bluuebunny/crossref_metadata_2025 huggingface dataset:
Assessing enablers to a circular economy in Indonesian furniture industry using Fuzzy-DEMATEL
Authors: Wicaksono P A , Naufal T R , Saptadi S , Susanty A
Published: November 2021

The furniture industry is one of the leading sectors and has a positive trend in Indonesia’s industrial sector. However, currently, there is a gap between supply and demand for timber and environmental impacts problem. The circular economy model entered as a restorative or regenerative concept to optimize resources and waste minimization. This research is conducted to assess the factors that drive the implementation of circular economy in the Indonesian furniture industry. The Fuzzy-Dematel was used to find the factors that were contributing to the implementation of the circular economy. As a result, the cause group consists of knowledge of circular economy, government support & legislation, consumer awareness, the business principle for the environment, and scarcity of resources. Furthermore, the effect group consists of resources efficiency, economic (financial), technology availability, environmental safety & management, customer-supplier collaboration, corporate image, consumer demand, increased value products, and cost reduction. In addition, some strategies for the government and industry were proposed for circular economy implementation in the Indonesian furniture industry.
Estimation of greenhouse gas emission from household activities during the COVID-19 pandemic in Binjai City, North Sumatera
Authors: Suryati I , Hijriani A , Indrawan I
Published: November 2021

Household activities have the potential to produce greenhouse gas emissions. The government’s policy to work and study from home during the COVID-19 pandemic affects greenhouse gas emissions produced by household activities, starting from energy and waste and liquid waste produced, so it is necessary to carry out an emission inventory. The purpose of this study is to calculate greenhouse gas emissions (CO2 and CH4) from household activities in Binjai City during the COVID-19 pandemic and determine emission reduction scenarios that can be carried out in Binjai City. The calculation method used is based on the 2006 IPCC (Intergovernmental Panel in Climate Change) guidelines. CO2 emissions resulting from the use of LPG are 2025.80 tons CO2e/month, the use of fuel for daily transportation activities is 3484.84 tons CO2e/month, and electricity usage is 14956.66 Ton CO2e/month. CH4 emissions produced from domestic liquid waste are 417.14 tons CO2e/month, and household waste is 27.54 tons CO2e/month. The COVID-19 pandemic increases GHG emissions from household electricity consumption in Binjai City by ± 7% and reduces GHG emissions from fuel consumption by 3.5%.
Research trend on sustainable architecture: a bibliometric analysis emphasizing on building, material, façade, and thermal keywords
Authors: Pramesti P U , Hasan M I , Ramandhika M
Published: November 2021

Studies about sustainable research remain increase recently due to the global trend and movement on greener lifestyles. Keywords on building, material, façade, and thermal represent the current issue in sustainable architecture. This study aims to trends in sustainable architecture research with specific keywords and periods. Publishing period between 1976-2020 with particular limitation applied to emerge 859 publication documents to be analyzed. Scopus’ on-site analysis system and VOSviewer were employed to generate graphical and visual analysis on research trends. The analysis results generate five significant research clusters: energy, façade technology, measurement, thermal, and climate. Besides groups, the analysis also indicates that most of the countries involved were from Europe. Hence, the conclusion of this study reveals potential research on a similar topic in tropical countries which demanding sustainable building encounters a humidity challenge. This study fills the gap in the bibliometric analysis regarding sustainable architecture with specific keywords and publishing period.
Environment carrying capacity of Pandawa Beach ecosystem and how to optimize it to support sustainable development
Authors: Sumantra K , Wijaya I M W
Published: November 2021

Tourist visits to Pandawa beach in 2017-2018 experienced a very sharp increase reaching 273%. It is necessary to analyse the environment’s carrying capacity as a basis for planning and the right strategy in its management. The purpose of the study was to analyse the environmental carrying capacity of the Pandawa coast, Kutuh Village, Badung Regency and their utilisation strategies for sustainable development. The study examined the physical carrying capacity (PCC), actual carrying capacity (RCC), management capacity (MC), and adequate carrying capacity (ECC). The results showed the current number of actual visitors with an average of 3,727 visitors/day, which is still far below the physical carrying capacity, which is 20,618 visitors/day, while the actual carrying capacity is 18,864 visitors/day. So, the estimated amount visits per month that can be received is as many as 565,927 visitors/month. At the same time, the ECC value of the number of tourist visits can still be optimised by 109 visitors/day. It means that the number of officers currently available is quite capable of serving 3,727 visitors/day. The strategies to optimise the visit are the addition of facilities, tourist attractions, promotions and increasing the role of local communities in environmental preservation.
Reduction of waste generation to extend the lifetime of landfill: review
Authors: Prasasti R A , Budihardjo M A , Samadikum B P
Published: November 2021

