Widiya Nur Permata, Istiadi Istiadi, Rangga Pahlevi Putra
Pine seeds are the seeds of pine trees, which are a type of open-seeded plant known as gymnosperms. Gymnosperm plants have seeds that are not protected by fruit, unlike flowering plants (angiosperms). Pine seeds are typically found inside hard cones. Pine seeds possess several distinctive characteristics, including their small, flat shape and are often equipped with thin wings that aid in their dispersal when released. The process of selecting pine seeds for planting must adhere to established standards of seed quality to enhance desired attributes such as color, texture, and shape in seedlings. Suitable pine seeds for use in planting or propagation are those in a new condition. Quality pine seeds cannot be distinguished by visual inspection alone; alternative tools are required. Given the challenge of differentiating seeds suitable for primary propagation, the researcher proposes a comparison of Pine seed classification using two different methods: the Naïve Bayes Method and K-Nearest Neighbors (KNN). This is expected to enable the accurate detection of pine seeds. The feature extraction method used is the Gray-Level Co-occurrence Matrix (GLCM). The dataset used consists of 165 pine seed samples, comprising 55 images of fresh pine seeds, 55 images of dry pine seeds, and 55 images of decayed pine seeds. Between the two methods, K-NN exhibits the highest percentage value compared to the Naïve Bayes method in the k-fold cross-validation, achieving an accuracy of 95%.
{"title":"Comparison of Pine Seed Quality Classification Using the Naive Bayes and KNN Methods","authors":"Widiya Nur Permata, Istiadi Istiadi, Rangga Pahlevi Putra","doi":"10.31328/jsae.v7i1.5090","DOIUrl":"https://doi.org/10.31328/jsae.v7i1.5090","url":null,"abstract":"Pine seeds are the seeds of pine trees, which are a type of open-seeded plant known as gymnosperms. Gymnosperm plants have seeds that are not protected by fruit, unlike flowering plants (angiosperms). Pine seeds are typically found inside hard cones. Pine seeds possess several distinctive characteristics, including their small, flat shape and are often equipped with thin wings that aid in their dispersal when released. The process of selecting pine seeds for planting must adhere to established standards of seed quality to enhance desired attributes such as color, texture, and shape in seedlings. Suitable pine seeds for use in planting or propagation are those in a new condition. Quality pine seeds cannot be distinguished by visual inspection alone; alternative tools are required. Given the challenge of differentiating seeds suitable for primary propagation, the researcher proposes a comparison of Pine seed classification using two different methods: the Naïve Bayes Method and K-Nearest Neighbors (KNN). This is expected to enable the accurate detection of pine seeds. The feature extraction method used is the Gray-Level Co-occurrence Matrix (GLCM). The dataset used consists of 165 pine seed samples, comprising 55 images of fresh pine seeds, 55 images of dry pine seeds, and 55 images of decayed pine seeds. Between the two methods, K-NN exhibits the highest percentage value compared to the Naïve Bayes method in the k-fold cross-validation, achieving an accuracy of 95%.","PeriodicalId":513206,"journal":{"name":"JOURNAL OF SCIENCE AND APPLIED ENGINEERING","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141694592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This research aims to determine the effect of composition on used tire powder composites, asphalt, and recycled plastic (rHDPE), on tensile stress. The composite is expected Can be used for fenders on cars. The composition variations in this study were 500 grams of used tire powder, and 100 grams of asphalt, with variations of rHDPE 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 200, 250, 300, 350, 400 grams. From the tensile test results, the lowest tensile stress was obtained 0.0233 N/mm2 is owned by a composite with a composition of 40-gram rHDPE. For tensile stress. The highest was a composite with a composition of 400-gram rHDPE with a tensile stress value of 0.855 N/ mm2. The tensile test results of factory-made car fenders have a tensile stress of 0.852 N/mm2. From this research, it can be concluded that composites with composition High rHDPE can be used for fenders.
