bluuebunny/crossref_metadata_2025 huggingface dataset:
Sustainable demand chain toward prosperity of NPD projects: a systematic review
Authors: Ganji Elmira Naghi , Shah Satya , Coutroubis Alec
Published: October 2020

Manufacturing organisations are currently experiencing a tight competition with their global rivals through new product offerings. With the viewpoint of rapid developing sustainable practices, this research pursues to investigate the impact of sustainable practices within demand‐driven distribution networks towards effective planning for product development purposes. Utilising the systematic review method of the literature, different angles of this emerging perspective will be clarified. In the first step, the authors identify new product development (NPD) approaches as well as identification of traditional supply chain and demand chain approaches followed by scrutinising the current world literature and a critical review as inputs of research findings. The systematic literature is guided by five key steps recommended by previous studies. This is conducted comprising of 75 scientific journal and conference papers from the year 2000 to 2020 towards analysis and discussions. The proposed conceptual framework provides with six propositions to be further measured, tested and validated. This research highlights the need for both academia and industries to combine the demand chain rising theories with a sustainable supply chain to act as inputs towards increasing the success rate of NPD projects.
Reinforcement learning for optimal policy learning in condition‐based maintenance
Authors: Adsule Aniket , Kulkarni Makarand , Tewari Asim
Published: October 2020

Condition‐based maintenance (CBM) involves taking decisions on maintenance or repair based on the actual deterioration conditions of the components. The long‐run average cost is minimised by choosing the right maintenance action at the right time. In this study, the CBM decision‐making problem is modelled as a continuous semi‐Markov decision process (CSMDP). It consists of a chain of states representing various stages of deterioration, a set of maintenance actions, their costs and scheduled inspection policy. The application of a reinforcement learning (RL) algorithm based on the average reward for CSMDPs in CBM is described. The RL algorithm is used to learn the optimal maintenance decisions and inspection schedule based on the current health state of the component.
Analysis and modelling on coring process of deep‐sea gravity piston corer
Authors: Wu Haoyu , Liu Na , Peng Jingping , Ge Yunzheng , Kong Bin
Published: October 2020

Taken the deep‐sea gravity‐piston corer as the prototype, a model of the corer penetrating was built based on energy conservation and by analysing the coring process. The effects of influencing parameters of the deep‐sea gravity‐piston corer on the penetration process and coring length were analysed. In addition, a comparison between the calculated values and the real examples was performed. The results show that corer weight, sediment properties and penetration velocity affect the coring performance. The penetration depth significantly increases with an increase in corer weight, and the corer weight plays an important role in the process of the corer penetrating. Moreover, the penetration depth decreases with the friction coefficient of increasing sediment, while it gradually increases with an increase in penetration velocity. It is also revealed that the penetration depth decreases approximately linearly as the core barrel diameter. Consequently, these will provide the basic data for the design and optimisation of deep‐water gravity‐piston corer.
In pursuit of giants
Authors: Donevski D. , Lapi A. , Małek K. , Liu D. , Gómez-Guijarro C. , Davé R. , Kraljic K. , Pantoni L. , Man A. , Fujimoto S. , Feltre A. , Pearson W. , Li Q. , Narayanan D.
Published: October 2020

The dust-to-stellar mass ratio (Mdust/M⋆) is a crucial, albeit poorly constrained, parameter for improving our understanding of the complex physical processes involved in the production of dust, metals, and stars in galaxy evolution. In this work, we explore trends of Mdust/M⋆ with different physical parameters and using observations of 300 massive dusty star-forming galaxies detected with ALMA up to z ≈ 5. Additionally, we interpret our findings with different models of dusty galaxy formation. We find that Mdust/M⋆ evolves with redshift, stellar mass, specific star formation rates, and integrated dust size, but that evolution is different for main-sequence galaxies than it is for starburst galaxies. In both galaxy populations, Mdust/M⋆ increases until z ∼ 2, followed by a roughly flat trend towards higher redshifts, suggesting efficient dust growth in the distant universe. We confirm that the inverse relation between Mdust/M⋆ and M⋆ holds up to z ≈ 5 and can be interpreted as an evolutionary transition from early to late starburst phases. We demonstrate that the Mdust/M⋆ in starbursts reflects the increase in molecular gas fraction with redshift and attains the highest values for sources with the most compact dusty star formation. State-of-the-art cosmological simulations that include self-consistent dust growth have the capacity to broadly reproduce the evolution of Mdust/M⋆ in main-sequence galaxies, but underestimating it in starbursts. The latter is found to be linked to lower gas-phase metallicities and longer dust-growth timescales relative to observations. The results of phenomenological models based on the main-sequence and starburst dichotomy as well as analytical models that include recipes for rapid metal enrichment are consistent with our observations. Therefore, our results strongly suggest that high Mdust/M⋆ is due to rapid dust grain growth in the metal-enriched interstellar medium. This work highlights the multi-fold benefits of using Mdust/M⋆ as a diagnostic tool for: (1) disentangling main-sequence and starburst galaxies up to z ∼ 5; (2) probing the evolutionary phase of massive objects; and (3) refining the treatment of the dust life cycle in simulations.
Exploring the coronal evolution of AR 12473 using time-dependent, data-driven magnetofrictional modelling
Authors: Price D. J. , Pomoell J. , Kilpua E. K. J.
Published: October 2020

Aims. We present a detailed examination of the magnetic evolution of AR 12473 using time-dependent, data-driven magnetofrictional modelling.

