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Search Results: 1 - 10 of 63 matches for " RIDWAN AFFANDI "
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Nucleus Pearl Coating Process of Freshwater Mussel Anodonta woodiana (Unionidae)
HAYATI Journal of Biosciences , 2013,
Abstract: The limiting factor which is a weakness of sea water pearl production are high costs, the risk of major business failures and a long coating time. From the issue of freshwater pearls appear to have prospects of alternative substitution for sea water pearl. This present study aimed to evaluate effect of loads (the number and diameter nucleus) on freshwater pearl coating process and the number and size of the appropriate nucleus diameter, to produce the optimum coating thickness of half-round pearls. The research consists of experimental implantation of 2, 4, and 6 nucleus number per individual mussel was maintained by the method stocked in hapa in bottom waters. Observation method and factorial randomized block design used in the study of the influence of the load to the successfulness of pearl coating and the pearl layer thickness. The results showed that A. woodiana can be utilized as a producer of freshwater pearls. In addition, the number of optimum nucleus that can be attached to the mussel A. woodiana was 2 grains/individuals with a diameter of 10 mm. Shells implanted with the optimum nucleus diameter and number of pearls produced the highest layer thickness of 17 m after 9 months cultivation. This result was good enough compared with the layer thickness of sea water pearl production after the same cultivation time.
LIFE-HISTORY TRAITS OF Stethorus gilvifrons (MULSANT) (Coleoptera: Coccinellidae) ON PHYTOPHAGOUS MITES Eutetranychus orientalis KLEIN (Acari : Tetranychidae)
Agrivita : Journal of Agricultural Science , 2012,
Abstract: The research aims to know the life cycle, feeding and mating behavior of predatory beetle S. gilvifrons, and was conducted at entomology laboratory of Assessment Institute for agri-cultural technology Malang - East Java. The treatments involved feeding behavior and capacity of the various instars and imago of S. gilvifrons. The number of mites consumed within 24 hours by each stage of beetle was also recorded. The average voracity of five individual predators for each instar was determined. The result showed that average life cycle of S. gilvifrons feed on E. orientalis was 4.11 + 0.78; 8 + 1.10; 3.83 + 0.41, respectively for egg, larva and pupa. The predator caught the preys from the front side, then chewed and sucked the body contents of adult preys or consumed the whole egg. The feeding capacity was greater in egg-laying than that in non egg-laying females and males. The smallest size of the cage (1.5 cm diameter x 5 cm long) and clear weather were the most preferred situation for S. gilvifrons mating, which usually occurs on the upper leaf surface. The male positioned itself over the female body and extended its aedeagus to reach the female.
Agrivita : Journal of Agricultural Science , 2012,
Abstract: The research is aimed to confirm the potency of several botanical pesticides to be used as natural biological control and to know the most infective stadium of T. kanzawai was done at Pest and Disease Laboratory of Indonesian Tropical Fruits Research Institute from May to August 2009. A factorial completely randomized design was used in this research. Two factors were observed; first, four kinds of botanical pesticides consist of four treatment levels i.e. extracts of neem, soursop, Siam weed leaves and sterilized water as control.The second was the stadia of T. kanzawai that consist of three levels i.e. larva, nymph and adult. The result showed that Siam weed and soursop leaves extracts caused anti-feedent behavior and decreased mobility at five days after treatment. In addition, exoskeleton of treated T. kanzawai darkened from white, yellowish and bright brown. Extracts of Sourshop and Siam weed leaves caused very high mortality (96.67%) of T. kanzawae compared to neem (79.17%). However, there was no significant difference in mortality rates among the four active stadia of T. kanzawai with average mortality range from 65.63% to 79.38%.
Gender and the Labour Market in Ghana: The Relationship in Terms of the Family, the Market and the State  [PDF]
Ridwan Abukari, Ransford Okoe Odai
Advances in Applied Sociology (AASoci) , 2018, DOI: 10.4236/aasoci.2018.84015
Abstract: The phenomenon of sex-segregation in the labour market continues to exist in a growing economy such as Ghana. The sex-based traditional occupational system of the economic sector is deeply rooted in the beliefs systems of the people. And so, the gender division of labour continues to define gender relationship among people in the society. Consequently, gender division of labour finds meaning and interpretation within the labour market in Ghana. However, for some reasons, people do overcome this occupational segregation by engaging in jobs that are by custom not meant for their sexuality. This statement reveals an inherent assumption about gender and the labour market; which needs further reflection and critical analysis. This paper focuses on gender and the labour market in Kumasi (a commercial town in Ghana); focusing on the gender identities, ideologies as well as symbols that affect the whole gamut of the labour market as a gendered institution in Ghana. Similarly, how the labour market interacts in the context of the family and the state respectively, will also be given a fair attention. The argument is categorised into ten steps: first; introduction of the subject matter, second; the region of Kumasi; the unit of analysis, third; methodology, fourth; an overview of the labour market in Ghana, fifth; the mode of entering/gaining access into food vending industry by men, sixth; challenges men face in the food vending industry in Kumasi, seventh; gender in food vending business verses socio-cultural practices, eighth; gender-labour market nexus; implication on the family and the state and finally, what the State, civil society organisations as well as the individuals or groups, need to do to improve this sector are recommended.
