bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysing an Optimal Angle in Basketball Free Throw
Authors: Nor-Al-Din Siti Musliha , Shamsuddin Nik Nur Sharina , Noor Khairiah Razali , Sukri Nursyazni Mohamad
Published: November 2021

Basketball is a sport, played worldwide by people of all ages, from young to old. The most important skill that a football player should have is shooting. Shooting the ball into the hoop involves projectile motion. The ability of a player to shoot will determine the scores of his/her team. The angle and initial velocity taken during the shooting, plays a vital role, so that a perfect shooting could be achieved. This work has been conducted to determine the optimal throwing angle and initial velocity that a player should take in order to get the best shooting. The relationship of these factors were investigated: the throwing angle and player’s height, initial velocity with the player’s height, as well as the throwing angles versus time taken for the ball to reach the hoop. Our focus is to maximize the height of the ball, before it is thrown. Newton’s law and the concept of projectile motion were applied using a calculus-based model. Relationship between the player’s height with the initial velocity, optimal throwing angle and time taken for the ball to reach the hoop were discussed. Perfect optimal release angle were determined for thirty data of NBA players. It shows that the player’s height is inversely proportional to the initial velocity and the optimal throwing angle. The obtained results also concluded that the optimal throwing angle is directly proportional to the time taken for a ball to reach its maximum height.
Cubic Curve Fitting Method in Reconstruction of Chinese Calligraphy Outline
Authors: Razali Noor Khairiah Binti , Draman Nur Nabilah Binti Che , Nor-Al-Din Siti Musliha Binti , Sukri Nursyazni Binti Mohamad
Published: November 2021

Curve plays a significant role in CAGD and brings the good impact of computers to manufacturing industries in designing 2 and 3-dimensional shapes and objects. Reconstruction of Chinese calligraphy outline based on the actual character is presented in this paper. Chinese calligraphy is the stylized artistic writings of Chinese characters. It is believed that this writing may help to express the feelings and ideas of the writers, which are difficult to be described. The shapes, smooth lines, and perfect curves are among the important qualities which are particularly emphasized in selecting good Chinese calligraphy. The Cubic B-Spline, Cubic Trigonometric Spline, and Cubic Trigonometric Bezier were used to generate the curves. The factors that have influenced the effects of the curves modifications were examined based on the changes of control polygon and the values of shape parameter. The fastest approach was then chosen by measuring the processing time required to construct the complete design. Results show the Cubic Trigonometric Bezier curve produced the closest curves to the control polygon, accurate to the actual character with λ = 1 and CPU time taken is 2.032 seconds. This is followed by Cubic Trigonometric Spline and Cubic B-Spline.
Aerodynamic investigation on shifted-back vertical stroke plane of flapping wing in forward flight
Authors: Han Jong-Seob , Breitsamter Christian
Published: November 2021

In order to properly understand aerodynamic characteristics in a flapping wing in forward flight, additional aerodynamic parameters apart from those in hover—an inclined stroke plane, a shifted-back stroke plane, and an advance ratio—must be comprehended in advance. This paper deals with the aerodynamic characteristics of a flapping wing in a shifted-back vertical stroke plane in freestream. A scaled-up robotic arm in a water towing tank was used to collect time-varying forces of a model flapping wing, and a semi-empirical quasi-steady aerodynamic model, which can decompose the forces into steady, quasi-steady, and unsteady components, was used to estimate the forces of the model flapping wing. It was found that the shifted-back stroke plane left a part of freestream as a non-perpendicular component, giving rise to a time-course change in the aerodynamic forces during the stroke. This also brought out two quasi-steady components (rotational and added-mass forces) apart from the steady one, even the wing moved with a constant stroke velocity. The aerodynamic model underestimated the actual forces of the model flapping wing even it can cover the increasingly distributed angle of attack of the vertical stroke plane with a blade element theory. The locations of the centers of pressure suggested a greater pressure gradient and an elongated leading-edge vortex along a wingspan than that of the estimation, which may explain the higher actual force in forward flight.
Equilibria and condensates in Rossby and drift wave turbulence
Authors: Skipp Jonathan , Nazarenko Sergey
Published: November 2021

We study the thermodynamic equilibrium spectra of the Charney–Hasegawa–Mima (CHM) equation in its weakly nonlinear limit. In this limit, the equation has three adiabatic invariants, in contrast to the two invariants of the 2D Euler or Gross–Pitaevskii equations, which are examples for comparison. We explore how the third invariant considerably enriches the variety of equilibrium spectra that the CHM system can access. In particular we characterise the singular limits of these spectra in which condensates occur, i.e. a single Fourier mode (or pair of modes) accumulate(s) a macroscopic fraction of the total invariants. We show that these equilibrium condensates provide a simple explanation for the characteristic structures observed in CHM systems of finite size: highly anisotropic zonal flows, large-scale isotropic vortices, and vortices at small scale. We show how these condensates are associated with combinations of negative thermodynamic potentials (e.g. temperature).
Flood debit analysis based on land use: A case of Batang Arau Watershed, Padang
Authors: Utama L , Amrizal  , Berd I , Zuherna
Published: November 2021

