Eksakta Jurnal IlmuIlmu MIPA最新文献

{"title":"Comparison Of Artificial Neural Network Backpropagation and Garch Methods In Predicting Stock Price (Case Study: Indosat Shares 2012 – 2022)","authors":"Maktisen Ena","doi":"10.20885/eksakta.vol4.iss2.art3","DOIUrl":"https://doi.org/10.20885/eksakta.vol4.iss2.art3","url":null,"abstract":"Abstract: One of the problems encountered in the forecasting process is the problem of heteroscedasticity. Heteroscedasticity occurs a lot, especially in stock data. Pt Share Price Indosat (tbk) from March 6 2012 – January 18 2022 has fluctuated from time to time, so the variance is heteroscedasticity. The Generalized Autoregressive Conditional Heteroskedasticity (GARCH) model and Artificial Neural Network Backpropagation (ANNBP) are methods that can be used on data with heteroscedasticity. The aim of this research is to obtain models and forecasting results from GARCH and ANN Backpropagation. In this study, the two models were compared based on the smallest MAPE value. This study uses daily data on the closing of Indosat shares. Forecasting is done on Indosat stock closing data, the total data is 2453 data divided into two parts, namely 80% training data totaling 1962 data and 20% training data totaling 491 data. Forecasting results from the GARCH model obtained a MAPE value of 11.04%, and the ANN Backpropagation model with 7 input layers, 20 hidden layers, obtained a MAPE value of 7.01%. Thus, the best model for predicting Indosat's share price in this study is the backpropagation model.","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135464761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisis Profitabilitas Agroindustri Minyak Nilam di Desa Bambadaru Kecamatan Tobadak Kabupaten Mamuju Tengah","authors":"Sitti Ruqayya Marham, Dewi Sartika, Isnam Junais","doi":"10.33319/agtek.v25i1.125","DOIUrl":"https://doi.org/10.33319/agtek.v25i1.125","url":null,"abstract":"The purpose of this research was to determine the profitability of patchouli oil agroindustry in Bambadaru Village, Tobadaka District, Central Mamuju Regency, and to determine the sensitivity to changes in patchouli oil prices sold there. The sample taken above in this research was carried out intentionally and deliberately, namely the owner of a patchouli oil refining business in Bambadaruu Village, Tobadak District, Central Mamuju Regency. BEP (Break Even Point), sensitivity, and profitability analysis of the data used in this research is intended to analyze production costs and profitability. The results of this resesrch indicate that the patchouli oil agro-industry business in Bambadaru Village, Tobadak District, Central Mamuju Regency will break even or return to normal operations in units of BEP and BEP rupiah. So the number of BEP units used from the results of the analysis is 17 kg with a total of around Rp. 6,665,845. And for the sensitivity of the decrease in the selling price of patchouli oil by 20%, it can affect the profitability of the patchouli oil agro-industry business in Bambadaru Village, Tobadak District, Central Mamuju Regency, where the profits obtained by business owners have decreased. Which initially has a profit of Rp. 52,861,784 to Rp. 36.002.216","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89354161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pengaruh Komposisi Media Tanam dan Plant Growth Promoting Rhizobacteria Terhadap Pertumbuhan Bibit Kakao","authors":"Pauliz Budi Hastuti, Ni Made Titiaryanti, Dina Mardhatilah","doi":"10.33319/agtek.v25i1.135","DOIUrl":"https://doi.org/10.33319/agtek.v25i1.135","url":null,"abstract":"To obtain quality cocoa seedlings, maintenance efforts are required during the nursery stage, including meeting the nutritional needs of the planting medium which can be in the form of organic fertilizer from goat manure and husk charcoal. In addition, efforts to improve growing media in nurseries can be used with biological fertilizers, including plant growth promoting rhizobacteria (PGPR). Goat manure for plant nutrients, as well as a source of nutrients for PGPR. The research objective was to determine the effect of media composition and PGPR on the growth of cocoa seedlings. Research with the experimental method of factorial design consisting of two factors was arranged using a completely randomized design. The first factor was soil planting medium: goat manure: husk charcoal (v/v) consisting of 3 levels: M0 = 