bluuebunny/crossref_metadata_2025 huggingface dataset:
Eimeria piriformis live-attenuated vaccine is successfully lower clinical coccidiosis of rabbits raised in tropic
Authors: Hamid P H , Prastowo S , Nugroho W S , Widayanti R
Published: November 2021

Livestock can sustain expected levels of productivity if the disease is controlled successfully. Rabbit coccidiosis is the major disease-causing high mortality and morbidity. Since no vaccine is available, the eradication is primarily based on careful management combined with medication in feed or water. Chemical coccidiostat is not only raising antibiotic resistance. It also adds environmental contamination since antibiotic is secreted onto land and water. In this report, we attenuate Eimeria piriformis and used it as the vaccine candidate for New Zealand rabbits in Yogyakarta, Indonesia. 90% of rabbits immunized with live attenuated E. piriformis showed no severe signs when challenged with wild type containing 5 x 105 oocyst. The use of live-attenuated E. piriformis is promising as coccidiosis prevention and control program. The strategy would reduce the continuous usage of chemoprophylactic substances in rabbit husbandry and therefore contribute in reducing environmental contamination of antibiotics
Comparison of Aceh cow’s performance on different mating systems at BPTU HPT Indrapuri, Aceh Province, Indonesia
Authors: Baliarti E , Wardani A S , Prabowo B W , Meutia N , Yusmadi  , Marwan  , Bintara S , Widi T S M , Ngadiyono N
Published: November 2021

This research aimed to compare Aceh cow’s performance on different mating systems at BPTU HPT Indrapuri, Indonesia. This research uses 202 Aceh cows with varying systems of mating; natural mating (164 cows), and artificial insemination (AI; 38 cows). Cow’s performance data included birth weight, postpartum mating, calving interval, weaning weight, Cow Reproduction Index (CRI), and Cow Production Index (CPI), obtained from the recording in 2014-2019 and calculation. This research uses the Oneway Anova test to analyze the cow’s performance between mating systems. The results of the cow’s performance included birth weight, postpartum mating, calving interval, weaning weight, CRI, and CPI for natural mating system were 14.32±1.41 kg, 265.61±260.0 days, 558,.21±260.07 days, 54.32±19.32 kg, 0.69 calf/cow/year and 37,48 kg/cow/year respectively, while for AI system were 14,98±1,38 kg, 289.34±285,.06 days, 581.94±285.06 days, 59.10±21.83 kg, 0.70 calf/cow/year dan 41.37 kg/kg/cow/year. The results showed that the performance of the Aceh cows with natural mating dan artificial insemination was relatively the same.
Dressing percentage, giblet and abdominal fat of broiler chickens given Orthosiphon stamineus Benth leave juice in drinking water
Authors: Londok J J M R , Rompis J E G
Published: November 2021

This research was conducted to study the effects of cat whiskers leave juice (Orthosiphon stamineus Benth) (OLJ) on the dressing percentage, giblet, and abdominal fat of broiler chicken. The research used 100 chicks which were reared for five weeks. At the end of the fifth week, 40 chickens were slaughtered as samples. The diets consisted of a commercial ration with 2900 kcal.kg−1 metabolizable energy and 22% protein. The drinking water consisted of different levels of OLJ (0, 10, 20, 30 mL/L). A Completely Randomized Design was used in this research with 4 treatments and 5 replications. Dressing percentage, liver, heart, gizzard, and abdominal fat were observed. The data were analysed by Analysis of variance/ANOVA. The result showed that OLJ significantly (P<0.01) affected live bird’s weight, but not significantly different (P>0.05) for dressing percentage, giblet, and abdominal fat of broiler chicken. On broiler chicken, administration of 10 mL/L OLJ significantly (P<0.01) decreased the live bird’s weight compared to control (0 mL/L OLJ). However, drinking 20 mL/L and 30mL/L cat whiskers juice were not significantly different. The conclusion is that the broiler chicken could tolerate up to 30 mL/L cat whiskers leaves juice.
Application of VECM on livestock production index, carbon dioxide damage, arable land, population growth, and GDP growth in Indonesia
Authors: Permadani F E , Prasetyani D , Firdaus A A
Published: November 2021

Environmental effects due to carbon dioxide in Indonesia tend to increase and arable lands are shrinking. These things are accompanied by population and economic growth, making the need for food higher so that the livestock production index increases. After the economic crisis caused by the subprime mortgage, the livestock production index gradually recovered and increased consistently in 2009-2018. However, it turns out that the contribution of the livestock sector to the economy in 2011-2013 was still below the agricultural and plantation sectors. The purpose of this research was to analyze the cointegration and causality relationship of livestock production index, carbon dioxide damage, arable land, population growth, and GDP growth using the VECM method for time series data from 1970-2018. The results show that there was cointegration between variables. The causality test shows that population growth and carbon dioxide damage affect each other. Meanwhile, the livestock production index on population growth has a one-way causality pattern. Arable land on carbon dioxide damage also has a oneway causality pattern. In general, the VECM model shows that there is a long-term relationship between the variables that were used in this research.
Integration of livestock supply chain strategy as part of the creative economy and creative industry in Indonesia: literature review
Authors: Prasetyani D , Ardianto D T , Firdaus A A
Published: November 2021

