bluuebunny/crossref_metadata_2025 huggingface dataset:
Sarinah: Icon of the Indonesian society of the past, in the context of Braga Revitalization
Authors: Rachmayanti I , Rombe O S C , Meliana S
Published: August 2021

Braga Street is famous for its identity as an exclusive fashion and commercial center. Unfortunately, the region’s popularity faded with the start of the war and Japan’s struggle for power. Thus, their owners abandoned many buildings and no longer functioned, which made the area neglected and not maintained. The city government’s efforts in revitalizing heritage areas in the city have been going on for the past two decades, one of which is the Sarinah shopping center located in the Braga area. The building is now turning into a mixed-use commercial complex with the existence of shopping centers and hotels with a change in function has become a significant effort on revitalizing the Braga area. Sarinah is a humble name with a powerful icon that represents the Indonesian society of the past. This paper aims to review new lifestyle adaptations to the interior design of the revitalization of Gedung Sarinah Braga. It uses a descriptive method of Qualitative methodology by doing the Perceptual Mapping, survey, and document analysis. The result shows that the interior space revitalization does not represent the name of Sarinah.
A study of the application of behavioral architecture in public libraries in Jakarta, Indonesia
Authors: Mawardah S , Nurdiani N , Katarina W
Published: August 2021

This paper presents the study of the applications of behavioral architecture that related to physical quality of public library in Jakarta, Indonesia. The research is based on the reason why there are still many people who rarely visit the library. The fact that there are many people are interested in visiting the library is inversely proportional to its implementation, where they say it is rare to visit the library. This is based on several factors related to the design of the library. The question is what does the community want about a library that can interest them? Then this research focuses on finding out what the criteria of the library that the general public does not only attract but also encourage them to come by study using descriptive qualitative with questionnaires and observation methods. The results of the study are the placement and arrangement of the layout in the library room, especially in the main library room include the reading area should be follows the behavior and preferences of publics and library users. Respondents prioritize comfort in the library space with an emphasis on the reading area as much as possible with more relaxed criteria, focused criteria, and general criteria.
The application of accessibility in public library building design in Jakarta, Indonesia
Authors: Bonk A E , Nurdiani N , Katarina W
Published: August 2021

While the number of people with disabilities increasing every year, there is very little awareness of the importance of access for disabilities, one of the examples is the accessibility in the library. This paper presents the study of the disability-friendly facilities that is provided by the National Library of Indonesia. The study is aimed to investigate whether the facilities provided by the libraries has already meets the standards by both international and national regulations. The research which has been done in National Library of Indonesia resulted that overall, the accessibility provided by the library is considered appropriate by both of the standard of International Federation of Library Association and Institutions and by the Ministerial Regulation. And the facilities which needed to be improved are stair, toilet, furniture, and information sign.
The study of green roof application in apartments in Indonesia
Authors: Latif C A , Nurdiani N , Katarina W
Published: August 2021

This research was done to study the application of a Green Roof in apartment buildings in Indonesia. The objective of the study is to understand what aspects are needed from the application of the Green roof to apartments. The method used is descriptive method, in which the author focuses more on finding and processing data and information about the design and application of green roofs in apartments in Indonesia, both direct secondary and primary data through other intermediaries. The results of the study show that the application of green roofs to apartments has several aspects, namely aspects of application and types of plants.
A study of coworking space and its facilities in Jakarta, Indonesia
Authors: Nurdiani N , Katarina W , Putra R A
Published: August 2021

Many startups in Jakarta that require coworking space for their companies can be expend. Coworking space is a shared office that is used by many types of professionals. This study aims to analyze the types of spatial layouts in the coworking space in South Jakarta. Data analysis was done by using study literature and study comparative with the same coworking space. The results of the study are the concept of planning and designing a coworking space in South Jakarta.
A study on sea condition of Seribu Islands, Jakarta and the potential of floating PV Systems.
Authors: Hendarti R
Published: August 2021

This paper presents an initial study on the potential of the utilization of floating PV system for Seribu Island sea waters. Seribu Islands is an area consisting of many islands and there are many coral reefs and algae. From several existing studies, the condition of coral reefs and the algae, particularly the Zooxanthellae are quite alarming. This is not only because of human actions, but also because of the water’s condition such as water temperature, salinity and pH. Additionally, the incoming light is also influence the growth of the algae. This paper, therfore, focus on study the sea condition particularly the condition of the corall reefs and the zooxanthallae and an initial plan of the floating PV system application.
A Sustainable Value of Vernacular Architecture and Coffee Culture for Coffee Value Chain with Case Study Toraja
Authors: Caroline Rombe Octaviana Sylvia , Ching Goh Hong , Ali Zuraini Md.
Published: August 2021

