The Analysis of Chlorogenic Acid and Caffeine Content and Its Correlation with Coffee Bean Color under Different Roasting Degree and Sources of Coffee (Coffea arabica Typica)

Coffee is one of the main economic crops in the world and is now widely grown throughout Taiwan. The process of roasting coffee begins with the heating and smooth expansion of raw beans, which leads to changes in appearance and color while affecting the flavor and taste of coffee. So far, most coffee manufacturers have used visual inspection or colorimeter methods to identify differences in coffee quality. Moreover, there is no literature discussing the correlation of roasted bean color with caffeine and chlorogenic acid content. Therefore, the purpose of this experiment was to analyze the chlorogenic acid and caffeine content and their correlation with bean color under different roasting degrees and from different sources to establish basic data for the rapid identification of coffee quality in the future. In this experiment, the coffee Coffea arabica typica from Dongshan, Gukeng, and Sumatra’s Indonesian rainforest was used, and the beans were roasted into four degrees: raw bean, light, medium, and dark roast, to investigate the appearance of the coffee beans and its correlation with caffeine and chlorogenic acid content. The results showed that with a higher roasting degree, caffeine content increased gradually, except for Indonesian beans, but the chlorogenic acid content in all samples showed a declining trend with the increase in roasting degree. The correlation between the chlorogenic acid content and the color space value of the coffee bean color shows that L*, a*, and h° in both ground and unground coffee are highly correlated. The C* value of the ground and unground coffee showed a correlation coefficient of r = 0.159 ns and 0.299 ns, respectively. The correlation between the caffeine content and the color space value of the unground coffee bean shows that the a*, b*, and C* value is highly correlated with the caffeine content. The color space values of ground coffee beans show no correlation with caffeine.

Teknologi Tanaman Padi Sistem Tanam Benih Langsung dengan Hambur di Dataran Tinggi Sumatera Utara (Studi Kasus di Kabupaten Humbang Hasundutan)

Rice farmers in Humbang Hasundutan Regency still maintain rice technology with the scattering system because farmers feel this planting system to be still relevant to the condition of available resources in Humbang Hasundutan Regency. The study of direct seed planting system technology in Humbang Hasundutan Regency was carried out using a survey method by conducting interviews with key informants in Polung Subdistrict, Humbang Hasundutan Regency. From the interview results, it was found that the transplanting system technology, both with tiles and jajar legowo in Humbang Hasundutan Regency, did not give significantly different results compared to the scattering system. The results of the farming analysis obtained show that the scattering system gives an R/C value of 1.88 compared to the transplanting system of 1.94 R/C.

Distribution and soil carbon stocks of agroforestry vegetation on dry land in Aceh Besar regency

Research to find out how big the potential of soil carbon in agroforestry vegetation in Aceh Besar regency. This research was conducted on agroforestry vegetation on dry land in the Aceh Besar regency. Content carbon on the type of agroforestry land-use, two samples were taken each composite soil on depth 0-5 cm, 5-10 cm, 10-20 cm, 20-30 cm, 30-70 cm and 70-100. For the analysis of carbon content, activities are carried out in the soil laboratory and plants of the Faculty of Agriculture, Syiah Kuala University. The carbon content in agroforestry vegetation is quite high, and this can be described in the percentage of carbon which has a classification from high to very low. Soil depth 0-5 cm has a carbon percentage with a high classification value of 3.40 and at a depth of 30-70 cm has the lowest % C value of 0.35% with a very low classification. tends to increase soil C and N through increased root complementarity, lower underground competition.

Automatic Term Recognition Method for Military Domain

With the development of military intelligence, higher requirements are put forward for automatic term recognition in military field. In view of the characteristics of flexible and diverse naming of military requirement documents without annotated corpus, the method of this paper uses the existing military domain core database, and matches the data set and core database by Aho-Corasic algorithm and word segmentation technology, so that the terms to be recognized in the data set can be divided into three types. The possible rules of word formation of military terms are summarized and phrases that conform to the rules of word formation are found in the documents as the term candidate set. The core library and TF-IDF method are used to calculate the value of the candidate terms, and the candidate terms whose value is greater than the threshold are selected iteratively as the real terms. The experimental results show that the F1 value of this method reaches 0.719, which is better than the traditional C-value method. Therefore, the method proposed in this paper can achieve better automatic term recognition effect for military requirement documents without annotation.

Copra processing issue of migrant farmers in tidal land of South Sumatra

The study was carried out in the tidal land region of Pendowo Harjo Village, Sungsang District, Banyuasin District, South Sumatra Province, with the goal of calculating the production costs and income gained, as well as determining the financial feasibility of the copra processing business. Simple random selection was used to choose sample farmers, with 45 sample farmers managing the copra processing business chosen from a total of 235 population members. All sample farmers were Bugis ethnic migrant farmers. The analysis results showed that with an average area of 1.15 hectares, an income of IDR 2,530,886.98 was obtained. The production costs incurred were IDR 1,756,328.15 resulting in an income of IDR 774,558.83 per arable area per production process (for a period of 3 months). The NPV value was IDR 102,638,789.00, with the IRR value was 49.92 per cent, and the Net B/C value was 2.28. These figures show that a copra processing business can be developed in the area financially.

