bluuebunny/crossref_metadata_2025 huggingface dataset:
The impact of students’ online-games playing on social awareness (case study of 5th graders in Nglames, Madiun)
Authors: Hanif M , Chasanatun F , Rifa’i A
Published: May 2021

This study aims to describe the impact of students’ habits of playing online games on social care in grade 5 at SD Negeri Nglames 01, Madiun Regency. This research uses a qualitative approach with a type of case study. Sources of data used in this study are primary data sources and secondary data sources, while the data collection techniques are observation, interviews and documentation. The validation used to test the truth is the triangulation of research sources. Data analysis used the interactive model of Miles and Huberman.

From the research that has been done, it shows that as many as 83% of students play online games with a play duration of more than 5 hours in one day, 17% of other students play online games with a playing duration of 4 to 5 hours in one day. The habits of students playing online games are influenced by friends, family activities and concerns, the environment they live in. Another negative impact due to the habit of playing online games affects sleep quality, diet, and some children imitate the style of play played and practiced with their peers in real life. The positive impact due to the habit of playing online games is to increase the vocabulary of foreign languages, namely English. The negative impact is more dominant due to the habit of playing online games.
Assessing Prior Knowledge and Needs Assessment for Virtual Laboratorium Development
Authors: Umamah N , Subchan W , Puji R P N , Mahmudi K
Published: May 2021

The University of Jember as a centre for biotechnology research in Indonesia also has the responsibility of developing biotechnology research results for the public. The urgency in fostering public understanding of biotechnology needs attention. Based on the results of a survey conducted, it shows that 75% of Jember University students do not understand biotechnology and the superior biotechnology products of the University of Jember. One way of developing this biotechnology information to the public is through the use of learning media. The research objective was to analyze the virtual needs of biotechnology laboratories for agriculture and health. The results show that students in higher education ranks have standard knowledge of virtual laboratories. Students also need skills in developing virtual laboratories and providing laboratories in learning and practicum. This shows that the development of a virtual laboratory is required to develop effectiveness and improvement of students’ skills in higher education.
The effectiveness of the digital books’ usage to improve the XII IPS 3 class students’ motivation at SMAN Pakusari Jember
Authors: Diarta F , Tiara  , Kantun S , Sari D E
Published: May 2021

This research aims to determine the effectiveness of the digital books’ usage in increasing student motivation in XII IPS 3 class at SMAN Pakusari Jember. The method used in this research is descriptive qualitative. The use of digital books in learning is useful to make it easier for students to learn and it also can reduce the weaknesses in printed books. The students feel easy and confortable to use them in learning process, so it increases the students’ motivation at XII IPS 3 of SMAN Pakusari. The results showed that the use of digital books was very effective in increasing student motivation. The score of student learning motivation before using digital books is at a value of 3.4 which is included in the medium category. After using digital books in the learning process, the student’s motivation score increased to 4.5 which is in the high category. For further research, it is hoped that researcher can use digital books with more complete features and materials than the digital books used in this study.
Implementation Of STMCpE Textbooks On Students’ Problem Solving Skill
Authors: Indrawati  , Hariyadi S , Budiarso A S , Anjarwati E
Published: May 2021

Problem solving is a higher level of skill than conceptual understanding. Problem solving skills require a logical process in solving a problem. Problem solving is a higher level of skill than the mastery of concepts that requires a logical process in solving a problem. The purpose of this study was to determine the effect of STMCpE textbook implementation on students’ problem solving skills. This research is a quasi-experimental design with nonequivalent control group design. Data collection was obtained from the results of problem solving skills tests conducted in the experimental class and the control class before and after learning. Pretest is used as initial data of student ability and posttest data is used as data to test the effect of learning. Test the effect of learning using ANCOVA. The result showed that the problem solving skills of students who studied with STMCPE textbooks was higher than students with conventional learning with a significance value of 0.000 <0.050. The percentage of effect of the application of the STMCpE textbook was 50.4%. This shows that the problem solving skills of students who learn with STMCpE textbooks are better than students who study using school textbooks.
Work-family conflict and organizational commitment of female lecturers of Nahdlatul Ulama University of Surabaya: an investigation of job satisfaction as a mediator using partial least square
Authors: Karya D F , Zahara R , Anshori M Y , Herlambang T
Published: May 2021

In spite of the importance of woman lecturer perception of work-family conflict and its influence on organizational commitment, job satisfaction can be used as a mediator, this study aims to examine an indirect influence of work-family conflict on female lecturers’ commitment to their organization. This study employed a survey of 91 female lecturers of Nahdlatul Ulama University of Surabaya. In exploring the complex relationship among work family conflicts (i.e. work interferes family and family interferes work), job satisfaction and organizational commitment, the researchers utilized partial least square to overcome the weaknesses of linear regression models. In this research, we found that female lecturers’ perception of work-family conflict was negatively related to their level of organizational commitment. In addition, perception of work interfere family and family interfere work had an indirect impact on the female lecturers’ organizational commitment through job satisfaction. This study contributed to the literature by examining organizational commitment in light of female lecturers’ perception of work family conflict and job satisfaction using partial least square to explore the complex relationship among organizational factors.
The antecedents of employee’s performance: case study of Nahdlatul Ulama University of Surabaya, Indonesia
Authors: Mardhotillah R R , Karya D F , Saadah C , Rasyid R A
Published: May 2021

