A relook at rocket radar ground echo data

Statistical analysis of radar data for Aerobee rocke

LaRC Aerothermodynamic Ground Tests in Support of BOLT Flight Experiment

A review is provided of recent aerothermodynamic ground-test contributions by NASA Langley Research Center (LaRC) to the BOLT flight test program. Several test entries into the Langley Aerothermodynamic Laboratory 20-Inch Mach 6 Air Tunnel are discussed. These entries were intended to support the development and design of flight hardware and instrumentation. Some trends and observations from these entries are provided. Also, a comparison of two different global heat transfer test techniques is included and discussed

Feasibility study for power generation off-grid hybrid system in rural area of Ethiopia

Access to electricity is crucial for the community’s socioeconomic development; rural electrification is a critical agenda for developing countries to increase the electricity access rate; due to the scarce settlement of rural communities, grid penetration is limited in Ethiopia. GoE planned to reach 35% of the population with off-grid Technologies. This diploma thesis investigates the design and performance evaluation of an off-grid hybrid power generation system adapted to the energy needs of Wagesho village. The research begins with assessing the energy resources potential for solar and wind energy available in the village, providing a foundation for the subsequent system design and analysis. Load consumption patterns specific to Wagesho village are then analyzed to establish the community's energy requirements. The study comprises two main scenarios: the first scenario involves a hybrid system integrating photovoltaic (PV) panels, a diesel generator (DG), and energy storage batteries, while the second scenario introduces a wind turbine to the mix, forming a PV-DG-Wind-Battery hybrid system, HOMER software is used for optimal components sizing, from the PV-DG hybrid system power generation is achieved with 87% renewable fraction, wind turbine helps to increase renewable fraction to 92.4% by reducing DG operation, and reduces emission which is key for energy sustainability; However, it increases investment cost of the hybrid system because of high initial investment on wind turbine. This paper also studies the calculation of the economic model for both scenarios to see the project's financial feasibility.Access to electricity is crucial for the community’s socioeconomic development; rural electrification is a critical agenda for developing countries to increase the electricity access rate; due to the scarce settlement of rural communities, grid penetration is limited in Ethiopia. GoE planned to reach 35% of the population with off-grid Technologies. This diploma thesis investigates the design and performance evaluation of an off-grid hybrid power generation system adapted to the energy needs of Wagesho village. The research begins with assessing the energy resources potential for solar and wind energy available in the village, providing a foundation for the subsequent system design and analysis. Load consumption patterns specific to Wagesho village are then analyzed to establish the community's energy requirements. The study comprises two main scenarios: the first scenario involves a hybrid system integrating photovoltaic (PV) panels, a diesel generator (DG), and energy storage batteries, while the second scenario introduces a wind turbine to the mix, forming a PV-DG-Wind-Battery hybrid system, HOMER software is used for optimal components sizing, from the PV-DG hybrid system power generation is achieved with 87% renewable fraction, wind turbine helps to increase renewable fraction to 92.4% by reducing DG operation, and reduces emission which is key for energy sustainability; However, it increases investment cost of the hybrid system because of high initial investment on wind turbine. This paper also studies the calculation of the economic model for both scenarios to see the project's financial feasibility

Transparent Aluminum Glass from Blast Furnace Slag

Bibliography: p. 35.The object of this investigation was to find an advantageous method for the disposal of blast furnace slag. As a result of this investigation, a method was developed for the manufacture of a transparent glass from this material. The method consisted of heating together slag, building sand, and soda. The sulphur was removed from the slag and transparency conferred upon the glass by the addition of a small amount of arsenic trioxide. The optimum conditions for carrying out the various steps in the process were determined. The physical properties of the glass were determined and uses were suggested for this material. The production of the glass was carried out on a large laboratory scale and a brief study was made of the probable large scale equipment and cost of manufacture. The use of slag and inexpensive building sand effected a great saving in the cost of the raw materials, permitted the utilization of the waste heat of the melted slag, and gave a glass of superior quality

Feasibility study for power generation off-grid hybrid system in rural area of Ethiopia

This paper studies the feasibility of implementing an off-grid hybrid power generation system, combining renewable energy sources (RES) with diesel generators (DG), for rural electrification in Ethiopia, a case study on the Wagesho village. The study employs a comprehensive methodology involving energy resource potential assessment, load demand estimation, system design, optimal component sizing, and economic analysis. The thesis contains the description of load demand for households and community institutions' energy requirements in the village and wind and solar energy resource assessment using data from the NASA database, showing favorable solar energy potential for the village, whereas wind energy potential is found to be inadequate. Afterward, an optimal hybrid system comprising photovoltaic (PV), diesel generator (DG), and battery storage is designed using HOMER simulation software, with 87.6% of power generation from renewable energy and the remaining 12.4% generated power from DG. Economic analysis is done based on the cash flow model determines the net present value (NPV) using national grid electricity tariffs. The minimum electricity selling price calculated for the designed off-grid hybrid system is 10.98 Birr/kWh ($0.19 /kWh) which is found to be higher than the grid tariff. However, GoE is planned to achieve 35$ 0.19 /kWh) which is found to be higher than the grid tariff. However, GoE is planned to achieve 35% of rural electrification through standalone solar home systems and mini-grids. Implementing this project for the calculated price will give the required rate of return for investors and considering the socio-economic benefits the community in the village will get from this project justify the investment

Fuel Briquettes from Southern Pine Sawdust

"May 1930." Also issued as author's thesis (Ph. D.)--Columbia University, 1929. Includes bibliographical references (p. 29-30).The object of this investigation was to find a method for the profitable disposal of the large amounts of wood wastes from the saw mills of our Southern States. As a result of this investigation, a process has been developed for the manufacture of a high grade fuel briquette involving the following steps: 1. The wood waste in the form of sawdust, is preheated to destroy the elasticity of the wood. This preheating also eliminates moisture and considerable combined oxygen and hydrogen from the wood with the result that the weight is decreased about one-third and the heating value per pound almost doubled. 2. The preheated sawdust is then moistened and briquetted hot without addition of a binder. The resulting briquettes are firm and strong enough to stand rough handling and they resist weathering to an extent which should permit shipment and storage if protected from rainfall. 3. The optimum conditions of carrying out the various steps in the process have been determined and a study made of costs of plant and operation for a 20 ton per day plant

High Grade Decolorizing Carbon from Extracted Cotton Seed Hulls

Bibliography: p. 29.The object of this investigation was to find a method for the profitable disposal of the large quantity of residual cotton seed hulls resulting from the extraction of xylose from cotton seed hulls. As a result of this investigation, a process was developed for the manufacture of a high grade decolorizing carbon involving the following steps: (a) The residual or extracted hulls after air drying were mixed with lime and heated to 1800°F. The lime reduced the quantity of gases absorbed by the carbon. Air may or may not be added during this step. (b) After cooling, the lime was dissolved with hydrochloric acid. (c) After washing, the carbon was activated by air. This involved passing air into the carbon at 1600°F. The resulting carbon was of high quality, one gram of the best grade absorbing more than one gram of iodine from solution. This grade is superior to each of eleven commercial carbons collected from this country and Europe. (d) The optimum condition for carrying out the various steps were determined. (e) The production of the carbon was carried out on a semi-plant scale and a study made of the probable large scale equipment and cost of manufacture