UCG Research Papers - Academia.edu (original) (raw)

ABSTRACT The aim of this study is to assess the pharmacological and phytochemical aspects of the Pedalium murex (Linn) (P. murex) and its traditional medicinal uses of different parts of the plant. Flavonoids, phenolic compounds,... more

ABSTRACT
The aim of this study is to assess the pharmacological and phytochemical aspects of the
Pedalium murex (Linn) (P. murex) and its traditional medicinal uses of different parts of
the plant. Flavonoids, phenolic compounds, glycosides, carbohydrates, reducing sugars,
phytosterols, tannins, triterpenoids, alkaloids, xanthoproteins, aromatic oil, stable oil, saponins
and resins are the main phytochemical groups that have been found in different chemical
extracts of P. murex. Pharmacological activities of P. murex have proven its importance for
medicinal uses. This review will be helpful to create interest to use P. murex for developing
new formulation in therapeutic medicines

Resumo: O Conteúdo Gerado pelo Usuário (CGU) tem adquirido significativa importância como fator decisório no processo de compra de produtos e serviços turísticos via Internet, bem como na escolha por destinos turísticos. Para este... more

Resumo: O Conteúdo Gerado pelo Usuário (CGU) tem adquirido significativa importância como fator decisório no processo de compra de produtos e serviços turísticos via Internet, bem como na escolha por destinos turísticos. Para este trabalho foi utilizada a Teoria do Comportamento Planejado (TCP) para analisar o uso de Comentários de Viagem na Internet (CVI), como fator influenciador na intenção de escolha de um destino de viagem. Trata ‑se de uma pesquisa quantitativa e descritiva ‑exploratória, com um levantamento de dados do tipo survey com 120 pessoas, cujos resultados foram analisados através da Modelagem de Equações Estruturais com a técnica Partial Least Squares. Verificou ‑se que a utilização de CVI pode influenciar a intenção de escolha de um destino turístico para as pessoas que planejam viagens online. Palavras‑chave: Turismo; Internet; Conteúdo gerado pelo usuário; Comentários de viagem na internet. Online Travel Reviews: Factors that influence the intention process of choosing a travel destination Abstract: User ‑Generated Content (UGC) has been acquired significant importance as a decisive factor in the process of purchasing tourism services and products via Internet, as well as the choice of tourist destinations. For this research, it was used the Theory of Planned Behavior (TPB) to analyze the use of Online Travel Reviews (OTR) as a factor influencing the intention of choosing a travel destination. It is a quantitative and exploratory ‑descriptive research with a survey type data collection with 120 people, whose results were analyzed by Structural Equation Modeling with the Partial Least Squares technique. It was found that the use of OTR can influence the intention of choosing a tourist destination for people who plan trips online.

This paper presents the outcome of a feasibility study on underground coal gasification (UCG) combined with direct carbon dioxide (CO2) capture and storage (CCS) at a selected site in Bulgaria with deep coal seams (>1,200 m). A series of... more

This paper presents the outcome of a feasibility study on underground coal gasification (UCG) combined with direct carbon dioxide (CO2) capture and storage (CCS) at a selected site in Bulgaria with deep coal seams (>1,200 m). A series of state-of-the-art geological, geo-mechanical, hydrogeological and computational models supported by experimental tests and techno-economical assessments have been developed for the evaluation of UCG-CCS schemes. Research efforts have been focused on the development of site selection requirements for UCG-CCS, estimation of CO2 storage volumes, review of the practical engineering requirements for developing a commercial UCG-CCS storage site, consideration of drilling and completion issues, and assessments of economic feasibility and environmental impacts of the scheme. In addition, the risks of subsidence and groundwater contamination have been assessed in order to pave the way for a full-scale trial and commercial applications. The current research confirms that cleaner and cheaper energy with reduced emissions can be achieved and the economics are competitive in the future European energy market. However the current research has established that rigorous design and monitor schemes are essential for productivity and safety and the minimisation of the potential environmental impacts. A platform has been established serving to inform policy-makers and aiding strategies devised to alleviate local and global impacts on climate change, while ensuring that energy resources are optimally harnessed.

