bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Innovation and Application of Thermoplastic Polyurethane Elastomer Bionic Leather Fabric from the Perspective of Sustainable Design
Authors: Wang Yang , Li Xiuwei , Chen Youfang
Published: March 2021

With the improvement of consumers’ awareness of environmental protection and the continuous improvement of consumer demand, the leather industry is developing in the direction of environmental sustainability and functional diversity. This article takes thermoplastic polyurethane elastomer yarn as the research object. From the perspective of sustainable design, the woven process is used to weave the thermoplastic polyurethane elastomer yarn and the traditional yarn, and the new fabric obtained after weaving is tested and analyzed. Analyzing and discussing the results of multiple experiments, and expounding the functions and characteristics of the new fabric, weaving a new type of leather fabric that is different from traditional leather-thermoplastic polyurethane bionic leather fabric. The fabric has better gloss, water resistance, abrasion resistance and leather texture, and also has a bionic texture that traditional leather does not have. The research results of this article verify the innovative ideas and design directions in the process, provide more possibilities for the design and development of future luggage products, and make the design of luggage products more diverse.
Experimental Research on Compressive Performance of Modified Rammed Soil Based on Highland Barley Straw Fibers and Rubbles
Authors: Li Hanghang , Li Hui , Jiang Ningshan , Zhang Wuyu , Zhao Guozhi
Published: March 2021

In order to find a green, low-cost and high-performance modified raw soil method, samples were made from highland barley straw and gravel, which are unique in Qinghai-Tibet Plateau. The failure phenomenon, compressive strength, deformation capacity and load-displacement curve of different samples were studied, and the action mechanism and influence law of compressive strength of modified soil with different admixtures were analyzed and discussed. The test results show that when 0.25% highland barley straw and 20% gravel are mixed, the specimen has a smooth surface without dry shrinkage cracks, and its compressive strength and deformability are increased by 2.1 times and 30% respectively compared with that of plain soil. This content can be used as the best mixture ratio of this modified raw soil method.
Characteristics of lactic acid bacteria and acetic acid bacteria isolated before and after fermentation of cacao beans from Pidie, Indonesia and detection of the flavour compounds
Authors: Yunita D , Yusriana Y , Aisyah Y , Indarti E , Wahyuni M F , Yani P
Published: March 2021

The objectives of this research were to characterise lactic acid bacteria (LAB) and acetic acid bacteria (AAB) which were isolated before and after fermentation of cacao beans, and to detect the flavor compounds in each of these steps. Samples were collected from a farmer in the Pidie District, Aceh Province, Indonesia who supplies the fermented cacao beans for a local chocolate factory located in Pidie Jaya District. The samples were collected before fermentation (F0) and after 5 days fermentation (F5) steps in duplicate. Five LAB and nine AAB were characterised for colony and cell morphology, catalase and oxidase tests, and growth resistance at low pH. The qualitative analysis of flavor compounds of the cacao beans were identified by Gas Chromatography Mass Spectrometry Solid Phase Microextraction (SPME-GCMS). The results showed that all isolates have a negative result on oxidase tests and only one AAB isolate could grow at pH 3. The reduction of phenethylamine during fermentation is desired because it gives off a fishy odor as a result of decarboxylation of amino acids by lactic acid bacteria. The detection of 3-octanyl acetate by its sweet floral fruity odor is expected. It is also interesting to note that a nutty taste and earthy aroma were detected indicating that trimethyl pyrazine and dimethyl pyrazine were present after fermentation even though they were not a major compound.
Lactococcus lactis and Lactococcus garvieae identified from Aceh buffalo (Bubalus bubalis) associated lactic acid bacterial isolates
Authors: Suhartono S , Misrahanum M , Yulvizar C , Khairami I R
Published: March 2021

Lactic acid bacteria (LAB) are one of the beneficial bacterial groups due to their metabolic activities, including production of bacteriocin that are potentially applied as biopreservation. The objectives of the study were to identify LAB isolate coded as BK-03 using biochemical and molecular approach as well as to determine the potency of the isolate in producing bacteriocin. The isolate of BK-03 recovered from the meat of Aceh indigenous buffalo was subjected to biochemical and molecular identification. Based on biochemical identification using the API 50 CHL, the LAB isolate of BK-03 was identified as Lactococcus lactis ssp lactis 1 with 98.6% proximity percentage. However, different results were obtained from molecular approach using 16S rRNA, as the isolate was identified as Lactococcus garvieae with a a similarity index of 99%. The results of the antimicrobial assay showed that the crude extracts of BK-03 bacteriocin did not show an inhibition zone to Escherichia coli, but had an inhibitory zone against Staphylococcus aureus with a average diameter of 7.45 mm.
Water quality characteristics and modeling of Tasik Aman, USM, Penang
Authors: Munirah Z M , Muhammad Izzat Emir K B , Wan Maznah W O , Teh S Y , Ismail A H , Eshak M B
Published: March 2021