The success of an organization in achieving its goals is not separated from the existence of creative and quality Human Resources (HR). Employee participation in doing the best for the organization’s success. Human resources are a determining factor in carrying out good work to achieve organizational goals for the better. The purpose of this study was to identify the influence of Organizational Citizenship Behavior (OCB) on employee performance with job satisfaction as a mediating variable. The sample in this study were 70 permanent employees of the education administration of the Nahdlatul Ulama University in Surabaya, using total sampling techniques. This research is quantitative, in collecting data by distributing questionnaires then analyzed using method Partial Least Square (PLS)with SmartPLS 2.0 software. The results showed that Organizational Citizenship Behavior (OCB) had a significant direct effect on employee performance and job satisfaction, and job satisfaction had a significant direct effect on employee performance. This study also shows that job satisfaction can mediate the influence of Organizational Citizenship Behavior(OCB) on partial employee performance.
The shifting medium class consumption behavior era pandemic covid-19 of Jember district’s citizen
Authors: Sukidin  , Kantun S , Suharso P
Published: May 2021

Writing this article aims to analyze the shift in the urban middle class’s consumption behaviour in Jember during the Covid 19 pandemic. The research method used is a survey method with a quantitative approach. Data entry is carried out through a questionnaire distributed via a google form. Data analysis used structural equation modelling (SEM). The results showed that there was a shift in the way of consumption and consumption patterns during the pandemic. Consuming is no longer done by direct interaction between buyers and sellers, but is done online. Consumption patterns are mostly aimed at primary needs because during the Covid 19 pandemic, many regulations did not allow people to travel, gather and use other free time outside the home.
Sorting some fractions by using a graph area shading (GAS) technique
Authors: Chususiyah S , Dafik  , Prastiti T D , Farisi M I , Safiati O A , Kurniawati E Y
Published: May 2021

Fractions are one of the mathematics topics that have been taught starting in grade two on elementary school. For kids, understanding a fraction is not so simple, especially in sorting fractions, ascending or descending. A fraction consists of two part numerator and denominator. A common technique frequently used in sorting some fractions is making the denominators of those fractions are the same, and compare the numerator which on is greater or less than other. This technique requires a long and slightly complicated process. The researchers will study a new technique for sorting fractions, namely the Graph Area Shading (GAS) technique. By a graph, we mean a set of vertices together with edges representing a specific relation. The simplest graphs are path and cycle. We will use some other graphs such as wheel, friendship and fan graphs. This technique is considered to be pretty much easier for kids to sort the fractions.
On the shrimp skin chitosan STEM education research-based learning activities: obtaining an alternative natural preservative for processed meat
Authors: Gita R S D , Waluyo J , Dafik  , Indrawati
Published: May 2021

Elaborating Science, Technology, Engineering, and Mathematics in learning activities is now getting important, especially to improve the STEM literacy of the students of school age or higher. For the higher age students, elaborating the STEM education should encourage them to raise their higher-order thinking skills. Thus the implementation of research-based learning together with a STEM education will be a good model in designing learning activities. Meanwhile, in STEM education, integrating some social real-life problems becomes the main issue. In this study, we will focus on the preservation process of food or meat. The biggest problem, in this case, some preservatives, however, contain harmful substances, like formalin and borax. Under STEM education, we will guide students in research-based learning activities to use chitosan made from shrimp skin to be a natural preservative substance. The objective of this study is to design the research-based learning activities under the STEM approach on the use of chitosan preservatives for processed meat.
The price analysis of palm oil commodity in Banjarmasin South Kalimantan
Authors: Dahniar  , Difa S I Al
Published: May 2021

This study aimed to analyze the price of oil palm commodity at Banjarmasin, to develop cost component and impacts on Government policies in the oil palm sector. The difference in calculation of cost components between the cost of production of farmers from Permentan No.14/Permentan/OT.140/2/2013. The research method used consists of (1) Field research, (2) Library research. The data analysis technique was in accordance with formula HTBS = K (HCPO × RCPO + HIS × RIS). The sampling technique used purposive sampling. The object of research was at Palm Oil Companies. The results of the study to calculate the cost components included in the cost production include: plant maintenance costs, indirect costs, unit depreciation costs. The difference in the calculation of the cost components of farmers only compares the total cost of production with the price of production, while the Government calculation is based on Permentan. Efforts that must be made in the difference in palm oil pricing if there is no win-win solution: there is a guarantee of transparency from the sales, both export and local, between farmers and oil palm entrepreneurs. For documents of volume, prices and costs should always be valid, the data are known by all parties.
Model of public health service in wetlands
Authors: Sompa A T , Muzdalifah S , Hakim A R
Published: May 2021