Tongkonan, a Toraja vernacular architecture, reflects the tangible and intangible value of the social, economic, and political lives. Furthermore, the coffee culture, together with the Tongkonan, is part of the cultural landscape. For most Toraja people, coffee considers a primary income, but the current coffee value chain is operated in a long linear path. It has not been taken care of in a sustainable way, and the essential thing the coffee value chain has not adopted the local wisdom point of view on creating the roots and the link. Based on the coffee value chain’s urgency to be sustainable growth, this research aims to formulate a framework of a community-based sustainable coffee value chain by analyzing the intangible value of vernacular architecture and coffee culture. This research is conducting using qualitative research methodology. It employs a case study approach as a method of collecting and analyzing data. The finding shows that Toraja vernacular architecture’s intangible value is the root of the Toraja coffee culture. It will be the base of the societal structure and culture concept to fill the coffee value chain’s circular economy gap.
The Residential Soundscape Preferences in Indonesia: The Real and The Expectation
Authors: Sakina B , Djimantoro M I
Published: August 2021

The soundscape approach is one of the acoustic assessment tools which has an important role in shaping sustainable and healthy cities. The quality of the acoustic environments needed to be considered because when such quality is poor, it will affect the quality of life and well-being of a human. In a residential environment, people have their expectations of soundscape preferences in order to achieve a good quality of the acoustic environment. But the existing condition often is contradictive with the expectations. This study aims to compare the in-situ and expected soundscape conditions of urban residential and gated-residential in Indonesia. The perceived affective quality and sound sources aspects will be analysed in order to achieve this purpose. The research method used a mix of the quantitative and qualitative method through an online questionnaire to identify the sound sources that perceived by respondents who lived in urban and gated-residentials in several cities in Indonesia. The result of this study shown both urban residential and gated residential in Indonesia have the same soundscape conditions. People still perceived the in-situ soundscape condition differently than their expectations, where their existing soundscape conditions haven’t met with their soundscape preferences. The results of this study can be references for government or private sectors in designing residential areas with good quality of soundscape in order to achieve sustainable communities and cities.
A study of natural ventilation optimization in apartment living room in Pademangan, North Jakarta
Authors: Wizaka W , Adilah H , Prawata AG
Published: August 2021

Pademangan Barat is one of the most populous sub-districts in Pademangan with a density of 26,127 people/km2. The demand for good housing is high and the slump area is growth everywhere in this area. Vertical housing as low consume energy building are the best solution for bad social settlement today. Therefore, this studiesaimed to find out whether vertical housing with natural ventilation can be built in this area. Through analyse of its local climate, spatial planning, and simulations of building orientation, size and position of windows, it is expected to find which orientation is the best for best wind flows annually, the best windows position, type and size, and the best unit plan. This research conduct with computer simulation using x-flows.
The study of integration public space of apartment in South Jakarta that forms the basis of apartment design
Authors: Tedja M , Farhana NA , Noegroho N
Published: August 2021

This research shows a study related to aspects - aspects that become the foundation in designing an apartment in the city center. This research is based on the background, that the population of DKI Jakarta population continues to increase and over time the demand for land is increasing. Vertical housing in the city center is a solution to this problem, but many apartments in the city center do not have public space that can accommodate the activities of residents and the surrounding environment. Departing from this, public needs apartments that have public space that can support the needs of residents and the surrounding environment. Based on this, the initial stage of this research was conducted with a competitor study in which data and information will be used as a runway in designing apartments that have public space that can support the needs of residents and the surrounding environment. The study was conducted by interviewing the apartment manager and the data and information obtained were processed using a qualitative approach related to the method of descriptive interviews and quantitative related figures used as benchmarks to get the appropriate area.
Application Ecology Architecture in the Housing with land
Authors: Ardiani Yanita Mila
Published: August 2021

In this Covid 19 Pandemi, many people tend to have more activities inside their home. They create something creative or planting green in their homes with their families. Not every home in the city from Suburban and urban areas has much ground or land to be planted green. The one which has land can have many options whether the plant will be located. Some of the plants can grow with or without so many suns. In this paper, try to data and diagram any way to plant green in the middle-class housing with land in Jakarta and the periphery city Tangerang. The method is by Observing and interview qualitative data then conclude. This paper’s result can make primary data for Real estate developers to design the housing with the planting approach. And all of these can make a good community make greener the atmosphere of Ecology Architecture.
Study of accessibility in Kampung Melayu Terminal east Jakarta
Authors: Prahaditya FI , Prawata AG , Wizaka W
Published: August 2021

