bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of Protein Content and Amino Acid Profile in Fish Feed Made From Maggot Meal and Earthworm Meal
Authors: Kusnadi  , Prabandari Sari , Nurcahyo Heru , Syarifudin  , Suyono  
Published: March 2023

Abstract
Amino acids were the main components of protein with great potential in feed for fish growth and survival. Some fish feed ingredients sourced from animal protein that can reduce the use of fish meal are maggot and earthworms. The purpose of this study was to determine the protein content and amino acid profile through the use of maggot meal and earthworm meal in fish feed. The use of maggot meal was substituted from 5% to 20%, while earthworm meal was substituted by 4%. Fish feed formulation with ratio of fish meal (FM), maggot meal (MM) and earthworm meal (EM) was tested based on several ratios, namely F1 (30% FM and 5% MM, 4% EM); F2 (25% FM, 10% MM and 4% EM); F3 (20% FM, 15% MM and 4% EM); F4 (15% FM, 20% MM and 4% EM). The results showed that the protein content produced ranged from 23.65% to 26.66%. Glutamic acid had the greatest amino acid profile across all formulations, followed by aspartic acid, arginine, and lysine. Protein content and amino acid profile in the treatment formulas F3 (15% MM and 4% EM) and F4 (20% MM and 4% EM) always occupy the highest position, while the combination ratio of F1 (5% MM and 4% EM); F2 (10% MM and 4% EM) were generally always in the lower position. This shows that the results of the amino acid profile content of the second combination of this type of natural animal source have increased in line with the increase in the addition of maggot meal.
Dynamic Model of Segara Anakan Mangrove Crab’s Habitat Management, Indonesia
Authors: Ismail Ismail , Sulistiono Sulistiono , Hariyadi Sigid , Suruaki A , Katili V 
Published: March 2023

Abstract
The mangrove area in Segara Anakan lagoon (Cilacap, Central Java) is a good habitat for mangrove crabs and other mangrove biota life and growth. However, in recent years, the condition of the mangroves in the area has been degraded due to land conversion. This condition also occurs in the production of mangrove crabs in the Cilacap Regency which has decreased (2012-2017 production data). Good management efforts of the mangrove forests will also have a good impact on the growth and production of these biota in nature. This study aims to create a dynamic model of mangrove crab habitat management at Segara Anakan Lagoon in order to increase the optimization of mangrove crab production in that regency. The study method used was a dynamic systems approach that considers the relationship between crab production and the conversion of mangrove land. The results of the study showed a model of the relationship between mangrove crab production and changes in mangrove area in the Segara Anakan area with the equation: Y = 14951X − 88357 (R2 = 0.5382), with structural validation as follows: land conversion increases (rice field area) (+) and then increase the income from rice fields (+). Meanwhile, land conversion reduces mangrove area (-), reduces crab habitat function (-), reduces crab catch (-), further reduces mud crab production, and finally reduces income from mud crab production (-). The validation of the model output is the average mean error (AME) of crabs at 4.93%, while the AME of mangroves is 7.38%. This model can be concluded as a valid (acceptable) model and can be continued to the simulation stage.
The Aquatic Environment of Bengawan Solo Estuary, Gresik, East Java As The Basis for Fisheries Development
Authors: Dewi N N , Mubarak A S , Triastuti J , Tjahjaningsih W , Asriansyah A , Aiswantari  , Wildan D M , Lukman  
Published: March 2023

