bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative Analysis of Beef Cattle Farms Performance Before and After the Existence of Microfinance Institutions
Authors: Asnawi Aslina , Amidah Amrawaty Andi , Nirwana
Published: October 2020

The existence of Microfinance Institutions (MFIs) in rural areas is one solution for farmers in general, including beef cattle farmers. The limitation of capital ownership in farmers is one of the factors that cause the number of livestock ownership is also relatively small and low feed quality. The existence of MFIs expected can encourage the motivation of farmers in running their livestock business, increase income-generating and cattle ownership. This study aimed to examine the differences in revenue and cattle owned between before and after the farmer joined in the MFIs. Data collection using a questionnaire. This research was explanatory research and uses comparative test analysis. The results of the study showed that there were differences in farmers’ revenue and the number of cattle ownerships before and after joining the MFIs. This was due to the presence of capital or funds that can be accessed from informal funding institutions, generally, farmers used these funds to buy better breed, improve feed quality hence, it affected the performance of cattle production. This condition can affect the amount of cattle ownership and revenue obtained by farmers. Therefore, the role of MFIs was very large for the development of livestock businesses in rural areas.
Adoption of the mixed crop and livestock farming’s technology in Magelang Regency, Central Java
Authors: Ain Afrilia Widarni Nur , Astuti Andriyani , Andarwati Siti , Anggraeni Kusumastuti Tri , Romadhoni Surya Putra Ahmad
Published: October 2020

Mixed Crop and Livestock (MCL) farming provides opportunities for smallholder farmers to increase farm efficiency by using crop and livestock waste as the farming input resources. This study examined the correlation between farmer’s adoption level of MCL and their characteristics. Data were collected by multistage random sampling method through questionnaire for 132 smallholder farmers in five districts (Bandongan, Candimulyo, Kaliangkrik, Ngluwar and Salam). The processing of feed from crop waste and fertilizer from livestock waste technologies was the determinant of adoption level. It was divided into 3 categories, i.e. low, medium and high level. Results showed that 68.94% of respondents were in the low level, 21.97% was in the medium level and 9.09% was in the high level. There was a significant relationship between consulting to extension agents, number of training, farmers’ length of group membership, experience on raising livestock, and ruminants’ type raised by farmers toward adoption level on the technology of MCL farming.
Feeding reduced dietary protein added with prebiotics on protein metabolism characteristics and growth performance of broiler chickens
Authors: Suthama Nyoman , Sukamto Bambang , Mangisah Istna , Krismiyanto Lilik
Published: October 2020

The purpose of the present study was to evaluate the effect of feeding prebiotics on protein metabolism characteristics and growth performance of broilers. A completely randomized design with 4 treatments and 5 replications was arranged. Heterophil/lymphocyte (H/L) ratio, protein metabolism characteristics (protein digestibility, fecal Nt-MH excretion, and meat protein mass), and growth performances (feed consumption, BWG, and FCR) were the parameters observed. Analysis of variance was performed to statistically evaluate the data, and continued to Duncan test at 5% probability. Protein digestibility, and meat protein mass in T1 and T2 were significantly (P<0.05), while those in T0 were significantly (P<0.05). On the contrary, H/L ratio, feed consumpton, and FCR were significantly (P<0.05) lowest in both T1 and T2, but those in T0 were significantly (P<0.05). In conclusion, feeding inulin and soy-oligosaccharide extracts improves protein metabolism and it is characterized by the increase in protein digestibility and meat protein mass, and promote better growth of broiler.
Stakeholder Collaboration in The Development of Tourism Villages (Studies on Kandri Tourism Village, Gunungpati Subdistrict, Semarang City)
Authors: Susilowati Indah , Ibnu Tsani Luthfi , Edy Yusuf AG , Sasana Hadi
Published: October 2020

The aim of this research was to formulate a mechanism of relations between stakeholders in the management of the tourist village of Kandri. The analytical method used in this study was the Mixed Method by combining quantitative approaches and qualitative approaches to analyze data. Data collection was done by key informant interviews, field observations and literature studies. The technique for determining key informants was snowball method. In-depth interviews were used using Mactor to find out the mechanism of relations between stakeholders. The identification results show that there were 7 stakeholders involved in the development of Kandri tourism village. The Semarang City Office of Culture and Tourism was an actor center in relationships that occur between stakeholders in the development of tourism villages. The mechanism of relations between stakeholders was based on Auth and the institutional rules that are owned include relations of coordination, communication, and cooperation. Formulation of the relationship mechanism can be done by making a joint work program. The making of the program was driven by the Semarang City Office of Culture and Tourism based on the results of stakeholder needs analysis. The work program will be adjusted to the autonomy and institutional rules.
Supply Chain Analysis of Chayote in Semarang Regency, Central Java Province, Indonesia
Authors: Roessali Wiludjeng , Dwi Purbayanti Endang , Dalmiyatun Tutik , Nurfadillah Suryani
Published: October 2020

