bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on diagnosis model of low-voltage distributed photovoltaic users increasing power generation without authorization
Authors: Shang Ying , Liu Xinran , Kang Liyan , Liao Liying , Cui He
Published: May 2023

With the promotion and popularization of national distributed photovoltaic projects, more and more residential users install distributed photovoltaic, which increases the income for residential users. However, for power companies, it is difficult to find out whether there are problems in the operation of photovoltaic equipment and whether users increase capacity privately during photovoltaic operation. Starting with the low-voltage distributed photovoltaic acquisition scheme, this paper establishes a low-voltage photovoltaic private capacity increase diagnosis model, so as to actively identify abnormal power generation and ensure the stability and safety of power grid operation.
Multi-layer Voltage Control Strategy for DC Microgrid without Communication
Authors: He Yuchao , Li Lirong , Qian Huimin , Yao Shenghong
Published: May 2023

This paper presented a multi-layer voltage control strategy for a stand-alone DC Microgrid. The unbalanced power of the system is compensated by the hybrid energy storage. The bus actual voltage is used as a message to implement the coordination of various terminals. By dividing the bus voltage, different voltage layers correspond to different working modes of each terminal of the system. The novelty of the presented control strategy is that the energy management performance of the DC Microgrid is improved, which is independent of the communication link. The DC Microgrid model is established in MATLAB/Simulink environment, and the simulation result shows that the presented strategy is feasible under different setting scenarios.
Voltage Optimization Control and Risk Assessment Technology for High-proportion Distributed Photovoltaic Access to Distribution Network
Authors: Xu Ke , Wang Yang , Li Zepeng , Li Xiaoqian , Song Honghe
Published: May 2023

The high proportion of distributed photovoltaic connected to the distribution network will lead to an increase in terminal voltage and network loss, which will not only generate many adverse effects on the safe and reliable operation of the distribution network but also easily lead to power supply disconnection and power supply interruption accidents caused by voltage out of limit. At present, the voltage control of the distribution network does not fully consider the regulation characteristics of the photovoltaic inverter itself and ignores the impact of different control methods on the distribution network security risk management and control. Therefore, this paper establishes a voltage closed-loop control model for high-proportion distributed photovoltaic access to the distribution network and proposes a real-time active voltage optimization control strategy with the goal of minimizing the deviation of the actual operation state of the distribution network from the scheduling plan. Finally, a typical industrial park is taken as a case for calculation and analysis. The results show that using real-time data to formulate a real-time voltage optimization control strategy can not only ensure the economic operation of each voltage regulating unit in the distribution network but also reduce operational risks. The control method proposed in this paper provides a new idea for improving the voltage control level of distributed photovoltaic access distribution network and fully guarantees the operation reliability of the entire distribution network.
A micro-force measurement torsion pendulum design with dual laser detection
Authors: Zhao Yujie , Wu Bojian , Jia Yuandong , Li Zongfeng
Published: May 2023

Aiming at the ground test and evaluation of the suspended test bench of the high microgravity scientific experiment cabinet in the Tianhe core module of the space station to obtain its exact thrust resolution, a micro-force measurement torsion device with dual laser detection is designed. The main configuration of the device is the suspension fiber torsion pendulum, and tungsten wire with a length of 400 mm and a diameter of 800 μm is used as the suspension fiber. Under micro thrust, the suspension fiber is twisted, which drives the mirrors at both ends of the scale arm to rotate along the suspension fiber. The displacement detection of the reflector is carried out, and the magnitude of the micro thrust is calculated in combination with the theorem of momentum. Experimental results indicate that the design of the torsion of micro-force measurement provides an effective test method for the ground test of the suspension test bench. The device can be used to measure and evaluate the micro-propulsion force of the air jet port. After replacing the tungsten fiber with a diameter of 1mm, it can also replace the air floating platform to carry out the air jet closed-loop control verification work, which can effectively and accurately complete the ground test and evaluation of the suspension test bench.
Semiconductor Bridge Temperature Change Study under Different Excitation Methods and Sizes
Authors: Huang Nianrong , Feng Feng , Duan Jianing , Tan Bingdong
Published: May 2023

The temperature of the semiconductor bridge increases due to the Joule heat effect in the way of capacitive discharge voltage excitation and current excitation, but the temperature distribution and the effect of different excitation methods and different sizes on the temperature change are not very clear; aiming at this problem, the temperature distribution of the semiconductor bridge after electrical energy excitation is simulated by finite element simulation. The effects of excitation mode and bridge area size on the temperature rise process of the bridge were studied by the control variable method; finally, the high-temperature area of the bridge body is only distributed in the bridge area, the temperature of the bridge body is positively correlated with electrical energy but negatively correlated with the area of the bridge area, and the current excitation method is better than the effect of voltage excitation. In addition, the conclusion is that the appropriate increase in excitation energy and the reduction of bridge size can help the temperature rise to improve the efficiency of the semiconductor bridge in practical applications.
Structure design and analysis of upper limb wearable passive power-assisted exoskeleton robot
Authors: Ning Yeyan , Li Yunji , Zhang Zhenyu , Liu Kaixuan , Liu Jianwen , Cai Jun , Wang Chunlei
Published: May 2023