This paper describes how accessibility problem in the Kampung Melayu Terminal. problems in the form of lack of security and convenience for users of public transportation. Using a walkability approach that refers to the safe and security component and cones again to the crossing safety variable. Crossing safety problems are mostly encountered at several points on the site. The solution to this problem is to use a non-level crossing facility in the form of a Public Crossing Bridge (JPO) and underpass. Users and vehicles have separate zones / each has their zoning. Because, by having good circulation and mobilization, minimizing the movement of accidents between users and vehicles, JPO and underpass can streamline the area by being able to support other needs such as the provision of purchase tickets, waiting areas and others. Traffic, Users are protected from hot and rainy weather and Integrates indirect public transportation.
Solar radiation on photovoltaics panel arranging angles and orientation
Authors: Viviani Navisra , Wijaksono Sigit , Mariana Yosica
Published: August 2021

For a comply the needs of electrical energy in office buildings, there needs to reduce from fossil energy to renewable energy. Photovoltaic panels are devices that convert sunlight and solar radiation into electricity. For the application, this device it is necessary to study so that the panel can work effectively. The aspects that influence the use, there are the geographical location, the slope of the panel, the orientation of the building, and the shading of surrounding objects. This study examines these aspects to get a mass configuration that can adapt from the application of photovoltaic panels. By using Simulation from the Formit application, this study obtained a mass configuration that can reduce 18% of the electrical energy for office building approach in South Jakarta
Early Children’s Education Center with Play Space Concept in East Jakarta
Authors: Molenaar B C , Sjarifudin F U , Suharjanto G
Published: August 2021

The purpose of the research is to review the conduct of planning a Center Early Childhood Education with play space concept that creates environmental activities for children for review learning with play and supporting children’s activity and characteristics. Early Children have a sense of curiosity and surrounding environment to know and explore. Playing is an effective way for kids and learning can be supporting the motion activity to increase kids and insights for kids to get to know their environment. The research was conducted with comparative studies, literature studies, and analysis. The results of the method were then applied as a concept play space Development Environment strategy in Early Childhood Education. (BCM)
Suistainable Development Planning of Tourist Village Using Participatory Mapping (Case study: Sanankerto Village, Malang, Indonesia)
Authors: Maulana F I , Pratama F C
Published: August 2021

Improving village welfare is a noble goal to be achieved together. According to Law No. 6 of 2014 concerning Villages, given an opportunity is given to Villages to develop Villages according to the potential offered by prioritizing community participation. The establishment of Village Owned Business (Bumdes) is one form of village economic development and strengthening. Sanankerto Village, Turen, Malang is a Tourism Village also known as the Boon Pring Ecotourism Village. Boon Pring is a superior Bumdes to attract tourists. An area of 36.8 ha of bamboo and in more than 60 types of bamboo is an attraction. In the middle of the bamboo forest there is also a natural spring that irrigates rice fields with an area of approximately 124 ha. Researchers conducted preliminary research in the Tourism Awareness Group (Pokdarwis) Sanankerto Village and obtained information about the management of Sanankerto Tourism Villange is not good. The development of Sanankerto Tourism Village has been slower and less able, ranging from planning, implementation, to control and evaluation of the tourism village development strategy. Only relying on Boon Pring as Bumdes makes Sanankerto Tourism Village less than optimal to be able to become the preferred tourist destination village. The research entitled “Mapping of Villages Potential as a Strategic Step in the Development of Sanankerto Tourism Village, Turen, Malang” aims to examine the following matters: (1) Revealing and understanding the Sanankerto Tourism Village management model so that strengths, weaknesses, opportunities and threats can be identified which will then be used as a basis for developing a tourism village development strategy. (2) To uncover and understand appropriate alternative strategies in developing Sanankerto Tourism Village based on the mapping of village potentials. The researcher used a descriptive qualitative approach to describe the management of Sanankerto Tourism Village. Swot analysis is then performed and followed by AHP analysis with the results of alternative strategies in building and developing Sanankerto Tourism Village.
Beach Profile Assessment and Erosion Rate Estimation of Monsoonal Coastline Area in Pahang, Malaysia
Authors: Adnan Nor Aizam , Rahim Haris Abdul , Mohd Fazly Amri , Maulud Khairul Nizam Abdul
Published: August 2021

