bluuebunny/crossref_metadata_2025 huggingface dataset:
The Design of Inverted Pendulums as Learning Sources of Adaptive Control
Authors: Baiti A A , Mashoedah  , Zakarijah M , Suprapto  , Ahwan N
Published: December 2019

Inverted Pendulum is a control application which is the basis of science in today‘s technologies such as missiles, aircraft, satellite control, etc. This inverted pendulum receives input then the parameters are determined and the system responds. This research aims to design an inverted pendulum as a source of learning adaptive control. The design process uses the RnD method with phases including requirements analysis, design, implementation, and evaluation. Inverted pendulum design includes mechanical, electronic and source code design.
Automatic Tsunami Early Warning System Based on Open Data of Indonesia Agency for Meteorological, Climatological, and Geophysics
Authors: Atika R , Raditya A E , Marjianto R N , Pramono H S
Published: December 2019

Indonesia frequently experiences earthquakes and tsunami since Indonesia is geologically located in the ring of fire and sits along three major tectonic plates of the world thus this natural phenomena have the potential to continuously occur for example a notable tsunami that hit Aceh in 2004 and killed 160,000 people. This condition is not yet supported by adequate means of disaster mitigation and a tsunami early warning system. The objective of this study was to create an automatic tsunami early warning system that utilizes tsunami potential data from the Indonesian Agency for Meteorological, Climatological and Geophysics’ website to be conveyed through loudspeakers in places of worship whose area will be affected by the tsunami. This study used the Research and Development (RnD) method with the ADDIE (Analyze, Design, Development, Implementation and Evaluate) procedure. This study developed a tsunami early warning system that works effectively with a fast average response time of 13.48 seconds to download tsunami potential information on the BMKG website and proceed it to trigger the loudspeaker at places of worship.
Development of Intelligent Floor Cleaning Robot
Authors: Yatmono S , Khairudin M , Pramono H S , Asmara A
Published: December 2019

Cleaning the floor from dust is one of the routine activities carried out every day. This activity is not only at home but also in offices or shopping centers. Sometimes due to dust cleaning activities take a long time then there are other activities that are overlooked. For this reason, we are trying to develop a smart floor cleaning robot that can navigate, clean dust, and polish floors automatically. The study was conducted using Pressman‘s research and development methods which included the following phases: analysis, design, implementation and testing. The robot, developed using an omniwheel wheel and is equipped with a vacuum cleaner and floor polishing motor. The control system used is based on the Arduino microcontroller, the robot is also equipped with a Bluetooth communication system so that it can be controlled via an Android smartphone. The developed robot is able to move according to navigation controls via an android smartphone. Besides this robot is also able to move to avoid obstacles if the distance between the robot and the barrier is less than 15 cm. Floor cleaning performance on various types of dirt is quite good with only leaving dirt on the floor less than 20%.
Development of Arduino Assisted Microcontroller Instructional Devices in Vocational High Schools
Authors: Wijaya H A , Khairudin M
Published: December 2019

This development research aims to find out: (1) feasibility, (2) functioning, and (3) the effectiveness of the arduino-assisted microcontroller assisted devices with the arduino simulator Xevro version 1.5 as a learning media for the material programming of microcontroller programming skills in Mechatronics Engineering at the Vocational High School. The subjects of this study were the XI grade students of the Mechatronics Engineering expertise program at vocational high schools N 1 Bawang Banjarnegara and Leonardo Klaten Vocational High School. The results of this study are an Arduino-assisted microcontroller simulation for microcontroller programming material. The results of the feasibility assessment of the Arduino-assisted microcontroller simulation according to the validator are 83.33 so that it is categorized as “Very Worthy” and according to students is 70.98 of a scale of 100 so that it is categorized as “Eligible”. The results of the assessment of the function of Arduino-assisted microcontroller simulations according to the validator are 82.92 so that it is categorized as “Very Worthy” and according to students is 71.55 of a scale of 100 so it is categorized as “Eligible”. This Arduino-assisted microcontroller simulation has an effective impact, because the significance value when tested using the t test is t count = 11.075> t table = 1.983 and Asymp. Sig (2-tailed) <0.05. The level of effectiveness can be seen from the magnitude of the gain value.
An Asynchronous Serial Communication Learning Media: Usability Evaluation
Authors: Hariyanto D , Nugraha A C , Asmara A , Liu H
Published: December 2019

The availability of a good acceptable learning media is a vital part of the learning process. This paper presents a usability evaluation of the asynchronous serial communication module, which can exhibit the level of acceptance of Data Communication‘s students. The survey was performed based on ten simple statements of the System Usability Scale (SUS) questionnaire. The research‘s findings have been analyzed in three different approaches, i.e., visual “five-pointed star” shape assessment, Bangor et al. model verification, and curved grading scale justification. The analysis showed that the serial communication module is in the acceptable category.
Nearest Excellent Potential Location Using Distance Algorithm
Authors: Purbaningtyas R , Arizal A
Published: December 2019