Methods. We used maps of the photospheric electric field inverted from vector magnetogram observations, obtained by the Helioseismic and Magnetic Imager onboard the Solar Dynamics Observatory (SDO), to drive our fully time-dependent, data-driven magnetofrictional model. Our modelled field was directly compared to extreme ultraviolet observations from the Atmospheric Imaging Assembly, also onboard SDO. Metrics were also computed to provide a quantitative analysis of the evolution of the magnetic field.

Results. The flux rope associated with the eruption on 28 December 2015 from AR 12473 was reproduced by the simulation and found to have erupted due to a torus instability.
The Influence of Pipe Types on The Thermal Performance of Flat-plat Closed Loop Pulsating Heat Pipe
Authors: Wu Qingping , Xu Rongji , Wang Ruixiang , Li Yanzhong
Published: October 2020

Flat-plat pulsating heat pipes (FCLPHPs) have a great potentiality in electronic cooling field and space application. In this investigation, three FCLPHPs (L1, L2, and L3) were built to study the influence of cross section shapes on the heat transfer performance of FCLPHP. One (L1) of them has asymmetric pipe, the others (L2, L3) have symmetric pipes. The results indicate that the FCLPHP L1 has the best heat transfer performance. Compared with the FCLPHPs L2 and L3, the start-up time reduces by 64% and the thermal resistance reduces by at most half respectively.
Heat Transfer and Entropy Generation Evaluation on Molten Salt Tank Foundation with Internal Water Cooling
Authors: Sun Shien , Luo Haihua , Hassan Al-Kbodi Basher , Shen Qiang , Zhang Houlei
Published: October 2020

Molten salt tanks are used to store and release thermal energy. Large heat leakage through the molten salt tank foundation to the ground and high temperature of the foundation are detrimental to long-term operation safety. Here we evaluate the heat transfer and entropy generation characteristics of molten salt tank foundations with internal water cooling. Both laminar and turbulent flows reduce the heat leakage efficiently, while the power consumption for the laminar flow is negligible. The effects of the geometrical parameters are presented. Internal fins in the cooling channels decrease the heat leakage significantly. The total entropy generation rate with foundation cooling is higher than that without foundation cooling. The entropy generation rate in the solid domain is much larger than that in the fluid domain and the flow friction irreversibility is tiny. Larger insulation layer thickness decreases the heat leakage and the total entropy generation rate simultaneously. The local entropy generation rate map helps us identify where the most irreversibility is produced. The largest local entropy generation rate for the design with foundation cooling occurs near the solid-fluid interfaces and is much higher than that without foundation cooling.
Thermodynamic Performance of Molten Salt Heat Storage System Used for Regulating Load and Supplying High Temperature Steam in Coal-Fired Cogeneration Power Plants
Authors: Luo Haihua , Shen Qiang , Chen Yunfei , Sun Shien , Lin Junguang , Zhang Houlei
Published: October 2020

In order to accept more electricity from renewable energy, cogeneration power plants are considering to reduce electricity production, which affects the heat supply. Here we present a molten salt heat storage system for coal-fired cogeneration power plants, which can supply high temperature steam to users and decouple the heat and electricity production. The first and second law-based analytical models for the cycle and a real device are built. Two water input methods are taken into account. The results show that the high and low temperatures in the two molten salt tanks influence the design of the components and the entropy generation distribution significantly. The pinch temperature difference in the discharge duration limits the lowest molten salt temperature. The device with real heat exchangers produces higher entropy generation and lower second law efficiency. Environmental water input requires more heat and entropy generation for the same steam supply. Recommendations are provided for practical designs.
Effect of ash components and atmospheres on slagging characteristics of high-AAEM lignite gasification
Authors: Fan Yanqi , Zhang Haixia , Zhu Zhiping , Dong Pengfei , Lyu Qinggang
Published: October 2020

Two kinds of high alkali and alkaline earth metal (AAEM) lignite (TTc and ZDc) were used as fuels, and three atmospheres of CO2, CO/CO2, and H2O (g) were used in the horizontal tube furnace experiments to simulate the gasification conditions in different parts of the boilers. The relevant thermodynamic calculations on the atmospheres and ash compositions were conducted in FactSage 7.2. The results show that both two coals have a high risk of slagging. Decreasing the relative content of SiO2 or increasing the relative content of Al2O3 can increase the ash fusion temperatures (AFTs) of TTc; increasing the relative content of CaO can increase the AFTs of ZDc. Besides, it is not recommended to adjust the relative content of Fe2O3. The proportion of the liquid phase of ZDc ash in CO/CO2 atmosphere is much higher than that of CO2 and H2O (g) in a typical circulating fluidized bed (CFB) gasification temperature interval, while the generation of liquid phase of TTc ash is less affected by atmospheres. The bottom of boilers is the most severe slagging zone, and purging with H2O (g) is a good way to alleviate the low-temperature slagging of the return feeder.
Study on the sensitivities and damage mechanisms of ultra-low permeability sandstone reservoirs: taking Chang 6 reservoir in Jingbian oilfield as an example
Authors: Zhu Xiulan , Ran Yanlong , Chen Zhanjun , Xu Tai , Jiang Shengling , Zhang Guangsheng
Published: October 2020