The upper limb exoskeleton robot has been a key research direction at home and abroad in recent years. Still, the existing upper limb exoskeleton robot has poor coupling with the human body, and the power assistance effect could be better. In this paper, the strength of each muscle group of the upper limb when the human body is carrying objects is measured as reflected by the surface EMG signal of the human body, and the human kinematics is analyzed to guide the design of the passive exoskeleton robot of the upper limb. First, the spring tension and compression system model is established for the upper limb of the human body. The model is statically analyzed, the forces and moments on each joint are calculated, and each muscle’s actual output data when carrying objects is estimated. Based on the muscle kinematics model, a passive upper limb exoskeleton robot is designed. The robot is divided into three modules, namely, the arm module, shoulder module, and back module, using ergonomics and modular design ideas. The energy storage module and joint degree of freedom of the exoskeleton are analyzed to ensure that the exoskeleton meets the requirements of ergonomics, and the key components are checked and simulated. The results show that the designed upper limb wearable passive power-assisted exoskeleton robot meets the strength requirements, which verifies the rationality of the structure design.
Civil Aircraft Airworthiness Noise Measurement
Authors: Chen Ling , Li Qiang , Zhang Yizhi , Xu Liang
Published: May 2023

Civil aircraft noise is the main source of the airport and its surrounding areas, in recent years, with the continuous development of the air transport industry, aircraft noise has attracted more and more public attention, according to the International Civil Aviation Convention Annex 16 Volume I [1] and China Civil Aviation Regulations CCAR36 [2] Aircraft Type and Airworthiness Certification Noise Regulations. The noise limit requirements for transport aircraft are put forward. According to the requirements of the regulations, it is the key to determine that the aircraft meets the requirements of the regulations to obtain the noise data through flight tests and to obtain the equivalent perceived noise level through data processing. In the process of noise certification flight test, the noise measurement system should be arranged accurately in strict accordance with the requirements of airworthiness clauses, to accurately measure and record the noise and obtain the required data. In this paper, the noise airworthiness certification flight test of a certain type of civil aircraft is taken as an example, and the noise measurement system of civil aircraft is designed.
Research on automatic driving control strategy based on improved model predictive control
Authors: Chu Jianzhen , Zhang Qingyu , Wang Zengxi , Jia Tong
Published: May 2023

As a new technology direction in the automotive industry in recent years, automatic driving technology has played an important role in reducing traffic accidents, promoting energy conservation and emission reduction, and improving the efficiency of high-speed and urban roads. As one of the key technologies of autonomous vehicles, the performance of control algorithm greatly affects the smoothness of vehicle driving and the accuracy of track tracking. In order to consider the lateral control and longitudinal control accuracy at the same time, and ensure that the vehicle travels according to the given trajectory, this paper first establishes the vehicle kinematics model, and improves the traditional model predictive control algorithm, which realizes the high dynamic control of the desired trajectory while ensuring the vehicle stability and comfort. Finally, based on the built real vehicle test platform for automatic driving, the acceleration and deceleration test and the high-speed serpentine test are designed. By analyzing the test data, it can be seen that the control algorithm proposed in this paper can effectively achieve the vehicle trajectory tracking, and the control accuracy is improved.
Experimental study on fuselage fuel hose guillotine test of civil aircraft
Authors: Xiao Haibin , Wu Zhibin , Liu Degang
Published: May 2023

The crash-worthiness design of civil transport aircraft fuel systems is significance to improve the safety of the aircraft in the case of a crash. CCAR25.993 (f) requires that “fuel feed line in the fuselage shall be assembled to allow reasonable deformation and tension without fuel leakage”. Fuel system fuselage fuel supply line with the appropriate hose configuration can take the advantage of the ductility of the material, and the guillotine test is accepted by worldwide examiners to validate the deformation and tensile capacity of the fuel hose to keep it from leaking fuel.
Engineering Application Method Of A New Satellite Simulation Test System
Authors: Luo Tao , Jia Yuanmei , Xue Kai , Pan Le , Sun Huamiao , Wang Xianjie
Published: May 2023

This paper studies a new simulation test system, which integrates the satellite management and attitude track control software test system, realizes the test configuration and equipment generalization, improves the system universality and automation capability, effectively saves human resources, and equipment costs, shortens the test cycle, avoids quality problems caused by human uncertainty, and improves the efficiency of software development on the satellite.
Orbit and sequence planning method for space multi-target skimming observation
Authors: Liu Yuhao , Fang Zijin , Zhang Bing
Published: May 2023

