bluuebunny/crossref_metadata_2025 huggingface dataset:
Radioembolization in the Office-Based Lab
Authors: St Amour Edgar D.
Published: April 2021

Interventional procedures have been performed on an outpatient basis in the hospital setting for many years, although there has been a clear trend toward performing these procedures in an outpatient facility, such as an ambulatory surgery center or office-based lab. And while this trend initially began with dialysis interventions and then endovascular interventions, interventional oncology is starting to catch on. Radioembolization has routinely been performed in an outpatient setting, and has recently gained traction in office-based labs due to new reimbursement codes, which became available in 2017. This article will outline the safety and feasibility, including economic considerations and demonstrated growth, of performing radioembolization in an office-based lab.
Fast Ewald summation for electrostatic potentials with arbitrary periodicity
Authors: Shamshirgar D. S. , Bagge J. , Tornberg A.-K.
Published: April 2021

A unified treatment for the fast and spectrally accurate evaluation of electrostatic potentials with periodic boundary conditions in any or none of the three spatial dimensions is presented. Ewald decomposition is used to split the problem into real-space and Fourier-space parts, and the Fast Fourier Transform (FFT)-based Spectral Ewald (SE) method is used to accelerate computation of the latter, yielding the total runtime O(N⁡log(N)) for N sources. A key component is a new FFT-based solution technique for the free-space Poisson problem. The computational cost is further reduced by a new adaptive FFT for the doubly and singly periodic cases, allowing for different local upsampling factors. The SE method is most efficient in the triply periodic case where the cost of computing FFTs is the lowest, whereas the rest of the algorithm is essentially independent of periodicity. We show that removing periodic boundary conditions from one or two directions out of three will only moderately increase the total runtime, and in the free-space case, the runtime is around four times that of the triply periodic case. The Gaussian window function previously used in the SE method is compared with a new piecewise polynomial approximation of the Kaiser–Bessel window, which further reduces the runtime. We present error estimates and a parameter selection scheme for all parameters of the method, including a new estimate for the shape parameter of the Kaiser–Bessel window. Finally, we consider methods for force computation and compare the runtime of the SE method with that of the fast multipole method.
Experimental study of horizontal heated buoyant jets in a linearly stratified ambience
Authors: Chen Yanan , He Zhiguo , Lou Yingzhong , Zhang Han , Zhu Rui , Okon Samuel Ukpong
Published: April 2021

Horizontal warm buoyant jets injecting into a linearly stratified ambience are common in lakes, estuaries, and oceans. Dynamic features and potential surface temperature signatures of heated buoyant jets are experimentally investigated using particle image velocimetry and an infrared camera. Results reveal that when heated jets are completely underwater, the flow evolution can be classified into the horizontal regime, ascending regime, and collapsing regime, respectively. The maximum rise height and the neutral height both increase linearly with the increasing jet length scale. Based on this relationship, an equation is developed to predict the surface impingement of a horizontal heated buoyant jet. If the surface impingement occurs, staggered vortexes and large meanders caused by mixing between the jet and the free surface are observed on the surface temperature maps. Furthermore, surface temperature fluctuation fields are decomposed using the Karhunen-Loeve method, the first four eigenmodes appear to capture the root mean square temperature fluctuations and the features correlated with the swirling vortexes. In the turbulent kinetic energy budget, mean-flow convection is found to be mainly balanced by turbulent transport. As the heated jet propagates downstream, more kinetic energy is transferred into potential energy rather than into turbulent energy.
About a fundamental uncertainty of the contact angle of the catalyst drop on the top of the nanowire
Authors: Nebol'sin Valery , Levchenko Elena V. , Swaikat Nada , Yuryev Vladimir
Published: April 2021

In this paper, we aim to explain a fundamental uncertainty of the contact angle of the drops catalyzing vapor–liquid–solid growth of semiconductor nanowires (NWs). We developed the concepts about the crystallization processes occurring near the triple-phase boundary as well as the conditions of equilibrium wetting of NW top surface singular with a catalyst liquid drop characterized by the NW contact angle. We demonstrated that due to either dissolution of the crystallizable substance or its precipitation from the liquid catalyst drop on the NW tip, the wetting perimeter of the drop is not fixed and the drop can take an equilibrium shape with the NW contact angle, which does not satisfy Young's equation. The NW contact angle corresponds to the indifferent equilibrium of the catalyst droplet because of the wetting hysteresis. We proposed that the fundamental uncertainty of the NW contact angle of the catalyst drop saturated with a crystallizable substance at the NW tip is a result of the interaction of two opposing competing processes: the spheroidization of the catalytic liquid during the gravity neutralization and the wetting. We concluded that the steady-state NW contact angle of the drop depends on the free surface energies of the solid/liquid and liquid/vapor phase boundaries but does not depend on the free surface energy of the vertical sidewalls of the NWs. In this paper, we also proposed a new method to find the free surface energies of phase boundaries by the shape of the catalyst droplet on the NW tip as well as on the substrate. The paper also presents the results of obtaining the interphase free energy of the boundaries in Si-Au, Si-Cu, Ge-Au, GaAs-Au, InAs-Au, SiC-Fe, InP-Au, and so on systems.
Nature-inspired orbital angular momentum beam generator using aperiodic metasurface
Authors: Taher Al-Nuaimi Mustafa K , Hong Wei , Whittow William G
Published: April 2021