Tasik Aman was constructed in 1990 as a flood retention pond in the Universiti Sains Malaysia, Main Campus, Penang, Malaysia. Tasik Aman has been experiencing accumulation of excess nutrients from the surrounding area mainly from Sungai Gambir, causing high algae population in the water body. Thus, a study was carried out in December 2019, focusing on the current water quality determination of Tasik Aman, to predict the future water quality condition of the lake. Four sites were designated to conduct water quality analysis comprising of water temperature, dissolved oxygen (DO), pH, transparency, biological oxygen demand (BOD), total dissolved solids, total suspended solids, conductivity, orthophosphate, chlorophyll-a, total phosphorus, ammonia, nitrite, and nitrate. Some physico-chemical parameters were measured in-situ while some were measured in the lab by analyzing the water samples collected in the field in accordance with APHA (2005). DO and BOD data were modeled using Water Quality Analysis Simulation Program (WASP). Tasik Aman showed high readings in temperature, TSS, TDS, conductivity, DO, BOD, chlorophyll-a, and nitrate-nitrogen. One-way ANOVA further revealed significant differences of DO, TDS, conductivity, transparency, orthophosphate, nitrate, and chlorophyll-a among the stations of Tasik Aman (p<0.05). Based on WASP analysis, simulated graphs produced for Tasik Aman showed a decrease in DO and an increase in BOD level proving that the lake contain high nutrient content that may exacerbate the eutrophication.
Effect of different nitrogen sources on cell growth and biochemical compositions of Chlorococcum sp. cultivated under laboratory conditions
Authors: Fatini M A , Basri E M , Wan Maznah W O
Published: March 2021

Different sources of nitrogen can affect the growth and biochemical composition of microalgae. The present study was conducted to determine the effect of different nitrogen sources on algal growth, carbohydrate and protein contents, of freshwater microalgae Chlorococcum sp. Three different nitrogen sources were used in this study including sodium nitrate, ammonium chloride and urea. The cultivation of the algae of different nitrogen sources took place in the same parameter conditions (24 hours of light duration; 25 ± 1 °C of temperature; 7.20 ± 0.02 of pH). The algal cells were harvested at the early stationary phase for biochemical analysis. The number of cells were quantified by using a counting chamber (haemocytometer) and growth curves were plotted to determine the growth rate. The results revealed that Chlorococcum sp. cultivated in urea as the nitrogen source exhibited the highest growth rate. Apart from that, it was also found that the cells cultivated in urea displayed the highest carbohydrate and protein content as compared to the other two nitrogen sources which were 25.5% and 18.7%, respectively. Moreover, the cells cultivated in urea were medium in size during early stationary phase indicating urea the best nitrogen source for Chlorococcum sp. under controlled conditions.
The diversity of echinoderms in the seagrass meadows of Penang Island, Malaysia
Authors: Teoh V Y J , Woo S P
Published: March 2021

Many studies had been done on the diversity of echinoderms in Malaysia, especially on holothuroids, but only a handful was conducted on seagrass meadows. The lack of studies conducted on echinoderms in seagrass meadows coupled with the steadily declining area of seagrass meadows represents a serious threat to the documentation of Malaysia’s echinoderm biodiversity. This study was conducted to provide a checklist of echinoderms found in the seagrass meadows of Penang Island. Four sampling trips were conducted from October 2019 to February 2020 and specimens were collected by hand during low tide in two sites, Pulau Gazumbo and Middle Bank. Additional specimens in the collection of Centre for Marine and Coastal Studies, Universiti Sains Malaysia (CEMACS, USM) were also included in this study. Ossicles of holothuroids were extracted, observed under a light microscope, and illustrated. A total of 31 specimens were examined and identified, comprised of 15 species: one from the class Asteroidea; seven from the class Ophiuroidea; two from the class Echinoidea; and five from the class Holothuroidea. The results would be able to serve as a basis for future studies on the taxonomy, diversity, and distribution of echinoderms in the seagrass meadows of Malaysia.
The detoxification enzymes activity profile in susceptible Aedes and Culex mosquitoes
Authors: Farouk S A , Barahim N , Hamzah S N
Published: March 2021

