bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on ultrasonic nondestructive evaluation method for grain size of magnesium alloy components with complex profile
Authors: Li Hongwei , Zhang Rongfan , Zheng Ying , Fu Kang
Published: May 2023

In order to solve the problems of difficult measurement, inaccurate results and serious interference of diffusion and attenuation in the nondestructive evaluation of grain size of magnesium alloy components with complex profile, the sound field models of plane, cylindrical and conical parts based on the multiple Gaussian sound beam method are studied, and the attenuation mechanism of ultrasonic propagation in the medium of complex components and the diffusion and attenuation components in curved test blocks are analyzed, An evaluation method of ultrasonic attenuation of grain size based on diffusion loss correction is proposed to eliminate the influence of complex components on the total amount of ultrasonic attenuation. The results show that the ultrasonic nondestructive evaluation method of grain size based on sound velocity diffusion correction can effectively reduce the system error and improve the accuracy of grain size evaluation of magnesium alloy components with complex profile.
Study on Distribution of Heat Treatment Temperature Field of Long distance Oil and Gas Pipeline with High Steel Grade
Authors: Xu Yan , Liu Yinglai , Yang Fengping , Feng Zhenjun , Bai Qiang , Chang Yonggang , Nie Xianghui , Li Liang
Published: May 2023

In-service welding repair is important to ensure natural gas pipelines’ safe and reliable operation. The temperature distribution in the welding heat treatment process directly affects the pipeline’s bearing capacity and local stress distribution. This study studied the temperature distribution of a high steel pipeline generated by the heat treatment process for the long-term transportation of oil and gas was studied experimentally. The medium frequency induction heating method is applied to heat the tube body by winding a heating belt on the outer wall of the steel pipe to simulate pre-welding and post-welding heat treatment. At the same time, a thermocouple is used to record the temperature change of each position during the whole heating process to obtain data. Through numerical analysis and fitting, the distribution law of the temperature field in the heat treatment process of steel pipe is established to guide the field heating temperature control.
Comparison of Effect of Strong Magnetic Field on Microstructure and Photo Absorption Performance of CaTiO3 and TiO2
Authors: Lin Changxin , Li Qiang
Published: May 2023

The study found that after strong magnetic field treatment of CaTiO3 along with the increase of interplanar distance and lattice constant, the band gap was reduced and the photo absorption performance was improved. The higher the applied magnetic field strength, the smaller the rutile TiO2 lattice is, and the change of magnetic field on the lattice constant is nonlinear. The change before and after 6T is significant, while after the 9T treatment, the light absorption capacity in the violet region can be improved and the effect of strong magnetic field rutile lattice can be largely eliminated by simple heat treatment.
In-situ study on the tensile property and fracture behavior of Cr coating for nuclear fuel cladding
Authors: Qiu Wenjia , Zhong Jingyu , Wang Shuai , Lin Huanyue , Jiang Jishen , Ma Xianfeng
Published: May 2023

It has been suggested that Cr-coated zircaloy is an excellent material for accident-tolerant fuel (ATF) cladding. It is found that Cr coating shows multi-cracking behavior under external load due to its embrittlement. Different fabrication parameters will lead to different crack resistances of the coatings, but the brittle cracking characteristic is common. The estimation of the strength and structural integrity of the fuel cladding depend on the cracking characteristic of the coating. The Cr coating’s tensile characteristic for ATF cladding was examined utilizing the in-situ mechanical testing method. The surface crack initiation, propagation, and fracture process were captured in real time, and the crack density evolution of two different process parameters was compared. The results demonstrate that the first long channel crack occurs at a small strain, then the crack density increases rapidly and gradually reaches saturation with increasing stress. Different fabrication parameters will change the cracking resistance. Compared with the previous sample, the new sample started to crack at a larger strain, the crack density reached saturation faster with a larger saturated crack density, and the crack resistance is inferior. Many small cracks in different directions were observed near the fracture surface. Moreover, there was no interfacial spallation under stress, demonstrating the Cr coating’s excellent interfacial adhesive property.
Research Progress and Improvement Methods of Highly Efficient and Stable Perovskite/Silicon-based Heterojunction Tandem Cells
Authors: Xia Yuyang
Published: May 2023

In recent years, in order to cope with climate and energy issues for green transformation, many countries have successively laid out the solar photovoltaic industry, making the photovoltaic industry the fastest growing industry in the energy sector. Among them, perovskite tandem cells (TSCs) are an important development direction. The stacked cells composed of perovskite top cells (PSCs) and silicon-based heterojunction (HJT) cells currently achieve a maximum photovoltaic conversion efficiency (PCE) of 31.25% and have great potential for development. This paper reviews the research and development process of the perovskite/silicon-based HJT tandem battery, and analyzes the methods to improve its PCE and stability through the research on the structure of the top, bottom and transition layers of the perovskite/silicon-based HJT tandem battery, in order to provide useful information in the industrial development and application.
Improvement of double photon emission Compton imaging using angular and polarization correlations in cascade photons
Authors: Kim Donghwan , Ueki Taisei , Rahman Agus Nur , Yan Linlin , Uenomachi Mizuki , Shimazoe Kenji , Takahashi Hiroyuki
Published: May 2023