This paper takes the ultra-low permeability sandstone reservoir of Jingbian oilfield in Ordos Basin as the research object, analyzes the petrological characteristics, diagenesis, physical characteristics and pore structure characteristics of the reservoir, and carries out reservoir sensitivity evaluation by using rock casting thin sections, X-ray diffraction, and sensitive flow experiments. The research results show that the ultra-low permeability Chang 6 sandstone reservoir has weak velocity sensitivity, medium-weak water sensitivity, weak salt sensitivity, weak alkali sensitivity and strong acid sensitivity; the damage mechanism of reservoir sensitivity mainly depends on the composition of clay minerals and pore structure after diagenesis. The clay mineral content from high to low is chlorite, illite, a small amount of illite / smectite layer, and kaolinite, of which the chlorite content is as high as 75 %; the reservoir has poor physical properties, the types of small hole-thin throat and small hole-fine throat. The reservoir is prone to blockage such as bridge plugging. Therefore, ultra-low permeability sandstone reservoirs are prone to different degrees of sensitivity. The reservoir characteristics are consistent with the reservoir sensitivity evaluation results.
The influence of microstructure characteristics on electrical properties in ITO thin film
Authors: Yang Chenggang , Yang Jingyuan , Han Dongao , Li Chan , Xu Yuting , Qiu Yang
Published: October 2020

ITO thin films were deposited on sapphire substrates under different deposition parameters via ion-assistant electron beam evaporation method. Microstructure characteristics such as crystalline structure and surface morphology of as-deposited ITO thin films were studied by using X-ray diffraction spectroscopy, transmission electron microscopy and field emission scanning electron microscopy, as well as the index of sheet resistance, carrier concentration, carrier mobility and transmission in visible spectrum were tested by means of Hall effect tester and UV-VIS-NIR spectrophotometer, respectively. The influence and impact mechanism of microstructure characteristic on electrical properties of as-deposited ITO thin films were investigated and analyzed in detail.
Economic Feasibility of Echelon Utilization Battery in Photovoltaic Energy Storage
Authors: Tao Yibin , Xue Jinhua , Xia Min , Tao Jin , Zhang Qichao , Li Xiao , Liao Qiangqiang , Li Cheng , Tang Haibo
Published: October 2020

Taking the power load of an industrial park in Shanghai as an example in this paper, particle swarm optimization and cost-benefit model are employed to analyse the economy of new lithium-ion batteries, echelon lithium-ion batteries and lead-carbon batteries in photovoltaic energy storage systems in the whole life cycle. The research results showed that the economic order from large to small among different batteries in the photovoltaic energy storage system was new lithium-ion battery, echelon utilization lithium-ion battery and lead-carbon battery. The declines in energy storage cost and discount rate and the rise in peak electricity price can greatly improve the net present value of a photovoltaic-energy storage system (PV-BES) system.
Analysis of Key Technologies for New Green Marine Propulsion Systems
Authors: Duan Zheng , Chen Yajie , Gao Haibo , Liao Linhao
Published: October 2020

The new green Marine propulsion system, as a new generation of marine propulsion, has advantages of strong mobility, low fuel consumption, low noise, safety and comfort. Three green propulsion solutions for different ship types are proposed, including pure electric propulsion system, compound energy storage electric propulsion system and diesel-electric hybrid propulsion system. The structure features and performance advantages are introduced and the key technologies such as new energy storage, DC network and shaft generator/motor are discussed. The related research achievements and typical project cases are also introduced.
Orderly Charging Control Module Design
Authors: Qin Xiaomin , Zhang Xiangfei , Liu Guojing
Published: October 2020

This paper introduces the design of an orderly charging module. This paper analyzes the system structure of the orderly charging module, the embedded software architecture and business implementation mode of the orderly charging module, and introduces the hardware framework and implementation method of the orderly charging module. This design is mainly used in the charging pile of electric vehicle, which is used to realize intelligent and orderly charging, optimize energy management, provide various forms of Internet of things access scheme, and provide the software and hardware technology foundation for the reasonable management of energy.
Research on low temperature drying characteristics of different types of manure and biogas residue
Authors: Fangtao Xiu , Hongguang Zhu , Yupeng Xu
Published: October 2020