Low production capacity and the traditional farming method that is practiced in Indonesia have resulted in Indonesia dependent on imports to fulfil the demand. Meat, milk, eggs, even skins still can not be fully supplied from national production. Livestock supply chain strategies such as the application of the creative economy and creative industries are needed to overcome the dependency gap on imported raw materials. The challenge in Indonesia is lack of technology & knowledge. This study aimed to determine the role of the creative economy and the creative industry in improving the livestock supply chain in Indonesia. This study used a conceptual method from a literature study. Currently, the creative economy and creative industries are still relatively at the level of SMEs. The recurring problem shows the weak management of technology and knowledge. Based on the literature study result, the creative economy and creative industries can increase the supply of livestock in Indonesia. Hopefully the research on creative economy strategies and creative industries will not only become a trend but also sustainable in the future.
Performances of Bali cow kept by the palm oil farmers in Rokan Hulu, Riau
Authors: Baliarti E , Setiawan I , Widi T S M , Suhartanto B , Maulana H , Atmoko B A , Astrini A L
Published: November 2021

The development of the beef cattle population in Indonesia can be done by increasing the cows’ performance keeping by oil palm farmers. The research aimed to study Bali cows’ production system and performance maintained by oil palm farmers in Karya Mulya Village, Rambah Samo District, Rokan Hulu Regency, Riau. Fifteen farmers as respondent with 33 of their Bali cows were the subjects of observation. This research was conducted using the interview method, focused on the production system, body size, and reproductive performance. Data were analyzed descriptively, quantitative, and qualitative. The study results on body size showed that the Bali cows had a chest circumference of 156.68±7.07 cm, shoulder height 112.73±8.86 cm, absolute body length 113.77±5.26 cm, relative body length 105±6.89 cm, body weight 253.65±28.64 kg, and body condition score 2.91±0.50. Reproductive performance includes the calving interval is 376.96±77.65 days, weaning time is 7.74±1.16 months, postpartum estrus 72.00±36.81 days, postpartum mating 72.00±36.81 days, service per conception 1.23±0.8, calf mortality 6.25%, calf weaning weight at 205 days is 97.59±22.88 kg, cows reproductive index 0.96 ± 0.26 and productivity 68.23 ± 46.89. It concluded that Bali cows raised by oil palm farmers in Rokan Hulu, Riau had good performance and body size.
Growth performances and digestability in Pekin ducks fed on a diet containing fermented agro-industrial by-products
Authors: Pangeran M R , Indarsih B , Wiryawan K G
Published: November 2021

Poultry industries in Indonesia develop rapidly in line with the increasing demand for poultry meat and eggs. However, fluctuations in availability and the high price of commercial feed bring about a serious problem for traditional farmers. The objective of this study was to evaluate the effect of feeding a diet containing a fermented mixture of water hyacinth leaves (Eichornia crassipes), rice bran, and blood (WRPS) on the production performance and nutrient digestibility of Pekin ducks. This research was conducted for 6 weeks using 100 Pekin ducks (unsex) aged 2 weeks. This study was conducted using a completely randomized design consisting of 4 treatments and 5 replications. The dietary treatments were T0 (control), T1 (30% WRPS), T2 (40% WRPS), and T3 (50% WRPS). At the end of the feeding trial, one duck from each replicate was put in a metabolic cage for digestibility study, adopting the total collection method. Incorporating WRPS in the diet brought significant differences (p<0.05) in feed intake, body weight gain, feed conversion, and digestibility. It can be concluded that the fermented mixture of water hyacinth leaves, rice bran, and protein of slaughtered waste as much as 30% can be used in the diet of Pekin ducks.
Digital marketing as a strategy for fulfilling Eid Al-Adha beef cattle: A case study of start-up companies
Authors: Pramana H P , Hastjarjo S , Sudarmo
Published: November 2021

The demand for beef cattle increases every year ahead of the Eid al-Adha celebration. While the fulfillment of orders in the market is rising, the critical point is that the distribution of beef cattle tends to be uneven between regions. This paper proposes a case study of how the interaction between market and demand fulfillment, in the case of the beef cattle market, can be supported by digital marketing. The focus is how the new company (start-up) creates a marketing chain between regions, West Nusa Tenggara and DKI Jakarta. An in-depth characterization of the marketing chain was carried out through semi-structured interviews. In addition, secondary data uses institutional/private publication data, which is then analyzed descriptively. Using integrated marketing communications (IMC) practices, we explore an enhanced framework for managing communications in the digital world. This research is expected to help fulfill the needs of livestock (beef cattle) to be more optimal, concise, attractive, and evenly distributed so that the social objectives of the celebration of Eid al-Adha are achieved. The study also highlights the utility for organizations to use social media strategically rather than simply as a tactical tool.
Betaine supplementation to adequate nutrient diet does not affect the growth performance of quails divergently selected based on bodyweight
Authors: Ratriyanto A , Styanti N , Widyas N , Prastowo S
Published: November 2021

