bluuebunny/crossref_metadata_2025_split huggingface dataset:
Acetylene functionalized covalent triazine frameworks with AuPd nanoparticles as photocatalysts for hydrogen evolution from formic acid
Authors: Wang Lu , Zhao Yue , Liu Linghao , Zheng Ziyi , Liu Zijun , Zhang Fuhao , Wang Lin , Fan Zhuangjun 
Published: April 2023

Abstract
Photocatalytic dehydrogenation of formic acid (FA) at room temperature is a promising way to meet the increasing demand for hydrogen energy. In this work, we loaded nanoparticles of plasmonic AuPd alloys on the acetylene functionalized covalent triazine frameworks (CTFs) for the design of Mott-Schottky catalysts (AuPd/CTFs) with further application to photocatalytic hydrogen production from FA. Experimental data showed that the introduction of acetylene (-C≡C-) unit and AuPd alloy into the CTF could significantly enhance the performance of hydrogen evolution. The results of photoelectrochemical tests showed that the introduction of carbon-carbon triple bonds and AuPd alloy could adjust the electronic structure of CTF and inhibit charge recombination. Thus, benefiting from these positive effects, the FA photocatalytic decomposition by the obtained AuPd-CTF-EDDBN photocatalyst yielded H2 at a good rate of 10600 μmol·gcat
−1·h−1.
An analysis of new electrification potential of final energy consumption in southern China under the goal of carbon peaking and carbon neutrality
Authors: Wang Jiayang , Wang Ke , Zhuo Yingjun , Xie Pingping 
Published: April 2023

Abstract
Under the constraint of peak carbon dioxide emissions before 2030 and carbon neutrality before 2060, the current status of the economy, social demography, energy consumption, industrial structure, energy intensity and power consumption in southern China is analyzed, the scenario analysis method is built, three policy scenarios affecting electrification under the constraint of the goal of carbon peaking and carbon neutrality are designed for the analysis of the future power demand in southern China, and the implementation path of new electrification that can achieve the goal of carbon peaking and carbon neutrality is proposed.
Day-ahead scheduling of the electrothermal integrated system considering multiple thermal inertia
Authors: Dai Mengdi , Ke Deping , Cui Yibo , Ling Zaixun , Zheng Jingwen 
Published: April 2023

Abstract
For the problem of optimal scheduling of integrated energy systems involving wind power consumption, by mining multiple thermal inertia, a stochastic optimal scheduling strategy with consideration of mixed uncertainties is proposed. Firstly, the network thermal inertia is explored by considering the dynamic characteristics and thermal storage of heat network. Then the heat load flexibility constraint is introduced to model the thermal inertia of buildings. Finally heat pumps and heat storage are used as time-shiftable loads or sources, which are jointly modelled with CHP units to solve the peak-valley mismatch of electric and heat loads, and on this basis, the model is established. In this paper, the Barry Island’s case which is composed of 33-node thermal network coupled with 9-node grid system is used as an example for analysis, and results show that by exploring the multiple thermal inertia, both the complementarity and the flexible dispatch between multiple heterogeneous energy sources in integrated energy system can be realized.
Refrigerant overheating in the compression circuit air heat pump
Authors: Fedosov Sergey , Fedoseev Vadim , Zayceva Irina , Voronov Vladimir 
Published: April 2023

Abstract
The authors considered the processes of phase transformation of the working fluid in the compression unit of the freon circuit in the section “thermal expansion valve (TEV) - evaporator - compressor”. By adjusting the expansion valve under the conditions of the bubble mode of boiling of the refrigerant, the evaporation process takes place, accompanied by the achievement of a certain excess of steam temperature. Determination of rheological parameters (droplet size, vapor viscosity, refrigerant droplet vaporization rate) is necessary so that when moving from the throttle valve (TEV) to the compressor inlet, they have time to go into the vapor phase or return to the mass of boiling liquid. The article presents the results of an analytical calculation of the parameters of the kinetics of evaporation of Freon droplets as they move in a steam flow. The results of such an analysis make it possible to formulate requirements for the optimal droplet size in the created vapor-liquid mixture in order to ensure their maximum evaporation and the required thermal efficiency of the AHP as a whole. The established patterns of evaporation of refrigerant droplets can be used to select the design and operation of the AHP.
Speed-and-pressure combined control for the CPHPTO of an inverse pendulum wave energy converter
Authors: Yue Xuhui , Liu Jiaying , Ma Shihao , Liu Guanchen , Ming Guangqiang , Chen Qijuan 
Published: April 2023