1:0:0 (control), M1 = 1:1:0 and M2 = 1:1:1. Factor II, namely the dose of PGPR consists of 3 levels: K1 = 10 ml/seedling, K2 = 20 ml/seedling, and K3 = 30 ml/seedling. With three repetitions. Observational data were analyzed with variance at the 5% level. To find out the differences between treatments, the Duncan's Multiple Range Test was continued at 5% level. The results showed that there was no significant interaction between media composition and PGPR dosage on the growth of cocoa seedlings. The composition of the soil medium : goat manure : husk charcoal 1:0:0 and 1:1:0 gave good growth of cocoa seedlings. PGPR doses provide the same growth of cocoa seedlings.","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87260494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pengaruh Penambahan Tepung Mokag Tehadap Tingkat Kesukaan Konsumen Pada Kerupuk Biji Durian","authors":"Dwi Ari Cahyani","doi":"10.33319/agtek.v24i1.128","DOIUrl":"https://doi.org/10.33319/agtek.v24i1.128","url":null,"abstract":"Crackers are a type of snack that is favored by consumers of all ages. Crackers can be consumed directly as a snack or as a side dish. One of the factors that determine the quality of crackers is the crispness. Durian is one of the many local fruits produced in Banjarnegara Regency. Durian consists of skin, flesh and seeds. When the durian season arrives, the seeds and skin of the durian become waste that is not utilized. The nutritional content of durian seeds which is quite a lot can be used as processed food that can be consumed by the community. Mocaf flour (Modified cassava flour) is a flour product derived from cassava which is processed using the principle of modifying cassava cells by fermentation. Based on the background of previous research results, it can be formulated the problem that underlies this research, namely how the right composition of durian seeds and mokaf flour and the length of time for boiling durian seeds to produce durian seed crackers are favored by consumers. This study aims to determine the level of consumer preference from the taste, color, texture and aroma of the durian seed crackers produced. This study used fresh durian seeds collected at durian sellers in the Sigaluh area, Banjarnegara Regency. The research was carried out at the Agricultural Product Processing Laboratory and Production Unit of the Banjarnegara Polytechnic Agroindustry Study Program. This study applies experimental research methods. The experimental design used was a completely randomized design with 3 replications. The hedonic test used 25 semi-trained panelists and the test results were analyzed using Anova. Furthermore, a follow-up test was used to determine whether there was a significant difference between the various treatments using the DMRT (Duncan Multiple Range Test) test. The results showed that the panelists preferred mokaf durian seed crackers which were processed with 100% durian seeds boiled by boiling for 30 minutes without the addition of mokaf flour. The panelists' preference for the color of the durian seed crackers was significantly different when the durian seeds were boiled for 30 minutes. While the aroma of the durian seed crackers produced is significantly different from the crackers by boiling for 30 minutes","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82390702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pertumbuhan Stek Pucuk Mangga (Mangifera indica L.) terhadap Respon Konsentrasi IBA (Indole Butyric Acid) dan Macam Media Tanam","authors":"Zainol Arifin Zainol Arifin, Ida Sugeng Suyani, Aprilia Hartanti","doi":"10.33319/agtek.v25i1.130","DOIUrl":"https://doi.org/10.33319/agtek.v25i1.130","url":null,"abstract":"Mango (Mangifera indica L.) is a fruit plant that has long been known and has become a commodity that has high economic value and is a trade commodity between countries. Vegetative propagation technique is an alternative to reproduce this type of plant. This study aims to: 1) Determine the concentration of IBA (Indole Butyric Acid) which affects the growth of mango shoot cuttings (Mangifera indica L.). 2) Knowing the planting media that affect the growth of mango shoot cuttings (Mangifera indica L.). 