bluuebunny/crossref_metadata_2025 huggingface dataset:
Morphological characteristic of black-winged myna (acridotheres melanopterus)*
Authors: Vernia Renaldi Ednin , Tritto Anais , Abinawanto Abinawanto , Winarni Nurul , mayasari Anita , Sedayu Agung , Bowolaksono Anom
Published: September 2018

Black-winged myna (Acridotheres melanopterus) is an endemic bird of Java and Bali, currently critically endangered based on International Union of Conservation for Nature (IUCN) since 2010. The study about black-winged myna morphological characteristic is important because it has two relatives with almost identical features of morphology. The information can be used as a basis in breeding management to avoid hybridization. The study aims to determine the morphological characteristics of black-winged myna. The sample selection was done using purposive sampling method. Data was taken from 36 black-winged mynas with >=2 years old. Data collection was done by measuring and documenting every morphological feature of the observed body parts. Documentation of the wings, back, chest, head and sides of the body are taken from each bird using a digital camera. The results showed that almost the entire body of black-winged myna covered by white feather, black feather only present on the cover of the wings and tail. Black eyes surrounded by yellow skin without feather. The beak is orange with blackish parts around the nostrils. The bird has yellow legs with three fingers at the front and one finger at the back. The average body length of this bird is 22.5 cm, weight 89.02 g, width 5.98 cm, body circumference 14.36 cm and wingspan 38.49 cm.
Sexual behaviour of lowland anoa (bubalus depressicornis) in the captivity of anoa breeding centre (ABC) Manado*
Authors: Mayasari Anita , Arini Diah Irawati Dwi , Suryawan Ady , Suryaningsih Rahma , Vernia Renaldi Ednin , Abinawanto Abinawanto , Suryanda Ade , Bowolaksono Anom
Published: September 2018

Low land Anoa is an endangered and endemic species to Sulawesi. The solitary, monogamous, wild and aggresive characteristic make them difficult to mate. The purpose of this study was to determine the sexual behaviour of young anoa pairs and mature anoa pairs at ABC. The study was conducted on 4 until 16 August 2017. Behavioural observation was done using animal focal sampling technique by recording the sexual behaviour that occur during the mating process of each pair. The results showed there are differences in sexual behaviour between the pairs of anoa. In the young anoa pairs, there were no attempted of mounting behaviour, penile erection, penile intromission.
A model confirmatory of adherence behavior with standard medication treatment among patients with asthma in Medan-Indonesia
Authors: Wahyuni Arlinda Sari , Hamid Rozaimah Zain , Syafiuddin Tamsil , Bachtiar Adang , Martina Sake Juli , Amelia Rina
Published: September 2018

Asthma problems are often linked to treatment management factors which include the non-maximal behavior of the patients and doctors. The adherence concept emphasizes a strong commitment between physicians and patients to achieve maximum behavior towards the treatment. This study aimed to construct a model of adherence to treatment of patients with asthma and also aimed to set a valid and reliable adherence measurement tool that might be applied to patients with asthma, particularly those who live in Medan-Indonesia.The study was quantitative research employed a cross sectional approach. The samples were 200 adult patients with asthma who receive standard asthma medications, patients with the stable condition and do not suffer from severe asthma or other comorbidities. The study performed a consecutive sampling of the technique which was obtained from physician's data (general/lung specialist). Data were analyzed by performing confirmatory analysis through Structural Equation Modelling analysis. The study produced a measurement model of asthma patients' adherence to the treatment among those who live in Medan. The study found that the asthma patients who live in Medan have good psychometric value (valid, reliable and fit to model): adherence I (beliefs, knowledge, and attitudes), adherence II (doctor-patient communication, actions, family support).
The performance of up-draft gasifier with various of air flow rate in gasification palm starch waste
Authors: Saputro Herman , Muttaqin Imam , Supriyadi Supriyadi , Fadlullah Vani , Fitriana Laila , Firdani Tutuko , Muslim Riyadi , Khaniffudin Khaniffudin , Lasmini Sri , Sutrisno Valiant L P , Wijayanto Danar S , Munir Fudhail A
Published: September 2018

Conversion of palm starch waste biomass into energy sources through gasification process could be done to meet the energy requirement in palm noodle industry. This research used the Refuse Derived Fuel (RDF-5) based on the palm Starch waste. This is due to the how to overcome the solid waste around the home industry of noodle in Jawa Tengah. This study was conducted to determine the performance of up-draft gasifier with variations of air flow rate, i.e., 72 lpm, 95 lpm, and 123 lpm. The results showed that the variation of air flow rate has affected to the gasification product. The optimum LHV value occurred at 122 l/m air flow rate, where the LHV value increased with the increase of air flow rate, but after passing 122 l/m, the LHV value was continually decreasing.
The influence of the number of rotor blades on the performance of orthopter wind turbine
Authors: Firdaus Rachmat , Kiwata Takahiro , Nagao Koji , Kono Takaaki
Published: September 2018