The status of susceptible mosquito is important for monitoring and managing insecticide resistance in field population. The purpose of this study is to profile the differential expression level of enzymatic activities of metabolic enzymes exhibited in the mosquito species of Aedes aegypti, Aedes albopictus, and Culex quinquefasciatus from the susceptible strain. The fourth instar larvae of each strain were subjected to biochemical assay. The total protein content and enzymatic activities of Glutathione S-transferase (GST), α-esterase (α-est), β-esterase (β-est) Cytochrome P450 (Cyt P450) and Acetylcholinesterase (AChE) from each mosquito strains were elucidated. Significant difference (P<0.05) was detected between the total protein content between all species of susceptible strain mosquitoes. One-way ANOVA showed that the specific enzymatic activities of GST, α-est and Cyt P450 of all test mosquitoes were significantly different upon comparison with each species (P<0.05). The mean of enzymatic activities of insensitive AChE showed no significant difference upon comparison with each other (P>0.05). The enzymatic activities of β-est shows no significant difference between Ae. aegypti and Cx. quinquefasciatus mosquitoes (P>0.05) but the enzymatic activity of β-est in Ae. albopictus manifested significant difference upon comparison with the enzymatic activities of the other two test species (P<0.05). The results obtained may provide more information about the enzymatic activities of metabolic enzymes in Ae. aegypti, Ae. albopictus and Cx. quinquefasciatus mosquitoes which might be beneficial for public sector for the application of proper vector control measures.
Potato tuber (Solanum tuberosum L.) formation due to the application of different concentrations of coconut water in in-vitro
Authors: Sembiring R , Hayati M , Kesumawti E
Published: March 2021

This study apply coconut water to support the process of formation of potato tubers in vitro. The study was conducted at the laboratory of tissue culture, Experimental Garden of Vegetable Research Center, Berastagi, North Sumatera. The experiment used Completely Randomized Design with single treatment factor, the coconut water concentration of 0; 75; 150 and 225 ml L−1. The results show that the application of coconut water provides a significant effect on the number, diameter and fresh weight of potato micro tubers, but the effect is not significant at the time of potato micro tuber formation. The application concentration of coconut water 225 mL L−1 affected the potato micro tuber formation in in vitro.
Characterization of mechanical properties polypropylene composites film filled with corncob as reinforcement
Authors: Gunawan A , Pasaribu H , Lauzia T , Syamsuddin Y , Meiriza L , Kamaruzaman S , Aprilia S
Published: March 2021

The use of materials in cars has changed significantly over the last few decades. Polypropylene is the top choice for automotive industry players because it has unparalleled flexibility, affordable cost and performance balance that successfully replace steel and other plastics as the material for the manufacture of motor vehicles. However, since the raw material of polypropylene is derived entirely from petroleum and natural gas which can be discharged at any time. Also, its use is not environmentally friendly which need an action to overcome one of them by developing composite technology. The purpose of this study was to know the relation of mass fraction of corncob fiber into polypropylene composites on tensile strength and composite morphology. Corncobs reinforce in polypropylene are 10, 20, 30 and 40% by weight. XRD analysis investigated at 2θ the crystalline part of corncob at 21°. The functional group of Si-OH and Si-O-Si were analyzed at wavelength 1030 and 1100 cm−1. The fracture surface of composite shows the crack effect of particle loading. Polypropylene composites filled with corncob increased in tensile strength and decrease in elongation at break with the increase of corncob particle loading.
The potential of Trichoderma species to remediate silver nanoparticles contamination
Authors: Oktarina H , Artika W , Mukhriza T
Published: March 2021

Trichoderma is one of soil fungi that has been widely explored for the removal and recovery of heavy metals. A preliminary experiment was set to investigate the potential of two local species of Trichoderma, T. harzianum and T. virens, to remediate silver nanoparticles (AgNPs) contamination. AgNPs was studied as they have the most commercial applications as consumer products and accumulated in soil. Four levels of AgNPs (0, 100,200,300 mg L−1) were used to examine the ability of each species to grow in contaminated media. The growth of Trichoderma spp. was observed by measuring the colony diameter and spore production. The results showed that T. harzianum was more sensitive to AgNPs than T. virens as the colony diameter and spore production reduced significantly. The study indicates that T. virens has a potential to remediate AgNPs contamination.
The effect of yeast and lactic acid bacteria as probiotic on the total of Vibrio spp. in rearing water of post larvae tiger shrimp (Penaeus monodon)
Authors: Nurliana  , Sutriana A , Azhar A , Erina  , Jalaluddin M , Andista B K
Published: March 2021

Probiotics are an alternative that can be used to prevent the incidence of vibriosis in the cultivation of tiger shrimp (Penaeus monodon). Yeast can be used as a probiotic and immunostimulant because it can increase the total of beneficial microbes. Lactic Acid Bacteria (LAB) are chosen to be developed as a probiotic because it is able to produce organic acids, hydrogen peroxide and bacteriocin which act as antagonistic agent to Vibrio spp. This study aimed to determine the effect of RABAL probiotics on the total Vibrio spp. in medium of post larvae tiger shrimp (Penaeus monodon). The study was conducted with an experimental method using a completely randomized design (CRD) with 4 treatment groups and 3 repetitions. Calculate of the total amount of Vibrio spp. and LAB on rearing water was carried out using Total Plate Total (TPC) method. Based on the results of the study, it was found that administering RABAL probiotics with a dose range of 2,5 to 7,6 ml / L was proven to reduce the amount of Vibrio spp. in rearing water of post larvae tiger shrimp (Penaeus monodon).
Reinforcement method of reinforced concrete beam by using non-stressing strand
Authors: Susanto A , Kasyanto H , Susilahadi S
Published: March 2021