This study aim was to analyze the supply chain performance of chayote vegetable in Semarang, Central Java Province, Indonesia. The survey was conducted from April to July 2019. The analytical method used was descriptive quantitative, namely research by describing the conditions in the field from several individuals interviewed directly. Respondents were determined purposively on farmer respondents and snowball sampling for marketing institutions. The results showed that the supply chain of chayote vegetables at the research location had clear market targets however there were problems in optimizing supply chain targets, namely information on prices at the farm level, knowledge of good quality. The measurement of supply chain performance was categorized quite efficiently based on the marketing efficiency approach by calculating the income margin and the farmer’s share.
Determining strategy of beef cattle development in Karanganyar Regency, Central Java, Indonesia
Authors: Hadi Purnomo Sutrisno , Intan Sari Ayu , Emawati Shanti , Tri Rahayu Endang
Published: October 2020

The purpose of this study was to determine the profile of beef cattle entrepreneur group members, to analyse the main factors that influence the development of beef cattle business, and to determine the strategies that can be applied for the development of beef cattle business in Ngargoyoso District, Karanganyar Regency. The basic method in this research was survey research method. Determination of the location of the study was conducted by purposive sampling. The research sample was determined by convenience sampling consist of 60 farmers. Data collection techniques were carried out by means of interviews, observation and questionnaires. The data analysis method used the IFE matrix, EFE matrix and SWOT analysis. The profile of beef cattle business in Karanganyar regency was still traditional in the management system, providing reef resources and managing in the financial sector. The results of the quantitative SWOT matrix analysis show that the appropriate strategy in the development of beef cattle farms was in quadrant 2. The strategy must be implemented in quadrant 2 was to take advantage of long-term opportunities by means of diversification or innovation that can be done by applying technology in the form of feed processing technology, reproduction technology, and waste treatment technology.
The Effect of Gamma Co 60 Radiation on Soybean (Glycine max(L.) Merr) Shade Tolerants
Authors: Harsanti Lilik , Anisyah  , Parno  , Tarmizi
Published: October 2020

Soybean is one of important national commodities for food and industry. Gamma rays are electromagnetic waves that have very strong penetrating power. One of the sources of gamma rays is from 60Co. With its strong penetration power, gamma rays can be used in plant breeding to create new genetic diversity in order to develop high-yielding varieties. Irradiation of gamma rays at 300 Gy dose on Denna 2 variety soybean was conducted, then it was planted as M1 plant and later continued to be planted as M2. In M2 generation, mutant lines was selected based on early maturity, better than of the parent variety.The criteria used was harvest age between 75-81 days, the plants should look robust and strong stems. Harvesting days of parent varieties (Denna 2) was 81 days, while the mutant strains obtained were between 75-81 days. Likewise, for the plant height, the parent variety was 42.30 cm, whereas mutant lines of 38,56 cm in average, making it more resistant to logging. The average pods for parent was 36.37 pods and mutant lines of 55.24 pods. In selected shade tolerant soybean of the M3 generation early aged mutan lines shade tolerant days, of the parent variety Denna 2 days.
In Vitro Ruminal VFA Concentrations from Rice Straw and Sugarcane Bagase Based Diets with Different NFC Sources
Authors: Achmadi Joelal , Pangestu Eko , Surahmanto  , Subrata Agung , Ainsyar Harahap M.
Published: October 2020

Information concerning with ruminal nutrient availability of feed could help in balancing ruminant ration. Rice straw and sugarcane bagase are known as fiber sources, and molasses is known as non fiber carbohydrate (NFC) source for ruminant. The banana plant root meal (BPRM) is postulated to replace the portion of molasses in a ruminant diet because of its NFC content. This study determined the in vitro ruminal concentrations of volatile fatty acids (VFA) from ammoniated rice straw and sugarcane based diets supplemented with molasses and BPRM, respectively, as NFC sources. In the experiment, two diets of rice straw based diets suppelemented with molasses (RSM) and BPRM (RSB) respectively, and two diets of ammoniated sugarcane bagase based diets supplemented with molasses (SGM) and BPRM (SGB) were tested their in vitro ruminal VFA concentrations using a technique of batch culture. Result of the in vitro test showed that there was no significant different in ruminal concentrations of total VFA, acetic, propionic, butyric, isobutyric, isovaleric, and n-valeric among experimental diets. The portions of molasses and BPRM could be replaced each other in the diet, and likewise for rice straw and sugarcane bagase. This is valuable indicative in attempt for sustaining ruminant feed availability.
The Potential of New High-Yielding Varieties Development in Tegal Regency
Authors: Sahru Romdon Anggi , Komalawati  , Harwanto
Published: October 2020

