scholarly journals Experimental Estimation of Deviation Frequency Within the Spectrum of Scintillations of the Carrier Phase of GNSS Signals

2021 ◽  
Author(s):  
Vladislav Demyanov ◽  
Ekaterina Danilchuk ◽  
Yury Yasyukevich ◽  
Maria Sergeeva
Keyword(s):  
Carrier Phase ◽  
Radio Channel ◽  
Sampling Rate ◽  
Optimal Sampling ◽  
Scintillation Spectrum ◽  
Local Conditions ◽  
Variable Part ◽  
Phase Data ◽  
Observation Period

The term deviation frequency denotes the boundary between the variable part of the amplitude and phase scintillation spectrum and the part of uninformative noises. We suggested the concept of the “characteristic deviation frequency” during the observation period which is defined as the most probable value of the deviation frequency under current local conditions. This work is a case study of the characteristic deviation frequency (fd) registered for GPS, GLONASS, Galileo and SBAS signals under quiet and weakly disturbed geomagnetic conditions in April 2021 at the mid-latitude GNSS station. Our results demonstrated that the fd value for all signal components of GPS, GLONASS and GALILEO signals varied within 15-22 Hz. The characteristic deviation frequency was 20 Hz for the mentioned GNSS signals. In difference, the deviation frequency was limited within 13-20 Hz for SBAS with the lower characteristic deviation frequency at 18 Hz. We assume that the concept of the characteristic deviation frequency can be used to determine the optimal sampling rate of the GNSS carrier phase data for the ionospheric studies. The characteristic deviation frequency can also characterize the state of the regular trans-ionospheric radio channel.

scholarly journals Experimental Estimation of Deviation Frequency within the Spectrum of Scintillations of the Carrier Phase of GNSS Signals

2021 ◽  
Vol 13 (24) ◽  
pp. 5017
Author(s):  
Vladislav Demyanov ◽  
Ekaterina Danilchuk ◽  
Yury Yasyukevich ◽  
Maria Sergeeva
Keyword(s):  
Geomagnetic Storm ◽  
Carrier Phase ◽  
Sampling Rate ◽  
Optimal Sampling ◽  
Scintillation Spectrum ◽  
Local Conditions ◽  
Variable Part ◽  
Phase Data ◽  
Observation Period

The term deviation frequency (fd) denotes the boundary between the variable part of the amplitude and phase scintillation spectrum and the part of uninformative noises. We suggested the concept of the “characteristic deviation frequency” during the observation period. The characteristic deviation frequency is defined as the most probable value of the deviation frequency under current local conditions. Our case study involved GPS, GLONASS, Galileo and SBAS data under quiet and weakly disturbed geomagnetic conditions (geomagnetic storm on 16 April 2021, Kpmax = 5, SYM-Hmin = −57 nT) at the mid-latitude GNSS station. Our results demonstrated that the deviation frequency for all signal components of GPS, GLONASS and Galileo varies within 15–22 Hz. The characteristic deviation frequency was 20 Hz for the mentioned GNSS signals. The SBAS differs from other systems: deviation frequency varies within 13–20 Hz. The characteristic deviation frequency is lower and equal to 18 Hz. We suggest the characteristic deviation frequency to determine the optimal sampling rate of the GNSS carrier phase data for the ionospheric studies. In turn, the deviation frequency can be considered as a promising index to estimate the boundary of non-variability of the ionosphere.