For the biogas project which does not have the ability to return to the field nearby, the outlet of biogas residue is one of the important bottlenecks restricting the development of biogas engineering. Deep dehydration and drying is a reliable basis for commercial utilization of biogas residue, especially combined with waste heat utilization of cogeneration of biogas. Therefore, three kinds of biogas residue raw materials were dried at low temperature by hot drying method in this paper. The drying temperature, the thickness of biogas residue and the backmixing amount of dry biogas residue were selected as three influencing factors. The drying time, drying rate and residual water ratio were taken as dependent variables. The drying characteristic curve of biogas residue was obtained, and the influence of each factor on the drying process of biogas residue was analyzed and compared. The results showed that the drying time of three kinds of biogas residue decreased with the increase of drying temperature. At the same temperature, the drying time decreases with the decrease of thickness. The dry biogas residue backmixing can’t optimize the drying characteristics and even increase the drying energy consumption.
Rooftop photovoltaics potential assessment：A framework to integrate technological, economic, environmental and social benefit
Authors: Ping Yu , Yifan Zhu , Peng Wang
Published: October 2020

Buildings have a significant impact on global and local energy demand and climate change. Consequently, the issue of photovoltaic (PV) potential assessment of building roofs have been extensively studied. Although studies have adopted different methods to predict the various potentials of rooftop PVs, as yet there is no understanding of a comprehensive framework for evaluating the potential of rooftop PVs. This study aims to develop a new framework to evaluate the technical, economic, environmental, and social benefits of rooftop PVs in old communities in Nanjing. The study found that the total annual electricity generation of rooftop PVs in the two districts of Nanjing was 431,136,314 KWh, which can meet about 20% of the residential electricity demand in the study area; the total electricity generation in the life cycle of 25 years was 5327909814 KWh; The economic benefit was 4.06 yuan/wp; the CO2 emission efficiency was 20.02%; the social benefit was 11.224 yuan/KWh. The results of this study will potential provide valuable reference suggestions for urban planners from the perspective of the benefits brought by rooftop PV in the two districts.
Study on policy and measures, standards and certification system of LED lighting industry in Malaysia
Authors: Ding Qing , Li Pengcheng , Liu Meng , Liang Xiuying , Chen Haihong , Wang Zhonghang
Published: October 2020

This paper introduces Malaysia’s LED lighting policy measures and standard certification system, investigates policies and measures issued and implemented in recent years to promote the development and promotion of the LED lighting industry, and analyzes the norm leading effect of LED lighting related standards and certification system on the LED lighting markets. It also puts forward the feasibility to strengthen the coordination of LED product standards and labelling with Malaysia, and develop regional technical specifications for LED products.
Effect of magnetic field on the performance of a deep eutectic solvent-based redox flow battery from polarization perspective
Authors: Cheng Rong , Ma Qiang , Zhang Weiqi , Su Huaneng , Xu Qian
Published: October 2020

In recent years, with the promotion of global renewable energy, the introduction of energy storage batteries has become more and more important. Redox flow battery has attracted more and more attention due to their environmental friendliness, safe and reliable operation. This work studies the effect of different magnetic field intensities and the duration of magnetic field addition on the mass transfer and electrochemical reaction process of iron-vanadium ions in deep eutectic solvent (DES). At the same time, the effect of magnetic field on the polarization performance of DES-based redox flow battery is also studied. The experimental results show that the iron and vanadium DES electrolytes increase their redox peak current density under the action of adding magnetic field. The test of the polarization performance of the DES-based redox flow battery shows that the addition of magnetic field can reduce the area specific resistance (ASR) of the battery and improve the polarization performance of the battery.
Relationships among energy consumption, air pollution and economic growth in China
Authors: Song Li , Kir Kalissa Fatoumata , Shu Ping
Published: October 2020

How to solve air pollution problerms in the process of economic development have arouse policy makers’ attention in China. This paper examines the long-term relationships between industrial gas emission, energy consumption and economic growth in China from 1983 to 2014. Results show that both economic growth and energy consumption have significant effect on industrial gas emission for a long period. Energy consumption is the Granger causality of industrial gas emission at the 5% significant level, but not vice versa. Economic growth is also the Granger causality of industrial air emissions, but not vice versa. In the long term, it is essential to decrease energy consumption in order to attain high air quality. Making energy policy should pay attention to improve efficiency, so as to keep balance between economic growth, energy consumption and environmental protection. When making energy and economy policies, the government need to consider the relationship between energy consumption, economic development and atmospheric protection so as to seek a balance between energy , economy and environment protection.
Ecological Restoration Modes of Soil and Water Conservation on the Mining Wasteland in Northern Grassland
Authors: Hao Rong , Dan Shan , Jingli He
Published: October 2020

Taking the mining wasteland formed in Xilinguole grassland as the research object, the ecological restoration mode of the soil and water conservation on mining wasteland was studied in the grassland. A test of water and soil conservation measures was conducted according to the characteristics of soil erosion, natural climate and etc., with the purpose of quickly restoring the damaged vegetation in mining wasteland and reducing soil erosion. The results showed four ecological restoration modes were used for the restoration on the mining wasteland, including “shrub”, “shrub + grass”, “ecological bag + grass” and “sand barriers + grass”. Two ecological restoration modes which was “shrub + grass” and “sand barriers + grass”, made the plant coverage reach more than 60%, the amount of wind erosion was less than 8.0 t/hm2, the amount of water erosion was less than 3900 t/km2•a, the effect of soil and water conservation and ecological restoration was better, and the cost of economic input was lower.
Effects of sludge properties in a combined process of mesophilic anaerobic digestion and thermophilic aerobic digestion
Authors: Zhao Zehua , Xu Yuanshun , Wang Tianfeng , Xu Xiaowei , Zhang Houhu , Hua Jing
Published: October 2020