Abstract
The waters of the Bengawan Solo River estuary have an important role in enriching the waters of north Gresik and its surroundings areas, and become one of the fishing grounds for coastal fish in that region. This study aims to reveal the aquatic environment condition at the area as the basis for fisheries development. The study was carried out bimonthly through water sampling and analysis both in situ and ex situ at 5-8 stations from January to July 2022. Observations were made on water physical parameters (temperature, transparency, and turbidity) and water chemical parameters (pH, salinity, dissolved oxygen-DO, nitrite, nitrate, ammonia and phosphate). Based on analysis on the physical and chemical parameters, it was known that the range (and standard deviation) of waters quality varied, i.e. temperature 28.20-29.80°C (28.91±0.32oC), transparency 5.00-70.00 cm (21.61±16.19 cm), turbidity 5.84-947.00 NTU (324.40±325.80 NTU), pH 5.00-7.30 (6.66±0.45), salinity 0.00-28.00 psu (4.69±8.34 psu), DO 3.65-7.80 mg/l (5.48±1.09 mg/l). The concentration of nitrite, nitrate, ammonia and phosphate were 0.000-0.100 mg/l (0.007±0.021 mg/l), 1.000-5.000 mg/l (2.483±1.430 mg/l), 0.100.-0.600 mg/l (0.193±0.112 mg/l) and 0.100-6.000 mg/l (0.366±0.114 mg/l), respectively. From the analysis of the aquatic environment condition, it can be seen that the waters of the Bengawan Solo estuary are quite good, and suitable for fisheries development. However, based on the pollution index value, it can be stated that the estuary waters of the Bengawan Solo River are in good category
Adaptation performance of immature broodstock Oryzias woworae post-transportation of closed system
Authors: Mulyatama R , Mustahal  , Syamsunarno MB , Herjayanto M 
Published: March 2023

Abstract

Oryzias woworae, one of the endemic ricefish species from Sulawesi, is threatened with extinction in their habitat. Domestication of aquaculture is one way to preserve the conservation of these fish. The success factor for cultivation is the adaptation of the immature broodstock in a controlled environment for gonadal maturation. Adaptation performance of immature broodstock after closed system transport is the first study of O. woworae at the start of an adjustment in a controlled rearing. This study aimed to examine the survival during transportation and adaptation performance of immature broodstock O. woworae post-transportation. O. woworae has been transported for 5 hours. The transport system used a closed system in 2 plastic bags (separated male and female) measuring 1 kg with a density of 35 fish/2 L. Fish were adapted in the aquarium for 20 days. The result showed that O. woworae could adapt well after being transported in a closed system after 20 days of rearing post-transportation. Survival of immature broodstock O. woworae during transport was 100% for females and 91.42% for males. Rearing post-transportation showed that survival rate was 94.28% for females and 100% for males, with swimming activity had been active since day 2, and good response for feed. After rearing, the average final weight and total length of O. woworae were 0.48 g and 2.2 cm for females and 0.47 g and 2 cm for males, respectively. The partially fertilized eggs during rearing indicated that O. woworae have been ready as broodstock.
Biodiversity and Community Structure of Zooplankton in The Domas Coastal waters of Banten Bay, West Java, Indonesia
Authors: Fitriya N , Thoha H , Sulistiono  , Asriansyah A , Wulandari D Y , Wildan D M , Rohim N , Srimariana E , Hestirianoto T , Rastina  , Subhan B. 
Published: March 2023

Abstract
Domas coastal waters, located east of Banten Bay, have an enormous potential for fisheries resources closely related to the presence of plankton in the area. This study was carried out for 6 months, from August 2021 to January 2022, to examine the biodiversity and community structure of zooplankton in the Domas coastal waters. Sampling was carried out monthly at six stations distributed from coastal areas to the sea. Data on the zooplankton were examined for abundance, diversity, evenness, and dominance indices. Based on the observations, zooplankton in these waters consisted of 19 classes, namely Actinopteri, Appendicularia, Bivalvia, Branchiopoda, Cirripedia, Cnidaria, Copepoda, Ctenophora, Enteropneusta, Gastropoda, Gymnolaemata, Hydrozoa, Malacostraca, Ostracoda, Ophiuroidea, Phoronida, Polychaeta, Sagittoidea, and Thaliacea. The zooplankton found in abundance were Calanoida, Cyclopoida, and Nauplius. The number of taxa and abundance varied according to sampling time and location, 7-34 inds/m3 and 627-41386 inds/m3, respectively. The diversity, evenness, and dominance indices varied, 0.885-2.108, 0.327-0.797, and 0.172-0.601, respectively. Based on the results of these calculations, it can be stated that the diversity, evenness, and dominance of the zooplankton in these waters are classified as moderate.
Domestication of Bileh Fish Rasbora sp. Origin of Aceh Waters Through Different Feed Therapy
Authors: Zulfadhli  , fadhillah Radhi , Jusadi Dedi , Fujaya Yushinta 
Published: March 2023