This study aimed to determine the effect of body weight clustering and betaine supplementation to adequate nutrient diet on the growth performance of quails. Nine hundred seven-day-old quails (Coturnix coturnix japonica) were allotted to a 3×2 factorial completely randomized design. Three bodyweight clusters included Random (21.1±1.2 g), Low (17.9±0.4 g), and High (22.4±0.4 g). Each bodyweight cluster was fed a diet without (0%) and with betaine supplementation (0.14%), resulting in six combination treatments. Each treatment consisted of five replicates of 30 quails. The basal diet was formulated with sufficient protein (22%) and metabolizable energy (2800 kcal/kg). The observed variables included feed intake, body weight, feed conversion, and protein and energy efficiency ratio. The results revealed that there was no interaction between body weight and betaine supplementation on all variables. The High body weight group consumed more feed and produced a higher body weight on 42 days of age than other treatments (p<0.05). However, betaine supplementation did not affect all growth trait variables. In conclusion, betaine supplementation to nutrient adequate diet is not effective in improving growth performance of quails divergently selected based on body weight.
A comparative study of several bio-inspired algorithms in cost optimization of cellular beams
Authors: Tjahjono A , Wijayanti E J , Prayogo D , Wong F T
Published: November 2021

Castellated beams are commonly used in steel construction. This study will focus on castellated beams with circular-shaped openings, which are known as cellular beams. Cost optimization of cellular beams is needed to maintain cost efficiency. The optimization considers the selection of a root beam, the diameter of holes, and the total number of holes in the beam as the variables. Four metaheuristic algorithms are used to optimize the design, namely, the particle swarm optimization (PSO), differential evolution (DE), symbiotic organisms search (SOS), and artificial bee colony (ABC). A four-meter span beam with a 50 kN point live load in the middle of the beam and a 5 kN/m uniformly-distributed dead load are taken as the case study. The results indicate that the SOS algorithm yields the best optimization results in terms of the average, consistency, and convergence behavior with a 30 out of 30 success rates.
The study of shear wall uses in buildings during the architecture design process
Authors: Teddy Livian , Hidayat Husnul , Andriyali A Dessa
Published: November 2021

In Indonesia, an earthquake-prone area, building designs must be earthquake resistant, and using shear walls is one of the ways to make buildings more earthquake resistant. However, determining the requirements and optimal position of shear walls is difficult. Miscalculating in their positioning can cause torsion and other unpredictable behavior. Previous studies were done to know shear walls’ optimal areas and positioning. The first way was trial and error, but this method was ineffective and took a long time. The second way, MATLAB programming, is actually very effective since the needs and orientation of the walls can be determined precisely. Nevertheless, not all structural engineers and architects master the programming language. This study, therefore, proposes relatively simple formulas and procedures to determine the optimal area and positioning of shear walls for architects preliminary design during architecture design process. The accuracy test for the formulas and procedures was carried out using ETABS simulation experiments on 10 building models with various irregular categories. The result showed the formulas and procedures proposed in this study were quite accurate in calculating the needs and position of shear walls. Optimal conditions, furthermore, were quite easy to achieve in symmetrical geometric compositions (1 or 2 axes) while organic or random geometric compositions were quite difficult to achieve. When the use of shear walls achieves optimal condition, the strength and stiffness of a building are increased, and the distribution of its strength and stiffness is relatively even, hence anticipating deformation behavior and reducing building eccentricity.
Modified Partial Capacity Design (M-PCD): achieving partial sidesway mechanism by using two steps design approach
Authors: Tanaya L S , Herryanto H , Pudjisuryadi P
Published: November 2021

Partial Capacity Design (PCD) has been developed by using magnification factor to keep some columns undamaged during major earthquake. By doing so, the structures will experience the partial side sway mechanism which is also stable, instead of the beam sidesway mechanism. However, in some cases, structures designed by PCD method failed to show the partial side sway mechanism since unexpected damages were still occurred at some columns. In this research, modification of PCD method is proposed by using two structural models in the design process. The first model is used to design beams and columns which are allowed to experience plastic damages, while the second model is used to design columns which are intended to remain elastic when the structure is subjected to a target earthquake. Two nominal earthquakes corresponding to Elastic Design Response Spectrum (EDRS) level with seismic modification factors (R) of 8.0 and 1.6 are used in the first and second structural models, respectively. It should be noted that the second model is identical to the first model except that the stiffnesses are reduced for elements to simulate potential plastic damages. This proposed method is applied to symmetrical 6 and 10 storey buildings with seismic load according SNI 1726:2012 and with soil classification of SE in Surabaya city. A Non-linear Static Procedure (NSP) or pushover analysis and Non-linear Dynamic Procedure (NDP) or time history analysis are employed to evaluate the performance of the structure. The evaluation is conducted at three earthquake levels which are nominal earthquake that is used in second model, earthquake corresponding to EDRS level, and maximum considered earthquake (MCER) specified by the code (50% higher than EDRS level). The building performances satisfy the drift criteria in accordance with FEMA 273. However, the partial side sway mechanism was not achieved at NDP analysis at maximum seismic load, MCER.
Comparison reinforcement design shear wall modelling planar and assembly in elevator shaft
Authors: Wiyono Daud Rahmat , Milyardi Roi , Pranata Yosafat Aji , Kristianto Anang
Published: November 2021