Based on the research of space-based multi-target skimming observation, this paper studies the observation sequence and observation orbit path planning of low Earth orbit (LEO) targets with the goal of fuel optimization. Based on the Lambert intersection algorithm and branch and bound algorithm, a two-layer branch and bound multi-target transfer observation model is established. Through the first layer of this model, the optimal observation sequence and the target location when the fuel is optimal are obtained. To obtain the global optimal solution, the target position is expanded spherically and the optimal skimming observation point of the corresponding target is determined by using the second layer of the model, and then the optimal multi-target observation orbit is found. Finally, the simulation results obtained by using the model are analyzed and compared with the Hohmann transfer speed increment to verify the reliability of the simulation results.
Research on Train-to-Train Communication Resource Allocation for Urban Rail Transport
Authors: Zhang Ruofan , Mi Gensuo
Published: May 2023

As communication technology improves and urban rail communication system develops, the new CBTC (Communication-Based Train Control) system built upon train – train(T2T) communication has become the mainstream of future rail transit signaling systems. In the future train-centered CBTC system, Train-to-Ground (T2G Train-to-Ground) mode may coexists with T2T communication mode. To reduce the interference and ensure the reliable transmission of information and system security, a joint channel allocation and power control communication resource distrbution method is proposed, which firstly allocates channels to users by the Hungarian algorithm, and then make use of sparrow search algorithm to coordinates the user’s transmit power. Obtained by simulation results, this suggested strategy not only reduces interferences caused by resource sharing and satisfies the dependability of the system, but also significantly improves the throughput of the system.
Optimization of Fuel Supply Strategy for LNG Dual-fuel Ships
Authors: Li Shuting , Zhang Pengshi , Sun Zhuo
Published: May 2023

Fuel cost is an important part of voyage cost, and fuel replenishment strategy is an important decision affecting the operating cost and benefit of shipping companies. A mixed integer nonlinear programming model of fuel supply for LNG dual-fuel ships is established to expand the research scope of fuel supply in the shipping industry to minimize fuel cost. In this paper, the genetic algorithm is improved, the solving steps are designed, and the validity of the model and the algorithm are verified by example analysis. The results show that as long as the LNG price does not exceed 120% of the LSHFO price, the LNG dual-fuel ship can still reduce the fuel cost during the voyage. The lower the LNG price, the larger the LNG fuel tank capacity and the higher the proportion of fuel cost saved. When the fuel market fluctuates, the model can provide a scientific basis for shipping companies to determine the type of ship fuel, optimize the speed, and select the fuel port and fuel volume.
Runoff prediction based on a VMD-LSTM model considering the decomposition error
Authors: Ma Ya-Rong , Yang Jing , Li Hao , Liao He , Feng Yu-Xin
Published: May 2023

For increasing the forecasting accuracy of runoff, a combined prediction model composed of the variational mode decomposition (VMD) and long short-term memory network (LSTM) is investigated in our manuscript. Firstly, data from the runoff is decomposed into three modal components via the VMD algorithm, for reducing the complexity of the original data. In addition, decomposition error is also been considered in this paper, and the hidden information in the series is extracted. Three subsequences and the decomposition error are handled by the LSTM method, respectively. Superimposing the prediction results, the prediction result of the runoff is thus derived. Experimental analysis is carried out, and a comparison of the VMD-LSTM model and other algorithmic indicates that the model constructed in our manuscript is more valid for predicting the runoff.
Optimal design of electromagnetic interference of LED lamp switching power supply based on TRIZ theory
Authors: Luo Xiang , Ma Lin , Chen Shijie , Lin Xiao , Liang Zhanpeng
Published: May 2023

The innovation method TRIZ is an innovative methodology that can analyze problems and solve them and has been widely used in many fields. In this paper, TRIZ theory is applied to optimize the design of the electromagnetic interference (EMI) problem of a model of LED lamps and lanterns switching power supply. The tools of resource analysis, component analysis, functional analysis, and cause-effect analysis are used to analyze the problem of excessive EMI encountered in the design of LED lamps and lanterns, and the tools of technical contradiction and material field analysis are used to improve the problem of reducing EMI. Two solutions are obtained to improve the problem of high EMI by changing the Power inductor design method of the input voltage and by adding capacitors to form a Π-type filter circuit.
Research on BIM collaborative design for the outdoor integrated pipeline of a rail transit depot
Authors: Wu Honghua , Xu Jiuyong , Jin Yongle , Li Qiang , He Wei , Zhang Panfeng , Zhang Jie , Li Jianan
Published: May 2023

The outdoor integrated pipelines of rail transit depots have many specialties, many interfaces, and complex cross-relationships, which are the key and difficult points of depot design. The traditional outdoor integrated pipeline design method has the disadvantages of a large amount of data calculation, error-prone, and low drawing efficiency. At present, the use of BIM technology for auxiliary design also has difficulties, such as slow modeling speed, inconvenient collaborative design, and low efficiency of 3D conversion of 2D drawings. Based on Revit software, this paper focuses on the specific implementation scheme of BIM collaborative design of outdoor integrated pipelines in depots to solve the appealing problem. Overcame a number of key technologies independently developed, such as depot family library construction, Dynamo visual programming track rapid modeling, and GLS rapid drawing software. Realization of outdoor Comprehensive pipeline rapid modeling, collision optimization, and 2D rapid plotting. And it has been applied in an overhaul and heavy repair depot in the southwest, which has greatly improved the design efficiency and quality of outdoor integrated pipelines. The research result can provide a theoretical reference for the BIM collaborative design of the outdoor integrated pipeline of the depot.
Design of envelope analysis software for LNG unloading arm based on MATLAB App
Authors: Deng Chenhui , Yu Bo
Published: May 2023