Malaysia has a long coastline stretching over 4,809 km where more than 1,300 km of beaches are experiencing erosion. Coastal erosion is defined as the permanent loss of land and habitats along the coastline resulting in changes to the coast. Thus, it is important to detect and monitor coastline changes especially in Pahang, Malaysia. This study used temporal data and high spatial resolution imagery of SPOT 5. It also explored remote sensing and GIS techniques to monitor coastline changes along 10 identified locations, from Cherating to Pekan of the Pahang coast. Ten significant coastline locations namely Pantai Cherating, Pantai Air Balok, Sungai Ular, Pantai Batu Hitam, Pantai Beserah, Swiss Garden Kuantan, Taman Gelora, Pantai Sepat, Pantai Cherok Palok, and Pantai Tanjung Agas were identified to be vulnerable to coastline erosion. Two temporal remote sensed date of SPOT 5 for the year of 2006 and 2014 were used to quantify erosion or accretion rate using National Coastal Erosion Study (NCES) guidelines. The research found that eight area out of 196 or 39.7% locations were eroded and categorized into acceptable erosion category (K3), while 64 area or 32.7 % had significant erosion category (K2) where the coastline retreated more than one meter per year and the most critical eroded area was K1 at 54 or 27.6% sites. Cherating, Swiss Garden Resort, and Cherok Paloh were among the sites with the highest erosion rate between −5.692 and −6.919 m/yr. Meanwhile, the highest rate of accretion or sedimentation was indicated in Tanjung Agas at 7.391 m/yr. A qualitative relationship between the erosion rate and slope percentage for the entire Kuantan coast that stretch from Pantai Cherating to Tanjung Agas, Pekan indicated that the coastal slope percentage, the beach width, and the beach material that deposited on the sites were interrelated and had significant impacts on the erosion rate on several particular zones of the Kuantan coastlines. The findings from monitoring coastline changes and identifying vulnerable erosion areas might be useful in the policy and decision making for sustainable coastal management.
A laboratory study on wave transmission over hexagonal artificial reef
Authors: Armono Haryo Dwito , Winarto Aris , Sujantoko  , Ketut Suastika I
Published: August 2021

Artificial reefs are commonly used to rehabilitate natural coral reef damage. Artificial reef serves as a new habitat for marine life and simultaneously protect the shoreline by reducing wave energy without reducing the aesthetics of the protected beach. As an artificial reef can serve as submerged breakwaters, the level of their effectiveness in reducing incoming wave need to be investigated. The new form hexagonal shape artificial reef is proposed then evaluated based on the transmission coefficient. The tests for various configurations of a hexagonal reef in a 1:10 scale were conducted in the wave flume of Department Ocean Engineering, Institut Teknologi Sepuluh Nopember, Surabaya. The result of tests was presented and showed that the new proposed hexagonal shape artificial reefs have better performance compared to cylindrical and cubical shape artificial reefs.
Community Resilience and Empowerment Through Urban Farming Initiative as Emergency Response
Authors: Atmaja T , Kusyati N , Fukushi K
Published: August 2021

Currently, urban vulnerability has been exposed by catastrophic and unpredictable events which required cities to improve their resilience. Urban farming is promoted as one of the alternative strategies that could improve resilience through community empowerment aligned with re-naturing the environment. This study highlights the role of urban farming as community empowerment activities which could develop community resilience in the context of food and nutrition security specifically as emergency response. The study utilized an in-depth field survey to develop the database. The study found that urban farming could contribute to community resilience for feeding potential and nutrient sufficiency especially for targeted population who has highest risk during emergency such as the COVID-19 case. Urban farming in Malang could feed up to 50,000 inhabitants which cover only an age range of 60-64 years old. To provide sufficient vegetables for targeted population, there was a need for 1.91% (211 ha), 1.09% (120 ha), and 0.82% (91 ha) of area given each production scenarios such as normal, medium, and intensive management, respectively. The most important nutrient needs were Vitamin B1, B2, B12, D; Niacin eq.; and Folic acid due to only 10% sufficiency in the average. The study recommended specific additional vegetables to be cultivated such as red spinach and long beans since they have the highest nutrients content based on scoring.
Ionosphere Anomaly Analysis before Earthquake Using GPS (Case Study: Banten Earthquake August 2nd, 2019)
Authors: Liufeto D A , Cahyadi M N , Rahayu R W
Published: August 2021

This research is to analyze anomalies in the ionosphere that occur when an earthquake occurs. When an earthquake occurs, three types of waves are generated, namely: acoustic waves, gravity waves, and reyleigh waves. Acoustic waves generated perpendicularly from the earth’s crust during an earthquake propagate into the ionosphere, where they create electron density deviations. This phenomenon is detected as CIDs (Coseismic Ionosphere Disturbances), namely TEC (Total Electron Content) fluctuations that occur 15 minutes to 1 hour after an earthquake occurs. As a result of this deviation, the electromagnetic waves emitted by the GNSS (Global Navigation Satellite System) satellite will delay when passing through an ionosphere of approximately 300 km from the earth’s surface. The earthquake data used in this study came from earthquakes in Indonesia with the potential for a tsunami, namely the Banten earthquake on August 2, 2019 (7.4Mw from BMKG) with GNSS data from the closest CORS station to the epicenter, namely the CPTN, CPTU, and CUJG stations. The processing results show that there is a TEC anomaly recorded by GPS satellite no. 29 which appears 15-20 minutes after the earthquake. Anomalies ionosphere that occurs during an earthquake are expected to be useful as an early warning system before a tsunami happened.
Interaction between Marine Sectors using System Dynamics for Patimban Deep Sea Port as a Green Port: A Proposed Model
Authors: Suheri Tatang , Alexandri Mohammad Benny , Raharja Sam’un Jaja , Purnomo Margo , Viridi Sparisoma
Published: August 2021