A Compton camera is a gamma ray imaging system that produces images by superposing Compton
cones calculated from Compton kinematics. However, the reconstructed images exhibit a high
background. In this study, the angular correlation and polarization correlation were used to
decrease the background. 111In, which emits 171 keV and 245 keV cascade gamma
rays, was imaged using Compton camera modules in the ring structure. The 3D list-mode ordered
subset expectation maximization method was used to reconstruct the images. Probability modeling of
events reflecting angular and polarization correlations was applied to the image-reconstruction
algorithm. The results were compared with those of a typical Compton camera method using only 245 keV Compton cones. The sensitivity of the proposed method was 1.03% of that of the typical
method. However, compared to the typical method, the application of angular and polarization
correlations improved the signal-to-background ratio. The proposed method is expected to be useful
in capturing low-background images wherein a ring-type Compton camera and cascade photon-emitting
nuclides can be used.
Plasma density profile reconstruction of a gas cell for Ionization Induced Laser Wakefield Acceleration
Authors: Filippi F. , Dickson L.T. , Backhouse M. , Forestier-Colleoni P. , Gustafsson C. , Cobo C. , Ballage C. , Dobosz Dufrénoy S. , Löfquist E. , Maynard G. , Murphy C.D. , Najmudin Z. , Panza F. , Persson A. , Scisció M. , Vasilovici O. , Lundh O. , Cros B.
Published: May 2023

Laser-driven plasma wakefields can provide hundreds of MeV electron beam in mm-range distances potentially shrinking the dimension of the actual particle accelerators. The plasma density plays a fundamental role in the control and stability of the acceleration process, which is a key development for the future electron injector proposed by EuPRAXIA.
A gas cell was designed by LPGP and LIDYL teams, with variable length and backing pressure, to confine the gas and tailor the gas density profile before the arrival of the laser. This cell was used during an experimental campaign with the multi TW-class laser at the Lund Laser Centre. Ionization assisted injection in a tailored density profile is used to tune the electron beam properties. During the experiment, we filled the gas cell with hydrogen mixed with different concentration of nitrogen. We also varied the backing pressure of the gas and the geometrical length of the gas cell. We used a transverse probe to acquire shadowgraphic images of the plasma and to measure the plasma electron density.
Methods and results of the analysis with comparisons between shadowgraphic and interferometric images will be discussed.
Development of FPGA-based standalone, portable TDCR system
Authors: Sharma M.K. , Agarwal Shivam , Kulkarni M.S. , Baraiya S.V. , Kulkarni D.B.
Published: May 2023

A standalone, lightweight, portable, FPGA-based triple to double coincidence ratio (TDCR) system is developed. The optical chamber of the system is fabricated in a dual, coaxial cylindrical geometry, with the inner cylinder made up of Teflon and the outer one of aluminium. Three square PMTs, each having an active cathode area of 2.3 cm × 2.3 cm, are housed in the optical chamber. The variation in detection efficiency to identify the optimum kB (ionization quenching parameter) value is achieved by changing the vial position vertically with respect to the centre line of the PMTs. The coincidence analyzer implemented in a field programmable gate array (FPGA) transfers the pulse counts and associated parameters in real time to a Raspberry Pi single board computer (SBC). The TDCR algorithm to compute the efficiency is implemented in the SBC. In addition, the SBC is interfaced with a local 7” touchscreen to provide an intuitive graphical user interface (GUI) for operating the standalone instrument. The system performance is validated with 3H and 14C radionuclide standards.
A renewal approach to configurational entropy in one dimension
Authors: Krapivsky P L , Luck J M
Published: May 2023

We introduce a novel approach, inspired from the theory of renewal processes, to determine the configurational entropy of ensembles of constrained configurations of particles on a one-dimensional lattice. The proposed method can deal with all local rules involving only the lengths of clusters of occupied and empty sites. Within this scope, this method is both more systematic and easier to implement than the transfer-matrix approach. It is illustrated in detail on the k-mer deposition model and on ensembles of trapped Rydberg atoms with blockade range b.
Transition probability and total crossing events in the multi-species asymmetric exclusion process
Authors: de Gier Jan , Mead William , Wheeler Michael
Published: May 2023

We present explicit formulas for total crossing events in the multi-species asymmetric exclusion process (r-ASEP) with underlying

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symmetry. In the case of the two-species TASEP these can be derived using an explicit expression for the general transition probability on

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in terms of a multiple contour integral derived from a nested Bethe ansatz approach. For the general r-ASEP we employ a vertex model approach within which the probability of total crossing can be derived from partial symmetrisation of an explicit high rank rainbow partition function. In the case of r-TASEP, the total crossing probability can be show to reduce to a multiple integral over the product of r determinants. For two-TASEP we additionally derive convenient formulas for cumulative total crossing probabilities using Bernoulli-step initial conditions for particles of type 2 and type 1 respectively.
Acoustical and ventilation performance of school building near airport area in relation to Indoor Environmental Quality (IEQ)
Authors: Gamalia A N , Ekasiwi S N N , Samodra F X T B
Published: May 2023

