Green Environmental Protection Research Articles

Study on water resistance improvement of wood dowel rotation welding joints

Rotation welding of wood dowels has the advantages of high bonding strength, fast processing speed and green environmental protection, and is suitable for jointing nodes in furniture and wood products. However, most wood friction welding specimens have poor water resistance where the welded joints are more likely to be damaged in wet environments, which greatly limits their wider application. Previous studies focused on using natural and green materials or methods to enhance bonding strength and water resistance of friction-welded joints. This paper reveals an innovative chemical pretreatment method to improve the water resistance of rotary friction welded joints by treating the substrate blocks or dowels with reagents that successively oxidize and sulfonate the wood, and spraying the dowels with Zinc acetate alcohol solution that has a lubricant effect, followed by friction welding. The findings show that both the dry bonding strength of friction welded joints and the wet bonding strength after impregnation with cold, hot, and boiling water of dowels pretreated with oxidation and sulfonation reactions were higher than those without pretreatment and significantly superior to the traditional polyvinyl acetate (PVAc) adhesive bonding.

Energy Saving E Butler - an Integrated Device for Predictive Regulation Based on Smart Buildings

As of today, "carbon emission exceeds the standard" has seriously affected people's life, and it has become the responsibility and obligation of every citizen to monitor and reduce the carbon emission beam. At present, China is the world's largest construction market, and most of the new buildings are still high-energy buildings, and the proportion of building energy consumption is increasing. Nowadays, China's economy and society are developing in the direction of low-carbon economy and green environment protection. Therefore, this paper develops an "integrated system of predictive control based on smart building", which first classifies the people in the building by statistical methods, and then constructs the demand curves of different people for each control parameter in the building through the people behavior model. Based on the demand curve, the optimal control scheme for energy saving in the building is made on the premise of meeting the demand of most people for environmental comfort, and then the optimized control parameters are applied to the actual regulation through a series of sensors and control elements to realize fully automatic control of the building facilities.

Effect of green taxation on pollution emissions under ESG concept

Given the global ecological environment deteriorating, the ESG (environmental, social, and governance) concept advocates that economic growth and environmental protection must go hand in hand. Green taxations, in particular, are critical to economic development as they serve as a key lever for the government in regulating the national economy and improving environmental quality. This paper aims to examine the pollution reduction effect of green taxation in China. We constructed fixed effect model using provincial panel data from 2012 to 2017 to empirically examine the effect of green taxation-including environment protection tax, consumption tax, resource tax, and vehicle purchase tax-on pollution emissions. The findings show that environmental protection tax has a significant inhibitory effect on exhaust gas emissions but a poor inhibitory effect on wastewater and industrial solid waste emissions. Other green taxations-consumption tax, resource tax, and vehicle purchase tax-do not have an ideal inhibitory effect on pollution emissions. The paper concludes with policy recommendations organized around improving the environmental protection tax, actively promoting the ESG concept, and optimizing the top-level design of the green taxation system.

Calculation Theory of Counterweight Double-Row Pile Support for Deep Foundation Pit in Reclamation Area and Influence Analysis of Core Pile Parameters

The theoretical calculation of a counterweight double-row pile supporting structure is deduced and studied in this paper. The derived calculation method is applied to a Midas GTS NX simulation calculation. A case study of a deep foundation pit project in Shenzhen City is used to verify and analyze the simulation results and the field monitoring results. On this basis, the influence law of deformation parameters such as the row distance, pile diameter of back-row piles and load of the pit top on the pile of a double-row pile is further discussed. The results show that both the front- and back-row piles of counterweight double-row piles are overturning deformation, and the characteristics of the horizontal displacement are basically the same. The maximum value of the horizontal displacement of the pile is at the top and the minimum value is at the bottom. With the increase in the row distance and pile diameter, the horizontal displacement of the pile becomes smaller, and the change in the pile horizontal displacement under a top load is contrary to that. Moreover, the change in the row distance has a great influence on the horizontal displacement of the pile, followed by the load of the pit top, and the pile diameter of the back-row piles has the least influence. Due to the connection effect of the horizontal plate of the counterweight platform, the whole supporting structure is in the form of a hyperstatic structure. The back-row piles can withstand most of the lateral earth pressure, which effectively reduces the deformation of the front pile and improves the overall stiffness of the supporting structure, which is conducive to the excavation stability of the deep foundation pit. Therefore, its extensive use in the Linhai soft soil project can not only effectively reduce the number of internal supports and achieve the purpose of cost saving but also increase the construction face, which is beneficial to the development of dry construction organization and management, in line with the construction concept of green environmental protection and sustainable development advocated at present.