This study aims to find the proper distance calculation method that will be applied to the Sidoarjo on Hands (SoH) application. This study was conducted by comparing three distance algorithms namely Euclidean Distance, Manhattan Distance, and Haversine Formula. The results showed that the Euclidean Distance method was the proper method because this method had has the smallest Mean Absolute Deviation (MAD) with 1.71 in amount.
The Development of the myKadera System for Object Vocabulary Mastery for Students with Hearing Impairment Based on Augmented Reality
Authors: Thalib I , Arifin F
Published: December 2019

This study aims to: 1) design appropriate learning media based on Augmented Reality on the introduction of object vocabulary for hearing-impaired students, 2) perform the developed system. This research belongs to research and development (R&D). This developmental research refers to the stages of learning media development by Arief Sadiman, et al and the stages of the development model by Borg & Gall. This research development procedure consists of three major steps that must be passed, namely planning, development and evaluation activities. The result of this Android-based myKadera system development research is that the system has some features provided including audio, sign language videos, 3D animation, and object vocabulary quizzes that were packaged more interestingly, applicative and innovative with a more real-time visual display, supported by object vocabulary learning media books with the help of AR (augmented reality) markers. The results of the test indicate that the application meets ISO/IEC 25010 standards on aspects; (1) functional suitability; all features of the application has been successful and said to be good, which means there are no functions that fail on testing, ( 2) application compatibility; the application is 100% compatible with sub-characteristics of co-existence, various operating systems, and various types of devices used for testing, (3) performance efficiency; the application is successfully run using the AppAchhi test device. The application is said to be good without experiencing memory leak or application damage which results in force close or launch fail. The application shows an average time behavior of 0.063 seconds/thread, an average CPU usage of 20.39%, and average memory usage of 13.08 MB, and (4) usability testing obtained a percentage of 95.50%. These results indicate that the application is very feasible and meets the usability aspect.
Augmented Reality As Android Based Learning Media for Wood Field Laboratory Work
Authors: Wulandari B , Pratama G N I P , Hasanah N , Yuniarti N
Published: December 2019

The objectives of this research were: (1) producing Android-based AR products in the form of a Wood Field Laboratory Work module in Department of Civil and Planning Engineering Education, Faculty of Engineering UNY to facilitate students’ visualization abilities; (2) knowing the quality of Augmented Reality products for the Wood Field Laboratory Work module so that it is suitable for use by students and teaching staff; and (3) addressing the learning problems that have so far been present in the Wood Field Laboratory Work. The method used was the Software Development Life Cycle software development model which was described by the v-model waterfall. The v-model included: (1) the stage of specification of user requirements; (2) system architecture design; (3) designing components; (4) writing program codes; and (5) testing. The test results using ISO 25010 indicated that the application of learning media was stated to be very feasible in functional suitability, compability, and usability aspects. While from the performance efficiency aspect, the application was considered feasible because there was no memory leak on the device that run it, and CPU usage by five different devices reaches 10%, which is still below the safe limit (15%).
Simtenismeja.com Features as an Information System in the Implementation of Table Tennis Matches
Authors: Hertanto D B
Published: December 2019

The application of Information Technology has helped many business processes in various fields. Table tennis as a sport still has many problems. The process of implementing the match up to now still relies heavily on manual methods. The use of computers in the competition is still limited to documentation. Match schedules, match charts and validation of participants are examples of problems that make it difficult for the competition committee. Simtenismeja.com is an application that has been developed to overcome the above problems. This system is based online, so all processes can be done anytime and anywhere using all possible devices. This application has facilities for recording data on participant athletes, preparation of schedules and charts of matches automatically, and recording and publication of results of matches. This system has been implemented in a table tennis match. User responses have been recorded to show whether the system is proven to make it easier to do table tennis matches or not. The response test results state that all buttons, interface pages, and menus can function properly. The next process is comparing the implementation of matches manually with the implementation of matches assisted by simtenismeja.com application. In general the use of applications in matches is much more efficient in terms of time and accuracy.
Visual Speech Recognition for Daily Indonesian Words Based on Combination of Double Difference and Image Projection Method
Authors: Nasuha A , Arifin F , Irmawati D , Hasanah N
Published: December 2019

