159 research outputs found
Experimental and Theoritical Analysis of Thermal Properties in Zephyr Bamboo Tali (Gigantochloa Apus Kurz)
Specific heat, thermal conductivity and thermal diffusivity of Bamboo panel are USAble to support the Programming of Design and Planning in the Structure of the Agricultural Building Construction. The Specific heat of Bamboo's fiber, sheet and panel using the method of mixtures varied from 1.585-2.789 J/gr oC, with a mean value of 2.227 J/gr oC in the temperature difference range of 9 ± 0.1oC . It was found it will increase linearly with an increase in the sample temperature. Thermal conductivity values of Bamboo's fiber based on the transient line heat source technique varied from 0.1035 x 10-3-0.1322 x10-3 J/ cm2 sec oC in the sample temperature 22 to 30 oC on thermal diffusivity of bamboo fiber in 22-30 oC was found to be 0.0823 x 10-3J/cm secoC. The sorption Isotherm and the water activity in the bamboo's panel is depend on the chemical composition, glue laminated, additive and the porosity. There are related with the absorbing of the water into the bounded water and the diffusivity of the water in and out the panel. The moisture equilibrium range are 7.89 to 19.22 percent in the control of the circumstances and 11 to 75 % of the environment.relative humidity
Measurement of Transfort Properties for the Dried Layer of Several Food Materials Undergoing Freeze-Drying
The transport properties of several food materials have been presented as fundamental information to determine the drying rate of freeze-drying process. As an example, the measuring method of thermal conductyvity and permeability has been demonstrated for the sample of slices and mashed aplles undergoing freeze drying. Both samples were freeze - dried at constan surface temperatur ranging from -10 to 70 under the usual pressure range of commercial operation. A mathematical model, based on quasi-steady state analys, was formulated and then apllied to the drying data to determine these transport properties for the dried layer of the sample undergoing freeze drying. Values of thermal conductivity were found to be almost the same between sliced and mashed samples. However , the permeability data of mashed aplles were more than 4 timer greather than that sliced aplles
Penyampaian Cerita Sunset Deity Dalam Pameran Multimedia Eksperimental
Setiap storytelling berupaya untuk membawa cerita menemukan audiensnya melalui medium tertentu. Di era perkembangan informasi dan teknologi,storytelling memiliki kesempatan eksplorasi medium-penceritaan baru yang lebih luas – multimedia storytelling. Salah satu inisiator pengembangkonten multimedia di Indonesia adalah Perusahaan perintis bernama Merchant of Emotion– sebuah rumah produksi yang bercita-cita secara konsistenmenerbitkan dan menjual cerita-cerita orisinilnya dalam bentuk franchise. Pada tahun 2014 – 2015 ini, Merchant of Emotion merilis ceritapertamanya bertajuk Sunset Deity. Medium pertama yang dipilihnya adalah Pementasan Teater Multimedia. Untuk melanjutkan upaya storytellingdan franchising dari Sunset Deity ini, kemudian dirancang sebuah pameran multimedia eksperimental yang mengutamakan aspek storytelling
Analisis Eksergi Pengeringan Irisan Temulawak
Temulawak (Curcuma xanthorrhiza Roxb.) merupakan tanaman obat yang simplisianya digunakan sebagai bahan baku pembuatan jamu atau obat tradisional. Pengeringan merupakan proses utama dalam memproduksi simplisia. Untuk menganalisis efisiensi energi suatu proses pengeringan umumnya digunakan hukum termodinamika pertama yang menjelaskan tentang prinsip kekekalan energi. Akan tetapi teori ini mempunyai keterbatasan dalam mengukur penurunan kualitas energi. Untuk mengetahui apakah energi yang digunakan pada proses pengeringan sudah digunakan secara optimal dari sisi kualitas, digunakan hukum termodinamika kedua atau yang dikenal dengan analisis eksergi. Tujuan penelitian ini adalah menentukan efisiensi proses pengeringan lapisan tipis irisan temulawak dengan metode analisis energi dan eksergi. Dalam studi ini, metode analisis energi dan eksergi berdasarkan hukum termodinamika pertama dan kedua telah digunakan untuk menghitung rasio penggunaan energi dan besaran eksergi yang musnah (exergy loss). sehingga efisiensi proses pengeringan irisan temulawak dapat ditentukan secara akurat. Hasil penelitian menunjukkan bahwa kondisi proses pengeringan mempengaruhi rasio penggunaan energi dan efisiensi eksergi pengeringan. Semakin tinggi suhu dan RH pengeringan maka rasio penggunaan energi semakin rendah dan efisiensi eksergi semakin tinggi. Efisiensi eksergi pengeringan temulawak bervariasi antara 96,5%-100% untuk selang suhu 50 oC hingga 70 oC pada RH 40% serta 82,3% - 100% untuk selang RH 20% hingga 40% pada suhu 50 oC
Model Spektrum Radiasi Surya Dan Suhu Di Dalam Rumah Plastik (the Solar Spectrum and Temperature Model in the Plastichouse)
