During the 2025 Beijing Digital Economy Experience Week from 27 June to 5 July,interactive projects combining technology and culture-illustrated books created by voice AI,augmented reality tours,and markerless motion ...During the 2025 Beijing Digital Economy Experience Week from 27 June to 5 July,interactive projects combining technology and culture-illustrated books created by voice AI,augmented reality tours,and markerless motion capture-attracted many visitors.“More than a dozen themed areas offered the opportunity to dive into new worlds and discover the latest innovations from more than 50 companies,”Lu Yumin,a Beijing resident who visited the event,told ChinAfrica.展开更多
Based on the CiteSpace visualization knowledge graph,this article conducts a visual analysis of the evolution of publication volume,distribution of national institutions,keyword clustering,and other related literature...Based on the CiteSpace visualization knowledge graph,this article conducts a visual analysis of the evolution of publication volume,distribution of national institutions,keyword clustering,and other related literature on aging friendly bathroom facilities in 502 Chinese and English articles,in order to analyze the research status,hotspots,and future research directions in this field.Through analysis,it was found that research in this field is showing an increasing trend,but there is still a need for relevant experts to actively engage in cross institutional,cross disciplinary,and cross national exchanges and cooperation.Emerging concepts such as smart homes and informatization have become new research hotspots.Moreover,research trend has shifted from macro level discussions to specific optimizations,and has shown characteristics of disciplinary integration and technology driven development.Overall,this study has identified the development direction for improving the level of technological application,emphasizing the importance of interdisciplinary and international cooperation,and providing certain guidance for the construction of a research system for aging friendly bathroom facilities.展开更多
As "PFC Free" becomes a standard feature for more and more outdoor brands,environmental protection is no longer a distant slogan,but has become a necessary choice in consumer decision-making.When labels‘PFC...As "PFC Free" becomes a standard feature for more and more outdoor brands,environmental protection is no longer a distant slogan,but has become a necessary choice in consumer decision-making.When labels‘PFC free’are attached to products,we cannot help but ask:Where will the next environmental revolution occur?展开更多
Accurate assessment of blast furnace conditions is a crucial component in the blast furnace control decision-making process.However,most adversarial models in the field currently update the parameters of the label pre...Accurate assessment of blast furnace conditions is a crucial component in the blast furnace control decision-making process.However,most adversarial models in the field currently update the parameters of the label predictor by minimising the objective function while maximising the objective function to update the domain discriminator's parameters.This strategy results in an excessive maximisation of the domain discriminator's loss.To address this,a friendly adversarial training-based tri-training furnace condition diagnosis model was proposed.This model employed a convolutional neural network-long short-term memory-attention mechanism network as a single-view feature extractor and used decision tree methods as three classifiers to compute the cosine similarity between features and representative vectors of each class.During the knowledge transfer process,the classifiers in this model have a specific goal;they not only seek to maximise the entropy of the target domain samples but also aim to minimise the entropy of the target domain samples when they are misclassified,thus resolving the trade-off in traditional models where robustness is improved at the expense of accuracy.Experimental results indicate that the diagnostic accuracy of this model reaches 96%,with an approximately 8%improvement over existing methods due to the inner optimisation approach.This model provides an effective and feasible solution for the efficient monitoring and diagnosis of blast furnace processes.展开更多
In the vast hinterland of the Qinghai-Xizang Plateau in western China,a profound green transformation is advancing quietly.On the vast Gobi Desert,arrays of solar panels resemble a shimmering silver sea.White wind tur...In the vast hinterland of the Qinghai-Xizang Plateau in western China,a profound green transformation is advancing quietly.On the vast Gobi Desert,arrays of solar panels resemble a shimmering silver sea.White wind turbines stand tall against the sky,with their blades swirling slowly in the wind.Golmud,a city in west China’s Qinghai Province formerly known for its abundant natural resources.展开更多
From globally popular video game Black Myth:Wukong,which has garnered a dedicated player base around the world,to DeepSeek,an artificial intelligence(AI)model developed at an impressively low cost that rivals U.S.comp...From globally popular video game Black Myth:Wukong,which has garnered a dedicated player base around the world,to DeepSeek,an artificial intelligence(AI)model developed at an impressively low cost that rivals U.S.company OpenAI’s ChatGPT,and the perfectly synchronized robotic ensemble performing with precision at this year’s China Central Television Spring Festival Gala,a Chinese New Year’s Eve extravaganza that aired on January 28-these big tech breakthroughs have risen to prominence one after another,generating massive buzz.展开更多