Buildings that prioritize natural ventilation have problems dealing with airborne noise. The Indoor Environmental Quality (IEQ) disturbance will be considered in the school design located around the airport. As a result, the disorder can cause Sick Building Syndrome (SBS). Thus, the aspect of natural ventilation and noise (acoustics) is a problem that must be compromised. This paper will report the results of measuring the IEQ parameters of ventilation and acoustic, indicated by changes in the ratio of window openings in an elementary school located closest to the airplane runway. The results show that the top-hung type opening with a ratio of the half from the maximum opening produces airflow and noise that still does not meet the IEQ requirements. Hence the aspect of temperature and humidity and CO2 levels still meets the IEQ requirements.
The Thermal Performance of Osing Houses in The Banyuwangi as Humid Tropical References
Authors: Rizka Hablana , Defiana Ima , Noerwasito V.Totok
Published: May 2023

The Osing houses are one of the various traditional architectures in East Java Province, located in Kemiren Village, Banyuwangi Regency at an altitude of 144 meters above sea level, which is included in a low topography with a unique roof, which has three types of structures, namely Tikel Balung, Crocogan, and Baresan. The House of Osing grew from people with all kinds of traditions and took advantage of various local potentials, such as materials, technology, and existing knowledge. However, the local potential, such as the use of lightweight materials, creates problems hot because the thermal properties of lightweight materials are easy to flow thermally, so they can create overheating conditions and affect comfort conditions in buildings. This study aims to the influence of the design of the Osing house on thermal conditions, describes the material behavior of the design elements that affect the thermal performance of the Osing house. The research was conducted using observation and measurement methods. The final results of this study indicate that houses have not been able to provide thermal comfort, especially during the afternoon to evening, when the condition of the building tends to excessive heat.
Zero Energy Building Approach in Design of Biohydrogen Research Centre
Authors: Fathan N , Fitriaty P , Mulyati A
Published: May 2023

The utilisation of natural energy not only can reduce energy consumption in buildings but also can lower carbon emissions from the use of fossil fuel energy for building services. It is believed that with appropriate design and a good attitude of building users, the role of renewable energy in reducing carbon emissions will be maximised. This study proposed the implementation of Zero Energy Buildings (ZEB) concept in the initial stage of building design by considering buildings’ form and façade design in relation to daylighting, natural ventilation and thermal design of buildings, and photovoltaic placement to save energy and to produce electrical energy in the designed building. In this study, ZEB Concept is treated as a secondary consideration in producing the architectural design for Biohydrogen Research Centre. The primary design generator is based on the philosophy of chemical bonds form representing biohydrogen chemical bonds. For a successful implementation of the ZEB concept in the Biohydrogen Research Centre design, both active and passive means are utilised in the building design. For passive means, daylighting and natural ventilation strategies were applied. While for active means, photovoltaic panels were employed as the primary electrical energy generation. Energy demand scenarios were predicted and calculated by the amount of energy used for lighting, air conditioning, and other appliances in the building. The total area needed for photovoltaic installation was obtained by balancing the energy demand prediction with the expected energy generation. The resulting design showed a promising outcome where the building is expected to achieve surplus energy with a total of 845,595.5 kWh electricity per year.
Physical Changes of Occupancy and Spatial of Bajo Tribe Settlement in Jayabakti Village, Pagimana District
Authors: Burhanuddin  , Amar  , Mashuri
Published: May 2023

The Bajo tribe are traditional fishermen whose lives are completely dependent on the sea, they are often referred to as sea nomads or “sea people”. The Bajo Tribe’s house has a characteristic that is located above sea water and all of them have a regular pattern lined up behind perpendicular to the beach. The condition of the settlements of the Bajo tribe in Jayabakti Village is slowly starting to leave the tradition of living on sea water, they have started to build their houses, some are on land and some are above water, and have even built on land. This study aims to examine the physical and spatial changes of housing and identify the factors that influence it. The research method used is inductive-qualitative with a phenomenological approach. The samples taken are 3 (three) houses, each representing a house on land, in land and sea transitions, and a house completely on the water. The results of the study show changes in houses with an increase in area due to an increase in the number of heads of families and an increase in business to increase household income, Changes in the influence of the development of communication tool technology (internet network) which can see materials for housing that can respond to natural conditions, as well as changes caused by relationships social interaction with local communities with the concept of “Bela” (older brother).
A Pattern of Public Open Space Utilization in Tondo I Permanent Resettlement Residential Area (HUNTAP) as Evacuation Space
Authors: Setiawan A , Mardin R , Lutfi  , Baleya F F
Published: May 2023