A flood may occur for both climatology and human action factors. The climatology factors can be in the form of land degradation, land-use changes, and population increase. The land-use changes can identify when there is a conversion of recharge area into a built area. The conversion may happen because there is potency for a flood area to transform into a place of cities development and settlements. When the population increases, space needed also enlarges. Consequently, the surface flow increase and can cause a flood. Padang - Indonesia, has high rainfall intensity around 3,329 to 4,296 mm/year, which results in a frequent flood. The worst flood occurred on 26 September 2018 and 2 November 2018, which washed away a bridge and caused a 3-meter high puddle. In analyzing those phenomena, this study applied a descriptive qualitative method. The image used in the map was analyzed with Argis X quantum program to get a flood-prone map. The rainfall was calculated by using methods of Thiesen, Gumbel, and Log Pearson III, while the debt calculated using the rational method. The difference debit between these was 42,030m3/second. The results, the amount of land used to discharge was higher than due to the rainfall.
Auditing carbon reduction potential of green concrete using life cycle assessment methodology
Authors: Bhagat G V , Savoikar P P
Published: November 2021

The production of concrete in its traditional form have reported a notable impact on the environment in terms of resource depletion and the carbon footprint it generates in the entire life cycle. To reduce these impacts, the ‘Green Concrete’ concept is at focal point of research in the construction industry. The advantage of resource conservation of ‘Green concrete’s is evident from usage of industrial by-products like fly ash, blast furnace slag, silica fume etc. as alternative binder materials and recycled wastes like construction and demolished waste and other industrial wastes as aggregate fillers. However, the quantification of environmental impact of such concretes in terms of most crucial emissions, like CO2 emissions in an objective way would confirm the eco-friendly face of ‘Green concrete’. Life cycle assessment (LCA) is one of the most trusted tools to arrive at carbon score of such green concrete. This paper presents a step-by-step procedure of estimation of carbon footprint of a green concrete considering all possible phases of the life cycle of concrete including the post use phase. The conclusive findings from available literature for different types of ‘Green concrete’ are also presented to reflect the environmental advantage/disadvantage. The effect of system boundary, carbon uptake and allocation of impact are also discussed with reference to the results available in the literature.
Modelling and Analysis of a Solid Waste Composter for Urban Houses
Authors: Srinivasan Naveen Raj , Chamala Vaishnavi J , Anuja V , Akash Menon S , Devendrán  , Krishnasamy Karunamurthy , Kumar Rajendra , Jebaseelan Davidson
Published: November 2021

Disposal of waste is an important issue faced by sanitation agencies, especially in India, where the volume of waste generated has been increasing rapidly over the last few years. According to the Ministry of Housing and Urban Affairs, as of January 2020, 147,613 metric tonnes (MT) of solid waste is generated per day in the country. Part of the waste that is expunged on a daily basis from homes, is food and other kitchen waste, which are biodegradable or compostable. In rural areas, such waste is disposed of in landfills, such that they get decomposed to form compost that is used as manure for crops. But this is not feasible in large cities where empty land, as well as the time required for waste to get converted into compost, is in short supply. Composting is a proven method to reduce the volume of waste, to almost 15-20% of its original amount. Therefore, this work is focused on designing an electric composter that could decompose waste artificially, and is compact, efficient, odourless, and easy to operate. This product can thus manage biodegradable waste at the source of its generation, and effectively supplant the wastebasket in a kitchen by occupying no greater space than the latter. The yield of compost would also provide nutritive natural fertilizer to homes wherein kitchen gardens or terrace farms have been set up, as well as promote the creation of the same wherever space is available. In this paper, the important parameters involved in the design of composter, including geometry parameters and the ones of operational significance such as speed and number of blades of agitator and bin temperature, have been discussed thoroughly, along with providing an understanding of the processes and considerations necessitated.
Experimental Studies on an Inclined Collector Divergent Chimney Pilot Plant
Authors: Rajamurugu N
Published: November 2021

Renewable energy sources become suitable valid options to reduce the dependency on fossil fuels or petroleum products. The International Renewable Energy Agency reports that the world will harvest 40% of energy from renewable energy sources by 2030. Conventional technologies such as solar PV technology, consumes higher capital per unit (kWh) of electricity generation cost significantly higher than the traditional sources. Hence, solar chimney power generation system can be suitable option for generating low cost energy. Solar chimneys are developed and tested by different researchers in enhancing the performance of the system. Studies on the geometric modifications of the collector, and chimney are limited. The aim of this paper is to analyse the experimental data obtained from a divergent solar chimney. Experimentation is carried under sunlight in an open atmosphere. The airflow rates in the chimneys are tested under different collector outlet height. The experimental results showed that a chimney with higher collector openings was performed well than other models. The computational analysis is also carried out using ANSYS Fluent software package which shows that the collector opening of 2.5m is recommended for higher high mass flow rate and system efficiency.
A Study on Numerical Methodologies in Solving Fluid Flow and Heat Transfer Problems
Authors: Harish S. , Kishorre Annanth V. , Abinash M. , Kannan K.R. , Agarwal Sahil , Mohana N.
Published: November 2021