According to investigate the current situation of the envelope of LNG unloading arm, this paper in view of the relationship between the structure and the envelope of LNG unloading arm, a complete set of calculation program is designed by using the app designer of MATLAB which can automatically generate the envelope according to the hydrological conditions. The program can be used to guide the emergency disengagement process of the unloading arm in case it can work safely on the LNG terminal in the actual project. This paper provides a design basis for promoting the domestic development of LNG unloading arm.
Study on Student Attendance System Based on Face Recognition
Authors: Chen Xuexiao
Published: May 2023

Student attendance is not only an important indicator for the school to inspect students’ achievements, but also an objective evaluation of teachers’ teaching quality. In the system, we use PyCharm as the development platform, design the system interface through QT Designer (QT5), use PyQt5 library to write the function of interface controls, use MySQL as the database, and use OpenCV face recognition algorithm to recognize, thus realizing an attendance system based on face recognition. The system is divided into two parts: attendance and face recognition. Through the test, the number and quality of members can be monitored in real-time. The traditional attendance method of manual statistical management is abandoned, and the method in this paper provides a scientific basis for the implementation of the campus attendance system.
Multi-scale attention mechanism network for Nonintrusive load decomposition
Authors: Tang Weidong , Zhang Hong , Zhang Xiaodong , Zhuang Wei
Published: May 2023

Nonintrusive load decomposition is an important prerequisite to realize intelligent power monitoring and a key application of the smart grid. The existing algorithms cannot achieve the decomposition effect with high accuracy and have poor performance in low-frequency loads. To solve these problems, a method based on a multi-scale attention mechanism network is proposed. First, construct the hole residual attention module to extract the deep features and help the network learn the important features of high peak areas and low-frequency electrical appliances in the time series data. Then, the multi-scale fusion module is proposed to fuse the characteristic information after the convolution operation of different scales. Finally, the decomposed active power values of multiple target electrical appliances are output through the full connection layer. The proposed work can decompose the load characteristics of each electrical appliance in the house by the nonintrusive method. The experimental results on the dataset indicate that this work can reduce the decomposition error and has excellent load decomposition capability compared with the existing methods.
Cross-Camera Multi-Object Tracking based on Person Re-Identification and Spatial-Temporal Constraints
Authors: Li Jiayue , YanPiao
Published: May 2023

In order to reduce the influence of occlusion on the overall feature representation of tracks and improve the accuracy of track correlation between cameras, this paper proposes a cross camera multi-target tracking method based on person appearance and spatial-temporal constraints: a new cross-camera multi-object tracking framework is constructed. Then the person spatial-temporal probability model is established. Finally, the spatial-temporal probability model and the person appearance similarity are jointly measured and the person trajectory correlation under cross-camera is completed by using data correlation; Comparative experiments on the dataset proved that the method is effective.
Research on UWB indoor 3D positioning algorithm based on the least squares method
Authors: Li Chen , Li Shanhong , Cao Pingguo , Song Quanjun
Published: May 2023

With the increased use of rescue robots in indoor scenarios, the requirements for indoor location services are becoming more stringent. Traditional GPS positioning cannot provide accurate location information indoors, while ultra-wideband (UWB) has been widely used for indoor positioning due to its high accuracy and penetrating power. When solving 3D positioning coordinates using UWB least squares in line-of-sight situations, the positioning accuracy is easily affected by the layout height of the base station. In this paper, we first improve the positioning algorithm and then find a better way of base station layout in the actual positioning environment to improve the tag positioning accuracy. The algorithm improvement is based on the following ideas: firstly, the initial positioning results of the tag are obtained using UWB least squares and spatial geometric relations, and the 3D coordinates of the tag are solved using Gauss-Newton iterative method, and finally combined with the Kalman filter for optimization. The base stations are laid out in such a way that adjacent base stations are not at the same horizontal height and relative base stations are at the same horizontal height.
Growth response and yield of potato plant with applications of rhizobacteria and mycorrhizal
Authors: Warnita  , Yanti Y , Suwinda R
Published: May 2023

