In this paper, we study the bifurcation of periodic solutions for a four-dimensional deployable circular mesh antenna system. The tools for proving these results are the averaging theory and Brouwer degree theory. Based on constructing displacement maps, we study the bifurcation of the periodic solutions of linear center, and to discuss the maximum number of periodic solutions in certain parameter

This study shows the mechanical properties of lightweight concrete (LWC) made by partially replacing ordinary Portland cement (OPC) with class F fly ash (FFA). Natural sand and pumice were used as the fine aggregate and coarse aggregate, respectively. Five LWC mixtures, M1, M2, M3, M4, and M5, were made by replacing, by weight, of 0%, 10%, 20%, 30 %, and 40% OPC with FFA, respectively. The mix proportion

The utilization of fly ash as sand partial replacement in concrete mix is an alternative solution for the depletion of sand resources in the Special Region of Yogyakarta. This research evaluates the effect of sand partial replacement with fly ash to the strength-weight and cost-strength ratio of concrete mixes. The strength-weight ratio was used for mechanical evaluation with higher value considered

At the initiation and design stage, the stakeholders (owners and planners) are faced with the choice to determine which type of pavement will be used in accordance with the budget provided yet they must also consider for the long-life maintenance and the environmental aspect the of the road pavement project. One indicator of an environmentally friendly road pavement project is that it must be low in

Transformation is a total transition process from a form into a new figure which can be interpreted as the final stage of a process where space and time become greatly affect the changes to the ultimate stage. Changes are done by giving the response of the influence of external and internal elements that will lead to a change of shape that has been known previously. The title of “education city” to

Tanjung Emas harbour is one of strategic harbours in Indonesia, which is located in Semarang City. Several problems arise nowadays; the drainage channel capacity decreases due to lack of treatment, rainwater storage reduced, land subsidence and the rise of tide sea level. The flood control used is polder system that classified into several clusters. The research location is focused on the Cluster IV

Value engineering is usually done by substitution of materials or change in construction method. One of them is in The Alton Apartment Project in Tembalang, Semarang, which is apply Korean technology on aluminum formwork system called Kumkang. The objectives of this study are to calculate the coefficient of worker productivity, to find out the time required to install the aluminum form (Kumkang) compared

Many roads are damaged due to heavy tonnage vehicles or because the road foundation is in the form of expansive clay. The rescue effort is to use beach sand (sea sand) for stabilization / repair of road sub-grade in the form of clay. This research using experimental method to carried out by repairing/stabilizing soil clay by mixing beach sand. Sand content varies from 60%, 80%, to 100%. Mixed soil

In the development of marine tourism, two kinds of impacts on the environment will emerge, positive and negative. The positive impacts include: (1) increasing accessibility and economic activities (2) increasing amenities, and (3) creating attractions. The negative impacts include: (1) pollution of the environment, change the quality of the environment. (2) change the original shape of the Marine tourism

This research was conducted to see the rate of sediment transport in the Krueng Meureubo watershed in Padang Mancang Village, Kaway XVI Subdistrict, West Aceh Regency, where in this village floods often occur due to overflowing of the river, which is predicted to occur due to river silting. The ability of the river to accommodate the flow at the time of flood discharge decreases due to siltation caused

Public Private Partnership (PPP) scheme has been used throughout the world as an effective tool to fill the gap between the surge in infrastructure development needs and the shrinking of public fiscal budget. The Ministry of Public Works and Housing 2030’s vision is focused on the construction of infrastructure. The state budget related to road infrastructure development around Rp 1.796 trillion but

Municipal solid waste production is increasing in all conservation destination in Indonesia, as the world’s second biggest plastic waste contributor to the oceans. Thus, the environmental management is needed to evaluate and create the future plan to overcome this problem, one of them is the Eco-village. A successful Eco-village is in Kamikatsu (Japan), where the society is well-educated about the

Industry symbiosis is an environmental management approach that is part of industrial ecology. Industrial symbiosis requires a measurement tool that can measure intangible flows or non-physical flow. Creating industrial symbiosis at industrial estate can be done by uncovering industrial symbiosis, which is seeing the opportunity of material, energy, by product or water change. The potential flow of

The main objective of this article is to discusses curriculum reconstruction for education and training in the electrical engineering field on building construction work. The curriculum review process is intended to meet the requirements of industrial construction and enhance the employability of students to do the job in electrical engineering field. The method used is Dacum (Developing a Curriculum)

This paper focuses on optimizing truss structures while propose best PSO variants. Truss optimization is one way to make the design efficient. There are three types of optimization, size optimization, shape optimization, and topology optimization. By combining size, shape and topology optimization, we can obtain the most efficient structure. Metaheuristics have the ability to solve this problem. Particle