The combination of mesophilic anaerobic digestion and thermophilic aerobic digestion (MAN-TAD) has been recognized as a suitable technology to deal with conventional activated sludge. The MAN-TAD system can make sludge achieve better stability. The retention time of anaerobic digestion (AD-time) had an important role in the sludge stabilization process. With the extension of anaerobic digestion retention time, MAN-TAD system can make sludge achieve better stability. In comparison, volatile/total solids ratio (VS/TS) at AD-time of 38 d presented the lowest values among the three different AD-time with the value of 0.32. Long retention time of anaerobic digestion resulted in high amounts of soluble organic compounds (SCOD), and extracellular polymers (EPS) in the supernatant. Such high amount of organic compounds caused deterioration in sludge dewaterability. Compared with sludges of AD-time 17 d and 24 d, sludge of AD-time 38 d became extremely difficult to dewater due to its high capillary water absorption time (CST) at the end of digestion.
Numerical simulation of co-incineration of sewage sludge and municipal solid waste in municipal solid waste incinerator
Authors: Wang Haichuan , Liao Yanfen , Ma Xiaoqian , Zeng Xianghao
Published: October 2020

Incineration is widely used as an important method of sludge and garbage utilization and harmless treatment. The simulations of co-incineration of sludge and municipal solid waste are conducted by computational fluid dynamics method(CFD) in a MSW incinerator. The study focuses on the effect of mixing proportion, moisture content of sludge, excess air coefficient and primary and secondary air distribution ratio on the combustion progress. Simulation results indicate that the combustion temperature of furnace decreases rapidly with the increase of the mixing proportion and moisture content of sludge, which is mainly because the moisture content of sludge is higher than that of MSW as well as its low calorific value. As a result, it is recommended that the water content and mixing ratio of sludge would be controlled below 40% and 7% respectively. Therefore, the fresh sludge should be dried before entering the furnace.
Research on the Sensitivity Assessment of Soil Erosion by AHP Method: A Case Study in the Northeast of Ordos Basin
Authors: Wei Wang , Sheming Chen , Lin Zhu , Lishan Meng , Rui Cheng , Futian Liu
Published: October 2020

The ecological environment of Northeastern Ordos Basin which located in the Northwestern China belongs to arid and semi-arid area. The hazards of water and soil loss here are serious caused by gully river erosion. Since Soil erosion is an important factor leading to the destruction of regional ecology and has a profound impact on the long-term and healthy development of the economy and society, it is necessary to do research on the sensitivity analysis about soil erosion. In this study, the AHP (Analytic Hierarchy Process) method was used to determine the index weight of the factors for soil erosion, and made it more consistent with the whole regional condition. The results demonstrated that the soil medium, slope and vegetation coverage had the highest influence on soil erosion under the same climatic and meteorological conditions in the study area. This research evaluated the sensitivity factors and provided a significant guidance for soil erosion control.
Study of nitrate contaminants removal from groundwater on copper modified BDD electrode
Authors: Kuang Peijing , Cui Yubo , Feng Chuanping , Einaga Yasuaki
Published: October 2020

The electrochemical nitrate reduction by using boron-doped diamond (BDD) and copper modified boron-doped diamond (Cu-BDD) electrodes was investigated at various potentials. Nitrate reduction efficiency and the products distribution was strongly dependent on the applied potential for both electrodes. The highest nitrate reduction efficiency of 77% was obtained at −2.0 V (vs. Ag/AgCl) by using Cu-BDD. Compared with BDD electrode, nitrate reduction on Cu-BDD electrode occurred at more positive potential. Copper oxides formed on BDD surface efficiently promoted enhanced conductivity of electrode to promote electrons transfer during nitrate reduction process. Meanwhile, the catalytic ability of copper was also conductive to the nitrate transformation. Therefore, the developed Cu-BDD would be a promising approach for efficient nitrate removal from groundwater.
Stabilization of multiple heavy metal contaminated soils using discarded crab shell
Authors: Feng Yijian , Zhong Zhong , Zhang Chi
Published: October 2020

Stabilizing heavy metal contaminated soil is a popular remediation model in China. Many waste biomass materials have been proven to have a stabilizing effect on heavy metals but also have several advantages like environmental friendliness and waste utilization. In this study, the waste crab shells were selected as raw materials for stabilizing agents, and the stabilization effects on different heavy metals after incineration and pyrolysis treatment was explored. The obvious stabilizing effect of pyrolytic crab shell powder on Cr and Cr6+ was observed, and the excellent stabilizing effect of the incinerated crab shell powder on Cu, Zn, Pb, Ni was also confirmed. After mixing the two crab shells, the overall stabilization effect of Cr and Cr6+, Cu, Zn, Pb, Ni and other heavy metals can reach the desired level (The stabilization efficiency of Cr, Cr6+, Cu, Zn, Pb, Ni was 89.0%, 89.1%, 93.3%, 86.1% and 96.1%,respectively).
Study on shaping slope stability of dump in eastern grassland open-pit mine
Authors: Xiaoli Guo , Jiancheng Yan , Xueliang Li , Xin Wen , Xingli Li
Published: October 2020