Can New-Type Urbanization Promote Enterprise Green Technology Innovation?—A Study Based on Difference-in-Differences Model

China proposed a new-type urbanization (NTU) strategy in 2012 to solve ecological and environmental problems caused by the traditional rapid and rough urbanization development model. Focusing on the policy’s important goal of building green and smart cities, it is crucial to explore whether the pilot of NTU promotes green innovation at the enterprise level, and thus achieves green environmental protection. Based on data from 1717 Chinese listed companies’ green patent applications between 2011 and 2020, this paper studies the impact effect of NTU on enterprises’ green technology innovation utilizing the difference-in-difference model combined with the PSM-DID method. The findings indicate that: NTU has a substantial effect on enterprise innovation in green technologies. The mechanism analysis shows that NTU can encourage green technology innovation in enterprises by easing their financial restrictions. This requires the government to encourage enterprises to engage in green technology innovation by alleviating their financing constraints and reducing their debt financing costs through policy incentives and financial subsidies. Heterogeneity analysis shows that the impact of the policy on green innovation is more significant in the central and western regions, highly marketable areas, non-heavy-polluting industries, and among enterprises with higher levels of green innovation.

Ring slot CP antenna for the hybrid electromagnetic solar energy harvesting and IoT application

The research proposed a compact antenna integrated with dual-function solar cells to optimize internet of things (IoT) communication devices and energy harvesting. The use of integrated solar cells with electromagnetic elements as antennas and energy-gathering in a design is a solution for wireless communication sensors and simultaneously electromagnetic and solar energy harvesting. Radiation performance testing of solar cell antennas and optical experiments were carried out to test the ability of solar energy collection. A double feed ring slot circular polarization (CP) antenna coplanar antenna with a configuration has highly sensitive to vertical and horizontal waves. It is to accommodate the impact of circular polarization wave and solar cell distortion on antenna performance. This technology promises green communications, renewable energy, and environmental protection to combine wireless communication and green battery components. The study presents the performance and design results of a double line-feed microstrip antenna circuit connected with CP antenna on the S-band for IoT communication by accommodating electromagnetic energy transmission. The importance of adopting an integrated radio frequency (RF) solar energy harvesting strategy rather than a single source method makes this research very significant in its novelty by optimizing the analysis of multiple signal access in IoT communications.

Green Chemistry Education Concept Transited by a Comprehensive Experiment of Citrus Peel Conversion and Utilization

To improve the comprehensive experimental skill of undergraduate and penetrate the concept of green chemistry education, we combined with the teaching needs of applied chemistry and designed a comprehensive experiment of preparing green drilling fluid treatment agent with waste citrus peel as raw material. Citrus fruit peel contains a lot of plant phenols, cellulose, soluble polysaccharides and other components, which can be used as drilling fluid to increase viscosity and reduce filtration loss. However, the proportion of water-soluble substance in citrus peel is low and the effect is poor. Therefore, to improve its utilization efficiency, we have applied different methods to modify the raw material, including the pretreatment, crosslinking, carboxymethylation to increase the proportion of water-soluble substance and improve its performance in drilling fluid. This experiment has introduced knowledge of organic chemistry to oilfield chemistry and combined experimental skills with field work, which will help to improve students' professional skills and field adaptability. In addition, using discarded citrus fruit peels as raw material in the experiment can practice the concept of green environmental protection, which is helpful to guide the future clean production of the oilfield and promote green and low-carbon development.

Control Methods for Levitation System of EMS-Type Maglev Vehicles: An Overview

As new advanced vehicles, electromagnetic suspension (EMS)-type maglev trains have received wide attention because of their advantages such as high speed, no mechanical friction, low noise, low cost and energy consumption, strong climbing ability, and green environmental protection. The open-loop instability is one of the key points and difficulties for the levitation control systems of maglev trains. The closed-loop feedback control method must be applied to realize stable levitation. However, there are currently many levitation control methods just in theory. Considering their advantages and disadvantages, it is a major demand for maglev trains to select efficient, stable, applicable, and cost-saving methods to improve their dynamic performance and safety, which motivated this review. First, the current status of research on maglev trains is introduced in this paper, including types, system components, and research modes in various countries, followed by an analysis of the levitation control methods for EMS-type maglev trains. Then, the technical characteristics of the levitation control systems are described according to the basic principles of levitation systems, model building, mathematical derivation, and control objectives. Next, three kinds of typical levitation control methods are reviewed, namely, linear state feedback methods, nonlinear control methods, and intelligent control methods, according to their improvements and applications. Lastly, we summarize and evaluate the advantages and disadvantages of the three methods, and future developments of levitation control are suggested.

