bluuebunny/crossref_metadata_2025 huggingface dataset:
Spatio-temporal properties of pulse propagation in a graphene quantum system
Authors: Xiao Chao
Published: January 2022

In this paper we have theoretically studied the spatial-temporal evolution of electromagnetic light propagation through a four-level graphene quantum system by using density matrix method and perturbation theory. The four-level graphene quantum medium interacted by an elliptical polarized coupling and a weak probe lights, respectively. We present the analytical solution for solving the Maxwell–Bloch equations for graphene and electromagnetic field in space and time domains. Then, we have analyzed the dynamic control of pulse propagation and optical dual switching in such a laser-driven quantum system. Our theoretical findings show that by adjusting the optical parameters such as elliptical angle i.e. phase difference between right-and-left circularly polarized, one can easily control the absorption spectrum and pulse propagation of the probe light in graphene medium. Our results may have potential applications in designing the new quantum devices for usage in quantum information processing.
Simulation of convective transport during frequency chirping of a TAE using the MEGA code
Authors: Hezaveh H. , Todo Y. , Qu Z.S. , Breizman B.N. , Hole M.J.
Published: January 2022

We present a procedure to examine energetic particle phase-space during long range frequency chirping phenomena in tokamak plasmas. To apply the proposed method, we have performed self-consistent simulations using the MEGA code and analyzed the simulation data. We demonstrate a traveling wave in phase-space and that there exist specific slices of phase-space on which the resonant particles lie throughout the wave evolution. For non-linear evolution of an n = 6 toroidicity-induced Alfvén eigenmode (TAE), our results reveal the formation of coherent phase-space structures (holes/clumps) after coarse-graining of the distribution function. These structures cause a convective transport in phase-space which implies a radial drift of the resonant particles. We also demonstrate that the rate of frequency chirping increases with the TAE damping rate. Our observations of the TAE behavior and the corresponding phase-space dynamics are consistent with the Berk–Breizman theory.
Xenon doping of liquid argon in ProtoDUNE single phase
Authors: Gallice N.
Published: January 2022

The Deep Underground Neutrino Experiment (DUNE) will be the next generation long-baseline neutrino experiment. The far detector is designed as a complex of four LAr-TPC (Liquid Argon Time Projection Chamber) modules with 17 kt of liquid argon each. The development and validation of the first far detector technology is pursued through ProtoDUNE Single Phase (ProtoDUNE-SP), a 770 t LAr-TPC at CERN Neutrino Platform. Crucial in DUNE is the photon detection system that will ensure the trigger of non-beam events — proton decay, supernova neutrino burst and BSM searches — and will improve the timing and calorimetry for neutrino beam events. Doping liquid argon with xenon is a known technique to shift the light emitted by argon (128 nm) to a longer wavelength (178 nm) to ease its detection. The largest xenon doping test ever performed in a LAr-TPC was carried out in ProtoDUNE-SP. From February to May 2020, a gradually increasing amount of xenon was injected to also compensate for the light loss due to air contamination. The response of such a large TPC has been studied using the ProtoDUNE-SP Photon Detection System (PDS) and a dedicated setup installed before the run. With the first it was possible to study the light collection efficiency with respect to the track position, while with the second it was possible to distinguish the xenon light (178 nm) from the LAr light (128 nm). The light shifting mechanism proved to be highly efficient even at small xenon concentrations (<20 ppm in mass) furthermore it allowed recovering the light quenched by pollutants. The light collection improved far from the detection plane, enhancing the photon detector response uniformity along the drift direction and confirming a longer Rayleigh scattering length for 178 nm photons, with respect to 128 nm ones. The charge collection by the TPC was monitored proving that xenon up to 20 ppm does not impact its performance.
Concept of circular-linear energy recovery accelerator to probe the energy frontier
Authors: Konoplev I.V. , Bogacz S.A. , Shashkov Y. , Gusarova M.A.
Published: January 2022

Energy-frontier accelerators provide powerful tools performing high precision measurements confirming the fundamentals of the physics and broadening new research horizons. Such machines are either driven by circular or linear accelerators. The circular machines, having the centre-of-mass (CM) energy values reaching 200 GeV (for leptons) and above, experience beam energy loss and quality dilution, for example, due to synchrotron radiation, limiting the overall CM energy achievable and requiring a constant energy top-up to compensate the loss and the beam quality dilution. Linear colliders overcome these limitations, while the finite capabilities of generating high average current beams limits the luminosity. This is partially compensated by the quality of the colliding beams. In this work, we suggest a novel design of circular-linear accelerator based on the merging of the “non-emitting”, low-energy storage rings and energy recovery linear accelerators. We suggest using the recently considered dual-axis asymmetric cavities to enable the operation of such a system, and in particular the energy recovery from spent, high-intensity beams. The machine considered, under the scope of the SNOWMASS-2021 initiative, can be potentially used to reach ultimate energy frontiers in high-energy physics as well as to drive next generation light sources. The merging of circular and linear systems, and applications of dual axes cavities, should allow the maintaining of high beam quality, high luminosity, and high energy efficiency, while offering a flexible energy management and opening clear opportunity for reducing the running cost. We note that the numbers shown in the paper are for illustration purpose and can be improved further.
Bamboo as future bio-industrial material: Physical behaviour and bending strength of Malaysia’s Beting bamboo (Gigantochloa levis)
Authors: Osman S , Ahmad M , Zakaria M N , Zakaria A M , Ibrahim Z , Abu F , Bahari S A , Wan Jaafar W N R
Published: January 2022