Many methods can be used in the repair of bridges or other structural buildings. The aim is to increase the existing capacity. In the reinforced concrete beam structure, capacity of structural elements can be carried out by reinforcement method. The research was done by experimental loading test in laboratory. The test objects are consisted of 2 (two) reinforced concrete beams: a normal beam without reinforcement (NB) and a reinforcement beam by using non-stressing srand (RB1). The dimensions of the beams are 150mm x 300mm x 3200 mm. All beams are loaded by static-monotonic load until collapses. From the results of the research, the first yield load for the NB beam and RB1 beam respectively are 22 kN and 29kN. The deformations that occur at the conditions are 9.5mm and 14mm respectively. The collapse occurring on the NB beam is the bending collapse, whereas in the RB1 beam is a bending- shear collapse.
Performance improvement of Asphalt Concrete-Wearing Course with modification of masterbatch SIR20
Authors: Yulianti N P , Sulaiman S , Utami R
Published: March 2021

Asphalt Concrete-Wearing Course is a layer that is located at the top of flexible pavement structure. Types of damage that often occur in the AC-WC layer are rutting and slippery. AC-WC modification with masterbatch SIR20 is a system that improves AC-WC performance in reducing deformation in pavement structure and improving crack and skid resistance. The method that is used in this study is an experimental method that compares and analyzes the performance of the modified AC-WC layer with variations of masterbatch content are 2%, 4%, 6% and 8% and 0% as a control. The 4% of masterbatch content in the AC-WC modification layer is an effective and efficient option to be applied as a surface layer of a pavement structure.
Prediction of sediments discharge in watershed with two tank models
Authors: Mulyono T , Jumi J , Azizah A
Published: March 2021

Uncontrolled erosion would cause considerable damages, such as soil fertility decline, water structures damage and reservoirs sedimentation. As the data for the sedimentation rate are limited, several models have been developed to predict the surface erosion and the rate of sedimentation. However, the availability of sufficient, diverse and extensive data is needed for the implementation of the models, both for the model calibration and the verification. The result of the analysis shows that both of the Water Tank Models that represent the erosion-sedimentation rate process, in which Water Tank 1 being the three-tank cascade system and Water Tank 2 being two-tank cascade system, are not optimum. This can be observed from the values of volume error (VE), relative error (RE), root-mean-square error (RMSE) and correlation coefficient (R) that show the effect of 1.5 hours of rain period in the sedimentation rate. The field condition shows considerable sedimentation, on the other hand, the models’ simulations show decreasing sedimentation rates. The optimum model’s parameters for Water Tank 1 and Water Tank 2 are 924.51%-1049.26% for the relative error, 50.81% - 121.42% for the volume error, 0.9 for the correlation coefficient and 6703.59-17,297.85 for the root-mean-square error. The parameters and constant’s values of the models are different relative to the drainage basins’ condition.
VeRO: Smart home assistant for blind with voice recognition
Authors: Triyono L , Yudantoro T R , Sukamto S , Hestinigsih I
Published: March 2021

In daily life, people with visual impairment have difficulty in their activities, especially at home activities. People with visual impairment as of 2017 reached 1.5 percent or around 3.75 million people from the population of Indonesia and more than 253 million people worldwide. The number of blind people who are not small need help to get a good quality of life and independent. Friendly home design for the blind is not yet available specifically. It is a particular difficulty for blind people to access the latest electronic goods or information (news). Then this becomes the basis of this research on how to provide easy access for blind people. This research provides a solution that is designing a prototype of a house that is visually impaired in addition to the use of electronic equipment. This system starts from the microphone as a sensor in charge of picking up sound and then the results are processed by Android and then connected to NodeMCU via Wi-Fi. The microphone used is the default microphone of the Android smart phone. By using the speech recognition method, the command is enough to say the keywords, Android will manage the sound into a code that will be sent to the microcontroller to perform the task. There are several categories of commands that can be handled, including (a) Turning on / off electronic devices, (b) Providing news information from popular news web portals, (c) Entertainment by playing streaming radio and (d) General information on hours and dates. All planned functions are running properly, there are some features that might be developed further. Adding sensitivity to starting voice commands and adding the ability to read long stories can be further research.
Online monitoring system for emergency diabetes mellitus patients
Authors: Kurniawati R , Suryono S , Ismail S
Published: March 2021

In this research, an online monitoring system was designed to detect emergency due to uncontrolled blood glucose fluctuations in patients with diabetes mellitus. Hyperglycemia in the morning causes dawn phenomenon and Somogyi effect. This incident is very fast, and its uncontrollable time of occurrence can inflict a fatal condition causing death. Unfortunately, there are no systems able to detect such events, currently. This study proposes an online monitoring system with the input of the patient’s blood glucose measurement into the smartphone. Blood glucose values are sent and stored in the webserver, and the results are used to determine the incidence of dawn phenomenon and the Somogyi effect. The study was able to produce an online monitoring system which can be monitored by nurses, doctors, and administrators via the dashboard.
Survey of smart parking application deployment
Authors: Nugraha D , Ahmed F Y H , Abdullah M I , Johar M G M
Published: March 2021