From converts to cooperation: Protestant internationalism, US missionaries and Indian Christians and ‘Professional’ social work between Boston and Bombay (c. 1920–1950)

2021 ◽  
pp. 1-20
Author(s):  
Michael Phillipp Brunner
Keyword(s):  
Social Work ◽  
North America ◽  
Social Gospel ◽  
Local Conditions ◽  
Historical Approach ◽  
The Social ◽  
Social Concerns ◽  
High Phase

Abstract The 1920s and 30s were a high phase of liberal missionary internationalism driven especially by American-led visions of the Social Gospel. As the missionary consensus shifted from proselytization to social concerns, the indigenization of missions and the role of the ‘younger churches’ outside of Europe and North America was brought into focus. This article shows how Protestant internationalism pursued a ‘Christian Sociology’ in dialogue with the field’s academic and professional form. Through the case study of settlement sociology and social work schemes by the American Marathi Mission (AMM) in Bombay, the article highlights the intricacies of applying internationalist visions in the field and asks how they were contested and shaped by local conditions and processes. Challenging a simplistic ‘secularization’ narrative, the article then argues that it was the liberal, anti-imperialist drive of the missionary discourse that eventually facilitated an American ‘professional imperialism’ in the development of secular social work in India. Adding local dynamics to the analysis of an internationalist discourse benefits the understanding of both Protestant internationalism and the genesis of Indian social work and shows the value of an integrated global micro-historical approach.

scholarly journals Suspended shellfish culture impacts on the benthic layer: a case study in Brazilian subtropical waters

2012 ◽  
Vol 60 (2) ◽  
pp. 219-232 ◽  
Author(s):  
Natália de Moraes Rudorff ◽  
Carla Van Der Haagen Custodio Bonetti ◽  
Jarbas Bonetti Filho
Keyword(s):  
Total Population ◽  
Organic Content ◽  
Multivariate Techniques ◽  
Data Sets ◽  
Productive Activity ◽  
Local Conditions ◽  
Benthic Environment ◽  
Shellfish Culture ◽  
Population Ratio

This study aimed to assess benthic impacts of suspended shellfish cultures in two marine farms located in South Bay, Florianópolis (SC, Brazil). The goal was to detect changes in the benthic layer and evaluate the influence of local conditions, such as hydrodynamics and geomorphology, on the degree of impact at each site. The method included analysis of three groups of oceanographic descriptors: hydrodynamic; morpho-sedimentological (bathymetry, grain size and organic content), and ecological (foraminiferal fauna). Data sets were analyzed using geostatistical and multivariate techniques. Ecological descriptors seemed to be more effective under different environmental conditions than sedimentological variables. Those that best identified culture-related biodeposits, were: dominance of Ammonia tepida; test size; and living: total population ratio. Only slight differences were observed within and outside the culture structures. However, a greater alteration was observed at the site with weaker hydrodynamics and located in shallower depths. The conclusion is that biodeposition at studied still causes little alteration in the local benthic environment. However, local factors such as hydrodynamics and geomorphology were shown to be important in minimizing these impacts. These are criteria that should be considered in site selection programs for the development of this productive activity.

scholarly journals A business transformation model to enhance the sustainability of small-sized family businesses

2021 ◽  
Vol 19 (1) ◽  
pp. 185-197
Author(s):  
Anita Wijayanti ◽  
Massila Kamalrudin ◽  
Safiah Sidek ◽  
Kartika Hendra Titisari
Keyword(s):  
Family Business ◽  
Environmental Changes ◽  
Transformation Process ◽  
Family Businesses ◽  
Transformation Model ◽  
Business Transformation ◽  
Doing Business ◽  
Different Types ◽  
Observation Period

Business transformation is essential to making the small-sized family business more sustainable. Technological and environmental changes have radically transformed the way of doing business. Business transformation into digital business is the key to success in these conditions. On the other hand, some of the previous studies of business transformation in several countries and industries show different empirical evidence. This study analyzes the transformation process in a small-sized family business. This is a case study of 15 small-sized family businesses with four different types of industry, with an interview and observation period of 12 months in 2019–2020. This study has formulated a business transformation model for a small-sized family business and presented the results of the transformation process carried out. The research results indicate that a business transformation model consists of several attributes and sub-attributes. Business transformation results indicate different processes and times between companies. In general, the transformation process can be grouped into the exploration, learning, and synchronizing stages. The industry with the fastest transformation process is the hospitality industry, while the manufacturing process for the industry takes a bit longer. The results of this study indicate that business transformation has improved the sustainability of a small-sized family business that is characterized by its ability to adapt to changing technology and environmental conditions.