Abstract
Constant pressure hydraulic power take-off (CPHPTO) utilizes a high-pressure accumulator to weaken its oil pressure fluctuations. However, CPHPTO operating point still changes violently under the circumstance of the changeable irregular waves as well as the limited volume of the high-pressure accumulator. This causes CPHPTO to work away from the designed operating point and even to run in the inefficient and unstable region. This paper proposes a speed-and-pressure combined control (SPCC) strategy, which keeps system speed/pressure around the designed value via the vector control of a PMSG or the displacement tuning of a hydraulic motor, for the efficient and stable operation of a CPHPTO. A SPCC strategy for the CPHPTO embedded in a novel inverse pendulum wave energy converter (NIPWEC) is designed in detail. Furthermore, the overall wave-to-wire dynamic model is simulated in irregular waves to research the effect of SPCC. Results show that both the SPCC with an oil pressure open-loop regulator (OPOLR) and the SPCC with an oil pressure closed-loop regulator (OPCLR) can effectively stabilize the system speed/pressure. Besides, SPCC, especially the SPCC with OPCLR, can effectively improve both the efficiency and stability of CPHPTO. Moreover, system-speed control is more significant than system-pressure control in terms of improving CPHPTO efficiency.
Multilayer composite nanofibrous film accelerates the Li+ diffusion for quasi-solid-state lithium-ion batteries
Authors: Yan Yingchun , Liu Zheng , Yang Xinhou , Fan Zhuangjun 
Published: April 2023

Abstract
The rational design of dense and flexible solid-state electrolytes (SSEs) with interface compatibility is still challenging. Here, we report a three-layer dense 3D nanofibrous matrix (PCOF) by constructing a nanofiber framework combining polyacrylonitrile (PAN) and fast Li-ion conductor covalent organic frameworks (COFs) by electrospinning method. PCOF film can maintain an extraordinary electrolyte/electrode interface and an interconnected ion-conduction pathway, accelerating Li+ diffusion. The PCOF quasi-solid-state electrolyte (QSSE) has high oxidative stability (4.70 V, versus Li+/Li) and ion conductivity of 2.94×10−4 S cm−1 at room temperature. Lithium-ion battery based on PCOF QSSE with LiFPO4 (LFP) cathode exhibits outstanding rate characteristics and cycling stability. This multi-layer composite strategy will start a new area of QSSEs lithium-ion electrolytic devices, and simultaneously accelerate the design of electrolytes featuring a wide range of properties.
Evaluation study on the coordination of marine resources, the environment and social economy: take Taizhou Bay as an example
Authors: Yan Jishun , Wang Peng , Yue Xihe , Chen Chong , Zhang Can , Wang Xiaoyu 
Published: April 2023

Abstract
The sea is an important aspect of development in bay areas. Coordinated development of the marine resource environment and social economy is an inevitable requirement for high-quality development of the marine economy. This paper builds an index to evaluate the coordination of marine resources, environment and social economy in bay areas from four aspects: resource and environmental effects, resource utilization compliance, socio-economic development conditions, and technological investment and development status. The model is implemented for Taizhou Bay. The results show that the overall level of coordination between its marine resource environment and social economy is poor, under 0.4. The main reasons for this situation are the decline in environmental quality of bay resources, and insufficient technological investment and development. In view of the problem of uncoordinated regional development, this paper puts forward two suggestions to provide technical support for the high-quality development of Taizhou Bay: implementation of land and sea resource control, and increased investment in environmental repair technology in the bay.
Spatial and temporal changes of runoff in the Yellow River in recent 15 years
Authors: Li Weiqing , Liu Yixin , Qian Hui , Zhang Yuting , Xu Panpan 
Published: April 2023