Numerical methods are described as techniques by which several mathematical problems are formulated, because they may be easily solved with arithmetic operations. These methodologies have a great impact on the current development of finite element theory and other areas. We have given a short study of numerical methodologies applied in fluid flow and heat and mass transfer problems in mechanical engineering which includes finite difference method, Finite element method, Boundary value problems (general), Lattice Boltzmann’s methods, Crank-Nicolsan scheme methods, boundary integral method, Runge-Kutta method, Taylor series method and so on. We have discussed some phenomena taking place in fluids such as surface tension, coning, water scattering, Stokes law, gravity-capillary, and unsteady free-surface flows, swirling, and so on. We have also analyzed boundary value problems on boundary problems, eigenvalue problems and found a numerical way to solve these problems. We have presented different numerical methods applied to different fundamental modeling approaches in heat transfer and the performance of the mechanisms (modes) vary concerning the methods applied. The paper is dedicated to demonstrating how the methods are beneficial in solving real-life heat transfer problems in engineering applications. Results of the parameters like thermal conductivity, energy flux, entropy, temperature, etc. have been compared with the existing methods
Comparison of Numerical Models of Flow and Heat Transfer Through Porous Medium in a Vertical Channel
Authors: Trilok G , Gnanasekaran N
Published: November 2021

Porous medium modelling technique has opened up ways for number of numerical studies to investigate the performance of many devices that involve heat exchanging process. Such modelling technique not only avoids huge cost and time as compared to experimental analysis but also makes computationally less time-consuming as in case of numerical simulation by exact geometry modelling of porous materials. In this regard the present paper analyses two different thermal models namely local thermal equilibrium model and local thermal non equilibrium model along with two different flow models namely Darcy flow model and Darcy extended Forchheimer model. Suitability of the mentioned models in predicting heat transfer through metal foam and wire mesh porous medium is examined subjected to variations in structural aspects of the porous medium that could be primarily represented by variation in porosity and pore density. For this purpose, a vertical channel subjected to constant heat flux capable of housing porous medium reported in literature is numerically modelled and air flow is numerically simulated through the channel. A variety of structural configuration (combination of different porosity and pore density) of the mentioned porous media are considered and among the mentioned flow and thermal models, best suited models for predicting flow and heat transfer through such medium are identified with appropriate justifications. It is revealed from the present study that, Darcy-Forchheimer and LTNE models are best suited to predict flow and heat transfer through porous media than the basic Darcy and LTE models.
CFD investigation on the performance analysis of Tesla turbine
Authors: Kevin Joseph J , Jeyanthinathan R , Harish R
Published: November 2021

A Tesla turbine is a bladeless turbine in which fluid flows in the direction of the centripetal path. It uses fluid properties such as Boundary layer & adhesion of fluid on a series of discs keyed to a shaft. The initial cost and maintenance cost of the Tesla turbine is very low. Our project’s main motive is to improve the performance of a Tesla turbine by changing various parameters such as disc diameter and disc rotating speed through the CFD simulation software using water as a working fluid. The CAD model is designed using Ansys design modeler, meshing is performed using Ansys meshing and post processing is carried out in Ansys fluent. The numerical simulations were carried out using Ansys Fluent which is based on the finite volume method and the changes that occurred in the pressure and velocities are investigated. The parametric study is performed by varying the turbine disc speed. By performing CFD simulations, total pressure contour and velocity magnitude contours are plotted and it is found that pressure and velocity are maximum when the clearance between disc and turbine casing is lesser and at higher turbine disc speeds. The power output of the Tesla turbine is also plotted for various rpm where higher rpm gives maximum power output. The results from the present study would be useful in designing an efficient Tesla turbine with improved performance.
Heat transfer analysis on different pin fin types using Solid Works
Authors: Pant Harshita , Shukla Divyanshi , Rathor Shriya , Senthur Prabu S.
Published: November 2021

A fin is an extended part of an object whose purpose is to raise the rate of heat transfer mainly by convection. The heat flow in any object depends on the surface area, temperature difference, and convection coefficient. As convection coefficient cannot vary after a certain limit and temperature difference depends on the process, the way to increase the rate of heat transfer is to increase surface area which was done by adding fins. In this study, steady-state thermal analysis is performed on different types of fins and fins of different heights by using Solid works simulation. Different materials of fins are also used to verify results as the rate of heat transfer is independent of material. Aluminum 6061 and Copper is used as material for rectangular and cylindrical pin fins. In comparison, rectangular pin fin has a high rate of heat transfer as compared to copper pin fin, and also the rate of heat transfer is directly proportional to the height of the fins irrespective of the profile.
Design and Analysis of Multi-Device Interleaved Boost Converter Driving an Induction Motor
Authors: Latha R , Adharsh Babu S , Vivek Kumar M
Published: November 2021