Impact of green finance and environmental protection on green economic recovery in South Asian economies: mediating role of FinTech

Impact of green finance and environmental protection on green economic recovery in South Asian economies: mediating role of FinTech

Directors' and officers' liability insurance, environmental regulation and firms' envi ronmental responsibility

This study examines the relationship among directors' and officers' liability insurance (D&O Insurance), environmental regulation, and firms' environmental responsibility-taking. Using the data on firms' green innovation achievement and environmental protection investment from China, where the information of D&O Insurance purchases was disclosed, we find robust evidence that insured firms significantly promote firms' environmental responsibility-taking, evident in more green innovation achievement and environmental protection investment. This positive association is more pronounced for firms exposed to stronger environmental regulation. In addition, we document that the moderating effect of environmental regulation is stronger for SOEs, firms with better corporate governance, operating in heavy-polluting industries, and exposed to a stronger institutional environment. Further mechanism analysis shows that public supervision is the underlying channel through which D&O Insurance affects firms' environmental responsibility. Overall, our findings imply that D&O Insurance, one of the important corporate governance mechanisms, motivates directors and officers to actively practice firms' environmental responsibility, and environmental regulation exerts a positive influence over this governance effect.

Synthesis of strong magnetic response ZIF-67 for rapid adsorption of Cu2.

With the acceleration of industrialization and urbanization, global water resources have been polluted. Among the water pollutants, heavy metals have caused great harm to the environment and organisms. When the concentration of Cu2+ in water exceeds the standard, the intake of the human body will mainly damage the nervous system. We use MOF materials with high chemical stability, specific surface area, adsorption, and other unique properties to adsorb Cu2+. MOF-67 was prepared with various solvents, and a stronger magnetic response MOF-67 with the largest surface area and best crystal form were selected. It quickly adsorbs low-concentration Cu2+ in water to purify water quality. At the same time, it can be recovered promptly through an external magnetic field to avoid secondary pollution, which conforms to the concept of green environmental protection. When the initial concentration of Cu2+ is 50mg/L for 30min, the adsorption rate reaches 93.4%. The magnetic adsorbent can be reused three times.

Infiltration Approach of Green Environmental Protection Education in the View of Sustainable Development

In today’s world, global ecological environment problems are increasingly serious, and human beings have gradually realized the importance of protecting the ecological environment. With the continuous deepening of the concept of sustainable development, the concept of green education has also aroused great attention in the education sector; moreover, its concept has gradually been applied to education and teaching. However, there are many problems in the application of green education. For example, the current green education system is not sound, the importance of green education in schools is not obvious, and there is no effective green teacher training program. In order to improve the current application of green education, this paper proposes to integrate the concept of sustainable development into the teaching of green environmental protection education. Through the construction of a sound green education system and green education classrooms, green ecological ideas would thus be infiltrated into many aspects of education and teaching. Due to the uneven distribution of educational resources in many regions, the quality of education in these regions is also uneven. In order to improve this situation, this paper also constructs an educational resource distribution model. Furthermore, this paper also analyzes the educational resource allocation model by using a differential evolution algorithm. From the experimental results, under the algorithm in this paper, the average student–teacher ratio of each county was 4.93, and the average number of books per student was 38.92. The average running time of teacher resources and book resources allocated by the model was found to be 1.47 s and 1.39 s, respectively. Under the traditional algorithm, the average student–teacher ratio in each county was 5.93, and the average number of books per student in each county was 31.8. The average running time of teacher resources and book resources allocated by the model was 2.36 s and 2.58 s, respectively. It can be seen from the above data that the algorithm in this paper can effectively optimize the allocation rationality of the educational resource allocation model and shorten the running time of resource allocation.