Shear walls modelling as planar or assembly have different assumption in behaviour that will give different responses in forces. Shear wall planar modelling as individual walls which each wall was modelled as a vertical beam. Shear Wall assembly modelling as a combined unit to be represented by one beam element. The application of shear wall assembly is placed in elevator shafts in buildings or stairwell. [1]. In ETABS program, there are two types modelling shear wall are planar walls and wall assemblies. The analysis is based on three types of design section that are Simplified Compression (C) and Tension (T), Uniform Reinforcing and General Reinforcing. The purpose of this study is comparing the planar walls Simplified C and T with planar walls Uniform Reinforcing and wall assemblies Uniform Reinforcing. The conclusion for longitudinal reinforcement are, first, planar walls Simplified C and T is 40 to 96 % larger than wall assemblies, except pier P6 is 28 % smaller, second, planar walls Uniform Reinforcing is larger than 7 to 33 % wall assemblies Uniform Reinforcing, except pier P6 is 39 % smaller, third, the planar walls Simplified C and T, planar walls Uniform Reinforcing transversal reinforcement are 1 to 8 % larger than wall assemblies Uniform Reinforcing, except pier P6 is 51 % smaller.
Review of autonomous self-healing cementitious material
Authors: Susanto S A , Hardjito D , Antoni A
Published: November 2021

Concrete is a well-known versatile material, and its application is very common in most structures. Concrete performance is high in compression but low in tensile strength, this leads to the appearance of microcracks when the structure bears the designed loading. Such microcracks when ignored, leaves the structure vulnerable to attacks such as seepage of water, chlorides, and other materials that lead to a reduction in performance, and extreme cases failure of the structure. Since cracking is inevitable in concrete, new materials with self-healing properties are introduced into the mixture to take advantage of the external materials while making the concrete stronger. This type of concrete is widely researched from 1970 until the present day and is still in ‘proof of concept stages, and very few to no applications of autonomous self-healing concrete in real-world structures. This paper is an attempt to further classify the existing methodologies and find the gaps between researchers. The autonomous healing of concrete in present-day research varies in results; this means that the self-healing methodology requires standardization. Furthermore, self-healing in concrete does not mean maintenance is not required, it implies an easier maintenance method is possible due to the benefits gained through a possibly higher early cost in construction.
Optimization of concentrically braced steel frame structures based on SNI 1726:2019, SNI 1727:2020, SNI 1729:2020, and AISC 341-16
Authors: Aloysius J , Sumito J A , Prayogo D , Santoso H
Published: November 2021

Damages resulted from earthquakes are a loss in the economic sector. The structure of multi-story buildings needs an earthquake-proof design with higher performance to reduce such losses. By utilizing the metaheuristic algorithm, this study aims to identify the most compatible brace configuration and profile used in a concentrically braced steel frame structures with minimal total weight and that will meet the safety requirements. This algorithm is suitable owing to the fact that it is able to find solutions to any known optimization problem either through Particle Swarm Optimization (PSO), Symbiotic Organisms Search (SOS), or Differential Evolution (DE). The performance of these algorithms will demonstrated in a form of comparison through a case study of optimizing a 5-span, 6-story steel frame structure. These systems will determine the lightest frame weight, which also correlates to a lower construction cost, without compromising the constraints of SNI 1726:2019, SNI 1727:2020, SNI 1729:2020, and AISC 341-16. Based on the results of data processing, SOS is shown to achieve the highest algorithm performance compared to PSO and DE.
Investigation of the material mixtures and fiber addition for 3D concrete printing
Authors: Antoni A , Agraputra A , Teopilus D , Sunaryo A H , Mulyadi M M , Pudjisuryadi P , Chandra J , Hardjito D
Published: November 2021