This paper describes the influence of the number of rotor blades the performance of the orthopter wind turbine. The orthopter wind turbine is combination between a drag-type and a lift-type vertical axis wind turbine which each blade combines a rotating movement around its own axis and a rotating movement around turbine's axis. In this case, the pitch of the blades was controlled by using a chain and sprockets arrangement to ensure that the blades rotated around their own axis by 360 degrees during the each two full revolution of the main rotor. To improve the performance of this wind turbine, the number of blades, was investigated by wind tunnel. By conducting two-dimensional unsteady CFD simulations, the power and torque of the vertical axis wind turbine and the flow around blades were also analyzed. The numerical simulation by using turbulence model predicted good agreement of the performance with experiment qualitatively.
Experimental study effect of diameter and number of spray nozzle holes on counterflow cooling tower to improve cooling effectiveness
Authors: Fahruddin A'rasy , Muslimin Muslimin , Susilo Ginanjar Deni , Akbar Ali
Published: September 2018

The cooling system is an essential part of the production process within the plant. In the cooling system using cooling tower, efficiency can be improved by increasing the effectiveness of cooling through nozzle modification. This study aims to determine the effect of diameter and number of nozzle holes on cooling effectiveness. The data were taken from the experiments using prototype of counterflow cooling tower with dimension of high x cross-sectional area are 120 cm x 40 cm x 40 cm. Diameter varied by 1; 1.5; and 2 mm, while the number of nozzle holes 4; 8; 16. The results show that the highest cooling effectiveness was achieved at nozzle diameter 1.5 mm with the number of holes 8 that is 38.77%.
Technical and economical feasibility analysis of photovoltaic power installation on a university campus in indonesia
Authors: Kristiawan Ruben Bayu , Widiastuti Indah , Suharno Suharno
Published: September 2018

Development of Renewable Energy System (RES) in Indonesia is an alternative solution for an increasing of fuel-based energy demand problem. Higher educational institutes may contribute to reducing the energy consumption by implementing green campus policies which include creating a medium-scale solar power installation. The research presents the feasibility analysis of photovoltaic power generation plants development in a university in the southern part of Java Island, Indonesia. In this article, different on/off-grid photovoltaic systems were considered in one of the campuses located in rural area. The technical viability of the proposed solar energy system is analyzed using HOMER software. The economic aspects of the plant are analyzed based on standard parameters, the NPC (Net Present Cost) and IRR (Internal Rate of Return) methods. The simulation studies are carried out to identify technical and cost-effective configuration. Feasibility study of the Photovoltaic energy generation was conducted by revealing their potential contributions and applicabilities. This study gives emphasis to the techno-economic analysis of renovating the energy supply system of a grid-connected large office building through an RES. Finally, results of the research can be used as the preference for the relevant stakeholders and policymakers in developing the grid-connected RES system.
Investigation on the improvement of car air conditioning system performance using an ejector
Authors: Arifianto Enang Suma , Berman Ega Taqwali , Mutaufiq Mutaufiq
Published: September 2018

The purpose of this research is to know the improvement of car air conditioner system performance using an ejector. The study was conducted on a car engine with power 100 PS (74 kW) @ 5000 rpm. The test procedure is carried out under two conditions: the normal refrigeration cycle mode and the refrigeration cycle mode with the ejector. The working fluid used in the refrigeration cycle is R-134a. Performance data was measured on engine revolutions ranging from 1500 - 3000 rpm. Finally, the results showed that ejector usage on AC system generates an increase in the refrigeration effect and coefficient of performance (COP) of 25% and 22%, respectively. This has implications to better cooling capacity and compressor work that is lighter.
Production of clean synthetic gas from palm shell in a fixed bed gasifier with recycle system of producer gas
Authors: Pranolo Sunu Herwi , Khoir Muhammad Tasmiul , Pradhana Muhammad Fahreza
Published: September 2018

Tar as side product of biomass gasification could potentially degrade internal combustion engine performance if syngas is used for the fuel. Tar reduction may be achievable with recycling of outlet producer gas back into the gasifier. This research studied the effects of recycle system to tar content in syngas as product of palm shell gasification in a fixed bed gasifier. The effects of recycling system were examined using gasification of palm shell with primary air at 3.30 Nm3/h, mixture of primary air at 1.80 Nm3/h and secondary air at 1.50 Nm3/h, and mixture of primary air and recycled gas. Volumetric rate of recycle gas were varied at 0.90 and 1.20 Nm3/h respectively. Gasification performance evaluation was based on Specific Gasification Rate. Syngas quality was rated with tar content, CO, CH4, H2, CO2, and N2 composition. The highest Specific Gasification Rate of 111.71 kg/m2h and tar reduction up to 61.95% were achieved using recycle system at volumetric rate of 0.90 Nm3/h with temperature of operation is 750°C. The highest heating value of 6.34 MJ/Nm3 was attained using recycled gas volumetric rate at 1.20 Nm3/h.
Covered conductor burn-down prevention for distribution line in Indonesia
Authors: Pramana Putu Agus Aditya , Kusuma Aristo Adi , Munir Buyung Sofiarto , Tambunan Handrea Bernando
Published: September 2018