In this paper, bending strength and physical properties (specific gravity, dimensional stability and equilibrium moisture content) of a Malaysian bamboo locally known as Beting bamboo (Gigantochloa levis) are addressed. Characterizations of physical and bending strength of G. levis in terms of the variability of location along culm height (top, middle, bottom), culm section (nodes and internodes), fiber orientation (longitudinal, tangential and radial) and culm layer (outer and inner) were conducted. Comparison of these properties is also made to some bamboo and commercial timber species. It was found that G. levis has favorable physical and mechanical properties although the specific gravity of G. levis has tendency to be on the higher side. The characteristics studied were found to have some variability at different locations, sections, and directions. There was variability in terms of bending strength along with the culm height of bamboo. It is indicated from this study that the bending strength and physical properties of G. levis were found to be satisfactory.
Effect of urea coating by chitosan on the dynamics of ammonia concentration and rumen fermentation in vitro
Authors: Nayohan S , Wiryawan K G , Jayanegara A
Published: January 2022

The aim of this study was to determine the effect of coating urea by chitosan at graded levels on ammonia concentration and rumen fermentation in vitro. This study used Factorial Randomized Complete Block Design (RCBD) to test ammonia parameter and Randomized Complete Block Design (RCBD) for pH, microbial protein synthesis, dry matter and organic matter digestibility, and Volatile Fatty Acid (VFA). The treatments tested were: P0 = addition non coating urea 1%; P1 = coating urea by chitosan 1%; P2 = coating urea by chitosan 2%; P3 = coating urea by chitosan 3%. The data obtained were analysed by using ANOVA and continued with Tukey HSD test with SPSS version 25. The results of this study showed that the coating of urea chitosan had no significant effect on pH, dry matter and organic matter digestibility, microbial protein synthesis, and amonia concentration in the rumen. However, it significantly reduced (P <0.05) total VFA concentration. It can be concluded that the application of urea coating by chitosan does not affect on the degradation of urea in the rumen.
Performance of cocoa beans production modelling in Indonesia
Authors: Zakiah  , Safrida  , Frastica N
Published: January 2022

Cocoa beans production Indonesia has decline in recent years but demand for cocoa beans relatively increase. This research aims to analyse the modelling of cocoa beans production in Indonesia. This research used secondary data from 2005-2018, with simultaneous equation models. The results of this research indicate that the production of cocoa beans has a positive relationship with land area, international price of cocoa beans and lag of cocoa beans production, while the price of domestic cocoa beans has a negative relationship with cocoa beans production. Domestic demand for cocoa beans has a positive relationship with domestic price of cocoa beans and the cocoa processing industry. Domestic price of cocoa beans has a positive relationship with domestic demand for cocoa beans, international price of cocoa beans and lag domestic price of cocoa beans, while cocoa beans production has a negative relationship with domestic cocoa bean prices.
The nutrient content of N, P, K in Andisols and Arabica coffee leaves in Bener Meriah Regency, Indonesia
Authors: Hifnalisa  , Karim A , Fazlina Y D , Manfarizah  , Jufri Y , Sabrina T
Published: January 2022

Bener Meriah Regency is one of the arabica coffee areas in Indonesia. Generally, most of arabica coffees are grown in Andisols. This research aims to determine the nutrient content of N, P, K in andisols and arabica coffee leaves in the Bener Meriah regency. Data were collected from a 10-year-old arabica coffee tree planted on Andisols located at an altitude of 1200-1400 m above mean sea level and divided in five classes with different slopes, using the survey method and analysed descriptively. The results showed that andisols Bener Meriah had a total N content ranging from 0.09-0.51%. The P-available ranged from 0.3-12.81 mg.kg-1 and P-total content of 159.4-1246.7 mg.kg-1. The K-exchangeable content ranged from 0.17-0.52 cmol kg-1. Arabica coffee leaves contain N ranging from 0.85%-3.00%. The P content ranged from 0.10%-0.23%. Meanwhile, the K content ranged from 1.55%-2.33%. Furthermore, there is a close relationship between soil N-total and the N-nutrient of coffee leaves, soil P-available and P-nutrient of coffee leaves, and soil K-exchangeable and K nutrient contents of coffee leaves with r values of 0.78, 0.97, and 0.68 respectively.
Identification of feeding pattern and their impact on milk fatty acid profiles from traditional dairy cows in Pangalengan Sub-district
Authors: Anzhany D , Despal  , Toharmat T , Rofiah N , Nuraina N , Hamidah A N , Cusiayuni A
Published: January 2022