Tegal is one of the districts that has the opportunity to become one of the centers for rice production in Central Java Province. This is indicated by the relatively high paddy field area, ranked 9th in Central Java. However, rice production in Tegal Regency was only ranked 15th. One effort to improve IP is through the use of new high yielding varieties (VUB). This paper examined the opportunities for developing VUB rice in Tegal Regency. Primary data obtained from interviews with farmers and field staffs. Analysis of potential development was assessed from the feasibility of 32 and 43 VUB Inpari rice farming, Mekongga variety. The results of the study show that VUB rice farming was more feasible to be cultivated compared to the existing varieties. This was indicated by the R/C of both VUB rice which were higher than the existing variety. The response of farmers to both VUB rice was indicated by demand of most sub-districts in Tegal Regency to the two varieties. Therefore, it was necessary to guarantee the availability of VUB rice seeds in the market. This can be done by developing seed breeders of these varieties through Desa Mandiri Benih or a private seed company.
Partial Characterization of Watermelon Albedo Pectin Extracted Using Citric Acid Combined with Microwave Assisted Extraction
Authors: Ishartani Dwi , Mustika Sari Ardhea , Arifani Rizka , Kawiji
Published: October 2020

The aim of this study was to determine the influence of microwave power and extraction time on pectin chemical characteristics of watermelon albedo using citric acid combined with Microwave Assisted Extraction (MAE) method. Microwave power variations being applied were 50% (225 W), 75% (315 W), and 100% (450 W) and the extraction times were 1 minute, 2 minutes and 3 minutes. The data obtained was statistically analysed using two-way Analysis of Variance at a significance level of 5% continued by Duncan Multiple Range Test if there was a significant difference. The results showed that the variation of power and extraction time significantly affect yield, equivalent weight, degree of methylation, galacturonic acid content, and degree of esterification. Pectin yield was ranging from 2.19% to 5.34% and equivalent weight of the pectin ranging from 441.09 mg to 1432.00 mg. Pectin from the watermelon albedo was classified as low methoxyl pectin with degree of methylation ranged from 4.82%–6.92%. Galacturonic acid content of the pectin obtained was ranging from 39.83% to 79.21%. The pectin had a degree of esterification ranging from 49.57% to 68.74% which was classified as high ester pectin.
Consumer Satisfaction on Wetland Rice Agro-Tourism in Daerah Istimewa Yogyakarta (DIY)
Authors: Mulya Handayani Sugiharti , Jamhari  , Rahayu Waluyati Lestari , Handoyo Mulyo Jangkung
Published: October 2020

In Daerah Istimewa Yogyakarta (DIY), wetland rice agro-tourism grows rapidly and is in demand as the medium of education about agriculture. The attractions include planting rice and ploughing fields. This study aim was to determine the consumer satisfaction level of wetland rice agro-tourism. This research was conducted at Pentingsari Tourist Village, Yogyakarta, because it offers wetland rice agro-tourism. The respondents were 70 people, it was determined by accidental sampling. The CSI (Customer Satisfaction Index) and IPA (Importance Performance Analysis) were used to determine consumer satisfaction. The attributes were derived from the servqual dimensions (tangibles, reliability, responsiveness, assurance and empathy). The results have revealed high satisfaction level of consumers from DIY and outside DIY, however, there are several aspects that need improvement. Consumers had different evaluation over the attributes of services. To rise the satisfaction of consumers from DIY, wetland rice attraction must be packaged more attractively by improving the tour guides in term of communication skills. To improve the satisfaction of visitors from outside DIY, homestay facilities need to be enhanced without leaving the uniqueness of countryside and the guarantee of safety.
pH Value, Total Microbes, Alcohol Content and Overall Hedonic Characteristic of Ginger Ale
Authors: Dwiloka Bambang , Budi Pramono Yoyok , Zaliani Anqi , Etza Setiani Bhakti , Dwi Puspitoasih Anggun
Published: October 2020

Ginger Ale is a type of beverage that is quite well-known in the United States and Europe as a form of beverage that is affiliated with the basic ingredients of rhizomes (roots). This research aims at to analyse the pH value, total microbes, total sugar and overall hedonic properties of ginger ale with palm sugar substitution to white sugar namely T0 = 0%, T1 = 25%, T2 = 50%, T3 = 75%, T4 = 100%. Each treatment was done in 4 replications. The parameters tested were alcohol content, pH, total Saccharomyces and hedonic yeast. The data obtained were analyzed using ANOVA at a significance level of 5% and if there was a difference it was then analyzed by the Duncan Multiple Range Test. Hedonic test result was analyzed using Kruskal-Wallis test with a significance level of 5% and if there were differences then continue to be analyzed using Mann Whitney test. Based on the research, it can be concluded that the substitution of white sugar with palm sugar in ginger ale had significant influence on the level of alcohol content and pH value while had no significant effect on total microbes. Regarding hedonic quality, ginger ale with 75% palm sugar substitution showed as the most preferred formula for ginger ale.
Induced mutation by gamma rays on performance of MV3
Callistephus chinensis at lowland
Authors: Anwar Syaiful , Karno Karno , Kusmiyati Florentina , Herwibawa Bagus
Published: October 2020