Electric vehicles are the future of mobility solutions. The electric vehicles are driven by an electric motor with the help of a power electronic interface. The power electronic interface needs to be designed in an efficient way both in mechanical and electrical aspects. This paper proposes the concept of design, simulation and analysis of a 10 kW Multi-Device Interleaved DC-DC Boost Converter (MDIBC) to drive a 4 kW Induction Motor. The motor is driven from the MDIBC through an inverter with SPWM technique. The variation in DC link voltage due to motor is controlled and stabilized to give a constant DC of 400 V. MDIBC consists of semi-controlled switches topology excited by Phase Shifted PWM technique to reduce the ripple current in interleaving inductors. The dual loop control methodology using PI controller is adopted to reduce the ripple in input inductor current and DC link voltage. The open loop simulation and closed loop simulation are done in MATLAB Simulink environment. The simulation results show that the overshoots and steady state error in inductor currents and output voltage are reduced in addition with reduction in current and voltage ripples.
The ‘sense of place’ and the environmental context of Ar-Rahman Mosque architecture
Authors: Bahauddin A
Published: November 2021

This paper main factors are mosque architecture, the theoretical framework of the ‘Sense of Place’, the creation of ‘Sacred Places’, the architectural and cultural heritage of Masjid Ar-Rahman, Kelantan, Malaysia. These factors are based on the Islamic religious understanding, and they are interrelated. The mosque is a sacred important symbol in Islam. The Malay Mosque is medium scale architecture, a humble typology but demonstrates strong cultural and architectural heritage. However, the current mosque architecture is dominated by the monumental domes and towers, the two foreign elements that replace native parts and alter the archipelago official mosque appearances. Hence the lack of local ‘Sense of Place’ and connection to the environment. The conceptual framework capitalizes the research gap found in mosque architecture by further delving into the creation of ‘Sacred Places’ through the ‘Sense of Place’. The Masjid Ar-Rahman of Pulau Gajah, constructed in 2016, demonstrates simplicity both in its traditional image and architectural scale with the Hindu-Buddhist syncretism. It is the value of hybrid assimilation and tolerance and coined as the Nusantara hybridised Malay and Javanese architectural styles and cultural heritage. This research employs qualitative methods of phenomenological and case study propositions supported by architectural evidence in emphasizing the symbolic and semiotic aesthetics aspects in constructing the ‘Sacred Spaces’ through the ‘Sense of Place’. The findings demonstrated that the ‘Sense of Place’ of Masjid Ar-Rahman is created by the simplicity of the mosque design reflected by the Sufistic beliefs and its connection to the environment.
Overview on built environment planning: Residential overhang factors in malaysia affordable housing
Authors: Adzhar S M , Rahim N A , Basrah N , Majid R A , Mustafar S
Published: November 2021

Affordable housing remains a prevalent issue in the country. The definition suggests affordable housing as adequate housing in quality, location, and known as not so costly that prevents its occupants from meeting other essential living needs. In the effort of providing sufficient affordable housing, various affordable housing programs, namely Residensi Wilayah and PR1MA, are currently in the market with the aims to develop and deliver new affordable housing, which targeted the middle-and low-income group. Although the lacking of affordable housing persists, the severe glut in the property market has also records to reach an all-time high. The overhang crisis in the country became an infamous issue in the country with the slow market, which led to the increase in the overhang unit’s statistics year over a year which partially in affordable housing segmentation. It is highlighted that the overhang in affordable housing has shown significant rising despites of its strong demand. This paper attempts to examine the overhang issue in affordable housing in Malaysia and related factors. This research will add up some points of discussion as regards the impact of the Covid-19 Pandemic towards the issue of affordable housing and the strategies in reducing the overhang issue during the pandemic. A review of the past literature related to the topics was carried out and data derived from journals, reports, and websites were gathered and examined to establish the framework on this issue and to identify the overhang factors in affordable housing. The developers are urged to build houses that can cater to the demand of buyers in terms of the property type, location, and also price range. The overhang units did not attract the target market while the product mismatch is one of the contributing factors. Other related factors are affordability, high living costs, and stagnant income growth, cooling measures, financing, unsuitable location, accessibility, the lack of timely and accurate data of buyer’s preference including the shift in demand towards the better-quality project. A study on the overhang factors of affordable housing is needed to resolve the issue, or else, the overhang issue will be worsened and will create a lot of negative impacts in the future. At the end of the research, the list of the property overhang factors and its framework able to be identified and to be used as guidelines and references to the public.
Bustanussalatin Park characteristics as an image shaper of Banda Aceh City
Authors: Auliza M , Wulandari E , Qadri L
Published: November 2021