Research has been conducted to develop the solar spectrum and temperature model in the plastic house. The objective of this research is to determine spectrum and temperature optimum in the plastic house. The method was used by field experiment and simulation. Field experiment consist of three treatments. These are first treatment used the plastic Polyethylene (PE) with UV (Ultraviolet) protection (0 %. 6 % and 14 %). The second treament was determined the tilt angle between plastic cover and horizontal planar. The third treatment was flooring by used soil and grass. The expriment reveals that optimum condition for the plastic house that used plastic UV protection 14%, and use grass as the floor. Produce a optimum result in decreasing Tin for 2.9 % in plastic UV 14%, 2.7 % in β= 67o and 5.7 % in using grass as the floor. Spectrum of UV, PAR (Photosintetically Active Radiation) and IR (Infrared) that transmited from PE 14 % plastik 3.0 W/m2. 143.2 W/m2 and 192.8 W/m2 respectively. The other parameter that influence the temperature in plastic house is natural convection coeficient (hi) and ventilation coeficient (hv). For type Hexagonal plastic house hi and hv 1.5 W/m2.C, 50 W/m2.C respectively. For type Tunnel plastic house hi and hv 1.5 W/m2.oC and 55 W/m2.C respectively
Analisis Sistem Antrean Pelayanan Di Kantor Pertanahan Kota Semarang
Kantor Pertanahan Kota Semarang in charge of the land with an area of 373.70 km2 coverage, every day crowded with visitors who want to take care of the land petition. However, the high number of applicants who must be served not proportional to the number of care facilities available to the applicant should enter the waiting list queue or experiencing situation. This situation occurs in almost all counters, namely Counter 1 Land Information, Counter 2 Registration, Counter 3 Payment, and Counter 4 Product Delivery. Therefore, the required analysis is based on the model line system in accordance with the conditions of service which can then be used to address the issue queue. Based on the analysis, the model system is the best line in counter 1 land information (M/M/1): (GD/∞/∞). Counter 2 registration which is divided into 7 sub-counters have a model (M/M/2): (GD/∞/∞) to sub counters 2A, 2B, 2C, 2E/F, 2G, 2H, and the model (M/M/4): (GD/∞/∞) to sub counter 2D. Counter 3 payment (M/M/2): (GD/∞/∞). Counter 4 is the product delivery (M/M/2): (GD/∞/∞)
Aplikasi Limbah Panen Padi Dan Pupuk Kalium Untuk Meningkatkan Hara Kalium Dan Pertumbuhan Serta Produksi Kedelai (Glycine Max (L.) Merrill.)
The research were to evaluate the effect of giving rice waste harvest and potassium fertilizer and its interaction to increasing potassium nutrient, the growth and the production of soybean (Glycine max (L.) Merill.). Already implementeded at gauze house and at laboratory Research and Technology of Agricultural Faculty of North Sumatera University, Medan from April to August 2014. The method used Factorial Randomized Complete Design with two factor and three replicatiosn. First factor is rice waste that is no giving rice waste (J0), straw compost 5 ton ha-1 (J1), straw charcoal 5 ton ha-1 (J2) and husk 5 ton ha-1 (J3) and the second factor is potassium fertilizer or Muriate of Potash (MOP) that is 0 kg ha-1 (K0), 50 kg ha-1 (K1), 100 kg ha-1 (K2), and 150 kg ha-1 (K3). The results showed that the rice waste increase K-exc and the highest by husk 5 ton ha-1 treatment. Potassium also increasing K-exc and the highest by 100 kg ha-1 treatment. Application of rice waste harvest and potassium fertilizer were not effected in soil pH, C-organic, K plant uptake, the growth, and the crop production
Kajian Eksergi pada Mesin Pendingin Adsorpsi Menggunakan Pasangan Silikagel-Metanol
Sistem pendingin adsorpsi merupakan salah satu dari sistem pendingin yang ramah lingkungan, dimana dalam ope-rasinya sistem ini dapat dibangkitkan menggunakan sumber energi terbarukan seperti biomassa ataupun sinar surya. Sistem pendingin adsorpsi yang digunakan dalam percobaan ini menggunakan pasangan silika gel-metanol sebagai absorben dan refrigeran. Tujuan dari penelitian ini adalah mendapatkan kinerja mesin pendingin adsorpsi intermit- ten pasangan silikagel-metanol dan melakukan analisis eksergi pada mesin pendingin adsorpsi intermitten pasangan silikagelÂmetanol. Metode penelitian diawali dengan pengujian terhadap kebocoran pada semua komponen di da- lam sistem pendingin adsorpsi dan dilanjutkan dengan pengujian sistem pendingin adsorpsi menggunakan pasangan silikagelÂmetanol. Suhu tiap komponen yaitu generator, kondensor, evaporator dan pipaÂpipa masukan dan keluaran diukur dengan menggunakan termokopel tipe CÂC yang dihubungan dengan alat perekam suhu. Sedangkan untuk analisis eksergi diawali dengan perancangan model pada masingÂmasing komponen dalam sistem pendingin adsorpsi intermitten. Hasil percobaan menunjukkan nilai kehilangan eksergi yang diperoleh untuk tiap proses dalam sistem pendingin adsorpsi. Nilai kerugian eksergi menggambarkan ketidak efektifan proses transfer energi dalam sistem pendinginan adsorpsi. Rincian hasil yang dicapai dari perhitungan dengan analisis eksergi memberikan data pada generator desorpsi kehilangan eksergi (exergy destroy) sebesar 35.33 Watt (90.57 %). Kondensor memberikan nilai sebesar 0.20 Watt (0.51 %). Evaporator memberikan nilai sebesar 0.07 Watt (0.18 %) dan pada generator adsorpsi memberikan nilai sebesar 3.51 %
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