Based on Marine Policy Statement (MPS) some sectors are chosen as the key elements, whose interactions are modeled using system dynamics (SD). They are port, commercial shipping, marine protected area, and commercial fishing. Besides those, according to MPS and beyond the coastal area conversion of agricultural land into the industrial area due to commercial shipping, maintenance of state roads due to port (shifting from Tanjung Priok port), redistribution of population, and environmental aspects will also be taken into account in the model. Some of the elements will construct reinforcing (R+) loops, while the others construct balancing (B-) loops in finding an equilibrium or solution. Several scenarios are proposed, where each has a different set of parameters, that can reflect a certain policy. Due to the lack of certain data and information related to the deep seaport, most of the data used in this work are based on assumptions but with a logical causal relationship between elements. It is observed that some features in the results are as expected, but some are new and depend on the chosen scenario. Further benchmarks with real situations are required for validation of the model.
Beach Topographic Change Analysis Using Multi-temporal UAV Data
Authors: Chang K T , Fang H M , Hsiao S S , Li C S
Published: August 2021

A time-serial topographic change was performed using two kinds of surveying methods, including direct measurement and indirect remote sensing technology for beach topography surveillance. Compared with reference topographic data, the root mean square error was 0.169 m. From May, 2018 to March, 2019, multi-temporal beach topographic change results indicated that the distance between baseline and shoreline varied in the range of −24.82∼9.58 meter, and weekly variates are −3.16∼0.45 m. The UAV technique can be efficiently used to detect topographic change information in the coastal area.
Semi-probabilistic Method in Analysing Kendeng Fault Earthquake Hazard in Surabaya, East Java
Authors: Widodo Amien , Syaiffudin Firman , Perdana Aliffiansyah , Adausy Thufeil Amr , Kristanto Aisya Nur Hafiyya
Published: August 2021

Surabaya is one of the cities in Indonesia which is prone to earthquakes. This condition is caused by the megathrust zone located in southern Java. In addition, there is an active fault that passes through East Java, namely the Kendeng fault, which to be the source of underground earthquakes. The part of Kendeng Fault that is situated near Surabaya is classified as the Surabaya segment and Waru segment. Based on this condition, research was carried out to analyze the earthquake hazard caused by Kendeng Fault in Surabaya city. A semi-probabilistic method is used in this research, as it can calculate the Peak Ground Acceleration (PGA) and earthquake intensity by considering the range from the measurement point to every point on the fault. The PGA measurement is using the equation of attenuation function. USGS Vs30 data, East Java Province base map, and Surabaya geological map are the data that were used to support the research. The result of earthquake hazard analysis gives the highest ground acceleration potential region is located in the north-western Surabaya subdistricts, this includes Sambikerep and Lakarsantri subdistricts. The high value of PGA and earthquake intensity is strongly affected by the short distance to the earthquake source.
Microplastic Distribution in Seawater and Sediment on Kampung Atas Air, Balikpapan
Authors: Prasaningtyas Asri , Wulandari Marita , Ghozali Achmad
Published: August 2021

Kampung Atas Air at Margasari Village, West Balikpapan Sub-District on Balikpapan City is a densely populated settlement where most of the houses are located on the tidal land of the sea. That location is an area that has a high potential for microplastic pollution due to existing settlement activities. Microplastic is plastic particles that smaller than 5 mm in size sourced from large or macro-sized industrial, household, and plastic weathering activities. Microplastic samples were taken from two media, water and sediment. Microplastic identification was carried out under a microscope with 10 times magnification. The result of this observation shown 4 types of microplastic, which are films, fragments, fibers, and granules. Fiber is the most common type found in this observation. It came from community activities such as fishing and washing clothes.
Optimum Installation Inclination of Solar Vacuum Tubular Collector in Lhasa
Authors: Hang Zou , Xin Liu , Enshen Long , Zhanqiang Liu
Published: August 2021

It is important to accurately design the installation inclination of solar collector for improving the utilization rate. This paper selected Lhasa area as a typical city which was rich in solar energy, setting a mathematical model for energy collection of vacuum tube collector to dynamically analyse the south towards, 0°∼90° angle of solar radiation on the surface of the collection on 8760 hours. As the results showed: the ability of the vacuum tube collector to collect solar reflection, scattering and direct radiation varied with the installation inclination a lot. When the inclination angle was 90, the maximum annual reflection radiation value was collected by the vacuum tube collector; when the inclination angle was 0, the maximum annual scattering radiation value was collected; when the inclination angle was local latitude, the maximum annual direct radiation value was collected; direct radiation in Lhasa was the main factor, so the maximum installation inclination of solar energy collected during the whole year and heating season was close to the local latitude.
Research and development of ship ballast water treatment system
Authors: Wen-xiang CHEN , Fa-xin ZHU , Xian-bin TENG , He-wu Yang , Kong-xing DING , Zhao-jian WANG
Published: August 2021