Preparation of asymmetric Janus hollow silica microparticle and its application on oily wastewaters

Janus nanoparticles have aroused the interest of scholars because of their highly efficient emulsification of spilled oils in wastewater. In this work, interfacially active Janus hollow glass microparticles (J-HGMPs) of asymmetric wettability were designed and synthesized in order to achieve more efficient separation of emulsified oil droplets from oily wastewater. Surface characteristic techniques such as FTIR, SEM, zeta potential and contact angle measurements had been employed to assess the amphiphilic surface properties of J-HGMPs. The oil removal/recovery performance of J-HGMPs in different oil–water systems and their interfacial activities were studied. As a particulate emulsifier, J-HGMPs could remove/recover > 96% oil from oil–water mixed phase. The results showed that J-HGMPs had strong interfacial activities and anchored firmly at oil/water interfaces. This high adsorption energy was also evaluated and verified via the calculation of Gibbs free energy. Overall, this study provided a novel and low-cost oil recovery method via a convenient buoyancy force that could be effectively applied in the treatment of oil spills while achieving the goal of benign and green environmental protection.

Enhanced electrocatalytic activity of POM-derived CoMoS/FCP heterostructures for overall water splitting in alkaline media

For the development of green energy and environmental protection, water splitting is an effective method to achieve high-efficiency H2 production as a clean and pollution-free energy source. However, the kinetics of the reaction are limited as a severe reaction. Thus, it is essential to find an economical and robust bifunctional electrocatalyst to boost the hydrogen evolution reaction (HER) and oxygen evolution reaction reactions (OER). In this work, we designed a bifunctional catalyst, CoMoS/FCP, by using the polyoxometalate (POM) Co2Mo10 as a precursor on carbon paper. The catalyst exhibits excellent performance under alkaline conditions (1 M KOH). The overpotential for the HER at 10 mA·cm−2 is 225 mV, and the overpotential of OER at 20 mA/cm2 is 215 mV. We also prepared an assembled two-electrode electrolyzer in alkaline condition. The electrolyzer has a quite low cell voltage of 1.67 V at a current density of 10 mA·cm−2. Moreover, even after 12 h of durability tests, the current density is only slight diminished. In addition, the electrolyzer operates stably under high current density (100 mA/cm2) at a cell voltage of 1.85 V. This work provides excellent potential for low energy consumption H2 production with the CoMoS/FCP catalyst.

HOW WILL RURAL HOUSES GO GREEN? EXPLORING INFLUENCING FACTORS OF VILLAGERS' PARTICIPATION IN GREEN HOUSING CONSTRUCTION IN RURAL COMMUNITIES

ABSTRACT Traditional rural houses are characterized by high energy consumption, low energy efficiency, waste of energy resources, and high carbon emissions, which are detrimental to China's energy consumption as well as to the environment. It is therefore important to promote green rural housing construction. However, rural villagers' low level of participation has led to a dearth of successfully implemented green rural housing projects, a situation that a lack of relevant research has no doubt contributed to. This paper therefore studies the factors influencing villagers' participation in green rural housing projects based on Bourdieu's theory of practice. A questionnaire-based survey was conducted in Yancheng, China, and descriptive analysis, analysis of variance and multivariate ordered logistic regression analysis were performed to understand the participation behavior of villagers and influencing factors of villagers' participation in green rural housing construction. Results indicate that participation of the surveyed villagers is generally not high, and most villagers participated superficially. No differences were detected in villagers' total participation in terms of gender, leisure time, housing type, government propaganda, government management, and government role orientation. Moreover, social network, social economy, construction cost, interest appeals, attention to current affairs, awareness of green environmental protection and total family population are found to affect villagers' total participation. The findings will help the government devise measures to encourage villagers to actively participate in the construction of green rural housing, and thereby realize the goal of low carbon sustainable development of rural communities.

An Empirical Study on the Impact of Green Credit on Financial Performance of China’s Listed Banks

Abstract The concept of green environmental protection and sustainability is deeply rooted in China. Green credit has become an important social issue in recent years. Most Chinese financial institutions are also actively participating and investing in this field, especially banks. In order to explore the correlation between banks' participation in green credit business and banks' financial performance, this paper collects the green credit balance, green credit ratio, return on total assets, non-performing loan ratio and other data of 16 major listed commercial banks in China from 2011 to 2019. At the same time, econometric modelling is built using the system GMM regression analysis method. This focuses on the impact of commercial banks' green credit business on their profitability. The final research results certify that banks' increasing investment in green credit has a positive impact on promoting profitability, both showed a positive correlation. Therefore, this paper suggests that banks should focus on the development of green credit business, which is beneficial to both the financial performance of banks and the construction of an environmentally sustainable society. JEL classification numbers: P34. Keywords: Green credit, Green credit, Bank financial performance.