This article presents the design of reflective nature-inspired metasurfaces for generation of wideband and high purity circularly polarized (CP) orbital angular momentum (OAM) waves. It has been shown in this article that the breaking of the transitional periodicity and the combination of aperiodic nature-inspired distribution of sub-wavelength sized meta-atoms based on Pancharatnam–Berry (PB) phase theory can lead to OAM beams of high purity with improved bandwidth. The distribution of the PB anisotropic meta-atoms across the proposed metasurface aperture is non-uniform and distributed along logarithmic spirals similar to sunflower seeds, i.e. outwardly logarithmic spiral lattices of no transitional periodicity. The proposed reflective CP-OAM beam generator metasurface diameter is 140 mm, thickness ≈ 0.11λ
17GHz and has 600 anisotropic spatially rotated PB meta-atoms of sub-wavelength size of 5 mm ≈ 0.28λ
17GHz. Four OAM metasurface generators have been designed to produce OAM waves of various modes from 1 to 4. Both simulation and experimental results have demonstrated that the proposed metasurfaces can efficiently generate CP-OAM beams from 13.1 GHz to 20.5 GHz (BW = 44%) with high mode purity >90%.
Dual-active-layer InGaZnO high-voltage thin-film transistors
Authors: Huo Wenxing , Liang Huili , Lu Yicheng , Han Zuyin , Zhu Rui , Sui Yanxin , Wang Tao , Mei Zengxia
Published: April 2021

InGaZnO high-voltage thin-film transistors (HV-TFTs) with vertical dual-active-layer structure and lateral offset design were fabricated at low temperature. The TFT features such as sub-threshold swing, threshold voltage, and hysteresis voltage are similar to those of the normal devices; furthermore, they are independent of the offset length. The blocking voltage of HV-TFTs with an offset of 10 μm is 406 ± 17 V while the ON/OFF ratio reaches 109 at

V

DS

=
10

 V

.
Investigating well potential parameters on neural spike enhancement in a stochastic-resonance pre-emphasis algorithm
Authors: Güngör Cihan Berk , Mercier Patrick P , Töreyin Hakan
Published: April 2021

Objective. Background noise experienced during extracellular neural recording limits the number of spikes that can be reliably detected, which ultimately limits the performance of next-generation neuroscientific work. In this study, we aim to utilize stochastic resonance (SR), a technique that can help identify weak signals in noisy environments, to enhance spike detectability. Approach. Previously, an SR-based pre-emphasis algorithm was proposed, where a particle inside a 1D potential well is exerted by a force defined by the extracellular recording, and the output is obtained as the displacement of the particle. In this study, we investigate how the well shape and damping status impact the output signal-to-noise ratio (SNR). We compare the overdamped and underdamped solutions of shallow- and steep-wall monostable wells and bistable wells in terms of SNR improvement using two synthetic datasets. Then, we assess the spike detection performance when thresholding is applied on the output of the well shape-damping status configuration giving the best SNR enhancement. Main results. The SNR depends on the well-shape and damping-status type as well as the input noise level. The underdamped solution of the shallow-wall monostable well can yield to more than four orders of magnitude greater SNR improvement compared to other configurations for low noise intensities. Using this configuration also results in better spike detection sensitivity and positive predictivity than the state-of-the-art spike detection algorithms for a public synthetic dataset. For larger noise intensities, the overdamped solution of the steep-wall monostable well provides better spike enhancement than the others. Significance. The dependence of SNR improvement on the input signal noise level can be used to design a detector with multiple outputs, each more sensitive to a certain distance from the electrode. Such a detector can potentially enhance the performance of a successive spike sorting stage.
Effects of solution concentration on the structural and optical properties of CuAlO2 thin films prepared on 4H-SiC via sol-gel method
Authors: Hu Jichao , Liu Xianhe , He Xiaomin , Wang Xi , Yang Guowen
Published: April 2021

In this work, the effects of solution concentration on the crystal structure, optical properties and surface morphology of the CuAlO2 thin films prepared on 4H-SiC (0001) by sol-gel method were studied. X-ray diffraction (XRD) indicates that the CuAlO2 films are polycrystalline and have a high preferential growth orientation (012). In addition, four emission peaks were observed from room temperature photoluminescence (PL) spectra. The emission peaks at 360 nm (3.45 eV) and 380 nm (3.26eV) are near band edge emission of CuAlO2 film and 4H-SiC substrate, respectively. The other two emission peaks at 410 nm (3.02 eV) and 470 nm (2.64 eV) arises from Cu-vacancy defect. The surface roughness of the films was increased in the case of high solution concentrations, resulting a reduction in the optical transmittance. However, an overall improvement in crystallinity of the films and reduction of Cu-vacancy defect was observed with the increased solution concentrations.
Experimental study on freeze-thaw resistance of modified magnesium oxychloride cement foam concrete
Authors: Zhong Dongqing , Wang Shuguang , Gao Yu , Wang Luming , Feng Koubao
Published: April 2021