The purpose of this study is to describe the model of public health service in wetlands. The idea based on the governmental ecology perspective which states that the government behaviors influenced by environmental ecology. Wetlands occur where water meets land, include mangroves, peatlands and marshes, rivers and lakes, delta, floodplains and flooded forests, rice field, and even coral reef. The object of this research is Public Health Office of Hulu Sungai Utara District of South Kalimantan Province. District of Hulu Sungai Utara has the largest of wetlands area in South Kalimantan. The research method uses literature studies and system of public health service process analysis. The research uses primary and secondary data, the data collection techniques are deep interview, observation, and study library. The results of the study show the adaptive model of public health services in wetlands. The government facilitates people by collaboration program between government and traditional healers, coaching programs for remote parts in Hulu Sungai Utara District, and mobile services by speed boat. The public health services model in wetlands show the extra services by technical implementation units for every district overall.
Investigation on mechanical properties of fiber reinforced concrete
Authors: Nurwidayati R , Fardheny A F , Asyifha
Published: May 2021

Concrete has high compression strength but low tensile strength. Therefore fibers are added to enhance the tensile strength. South Kalimantan is one of Indonesia’s largest wetlands, and the banana tree is common in this area. After harvesting, they are accumulated or be burned, causing pollution. Utilizing banana tree waste as fiber in the concrete minimizes it. This paper investigated the effect of banana fiber length and percentage of fiber by volume fraction on the compressive of mortar, tensile, and compressive concrete strength. The correlation between the compressive and tensile strength was further established. The percentage of fiber used in this research was 0.1%, 0.2%, and 0.3%, and the length of the fiber was 7cm and 15cm. The results showed that the addition of banana fiber significantly improved the mechanical properties of mortar and concrete. The compressive strength of mortar with a fiber length of 7cm was higher than 15cm. The higher percentage of fiber causes the lower compressive strength of mortar. The compressive strength of fiber-reinforced concrete was 27.9 MPa, and the ordinary concrete was only 17.91 MPa. The tensile strength of fiber-reinforced concrete was 6.96 MPa, while the ordinary concrete was just 1.93 MPa.
Diversity of endophytic fungi isolated from benzoin-producing tree Styrax sumatrana
Authors: Hidayat A. , Susilowati A , Faulina S A , Elfiati D , Imanuddin R , Turjaman M
Published: May 2021

Styrax sumatrana, native to Sumatra island, Indonesia, is distinctive for its production of benzoin resin. The resin is used for medicinal treatments and commercially valuable. Fungal endophytes are known to produce various bioactive metabolites and may contribute to host resin production or properties. However, the diversity of culturable endophytic fungi associated withS. sumatranawere still underexplored. This study was conducted to examine the distribution and diversity of culturable endophytic fungi associated with tree parts; bark, stem, and leaves ofS. sumatrana. A total of 31 endophytic fungi isolates were obtained fromS. sumatranagrown in North Sumatera Province, from which 10 genera and 17 species were identified by internal transcribed spacer (ITS) sequence analyses. Among 31 isolates,Fusarium, Phyllostica, NeopestalotiopsisandPestaliopsiswere repeatedly isolated. The species richness S (10), Margalef index D’ (3.323), Shannon–Wiener index H’ (1.587), and Simpson diversity index Ds (0.756) and low dominant index λ (0.244) of endophytic fungi in the bark ofS. sumatranaindicated its high diversity in comparison to other parts of the tree. This finding provides a knowledge of the diversity and organ-type-specificity of endophytic fungal that could be used for biotechnological application in the future.
An assessment of birds and mammals in Wana Patra Lestari, PT Pertamina Refinery Unit V Balikpapan
Authors: Mukhlisi  , Adman B , Muslim T , Yassir I
Published: May 2021

Wana Patra Lestari (WPL) is a remaining forest in the center of Balikpapan City. It is located in the working area of PT Pertamina Refinery Unit (RU) V Balikpapan. Besides having cultural and historical value, the existence of the WPL area also has environmental service value as a habitat for birds and mammals. This study aims to analyze the diversity of bird and mammal species in the WPL area. We collected all related bird record by using a combination of point count and mist-netting methods. Furthermore, mammal was sampled by using a combination of line transect, live-trapping, camera-trapping, and also mist-netting survey. The results showed that in the WPL area 17 species of birds and 6 species of mammals were identified. There are 14 species of birds and 2 species of mammals added from previous studies. Of all the identified species, there is only one protected species in Indonesia, namely Elang Bondol (Haliastur indus). Periodic monitoring is needed to find out more about population dynamics and diversity of wildlife in the WPL.
The effect of application of compost and frass from Black Soldier Fly Larvae (Hermetia illucens L.) on growth of Pakchoi (Brassica rapa L.)
Authors: Agustiyani D , Agandi R , Arinafril  , Nugroho A A , Antonius S
Published: May 2021