In this research,the antibacterial properties of a composite material prepared from agave bagasse cellulose fibers doped with silver nanoparticles and chitosan were studied.The development of composite materials with ...In this research,the antibacterial properties of a composite material prepared from agave bagasse cellulose fibers doped with silver nanoparticles and chitosan were studied.The development of composite materials with antibacterial properties and environmentally friendly based on cellulose fibers from agave bagasse with silver nanoparticles prepared by green synthesis and chitosan from shrimp waste enhances the value of these agro-industrial wastes and offers the opportunity for them to have biomedical applications since these raw materials have been poorly reported for this application.The antibacterial properties of chitosan and silver nanoparticles are already known.However,the combination of silver nanoparticles with cellulose fibers and chitosan has been studied poorly.Green synthesis of silver nanoparticles was carried out,and spherical shape nanoparticles with a size between 20 and 50 nm were obtained by ultraviolet-visible(UV-Vis)spectroscopy and transmission electron microscopy(TEM)analysis.Additionally,in this research,the cellulose obtained from agave bagasse,the chitosan extracted from shrimp shells,and the composite material were characterized by infrared spectroscopy,mechanical analysis,and antibacterial tests.A decrease in the growth of Escherichia coli bacteria with 100%growth inhibition on cellulose,chitosan,and silver nanoparticles composite material and an increase in mechanical properties from 13.67 MPa of cellulose pure to 110 MPa of composite material was observed.These findings support the idea that the composite material has potential use in wound care dressings for antibacterial care.展开更多
A kind of environmental friendly anodizing routine for AZ91D magnesium alloy,based on an alkaline borate-potassium acid phthalate（KAP） electrolyte,was studied.The effect of KAP on the properties of the anodized film...A kind of environmental friendly anodizing routine for AZ91D magnesium alloy,based on an alkaline borate-potassium acid phthalate（KAP） electrolyte,was studied.The effect of KAP on the properties of the anodized film was investigated by scanning electron microscopy（SEM）,X-ray diffraction（XRD）,energy dispersive spectrometry（EDS）,potentiodynamic polarization and electrochemical impedance spectroscopy（EIS）,respectively.The results showed that the anodizing process,surface morphology,thickness,phase structure and corrosion resistance of the anodized film were strongly dependent on the concentration of KAP.In the presence of adequate KAP,a compact and smooth anodized film with excellent corrosion resistance was obtained.展开更多
The control of carbon emissions and energy conservation,and environmental protection are hot spots of global concern.In this paper,phase change paraffin wax is applied to porous materials for adsorption and storage,an...The control of carbon emissions and energy conservation,and environmental protection are hot spots of global concern.In this paper,phase change paraffin wax is applied to porous materials for adsorption and storage,and nature’s eco-friendly materials are selected as the porous matrix to propose an eco-friendly phase change concrete using eco-friendly materials as raw materials.It was obtained that the strength of the phase change concrete utilizing environmentally friendly materials was 25.4%to 36.8%lower than that of ordinary concrete,while some of the phase change light aggregates were found to produce slip damage with the cement paste in the damage study.By constructing a small-sized test room for thermal properties,we obtained a phase change concrete that utilizes environmentally friendly materials to control the temperature better than the commonly studied phase change concrete,with a peak temperature drop of up to 2.6℃ in the phase change test room compared to the normal test room and a delay in the peak temperature.展开更多
在The American Heritage Dictionary of the English Language的第4版中,我们可以发现friendly一词有一新的义项:4a.User-friendly.b.Informal Easy to understand or use for a specified agent.Often used in combination:a reader-f...在The American Heritage Dictionary of the English Language的第4版中,我们可以发现friendly一词有一新的义项:4a.User-friendly.b.Informal Easy to understand or use for a specified agent.Often used in combination:a reader-friendly novel;a consumerfriendly policy.展开更多
The demand for non-toxic and biodegradable shale inhibitors is growing in the drilling industry.In this paper,the effect of notoginsenoside(NS)as a new,environmentally friendly inhibitor of shale hydration is systemat...The demand for non-toxic and biodegradable shale inhibitors is growing in the drilling industry.In this paper,the effect of notoginsenoside(NS)as a new,environmentally friendly inhibitor of shale hydration is systematically studied for the first time.The inhibition performance of NS was evaluated via inhibition evaluation tests,including mud ball immersion tests,linear expansion tests,shale rolling recovery tests,and compressive strength tests.The inhibition mechanism of NS was analyzed using Fourier transform infrared spectroscopy(FTIR),contact angle measurements,particle size distribution determination,thermogravimetric analysis(TGA),and scanning electron microscopy(SEM).The experimental results demonstrate that NS is able to adhere to the clay surface,forming a hydrophobic film that prevents the entry of water molecules and inhibiting the hydration dispersion of the clay.Because of this,NS can maintain the original state of bentonite pellets in water,which can effectively reduce the swelling rate of bentonite,increase the recovery rate of shale drill cuttings,maintain the strength of the shale,and therefore maintain the stability of the borehole wall during drilling.In addition,NS is non-toxic,degradable,and compatible with water-based drilling fluids.The above advantages make NS a promising candidate for use as an environmentally friendly shale inhibitor.展开更多
Designing and fabricating the marine anti-corrosion materials without fluorine by superhydrophobic method is a huge challenge. In this study, an environmentally friendly composite coating was prepared by combing modif...Designing and fabricating the marine anti-corrosion materials without fluorine by superhydrophobic method is a huge challenge. In this study, an environmentally friendly composite coating was prepared by combing modified expanded graphite(EAG) with nano zinc oxide(ZnO). This coating showed superhydrophobic surface and good corrosion resistance. Fourier transform infrared spectroscopy(FITR), X-ray diffraction(XRD),and scanning electron microscopy(SEM) were used to characterize the materials in fabricating process of the coating. The properties of three composite coatings(ZnO,EAG, and EAG@ZnO) were analyzed, including surface roughness, water contact angle, corrosion resistance, selfcleaning and anti-fouling. The combination of ZnO and EAG caused a big water contact angle, leading superhydrophobic surface of the composite coatings. The electrochemical results showed that the superhydrophobic EAG@ZnO coating had a larger capacitive arc diameter and charge transfer resistance, indicating the enhanced anti-corrosion resistance. Meanwhile, the EAG@ZnO coating also showed good self-cleaning and anti-fouling performance according to solid and liquid pollutants tests.In addition, the mechanical properties and stability of the superhydrophobic EAG@ZnO coatings were evaluated by knife peeling and finger scratch tests. In summary, these superhydrophobic and anti-fouling EAG@ZnO composite coatings provide a potential application in marine corrosion and protection field.展开更多