In visual speech recognition, there are two approaches to lip feature extraction, which are based on appearance and shape. The appearance-based approach is usually better, because it provides visual features that not only include lip structure but also the visibility of the teeth and tongue. However, the disadvantage of this approach is that it produces too many features. Integration of double difference and horizontal-vertical image projection, is part of the appearance approach, in addition to using image projection as dimensional reduction. In previous study, the method has succeeded in recognizing 5 daily indonesian words, with data in form of videos recorded inside the room. In this study, we used the same words with 5 additional new words recorded outside the room. MLP (Multi Layer Perceptron) and SVM (Support Vector Machine) are used as classifiers. The word recognition process is evaluated using 10-fold cross validation. The method tested reached 88.92% on classification accuracy and 0.9948 on AUC (Area Under ROC Curve).
Dynamic Response and Vibration Isolation Analysis of Very Large Floating Building under Wave Action
Authors: Zhang Jian , Wang Xiang , Yuan Pingping , Wang Hanghang
Published: December 2019

Taking the buildings above the very large floating structures as research object, the finite element software ANSYS/AQWA was used to carry out hydrodynamic analysis of the single module very large floating structure, and the motion response parameters were obtained. A common multi-layer steel frame structure model and a multi-layer steel frame structure model with three-dimensional vibration isolation bearings were established by using SAP2000, and dynamic time history analysis was carried out for these two steel frame building models. Studies have shown that the motion response of the very large floating structures under the action of waves can not be ignored for the upper building. After the vibration isolation bearing is added to the floating buildings, the natural vibration period of the upper steel frame structure is significantly extended, the inter-layer shear force is slightly reduced, and the inter-layer shear force, interlayer displacement and floor acceleration are increased. Compared with the installation of vibration isolation bearings for land buildings, the vibration isolation of offshore floating buildings is not effective.
A new formula of Rotational Stiffness Coefficient of pile hinged on top under moment load
Authors: Chen Guozhou , Lin Zhiyong , Lin Wenbin
Published: December 2019

The analysis and design of single piles subjected to lateral load are very important. The traditional expression for calculating rotational stiffness coefficient is too complex, and it needs large amount of computation. This paper proposes a new approach for getting rotational stiffness coefficient of pile hinged on top under moment load. It has been proved that the new method is the equivalent of traditional method of calculating rotational stiffness coefficient using power series. A case study shows that the same answer can be gotten in calculating rotational stiffness coefficient by the two methods. However, a large computational cost can be reduced by the new method.
Confined water quality analysis and assessment of water source in Huan County, Qingyang city
Authors: Hu Aiping , Yang Yang , Liu Wanfeng
Published: December 2019

To understand the quality of confined water in Huan County, Qingyang City and explore whether the water can be directly used as drinking water, this paper carried out the single component evaluation and comprehensive evaluation according to the national standard Sanitary Standard for Drinking Water (GB5749—2006) and Quality Standard for Ground Water (GB/T14848—2017). The result shows that the turbidity, total hardness, total dissolved solids, sulfate, chloride, fluoride and total σ radioactivity of in the single group of the confined water in Huan County, Qingyang City, cannot reach the national standard. In conclusion, based on the water quality analysis report and classification standard of the groundwater quality, the confined water quality of the water source in Huan County is poor, which cannot be directly used as the drinking water.
Engineering risk management of China transnational PPP infrastructure projects
Authors: Ding Xin , Qin Yuge , Chen Chuan
Published: December 2019

With the implementation of One Belt And One Road plan in 2013, Chinese enterprises have gradually increased their investment in transnational PPP infrastructure projects. Due to the difficulty of transnational investment and asymmetric information, the engineering risk factors of transnational PPP infrastructure project investment deserve everyone’s attention. Based on the literature review, this paper identifies the engineering risk factors of current transnational PPP infrastructure projects. Meanwhile, according to the experience of domestic PPP projects allocation and the experience of enterprise interviews, it comes to the engineering risk management focus of Chinese enterprises when they invest in transnational PPP infrastructure projects.
Finite Element Analysis on Earth-rock Cofferdam Behavior during Pumping and Drainage of Foundation Pit
Authors: Deng Yang , He Changhai , Fu Shaojun , Hui Jianwei
Published: December 2019