{"title":"Study of Characteristic of Used Tire, Asphalt, and RHDPE Powder Composites as Car Fender Material","authors":"Anwar Nurharyanto, Wachid Yahya","doi":"10.31328/jsae.v7i1.5233","DOIUrl":"https://doi.org/10.31328/jsae.v7i1.5233","url":null,"abstract":"This research aims to determine the effect of composition on used tire powder composites, asphalt, and recycled plastic (rHDPE), on tensile stress. The composite is expected Can be used for fenders on cars. The composition variations in this study were 500 grams of used tire powder, and 100 grams of asphalt, with variations of rHDPE 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 200, 250, 300, 350, 400 grams. From the tensile test results, the lowest tensile stress was obtained 0.0233 N/mm2 is owned by a composite with a composition of 40-gram rHDPE. For tensile stress. The highest was a composite with a composition of 400-gram rHDPE with a tensile stress value of 0.855 N/ mm2. The tensile test results of factory-made car fenders have a tensile stress of 0.852 N/mm2. From this research, it can be concluded that composites with composition High rHDPE can be used for fenders.","PeriodicalId":513206,"journal":{"name":"JOURNAL OF SCIENCE AND APPLIED ENGINEERING","volume":"10 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141704020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. R. Ismail, P. Suwandono, D. Hermawan, Akhmad Farid, Frida Dwi Anggraeni
The potential of energy and sea water in Indonesia is relatively high, but it has not been utilized massively to reduce the shortage of fresh water on the islands. Utilization of this potential can use solar stills. Solar still is a relatively cheap technology, easy to obtain materials, environmentally friendly and easy to construct, but this technology has shortcomings in its low productivity. Efforts to increase productivity have been made by many researchers, but there has not been a study of internal reflector integration in a double slope solar still using a porous absorbent plate tested for 23 hours. This study aims to examine the effect of adding an internal reflector on the performance of a double slope solar still. The performance of the double slope solar still is identified by evaluating freshwater productivity and efficiency. This research was conducted experimentally comparing with and without internal reflector. The addition of internal reflectors varies in placement, as for the placement on the north and south sides (RUS), the south side (RS), and the north side (RU). Data collection starts at 07.00 p.m. until 06.00 a.m the next day and is carried out for 5 days. Research comparing the performance of RUS, RS, RU compared to TR and concluded that there is an increase in temperature of fins, seawater and cover glass when using the addition of internal reflector. The increase in temperature has an effect on daily productivity for RUS, RS and RU between 12.88-16.13%, 8.71-12.56%, and 1.70-2.88%, respectively. In addition, the addition of the internal reflector has a positive effect on increasing the daily efficiency for RUS, RS and RU between 12.69-15.93%, 8.60-12.46% and 1.65-2.82%, respectively.
{"title":"Effect of Internal Reflectors on Daily Performance of Double Slope Solar Stills with Porous Fin Absorber Plate","authors":"N. R. Ismail, P. Suwandono, D. Hermawan, Akhmad Farid, Frida Dwi Anggraeni","doi":"10.31328/jsae.v7i1.5981","DOIUrl":"https://doi.org/10.31328/jsae.v7i1.5981","url":null,"abstract":"The potential of energy and sea water in Indonesia is relatively high, but it has not been utilized massively to reduce the shortage of fresh water on the islands. Utilization of this potential can use solar stills. Solar still is a relatively cheap technology, easy to obtain materials, environmentally friendly and easy to construct, but this technology has shortcomings in its low productivity. Efforts to increase productivity have been made by many researchers, but there has not been a study of internal reflector integration in a double slope solar still using a porous absorbent plate tested for 23 hours. This study aims to examine the effect of adding an internal reflector on the performance of a double slope solar still. The performance of the double slope solar still is identified by evaluating freshwater productivity and efficiency. This research was conducted experimentally comparing with and without internal reflector. The addition of internal reflectors varies in placement, as for the placement on the north and south sides (RUS), the south side (RS), and the north side (RU). Data collection starts at 07.00 p.m. until 06.00 a.m the next day and is carried out for 5 days. Research comparing the performance of RUS, RS, RU compared to TR and concluded that there is an increase in temperature of fins, seawater and cover glass when using the addition of internal reflector. The increase in temperature has an effect on daily productivity for RUS, RS and RU between 12.88-16.13%, 8.71-12.56%, and 1.70-2.88%, respectively. In addition, the addition of the internal reflector has a positive effect on increasing the daily efficiency for RUS, RS and RU between 12.69-15.93%, 8.60-12.46% and 1.65-2.82%, respectively.","PeriodicalId":513206,"journal":{"name":"JOURNAL OF SCIENCE AND APPLIED ENGINEERING","volume":"68 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141691028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This research aims to explore the phenomenon of content commodification in the digital age, focusing on the economic, social, and cultural implications and challenges faced by content creators and digital platforms. Offers an original contribution to understanding how content commodification impacts various aspects of digital life. By highlighting key implications and challenges, it provides useful insights for content creators, platform managers, and policymakers. A qualitative approach was used in this research, involving in-depth interviews with content creators and policy analysis of digital platforms. Data was also obtained through a review of current literature from the last five years to support the research findings. Research limitations include limitations in sample size and diversity, time constraints, and participant and researcher bias. These limitations affect the generalizability of the results and highlight the need for further research with a wider scope and more diverse methods. The results show that content commodification provides significant economic opportunities for content creators, but also brings challenges such as income instability, copyright issues, and pressure to create viral content. Digital platform algorithms affect the visibility and sustainability of content. Social and cultural implications include changes in consumption patterns and social interactions, as well as cultural diversification influenced by platform algorithms. This research concludes that overcoming the challenges of content commodification requires diversifying sources of income, increasing copyright awareness, and developing fairer algorithms. Cooperation between creators, digital platforms, and policy makers is essential to create a more equitable and sustainable ecosystem in the creative industry and digital economy.