The potato plant is a primary horticultural crop that can be used in place of food diversification. The study’s goal is to find the best interaction between rhizobacteria and mycorrhizal on the growth and yield of the potato plant. This study was conducted at the Andalas University, Padang Faculty of Agriculture’s Microbiology and Plant Physiology Laboratories and experimental garden Institute Assessment and Agricultural Technology in Sukarami Solok, from July to December 2018. A 2-factor factorial design with replication and a fully randomized design was employed CRD. The type of rhizobacteria is the first factor: no Rhizobacteria, RZ.1.L2.3, RZ.3.L2.1, RZ.3.L2.2, RZ.1.L2.3, and the second factor is Multispora, Acaulospora, Glomus SP2, and Sclerocystis. Each treatment was replicated three times, consisting of 60 experimental units. The data were analyzed using the STAR application whit a 5% F test, and if significantly different, followed by a 5% HSD test. The outcome demonstrated an interaction between rhizobacteria and mycorrhizal on the fresh weight of the tuber.
The effects of several concentrations of BAP and source of explants to gambier shoot induction (Uncaria gambier (Hunter) Roxb)
Authors: Zainal A , Anwar A , Gustian  , Fitriawati  , Yunita R
Published: May 2023

Gambir is a type of plantation plant that has many benefits. Gambir extract can be used for the food, cosmetic, pharmaceutical, and leather tanning industries. However, the availability of gambier has decreased in production. Hence, information and technology for propagating Gambir seeds in vitro is needed. The growth of plant explants can be impacted by the application of growth regulators and explant sources in-vitro. This study’s purpose was to ascertain the connection between BAP concentration and explant sources concerning the development of gambier shoots. In addition, it is also to obtain of BAP and the best source of explants for the induction of the gambier shoots. In this study, a Factorial Completely Randomized Design (CRD) with 6 treatments that were each repeated five times was used. There are two levels of explant source and three levels of BAP concentration, the first of which is the concentration of BAP (2 mg/l, 4 mg/l, and 6 mg/l) (the first node and the third node from the shoot). The findings demonstrated that, in general, 100% of shoots could form when BAP and explant sources were concentrated. The concentration of BAP and the origin of the explants significantly influenced the emergence time of the shoots, with the quickest time of budding occurring after 3.8 days at a concentration of 2 mg/l BAP at the third node. 6 mg/l BAP was the optimal treatment for increasing the number of gambier leaves and shoots.
The growth of groundcherry (Physalis angulata L.) under low salt treatment
Authors: Sholehah D N , Hariyanto S , Purnobasuki H
Published: May 2023

The development of crop cultivation technologies is required to augment crop productivity. It is critical to feed the expanding population in the world. This study aims to characterize the growth of groundcherry (Physalis angulata L.) under low salinity. The study was carried out in Bangkalan, a district on Madura Island. The treatments consisted of the application of 0 mM salinity concentration (A1) and the application of 20 mM salinity concentration in the vegetative stage (A2), generative stage (A3), and during cultivation (A4). The study was designed using eight replication in a randomized block design. Each replication comprised three plants. The root length, leaf number, height of the plant, stem diameter, fruit number, and fresh and dry weights, were measured to determine growth. The study result showed that low salinity affected the leaves number, fruit number, and dry weight. The application of 20 mM salinity concentration at the generative stage (A3) and during cultivation (A4) gave the highest growth of groundcherry.
Impact of rice husk biochar date on the growth and production of edamame (Glycine max L. Merrill) in Ultisol
Authors: Marwiansah R , Ardi  , Warnita W
Published: May 2023

Edamame is one of the food crops that are in great demand by the public. Limited fertile land causes edamame cultivation to be expanded by using marginal land. Therefore, it is necessary to improve soil quality by using biochar rice husk biochar can be used as a soil enhancer which has a positive effect on soil properties. This study aims to obtain the best dose of biochar in edamame cultivation on Ultisol. This research was carried out from February to May 2022 in the field and in the Plant Physiology Laboratory, Faculty of Agriculture, Andalas University. This study consisted of 6 treatments with 4 replications arranged according to a Completely Randomized Design (CRD). The treatment was biochar, namely 0 tons/ha, 5 tons/ha, 10 tons/ha, 15 tons/ha, 20 tons/ha and 25 tons/ha. The data obtained from the observations were analyzed statistically with the F test at a 5% significance level. If it is significantly different, then further test is carried out Duncan’s New Multiple Range Test (DNMRT) further test at a 5% significance level. The results showed that the best dose of 20 tons/ha of rice husk biochar on relative growth rate, net assimilation rate and root crown ratio. but had no effect to plant height, the number of pods per plant and weight of 100 seeds.
Assessing soil organic carbon stock under different land-uses in Koto XI Tarusan District, West Sumatra
Authors: Bustamar A , Juniarti  , Emalinda O , Gusnidar  , Fiantis D
Published: May 2023