Number of vehicles continues to increase in the urban place parallel with the infrastructure advancement. The increase of vehicles on road causes various problems and obstacles to find an empty parking slot. This problem often causes congestion, waste more effort and time-consuming process especially during rush hours when many people are driving for various reasons. In this paper, we explore the concept of smart parking based on the application of their categories and explain the classification from various parking support technologies. Present developed parking system supported by various technologies and the category. Classified the application function of this survey. The application of this smart parking application might assist in reducing congestion and other issue by manage the parking process. Achieve the key objective of this research as stated by various scientist and researcher to deliver an advanced parking system. Conducted by developing an application interface base on a mobile, desktop and web. It is an excellent determination for the parking management to deliver a real-time information update on the parking area, which is the point of interest as an improvement to the existing system and research.
QoS analysis of WSN (Wireless Sensor Network) using node MCU and accelerometer sensors on bridge monitoring systems
Authors: Junesco D , Supriyanto E , Hasan A , Mukhlisin M
Published: March 2021

Based on the planning guideline of Health Monitoring System of Bridge Structure of Kementrian Pekerjaan Umum dan Perumahan Rakyat, one of the main components needed in bridge health monitoring system is a communication system. The application of the WSN (Wireless Sensor Network) function to perform monitoring can be used to create a more practical system. Based on the system, required hardware that can be integrated with the software and can connect on wireless. Proposed methods using WSN (Wireless Sensor Network) on devices, then do testing on connectivity to obtain network quality and data sensor. Data sensor will be uploaded on the cloud can be accessed from various places that connected to the Internet network thus forming an IoT (Internet of Things) based system with using Message Queue Telemetry Transport (MQTT) protocol. Experiments carried out in two ways of connectivity, point-to-point and star topology to determine the network quality of each device, which is Node MCU and Mi-Fi modems. Network quality parameters can be known by looking at the value of packet loss, delay, jitter, and throughput. In the results, the MQTT Protocol applied to build IoT system. In addition, proposed methods that used in this research has a great quality network with packet loss <25 ms. However, there’s a big gap between serial data and online data that makes MQTT protocol is not suitable for monitoring systems that require fast data transfer.
Double security system with RFID and password based on Arduino Mega 2560 and PLC
Authors: Syahid S , Supriyatna S , Badruzzaman Y , Antono D , Santoso A
Published: March 2021

This research focuses on the use of RFID (Radio Frequency Identification) systems that are used as personal identification cards in the room access system. This system is intended to maintain the security and privacy of the room from someone who does not have the authority to enter the room. This security system uses a two-tier security system, namely through an RFID identity card and security code. The design and implementation of this system, an electric key work system is evaluated based on the solenoid component and the password used when accessing the room. RFID tags used in this system are in the form of “Mifare RFID Card 13.56 Mhz” cards and store unique codes used as personal identification. This code is read by the RFID reader in validating its authority with Arduino Mega 2560 to regulate the system of electric locks and passwords used to open the door. From the test results, 100% RFID tags can be recognized by the RFID reader, 100% RFID tag and password reading system is successfully used to access the room.
Power saving of IP over WDM: Coherent taxonomy, mechanism and technique: A review
Authors: Pratama L P , Saud S N , Wardihani E D , Lehat N M
Published: March 2021

In this survey, the comparison of highlights on the importance of energy saving in IP over WDM (IPoWDM) is presented and followed by the review on the existing related article by using systematically data review based inclusion and exclusion criteria. The adaptive clock frequency, sleeping mode, and hybrid grooming mechanism protection is the latest breakthrough in the IPoWDM mechanism. The researcher identifies trend of survivability is divided into three protections: link scheme, path protection and restoration. This paper focuses on the techniques and methods employed, and analyze the difference from the latest article review. The analysis based on the literature review indicates the development in the research trend and estimates the energy saving based on the techniques, mechanism and modeling and protection scheme by identifying the advantages and benefits for the next research. Results of obtained, we viewed from the ease and the great impact on power saving, the technology of sleep mode on the standby network is possible. The scheme that is carried with a protection mechanism is set to sleep and wake quickly. The easiness is a principal aspect that encourage to look into best protection strategies to save power in IPoWDM networks. Nevertheless, these does not prevent the possibility of development another mechanism. Finally, the potential for future research directions are also discussed.
Wind speed monitoring and alert system using sensor and weather forecast
Authors: Mardiyono M , Sari R E , Dini O N
Published: March 2021