Abstract
In this study, the runoff data from 12 representative stations in the Yellow River from 2005 to 2020 is utilized, and the Mann-Kendall trend test is used to examine the changes in the observed runoff of the Yellow River. The results show that the annual runoff has grown in the upper reaches and has gradually reduced along the river flow direction. It is because the runoff is mainly affected by precipitation and human activities. In addition, the runoff mutation of each hydrological station is not consistent. This may be caused by many factors, resulting in the complexity of annual runoff changes. The findings can reveal runoff sequence variation of the Yellow River and provide a theoretical basis for river management.
Correlation analysis between noise reduction function and biological structure of Acer truncatum crown
Authors: Chen Fang , Wang Mingyue , Chen Ruimin , Li Zhandong 
Published: April 2023

Abstract
Taking Acer truncatum as the research object, this paper discusses the influence of structural changes on the noise reduction effect, and quantitatively measures and analyzes the biological structural characteristics and noise reduction effect. The conclusions are as follows: 1) structural changes, especially the changes of branches and leaves, have a significant impact on the noise reduction effect of the crown. The noise reduction effect of the complete crown is the best. With the thinning of branches and leaves, the noise reduction ability of the crown gradually decreases. The noise reduction ability of the complete crown >2/3 crown >1/4 crown >0 crown. 2) All the 17 biological structures have a very significant impact on the noise reduction effect of the crown. The light transmittance, porosity and branch density of the crown are the key structures that affect the noise reduction effect of the crown of Acer truncatum. The light transmittance and porosity of the facade are negatively correlated with the noise reduction effect, and the branch density is positively correlated with the noise reduction effect. The smaller the gap between branches and leaves in the crown and the denser the branches, the better the noise reduction effect of the crown.
Effect of substrate on two anammox packing filler systems
Authors: Wang Weiqiang , Xiong Deqi , Su Yang , Zhu Jinghai , Fu Jinxiang 
Published: April 2023

Abstract
The article investigated the effect of substrate ratio and shock load resistance on the nitrogen removal efficiency of curtain packing anammox filler and bundle packing anammox filler. The results had shown that the nitrogen removal performance was recommendable when the NH4
+-N: NO2
−-N was set as 1:1.20, regardless of the curtain packing filler or the bundle packing filler. After the total nitrogen concentration was directly increased from 770 mg/L to 1320 mg/L for 12 h. From the perspective of the steady of nitrogen removal performance, the bundle packing filler was better than curtain packing filler, and the effluent TN concentration was beyond 70 mg/L. Subsequently, within 1 day when the influent TN concentration increased to 770 mg/L, both filler systems quickly recovered. The structure of the bundle packing was beneficial to the fixed, cultured, and aggregation of anammox bacteria made it a better filler type. The high-throughput results showed that the dominant bacteria in the two packing fillers was Candidatus Kuenenia, which accounted for 15.16% and 22.85% in the curtain packing filler and the bundle packing filler system respectively.
Sediment characteristics and sedimentary environment analysis of a sandbar-lagoon system developed at the estuary of Fudu River, China
Authors: Zhang Pan , Zhang Lianjie , Yan Jishun , Zhao Bo , Lin Xia , Li Shuxian 
Published: April 2023

Abstract
Developed at the estuary of Fudu River, the sandbar-lagoon system there occupies the longest sandy coastline of east coast of Liaodong Bay, China. Over the past several decades, substantial changes are believed to have occurred over the system regarding its sedimentary characteristics and dynamic environment, partly due to the anthropogenic influences. However, few studies have been reported to investigate such evolution. To fill this gap, grain size analysis was conducted with 52 sediment samples to reveal the sediment distribution patterns. In addition, the sedimentary environment and sediment transport trend were studied using the Pejrup M triangular diagram and Gao-Collins grain size trend analysis method. Our results show that the surface sediments are mainly sandy with coarser sediment found over the northern part of the sandbar whereas fine-grained sediments are mainly in the lagoon area. The sedimentary dynamics environment can be divided into the northern area of sandbar and the lagoon area. The relatively larger grain size, low sorting coefficient and positive skewness in the northern part of sandbar indicates a strong and stable hydrodynamic environment dominated by waves and currents. Meanwhile, the small mean size, high sorting coefficient and negative skewness in the lagoon area implies a weak hydrodynamic environment due to significant reduction of hydrodynamic strength. In the lagoon area, the sediments are transported mainly from coastal ocean to the interior of lagoon in suspension. Our study provide basin understanding of the controlling dynamics on sandbar evolution, and can provide guidelines for the preservation of the sandbar-lagoon system.
Experimental study of the effect of CO2 on rock seepage characteristics
Authors: Guo Xing , Sun Xiao , Liu Yiting , Mu Jingfu , Qiao Hongjun , Wan Xin 
Published: April 2023