Organic carbon in soil can be utilized to assess soil quality and aid to climate change mitigation. Soil organic carbon stock assessment in West Sumatra is still limited. This research focused on soil organic carbon stock distribution in various land-uses in Duku, Koto XI Tarusan, Pesisir Selatan Regency. Research area included secondary forest, scrubland, paddy field, and dryland agriculture. Soil samples were obtained by stratified sampling. Samples were taken at depths of 0-30 and 30-60 cm from each land-use type with the same slope and soil type. A soil unit polygon was randomly selected for sampling. 21 samples were collected and analyzed for bulk density, texture, soil respiration, total nitrogen content, and organic carbon. Secondary forest had the highest soil organic carbon storage (128.82 - 294.09 tons per hectare), followed by paddy fields (16.99 - 227.14 tons per hectare), dryland agriculture (10.40 - 65.43 tons per hectare), and scrubland (13.39 - 53.19 tons per hectare). Nitrogen content was higher in secondary forest>paddy soil>scrubland>dry land. Bulk density was found to be higher in scrubland than in dry land, paddy soils, and secondary forest. Soil pH was greater in paddy soil>scrubland>dryland>forest.
Diversity of Hymenoptera parasitoid on oil palm (Elaeis guineensis Jacq.) plantations in Dharmasraya District, West Sumatra Province
Authors: Ikhsan Z , Suhendra D , Hidrayani
Published: May 2023

Oil palm farmers in Dharmasraya District always strive to increase oil palm production and productivity. The biotic factors can affect the presence of Hymenoptera insects. Most of the Hymenoptera insects are parasites. The research aimed to study the diversity of Hymenoptera parasitoids in oil palm plantations in young oil palm plantations (2-3 years old) and older oil palms (5-20 years old) in Dharmasraya District. Sample points were determined using the transect line method on the land. Sampling was carried out using three traps: 1) yellow pan traps, 2) malaise traps, and 3) Sweep net. The analysis was carried out by calculating the Shannon-Wiener diversity index (H’), the Margalef species richness index (D), the Pielou species evenness index(J), the Jaccard similarity index (Is), and the estimated species richness of Hymenoptera parasitoid. Hymenoptera parasitoids found at the research sites were 1,267 individuals consisting of 23 families and 142 morphospecies. Two young oil palm plantations have a higher diversity of Hymenoptera parasitoids (4.15; 4.24) than older oil palm plantations (3.51; 3.86). The Braconidae, Ichneumonidae, and Scelionidae families dominated the abundance of Hymenoptera parasitoids. Young oil palm plantations have a higher diversity of Hymenoptera parasitoids than older oil palm plantations.
Detection of pathogens to test seed health of some food crops in storage
Authors: Suhendar M A , Koswanudin D , Hidayatun N , Diantina S , Manzila I , Try Zulchi P H , Wawan
Published: May 2023

The health condition of the seed, which is defined by the presence or absence of seed-borne microbes like fungi, bacteria, nematodes, or viruses, is one aspect that affects seed quality. The purpose of this study is to assess the health of some food crop seeds by looking for fungus and bacteria. The Pathogen Detection Laboratory, Division of Management of Genetic Resources (ICABIOGRAD), conducted this investigation in 2019. The Gen Bank collection and rejuvenation were the sources of the tested seeds. The use of moist blotter and agar procedures allowed for the detection of fungi and bacteria. 100 accessions of each of the following: rice, maize, soybeans, peanuts, sorghum, and cowpea had their seed health evaluated. Under a microscope, pathogens are observed growing, and their pathogenic properties are identified using the relevant literature. According to the findings, 12 maize accessions had fungal infections and 8 had bacterial infections. In peanuts, fungus and bacteria were found in 11 and 14 accessions, respectively. As opposed to 16 accessions of sorghum being infected with fungi and 18 accessions being infected with bacteria, nine accessions of soybeans had fungi and eleven accessions had bacteria. 18 accessions of the rice commodity had fungal infections, while 15 had bacterial infections. A total of 26 cowpea accessions had fungal infections, while 23 had bacterial infections. Even with relatively low infection rates (0–10%), fungus and bacterial infections on stored seeds are always present, with the exception of cowpea.
Natural enemies of Spodoptera frugiperda J.E Smith (Lepidoptera: Noctuidae) on corn plants in West Sumatera
Authors: Sari W , Nelly N , Hidrayani  , Yaherwandi
Published: May 2023

One of the harmful pests that attack corn plants in Indonesia is Spodoptera frugiperda. This invasive insect was detected in the West Pasaman district in 2019. Outbreaks of S. frugiperda have spread to nearly every region of Indonesia. There have been no reports of natural enemies of S. frugiperda in West Sumatera. The study’s objectives were to count the number of S. frugiperda individuals in each location and to identify the natural enemies. The research was conducted in West Pasaman, Padang Pariaman, Tanah Datar, and Limapuluh Kota as centers of corn cultivation from March to August 2021. Sampling was done in four districts by selecting three sub-districts in each district, then two villages in the sub-district. Sampling was carried out by purposive random sampling, and larvae were taken only during the vegetative phase of corn plants. To get natural enemies, parasitoids, nematodes, and entomopathogens were obtained from larvae reared in the laboratory. For predators with direct observation if found preying on S. frugiperda. The results showed that S.frugiperda had a different number of individuals in West Sumatra. Coccinellidae predators, entomopathogenic fungi, nematode parasites, and parasitoids were found in the field. Microplitis sp. was a common parasitoid found in almost all districts, with a parasitization rate of 5.91%.
Bioactivity a mixture of spiked pepper fruit extract and fish-poison bean leaf extract against Spodoptera frugiperda (Lepidoptera: Noctuidae)
Authors: Lina E C , Reihan A , Hidayatullah M S
Published: May 2023

