https://journals.aijr.in/index.php/ajgr/issue/feed Advanced Journal of Graduate Research 2019-10-20T14:06:30+00:00 Adv. J. Grad. Research ajgr@aijr.in Open Journal Systems <p align="justify"><a title="Click for Journal homepage" href="https://doi.org/10.21467/ajgr" target="_blank" rel="noopener"><img style="float: right; padding-left: 15px; padding-right: 5px;" src="/public/site/images/aabahishti/AJGR_Cover_Page.jpg" alt="AJGR"></a>Advanced Journal of Graduate Research is a multidisciplinary, international journal featuring the work of graduate students and young researchers. This journal seeks to disseminate the work of emerging students who focus on scientific/technical content, regardless of their academic discipline.&nbsp;<em>Adv. J. Grad. Res.</em> publishes research carried out by graduate students and young researchers (Bachelor degree students and Master degree students) that sound&nbsp;scientifically and technically valid. This journal will serve as a global platform to broadcast new research initiatives being carried out by today’s brightest youths as part of their graduate project.<br>Advanced Journal of Graduate Research is published by AIJR publisher (India) and registered with CrossRef with doi: 10.21467/ajgr&nbsp;and ISSN of this journal is &nbsp;2456-7108 [online].</p> https://journals.aijr.in/index.php/ajgr/article/view/1931 Effect of Salinity Difference on Lipid Content from Chaetoceros muelleri on Continuous Reactors 2019-10-20T13:59:11+00:00 Arif Rahmadi reaverahmadi@gmail.com Yeni Mulyani yeni.chem@gmail.com Muhammad Wahyudin Lewaru mw.lewaru@gmail.com <p><em>Chaetoceros muelleri</em> is a microalgae class of <em>Bacillariophyta (diatom)</em> which is generally only used as feeds for fishes and shellfish larvae. Nevertheless, the biochemical content of this species is quite high and has the potential to be developed. This research aims to explain the effect of different salinity on the growth and lipid content of <em>Chaetoceros muelleri</em> cultured in a continuous photobioreactor. This research was carried out in August 2018 - February 2019. The research was conducted at the Laboratory of Marine Microbiology and the Laboratory of Bioprocess and Bioprospection of Natural Materials, Faculty of Fisheries and Marine Sciences, Padjadjaran University. The samples of <em>Chaetoceros muelleri</em> isolates were obtained from the Jepara Brackish Water Aquaculture Center. The methods used for the study was a ‘Completely Randomized Design’ (CRD) with four treatments. The salinity used is 15, 25, 35 and 45 ppt. The main parameters observed were growth and lipid content, while the supporting parameters were temperature, and pH. The results of this study showed that the highest lipid content was a salinity treatment of 35 ppt with a value of 25.37% of total dry weight obtained at the end of the culture. Based on growth, the highest density occurred in 25 ppt salinity with a maximum density of 3.80 ± 0.49 x 106 cells. ml-1 and maximum growth rate of 0.36 ± 0.008 div. day-1</p> 2019-08-31T08:12:04+00:00 ##submission.copyrightStatement## https://journals.aijr.in/index.php/ajgr/article/view/2000 A Numerical Calculation of Arbitrary Integrals of Functions 2019-10-20T10:43:14+00:00 John Ojima Mamman mammanojima@gmail.com Terhemen Aboiyar t_aboiyar@yahoo.co.uk <p>This paper presents a numerical technique for solving fractional integrals of functions by employing the trapezoidal rule in conjunction with the finite difference scheme. The proposed scheme is only a simple modification of the trapezoidal rule, in which it is treated as an algorithm in a sequence of small intervals for finding accurate approximate solutions to the corresponding problems. This method was applied to solve fractional integral of arbitrary order α &gt; 0 for various values of alpha. The fractional integrals are described in the Riemann-Liouville sense. Figurative comparisons and error analysis between the exact value, two-point and three-point central difference formulae reveal that this modified method is active and convenient.</p> 2019-10-20T10:43:14+00:00 ##submission.copyrightStatement## https://journals.aijr.in/index.php/ajgr/article/view/2068 Mechanical and Physical Properties of Polyester Reinforced Glass Fibre/Orange Peel Particulate Hybrid Composite 2019-10-20T12:01:15+00:00 Rabiu Onoruoiza Mamman rabiumamman87@gmail.com Aliyu Mohammed Ramalan ramalanmohammed@gmail.com <p>This study was focused on the development of hybrid composed using orange peel particulate dispersed in an unsaturated polyester resin reinforced with chopped strands of E-glass fibers. Orange peel particulate of about 350µm sieve size, of varying weight percentage (3, 6, 9,12 and 15) wt.% and E-glass fiber of constant weight percentage 25.1wt% was used as reinforcements in a polyester matrix. The effect of the orange peel particulate on the physical and mechanical properties of the resulting composite such as tensile strength, bending strength, impact strength and hardness strength was investigated. The results showed remarkable improvement in mechanical properties with increase in percentage of particulate reinforcement. Tensile strength varies from 50.0 to 62.6 MPa, Hardness values varies between 28.6 and 40.8HRB, Impact energy at room temperature, varies between 5.0 to 7.4 Joules, as a function of fiber weight fractions and the flexural strength varies from 74.0 to 85.2 MPa. The best mechanical properties were obtained at 15 Wt.% particulate reinforcements. The results of the physical tests show that the water absorption increases as the weight percentage of the particulate reinforcement increases and the same condition also holds for the density.</p> 2019-10-20T12:01:15+00:00 ##submission.copyrightStatement## https://journals.aijr.in/index.php/ajgr/article/view/2060 Analysis of the Weak Soil Behavior, Modified Through Cementation 2019-10-20T14:06:30+00:00 Nadiia Kopiika kopijka.nadija.1999@gmail.com Yuriy Petrenko petrenko_yuri@ukr.net <p>The purpose of the study is to conduct thorough theoretical research and literature overview regarding possible ways of soil stabilization on the basis of this practice increasing demand. In particular an emphasis is made on the chemical technique for weak soils strengthening, due to its prevalence and various practical and economic advantages. Great amount of promiscuous data was analyzed and organized; in addition on its basis an attempt is made to provide convincing calculation technique for further usage in engineering soils` stabilization practice. Besides, various factors which could influence on the results` accuracy are identified with corresponding recommendations for further possible research on this issue.</p> 2019-10-20T14:06:30+00:00 ##submission.copyrightStatement##