If the ballast water is discharged without treatment, it will cause serious ecological damage to the local port. This paper takes the ship ballast water treatment system as the research object. The existing ballast water treatment system is investigated. A ship ballast water treatment system with capacity of 150m3 /h, filtration accuracy of 40um and UV dose of 350mJ/cm2 is designed. This paper introduces the working principle of the main unit of ship ballast water treatment system, and designs an automatic monitoring system based on PLC and LabVIEW. The results show that the device has high practicability and feasibility.
Analysis on Finite Element Grid Size and Discrete Error for Super-high Arch Dams
Authors: Yan Yizhi , Zhang Wanju , Shen Zhimin , Li Zimeng , Wei Yunpeng , Wang Wenxiong
Published: August 2021

Compared with the world super-high arch dams with height more than 200 meters, the six super-high arch dams already built or under construction in China share the same special body shapes with higher ratios for both top/bottom width and thickness, and for top arch length with dam height. Also all of them are subjected to big top-level water pressures. In the paper, the computational formulation of thermal-coupled structure of hollow sphere similar to arch dam in shape and load-subjected is derived first and analysis of errors from the finite element method compared with the analytic solution is made. Then, a typical super-high arch dam is taken as the example of structure analysis including dam body mesh division, stress distribution, error estimation. Employing quadrilateral Coupled-field tetrahedral element with size decided by the bottom thickness multiple of arch crown beam, performance of mesh division and analysis for complex model is done conveniently and fast. Also, the paper investigates the error and convergence of results with different mesh density, discusses the special stress states of arch dam, and proposals acceptable dam body element size from calculation accuracy, convenient operation and elapsed time when performance is carried on with strong coupling on conmen personal computers. The research work indicates that errors of analysis results in most part of area are very small excepting those for the local singularity and concentration part when the dam body element size is decreased to 0.25 multiple of bottom thickness of arch crown beam, with dam body energy error norm less than 10% and consuming a couple of elapsed time. The conclusion should be common for the arch dams in China as they have similar shape.
State-of-the-art of Research Progress of Self-centering Structure System
Authors: Zhang Qian , Xiong Ergang , Guo Ruie
Published: August 2021

Traditional building structures dissipate seismic energy through the plastic deformation of members in the earthquake, which may lead to a large residual deformation after the earthquake. Those structures are very difficult to repair. Traditional building structure can become a new structure with self-centering ability by using a special energy dissipation component, adding prestressed tendons or supplementing dampers. Compared to the traditional building structure, this new self-centering structure can more effectively reduce the residual deformation caused by the earthquake, and it has a desirable capability to dissipate seismic energy so as to enable itself to be of more security. In this study, the domestic and foreign self-centering structures are classified and summarized. This study deals with research progress of self-centering structures including self-centering concrete shear wall structure, self-centering concrete frame structure, self-centering steel moment frame structure, self-centering braced steel frame structure, self-centering steel plate shear wall structure and self-centering offshore platform structure. Besides, this study introduces the related research progress of other research fellows.
Water saving situation in southern water rich areas in the new era and research on implementing national water saving action Taking Haining as an example
Authors: Chen Caiming , Sun Yi
Published: August 2021

Haining City is one of the top 100 counties in China’s county economy. In 2020, Haining City ranks 19th among the top 100 counties in China’s county economy, and is a strong economic County in Jiaxing City and even Zhejiang Province. The implementation of national water-saving action proposed in 2019 is not only the embodiment of the national will, but also the only way to solve the bottleneck of water resources and water security. It is of great significance to implement the national water saving action to improve the level of intensive utilization of water resources, to support the high-quality development of economy and society and to serve the construction of ecological civilization in Haining. At present, the water-saving work in Haining City is faced with a series of problems, such as the lack of water-saving awareness, the lack of water-saving work breadth and depth expansion. Based on the full analysis of the current water-saving situation in Haining City, the “1536” water-saving policy system and work system with Haining characteristics are put forward.
Influence of reclaimed water on water quality of urban rivers receiving WWTP effluent in Beijing
Authors: Zhao X , Zhang P , Wu W , Li K , Liu X , Lang H , Gan L
Published: August 2021

As a new type of water source, reclaimed water is used to replenish the landscape water bodies of urban river courses, which can alleviate the problem of insufficient water in river courses. However, due to the large amount of reclaimed water input, the water quality of the downstream river is obviously different from that of the upstream river. In this study, with the recharge of reclaimed water, the water conductivity increased gradually from upstream to downstream of the Wenyu River river, while the pH decreased gradually. In terms of nutrient concentration, TN, NO3-N and NO2-N of river water showed an obvious upward trend from upstream to downstream.
Research on Rainwater Runoff Pollution in Different Blocks in Xi’an
Authors: Jia Rubin , Li Jian , Wang Yong , Tang Di , Tian Lei , Sun Jingxin , Wang Min
Published: August 2021