The drawdown velocity of foundation pit water level in existing projects is mostly determined empirically, and the influence of water level drawdown velocity on the seepage field and stress field in the weir body is not fully considered. The water level change of the foundation pit is an important factor affecting the stability of the cofferdam. Therefore, it is of great practical significance to study the variation law of seepage field and stress-strain field of cofferdam during the pumping process of foundation pit, to accurately judge the stability of cofferdam slope and to formulate reasonable pumping and drainage scheme. Based on the 1th temporary earth-rock cofferdam of Yongning Water Conservancy Project, the nonlinear finite element method is used to calculate the spatial-temporal evolution of seepage field and stress-strain field of earth-rock cofferdam under different drawdown velocity of water level. The overall deformation of the cofferdam, the shear failure and instability characteristics of the slope, and the influence of water level changes on the stability of the cofferdam slope are analysed. The results show that the distribution of unsaturated zone and negative pore pressure zone is basically the same. The excessive water level drawdown velocity is easy to break the balance between the seepage field and the water level fall time, resulting in the rise of saturation line height and the increase of the upper bending rate. The effect of seepage control is weakened, and the stability of the slope is poor. The shear deformation of the cofferdam slope develops from the foot of the slope and extends to the crest of the cofferdam until it runs through. At the same time, local plastic deformation occurs at the foot of the outer stone slag berm, and the maximum deformation transits to the foot of the inner slope. Under the action of seepage force, the stability of the inner slope is always smaller than that of the outer one; the change of water level drawdown velocity is very sensitive to the stability of the slope, when the drawdown velocity is greater than the critical velocity, the stability of the slope decreases sharply. Combined with the characteristics of earth-rock cofferdam, on the basis of satisfying the stability of cofferdam, the drawdown velocity of water level should be controlled within 1.28m/d. The research results of the thesis have reference significance for the selection of pumping speed of foundation pit similar to earth-rock cofferdam.
Dynamic and Static Load Test of PC Composite Box Girder Bridge with Corrugated Steel Web
Authors: Wang Yongwei , Li Lei
Published: December 2019

In order to evaluate the safety of a PC composite box girder bridge with corrugated steel webs, Midas/Civil is used to analyze the bridge. Through dynamic and static load tests, the actual working state, vibration characteristics and dynamic response of the bridge under load are understood. Combined with experimental research and theoretical analysis, the comprehensive evaluation of the bearing capacity and working condition of the bridge is made, which provides reference for the design and maintenance of such bridges.
Application of wireless communication technology in safety monitoring system of Guandi Hydropower Station
Authors: Tao Jiaxiang , Wang Tian , Li Jinwen
Published: December 2019

In the early stage, the monitoring system for No. 4 Adit in Guandi power station is mainly based on manual measurement. Considering the measuring period and safety problems, it needs to be transformed into automatic measurement. At present, there are two mature technologies, one is using fiber grating measurement scheme, and the other adopts wireless communication technology scheme. According to the actual situation of the field, the author finally adopts the wireless communication technology scheme. On the basis of the actual effect of automation system, NANRI GPRS DTU 4100 wireless communication technology is stable and reliable. This technology provides a guarantee for the safe operation of Guandi Hydropower Station.
Risk Assessment of Urban Waterlogging Based on GIS
Authors: Jun Shao
Published: December 2019

In this paper, based on ArcGIS spatial analysis technology, taking Tongshan County as an example, the risk index evaluation model of urban rainstorm waterlogging disaster is established. In the comprehensive risk assessment and regional research, the weight of each risk index is determined by analytic hierarchy process (AHP), and the fuzzy evaluation is applied to the raster data of GIS risk index, so as to realize the data management of risk index, the combination of spatial analysis and visual expression. The results of risk assessment classification and regionalization can provide technical support and decision support for urban waterlogging risk prevention and disaster reduction planning in Tongshan County.
Discussing on Prediction of Local Scour Depth of Bridge Foundation
Authors: Cao Jin , Wei Song , Zhang Yingjie , Chan Huadong , Chen Lingwei
Published: December 2019

Local scour is one of the main factors leading to the failure of bridge foundation. In this paper, the mechanism of local scour and various factors affecting local scour are expounded. Based on the erosion mechanism and influencing factors, several common calculating formulas and prediction methods based on calculation algorithm are analysed. Finally, the shortcomings of existing research are summarized and the possible future research directions are pointed out.
Turbulence Characteristics of Internal Waves in an Improved 3D Numerical Wave Tank
Authors: Yu Zhenzhen , Zhang Lei , Yang Yuxia , Wang Lingling , Wang Ruiling , Zhu Hai
Published: December 2019

A three-dimensional unsteady mathematical model was applied to simulate the generation and propagation of the internal solitary waves in an improved numerical wave tank. The turbulence characteristics of the internal waves were investigated by means of the turbulence model, a concept of a fractional volume of fluid (VOF) was employed to track the internal interface of two-layer water. The effect of irregular topography on turbulence was described by the spatial and temporal distributions of turbulence kinetic energy, its dissipation rate. Simulation results show that the highest values of turbulence kinetic energy and its dissipation rate occur at the interface of two-layer water when waves propagate in both flat and irregular terrains. The values are higher in irregular topography cases than those in flat topography cases, which indicates that the turbulence associated with abrupt topographies is more intensive. The paper provides a reasonable approach for understanding the turbulence characteristics of internal waves in density-stratified waters.
Research on performance of prefabricated bridge joint
Authors: Xie Wentao , Sun Yun , Chang Shan , Qian Jianqi , Yang Ming
Published: December 2019