The increasing number of people in Indonesia, one of which is the city of Semarang, has led to increased community activities. Increased community activities will affect the increase in the amount of waste production. It will also impact the service life of the landfill, so efforts need to be made to extend the service life of the landfill. Efforts can be made to reduce the amount of waste that goes to the landfill, usually by sorting organic and inorganic waste. Reducing the amount of waste can also be done by utilizing waste that has been buried in the landfill (TPA), then processed into alternative fuels or RDF (Refused Derived Fuel). Waste reduction by sorting organic and inorganic waste has been carried out in several places, namely Putri Cempo TPA, Milangsari, and Sukoharjo, with percentage reductions of 79.6%, 35%, and 58%. Meanwhile, the use of waste into fuel or RDF (Refuse Derived Fuel) can also be used as an effort to extend the service life of the landfill because waste that has been buried for a long time has a high calorific value so that it meets the requirements as fuel for the pyrolysis process.
The Sendai Framework for disaster risk reduction: Insight from Covid-19 in Balikpapan City, Indonesia
Authors: Ariyaningsih  , Sukmara R B , Pradita L
Published: November 2021

The Sendai Framework for Disaster Risk Reduction 2015-2030 (SFDRR) serves as the international standard for disaster risk reduction. The SFDRR places a new emphasis on risk reduction during the post-disaster recovery phase. Additionally, SFDRR encourages tangible and verifiable outcomes for catastrophe loss reduction, such as indicators for tracking progress toward seven global targets. The purpose of this article is to map the current response to the biological disaster (Covid-19) in the City of Balikpapan, Indonesia, for the Sendai Framework, using academic literature and publicly available data from governments and organizations. To provide timely responses to COVID-19 at the municipal level, this study conducted a rapid examination of newly available information from the Balikpapan government and other sources. According to the analysis’s findings, Covid 19 will have ramifications for the Sendai Framework unless the government adopts necessary legislation to keep the Sendai Framework on track. SDFRR was used to detect COVID-19 responses in Balikpapan City, although one target in the SFDRR is unclear or unidentified. Despite the fact that this goal, “Improving Disaster Preparedness for Effective Response and “Building Back Better” in Recovery, Rehabilitation, and Reconstruction,” is crucial to the Sendai Framework’s success.
Process improvement design at PT URW using failure mode and effect analysis
Authors: Bakhtiar A , Nurwidanto I W , Hartini S , Wicaksono P A
Published: November 2021

PT URW is a company engaged in the textile sector that processes yarn into semi-finished fabrics. Such is the case that PT URW has a problem with its waste materials. To address this, the researcher has implemented the method of failure mode and effect analysis (FMEA). In data collection and processing, the researcher defined the problem, collected data, took measurements using the critical waste method, and interpreted the data into the Pareto Chart. The area that had the greatest value was continued to the analysis stages of critical waste analysis, FMEA analysis, and alternative solutions. The research was concluded by providing corrective solutions based on the potential causes that had been found in the previous stage and by validating the formed planned improvements.
Study on waste bank capacity building plan and development strategies in Semarang City
Authors: Sinaga M L A , Madaningrum F R , Siagian R T , Samadikun B P , Sumiyati S
Published: November 2021

Waste is one of the problems in Indonesia. Waste that is not managed correctly can lead to waste generation. One of the methods to reduce waste is the 3R System through a waste bank. However, the reality that happens in the field is that many waste banks are challenging to develop. This plan aims to plan the concept of capacity building and formulate waste bank strategies in Semarang City, especially the Banyumanik, Tembalang, and Tugu Sector. The methods used in this planning are waste sampling (SNI 19-3964-1994), recycling rate, and SWOT analysis. This planning shows the same trend that the largest inorganic waste generation in Banyumanik Sector is cardboard by 23%, in Tembalang Sector and Tugu Sector are also cardboard by 32% and 24%. For the next five years, the planned recycling rate has met 50%, namely for Banyumanik sector at 57.79%, Tembalang sector at 61.19%, and Tugu sector at 58.69%. The SWOT analysis found that there are four strategies for developing waste banks: the preparation of an organized and systematic flow of inorganic waste sales, formation of diversified activities, completeness of documents, and cooperation with third parties.
Epididymal sperm quality of Kacang goat preserved in low temperature for genetic material utilization in assisted reproductive technologies
Authors: Prastowo S , Nugroho A F , Widyastuti R
Published: November 2021

Postmortem epidydimal preservation at low temperature (3-4°C), is a way to preserve and recover male genetic material. This effort aims for prolonging male function as sperm source, followed with its utilization in assisted reproductive technologies. This study aimed to observe the quality of sperm form cauda epididymis which preserved at low temperature for consecutive days. Sperm were retrieved from twelve cauda epididymis of Kacang Goat and its qualities namely motility, intact membrane, life/dead, and abnormality (all in %) were evaluated in every 2 days until 0% motility. Data were compared using analysis of variance at a = 0.05. Result shows significant (P<0.05) decrease in motility, intact membrane, and life/dead, but increase in abnormality during observation at day 0, day 2, day 4 and day 6, respectively. At the respective days, motility was 91.33±1.25%; 74.67±3.88%; 28.17±2.25% and 0.33±0.57%, intact membrane was 54.83±1.04%; 39±3.77%; 25.1±3.32% and 14.83±2.75%, life/dead was 55.17±4.01%; 36±3.5%; 24.3±3.25% and 12±2.78%, abnormality was 3.16±0.76%; 4.16±0.76%; 6.16±2.25% and 11±2.17%. According to the study, it is concluded that preserved sperm from cauda epididymis at low temperature shows decrease in quality and its utilization should rely on the quality status to select the most appropriate assisted reproductive technology.
Study association of bPRL (Bovine Prolactin) gene and milk production trait in Indonesian Holstein dairy cattle
Authors: Hifni B , Pambuko G , Lestari R E P , Herowati N , Vanessa R , Widayanti S , Widyas N , Prastowo S
Published: November 2021