The dumps in the open-pit mining area in the eastern grassland are prone to landslides due to the fragile ecological environment, so it is inevitable to reshape the dump slopes. In order to explore a more scientific method for slope shaping of open-pit mine dump, slope stability analysis were used to compare effect of three types of slope-type (wave-shaped, slope-shaped and step-shaped slope shaping method)in outside dumping site of Baori Hiller open-pit mine. The results show that the slope stability is negatively correlated with the slope angle, and the stability of different shaping slopes is realized as wave-shaped slope (F=2.711)> Slope-shaped slope(F=2.513)>Step-shaped slope(F=1.047), in which the wave type and slope type are all within the safe range, but the step type slope is unstable; in consideration of cost, stability and erosion resistance, it is better to set the slope angle of the dump to 15°.The wave-shaped shaping method of the natural dumping of the excavation field outside the Baori Hiller open-pit mine has the best effect and is worth promoting.
Numerical Study of Hydrogen Addition Fuel on Soot Formation in Axisymmetric Laminar Methane/Air Diffusion Flames
Authors: Zhu Bencheng , Zhu Yuhan , Wu Jiajia , Lu Kun , Wang Yang , Lin Yuyu , Gu Mingyan
Published: October 2020

This article employs the CoFlame Code to investigate the effects of hydrogen addition to fuel on soot formation characteristics in laminar coflow methane/air diffusion flames at atmospheric pressure. Numerical calculations were carried out using a detailed C1-C2 gas phase reaction mechanism and a soot model consisting of two pyrene molecules colliding into a dimer as soot nucleation, hydrogen abstraction acetylene addition (HACA) and pyrene condensation as surface growth, and soot oxidation by O2, O and OH radicals. Calculations were conducted for five levels of hydrogen addition on volume basis. To quantify the chemical effect of hydrogen, additional calculations are performed for addition of inert pseudo-hydrogen (FH2). The addition of H2 or FH2 does not have a strong influence on flame temperature. The results confirm that hydrogen addition can inhibit soot formation in the methane/air diffusion flame by reducing both the nucleation and surface growth steps of soot formation process. The effect of FH2 addition on soot formation suppression is more remarkable than H2, indicating that the chemical effect of hydrogen added to methane prompts soot formation. The dilution effect of hydrogen addition on soot formation suppression is stronger than its chemical effect on soot formation enhancement the present findings are consistent with those of previous numerical studies.
Variation of black carbon in Northeast China based on ground observation and MERRA-2 reanalysis data
Authors: Song Qingli , Li Yanan , Yu Dajiang , Zhao Jinrong , Li Zhou , Zhang Yong
Published: October 2020

The temporal variations of black carbon concentration at 7 sites, including Longfengshan, Anshan, Benxi, Dalian, Changchun, Shenyang, and Fushun, in Northeast China was studied based on up to 11 years of ground observations and MERRA-2 reanalysis dataset. Except for Benxi, Changchun and Shenyang, at other four sites, the ground-based black carbon concentrations have decreased generally in the last decade, while changes in the black carbon concentration of MERRA-2 are relatively small. The seasonality of measured black carbon concentration shows a trend of low in May-June and high in January at all sites, and the diurnal cycles present similar pattern with two peaks occurring at 10:00-12:00 UTC and 23:00-24:00 UTC respectively, two troughs occurring at 05:00-07:00 UTC and 19:00-20:00 UTC respectively. The daily mean of MERRA-2 black carbon concentration is 49.3% lower than that of the ground observations at 7 sites averagely. They also show poor consistency in terms of seasonal and daily changes, which perhaps means an inappropriate application of MERRA-2 black carbon concentration at single point in Northeast China.
A machine learning NOxemission model for SCR system considering mechanism knowledge and catalyst deactivation
Authors: Yu Cong , Fan Wei , Yu Haiquan , Si Fengqi
Published: October 2020

In this work, an adaptive NOxemission model is proposed for a SCR system of a 660 MW utility boiler. First, 3-years operating data was collected from the plant SIS system as raw data, which was then filtered using the R-statistic method and clustered by the condensed nearest neighbor (CNN) rule to form a classified steady-state database. In addition, a sliding window approach was used to deal with the continuous data stream. As the newest steady state sample was introduced into the database, the most similar old sample in the same data class was replaced. The crowding distance (CD) operator was also used to eliminate the redundant samples. This new method RCNN-CD is proven to be a good tool to improve the representatives of the samples. Based on the selected samples, a fusion monotony support vector regression (FM-SVR) was used to establish the NOxemission model. The results show that, this model can reasonably reflect SCR mechanism and follow the degradation of SCR performance.
Research on Heterogeneous Digital Map Resource Query Algorithm Based on Web Services
Authors: Wen-bing Liu , Jun Wang , You-feng Wu , Xing-lai Feng
Published: October 2020