Pot experiment was conducted to observe the effect of frass (insect feces) from Black Soldier Fly larvae (BSFL) as soil amendments at different application rates in comparation with other organic fertilizers on Pakchoi (Brassica rapa L). The experimental design was completely random with seven treatments, namely compost, compost+LOB (liquid organic biofertilizer), 5%, 10%, and 15% BSF frass, chemical fertilizer (NPK, equivalent to 10 kg/ha), and soil as a control. After 35 days planting, the result showed that Pakchoi cultivated with compost+LOB, compost, and BSF frass produced the highest biomass compared to control and NPK treatment significantly. The highest total plant weight was achieved in the treatment of Compost+LOB (24.4 gr), followed by 10% BSF frass (23.3 gr), compost (21.8 gr), 15% BSF frass (20.7 gr), 5% BSF frass (19,8 gr), NPK (1.3 gr ) and control soil (0.9 gr). While the chlorophyll content was not significantly different between all treatments, the application of BSF frass tended to be higher but with curly leaf symptoms than other treatments. The population of P solubilizing bacteria and the activity of PME-ase enzyme in soil were also higher in the treatment of compost, compost+LOB, and BSF frass compared to control and NPK treatment.
Enzymatic activity of bacteria isolated from the gut of Cylindroiulus sp.: future prospect for decomposing agent
Authors: Ni’matuzahroh  , Affandi M , Fatimah  , Trikurniadewi N , Abidin A Z , Khiftiyah A M , Sari S K , Ibrahim S N M M , Jannah M , Masrurin A R , Makrifah R L
Published: May 2021

MillipedeCylindroiulussp. is well known as decomposer invertebrate. Its ability to break down organic waste is related to microbiota in their gut. Gut bacteria are known to be able to produce enzymes which have the potential as an organic waste decomposing agent. This study aimed to obtain potential bacteria in producing hydrolytic enzymes from the gut ofCylindroiulussp. and to evaluate their enzymatic activities. Gut bacteria were isolated fromCylindroiulussp. living in the household organic solid waste composter. Furthermore, isolated bacteria were analyzed quantitatively for their amylase, cellulase, protease, whereas qualitatively for lipase activities using semi-selective media. In this research, nine bacterial isolates were obtained. Three isolates namely EKG A1, EKG A4, and EKG A5 were able to produce all of the enzymes and identified asBacillusgenera. The highest index of enzyme activity in amylase, cellulase, and protease were 2.13 ± 0.08, 2.56 ± 0.03, 4.49 ± 0.17, respectively.Cylindroiulussp. gut bacteria were prospectively applied to decompose organic solid waste.
Admixture study of Ongole grade cattle based on genome-wide SNP data
Authors: Volkandari S D , Rahmawati I , Cahyadi M , Adinata Y , Kusumaningrum R , Maharani D , Purwantara B , Subiharta  , Sudrajad P
Published: May 2021

We present population structure analysis of two differed Ongole grade cattle strains in Indonesia i.e., common Ongole grade (PO) and Kebumen Ongole grade (PO Kebumen). The aim of this study was to identify the genomic characteristic of both PO and PO Kebumen cattle strains. In this study, genotyping method of 15 PO and 25 PO Kebumen was carried out using an Illumina BovineSNP50 Bead Chip. In order to deeper analyses, we used additional 50K SNP data of 20 PO, 20 Nellore, 20 Brahman, 20 Simmental, and 20 Limousin that freely available in the data repositories. An estimation of the genetic population study was carried out using following approaches: pairwise fixation indices, heterozygosity and Nei’s standard genetic distance, and ancestral based admixture. These analyses revealed a B. taurus influence in PO but none in PO Kebumen. Furthermore, we also identified the close admixture of PO Kebumen to Nellore. Since Nellore was originated from Ongole cattle, we presume the PO Kebumen is the maintained Pure Ongole Breed in Indonesia.
Influence of mixture of Arbuscular Mycorrhizae fungi and rhizobia on growth and yield of soybean at tidal swamp land
Authors: Widowati T , Lekatompessy S J R , Nurjanah L , Simarmata R
Published: May 2021

Tidal swamp land is a marginal land which has the potential for enhancement of many agricultural crop growths and yields. The objective of this study was to investigate the effect of a bio-fertilizer containingArbuscular mycorrhizaefungi and a Rhizobium,Bradyrhizobium yuanmingenseon productivity of soybean at the tidal swamp land. The field experiment was established in a completely randomized design with three treatments and three replications per treatments. The treatments include fertilization (P) consisting of a 100% of standard dose of NPK (P1) and the use of biological fertilizers combined with NPK; 100% of standard dose (P2) and 50% of the standard dose (P3) per hectare. The results showed that the yield of soybean treated with bio-fertilizer and combined with 50% standard dosages of NPK could increase production up to 44.7% compared to P1.
Using in vitro technique for drought, heat, and combined drought-heat assay in potatoes
Authors: Handayani T , Watanabe K N
Published: May 2021