scholarly journals Evaluation of harvesting technology of vineyard pruning based on a Mátra wine region case study

2014 ◽  
pp. 91-100
Author(s):  
Cecília Gonda
Keyword(s):  
Best Practice ◽  
Nutrient Supply ◽  
Collection System ◽  
Theoretical Possibility ◽  
Additional Energy ◽  
Local Conditions ◽  
Family Household ◽  
Wine Region ◽  
The Cost

Wineyard pruning utilization for energy purpose is not only a theoretical possibility, the machine background has also been developed. Economic- and environmental experimentations has made by specialists and they seek to developed the best practice in logistics suitable for local conditions and they propagate the results for the potential users. Nevertheless, the utilization does not seem to be typical in Hungary and some other wine-grower countries. For example, in Hungary the additional energy from vineyard pruning eventuates – tillage, nutrient supply; – phy+tosanitary, environmental pollution; – energy management and economic questions. In Hungary the most important problem is practice of the vineyard pruning utilization were mentioned by the users is the establishment of collection system and the high logistic costs as Marczinkó (2007) experiences confirm this. As I experienced in practice, the winegrowers are uninterested in utilization. Most of them burn it at the end of the vineyard in many cases without considering of the relevant statutory prohibition. As my own several years expriment shows at Mátra wine region it is not the technical background which causes the failure. We can use effectively balers or chippers for collection. The cost of chipping is 14 535–27 000 Ft per hectars with the introduced technologies on Mátra wine region. The cost of 1 GJ of heat production is 606–1125 Ft. We can substitute the fuel with vineyard pruning and it means approximately 115 000 Ft saving for a family household per year.

scholarly journals Contrasts in Innovation: Pittsburgh Then and Now

2017 ◽  
Author(s):  
Michael J Madison
Keyword(s):  
Steel Industry ◽  
Large Scale ◽  
Production Model ◽  
Local Conditions ◽  
Industrial Economy ◽  
Industrial Regions ◽  
Post Industrial ◽  
The Relationship ◽  
The City

Assessments of the relationship among law, innovation, and economic growth often begin with one or more propositions of law or law practice and predict how changes might affect innovation or business practice. This approach is problematic when applied to questions of regional economic development, because historic and contemporary local conditions vary considerably. This paper takes a different tack. It takes a snapshot of one recovering post-industrial economy, in Pittsburgh, Pennsylvania, USA. For most of the 20th century, Pittsburgh's steelmakers were leading examples worldwide of American economic prowess. Pittsburgh was so vibrant with industry that a late 19th century travel writer called Pittsburgh "hell with the lid taken off," and he meant that as a compliment. In the early 1980s, however, Pittsburgh's steel economy collapsed, a victim of changing worldwide demand for steel and the industry's inflexible commitment to a large-scale integrated production model. As the steel industry collapsed, the Pittsburgh region collapsed, too. Unemployment in some parts of the Pittsburgh region peaked at 20%. More than 100,000 manufacturing jobs disappeared. Tens of thousands of residents moved away annually. Over the last 30 years, Pittsburgh has slowly recovered, building a new economy that balances limited manufacturing with a broad range of high quality services. In 2009, President Barack Obama took note of the region's rebirth by selecting the city to host a summit of the Group of 20 (G-20) finance ministers. The paper describes the characteristics of Pittsburgh today and measures the state of its renewal. It considers the extent, if any, to which law and the legal system have contributed to Pittsburgh's modern success, and it identifies lessons that this Pittsburgh case study might offer for other recovering and transitioning post-industrial regions.