The palm oil clinkers has a high silica content to use in high strength concrete mixtures as additives. In the study to replace silica fume used fly ash which is made from the palm clinkres and mashing then filtered with a No. #200 sieve. The study used a tested beam with 15 × 30 × 220 cm sized with concrete strength design (f’c) 60 MPa and (w/c) is 0.25. The main reinforced used 15.8 mm diameter with

This research aims to analyze and estimate the amount of marine litter which get into seawater intake of PT Trans-Pacific Petrochemical Indonesia (TPPI) Tuban in existing conditions during west monsoon and east monsoon. Ten designs will be simulated to reduce and trap the marine debris entering the seawater intake (SWI). These designs will be tested for their effectiveness in reducing the number of

Scour or landslide is a problem that occurs at river bends. Many methods are used for scouring or landslide protection. One of the protections for scouring construction is crib model by using gabions and current-aligning bamboo. The purpose of this study is to determine of the effect of variations in the placement of the crib by using of gabions model and the current-aligning bamboo on the river bends

Research on wave forces attacking a vertical structure has been conducted worldwide. Morison’s equation commonly used to describe the phenomenon of the action for offshore structures, while for nearshore structures Goda’s equation is more reliable. Wave impact on vertical breakwaters is dangerous for vertical structures, both for walls and columns. Wave pressure distinguished for wave crest and wave

A systematic approach of optimization is needed to achieve an optimal design of large and complex truss structures. In the last three decades, several researchers have developed and applied various metaheuristic optimization methods to the design of truss structures. This paper investigates a new metaheuristic algorithm called symbiotic organisms search (SOS) for member sizing optimization of relatively

Risk prevention using risk management is a process of identifying, measuring, ascertaining risk and developing strategies to manage risk. The purpose of this study was to determine the factors that influence the cost and time on the structure work of The Alton Apartment Development Project. The process is carried out through the identification stage, the analysis phase, and the risk response stage

A concrete structure reinforced with reinforcing bars formed an important part on current infrastructures. The high compressive strength of concrete combined with a high tensile strength of steel give an ideal composite material which offer a wide range of application within civil engineering structures. The aim of this research is to observe the corrosion process on reinforcing bars of reinforced

Green City Index as a reference to measure environmental performance and improve environmental quality. The growth and development of cities raises environmental problems, especially for cities that have strong connections to the capital of Indonesia such as Depok City. This study aims to obtain the value of environmental performance in the city of Depok with quantitative methods based on the Green

Organisational commitment has a significant role in enforcing the employee performance. Since 2014, Infrastructure Project Acceleration was declared by the Central Government. The study was conducted to provide an overview of organizational commitment and employee performance to see the relationship between the two more clearly. Analysis of the data used in this study is processing the results of the

Concrete is the most used material in infrastructure development, especially in a developing country. The concrete used in project must not only satisfy the desired concrete strength, but also the workability. Additionally, due to different conditions in construction projects, the requirement for workability varies. Workability can be measured using several methods. Previously, traditional trial-and-error

Level crossings between railway and highway causes transportation problems in the form of traffic jams and accidents. The Manahan Flyover development in the Surakarta city is an effort to minimize transportation problems in the Manahan and Kota Barat areas. Field condition shows that traffic congestion in the Manahan Flyover can be minimized, but traffic accident rate is increasing. Within nine months

Reinforced concrete structure has very sensitive behaviour with the impact of seawater content. This work will describe about the effect of seawater content on the shear strength of reinforced concrete beams. Previous research focused on studying effect of seawater content on compression strength, tensile strength, flexure strength, and bond strength in concrete. A review of shear failures conducted

High population growth causes an increase in community mobility to meet their travel needs. This has an impact on the use of private vehicles that are not controlled, which is causing transportation problems. The solution to the transportation problem is to use public transportation as a mode of travel. The government is obliged to provide adequate public transportation so that people switch from using

The aim of study is to know about shape, specification, strength, and reduction bamboo reinforced concrete cost construction percentage against reinforced concrete. This study was conducted with a comparative quantitative method. The comparison examined includes cost reduction that occur when using bamboo. Study was using one of bamboo species called Bambusa Vulgaris which has great growth potential

Changes in land use that are not in harmony with the growth in the number of vehicles cause congestion and decrease in the speed of travel. Toll road access is one of the important ways to decrease traffic jams in cities that require smooth traffic flow. The purpose of this study is to analyze the level of service level of toll road access to land use changes from residential environments to commercial

