scholarly journals F/H seepage basin groundwater process tank settling characterization task technical plan

1993 ◽  
Author(s):  
J.L. Siler
Keyword(s):  
2006 ◽  
Author(s):  
Lawrence G. Mallon ◽  
Jens Pohl
Keyword(s):  

2006 ◽  
Vol 53 (12) ◽  
pp. 257-264 ◽  
Author(s):  
M.D. Jensen ◽  
P. Ingildsen ◽  
M.R. Rasmussen ◽  
J. Laursen

Aeration tank settling is a control method allowing settling in the process tank during high hydraulic load. The control method is patented. Aeration tank settling has been applied in several waste water treatment plants using the present design of the process tanks. Some process tank designs have shown to be more effective than others. To improve the design of less effective plants, computational fluid dynamics (CFD) modelling of hydraulics and sedimentation has been applied. This paper discusses the results at one particular plant experiencing problems with partly short-circuiting of the inlet and outlet causing a disruption of the sludge blanket at the outlet and thereby reducing the retention of sludge in the process tank. The model has allowed us to establish a clear picture of the problems arising at the plant during aeration tank settling. Secondly, several process tank design changes have been suggested and tested by means of computational fluid dynamics modelling. The most promising design changes have been found and reported.


Author(s):  
Dioume Sylla ◽  
Bountouraby Balde ◽  
Marcos Pedro Ramos Rodríguez ◽  
Edilio Aldana Pereira ◽  
Alberto Peñalver Romeo

El manejo forestal sostenible debe armonizar los principios económicos, sociales y ambientales en un área, de forma tal que los bienes y servicios del bosque puedan ser utilizados por las presentes y las futuras generaciones. Esta investigación se realizó con el objetivo de contribuir al manejo forestal sostenible del Lote 121 de la Unidad Básica de Producción Forestal Río Mantua, perteneciente a la Empresa Forestal Macurije de la provincia Pinar del Río, Cuba. Para su realización se evaluó la base de recursos presentes y potenciales en el área de estudio, se zonificó el área, se proyectó el aprovechamiento de los recursos forestales, se analizaron las actividades de protección y se elaboró el plan técnico económico. Entre los principales resultados pueden mencionarse la actualización de la información de cuatro rodales del Lote 121, el cálculo de la existencia de cada uno de los rodales, correspondiéndoles un valor medio de 2 447,88 m3 y la estimación de una producción total de resina de 4 561,30 toneladas. También se obtuvo que el plan de tala debe regirse por el método de tala por madurez y que la rentabilidad a obtener en el área será del 56,51%. Palabras clave: gestión forestal, silvicultura, resina ABSTRACT Sustainable forest management must harmonize economic, social and environmental principles in an area, so that forest goods and services can be used by present and future generations. This research was carried out with the objective of contributing to the sustainable forest management of Lot 121 of the Basic Unit of Forest Production Río Mantua, belonging to the Macurije Forestry Company of the Pinar del Río province, Cuba. For its realization, the base of present and potential resources in the study area was evaluated, the area was zoned, the exploitation of the forest resources was projected, the protection activities were analyzed and the economic technical plan was elaborated. Among the main results can be mentioned the update of the information of four stands of Lot 121, the calculation of the existence of each one of the stands, corresponding them an average value of 2 447.88 m3 and the estimation of a total production of resin of 4 561.30 tons. It was also obtained that the felling plan must be governed by the felling method by maturity and that the profitability to be obtained in the area will be 56.51%. Keywords: Forest management, forestry, resin


2016 ◽  
Vol 11 (1) ◽  
pp. 13-19
Author(s):  
Emina Kopas-Vukašinović ◽  
Margit Savović

AbstractContemporary curricula of preschool education are the result of the improvement of pedagogical and didactic theories. They imply a technical plan with which it is possible to achieve measurable objectives of preschool education. The curriculum is also defined as a tool for quality and equal education for all. It represents a reflection of the time, society and culture in which it exists, but also a model for future society and education. Thus an important research question arises as to what extent we recognize traditional ideas about learning and the development of a preschool child in contemporary preschool programs. Are traditional ideas about educating young children unjustly neglected or do we recognize them in contemporary pedagogical theory even today, at the same time forgetting about the past and declaring them innovations? This paper deals with the starting points for the development of a curriculum. The goal of the research was to determine to what extent can the starting points for the development of preschool children, which have existed in the first preschool programs in Serbia in the late 19th century, be recognized in contemporary preschool programs. A descriptive method was applied as well as a procedure for content analysis of program documents. Research results confirm that the elements of the first preschool programs, which remain relevant until today, can be recognized in contemporary preschool programs. They are related to target orientations, principles and functions of preschool education. However, these ideas are defined as contemporary tendencies, and the fact that they existed in preschool programs that were developed a long time ago is unjustly ignored.


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