bluuebunny/crossref_metadata_2025_split huggingface dataset:
Solid waste management in a coastal area (Study Case: Sukolilo Sub-district, Surabaya)
Authors: Wulandari D , Warmadewanthi  , Pandebesie E S , Cahyadi M N , Anityasari M , Dwipayanti N M U , Purnama I G H , Addinsyah A. 
Published: August 2021

Abstract
The waste bank is one of the formal sectors to reduce waste in the city of Surabaya. Sukolilo Sub-District has 22 active waste banks, but eight waste banks are inactive. Also, the TPS is carrying out plastic waste sorting. The sorting activity at the TPS is much greater than the reduction through the waste bank. The purpose of this research is to analyze the recovery factor (RF) through the waste bank and TPS. The method used is interviews with waste banks and TPS as the formal sector and collectors as the informal sector. The results show that the recovery factor (RF) in Sukolilo District is still far from standard. Plastic RF in Sukolilo District is 4.79% from the standard which can be reduced by 50%. This waste reduction involves the roles of the formal and informal sectors.
Identification and Prevalence of Fungi on African Catfish (Clarias gariepinus) Fed with Pellets from Smoked Fish Waste
Authors: Nurhayati Awik Puji Dyah , Ashuri Dina Maulidina , Warmadewanthi  , Saptarini Dian , Arseto Yekti B.S , Herumurti Welly , Bachtiar Ary , Setiawan Edwin , Primiani Cicilia Novi , Firmansyah Yusuf , Putro Bayu Laksono 
Published: August 2021

Abstract
Smoked fish processing waste has a high nutritional content that can be used as a raw material for fish feed (pellets). One standard of fish pellets based on BSN is there must be no aflatoxin content produced from Aspergilus flavus. Qualitative analysis of aflatoxin content can be seen from the presence or absence of A. flavus fungi. In this study the identification of fungi on pellets, fish, and water for maintenance is discussed. Pellets made from smoked fish processing waste are grouped into: K.0 (control), K.1 (100% raw material + 0% fish feed), K.2 (70% raw material + 30% fish feed), K.3 ( 40% raw material + 60% fish feed), and K.4 (10% raw material + 90% fish feed). Pellets were given to African catfish for 30 days of maintenance. The identification of fungi was carried out on pellets, African catfish, and pond water. The identification results in three fungi namely Rhizopus oryzae, Aspergilus niger, and Fusarium oxysporum.
Analysis of Spatial Distribution of Informal Waste Collection Sites in Kupang, East Nusa Tenggara
Authors: Rumung Agustina Krisia Cornelia , Dwipayanti Ni Made Utami 
Published: August 2021

Abstract
Population growth in Kupang has consequently led to an increase in solid waste generation. On the other hand, the provision of waste management infrastructures, such as temporary waste collection sites and waste transportation services, are not distributed equally in several areas. This condition and the community’s low awareness of proper waste management have resulted in the emergence of informal waste collection sites. This study aims to examine the distribution of formal and informal waste collection sites in regards to their distribution patterns, characteristics of the sites using a descriptive survey method supported by a Geographical Information System. The study was conducted in Alak and Kelapa Lima Sub-Districts, Kupang, East Nusa Tenggara. The study identified a total of 57 informal waste collection sites, 14 sites in Alak Sub-District and 43 in Kelapa Lima. The distribution of informal waste collection sites was influenced by geophysical factors, where 79% of collection sites were located on vacant land and 53% are on local roads. However, the distribution of informal waste collection sites was not affected by population density nor the type of settlement.
Study of Life Cycle Assessment (LCA) on Water Treatment
Authors: Karnaningroem Nieke , Anggraeni Desy Risqi 
Published: August 2021