Government plans to build Semarang Harbor Toll road that connects Kaliwungu, West Semarang-Ahmad Yani Airport, North Semarang, Tanjung Emas Port, and Kaligawe to unravel congestion on existing roads where current conditions are not yet available integrated public transportation, this is indicated by high volume of traffic 3,949 pce/hour with a VCR value of 1.25. This study aims to analyze travel time

Research on infrastructure service satisfaction index, the direction of infrastructure development at the village level, and utilization of villages funds is still very minimal. The direction for the utilization of villages funds, in general, has been regulated in legislation, but there is no reference yet regarding the type of infrastructure that needs to be built in the villages, even though the

The declination of environmental quality triggers several harmful impacts on society, such as the increasing of water-borne diseases, low quality of health, and lousy habitat ecosystem. The research aims to conduct a vulnerability assessment method of a watershed and to perform stormwater management to increase the catchment performance due to dynamic changes. The observation focused on Sugutamu sub-catchment

The research location is located in the village of Pahandut Seberang as a new village developed by Pahandut Village. Pahandut Seberang Village has vacant land in the form of forests and swamps that have not yet been developed as one of the potential development areas. Identification of a new green open space potential area is using figure ground analysis and history of place analysis. The purpose of

The biodrying process of solid waste is an approach to the use of biomass energy, where solid waste is dried using the heat generated from aerobic degradation of organic matter. Temperature profile and cumulation of the solid waste biodrying process are the success factors in drying solid waste. The reactor used is made of plywood with dimensions of (30 × 30 × 100) cm equipped with a heat sink using

Sustainable construction is expected to create a quality environment so that environmental sustainability is maintained. The use of coal as fuel for PLTU have a negative impact on the environment, because it produces waste in the form of fly ash and bottom ash. Lokan freshwater is widely used as a food ingredient. This research study a mixture of AC-WC asphalt using coal fly ash and lokan shell ash

Concrete is one of the most used materials in buildings today; yet, predicting the accurate concrete compressive strength remains challenging because of the highly complex relationship between its mixture. An accurate method of predicting concrete compressive strength can provide a significant advantage to the construction material industry, particularly within the concrete material industry. Many

Cilacap is one of the regions in Indonesia in the southern coastal region bordering the Indonesian Ocean. In the coastal areas of Cilacap including Kawunganten district, there are frequent floods due to sea level rise. Tidal flood problem in Cilacap can be overcome by constructing a moveable dam. The selection of moveable dam gateis needed so that it can be work optimally. Data in this study were obtained

The law states that every activity centre, settlement and infrastructure development plan that causes disturbance to safety, order and smoothness of traffic and road transport must be carried out traffic impacts analysis. The magnitude of traffic impact that occurs due to the building construction is influenced by the amount of trip generation and attraction that generated by the building activities

This study focuses on the use of computational model in the design of a breakwater structure, which aims to determine the propagation pattern of the long-term ocean waves, in order to understand their propagation from the deep waters, and to determine the distribution of their energy around a proposed breakwater construction site. The method used is computational simulation of the wave model using

A portable fume hood design with an acid pollution absorber filter was prepared. This study aims to: (1) make a portable fume hood equipped with an acid contaminant absorbent filter housing, and (2) determine the length of time the ability of the lime granule can function as an acid contaminant absorbent filter. This study is a quasi-experimental study using posttest only with control group design

This study is motivated by the tsunami event caused by Mount Anak Krakatau flank collapse on 22 nd December 2018 which affected vital areas in Southern Sumatera and Western Java. A tsunami simulation will be carried out by using a 2D Non-Linear Shallow Water Equation Model to estimate the volume of the initial source as well as their tsunami mode at shores. Various scenarios of initial water volume

While sustainable green infrastructure research has progressed substantially in the last decade, there has been a lack of study mapping on the developments of existing research publications in this area. This research aims to systematically review and map the development of existing publications during the period of 2009 – 2019 using the Scientometric review approach of Scopus metadata and VOSviewer

Concrete is commonly used as the main component in a building. Concrete is obtained by mixing Portland cement, water, aggregates, and sometimes added ingredients at certain comparisons in the form of chemicals, fibrous materials, and non-chemical materials. Utilization of glass powder waste for concrete mixtures is now being developed. This research was conducted to determine the optimum composition

Soft and expansive clay is a soil type mostly found in Indonesia. Cement addition is one of the treatments common applied in soft clay improvement. However, its utilization requires to be controlled considering the effect to environment. Bamboo is a very abundant natural resource. On the other hand, bamboo leaf still requires attention in terms of management and utilization. In the form of ash, bamboo