Magnesium oxychloride cement foam concrete specimenswere prepared by applying the inorganic-organic composite modification method to improve the water resistance of magnesium oxychloride cement and using the composite protein foaming agent for the purpose of foaming. Then, freeze-thaw cycle test was performed to examinethe frost resistance property of the specimens under the designed mix proportion. The experimental results show that: after 20 freeze-thaw cycles, neither macro-cracks nor hollow spalling are observed on the surface of the specimen, the strength loss rate is only 12%, and the compressive strength remains at a relatively high level of 1.46 MPa. Meanwhile, the microstructure of the specimen before and after the freeze-thaw experiment was analyzed through SEM test, and the failure mechanism during the freeze-thaw process was explained.
Acid-assisted synthesis of TiO2 nanoparticles for enhancement of visible light photocatalytic efficiency
Authors: Gu Yi-Jie , Zhou Ming , Dong Zhihua , Cheng Zhiqun , Deng Tian-Song
Published: April 2021

Compared with pure phase TiO2, the mixed-phase TiO2 nanoparticles with oxygen vacancies can help to reduce the carrier recombination rate and band gap, which is contribute to the visible light photocatalysis performance. In this study, three kinds of acid were separately used to prepare TiO2 nanoparticles by hydrothermal method without any post-heat treatment for enhancement of visible light photocatalytic efficiency. When utilized to assist photocatalysis degradation of methyl orange in water under visible light irradiation, the TiO2 nanoparticles obtained from HCl (H-TiO2) and CH3COOH (A-TiO2) showed stable photocatalysis performance for increasing the cycles up to ten times while only five cycles for TiO2 nanoparticles obtained by HNO3-assisted (N-TiO2). The photocatalysis performance of H-TiO2 powder and A-TiO2 powder are both better than that of the N-TiO2 powder. Therefore, the TiO2 samples prepared by HCl- and CH3COOH-assisted method in this work are regarded as excellent photocatalysts for water cleaning.
Study on interface of Sn-Ag-Zn lead free solder with low silver content
Authors: Xiao Jin , Zhou Yanqiong , Li Wuchu
Published: April 2021

The interface reaction between Sn-1Ag-1Zn low silver alloy solder and different substrates was studied. After aging at 200 ℃, a double-layer IMC structure is formed at the interface. Cu5Zn8 and Ag3Sn are formed from Cu substrate to solder in turn. The morphology of interface Cu5Zn8 has no change with aging. After aging for 100 h, the thickness of Ag3Sn is only about 4 μ m, and the IMC of bilayer structure blocks and suppresses each other. After Sn-1Ag-1Zn solder is welded to Cu substrate with Ni barrier layer, Ni3Sn4 layer is formed on the surface, and its thickness increases slowly with aging time at 200 ℃. After aging for 1000 h, the thickness of Ni3Sn4 layer is only about 1 μ m, and the morphology is smooth. There is no aggregation of other alloying elements near the interface and IMC which destroys the reliability of the interface is formed. The Ni barrier layer has a good barrier effect.
Research and Simulation of Three-phase Vienna Rectifier Based on Feedforward Decoupling Control
Authors: Liu Yanbin , Jia Qiang , Zhang Feng , Zhang Xiaohan , Zhang Junzhe
Published: April 2021

This paper takes the three-phase VIENNA rectifier as the research object. Aiming at the problem that its dq-coordinate system model has strong coupling and nonlinear characteristics, which makes the design of the controller system more difficult, a control strategy based on feedforward decoupling control is proposed. First, this paper analyzes the working principle and mathematical model of the rectifier, then introduce the newly proposed control system and controller parameter design, and finally build a simulation model with PESIC software. The simulation results verify the correctness and rationality of the proposed feedforward decoupling control. The proposed control strategy can further reduce the harmonic content of AC side of the rectifier, improve the steady-state performance, and have better dynamic performance when the load power changes.
Prediction Model of Microstructure and Properties of Al Foil Alloy During Thermal Deformation
Authors: Yan Wenduan , Li Yan , Xu Yanhua , Lai Wanqing , Zhou Xiumin
Published: April 2021

Prediction model of microstructure and properties of Al foil alloy was established by thermo-simulation compression experiment. The relationships between grain size, material constants, and flow stress were studied. In thermal deformed Al foil alloy, the relationship between grain size and material parameter Z met an approximately linear relationship, and an unitary linear regression equation was established. The influence of grain size on flow stress during thermal deformation was highly significant. The prediction models could thus predict the structure of the alloy during thermal deformation effectively, and guide the Al foil rolling.
The influence of copper content on the braking performance of iron-based powder metallurgy friction materials
Authors: Lan Hai , Hui Yang , Han Ming , Liu Guimin , Du Jianhua
Published: April 2021