Based on the current situation of digital map resource interconnection and mutual inspection, this paper studies three modes of unified retrieval of traditional guided data sources, and proposes a digital map resource retrieval model based on Web Services. This paper also designs digital map resources unified retrieval result fusion algorithm and metadata update algorithm based on Web Services in detail, which can be used for the development of digital map resource unified retrieval system.
Research on Evolutionary Game of Engineering Community Members from the Perspective of Engineering Ethics
Authors: Zhu Ziming , Song Yuanzhen , Qin Menglin
Published: October 2020

Engineering ethics is a system of ethical principles applied to engineering, which plays the role of value guidance and criterion evaluation in engineering construction activities. Based on engineering ethics, writers review the Sanmenxia Reservoir Project, and use system dynamics to systematically study the evolutionary game of engineering community members, including government, enterprise, and people, involved in the engineering activities. The results show that the engineering community is a heterogeneous community with complex game behaviors, and the correct ethical choice is the key factor that promotes the evolution of the community members to cooperative dynamic equilibrium. Good management of ethical commitment, emphasis on professionalism and public services, strengthening risk alert and avoidance are effective ways for members of the engineering community to form a cooperative game, avoid tragedy of public resources, and ultimately ensure the orderly development of projects.
Research on the Development and Energy-saving of Assembling Box Buildings
Authors: Yang Li , Zhou Kuan , Salah Sarah , Zhang Shuai
Published: October 2020

Since the new era, the advancement of construction industrialization has been the focus of national attention. As an important part of the assembling building system, the box structure building has a high degree of industrialization, and has considerable development potential and industrial market. This paper first illustrates the development of box-structured buildings, and sorts out the background of box-structured buildings from foreign related theories and specific projects. Subsequently, the performance characteristics and deficiencies of box buildings in the specific construction under the current technical means are described. The paper also explores the energy efficiency of box buildings. Finally, the paper concludes with an outlook on the future development of box buildings.
Research on rainwater utilization potential and key utilization methods of sponge city in Kaifeng, China
Authors: FENG Feng , JIN Xiaoying , LIU Cui , ZHAO Ting
Published: October 2020

China is carrying out the construction of sponge city vigorously. It is necessary to estimate the utilization potential of urban rainwater resources in order to ensure the implementation of sponge city planning and construction program. There are some problems in the existing calculation models of rainwater resource utilization potential. In view of these problems, we put forward a reasonable classification system of underlying surface, built a rainwater resource utilization potential calculation model suitable for the construction of sponge city, and applied this model in Kaifeng city, and put forward specific measures for the utilization of urban rainwater chain.
Design of New Submerged Ozone Generator
Authors: Wang Hongxia , Long Yun , Ji Yuying
Published: October 2020

In order to meet the demand of adjustable ozone concentration and reduce energy consumption, a new submerged ozone generator was designed. The nozzle, reaction chamber and electrode plate were studied and optimized. The mechanical structure design of the device was completed. The electrical circuit model was built by Matlab/Simulink, the design of power system is completed. The results show that the generation and reaction of ozone are completed in the treated water to effectively reduce the temperature of the reaction chamber. Moreover, by adjusting the parameters of discharge gap and cathode plate area, ozone can be adjusted as requirement to meet the purification requirements of different water bodies. It provides the technical information and data support for further experimental research and application of the new submerged ozone generator.
Study on the superiority of a high polymer (HDPE) self-adhered waterproofing membrane in construction
Authors: Li Yudian , Li Na , Shi Yanjun , Jia Zhijun
Published: October 2020

With the rapid development of urbanization in China, people’s requirements for the quality of life and environment are constantly improving. However, the shortage of resources and the deterioration of environment are becoming more and more serious. Environmental protection has become the only way for the sustainable development of society. Therefore, the application of more and more new green building materials has become the key to the sustainable development of the construction industry. In the face of the rapid development of modern construction industry, engineering quality and functional requirements have become the basic requirements, the green environmental protection has become a higher requirement. The application of green environmental protection building materials in engineering construction is the main development direction of the transformation of modern construction industry. At the same time, it conforms to the policy of environmentally sustainable development of all sectors of society, and promotes the construction industry to meet the higher requirements of green environmental protection living environment. This paper studied the performance and waterproof mechanism of a kind of high polymer (HDPE) self-adhered waterproofing membrane and its application in construction. Compared with the traditional waterproofing membrane, the high polymer self-adhered waterproofing membrane can give full play to the advantages of environmental protection on the premise of meeting the building quality.
Analysis of pore type and micro pore structure of reservoir in fault basin--Taking Wuerxun depression as an example
Authors: Yue ZHOU , Hai-bo WU
Published: October 2020