Fatty acids (FA) profiles especially conjugated linoleic acid (CLA) are commonly used to distinguish milk quality. However, its content is very sensitive and tends to change with a different type of feed. The study aims to identify the relationship between the feeding system and milk FA profile in the Pangalengan sub-district. The feeding system and milk FA profiles were studied using two-step post observatory research. Step one, milk was collected from 27 traditional-dairy farms using purposive random sampling and compare with a large-scale farm. The result shows that FA profiles vary greatly among traditional-farms especially for long-chain FA (LCFA) which was found in small concentrations. CLA content was also found higher in traditional-farms. Step two, five traditional-farms with the highest CLA milk content were observed for their feeding systems. Parameter observed including cow’s specification, feed type used, and feed intake. The best ration produced high milk CLA and production was the ration consisted of 38 % high-quality forages and 62 % commercial concentrate. Thus, it can be concluded that milk from traditional farms was better than milk from large-scale farms. The best milk CLA was produced with a combination of 38 % high-quality forages and 62 % commercial concentrate.
Identifying of unripe Ambon and Hijau banana fruits using computer vision and extreme learning machine classifier
Authors: Dewi C , Arisoesilaningsih E , Mahmudy W F , Solimun
Published: January 2022

The unripe Indonesian cultivar bananas of ambon kuning (Ambon) and ambon hijau (Hijau) after harvesting show a very close looking, green colour, similar size and shape, even Ambon one is costly than the Hijau. Hence in this study, identification was conducted using computer vision utilizing banana finger image taken with a mobile phone camera. The feature used as a differentiating feature is the shape feature and the skin texture feature of the fruit. The shape features were then extracted using morphological descriptor and convex hull, while the texture features were extracted using local binary pattern (LBP). The extreme learning machine (ELM) classifier was used to recognize both cultivars. A total of 76 banana finger imagery data were used in 3-fold testing. The test results showed that the combined use of shape and LBP features resulted in the highest accuracy, precision and recall values more than 93%. These results showed that the combination of the two features can effectively be used to distinguish the unripe Ambon and Hijau bananas.
The attack intensity of Paracoccus marginatus Williams & Granara de Willink (Hemiptera: Pseudococcidae) on papaya
Authors: Pramayudi N , Bakti D , Tobing M C , Husni
Published: January 2022

The mealybug, Paracoccus marginatus is one of the important insect pests in papaya (Carica papaya L.). The high potential for damage caused by this pest poses a threat to the production of papaya in Indonesia. The aim of this study was to evaluate the intensity of P. marginatus attack on papaya by observing variables such as plant varieties, planting seasons and cultivation methods. The area of observation plots was about 2.000 m2. The cultivation technique applied was monoculture with a spacing of 2.5 m x 2.5 m. Thirty plots of plants were collected from each plot of plants using diagonal sampling technique. The total number of leaves and the number of leaves attacked were recorded. Damage intensity was determined based on the category: no attack (score 0), mild 1-25% (score 1), moderate 26-50% (score 2), severe 51-75% (score 3), and very severe 76-100% (score 4). The attack intensity was higher in the dry season than rainy season. The results show that attack was higher in the dry season that rainy season. The intensity of the attack was also higher in Thai varieties both in the rainy and dry seasons. More intensive pest control shall be applied in the dry season and in the introduced varieties.
Physical and chemical quality of forage feed pellets with different types of materials and compositions
Authors: Suwignyo B , Subagya R D , Astuti A
Published: January 2022

The aimed of this study was to determine the physical (durability) and chemical quality of forage feed pellets with different raw materials and compositions. This study used two (2) weed raw materials with different forms, namely in the form of fresh and in the form of hay that has been milled. Each raw material was formulated and processed in the same way, a mixture of forage and rice bran, consisted of 90%: 20% and 80%: 20% (calculated based on dry matter, mixed in as fed), pelleted, then dried in the sunshine. Each treatment has three (3) replications. Dried forage pellets were tested with the PDI (pellet durability index) test and chemical quality test (proximate) in the Forage and Pasture Science Laboratory. The experimental design used a Randomized Completely Block Design where there were blocks of material types and blocks of material composition. The variables observed were physical quality in the form of PDI and chemical quality in the form of dry matter (DM), organic matter (OM), crude protein (CP), crude fibre (CF), extract ether (EE) and nitrogen-free extract (NFE). The data were statistically analysed with program SPSS version 26. If there was a significant difference, it was continued with the least significant different (LSD) test. The conclusion of this study was that the physical quality of forage pellets (PDI number) made from weed (Synedrella nodiflora) or Legetan was affected by composition, but neither hay nor fresh weed material affected its quality. The type of raw material in the form of hay and fresh affects the chemical quality of forage pellets in the form of DM, OM, CP, CF and NFE, but does not affect EE. EE was influenced by the composition of the pellets
Effect of using fresh palm oil and used palm oil as a fat liquoring agent to the chemical quality of leather from tilapia fish skin
Authors: Pertiwiningrum A , Nugroho K E , Roufi M A N , Parameswari A A , Pastawan V
Published: January 2022

Tilapia skin has a high value in the form of tanned tilapia skin. One of the factors that play an important role in the tanning process is the using of tanning agents. This research was carried out by vegetable tanning to the tilapia fish skin using selected concentration of fresh palm oil and used palm oil. The study aims to find out the chemical quality of leather through the using of fresh and used palm oil as fat liquoring agent in the vegetable tannery process. The same concentration of fresh palm oil (10%), and used palm oil (10%) were used in this study. The parameter of fat content, and water content as chemical quality was observed in triplicates. Based on the results, the fat content of the leather using fresh palm oil (19.265%) was significantly increased (p<0.05) compared to used palm oil (15.825%), while the water content was also significantly different (p<0.05). In conclusion, the addition of palm oil improved the moisture of tilapia fish skin and become softer that can be used for commercial products, and it became the alternative material that could be use in vegetable tannery processing.
Impact analysis of coffee production in reducing poverty in Aceh Tengah
Authors: Rahmaddiansyah  , Fajri  , Zulkarnain  , Dimas Muhammad , Bagio
Published: January 2022