The era of Construction 4.0 is characterized by technological advances used in the construction industry. One of the advancements is the use of 3D concrete printing in construction. However, until now, the development of 3D concrete printing in Indonesia is still minimal. The main challenge is to determine the composition of the material mixtures for making the mortar, having good extrudability but still has sufficient strength. The rapid initial setting time required was also different for the concrete for typical construction. Our previous mixture composition incorporating calcium oxide to accelerate the initial setting time was adequate. However, the extrusion process was still not satisfactory. In this study, the effect of cement to sand ratio, sand particle size, and the addition of synthetic micro-fiber was investigated on the main properties of 3D printing materials, i.e., initial setting time, flowability, extrudability, and compressive strength. It was found that using smaller maximum particle size sand increases the initial setting time. The addition of synthetic microfiber reduces the strength and the workability of the mortar. However, fiber inclusion has advantages as it reduces the possibility of cracking in the printed concrete. The extruded concrete specimens were shown to have significant strength reduction due to lack of compaction, and it was affected by the direction of printing showing orthotropic properties of the 3D printed concrete.
Designing louvers toward optimum daylight performance in Indonesia: a parametric study
Authors: Khidmat R P , Fukuda H , Kustiani  , Wibowo A P
Published: November 2021

Architecture has a strong relationship with the daylight universe. It implicates further occupants’ behaviour toward visual comforts, healthiness, and energy consumption. The daylight simulation in the early phase of design benefits the architect in predicting the possibilities of daylight-related target goals during the design process. A shading system is one of the strategies in approaching passive design to prevent an excessive amount of undesirable daylight intensity. This paper investigates different sun louvers shading patterns and their relation to the Useful Daylight Illuminance (UDI) in the context of Indonesia, presented by incorporating the EPW file of Jakarta. Parametric and multi-objective optimization has been used to optimize, explore, and map the design possibilities based on the louver shading component as dynamic parameters. Rhinoceros and Grasshopper, as parametric-based modelling software, were used as the primary modelling platform, while the Honeybee and Ladybug plugin were used to undergo the daylight-related environmental analysis. The design exploration iterates 2.160 design solutions with a value of dynamic parameters and the targeted UDI value embedded in each. The results show that the solution founded from iteration process has more areas of illuminance within 300 lx to 500 lx by about 15%.
The importance of iterative process in facade design optimization for a green office building in South Tangerang City
Authors: Fitria Dian
Published: November 2021

Currently, climate change and wellbeing provoke buildings to have higher sustainable performance. So, the condition expects that buildings can tackle those issues that benefit and less impact the environment and its occupants. This particular target needs integrated design approach that the role of the iterative process is necessary. The study focuses on the process of facade design for the buildings that are targeted to have sustainable performance. So, the design of the building facades shall be in accordance with the green building standard issued by GBC Indonesia, Greenship NB Version 1.2. The optimization of facade design was conducted based on three parameters: OTTV, daylight, and outside view. The minimum requirements for each parameter are 35 Watts/sqm for maximum OTTV, 30% for a minimum active area covered by daylight, and 75% for a minimum active area with an outside view. One of the aims of this study is to give a depiction of how to conduct a design process by using an iterative way. In addition, it is to identify the critical keys in enabling the building to the requirements.
Comparison of Shibataea kumasasa and Equisetum hyemale as vertical greenery system for thermal and light shade in student’s architectural design studio in Surabaya
Authors: Kristanto L , Canadarma W W , Wijaya E S
Published: November 2021

Vertical greenery system (VGS) is commonly used for facade shading. It has many advantages in its natural aesthetic, air filter, carbon sequestration, and many more. This research is the continuation of the previous research in 2019, which used Shibataea kumasasa as VGS. It was found that using Shibataea as VGS has reduced the indoor air temperature by 0.5-2°C on average, with 5°C maximum temperature difference. On the other hand, it decreased more light (in range 26-95%), made the illuminance of the room lower than the standard requirement. A studio room should have minimum 5% daylight factor or 500 lux, while on the room measurement, the lowest was 20 lux in the morning hours, the highest was only 200 lux in the afternoon. As an attempt to look for vegetation with better performance, this research uses another bamboo species, Equisetum hyemale to be examined and then being compared to Shibataea. The result is that for the thermal shade, Equisetum performs less effectively than Shibataea. As for light shade, the Shibataea reduces more illuminance than Equisetum, thus makes it a less favorable alternative. The balance of thermal-light effective performance maintained by the leaf area index can be the focus of future research.
An investigation into the effectiveness of student-led experiential learning for UG architects and the implications of incorporating AR into such pedagogical exercises
Authors: Wallwork M , Tedjosaputro M A , Xu Weishun
Published: November 2021

This paper focuses on a collaboration between three researchers from two universities in Zhejiang province to explore the pedagogical value of hands-on experiential learning using non-standard materials (in this case, bamboo). The second aim of the project was to explore how Augmented Reality (AR) might be used to improve the efficiency of the learning process for the participants. As a building project, the outcome was largely successful- the undergraduate (UG) student participants were able to construct a 4-metre-tall bamboo structure in the summer of 2020, using active bending, from a 3D computer model, within the timeframe. They were given complete autonomy as part of the project which resulted in problems but also arguably improved the learner autonomy and problem-solving abilities of the respondents over the timeframe. Concerning the use of AR in such projects, this researched identified the value for this purpose but also some very major obstacles, including cost and complexity.
A study of multi-sensory senses in museum virtual-visits
Authors: Damayanti Rully , Redyantanu Bramasta Putra , Kossak Florian
Published: November 2021