Abstract
The influence of different phase states of CO2 on the seepage characteristics of different rocks is one of the most important factors to enhance shale gas exploitation, such as CO2 fracturing and displacement, and achieve CO2 geological storage. Rock soaking experiments with different CO2 phase states were carried out to compare and analyze the influence of permeability, contact angle, starting pressure gradient and other seepage characteristic parameters of sandstone and shale before and after soaking. Research shows: After soaking in liquid and supercritical CO2, the permeability and contact angle of sandstone and shale increase in varying degrees, and the starting pressure gradient decreases in varying degrees. After soaking in liquid CO2, the permeability of sandstone and shale increased by 1.71% and 12.88% respectively, the contact angle increased by 3.23% and 7.47% respectively, and the starting pressure gradient decreased by 3.02% and 5.88% respectively. After supercritical CO2 immersion, the permeability of sandstone and shale increased by 37.37% and 48.82% respectively, the contact angle increased by 19.27% and 36.80% respectively, and the starting pressure gradient decreased by 35.39% and 39.34% respectively. Compared with sandstone, the seepage characteristics of shale after soaking in liquid and supercritical CO2 have greater changes; Compared with liquid CO2, the seepage characteristics of sandstone and shale change more after supercritical CO2 soaking. With the increase of supercritical CO2 soaking time, the contact angle of sandstone slightly increases, while that of shale obviously increases. Compared with liquid CO2, the change of seepage curves of sandstone and shale after supercritical CO2 soaking is more different.
Applicability analysis of different evaluation methods in groundwater quality evaluation: A case of Xi’an city
Authors: Li Siqi , Shi Xiaoxin , Qian Hui , Xu Panpan 
Published: April 2023

Abstract
In order to find a suitable method for the evaluation of groundwater quality in Xi’an, the principles of single factor evaluation method, fuzzy comprehensive evaluation method and modified fuzzy comprehensive evaluation method are briefly described. Three methods are applied to the comparative analysis of water quality evaluation of 34 phreatic water samples in Xi’an. The results show that: (1) The results of fuzzy comprehensive evaluation method are more optimistic than those of single factor evaluation method. (2) The single factor evaluation method is simple in calculation and can directly reflect the degree of pollutants exceeding the standard in water, but the evaluation results are too one-sided to reflect the actual situation of water quality; The fuzzy comprehensive evaluation method and the modified fuzzy comprehensive evaluation method more comprehensively consider the comprehensive impact of evaluation factors on water quality, and their results are more objective than the single factor evaluation method. (3) The modified fuzzy comprehensive evaluation method improves the accuracy of the membership matrix by changing the critical value of Class V water. The weighted average calculation method avoids the error caused by the square term of concentration, so that the evaluation results will not be distorted. It is a very effective evaluation method, which should be promoted.
Formaldehyde degradation of waterborne paints over S- and C-doped titanium dioxide under visible light
Authors: Yao Kang , Meng Weijun , Huang Qiaorong , Wang Wukang , Che Xihong , Fang Hong , Duan Ran 
Published: April 2023

Abstract
Fabrication technique of S- and C-doped TiO2 nano-particle via solvo-thermal treatments was introduced, and its appearance and crystal property were studied using transmission electron microscopy, energy-dispersive X-ray and powder X-ray diffraction. All of these characterisations gave a reasonable explanation to satisfactory doping of S and C in the anatase. The photo-catalytic oxidation was conducted in environmental chambers, together with UV-VIS spectra. The catalytically active S- and C-doped anatase was assessed via surveying the formaldehyde degradation of waterborne paints, and a removal efficiency of 93.9% in 85 min illustrated an enhanced visible-light activity.
Synergistic degradation of malachite green by water surface plasma combined with Fe2+/PMS
Authors: Hua Weijie , Kang Yong , Liu Shuai 
Published: April 2023