In this paper, the influence of different parameters such as joint form, joint stiffness and shear key form on the mechanical properties of the joint was analyzed based on an asymmetric simply supported-continuous box girder. The finite element analysis model of the bridge was established by the finite element software MIDAS CIVIL 2017, and the mechanical properties of the whole bridge were analyzed. Based on the general finite element software ABAQUS 2017, the local solid finite element models of the four types of joints, such as C50 concrete wet joint, C80 concrete wet joint, dense key prefabricated assembly joint and sparse key prefabricated assembly joint, were established to study the mechanical properties and feasibility. The results show that the cracking moments of the four types of joints are more than twice of the negative moment of the middle fulcrum section under the most unfavorable state, which meet the requirement of the service performance. The breaking moments of the four types of joints are more than three times of the negative moment of the middle fulcrum section under the most unfavorable state, which meet the requirement of the carrying capacity.
Finite element analysis of double-layer box type modular building
Authors: Zhang Jianfei , Peng Lin , Shi Yijian , Chen Baoguang , Sun Xidong , Liu Chuang
Published: December 2019

Box - type modular building with advantages of quick installation, good comfort, beautiful appearance and convenient turnover, is widely used in construction of temporary construction, business services, holiday villas and other projects. In this paper, a single span double - layer box - type modular building in Shenzhen was taken as an example, using modular building system with a special-shaped corner column and cold-formed thin-walled beam. The finite element software ANSYS was used to calculate the overall structural strength and stiffness, and the stress and displacement calculation results under the control of vertical load and horizontal wind load were respectively given. The results show that under the snow load, the maximum stress of the whole structure is 163.14MPa, which appears in the middle of the second layer top frame purlin. Under the horizontal wind load, the maximum stress of the whole structure appears at the beam-to-column connection panel, and the stress of the first story is more unfavourable than that of the second one. The maximum displacement in the horizontal direction is 10.37mm. The maximum displacement angle between layers is 1/278. The above calculation results all meet the requirements of “Standard for design of steel structures” (GB50017-2017), which can ensure the safety and reliability during normal use. Furthermore, it can provide reference for the design and optimization of multi-storey box buildings.
Experimental study on static and fatigue properties of CFRP reinforced concrete beams
Authors: Zhou Yanqiong , Cui Xian
Published: December 2019

In order to solve the problem that steel corrosion seriously limits the service life of bridges, predecessors put forward the measure of using carbon fiber reinforced composite bar (CFRP) as stress bar. In order to study the static performance, fatigue performance and damage development of CFRP ribs, the static loading test of two mixed reinforced beams with different reinforcement ratios was carried out based on the static load test of pure reinforced concrete beams through three-point concentrated loading. The test results show that the CFRP rib beam works by the development process of balanced crack extension and fiber rupture; the deflection and strain of the test beam increase significantly in the initial stage of cyclic loading; as the number of load cycles increases, the crack growth rate becomes slower. And entering a relatively stable stage of development, and a large increase in the vicinity of the destruction; Under the same reinforcement ratio, the static load limit of composite reinforced beams is 0.95 times of that of pure reinforced concrete beams; the static load limit of 2FRP beams is 50% of that of 3FRP beams, but the fatigue life of 2FRP beams is 75 times of that of 3FRP beams. It can be seen that appropriate reinforcement ratio can effectively improve the service life of specimens. On the basis of the test, some suggestions on the design of CFRP reinforced concrete beams are put forward. The research results can be used for reference in the follow-up study.
Development of an edutainment shaft garden for integrated waste management in the UGM green campus
Authors: Cahyanti Pita Asih Bekti , Widiastuti Kurnia , Agus Cahyono , Noviyani Pipit , Kurniawan Kemas Ridwan
Published: December 2019

Biomass productivity and organic cycles in tropical regions are the highest in the world because of increased temperature, rainfall, humidity, and sunlight year-round. Organic waste not only comes from the agricultural sector (agriculture, horticulture, plantation, forest, livestock, and fisheries), but also from non-agricultural entities (cities, market, offices, households, campuses, industries, and other sectors). Organic waste volume from the integrated campus UGM yard reached 30 tons/day, requiring the support of adequate self-managed waste management facilities. Various experimental approaches were used in designing the Waste Management Centre at UGM as part of an edutainment (education and recreation) program. The problems at the Waste Management Centre included (1) an integrated system of recreational functions in biogas and compost processing; (2) high operational costs; and (3) space efficiency for productivity and processing. Development of a ‘Shaft Garden’ was chosen a solution for (1) creating visual attraction and space experiences from biogas and compost management; (2) utilizing gravitational force as a utility distribution system; and (3) creating a sequence of spaces according to the function. Integrated organic-cycle management by empowering the 9R (Reuse, Reduce, Recycle, Refill, Replace, Repair, Replant, Rebuild, Reward) framework with a multi-function and multi-product approach has provided higher value-addition to environmental, economic, socio-cultural, and health aspects.
Improving nutrients in cattle manure by converting it into biogas sludge and compost
Authors: Pertiwiningrum A , Wuri M A , Setiyana D , Budiarto R , Koranto C A D , Gozan M
Published: December 2019