Abstract
Water Treatment Plant (WTP) with conventional systems uses pumps that work for 24 hours, and chemicals that produce residues or by-products in water processing and have an impact on the environment and humans. This study aims to identify the quality and performance of the WTP treatment, Identify the impacts arising from the drinking water treatment process and determine the efforts made to reduce the impacts identified by the method Life Cycle Assessment (LCA). The Life Cycle Assessment (LCA) method is an assessment method regarding potential environmental impacts and evaluation of the environmental performance of a process to the product. Life Cycle Assessment (LCA) consists of four stages, are Goal and Scope determination, Life Cycle Inventory, Life Cycle Impact Assessment, and data interpretation. The software used in SimaPro 9.0.0 with the impact assessment method is CML-IA Baseline. The impacts discussed in this research are Global Warming, Human Toxicity, and Eutrophication. The way to reduce the impact is based on literature studies. The results of the analysis found that the quality of raw water has not reach the quality standards as drinking water standards. While the quality of produced water has reached the quality standard. The performance of the processing unit at WTP has not worked well, therefore needs improvement with the addition of polymer in clearator, electricity usage in WTP is 11.220.195,47 kWh/year. The analysis results using Life Cycle Assessment (LCA) method, showed that the highest contribution to environmental impact was Eutrophication of 287.644,1 kg PO4--eq/year followed by Global Warming of 23.697.275 kg CO2eq/year, and Human Toxicity of 9.190.241 kg 1,4-DBeq/year. The way to reduce the impact is to take pretreatment on raw water, plan and build sludge treatment, also recycle sludge from clearator unit, replace equipment, replace aluminum sulfate, and liquid chlorine into PAC and hypochlorite salts.
Study on solar-ground source heat pump and combined heating system in severe cold area
Authors: Hao Hong , Yu Yang 
Published: August 2021

Abstract
This paper studies the operation strategy and economy of solar-ground source heat pump gas heating system in severe cold region. Two operation modes of the system are introduced: series operation and parallel operation, and the two operation modes are simulated. This paper compares and analyses the heat exchange of the ground pipe, the change of the water temperature at the inlet and outlet of the ground pipe heat exchanger, the heating efficiency coefficient cop and the refrigeration efficiency coefficient EER of the heat pump unit during the five-year operation of the combined heating system, and studies the change of the soil temperature, Finally, the economic analysis is made from the initial investment cost and operation cost of two different heating schemes. The results show that the maximum heat transfer efficiency of the parallel system is 2.5 times that of the serial system, and the total heat transfer between the parallel system and the heat network is 83.2 % higher than that of the serial system. The inlet and outlet water temperature of the buried pipe decreased under both operation modes. After five years of operation, although the operation cost of the parallel combined heating system is higher than that of the serial combined heating system, the parallel combined heating system has more advantages than the serial combined heating system in terms of the overall heating effect of the system and the influence degree of the system on soil temperature.
Research on the material properties of corroded angle steel members of the in-service transmission tower
Authors: Zhu Binrong , Su Zhigang , Huang Guo , Liao Hailin 
Published: August 2021

Abstract
The number of old transmission lines in China is increasing, and corrosion is a common problem on old transmission towers, which reduces the load-bearing performance of the tower and leads to potential safety hazards. The paper conducts investigation and sampling of the actual engineering line towers, analyzes the reasons for the corrosion of the towers, and carries out the tensile test of the specimens, and obtains the relationship curve of the elongation loss ratio, the yield strength loss ratio, the tensile strength loss ratio and the elastic modulus loss ratio with the cross-sectional loss ratio, which provides a basis for the evaluation of the load-bearing performance of the old transmission tower.
Numerical study on 3D water-air two-phase seepage characteristics of undisturbed granite residual soil at REV scale
Authors: Peichen CAI , Yun QUE , Pengfei YANG 
Published: August 2021