The plantation is a strategic sector in poverty alleviation. In the Aceh Tengah district, coffee is one of the leading plantation commodities that can increase the pace of the regional economy. Gayo coffee has a distinctive aroma and has a high price. Although generally, the people there are active in producing coffee, there are still poor people. It is necessary to analyse the impact of coffee production in reducing poverty in farming communities in Aceh Tengah district. This study uses a probit regression analysis method to see the characteristics of coffee farmers with significantly different non-coffee farmers. It then uses a Propensity Score Matching (PMS) analysis to see the impact of coffee production in reducing poverty farming communities in Aceh Tengah district. This study indicates that the characteristics significantly differ between coffee farmers and non-coffee farmers are age, education, access to food, eating little food, and assets having a motorbike. The per capita consumption of coffee farmers is not higher than that of non-coffee farmers, but the holdings of coffee farmers are more than those of non-coffee farmers.
Genotype and phenotype variability of BC1F1 progenies from backcross of C3 and Koshihikari
Authors: Musfirah R , Bakhtiar  , Zakaria S
Published: January 2022

Improvement of local rice variety could be conducted by crossing it with superior varieties. C3 is improved line of Acehnese rice ‘Cantik Manis’ by crossing it with the introduced Chinese rice variety Yin Zhan to make their progenies have shorter lifespan and good productivity. Although C3 line has been improved, this variety still has lifespan for about ± 135 days. Koshihikari is Japanese rice variety with its lifespan about 80-90 days. It is though that Koshihikari has various semidwarf gene such as sd-1 or other semidwarf genes. The strategy that can be used to decrease harvesting period of C3 is by crossing this variety with Koshihikari to insert semi-dwarf gene such as sd-1. The research was conducted to analyse the existing of sd-1 gen and phenotypic performance of their progenies specially in BC1F1. The seed of BC1F1 were found by crossing 2 prospective F1 plants (T8 and T10) with C3 parent. Molecular analysis showed that the whole progenies BC1F1-T8 inherit sd-1 gene (100%). Phenotypic observation showed the whole progenies had similar architecture as their parents with average heights at 45 DAP ranged from 74-91 cm, and number of tiller range from 3-9 tillers. Whereas in BC1F1-T10 progenies, there were 11 plant from 12 plants inherit sd-1 gene (91.7%). These progenies had average heights at 45 DAP ranged from 75-88 cm, and number of tiller range from 6-13 tillers.
Decomposing total factor productivity of SMEs in agricultural sector in Aceh, Indonesia
Authors: Majid M S A , Faisal F , Fahlevi H , Azhari A , Juliansyah H
Published: January 2022

This study measures and decomposes the Total Factor Productivity (TFP) of the SMEs in the agricultural sector across 23 regencies/cities in Aceh province, Indonesia during the 2015-2019 period. Using Data Envelopment Analysis (DEA), the study found a low level of SMEs’ productivity during the study period. The SMEs in Aceh province recorded different levels of TFP. Overall, the SMEs’ TFP has slightly declined, contributed mainly by an increase in efficiency level and a decline in the technical efficiency change. These findings showed the importance of adopting advanced agricultural-related technologies and implementing good SMEs’ governance principles to further improve SMEs’ TFP. Finally, the government must prioritize promoting non-productive SMEs across the 23 regencies/districts in the province by offering sufficient financial aids and conducting professional managerial training programs.
Exploration, isolation and characterization of indigenous rhizobacteria from patchouli rhizosphere as PGPR candidates in producing IAA and solubilizing phosphate
Authors: Halimursyadah H , Syamsuddin  , Nurhayati  , Rizva DN
Published: January 2022

Microorganisms that are active and aggressive colonizing the rhizosphere are known as rhizobacteria. They are able to act as biofertilizers, bioprotectants, biostimulants and bioremediation. This study aims to identify and characterize groups of rhizobacteria present in the patchouli rhizosphere that can produce IAA compounds and have the ability to solubilize phosphate in the soil. Soil samples were taken from the patchouli rhizosphere at Purwosari Village, Nagan Raya, Aceh Province, Indonesia. This study used quantitative and qualitative descriptive analysis through serial dilutions to obtain rhizobacterial strains. Parameters observed were macroscopic and microscopic characteristics, gram test, IAA production and phosphate solubilization. The study obtained 37 isolates of rhizobacteria from Purwosari (PS), comprising 25 isolates of gram positive and 12 isolates of gram negative. The rhizobacteria PS 5/1 produced the lowest IAA at 21.66 ppm, whereas isolate 5/6 C produced the highest IAA at 83.38 ppm. Twenty-five isolates of rhizobacteria could solubilize phosphate while the remaining 12 isolates did not have this ability. The rhizobacteria PS 7/1 resulted in the highest PSI at 2.55 and isolates PS 8/7 produced the lowest PSI at 1.33. The rhizobacteria isolates that can produce IAA and phosphate solubilizing have the potential to be used as PGPR candidates.
Genotypic and phenotypic correlations among coffee leaf rust symptoms of Arabica coffee genotypes in North Sumatra. Indonesia
Authors: Malau S , Sihotang M R
Published: January 2022