{"title":"Content Commodification in the Digital Age : Implications and Challenges","authors":"Erri Kartika Purnama Putri, Zulaikha Zulaikha, Dhimam Abror, Nur Annafi Farni Syam Maella","doi":"10.31328/jsae.v7i1.6119","DOIUrl":"https://doi.org/10.31328/jsae.v7i1.6119","url":null,"abstract":"This research aims to explore the phenomenon of content commodification in the digital age, focusing on the economic, social, and cultural implications and challenges faced by content creators and digital platforms. Offers an original contribution to understanding how content commodification impacts various aspects of digital life. By highlighting key implications and challenges, it provides useful insights for content creators, platform managers, and policymakers. A qualitative approach was used in this research, involving in-depth interviews with content creators and policy analysis of digital platforms. Data was also obtained through a review of current literature from the last five years to support the research findings. Research limitations include limitations in sample size and diversity, time constraints, and participant and researcher bias. These limitations affect the generalizability of the results and highlight the need for further research with a wider scope and more diverse methods. The results show that content commodification provides significant economic opportunities for content creators, but also brings challenges such as income instability, copyright issues, and pressure to create viral content. Digital platform algorithms affect the visibility and sustainability of content. Social and cultural implications include changes in consumption patterns and social interactions, as well as cultural diversification influenced by platform algorithms. This research concludes that overcoming the challenges of content commodification requires diversifying sources of income, increasing copyright awareness, and developing fairer algorithms. Cooperation between creators, digital platforms, and policy makers is essential to create a more equitable and sustainable ecosystem in the creative industry and digital economy.","PeriodicalId":513206,"journal":{"name":"JOURNAL OF SCIENCE AND APPLIED ENGINEERING","volume":"6 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141711787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. A. Winoko, Supa Kusuma Aji, Agus Setiawan, Intan Fadillah
One way to improve the performance of gasoline engines is by using bioethanol, which can enhance combustion efficiency. Bioethanol, a renewable fuel derived from the fermentation of plant materials, can be blended with traditional fossil fuels to create a more efficient and environmentally friendly fuel alternative. The combination of fossil fuel and fermentation-derived fuel has a significant impact on the overall performance and emissions of the engine. The aim of this study is to determine the magnitude of changes in torque and power when a gasoline engine is fueled with a mixture of corn cob bioethanol and pertamax. Additionally, specific fuel consumption will be determined to evaluate the fuel efficiency. The engine used in this study is a 150cc gasoline motor, a common size for motorcycles and small vehicles. The testing variables include engine speed variations from 2000 to 9500 rpm using bioethanol blends of 5%, 10%, and 15% with 92 octane fuel. The data collected from these tests is calculated mathematically. The results of the study show the largest increase in power at 0.45 horsepower at 2500 rpm and torque at 2.82 Nm at 2500 rpm when using the BE15% fuel blend, indicating a notable enhancement in engine performance with higher bioethanol content. Furthermore, the smallest decrease in fuel consumption was recorded at 0.1739 kg per horsepower, highlighting the efficiency benefits of bioethanol blends. Overall, the engine performance improves when using a blend of 92 octane fuel with bioethanol compared to pure 92 octane fuel. This suggests that incorporating bioethanol into gasoline can not only improve power and torque but also enhance fuel efficiency, making it a viable option for reducing dependency on fossil fuels and lowering emissions.