Abstract
To reveal the dynamic seepage mechanism of water-gas two-phase in soil, the undisturbed granite residual soil in Fuzhou was selected as the research object. Based on the computer tomography(CT) image and AVIZO-COMSOL interactive docking technology, the Level Set method was used to study the 3D water-gas two-phase seepage characteristics of the undisturbed granite residual soil at the REV scale. The results show that the residual gas in the pores is mainly distributed in blocks on the pore edges, dead corners and sudden changes of pore throats. Among the numerous pores of the REV model, there are only a few major seepage pores, which are generally characterized by wide and straight pores. In different seepage stages, the velocity distribution is different. In general, the flow velocity increases first, then decreases, and then gradually increases. The maximum velocity growth rate and decrease rate are 61.04% and 40.60%. With the increase of seepage time, the saturation of the water phase shows a sharp upward trend, and the saturation of the gas phase shows a sharp downward trend, they both occur in the initial stage of seepage, and then gradually tend to be stable. Finally, the saturation of the water phase and the residual gas phase tend to 91.86% and 8.14% respectively.
Compressive Creep Behavior of Cellulose Fiber Reinforced Concrete
Authors: Bo CHEN , Liping GUO , Wenxiao ZHANG , Yin BAI , Xiongfeng WANG 
Published: August 2021

Abstract
The effect of cellulose fiber on the long-term compressive creep performance of concrete was clarified. For this, the long-term compressive creep properties of four cellulose fiber reinforced concrete (CFRC) groups with contents of 0, 0.9 kg/m3, 1.1 kg/m3, and 1.3 kg/m3 were investigated using a spring creep tester. Loading ages of 7 days, 14 days, and 28 days, and a loading stress ratio of 0.40 were employed. Furthermore, the creep model of CFRC was established. The results revealed that the creep of concrete at three loading ages decreases by 16%, 12%, and 17%, respectively, after adding cellulose fiber to the concrete. With increasing loading age, the difference of creep degree of CFRC with different cellulose fiber content decreased gradually. Furthermore, the range of specific creep decreased from 8 × 10−6 / MPa for a 7 day loading age to 2 × 10−6 / MPa for a 28 day loading age. The change regulation of CFRC creep coefficient was similar to that of the specific creep. The influence of the cellulose fiber on the creep performance of the concrete was reflected in two aspects. On the one hand, the internal curing effect of cellulose fiber can optimize the microstructure of concrete and reduce the creep deformation. On the other hand, the fiber increases the water migration channel and defects of interface transition zone, which will increase the creep deformation. The power exponential function model for CFRC creep provided a good description of the relationship between creep and loading age and holding time. This model can be used to predict the long-term creep of CFRC under different loading ages.
Study on Quality Control of Construction Structure Reconstruction and Reinforcement
Authors: Wei Zhang 
Published: August 2021

Abstract
Compared with the new building project, the overall situation of building structure reinforcement and reconstruction is more complicated, and it will be affected by many different factors, so it is more difficult to reinforce. It can be seen that during the building structure reconstruction and reinforcement, the relevant personnel must fully grasp the specific situation of the building structure and properly cooperate with the professional design and construction, only in this way can the ideal effect be achieved. This paper makes a comprehensive study on the quality control content of building structure reconstruction and reinforcement, hoping that the content in this paper can help the relevant staff and promote the healthy and stable development of China’s construction industry.
Research on the spatial distribution and accessibility of medical institutions in Wuhan based on GIS
Authors: Wang Yi , Wu Changyou 
Published: August 2021

Abstract
To explore the rationality of the spatial distribution structure of medical institutions in Wuhan and provide a reasonable reference basis for the spatial layout of medical institutions. Using GIS spatial analysis methods to study the distribution characteristics and spatial accessibility in Guangzhou. Medical institutions in Wuhan have obvious spatial agglomeration characteristics and are concentrated in the central urban area. The spatial distribution of medical institutions in Wuhan is unbalanced and concentrated in the central urban area. The waste of health resources and the scarcity of health resources exist at the same time. The accessibility and fairness of medical institutions need to be improved, and reasonable planning and adjustment should be made.
Study on flood control projects joint flood control operation of The Daqing river basin
Authors: Zhongbo Zhang , Xiaoyan He , Simin Geng , Shuanghu Zhuang , Hui Li , Yu Tian 
Published: August 2021