This study was aimed to analyze the genetic variation of bPRL (Bovine Prolactin) gene and its association to milk production in Indonesian Friesian Holstein (IFH) dairy cattle. In total 49 DNA from whole blood were extracted and followed with PCR-RFLP to distinguish the genotype difference between individual samples. The fragment of bPRL gene was amplified using pair of primer forward 5’-GAGTCCTTATGAGCTTGATTCTT-3’ and reverse 5’-GCCTTCCAGAAGTCGTTTGTTTTC-3’, resulting in 156 bp PCR product size. DNA digestion then performed using RsaI restriction enzyme that recognizes 5’-GT↓AC-3’ sites with blunt-end termini. According to the study, two genotypes were discovered that are AA and AB, with respective frequencies of 0.84 and 0.16. Based on the genotype grouping of milk production data, AB genotype yielded 4016.63±1344 kg while AA genotype yielded 3314.32±1153 Kg of milk per lactation. However, there is no statistical (P>0,05) difference between both genotypes on the amount of milk yielded. It is concluded that bPRL gene was not associated with milk production traits in the studied Indonesian Dairy Cattle population.
Application of logistic model to predict egg production pattern of quails given a low-energy diet supplemented with methionine
Authors: Pradista L A , Veronica M , Widyas N , Prastowo S , Ratriyanto A
Published: November 2021

Tropical countries such as Indonesia face high temperatures, which impact the energy utilization in poultry. This study aims to predict the egg production pattern of quail supplemented with methionine in a low-energy diet. In total, 204 laying quails were divided into two treatments: Control (T0) and 0.12% methionine supplementation (T1). After three weeks adaptation period, daily egg production data were collected for two periods of four weeks each (treatment period week 4-11). The t-test was applied to analyze the egg production data. Egg production patterns were predicted using logistic regression. The egg production pattern of T1 showed a significant increase compared to T0 during the treatment period (p<0.01) and overall period (p<0.01). Peak production from T0 and T1 was 59.14% vs. 66.82%, with a production rate of 0.22 vs. 0.18 and prediction accuracy of 91% vs. 86%, respectively. In conclusion, methionine supplementation to a low-energy diet increased egg production of quails.
Egg production parameters of quails receiving dietary betaine supplementation with different floor space in a tropical environment
Authors: Anggraini F T , Pamungkas S A , Putra D A , Rantau G M , Masykur A , Prastowo S , Widyas N , Ratriyanto A
Published: November 2021

This study investigated the effect of dietary betaine supplementation and floor space on quail egg production parameters. With six replicates, four hundred fifty-six quails (21-day-old) were randomly assigned to a 2×2 factorial arrangement. The first factor was floor space of 225 cm2 (F1) and 164 cm2 (F2) by allocating 16 and 22 birds per cage (size: 3600 cm2). The second factor was dietary betaine supplementation at 0% (CON) and 0.15% (BET). Egg production was collected in 2 periods (2×28 days) starting from 43 days old. The age of the first production, 10%, 50%, and peak production, was also recorded. There is an interaction between dietary betaine supplementation and floor space on the age of productive parameters, where quails receiving betaine supplementation reached faster 50% production and peak production (p<0.05). Furthermore, the F1 group had a higher average egg production than F2 (p<0.05). BET group had a higher average egg production than CON (p<0.05). Thus, floor space 225 cm2 can be applied in the tropics provided the quails received dietary betaine supplementation.
Hematological status and egg production of laying hen with probiotic powder as feed supplements
Authors: Adriani L , Latipudin D , Joni I M , Panatarani C , Sania G
Published: November 2021

The study aimed to observe the effect of adding probiotic powder on the hematological status and egg production in layer-phase laying hens. This research was conducted for 30 days, located in a layer farms in Sumedang Regency, West Java. The production of probiotic powder was carried out at the Central Laboratory, Padjadjaran University. The blood was analyzed at the Multitest Commercial Laboratory, Margahayu Raya, Bandung City. The variables observed in this study were the levels of erythrocytes, leukocytes, hematocrit, and egg production in layer-phase laying hens. This study used an experimental method with statistical analysis using a completely randomized design (CRD) with four levels of probiotics (0%, 2%, 3%, 4%) and five replications. The research data were analyzed using the 0.05% Variety Print Test. The result of this research showed that the addition of probiotic powder gave the same effect on the levels of erythrocytes, leukocytes, and hematocrits of laying hens. However, probiotic powder increased egg production along with the addition of the dose of probiotic powder. It can be seen that 2%, 3% and 4% probiotic powder increased 64.1%, 41.5% and 118% egg production compared to control.
Assisted reproductive technology in tropical animals: Case in Pasundan cattle genetic conservation and utilization
Authors: Widyastuti R , Pristihadi D N , Prastowo S , Maheshwari H , Sumantri C , Boediono A
Published: November 2021

