to enterprises operating on the energy market.

scholarly journals The potentially hazardous NEA 2001 BB16

2019 ◽  
Vol 28 (1) ◽  
pp. 180-190
Author(s):  
Ireneusz Wlodarczyk
Keyword(s):  
Mean Value ◽  
Optical Observations ◽  
Uniform Sampling ◽  
The Earth ◽  
22Nd Century ◽  
Lyapunov Time ◽  
Gravitational Model ◽  
Calculated Probability ◽  
Potential Impact ◽  
The Impact

AbstractWe computed the impact solutions of the potentially dangerous Near Earth Asteroid (NEA) 2001 BB16 based on 47 optical observations from January 20.08316 UTC, 2001, through February 09.15740 UTC, 2016, and one radar observation from January 19.90347 UTC, 2016. We used two methods to sample the starting Line of Variation (LOV). First method, called thereafter LOV1, with the uniform sampling of the LOV parameter, out to LOV = 5 computing 3000 virtual asteroids (VAs) on both sides of the LOV, which gives 6001 VAs and propagated their orbits to JD2525000.5 TDT=February 12, 2201. We computed the non-gravitational parameterA2=(34.55±7.38)·10–14 au/d2 for nominal orbit of 2001 BB16 and possible impacts with the Earth until 2201. For potential impact in 2195 we find A2=20.0·10−14 au/d2. With a positive value of A2, 2001 BB16 can be prograde rotator. Moreover, we computed Lyapunov Time (LT) for 2001 BB16, which for all VAs, has a mean value of about 25 y. We showed that impact solutions, including the calculated probability of a possible collision of a 2001 BB16 asteroid with the Earth depends on how to calculate and take into account the appropriate gravitational model, including the number of perturbing massive asteroids. In some complicated cases, it may depend also on the number of clones calculated for a given sigma LOV1. The second method of computing the impact solutions, called thereafter LOV2, is based on a non-uniformly sampling of the LOV. We showed that different methods of sampling the LOV can give different impact solutions, but all computed dates of possible impacts of the asteroid 2001 BB16 with the Earth occur in accordance at the end of the 22nd century.

Hospitalitas Kristen Yang Hampir Hilang Pada Kasus Kematian Salah Satu Anggota Masyarakat Di Dusun Beringin, Luwu Utara, Sulawesi Selatan Akibat Covid-19

2021 ◽  
Author(s):  
desna rura sarapang
Keyword(s):  
Virus Disease ◽  
Social Distancing ◽  
Indonesian Government ◽  
Risk Of Death ◽  
The Earth ◽  
Corona Virus ◽  
The World ◽  
Global World ◽  
The Impact ◽  
Christian Hospitality

The emergence of a new virus in the global world at the end of 2019, namely Corona Virus Disease 2019, brought tremendous excitement to all inhabitants of the earth. The emergence of this virus brings tremendous concern and fear to the world because the spread of this virus is quite fast, even the most frightening is that the risk of death of people exposed to this virus is very large. Indonesia itself, cannot avoid the impact of this Covid-19 case. As a form of efforts to prevent and minimize transmission of the virus, the Indonesian government has issued a social distancing / physical distancing recommendation. This situation also causes the interaction between communities to be very limited. This situation seems to be able to eliminate hospitality among the community. This paper aims to emphasize the importance of maintaining the value of Christian hospitality in society amid the Covid-19 pandemic.

The Impact of Primary Care Providers’ Bias on Depression Screening for Lesbian Women

2021 ◽  
pp. 152483992110660
Author(s):  
Shuying Sha ◽  
Mollie Aleshire
Keyword(s):  
Primary Care ◽  
Statistical Tests ◽  
Secondary Analysis ◽  
Primary Care Providers ◽  
Depression Screening ◽  
Lesbian Women ◽  
Care Providers ◽  
Explicit Bias ◽  
Implicit And Explicit ◽  
The Impact

Primary care providers’ (PCPs) implicit and explicit bias can adversely affect health outcomes of lesbian women including their mental health. Practice guidelines recommend universal screening for depression in primary care settings, yet the guidelines often are not followed. The intersection of PCPs’ implicit and explicit bias toward lesbian women may lead to even lower screening and diagnosis of depression in the lesbian population than in the general population. The purpose of this secondary analysis was to examine the relationship between PCPs’ implicit and explicit bias toward lesbian women and their recommendations for depression screening in this population. PCPs ( n = 195) in Kentucky completed a survey that included bias measures and screening recommendations for a simulated lesbian patient. Bivariate inferential statistical tests were conducted to compare the implicit and explicit bias scores of PCPs who recommended depression screening and those who did not. PCPs who recommended depression screening demonstrated more positive explicit attitudes toward lesbian women ( p < .05) and their implicit bias scores were marginally lower than the providers who did not recommend depression screening (p = .068). Implications for practice: Depression screening rates may be even lower for lesbian women due to implicit and explicit bias toward this population. Training to increase providers’ awareness of bias and its harm is the first step to improve primary care for lesbian women. Policies must protect against discrimination based on sexual orientation or gender identity.

Old English Ecotheology

2021 ◽  
Author(s):  
Courtney Catherine Barajas
Keyword(s):  
Old English ◽  
Exeter Book ◽  
Early Medieval ◽  
The Earth ◽  
First Millennium ◽  
The Impact

Old English Ecotheology examines the impact of environmental crises on early medieval English theology and poetry. Like their modern counterparts, theologians at the turn of the first millennium understood the interconnectedness of the Earth community, and affirmed the independent subjectivity of other-than-humans. The author argues for the existence of a specific Old English ecotheology, and demonstrates the influence of that theology on contemporaneous poetry. Taking the Exeter Book as a microcosm of the poetic corpus, she explores the impact of early medieval apocalypticism and environmental anxiety on Old English wisdom poems, riddles, elegies, and saints' lives.

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