3) To determine the interaction between the concentration of IBA (Indole Butyric Acid) and the planting medium which influences the growth of mango shoot cuttings (Mangifera indica L.). The research was carried out using Factorial Randomized Block Design (RBD) with 2 factors. The first factor was the concentration of IBA (Indole Butyric Acid) (0 ppm, 500 ppm and 1000 ppm) and the second factor was the planting medium (sand, husk charcoal and sand + husk charcoal) with 3 replications. The results of this study were 1) There was an effect of IBA (Indole Butyric Acid) concentration treatment on the growth of mango shoot cuttings (Mangifera indica L.). The effect occurred on the percentage of growing cuttings, days of shoot break, shoot length, and number of leaves. 2) There is an effect of growing media treatment on the growth of mango shoot cuttings (Mangifera indica L.). The effect occurred on the percentage of growing cuttings, shoot length and number of leaves. 3) There was no interaction between the treatment of IBA (Indole Butyric Acid) concentrations and the growing media on the growth of mango shoot cuttings (Mangifera indica L.).","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"28 46","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72496194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pengaruh Model Penanaman Turnera Subulata terhadap Populasi H. armigera dan B. tabaci Serta Musuh Alaminya pada Tanaman Tomat (L. esculentum Mill.)","authors":"Ajeng Faradhila Muninggar, Nanang Tri Haryadi","doi":"10.33319/agtek.v25i1.133","DOIUrl":"https://doi.org/10.33319/agtek.v25i1.133","url":null,"abstract":"The tomato plant (L. esculentum mill) is a species of horticultural plant native to Latin America. It is one of the important horticultural plants and is included in the second largest vegetable after potatoes. Some of the main pests of tomato plants are B. tabaci and H. armigera which can lower production. Pest control using chemical pesticides can be reduced using growing refugia plants. This study was conducted to determine the effect of some models of reflux cultivation on natural enemy populations on tomato plants. This study used a Group Random Design consisting of 4 treatments: P0 (Control), P1 (Border Model), P2 (Strip Model), P3 (Random Model) each treatment was repeated 6 times. Research results show that the Border's reflux planting model has a good influence on the natural enemy population with the highest population obtained in the treatment of P1 (Border), with an average natural enemy population of 27 at most. This has a good effect on the decline of the pest population with the lowest average population obtained in the treatment of P1 (Border) and the highest pest population in the treatment of P0 (Control) at 2.85. \u0000 ","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85860950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spesies Serangga Hama Padi dan Jagung serta Intensitas Serangannya di Kabupaten Lahat","authors":"Novian Novian, Fitri Ramadhani","doi":"10.33319/agtek.v25i1.137","DOIUrl":"https://doi.org/10.33319/agtek.v25i1.137","url":null,"abstract":"Insect pest attack on rice (Oryza sativa L.) and maize (Zea mays L.) could be potential in decrease production. This study aims to determine the insect pest species of rice and maize and attack intensity in Lahat District. This study was conducted using survey methods. The systematic random sampling methodology was adopted for sample population identification. Surveys were conducted in 3 subdistricts (Jarai, Pajar Bulan and Sukamerindu). Found three rice insect pests species. The third species was rice stem borer (Scirpophaga incertulas), leaf folder (Cnaphalocrosis medinalis) and rice bug (Leptocorisa sp). Found one maize insect pest species was fall armyworm (Spodoptera frugiperda). S. incertulas has attacked in 7 locations with low-intensity, Leptocorisa sp has attacked in 2 locations with low-intensity, C. medinalis has attacked in 1 location with low-intensity and S. frugiperda has attacked in 4 locations with low-intensity. Rice stem borer and fall armyworm can attack crop from the vegetative to generative phase.","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83281354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pertumbuhan dan Hasil Beberapa Varietas Padi Gogo Toleran Alumunium di Lahan Kering Masam Lampung Timur","authors":"Priyadi, Rianida Taisa, Dulbari, Rizky Rahmadi, Fajar Rochman","doi":"10.33319/agtek.v25i1.134","DOIUrl":"https://doi.org/10.33319/agtek.v25i1.134","url":null,"abstract":"Aluminum stress is a limiting factor for crop production on acid dry land with a low pH. The