Abstract
Domestication is the process of taming fish from the wild to the aquaculture environment. There are 3 stages of the domestication process, namely: taming/adapting to the aquaculture environment, seeking fish to grow, and seeking fish to reproduce. Bileh fish can already be adapted to aquaculture containers, which is the first stage of the domestication process. However, information on suitable feed for fish growth is still limited. The aim of this study was to determine the effect of different feeding on the growth of bileh fish reared in controlled containers. The research method was experimental and used a completely randomized design (CRD), which consisted of 4 treatments (P) with 3 replications. The treatments given were artificial feed (P1), artemia (P2), rotifer (P3) and daphnia (P4). The research phase included preparation of containers, collection of bileh fish, experimental feed, maintenance, and data collection. Parameters taken and evaluated included: specific growth rate (SGR), absolute length growth (ALG), and survival rate (SR). The data were processed and analyzed with statistics (Anova). The results of statistical analysis showed that feed treatment had a significant effect on SGR (P<0.05), but had no significant effect on ALG and SR (P>0.05). The best treatment was P1 (artificial feeding) with an SGR value of 0.91%/day, ALG of 1.03 cm and SR of 100%.
Calculation of Waste Generation and Composition in Tegal City as an Effort to Increase Waste Reduction
Authors: Widiyanto Bayu , Aji Fathurakhaman M. , Munadi  
Published: March 2023

Abstract
The generation of waste will increase along with the increase in population. Meanwhile, the composition of waste will change every year due to changes in the lifestyle and economic level of the community. Tegal is a densely populated city, and the accumulation of garbage in the city of Tegal in the last two years has increased by 38.9%. The existing waste management paradigm is still conventional so the amount of generation that enters the Final Disposal Site is still quite large. The purpose of this study is 1) to determine the generation and composition of waste in the Educational Area, offices, markets, and other public facilities. 2) find out the percentage of managed waste. The study began with surveys and interviews regarding the sources of waste and the existing conditions of waste management in the city of Tegal. The survey was conducted by reviewing the facilities of garbage bins, temporary shelters, and sources of waste. This research is quantitative in nature and becomes the basis for the proposed solid waste management design. Waste generation and composition were calculated using the SNI 19-3964-1995 method. The results showed that the waste generated was around 261.93 kg/day. Meanwhile, the composition of waste in Tegal City is dominated by organic waste by 66%. The rest is in the form of waste such as; plastic (15%), paper (13%), cloth & leather (4%) the rest is glass and metal, and others. The percentage of Tegal city waste that is managed is 88.8%, which is divided into two, namely: the first is waste handling with a percentage of 77.61% and the second is a waste reduction with a percentage of 11.19%. While the remaining 11.2% is still unmanaged waste.
Competency Evaluation Of Non-Convention Fishing Vessel Crew (Case Study: 30-100 Gt Purseiner In Pati Regency And Pekalongan City)
Authors: Setianto T , Wisudo S H , Imron M , Wiyono E S , Novita Y 
Published: March 2023

Abstract
Indonesia has ratified the international regulations concerning the competence of fishing vessel crews in the form of Standard of Training, Certification and Watchkeeping for Fishing Vessel Personnel (STCW-F) 1995. Many Indonesian fishermen’s competences are not up to standard. The study was conducted on non-conventional fishing vessels because in Indonesia the numbers are dominated.The purpose of this research is to identify and map the competency quality of non-conventional Fishing Vessel Crew in Pati Regency and Pekalongan City with regard to the marine certificates owned by ship crews according to the STCW-F standard. The analysis uses content analysis of regulations and Gap analysis of expertise competence for the Skipper, Chief Engineer, Chief Officer and First Engineer for Purseiner 30-100 GT in Pati and Pekalongan against Minister of Maritime Affairs and Fisheries Regulation Number 33 of 2021. The results show in Pati district and Pekalongan City: the competence of masters is 66.9% and 81.4%, Head of Engine Room 23.1% and 30%, Chief officer 66.9% and 9.1%, and First Engineers are 4.1% and 0%. Recommendations for the fulfillment of the provisions of the Expertise Competency Certification according to the ministerial regulation are by: increasing Awareness, increasing extension of the importance of certification,and strict enforcement of certification rules.
Green finance, energy consumption, and carbon dioxide emissions: A GMM panel data analysis from China
Authors: Tan Jingrong , Chen Lin 
Published: March 2023