Learning from the disaster in Palu on September 28, 2018, disaster management in residential areas needs to be facilitated, such as a disaster evacuation or gathering point. This study tries to see the other side of the function of public space as an evacuation shelter in a settlement, with the study case of Huntap I Tondo. This study aims to formulate a pattern of public open space as an evacuation space in Permanent Residential (Huntap) I Tondo. The method is descriptive with field observation of data collection techniques and questionnaires. The stages of the research are 1) conducting spatial analysis to map the location of public open spaces and 2) using the behavioral mapping method and describing it to reveal the spatial pattern created from the reciprocal relationship between humans and space. 3) Distributing questionnaires to determine perceptions and preferences of public open spaces as evacuation spaces. The results obtained the pattern and factors of public open space as an evacuation space in the Huntap I Tondo area are influenced by, (1) the physical aspect of the availability of the nearest public space in the form of environmental roads and open spaces in residential areas. (2) Non-physical aspects include survivors’ and refugees’ social interactions.
Experimental Study of Structural Behavior of Banua Tadulako’s House for Earthquake Survivor of Palu
Authors: Listiawaty H , Hilmansyah T , Basri H
Published: May 2023

Huntap (Permanent dwelling) is a building intended for people whose houses are affected by disasters. The main requirement is that the building be proven to survive if an earthquake occurs around the Permanent dwelling located in the future.

This research begins with the completion of the architectural drawing of the Banua Tadulako’s House (Rumbako) according to input from the Spatial Planning and Settlement Service of Palu City and the Directorate of Housing and Settlement Engineering Development of the Ministry of PUPR. The next process is the preparation of materials and equipment. Structural analysis using SAP 2000 software.

Based on the analysis and simulation results, the following results are obtained: The stresses that occur on the surface of the wall do not exceed the allowable stress of the brick wall infill material, The cross-sectional capacity of the reinforcing steel is quite safe against the combination of loading applied to the structure. The basic seismic shear force of the structure capacity from the pushover analysis is 226 kN. More than the design earthquake force of 121 kN. Minimum connection details and truss structural elements have been calculated and qualify the requirements for strength and stress ratio.
Feasibility Study of Palu Bridge III Structure
Authors: Amir Fatmawati , Maricar Shyama , Mallisa Zet
Published: May 2023

The Palu Earthquake on September 28th, 2018, which was followed by a tsunami and liquefaction, caused massive damage to infrastructure in Palu City and its surroundings, include The Palu III Bridge as an Australian steel truss structure with a span of 2 x 60 m. The need for an evaluation of the post-earthquake bridge structure can be done by Rapid Visual Screening (RVS) method to detect the transverse and longitudinal direction of the bridge, cracks in the concrete structure, failure to steel truss joints, displacement of expansion joints, etc. The degradation of the Palu III Bridge was seen in the expansion joint, massive rust spots in the transverse and longitudinal girders of the bridge, in the area near the east support, the asphalt layer apart, slope of concrete pile foundation and supported rail deflected. The Rapid Visual Screening results of the Palu III Bridge structure can be conclude as follow, the overall condition of the bridge is still in moderate condition, several parts of the bridge should be maintaining and rehabilitating, the bridge pier and abutment area should be cleaned due to a lot of garbage. In general, Palu III Bridge able to function as initial condition.
Study of Liquefaction Potential Using Cone Penetration Test at Balaroa Village Palu
Authors: Azhari Jeehan , Vilda  , Oktaviana Ida Sri , Irdhiani
Published: May 2023

Central Sulawesi Province is one of the areas in Indonesia that is prone to large earthquakes. Balaroa, Petobo, and Sibalaya were among the most fatalities and damaged facilities and infrastructure due to the earthquake on September 28th 2018. Around Balaroa Village, besides the huge damages to Perumnas Housing, the area around the housing was also affected, for example on Jamur, Kelor, and Labu streets, many houses and buildings were damaged. This research aims to assess the potential of the ground in this area to liquefy. Cone Penetration Test (CPT) were conducted at 3 points around Kelor street, and 3 points at Labu street, then the results was used to calculate the Factor of Safety (FS) and Liquefaction Potential Index (LPI). The results indicated that the FS values at each point of the sites obtained on average have an FS value less than 1 which indicates that the area is vulnerable to liquefaction. The results of the analysis of the liquefaction potential index (LPI) value show a range varied from low to high.
Hypocenter Relocation of Local Earthquake using Double Difference Method in Central Sulawesi from BMKG Network Data: Time Periods of July 26 - August 18, 2021
Authors: Jayadi H , Janat N R , Santosa B J , Warnana D D , Nugraha A D , Leopatty H , Asyhar I F , Meidji I U , Fitriana T , Ninasafitri
Published: May 2023

Last July 2021, a destructive earthquake occurred in the northern Ampana area, Central Sulawesi, with the epicenter at sea. We investigated the earthquake and found 101 hypocenter points with a magnitude of 2-6 Mw from 26 July to 18 August 2021 using the BMKG network. Of the 101 earthquakes, we relocated the hypocenter using the multiple difference method and obtained 75 earthquake events resulting from the relocation. The results obtained from the relocation are that several earthquake events with a fixed depth of 10 km have been updated. To validate the results, we used a histogram of travel time results, which depict the relocation results as good, and some close to zero. The results of the hypocenter relocation have a depth of 5 to 30 km and are collected in one location. The shift’s direction and angle from the relocation results show that most of them are in a dominant direction to the north. It is interpreted that the earthquake was caused by force activity caused by the Balantak thrust, which is in the east and has a north direction towards the study site.
Palu II Bridge Traffic Performance
Authors: Labaso Eko Rahmat , Pratama Julian Ilyas
Published: May 2023