Drought and heat stresses are the significant abiotic stresses threatening the food crops, including potato. The in vitro technique is promising to conduct an abiotic stress assay. The assay of drought, heat, and combined drought-heat stress was conducted by using five potato lines. Polyethylene glycol (PEG) 8000 (25%) was used to induce drought stress. Heat stress was obtained by growing the plantlets at 35°C. Whereas placing the plantlets cultured in the media containing PEG 8000 (25%) at 35°C was applied to generate combined drought-heat stress. The results showed that four hours of abiotic treatments had no effect on growth of potato plantlets. The results showed that potato lines gave different responses to drought and combined drought-heat stress. Potato line 87HW13.7 wilted 8 hours after drought and combined drought-heat treatments, which became more severe by the time and died after 48 hours on combined drought-heat stress. Potato line 84.194.30 showed the wilting symptom after 24 hours due to drought stress and combined drought-heat stress and performed less wilting among five potato lines. The in vitro technique could differentiate the response of different potato lines to abiotic stress; therefore, this method would help the abiotic stress assay in potatoes.
Genetic relationship of parents and progeny derived from crossed pollination of Piper nigrum L. based on morphology and RAPD markers
Authors: Meilawati N L W , Darajat J , Bermawie N
Published: May 2021

Hybridization is meant to combine good characters to produce new individuals. This study aims to understand the genetic relationship of parents and progeny derived from crossed pollination. The study was conducted in the laboratory and greenhouse of the Indonesian of Spice and Medicinal Crops Research Institute. The plant materials used were female (N2) and male (LDL) parents, F1, F2, and their backcrosses. Morphological characters were observed in young plants grown in pots. Molecular analysis was performed with RAPD. Morphological and molecular data were processed with PBSTAT. The coefficient of diversity for the genetic relationship of parents and progeny derived from crossed pollination (N2 x LDL) based on morphology ranged from 12-50% or Similarity of 50-88%. The dissimilarity between parents (N2 and LDL) and both hybrids (LH 4-5 and LH 4-5-5) was 32%. The genetic relationships based on RAPD obtained diversity coefficients ranging from 40-80% or Similarity of 20-60%. The dissimilarity between parents (N2 and LDL) with both hybrids (LH 4-5 and LH 4-5-5) was 46%. Similarity-based on morphological characters is higher than on RAPD markers.
Characterization of sarcoplasmic protein in the meat using SDS-PAGE method
Authors: Baharuddin M , Amat H , Febryanti A , Sappewali  , Azis F
Published: May 2021

A characterization of the sarcoplasmic protein in the meat had been investigated. The method that was utilized in this study was SDS-PAGE (sodium dodecyl sulfate-polyacrylamide gel electrophoresis) which played a role in analyzing the molecular weight of the meat protein. The characterization of the molecular weight depended on the concentration of acrylamide gel that has been used. The result reported that using of 10% acrylamide gel showed difference of the molecular weight characterization from the sarcoplasmic protein. The difference of protein in the meat is on sarcoplasmic proteins. Protein with molecular weights of 50.8 kDa was not found in pork. Therefore, this molecular weight of the protein can potentially serve as a key for differentiating pork and other meats.
The effect of gibberellins soaking duration on germination frequency and growth of true shallot seed in the nursery
Authors: Wahyuni A N , Saidah  , Muchtar  , Irmadamayanti A , Syafruddin  , Padang I S
Published: May 2021

Gibberellins are growth regulators that can increase seedling germination of true shallot seed (TSS). This study aims to determine the effect of TSS soaking duration in gibberellins solution on germination and growth of two TSS varieties. The study was conducted from May to June 2020 in Kotarindau Village, Dolo SubDistrict, Sigi Regency. The study used Factorial Randomized Block Design with 2 factors, each repeated 5 times. The first factor is Variety, consisting of Trisula and Lokananta. The second factor is the Seed Soaking Duration (T), consisting of 4 levels which are No Gibberellin Soaking, 2 hours Soaking, 4 hours Soaking, and 6 hours Soaking. To determine the effect of treatment, analysis of variance was carried out, continued with Duncan’s Multiple Range Test (DMRT) at 5% when the results of variance showed significant differences. The results showed that varieties and soaking duration of TSS in gibberellins solution treatments have significant effect on the growth of TSS. The highest number of plant height and number of leaves was obtained in the treatment of Lokananta varieties with 6 hours soaking duration, but not significantly different from the treatment of the Trisula varieties with 2 hours soaking duration in the number of leaves parameters.
Response surface methodology for optimization of medium components for extracellular protease production by Enterococcus faecalis InaCC B745
Authors: Rohmatussolihat  , Lisdiyanti P , Sari M N , Sukara E
Published: May 2021