Covered conductor (CC) is used to resolve temporary line to ground fault in the distribution line. However, some cases of CC burn down were found in Indonesia. These phenomena were triggered by lightning strikes that cause transient overvoltage with a magnitude greater than basic insulation level (BIL) of insulator. Consequently, short circuit current will flow through the pinhole on CC. Burn down phenomena will create high impedance fault that is unable to be detected by protection relay, thus the conductor will remain energized and harmful to the surroundings. Therefore, this paper presents study about CC burn down prevention. The study was performed using transient simulation to find the effect of earth wire utilization against the transient overvoltage due to lightning strike. In addition, finite element simulation and laboratory testing were also performed to analyze the effect of power arc device on burn down prevention. The results show that the lightning strike with negative polarity will not cause transient overvoltage with a magnitude greater than the insulator BIL. However, if the lighting strikes have positive polarity then the insulator BIL will be potentially exceeded. Furthermore, the utilization of power arc device will prevent the CC burn down.
Passive filter design for reducing harmonics in light emitting diode bulb
Authors: Ali Hanafiah Rambe , Safril Muhammad , Suherman Suherman
Published: September 2018

Harmonics reduce power quality and increase inefficiency. Although light emitting diode (LED) bulb has been considered more efficient than previous bulb technologies; its internal circuits potentially generate additional problems. This paper has surveyed 6 LED bulb samples and measured the harmonics generated by the internal circuits. As a result. 7 Watt type B LED bulb produces the highest 3rd order harmonics current which is incompatible with IEC61000-3-2 Class C. A prototype of LC filter is designed to decrease the harmonic level. The measurement shows that the designed passive filter is able to reduce at least 81.3% of harmonics.
Design of drinkable tap water system at X Apartment, Jakarta
Authors: Prameswari Hariastuti , Tazkiaturrizki  , Ratnaningsih R
Published: September 2018

This design aims to contrive a plumbing system X Apartment, Jakarta with a separate clean water and drinking water system. Water supply system that applied to this apartment is roof tank system. Fluctuations in the use of clean water are used to determine the capacity of reservoirs and pumps using the equivalent apartments such as The Bellagio Residence Apartment, Four Winds Apartment, Tamansari Sudirman Apartment, and Setiabudi Residence Apartment. Total demand for clean water for the 1st and 2nd tower is 315.8 m3/day and 39 m3/day for drinking water with 216 m3 of ground water tank capacity. Transfer pumps work for 12 hour/day and the capacity of clean water roof tank for the 1st and 2nd tower are 67.5 m3 while for drinking water roof tank are 7.2 m3. System that has been chosen used 2 stand pipes for both clean water, drinking water, and booster pumps in each tower. This design concluded that The investment cost of clean water and drinking water system and also the construction of X Apartment reservoirs is Rp. 2.393.889.860 and the cost of drinking water that can be saved by residents when using drinkable tap water system is Rp. 874.656 per m3.
Increasing lipid content from biomass of microalgae to produce biofuels with optimization of nitrogen source
Authors: Ayuwaningsih Istikhomah Putri , Fachrul Melati Ferianita , Rinanti Astri
Published: September 2018

The aim of this research is to analyze the effect of urea fertilizer as a nitrogen source to lipid productivity of mixed culture of green microalgae consisting of Monoraphidium sp., Chlorella sorokiniana, and Scenedesmus obliquus as lipid sources. In research, cultures were cultivated in a 1.5 L glass photobioreactor with batch culture system. The operational conditions of this research were carried out at pH 6.0, 27 °C, aeration with air flow 150 mL/sec, and 2400 lux with vary amount of urea as a source of nitrogen as much (grams) 0.0; 0.5; 1.0. The Bligh and Dyer extraction is performed to produce biofuels after harvesting process and to analyze lipid content. Analysis of fatty acids using Gas Chromatography Mass Spectrometry (GCMS) Method, analysis of dry weight using Gravimetric Method, and analysis of cell density using Spectrofotometry Method. This research concludes that with 0.5 grams of urea fertilizer can produce dry weight and total lipid content optimally that were 0.26% (w/w) and 36,35% (w/w). This research concludes that increasing amount of nitrogen source could be increasing green microalgae biomass but is not for increased lipid content. The high lipid content can be produced by decreasing 50% nitrogen source.
Increasing content of lipid in tropical microalgae Chlorella sorokiniana and Closterium sp. with variation of nitrogen content and extraction temperature
Authors: Karima Amani , Silalahi Mawar DS , Rinanti Astri
Published: September 2018

This research was aimed to obtain algae biofuels as an alternative energy which comes from tropical microalgae biomass Chlorella sorokiniana and Closterium sp. The cultivation was performed at a controlled room in batch culture photobioreactor, temperature 27°C, pH 6, aeration with air flow rate of 150 mL/sec, and light intensity at 2400 lux. These nutrient sources used artificial PHM with KNO3 variation as a nitrogen source of 0 grams; 0.25 grams; 0.5 grams; 1 gram. The research involved microalgae lipid extraction with Blight & Dyer method and also carried out support of alcohol, chloroform and distilled water (1:1:1) with optimum temperature 30oC. Oil yields that obtained were analyzed with Gas Chromatography Mass Spectrometry (GC-MS) method, dry weight with a gravimetric method and cell density with spectrophotometry. The result showed that the reduction of KNO3 materials (0,25 gr) can produce biomass and highest total lipid content at 0,41 g/L and 20,31 %/(w/w). The results showed that KNO3 decreased the amount of biomass which was not significant but the total lipid content of microalgae was increased. Lipid content and fatty acids extracted from Blight & Dyer showed oil content that could potentially be the raw material of biodiesel.
Isolation and screening of resistant bacteria of heavy metal (Fe) at ship dismantling
Authors: Titah Harmin Sulistiyaning , Pratikno Herman , Moesriati Atiek , Putera Rizky Islami , Imron Muhammad Fauzul
Published: September 2018