Activities encourage people to make movements to meet their needs. Palu II Bridge has an important role to connect two areas in Palu City. Data collection for this study was carried out by surveying traffic volume, side barriers and vehicle speed in the field. The study was conducted for 2 days, on Mondays and Sundays as samples of working days and working holidays starting at 06:30 – 08:30, 11:00 – 13:00 and 17:00 – 19:00. Data The number of vehicles that have been obtained is converted into units of smp/hour. Determination of the class of side barriers and vehicle speed based on survey data that has been obtained. Calculating the capacity according to MKJI (1997) for urban roads based on the data obtained. Based on the results of data analysis, the value of the traffic volume on the Palu II Bridge is 1805 pcu/hour and the capacity value is 2330 pcu/hour. While the value of the degree of saturation is at a value of 0.775 with the level of service in category D. The factors that greatly affect the capacity of the road are the volume of vehicles, environmental conditions found on the road, vehicle speed, direction separator and side barriers.
Analysis of the Effect of Dimensional Variation and Number of Air Inlets on the Efficiency of Gasification Stoves using Computational Fluid Dynamic (CFD) Simulation
Authors: Rezki Rachmad , Suwandi  , Utami Amaliyah Rohsari Indah
Published: May 2023

Nowadays, the consumption of non-renewable energy is high. As a result, the availability of this energy is decreasing. Because of this, other energy alternatives are needed. One example of another option is the use of biomass. An example of using biomass is the gasification process. This process was carried out in a device called a gasification stove, namely a gasifier. A gasifier has been developed to produce an optimal combustion system. The constraints in this development are costs for manufacture and the potential for failure. Therefore, simulations using Ansys Computational Fluid Dynamics (CFD) software student versions were carried out to reduce the costs for manufacture and the potential for failure of the gasifier. The simulation contains dimensional variations and the number of air inlets of gasifier of downdraft gasifier, updraft gasifier, and entrained flow gasifier. Further, the influence of the dimensions and quantity of inlet that affect each design’s efficiency and the temperature was examined. The simulation results show that the best dimensions for the downdraft gasifier, updraft gasifier, and entrained flow gasifier are height and diameter of 50cm; 14.5cm (A1), 144cm; 70cm (C1), and 900cm; 300cm (B3), respectively. The best number of air inlets of A1, C1, and B3 gasifiers is 6, 1, and 6, respectively. Thus, the efficiency of each gasifier A1, C1, and B3 are 11.393%, 9.354%, and 50.885%, respectively. Furthermore, the A1, C1, and B3 gasifiers temperatures were 1055.25 K, 1383.44 K, and 3580.15 K, respectively. Therefore, this study suggested that the gasifier development could be optimized using simulation to reduce manufacturing costs and failures.
The theoretical approach of how to predict the critical rotational speed of the rotating nozzle in flashing purification to increase the evaporation rate
Authors: Sonawan Hery , Halim Abdurrachim , Tandian Nathanael P.
Published: May 2023

We developed a new flashing method in this study to improve the evaporation rate in flashing purification. In this case, a stationary nozzle is replaced by a rotating nozzle during the flashing process. The use of a rotating nozzle may distribute water droplets in previously unreachable spaces; the more droplets, the greater the evaporation rate. The use of a rotating nozzle during flashing causes problems if the rotational speed causes the water droplets to collide. To avoid a collision, a rotating nozzle must rotate at an appropriate rate. The kinematics of drifting water droplets after being sprayed by a rotating nozzle can be used to calculate this speed. It could be calculated by periodically observing droplet movement to determine the critical rotational speed of a rotating nozzle. By studying the trajectories of water droplet movement after being sprayed by a rotating nozzle, we can obtain no droplet collision circumstances. Water droplet evaporation during drifting reduces droplet size, resulting in a lower nozzle rotational speed to avoid a collision. For a water particle diameter of 153.5 µm, the smallest nozzle rotational speed predicted is 85.4 rpm. A droplet with a diameter of 80 µm produces 82 rpm of nozzle rotational speed, while a droplet with a diameter of 40 µm produces 80 rpm of nozzle rotational speed. Evaporation may reduce the size of the water droplets during the flashing process. To avoid droplet collision and increase evaporation rate, finer water droplets require a lower nozzle rotational speed.
Study of Solar Power Plant Efficiency in Remote Village Using HOMER Software: Case Study Kasoloang Bambaira Village, West Sulawesi
Authors: Fatmawati A , Sholihah R M , Syam F , Purnama S , Rahman Y A
Published: May 2023