Coffee leaf rust (CLR) is a pandemic and a serious threat for coffee sustainability in many coffee producing countries. To overcome this CLR, the world’s consensus is to use of resistant cultivars which can be created through coffee breeding program. This research aimed to study genotypic and phenotypic correlations between CLR symptoms of seven arabica coffee (Coffea arabica L.) genotypes that were selected from different districts of North Sumatra Province, Indonesia. This experimental research using a randomized complete block design with three replications was conducted at the experimental garden of the Faculty of Agriculture, Universitas HKBP Nommensen in Medan. The result of this study indicate that leaf rust severity (LRS) had a genotypic component variance of 86.8% which indicated that LRS was controlled more dominantly by plant genetics than other unknown factors. Severity indicated by LRS showed no genotypic and phenotypic correlation with dispersal indicated by branch rust incidence (BRI) and leaf rust incidence (LRI). BRI genotypically correlated with LRI. The results of this study could contribute to resistance coffee breeding for CLR.
The comparison between cyber extension and traditional interaction in the farmers environment during pandemic
Authors: Rizkiansyah M , Ariestyani A , Yunus U
Published: January 2022

Data from the Indonesian Seed and Farmers Technology Association data shows that 22 percent of Indonesian farmers have used smartphones to obtain agricultural information. But many farmers still struggle to get information especially in the pandemic era. This research is to find out how the comparison of information delivery patterns between traditional media and cyber media on farmers in Bangil. Indonesia. This research theory uses the theory of cyber extensions. This research method by, observe online media, interviewing several farmers in Bangil and supported by survey data to 85 farmers in Bangil. The results showed that although cyber media began to enter as one of the sources of information for farmers, only a few were dependent on online, while the rest still relied on information from extension methods. Counselling still needed as a connection between farmers and Internet.
Early determination of fetal sex in goat a comparison between real time PCR and ultrasonography
Authors: Hussein S A , Karam K M
Published: January 2022

The point of the current study is to assess the productivity of the real time PCR and ultrasound techniques in early determination of fetal sex in Iraqi singleton pregnant goats. Our investigation has been led in Iraq, Al-Diwanya city from 10/8/2020 – 15/1/2021. The examination incorporates 45 singleton pregnant Iraqi goats, which initially inspected by ultrasound to affirm pregnancy and to decide the fetal sex depending on the restriction of the genital tubercle of the goat fetuses, after that, blood specimens had been gathered from the jugular vein of all examined does to detect fetal sex by discovery of AMLX and SRY genes in the circling cells free fetal DNA (ccffDNA) in these maternal blood specimens by utilizing real time PCR. Our outcomes showed an exceptionally high level of accuracy in real time PCR in contrast with the ultrasound strategy. The outcomes were affirmed by the true fetal sex after parturition in the inspected does. The complete symptomatic rate were 51.11% (23/45) and 97.78% (44/45) for ultrasound and PCR strategies separately. The exactness level of genuine analyzed female and male caprine kidding were 58.33% (7/12), 48.48% (16/33), and 100% (12/12), 96.97% (32/33) for ultrasound and real time PCR techniques separately. While the exactness rates of the two techniques utilized in this investigation for early caprine fetal sexing in respect to early pregnancies periods analyzed uncovered 100% (13/13), 96.3% (26/27), 100% (5/5), and 61.54% (8/13), 40.74% (11/27), 80% (4/5) in early pregnancy periods (58-62, 63-67, 68-73) days for real time PCR and ultrasound strategies individually. In conclusion our outcomes revealed a huge predominant exactness and productivity in fetal sexing in Iraqi singleton pregnant does in early development periods, with very high accuracy in real time PCR in compare to ultrasound techniques.
Seed treatment using rhizobacteria as plant growth promotion of two chili variety (Capsicum annuum L.)
Authors: Syamsuddin  , Halimursyadah  , Samingan  , Maulidia V
Published: January 2022

The research aims to find out the effect of pre-germination treatment seeds using rhizobacteria as plant growth promotion of two varieties of red chili peppers in the field. The experiment used a randomized design of factorial groups. Factors studied were varieties (V) and rhizobacteria types (R). The variety factor consists of 2 varieties namely PM999 (V1) and Kiyo F1 (V2). While the type of rhizobacteria factor tried consists of 8 treatment, namely, control (R0), Azotobacter sp. (R1), B. megaterium (R2), P. atmuta (R3), B. alvei (R4), Flavobacterium sp. (R5), B. coagulans (R6), B. firmus (R7) and B. pilymixa (Rs). Each treatment was repeated 3 times, so there were 48 experimental units. Each unit of experiment is represented by 5 sample plants. The data was analyzed using ANOVA and continued with DMRT test at real level α = 0.05. The results showed that vegetative growth and production of chili plants until the age of 45 days after planting in each variety is not dependent on the pre-germination treatment of seeds with rhizobacteria. But the varieties of chili plants used affect vegetative growth and production. PM999 varieties are superior to the Kiyo F1 variety. Pre-germination treatment of seeds using rhizobacteria is relatively effective in improving vegetative growth and yield of chili plants. Among the 8 isolates rizobacteria isolate Azotobacter sp., B. megaterium, B. coagulants, Flavobacterium sp., and P. atmuta relatively effective to provide an increased effect on the growth and production of chili plants.
Shelf life prediction of straw mushrooms (Volvariella volvacea) based food enhancer using accelerated shelf life testing method
Authors: Sadli S , Erfiza N M , Anam A , Misrahanum
Published: January 2022