Abstract
Environmental and energy issues have become a stumbling block to China’s sustainable development, so opening up a green development path has become the focus of much attention. To investigate the impact of green finance on carbon dioxide (CO2) emissions, this paper uses the difference and systematic generalized method of moment (GMM) estimators. The research sample includes panel data for Chinese 30 provinces from 2000 to 2020. The empirical results indicate that the objective of green finance is to reduce CO2 emissions. Meanwhile, the analysis of the mediation effect leads to the conclusion that green finance reduces CO2 emissions by regulating energy consumption. Finally, this study provides policymakers with new ideas for green finance development and energy conservation.
Study on fracture conductivity under dynamic sand laying mode
Authors: Pan Zhikun , Chen Tunhao , Hu Longqiao , Lv Wenjing , Wang Ming , Li Ben 
Published: March 2023

Abstract
The existing API static sand laying fracture conductivity evaluation experiment ideally believes that the proppant is evenly and statically laid in the fracture, without considering the actual fracturing conditions, the proppant migrates along the fracture and leaks into the formation. In order to more truly simulate the actual fracturing conditions, the experimental study of fracture conductivity is carried out by using the dynamic conductivity testing device, which is closer to the field reality than static sand laying. The parameters of the indoor dynamic sand laying diversion experiment are determined by the similarity criterion and the indoor fracturing fluid rheology experiment. The orthogonal experiment and the shear support fracture dynamic diversion experiment are designed to study the effects of pumping displacement, fracturing fluid viscosity and construction sand ratio on the dynamic sand laying diversion ability, and optimize the on-site construction parameters. The experimental results show that increasing the construction displacement, sand ratio and selecting the appropriate fracturing fluid viscosity have a positive impact on the fracture conductivity of dynamic sand laying support, among which the sand ratio has the greatest impact. Under the condition of effective closure stress of the reservoir, the natural non sanding shear fracture and the dynamic paving shear fracture with 12% sand ratio have no conductivity, which is difficult to meet the requirements of field production. When the 1-3 mm shear joint is dynamically paved with 18% sand ratio and the closing pressure is 30-70 MPa, the conductivity is positively correlated with the sand concentration, but it is nonlinear with the shear dislocation. The shear joint pump injects 18% proppant with sand ratio, which can support the fracture under high closing pressure and provide conductivity. It is necessary to appropriately increase the pump injection ratio of more than 18% sand ratio according to the proportion of on-site shear cracks to effectively support shear cracks.
Research on the development potential of fuel-cell medium-and-heavy trucks in China
Authors: Fang Haifeng , Ding Zhensen , Yao Zhanhui , Wang Jia 
Published: March 2023

AbstractThe development of fuel-cell vehicles is an important opportunity and inevitable choice for China to cope with the challenges of energy security and industrial upgrading and then achieve the “Carbon Peaking and Carbon Neutrality” goal. Taking fuel-cell medium-and-heavy trucks as the research object, this paper builds a multi-dimensional analysis framework of policy, market and technology, further discuss and analyze the development potential of fuel-cell medium-and-heavy trucks in China by sorting out the current situation and studying the development trend of the industry. The analysis results show that China’s fuel-cell medium-and-heavy trucks not only have policy support, market demand and technical support, but also are an important path for the development of fuel-cell vehicles. The research results can be used as a reference for the formulation of industrial policies related to fuel-cell vehicles and have a high reference value for the strategic selection of enterprises’ products in the industry.
Study of the impact of DC distribution network under large-scale electric-powered vehicle access
Authors: Zhang Guangru , Zhang Jiawu , Ma Zhenqi , Chen Jie , Zhang Jialin , Kang Yongqiang 
Published: March 2023