Imagery is a memory of an event that is re-conveyed through the traces of historical relics or collective memories of society. Bustanussalatin Park is currently a small part of Ghairah Park, which was built by Sultan Iskandar Tsani during the Sultanate of Aceh. Bustanussalatin Park has an area of 2.18 ha which is smaller than before due to the physical development of the city at that time by the Dutch colonial. This paper aims to identify and analyze garden elements (hardscape and softscape) in Bustanussalatin Park and explore public perceptions regarding the characteristics of the current Bustanussalatin park. This study contains public perceptions of the history, extrinsic, and ecological aspects of Bustanussalatin Park as a green open space in providing design recommendations by the image of Banda Aceh City as the city center of the past Islamic empire. The approach of study in the form of qualitative architectural history study is descriptive chronologically. The results show two important things: a) the historical value of the park has not been a major consideration; b) most of the community still wants the presence of Acehnese plant elements, in addition to presenting the needs of public play facilities for now. Recommendations bustanussalatin park design in shaping the image of the city of Banda Aceh by presenting a variety of typical plants of Aceh by the function of the park in the form of protective plants (Jeumpa), directing plants and plants for aesthetics.
Evaluation of air quality in office rooms (case study: the rector’s office building of Syiah Kuala University)
Authors: Farizly H R , Munir A , Sari L H , Zahriah
Published: November 2021

The Rector’s Office Building of Syiah Kuala University is the administrative headquarters at Syiah Kuala University which has a high density schedule. Employees in the building, work for 8 hours a day in the building. Staying in a room for an extended period of time can lead to disease, particularly Sick Building Syndrome (SBS). Poor air quality as a result of air pollution and poor air exchange is the primary cause of SBS. Therefore, it is important to evaluate the air quality in the room to prevent SBS. This research was conducted with a quantitative approach by measuring the physical and chemical quality of the indoor air. The study was conducted on two sample rooms, namely the administration room and the student affairs office. The method of collecting data is descriptive by evaluating based on the regulations of the minister of health and SNI. Air quality is also seen based on the results of room simulations using ANSYS 2019 R3. Based on the results of field measurements, the air quality in the room is not good. Thus, 60% of the employees in the Administration Room and 64.71% of the employees in the Student Affairs Office were infected with SBS.
Built environment and water: Toward a better quality of life
Authors: Rizky S F , Edytia M H A , Zahrah A
Published: November 2021

Covid-19 pandemic reminds us repeatedly of the need to keep clean such as washing hands. This shows that the presence of water in the midst of human activities is important. This article examines what if the element of water is presented naturally in the between human activities: its psychological effects and design. The study was conducted by raising and describing the conditions of settlements in Indonesia which are still in direct contact with the water element and the benefits provided by its existence. Furthermore, the right design to make these water facilities actually have a better impact on the quality of human life will be studied by giving examples of related and similar facilities. These facilities are considered adequate supported by visitor opinions and scientific approach in supporting the prevention of Covid-19 transmission through physical distancing. Studies show that facilities that provide direct access for visitors in contact with water have a better impact and are more attractive to visitors in addition to other existing features.
Understanding Aceh’s contemporary architecture: Neuheun Mandiri Housing, in the hills of Aceh Besar coastal village
Authors: Nursaniah C , Machdar I , Azmeri  , Munir A
Published: November 2021

This paper attempts to examine the uniqueness of architectural culture to show that through regionalism, Acehnese architecture can still be built by saving and adapting regional conceptions of culture and nature. In the design and construction of housing in Aceh today, the territorial approach is rarely considered due to the dominance of universal architectural trends that spread through globalization. The process of building the Neuheun Mandiri housing includes an astute attitude in dealing with the currents of modernity by reinterpreting the architecture of the past to be updated, and making modifications to suit the current environmental conditions. This paper aims to interpret the vernacular aspects of Aceh in the modernity of the housing development of Neuheun Mandiri in the hills of a coastal village, Aceh Besar, where the locality aspect is shown through the building mass pattern, traditional material approaches, and construction techniques.
Potential and limitation of AI system in building services and control management system
Authors: Wong C. H. , Abdul Samad M.H. , Taib N.
Published: November 2021

In the construction industry, traditional method for analysing human comfort is time consuming. Thus, artificial intelligence (AI) has been slowly being applied in the software stimulation and building management system to solve the typical comfort analysis method. The potential and limitation of the AI system in the building service are presented through PRISMA review. The AI system enables the building service system to analysis in real-time, optimising energy efficiency, enhance occupant’s satisfaction, risk mitigation, cost minimisation and work efficiency increased. However, the AI system application in the building service still faces some challenges such as lack of big data and the varying parameter of data input in the software system, expensive initial cost and required expertise.
The emerging green destination: An empirical study of Phatthalung’s value-based identity
Authors: Methanuntakul Kanwipa
Published: November 2021