Callistephus chinensis has beautiful flower with high sale price and usually grow at highland/plateau. An experiment was carried out to evaluate the effect of induced mutation by gamma rays on performance of third generation (M1V3) Callistephus chinensis at lowland. Tiller of Callistephus chinensis was induced mutation by gamma rays at 0 Gy (Yo), 5 Gy (Y1), 10 Gy (Y2), 15 Gy (Y3) and 20 Gy (Y4) at first generation (M1V1). Plant from M1V2 was selected based on earlier flowering as plant material for M1V3. There were 12 genotypes selected. Twelve genotype and Y0 were planted at lowland (125 m above sea level) in Tembalang - Semarang. The results showed that induced mutation by gamma rays increased height, number of leaves, number of flower, flower stalk length of M1V3
Callistephus chinensis at lowland. Number of tiller were not significantly different between induced mutation plant and control, except for Y1-U4-11 and Y3-U3-10. Colour of flower was not significantly different between induced mutation plant and control, except for some of Y3-U3-10 genotype. Most flower colour was purple, while some of Y1-U4-9 genotype (Y1-U4-9-5) were pink. The conclusion was Callistephus chinensis can adapted in lowland due to induced mutation by gamma rays.
Various Driver Factors For Youth Farmers in Malang Related with Horticultural Business
Authors: Yusnita Arvianti Eri , Masyhuri  , Rahayu Waluyati Lestari , Hadi Darwanto Dwijono
Published: October 2020

Horticultural business in Malang tends to be cultivated by young farmers with various characteristics, such as individual characteristics, economic environment, social culture, empowerment, and managerial capacity. The purpose of this study was to determine the effect of individual characteristics and external environment on the interests of young farmers and horticultural farming in Malang Regency. The study was conducted using a purposive sampling method with a number of 200 young farmers. Data collection was carried out for 3 months, from January to March 2019. Data analysis was used using SEM WarpPLS. Based on the results of the analysis and discussion that the interest of young farmers in horticultural agriculture in Malang Regency is still high, the statistical test found that the external environment in the form of social and empowerment factors encourages the interest of young farmers in horticultural agriculture in Malang Regency. In addition, the knowledge of young farmers is the main driving factor that drives the interests of young farmers. Other factors such as individual characteristics, economic environment, and managerial capacity are not significant drivers, because the statistical value is below its critical value.
Perception of cattle farmers toward silage as animal feed
Authors: Sri Lestari Veronica , Prawira Rahardja Djoni , Mohammad Saleh Ikrar
Published: October 2020

Silage is a high-yield fermented feed given to ruminants. The aim of this research was to identify perception of cattle farmers toward silage as animal feed. The research took place in Soppeng Regency, South Sulawesi. Data were collected through observation and interview by using questionnaires. Likert scale was used to answer the questions which consisted of score 3 refer to agree, score 2 refer to less agree and score 1 refer to disagree. Data were analysed descriptively by using mean and percentage. The results of this research showed that perception of cattle farmers toward silage as animal feed was categorized as agree.
Total Bacteria and The Gram-Positive and Negative Bacteria of Small Intestines Broilers in Starter Period With Different Methods of Giving Probiotics
Authors: Sumarsih Sri , Sulistiyanto Bambang , Utama C. S.
Published: October 2020

The objective of the study was to evaluated total bacteria and the existence of positive and negative gram bacteria of small intestines broilers in starter period with different methods of giving probiotics Lactobacillus Sp. The completely randomized design with 4 treaments and 5 replications was used in the research. The treatments were T0 = Control without probiotics, T1 = Force feeding method, T2 = Giving Lactobacillus Sp. On Feed, T3 = Giving Lactobacillus Sp. on drinking Water. Data of bacteria population were evaluated by descriptive analysis. The Result showed that the total bacteria of small intestines broilers in starter period with given probiotics Lactobacillus Sp. (T1, T2 dan T3) were lower compared to control treatment. Most of the microbes of small intestines broilers in starter period with given probiotics Lactobacillus Sp. (T1, T2 dan T3) were Gram-positive rods, followed by Gram-positive cocci and Gram-positive duplococci, the gram-negative rods bacteria were founded at small intestines broilers in starter period with control treatments. The conclusion was the total bacteria at small intestines broilers in starter period with given probiotics Lactobacillus Sp. was decreased and there were positive gram bacteria, and suppress negative bacteria.
Asymmetric Price Transmission in the Indonesian Food Market
Authors: Laili Fitrotul , Widyawati Wiwit , Budi Setyowati Putri
Published: October 2020

A large number of goods and companies operating on different markets and selling varied agricultural and food products are present in the food supply chains. As well, the food supply chain associates producer and consumer through price mechanism. One question of specific is whether price rises and declines in the food supply chain at one stage have asymmetrical impacts. Thus, this study was designed to examine asymmetric price transmission in Indonesian food market between the producer and consumer using Engle-Granger two step approach. The study confirmed that producer prices were co-integrated with consumer prices in the food market. As a consequence, an asymmetric error correction model (AECM) was used to test for asymmetric price transmission between price levels in Indonesian food market. The outcome shows a higher response to producer rises than declines in both long-and-short term customer pricing. Hence, the findings show that the prices in the Indonesian food supply chain are favourable asymmetrical. Finally, the results of the present study indicate that the food prices pass-through varies greatly across product category and across country, and the pass-through to producer prices is greater than that in consumer prices. Therefore, understanding the asymmetric transmission is critical to help design better domestic price stabilization policies, and minimize jeopardize the price shocks for both of consumer and producer.
The Effect of Natural Additives On Microbiota and Body Weight On Broiler Chicken
Authors: Mangisah Istna , Suthama Nyoman , Rizqiati Heni
Published: October 2020