In the forced situation of living virtual during the recent pandemic, also human spatial perception needs to develop through experience and senses during virtual activities. People can go to new places using virtual media such as pictures, 360 panoramas, movies, Google Street View, and virtual tours while being physically separated and socially isolated. This also applies to museum visits when visitors can simply observe. This article offers data from a mixed-methods empirical study that examines how three Indonesian museums, Museum Pendidikan Surabaya, Museum Tsunami Aceh and Museum Bank Indonesia Jakarta, altered their perceptions in establishing a feeling of virtual space. The study has undertaken an identification of place descriptors related to senses multi-sensory systems. The respondents are young people in their twenties who have no prior museum experience. It demonstrates that in a virtual spatial experience, the respondents' perceptions are mostly influenced by the sensory system, which gets diverse information from the media, rather than social signals, which are frequently cited as the most important aspects in perceiving locations in real life. The component of familiarity (recalling memory) is also essential in detecting and identifying the sensory descriptors in this study. In a virtual spatial experience, all sensory systems perform differently; in this study, the visual and auditory sensory systems are the two strongest, while the chemical sensory system is the weakest. Virtual visits, although on a lesser scale than physical visits, can benefit from the multi-sensory system, which is crucial in museums.
Empowering female students to be successful professionals in the construction industry
Authors: Liem C. , Sunindijo R.Y. , Wang C.C.
Published: November 2021

The aim of this research is to empower female students who are studying construction related disciplines to be successful professionals in the Indonesian construction industry. The women’s empowerment is in line with the Indonesian Government’s long-term national development plan year 2005-2025. This research also contributes to improving the skills shortage in the Indonesian construction industry which has the biggest market share in Southeast Asia. This qualitative research employs semi-structured interviews with two groups of informants: female students in construction related disciplines and female leaders in the construction industry. A thematic analysis was then carried out to capture their key insights on factors that can empower female students and career success factors for women in the construction industry. The research findings contribute to advancing women’ empowerment principles, originally proposed by the UN Women Report (2018), by proposing four powerful principles to empower female students to be successful professionals in the Indonesian construction industry.
Causes of work accidents and its impact on the road and bridge construction projects
Authors: Latupeirissa Josefine Ernestine , Wong Irwan Lie K , Tiyow Herby C P
Published: November 2021

The work accident of road and bridge construction projects in Indonesia is quite severe. Every year there is always news about work accidents in the project. While the construction of roads and bridges, especially in Eastern Indonesia, continues to be carried out actively by the government. This research purpose of analyzing the causes of work accidents and their impact on the project. Data were collected at the research location, institutions related to the construction of projects, totaling 40 respondents. Based on the results of the analysis with a multiple linear regression method, it appears that 31 variables causing occupational accidents and 13 impact variables arising from accidents still occur and are very influential with high probability values. Four recommendations were made to prevent fatal accidents in the construction of roads and bridges, in Eastern Indonesia, to improve safety conditions in the construction industry.
Probability of willingness to pay road pricing based on the perspective of households in Jakarta
Authors: Bria M , Djakfar L , Wicaksono A
Published: November 2021

The determination of tariff is necessary for a city willing to implement electronic road pricing such as Jakarta. Therefore, this study was conducted to investigate the effect of household characteristics on the willingness and probability to pay more than IDR 20,000. The focus was on those commuting to work within the city where the majority of people work in the formal sector. Moreover, the Willingness to Pay IDR 20,000 was proposed as a variable while age, number of family members, income, vehicle ownership and the work type were used as the explanatory variables. The results showed the general effect of households in receiving ERP rates was low as indicated by the 16.9% recorded. However, family with total members of 4-5 people and owning a vehicle was observed to have a partially great and significant probability to increase the willingness to pay tariffs > IDR 20,000 while those earning income <IDR 5 million and working as private employees were discovered to have contributed negatively and significantly even though the probability was small. There is, therefore, the need for a comprehensive study when determining tariffs and the amount is recommended to be more expensive than public transport.
Fast and controllable synthesis of AB-stacked bilayer MoS2for photoelectric detection
Authors: Wang Shuang , Zhang Yanhui , Zhao Dongyang , Li Jing , Kang He , Zhao Sunwen , Jin Tingting , Zhang Jiaxiang , Xue Zhongying , Wang Ying , Sui Yanping , Chen Zhiying , Peng Songang , Jin Zhi , Liu Xinyu , Wang Jianlu , Chen Yan , Yu Guanghui
Published: November 2021