The activity of ship dismantling is one of the sources of metal pollutant that polluted the environment. The aims of this study were analyze the iron concentration from the ship dismantling area, to isolate the bacteria from those area, and to determine the bacteria resistant on iron. Samplings was conducted in three point sampling at sea water and soil coast, respectively. Isolation of bacteria was carried out using pour plate methods. All isolated bacteria in seawater and soil samples were inoculated on nutrient agar medium (NA) containing ferrous metals (Fe2+) with various concentrations (0; 1,000; 2,000; 3,000; 4,000; 5,000; and 6,000 μg/mL). Based on the results, sea water and soil indicated that those area have contaminated with iron. The concentration of iron in seawater was 1.03, 1.01 and 1.00 μg/mL, respectively. Meanwhile, the concentration of iron in soil was 962.0, 966.05, 981.00 mg/kg, respectively. The result of qualitative and quantitative analysis showed that the isolates of AT, AL and CL coded bacteria have high resistance to the effect of iron. It indicated with clear zone of 6.00-7.00 mm at 6,000 μg/mL. In conclusion, both of bacteria are potential to be used for bioremediation of the ferrous metal (Fe2+) in further investigation.
Utilisation of sustainable green energy in young generation
Authors: Yustiani Yonik M , Hasbiah Astri , Mutmainah Latifah
Published: September 2018

Indonesia has many green energy potencies to replace the fossil-based conventional energy. However, the use of this conventional energy is still in dominant. It is understandable that older generations are difficult to change their habits in using green energy for various reasons. Whereas the younger generation are expected to starts using environmentally friendly energy, in the form of new and renewable energy. This study aims to determine the tendency of young people to use renewable energy. 60 respondents were selected from department of environmental engineering students, Pasundan University in Bandung, Indonesia. The respondents range from first to fourth year students. Assumption used in respondents selection was student with environmental engineering educational background will have knowledge on renewable energy. This research conducted through questionnaires. The results show that only 10% of the respondents have used the renewable energy, i.e. solar energy. Whereas 90% of respondents do not use renewable energy due to lack of knowledge on how to start using it. Nevertheless, 97% of respondents consider that using green energy is a proud thing. From a variety of green energy alternatives, 50% of the students consider solid waste as the most potential source of renewable energy in Indonesia.
Sustainable smart forest monitoring system for burning forest and deforestation detection
Authors: Darlis Denny , Sirait Dion Saputra Parulian , Maulana Dimas Bayu
Published: September 2018

Forests sustain the planet and provide air, soil, climate cycles. These ecosystem services enable economic sectors. Forests are under threat, last decade about 13 million of hectares of forests were deforested. A system to provide monitoring and prevention are needed to sustain the forest but only a few countries have implemented a smart forest system alike. By utilizing sensors, minimum wireless system and renewable energy will provide more accurate, real time, efficient energy and easy to maintain compare to the conventional conservation. Our proposed system will consist of low power camera and grid of fire and smoke detectors, humidity and temperature sensors connected each other as a mesh network and each powered by a solar panel and lithium battery processed by microcontroller then send data periodically to the monitoring server and gives precaution information when some case happened. The system use environment disguise and periodically maintain to ensure it works. While precaution information can be shared and access by government or even public, human act are needed to solve it. Thus it could assist the already implemented system and utilize the available resources as possible.
Quality engineering of crumb rubber by minimizing rework using fuzzy FMEA
Authors: Syahputri Khalida , Leviza Jelly , Sari Rahmi M , Indah Rizkya T , Siregar Ikhsan , Tambunan Mangara M
Published: September 2018

The quality of crumb rubber has several grades according to Indonesian Rubber Standard (SIR). In crumb rubber process production, lots of products need to rework because it does not match with specified specifications. The types of rework product based on SIR that cause of defects such as hard, soft and dirt. However, the reworked products will produce crumb rubber with lower grade quality. This certainly affects the selling price of the crumb rubber. Also rework will incur additional production costs. Efforts that can be used to minimize the number of rework is to identify the factors that cause failure and determine the priority level of the risk of failure in the production process crumb rubber. It can be used is by using Fuzzy FMEA method. This method aims to get the risk of failure and the level of risk of failure during the crumb rubber production process. Fuzzy FMEA method also obtained the highest RPN value is equal to 489 for the risk of failure of engine dryer temperature is too high. Through the highest priority level of failure (RPN), company can determine the steps to make improvements during the production process to improve the quality of crumb rubber products.
C2C marketplace model in fishery product trading application using SMS gateway
Authors: Kurniawan Dwi Ely , Janah Nur Zahrati , Wibowo Ari , Mufida Mir'atul Khusna , Prasetyawan Purwono
Published: September 2018