The active compounds on spiked pepper (Piper aduncum) fruit extract and fish-poison bean (Tephrosia vogelii) leaf extract have a potency used as botanical insecticides as alternative pest control. This study was conducted to determine the activity of mixed extracts of Spiked pepper fruit and Fish-poison bean leaf extract against the new invasive pestSpodoptera frugiperdalarvae. This study was held from February 2021 to November 2021 at the Insect Bioecology Laboratory, Faculty of Agriculture, Andalas University, Padang. The experiment consists of a preliminary test and an advanced test. The advanced test was conducted using six concentrations and five replications of a mixture extract of Spiked pepper and Fish-poison bean. The parameters observed were larvae mortality, feeding inhibition activity (antifeedant), and larval development time. The result showed that the combination indexes of the mixed extract of Spiked pepper fruit and Fish-poison bean leaves (1:1) were additive with the value of LC50and LC95is 0,29% and 0,59%, respectively. Mixed extract of Spiked pepper fruit and Fish-poison bean leaves (1:1) caused larvae mortality, inhibited feeding activity, and inhibitedS. frugiperdalarvae growth. The formulation is needed to increase the mixed extract of Spiked pepper fruit and Fish-poison bean leaves (1:1) activity againstS. frugiperda.
Beauveria bassiana colonization on cabbage and its effect on seed germination and seedling growth
Authors: Yunisman  , Trizelia  , Rusli R , Marhamah S , Rahman E
Published: May 2023

An insect-pathogen fungus called Beauveria bassiana (Balsamo) Vuill. is employed as a biological control for a variety of insect pests.B. bassiananot only acts as an entomopathogen, directly infecting and killing pests, but it also has the ability to live endophyte on plants, colonize plant tissues, and consequently boost growth. This research was undertaken to find out whetherB. bassianacan colonize cabbage and what impact it has on seed germination and seedling growth.B. bassianawas applied to cabbage by soaking the seeds with long soaking intervals of 0, 1, 3, and 6 hours. Cabbage seed germination was observed seven days after fungal application. The results revealed that the fungusB. bassianaincreased cabbage seed germination, radicle length, and plumule. The duration of soaking cabbage seeds withB. bassianaalso affected the cabbage seeds. Soaking cabbage seeds withB. bassianafor one hour is the best time to increase seed germination and the emergence of cabbage seedlings.
Financial analysis of corn farming on the post-gold mine land reclamation technology package in Palaluar Nagari Sijunjung Regency
Authors: Latifa D , Karmaita Y , Yefriwati  , Agustamar  , Yubniati
Published: May 2023

The increasing demand for corn for staple food, industry material and livestock feed shows that the development of corn farming is highly recommended. Utilization of marginal land to meet the needs of corn supply can be implemented on the post-gold mine in Sijunjung Regency. It is crucial to introduce cultivation technology to develop corn farming as an adaptive crop on post-mining land. It aims to produce harvest as expected and generate profit for farmers. The study aimed to analyze the feasibility of corn farming with a reclamation technology package on post-gold mining land. The research method is a case study on the Labuah Luruih farming group that has implemented technology such as land levelling, rich compost and mycorrhiza applications, and agricultural machinery. The research was conducted from April to August 2022. Data analysis used income analysis, R/C feasibility analysis, BEP Price, BEP Production and MBCR Analysis. The results show revenue is more diminutive than costs, R/C < 1, and BEP price and production are still below the break-even point in line with MBCR < 1 at the same price level. The conclusion of the technology package is not feasible when referring to the criteria for financial analysis in this first period. However, in the long term, farming will receive better results. Farmers should apply reclamation technology using collaboration between farmer groups and Nagari institutions.
Analysis of role and determinant factors development of beef cattle farming in Dharmasraya regency West Sumatera province
Authors: Indrayani I , Andri  , Boyon
Published: May 2023

This study aims to investigate the model of beef cattle farming, the role of beef cattle in the development of the livestock subsector, and the determinant factors in the development of beef cattle in Dharmasraya Regency. The method used in this study is a combination of survey and desk study methods. The variables measured were the beef cattle rearing model, the role of beef cattle in the development of the livestock sub-sector, and the determinant factors in the development of beef cattle farming in Dharmasraya Regency. The data analysis used is descriptive statistics, Location Quotient (LQ), and Structural Equation Model (SEM). Results showed that the main job of the respondents (66%) were farmers, who generally (82%) had livestock ranging from 1-5 heads, the raising system carried out by farmers in general (75%) was intensive, most of the farmers (82%) raised their livestock. Access to technology, mainly artificial insemination technology, still needs to be improved. Based on the LQ analysis of the 11 existing sub-districts, 4 sub-districts are the base areas for beef cattle, namely Koto Besar, Koto Salak, Tiumang, and Sitiung sub-districts. SEM estimation results show that technical aspects (X1) and social aspects (X2) have a significant effect on beef cattle productivity (Y1) with the resulting probability value (p) < 0.05. The variable economic aspect (X3) has no significant effect on the productivity aspect (Y1), and the productivity aspect (Y1) has a positive and significant effect on the cattle population (Y2).
Analysis of farmers’ refusal to participate in the Prima 3 Certification Program
Authors: Astuti N B , Analia D , Evaliza D , Fatimah S
Published: May 2023