By monitoring the changes of SS/COD/TP/TN in rainwater runoff in residential, industrial, commercial and traffic areas of Xi’an with the rainfall duration, the characteristics of rainwater runoff pollution in different areas of the city are explored. The results show that the concentration of pollutants in different regions from high to low is: traffic area>industrial area>residential area>commercial area. The concentration of pollutants in rainwater runoff in various regions reached a peak at the beginning of rainfall (within 30 minutes), and then gradually decreased and stabilized. The concentration of main pollutants in rainwater runoff in traffic areas is significantly higher than that in other areas. It can be seen that transportation may be the main factor affecting urban rainwater runoff pollution
Research on Water Environment Situation and Regulation Progress of Urban Lakes
Authors: pengfei Zhang , xiaoyu Cui , yunxia Gao , jing Mo , donghong Chen
Published: August 2021

Urban lake water environment management and water ecosystem restoration have always been research hotspots at home and abroad. However, there have always been different opinions on the water environment situation and water environment regulation of urban lakes at home and abroad. Based on the investigation of domestic and foreign water environment conditions, this study summarizes the research progress of different control measures of urban lakes and their respective advantages and disadvantages, and combines the research examples of domestic and foreign scholars to systematically analyze and organize the control of major urban lakes, with a view to provide a reference for the evaluation and restoration of urban lakes in the future.
Research on visibility detection model optimization based on dark channel prior and image entropy and visibility development trend prediction
Authors: Zhou Hao , Dai Mingyu , Shi Dapai , Meng Yuchi , Peng Boyang , Chen Tingxuan
Published: August 2021

In this paper, a visibility detection model based on the dark channel prior and image entropy is established to improve the lane line detection algorithm. Our algorithm does not need to preset the target, nor is it affected by the camera calibration parameters and position. It transforms the visibility calculation problem into the atmosphere transmittance calculation problem and refines the required results through the guided filter, achieving more accurate and stable visibility estimation results. In addition, based on the changing regularity of the visibility over time obtained by the detection model, a mathematical model is established to predict the change of heavy fog. We use ADF to test the visibility obtained in the visibility detection model and calculate the autocorrelation and partial autocorrelation functions. Finding the original sequence non-stationary, we perform the difference on the data, remove all insignificant factors and then incorporate the data into ARIMA model for fitting, finally getting the fitting and prediction results. The results are found similar to the actual situation, indicating that the results obtained by the visibility prediction model are robust and reliable.
Research on concrete temperature control measures in deep hole area of super high arch dam
Authors: Fu Yuchen , Tan Yaosheng , Liu Chunfeng , Pei Lei , Wang Yajun , Hu Yu , Song Liangfeng
Published: August 2021

The deep hole area is a key part of the dam during the construction period, and its temperature field and stress field changes are the focus of the current research on temperature control and crack prevention in the deep hole area. Based on the traditional three-stage and nine-stage temperature control standard, this paper uses three-dimensional finite element temperature stress simulation analysis to study the three major research ideas of shortening the medium-term cooling, shortening the second-stage cooling, and shortening the two at the same time. The concrete silo with a relatively lagging temperature control phase reaches the arching temperature at the same time. The simulation results show that the three temperature control measures can not only keep the stress in the area within a safe range, but also effectively shorten the construction period, providing new ideas for temperature control measures in the deep hole area of the arch dam.
Observational Study on the Impact of Large-Scale Photovoltaic Development on Soil Temperature
Authors: Wu Wei , Qin Yifan , Yue Shengjuan , Ren Lei
Published: August 2021

The two-year observation data of the three monitoring stations inside and outside Qinghai Gonghe Photovoltaic power plant from January 2019 to December 2020 was compared to analyze the characteristics of soil temperature changes inside and outside the photovoltaic power plant. The results showed that the photovoltaic power plant had the function of heat insulation and heat preservation, and had a greater impact on shallow soil. Specifically speaking, the photovoltaic power plant is the cold source in spring, summer and autumn, and the cooling effect on soil is the strongest in spring; the station offers insulation to the soil, and the impact of the station on soil temperature decreases as the distance from the center of the photovoltaic station increases.
Simulation analysis on temperature rise during arch dam construction period
Authors: Li Guo , Wang Yajun , Tan Yaosheng , Liu Chunfeng , Pei Lei , Song Liangfeng , Yu Hu
Published: August 2021