Most people in Batam hinterland work as a fisherman. The process of the fishery product distribution, however, is inefficient. The absence of marketplace causes fishermen's difficulty in selling their fishery products. This sales and distribution problem can be mediated using our web application. This research attempts to facilitate customer to customer (C2C) transaction by providing fishery products information via text messages. The SMS gateway is deemed to be the best alternative in a rural area with poor infrastructure. Fishermen are only required to send information about their fishery product in a text message with their phone and the system will receive and display them. The payment is then done using the Cash on Delivery system (COD). This research concludes that the system runs smoothly; it can display the fishery product offers and manage the fishermen and their fishery product data. The SMS gateway test showed a good result in the experiment involving 10 consecutive texting with three different treatments.
The evaluation on a mobile augmented reality application as therapy media
Authors: Pradibta Hendra , Wijaya Indra Dharma , Ronilaya Ferdian , Nurhasan Usman
Published: September 2018

ARdoa is Mobile Augmented Reality (MAR) application used as a therapy media for children with Autism Spectrum Disorder (ASD). The content of this application is daily prayers for Muslim children, and it is designed in the form of audio-video animation. This paper is aimed at discussing the evaluation and testing of the development process of MAR ARdoa. Technical evaluation and testing are conducted on several aspects, specifically testing the detection and tracking. Moreover, the method used in the process is to identify the distance, surface area and ideal conditions for the utilization of this application. The completion of the test is based on whether or not the content appearing on the marker has been made. From the evaluation and testing process, it is obtained ideal distance, surface area and conditions for the utilization of MAR ARdoa that can be used as standards for its development.
Augmented reality of traditional food for nutrition education
Authors: Yulia Cica , Hasbullah H , Nikmawati E.E. , Mubaroq S.R. , Abdullah Cep Ubad , Widiaty Isma
Published: September 2018

This study aims to develop an augmented reality medium of traditional Sundanese food for nutrition education for teenagers. The media designed also consists of values of local wisdom education. The application is named AR Ma'Ugiz. The making of the application starts with story board design, 3D objects of traditional Sundanese food design using blender software and making videos about the making of the food. To make the videos, this paper uses Wondershare Filmora software. In an attempt of making AR Ma'Ugiz compatible to many platform, a Unity 3D is employed. The results of the research show that Augmented Reality designed to introduce traditional Sundanese food to teenagers is interesting and fun for them. In addition, the teenager students have more opportunities to explore the food in terms of the making procedure and nutrition information. Thus, the media used in nutrition education appear to have strengths in introducing values of local wisdom. In the meantime, local wisdom plays an important role in character education which, in this context, enables students to love their culture, including their traditional food.
Prototyping of Flooding Early Warning System using Internet of Things Technology and Social Media
Authors: Haris Rismayana Aris , Sugianto Castaka Agus , Bagus Budiyanto Ida
Published: September 2018

When the rainy season arrives, flooding is a common phenomenon. Almost every street, housing, village, river, even in the city center, wherever floods can occur. One effort to prevent the flooding is to create a floodgate on reservoirs or dams that are used to control the water distribution. The water level at this dam must be checked frequently to anticipate if the water level is at a dangerous level. The inspection of water levels will be very difficult if it must be conducted by humans who must be available in the field at any time. This research aims to create a prototype system that can replace the human role in monitoring the dam water level condition at any time by developing an integrated system between hardware and software using IoT (Internet of Things) technology approach and social media (twitter and telegram). The developed system consists of the height sensor (distance), microcontroller and wifi module, which is placed on the water gate. This system serves to measure the water level at any time and send data in real time to the server. The results of system testing performed shows that when the system is in normal circumstances, the system sends data to the server every minute, and updates the status of water level in twitter every 5 minutes. In case the water level has exceeded a predetermined limit, the system sends data to the server every 5 seconds and passes the warning message to all registered telegram contacts.
Analysis and Implementation of Goal-Directed Design in Reproductive Health Learning Media for High School Student Case Study: Mitra Citra Remaja (MCR)
Authors: Abidin David Meulana , Junaedi Danang , Sardi Indra Lukmana
Published: September 2018

MCR as a non-governmental organization focused on providing education and other supporting activities related to reproductive health education issues to high school students. However, the efforts that have been done still get less satisfied feedback from students, because they have not been able to deliver thoroughly. This is due to the inadequate facilities used especially for a large number of participants in the school who visited and the number of MCR volunteers are limited so that the extension only covers the city of Bandung. In addition, there is no regular schedule that can be used for extension activities Thus, it takes an internet-based learning media that creates independent learning process and without limitation of space and time. One important aspect of the development of learning media is the usability that is closely related to the user interface. The approach used for designing user interface model is by using goal-directed design method. Begin by identifying user objectives and behaviours and translating into user models of learning media of reproductive health. We have tested usability with QUIM parameters of user interface model generated through goal-directed design implementation, which reaches average usability percentage more than 85%, so it can be said to comply usability element with a very good category.
Research on Contact Pressure Distribution of Pad
Authors: Chen Dong , Zou Guofeng
Published: September 2018