In recent years livestock sector in Indonesia grows rapidly. As a consequence, organic waste will increase and cause environmental pollution and health problem if it’s not managed. The recycling of cattle manure for agriculture purpose can waste problem. Previous studies have suggested that the use of organic waste as bio-fertilizer is good for soil. The objective of this study was to investigate the difference between untreated and treated cattle manure on their chemical properties, especially nutrient elements. Untreated cattle manure, treated cattle manure by anaerobic digesting and composting were analyzed their chemical properties such as pH value, water and organic content, N-content, P2O5, and K2O concentration. The pH value of fresh cattle manure, buried cattle manure, biogas sludge, and compost were 6.8; 5.4; 6.8; and 6.9 respectively. The C organic content in treated cattle manure decreased as compared to untreated cattle manure. On the other hand, N-content, P2O5, and K2O concentration of treated manure were higher than untreated manure. The highest N-content, P2O5, and K2O concentration were performed by compost from cattle manure.
Application of choice modelling on mangrove forest valuation in West Lombok, Indonesia
Authors: Saptutyningsih Endah , Diswandi Diswandi
Published: December 2019

A mangrove forest in West Nusa Tenggara is one of tourist destination that attracts many local and domestic tourists thanks to their natural beauty. In addition to its natural beauty, this place is also used as mangrove conservation and education-based tourism. However, there were various critical statuses in West Nusa Tenggara which damaged. The critical status is also spread in various regions on the island of Lombok, among others in the area of West Lombok Regency. The loss of mangrove forest occurs was because mangrove forests often are converted in order to generate directly marketable products, such as aquaculture that might lead to massive economic losses for the surrounding community. To make efficient resource allocation choices, decision makers need a framework to estimate the non-use values that might be held by the community for mangrove forest conservation. Non-market valuation techniques can be used for this purpose, by applying a choice modelling (CM), appears to hold some promise because it can be used to model complex situations and to frame choices consistent with ‘real life’ choices. In this paper, a CM method applied for assessing the values that the community and tourists hold for mangrove forest conservation in West Lombok, Indonesia.
Environmental site engineering and integrated bio-cycles management for rehabilitation of degraded tin mining land in tropical ecosystem
Authors: Agus Cahyono , Wulandari Dewi , Cahyanti Pita AB , Bantara Idi , Hutahaean Benny P , Lestari Tri
Published: December 2019

Indonesia is known as the emerald of equator that has high values of natural resources although it also has a huge disaster risk. It is because Indonesia is located in the strategic areas, namely: (i) the equator, (ii) ring of fire, and (iii) earth plates of Eurasian, Pacific & Indo Australia. Mining activities of natural resources in tropical region exposes carbon and heavy metals and thus are the main cause of severe local, regional, and global environmental damage. The change of national economic development from extraction to empowerment of natural resource will facilitate shifting paradigm from red & green economic to blue economic concept that more smart, global, focus, and futuristic. Site engineering on critically degraded land through land preparation, soil amendment & biofertilizer could facilitate a better rehabilitation of mining land and have added value on environment, economy, sociocultural and health aspect. Synergism to genetic engineering using fast-growing species (indigenous and exotic) will improve success rate of land rehabilitation. An integrated bio-cycle management for managing land resources (i.e., soil, water, mineral, air, and microclimate) and biological resources (i.e., fauna, flora, and human) is an important strategy for sustainable productivity in protective tropical ecosystems.
Community behavior study in domestic waste management around the Ciapus River, Babakan Village, Bogor Regency, West Java
Authors: Salampessy M L , Febryano I G
Published: December 2019

Community behaviour is one of the dominant factors affecting the sustainability of the watershed. This study aims to identify community behaviour in the management of domestic waste around the Ciapus river in the Cisadane watershed. This research was conducted in the community in Babakan Village. The research method used is a case study. Collecting data with questionnaires, in-depth interviews and FGDs. Determination of respondents with purposive sampling method for 60 people who live around the river. The collected data were analysed and presented descriptively. The results showed that community behavior in managing waste showed that the community had not carried out good waste management as 100% did not separate wet and dry waste and 100% did not separate organic and inorganic waste, 100% did not have separate trash bins, 100% did not use waste plastic, 80% dispose of domestic waste into the river and 20% still dispose of waste in vacant land, 50% still often do garbage burning, 100% are not pleased reprimand people who dispose of garbage into the river, 80% do not know the government regulations that regulate certain distance limits from rivers that are not permitted to be used, 80% do not know that settlements around the river require special permits and 100% do not know whether there is a ban or not from the village government for settlement or economic activities around this river. This behavior has implications for the disruption of the river’s sustainability function.
Impact of land use and socio-economic changes in water catchment area on total suspended solid (TSS) in Lake Toba
Authors: Harianja A H , Suoth A E , Nazir E , Saragih G S , Fauzi R , Hidayat M Y
Published: December 2019