Food shelf life is related to food safety since consumers need to be informed an expired date of the food product. This study aims to determine shelf life of natural food enhancer based on straw mushroom (Volvariella volvacea) using Accelerated Shelf Life Testing (ASLT). Determination of shelf life was carried out at 30, 40, 50°C followed by descriptive sensory (colour, aroma, taste) and moisture content analysis for 28 days. Further data of those parameter over storage time were plotted into a graph to obtain a linear regression equation of zero-order and first-order. Then relationship between ln slope (k) and storage temperature 1/T (°K) was plotted in a linear regression to determine activation energy. Equation of linear regression from the lowest activation value then was used to calculate the shelf life of the product. The taste parameter on zero-order was used in shelf life determination as the critical quality because it has the smallest activation energy as 1708.39 cal/mol. The Arrhenius equation then was calculated using this value to obtain degradation constant (k). The results showed that shelf life of the straw mushroom based food enhancer were 77.58 days at 30°C, 70.85 days at 40°C and 65.07 days at 50°C.
Technical efficiency of rice farming in Aceh Province, Indonesia
Authors: Gunawan H , Majid M S A , Masbar R
Published: January 2022

This study measures the technical efficiency of rice farming in Aceh Province, Indonesia. A sample of 5,351 households from the 2017 Household Farming Cost Structure Survey conducted by the Central Bureau of Statistics of Aceh Province, Indonesia were gathered and analysed using the Data Envelopment Analysis (DEA). Three inputs (i.e., number of labour working days, fertilizer, and seeds) and one output (i.e., number of rice harvest) were used to measure the technical efficiency of rice farming in the province. The study recorded a very low average level of technical efficiency either using a Constant Return to Scale (CRS) or a Variable Return to Scale (VRS) approaches. Two inputs were found not optimal for rice farming activities, namely the number of labour working days and the use of fertilizers, while the use of seeds was found optimal. The study suggests that the farmers should use fertilizers proportionately to the land area. The use of agricultural technology should be intensified to minimize the use of excess labour to reduce wage spending.
Microorganism growth profiles during fermentation of Gayo Arabica wine coffee
Authors: Sulaiman I , Hasni D
Published: January 2022

Coffee is a non-alcoholic beverage that is consumed globally due to its specific flavour and functional properties. Nowadays coffee is diversified based on its coffee varieties, brewing methods, and bean processing techniques. Wine coffee is a commercial name for fermented coffee, a new coffee diversification product. Wine coffee is produced by fermenting coffee cherries for 30 to 60 days. As a new product, the process is not well studied. This research aims to explore the microorganisms’ activity and its profile growth during 30 days of fermentation. The documentation of pH and temperature, and microbial sampling during coffee cherry fermentation were conducted seven times, started at 0 days; 2 days; 4 days; 6 days; 8 days; 10 days; 12 days; 14 days; 16 days; 20 and 30 days. The results showed that pH decreases and temperature increases during fermentation. pH started from 5.0 and down to 3.9 when fermentation is terminated after 30 days, whilst the temperature slightly changes from 25°C to 30°C. The microorganism’s population shows the presence of yeast, lactic acid (LAB) and acetic acid bacteria (AAB) in wine coffee production. The yeast population increases in the mid fermentation as the cherries are damaged and provide suitable nutrition for the yeast. LAB also co-exists at a similar stage. Further research should be done, especially to understand the interaction mechanism between yeast and yeast, yeast and LAB, and yeast and AAB.
Effect of incorporating different types of Sentang tree waste particle on the thermal stability of Wood Polymer Composite (WPC)
Authors: Zakaria A M , Jamaludin M A , Zakaria M Z , Hassan R , Bahari S A
Published: January 2022

This article presents the potential use of tree waste materials such as the leaves (L), branches (B) and trunks (T) of Azadirachta excelsa (Sentang) tree in the production of wood polymer composite (WPC). The WPC was fabricated from high-density polyethylene (HDPE) as bonding matrix, maleic anhydride (MA) as coupling agent, and Sentang tree waste particles (L, B and T) as filler, prepared using twin-screw extruder followed by injection moulding machine. The effects of incorporating these types of Sentang tree waste particle (at 35% and 45% particles loading by weight) on the thermal stability of WPC were reported. The chemical compositions of L, B and T were also determined and their influences on the thermal stability of WPC were discussed. The thermal behaviour was determined by using thermogravimetric analysis (TGA), whereas the chemical analysis using Technical Association of the Pulp and Paper Industry (TAPPI) methods. The addition of these tree waste particles as filler has increased the thermal stability of WPC compared to virgin HDPE (without any particle incorporation). The highest mass loss was experienced by virgin HDPE. It was also observed that chemical compositions of the particles played vital role in influencing the thermal stability of WPC.
Household spending decisions analysis of coffee farmers in Aceh Tengah District
Authors: Baihaqi A , Fauzi T , Susanti E , Hamid A H , Rasmikayati E , Moulana R , Marzani A H
Published: January 2022