Pasundan cattle are native Indonesian cattle located in West Java, Indonesia. These cattle have a superior trait in reproductive performance although reared in extreme environmental conditions with low-quality of feed, and resistance to parasite diseases than other cattle breeds. However, the ability to maintain Pasundan cattle genetic diversity, avoiding inbreeding, keeping the population healthy, and high reproduction efficiency are among the significant challenges currently occurred. The application of assisted reproductive technology (ART) seems promising to overcome those challenges and would impact the efficiency of genetic diversity conservation and preservation. This review aims to present the possibility to use the available ART in Pasundan cattle. The ART reviewed are the advanced technology of sperm cryopreservation, sex selection, artificial insemination, and in vitro embryo production. The sperm cryopreservation combined with sperm sexing is the most promising technology to maximize the use of genetic material of Pasundan cattle. Moreover, sexed sperm would have a promising impact on artificial insemination and/or embryo production to increase the cattle population. Furthermore, to protect genetic diversity, it is possible to apply the artificial reproductive technique and sperm or embryos conservation for genetic utilization in the future.
Reproductive characteristics of female swamp buffalo reared under Kalang production system in South Kalimantan
Authors: Widi T S M , Pratowo S , Sulaiman A , Hulfa R , Sumantri I
Published: November 2021

Swamp buffalo has been an integral component of society in the swamp area in South Kalimantan. The system is characterized by 2-5 farmers rearing herds semi intensively in one shared kalang, a traditional wooden shelter on swamp area. This study was aimed to determine the reproductive characteristics of female swamp buffalo under kalang systems in Hulu Sungai Selatan Regency, The Province of South Kalimantan. The data of reproductive characteristics and farming systems were collected through interviewing 21 farmers in 4 kalang groups who kept 351 buffaloes (153 of them were females). The observed parameters were average of productive females ages, age at first mating, calving interval, post-partum estrus (PPE), percentages of pregnant and lactating cows. Results showed that the average of productive female buffalo ages was 9.9 ± 0.99 years; female swamp buffaloes were first mating at 51.4 months; first calving at 63.4 months; calving interval was 16.5±0.70 months; PPE was 4.9±0.64 month; gestating and lactating cows were 21.6% and 60.1%, of the productive female population, respectively. We concluded reproductive characteristics of female swamp buffalo under kalang production systems can be enhanced through improvements of the production system, including pre-weaning calf management, feed supplementation, and health care practices.
Superovulation response of Peranakan Ongole (PO) and Simmental cows after FSH stimulation in multiple ovulation and embryo transfer program
Authors: Lubis A F , Satyaningtijas A S , Lubis O P , Kurniati W , Boediono A
Published: November 2021

Multiple ovulation and embryo transfer (MOET) is a reproductive technology to increase the livestock population in a short period. The success of ovary stimulation programs is influenced by an individual’s response to follicle-stimulating hormone (FSH) stimulation. In this study embryo production was carried out on local cows represented by Peranakan Ongole (PO) cows and exotic cows represented by Simmental cows. FSH stimulation was performed on 10 PO cows and 10 Simmental cows. On Day-1 Cue Mate® (progesterone) was inserted intravaginally. FSH injection (400 mg) was carried out intramuscularly from D-10 at reduced dose with 12 hours intervals (Day-10: 100 mg; Day-11: 60 mg; Day-12: 40 mg per injection). On Day-12, prostaglandin (PGF2α) was injected and Cue Mate® was removed. Artificial insemination (AI) was performed 48 hours after PGF2α injection for 3 times at 12 hours intervals. The embryo was collected 6 days after the last AI (Day-21). Superovulation response was detected on 70% of PO cows and 90% of Simmental cows. The average number of transferable embryos in Simmental cows (9.11±7.27) was higher than PO cows (7.86±7.78). This research shows that Simmental cows are more responsive to FSH stimulation, and can produce more transferable embryos than PO cows.
Addition of bidara leaves (Ziziphus spina – christi L.) in drinking water on production and mortality of broiler chickens
Authors: Yusup F H , Frasiska N , Rahayu N
Published: November 2021

The bidara plant is known as a plant that contains active ingredients and phytochemicals that have the benefit of stimulating physiological processes in the body to run well and have a healthy effect. This study aimed to determine the effect of giving bidara leaf extract on the production performance and mortality of broiler chickens. A total of 60 DOC broiler chickens were used in this study with an average body weight of 45 g which was divided into 4 treatments, including T0: control, T1: 10% bidara leaf extract, T2: 15% bidara leaf extract, T3: 20% bidara leaf extract. Each treatment was repeated 5 times with 3 research units per plot. The study was carried out experimentally in vivo using the Completely Randomized Design (CRD) research method. The data was processed by analysis of variance with the F test at the 5% level and continued with Duncan’s test. The results showed that the treatment had a significant effect (P<0.05) on production performance and mortality in broiler chickens at the 10% bidara leaf usage level. The use of bidara leaf extract can be used as a supplement in the maintenance of broiler chickens as a substitute for synthetic supplements.
Determinants of rice by-product utilization as a potential local feed for ruminants in Magelang Regency, Indonesia
Authors: Widarni N A A , Astuti A , Andarwati S , Kusumastuti T A , Putra A R S
Published: November 2021