A series of acetate ionic liquids were synthesized using a typical two‐step method.The ionic liquids were used as environmentally benign catalysts in the production of propylene glycol ethers from propylene oxide and...A series of acetate ionic liquids were synthesized using a typical two‐step method.The ionic liquids were used as environmentally benign catalysts in the production of propylene glycol ethers from propylene oxide and alcohols under mild conditions.The basic strengths of the ionic liquids were evaluated by determination of their Hammett functions,obtained using ultraviolet‐visible spectroscopy,and the relationship between their catalytic activities and basicities was established.The catalytic efficiencies of the ionic liquids were higher than that of the traditional basic catalyst NaOH.This can be attributed to the involvement of a novel reaction mechanism when these ionic liquids are used.A possible electrophilic‐nucleophilic dual activation mechanism was proposed and confirmed using electrospray ionization quadrupole time‐of‐flight mass spectrometry.In addition,the effects of significant reaction parameters such as concentration of catalyst,molar ratio of alcohol to propylene oxide,reaction temperature,and steric hindrance of the alcohol were investigated in detail.展开更多
The plasticizer is an important polymer material additive.Non-toxic and environmentally friendly plasticizers are developed recently in order to decrease fossil fuel reserves,serious environmental pollution and the to...The plasticizer is an important polymer material additive.Non-toxic and environmentally friendly plasticizers are developed recently in order to decrease fossil fuel reserves,serious environmental pollution and the toxicity of phthalate esters.In this study,a new,efficient and environmentally friendly plasticizer of hydrogenated rosin dodecyl ester was prepared by an esterification reaction of hydrogenated rosin and dodecanol.The influences of different reaction conditions(including different catalysts,the catalyst concentration,the ratio of the reactants,reaction temperature,and reaction time)on the esterification yield are examined and discussed.Hydrogenated rosin dodecyl ester with 71.8%yield was synthesized under the optimized reaction conditions(1:0.8 molar ratio of rosin to dodecanol,1 mol%tetrabutyl titanate concentration,and 210℃for 6 h).The esterification reaction is a second-order reaction,and kinetic calculations showed that the activation energy is 39.77 KJ·mol^(−1).The structure of the hydrogenated rosin dodecyl ester was confirmed by FT-IR spectroscopy and^(13)C NMR spectrum.Besides,the thermal stability of target product(hydrogenated rosin dodecyl ester)was also tested by thermal gravimetric analysis(TGA),which showed a good thermal stability.展开更多
An anodizing process, based on environmental friendly electrolyte solutions has been studied on AZ 91 magnesium alloys by using three types of electrolytes: the first is based on sodium silicate, the second on sodium ...An anodizing process, based on environmental friendly electrolyte solutions has been studied on AZ 91 magnesium alloys by using three types of electrolytes: the first is based on sodium silicate, the second on sodium hydroxide-boric acid-borax and the third on sodium silicate- potassium hydroxide-sodium carbonate-sodium tetra borate. A pretreatment including fluoride activation was applied before the anodizing process. It was found that the anodic film thickness increases as current density or anodizing voltage increases. It is also increased with deposition time until the deposition stops due to the formation of a thick anodic film. Optimization of the anodizing conditions - current density and deposition time- was made for each electrolyte. Characterization of anodizing layer was achieved by determination of surface morphology, microstructure, phase analysis, coat thickness, adhesion and corrosion resistance. In all cases, excellent adhesion and corrosion resistance was obtained. A corrosion efficiency ranging from 94% to 97% was reached;the highest value corresponding to the third electrolyte.展开更多
Objective:This study aims to examine the effects of a community-based friendly health clinic(CFHC)program that adopts manual participatory learning(MPL)intervention on the adolescents living in the rural and urban are...Objective:This study aims to examine the effects of a community-based friendly health clinic(CFHC)program that adopts manual participatory learning(MPL)intervention on the adolescents living in the rural and urban areas of Indonesia to gain further insights into their knowledge,attitudes,and skills related to adolescent reproductive health(ARH).Methods:A quasi-experimental design was used to obtain information on the ARH knowledge,attitudes,and skills of adolescents.Two intervention studies that used similar protocols and measures were conducted.A total of 192 adolescents(96 adolescents from urban and rural areas)participated in the project,and the participants from each area were divided into eight groups.A questionairre was adopted to measure the ARH knowledge,attitudes,and skills of these participants.A content analysis of the logbook entries of these respondents was conducted to identify their ARH-related problems.The questionnairre and self-reported ARH data were collected before and after the eight-week program.Results:The CFHC program significantly increased the ARH attitudes(p=0.045)and skills(p=0.009)of adolescents in the rural area,but only improved the ARH knowledge(p<0.001)of adolescents in both rural and urban areas.Fourteen themes were identified in three dominant categories,namely,schools,families,and communities.Conclusions:The CFHC with MPL intervention can improve the ARH knowledge,attitudes,and skills of adolescents in the rural area,but can only improve the ARH knowledge of adolescents in the urban area.The ARH program must be designed based on the characterictics of these adolescents to improve their life skills during puberty.展开更多