Enterococcus faecalis InaCC B745 was isolated from dadih, a traditional fermented milk from Bukittinggi, West Sumatra. Previous study shows that the lactic acid bacteria was able to produce protease. In this study, protease production was optimized using response surface methodology (RSM) with central composite design (CCD). The total of four variables and five-level combinations namely: 0-4% (w/v) of skim milk, 0-2 % (w/v) of yeast extract, 0-2 % (w/v) of glucose, and 0-2 % (w/v) of CaCO3. Statistical analysis showed that the production of protease by E. faecalis InaCC B745 is significantly influenced by skim milk, yeast extract, glucose, and CaCO3, combination of skim milk and yeast extract. The final concentrations of the optimized medium were 3% (w/v) skim milk, 1.5 % (w/v) yeast extract, 0.89 % (w/v) glucose, and 1.5 % (w/v) CaCO3. Under these conditions, the model predicted of protease activity was 60.637 U/ml or around 57.3% increased.
Improvement of yogurt quality from mushrooms and nuts by the addition of Amyloproteolytic from Lactobacillus satsumensis EN38-32
Authors: Khusniati T , Widiawati A , Yuningtyas S , Sulistiani
Published: May 2021

Yogurt made from the vegetable is good for human health. This study focused on improving the quality of yogurt from mushrooms and nuts with the addition of amyloproteolytic enzymes from L. satsumensis EN38-32. Pasta flour juice from oyster mushroom (Pleurotus ostreatus), button mushroom (Agaricus bisporus), soybean (Glycine soja), and mung bean (Vigna radiata) were used to make yogurt with milk yogurt as a comparison. The α-amylase activity was measured by the DNS method, while the protease activity was measured by formol titration. Reducing sugar was detected by the Bernfeld method, while degraded protein by titration. The AOAC method measured total acid and proximate analysis. The results showed that the increase in reducing sugar and the increase in total acid in oyster yogurt, button yogurt, and soygurt with and without the addition of amyloproteolytic enzyme from L. satsumensis EN38-32 was lower than that in mung bean yogurt with each value of 0.0169% and 0.0770% (p <0.01). Carbohydrate (11.30%) and protein (1.12%) in oyster yogurt were higher than button yogurt, while carbohydrate (13.95%) and protein (3.15%) in soygurt were higher than in mung bean yogurt. Based on its nutritional content, soygurt was the best yogurt compared to the others.
Kinematics motility of friesian-holstein sperm sexing in l-ascorbic acid treatments
Authors: Maulana T , Afiati F , Gunawan M , Kaiin E M
Published: May 2021

The study aimed to examine the kinematics motility and recovery rates of frozen-thawed Friesian Holstein bull sexing semen in the addition of l-ascorbic acid treatment. Semen collected from Friesian Holstein bulls with the minimum standard of sperm motilities for sexing sperm (60%), and abnormality (<20%) used for this study. Semen was diluted with final concentration 300x106 sperm/ml in Brackett-Oliphant (BO) medium. The sperms were sorted using the BSA column method. Sexing sperm were extended with Tris egg yolk (TEY) extender in addition L-Ascorbic Acid (LA) 0%, 0.25%, 0.5%, and 0.75% before freezing process. Frozen sexing semen was thawed for the kinematics motility evaluation with parameter; Tmot, Pmot, VAP, VCL, VSL, LIN, ALH, BCF, DAP, DCL and DAP using CASA system also recovery-rate evaluation. The results showed kinematics motility evaluation for 0.75% TEY-LA had lowest value (P<0.05) in Tmot, Pmot, velocity and distance compared to control group, 0.25% and 0.5% TEY-LA. The recovery rate 0.5% TEY-LA had highest values between among all treatment in X and Y frozen sexing semen. In conclusion, the addition of 0.5% l-ascorbic acid to tris egg yolk extender could be advantageous tool to improve the kinematics motility and increased recovery rates of Friesian Holstein sexing sperm.
Simulation of Fuel Cell Power Generation System Based on AMESim
Authors: Jiang Xue , Tao Yufei , Tang Chuanjun , Zhao Hongwei , Li Weilin
Published: May 2021

Fuel cell has become the main power source of the fuel cell electric vehicle due to its advantages of high ideal energy conversion efficiency, low noise, high reliability and maintainability. The fuel cell power generation system is an integrated system including the fuel cell stack. Its physical model covers many subjects such as electricity, thermodynamics, hydrodynamics and electrochemistry, which makes it difficult to change the simulation of fuel cell power generation system. In order to study the characteristics of fuel cell system, the model of proton exchange membrane fuel cell system is set up using AMESim. The model mainly includes fuel cell stack, gas supply subsystem, cooling subsystem and DC/DC converter. On this basis, the characteristics of fuel cell stack and its subsystems under dynamic conditions are analyzed.
Simulation research on the flow field performance of the supersonic separator for natural gas
Authors: Lv Jin
Published: May 2021