The electrification ratio of West Sulawesi Province according to electricity statistics in 2020 is 99.72%. 74,342 households do not have PLN electricity, one of which is in Kasoloang Village, Durian Guni Hamlet, Bambaira District, Pasangkayu Regency. So far, they can only enjoy electricity for five hours at night. they use a Generator set. Fueled by gasoline or diesel. On the one hand, the potential for solar radiation in the West Sulawesi region is quite potential to develop solar cell energy (SCE). This study aims to examine the efficiency of SCE in Kasoloang Village using the HOMER application. the next stage is the design of the generator to determine energy requirements and the calculation of the capacity of components (such as solar panels, solar controllers, batteries, and other features). The results showed that the efficiency value of using SCE was higher than that of the generator.
Harvesting of Photon Energy through PV on Building Envelope and Windows Canopy
Authors: Mustofa  , Krisnawan Sang Putu , Hatib Rustan , Iskandar  , Asmeati  , Hariyanto
Published: May 2023

It often does not occur to us that there is a space or point in the construction of a house or residence that has the potential to develop new and renewable energy sources (EBT) that produce additional electrical energy. The position of the window canopies and building walls has the potential to place solar panels (PV) according to the canopy design without requiring additional installation costs. This position is known as passive energy. The advantage is that it is easier to maintain compared to PV panels installed on the roof of the house. Although this position is not optimal to get sunlight, at least there will be photon energy captured by placing PV in the path of the sun’s shadow. This means that the solar thermal value that PV does not like will decrease, while what is needed for PV semiconductors is photon light. Therefore, this study aims to increase profits in terms of construction management of exterior walls and building canopies, especially window roofs. The observation results show that The position of placing the PV panels in one direction of the sun’s shadow, which is on the west side of the building gives better advantages to PV on the building envelope compare with window canopy. The PV output power generated on the building envelope is about 6 Watt, while the window canopies are only around 4 Watt. Need further investigation on different site of the building.
Monitoring PV Output Power in Tropical Climates Under Surface Temperature Distribution Area
Authors: Rahman Y A , Amin N , Masarrang M , Pirade Y , Yunfa N P , Santoso R
Published: May 2023

The performance parameters of a solar panel are influenced by many factors, including the type of panel, area, solar radiation, ambient temperature, and weather. This study aims to analyse the effect of solar radiation and temperature on the performance of monocrystalline solar panels. This research was located in Palu, one of the cities with high temperatures in tropical Indonesia. The study used 50 Wp PV, which was placed in the eastern Palu area based on the spatial distribution of surface temperature with the highest temperature distribution. Data sampling is 25 times per day from 11:00 am – 03:00 pm. The result is that increased surface temperature of the solar panel impacts the decrease in the output power of the PV. The environmental temperature of 32.87 °C in the East Palu area causes a decrease of PV power by 2.3%.
Decision Support System Determining Priority for Road Improvements to Support Sustainable Road Construction
Authors: Hendra S , Ngemba H R , Laila R , Sadik J , Indrajaya M A , Alamsyah  , Hidayah A , Rahmawati S
Published: May 2023

Sustainable transportation is a reflection of the concept of sustainable development in the transportation sector. Sustainable roads protect and augment natural resources and the processes involved. The Department of Public Works, Spatial Planning and Land (PUPRP) of Parigi Moutong Regency is the part responsible for maintaining and repairing roads in Parigi Moutong Regency. The limited budget and the number of roads being managed make the process of determining the priority of road repairs not right on target. This study aims to assist the government in determining road improvement priorities. Therefore, a web-based decision support system for determining road repair priorities was developed. This system was developed using the Weighted Aggregated Sum Product Assessment (WASPAS) method. The results of this study are applications that can help make decisions in determining road repair priorities using the WASPAS method. The results of testing the application using Black Box testing result that all system functions run well and in accordance with the initial design. Furthermore, testing the application using the Delone and McLean Model, the results are very good.
Pertamina Gas Product Information System To Support Green Distribution And Sustainable Logistics Based On Android
Authors: Ngemba Hajra Rasmita , Hendra Syaiful , Azhar Ryfial , Reza Feishall , Masse Fitriyanti Andi , Lakatjinda Adiatma , Sahril
Published: May 2023

Green distribution can be interpreted as an effort to change distribution methods by considering the impact of distribution on the environment. As a company that handles distribution in urban areas, PT. Kalco Patra Energi often encounters several problems in the distribution process, including frequent overstock or excess inventory and stockouts or inventory shortages caused by the distribution activities of Bright Gas products that have not been planned properly. This study aims to assist companies in dealing with frequent distribution problems and how create systems to support Green Distribution and Sustainable Logistics. This research uses DRP (Distribution Requirement Planning) method with an Extreme Programing system development model. Testing using MAPE (Mean Absolute Percentage Error). The results of this study proved that the DRP method could be implemented using previous Pertamina Gas product orders to determine distribution planning in the future. Based on the results of testing the software functionality, the system is running well. Forecasting accuracy testing using the MAPE method produces very good test criteria. Based on the results of testing, user satisfaction with the system shows that user ratings can be categorized as very high.
Medical Assistant Robot With Patient Trajectory Reading Based on Odometry using Photovoltaic source
Authors: Fauzi Rizana , Mustari Aidinal , Lutfiyana
Published: May 2023