A simplified thermo-structural coupling finite element model of disc brake was developed. The contact pressure distribution of new pad was simulated under an emergency braking condition. The result shows that the contact pressure distribution of pad is not uniform when the new pad is in normal working condition. The inhomogeneity of the contact pressure is a critical cause of tangential partial wear. Compared the contact pressure distribution of new pad, uniform wear pad and tangential partial wear pad, the influence of wear amount and tangential partial wear on the contact pressure of pad was investigated. The results prove that the influence of wear amount on the contact pressure of pad is very small, while tangential partial wear has a great influence on the contact pressure of pad. The wear and force characteristics of pad are analyzed. The wear of its life cycle of pad is obtained, and the reliability and accuracy of the simulation are verified.
Research on Reducer Power Measurement System of Bridge Crane
Authors: Ge Zhihao , Tong Yifei , Zhong Meng , Li Xiangdong
Published: September 2018

In this paper, the reducer is taken as the research object for power measurement. First, the demand of reducer power measurement is analyzed, and the method for measuring power is determined. Then, in view of the power measurement method adopted by the reducer, the overall framework of the measuring system is carried out, and the host system is designed.
Finite element analysis of Bridge Crane Metal Structure Based on ABAQUS
Authors: Meng Zhong , Yifei Tong , Xiangdong LI
Published: September 2018

Taking the QD-type (50/10t-31.5) bridge crane as the research object and the finite element method as theoretical basis, the metal structure using ABAQUS software is analyzed. Firstly, the three-dimensional model of the metal structure is established according to the design parameters. Second, the bridge crane under three typical operation conditions is analyzed and the stress and displacement analysis results are presented. And, the strength and stiffness of the crane are verified based on the analysis results. Moreover, the maximum stress and displacement under dangerous conditions of the crane are calculated by theoretical calculation. By comparing the results of the theoretical method and the finite element method. The research can favor to increase the design efficiency.
Unsteady aerodynamics modeling using Volterra series expansed by basis function
Authors: Chen Senlin , Gao Zhenghong
Published: September 2018

Unsteady aerodynamics modeling must accurately describe nonlinear aerodynamic characteristics in addition to unsteady aerodynamic characteristics. The Volterra series has attracted increasing attention as a powerful tool for nonlinear system modeling. It is essential to incorporate the influence of the second-order Volterra kernel or higher-order kernels to build a nonlinear unsteady aerodynamics model. The main difficulty in the identification of higher-order kernels is that the number of parameters to be identified increases exponentially with the order of a kernel. This paper expands the Volterra kernels with the four-order B-spline wavelet on the interval as the basis function, converts the problem into the solution of low-dimensional equations, and obtains a stable solution. A nonlinear unsteady aerodynamics model is built by identifying the second-order and third-order kernels of the lift, drag, and pitching moment coefficients of the NACA0012 airfoil. Then the model is verified at different reduced frequencies using CFD.
A flexible motion tracking system based on inertial sensors
Authors: Han Zhonghao , Hu Lei , Guo Na , Yang Biao , Liu Hongsheng , Wang Yuhan
Published: September 2018

As a newly emerging human-computer interaction, motion tracking technology offers a way to extract human motion data. This paper presents a series of techniques to improve the flexibility of the motion tracking system based on the inertial measurement units (IMUs). First, we built a most miniatured wireless tracking node by integrating an IMU, a Wi-Fi module and a power supply. Then, the data transfer rate was optimized using an asynchronous query method. Finally, to simplify the setup and make the interchangeability of all nodes possible, we designed a calibration procedure and trained a support vector machine (SVM) model to determine the binding relation between the body segments and the tracking nodes after setup. The evaluations of the whole system justify the effectiveness of proposed methods and demonstrate its advantages compared to other commercial motion tracking system.
Conceptual sizing of next supersonic passenger aircraft from regression of the limited existing designs
Authors: Joiner Keith F. , Zahra Jordan , Rehman Obaid
Published: September 2018

Despite previous versions, there are no current supersonic passenger transport aircraft. Much aircraft research is focused on hypersonic flight and the new technologies therein and is therefore unlikely to add to commercial versions anytime soon. This study re-examines conceptual sizing of a supersonic transport aircraft based on extant supersonic designs in order to ignite research into whether a commercially-viable design might exist. Key metrics are developed using distances between likely airport network nodes, an assumed number of passengers, and a reduction in transport time to one-third of current journeys. The study uses multiple response regression of known designs to develop key performance formulae, which are then optimized to set performance values so as to estimate an initial aircraft size, including an expected value analysis to guide the next conceptual design iteration. Twenty years ago a NASA Langley Research optimization system was used to examine non-linear regression of supersonic aircraft designs and to optimize such a design around similar performance criteria. In contrast, this work is the first supersonic transport aircraft sizing to use commercially-available Excel add-on software and standard design-for-sixsigma analysis techniques; notably for the sensitivity analyses to guide the next design iteration.
Design and Implementation a Measurement System for Aircraft Cabin Heat Comfort Test
Authors: Jiani Yan
Published: September 2018