Changes of socio-economic and land use in the water catchment area are factors that affect the water quality of a lake. This study quantified the impact of socio-economic factors and the dynamics of land covers of Lake Toba water catchment area on the total suspended solid (TSS) parameter, one of the parameters in water quality indicators. Statistical analysis was run by using multiple linear regressions. Parameters observed were TSS, socioeconomic related data and land use in Samosir, Tobasa, Simalungun, Dairi, Humbang Hasundutan and North Tapanuli Regencies in 2008, 2012 and 2016. The results indicated that the water quality of Lake Toba was slightly polluted in 2016 and in 2017. Based on the regression analysis, it was found that some factors significantly affected the concentration of TSS, namely shrubland and dryland farming at 99% confidence level; the number of populations, Location Quotient (LQ) for dry land paddy field and soybean production at 95% confidence level; and settlement land area, geographic population density, LQ for rice and corn production at 90% confidence level. Managing shrubland through a land rehabilitation program and encouraging a rotational cropping system are recommended strategies to manage the increasing TSS in the Lake Toba.
Assigned value determination by expert laboratory consensus on heavy metals proficiency testing of environmental laboratory 2018
Authors: Rahmani R , Masitoh S , Nasution E L , Healthy S
Published: December 2019

Determination of assigned values is an important stage in proficiency testing schemes in accordance with SNI / ISO 17043: 2010. Assigned value is a reference for determining the laboratory performance status in proficiency test participants. One alternative in determining Assigned value is through expert laboratory consensus. This method has an advantage over the reference value method, namely when there is no certificate reference material (CRM) that matches the proficiency test commodity or the corresponding CRM value is not in place. This study was aimed at determining the assigned value of laboratory proficiency testing of heavy metal parameters by employing the expert laboratory consensus method. In this study, the expert laboratory tested were 20 laboratories included the one in the environmental metrology road map. The laboratories have been accredited according to ISO / IEC 17025. Statistical calculations through Algorithm A, and iteration technique were implemented in this procedure. This will make it easier to determine the assigned value because it does not need to be through the reference value calibration of the CRM value. It was found out that the assigned value in mg/L for each metal, i.e Zn, Fe, Mn and Cd were 0.08; 0.4; 0.3 and 0.06 respectively. It was also shown that the assigned value derived from this expert laboratory consensus were not significantly different from the target value, except for Zn metal that differed from the target by 0.01 mg/L. However, it is important to keep reviewing the competence of the expert laboratory on a regular basis to ensure the validity of the values produced.
Regulatory evaluation of waste management institutions in Yogyakarta, Sleman, and Bantul Metropolitan Areas
Authors: Aryantie M H , Hidayat M Y
Published: December 2019

Waste management of single-use plastic bags is a common problem in metropolitan areas, including Yogyakarta, Sleman, and Bantul. It urges the needs to evaluate the existing regulation that decide the most suitable institution to overcome this issue. This research used mixed method. Regulations related to Law No. 18/2008 on Waste Management were inventoried and analysed for determining institutional related keywords. The results of content analysis are related to the volume of waste at Integrated Waste Treatment Area (IWTA) and community participation’s level. Yogyakarta does not instruct specific institutions which are in charge in sorting, collecting, and transporting waste to Temporary Trash Disposal Sites. In contrast, Sleman specifies the institutions, yet it does not include the obligation of the community level. Meanwhile, Bantul clearly regulates institutions at the community level, authority, and budget. Based on the data obtained from Piyungan IWTA, Yogyakarta is the largest contributor of waste (51.02%), followed by Sleman (29.10%) and Bantul (12.79%). However, Bantul has the highest community participation in plastic waste management (93.9%), followed by Yogyakarta (89.7%) and Sleman (88.0%). It is evident that region with the absence of waste management institution tend to generate greater amount of waste, and lower level of community participation.
Comparative study of polymer-based nanocomposites microwave absorption performance in X–band
Authors: Santhosi B V S R N , Ramji K , Rao N B R Mohan , Naidu M K
Published: December 2019