Farmer household income is certainly very closely related to expenditure. Coffee farmers in Aceh Tengah spend their income on consumptive and productive expenditures. This study aims to find out how the consumptive spending decisions and productive spending decisions of coffee farmers in Aceh Tengah District are described and to find out how the correlation between coffee farmers’ income and consumptive and productive spending decisions. The data used in this study are primary and secondary data. The analytical method used is descriptive statistics and Chi-Square analysis. The results showed that the consumptive expenditures of coffee farmers in Aceh Tengah District had a high category with a percentage of 42.2% or 62 farmers, while for productive expenditures of coffee farmers in Aceh Tengah District had a low category with a percentage of 45.6% or 67 farmers. The results of the Chi-Square analysis, namely from the results of the two analyzes, can be seen that the significance value of the correlation between income and consumptive and productive spending decisions is 0.000, which means that there is a correlation because of the Asymp value. Sig < 0.05. Moreover, the contingency coefficient (r) has a high (0.61-0.80) and moderate (0.41-0.60) correlation.
The shelf life of kawista fruit salad (rujak) dressing using Accelerated Shelf-Life Testing (ASLT) method
Authors: Hayati M , Arpi N , Rozali Z F
Published: January 2022

Rujak kawista sauce is one of the typical Indonesian foods made from palm sugar, tamarind, bird’s eye chili, nuts, and special fruits of kawista to enhance the flavour. There is no information about the shelf-life of rujak kawista sauce to date. Therefore, it is necessary to conduct a study on the storage time of the rujak kawista sauce to determine the product’s shelf life. This study used the ASLT method to determine the shelf life of rujak sauce. The sauce was stored at temperatures of 30°C, 40°C, and 50°C within 21 days storage time and was analysed every seven days. The analytical methods used to support the ASLT method are TBA, moisture content, FFA, total dissolved solids and pH. The result showed that TBA value was 0.046-0.19 mg malonaldehyde/kg, moisture content was 16.68-20%, FFA was 0.66-0.80%, total dissolved solid was 17.9-21.1°Brix, and pH was 3.1-3.5. Based on Arrhenius calculations, the shelf-life of rujak kawista sauce was two months.
Analysis of Gayo wine-coffee processing facility development
Authors: Juanda  , Muzaifa M , Martunis  , Wahyuningsih T
Published: January 2022

The Indonesian plantation sector plays an important role in the overall national economy. The development of coffee processing methods into a variety of products, including the relatively new product Gayo wine coffee, will provide added value for farmers. However, the main question that is often asked about relatively new ventures is how viable they are. Thus, a techno-economic analysis of Gayo wine-coffee processing facility development was aimed to answer how viable is the business to ensure sustainability. The results of this research are expected to add scientific information regarding the feasibility study of developing a sustainable Gayo wine-coffee processing facility. The research was conducted in Aceh Tengah District by conducting a comparative study to a micro-scale wine coffee producer in the location, theSyukran Kopi Wineprocessing facility. Analysis of the facility development was more focused on the technological and financial aspects. The research results considered that Aceh Tengah District is very suitable as a location for a wine coffee factory to minimize the purchasing costs. Moreover, the process of wine coffee production is more difficult than the process of common coffee production. However, the Gayo wine-coffee processing facility uses semi-modern technology like the common coffee processing facility. Besides, all financial indicators meet the financial feasibility criteria for five years economic life of the project. Sensitivity analysis also shows that in both scenarios, all financial indicators still meet the financial feasibility criteria, although decreasing the benefit make a higher impact on most values of the investment criteria than increasing the operational cost.
Application of colour, shape, and texture parameters for classifying the defect of Gayo Arabica green coffee bean using computer vision
Authors: Maghfirah A , Nasution I S
Published: January 2022

Coffee is the most important commodity in the trading industry. Determination of the quality of coffee is still done manually so that it cannot separate good quality coffee beans with bad quality coffee beans. This research conducted the development of a visual-based intelligent system using computer vision to be able to classify the quality of rice coffee based on the Indonesian National Standard (SNI). The models used in the study are the K-Nearest Neighbour (K-NN) method and the Support Vector Machine (SVM) method with 13 parameters used such as; area, contrast, energy, correlation, homogeneity, circularity, perimeter, and colour index R(red), G (green), B (blue), L*, a* and b*. A total of 1200 Arabica green coffee bean captured using Kinect V2 camera with training data of 1000 samples and testing data of 200 samples.
The use of near-infrared reflectance spectroscopy (NIRS) to predict dairy fibre feeds in vitro digestibility
Authors: Zahera R. , Sari L.A. , Permana I.G. , Despal
Published: January 2022