Regarding as a unique natural wetland where biogeographic region is under Ramsar convention, Phatthalung is also well-known for its iconic natural landmarks and geographical origin. However, the city itself are deemed to be either a short-visit destination or a secondary tourism destination amongst visitors. The aim of this paper is to explore a strategy of green branding on an emerging destination and to identify a value-based identity as a medium of persuasive communication tool. The paper establishes the conceptualization by a thorough case study analysis of Phatthalung’s destination brand from a geographic perspective to deep-rooted characteristic of local people. In order to critically find out the factors which have an effect on eco-tourism driven, the correlation between the influence of place equity and sense-of-place is analytically reviewed. Thus, it is clear that strategic place branding and destination branding play an important role in multidimensional meaning towards Phatthalung’s identity.
A child-friendly design for sustainable urban environment: a case study of Malang city parks
Authors: Nugroho A M
Published: November 2021

A child-friendly city environment contains elements of security, health and comfort, especially in the midst of the current pandemic. This paper aims to study the child-friendly designs in urban public spaces, especially city parks. The study objective was to find the level of performance and importance of child-friendly design in the case study of Indonesian city parks. The research stages include aspects of perceptions and expectations by users as well as development proposals based on expert opinions. Importance Performance Analysis (IPA) technique is used to determine the level of suitability, performance and importance of child-friendly design elements in the case study of city parks. The case study used is Trunojoyo Smart Park, Malang City. Analysis Hierarchy Process (AHP) technique is used for the proposed development of sustainable improvement of child-friendly spaces. The level of suitability of garden elements has the highest value above the average of 116.73%. While the pedestrian path element has the highest performance value and importance with scores of 169 and 156 respectively. The child-friendly design element that has the lowest performance is the sand game vehicle (132). Two child-friendly design elements that become development priorities for both users and experts are safe spaces and play equipment which have a suitability rate of 113.92% and 108.90%, respectively, and the experts’ priority values are 0.117 and 0.083, respectively.
Redefining the role of green open space through the challenge of COVID-19 (Case study: Blang Padang, Banda Aceh)
Authors: Idawati D E , Maisari L , Alidha S Y
Published: November 2021

Under the government regulations to prevent the spread of COVID-19, namely the emergency public activity restriction (micro PPKM), Blang Padang square has experienced a transformation from a large, open, urban space in Banda Aceh full of multi-function activity to only allowing sports activity and vaccine facilities. Therefore, the aim of this study is to explore whether Blang Padang square has fulfilled the necessary functions during a pandemic and to investigate what kind of transformation or adjustment occurred in the space. This study used qualitative descriptive approach with observation, interview and documentation as data collection tools. Shirvani’s criteria of urban open space became the main framework to answer the investigation of this study. The study confirmed that the transformation of Blang Padang square has benefited Banda Aceh residents to continue with a healthy lifestyle during a pandemic and has provided health facilities in a green square.
Perspectives on the implementation of shared space street concept as an alternative to improve the environmental quality in Peunayong area
Authors: Sabila F , Ardesir J , Agustina S
Published: November 2021

Shared space street (3S) is an urban design concept applied by eliminating physical barriers and markers on road space to create uncertainty that will drive motorists to reduce vehicle speed and be more tolerant with other road users. The implementation of 3S contributes to the environmental quality through an emphasis on reducing motorized vehicles, improving people’s habits to walk and use public transportation. This study aims to understand the public’s perspectives about the implementation of 3S as a new concept for an old downtown area in Banda Aceh. This study further examines whether familiarity with the area affects the acceptance of 3S, type of expected facility needs, and confidence of 3S impact to reduce congestion. The study uses the qualitative method (interviews) for key informants and quantitative (online surveys) for the public. The results show that although 3S is a new concept for the area, there is a high level of acceptance from the public. The results also show that frequency of visits does not significantly affect the acceptance, need for facilities, or view on impact to congestion. However, a variety of facility requirements was revealed. It is also found that the combination of several methods in data collection and communicating the proposed design is more effective for the implementation of new urban design innovation.
Open space preference and adaption in creating safe environment in Banda Aceh, Indonesia
Authors: Arafat P , Silvalia M , Sari S
Published: November 2021

Open space has a vast benefit on human well-being and, at the same time serving environmental function. However, COVID 19 pandemics have shifted the pattern of open spaces visitation. This study aims to study visitation patterns to open spaces, evaluate facilities and management of open spaces to ensure visitors’ safety, and explore the COVID adaptive open space models in Banda Aceh during pandemics. This study is mixed-methods research that integrates both quantitative and qualitative data collection and analysis. The participants of this study are the doctors and nurses that worked in the COVID-19 ward in a general hospital in Banda Aceh. These participants were selected because they have sufficient knowledge of COVID-19 and have adapted their lifestyle after working at these special wards. The result shows shifting perceptions and preferences of respondents towards open spaces and the challenge of open space management adaptation during the COVID 19 situations. This paper also explores the safe open space model derived from the research result.
Biodiversity of Rambut Cave Sale Central Java
Authors: Rachmawati S , Matin H H A , Suhardono S , Setyono P , Kusumaningrum L , Rinawati S , Sholiqin M
Published: November 2021