Strong wind allows uproot the trees and causes human victims to be injured or dead. Unfortunately, the strong wind comes suddenly to the trees on the street and many people and traffic are around there. It needs wind speed monitoring and strong wind early warning to avoid the victims due to fallen tree. This paper explains the development of wind monitoring and early warning system using wind speed sensor and weather forecasting. The steps involve investigating the wind speed, designing the system, developing the system, testing, and validating. The result shows that the system can measure the wind speed on the spot in real time and trigger the alert to the people around if the strong wind was occurred. On the other hand, it also informs the forecast of wind speed according to weather web services data few hours before. Applying this system will help the government to prevent the victims of fallen tree due to strong wind.
Victim identification application with face recognition based on android
Authors: Triyono L , Handoko S , Puspawaty K Y
Published: March 2021

The increase in the population causes the problems faced are also increasing. Problems that arise include that, the number of accident victims who have recently often occurred on the highway, where the victims of the accident suffered minor injuries to severe and some even have to take lives due to accidents on the highway. And the second is crime, like a murder case that can take someone’s life. Often victims do not carry identities, making it difficult for the police or related parties to identify victims of accidents and killings. This system is made in the hope that it can help the police or related parties to be able to recognize the face of the victim without an identity just by using the android application. So that it can save more time in identifying the identity of the victim. Victim face recognition algorithm using Facial Landmark Detector and for its implementation using the Dlib library. To do facial recognition, it is done by taking Figures of victims using an application on android which is then sent to the server for the recognition process. After the image is sent to the server, the recognition process will be carried out, the results of the introduction process are sent back to android to display the results. The level of accuracy of the victim’s face recognition with a wound if using a tolerance of 0.35 is 100%, but if using tolerance 0.2 the level of accuracy is only 25%.
Performance analysis of shape, color and texture features on tracking information face based on CBIR
Authors: Jumi J , Zaenuddin A , Mulyono T
Published: March 2021

The image has the features of shape, color and texture that are vary. Each feature has a different performance in supporting the accuracy of information retrieval using a process approach to CBIR (Content-Based Image Retrieval). On the image with different objects different performance will be generated on each feature. For example, that the performance features of the form of the more dominant compared features color and texture on the image with the face, while the object on the image with the object of interest feature is more dominant than the features of texture and shape. In this research was conducted on the analysis of the performance features of the shape, color and texture in supporting the accuracy of a search using the approach of CBIR (Content Based Image Retrieval). The method used are invariant moment, color moment and GLCM (Grey Level Co-occurrence Matrix). The results showed that the best search accuracy is 95%, where the features of shape has a performance by 50%, 30% color feature and texture feature by 20% with 600test image with object database face.
Nutrient Film Technique (NFT) hydroponic nutrition controlling system using linear regression method
Authors: Nursyahid A , Helmy H , Karimah A I , Setiawan T A
Published: March 2021

Nutrient Film Technique (NFT) hydroponic cultivation could be an alternative to overcome the increasing food need. Nutritional needs supply of hydroponic plant are one of parameters that need to be considered. NFT hydroponic nutrient controlling system aims to facilitate farmers to maintain the amount of nutrition according to plant needs. This system uses linear regression method to control the amount of nutrients. The accuracy results obtained from controlling system experiment are 87.84%.
Fall detecting clothes in realtime based seniors full body motion capture system using multiple inertial sensors
Authors: Yudantoro T R , Pramuditya F , Apriantoro R , Jum’atun S
Published: March 2021

The physical ability of the elderly will decrease along with the aging process, thus increasing the potential for falls. An elderly person who has experienced a fall and is not detected for a long time will bring many possible consequences. Early detection of an elderly fall will help to minimize this possibility by reducing the time between the occurrence of an event and the arrival of medical assistance The purpose of this research is to build a Fall Detecting Clothes in Realtime Based Art Full Body Motion Capture System Using Multiple Inertial Sensors. This system builds by Waterfall methodology where every research step is done in sequence, start from analysis, design, coding, testing. Testing methodology is black box, which is a test every feature function. The Fall Detecting Clothes in Real Time Based Systems Full Body Motion Capture System Using Multiple Inertial Sensors has been tested using black testing box with the results of all feature functions working properly. The system has been tested with several conditions with the results of all controls and output data works properly as well.
Improved Savonius double blade performance using modified blade shaped with variations of the wind flow ratios on the blade inlet and outlet side
Authors: Herlambang Y D , Supriyo S , Prasetiyo B
Published: March 2021

The Savonius turbine is a wind turbine that has a vertical shaft parallel to the turbine blade and has advantages that can save wind energy from all directions at low speeds. The purpose of this study is to examine the Savonius turbine model with variation in the ratio of the blade inlet side and the blade outlet side to improve turbine performance. The research method used is turbine research; conduct an experimental test by varying the ratio of the inlet and outlet sides of the blade (1:1 and 1:2) to the speed of the blade’s wind flow. Then conduct turbine performance analysis to get the best efficiency between the ratio of the inlet and outlet sides of the blade. The test was carried out at wind speeds of 5 m/s, 7 m/s, 9 m/s, 10 m/s, and 12 m/s with lamp loads distributed between 5-40 Watts. Analysis of turbine performance test The test results show that Savonius single blade wind turbine has the best efficiency of 8.43% at 5 m/s wind speed and is able to produce electricity of 10 Watts and then the best efficiency released by a 1:2 double blade wind turbine that has efficiency by 6, 9% at a load of 20 Watt and a 1:1 double blade wind turbine which has an efficiency 4.37% at a load 10 Watt.
Performance of single cylinder diesel engine using triple fuel HSD-LPG-Steam
Authors: Kusuma G E , Sarena S T , Santoso M
Published: March 2021