Robotics technology is growing and being applied in various fields such as education, industry, household, and health. In the world of health, mobile robots are one of the robotics technologies that can provide solutions to overcome the problem of treatment carried out on patients infected with infectious diseases. With the medical assistant robot, treatment efforts can be carried out by not making direct contact with patients and nurses so that the risk of nurses contracting the disease can be reduced. Mobile robot is one type of robot that can move in all directions. Autonomous mobile robot is a type of robot that is able to move to a destination automatically. By utilizing this robot in health services, it can help several tasks of medical personnel, such as monitoring patients, as a delivery person for medicines, food, and goods. For the implementation of this autonomous mobile robot, a good navigation system and control system algorithm is needed. In this study, the principle of odometry will be implemented in tracking path on a medical assistant robot. In the experiment of adjusting the position of the robot’s motion, it can be seen that the robot can move according to the expected position by adding a PID control to correct the error value in the position of the robot.
Feasibility Of Mangrove Program Implementation as Tsunami Disaster Mitigation In Layana Indah Village, Palu. Central Sulawesi
Authors: Awalia Rezki , Purwaningrum Nurlaila Arumdhani
Published: May 2023

The earthquake that occurred on September 28, 2018 with an earthquake strength of 7.4 at a depth of 10 Km, triggered a tsunami along the coast of Palu city. This condition resulted in several affected areas, one of which Layana Indah Village which is estimated to cause damage and losses after the disaster amounting to 12.6 billion rupiah. This is due to the lack of maximum protection in coastal areas as a coastal barrier as well as the preservation of vegetation on the coast. The purpose of this study was to analyze the feasibility of implementing a mangrove program as a tsunami mitigation measure in Layana Indah Village. The research method used is qualitative by using secondary data, observation and interviews. The analysis technique uses economic valuation analysis with cost mitigation method. The results of this study indicate that the application of structural tsunami mitigation efforts by planting Rhizophora apiculata species is declared feasible because it has a value of 1.5 which means the value of activity >1 based on the results of economic valuation analysis and CBR (cost benefit Ratio).
Implementation of Sustainable Agrotourism for Food Crops Planning in Agricultural Land
Authors: FratikaJulia  , RachmatSaleh  , Khairinrahmat
Published: May 2023

Agricultural land for food crops is a pillar of the economy in an area to increase local revenue, besides that, it is also a source of food crops for the local area. In maintaining agricultural land so that land conversion does not occur, one of the efforts that can be done is through food crops as sustainable agro-tourism. The research location is in the Anja neighborhood, Tawaeli District, Palu City. The purpose of this research is to make the concept and design of agricultural land for food crops to become a sustainable agro-tourism area through architectural design methods. The research method used is the planning and architectural design methodology through a dimensional approach to a comprehensive approach. This is based on the fact that this research interacts thoroughly with many aspects related to the concept and design of agricultural land for food crops as a sustainable agro-tourism area. Based on the analysis of the potential of the area, the results showed that the location of agricultural land for food crops in the Anja neighborhood has a strong attraction as agro-tourism, besides the Anja neighborhood location is very strategic. The facilities and infrastructure owned by agricultural land in the Anja neighborhood can also be maintained in several agro-tourism facilities
Study of Sedimentation Rate at Irrigation Area Baluase Sigi Biromaru Regency as a Watershed Damage Identification
Authors: Andiese V W , Oktavia S R , Amaliah T
Published: May 2023

The high sediment contained in the canals causes changes in the dimensions of the canals. It can reduce the cross-sectional capacity of the canals. The Baluase Irrigation Area is located in Sigi Regency, Central Sulawesi Province, with a functional area of 94 Ha. This study aims to determine the rate of sedimentation in the Baluase Irrigation Secondary canals, which is expressed in the correlation coefficient (R), which is the relationship between Sediment Discharge (Qs) and Water Discharge (Qw). Primary data were collected by direct measurements at the location by measuring canals dimensions, water level, velocity and water samples to test sediment concentration. Sediment samples were taken at 2 distances of flow depth, namely 0.2 h and 0.8 h with 8 cross sections in the longitudinal direction of the canal. From the research results, the average sedimentation rate in the Ramba secondary canal is 3,574 kg/day, while the Baluase secondary canal is 5,675 kg/day. The correlation coefficient (R) value at 0.2 h was 0.6994 and 0.8229 for a depth of 0.8 h. This shows that the relationship between sediment discharge (Qs) and water discharge (Qw) has a positive relationship between 0.6 < R < 1.0
Comparative Study of Sediment Transport using the Caldwell and Cerc Methods at the Donggala Fish Landing Base
Authors: Setiyawan  , Saparudin  , Yunar Alifi , Larasati Gaby
Published: May 2023