Humans activities can not separate from transportation. In the remote area, one of the favourite types of conventional water transportation was Passage Boat. However, this transportation less pays attention to the safety factor and the facility. The research location in Jabon Subdistrict, Sidoarjo, where many people identified falling into the river in 2019. To reduce the number of accidents, it requires

All papers published in this volume of Journal of Physics: Conference Series have been peer reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing. □ Type of peer review: Single-blind / Double-blind / Triple-blind / Open / Other (please describe) Double-blind

This study aims to stabilize expansive soil with RHA by 0%, 3%, 6% and 9%. The index properties test with existing soil included lean clay (CL). The existing soil was repaired by adding stabilizing material in the form of RHA as an added material. Based on the specific gravity test, it can be concluded that the addition of RHA reduced the value of specific gravity, made the plastic limit (PL), liquid

Global warming causes climate change with extreme intensity, and other impacts are rising sea levels along with increasing global temperature variability. The research problem located at a remote area in Sidoarjo Regency, East Java Province Indonesia. On December 06, 2017, dozens of houses flooded as high as 60 to 70 cm, resulting in losses of 5 billion rupiahs. Then, it needs to conduct research and

The aim of this research is to investigate the influence of bamboo fiber on the mechanical properties of high strength concrete. The fiber was taken 0%, 0.5%, 1% and 1.5% against the weight of cement. The mix design conducted using weight comparison method. The test carried out at 28 and 56 days. The compressive and tensile strength test 28 days showed concrete obtained an average value of 62.47 MPa

Studies on structure design optimization have been conducted extensively over the past decades because it can increase structural efficiency and maximize the engineers’ profit. One of the significant current discussions is the reliability aspect of structure design in addition to optimal design. This problem becomes more important especially in sizing and shaping optimization of truss structures. To

One of the most commonly used materials in civil engineering is concrete; not only is it cheap and strong, but it is also efficient and convenient. The efficiency of concrete is based on the easiness to place and to compact, which is usually known as workability. However, concrete strength and workability works in different ways; hence it is important to divide concrete into two groups: concrete with

Global warming has impacted the sea-level rise. Then it caused the Rob flooding in coastal areas. The research location is in Rob floods area in Tegalsari Hamlet, Jabon Subdistrict, Sidoarjo that have damaged seaweed cultivation, and estimated losses reached 5 billion rupiahs in early 2018. Therefore, it needs to do research numerical hydrodynamic models to prevent this flood. However, the devices

A new breakwater is on demand to replace the function of an existing steel sheet pile cellular-cofferdam at TPPI Tuban Port of East Java. The existing breakwater has been partially damaged due to severe corrosion and hard attack by monsoon waves. An open frame structure of spun pile vertical-wall breakwater is proposed as an alternative design. The spun pile is a pre-stressed concrete hollow cylinder

Several waste materials have been continuously investigated for possible use as substitutes for materials in the field of civil engineering; one of them is plastic waste, due to the fact that plastic waste is simultaneously increasing. In this study, the block paving was made from recycled plastic bag (LDPE) with the addition of stone ash from stone crusher process waste for the value of 0%; 2.5%,

BPPT-lock was developed by the Agency for The Assessment and Application of Technology (BPPT) and was awarded patent in 2012. The hydraulic stability (K D ) of BPPT-lock armor unit was compared to Tetrapod, Dolos and Xbloc armor units. The results indicate that, BPPT-lock performs far better K D in comparison to each of these armor units. A comparative analysis on the economical use of material was

On behalf of the Editors, it is our great pleasure to accept many research papers on the latest development in infrastructure studies during International Conference on Sustainable Infrastructure 2019 (ICSI 2019). The major goal of the conference, which was organized by Department of Civil Engineering and Planning, Yogyakarta State University is to bring academic scientists, engineers, industry researchers

The purpose of combined reinforcement installation is to direct the water flow and to reduce the scour process in order to protect the riverbank. The study was conducted by employing a laboratory model using a trapezoidal flume/channel with dimensions of 0.8 m width and 0.5 m height. The length of river bend model was 5 m. Observation was made with a constant flow rate of 7.07 liters/second. Tetrapod

Breakwater is a structure to protect waters from wave interference. The structure separates the port basin from the open sea, so that sea waves will not enter the basin. In applying for deep water conditions, floating breakwater is more efficient than conventional types, because it requires less material. Floating breakwater is suitable for soft soils where the strength of the soil is low; and is also

Muddy floods often occur in Indonesia as a side effect of urban development. Flood and sediment control facilities have been so far developed separately. Flood is controlled by reservoirs, while sediment is trapped by checkdam. The objective of this paper is to develop an integrated system between flood control and sediment trap analytically. The system consists of detention pond equipped with perforated