There is an increasing concern about agriculture’s role in polluting the environment which makes farmers feel guilty about using fertilizers. Fertigation is proposed as a panacea to this dilemma, which by this practi...There is an increasing concern about agriculture’s role in polluting the environment which makes farmers feel guilty about using fertilizers. Fertigation is proposed as a panacea to this dilemma, which by this practice reaffirms the principles of 4Rs which are the right source, at the right rate, right time and right place. The aim of this study was to explore constraints and opportunities for its application in developing countries for environmentally friendly fertilizers application. It is a review of literature from government reports, legislature and published material on fertilization and irrigation initiatives of developing countries which include Rwanda, Nepal, Suriname, Zambia, Panama, Tanzania, Sri Lanka and South Sudan in addition to the case presented of China during the “2016 Environmentally Friendly Fertilizer Production, Application and Demonstration from Developing Countries” training course. The study found that in developing countries there is potential to apply fertigation as a way of environmentally friendly fertilizers application as it has been adopted in China. These opportunities include the following: Abundant natural resources like land and water, less polluted environment, conducive agricultural policies, zero duties levied on imported irrigation equipment. However, a number of limitations also are highlighted including: Lack of investment, lack of infrastructure, lack of information, requires expertise on plant nutrition and management of fertigation system, require soil analysis and proper interpretation which is done by experts. This study provides relevant information for fertigation planning and application in respective developing countries.展开更多
Sizing treatment has shown great potential in improving the interfacial properties of poly(p-phenylene benzodioxazole)(PBO)fiber-reinforced composites,but is severely limited due to the use of flammable and explosive ...Sizing treatment has shown great potential in improving the interfacial properties of poly(p-phenylene benzodioxazole)(PBO)fiber-reinforced composites,but is severely limited due to the use of flammable and explosive organic solvents.Herein,a new high-efficiency waterborne sizing agent has been developed by using functionalized carbon nanospheres(CNSs)as a nano-reinforcement.Due to abundant oxygen-containing groups,the CNSs greatly improves the surface activity,wettability,and roughness of the PBO fibers.As a result,the interfacial shear strength of the CNSs sized fiber-reinforced composite increases by 79.6%compared with that of the pristine fiber-reinforced composite.Moreover,the excellent mechanical and thermal properties of the PBO fibers remain almost unchanged after sizing treatment.Thus,this work provides an environmentally friendly and scalable method for constructing a strong interface between the PBO fibers and the matrix resins,which makes sense in promoting the application of PBO fiber-reinforced composites in aerospace and military industries.展开更多
With the exploration and development of deep and ultra-deep oil and gas,high torque and high friction during the drilling of deep and ultra-deep wells become one of the key issues affecting drilling safety and drillin...With the exploration and development of deep and ultra-deep oil and gas,high torque and high friction during the drilling of deep and ultra-deep wells become one of the key issues affecting drilling safety and drilling speed.Meanwhile,the high temperature and high salt problem in deep formations is prominent,which poses a major challenge to the lubricity of drilling fluids under high temperature and high salt.This paper reports an organic borate ester SOP as an environmentally friendly drilling fluid lubricant.The performance evaluation results show that when 1%lubricant SOP is added to the fresh water-based mud,the lubrication coefficient decreases from 0.631 to 0.046,and the reduction rate of lubrication coefficient is 92.7%.Under the conditions of 210℃ and 30%NaCl,the reduction rate of lubricating coefficient of the base slurry with 1%SOP was still remain 81.5%.After adding 1%SOP,the wear volume decreased by 94.11%compared with the base slurry.The contact resistance experiment during the friction process shows that SOP can form a thick adsorption film on the friction surface under high temperature and high salt conditions,thus effectively reducing the friction resistance.Molecular dynamics simulation shows that lubricant SOP can be physically adsorbed on the surface of drilling tool and borehole wall through hydrogen bond and van der Waals force.XPS analysis further shows that SOP adsorbs on the friction surface and reacts with metal atoms on the friction surface to form a chemically reactive film.Therefore,under high temperature and high salt conditions,the synergistic effect of physical adsorption film and chemical reaction film effectively reduces the frictional resistance and wear of the friction surface.In addition,SOP is non-toxic and easy to degrade.Therefore,SOP is a highly effective and environmentally friendly lubricant in high temperature and high salt drilling fluid.展开更多
文摘During the 2025 Beijing Digital Economy Experience Week from 27 June to 5 July,interactive projects combining technology and culture-illustrated books created by voice AI,augmented reality tours,and markerless motion capture-attracted many visitors.“More than a dozen themed areas offered the opportunity to dive into new worlds and discover the latest innovations from more than 50 companies,”Lu Yumin,a Beijing resident who visited the event,told ChinAfrica.