Ridwan Yahya
Bumi Lestari , 2010,
Abstract: Based on preliminary researches, stem and branchwood of Paraserianthes falcataria L. Nielsen were suitable as raw material for pulp and paper manufacture. For the whole tree the highest proportion of bark was found in branches and the top of the tree with a value ranging 20 a€“ 35%. Up to now, the pulp industries have spent money to remove bark of P. falcataria branch before pulping. The objective of this study was to know the suitability of branches including bark as raw material for pulp and paper manufacture. Samples were determined for fiber dimension and its derivation. Screened chips were cooked with the Kraft process. Liquor-to-wood-ratio was 4 : 1. Chemical charge was 13.3% NaOH and 6.7% Na2S. The temperature was raised from room temperature to 170 oC for 90 min and kept at this temperature for 90 min. Pulp was washed; then kappa number, screened and rejected pulp, residual of black liquor were determined. Research results showed that pulp branchwood with bark has the values of screened pulp yield, alkali consumption, and kappa number 46.91%; 9,57; and 25.63, respectively. It paper product has the values of breaking length, burst factor, stretch, tensile strength, and opacity 9.94; 83.80; 3.57%; 1,733.34; 6.33 kN/m, and 92.85%, respectively. Based on those results, paper from branchwood with bark meets requirement for book, mimeograph, and photocopy papers.
Developing Image of Higher Education Performance  [PDF]
Uyu Wahyudin, Ridwan El Hariri, Deni Darmawan
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2013, DOI: 10.4236/ijcns.2013.69044

The study focused on Pattern Analysis Relationships between Basic Element Institutional Excellence in Education with a focus of the study: What is the actual profile of the basic elements of excellence of educational institutions, influence leadership, strategic planning, as well as students and focus stakeholders, focus staffs and faculty in order to develop the image Parahyangan University (UNPAR) performance by reference to the Performance Excellence Criteria for Education. The method used a qualitative approach and quantitative approach [1] with two models using qualitative-quantitative approaches, namely: two-phase design, dominant-les dominant design, and mixed methodology design. Respondents and the information in this study are a lecturer and head of the University.

The Effect of Temperature on Synthesis and Stability of Superparamagnetic Maghemite Nanoparticles Suspension  [PDF]
Irwan Nurdin,   Ridwan,   Satriananda
Journal of Materials Science and Chemical Engineering (MSCE) , 2016, DOI: 10.4236/msce.2016.43005
Abstract: Maghemite (γ-Fe2O3) nanoparticles have been synthesized using chemical co-precipitation at a different temperature. Characterizations of the sample were performed by X-ray diffraction (XRD), transmission electron microscopy (TEM), alternating gradient magnetometry (AGM) and thermogravimetryanalysis (TGA). The stability of the maghemite nanoparticles suspension was studied at different pH and time of storage by dynamic light scattering (DLS) and zeta potential measurements. The XRD patterns confirmed that the particles were maghemite. TEM observation showed that the particles have spherical morphology with narrow particle size distribution. The particles showed superparamagnetic behavior with good thermal stability. The increasing of temperature in the synthesis of maghemite nanoparticles produced smaller size particles, lower magnetization, better thermal stability and more stable maghemite nanoparticle suspension.
Affandi,Deni Emilda
Agrivita : Journal of Agricultural Science , 2010,
Abstract: This research aims to know the effect of mulching, sanitation and yellow fluorescent sticky trap application on population fluctuation and critical attack period of thrip on mangosteen which was carried out in a farmer mangosteen orchard in Lima Puluh Kota district, West Sumatra, Indonesia from October 2007 to February 2008. Twenty of plants were used as sampling units. Four plants were used to elucidate the critical period of mangosteen thrip attack that was assessed based on parameter of scar intensity, and sixteen plants were used to study the effects of mulching, sanitation and yellow fluorescent sticky trap on population fluctuation of mangosteen thrips. Each treatment was replicated four times. A completely randomized design was applied and continued with Lowest Significant Different to identity the differences among the treatments. The result showed that critical period of mangosteen thrip was at the 3rd - 10th weeks after fell of calyx. Sanitation combined with application of yellow fluorescent sticky trap reduced percentage and intensity of scars value by 32.83 % and 5.99 %, respectively. The present study implies that knowledge of mangosteen thrip critical attack period and suitable controlling technique are important for the success of thrip control.