A measure system is designed for aircraft cabin thermal comfort test, which can measure temperature, wind speed, humidity, pressure, flux, position parameters. The test results can be used to calibrate the model of temperature field simulation and cabin flow field simulation. The system synchronization accuracy is achieved 1mS. The measure system uses distributed configuration which comprises many measure cells. Test datum in the cabin can be set parameters and controlled re are transmitted to computer via internet. The measure equipment motely via internet, so that the measurement interfere affected by human activities can be reduced and the measurement accuracy can be improved. The measure system can communicate with instrument installation, making the cabin airflow field test automatism come true.
Design on Spaceborne Three Orthotropic Thin-Wall Tubular Antennas Deployment Mechanism
Authors: Fan Wenjie , Wu Lin , Pen Hongmin
Published: September 2018

The purpose of spaceborne three orthotropic thin-wall tubular antenna is for space science probe which consists of three orthotropic tubular antennas. Three orthotropic thin-wall tubular antennas deployment mechanism is designed which consists of upper plate, lower plate, reel, burn-wire and tension spring. Flattened antenna tube can be wound in a reel which can be hold-down and locked by Dyneema string. Release by giving current to resistor, the string will melt while its temperature reaches its burning point, then the upper plate will be pulled up and the antennas can be deployed by stored strain energy in itself. According to a certain project requirements three orthotropic thinwall tubular antennas mechanism prototype was developed and tested, antenna tube was broken due to “blossom” phenomenon in deployment process. For avoiding “blossom” during deployment of antennas mechanism, the flange of reel is improved, so antennas can be deployed smoothly. Compared to motor-driven antenna mechanism, this antennas deployment mechanism has advantages of simple structure, lower mass and lower power consumption.
Dynamic positioning accuracy of dual-axis drive mechanism of satellite antenna with multi-clearance coupling
Authors: Qi Chaoqun , Zhang Huibo , You Bindi , Fan Jizhuang , Dai Shijie
Published: September 2018

The dual-axis drive mechanism of satellite antenna as a typical multi-joint aerospace mechanism consists of azimuth axis and pitch axis. The multi-clearance contained within those drive joint cause contact and impact in joint, and consequently affect the dynamic positioning accuracy. A nonlinear dynamic model of planetary gears with multiple clearances couplings is proposed to investigate the influence mechanism of clearances on the dynamic performances. The nonlinear factors such as radial clearance, backlash and time-varying meshing stiffness of the bearing are considered in the model. And the dynamic model of double-axis driving mechanism of satellite antenna with multi-clearance coupling is established. Then positional and rotational speed error curves of antenna reflector at different rotational speed are respectively analyzed. The numerical simulation results show that the influence of multi-clearance coupling on the dynamic positioning accuracy of double-axis drive mechanism of satellite antenna is remarkable.
Research on Shape Remain of Near-Earth Radial Collinear 4-Craft Coulomb Formation
Authors: Yunlong Sun , Changqing Yuan , Zhengguang Li
Published: September 2018

This paper investigates the non-linear relative kinetic model of the collinear 4-craft Coulomb formation in geostationary orbit. Considering the fact that the formation remains statically fixed in the radial direction, using the equilibrium conditions to linearize the dynamic model. To keep the radial static stability of the collinear 4-craft Coulomb formation, the LQR controller is designed based on the linear dynamic model, taking the Coulomb force as the only control force. Considering the unmodeled disturbance force and the model error, the improved LQR control law is designed to improve the robustness of the traditional LQR controller. Simulation is executed by Matlab/Simulink, and numerical simulation results demonstrate the effectiveness of the dynamic model and the proposed control strategy.
Design and Experimental Verification of Double Star Sensor Bracket with Complex Space Angle for Microsatellites
Authors: Chen Long , Xu Yu , Li Xiaoli , Guo Tong , Zhu Cheng , Liu Rui
Published: September 2018

In this paper, a double star sensor bracket design with complex space angle is proposed in order to improve the precision of microsatellites attitude measurement. This bracket is lightweight and is easy to manufacture. Finite element simulation and mechanical experiments are carried out. It is shown that the bracket satisfies the strength and stiffness requirements of microsatellites.
Validation of longitudinal dynamics of Gatimaan Express model in Matlab/Simulink®
Authors: Jha Prabin Kumar , Gokhale Sadanand Sadashiv
Published: September 2018

This paper presents a mathematical model of longitudinal dynamics of Gatimaan Express. It has one locomotive class WAP5, two generator vans, eight second class chair cars and two executive chair cars respectively. Forces associated with longitudinal dynamics of model are developed in Matlab/Simulink. Longitudinal and coupler forces as well longitudinal velocities are studied during the failure of coupler of 3rd (coach of middle train) second class chair. Validation of longitudinal velocity of the model is done by comparing simulated results with measured field data provided by Research Designs Standards Organization (RDSO), Lucknow, India.
Video Tutorials Increase Precision in Minimally Invasive Surgery Training – a Prospective Randomised Trial and Follow-up Study
Authors: Thomaschewski Michael , Esnaashari Hamed , Höfer Anna , Renner Lotta , Benecke Claudia , Zimmermann Markus , Keck Tobias , Laubert Tilman
Published: September 2018

Background Simulation-based practice has become increasingly important in minimally invasive surgery (MIS) training. Nevertheless, personnel resources for demonstration and mentoring simulation-based practice are limited. Video tutorials could be a useful tool to overcome this dilemma. However, the effect of video tutorials on MIS training and improvement of MIS skills is unclear.