Three iron-based powder metallurgy friction materials with different Cu content were prepared by powder metallurgy. The friction and wear properties of the materials were evaluated by the MM3000 friction and wear tester, and the effect of Cu content on the friction coefficient, wear rate and surface morphology was studied. The results show that with the increase of copper content, the matrix components are alloyed at high temperature, and the hardness and strength are significantly improved. The coefficient of dynamic friction and wear rate decreased significantly, and the coefficient of static friction and friction stability increased at high temperature. When the copper content is low, abrasive wear, spalling wear and fatigue wear are the main causes, while when the copper content is high, only slight abrasive wear occurs.
The Synthesis of WS2 Atomic Layers under Varying Source-Substrate Distance
Authors: Huang Youna , Zhang Guoxin , Yan Bing , Ning Bo , Zhao Hongquan
Published: April 2021

Although monolayer WS2 (Tungsten Disulfide) has attracted many interest, controllable synthesis of large-area WS2 triangles is still challenging. Here, we report salt-assisted CVD growth of WS2 atomic layers using a kind of sandwich structure in a semi-sealed installation and firstly investigate the effect of the width of the hollow (Dss) of the structure. We demonstrated WS2 triangles growth up to 300 μm coverage and showed the effect of hollow on the crystal size. By optimizing the width of the domain, large-area WS2 films were obtained. We utilized optical microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), Raman spectroscopy and photoluminescence (PL). Our study provides method to fabricate large area WS2 flakes and the experiment is critical to building scalable devices.
Research on properties of alkali activated lead-zinc mineral powder cementitious materials
Authors: Yuan Bicheng , Gong Weiting , Chen Sicheng , Li Peng
Published: April 2021

Cement has long been used as the main cementing material of the artesian paste filling material in the goaf of a mine, giving a generally high strength. However, the cement ‘two grinding and one burning’ process consumes a lot of energy, which aggravates the greenhouse effect. Therefore, a new type of cementitious material with lower energy consumption and lower emissions is needed. Solid wastes are useless by-products after mining and beneficiation, which are often dry piled in the open air, wasting land resources and polluting the environment. This project studied an alkali-activated mineral powder cementitious material, delineated its internal structure and morphology, and tested its mechanical properties. In a gelling system with 70% mineral powder, 30% Portland cement, 1% sodium silicate and a water-cement ratio of 0.4, the hydration reaction commenced the earliest and the early strength of the test block was the highest. In addition, further increasement in proportion of mineral powder or sodium silicate could not have a positive effect on the early strength of the system.
The Melt Heat Treatment and the Structural Changes in ZhS6U and Inconel 718
Authors: Tarasov Dmitry , Tyagunov Andrey , Milder Oleg
Published: April 2021

One of the most curious phenomena observed in metal melts is the temperature-induced liquid-liquid structural changes. As a result of the thermal treatment lead to LLT, a more equilibrium and micro-uniform melt consisting of atomic associations is formed. In nickel alloy melts, the changes that have occurred are irreversible and have a significant effect on the formation of the final structure and the mechanical properties of the metal in the solid state after its crystallization. In addition, they are the starting point for the scientific substantiation of new technological modes of smelting and heat treatment of alloys, which further improve their operational properties, as well as reduce metallurgical defects and production waste, and rational use of expensive ligands. All this in general will lead to a significant increase in the performance of melts and metal products. Our work is devoted to the experimental confirmation of the LLT transition in two common nickel-based alloys by a non-invasive electromagnetic method.
Recent progress in developing fluorescent probes for imaging cell metabolites
Authors: Hong Shanni , Pawel Gregory T , Pei Renjun , Lu Yi
Published: April 2021

Cellular metabolites play a crucial role in promoting and regulating cellular activities, but it has been difficult to monitor these cellular metabolites in living cells and in real time. Over the past decades, iterative development and improvements of fluorescent probes have been made, resulting in the effective monitoring of metabolites. In this review, we highlight recent progress in the use of fluorescent probes for tracking some key metabolites, such as adenosine triphosphate, cyclic adenosine monophosphate, cyclic guanosine 5'-monophosphate, Nicotinamide adenine dinucleotide (NADH), reactive oxygen species, sugar, carbon monoxide, and nitric oxide for both whole cell and subcellular imaging.
Matrix Kesten recursion, inverse-Wishart ensemble and fermions in a Morse potential
Authors: Gautié Tristan , Bouchaud Jean-Philippe , Le Doussal Pierre
Published: April 2021