This study was conducted to determine the factors that influence farmers in using rice straw as feed for their ruminants. Primary data was obtained from a survey through face-to-face interviews involving a total of 395 farmers as respondents in Magelang Regency, Central Java, Indonesia. Farmers were selected by multistage random sampling. The data, then, were analyzed by using logistic regression. The results showed that 45.06% (178 respondents) used rice straw as feed, where only 3.37% (6 respondents) adopted the fermented straw. The type of ruminant kept by farmers, the amount of training attended, and land size affected the rice straw utilization as ruminants feed. Adopters of rice straw utilization are farmers who maintain large ruminants and tend to manage large areas of land. This finding also revealed that providing continuous training on feed technology for farmers is important. Furthermore, periodic assistance by extension workers is needed to enhance farmers in adopting the innovation of agricultural technology.
The effect of using complete feed containing protected soybean groats on the carcass production of thin tailed lambs
Authors: Arif Y N , Pramono A , Riyanto J
Published: November 2021

This study was conducted to determine the effect of using complete feed containing protected soybean groats on fat-tailed lamb carcass production. A total of 9 thin-tailed lambs aged 12 months were divided into 3 groups of ration treatment: the first group only received a 100% complete feed ration (P1), the second group received a 90% complete feed ration, and 10% protected soybean groats (P2), while the third group received 80% complete feed and 20% protected soybean groats (P3). Data were analyzed using a Completely Randomized Design. Differences between treatments were further tested with Duncan’s Multiple Range Test. The results showed that complete feeds containing protected soybean groats on fat-tailed lamb carcass production had no significant effect on carcass weight, carcass percentage, carcass size, percentage of carcass size, meat weight, meat weight percentage, fleshing index, but had a significant effect on carcass production. We concluded that the use of complete feeds containing protected soybean groats increased carcass production of male fat-tailed lamb.
Potential of gathot (fermented cassava) from livestock feed to analog rice
Authors: Ratnaduhita A , Pratama Y , Nuhriawangsa A M P , Pramono Y B , Kartikasari L R
Published: November 2021

The objective of this research was to analyze the potential of gathot as an analog rice ingredient with the addition of red bean CMC as a binder, according to water absorption value, crude fiber content, and aftertaste by hedonic test. This study consisted of 4 treatments, and each treatment was repeated 5 times. The treatment was the addition of CMC in the manufacture of analog rice made from gathot flour and red bean flour with a level of 0; 1; 2; 3%. The test includes water absorption, crude fiber content, and aftertaste with a hedonic test. The data were analyzed by Completely Randomized Design (CRD) and processed using SPSS 23.0. Gathot’s analog rice showed water absorption 49.37%, crude fiber content 0.57 g/mL, and aftertaste 3.24. Gathot’s analog rice with the addition of red bean flour and CMC as binder influences the water absorption value and crude fiber content. The optimal concentration of CMC in gathot’s analog rice is 1%, with the water absorption value of 163.37% and crude fiber content of 5.37%.
A comparative study of several nature-inspired algorithms in steel deck floor system cost optimization
Authors: Emanuel T , Hadrian  , Prayogo D , Wong F T
Published: November 2021

Steel deck floor systems can be considered as one of the main components of a structure. As technology advances, the role of optimization is used in many aspects of structural designs. Steel deck floor systems are one of many components that are usually optimized to look for its optimum cost but are still able to hold the structure. This study compares the performance of the particle swarm optimization (PSO), artificial bee colony (ABC), differential evolution (DE), and symbiotic organisms search (SOS), that categorized as nature-inspired algorithms, in the optimization of a steel deck floor system. The variables considered are the edge beams, interior beams, and the composite steel deck. The results show that the SOS gives the most optimum cost with a better average and a perfect success rate.
The effect of crumb rubber in dense graded and open graded cold mixture asphalt
Authors: Wulandari P S , Tjandra D
Published: November 2021