Wuerxun depression is the two main oil-bearing depressions in Hailaer basin. Nantun Formation of Wuerxun depression is the most important oil-gas exploration layer, and reservoir characteristics are the main factors controlling oil-gas enrichment. In this paper, the mineral composition and pore type of Nantun Formation reservoir are analyzed by XRD and SEM. It is clear that the main rock types are lithic sandstone and feldspar lithic sandstone. As a whole, it is compact, with poor connectivity of pores and coexistence of primary and secondary pores. Primary pore is mainly residual primary intergranular pore, and secondary pore is the main reservoir space of Nantun Formation, which lays a foundation for further oil and gas exploration. The rock types of the target layer in the study area are mainly lithic sandstone and feldspathic lithic sandstone. Among them, Tongbomiao formation in Wuerxun depression is dominated by conglomerate, while sandstone in Nantun Formation is mainly lithic arkose and feldspathic lithic sandstone; sandstone in Tongbomiao formation and Nantun Formation in Beier depression is dominated by lithic sandstone and feldspathic lithic sandstone. The rocks of Nantun Formation are compact as a whole, with poor connectivity of pores and coexistence of primary and secondary pores. The primary pores are mainly residual primary intergranular pores, mainly of three types. Secondary pore is the main reservoir space of Nantun Formation, including dissolution intergranular pore, dissolution intergranular pore, interstitial matter dissolution pore, intergranular micro pore and micro fracture of authigenic minerals, among which intergranular dissolution pore is the most developed and super large dissolution intergranular pore is the main one.
Construction of Landscape Fire Security Patterns for Minority Settlements: a case study of reconstruction plan of Xiaozhai village in Guangxi
Authors: Wu Manni , Zheng Wenjun , Liu Zonglin
Published: October 2020

Minority settlements have good local landscape features and rich cultural heritage. However, due to complex geographical conditions and lagging economic development, there are many potential security threats in their human settlements. Based on the landscape ecological security pattern theory, aiming at eliminating the practical dilemma of frequent fires and difficult rescue in mountainous settlements in southwestern China, this paper proposes a planning idea to improve the settlement environment’s own disaster resilience and ecological endurance ability through the adjustment of landscape pattern. Taking the reconstruction planning and design of Xiaozhai Village in Longji of Guangxi province as an example, based on the geographical structure and resource characteristics of the village, a four-in-one landscape fire security pattern for mountain settlement is constructed, including building group, road evacuation system, natural fire protection network of water system and biological fire protection forest belt. The study provides a reference for the protection, renewal and re-planning of minority settlement.
Analysis and Practice of Urban Wetland Construction Technology in Mining Subsidence Water Area
Authors: Li Xueliang
Published: October 2020

The mining of underground coal resources has a great impact on the ecological environment, especially in the high groundwater level area in the East, the mining subsidence has a more severe impact on the surface water, resulting in serious surface water, and the feasibility of restoring the original land function is poor. Based on the analysis of the characteristics of mining subsidence water, this paper puts forward the key technology of urban wetland construction, and analyzes it combined with engineering examples. The results show that: in the mining subsidence water area around the city, relying on the geographical advantages and abundant secondary wetland resources of coal mining subsidence, we can shape the regional tourism image, focus on the construction of Urban Wetland Park and ecological wetland, expand the urban service function of wetland in the aspects of leisure, tourism, education and tourism, as well as the rainwater storage and water purification function of wetland. This study provides a reference for the construction of similar mining cities.
Fine quality evaluation of surrounding rock of an underground hydropower station
Authors: Bao Xiaojun , Wang Zhiyuan , Ma Shuai , Liu Gao
Published: October 2020

Using RMR surrounding rock classification method, the surrounding rock quality of underground main powerhouse of a hydropower station is evaluated with a small evaluation unit. The results of surrounding rock classification show that the surrounding rock of main powerhouse is mainly Grade III, and Grade II and IV surrounding rock develop intermittently with the depth of main powerhouse, and there is no Grade I or V surrounding rock distribution. Secondly, setting a smaller evaluation section is conducive to improve the accuracy of surrounding rock quality evaluation and better grasp the distribution of different grades of surrounding rock in the evaluation area.
Prediction of Drag Reduction Rate in Turbulent Channel Flow Based on BP Neural Network
Authors: Cao Yuchen , Yang Yongwen
Published: October 2020

The technology of turbulent drag reduction by viscoelastic additives cannot be widely applied in practical engineering due to the difficulty in judging the effect of drag reduction. To solve this problem, the experiment of drag-reducing channel flow of polymer solution was carried out based on the comprehensive analysis of the factors affecting the drag reduction rate. Abundant drag reduction rate data were obtained. A three-layer BP neural network prediction model was established with polymer solution concentration, Reynolds number and injection flow rate as input parameters. Based on the test results, the prediction accuracy on drag reduction rate of the model was analysed. The prediction and model validation of drag reduction rate are carried out further according to the historical data in literature. The results show that the predicted drag reduction rate of BP neural network is close to the real drag reduction rate in the drag-reducing flow of polymer solution. The prediction is with high accuracy and with good generalization ability. It is expected to be applied to practical projects and to promote the development of turbulent drag reduction technology by additives.