Judul: Correlation between Group Dynamics and the Success Rate of Urban Farming Technology Dissemination to Farmers in Medan City
Abstrak: Permasalahan utama yang dihadapi oleh petani perkotaan adalah keterbatasan lahan, seperti halnya yang dialami oleh petani di Kota Medan. Oleh karena itu, Dinas Pertanian dan Perikanan Kota Medan melakukan kegiatan diseminasi teknologi mengenai program urban farming. Keberhasilan kegiatan diseminasi teknologi tidak hanya bergantung pada sumber dan materi informasi namun bergantung pada penerima informasi. Penelitian ini bertujuan untuk menganalisis hubungan dinamika kelompok dan tingkat keberhasilan diseminasi teknologi. Penelitian ini menggunakan metode kuantitatif melalui kuesioner yang diberikan kepada responden yang dipilih secara sensus serta didukung dengan data kualitatif yang diperoleh melalui wawancara mendalam. Pengolahan data pada penelitian ini menggunakan korelasi Rank Spearman. Hasil penelitian memperlihatkan bahwa dinamika kelompok pada dua kelompok tani tergolong dinamis dan tingkat keberhasilan diseminasi teknologi tergolong berhasil. Tidak terdapat korelasi antara karakteristik individu dan dinamika kelompok, namun terdapat korelasi yang nyata antara dinamika kelompok dan tingkat keberhasilan diseminasi teknologi., The main problem faced by urban farmers is limited land, as experienced by farmers in the city of Medan. Therefore, the Department of Agriculture and Fisheries of Medan City carried out technology dissemination activities regarding urban farming programs. The success of technology dissemination activities does not only depend on the sources and materials of information but also on the recipients of the information. This study aims to analyze the relationship between group dynamics and the success rate of technology dissemination. This study uses quantitative methods through questionnaires given to respondents selected by census and is supported by qualitative data obtained through in-depth interviews. Data processing in this study uses Spearman Rank correlation. The results showed that the group dynamics of the two farmer groups are dynamic, with the success rate of technology dissemination being high. There is no correlation between individual characteristics and group dynamics, but there is a significant correlation between group dynamics and the success rate of technology dissemination.
Keyword: farmers group, group dynamics, technology dissemination, urban farming

Judul: Dinamika Kelompok dan Diseminasi Informasi Urban Farming pada Kelompok Tani (Kasus di Kecamatan Pesanggrahan, Jakarta Selatan, DKI Jakarta)
Abstrak: Keterbatasan lahan merupakan salah satu permasalahan yang dihadapi oleh petani di Kecamatan Pesanggrahan, Jakarta Selatan. Oleh karena itu, terdapat upaya yang dilakukan pemerintah berupa diseminasi informasi mengenai program urban farming. Dalam menentukan keberhasilan kegiatan diseminasi informasi bergantung pada penerima informasi yaitu anggota kelompok tani. Tujuan penelitian ini yaitu untuk menganalisis hubungan dinamika kelompok dengan tingkat diseminasi informasi urban farming. Variabel dalam penelitian ini yaitu karakteristik anggota kelompok (X1), faktor-faktor dinamika kelompok (X2), dinamika kelompok (Y1), dan tingkat diseminasi informasi (Y2). Penelitian ini menggunakan tabulasi silang untuk menganalisis hubungan antar variabel. Hasil penelitian ini menunjukkan bahwa tidak terdapat korelasi antara karakteristik anggota kelompok dengan dinamika kelompok. Namun, terdapat korelasi antara faktor dinamika kelompok dengan dinamika kelompok dan dinamika kelompok dengan tingkat keberhasilan diseminasi informasi., Land limitation is one of the problems faced by urban farmers in Pesanggrahan District, South Jakarta. Therefore, there are efforts made by the government in the form of information dissemination regarding the urban farming program. In determining the success of information dissemination activities, it depends on the recipient of the information which is the member farmer groups. The purpose of this study is to analyze the relationship between group dynamics and the level of dissemination of urban farming information. The variables in this study were members characteristics (X1), group dynamics factors (X2), group dynamics (Y1), and level of information dissemination (Y2). This study used crosstab to analyze the relationship between variables. The results showed that there is no correlation between member groups characteristics and group dynamics. However, there is a correlation between group dynamics factors and group dynamics and the success rate of information dissemination.
Keyword: dissemination information, farmers group, group dynamics

Judul: Enhancement of photon absorbtion on BaxSr1-xTiO3 thin films semiconductor using photonic crystals.
Abstrak: In this research, has been conducted BaxSr1-xTiO3 (BST) thin films manufacturing for mole fraction x = 0.25, 0.35, 0.45, and 0.55; and concentration of 1 molar using chemical solution depositon (CSD) method. The materials, which are used in this research, are barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%], titanium isopropoxide [Ti(C12O4H28), 97.999%], gallium trioxide [Ga2O3], 2-methoxyethanol [H3COOCH2CH2OH, 99%] and 1 x 1 cm of transparent conductive oxide (TCO) glass as substrate. Two BST thin films are made that for BST thin films which are doped by 10% galium (BGST) as p-type layer and pure BST solution as n-type. BST solution is made by reacting barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%] and titanium isopropoxide [Ti(C12O4H28)] into 2-methoxyethanol solvent [H3COOCH2CH2OH, 99%] in accordance with mass gram for each x value. While, BGST solution is made in the same way as BST solution, plus adding gallium at 10% of the mass of BST. Once all materials are reacted, then vibrated using ultrasonic for 90 minutes, and followed by coating BGST / BST on the TCO substrate. Once the layer is formed, then annealed for 15 hours at temperature of 500 °C with increasing rate of 1.67 oC/minute. Characterizations of BST thin films with or without photonic crystals include the absorbance and transmittance in the visible light spectrum, as well as the electrical photoconductivity characterizations. From BST thin films without photonic crystals indicate that our thin films have light absorption area on almost the entire range of the visible light spectrum even to the infrared range with absorption value over than 67.6%, in addition, it can be seen that the maximum absorbance of BST thin films for all mole fractions lie in blue to green light spectrum region, 457 nm ≤ λ ≤ 570 nm and the minimum in yellow to red light spectrum region, 570 nm ≤ λ ≤ 678 nm. The largest absorbance is found at x = 0.25 with average absorbance value of 92.04% and maximum and minimum absorbance peaks at wavelength of 500.89 and 657.72 nm, respectively. At x = 0.35, average absorbance value decreased to 83.55% with maximum and minimum peaks at 505.73 and 613.68 nm, respectively. Then increased to 91.16% at x = 0.45 with maximum and minimum peaks at 506.04 and 618.56 nm, respectively. At x = 0.55, average absorbance value decreased to 80.12% with maximum and minimum peaks at 507.85 and 608.79 nm, respectively. Moreover, it can be seen that the addition of barium mole fraction leads to wider maximum absorbance or minimum transmittance peaks and narrower minimum absorbance or maximum transmittance peaks in the same range of the green and blue & red light spectrums, respectively. BST thin films with photonic crystals show increasing in absorption for all x values in the range of 3.04 into 13.33%. At x = 0.25, average absorbance percentage increased 3.96% from 92.4 into 95.68%, for x = 0.35 average percentage increased 7.07% into 89.45 from 83.55%. Furthermore, average absorbance of BST thin films at x = 0.45 increased 3.04% from 91.16 into 93.93% and x = 0.55 has
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