The objective of this study was to investigate the concentration offour heavy metal elements (Cd, Cu, Pb and Zn) in road dust at the Northern Highway in Abidjan. The concentrations of the heavy metals weredetermined using atomic absorption spectrometer.The results show that the average concentrations of Cu, Zn, Pb and Cd in the dust samples are 409.34, 125.42, 452.84 and 2.2 mg/kg, respectively were higher than their value in the continental crust data.Contaminationlevels were evaluated using contamination factor and the enrichment factor.Results showed that the dust contained significantly elevated heavy metal elements concentrations compared with the background soil. .

KEYWORDS: Heavy Metals, Road dusts, contamination assessment, Abidjan, Côte d'Ivoire

In this study, two things have been done. The first is to evaluate the original data of the osmotic coefficients of NaCl and KBr electrolyte solutions at 25, 60, 70, 80, 90 and 100 °C (Robinson, R. A., Stokes, R.H.: ElectrolyteSolutions, Butterworths, London 1959 p 480), which originated from the experimental measurements of boiling point evaluation of NaCl (Smith, R.P.: J. Am. Chem. Soc. 61, 500–503 1939; Smith, R.P., Hirtle, D.S.: J. Am. Chem. Soc. 61, 1123–1126 1939) and KBr solutions (Johnson, G.C., Smith, R.P.: J. Am. Chem. Soc. 63, 1351–1353 1942), using a linear rule between a dimensionless-thermodynamic potential of solvent and the probability-distribution of water in single electrolyte solution proposed by one of the authors (Fang, Z.: Asian J. Chem. 23, 5384–53922011). The second is to investigate the effects of temperature on the osmotic coefficients of these two electrolyte solutions from 60 to 100°C by means of the optimization method of curve fitting to the results from the linear rule mentioned above. Acquire the osmotic coefficients of both of NaCl and KBr solutions as a function of temperature within 60 to 100 °C with the satisfying results.. .

KEYWORDS: Sodium chloride; Potassium bromide; Single electrolyte solution; Activity; Osmotic coefficient; Temperature influence; Dimensionless-thermodynamic potential; Probability-distribution of water; Modelfor electrolyte solution; Curve fitting

In this work, the Proportional-Integral PI control implemented in a PLL (Phase Tracking Loop) is presented, with the purpose of synchronizing an external phase coming from a renewable energy generation system to the phase of an electrical network.MATLAB ® and PSIM ® software are used to simulate the results obtained. . .

KEYWORDS: Control PI, electrical network, phase tracking loop (PLL), renewable energy generation system.

The present work presents a proposal for the automation of a garbage can, which allows the correct separation of the different types of waste. The container has six compartments contained in a metal base that rotates through a stepper motor according to the waste selected by the push button located on the top of the container. Due to its capacity and composition, the proposal is only applicable to urban environments (home, schools, and museums). . .

KEYWORDS: Automated container, garbage, motorby steps, microcontroller, PIC, SEDEMA.

Plucheaindica is one of herbal plants that is potential for antifertility due to tannin content on its leaves. This study aimed at studying the structural change on spermatozoa of male white mice treated by Plucheaindica tannin. The tannin extraction was on the basis of Lowenthal-Procter method. In practice, there were three sorts of treatments, comprising: (A) administering aquadest to control group; (B) giving pure tannin; and (C) administering Plucheaindica tannin. After 49 days of treatment, spermatozoa were observed by using electron microscope. There were some parameters considered to measure the structure of spermatozoa, i.e. size and shapes of head, neck, and tail. The result indicated that the structure of spermatozoa from the three different treatments were all of uniformity. For that reason, pure and Plucheaindica tannins did not yield significant difference on the spermatozoa structure of male white mice.

KEYWORDS: tannin, antifertility, Plucheaindica.

Summary:Facing the new mission of the educational career nowadays, the lecturers of Hoa Lu University, Ninh Binh have been trying their best in establishing training programs and innovating teaching methods with a view to being successful in mission of training high-quality human resources, conducting research and applying science and technology, to meet the socio-economic development requirements of the province and the country.In particular, the formation of specialized and professional research groups is a matter of particular interest in the school. Because the professional activities in groups will promote the strengths and professional strengths of each lecturer of the faculty. Each lecturer themself with accumulated capacity and experience will have an influence on the group, and at the same time also receive the dialectical influences of friends and colleagues in the unit.......

KEYWORDS: Team working methods, effective team building skills, quality teaching activities, high quality human resource training.

In order to preserve the quality and quality produced in line with SNI requirements, the selling price of Paving Block products on the market must be modified to reflect the composition of the materials used due to the significant rise in Paving Block manufacturing material costs. Whereas, with the growth in cement and sand, a permanent solution must be found so that the price, quality, and quality of the paving blocks stay unchanged. Therefore, there is a plan to solve this issue by reducing the usage of cement, sand, and stone by using FABA (Fly Ash and Bottom Ash) from the Batu Barang PLTU, which has been operating in West Kalimantan. 0.5/0.5. Due to the decreased usage of sand and cement, does the quality of Paving Blocks still meet current standards? The variation 1:3:0.5 has the maximum compressive strength at day 28 = 28.202 Mpa and is classified as B. The greatest absorption = 7.637 % places the material in class B, while the wear value of 0.230 mm/minute places it in class D. Variation 1:4:0.5 has the maximum compressive strength on day 28 ..... .

KEYWORDS: Paving Block, Bottom Ash, Fly Ash, Cement, Sand, Stone, Absorption, and Compressive Strength