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International Journal of Science, Engineering, and Sustainable Technology (IJSESTech)
Published by Universitas Halu Oleo
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
International Journal of Science, Engineering, and Sustainable Technology (IJSESTech) is an open international journal dedicated to the latest advancements in sciences, applied sciences and engineering, as well as relating sustainable technology. The goal of this journal is to provide a platform for scientists and academicians all over the world to promote, share, and discuss various new issues and developments in different areas of sciences, engineering, and technology.
Arjuna Subject : -
Articles 7 Documents
 1 
Microwave Effects on Microstructure of Ceramics Sudiana, I Nyoman; Mitsudo, Seitaro; Inagaki, Shunsuke; Sako, Katsuide
International Journal of Science, Engineering, and Sustainable Technology (IJSESTech) Vol 1, No 1 (2014)
Publisher : International Journal of Science, Engineering, and Sustainable Technology (IJSESTech)

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Abstract

The sintering and microstructure evolution of alumina ceramic sintered by a wide range microwave were investigated. Bulk density were calculated by using Archimedes method while the grain size measurements were used to correlate sintering with grain growth was observed by electron microscope. The microwave effects such as an enhancement of densification and shorter time of processing of microwaves compared to conventional case have been found and reported in previous paper. There was also showed microwave frequency dependency of alumina`s densification.  Unfortunately there is no satisfactory theory to explain the phenomena. However the electric field inside sample during electromagnetic heating is believed as the main factor. In this paper further investigation of microwave effect on alumina properties was reported. The effect of microwave on microstructure of alumina is evaluated.  Grain evolution for each sintering methods were evaluated by using image processing on the scanning electron microscopy’s photos of fracture and grinded surfaces of samples. There showed that microstructure of sintered alumina is dependent on the microwave frequencies. Some possible mechanisms were also discussed.
Size inequality dynamics and allometric model for estimating the self-thinning exponent in overcrowded mangrove Kandelia obovata forest Analuddin, Kangkuso; Sharma, Sahadev; Hagihara, Akio
International Journal of Science, Engineering, and Sustainable Technology (IJSESTech) Vol 1, No 1 (2014)
Publisher : International Journal of Science, Engineering, and Sustainable Technology (IJSESTech)

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Abstract

Size inequality dynamics and allometric model of the self-thinning exponent of a crowded mangrove Kandelia obovata stands were analyzed by using five years data. Size variability and skewness of tree height, H and stem diameter of H, D0.1H, as well as the contributions of H and D0.1H on the tree mass, wT variation were analyzed. The Standard deviation SD of H decreased significantly by the vicinity of zero with stand growth, indicating that the variation of H becomes small as the stands grow, and finally all trees may have a similar height. On the other hand, SD of D0.1H was stable as the stands grew, while, the coefficient of variation CV of H significantly decreased as the stands grew. These results suggest that the size inequalities of H and D0.1H become small as the stands grow. Most of the skewness b1-values of H were negative meaning that most of the frequency distributions of H is J-shaped though stands grow. The self-thinning exponent was well-described by Weller’s allometric model, at which the value of  (8) was the same with  (1). This is because the value of  was nearly equal to 1/3, and the value of  was almost zero. Thus, the present study divulged that the size inequality of crowded mangrove actively self-thinned was dynamics, though their biomass density was significantly constant with the progress of time.
Linear Relation of Two Discrete Signals Cahyono, Edi; Saidi, La Ode; Raya, Rasas; ., Idris
International Journal of Science, Engineering, and Sustainable Technology (IJSESTech) Vol 1, No 1 (2014)
Publisher : International Journal of Science, Engineering, and Sustainable Technology (IJSESTech)

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Abstract

We consider two discrete signals that are discrete functions over time. We introduce a method to approximate one signal in a linear form of the other. The coefficient of the linear expression are obtained by applying a least square method. We present an example by using daily data of exchange rates. If an exchange rate of a currency is in a linear form of the other and there is a time leg, then one may predict the dynamics of a currency based on the dynamics of the other. Investors are interested in predicting the dynamics of exchange rates, stocks and commodity prices, if such prediction exists.
Effectiveness of Antihypertension of Rennin Angiotension Inhibitor on Diabetic Patient with Hypertension Leorita, Mesi; IDP, Pramantara; AE, Nugroho
International Journal of Science, Engineering, and Sustainable Technology (IJSESTech) Vol 1, No 1 (2014)
Publisher : International Journal of Science, Engineering, and Sustainable Technology (IJSESTech)