{"title":"Analysis of the Percentage of Corn Cob Bioethanol Volume with 92 Octane Fuel in Gasoline Engines","authors":"Y. A. Winoko, Supa Kusuma Aji, Agus Setiawan, Intan Fadillah","doi":"10.31328/jsae.v7i1.5466","DOIUrl":"https://doi.org/10.31328/jsae.v7i1.5466","url":null,"abstract":"One way to improve the performance of gasoline engines is by using bioethanol, which can enhance combustion efficiency. Bioethanol, a renewable fuel derived from the fermentation of plant materials, can be blended with traditional fossil fuels to create a more efficient and environmentally friendly fuel alternative. The combination of fossil fuel and fermentation-derived fuel has a significant impact on the overall performance and emissions of the engine. The aim of this study is to determine the magnitude of changes in torque and power when a gasoline engine is fueled with a mixture of corn cob bioethanol and pertamax. Additionally, specific fuel consumption will be determined to evaluate the fuel efficiency. The engine used in this study is a 150cc gasoline motor, a common size for motorcycles and small vehicles. The testing variables include engine speed variations from 2000 to 9500 rpm using bioethanol blends of 5%, 10%, and 15% with 92 octane fuel. The data collected from these tests is calculated mathematically. The results of the study show the largest increase in power at 0.45 horsepower at 2500 rpm and torque at 2.82 Nm at 2500 rpm when using the BE15% fuel blend, indicating a notable enhancement in engine performance with higher bioethanol content. Furthermore, the smallest decrease in fuel consumption was recorded at 0.1739 kg per horsepower, highlighting the efficiency benefits of bioethanol blends. Overall, the engine performance improves when using a blend of 92 octane fuel with bioethanol compared to pure 92 octane fuel. This suggests that incorporating bioethanol into gasoline can not only improve power and torque but also enhance fuel efficiency, making it a viable option for reducing dependency on fossil fuels and lowering emissions.","PeriodicalId":513206,"journal":{"name":"JOURNAL OF SCIENCE AND APPLIED ENGINEERING","volume":"2011 29","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141706820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hangga Wicaksono, Kris Witono, A. Faizin, Budi Eko Prasetyo
The selection of the appropriate blade shape requires optimization in order to be applied to the relatively low wind conditions in Indonesia. This study proposed a new approach of wind turbine blades design by utilizing the combination of NACA 4415 and FX 60. The effect of twist angle and the chord length carried out in this study to better understanding the blades characteristics. The 6 DoF analysis can be used to determines the theoretical mechanical power of the wind turbine blades. The blade twist geometry analyzed in this study is 15, 20, and 25 degree. From the simulation results, the highest mechanical power was obtained on blades with a twist angle of 5 degrees and a chord length of 0.15m with an average value of 39.95 W. The simulation results show that, at a speed of 8 m/s the blade with a chord length of 0.2 m and a twist angle of 5o has the greatest torque of 5.16579 Nm, with a rotational speed of 76.0668 rpm per minute, this combination can be applied to a low rpm generator A twist angle can improve torque distribution along the blade, but a twist angle that is too sharp can reduce lift and increase drag. It was found that a wider chord length tends to produce lower rotation in the wind turbine. This is caused by the increased surface area on the turbine blade with a longer chord length, which results in an increase in the torque required to rotate the blade at a given speed.