Methods A prospective randomised trial (n = 24 MIS novices) was conducted. A video-trainer with three different tasks (#1 – 3) was used for standardised goal-directed MIS training. The subjects were randomised to two groups with standard instructional videos (group A, n = 12) versus comprehensive video tutorials for each training task watched at specific times of repetition (group B, n = 12). Performance was analysed using the MISTELS score. At the beginning and following the curriculum, an MIS cholecystectomy (CHE) was performed on a porcine organ model and analysed using the GOALS score. After 18 weeks, participants performed 10 repetitions of tasks #1 – 3 for follow-up analysis.

Results More participants completed tasks #1 and #2 in group B (83.3 and 75%) than in group A (66.7 and 50%, ns). For task #2, there was a significant improvement in precision in group B (p < 0.001). For the entire cohort, the GOALS-Scores were 12.9 before and 18.9 after the curriculum (p < 0.001), with no significant difference between groups. Upon follow-up, 84.2% (task#1), 26.3% (task#2) and 100% (task#3) of MIS novices were able to reach the defined goals (A vs. B ns). There was a trend for a better MISTELS score in group B upon follow-up.

Conclusions Standardised comprehensive video tutorials watched frequently throughout practice can significantly improve precision in MIC training. This aspect should be incorporated in MIS training.
Modulation of Oxidative Stress and Hyperglycemia by Rheum spiciformis in Alloxan Induced Diabetic Rats and Characterization of Isolated Compound
Authors: Bhat Aashiq , Dar Khalid , Zargar Mohammad , Masood Akbar , Ganie Showkat
Published: September 2018

This study evaluates the ameliorative potential of Rheum spiciformis methanolic (RS-MeOH) extract in reducing oxidative stress and hyperglycemia in albino rats along with characterization of possible therapeutic compound(s). Groups treated with 50 and 100 mg/kg bw plant extract (RS-MeOH ) decrease blood glucose levels from 359.9±8.2 to 209.5±8.5 mg/dl (50 mg/kg bw) and 354.7±13.3 to 162.5±7.4 mg/dl (100 mg/kg bw) on the 0th and 14th day (P<0.001) respectively. This reduction in blood glucose was significant as compared to glibenclamide (20 mg/dl) which reduced glucose levels from 297.7±11.39 to 132.9±8.74 mg/dl on 0th and 14th day respectively. Biochemical parameters triglycerdies, cholesterol, low density lipoprotein (LDL) and creatinine were also reduced in a dose dependent manner. Liver marker enzymes were positively modulated by administration of RS-MeOH (P<0.001). Antioxidant enzyme profile showed an enhanced/better pattern after the administration of RS-MeOH extracts for reduced glutathione, reduced glutathione (GR), glutathione peroxidase (GPx), glutathione–S-transferase (GST) and superoxide dismutase (SOD) in both liver and pancreas. Moreover pancreatic histopathology reports revealed β-cell restorative effects with RS-MeOH, thereby potentiating its role in improving blood glucose levels. RS-MeOH purification and isolation studies involving GC-MS and NMR techniques revealed presence of emodin type compounds in RS-MeOH. Overall Rheum spiciformis showed ameliorative action on oxidative stress and hyperglycemia, however further studies to explore the mechanism of action of possible therapeutic compound in invivo clinical trials will prove beneficial for the advancement of new oral antidiabetic drug.
Therapeutic Alternatives in the Management of Late Complications of Surgery for Isolated Coarctation of the Aorta
Authors: Tabry Imad , Rush Michael
Published: September 2018

Despite initial technical success in the treatment of coarctation of aorta, late recurrence and/or development of aneurysms and pseudoaneurysms frequently prompt reintervention. The authors hereby present such a patient whose management required more than a single intervention to treat his complex anatomy, and they discuss the therapeutic alternatives under similar circumstances.
The future role of psychiatrists in Europe in the light of the European Pact for Mental Health and Well-being
Authors: Caldas de Almeida J. M.
Published: September 2018

The European Pact for Mental Health and Well-being, launched in 2008, expresses a commitment of the EU and Member States to implement a mental health strategy in Europe. Recognizing that the level of mental health and well-being in the population is a key resource for the success of the EU as a knowledge-based society and economy, the Pact concludes that action for mental health and well-being at EU-level needs to be developed by involving policy makers and all relevant stakeholders. Given the specific content of their discipline and the prestige they have in our societies, psychiatrists will certainly have a key role in the development of the strategies proposed by the Pact. The purpose of this paper is to review the background, objectives and outcomes of the European Pact for Mental Health and Well-being, and reflect on the future role of psychiatrists in the light of its implementation.