This study was conducted to evaluate the effects of natural additives (synbiotics) made from Lactobacillus casei and dahlia tuber extracts (LDT) and synbiotics made from Lactobacillus casei and garlic tuber extract (LGT) on the number of lactic acid bacteria and coliform in the small intestine and body weight of broiler chicken. One hundred and sixty 1-day-old broilers were randomly placed in 20 experimental units for 3 weeks. The study used a completely randomized design with 5 treatments and 4 replications, each experimental unit consisted of 8 birds. The treatments tested were level of additives, T0 (control), T1 = LDT 1%, T2 = LDT 2%, T3 = LGT 1% and T4 = LGT 2%. The parameters observed were the amount of lactic acid bacteria (LAB) and coliform in the small intestine and the body weight of the starter phase of broiler chickens. The collected data were analyzed for variance and if there was a significant effect, then continued by Duncan multiple region test. The results showed that used of LDT1% and LDT 2% no significantly affected on lactic acid bacteria, coliform and body weight of broiler chickens. Giving LGT 1% and LGT 2% significantly increased the amount of LAB in the small intestine and increased body weight, while the number of coliform was significantly lower than the control. The conclusion was that the natural additives LGT 1% and 2% could increase LAB, reduce colliform and improve the performance of broiler chickens.
Feed efficiency and income over feed cost of Ettawa crossbred goats fed different quality of dry complete feed supplemented with mineral
Authors: Muktiani A , Kusumanti E. , Harjanti D.W. , Achmadi J.
Published: October 2020

This study aim was to evaluate the effect of different quality of dry complete feed and mineral (Zn-Se) supplementation on feed efficiency and income over feed cost of Ettawa crossbred goats. Sixteen weaned female goats aged 4-month-old were used in this study. The experiment was conducted in factorial 2x2 in a completely randomized design with 4 replications and 2 factors. The first factor was different levels of energy and protein in the diets: 14% CP + 63% TDN (T1); and 16% CP + 67% TDN (T2). The second factor was the Zn-Se supplementation (treatment and control). The concentration of Zn and Se in the supplement were 20 mg/kg and 0.2 mg/kg, respectively. Results showed that goats in T1 group lost the body weight (BW) by 11.07 g, whereas T2 group gained 10.48 g of BW within 6 weeks of experimental period. Supplementation of Zn-Se in the T2 diets prevented the BW lost and resulted in the highest BW gain (7.15 kg) within 14 weeks. Moreover, the T2 diets plus Zn-Se supplement also resulted in the highest feed efficiency (11.82%) as well as income over feed cost (IDR. 1,722 head/d). It is concluded that dry complete feed containing 16%CP and 67% TDN with Zn-Se supplementation (Zn 20 mg/kg + Se 0.2 mg/kg). It is recommended for female weaned-goat for the optimal growth and increase the income over feed cost. It is recommended for female kid goat at the growth phase.
Haematological indices and carcass yield of Kampong chickens administrated with turmeric (Curcuma domestica)
Authors: Widiastuti Endang , Isroli Isroli , Yudiarti Turini , Sugiharto Sugiharto , Agus Sartono Tri , Indrat Wahyuni Hanny , Murwani Retno
Published: October 2020

The study aim was to investigate the effect of turmeric (Curcuma domestica) administration on the blood profile, serum biochemical parameters and carcass yield of the Kampong chickens. A total of 200 day-old Kampong chickens were used in the study according to a completely randomized design with five treatments and five replications (containing eight chickens in each). The chicks were provided with the basal ration containing of 22% crude protein. The treatment groups included T0 (chicks provided with basal ration, without turmeric), T1 (chicks provided with turmeric filtrate in drinking water 1:3), T2 (chicks provided with turmeric powder 0.5% in ration), T3 (chicks provided with fermented turmeric residue 0.5% in ration) and T4 (chicks provided with turmeric residue 0.5% in ration). The results showed that turmeric administration increased (P<0.05) the serum total protein concentration and carcass weight of the Kampong chickens at day 32. However, the treatment did not affect the growth performance and feed efficiency of the Kampong chickens measured at days 32 and 45. It could be concluded that the administration of turmeric both through diet and drinking water had minor impact on the haematological indices but increased carcass yield of the Kampong chickens especially during the starter period.
A Fuel Testing Analysis of B20 Biodiesel for Gas Turbines in Indonesia
Authors: Reinmart Benny , Arifin Zainal
Published: October 2020