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Abstract

The combination of diabetes mellitus of type 2 and hypertension will increase risk of microvascular and macrovascular complications. Blood pressure which is controlled suitable to the targeted therapy may reduce the risk. American Diabetes Association (2013) recommended antihypertension of renin-angiotensin inhibitor, namely ACE inhibitor and angiotensin II receptor blockers, in order to control blood pressure of the patient of diabetes mellitus of type 2 and hypertension. The purpose of this study is to determine the effectiveness of the antihypertension of the renin-angiotensin system through two parameters, namely a) the percentage of therapeutic target attainment according to the JNC 8; and b) the value of blood pressure reduction. The study carried out by using a method of retrospective cohort study. The data were collected from the medical records of patient suffering both diabetes and hypertension at the Internal Disease Clinic of PKU Muhammadiyah Hospital, Yogyakarta. Descriptive analysis was conducted to determine the general characteristics of the patients. Bivariant analysis was carried out to determine three aspects, those are: 1) the profile of each of the antihypertension used (i.e., ACE inhibitors and angiotensin II receptor blockers) in inhibiting the renin angiotensin system, 2) the achievement (in %) of blood pressure treatment targets according to JNC 8, and 3) the value of blood pressure reduction. From 108 patients involved in this study, we obtained 117 patients who used antihypertension, consisting of 65 patients who used ACE Inhibitors and 52 patients who utilized angiotensin II receptor blocker. The average value of blood pressure reduction from the users of the ACE inhibitor is 20.55 ± 16.57 mmHg, while from the users of angiotensin II receptor blocker is 20.42 ± 15.41. We obtained that statistically the effectiveness of the two antihypertension groups of the renin-angiotensin inhibitors was the same.
Upgrading Traditional Techniques of Food Fermentation: Kabuto-Making Susilowati, Prima Endang; ., Sanatang; Safitri, Meilani; Raharjo, Sapto
International Journal of Science, Engineering, and Sustainable Technology (IJSESTech) Vol 1, No 1 (2014)
Publisher : International Journal of Science, Engineering, and Sustainable Technology (IJSESTech)

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Abstract

The capacity to preserve food is directly related to the level of technological development. The slow progress in upgrading traditional food processing and preservation techniques in Sulawesi Tenggara contributes to food and nutrition insecurity in the sub-region. Simple, low-cost, traditional food processing techniques are the bedrock of small-scale food processing enterprises that are crucial to rural development in Sulawesi Tenggara. While a lot still needs to be done, some successes have been achieved in upgrading traditional sulawesi Tenggara food processing technologies including the mechanization of kabuto (fermented cassava meal) processing.
Interpretation of GPR Field Data by Using Forward Modeling ., Arisona; Mohd Noordin, Mohd Nawawi; J, Safani; Safiuddin, L.O.
International Journal of Science, Engineering, and Sustainable Technology (IJSESTech) Vol 1, No 1 (2014)
Publisher : International Journal of Science, Engineering, and Sustainable Technology (IJSESTech)

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Abstract

The forwad modeling using the Reflex software of ground penetrating radar (GPR) to  minimize misinterpretation in the identification of subsurface material GPR data has been carried out.  The misinterpretation may be caused by the multple and noise due to non-ideal condition of materials beneath the Earth surface. By forwad modeling, the multiple and noise can be reduced, that is by taking the dominant material as homogeneous or ideal condition. A profile/cross section model of the soil layer, the absorption properties of electromagnetic waves, is considered. The result showed that the response given through the forward modeling approached the lithology form of gold quartz vein with a slope of  600. Comparison to a field model shows a good accuracy of the forward modeling.
Technology of Brown Coal Briquette for High Calorie Alternative Fuel Jahiding, M.; ., Mashuni; Hasan, E.S.; ., Hajerayani
International Journal of Science, Engineering, and Sustainable Technology (IJSESTech) Vol 1, No 1 (2014)
Publisher : International Journal of Science, Engineering, and Sustainable Technology (IJSESTech)

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Abstract

The study of brown coal briquettes quality as an alternative high calorie fuel has been carried out. Briquettes were made using starch, cassava starch, and castor oil plant starch adhesives. Adhesive compositions varied by 5%, 10%, and15% of the total weight of the samples. The size of the powder granules of the brown coal was 0.25 mm (60 meshes). Samples were casted in cylindrical molds with a diameter of 2.5 cm and 6 cm at high compaction pressure of 100 kg/cm2. Coal briquette quality testing covered the parameters of water content, ash content, volatile matter, fixed carbon and calorific value. The results showed that the brown coal briquette with the highest calorific value was obtained in the adhesive composition ratio of 15% for these types of adhesives starch i.e. 4678.68 cal/gram.  Adhesives that provide the highest calorific value were that of the starch composing 15%

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