In recent years, researchers have explored the interlayer stacking structure of the bilayer (BL) transition metal dichalcogenides (TMDCs) and found that it has unique impact on the electrical, optical, and vibrational properties of TMDCs. Unfortunately, the size of BL TMDCs synthesized by the pre-existing methods is not large. In addition, there is not any effective mean to control the number of layers as well as the stack structure. This is the major limiting factor for further exploration of the properties of BL TMDCs. We report a new method for the rapid and controllable growth of AB-stacked BL MoS2. Firstly, the mixed solution of Na2MoO4and NaOH was spun on the sapphire substrate and then sulfurated. The BL MoS2of AB-stacked can be obtained by changing the time of sulfur introduction. The size of the BL MoS2is related to the parameters of sulfur. The maximum size of BL MoS2grown by this method can reach 288μm, and the average size can reach about 200μm, which is larger than the size reported in most articles. In addition, the growth rate of BL MoS2can be clearly increased by the spin-coating growth method and the fastest growth rate is up to 144μm min−1, which is far higher than other published reports at present. Subsequently, a photodetector based on BL MoS2was prepared. The response time of rising edge is about 0.32 ms, and that of falling edge is about 3.2 ms. The detector prepared by us shows excellent photoelectric detection performance. Therefore, the excellent performance of BL MoS2makes it have a broad application prospect in the field of high-performance electronics and optoelectronics.
Preparation and antibacterial activity of graphene oxide/cuprous oxide/zinc oxide nanocomposite
Authors: Li Manna , Chen Zhaofeng , Sun Yu , Wang Fei , Wu Cao , Xu Jiang , Zhang Jianxun
Published: November 2021

In this study, an antibacterial GO/Cu2O/ZnO nanocomposite was synthesized by a hydrothermal synthesis method, and its phase and microstructure were characterized by a series of test methods. The results showed that the synthesized cuprous oxide nanoparticals and the added zinc oxide nanoparticals were uniformly dispersed on the surface of graphene oxide, and did not cause the agglomeration of the nanoparticles. The graphene oxide successfully made enhanced the effective surface area of the metal oxide nanoparticles due to its adsorption capacity and chargeability. Thereby enhancing the antibacterial activity of the nanocomposite, reaching a 100% antibacterial rate.
Microstructural evolution and its influence on oxygen diffusion in yttrium-doped ceria thin films
Authors: Li Jinzhan , Lei Li , Li Limin , Deng Bo , Zhao Gaoyang , Jin Lihua , Li Chengshan
Published: November 2021

Ceria doped with rare earth ions (Ce1−xMxO2−y (y = x/2)), which contain many oxygen vacancies, have become excellent electrolyte materials for solid oxide fuel cells and important buffer layers for coated conductors. In this paper, Y3+ ions were doped into the lattice of CeO2 to form Ce1−xYxO2−y (CYO) thin films regarded as buffer layers to reduce oxygen diffusion on silicon substrates. It was revealed that the CYO films gradually transformed from a complete fluorite structure into a defective fluorite structure with more and more oxygen vacancies as the proportion of Y3+ ions in CYO films increased from zero, and then the defective fluorite structure transformed into rare earth C-type structure when the proportion of Y3+ ions was beyond 0.5. Moreover, at the beginning, the degree of oxygen diffusion showed an uptrend; but after the proportion of Y3+ ions reached a certain value, the degree of oxygen diffusion turned into a downtrend.
Influence of Thomson effect on amorphization in phase-change memory: dimensional analysis based on Buckingham’s П theorem for Ge2Sb2Te5
Authors: Yamamoto Takuya , Hatayama Shogo , Song Yun-Heub , Sutou Yuji
Published: November 2021

To evaluate the Thomson effect on the temperature increase in Ge2Sb2Te5 (GST)-based phase-change random access memory (PCRAM), we created new dimensionless numbers based on Buckingham’s П theorem. The influence of the Thomson effect on the temperature increase depends on the dominant factor of electrical resistance in a PCRAM cell. When the effect is dominated by the volumetric resistance of the phase-change material

C
=

ρ

c

Δ
x
/
σ

≪
O

(
1
)

,

the dimensionless evaluation number is

B
=

μ

T

σ
Δ
ϕ

k

,

where ρ
c is the contact resistance, Δx is the thickness of PCM, σ and k are the electrical and thermal conductivities, μ
T is the Thomson coefficient, and Δϕ is the voltage. When the contact resistance cannot be ignored, the evaluation number is B/(1 + C). The characteristics of hexagonal-type crystalline GST in a PCRAM cell were numerically investigated using the defined dimensionless parameters. Although the contact resistance of GST exceeded the volumetric resistance across the temperature range, the ratio of contact resistance to the whole resistance reduced with increasing temperature. Moreover, increasing the temperature of GST enhanced the influence of the Thomson effect on the temperature distribution. At high temperatures, the Thomson effect suppressed the temperature increase by approximately 10%–20%.
Theoretical studies of unimolecular decomposition of thiophene at high temperatures
Authors: Naz Erum Gull , Paranjothy Manikandan
Published: November 2021

