scholarly journals Study on Type Selection of Relays in Outdoor Terminal Box of Converter Station

2021 ◽  
Author(s):  
Jianying Wu ◽  
Zhen Wang ◽  
Xilin Yan
Keyword(s):  
Relay Selection ◽  
Working Environment ◽  
Key Factors ◽  
Operating Environment ◽  
Type Selection ◽  
Selection Of

The outdoor terminal box of converter station’s complex working characteristics and working environment easily leads to the failure of relays in it. The paper analyzes the key factors in relay selection from the perspectives of the characteristics of the operating environment. By comparing the characteristics of different component materials and structure designs, the paper proposes suggestions of type selection of relays in outdoor terminal boxes of converter stations.

The overview of existing knowledge on medical cannabis plants growing  

2021 ◽  
Author(s):  
Matěj Malík ◽  
Jiří Velechovský ◽  
Pavel Tlustoš
Keyword(s):  
Plant Nutrition ◽  
Modern Medicine ◽  
Essential Elements ◽  
Pharmaceutical Sciences ◽  
Medical Cannabis ◽  
Key Factors ◽  
Factors Affecting ◽  
Cultivation Technology ◽  
Active Substances ◽  
Selection Of

The use of cannabis for medicinal purposes dates back well before the era of modern medicine, but in recent years research into the use of medical cannabis in the medical and pharmaceutical sciences has grown significantly. In European countries, most cannabis plants have been and still are grown for industrial purposes. For this reason, hemp cultivation technology is relatively well researched, while little is known about the key factors affecting cannabis cultivation for medical purposes. The active substances of cannabis plant targeted by this review are called phytocannabinoids. The biosynthesis of phytocannabinoids is relatively well understood, but the specific environmental factors that influence the type and number of phytocannabinoids have been much less studied. Indoor or greenhouse cultivation, which uses automated lighting, ventilation, irrigation systems and complex plant nutrition has become much more sophisticated and appears to be the most effective method for producing medical cannabis. There are many different cultivation systems for cannabis plants, but one of the essential elements of the process is an optimal plant nutrition and selection of fertilisers to achieve it. This review summarises the existing knowledge about phytocannabinoid biosynthesis and the conditions suitable for growing plants as sources of medical cannabis. This review also attempts to delineate how nutrient type and bioavailability influences the synthesis and accumulation of specific phytocannabinoids based on contemporary knowledge of the topic.  

Opportunity zones: Do tax benefits go to the most distressed communities?

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
James R. Barth ◽  
Yanfei Sun ◽  
Shen Zhang
Keyword(s):  
African American ◽  
Family Income ◽  
Tax Incentives ◽  
Poverty Rate ◽  
Key Factors ◽  
Median Family Income ◽  
Content Type ◽  
Explanatory Factors ◽  
Tax Benefits ◽  
Selection Of

Purpose The exact criteria used by state governors for choosing opportunity zones (OZs) are not publicly available. This paper aims to examine whether state governors selected the most distressed communities, or those with the highest proportions of minorities, as OZs. Design/methodology/approach This paper compares the distressed communities chosen as OZs in states throughout the country to an equal number of those eligible distressed communities but not selected. Moreover, this paper uses regression analysis to determine whether the poverty rate, median family income, population, percentage of population that is minority and the percentage of population that is African American are significant explanatory factors in the choice of OZs. Findings After describing the tax incentives for investing in OZs, this paper documents that governors did not select many of the most distressed communities, or those with high proportions of minorities, in their individual states. Originality/value This paper describes in some detail the way in which investors may generate tax benefits by investing in eligible property or businesses in OZs. It also examines the extent to which the degree of poverty and the percentage of the population that is minority (and African American) were key factors in the selection of OZs. It arises an issue that the chosen communities are not necessarily those most in need of more investment or those heavily populated by minorities, particularly African Americans.

Basking Site Selection and Usage Strategies of the European Pond Turtle, Emys orbicularis (Linnaeus, 1758) in Babat valley (Gödöllő, Hungary)

2021 ◽  
Vol 28 (4) ◽  
pp. 175-184
Author(s):  
Gergő Erdélyi ◽  
Borbála Szabó ◽  
István Kiss
Keyword(s):  
Site Selection ◽  
Habitat Characteristics ◽  
Freshwater Turtles ◽  
Emys Orbicularis ◽  
Pond Turtle ◽  
Site Type ◽  
Type Selection ◽  
Body Sizes ◽  
Negative Effect ◽  
Selection Of