The random variable 1 + z
1 + z
1
z
2 + … appears in many contexts and was shown by Kesten to exhibit a heavy tail distribution. We consider natural extensions of this variable and its associated recursion to N × N matrices either real symmetric β = 1 or complex Hermitian β = 2. In the continuum limit of this recursion, we show that the matrix distribution converges to the inverse-Wishart ensemble of random matrices. The full dynamics is solved using a mapping to N fermions in a Morse potential, which are non-interacting for β = 2. At finite N the distribution of eigenvalues exhibits heavy tails, generalizing Kesten’s results in the scalar case. The density of fermions in this potential is studied for large N, and the power-law tail of the eigenvalue distribution is related to the properties of the so-called determinantal Bessel process which describes the hard edge universality of random matrices. For the discrete matrix recursion, using free probability in the large N limit, we obtain a self-consistent equation for the stationary distribution. The relation of our results to recent works of Rider and Valkó, Grabsch and Texier, as well as Ossipov, is discussed.
Thermal Comfort in East Campus Center of ITB Bandung
Authors: Ramadhan Dean , Adifa Aulia Mufti , Ramadhan Try
Published: April 2021

The campus center is the building regarded as the center of student activities. It’s the typical building commonly found on campuses. The building is specifically intended for the students to entertain and socialize themselves. The building can also function as the center for small-scale conference conferences; the meeting is leased to student communities and local organizations. By various activities taking place in the building, it’s demanded to meet the need for the users’ thermal comfort to realize all of their programs following their objectives respectively. The study on ITB Campus Center Building aims to encourage students to be familiar with the influence of the building orientation, dimensions, shape, material, configuration, and the opening type that affect the space’s air circulation. This research used a quantitative descriptive method approach by measuring the temperature and humidity through the gauge for temperature and humidity and an anemometer for wind speed. It identifies the study object’s thermal comfort based on the PMV Index in the CBE Thermal Comfort Tools. And from the results of our research, it can be concluded that the building has fulfilled most aspects of thermal comfort.
Design of Sustainability of Solar Panel Integration in A Green Building Complex of Wonogiri Regent Office
Authors: Nur ‘Aini Etika , Setiawan Bakti , Budiarto Rachmawan
Published: April 2021

With the opportunity to repair and rebuild office buildings in the Wonogiri Office Area, where previously area offices still scattered in various regions, now they will be moved and arranged in 1 location with the concept of City Forest—thus opening up opportunities for more environmentally friendly energy use (Renewable Energy). The implementation of Solar Panel rooftop for office buildings in the planning does not only consider the amount of electricity obtained from the photovoltaic installed for offices. However, it also considers the Sustainable Benefits factor to be more reliable and maintain its sustainability. Sustainable benefits in the Wonogiri Office can see from various factors such as; Social, Organizational, Technical, Economic, Environmental. The sustainability factor is assessed after considering the economic feasibility aspects (NPV, IRR, BCR, PBP, LCOE, NPC) and according to the Solar Power Plant installation’s technical aspects. This paper suggested help solves problems related to renewable energy projects that did not last long. It can also become a pilot project for other agencies in terms of a more sustainable Photovoltaic design. This paper will reveal emission reduction, components that need attention, and the willingness and ability to prepare for renewable energy.
Optimization of Thermal Comfort in Rifain Digital Printing: Vertical Garden with Water Wall System Concept
Authors: Hardianto Sarining Sekar Ayu Andhari , Nabila Khadijah Ahlam , Paramita Beta
Published: April 2021

Thermal comfort is a major factor for a building’s design, and is associated to room temperature conditions. Thermal comfort depends on climatic variables and several individual / subjective factors such as clothing, acclimatization, age, gender, level of health, and others. Measurements of thermal comfort made via Meteoblue and SunHour software at the Rifain Digital Printing location provide data including temperature, humidity, sun exposure and wind speed. The data is then synthesized using CBE Thermal Comfort, a software that detects conformity to thermal comfort standards in a room. The results of measurement and data synthesis indicated that the building requires a cooling temperature of 5.2 ° C. From these results, it can be said that the thermal comfort of Rifain Digital Printing is not optimal. Improvements are needed to the existing thermal conditions. One of the efforts to optimize thermal comfort is the use of vegetation and water (Talarosha, 2005). Based on synthesis result obtained through research and data processing through literature studies, we came up with a solution, namely a vertical garden with a water wall system design as an effort to overcome the problem of thermal comfort in the Rifain Digital Printing building.
Operational Energy Analysis of an Educational Building Design; A Case Study of Center of Excellent (CoE) Building at Universitas Pendidikan Indonesia (UPI)
Authors: Jurizat A , Surahman U , Tedjawinata G K
Published: April 2021