Recycling tires is one of the eco-friendly way for reducing environmental problems. Incorporating crumb rubber in asphalt mixtures is an alternative way for reusing the end-of-life tires in road construction. The main purpose of this study is to evaluate the cold mix asphalt incorporating crumb rubber as a substitute for a part of fine aggregates. In this study, the aggregate gradations for mix design were selected according to the specification, Dense Graded Emulsion Mixtures (DGEM) Type IV and Open Graded Emulsion Mixtures (OGEM) Type E/20. The design bitumen content in this study was optimized for stability, void in mixture (porosity), and density. Crumb Rubber (CR) emulsion mixtures were made with optimum bitumen content at 8% by mass of total mixture for DGEM and OGEM. In order to incorporate crumb rubber into the cold emulsion mixtures, laboratory testing were performed for 25% and 50% of fine aggregates replaced with an equal volume of crumb rubber. In general, CR emulsion mixtures showed good results in all parameters. The CR emulsion mixtures also had a good comparison to hot mix asphalt specification for medium volume traffic loads with porosity less than 10%. From this study, crumb rubber can be recommended as a substitution material of fine aggregates in cold mix asphalt.
Modeling and analysis of 3D-printed reinforced and prestressed concrete beams
Authors: Chandra J , Wibowo H , Wijaya D , Purnomo F O , Pudjisuryadi P , Antoni A
Published: November 2021

Three-dimensional (3D)-printed concrete is believed to have a significant impact in the construction industry in the future. Some research has been conducted experimentally and analytically to investigate the structural behavior of 3D-printed concrete elements, such as beams. Previous study by the authors attempted to analytically model 3D-printed reinforced concrete (RC) beams failing in flexure that were tested by other researchers. The study was done with the aid of a finite element software. However, there are some limitations of the analytical model to simulate the failure mode of the specimens. In this study, an improvement of the analytical model is proposed in order to simulate the behavior of the 3D-printed RC beams more accurately. Furthermore, the analysis was also expanded for 3D-printed prestressed concrete (PC) beam. From the analysis results, it can be concluded that the improved analytical model is able to predict more accurately the failure mode as well as the hysteretic behavior of the 3D-printed RC beams. Nevertheless, a more sophisticated analytical model is needed to improve the accuracy of the prediction for the 3D-printed PC beam.
Experimental study on ventilation using earth-to-air heat exchanger in Surabaya
Authors: Juniwati A , Mintorogo D S , Abednego A E , Kurnia S , Handoyo E A
Published: November 2021

The main problem related to thermal condition in Surabaya as a second-largest city in Indonesia is humid and hot. It is a typical condition of tropical climate. Ventilation in the hot day will bring warm and humid outdoor air into a room. It will increase the temperature of air in the room. One of some efforts to reduce the outdoor air temperature is using an earth to air heat exchanger (EAHE) to transfer heat from the air to the earth or ground. This paper will discuss about research done to study the effect of EAHE to a room temperature. The study used two model rooms which are similar and a model EAHE. One room called condition room will receive air flowing from the EAHE pipe and the other room is called the referent room. From the research, it is found that the air in condition room with EAHE is cooler in the daytime compared to the referent room. The temperature of the condition room with EAHE is more stable.
Comparison of simulation-based methods and metaheuristic optimization algorithms for optimizing window design by considering daylighting and heat transfer in a tropical region of Indonesia
Authors: Budhiyanto A , Oktavianus A , Tedjokusumo B , Harsono K , Yang I T
Published: November 2021

This study presents evaluation and comparison of simulation-based methods and metaheuristic optimization algorithms on building design models, focussing on daylight availability maximization and energy consumption minimization. The simulation-based method was presented using Rhino/Grasshopper software supported by the Ladybug, Honeybee, and Octopus optimization plugins; while MOPSO was chosen to calculate the metaheuristic optimization algorithm. The result indicated that OTTV values of the optimum design were respectively in the range of 24.06 W/m2 to 34.15 W/m2 for Octopus optimization and 25.19 W/m2 to 34.99 W/m2 for MPSO; and the WWR value for Octopus optimization and MOPSO were in the range 15% to 23% and 15% to 26%, respectively. While both methods showed similar results, the time duration for simulating in Rhino/Grasshopper was much longer compared to calculating the algorithm using MATLAB, indicating that simulation-based was less effective.
The uniformity concept of urban design: impact of cultural traditions on the meaning of Balinese town
Authors: Mahira E D , Soemardiono B , Santoso E B
Published: November 2021

This study considers the conceptions of religion, tradition, and culture in the urban design process, to produce designs that become the identity of cities in Bali. A socio-semiotic approach is used to explore popular accounts of the conceptions of tradition operating in urban spatial arrangements from historical to contemporary periods. The case study in Gianyar City explores the meaning of urban space based on local wisdom that is still believed by Balinese people. Such exploration provides a basis for reconnecting urban designs with their cultural contexts, thereby promoting spatially expressed localism. Especially for Gianyar City, respect for religious systems, beliefs, and religions that have developed and are highly trusted by the public is expressed in symbolic elements that are embodied in the composition of space, and in fact, give rise to the concept of uniformity. This condition resulted in not achieving a more prominent urban cultural identity and being further damaged by the highly standardized process in the Indonesian planning system. However, the principles of religion and culture that are still alive make Balinese architecture alive, despite changing values, whether we realize it or not.
Reinterpreting local wisdom of Rumah Kaki Seribu as sustainable architecture
Authors: Prabaswara B C , Hariyanto L , Arifin L S
Published: November 2021