Sun basking is the most common method for freshwater turtles, such as the European pond turtle, to maintain optimal body temperature. The attributes of the macro- and microhabitat features around the basking sites affect the basking site selection of the European pond turtle. To protect the European pond turtle, it is important to know the basking habits among the biological characteristics of the species, along with the effects of the habitat characteristics and the choice of the type of basking sites. The purpose of our research was to detect the effects of macro- and microhabitat features on the selection of basking sites. We wanted to determine basking site type selection according to the carapace length classes and if there is any difference in the choice of basking trunks and branches with different thicknesses. Turtles choose basking sites with less closed vegetation in their environment. We have detected seasonal differences in the microhabitat features. The closing reed and Typha sp. had a negative effect on the number of observed basking turtles. The most popular type of basking sites in the pond system was the commonly occurred fallen tree trunks and branches in the water, regardless of turtle body size. Most turtles used thinner tree trunks and branches for basking. In the meantime, we found differences in the choice of basking trunks between the turtles with different body sizes. Younger turtles with smaller bodies appeared in larger numbers on emergent branches with smaller diameters.

A Success Story in Managing and Optimising Gas Lift Wells in Matured Oil Field: Automated Workflows in Digital Fields as Enablers to Accelerate Opportunities Creation and Production Optimisation

2021 ◽  
Author(s):  
Amir Badzly M. Nazri ◽  
W. M. Anas W. Khairul Anuar ◽  
Lucas Ignatius Avianto Nasution ◽  
Hayati Turiman ◽  
Shar Kawi Hazim Shafie ◽  
...  
Keyword(s):  
Model Validation ◽  
Field Performance ◽  
Oil Field ◽  
Working Environment ◽  
Key Factors ◽  
Collaborative Working ◽  
Water Cut ◽  
Integrated Operations ◽  
Collaborative Working Environment ◽  
Gas Lift

Abstract Field S located in offshore Malaysia had been producing for more than 30 years with nearly 90% of current active strings dependent on gas lift assistance. Subsurface challenges encountered in this matured field such as management of increasing water-cut, sand production, and depleting reservoir pressure are one of key factors that drive the asset team to continuously monitor the performance of gaslifted wells to ensure better control of production thereby meeting target deliverability of the field. Hence, Gas Lift Optimization (GLOP) campaign was embarked in Field S to accelerate short term production with integration of Gas Lift Management Modules in Integrated Operations (IO). A workflow was created to navigate asset team in this campaign from performing gaslift health check, diagnostic and troubleshooting to data and model validation until execution prior to identification of GLOP candidates with facilitation from digital workflows. Digital Fields and Integrated Operations (IO) developed in Field S provided an efficient collaborative working environment to monitor field performance real time and optimize production continuously. Digital Fields comprises of multiple engineering workflows developed and operationalized to act as enablers for the asset team to quickly identify the low-hanging fruit opportunities. This paper will focus on entire cycle process of digital workflows with engineer's intervention in data hygiene and model validation, the challenges to implement GLOP, and results from the campaign in Field S.

scholarly journals EXAMINATION OF THE WEED FLORA OF RUDER HABITATS AND THE POSSIBILITY OF SUPPRESSION WITH HERBICIDES

2018 ◽  
Vol 6 (4) ◽  
pp. 329-332
Author(s):  
Milić Vojinović ◽  
Jelica Živić ◽  
Sanja Perić ◽  
Miroljub Aksić
Keyword(s):  
Chenopodium Album ◽  
Working Environment ◽  
Xanthium Strumarium ◽  
Weed Species ◽  
Construction Sites ◽  
Convolvulus Arvensis ◽  
Human Settlements ◽  
Time Of Application ◽  
Vegetation Complex ◽  
Selection Of

Ruderal flora, as well as the vegetation that flora forms, represent an extremely dynamic floristic-vegetation complex and arean integral part of the most immediate living and working environment of human. It is formed and developed mainly in human settlements, as well as in the other anthropogenic environments that are occasionally or permanently under direct or indirect influence of various forms of human activity. Ruderal vegetation is found not only directly around the settlements, but also around all urban and accompanying facilities: along roads, paths and fences around houses, yards, walls and roofs, in avenues, on ruins, construction sites, landfills, along railway tracks, road and defense embankments, on wet and nitrified banks of rivers, near human settlements, in abandoned lawns, on the street walks with sandy areas, cemeteries, in degraded pastures, forests, etc. This essay presents the distribution and representation of economically harmful, invasive and quarantine weed species (Abutilon theophrasti, Agropyrumrepens, Amaranthusretroflexus, Calystegiasepium, Cirsiumarvense, Chenopodium album, Chenopodiumhybridum, Convolvulus arvensis, Cynodondactylon, Daturastramonium, Sonchusarvensis, Sorghum halepense, Xanthium strumarium…) at ten sites in the Nisava district. The assessment of species representation was done in two shootings (May and August) according to scale 1-4. The proper selection of herbicides depends, in a large extent, on the presence of dominant weed species and on the time of application.