Biodiesel fuel has been applied to diesel cars for more than ten years and used on power application (turbines, boilers, etc.) recently in whole or blended with fossil fuels. The advantage of using biofuels as a renewable source is the significant reduction of greenhouse gas emissions. This study investigates the possibility of using biodiesel for gas turbine power plant in Indonesia through fuel testing analysis. Some biodiesel produced from four separated factories has been selected as samples for analyzing and then comparing to the fuel specification of three different gas turbine technologies located in Tello, Belawan and Gresik. It is found that no B20 biodiesel meet the requirements of fuel specification from all gas turbine technologies. This study recommends standardizing B20 biodiesel in Indonesia in order to be suitable with the fuel specification of gas turbines. In addition, some technical issues has been proposed to be further research. It is also recommended to do a pilot project using appropriate biodiesel at some gas turbines technologies on operation mode within life cycle cost analysis.
Technical, economic and environmental analysis of residential scale of the rooftop PV system in Surabaya, Indonesia
Authors: Tarigan Elieser
Published: October 2020

This work studies the technical, economic, and environmental of a 3 kWp rooftop photovoltaic (PV) system for residential in Surabaya, Indonesia. The studies were conducted based on the data from a built instalation of rooftop on-grid PV system. In addition, analysis were carried out using SolarGIS PV planner, RETSCreen, and PVsyst simulation tools. The results show that a 3 kWp rooftop system in Surabaya could produce electricity of about 3,898 kWh per year. Under present conditions, economic analysis shows that the rooftop PV system investment would give the payback period of about 5 years. Environmentally, the 3 kWp PV system would result of the reduction of greenhouse gas (GHG) emission of about 3.8 tons of CO2 per year.
Research on Multi-Scenario Distributed Wind and Photovoltaic Power Accommodation Capacity of Distribution Network Based on Time Series Production Simulation
Authors: Wu Jun , Ma Shiyi , Duan Cong
Published: October 2020

With the large-scale access of distributed new energy into the distribution network, the evaluation on the accommodation capacity of distributed new energy in the distribution network has important guiding significance for the scientific planning of distributed generation and grid connection. Considering the parked and regionalized development trend of distributed power generation mode, this paper proposes a method for evaluating the distributed wind and photovoltaic power accommodation capacity of regional distribution networks based on time series production simulation from the perspective of practical applications. Based on the timing difference and complementarity of the load characteristics of substations on the distribution network side, we conducted an evaluation on the distributed wind and photovoltaic power accommodation capacity of the regional distribution network, and through taking the flexible operation mode of the distribution network side into consideration, realized the mutual assistance from time domain and space dimension of distributed new energy consumption and carrying capacity of various substations. Through establishing a mathematical model for the consumption and carrying capacity analysis in the multi-scenario modes such as local node consumption, local station consumption and allowing certain percentage of abandoned electricity, we came out the scale of the maximum consumption of distributed new energy in different scenarios as well as the overall grid connection layout scheme. In the end, we used such evaluation method to conduct an empirical analysis on the distribution network in certain region, verified the correctness and effectiveness of the model, and provided theoretical supports for guiding the regional distributed new energy overall planning and scientific grid connection.
Forecasting Indonesia’s electricity generation: an application of long-range energy alternatives planning
Authors: Qolbi A , Utomo A
Published: October 2020

The primary focus of this paper is to provide an energy forecast for electricity generation in Indonesia. The modelling method with Long-range Energy Alternatives Planning System (LEAP) software is implemented with the interpolation with growth, linear forecast, exponential forecast, and logistic forecast upon two projection scenarios of business as usual (BAU) and with current government policy (CGP). Input data used are including the past data of electricity generation from 2005 to 2017, the target electricity generation from 2019 to 2028 and its share based on Indonesia’s policies and planning on electricity generation, and other electricity generation highlights based on the defining policy. The result analysis for the BAU data projects the total energy generation of 1,306.17 Terawatt-hour (TWh), comprising of 47.7% coal, 43.4% gas, 3.51% hydro, 2.32% oil, and 1.85% geothermal with the remaining percentage from other renewable energy resources. On the second scenarios with current government policy, the model predicts electricity generation to be 1,404 TWh, consisting of 54.4% coal, 22% gas, 10.93% hydro, 0.4% oil, 9.63% geothermal and the rest percentage from other renewable energy resources. The gap in the two results in the renewable energy mix shows the actual challenge that will require the government to take significant action to realize the plan.
An intelligent power flow adjustment method based on reinforcement learning
Authors: Ye L , Xiang Z M , Yang Y , Zhu Y L , Zhang C , Yao H F
Published: October 2020