Operational energy contributes significantly to the most energy consumption of a building’s life cycle. Analysis of operational energy is usually conducted when a building is being operated. However, we can compare and predict the operational energy of a building’s designs to obtain the best design alternative low energy building. The objective of this study is to simulate the operational energy of the design of the Centre of Excellent (CoE) building at Universitas Pendidikan Indonesia (UPI). Rhinoceros and Grasshopper with Ladybug and Honeybee are selected as the software simulation due to the comprehensive features of energy simulation. This modern building will be constructed for five floors with an area of about 5000 m2 per level facing south and north sides. Analysis of operational energy calculated three main factors of cooling, lighting, and other equipment. The result shows that the annual operational energy contributes to about 586 kWh/m2 per year. This value is far from the basic standard for educational building, with about 240 kWh/m2 per year from ASEAN. The cooling system of the building is recorded as the highest amount of energy use. Further, evaluating the building’s operational devices and the strategy to reduce the energy loads will be proposed to accommodate a modern school building’s main issue that harms operating energy.
Student Boarding House Quality in term of Health Design (Case study: Boarding House near University of Bengkulu)
Authors: D Oktavallyan S , Seftyarizki D , Wardhani F
Published: April 2021

Health is an important requirement in designing a residential building. One of them is a boarding house. Most of the nomad students who came from another city spend their time mostly in their room of boarding house (id: kost). It makes the health quality of boarding house needs to be considered. This study will examine the conditions of boarding houses around the University of Bengkulu in terms of health aspects from the building design. The health quality of a building will be assessed from the location and environment of a boarding house, as well as the design of lighting and ventilation. This study uses a mixed method of quantitative and qualitative. The primary data collection was carried out by online questionnaire survey to UNIB students who live by renting boarding rooms around the campus. The result is boarding houses around the University of Bengkulu are in good condition. But some problems of natural light are found in the glare, and in some cases, rooms do not get natural lighting. Ventilation is the biggest problem for students’ showed by the opening position that only on one side, no opening in the bathroom, which does not meet the rules. The environment students’ boarding houses around the University of Bengkulu, indicated by clean environmental conditions, good water quality, and not noisy. But, some boarding houses are still lacking in greeneries. Results of this study are expected to contribute to improving the environmental health quality around the University of Bengkulu by the buildings and other built environment design.
Optimization the Use of Artificial Lighting at Architectural Design Studios in Architecture Study Program of Universitas Syiah Kuala
Authors: Edytia M H A , Meutia E , Sahputra Z , Billah M A , Shafwa P
Published: April 2021

Drawing, writing, cutting and composing materials, and displaying pin up are some activities carried out during architectural design course in an architectural design studio. These design activities require good lighting to see details. However, based on the results of the evaluation conducted by Jamil (2018), consisting of questionnaires and measurements of natural lighting in studio A, studio B, studio C, and studio D, four studios in Architecture Study Program of Universitas Syiah Kuala (Unsyiah), Banda Aceh, Indonesia, proved that artificial lighting is needed to support these design activities. This study aims to evaluate the use of existing artificial lighting by measuring it using lux meter. The data obtained were simulated through Dialux Evo 9.0, lighting evaluation software. Finally, the simulation data presented as three-dimensional modelling. This study provided design recommendation about artificial lighting for architecture students to carry out design studio activities such as tutorial, workshops, mentoring, reviews, and exhibitions effectively and efficiently.
Identification of Acoustic Comfort in Classroom of Gedung Kuliah Bersama V of Bengkulu University
Authors: Aldona N. , Seftyarizki D. , Prihatiningrum A. , Ramawangsa P. A. , Khairunnisa E. , Refti S. M. , Kharisma M W
Published: April 2021

Classroom is a place for a group of people to study and improve their knowledge. To make learning activities becomes more effective, a classroom is expected to have comfort in terms of thermal, lighting, ventilation, and acoustic. This study focused only on the acoustic comfort of the classrooms at Gedung Kuliah Bersama V (GB V), University of Bengkulu (UNIB). Acoustic condition in the classroom has a crucial role for student concentration that affect to student’s achievement. Reverberation time (RT), initial time delay gap (ITDG), and the possibility of echo phenomenon in the classroom will be identified in this study as the acoustic parameters. Ecotect v5.5 software is being used to simulate three types of a classroom that represent classroom types at GB V. This simulation is used to identify RT, ITDG, and echo occurs in the classroom. Results of this study showed that ITDG values of these three classrooms had met the standard the classroom that used for conversation, which is under 20 m/s. Echo phenomenon is also relatively not seen in the simulation. It means that these three classrooms were also comfortable enough in terms of acoustic. However, the RT values in the three rooms still have not reached the optimum condition, 1.40 m/s for RK 2.02, which is higher than standard and lower than standard for the first room and 0.23 m/s and 0.10 m/s for the second and third room. So thus, some design recommendations are needed to get an optimum RT value.
Spatial Poverty of Poverty Alleviation in Bantul Districts of Yogyakarta
Authors: Listyaningsih U , Satiti S , Kurniawidi A S
Published: April 2021