scholarly journals Why We Go Where We Go: Profiling User Decisions on Choosing POIs

2020 ◽  
Author(s):  
Renjun Hu ◽  
Xinjiang Lu ◽  
Chuanren Liu ◽  
Yanyan Li ◽  
Hao Liu ◽  
...  
Keyword(s):  
Key Factors ◽  
Real World Data ◽  
Decision Factors ◽  
Point Of Interest ◽  
Learning Factor ◽  
Poi Recommendation ◽  
Key Factor ◽  
Selection Of ◽  
Decision Structures

While Point-of-Interest (POI) recommendation has been a popular topic of study for some time, little progress has been made for understanding why and how people make their decisions for the selection of POIs. To this end, in this paper, we propose a user decision profiling framework, named PROUD, which can identify the key factors in people's decisions on choosing POIs. Specifically, we treat each user decision as a set of factors and provide a method for learning factor embeddings. A unique perspective of our approach is to identify key factors, while preserving decision structures seamlessly, via a novel scalar projection maximization objective. Exactly solving the objective is non-trivial due to a sparsity constraint. To address this, our PROUD adopts a self projection attention and an L2 regularized sparse activation to directly estimate the likelihood of each factor to be a key factor. Finally, extensive experiments on real-world data validate the advantage of PROUD in preserving user decision structures. Also, our case study indicates that the identified key decision factors can help us to provide more interpretable recommendations and analyses.

Comparative analysis of straight grate machines and combined facilities grate-tubetype kiln-cooler for selection technologies of pellets production

2021 ◽  
Vol 77 (8) ◽  
pp. 957-968
Author(s):  
A. A. Butkarev ◽  
E. A. Butkareva
Keyword(s):  
Comparative Analysis ◽  
Iron Ore ◽  
High Efficiency ◽  
Electric Energy ◽  
Iron Ore Pellets ◽  
Electric Energy Consumption ◽  
Ore Pellets ◽  
Type Selection ◽  
Cost Of Energy ◽  
Selection Of

At present, mainly straight grate machines (SGM) and combined facilities grate-tube-type kiln-cooler (GKC) are used for heat-strengthening induration of iron ore pellets. Their total share in the produced iron ore pellets in the world accounts for 93%, of which SGM takes 60% and GKC – 33%, which speaks about high efficiency of both methods of induration. At the same time, when making decision on construction a pelletizing plant, a question of selection of most effective technology of iron ore pellets production by SGM and GKC often arises. Results of comparative analysis of efficiency of technologies of iron ore pellets production by SGM and GKC presented. Features of various ore types pellets induration considered as well as possibilities of ensuring the required quality of finished pellets at application for induration SGM and GKC. Data on maximum productivity of the considered induration facilities, amount of dust, fines formation, emissions of harmful substances into environment and electric energy consumption presented. Importance of a possibility of accounting of fuel type selection, of heat expenses for heat treatment, of expenses for maintenance, capital and operation costs were noted. It was shown that choice of a particular variant of technology should be done at the stage of elaboration feasibility study accounting existing experience of facilities running, availability of fuel types, cost of energy resources, climate zone and assembling solutions.

Ownership, Incentives and Regulation of CCP Risks

2016 ◽  
pp. 272-303
Author(s):  
Louise Carter ◽  
Jennifer Hancock ◽  
Mark Manning
Keyword(s):  
Risk Management ◽  
Financial Market ◽  
International Standards ◽  
Key Factors ◽  
Operating Environment ◽  
Cross Border ◽  
Factors Influencing ◽  
Emerging Trends ◽  
Central Counterparties

This chapter develops a framework to analyse the factors influencing central counterparties' (CCPs') risk controls and the role of regulation. The framework illustrates the importance of sound regulation of CCPs and helps to explain why different CCPs may make different risk management choices. Key factors include ownership, governance and the profile and preferences of participants. International standards for the design and operation of CCPs and other financial market infrastructures (FMIs) are reflected in the Principles for Financial Market Infrastructures (PFMIs). Modelling key elements of these standards, the chapter demonstrates the importance of a flexible regulatory framework that achieves the desired level of stability while allowing the mix of risk controls applied by each CCP to vary according to its particular incentives and operating environment. The chapter goes on to discuss the emerging trends towards competition and interoperability between CCPs and cross-border provision of clearing services, and consider the implications for CCPs' risk management choices.

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