Accuracy of Static Differential GPS Techniques; Implications for Structural Deformation Monitoring

2009 ◽  
Vol 62-64 ◽  
pp. 31-38
Author(s):  
J.O. Ehiorobo
Keyword(s):  
Carrier Phase ◽  
Reference Frames ◽  
Phase Measurement ◽  
Sampling Rate ◽  
Tall Buildings ◽  
Deformation Monitoring ◽  
Structural Deformation ◽  
Control Network ◽  
Differential Gps ◽  
Engineering Structures

In recent years, the need to monitor for Deformation in Engineering Structures such as Dams, Bridges and Tall buildings have become more necessary as a result of reported failures of many of these structures with catastrophic consequences globally. Global Positioning System (GPS) is highly automated and less labour intensive than other conventional techniques used in structural deformation monitoring. For most applications, such as National Geodetic Control Network, Urban Control Network and other Engineering Control Network, an accuracy in the cm level for most GPS work is quite adequate. For Structural deformation monitoring however, the required accuracy is in millimeters. In this paper, the use of Static Differential GPS method with multiple receivers for high precision measurement was investigated using the monitoring Stations at Ikpoba Dam as case study Scenerio. Four units of LEICA 300 Dual Frequency GPS receivers were deployed for code and carrier phase measurements with observation session of 1hr at a sampling rate of 15 sec. Baseline Processing and Least Squares Adjustment of observation was carried out in WGS 84 and NTM reference frames using the LEICA SKI-PRO Processing software and Move. Analysis of the results revealed that the number of outliers in the observation were <5% and the accuracy of horizontal and vertical coordinates were 4mm maximum for horizontal and 2mm maximum for vertical. The study revealed that in areas with favourable satellite constellation and appropriate reduction or elimination of multipath and other noise like errors, Static Differential GPS techniques with a combination of code and carrier phase measurement gives good results for structural deformation monitoring.

Ambiguity Resolution in ZigBee Phase Shift Measurements Using MAFA Method

2017 ◽  
Author(s):  
Jacek Rapinski ◽  
Slawomir Cellmer ◽  
Joanna Janicka
Keyword(s):  
Phase Shift ◽  
Ambiguity Resolution ◽  
Carrier Phase ◽  
Standard Procedure ◽  
Wave Length ◽  
Functional Model ◽  
Single Wave ◽  
Satellite Positioning ◽  
Phase Data ◽  
Gnss Measurements

This paper presents ZigBee module that is used for ranging in indoor positioning. The system is using the phase shift measurements to determine the distances between user and anchors. The nature of phase shift measurements is causing the results to be in the range of a single wave length. Thus, as in GNSS measurements, appears the problem with ambiguity resolution. In satellite positioning this issue is well described but in range-based ZigBee positioning this problem needs to be solved. The standard procedure to find the correct values of ambiguities is to search for a combination of observation equations with smallest RMS. The authors propose a different solution – the Modified Ambiguity Function Approach (MAFA). It is a method of GNSS carrier phase data processing. In this method, the integer nature of ambiguities is taken into account in the functional model of the adjustment.

A Research of Ecological Farmhouse Design Based on the Sustainable Development Needs

2019 ◽  
pp. 48-68
Author(s):  
Jiangyan Lu ◽  
Yushuai Lang
Keyword(s):  
Sustainable Development ◽  
Rural Areas ◽  
Design Concept ◽  
Rural Life ◽  
Ecological Design ◽  
Design Practice ◽  
Local Conditions ◽  
The Sustainable Development ◽  
Design Requirements

To summarize the problems and needs of the current rural life, identify the pathway that suits the sustainable development of rural areas, and propose the design concept and method that meet the current rural ecological design requirements. Use the organized research approaches. This chapter makes a case study of Nanma Village, provides the theoretical and design practice reference for the rural sustainable development in China, and establishes the knowledge and methodology system that meets the requirements of rural sustainable development. This chapter proposes the design concept and method in line with the current requirements of rural ecological design, suggests that the current village design should be adapted to “local conditions,” and indicates that the harmonious development between human and environment will be a new possible direction for the rural sustainable development and design in future.

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