Rembang zone karst area stretches from Central Java to Madura Islands. This area is the most significant water or groundwater basin (CAT) area in Rembang Regency, often known as Watuputih Mountains or Karst Area. Watuputih Groundwater Basin is a karst area that is characterized by the formation of several caves. Rambut Cave is one of the caves in Watuputih area located to the east of Watuputih with coordinate’s point −6.8783, 111.5534. There are seven types of flora found in the Rambut Cave, namely Horseshoe Bats, Bent-Wing Bats, Ants, Geckos and Crickets, Forest Grasshoppers, and Snails. While the flora was found, there are six types of Bauhinia scandens, Suweg, Mahogany, Drypetes littoralis, Yellow Palm, and Teak trees. The study results obtained the Flora Diversity Index Value H=0.687, which belongs to the low category, and the value of Fauna Diversity Index H’=1.414, which belongs to the medium category.
Environmental disclosure on agricultural and mining sector
Authors: Sukirman  , Yaisah U , Hidayah R , Suryandari D , Patrisia D
Published: November 2021

This study aims to understand the environmental disclosure of agricultural and mining companies. Especially the impact of independent are commissioners, leverage ratios, firm size, and liquidity ratios on environmental disclosure. The population is the agricultural and mining sector’s companies in 2014-2019 with 61 companies. Sampling using purposive sampling technique and uses multiple linear regression analysis with SPSS. The results show that firm size, liquidity ratio, and leverage ratio harm environmental disclosure. However, the independent board of commissioners does not affect environmental disclosure. In conclusion, if the leverage ratio, liquidity ratio, and company size are increase, it will reduce the level of environmental disclosure. Hence, agricultural and mining companies in Indonesia have to improve environmental responsibility. Then, the government should make an effective policy for environmental disclosure.
Adequacy measurement of public green open space (GOS) in absorbing carbon dioxide (CO2) emissions from transportation activities in Tampan district, Pekanbaru
Authors: A P Permata MS , Buchori I , Kurniati R
Published: November 2021

Green Open Space (GOS) is one of the efforts to deal with increasing greenhouse gas (GHG) emissions because it can absorb CO2 emissions. Transportation activities cause high CO2 emissions, and the lack of public green open space, which results in the ability of green open space to absorb emissions, is not optimal. The intensity of traffic activity is getting more and more crowded, which will impact the surrounding community. This study aims to determine the level of adequacy of public green open space (GOS) in absorbing carbon dioxide (CO2) emissions from transportation activities. This study uses a literature review approach. The results obtained are the adequacy of public green open space in absorbing emissions from transportation and so that solutions are obtained to carry out policies in reducing air pollution produced by vehicles, and the importance of green open spaces (GOS).
Comparative study between conventional and mechanical technology on fecal sludge treatment plants (FSTP) in Indonesia
Authors: Stevani A M , Soewondo P
Published: November 2021

In pursuit of access to wastewater services to reach the target of 100%, it is undeniable that the non-sewer system/on-site system should continue to be developed. The non-sewer system provides low-cost options, making access to wastewater infrastructure more affordable. As a further treatment of the fecal sludge produced from on-site technology such as septic tank, FSTP (Faecal Sludge Treatment Plant) is needed. This study was conducted on 4 FSTPs in Java Island, namely 2 conventional system FSTPs (Keputih FSTP, Surabaya and Betoyoguci FSTP, Gresik) and 2 mechanical system FSTPs (Duri Kosambi FSTP, Jakarta and Sumur Batu FSTP, Bekasi). The research was conducted by comparing performance indicators which are collection, treatment, human resources, and cost-efficiency, representing development priority aspects. Analysis of the development strategy was carried out by SWOT analysis. Based on performance indicator comparison, Duri Kosambi FSTP has the highest collection efficiency among the others. Treatment efficiency ranging around 60%, and human resources efficiency in all FSTPs ranging at 80%. Duri Kosambi FSTP has an acceptable cost efficiency level, while the rest are still dissatisfactory. Development strategy derived from SWOT analysis should include an effort to do scheduled desludging, partial investment from government, adjusting tariff, and optimizing FSTP capacity.
Solid waste characterization and reducing potential at Faculty of Engineering, University of Surabaya
Authors: Simangunsong T L
Published: November 2021