文摘Based on the CiteSpace visualization knowledge graph,this article conducts a visual analysis of the evolution of publication volume,distribution of national institutions,keyword clustering,and other related literature on aging friendly bathroom facilities in 502 Chinese and English articles,in order to analyze the research status,hotspots,and future research directions in this field.Through analysis,it was found that research in this field is showing an increasing trend,but there is still a need for relevant experts to actively engage in cross institutional,cross disciplinary,and cross national exchanges and cooperation.Emerging concepts such as smart homes and informatization have become new research hotspots.Moreover,research trend has shifted from macro level discussions to specific optimizations,and has shown characteristics of disciplinary integration and technology driven development.Overall,this study has identified the development direction for improving the level of technological application,emphasizing the importance of interdisciplinary and international cooperation,and providing certain guidance for the construction of a research system for aging friendly bathroom facilities.
文摘As "PFC Free" becomes a standard feature for more and more outdoor brands,environmental protection is no longer a distant slogan,but has become a necessary choice in consumer decision-making.When labels‘PFC free’are attached to products,we cannot help but ask:Where will the next environmental revolution occur?
基金Thanks are given to Hebei Province Innovation Capacity Enhancement Programme Project(23560301D)the Natural Science Foundation of Hebei Province(E2024105036)the Tangshan Talent Funding Project(B202302007).
文摘Accurate assessment of blast furnace conditions is a crucial component in the blast furnace control decision-making process.However,most adversarial models in the field currently update the parameters of the label predictor by minimising the objective function while maximising the objective function to update the domain discriminator's parameters.This strategy results in an excessive maximisation of the domain discriminator's loss.To address this,a friendly adversarial training-based tri-training furnace condition diagnosis model was proposed.This model employed a convolutional neural network-long short-term memory-attention mechanism network as a single-view feature extractor and used decision tree methods as three classifiers to compute the cosine similarity between features and representative vectors of each class.During the knowledge transfer process,the classifiers in this model have a specific goal;they not only seek to maximise the entropy of the target domain samples but also aim to minimise the entropy of the target domain samples when they are misclassified,thus resolving the trade-off in traditional models where robustness is improved at the expense of accuracy.Experimental results indicate that the diagnostic accuracy of this model reaches 96%,with an approximately 8%improvement over existing methods due to the inner optimisation approach.This model provides an effective and feasible solution for the efficient monitoring and diagnosis of blast furnace processes.
文摘In the vast hinterland of the Qinghai-Xizang Plateau in western China,a profound green transformation is advancing quietly.On the vast Gobi Desert,arrays of solar panels resemble a shimmering silver sea.White wind turbines stand tall against the sky,with their blades swirling slowly in the wind.Golmud,a city in west China’s Qinghai Province formerly known for its abundant natural resources.
文摘From globally popular video game Black Myth:Wukong,which has garnered a dedicated player base around the world,to DeepSeek,an artificial intelligence(AI)model developed at an impressively low cost that rivals U.S.company OpenAI’s ChatGPT,and the perfectly synchronized robotic ensemble performing with precision at this year’s China Central Television Spring Festival Gala,a Chinese New Year’s Eve extravaganza that aired on January 28-these big tech breakthroughs have risen to prominence one after another,generating massive buzz.
文摘In this research,the antibacterial properties of a composite material prepared from agave bagasse cellulose fibers doped with silver nanoparticles and chitosan were studied.The development of composite materials with antibacterial properties and environmentally friendly based on cellulose fibers from agave bagasse with silver nanoparticles prepared by green synthesis and chitosan from shrimp waste enhances the value of these agro-industrial wastes and offers the opportunity for them to have biomedical applications since these raw materials have been poorly reported for this application.The antibacterial properties of chitosan and silver nanoparticles are already known.However,the combination of silver nanoparticles with cellulose fibers and chitosan has been studied poorly.Green synthesis of silver nanoparticles was carried out,and spherical shape nanoparticles with a size between 20 and 50 nm were obtained by ultraviolet-visible(UV-Vis)spectroscopy and transmission electron microscopy(TEM)analysis.Additionally,in this research,the cellulose obtained from agave bagasse,the chitosan extracted from shrimp shells,and the composite material were characterized by infrared spectroscopy,mechanical analysis,and antibacterial tests.A decrease in the growth of Escherichia coli bacteria with 100%growth inhibition on cellulose,chitosan,and silver nanoparticles composite material and an increase in mechanical properties from 13.67 MPa of cellulose pure to 110 MPa of composite material was observed.These findings support the idea that the composite material has potential use in wound care dressings for antibacterial care.