During the construction of a high arch dam, the concrete will have a certain temperature rise after being cooled by the external environment and the concrete’s own hydration. As a high arch dam concrete temperature control stage, the temperature change generated outside the control, the impact on the actual project needs to be analyzed in conjunction with the specific project. This article focuses on the temperature rise phenomenon of an arch dam under construction in China, and analyzes the impact of the temperature rise phenomenon during the current arch dam construction period on the arch dam through monitoring data research and finite element simulation. The results show:(1)The arch dam has obvious temperature rise during the temperature control stage, which mainly occurs when the temperature rises after the cooling temperature is lower than the target temperature of the stage and after the large flow of water is stopped in the temperature control stage, and there is a short-term rise The phenomenon of 3 °C;(2)According to the inversion results of the monitoring of the arch dam, there is a certain safety margin for the concrete stress level of the corresponding parts before and after the temperature rise phenomenon;(3)The temperature rise phenomenon can be controlled at the temperature. During the control period, the tensile stress level of the concrete is prevented from further increasing when the concrete strength is low.
Synthesis of Fe-based Nanoparticles by Tea Polyphenols and Their Removal of Hexavalent Chromium
Authors: Xinxing Xia , Wei Luo , Longtao Wang , Shimi Li
Published: August 2021

Tea polyphenols were used to synthesize Fe-based nanoparticles (TP-Fe NPs) and remove hexavalent chromium (Cr(VI)) in an aqueous solution. The results demonstrated that 0.92 was the optimal mass ratio of tea polyphenols and FeCl3, and the addition of polyvinyl alcohol (PVA) as a stabilizer significantly improved the stability of Fe nanoparticle suspension, which can be maintained stable for 60 h. Both scanning electron microscopy (SEM) and X-ray diffraction (XRD) results showed that the sizes of the synthesized Fe nanoparticles, namely, FeO, FeOOH, Fe2O3, and organic matter such as quinone range from 50 to 120 nm. TP-Fe NPs effectively remove Cr(VI) in an aqueous solution by reduction and adsorption, and the removal rate surpasses 99.5%. Because of its low cost and high reduction efficiency, TP-Fe NPs has broad application prospects for remediating Cr-contaminated soil and groundwater.
Resource Utilization of Waste Mud -- Preparation and Properties of Foamed Concrete
Authors: Du Changlin , Peng Minggang , Li Zhiwen , Ren Lizhi , Duan Jingchuan , Zhou Shixi , He Mingxing , Zhang Yutong , Wang Min
Published: August 2021

The compressed and dehydrated mud was made into filter cake, and then fly ash, silica fume and cement were added to it to prepare foamed concrete with sodium α-olefin sulfonate as foaming agent. By analysing the changing characteristics of the compressive strength, apparent density, water absorption and microstructure of the foam concrete, the key mechanism of making the foam concrete was analysed in depth. The results show that mud filter cake can improve the comprehensive performance of foamed concrete. The best mix ratio is 20% of mud filter cake, 50% of cement addition, 20% of fly ash, 10% of silica fume, 0.55 of water cement ratio and 55% of foam volume. The compressive strength of foam concrete is 1.6MPa and the apparent density is 660.26kg/m3. The water absorption rate is 23.73%, which accords with China Construction Industry Standard JG / T266-2011. Proper addition of mud filter cake can improve the pore structure and cementing material matrix of foamed concrete, and enhance the strength of foamed concrete. However, too much addition will produce connected pores and cracks, and reduce compressive strength. The results can provide theoretical basis and technical reference for mud resource utilization.
Arch dam temperature control curve adjustment and its impact
Authors: Wu Janming , Tan Yaosheng , Liu Chunfeng , Pei Lei , Wang Yajun , Hu Yu , Zhou Danna
Published: August 2021

With the improvement of intelligent temperature control technology, the “three phases and nine stages” temperature control curve used in the casting of extra-high arch dams also needs to be adjusted according to project requirements. In Baihetan Hydropower Station, the design is 120 days to reach the arch sealing temperature, but in the actual construction sometimes need to shorten or extend the length of time through the water, resulting in the arch dam concrete stress changes, so that the arch dam temperature control anti-cracking increased the difficulty. In this paper, we designed 90 days and 150 days to reach the arch sealing temperature through simulation calculation, and compared it with the standard working conditions. The results found that: shortening or extending the arch sealing temperature by 30 days brings less stress changes to the arch dam concrete, and the arch dam as a whole is in a safe range, and the temperature control curve can be reasonably adjusted according to the actual needs of the project.
Numerical Calculation and Analysis of Hydraulics about Inlet/Outlet Based on CFD
Authors: Wu Du , Yang Fei , Yu Xuesong , Li Gaohui , Zhao Ruicun , Sun Hongliang
Published: August 2021

Pumped storage power station inlet/outlet is two-way flow, the reservoir water level changes frequently during the operation of the power station. Hydraulic conditions in inlet/outlet area are complex. Inflow conditions are prone to inhalation vortices at low water levels. Outflow conditions are prone to reverse negative flow velocity, which can cause the trash rack to oscillate. Therefore, it is very important to design the the type of build inlet and outlet properly.