Donggala Fish Landing Port (PPI) is a fish port located in Central Sulawesi, precisely in Labuan Bajo Village, Banawa District, Donggala Regency, which is located along the high seas coast. The change in shoreline at the Donggala Fish Landing Base is caused by sediment transport that occurs due to wind and incoming waves. This study aims to determine the sediment characteristics, the amount of longshore sediment transport that occurs per year, and the ratio of the amount of sediment transport for 10 years using the Caldwell method and the CERC method. Analysis of sediment characteristics was carried out by testing carried out in the laboratory with the analyzed parameters, namely: sediment density, sediment grain size distribution and sedimentation velocity. There are many methods that can be used to calculate sediment transport, including the Caldwell method and the CERC method. The results of the sedimentation analysis, it is found that the sediment fraction is sand with various diameters, namely ϕmin = 0.075 mm and ϕmax = 25 mm, sediment density γmin = 2,604 g/cm3 and γmax = 2,678 g/cm3 and sedimentation velocity Wmin = 0.251 m/s and Wmax = 9,946 m/s. From the calculation of sediment transport analysis using the Caldwell method, the maximum amount of sediment transport that occurred in 2009 was 0,956 m3/year and for the CERC method, the maximum amount of sediment transport occurred in 2009 was 0,210 m3/year. The calculation of sediment transport analysis that was reviewed for 10 years, the value obtained by the Caldwell method Qs = 3,353 m3/year, while the CERC method Qs = 0,705 m3/year so that the amount of sediment transport using the Caldwell method is greater than using the CERC method.
Characteristics of Unconfined Aquifer Based on Pumping Test on Wells Made by residents in the Biromaru Area Sigi Regency
Authors: Hamad H , Botjing M U , Supardi N
Published: May 2023

The Biromaru area, located in Sigi Regency, is an agricultural area that was once relies heavily on Gumbasa irrigation in the management of rice fields and farming businesses plant another. Aftermath of the earthquake on September 28, 2018 Gumbasa irrigation canal suffered such severe damage that it could no longer drain the rice fields in the Biromaru area. As a result, most of the people have a livelihood in farming in the fields seeks to carry out independent exploration and exploitation of groundwater. The purpose of this study is to determine the characteristics of unconfined aquifer which includes Transmissivity (T), Storativity (S) and Specific yield (Sy) in the research area. The data collection method used is the pumping test method, long term test and step drawdown test and the analytical method used is the curve-fitting method Neuman, Theis recovery and Hantush Bierschenk for well efficiency performance analysis. Based on the well test and aquifer test as well as lithological correlation results, the Transmissivity value is 315-600 m2/day, Storativity 2.15X10-2 - 6.17X10-3, Specific Yield 1.34X10-1-2.86X10-1, Hydraulic Conductivity 1.19X102-36.4 m/day. and permeability 16,488 m/day. The potential for groundwater discharge in the study area is 226.067 cm3/day. The maximum available discharge is 2.01 X 10-2 m3/s, the value of B = 4.76 X 10-3 and the value of C = 1.8 X 10-5. Aquifer Loss 90.1%, Well Loss 9.9% and Well Efficiency (Ew) 88.3%.
Climate changes affect to The Water avaibility in Sausu Watershed Catchment Area (Case Study)
Authors: Achmad Rachmawaty , Rustiati Nina Bariroh , Sutapa I Wayan
Published: May 2023

Climate change in Indonesia is marked by changes in temperature, rainfall patterns, sea level and climate variability. The climate condition of the Sausu watershed is a natural process that occurs in a rainfall patterns, magnitude and changes in air temperature. This study was conducted to identify the dangers of climate change to the water sector in the Sausu watershed. The analytical method used is Modified Penman evapotranspiration, water balance analysis model F.J. Mock, Makesens, Cumulative Distribution Frequency (CDF) statistical analysis and hazard weighting. This study uses secondary data, namely rainfall sourced from the Sausu rain station in 2002-2021 and climate data (climatology) sourced from BMKG in 2002-2021. Results from this study is that climate change occurs in the Sausu watershed which is characterized by a positive Z value (an increasing trend) and negative (a decreasing trend). A positive Z value (increasing trend) occurs in June, and a negative Z value (declining trend) occurs in December. The danger of decreasing water availability (PKA) occurs in the period 2052-2061 with a low level of danger. Flood hazard occurs in the period 2052-2061 with a high level of danger. Drought hazards occur in the period 2042-2051 and the period 2052-2061 with a low level of danger.
Flexural capacity improvement of the bamboo reinforced concrete beam with perpendicular pivot hooks
Authors: Ummati A M , Michael  , Sarassantika I P E , Fanna G T , Syuhada S , Nasution A P
Published: May 2023

Bamboo as a natural resource is very common used in constructio, such as columns and beams, also can be used as architectural elements. The form of bamboo as a reinforcement is still under identification by many scholars to find an optimum shape and form of bamboo, thus it may be applied as concrete reinforcement since bamboo can improve concrete’s flexural strength. An experimental test conduct in order to identify the role of perpendicular pivot end in bamboo reinforced concrete beams by observing the flexural capacity improvement. Four concrete beams with the dimension of 15 cm x 25 cm x 170 cm were made with 2 cm of square section of the lateral bamboo reinforcement and Ø8 – 100 steel rebar as the shear reinforcement to prohibit the shear failure. The beams were loaded under three-point bending with the point loading in the middle of the span. Based on the experimental result, the beams which equipped by the perpendicular pivot end could improve the load capacity up to 33% higher than the beam without the pivot end. This is proofed that the pivot can improve the flexural capacity of the bamboo reinforced beam and considerable to develop in the bamboo reinforcement beam.