基金Projects (50771092,21073162) supported by the National Natural Science Foundation of ChinaProject (08JC1421600) supported by the Science and Technology Commission of Shanghai,ChinaProject (2008AZ2018) supported by the Science and Technology Bureau of Jiaxing,China
文摘A kind of environmental friendly anodizing routine for AZ91D magnesium alloy,based on an alkaline borate-potassium acid phthalate（KAP） electrolyte,was studied.The effect of KAP on the properties of the anodized film was investigated by scanning electron microscopy（SEM）,X-ray diffraction（XRD）,energy dispersive spectrometry（EDS）,potentiodynamic polarization and electrochemical impedance spectroscopy（EIS）,respectively.The results showed that the anodizing process,surface morphology,thickness,phase structure and corrosion resistance of the anodized film were strongly dependent on the concentration of KAP.In the presence of adequate KAP,a compact and smooth anodized film with excellent corrosion resistance was obtained.
基金Thanks to the Shandong Science and Technology Development Project(2013YD02043)and Shandong University of Science and Technology Science and Technology Innovation Program for their support.
文摘The control of carbon emissions and energy conservation,and environmental protection are hot spots of global concern.In this paper,phase change paraffin wax is applied to porous materials for adsorption and storage,and nature’s eco-friendly materials are selected as the porous matrix to propose an eco-friendly phase change concrete using eco-friendly materials as raw materials.It was obtained that the strength of the phase change concrete utilizing environmentally friendly materials was 25.4%to 36.8%lower than that of ordinary concrete,while some of the phase change light aggregates were found to produce slip damage with the cement paste in the damage study.By constructing a small-sized test room for thermal properties,we obtained a phase change concrete that utilizes environmentally friendly materials to control the temperature better than the commonly studied phase change concrete,with a peak temperature drop of up to 2.6℃ in the phase change test room compared to the normal test room and a delay in the peak temperature.
文摘在The American Heritage Dictionary of the English Language的第4版中,我们可以发现friendly一词有一新的义项:4a.User-friendly.b.Informal Easy to understand or use for a specified agent.Often used in combination:a reader-friendly novel;a consumerfriendly policy.
基金financially supported by the National Natural Science Foundation of China(Grants 51904328)the Natural Science Foundation of China(Grants 52074330)
文摘The demand for non-toxic and biodegradable shale inhibitors is growing in the drilling industry.In this paper,the effect of notoginsenoside(NS)as a new,environmentally friendly inhibitor of shale hydration is systematically studied for the first time.The inhibition performance of NS was evaluated via inhibition evaluation tests,including mud ball immersion tests,linear expansion tests,shale rolling recovery tests,and compressive strength tests.The inhibition mechanism of NS was analyzed using Fourier transform infrared spectroscopy(FTIR),contact angle measurements,particle size distribution determination,thermogravimetric analysis(TGA),and scanning electron microscopy(SEM).The experimental results demonstrate that NS is able to adhere to the clay surface,forming a hydrophobic film that prevents the entry of water molecules and inhibiting the hydration dispersion of the clay.Because of this,NS can maintain the original state of bentonite pellets in water,which can effectively reduce the swelling rate of bentonite,increase the recovery rate of shale drill cuttings,maintain the strength of the shale,and therefore maintain the stability of the borehole wall during drilling.In addition,NS is non-toxic,degradable,and compatible with water-based drilling fluids.The above advantages make NS a promising candidate for use as an environmentally friendly shale inhibitor.
基金financially supported by Hainan Province Science and Technology Special Fund (No. ZDYF2021GXJS210)Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City (No. 2021CXLH0005)+2 种基金Wenhai Program of the S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (No. 2021WHZZB2301)Overseas Science and Education Centers of Bureau of International Cooperation Chinese Academy of Sciences (No. 121311KYSB20210005)Hainan Institute for Chinese Development Strategy of Engineering & Technology (No. 22-HN-XZ-02) and for providing support。
文摘Designing and fabricating the marine anti-corrosion materials without fluorine by superhydrophobic method is a huge challenge. In this study, an environmentally friendly composite coating was prepared by combing modified expanded graphite(EAG) with nano zinc oxide(ZnO). This coating showed superhydrophobic surface and good corrosion resistance. Fourier transform infrared spectroscopy(FITR), X-ray diffraction(XRD),and scanning electron microscopy(SEM) were used to characterize the materials in fabricating process of the coating. The properties of three composite coatings(ZnO,EAG, and EAG@ZnO) were analyzed, including surface roughness, water contact angle, corrosion resistance, selfcleaning and anti-fouling. The combination of ZnO and EAG caused a big water contact angle, leading superhydrophobic surface of the composite coatings. The electrochemical results showed that the superhydrophobic EAG@ZnO coating had a larger capacitive arc diameter and charge transfer resistance, indicating the enhanced anti-corrosion resistance. Meanwhile, the EAG@ZnO coating also showed good self-cleaning and anti-fouling performance according to solid and liquid pollutants tests.In addition, the mechanical properties and stability of the superhydrophobic EAG@ZnO coatings were evaluated by knife peeling and finger scratch tests. In summary, these superhydrophobic and anti-fouling EAG@ZnO composite coatings provide a potential application in marine corrosion and protection field.