In order to examine the future power grid operation, the operators usually build future power system model files first according to boundary conditions such as infrastructure plans, maintenance plans, power generation plans, load forecasts, and power plan requirements. As these plans are usually prepared independently, and the scale of the power grid is getting larger and larger, the newly built grid model is usually unsolved, ill, or does not meet the actual grid operation requirements. In this situation, the operators normally have to readjust the units power many times, according to their own experience, to obtain a qualified power flow result. A method for power flow adjustments is proposed in this paper. The Q-Learning (QL) method is used to adjust the power flow from nonconvergence to convergence, and then some direction guidance for subsequent adjustments is provided through certain safety and economic indicators of the power grid (such as network loss, output of the balancing machine, etc.). Finally, two examples of IEEE39 nodes system and Zhejiang power grid are presented to verify the effectiveness and practicability of the proposed method.
Research on sequence automatic execution technology of substation safety measures
Authors: Tan Chang , Chen Haibin , Zhang Binbin , Yang Haiyun , Geng Shaobo , Mao Jianzhong
Published: October 2020

With the increasing complexity of the power grid, in order to ensure the reliability and stability of the power supply system, higher requirements are imposed on the automation level of the power system. Substation security measures are generally performed manually, and maintenance personnel need to cast and withdraw pressure plates one by one based on the automatically generated secondary security measures, and manually verify the results of each step. This paper proposes a technology for the automatic execution of security measures in substations. Based on the generated security measures, it implements automatic sequence control operations and has proofreading functions. This method improves the level of substation automation while ensuring the correct execution results of safety measures, and provides an important guarantee for the safe and stable operation of the power system.
Calculation of electromagnetic field for very fast transient process in GIS
Authors: Zhuangzhuang Yang
Published: October 2020

The calculation method of electromagnetic field generated by very fast transient process in GIS is studied. The VFTC is calculated, and the mathematical model of direct wire electromagnetic radiation is established according to the structure of GIS. The space electromagnetic field is calculated with VFTC as excitation source. The non-stationary VFTC simulation waveform is decomposed in combination with Hilbert yellow method. The electromagnetic field intensity of each decomposed waveform is calculated on the basis of mathematical model of direct wire electromagnetic radiation. Then the electromagnetic field intensity of fast transient process is reconstructed. The results show that the intensity of electromagnetic field decreases exponentially with the increase of distance. The method proposed solves the theoretical calculation of complex electromagnetic field for unsteady VFTC waveform that contains complex frequency components with transient characteristics in very fast transient process. That has theoretical guiding significance for the electromagnetic field calculation of very fast transient phenomenon in GIS.
Research on Internal Resource Quality Evaluation and Cascade Utilization Strategy of virtual power plants
Authors: Liu Dunnan , Wu Wenzhuo , Li Pengfei , Tao Li , Zhang Lin , Han Jianshan
Published: October 2020

With the continuous promotion of power market reform, the trading mode of power market is constantly enriched. In this context, the virtual power plant technology breaks the traditional “source grid load storage” boundary, and realizes the multi-energy complementary and multi-source interaction of the power system, but the resource utilization strategy for the virtual power plant is not enough. Therefore, starting from the composition of virtual power plant, this paper constructs the internal resource quality evaluation system of virtual power plant. Based on the division of resource quality, the cascade utilization strategy of virtual power plant resources is provided. The practical results show that the quality evaluation of internal resources of virtual power plant is helpful to classify the internal resources of virtual power plant, help them realize the cascade utilization of resources, and maximize the economic benefits of virtual power plants.
The Data-based Analysis of Intersection Delay Research
Authors: Wang Ti-ying , Zhu Chun-xia , Jin Zhi-yang
Published: October 2020

To analyse the intersection delay, the crossing of Haikou Renmin Avenue and Haidian Five Road is selected as the target of the research. After the field measurements regarding the average delay times at the target intersection, the methodology of data-based analysis is adopted in this article with a full-scale research. What’s more, to enhance the similar intersections’ service level, this article carefully considers relevant delay factors with attempts to explore multi-factorial measures so as to mitigate the concerned delay. Additionally, with the introduction of modern traffic engineering and traffic management, practical methods are proposed to achieve the effective alleviation of intersection delay times as well as improving its operation quality.
Integrated Energy System Planning Based on Equipment Performance
Authors: Yang Yang , Wei Mengju , Liu Zhao , Wang Yongli , Cai Chengcong , Zhou Minhan , Song Fuhao
Published: October 2020

The Integrated Energy System (IES) has the advantage of improving energy utilization and promoting energy flexibility. Its equipment configuration is one of the keys to Integrated Energy System planning. This paper takes equipment selection and capacity planning as the goal establishes the IES equipment selection and capacity planning model makes the minimum annual inclusive cost as the optimization goal and uses the mixed-integer linear programming algorithm to solve the practical problem. Finally, a typical southern park is taken as an example to analyze and verify the feasibility of the model and algorithm.
Application Research of Full Process Engineering Consulting in Power Grid Engineering Cost Management
Authors: Xiaoyu Xu
Published: October 2020