The separation of natural gas dehydration and de-heavy-hydrocarbons is an important part of natural gas treatment, the main purpose of which is to prevent liquid water in the later processing, transportation and storage of natural gas, and to prevent acidic gas dissolving in free water which will cause the corrosion of pipelines and equipment. This paper introduces a new type of natural gas separation technology— supersonic gas-liquid separation technology. Based on the working principle of supersonic gas liquid separator, using relevant theories such as fluid mechanics, gas dynamics and thermodynamics, the structure of Laval nozzle was mainly optimized and the flow field of the separator was simulated through ANSYS software, the distribution of the characteristic parameters such as pressure, velocity, temperature of shrink segment, throat, expansion segment of the supersonic cyclone separator nozzle were studied in this paper. The results show that the design of the nozzle structure meets the needs of low temperature, can make the water vapor in natural gas condense into small droplets and separate out, so as to achieve the goal of natural gas dehydration. Then, comparing the different design methods of Laval nozzle, the most reasonable design scheme is selected to improve the separation efficiency of the separator.
Analysis of injection pressure
Authors: Ding Xiangnan
Published: May 2021

In the daily production of water injection wells, oil pressure is a very important production parameter. According to the existing theory, oil pressure plus liquid column pressure is the injection pressure at the bottom of the well, but this theory is contradictory to some production phenomena. This paper analyzes this problem and concludes that pump pressure is the decisive factor of injection energy, which can better explain the practical problems in water injection production.
Application of Molecular Simulation Technology in Improving Oil Recovery
Authors: Feng Zhen , Xu Jianping , Ren Zongxiao , Ma Rui
Published: May 2021

With the continuous development of oil exploitation, the research on the oil industry has gradually shifted from macro to micro. Molecular simulation technology has attracted wide attention due to its advantages of saving costs, shortening the experimental period, and realizing the limit simulation conditions that are almost impossible under physical experimental conditions. Petroleum workers use molecular model to study the effects of different properties on adsorption and desorption. The results show that the adsorption capacity of CH4 increases with the increase of pore size and pressure, and decreases with the increase of temperature and water content. The interaction between clay minerals and CO2 was discussed, and various reactions formed after CO2 was inserted into clay minerals were discussed. Exploring the adsorption and aggregation behavior of surfactants on the interface and analyzing the influence of various properties of surfactants on oil displacement effect are helpful to optimize surfactants and improve oil displacement efficiency. Scientific research on microscopic seepage of polymer flooding has been carried out, and a large number of studies have been carried out on light hydrocarbon diffusion, polymer viscoelasticity and diffusion properties of small molecules in pores, which makes the evaluation of oil displacement effect more accurate. The application of molecular simulation technology in the above studies has obtained the properties that cannot be extracted from many macro experiments, which provides an effective method for the study of theoretical mechanism and better guides the actual production.
Study on the applicability of sand control fracturing technology in Lamadian oilfield
Authors: Kong Jie
Published: May 2021

At present, the proportion of water drive fractured wells is as high as 85.8%, and the proportion of repeated wells is as high as 47.7%. In view of this reality, the potential tapping objects are gradually transferred to isolated sand body, river channel edge and top of thick oil layer. Due to the limited fracture length ratio of conventional fracturing, the potential tapping effect is poor. Therefore, the sand body fracturing method is adopted for this section, that is, increasing the fracturing scale and improving the production degree of oil layer by increasing the fracture length ratio. According to the statistics of the effect of sand control fracturing well, combined with the sand body development characteristics, connectivity characteristics and injection production relationship, the influencing factors of sand control fracturing effect are analyzed, and the applicability of sand control fracturing technology in Lamadian oilfield is clarified.
Storage and transportation technology solutions selection for large-scale hydrogen energy utilization scenarios under the trend of carbon neutralization
Authors: Pan Weiwei , Wan Tian , Han Yang , Liu Shengzhi , Fu Jiang
Published: May 2021

This paper mainly introduces the main pain point of China’s civil hydrogen energy supply chain - the problem of storage and transportation, and analyzes the safety, economy and scale effect and other issues of the existing hydrogen energy storage and transportation, compares with other storage and transportation technology solutions, and comprehensively screens out the storage and transportation technology solution mainly based on liquid hydrogen technology. The liquid hydrogen technology solution has significant advantages over the existing compressed hydrogen system in terms of safety, economy and scale effect, especially for future large-scale hydrogen energy application scenarios. In addition, the future hydrogen energy storage and transportation system based on liquid hydrogen technology can help improve the overall utilization efficiency of country’s renewable energy, promote the country’s energy transition, promote the electrification of the country’s transportation sector, and help achieve China’s carbon emission reduction 2030/2060 target.
Calculating control area and reserves of single well by triangulation method
Authors: Xing Jishuang
Published: May 2021