Abstract
Baiyangdian Lake is an important pivotal project in the Daqing River Basin. The research on the joint flood control operation of water projects in the Daqing River Basin seems particularly important as higher requirements have been set for the flood control in the basin based on the construction of the Xiong’an New Area. In this paper, a joint flood control operation model was set up and solved with the joint flood control operation objective of minimizing the highest water level of Baiyangdian Lake. A study on the joint flood control operation under different flood conditions was carried out under the premise of ensuring the safety of reservoir projects. The optimal operation can ensure that the Wen’anwa flood storage and detention area will not be opened in the event of a hundred-year flood, reduce the highest water level of Baiyangdian Lake to a certain extent, effectively alleviate the pressure on the flood control of dikes and Baiyangdian Lake and provide support for guaranteeing the flood control safety of the Xiong’an New Area.
Design of portable recyclable drainboard set-up
Authors: Sun Zhuoqi , Wang Mingyuan , Wang Kuanjun , Xi Zunbang , Li Guo , Fu Yuchen , Wang Yajun 
Published: August 2021

Abstract
For the traditional drainboard set-up device obvious disadvantages: the structure is bulky, loading complex, often need drainage plate body, affecting the drainage effect, almost impossible to recycle, poor environmental protection performance, due to the effect of deformation, late work and other devices have interference, the drainage itself difficult to regulate in the process of setting up. In order to achieve the light, automatic, non-destructive and recyclable of drainage plate, improve the obvious shortcomings mentioned above, a series of improvements are made to the drainage plate set-up device. Through the verification of laboratory experiments, the problems such as large, bulky, high vulnerability and low recovery rate are solved, and the laboratory simulation has no suitable equipment, which reduces the space occupancy rate, saves resources and so on, and greatly reduces the cost of experiments. In water engineering applications, this new type of drainboard discount ingress than the existing drainboard plug-in machine, can be a good substitute for improving the status quo of the project.
Simulation and prediction of groundwater pollution based on GMS: a case study in Beijing, China
Authors: Zhao Xiaoning , Wang Daqing , Xu Haoli , Ding Zhibin , Shi Yue , Lu Zhao , Cheng Zijian 
Published: August 2021

Abstract
Groundwater is an important fresh water resource, which is very important for human survival. In this study, the hydrogeological information of the study area was obtained through field investigation and data reference, and the groundwater flow field in the study area was constructed using GMS (Groundwater Modeling Systems) software. The actual drilling water level data was used for verification. Based on the groundwater flow field, combined with pollution source sampling and testing data, a groundwater pollutant transport model was constructed, and the pollution situation was comprehensively evaluated. The results showed that once the landfill leachate and lead-acid battery plant waste liquid leaked in the study area, the groundwater in more than 40% of the study area will be greatly affected and it was not easy to recover. Therefore, predicting and simulating the transport of groundwater pollutants has a certain value, and can provide a scientific basis for preventing and controlling environmental degradation and protecting groundwater resources.
Hydrogeochemical characterization of Tai’an Pumped Storage Power Station reservoir and the implications for Reservoir Water Leakage
Authors: Zhang Gucheng , Yang Zhangyang , Li Guangkai , Zheng Xiaohe , Mao Changping 
Published: August 2021

Abstract
Reservoir leakage is typically a potential risk to reservoir operation in the world. In this study, Tai’an pumped storage power station reservoir was selected as an example to analyze the chemical characteristics of various waters in detail. The results showed that silicate rock weathering was the main source of water chemical ions of reservoir water, groundwater and Bashangoue water. Hydrogeochemical analysis showed that the water samples of the right bank gallery and measuring weir behind dam came from the reservoir water leakage, measuring weir of bottom gallery, B2 branch pipe gallery and No.6 construction hole water samples did not originate from reservoir water but from groundwater. The research results are of great guiding significance for guiding the diagnosis and control of reservoir leakage.
Seepage analysis of Baihetan arch dam
Authors: Wu Janming , Li Guo , Tan Yaosheng , Liu Chunfeng , Pei Lei , Song Liangfeng , Hu Yu 
Published: August 2021