The present work focused on electromagnetic (EM) absorption performance comparison of different polymer nanocomposite structures. Synthesis and fabrication of polymer nanocomposite composed of graphene, polyurethane (PU), epoxy was done using in situ polymerization and resin transfer moulding respectively. The effect of polymer on EM properties of composite was carried out using waveguide measurement technique in X-band. Reflection Loss (RL) and shielding effectiveness (SE) were measured for various nanocomposites using EM wave theory. From the results it is observed that 2.5 wt% of PU/epoxy graphene nanocomposite has shown RL value −35 dB at 12.1 GHz and SE value of −45 dB.
Effect of co-monomer on the adhesive performance of PP-g-MAH between cast polypropylene film and aluminum foil
Authors: Shen Chaoyuan , Xu Shiai
Published: December 2019

Three functionalized polypropylenes (PPs) were successfully prepared for use as the inner adhesive layer of aluminum/polymer laminated film by melt grafting of maleic anhydride (MAH) on PP with styrene (St), diallyl phthalate (DAP) and triallyl isocyanurate (TAIC) as co-monomers, respectively. The effects of these co-monomers (St, DAP and TAIC) on the grafting degree of MAH, gel content, thermal property and adhesive performance of MAH grafted PP (PP-g-MAH) were investigated. The results show that the T-peeling and heat-sealing strengths of TAIC-assisted PP-g-MAH (PP-g-MAH/TAIC) are 28.6 and 70.4 N /15 mm, which are increased by 33.6% and 20.8% compared to DAP-assisted PP-g-MAH (PP-g-MAH/DAP), and by 142.4% and 81.0% compared to St-assisted PP-g-MAH (PP-g-MAH/St), respectively. The grafting degree of MAH reaches a maximum of 2.3 wt% in PP-g-MAH/TAIC, which leads to a higher crystallization temperature than PP-g-MAH/DAP and PP-g-MAH/St. PP-g-MAH/TAIC also has better thermal stability than the other two functionalized PPs, as TAIC can effectively reduce PP chain scission and promote the formation of a cross-linked structure during the melt grafting.
Sympatric wren-warblers partition acoustic signal space and song perch height
Authors: Chitnis Shivam S , Rajan Samyuktha , Krishnan Anand
Published: December 2019

Animals employing acoustic signals, such as birds, must effectively communicate over both background noise and potentially attenuating objects in the environment. To surmount these obstacles, animals evolve species-specific acoustic signals that do not overlap with sources of interference (such as songs of close relatives), and issue these songs from locations that maximize transmission. In multispecies assemblages of birds, the acoustic resource may thus be interspecifically partitioned along multiple axes, including song perch height and signal space. However, very few such studies have focused on open habitats, where differences in sound transmission patterns and limited availability of song perches may drive competition across multiple axes within signal space. Here, we demonstrate acoustic signal space partitioning in four sympatric species of wren-warbler (Cisticolidae, Prinia), in an Indian dry deciduous scrub-grassland habitat. We found that the breeding songs of the four species partition acoustic signal space, resulting in interspecific community organization. Within each species’ signal space, we uncovered different intraspecific patterns in note diversity. Two species partition intraspecific signal space into multiple note types, whereas the other two vary note repetition rate to different extents. Finally, we found that the four species also partition song perch heights, thus exhibiting acoustic niche separation along multiple axes. We hypothesize that divergent song perch heights may be driven by competition for higher singing perches or other ecological factors rather than signal propagation. Acoustic signal partitioning along multiple axes may therefore arise from a combination of diverse ecological processes.
Deep learning-based clustering approaches for bioinformatics
Authors: Karim Md Rezaul , Beyan Oya , Zappa Achille , Costa Ivan G , Rebholz-Schuhmann Dietrich , Cochez Michael , Decker Stefan
Published: December 2019

Clustering is central to many data-driven bioinformatics research and serves a powerful computational method. In particular, clustering helps at analyzing unstructured and high-dimensional data in the form of sequences, expressions, texts and images. Further, clustering is used to gain insights into biological processes in the genomics level, e.g. clustering of gene expressions provides insights on the natural structure inherent in the data, understanding gene functions, cellular processes, subtypes of cells and understanding gene regulations. Subsequently, clustering approaches, including hierarchical, centroid-based, distribution-based, density-based and self-organizing maps, have long been studied and used in classical machine learning settings. In contrast, deep learning (DL)-based representation and feature learning for clustering have not been reviewed and employed extensively. Since the quality of clustering is not only dependent on the distribution of data points but also on the learned representation, deep neural networks can be effective means to transform mappings from a high-dimensional data space into a lower-dimensional feature space, leading to improved clustering results. In this paper, we review state-of-the-art DL-based approaches for cluster analysis that are based on representation learning, which we hope to be useful, particularly for bioinformatics research. Further, we explore in detail the training procedures of DL-based clustering algorithms, point out different clustering quality metrics and evaluate several DL-based approaches on three bioinformatics use cases, including bioimaging, cancer genomics and biomedical text mining. We believe this review and the evaluation results will provide valuable insights and serve a starting point for researchers wanting to apply DL-based unsupervised methods to solve emerging bioinformatics research problems.