Mechanical Characterization and Constitutive Modeling of Nano-Stabilized Soil under Uniaxial Compression

The stress-strain constitutive model under uniaxial compression is a basic element and important characterization method for determining physical and mechanical properties in cement-based materials research. In this study, a stress-strain constitutive model under uniaxial compression was established, which was based on a new nano-stabilized soil (NSS) through typical mechanical tests and constitutive relationship research. The results indicate that the unconfined compressive strength (UCS) of the nano-stabilized soil was enhanced with the increase in curing period and nano-stabilizer dosage, and that the strength growth rate reaches the maximum at a 12% dosage in the tested samples. The UCS of NSS under a 12% dosage is about 10~15% higher than that of ordinary stabilized soil (SS) without nano doping, and 25~40% higher compared with grade 42.5 cement-soil. The established constitutive model could accurately describe the linear-elastic and elastic-plastic deformation characteristics of NSS under uniaxial compression, which will be conducive to revealing the curve variation law of the stress-strain process. The research results could provide scientific support for the theoretical innovation and engineering application of green environmental protection materials.

Study on Proportion Optimization of Magnesium Oxychloride Cement-Stabilized Clayey Soil Based on the Response Surface Methodology

The energy-saving and green environmental protection magnesium oxychloride cement (MOC) is introduced into the pavement base and subbase to improve the shortcomings of CO2 emissions and high industrial energy consumption in the production process of traditional cementitious materials such as lime and Portland cement. Box−Behnken design of design-expert is employed for experiment arrangement, in which MgO/MgCl2 molar ratio, MOC content, and fly ash content are influencing factors, while response values are 7d unconfined compressive strength (USC) and 1d softening coefficient (SC) of solidified soil. The response surface methodology (RSM) is used to optimize the ratio of three additives, and the effects of various factors on the response value are investigated by response surface model analysis and interaction analysis. The results show that the MOC content has the most excellent effect on 7d unconfined compressive strength, and the mutual influence for the MOC content and fly ash content are significant, respectively. However, the influential factor is the fly ash content for the 1d softening coefficient. It is predicted by the RSM analysis that the optimum balance of USC and SC is 8.61 for the MgO/MgCl2 molar ratio, 18% for the MOC content, and 20.36% for the fly ash content. With the additives in the optimal ratio, the actual unconfined compressive strength and softening coefficient of stabilized soil are 2.56 MPa and 0.76, respectively. It is confirmed that the response surface methodology plays an important part in optimizing the proportion of MOC-stabilized clayey soil.

Core-shell structured MnxCoyO4 @MoS2 composites for advanced electrodes in supercapacitors

Supercapacitors are promising environmentally friendly energy storage devices owing to their high-power density, fast charge and discharge rates, long service life, wide applicable temperature range, and green environmental protection. Electrodes largely determine superconductor performance, so it is crucial to develop electrode materials with excellent performance. In this work, MnxCoyO4 @MoS2 composites were obtained by coating flake MoS2 arrays on spherical MnxCoyO4 using hydrothermal and heat treatment methods. At x/y = 1:2, the MnxCoyO4 @MoS2 electrode material exhibited a specific capacitance of 1422 F g−1 at 1 A g−1, which was higher than that at x/y = 1:1 and 2:1. When assembled into an aqueous asymmetric supercapacitor, the proposed electrode material provided a specific capacitance of 131 F g−1 at 1 A g−1. The promising cycle life of the electrode material was further illustrated by the fact that capacity retention of 85% was obtained after 5000 cycles, and the device retained a specific power of 794 W kg−1 with 46.58 Wh kg−1. The proposed electrode material design, therefore, provides new ideas to be used in the development of advanced electrodes.

The dynamic relationship between green tax incentives and environmental protection.

The purpose of this study is to examine the impact of green tax incentives such as investment tax credit and taxable income deductions related to the environmental sustainability and climate change which are becoming more popular in developing countries, whereas introducing green tax incentives related to the environment and climate change helps and meets the sustainability objectives of growth and development. For this purpose, we selected the top 100 listed companies on the Swedish stock market (SSM), Nasdaq Stockholm (SN), in order to better understand the real facts and figures of green tax environment. This study uses a longitudinal research design because sample observations vary across firms and over a short time and conducts probit and logistic regression to identify the beneficiaries of the tax incentives. The findings show that different firm-level characteristics significantly impact the probability of being an ITC beneficiary.