Fuel system modification techniques to improve engine efficiency could be the way to slow down the energy crisis caused by the lack of new fuel inventions. The Compression Ignition (CI) diesel engine is one of the most preferred engines for both in-land and marine transportation motors. The advantages of compact dimensions and large generated power make CI diesel engine superior to other engine types. The large number of single CI diesel engines use in small fishing vessel engines and agricultural machinery will contribute substantially to fuel consumption in a cumulative manner. Previous researchs on the modification of fuel system with bi-fuel system High Speed Diesel (HSD)oil – Liquified Petroleum Gas (LPG) system capable of reducing Brake Specific Fuel Consumption (BSFC) up to 24% and exhaust gas opacity up to 68%. Subsequent studies focused on engines with single fuel HSD oil but were injected with superheated steam in 1 atm (abs) 130 0C by utilizing Heat Recovery Generating System (HRSG) using heat of exhaust gas for a flowrate of 1.5-4.5 kg/hour. It is capable of delivering the performance improvement of Specific Fuel Consumption (SFC), which is reduced by 8.92% compared to diesel engines without steam injection. Recent research combines the above two modification methods so that diesel will adopt two types of fuel- oil-LPG with additional superheated steam injection resulting from exhaust gas heat cogeneration system. Experimental results of the diesel engine with LPG injection maintained at 0.4 kg/h and 3.5 kg/h superheated steam with an engine variation loading of 0.3-0.7 kWh provide an average AFR of 30.09 and SFC improvement up to 37.2% lower than SFC engine standard with a single fuel HSD oil.
Application of CNC machine router 3-Axis for making of Engravired granite or marble
Authors: Suharto S , Suryanto S , Sarana S , Purbono K
Published: March 2021

The development of a Computer Numerical Controller (CNC) machine specifically for the manufacture of creative product crafts needs to be encouraged to improve the variety and quality of the products. Manual engraving of natural stone (marble, granite) by relying on the skills of people and simple equipment will produce a product with a long time of processing. Competition in the business and industrial world is needed to increase effectiveness and efficiency with short manufacturing time indicators, low prices, more and more interesting design variations. The research objective is to find effective and efficient machining parameters, analyze factors that influence surface roughness, and enrich the variety of creative product designs of marble stone materials. This study uses an experimental method approach which is a study to find the effect of spindle rotation variables, infeed speed, infeed depth on the quality of surface roughness by operating the CNC Machine Router 3-Axis. It was found that the following parameters of the machine are cutting speed machining 30 (m / min), spindle rotation 12000 (rpm), and speed / feed rate 2000 (mm / min). Analysis of factors that influence the surface roughness of marble engraver the higher the speed / rate of infeed and the depth of infeed, the higher the surface roughness value of marble. Computer and engineering software applications are able to increase the variety of creative product designs.
Android based maintenance information system for machining workshop in polytechnic high education
Authors: Ardjo A S , Wardihani E D , Prayitno P
Published: March 2021

There are six state polytechnics aged 36 years old in Indonesia. The six polytechnics have machining workshops with the same number and machines. The problem that arises in Semarang State Polytechnic is the maintenance system that has not been integrated into a system, even though the electronic maintenance and repair activities have been carried out. The purpose of this study is to develop a maintenance information system that can control all of its activities well. The system is built with an object-oriented approach implemented by android. Research results include: database systems, web application systems, and android application systems that have delivered output correctly.
Hybrid power plant of the photovoltaic-fuel cell
Authors: Herlambang Y D , Prasetyo T , Roihatin A , Safarudin Y M , Arifin F
Published: March 2021

The purpose of this research is to study the performance of hydrogen fuel cell to study different fuel flow rate and different concentration to obtain the optimum performance of the cell. First, design a hydrogen fuel cell model, second simulate cell performance toward hydrogen fuel flow rates of 6, 18, and 30 mL/min and fuel concentrations of 50 mol/m3. Subsequently, we obtained the characteristics of voltage-electric current density and power density-electric current density per stack of fuel cell. The research of this hydrogen fuel cell obtained the power density optimum of 0.0471 mW/cm2 at a cell current density of 0.135 mA/cm2 and a cell voltage of 0.35 V. The greater the load the greater the time used by the battery for instant loads. The average time when the load is small is 10 W with a time of 240 hours and the fastest time when a large load is 400 watts with a time of 6 hours. Decreasing battery discharge time to the same load due to the completion of power losses in each device or circuit that produces the power generated by the battery does not reach the maximum load.
Performance of a solar chimney configuration to achieve equal flow rate for ventilation of three-story building
Authors: Nguyen T V , Quoc Nguyen Y
Published: March 2021

