Abbreviation: Sci. Res. Essays
Start Year: 2006
Page 1 of 135, showing 20 records out of 2698 total, starting on record 1, ending on 20
DOI: 10.5897/SRE2017.6530[Article Number: CC0DD4366241]
Improper disposal of municipal solid waste is a problem in Brazil, especially in the North, as noted in Araguatins, TO and can lead to environmental contamination caused by heavy metals. This study aims to analyze the occurrence of heavy metals in soil and leachate in the landfill of Araguatins, TO, Brazil. Soil samples and manure were collected at different points and stored in plastic containers for later laboratory... Read more.
DOI: 10.5897/SRE2014.6084[Article Number: CBA160D66156]
In order to investigate the effect of sonication on the fatty acids of alga oil, oil of Chlorella vulgaris was extracted by sonication at 20, 40, 60 and 80 kHz. Oil extracted by refluxing alga cells in n-hexane was used as control. Probable changes in the structures of the fatty acids were investigated using gas chromatography and Fourier transform infrared spectroscopy (FT-IR). The retention profiles of the... Read more.
DOI: 10.5897/SRE2017.6525[Article Number: 9AB281565893]
This study focused on the occurrences and relationships of the Atlantic Cold Tongue (ACT) and the West African Monsoon (WAM) onsets in the Sudano-Sahelian region during 1983-2000. Two simulations (WAFSSTERA and WAFSSTREY) were used to investigate the sensitivity of the Regional Atmospheric Model (MAR) for two different datasets of sea surface temperature (ERA-40 and Reynolds SST datasets). The MAR reproduced the... Read more.
DOI: 10.5897/SRE2017.6516[Article Number: 446F19A65558]
A 3.6 m3 pilot plastic digester for family generation of biogas was designed, constructed and evaluated through physico -chemical studies using 50% cow dung and 50% kitchen wastes. The ash content of waste increased after digestion while the fibre and fat contents of the waste was 5.10 and 1.05% but significantly (p<0.05) decreased to 2.49 and 0.70% after digestion. The carbohydrate content of the waste... Read more.
DOI: 10.5897/SRE2016.6473[Article Number: BA5822C65411]
There is currently great emphasis on research regarding various aspects of energy sources but the question of optimum usage of the energy is equally important. This work seeks to produce an economic computer-aided design of a fire-clay pot based on conditions that give minimum cost per unit of usage time for the consumer. A percentage of energy loss from the fuel to the environment due to inefficiency of the heating... Read more.
DOI: 10.5897/SRE2017.6509[Article Number: 784562965379]
Energy consumption by occupants during utilization phase concerns the increase of global warming potential and a shortage of energy resources. Energy consumption in an effective way decreases the risk of global warming. Use of materials with high embodied energy and embodied carbon in building components may improve the energy performance of the building, but it can ameliorate global warming. The issue of Life Cycle is... Read more.
DOI: 10.5897/SRE2017.6501[Article Number: 6BB6C0165377]
Induction motors are currently used in many industrial applications. Thus, their control techniques have received a lot of interest. An efficient method of induction motor control is the Direct Torque Control (DTC). It is considered particularly interesting since it is independent of machine rotor parameters and requires no speed or position sensors. This paper presents a simulation of a DTC strategy for three-phase... Read more.
DOI: 10.5897/SRE2015.6369[Article Number: C9B95A065375]
The city identity, taking form with pysical, cultural, socio-economical, historical and stylistic factors, carrying peculiar characteristics in each city, formed by the citizens and their lifestyles, constantly developing and reflecting the sustainable urban concept, is a completion of concepts. Urban identity elements, either they are natural or human artifact, are the witnesses of the past and form our cultural... Read more.
DOI: 10.5897/SRE2014.6056[Article Number: AA98A7C65373]
Halophytes are plants that complete their life cycle in saline environments. Halophytes can therefore be viewed as potential gene sources for genetic manipulation of economically important crop plants. In this study the influence of salinity on potential difference (PD) and surface pH of root cortical cells was investigated. The effect of the metabolic inhibitor, potassium cyanide (KCN), on PD of the root cells... Read more.
DOI: 10.5897/SRE2014.5814[Article Number: 3FADC8265368]
In the ongoing phytochemical study, an effort was made to investigate cytotoxicity of various crude fractions of aerial parts of Indigofera heterantha. The results obtained revealed that all the fractions including n-hexane, ethyl acetate, methanol and residue showed brine shrimp (Artemia salina Leach) cytotoxicity activity. The data obtained revealed the medicinal importance of the plant and will help the researchers... Read more.