Awareness of the increasing global issues regarding global warming and climate change has encouraged building designers to look back on knowledge of traditional architecture as energy-efficient and sustainable solutions. This study focuses on the traditional architecture of Rumah Kaki Seribu as sustainable architecture. Rumah Kaki Seribu is a traditional architecture located in the Arfak Mountains, West Papua, inhabited by the Arfak Tribe. Each architectural element of Rumah Kaki Seribu has a different sustainability value. The sustainability value of Rumah Kaki Seribu discussed is the concentration on the fireplace element and the roof element. The fireplace and roof elements were analyzed using the eco-cultural concept of the six competing logics of sustainable architecture by Simon Guy and Graham Farmer. Eco-cultural logic is a logic that is closely related to traditional architecture. The characteristics of sustainable buildings that use eco-cultural logic can be determined by looking at several parameters, namely the image of space, the source of environmental knowledge, the building image, technologies, and the idealized concept of place. The study aims to learn traditional architecture as a design approach to understand and respect the environmental context for solutions to global issues that occur.
Actual and expected transactional and transformational leadership behaviors of project managers
Authors: Andi A , Sugianto K , Khoesasih A F
Published: November 2021

In order to ensure that construction team works toward the desired objective, it is important for a project manager to behave as an effective project team leader. This paper aims to investigate actual and expected leadership of project managers by comparing the transactional and transformational leadership behavior model. To accomplish the objective, the paper first briefly reviews the ways in which leadership, especially the two models, are approached. Data were collected through a survey to 63 construction team members in several ongoing projects in Indonesia. The results indicate that the project managers frequently use both transactional and transformational behaviors in leading their team, except the laissez-faire style. Results from analytical hierarchy process analyses interestingly show that the project team members expect the project managers to exhibit transformational leadership more than transactional leadership.
A preliminary survey on the understanding and application of digital and emphatic engagement of the construction constituents in Surabaya
Authors: Nugraha P , Jonathan M , Listio A
Published: November 2021

This survey was actually triggered by this seminar topic, and applied to construction constituents in Surabaya. The Digital aspects derived from literature reviews are: Building Information Modelling, Augmented Reality, Mobile Technology, Sensors, Drones, Photogrammetry, Artificial Intelligence, Robotics, 3D Printing & Big Data analysis. The Emphatic Engagement aspects are in Integrated Project Delivery system and in serving the client’s needs. Survey questions were focused on the understanding on the digital aspects, and where they got the information from. Further questions on the application of both Digital and Empathic Engagement aspects. The best understanding on Digital Aspects are about Mobile Technology and Drones. Least understanding about augmented reality, robotics and smart sensors. Best application of Digital aspects is in CAD, which unfortunately is not fully a BIM technology. Least applications are on Robotics and 3D printing. Best application of Emphatic Engagement is “having same vision/mission”, while the least applications are on “BIM faster work” and “BIM conflict resolving”.
Changes in drivers’ viewing frequency, maneuver duration, and degree of difficulty during back-in parking maneuver with different conditions of parking spaces
Authors: Setiawan R , Dammara A S , Cahyadi B , Widarno B , Njoko F H , Noviani M
Published: November 2021

To some people, back-in parking maneuver is a relatively hard thing to do. However, previous studies have proven that back-in parking is safer than head-in parking because when exiting the parking space (back-out) from head-in parking, the driver's field of view is more limited, thus increasing the chance of an accident. This study aims to determine the changes in the driver's viewing frequency on the rear-view mirror, maneuver duration, and degree of difficulty during back-in parking maneuvers. Data collection was obtained from 45 participants who tried to park their cars in a parking space with an angle of 30°, 45°, 60°, 90°, each with four different conditions of parking spaces. The driver’s viewing frequency on each rear-view mirror (left, right and center) and maneuver duration were obtained from a dashcam and an external camera recording. The difficulty level for maneuvering was filed according to the driver’s opinion during the experiment for each parking space condition. Based on the data analysis, it was proven that the existence of cars parked on either side of that parking space (obstacles), parking space line signs, and both simultaneously increase the driver’s viewing frequency and maneuver duration when doing back-in parking maneuver, but at the same time, ease the parking maneuver, according to the driver.
Potential damage to residential building due to adjacent surcharge fill loading-case studies in Surabaya, Indonesia
Authors: Tjandra D , Sugiharto H , Buntoro J , Wulandari P S
Published: November 2021

Housing construction is a common construction activity and is always needed from time to time. House construction can be in the form of building new house or renovating an existing building. The impact of construction work to adjacent building or structure is something that cannot be avoided but must be minimized. The case study in this research aims to increase the awareness of all parties in construction project related to the potential damage to the surrounding buildings that may occur. This research was conducted with a case study on the construction of residential houses in Case A and Case B located in Surabaya-Indonesia. Field observations, analysis of damage causes, rectification methods and estimated cost were carried out in this study. These two case studies presented the damages analysis on residential house due to settlement which caused by adjacent surcharge fill loading. This settlement causes a differential settlement on both sides of the existing building, which had impacts on floor slope and cracks in wall. Proposed rectification works were made to restore the house to reach minimum serviceability requirement and prevent further damage in the future. The cost of repairing and retrofitting the damage existing house significantly increases the budget for a new house construction project. Therefore, careful planning in construction project considering the impact of soil settlement is needed more attention, especially in a dense urban area. Good communication and coordination between contractors and owners of neighbouring building are also needed to minimize the potential conflicts during or after construction works.
Limits for scattering resonances in azimuthally inhomogeneous nanotubes
Authors: Valagiannopoulos Constantinos , Sihvola Ari
Published: November 2021

