OALib Journal
  OALib Journal is an all-in-one open access journal (ISSN Print: 2333-9705, ISSN Online: 2333-9721). It accepts a manuscript for the peer-review processing, typesetting, publication and then allocated to one of the 322 subject areas. The article processing charge for publishing in OALib journal is Only $99. For more details, please contact service@oalib.com. Submit now
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Mar 15, 2021Open    AccessArticle

Chemical Analysis of the Parameters Determining the Quality of a Case of Cement from Cement Sold on the Mbuji-Mayi Markets

Kayembe Meji Jean Pierre, Ntshila Kamaje Alexis, Kabeya Luboya Christophe, Ciamala Mukendi Paul
This study aims to assess the quality of cement used in civil engineering. We have used the following approaches and techniques for data analysis: calcination conydexiométrie gravimetric and photometric. The results show that as regards the content of SO3, MgO, Cao and alkali oxide, the cements are within the limits of the standards required by the Congolese Control Office (OCC). In view of these results, the conclusion is that the cements used in Mbujimayi can be effectively put to s...
Open Access Library J. Vol.8, 2021

Nov 26, 2020Open    AccessArticle

Low Temperature Hydrothermal Synthesis of Biochar from Green Algae and Its Combustion Performance

Ning Xue
The low temperature hydrothermal carbonization reaction of green algae was studied by combining with the low temperature hydrothermal carbonization technology. The hydrothermal carbon was prepared in the temperature range of 180?C - 240?C. The experimental results had been characterized in detail by oxygen bomb calorimeter, synchronous thermal analyzer and infrared spectrum analysis. The effects of reaction time, reaction temperature and salt concentration on hydrothermal carbonization and combu...
Open Access Library J. Vol.7, 2020

Jul 31, 2020Open    AccessArticle

Post Analysis of Proficiency Test Samples Using Nuclear Magnetic Resonance Spectroscopy

Mamta Sharma
Paper describes the Post Nuclear Magnetic Resonance Spectroscopic analysis of proficiency test samples using Phosphorus NMR. In our study two-dimensional 1H-31P NMR method was optimized effectively for identification of Chemical weapon convention related scheduled organophosphorus compounds in the environmental samples provided by OPCW during proficiency test, while second report is on post analysis of proficiency test sample, carried out to reexamine the samples to observe the missed organophos...
Open Access Library J. Vol.7, 2020

Jul 21, 2020Open    AccessArticle

Validation of an Analytical Method Based on High-Performance Liquid Chromatography for the Determination of Retinol in Chicken Liver

Rodrigo Albert Baracho Rüegg, Roberto Dimenstein
Retinol is an unsaturated fat-soluble isoprenoid alcohol. It is essential for the normal functioning of cells, human growth, and development, and it is found in animal sources in the form of palmitate ester. Chicken liver is an excellent source of retinol and is widely used in the diet of people in developing countries to combat Vitamin A deficiency. Several methods for the quantification of retinol in chicken liver have been reported in the literature. Most of them use more than one solvent for...
Open Access Library J. Vol.7, 2020

Jul 06, 2020Open    AccessArticle

Comparison with Crystallization of Calcium and Strontium Carbonates under DPPC Langmuir Monolayers

Zhonghui Xue
In this paper, using Langmuir monolayers of dipalmitoylphosphatidylcholine (DPPC) as template, we have investigated the controlled crystallization of calcium and strontium carbonates to understand the biomineralization process at the inorganic-organic interface better. Although the calcite with a well-oriented (104) crystal plane has been obtained, as for the strontium carbonates, DPPC monolayers have resulted in the formation of the flower-like assemblies of strontianite needles; however, the o...
Open Access Library J. Vol.7, 2020

Jun 15, 2020Open    AccessArticle

Development of an Analytical Method for Determination of Nitrate in Leafy Vegetables Using Ion Chromatography

Douglas Goncalves da Silva, Anaildes Lago de Carvalho, Evanildo de Jesus Araújo, Marcelo Eca Rocha, Bruno Oliveira Moreira, Dhavid Lucas Silva Santos
The presence of nitrate in food in general may indicate a threat to human health. Nitrate can be converted to nitrite, a toxic species, in saliva and in the gastrointestinal tract. This work describes a precise and sensitive method using ion chromatography to determine nitrate (NO-3) in hardwood vegetables. In the proposed method the extraction of the nitrate of the vegetal matrix was carried out in an aqueous medium at a temperature of 70°C. ...
Open Access Library J. Vol.7, 2020

Jun 15, 2020Open    AccessArticle

Quantitative Estimation of Acid and Base from Locally Available Materials by Using Titration Method

Murugan Thirumalai
Purpose: In this paper, the estimation acid and base from locally available materials were studied. The main purpose of this research was to study to implement the use of locally available materials in secondary education especially in developing countries like Tanzania, in case of titration process; then to develop an idea on extracting locally available material (Acid from Lemons and Base from wood ashes) during the titration process in secondary education; and also to impart ability to the st...
Open Access Library J. Vol.7, 2020

May 26, 2020Open    AccessArticle

New Principle of Busbar Protection Based on Active Power and Extreme Learning Machine

Syed Hassan Lal Gilani, Xingxing Dong, Haiyan Xu
In order to improve the reliability of busbar protection, a new fast busbar protection algorithm based on active power and extreme learning machine is proposed. By performing S-transformation on the fault voltage and current traveling wave, the active power amplitude within 0.1 ms after the fault is obtained. Simulate different fault types in the busbar area and build a bus fault feature vector sample set. The intelligent model of fault learning of extreme learning machine is established, and th...
Open Access Library J. Vol.7, 2020

Apr 23, 2020Open    AccessArticle

Toxicity of Binary Mixtures of Phenol, Zinc and Cadmium to Yeast Strains Isolated from Hydrocarbon Impacted Soil

O. R. Nlemolisa, C. E. Nwanyanwu, C. O. Akujobi, F. C. Ihenetu, R. C. Nwokorie, C. C. Obasi, U. N. Kemka, K. H. Uzoho, M. C. Nwoke
Toxicity of zinc, cadmium and phenol and their binary mixtures were determined based on inhibition of dehydrogenase activities of yeasts strains isolated from hydrocarbon impacted soil. The yeasts isolated from the hydrocarbon impacted soil were identified as Saprochaete sp. and Cryptococcus sp. The toxicity of chemicals and their mixtures were evaluated in the concentration range of 0 - 16 mM for phenol, 0 - 5 mM for zinc and 0 - 0.4 mM for cadmium. The binary mixture ratios were evaluated. The...
Open Access Library J. Vol.7, 2020

Mar 24, 2020Open    AccessArticle

Comparative Evaluation of Some Physicochemical Properties on Selected Commercially Available Soaps on the Zambian Market

Christopher Mwanza, Kadango Zombe
The Zambian market has witnessed an impressive upsurge in the production and consumption of a variety of soaps in recent years. However, there is scant, if any, knowledge of the quality and safety of these soaps. In this undertaking, the quality of some selected soaps was evaluated. The soap samples were randomly obtained from various supermarkets. The qualities of soaps were assessed based on the following physicochemical parameters: free caustic alkali (FCA), moisture content (MC), total fatty...
Open Access Library J. Vol.7, 2020


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