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Search Results: 1 - 6 of 6 matches for " RADITE TISTAMA "
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Physiological and Biochemical Responses to Aluminum Stress in the Root of a Biodiesel Plant Jatropha curcas L.
RADITE TISTAMA,UTUT WIDYASTUTI,DIDY SOPANDIE,AKIHO YOKOTA
HAYATI Journal of Biosciences , 2012,
Abstract: We investigated J. curcas responses to aluminum stress, histochemically and biochemically. Histochemical stainings were observed to analysis aluminum accumulation, lipid peroxidation and the loss of plasma membrane integrity on the surface and tissue of the root apex. Enzymatic analysis was conducted to measure malate content in leaf, root and malate efflux in the medium. We used M. malabathricum as a comparison for Al-tolerance plant. J. curcas root elongation was inhibited by 0.4 mM AlCl3, while M. malabathricum root elongation was inhibited by 0.8 mM AlCl3 treatment. Inhibition of root elongation has high correlation with Al accumulation in the root apex, which caused lipid degradation and cell death. Generally, malate content in J. curcas leaf and root was higher than that in M. malabathricum. In the contrary malate efflux from the root into the medium was lower. J. curcas root has a different pattern compared to M. malabathricum in malate synthesis and malate secretion when treated with a different Al concentration. We categorized J. curcas acc IP3 as more sensitive to aluminum than M. malabathricum.
Analytical study of self-excited vibration on single degree of freedom vibratory-tillage
Soeharsono,Radite PA Setiawan
Journal of Engineering and Applied Sciences , 2010,
Abstract: Analytical and experimental study on vibratory tillage by adding external energy to the tillage tool has been widely conducted. Though this method has been shown to significantly reduce soil resistance, it will, unfortunately, increase the energy consumption excessively. Experimental study on vibratory tillage by self-excited vibration method has also been performed. This method can also reduce soil resistance though not as much as the former. No analytical study of the latter, however, can be found. This paper discusses analytical study of self-excited vibration of tillage-tool on vibratory tillage due to natural excitation of varying cutting forces. The objective of this discussion is to find dynamics parameter of vibratory tillage so the vibration of tillage-tool will be able to reduced draft force required for loosening soil density during tillage operation The Vibration of vibratory tillage was modeled as a vibration with Single Degree of Freedom (SDOF) system. The tillage-tool was connected to an implement by an elliptic spring while the natural excitation of the varying cutting force was modeled as a periodic function, which can be expressed as a Fourier series. The elasticity of elliptic spring and the inertia of tillage tool were optimized such that the tillage-tool vibrates violently around its resonant frequency. This condition decreases both the soils resistance and the draft force required to loosen soil density due to self-exited vibration during tillage operation. The possibility of draft force reduction was investigated further by analyzing time response of the displacement and by analyzing the oscillating pathway of the tine tip.
Getaran Batang Subsoiler Akibat Gangguan Alami dari Variasi Gaya Potong Tanah
Soeharsono Soeharsono,Radite P. A. Setiawan,Tineke Mandang
Jurnal Teknik Mesin , 2008,
Abstract: Analytical and experiment study on vibratory tillage tools by adding an external energy to the tillage tools has been widely applied. This method would significantly reduce soil’s resistance; unfortunately it uses a lot of energy. Self excited vibration phenomenon on vibrating subsoiler has also been shown experimentally reduce soil’s resistance though not as much as the former. However no analytical study of the latter method can be found. This paper present mathematical derivation of shank-subsoiler’s vibration due to natural excitation of varied cutting forces. Shank-subsoiler was modeled as a single degree of freedom; while the natural excitation of varied cutting force was modeled as a periodic function. This paper also discusses the effect of spring’s elasticity to maximum displacement of the tillage-tools. Therefore, the possibility of decreasing the soil-cutting force for loosening soil’s density due to self exited vibration significantly is visualized. Abstract in Bahasa Indonesia: Studi analitis dan eksperimental terhadap penggetaran tillage tools dengan cara memberikan energi mekanis ke tillage tools telah banyak dilakukan. Walaupun metode ini berhasil menurunkan tahanan tanah secara signifikan, namun penggunaannya berakibat pada kenaikan konsumsi energi secara berlebihan. Penggetaran dengan cara menggunakan metode eksitasi sendiri pada subsoiler getar juga telah banyak dilakukan secara eksperimental. Penggetaran dengan cara ini berhasil menurunkan tahanan tanah. Namun, penurunannya tidak sebesar yang dicapai dengan cara sebelumnya. Kendati demikian, studi analitis terhadap penggetaran dengan cara yang kedua ini belum pernah dilakukan. Oleh sebab itu, pada makalah ini akan dibahas tentang penurunan persamaan matematik dari getaran subsoiler shank akibat gangguan alami yang timbul karena variasi gaya potong tanah. Getaran subsoiler shank dimodelkan sebagai getaran dari sistem getaran dengan satu derajad kebebasan. Sedang gangguan alami dimodelkan sebagai fungsi periodik. Selain itu pengaruh elastisitas pegas terhadap besar simpangan maksimum dari getaran subsoiler shank juga dibahas pada makalah ini. Berdasarkan persamaan matematik yang telah diturunkan, diungkapkan bahwa pada frekuensi resonansi, subsoil shank akan begetar hebat sehingga diharapkan mampu menurunkan tahanan dan gaya potong yang diperlukan untuk membongkar kepadatan tanah, secara signifikan. Kata kunci: Self excited, vibration, subsoiler shank, tahanan tanah, elastisitas pegas