{"title":"Numerical Study of Chord Length and Twist angle Effect towards NACA 4415-FX60 Airfoil Combination in Horizontal Wind Turbines Application","authors":"Hangga Wicaksono, Kris Witono, A. Faizin, Budi Eko Prasetyo","doi":"10.31328/jsae.v7i1.5868","DOIUrl":"https://doi.org/10.31328/jsae.v7i1.5868","url":null,"abstract":"The selection of the appropriate blade shape requires optimization in order to be applied to the relatively low wind conditions in Indonesia. This study proposed a new approach of wind turbine blades design by utilizing the combination of NACA 4415 and FX 60. The effect of twist angle and the chord length carried out in this study to better understanding the blades characteristics. The 6 DoF analysis can be used to determines the theoretical mechanical power of the wind turbine blades. The blade twist geometry analyzed in this study is 15, 20, and 25 degree. From the simulation results, the highest mechanical power was obtained on blades with a twist angle of 5 degrees and a chord length of 0.15m with an average value of 39.95 W. The simulation results show that, at a speed of 8 m/s the blade with a chord length of 0.2 m and a twist angle of 5o has the greatest torque of 5.16579 Nm, with a rotational speed of 76.0668 rpm per minute, this combination can be applied to a low rpm generator A twist angle can improve torque distribution along the blade, but a twist angle that is too sharp can reduce lift and increase drag. It was found that a wider chord length tends to produce lower rotation in the wind turbine. This is caused by the increased surface area on the turbine blade with a longer chord length, which results in an increase in the torque required to rotate the blade at a given speed.","PeriodicalId":513206,"journal":{"name":"JOURNAL OF SCIENCE AND APPLIED ENGINEERING","volume":"42 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141709642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ilham Wahyudi, Diky Siswanto, Mohamad Mukhsim, Sabar Setyawidayat
The Internet of Things (IoT) connects devices to the Internet, allowing them to communicate with consumers. Embedded computer systems, sensors, and actuators are all part of it. Some IoT applications, such as Tugu Tirta Malang, have had a significant impact on water distribution. Choosing the right power supply can provide more effective real-time results in collecting and exchanging data. As in previous research on the use of solar cells for power supply, IoT devices can produce sensor reading systems with constant and accurate time delays. Some previous research on the selection of solar cells as the power supply of IoT devices and the application of the IoT device in the field of water distribution in Tugu Tirta to provide ease and speed to collect water pressure data. According to a survey, IoT devices do not yet have an independent power source, so IoT devices may lose power during a power outage at Tugu Tirta Kota Malang main power source. The results of a solar cell-based power source for a water pressure monitoring system at Tugu Tirta Malang are presented in this research. The results demonstrate that the solar panel power system as the main power plant may be accomplished utilizing the specifications of one 50 WP solar panel and one 20 Ah battery. Perum Bukit Dieng Critical Point may be monitored 24 hours a day, seven days a week utilizing a 20 Ah battery and a 50 WP solar panel. The solar power system can power the monitoring system for 24 hours with an average output power each day of 7.93 Watts, with 3.96 Watts entering the surveillance system and 4.04 Watts going into the battery.
{"title":"Solar Power System for Water Pressure Monitoring System at Perumda Tugu Tirta Kota Malang","authors":"Ilham Wahyudi, Diky Siswanto, Mohamad Mukhsim, Sabar Setyawidayat","doi":"10.31328/jsae.v7i1.5062","DOIUrl":"https://doi.org/10.31328/jsae.v7i1.5062","url":null,"abstract":"The Internet of Things (IoT) connects devices to the Internet, allowing them to communicate with consumers. Embedded computer systems, sensors, and actuators are all part of it. Some IoT applications, such as Tugu Tirta Malang, have had a significant impact on water distribution. Choosing the right power supply can provide more effective real-time results in collecting and exchanging data. As in previous research on the use of solar cells for power supply, IoT devices can produce sensor reading systems with constant and accurate time delays. Some previous research on the selection of solar cells as the power supply of IoT devices and the application of the IoT device in the field of water distribution in Tugu Tirta to provide ease and speed to collect water pressure data. According to a survey, IoT devices do not yet have an independent power source, so IoT devices may lose power during a power outage at Tugu Tirta Kota Malang main power source. The results of a solar cell-based power source for a water pressure monitoring system at Tugu Tirta Malang are presented in this research. The results demonstrate that the solar panel power system as the main power plant may be accomplished utilizing the specifications of one 50 WP solar panel and one 20 Ah battery. Perum Bukit Dieng Critical Point may be monitored 24 hours a day, seven days a week utilizing a 20 Ah battery and a 50 WP solar panel. The solar power system can power the monitoring system for 24 hours with an average output power each day of 7.93 Watts, with 3.96 Watts entering the surveillance system and 4.04 Watts going into the battery.","PeriodicalId":513206,"journal":{"name":"JOURNAL OF SCIENCE AND APPLIED ENGINEERING","volume":"15 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141702922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：