Resonant electromagnetic scattering has been optimized for angularly inhomogeneous nanotubes characterized by different surface admittances along the two complementary arcs. The optimal designs are substantially more efficient compared to their best homogeneous counterparts and the spatial distribution of the scattering power reveals the nature of the sustained resonances. In this sense, the reported scattering scores constitute limits for the response of that simple class of structures and can be employed as optimized components in a wide spectrum of photonic devices from wave transformers and field sensors to electromagnetic filters and optical lenses.
‘Truth in Fiction’ Reprised
Authors: García-Carpintero Manuel
Published: November 2021

The paper surveys recent appraisals of David Lewis’s seminal paper on truth in fiction. It examines variations on standard criticisms of Lewis’s account, aiming to show that, if developed as Lewis suggests in his 1983 Postscript A, his proposals on the topic are—as Hanley puts it—‘as good as it gets’. Thus elaborated, Lewis’s account can resist the objections, and it offers a better picture of fictional discourse than recent resurrections of other classic works of the 1970s by Kripke, van Inwagen and Searle. The turn that Lewis suggests and the paper recommends draws on the remaining outstanding contribution from that time: Walton’s.
Prediction Models for the 5- and 10-Year Incidence of Home Morning Hypertension: The Ohasama Study
Authors: Satoh Michihiro , Metoki Hirohito , Asayama Kei , Kikuya Masahiro , Murakami Takahisa , Tatsumi Yukako , Hara Azusa , Tsubota-Utsugi Megumi , Hirose Takuo , Inoue Ryusuke , Nomura Kyoko , Hozawa Atsushi , Imai Yutaka , Ohkubo Takayoshi
Published: November 2021

Background

We aimed to develop risk prediction models for new-onset home morning hypertension.

Methods

We followed up 978 participants without home hypertension in the general population of Ohasama, Japan (men: 30.1%, age: 53.3 years). The participants were divided into derivation (n = 489) and validation (n = 489) cohorts by their residential area. The C-statistics and calibration plots were assessed after the 5- or 10-year follow-up.

Results

In the derivation cohort, sex, age, body mass index, smoking, office systolic blood pressure (SBP), and home SBP at baseline were selected as significant risk factors for new-onset home hypertension (≥135/85 mm Hg or the initiation of antihypertensive treatment) using the Cox model. In the validation cohort, Harrell’s C-statistic for the 5-/10-year home hypertension was 0.7637 (0.7195–0.8100)/0.7308 (0.6932–0.7677), when we used the full model, which included the significant risk factors in the derivation cohort. The calibration test revealed good concordance between the observed and predicted 5-/10-year home hypertension probabilities (P ≥ 0.19); the regression slope of the observed probability on the predicted probability was 1.10/1.02, and the intercept was −0.04/0.06, respectively. A model without home SBP was also developed; for the 10-year home hypertension risk, the calibration test revealed a good concordance (P = 0.19) but Harrell’s C-statistic was 0.6689 (0.6266–0.7067).

Conclusions

The full model revealed good ability to predict the 5- and 10-year home morning hypertension risk. Although the model without home SBP is acceptable, the low C-statistic implies that home BP should be measured to predict home morning hypertension precisely.
MAGUS+eHMMs: improved multiple sequence alignment accuracy for fragmentary sequences
Authors: Shen Chengze , Zaharias Paul , Warnow Tandy
Published: November 2021

Multiple sequence alignment is an initial step in many bioinformatics pipelines, including phylogeny estimation, protein structure prediction and taxonomic identification of reads produced in amplicon or metagenomic datasets, etc. Yet, alignment estimation is challenging on datasets that exhibit substantial sequence length heterogeneity, and especially when the datasets have fragmentary sequences as a result of including reads or contigs generated by next-generation sequencing technologies. Here, we examine techniques that have been developed to improve alignment estimation when datasets contain substantial numbers of fragmentary sequences. We find that MAGUS, a recently developed MSA method, is fairly robust to fragmentary sequences under many conditions, and that using a two-stage approach where MAGUS is used to align selected ‘backbone sequences’ and the remaining sequences are added into the alignment using ensembles of Hidden Markov Models further improves alignment accuracy. The combination of MAGUS with the ensemble of eHMMs (i.e. MAGUS+eHMMs) clearly improves on UPP, the previous leading method for aligning datasets with high levels of fragmentation.

Availability and implementation

UPP is available on https://github.com/smirarab/sepp, and MAGUS is available on https://github.com/vlasmirnov/MAGUS. MAGUS+eHMMs can be performed by running MAGUS to obtain the backbone alignment, and then using the backbone alignment as an input to UPP.

Supplementary information

Supplementary data are available at Bioinformatics online.