Abstract
The 289m high arch dam at Baihetan has good indicators before water storage, but after water storage, seepage gradually occurs in the dam body and foundation parts, which has some adverse effects on the safety of the dam. In this paper, five monitoring instruments were used to analyze the overall dam properties during the water storage process, including the pre-buried foundation corridor pressure tube, the dam base seepage pressure gauge, the seepage pressure tube around the dam, the dam water measuring weir and the dam base drainage hole. The results show that: the seepage pressure level before the curtain of the dam base is seriously affected by the upstream water level, Post-curtain and post-drainage lift pressure is less affected by upstream water level; the flow rate of the dam measuring weir and the dam base drainage hole is more affected by the upstream water level, and the trend of flow rate changes is more consistent with the trend of the upstream water level; the rest of the parts are less affected by the upstream water level.
Study on hydrological process simulation of lumped hydrological model in Wujiang River Basin
Authors: Sun Guangru , Wen Jie , Yang Jinjin , Hou Siyu , Zhang Weihua 
Published: August 2021

Abstract
In this paper, AWBM, Sacramento, Simhyd and TANK models were used to simulate the runoff process of Wujiang River Basin from 1991 to 2004. The results show that the Nash-Sutcliffe efficiency coefficients and the relatives of the Simhyd model during verification period are 0.844 and 9.015% respectively, which meet the requirements and achieve the optimal effect. While the AWBM model has a poor performance in the simulation of runoff during flood rise period, a better performance in the simulation of runoff during flood recession period. Sacramento model has obvious “equifinality for different parameters” phenomenon due to its large number of parameters.
Research on Innovation of Experimental System Based on Vacuum Preloading Method
Authors: Fu Yuchen , Wang Mingyuan , Hu Yu , Wang Yajun 
Published: August 2021

Abstract
Aiming at the problems of traditional vacuum pre-compression technology, which is difficult to visually observe the material curing effect and low sampling accuracy, this paper independently developed a set of new modular transparent model barrels and controllable vacuum pressure manifolds. Based on traditional experimental methods, Improve the model barrels and vacuum dividers in the experimental system. Experimental research shows that the improved experimental system not only solves the shortcomings of the traditional experimental system, but also can be assembled on site, which is beneficial to the areas with abundant water resources. The project of reclaiming land from the sea provides support, which has certain production and economic benefits.
Decoloration behavior of hydrolyze sediment of ferric salt doped with magnetite on dye wastewater
Authors: Jiang Bo , Feng Shanghua , Zhang Jianping 
Published: August 2021

Abstract
Based on the strong adsorption capacity of colloidal precipitate formed by hydrolysis of iron salts (FHCP), a kind of composite material of FHCP/Fe3O4 was prepared and used in the decoloration of dye wastewater. The results showed that FHCP/Fe3O4 had high decolorization efficiency for anionic dyes. FHCP/Fe3O4 was more suitable for the decolorization of anionic dyes in acidic environment. The impact order of foreign ions on the decolorization performance of FHCP/Fe3O4 was as follows, that is HCO3
- >SO4
2- >Cl-. The fitting of adsorption kinetic of anionic dyes on FHCP/Fe3O4 matched with the pseudo-second-order kinetic equation.
Sensitivity analysis of leakage of rockfill dam caused by composite geomembrane defect
Authors: Jie Yang , Guang Cheng , Pengli Zhang , Jiaming Wang 
Published: August 2021

Abstract
To study the influence of different geomembrane defects on the seepage field of a typical concrete inclined wall rockfill dam with a dam height of 85m, the saturated-unsaturated seepage finite element theory is applied to construct a three-dimensional numerical calculation model, and the seepage field of the dam under different geomembrane defects is numerically simulated and analysed. The calculation conditions of geomembrane defect size, head height, defect position, defect number and spacing are worked out respectively, and then the influence law of composite geomembrane breakage on dam seepage under pressure head is analysed. The results of the calculation model show that when the composite geomembrane has a single size defect and different position defect. The leakage caused by defects is relatively small, which has little effect on the overall seepage of the dam; When there are many defects in composite geomembrane, there is a linear relationship between the number of defects and the seepage of the dam body. When the defects are more concentrated, the phenomenon of concentrated seepage may occur, and the seepage of the dam body changes obviously.