Sorghum cultivation of the ratoon system for increased yields in dry land

Planting sorghum twice a year on dry land is constrained by the short duration of rainfall, so it requires technology to increase yields with the ratoon cropping system. The research was carried out in Agricultural Technology Research and Assessment Installation of Bajeng, Gowa, South Sulawesi from March to October 2019. The superior genotypes of sorghum were planted on marginal land as the main crop with a spacing of 75 cm x 20 cm (66,666 plants/ha). The ratoon plant used a split-split plot design. The main plot consisted of two mulches: M1=no mulch + 50% dose of main crop fertilization and M2=sorghum stover mulch + biodecomposer 1kg/ha without NPK fertilizer. The sub-plots consisted of 2 populations: P1=population of 66,666 plants/ha (1 shoot/hole), P2=133,332 ratoon plants/ha (2 shoots per hole). The sub-sub-plots consisted of 5 (five) genotypes/varieties of sorghum: V1=Numbu, V2=No.58-1, V3=No. 86.1, V4=No.103-1 and V5=No. 113-1, so that 20 treatment combinations were obtained with 3 replications. The results showed that to obtain high grain yield in ratoon cultivation in dry land, NPK fertilization (150-100-50)/ha is still necessary. The increase in population density of ratoon from 66,666 to 133,333 plants/ha significantly affected the increase in grain yield. Sorghum genotype No. 58-1, No. 86-1, No. 103-1 and No. 113-1 is technically and economically feasible to be developed in the cultivation of the double harvest ratoon system with the profit (Rp 10,989,000-12,247,500/ha) from the cultivation of sorghum once the main crop (Rp 4,003,000-4,856,000). The R/C value is 2.00-2.10 and the MBCR value is 2.27-2.38.

Farmer response and financial feasibility of corn seed production in Southeast Sulawesi

To support the growth and development of corn in Southeast Sulawesi, information of farmer response and financial feasibility of corn seed production in South East Sulawesi are needed. The paper aims to determine farmers’ response and financial feasibility of corn seed production in Southeast Sulawesi, The results of this study are expected to be input for local governments in developing community-based seed breeders and can be useful for corn seedling businesses. The study was conducted in marc 2017 in Pangan Jaya Village, Lainea District, Konawe Selatan Regency, Southeast Sulawesi Province. The study was carried out by involving 20 farmers, 10 people for the production of corn seed production technology and 10 non-cooperator farmers who carried out according to the patterns and habits of farmers (feed corn production).. The data collected consists of (1) corn seed production data based on the results of corn seed reall production (2) farmer and non-breeder farm input data, consisting of expenditures for the purchase of production facilities and labor costs. The results of research were (1) Farmers’ response obtained, 83% of farmers gave a good perception of the breeding business of corn seeds. it means that corn breeding business is very likely to be cultivated and developed further. (2) Corn seed production business in Southeast Sulawesi is financially profitable and feasible to be developed with a B/C value of 2.15 and MBCR 4.4. These results indicate that the corn seed production business has good development prospects In order to support the continuous supply and fulfill of the need for quality corn seeds in Southeast Sulawesi, it is necessary to develop breeding of corn seeds, especially in areas of corn development centers. Market support is very much needed for the marketing of seed production. Market certainty will provide opportunities for the growth of new breeders, and will ensure the sustainability of corn seed breeding business at the farm level.

EXPLORING MOTIVATION TO LEARN MATHEMATICS THROUGH VROOM’S THEORY

<p>Mathematics is one of the fundamental subjects that contributes to Science, Technology, Engineering and Mathematics (STEM) careers since it plays a vital role in this Fourth Industrial Revolution. Due to that, this subject has been added in syllabus starting from primary school until university level and most of the students are taking mathematics but not limited to the students who are in the STEM area only. However, not all students particularly favour this subject since it requires problem solving skills as well as motivation to learn the subject matter. Therefore, the objective of this study was to investigate students’ motivation in learning Mathematics through Vrooms’ Theory. Quantitative method was used by distributing a set of questionnaires to 234 students in a public university in Malaysia. The instrument from the questionnaire consisted of three sections, a) affective components, b) expectancy components and c) value components with a total of 24 items. The findings revealed that students face anxiety while learning Mathematics and it could be motivating factors for the student to work even harder to perform in Mathematics. It was shown that their motivation towards learning Mathematics was influenced by how much value they placed on the outcome of the learning. This study can help educators to have a better understanding of students' learning motivation and provide continuous support to students. </p><p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0853/a.php" alt="Hit counter" /></p>