DOI: 10.5897/SRE2017.6497[Article Number: 5B02E2A64199]
The intensity of the ionizing radiations can be reduced by allowing them to pass through certain materials and such external materials are known as shields. The shielding material is often chosen based on the type and intensity of the radiation. The radionuclides of standard radioactive sources for calibration purpose or therapeutic use, the irradiated components that produce ionizing radiation of high intensity shall... Read more.
DOI: 10.5897/SRE2017.6492[Article Number: 051942D64178]
This paper presents the effect of matrix type on creep behavior at 80% loads of ultimate tensile strength of two laminated composites at different fiber and matrix system. For this, two types of laminated composites were manufactured based on two types of fibers (carbon fabric and glass fabric) with different matrix systems EPOCAST 50-A1 (EP50-A), Epoxy STR (STR) and Epoxy INJ812 (INJ). The tensile and creep behavior of... Read more.
DOI: 10.5897/SRE2016.6475[Article Number: 2C79D5F64071]
The incidence of diseases is on the surge as exemplified by the recent occurrence in West Africa of Ebola Virus (EBOV) and increase of Zika Virus in Brazil. These pathogens have evolved strategies to evade the human immune system and thus continue to be globally important human pathogens. Bioengineering capabilities are on the increase with rapid advances in synthetic biology and allied technologies (nanobiotechnology,... Read more.
DOI: 10.5897/SRE2017.6482[Article Number: E00D64863607]
Route choice is one of the main challenging problems from theoretical and practical viewpoints in the realm of pedestrian behaviour. A prime underlying concern of researchers in this field is to identify criteria or discover principles that pedestrians use to select their routes. Despite the fact that there are infinite possible routes between two given destinations in space, pedestrians in real situations tend to... Read more.
DOI: 10.5897/SRE2016.6459[Article Number: A241D8463605]
Pumping of 82 MCM/yr from Mujib Basin (Eastern Dead Sea), coupled with the 54 MCM/yr recharge rate, has led to diminished groundwater levels and dramatically affects ecosystem services. Climate change compounds these issues by reducing recharge and increasing the ecosystem’s hydrological demand. This paper investigates groundwater resilience to climatic changes in Mujib Basin by modeling resilience for the years... Read more.
DOI: 10.5897/SRE2016.6464[Article Number: B18B64263069]
Wadi Ishe pilot project is a trial project set to illustrate the recharge of runoff and storage in an artificial groundwater reservoir to minimize evaporation losses and as a substitute of water supply for rural arid areas that could be used for stock watering and some agricultural activities. The HEC-Hydrologic modeling System was used to estimate the runoff potential. The model in the research will provide... Read more.
DOI: 10.5897/SRE2016.6392[Article Number: E52CBC063064]
This research presents an experimental study on the Faraday instability in one-dimensional cells filled with a mixture of water and glycerol, and for a range forcing frequency between 10 and 60 Hz. It showed that for a particular forcing frequency, whose value depends on the width of the cell, an anomalous surface oscillation arises, that appears as a large wavelength mode oscillating subharmonically with respect to the... Read more.
DOI: 10.5897/SRE2016.6420[Article Number: A46460062084]
The spectral scheme for spacetime geometry is a totally new framework for quantitatively describing the spacetime geometry in terms of the spectra of a certain elliptic operator (typically the Laplacian operator) on the space in question. The central idea of the framework can be symbolically stated as ``Let us hear the shape of the Universe!" There are several advantages of this framework compared to the... Read more.
DOI: 10.5897/SRE2016.6449[Article Number: 2D2F86961859]
This experiment was carried out in order to evaluate productivity and rates of poultry manure used to amend kerosene oil contaminated soil on 0.18 ha of land. The land area was contaminated with 5% of kerosene oil equivalent to 50,000 mgkg-1 and thereafter the field laid out using randomized complete block design (RCBD) with four treatments of 10, 20, 30 tha-1 of poultry manure and control which were replicated five... Read more.
DOI: 10.5897/SRE2016.6456[Article Number: 5A94F1F61524]
TiN coatings were deposited onto mirror polished stainless steel substrates by reactive DC magnetron sputtering using a pure Ti target and Ar+N2 atmosphere. The deposited TiN coatings were thermally treated in ambient air at temperatures ranging from 500 to 700°C for times between 1 and 16 h. The as-deposited and thermally treated coatings were characterized using glow discharge optical emission spectroscopy, x-ray... Read more.
Page 1 of 135, showing 20 records out of 2698 total, starting on record 1, ending on 20