Underground coal gasification is currently being considered as an economically and environmentally sustainable option for development and utilization of coal deposits not mineable by conventional methods. This emerging technology in... more

Underground coal gasification is currently being considered as an economically and environmentally sustainable option for development and utilization of coal deposits not mineable by conventional methods. This emerging technology in combination with carbon capture and sorptive CO2 storage on the residual coke as well as free-gas CO2 storage in the cavities generated in the coal seams after gasification could provide a relevant contribution to the development of Clean Coal Technologies. Three hard coals of different rank from German mining districts were gasified in a laboratory-scale reactor (200 g of coal at 800 °C subjected to 10 L/min air for 200 min). High-pressure CO2 excess sorption isotherms determined before and after gasification revealed an increase of sorption capacity by up to 42%. Thus, physical sorption represents a feasible option for CO2 storage in underground gasification cavities.

Underground coal gasification (UCG) represents a technology, which can mining coal from a difficult to access coal deposits and coal beds with tectonic faults. This technology is also less expensive than conventional coal mining. In UCG... more

Underground coal gasification (UCG) represents a technology, which can mining coal from a difficult to access coal deposits and coal beds with tectonic faults. This technology is also less expensive than conventional coal mining. In UCG can be measurable a lot of process variables with a common measuring devices and techniques but there are a variables that can not be mesured so easily e.g. underground temperature. On the other hand, it is also necessary to know in advance what will be on the output from the process at different input operating parameters. This paper research the possibility of utilization support vector machines (SVMs) in order to UCG data prediction (i.e. syngas calorific value or underground temperature). In machine learning, support vector machines are supervised learning models with associated learning algorithms that analyze data used for classification and regression analysis. Provided result were obtained with utilization of Matlab and its statistical toolbo...

Facing the ongoing depletion of traditional energy ressources underground coal gasification (UCG) with combined CO2 storage is a sustainable approach with positive economic potential (KEMPKA et al. 2009). Industrial UCG applications focus... more

Facing the ongoing depletion of traditional energy ressources underground coal gasification (UCG) with combined CO2 storage is a sustainable approach with positive economic potential (KEMPKA et al. 2009). Industrial UCG applications focus the production of a high calorific ...

Facing the ongoing depletion of traditional energy ressources underground coal gasification (UCG) with combined CO2 storage is a sustainable approach with positive economic potential (KEMPKA et al. 2009). Industrial UCG applications focus... more

Facing the ongoing depletion of traditional energy ressources underground coal gasification (UCG) with combined CO2 storage is a sustainable approach with positive economic potential (KEMPKA et al. 2009). Industrial UCG applications focus the production of a high calorific ...

The world-wide coal reserves can satisfy the world's primary energy demand for several hundred years. However, deep coal deposits with seams of low thickness and structural complexity do currently not allow an economic exploitation of... more

The world-wide coal reserves can satisfy the world's primary energy demand for several hundred years. However, deep coal deposits with seams of low thickness and structural complexity do currently not allow an economic exploitation of many deposits. Here, underground coal gasification (UCG) can offer an economical approach for coal extraction. The intended overall process relies on coal deposit exploitation using directed drillings located at the coal seam base and the subsequent in situ coal conversion into a synthesis gas. The resulting synthesis gas is used for electricity generation in a combined cycle plant at the surface. A reduction of the CO2 emissions resulting from the combined process is realized by subsequent CO2 capture and its injection into the previously gasified coal seams. The scope of the present study was the investigation of UCG-CCS competitiveness on the European energy market and the determination of the impacting factors. For that purpose, a modular model for calculation of UCG-CCS electricity generation costs was implemented and adapted to the most relevant process parameters. Furthermore, the range of energy supply coverage was estimated based on different German energy generation scenarios.