Poverty is one of the five dimensions of the poverty trap suggested by Robert Chambers. Those poverty dimensions are vulnerability, physical weakness, powerless, and region isolation. The region isolation associates with accessibility. Meanwhile, access is a medium to open up to social and economic opportunities. This research seeks to see the poverty base on topography condition as a tool to figure out the accessibility. Also, this research aims to examine the poverty level, which ultimately will be used to determine the poverty alleviation programs. Poverty is determined based on the beneficiaries of rice to the poor (beras miskin). The number of poor families in the two research locations was 207. Besides the structural interview using the questionnaire, this research also used a qualitative method with an in-depth interview. The aim of the research on the level of poverty and determine the poverty alleviation programs will be analyzed descriptively using a cross-tabulation. Meanwhile, the influencing factor on poverty will be analyzed using a co-efficient regression. The demographic, social, and economic characteristics of the heads of poor families at the two research locations showed that there was no differentiation.
Fulfillment of Facilities for Persons with Disabilities in Taman Bungkul Surabaya
Authors: Noviyanti U D E , Rinekso E Y , Hadi I
Published: April 2021

Traveling is a right for everyone even though they have special needs, such as people with disabilities. However, until now there are still many facilities that are less accessible for persons with disabilities. Taman Bungkul as an alternative tourist spot in Surabaya must also provide friendly facilities for persons with disabilities. This paper aims to understand the tourism needs of persons with disabilities, to find out the availability of facilities and the efforts made by Taman Bungkul managers in providing facilities for visitors with disabilities. This research uses a qualitative approach. Qualitative data obtained from interviews, observations, and literature studies will be analyzed descriptively qualitatively. So that the research results can be input for stakeholders and tourism destination managers to increase the provision of friendly facilities for people with disabilities. The results showed that persons with disabilities have different definitions related to tourism activities. Taman Bungkul has provided several facilities for persons with disabilities, but it is not fully disability friendly because the conditions of the facilities are not up to standard and are still difficult for persons with disabilities to access. The management of Taman Bungkul continues to make efforts to complete facilities for persons with disabilities but is constrained by several obstacles, namely limited development funds and the absence of a Surabaya City government program that focuses on establishing tourist destinations for people with disabilities.
The digital management system of the tangible culture heritage for enhancing historic building governance in Malang, Indonesia
Authors: Santosa H. , Yudono A. , Adhitama M. S.
Published: April 2021

The development of a digital management system to support historical building assets’ management process based on public participation is the latest innovation in preservation, conservation, and restoration activities of historical buildings. In line with the importance of applying Good Governance principles in the 4.0 Industrial Revolution in Malang city government, it is essential to develop a Governance Digitalization system to support sustainable tourism in heritage tourism management. This study aims to establish a digital management framework system for Tangible Culture Heritage based on HBIM to manage historical building assets in Malang. This system focus on the cultural heritage assets of Malang City that represents the three developments in the Dutch Indies architectural style. The BIM capability implemented in historical buildings in Heritage Building Information Modeling (HBIM) terminology can bring complexity and depth of information to historical buildings towards a sustainable lifecycle heritage management framework. This research implements the 3D modeling automatic reconstruction method (3D Laser scanner) processed with Building Information Modeling (BIM) based software. The process consisted of 3 (three) stages: identifying and mapping Historical Landmark Buildings, developing 3D content models, and generating HBIM data viewer application. This study’s results reveal that using 3D laser scanning technology can accelerate the recording process and object modeling of the HBIM library, offering high accuracy and efficiency in recording complex structures and architectural elements. The final result of HBIM modeling is translated into interactively present the 3D model and 2D documentation of Historic Building Information Models through the HBIM mobile data viewer.
Spatial Zoning Analysis of Zoo in Urban Area as a Preliminary Assessment for Improving the Education and Recreation Roles
Authors: Dera R , Ridzqo I F
Published: April 2021

Zoos have an important role as an animal conservatory. An ex-situ animals conservation should have a living space that resembles its natural habitat while also functioning as an exhibition space for educational purposes. While in nature, animals require a large landscape as their habitat. Unfortunately, most zoos’ limited land areas impede them from doing so, especially for zoos in a dense urban area. As a form of public space in the city, zoos not only serve as an educational means for the urban community but also a recreational facility to withdraw from the urban life that is far from the natural environment. Several Indonesian zoos that occupied the minimum land areas in an urban context are Bandung Zoo, Surabaya Zoo, and Batu Secret Zoo. Unfortunately, the two first received relatively bad visitor reviews regarding the lack of animal exhibition space, entertainment space, and supporting space. Meanwhile, the more recently built Batu Secret Zoo, which shares a similar land area, continuously receives good visitor reviews because they feel it simultaneously meets their educational and recreational needs. Improvement is sorely needed for the other zoos. This paper analyzed the spatial zoning of the three zoos’ landscapes and associated them with the visitor experience. It is a preliminary step in assessing the zoo for further improvement in educational and recreational roles. The result shows that the animal exhibition zoning based on a specific design base plays a significant role in improving the educational and recreational function.
Developing a virtual urban oasis design to reduce urban stress in warm-humid climate
Authors: Pansela Daniel , Sekarlangit Nimas , Satwiko Prasasto , Felasari Sushardjanti
Published: April 2021