Erwin Affandi,Heru Yuniati
Bulletin of Health Research , 2012,
Abstract: Background:The utilization of Rhizopus oligosporus to produce fatty acid omega-3 in liquid substrate has been conducted widely. The content of fat in the palm oil waste in the amount of 5.56/100 gram still has potential to produce fatty acid omega-3. The solid fermentation of tofu waste with R. oligosporus could increase the content of fatty acid up to 34.4% and palm oil waste could increase up to 61.57%. Methods: Sample is collected from the industry of palm-oil. The palm-oil waste is considered as a substrate, and the mold used is R.oligosporus. The waste product is formulated by adding urea and sucrose. In this case, urea is used as the source of N (nitrogen) and sucrose is used as the source of C (carbon). The substrate with nitrogen is called as low-carbon treatment and the substrate with carbon is called as high-carbon treatment. For the controlle we did not add anything. Fermentation is conducted within 7 days on the shaker at room temperature. The product of fermentation was analyzed for the Water, Ash, Fat, and Fatty-Acid Omega-3 contents. Results: This research shows that the water content of the fermentation product decreased and ash content increased. This happened both in the low-carbon treatment and in the high-carbon treatment. The content of fat after fermentation in controlle treatment increased by 6.44%. However, in the low-carbon treatment fermentation, the fat content decreased by 31.14% from the original content. In the high-carbon treatment fermentation, the fat content increased by 31.67%. The content of saturated-fatty acids produced in the high-carbon treatment and low-carbon treatment are as follows: Capric acid (10:0) and lauric acid (12:0) decreased and myristic acid (14:0), palmitic acid (16:0) and stearic acid (18:0) increased, except the myristic-acid in high-carbon treatment decreased . The content of unsaturated-fatty acid in controlle and high-carbon treatment: Oleic acid (18:1), linoleic acid (18:2) and linolenic (18:3) increased. However, all fatty acid in low-carbon treatment decreased, except the linolenic-acid. The conclusion: The fermentation of palm-oil waste with Rhizopus oligosporus mold could increase the content of fat and produce fatty acid omega-3. In addition, the high-carbon substrat could increase the production of unsaturated-fatty acid. Submit : 19-12-2011 Review : 08-03-2012 Review : 12 -03-2012 revisi : 17–4-2012 56 Keywords: liquefied-fermentation, waste product of palm oil, R.oligosporus, fatty acid 0mega-3 Abstrak Latar belakang: Pemanfaatan kapang Rhizopus. oligosporus untuk mengh
Suryana Purawisastra,Erwin Affandi
Bulletin of Health Research , 2012,
Abstract: The high level of blood cholesterol is one of the risk factor for artherosclerotic cardiovascular disease. The number of people suffering from cardiovascular disease as the consequence of their life style, particularly in the city. On the other hand, it was reported that dietary fiber supplementation could inhibit the increase of the blood cholesterol level. One of these dietary fibers known as galactomannan found sufficiently in the residue of coconut kernel. This study was to prove the effect cif this dietary fiber supplementation to the increased level of the blood cholesterol, low-density lipoprotein (LDJ), high-density lipoprotein (HDL), and triglyceride, in the rabbit experiment. The result of the study shown that the effect of supplemention of galactomannan dietary fiber of the coconut kernel to the cholesterol level was in the form of isolated galactomanan. In 26 days, the isolated galactomannan reduced the cholesterol level by 12 mg/dl (p=0.069), 10 mg/dl (p=0.231) of the LDL, and 7 mg/dl (p=0.138) of the triglyceride. The HDL level raised 1 mgldl (p=0.021). The inhihitation raises significantly when the supplemetation was continued for 52 days. There were an increase of 24 mg/dl (p=0.010) for cholesterol, 15 mg/dl for HDL (p=0.045), 18 mg/dl (p=0.015) for triglyceride. Whereas the increase of the HDL level remained in 1 mg/dl (p=0.032). The conclusion of this study was that the effect of supplemention of galactomannan dietary fiber contained in the coconut kernel to the cholesterol, trigliseride was in the form of the isolated galactomannan. It could he suggested that the isolated galactomannan produced from the residue of coconut kernel was becoming an alternative food supplementation for reducing the cholesterol level of hyperlipidemia.
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