In energy-efficient buildings, natural ventilation using solar chimneys greatly reduces energy consumption. In this study, a solar chimney was installed in a three-story building to examine the flow rate of the floors while balancing the flow rate of each floor. To predict the flow rate, a fluid dynamics model was developed based on a computational fluid dynamics (CFD) method with a calculated model of RNG k-e, heat flux 600 W/m2
. By changing design parameters, the air flow was investigated.
Forced and natural ventilation of a room with a combined solar chimney and Earth - to - Air Heat Exchanger system
Authors: Nguyen V T , Nguyen Y Q
Published: March 2021

In this study, a passive ventilation and cooling technique which is widely used in sustainable building designs was investigated by a numerical simulation based on computational fluid dynamics (CFD). A system of a solar chimney (SC) and an Earth-to-Air Heat Exchanger (EAHE) is able to ensure thermal comfort in a house by generating an air flow which is induced by the thermal effect. The solar chimney drew ambient air (at 35°C) through the inlet of EAHE; the air flow was cooled by a lower temperature of the underground pipes (at 20°C) before circulating inside the house and leaving through the outlet of the solar chimney. Both the openings of the system were exposed to the atmosphere, and the atmospheric pressure was set at the inlet of the EAHE pipe and the outlet of the solar chimney. The performance of this ventilation and cooling system was analyzed under effects of design parameters, including the gap of the chimney, the diameter and length of the EAHE pipe as well as the solar heat flux applied on the wall of the air channel of the chimney. The results of the assessed parameters, such as temperature inside the house, show that the indoor temperature was reduced to 25°C and 26°C, respectively for the forced ventilation case of 0.2 m/s and natural ventilation case in the configuration with the EAHE pipe length of 11m. The coupled solar chimney and EAHE system can achieve the thermal comfort conditions for both cases of natural and forced ventilation.
Minimizing Dynamic Loading Resonance of Battery Pack Subjected to Road Profile Loads
Authors: Abdillah Muhammad Farkhan , Budiman Bentang Arief , Prasetio Ignatius Pulung , Sambegoro Poetro Lebdo
Published: March 2021

One of the main problems in designing battery packing for electric vehicles is the appearance of deformation in the components due to vibration generated by road profile. The vibration brings the most significant effect on the battery packing due to low frequency and high amplitude. Resonance occurs at low frequency since most of the E-trike components have a low natural frequency. This should be avoided to increase the reliability of the battery pack due to mechanical loadings. Modal analysis, Quarter Car Model (QCM), and optimization were conducted in this work. Modal analysis is used to find the natural frequencies of the battery pack on several modes of vibrations. Simulink of the Quarter Car Model (QCM) produces the load from the road profiles based on ISO 8608. The load from the road profiles is used as the input in the Ansys 16.0 Harmonic Analysis. The output is the deformation frequency response for the bottom side case of the battery pack. To reduce the outcome of resonance, a damping mechanism is selected to reduce maximum amplitude from road profile at a resonance frequency. The simulation results show that the damping mechanism is the suitable technology to decrease the major amplitude of the deformations from road profile with reduction up to 54% lower than the previous model. The lower deformations of the battery pack component reduce the battery pack’s possible accident due to vibration.
Numerical simulation of a solar chimney for natural ventilation of a building: Comparison of different computational domains
Authors: Huynh Trieu N , Nguyen Y Q
Published: March 2021

Numerical simulations, particularly those based on the Computational Fluid Dynamics (CFD) Method, have been widely employed in engineering and design, such as design of green buildings. In this study, we investigated effects of the computational domain, a factor influencing the accuracy of a CFD simulation, of a solar chimney, a device for natural ventilation of buildings, on the predicted performance of a solar chimney attached to a building. Four different domains which, in turn, included both the chimney and the house, the chimney and the inlet length, the chimney with the horizontal inlet, and only the air channel of the chimney, were examined. The CFD model was based on the RANS equations and RNG k – ∊ turbulence model. The chimney had different heights, gaps, heat fluxes, and the location of the heat source in the air channel. The results show that the differences in the predicted flow rate and temperature rises through the chimney among the domains changed with the height, gap, and the location of the heat source. The simplest domain, which was a simple vertical rectangular channel, over – predicted the flow rate and under – predicted the temperature rise. The main cause of its worse performance is because of its inability to model the separation zones near the inlet of the air channel. Therefore, it is not recommended for high accuracy – simulations. Two other simpler domains, which included the inlet length and only the inlet, can be used when the required accuracy is within 10.0%. The full domain consisting of both the chimney and the building is preferred for the highest accuracy.