基金supported by the One Hundred Talent Program of CASthe National Natural Science Foundation of China Petroleum & Chemical Corporation Joint Fund(U1662129)+1 种基金the National Natural Science Foundation of China(91434203)the Key Research Program of Frontier Sciences,Chinese Academy of Sciences(QYZDY-SSW-JSC011)~~
文摘A series of acetate ionic liquids were synthesized using a typical two‐step method.The ionic liquids were used as environmentally benign catalysts in the production of propylene glycol ethers from propylene oxide and alcohols under mild conditions.The basic strengths of the ionic liquids were evaluated by determination of their Hammett functions,obtained using ultraviolet‐visible spectroscopy,and the relationship between their catalytic activities and basicities was established.The catalytic efficiencies of the ionic liquids were higher than that of the traditional basic catalyst NaOH.This can be attributed to the involvement of a novel reaction mechanism when these ionic liquids are used.A possible electrophilic‐nucleophilic dual activation mechanism was proposed and confirmed using electrospray ionization quadrupole time‐of‐flight mass spectrometry.In addition,the effects of significant reaction parameters such as concentration of catalyst,molar ratio of alcohol to propylene oxide,reaction temperature,and steric hindrance of the alcohol were investigated in detail.
基金the financial support From the Open Fund Project of Key Lab.of Biomass Energy and Material,Jiangsu Province(JSBEM201907)the Ordinary University Young Innovative Talents Project of Guangdong Province(2018KQNCX119)+4 种基金Provincial Science and Technology Planning Projects of Guangdong Province(2017A040405055)Guangdong-Hong Kong Cooperation Project(2017A050506055)Guangdong Provincial Education Department Project(Natural Science,2017KZDXM045)Guangzhou major special project for collaborative innovation of industry,University and research(201604020074)the fund project of Yele Science and Technology Innovation(YL201807).
文摘The plasticizer is an important polymer material additive.Non-toxic and environmentally friendly plasticizers are developed recently in order to decrease fossil fuel reserves,serious environmental pollution and the toxicity of phthalate esters.In this study,a new,efficient and environmentally friendly plasticizer of hydrogenated rosin dodecyl ester was prepared by an esterification reaction of hydrogenated rosin and dodecanol.The influences of different reaction conditions(including different catalysts,the catalyst concentration,the ratio of the reactants,reaction temperature,and reaction time)on the esterification yield are examined and discussed.Hydrogenated rosin dodecyl ester with 71.8%yield was synthesized under the optimized reaction conditions(1:0.8 molar ratio of rosin to dodecanol,1 mol%tetrabutyl titanate concentration,and 210℃for 6 h).The esterification reaction is a second-order reaction,and kinetic calculations showed that the activation energy is 39.77 KJ·mol^(−1).The structure of the hydrogenated rosin dodecyl ester was confirmed by FT-IR spectroscopy and^(13)C NMR spectrum.Besides,the thermal stability of target product(hydrogenated rosin dodecyl ester)was also tested by thermal gravimetric analysis(TGA),which showed a good thermal stability.
文摘An anodizing process, based on environmental friendly electrolyte solutions has been studied on AZ 91 magnesium alloys by using three types of electrolytes: the first is based on sodium silicate, the second on sodium hydroxide-boric acid-borax and the third on sodium silicate- potassium hydroxide-sodium carbonate-sodium tetra borate. A pretreatment including fluoride activation was applied before the anodizing process. It was found that the anodic film thickness increases as current density or anodizing voltage increases. It is also increased with deposition time until the deposition stops due to the formation of a thick anodic film. Optimization of the anodizing conditions - current density and deposition time- was made for each electrolyte. Characterization of anodizing layer was achieved by determination of surface morphology, microstructure, phase analysis, coat thickness, adhesion and corrosion resistance. In all cases, excellent adhesion and corrosion resistance was obtained. A corrosion efficiency ranging from 94% to 97% was reached;the highest value corresponding to the third electrolyte.
基金The author(s)would like to thank the grant is provided by the Ministry of Research,Technology,and Higher Education,Directorate General of Resources for Research,Technology and Higher Education of Indonesia for providing this research,School of Nursing,University of Jember,and Research Center Department(Lembaga Penelitian)of University of Jember.