AbstractWater surface plasma (WSP) discharge technology coupling with Fe2+and peroxymonosulfate (PMS) was investigated for the degradation of malachite green (MG) dye wastewater. The effects of Fe2+dosage, PMS dosage, input voltage and solution initial conductivity on the degradation of MG were investigated. When the Fe2+dosage was 125 μM, PMS dosage was 0.5 mM and input voltage was 16 kV, the degradation performance and reaction rate of MG reached 96.3% and 0.219 min−1within the discharge time of 15 min. When increasing the initial conductivity from 31.1 μS/cm to 1000 μS/cm, degradation efficiency of MG decreased from 97.9% to 94.1% with the decrease of only 3.8% and degradation rate declined by only 0.074 min−1.
Comparative study of fire characteristics of aged and unaged pinewood
Authors: Huang Jiaxin , Song Lei , Wang Jian 
Published: April 2023

Abstract
Wood has become a promising and more eco-friendly option for modern structures. This work aims to comparatively investigate the combustion characteristics of the aged and unaged wood samples. The tests were conducted by cone calorimeter under the heat fluxes ranging from 35-55 kW/m2. Critical parameters including ignition time, heat release rate and concentration ratio of CO/CO2 were measured and analyzed.
Influence of space electromagnetic radiation on physical characteristics of atmospheric suspended micro particles
Authors: Han Binbin , Ming Zhengfeng , Zhao Yuhu , Wen Tao , Xie Meilin 
Published: April 2023

Abstract
In recent years, researchers from various countries have found that atmospheric microparticle pollution occurring around the world has seriously endangered human health and the earth’s ecological environment. In order to solve the problem of atmospheric micro-particle pollution, researchers have carried out multi-faceted analysis on its source, composition and causes of pollution. However, few people combine the complex electromagnetic environment in space with the problem of micro-particle pollution in recent years. In this study, it is found that atmospheric suspended microparticles have weak magnetism and carry charge, so it is preliminarily explored whether space electromagnetic radiation has an effect on microparticles. Based on this background, this study used simulation modeling and experimental verification methods. The results show that the physical properties of atmospheric suspended microparticles will be significantly changed by electromagnetic radiation.
Study on the response relationship between land use and eco-environmental quality - a case study of Jing-Jin-Ji urban agglomeration
Authors: Ji Jianwan , Jiang Linlin , Sheng Tian , Chen Yi , Zhang Rui 
Published: April 2023

Abstract
In view of the complexity of traditional eco-environmental quality evaluation index system and the time-consuming calculation, this paper used remote sensing ecological index (RSEI), combined with MODIS products and GEE platform, to quantitatively evaluate the eco-environmental quality and land use in Jing-Jin-Ji from 2010 to 2020, and analysed the response relationship between eco-environmental quality and ecological land. The results showed that: 1) The eco-environmental quality in Jing-Jin-Ji showed a “V” shaped change trend in the past ten years, with its average value first decreased from 0.51 to 0.46, and then increased to 0.48; 2) The dynamic degree of arable and grass land in Jing-Jin-Ji was negative, while forest land was positive. The average annual increment of construction land was the highest (638.72 km2•y−1); 3) There existed good consistency between the average RSEI value and the change trend of ecological land in Jing-Jin-Ji, but the change rate was not synchronous, which showed that the increased rate of ecological land was higher than the decreased rate, while the increased rate of the average RSEI value was significantly lower than the decreased rate, reflecting that the recovery rate of eco-environmental quality was lower than the degradation rate.
Equations for a K3 Lehmer map
Authors: Brandhorst Simon , Elkies Noam 
Published: April 2023

C. T. McMullen proved the existence of a K3 surface with an automorphism of entropy given by the logarithm of Lehmer’s number, which is the minimum possible among automorphisms of complex surfaces. We reconstruct equations for the surface and its automorphism from the Hodge theoretic model provided by McMullen. The approach is computer aided and relies on finite non-symplectic automorphisms,

p
p

-adic lifting, elliptic fibrations and the Kneser neighbor method for

Z

\mathbb {Z}

-lattices. It can be applied to reconstruct any automorphism of an elliptic K3 surface from its action on the Neron-Severi lattice.