Abstract
As a high-standard verdant method of transportation, electric-powered-vehicles have become the development hotspot of the automotive business in recent years. Large scale access to electric-powered vehicles can form a distributed energy storage system, which can improve the operational performance of power grid peak shaving and frequency modulation, and improve the comprehensive utilization efficiency of system energy. But at the same time, large-scale electric-powered vehicles connected to the DC distribution network will have a certain impact on its topology. Therefore, this paper studies the impact of the access location and number of electric-powered vehicles on the network topology and establishes a multi-dimensional evaluation system of the DC distribution network topology. The application of this result can play an evaluation and guidance role in the operation stability of the DC distribution network in the case of large-scale access to electric-powered vehicles.
Preparation of hydrophobic nano calcium carbonate and its application in EOR
Authors: Kaiping Tian , Wanfen Pu , Siying Li , Hongzhou Wang , Wei He , Minghong Xia 
Published: March 2023

Abstract
W/O emulsification flooding is a new type of oil displacement method, which can effectively improve oil recovery, but there are few materials used for W/O emulsification at present. Therefore, we prepared a hydrophobic nano calcium carbonate (WS-Ca) and compounded it with Span80 to form a nano oil displacement system. The contact angle experiment demonstrates that WS-Ca is lipophilic material. After testing the emulsification performance, viscosity, interfacial tension and oil displacement performance of the oil displacement system, it is found that the nano oil displacement system with the best performance is WS-Ca (800ppm) +Span80 (1%), and the displacement system and oil are emulsified into W/O emulsion, and the viscosity of emulsion is 25 times that of crude oil. Furthermore, the oil displacement system can successfully lower the oil-water interfacial tension and increase the oil recovery of injection water to 62.63%.
Power distribution system for Xiangshan Internet of Underwater Things
Authors: Duan Zhiyong , Xing Zilin , He Bohao , Hu Jiaqi , Yang Canjun 
Published: March 2023

Abstract
The Xiangshan Internet of Underwater Things was successfully deployed in Xiangshan in September 2022, which is the first multi-node constant current cabled observatory network in China. Instead of being a real scientific IOT, the main motivation of this network is to verify the main energy conversion technologies applied in the Internet of Underwater Things, including multi-module-stack architecture electrical energy conversion system, digital branch unit, and fast deployable in-cable submarine observation node. The experiments verified that the system can guarantee the reliability and high efficiency of the Internet of Underwater Things.
RETRACTED: A design of wet-mateable connector aiming for contactless power transfer and optical communication
Authors: Hu Jiaqi , Duan Zhiyong , Yi Anzhe , Zhang Yurui , Yang Canjun 
Published: March 2023

Abstract
At present, contact watertight connectors are commonly utilized for the connection between underwater electromechanical equipment and the seabed observation network. Such conventional watertight connectors are inevitably likely to be irreversibly worn when plugging and unplugging, besides complicated sealing structures and limited service life. This paper designs a Wet-Mateable connector aiming for Contactless Power Transfer and Optical Communication (PTOC-WMC), which is based on technology of Contactless Power Transmission (CLPT) and optical communication. Docking structure of the sockets and plugs are designed, facilitating Remotely Operated Vehicle (ROV) to operate. A prototype of the PTOC-WMC was established. The experimental results show that the connector designed can achieve 200W power transmission, with a maximum power transmission efficiency of 94%. The communication bandwidth reaches 18MHz. The PTOC-WMC can assist the rapid and safe deployment and operation of seabed observation network.
Study on the mechanical variation law of the integrated water plugging operation string in horizontal wells
Authors: Dajian Li , Wei Lin , Lijing Chang , Zubo Su , Hongzheng Zhu , Bai Wang 
Published: March 2023

Abstract
In order to study the force change law of the water plugging operation string in the complex wellbore, and to reduce the failure risk of the process string during the water plugging operation, this paper establishes the water plugging operation string based on the Euler-Bernoulli beam theory- The 3D full-well finite element model of the borehole wall was verified by field test data to verify the credibility of the numerical simulation model; according to the established finite element model, the force study of different types of tubing in complex horizontal wellbore was carried out, mainly for axial The force and the change law of the contact force between the pipe string and the well wall are analyzed, and finally, the force change law of the pipe string in different well sections is analyzed. The results show that the finite element model established in this paper has high simulation accuracy, and there is a large lateral contact force between the tubing and the inlet of the pitching section during the lifting process, and the contact between the pipe string and the borehole wall during the lowering process Mainly occurs at the entrance of the horizontal section. The research results provide theoretical guidance for the selection of tubing types and water plugging operations.