The safe and reliable supply of electric energy is an important foundation for ensuring the rapid development of my country’s social economy. In recent years, with the continuous increase in the power demand of the whole society in our country, the scale of investment and construction of power grid projects has continued to expand, strengthening project cost management and improving project investment efficiency has become one of the important goals of investment management of power grid enterprises. The whole process engineering consulting service covers the complete life cycle of the power grid project, from the feasibility study analysis report and feasibility estimation preparation, project preliminary design and preliminary budget preparation, to project decision-making plan, project bidding plan, project whole-process cost management. Completion settlement and final accounts have made important contributions to the investment and construction of power transmission and transformation projects in China.
Design and simulation of three-level SVPWM based on FPGA
Authors: Qu Limin , Wang Chao , Sun Wei , Lin Yang , Zhang Hang
Published: October 2020

After expounding the overall design of the three-level SVPWM principle and algorithm, the SVPWM top level module using FPGA is created. And A/D conversion module, the Clarke transformation module, the adjacent vector function time module and the triangle carrier module are also established. Quartus II is used to simulation. And compared with the simulation results of MATLAB, the simulation waveforms are consistent, which verifies the correctness of the simulation results. Taking the diode clamped three-level inverter as the research object, the simulation waveforms of the different modulation M are compared, and the correctness of the three-level SVPWM control strategy is further verified.
Case Analysis of GIS Partial Discharge Based on Cooperative Detection Method
Authors: Yanpeng Gong , Fei Du , Jiangang Bi , Yuan Xu , Wenzhi Chang , Shaoan Wang , Xiaoxin Chen
Published: October 2020

Partial discharge diagnosis methods, such as ultrasonic method, ultra high frequency method and decomposition product method, have their respective advantages and disadvantages in the application. Therefore, in order to combine the characteristics of various detection methods, it is recommended to carry out joint detection of various methods in the field. In the end, a case of GIS PD is introduced.
Model of Battery Capacity Attenuation at Low Temperature
Authors: Wang Hongwei , Liu Jun , Zhao Weizhe , Zhu Yusong , Hu Bin , Fu Yanling , Tao Ziqiang
Published: October 2020

Lithium-ion batteries are widely applied for its advantages of being high in energy density, low in self-discharge rate, and high in maximal cycles, having no memory effect, and being pollutant-free. Accurately predicting the service lives of lithium-ion batteries is the important basis for reasonably working out battery replacement policy and ensuring safe use. For the purpose of this article, an acceleration model is devised for the valid period of capacity and the effect of temperature on lithium-ion batteries, revealing the pattern in the effects of capacity-related factors, and providing the fundemental data for the use of batteries at low temperatures.
Application of UAV Photogrammetry Technology in Airport Project
Authors: Ji Peng , Cheng Lan , Jia Yong , Du Wenjia
Published: October 2020

At present, UAV photogrammetry technology is gradually applied in the field of Airport project survey, which improves the efficiency and accuracy of measurement, and ensures the overall effect of airport construction. The traditional manual measurement method is inefficient and easy to be interfered by other factors, so it is difficult to meet the needs of large-scale, high-efficiency and high-precision measurement of airport construction. UAV photogrammetry improves the efficiency and accuracy of measurement, which can provide important reference for airport construction.
Influencing factors and treatment measures of wet sliding in tunnel
Authors: Zeng Youquan
Published: October 2020

In order to study the main influencing factors of wet sliding in the tunnel, a regional meteorological observation network was established based on Baojiashan tunnel. Based on the detailed monitoring data for two consecutive years, the influence of air relative humidity, air temperature, temperature difference inside and outside the tunnel, rainfall, wind speed, air pressure in the tunnel and other influencing factors on the tunnel wet sliding phenomenon were analyzed. The results show that the wet-slip phenomenon in the tunnel has no obvious relationship with the rainfall and air pressure changes. It is mainly related to the meteorological conditions of high temperature and humidity outside the tunnel and the wind speed of tunnel ventilation. Based on the analysis of the physical mechanism of tunnel wet sliding phenomenon, a warning table for tunnel wet slip phenomenon was developed in order to promptly warn the tunnel wet slip phenomenon and take countermeasures.
Applicability analysis of two kinds of clean heating products in rural area
Authors: Yulei Zhao , Yajing Wang , Chunhua Liu , Xingyu Liu , Chuanliang Xu
Published: October 2020

This article compares the advantages and disadvantages of three decentralized clean energy heating products such as gas wall-hung boilers, air source heat pumps, and biomass heating. Through a rural case in Dezhou, it is recommended that the appropriate clean energy heating schemes should be determined based on local resource characteristics.
Calculation method of PFC assessment index of thermal unit based on time point comprehensive treatment
Authors: Li Jun , Wang Ming , Qiu YuQiang , Sun YuJie
Published: October 2020

With the rapid development of clean new energy, power fluctuations bring great challenges to power grid frequency control. The main ways of dealing with the instantaneous power gap depends on primary frequency control(PFC) of thermal units. Based on the analysis of the problems and shortcomings of the current two assessment methods of PFC, one method for calculating the assessment index of PFC of thermal unit based on time point comprehensive treatment is proposed. The efficiency and accuracy of the examination index of PFC are improved by calculating the multi-point speed governing droop based on the national standard, so as to ensure that the unit can meet the demands of the power grid for the speediness and stability of the PFC action, and ensure the safety and stability operation of power grid.