The arithmetic average method is a conventional method to calculate the geological reserves. However, it ignores the influence of heterogeneity in the block, especially the faults. The calculated single well controlled reserves are often quite different from the actual status, which can’t guide the development actions accurately. Therefore, it is necessary to introduce a more accurate calculation method. The triangular network method introduced in this article can improve the accuracy when calculating the control area of single well in fault area, support to evaluate the control reserves of single well, and reflect the changes of geological reserves near each well point accurately.
Research on Lightning Protection Verification Based on Three-dimensional Model of Substation
Authors: Hu Junhui , Li Zan , Jing Tian , Hong Min , Hu Mingxun , Xu Wenjie
Published: May 2021

In the past, the lightning protection design of substations was carried out by manual calculation. The joint protection of multiple lightning rods and the joint protection of lightning rods of unequal height brought a huge amount of work to the calculation, which was low in efficiency and prone to errors. At the same time, the lightning protection design based on two-dimensional drawings cannot visually display the real lightning protection situation, and cannot reflect the correctness of the lightning protection results during the blueprint review process. The review experts need to repeat calculations to demonstrate. Computer simulation and calculation of lightning protection in substations can not only greatly improve work efficiency, but also visually verify the feasibility of the design scheme through the visual display of the three-dimensional design model of the substation. This thesis mainly studies the realization method and process of lightning protection design based on 3D software, and gradually realizes 3D visualization of lightning protection area and completes lightning protection verification.
Research on Key Technologies of Intelligent Control Switches in Distribution Networks
Authors: Guo Fusheng , Zhou Weihan , Wang Yongqing , Su Yongzhi , Wu Weiping , Li Weichao
Published: May 2021

With the development and widespread application of high-power power electronics technology, there is an interaction between distribution network voltage and reactive power and power quality. It is prone to operating over-voltage and closing inrush when closing, and reignition often occurs during opening. The voltage is too high, which far exceeds the voltage and insulation performance that the equipment can withstand, resulting in damage to the equipment. In response to the above problems, this article proposes an intelligent control switch closing and opening strategy to reduce the impact on the equipment during the reactive power compensation switching process. Considering the different dispersion of the intelligent control switch, the process of closing the parallel capacitor is simulated, and the effect of the intelligent control switch on the overvoltage and inrush current limitation is compared, which proves that the strategy is effective.
Bidding strategy of wind-solar hybrid generation system in the spot market considering bidding deviation penalty
Authors: You Daning , Liu Hanghang , Si Juncheng , Zhou Lei , Sun Mingyu , Jiang Ting
Published: May 2021

In recent years, as State Grid Shandong Electric Power Company is one of the key pilot construction units of the new strategy of “realizing the coordination and interaction of source network, load and storage”, renewable energy power generation systems have gradually changed from a subsidy object to an independent bidding subject when participating in the spot power market of Shandong Province. The uncertainty of renewable energy output and spot market price leads to the loss caused by bidding deviation when participating in the power market competition, and the income drops significantly. The good complementarity of wind and solar energy can reduce the fluctuation of renewable energy output and promote renewable energy consumption. First, the joint output probability distribution of a wind-solar hybrid generation system is simulated based on Copula function. Then, aimed at maximizing the bidding profit of the wind-solar hybrid generation system in spot market, a two-stage mixed integer stochastic optimization bidding model considering bidding deviation penalty is established. The conditional value at risk theory is used to evaluate the risk of renewable energy and electricity price forecast deviation, and the optimal bidding strategy is obtained.
Effectiveness of bacterial sulfidation flotation for the separation of malachite: Impact of pH, sulfide concentration and sulfidation time
Authors: Wang Xu , Chen Yaozong , Song Zibo , Liu Mengfei , Gan Min , Zhu Jianyu , Chen Daixiong
Published: May 2021

Previous research paid less attention on the mechanism and application of bacterial sulfidation in mineral flotation. In this study, sulfate reducing bacteria strains reduce sulfate to produce sulfides, which are used as sulfidizing reagents for malachite. Then, the system influence factors such as pH, sulfides concentration and sulfidation time are controlled. The results showed that the most suitable conditions of malachite bacterial sulfidation system were pH of 9.0, sulfide concentration of 140mg/L and sulfidation time of 15mins. For further study, SEM and FTIR were used to perform of sulfide film formed on the surface of malachite. The result of sulfide film on the malachite surface is compact, and the malachite flotation properties are greatly improved after bacterial sulfidation.
Research on Forecast of Water Demand in Jinzhou Based on Grey Model
Authors: You Kun , Kang Ning , Fu Jinxiang , Gao Yujia , Qian Weiyi , Wang Juliang
Published: May 2021

According to the related requirements of water demand prediction in Jinzhou, and based on the current situation of water resource carrying capacity in Jinzhou from 2011 to 2017 and the grey model, the water demand from 2021 to 2025 was predicted, and the grey GM(1,1) model of ecological water demand, virtual aquatic yield, residential water consumption and urban public water consumption was established. The results showed that the regional water demand showed a trend of slow increase, among which the urban public water demand had a larger growth space, while the ecological water demand and virtual aquatic production had a smaller growth range. The accuracy of the grey forecast model is more than 90%, It can provide a new way to forecast the main water use and total water demand.