Providing sufficient food, nutritious and safe to consume, is a must to improve the quality of human life. For this reason, the government has issued Prima-3 certification, which labels safe vegetables and fruit. This study aims to identify the causes of farmers’ refusal of the Prima-3 certification program. The research was conducted using a survey method in Nagari Banuhampu Tanah Datar Regency, and 30 farmers were asked about their opinions of Prima-3 certification. The data collected is further analyzed in quantitative descriptive analysis and presented as tabulation and narrative. The results showed that the farmer’s main reason for refusing in Prima-3 certification program is that Prima-3 certified farmers require more labour than conventional farming. At the same time, the products have the same selling price. For social reasons, smallholders do not get permission from the landowner to participate in the program. This reason is specifically for smallholders only. Even though farmers currently refuse to join in the Prima-3 certification, they still have a high intention to participate in the future if there is a guarantee that the price of certified products is better than non-certified products. While the intention of farmers in the future to follow this program is high value if farmers get a better or higher guaranteed price.
Factors that affect the rice farmer’s income in West Sumatra, Indonesia
Authors: Khairati R , Hakimi R , Azriani Z
Published: May 2023

Agriculture sector gives a significant contribution to the economy of West Sumatra province, with a share of about 22.38% of the Gross Regional Domestics Product of West Sumatra. The proportion of workers involves in this sector is 53.67%, with 872,948 farmers, and among them are 474,047 rice farmers. However, the level of farmers’ welfare is still low, where farmers’ exchange rate is less than 100. This study aims to identify the factors that influence the income of rice farmers in West Sumatra. This is a survey research with the respondent of 200 rice farmer households. This research was conducted in seven regencies and three cities representing the largest number of rice farmer households in West Sumatra. The sample was taken in each selected regency and city with multistage random sampling method. The data were analyzed using multiple regression analysis. The result shows that the factors that influence the income of rice farmers in West Sumatra are: the area of cultivated land, the price of rice, the number of seeds used, the amount of fertilizer used, and the number of workers.
A review of the inflated solar dryer for improving the quality of agricultural product
Authors: Maryana Y E , Saputra D , Priyanto G , Yuliati K
Published: May 2023

Drying is a mass transfer process consisting of the removal of water or another solvent by evaporation from a solid, semi-solid or liquid. This processing technique can be used to preserve agricultural products. Insufficient drying techniques may result in a progressively worse standard of the product. A number of different sources of energy are commonly utilized in drying processes such as fuel or biomass. The shortage of fossil fuels and expensive processes may damage the environment; consequently, solar-energy-utilized dryers become the main choice for drying agricultural crops. The inflated solar-energy-utilized dryers were used to dry agricultural crops because the design was simple and easy to operate and maintain, and the dryers prevented excessive heat on the top layer of the exposed object to the sun’s rays. In addition, they could be installed in new locations in a very short time. This study aimed to review in depth the inflated solar-energy-utilized dryers and found out their advantages. What’s more, it paid particular attention to providing a comprehensive description of the design of inflated solar-energy-utilized dryers and their application to a variety of different agricultural commodities. The results of the study showed that the inflated solar-energy-utilized dryers were both faster for drying and improved the product quality regarding the aflatoxin level and impurities.
A multi-attribute value approach for selection of course modality – A preliminary model
Authors: Juneja P K , Meadati P K , Palreddy S R
Published: May 2023

The pandemic resulted in universities offering more online classes than the earlier norm. The critical question arising with this shift is: are all classes fit for online delivery? Are all students fit for online learning? How can a one-size-fits-all approach be applied to selecting a course modality at different higher education institutions? What shall be the decision criteria for the selection of course modality of different courses for students? This study aimed to find the strengths, weaknesses, opportunities, and threats (SWOT) of online and face-to-face offerings for the construction finance course in the construction management department. The same instructor taught the two different modalities: face-to-face and online. Students at the end of the semester completed a SWOT questionnaire for online and face-to-face learning. The questionnaire covered the following attributes: course content, technology, assignments, tests, grades, communication, and any other attribute the student suggested. The SWOT matrix showed that students had mixed responses toward face-to-face and online course delivery and learning. This study proposes a preliminary multi-attribute value model for selecting course modality. A simple case is formed to show the value of the decision-making framework for the respective decision.