Reducing solid waste generation is one of the green campus achievement programs at the University of Surabaya (Ubaya). It is essential to determine the quantity and composition of all faculty’s solid waste generation. The Faculty of Engineering significantly contributes to the amount of waste generation in Ubaya. Research related to the Faculty of Engineering solid waste characteristics needs to be conducted. The purposes of the study were estimating the quantity of solid waste generation and observing the composition of solid waste at the Faculty of Engineering. The method of this research was a survey of waste generation. The estimation of waste generation was taken for 12 (twelve) days during April 2018. The study results showed that the average solid waste generation faculty of engineering was to be 19.26 kg/day, and the percentage of solid waste was found to be food waste 27%, plastic 25.8%, food packaging 17.6%, Paper 9.8%, and Residue 19.8%.
Utilization of yellow velvetleaf and water spinach to reduce copper ion in surface water of the estuary of babon river Semarang
Authors: Syahputra B , Nafiah
Published: November 2021

The Babon River in East Semarang has been polluted by heavy metals sourced from industrial waste. So that water pollution at the Babon River estuary does not spread, it is necessary to carry out water treatment. This research uses a glass aquarium reactor and utilizes yellow velvetleaf (limmoncharis Flava) and water spinach (Ipomoea aquatic fork) plants as a medium to reduce the concentration of copper ions (Cu2+) by using variations in detention time. The results and analysis showed that yellow velvetleaf and water spinach could reduce the concentration of copper ions (Cu2+) in estuary surface water within 1 hour, 2 hours, 3 hours, and 5 hours. After going through several stages of a simple drinking water pre-treatment process, the results showed that yellow velvetleaf plants could reduce the concentration of copper ions (Cu2+) in Babon river water samples, from an initial concentration of 0.055 mg/L to 0.020 mg/L, with the highest efficiency percentage reduction up to 61.5%. As for water spinach, the concentration of copper ions that can be reduced only reaches the lowest level of 0.047 mg/L, with the highest percentage reduction efficiency of only 9.6% after the same pre-treatment process.
Integration of renewable energy policies between central and regional governments
Authors: Fajri H , Akmal A D , Saputra B , Wahyuni N , Ilham Q P , Maani K D
Published: November 2021

Renewable Energy will play a more critical role in meeting future energy needs. Therefore, it is necessary to have policies and strategies at the national and regional levels so that the development of renewable energy can increase and develop. Unfortunately, Indonesia does not have a specific policy that covers the development of renewable energy until now. This study aims to see the integration of central and regional policies by targeting the renewable energy mix as a connecting link. This research was conducted using the document analysis method. The study results indicate that the national level’s legal instruments and policies for renewable Energy are inadequate. The instrument is still fragmented into several policies with a minimal portion and legal standing that is not strong enough. We propose the need for policies at the national level that specifically regulate renewable Energy and prepare derivative regulations for the law to have an integrated policy. In addition, local governments must also integrate their regional regulations with existing policy instruments at the national level. Good integration of national and regional policies is expected to accelerate renewable energy development in Indonesia, and the targets are not just ambitions written on paper.
COD removal, decolorization, and energy consumption of electrocoagulation as a wastewater treatment process
Authors: Marlina E , Purwanto P , Sudarno S
Published: November 2021

The efficiency of color and COD removal in wastewater treatment is one of the essential factors. High color removal can encourage the reuse of wastewater as raw material in the recycled paper industry. Electrocoagulation (EC) process is effective pollutant removal in wastewater due to the adsorption, coagulation, and flotation. In this study, recycled paper industrial wastewater was used; this type of waste has a high content of disturbing pollutants, and treatment with electrocoagulation has not been widely carried out for this type of waste. EC treatment has a relatively high level of effectiveness to remove these pollutants; the influential factors studied include initial pH, applied current, supporting electrolyte, and processing time on a laboratory scale. The degradation of color, COD, and energy used was also evaluated. The best color removal was obtained as 100% at 80 minutes of process, and a COD concentration is 147 mg/L, and the energy used is 13.56 kWh/L.
The challenges of Malay Kampung infrastructure as an Old Semarang cultural heritage area
Authors: Rahdriawan M , Wahyono H , Arief S F , Amadeo F , Oktavian A
Published: November 2021

The Malay Kampung is one of four areas of Old Semarang, which are expected to become a good heritage area. However, this area has suffered a lot of damage to the physical environment with limited infrastructure conditions. Therefore, this paper aims to explain the infrastructure challenges of Malay Kampung as a cultural heritage area. The research method used is qualitative with field observations and secondary data collection. Interviews were conducted to clarify field data and the condition of the remaining historical buildings. Based on the field results, we obtained secondary data for planning infrastructure improvements in Dadapsari Village, where Malay Kampung is included in the administration of this village. The study results show that there is still a physical decline in settlement and the environment, tidal flooding, damage to roads and drainage, the presence of inhabitable houses, and the lack of open space. The physical decline has also occurred in several old buildings that have a long history in this area which still receive less attention in this development. The Old Semarang area’s rejuvenation through infrastructure development must still be considered a cultural heritage area. Especially the redevelopment on the rehabilitation of declining cultural heritage buildings.