KARAKTERISTIK KANDUNGAN KIMIA DAN DAYA CERNA TEMPE SORGUM COKLAT (Sorghum bicolor) [Characteristics of Chemical Content and Digestibility of Brown Sorghum Tempeh]
Erni Sofia Murtini*,Arfat Gati Radite,Aji Sutrisno
Jurnal Teknologi dan Industri Pangan , 2011,
Abstract: Brown sorghum (Sorghum bicolor) is rarely used for food product because its protein has lower digestibility compared to other cereals. One factor affecting lower sorghum protein digestibility is anti nutritional effect from tannin and phytic acid. Some processing methods of sorghum have successfully increased protein digestibility, one of them is tempeh fermentation. The aims of this research were to degrade anti nutritional compounds and to increase in vitro protein digestibility of sorghum grain using tempeh fermentation. This research was performed in two steps; preparation of sorghum grain and production of sorghum tempeh. Proximate contents, anti nutritional compounds, and in vitro protein digestibility were tested. The test was applied to each of sorghum tempeh samples every 12 hour until 72 hours of total incubation time. The result of study showed that fermentation process decreased anti nutritional factors such as tannin and phytic acid, and increased in vitro protein digestibility of sorghum grain. The reduction of anti nutritions and increase of in vitro protein digestibility of sorghum grain were time-dependent in the fermentation process. The highest in vitro protein digestibility (79.13%) was observed from 72 hour-fermented sorghum.
The influence of elastic springs and spring orientation on the draft force during tillage operation
Soeharsono,P. A. S Radite,M. Tineke,H. Wawan
Journal of Engineering and Applied Sciences , 2011,
Abstract: This paper discusses the influence of spring elasticity and spring orientation on the draft force during tillage operation. The experiments were conducted in a soil bin with the following dimensions: 1.2 m in length, 0.3 m in width and 0.4 m in depth. The soil used in this experiment was clay loam soil; the depth of the hardpan in the soil bin was 12 to 15 cm with a penetration resistance of 2.75MPa. The depth of the tillage operation was 14 to 17 cm, and the thickness of the hardpan to be tilled was 7 to 10 cm. The tillage tool was connected to a fixed structure using a semi-elliptical spring. The tillage speeds used were 0.158, 0.212 and 0.265 m/s. Two spring orientations were tested: Rear Spring Treatment (RST) and Front Spring Treatment (FST) orientations. In the RST orientation, the draft force raised the elevation of the tillage tool tip, and the draft force caused the tillage tool tip elevation decrease in the FST orientation. Compared to rigid tine, the average draft force in the FST orientation increased up to 73 %, whereas a draft force reduction was found in the RST orientation.
Physical and Mechanical Properties of Palm Oil Frond and Stem Bunch for Developing Pruner and Harvester Machinery Design
Yazid Ismi Intara,Hamdi Mayulu,P.A.S. Radite
International Journal of Science and Engineering , 2013, DOI: 10.12777/ijse.v4i2.4583
Abstract: A development of oil palm pruner and harvester machinery design implemented in the field still faces a problem due to the lack of effective and efficient design which is need to be solved. It was noted that in order to develop the design, an early data and information of physical and mechanical properties of palm oil frond and stem fruits is critically important. The objective of the research was to obtain the physical and mechanical properties of palm oil frond and stem in order to develop the design of pruner and harvester machinery. The result showed that tool machinery was been advantageous by the physical properties of the plant i.e. the total weight of frond and leaf which enable to support the cutting process. The average of total weight of frond and leaf was 16.8 kg. The diagonal cutting trajectory was been more advantageous because of total weight and frond shape toward to the different of the plant tissue area. The measurement result shows that cutting curve follows the time required for cutting. The comparison among cutting curve shows differences in cutting thickness or length. In this case, the thickness is linear with cutting time. Besides, those curves show differences at the height which determine the maximum value of tested material cutting resistance. Alternative solution for machinery development design is pruner-harvester for height plant below 6 m and among 6 to 12 m. For below 6 m, pruner-harvester was designed by incorporating motor as power source and cutter-disc as the knife cutter. That condition was relied on that estate which was maintenance intensively commonly used cutter-disc. Pruner-harvester above 6 m and up to 12 m was improved based on manual egrek-designed by adding fresh fruit bunch alley supply glide in order to keep the fruits still in intact form. The consideration was based on affectivity and efficiency. It also considers homogenous ecological of palm oil plant which should be maintained to reduce global warming effect. Information obtained in this research could become positive consideration and alternative solution to provide problem solvingat early development design of palm oil pruner and harvester machinery. Doi: http://dx.doi.org/10.12777/ijse.4.2.2013.69-74 [How to cite this article: Intara, Y.I., Mayulu, H., and Radite, P.A.S. (2013). Physical and Mechanical Properties of Palm Oil Frond and Stem Bunch for Developing Pruner and Harvester Machinery Design. International Journal of Science and Engineering, 4(2),69-74. Doi: http://dx.doi.org/10.12777/ijse.4.2.2013.69-74]
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