objectives of this study were to evaluate aluminum-tolerant upland rice varieties in acid dry land. The study was carried out using a completely randomized block design (RCBD) consisting of 8 varieties, namely IR64, Inpago 7, Dodokan, Dod-Pup1, Situ Bagendit, Situ Bg-Pup1, Batur, Batur-Pup1, and 4 strains, namely 19 (PB5)-2, 20 (PB8)-1, 21 (PB15)-1, and 22 (PB16)-1. The results showed that the Situ Bagendit variety with the Pup-1 locus gave the highest yield per plot compared to other varieties and lines, namely 287.5 g. These results also correlate with the ability of the variety to withstand aluminum stress, with a tolerance value of 3.00 (rather tolerant).","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84710629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisis Nilai Tambah Agroindustri Gula Aren (Studi Kasus Pada CV. Putri Tunggal) di Desa Salupangkang Kecamatan Topoyo Kabupaten Mamuju Tengah","authors":"Santi Susilawati","doi":"10.33319/agtek.v23i2.121","DOIUrl":"https://doi.org/10.33319/agtek.v23i2.121","url":null,"abstract":"This study aims to: 1). This study aims to determine the process of processing palm sap into palm sugar in Salupangkang Village, Topoyo District, Central Mamuju Regency. 2). To find out the added value of palm sugar agroindustry in Salupangkang Village, Topoyo District, Central Mamuju Regency. This palm sugar agroindustry is one of the businesses that has developed in Salupangkang Village, Topoyo District, Central Mamuju Regency. This industry is expected to improve product quality, profitability, and added value. The object of this research is focused on the CV. Putri Tunggal. The informant determination technique was used to answer and provide information to researchers. The data collected includes primary data and secondary data. Data analysis was carried out using the value-added analysis format according to the method of Hayami et al. The results showed that the added value obtained in the palm sugar agroindustry was Rp. 792/Kg of raw materials with a ratio of Rp. 26.4%, Profit from palm sugar agroindustry is Rp. 786.25, with a profit rate of 26.20%. The added value produced means that the palm sugar agroindustry has succeeded in transforming palm juice into palm sugar products so that it has more value than palm juice itself.","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82614805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uji Toksisitas Jamur Metarhizium anisopliae terhadap Hama Ulat Krop Kubis Crocidolomia binotalis Zell.","authors":"Siska Agustina Pertiwi, Nanang Tri Haryadi","doi":"10.33319/agtek.v23i2.116","DOIUrl":"https://doi.org/10.33319/agtek.v23i2.116","url":null,"abstract":"Cabbage head caterpillar Crocidolomia binotalis Zell. caused up to 79.81% damage to cabbage plants. Metarhizium anisopliae is an entomopathogenic fungus that is often used for pest control in the field because it is toxic to various phases of insect life. This study aimed to determine the toxicity ability of the fungus Metarhizium anisopliae in controlling the population of the cabbage head caterpillar Crocidolomia binotalis Zell. in the laboratory. The research was conducted at the Laboratory of Agrotechnology, Faculty of Agriculture, University of Jember. The study used a Completely Randomized Design with 5 treatments and 4 replications in order to obtain 20 experimental units. The treatments used in this study were as follows: A = Control (aquadest); B = density 104 conidia/ml; C = density 105 conidia/ml; D = 106 conidia/ml; and E = 107 conidia/ml. The results showed that in the laboratory test the density of the fungus Metarhizium anisopliae 107 conidia/ml caused the highest mortality of 92.50%, while the lowest mortality percentage was 22.50% in the treatment of 104 conidia/ml on 7 days of observation. The results of the LT50 calculation showed that the most effective density was 106 conidia/ml with an LT50 value on the 4th day. The most effective density of Metarhizium anisopliae, 106 conidia/ml, was recommended for use in population control of the cabbage head caterpillar Crocidolomia binotalis Zell. because it is capable of causing the death of 50% of the population of Crocidolomia binotalis Zell. with the fastest time of about 4 days.","PeriodicalId":32099,"journal":{"name":"Eksakta Jurnal IlmuIlmu MIPA","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87751445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}