文摘Objective:This study aims to examine the effects of a community-based friendly health clinic(CFHC)program that adopts manual participatory learning(MPL)intervention on the adolescents living in the rural and urban areas of Indonesia to gain further insights into their knowledge,attitudes,and skills related to adolescent reproductive health(ARH).Methods:A quasi-experimental design was used to obtain information on the ARH knowledge,attitudes,and skills of adolescents.Two intervention studies that used similar protocols and measures were conducted.A total of 192 adolescents(96 adolescents from urban and rural areas)participated in the project,and the participants from each area were divided into eight groups.A questionairre was adopted to measure the ARH knowledge,attitudes,and skills of these participants.A content analysis of the logbook entries of these respondents was conducted to identify their ARH-related problems.The questionnairre and self-reported ARH data were collected before and after the eight-week program.Results:The CFHC program significantly increased the ARH attitudes(p=0.045)and skills(p=0.009)of adolescents in the rural area,but only improved the ARH knowledge(p<0.001)of adolescents in both rural and urban areas.Fourteen themes were identified in three dominant categories,namely,schools,families,and communities.Conclusions:The CFHC with MPL intervention can improve the ARH knowledge,attitudes,and skills of adolescents in the rural area,but can only improve the ARH knowledge of adolescents in the urban area.The ARH program must be designed based on the characterictics of these adolescents to improve their life skills during puberty.
文摘There is an increasing concern about agriculture’s role in polluting the environment which makes farmers feel guilty about using fertilizers. Fertigation is proposed as a panacea to this dilemma, which by this practice reaffirms the principles of 4Rs which are the right source, at the right rate, right time and right place. The aim of this study was to explore constraints and opportunities for its application in developing countries for environmentally friendly fertilizers application. It is a review of literature from government reports, legislature and published material on fertilization and irrigation initiatives of developing countries which include Rwanda, Nepal, Suriname, Zambia, Panama, Tanzania, Sri Lanka and South Sudan in addition to the case presented of China during the “2016 Environmentally Friendly Fertilizer Production, Application and Demonstration from Developing Countries” training course. The study found that in developing countries there is potential to apply fertigation as a way of environmentally friendly fertilizers application as it has been adopted in China. These opportunities include the following: Abundant natural resources like land and water, less polluted environment, conducive agricultural policies, zero duties levied on imported irrigation equipment. However, a number of limitations also are highlighted including: Lack of investment, lack of infrastructure, lack of information, requires expertise on plant nutrition and management of fertigation system, require soil analysis and proper interpretation which is done by experts. This study provides relevant information for fertigation planning and application in respective developing countries.
基金financially supported by the National Natural Science Foundation of China (No. 51903237)Beijing Natural Science Foundation (No. 2222091)
文摘Sizing treatment has shown great potential in improving the interfacial properties of poly(p-phenylene benzodioxazole)(PBO)fiber-reinforced composites,but is severely limited due to the use of flammable and explosive organic solvents.Herein,a new high-efficiency waterborne sizing agent has been developed by using functionalized carbon nanospheres(CNSs)as a nano-reinforcement.Due to abundant oxygen-containing groups,the CNSs greatly improves the surface activity,wettability,and roughness of the PBO fibers.As a result,the interfacial shear strength of the CNSs sized fiber-reinforced composite increases by 79.6%compared with that of the pristine fiber-reinforced composite.Moreover,the excellent mechanical and thermal properties of the PBO fibers remain almost unchanged after sizing treatment.Thus,this work provides an environmentally friendly and scalable method for constructing a strong interface between the PBO fibers and the matrix resins,which makes sense in promoting the application of PBO fiber-reinforced composites in aerospace and military industries.
基金financially supported by National Natural Science Foundation of China(No.52074330)National Natural Science Foundation of China Major Projects(No.51991361).
文摘With the exploration and development of deep and ultra-deep oil and gas,high torque and high friction during the drilling of deep and ultra-deep wells become one of the key issues affecting drilling safety and drilling speed.Meanwhile,the high temperature and high salt problem in deep formations is prominent,which poses a major challenge to the lubricity of drilling fluids under high temperature and high salt.This paper reports an organic borate ester SOP as an environmentally friendly drilling fluid lubricant.The performance evaluation results show that when 1%lubricant SOP is added to the fresh water-based mud,the lubrication coefficient decreases from 0.631 to 0.046,and the reduction rate of lubrication coefficient is 92.7%.Under the conditions of 210℃ and 30%NaCl,the reduction rate of lubricating coefficient of the base slurry with 1%SOP was still remain 81.5%.After adding 1%SOP,the wear volume decreased by 94.11%compared with the base slurry.The contact resistance experiment during the friction process shows that SOP can form a thick adsorption film on the friction surface under high temperature and high salt conditions,thus effectively reducing the friction resistance.Molecular dynamics simulation shows that lubricant SOP can be physically adsorbed on the surface of drilling tool and borehole wall through hydrogen bond and van der Waals force.XPS analysis further shows that SOP adsorbs on the friction surface and reacts with metal atoms on the friction surface to form a chemically reactive film.Therefore,under high temperature and high salt conditions,the synergistic effect of physical adsorption film and chemical reaction film effectively reduces the frictional resistance and wear of the friction surface.In addition,SOP is non-toxic and easy to degrade.Therefore,SOP is a highly effective and environmentally friendly lubricant in high temperature and high salt drilling fluid.