Dense cities around the world, including those in the warm-humid climate, develop very fast by urbanization. Natural sceneries are commonly limited in those cities, which some experts said links to urban stress syndrome. The urban oasis, a relatively small pocket park located in urban gaps or between buildings easily accessible to the surrounding community, is needed to reduce the urban stress. However, designing an urban oasis and building it for granted does not guarantee its therapeutic effect. Meanwhile, current advanced virtual reality technology offers the ability to explore the therapeutic impact of urban oasis design before it is built. This research reports the development of a virtual urban oasis based on its effect on human stress. The experiment adopted a virtual reality method with Unreal Engine 4 software to construct a virtual urban oasis based on preceding theoretical reviews on reducing urban stress. Three respondents wore Head Mounted Display (Oculus Rift S) submerged in the virtual urban oasis while POLAR H10 recorded their heart rate (HR) and heart rate variability (HRV). The experiment found that the virtual urban oasis decreased the HR and increased the HRV by consecutively, 11% and 8%. Thus, the virtual urban oasis helped reducing stress. Keyword : Unreal engine, urban stress, heart rate variability
Application of Genetic Algorithm in optimizing redesign of street lighting
Authors: Shintabella R , Abdullah A G , Hakim D L
Published: April 2021

Street lighting system is designed to give comfort to users by considering the energy saving aspect, lighting quality and suitability with the lighting standard. This research aims to describe the results of optimizing the redesign of street-lighting using the artificial intelligence method, Genetic Algorithm. This algorithm is applied based on the relationship between energy use and public street lighting parameters such as the average illumination, wide roads, high pole, and various other parameters that correspond to the lighting standards in Indonesia. The redesign process is using MATLAB for Genetic Algorithm simulation and DIALux for implement of design results. The results of this study indicate that this method is very good and recommended to the designer in determining the design parameters.
Prototype of portable measurement instrument for turnout motor power in railway system
Authors: Budiman F , Sugiana A , Ramdhani M , Nasution H A K , Farhan R , Sebayang A E
Published: April 2021

A prototype of rail turnout motor measurement device was designed based on motor torque inspection, using a load cell sensor. A rail turnout is a branched railroad construction to control the railroad track that controlled by turnout motor, therefore it is one of important railways elements for guiding and directing the train to not derailment or collide with another train. The device was made in order to check the reliability of turnout machine in railway systems. In Indonesia, currently the inspection of turnout machine was done manually and still not so efficient in term of the process. Here, we built a portable system device consisted of load sensor, processed with a microcontroller and the data were recorded and displayed in a Liquid Crystal Display (LCD). The device was tested directly to a turnout machine on the railroad at Kiara Condong Station, Bandung, Indonesia. The measured results showed that the device working properly and the average pulling strength of turnout machine at the station was 256.6 ± 2.88 kg.
‘Bina Wicara’ application and communication engineering of parents toward autism children
Authors: Yusria Y , Ridwan R , Hariyanto D , Ariska M
Published: April 2021

The’Bina Wicara’ application is a game that is used to practice the ability of children to communicate with other people around them that can be used for speech therapy. Communication engineering is a learning process that involves the participation of parents in helping children to talk. The purpose of this study is to help an application toward autism children who experience difficulties and disturbances in speaking through game play and parental communication engineering in engaging and actively participating. This study uses a qualitative and technological mixed approach to communication media technology in autistic children service institutions in Jambi province. The subjects in this study were some 8 years old. students The final results of this study explain that: first. play games are able to encourage children to identify objects and pronounce them correctly. Through the use of speech development applications such as this game in children with autism can help children to mimic movements / motor mouth, vocal imitation, label and identify and follow simple commands. The second finding from the results of this study shows that through the involvement and active participation of parents in the learning process can help children organize their language development. The other side of the findings of this study explains that the interaction of the environment around children, especially children with special needs can help develop their speaking skills.
The swelling effect of sodium-bentonite as an additive in water-based drilling sludge with different concentration of polyamine inhibition
Authors: Akbar T , Setiati R , Akbar R
Published: April 2021

A highly reactive sludge on drilling progress has become a common problem. The problem will cause swelling clay or high filtration loss. With a risk of swelling appearance and too much filtration loss that may cause, sodium-bentonite is widely used in drilling sludge to give more viscosity and optimal ability to hold and lift the cutting inside the borehole. It contains mostly montmorillonite like particles of sodium that overpower the iolite content inside it. Polyamine as an inhibitor to the clay can infiltrate into the bentonite c-spacing, which is a gap between two layers of bentonite structure. A test has been conducted to measure the effect of polyamine inhibition inside a water-base sludge formulation x that is previously inhibited with sodium-bentonite. These tests were conducted using a number of instruments such as API Filtrate loss, swell meter test, retort oven, and Vann vg meter with API Standard procedure. The result provides a distinctive conclusion about how the rheological elements react toward the polyamine existence with different concentrations (4gr-10,5gr) inside the sludge. This research also reveals that the sludge durability is different between room temperature and high temperature (300°F).