Thiophene is an organo-sulfur aromatic molecule present in fossil fuels and alternate fuels such as shale oils and contributes to air pollution via fuel burning. Hence, it is essential to remove thiophene and its derivatives during the refining process. In this regard, experimental and electronic structure theory studies investigating the thermal decomposition of thiophene have been reported in the literature. In the present work, high temperature thermal decomposition of thiophene was investigated using Born–Oppenheimer direct dynamics simulations. The trajectory integrations were performed on-the-fly at the density functional B3LYP/6-31+G*level of electronic structure theory to investigate the atomic level decomposition mechanisms. Simulation results show that C–S cleavage accompanied by an intramolecular proton transfer to C is the dominant initial dissociation step. Acetylene was observed as primary decomposition product and the results are in agreement with previous experimental studies.
Localized electrodeposition micro additive manufacturing of pure copper microstructures
Authors: Ren Wanfei , Xu Jinkai , Lian Zhongxu , Sun Xiaoqing , Xu Zhenming , Yu Huadong
Published: November 2021

The fabrication of pure copper microstructures with submicron resolution has found a host of applications, such as 5G communications and highly sensitive detection. The tiny and complex features of these structures can enhance device performance during high-frequency operation. However, manufacturing pure copper microstructures remain challenging. In this paper, we present localized electrochemical deposition micro additive manufacturing (LECD-μAM). This method combines localized electrochemical deposition (LECD) and closed-loop control of atomic force servo technology, which can effectively print helical springs and hollow tubes. We further demonstrate an overall model based on pulsed microfluidics from a hollow cantilever LECD process and closed-loop control of an atomic force servo. The printing state of the micro-helical springs can be assessed by simultaneously detecting the Z-axis displacement and the deflection of the atomic force probe cantilever. The results showed that it took 361 s to print a helical spring with a wire length of 320.11 μm at a deposition rate of 0.887 μm s−1, which can be changed on the fly by simply tuning the extrusion pressure and the applied voltage. Moreover, the in situ nanoindenter was used to measure the compressive mechanical properties of the helical spring. The shear modulus of the helical spring material was about 60.8 GPa, much higher than that of bulk copper (∼44.2 GPa). Additionally, the microscopic morphology and chemical composition of the spring were characterized. These results delineate a new way of fabricating terahertz transmitter components and micro-helical antennas with LECD-μAM technology.
Effect of sand mining on the flow hydrodynamics around an oblong bridge pier
Authors: Lade Abhijit D , Taye Jyotismita , Kumar Bimlesh
Published: November 2021

Extraction of sand from riverbed has catastrophic repercussions on aquatic animalia habitat, water quality, and the environment. Alongside, physical alterations in the fluvial hydraulics arising on account of sand mining are also worthy of attention. Flows passing over the pits excavated in a channel have enhanced erosive propensity, which can be a cause of concern for the downstream hydraulic structures. The complex nature of flow interacting with the bridge piers after passing over a mining pit is not fully understood. Experiments were conducted to apprehend the effects of a dredged pit on the turbulence flow-field around an oblong pier. Flow was passed in an erodible sand bed rectangular channel having an oblong pier for the first case. In the second case, a pit was dredged in the mobile bed to replicate a mined channel, and the pier was subjected to the same discharge. The streambed at the approach of the pier experiences greater mean bed shear because of dredging. The amplification of the instantaneous bed shear beneath the turbulent horseshoe vortex (THSV) zone at the pier front is almost twice due to channel dredging. The findings can be useful in understanding the streambed instabilities around bridge piers in mining-infested channels.
Planar narrowband Tamm plasmon-based hot-electron photodetectors with double distributed Bragg reflectors
Authors: Shao Weijia , Liu Tingting
Published: November 2021

Hot-electron photodetectors (HE PDs) are attracting a great deal of attention from plasmonic community. Many efficient HE PDs with various plasmonic nanostructures have been demonstrated, but their preparations usually rely on complicated and costly fabrication techniques. Planar HE PDs are viewed as potential candidates of cost-effective and large-area applications, but they likely fail in the simultaneous achievement of outstanding optical absorption and hot-electron collection. To reconcile the contradiction between optical and electrical requirements, herein, we propose a planar HE PD based on optical Tamm plasmons (TPs) consisted of an ultrathin gold film (10 nm) sandwiched between two distributed Bragg reflectors (DBRs). Simulated results show that strong optical absorption (>0.95) in the ultrathin Au film is realized. Electrical calculations show that the predicted peak photo-responsivity of proposed HE PD with double DBRs is over two times larger than that of conventional single-DBR HE PD. Moreover, the planar dual-DBR HE PDs exhibit a narrowband photodetection functionality and sustained performance under oblique incidences. The optical nature associated with TP resonance is elaborated.