Information on dairy fibre feed digestibility is important in ration formulation to better predict dairy cattle performance. However, its measurement takes time. Near-infrared reflectance spectroscopy (NIRS) is a rapid, precise, and cost-effective method to predict nutrient value, such as chemical content and digestibility of feedstuffs. This study aims to develop a database for an in vitro digestibility prediction model using NIRS, including dry matter digestibility (DMD), neutral and acid detergent fibre digestibility (NDFD and ADFD), and hemicellulose digestibility (HSD). Eighty dietary fibre feeds consisting of Napier grass, natural grass, rice straw, corn stover, and corn-husk were collected from four dairy farming areas in West Java (Cibungbulang District of Bogor Regency, Parung Kuda District of Sukabumi Regency, Pangalengan District of Bandung Regency, and Lembang District of West Bandung Regency). The spectrum for each sample was collected thrice using NIRSflex 500, which was automatically separated by 2/3 for calibration and 1/3 for validation. External validation was conducted by measuring 20 independent samples. Calibration and validation models were carried out by NIRCal V5.6 using the partial least squares (PLS) regression. The results showed that all parameters produce r2> 0.5 except for ADFD. Relative prediction deviation (RPD) > 1.5 was only found in hemicellulose digestibility prediction. RPL (SEP/SEL) <1.0 were found in DMD and hemicellulose digestibility. It is concluded that hemicellulose digestibility can be predicted using NIRS accurately while other parameters need improvement.
Screening factors affecting chitosan extraction from mud crab (Scylla sp.) shell using microwave irradiation for the Response Surface Approach
Authors: Arpi N , Fahrizal  , Lubis Y M , Asmawati  , Fayyadh M T , Atmajaya Y
Published: January 2022

Extracting chitosan from crab shell using conventional method requires processing in strong acid and alkali conditions under high temperature with long reaction time. Microwave-based extraction proposes shorter processing time, and hence energy and cost efficient. This study intended to screen factors affecting the extraction of chitosan from mud crab shell using microwave irradiation. The factors would be used in Response Surface Methodology (RSM) approach to obtain the optimum conditions for chitosan extraction. Microwave irradiation was employed in all of the three steps of chitosan extraction, the demineralization, deproteination, and deacetylation processes. A fractional factorial design was used to screen eight independent factors to determine the most significant ones to be optimized to determine the maximum value of four responses, which were yield, mineral removal, degree of deacetylation and moisture content. The results show that all of the main independent variables were significant in affecting minimal one of the 4 responses (P < 0.05). Mud crab chitosan had the degree of deacetylation of 87.72 – 95.13 %. Results of the screening analysis concluded, the main independent factors that are going to be applied in the optimization study are NaOH concentration, microwave oven power, and reaction time in deacetylation process.
Effect of grated coconut and water ratio and commercial cheese starter percentage on characteristics of soft cheese made from coconut milk
Authors: Yunita D , Mariska D , Rohaya S , Varizki E , Gkatzionis K , Mugampoza D
Published: January 2022

The aim and objective of this research was to produce a soft cheese made from coconut milk and to examine the effect of grated coconut:water ratio (1:1, 1:2 and 1:3) and percentage of commercial cheese starter culture (1% and 1.5%) on its characteristics. The study was conducted using a factorial randomized block design. After two weeks of storage at 4°C, the cheeses (18 samples) were analysed for total lactic acid (LAB) counts, pH, and fat content. The lowest-fat coconut cheese was analysed for proximate and spreading ability. The results showed that the grated coconut:water ratio had a significant effect (P≣0.01) on the total LAB counts, pH value, and fat content of the cheese. The optimum formulation for soft cheese was selected based on the lowest pH (4.64) and fat content (42%) which was reached by using coconut and water 1:1. However, the spreading ability of this cheese could be improved by optimising the growth of starter cultures, water removal and adding stabilizers.
Increase in body weight and protein retention on meat chicken due to the addition of probiotics and digestive enzymes in fermented diet containing maggot flour and local materials
Authors: Yaman M A , Nasution U , Allaily  , Daud M , Zulfan
Published: January 2022

The purpose of this study was to determine the growth response of meat chickens due to the addition of probiotics and digestive enzymes in the fermented diet containing maggot flour and local materials. The research was carried out at Field Laboratory of Animal Science, University of Syiah Kuala-Banda Aceh, Indonesia for 66 days. A total of 100 meat chickens were designed using a completely randomized design (CRD) consisting of 5 treatments, namely P0 = 100% fermented ration (control), P1 = 0.5% probiotic + 0% digestive enzymes + 100% fermented diet, P2 = 0% probiotic + 0.5% digestive enzymes + 100% fermented diet, P3 = 0.5% probiotic + 1% digestive enzymes + 100% fermented diet, P4 = 1% probiotic + 0.5% digestive enzymes + 100% fermented diet with 4 replications. The data obtained were analyzed using ANOVA (Analysis of variance) and significant difference of data was analyzed by Duncan’s multiple distance test. The results showed that the addition of probiotics and digestive enzymes with different levels of administration in the fermented diet had a significant effect (P<0.05) on the increase in final body weight and percentage of protein retention. The best results were obtained on chicken fed on fermented diet contained 0, 5% digestive enzymes by increasing on final body weight, protein retention, feed conversion and feed efficiency which were higher than fermented feed containing probiotics. In conclusion, it was well known that digestive enzyme effected synergistically on fermented diet in increasing protein retention resulted a higher final body weight of meat chicken.