The hub-driven virtual rail train is a novel urban transportation system that amalgamates the benefits of modern trams and buses.However,this system is plagued by issues such as decreased ride comfort and severe defor...The hub-driven virtual rail train is a novel urban transportation system that amalgamates the benefits of modern trams and buses.However,this system is plagued by issues such as decreased ride comfort and severe deformation of urban roads due to the increase in sprung mass and long-term rolling at the same position.To address these concerns and improve the human-vehicle-road friendliness of the virtual rail train,we propose an Improved Sky-Ground Hook and Acceleration-Driven Damper control(Improved SH-GH-ADD control)strategy for the semi-active suspension system.This control monitors the vibration acceleration signal of the unsprung mass in real-time and selects the mixed Sky-Hook and Acceleration-Driven Damper(SH-ADD)control or the mixed Ground-Hook and Acceleration-Driven Damper(GH-ADD)control based on the positive and negative values of the vibration acceleration of the unsprung mass.The Improved SH-GH-ADD control combines the advantages of SH-ADD control and GH-ADD control to achieve control of the sprung mass and unsprung mass in the full fre-quency band.Finally,through simulation and comparative analysis with traditional SH-ADD,GH-ADD,and mixed SH-GH control,we demonstrate the exceptional performance of the proposed algorithm.展开更多
Goal of this research is to detect possible relations between animal-related attitudes and verbal aggressiveness as well as types combining such parameters. The sample collected in 2015 contains two adult education cl...Goal of this research is to detect possible relations between animal-related attitudes and verbal aggressiveness as well as types combining such parameters. The sample collected in 2015 contains two adult education classes equivalent to secondary school level (class A = 23 inmates and B = 12 inmates, all male) at a correctional facility. Questionnaires were used. Network analysis software (Visone) and conventional statistics (SPSS) are used for calculating network variables (indegree, outdegree, katz, pageranketc) and implementing Spearman test and Principal Component Analysis. Inmates who have adopted an animal-friendly value system and are too coward to react against torture of animals, maintain a repressed emotion. If they do not intervene and provoke, then they are also not targeted by others. No reaction against torture is also connected with a deep-rooted aggressiveness. Concerning superficial aggressiveness, a profile, whose characterize is multiple verbal aggressiveness, can be attributed to repressed emotions. A type is torturing and indifferently restricts his aggressiveness, as he can satisfy his need of dominance by being aggressive towards animals. A type of inmate who loves animals and reacts against their torture, presents the most restricted and relatively smooth aggressiveness, as he discharges his repressed emotions to this reaction. Under condition of indifference, keeping pets is not evidence of loving but of a need of companionship. As for the deep-rooted aggressiveness (over-extroversion), it does not seem to be triggered by any repression.展开更多
During the process of construction and maintenance, buildings have had many negativeeffects on the environment, such as destruction of the ecological environment, consumption of naturalresources, air pollution and gen...During the process of construction and maintenance, buildings have had many negativeeffects on the environment, such as destruction of the ecological environment, consumption of naturalresources, air pollution and generation of large amounts of construction waste. The development of greenbuildings has greatly improved the negative impact of buildings on the environment. In the whole life cycleof construction and maintenance of buildings, the consumption of natural resources is reduced, and thedamage to the environment is reduced. In this article, the representative green buildings in Asia are analyzedfrom the aspects of regional humanity, land saving measures, energy-saving measures, behavior-guidedgreen design strategies, building materials, effective greening measures and smart city strategies, and theexcellent design strategies are summarized, in order to provide reference for future architectural practice.展开更多
In connection with the current prospect of decarbonization of coal energy through the use of small nuclear power plants (SNPPs) at existing TPPs as heat sources for heat supply to municipal heating networks, there is ...In connection with the current prospect of decarbonization of coal energy through the use of small nuclear power plants (SNPPs) at existing TPPs as heat sources for heat supply to municipal heating networks, there is a technological need to improve heat supply schemes to increase their environmental friendliness and efficiency. The paper proves the feasibility of using the heat-feeding mode of ASHPs for urban heat supply by heating the network water with steam taken from the turbine. The ratio of electric and thermal power of a “nuclear” combined heat and power plant is given. The advantage of using a heat pump, which provides twice as much electrical power with the same heat output, is established. Taking into account that heat in these modes is supplied with different potential, the energy efficiency was used to compare these options. To increase the heat supply capacity, a scheme with the use of a high-pressure heater in the backpressure mode and with the heating of network water with hot steam was proposed. Heat supply from ASHPs is efficient and environmentally friendly even in the case of significant remoteness of heat consumers.展开更多
Hello,everyone!I'm Zhang Yan from No.4 Middle School in Fucheng County.I'd like to share my school life with you.At the same time,I hope you enjoy yours!We have many subjects at school,such as Chinese,English,...Hello,everyone!I'm Zhang Yan from No.4 Middle School in Fucheng County.I'd like to share my school life with you.At the same time,I hope you enjoy yours!We have many subjects at school,such as Chinese,English,math,history and so on.I am focused more on Chinese,for I think it's getting more and more widely used all over the world.Our teachers are friendly and helpful.Whenever I have problems,they are always ready to give me a hand.展开更多
The evaluation of sustainable land use is the key issue in the field of studying the sustainable land utilization. In general analysis, the sustainable land use is evaluated respectively from its ecological sustainabi...The evaluation of sustainable land use is the key issue in the field of studying the sustainable land utilization. In general analysis, the sustainable land use is evaluated respectively from its ecological sustainability, economic sustainability and social sustainability in China and other countries in recent years. Although this evaluation is an important work, it seems insufficient and hard to comprehensively reflect the whole degree of land use sustainability. Thus, to make up this deficiency, this paper brings forward the evaluation indexes, which make it possible to quantitatively reflect the whole degree of land use sustainability, namely, the concept of ＂degrees of overall land use sustainability＂ （Dos）, and research and measurement development of the method of and calculation in Dos. Taking the evaluation of the degree of land use sustainability in county regions of Yunnan Province as the actual example for analysis, results are basically as follows： 1） The degree of land use sustainability （Dos） is the ration index to organically and systematically integrate the degree of ecological friendliness （DeF）, the degree of economic viability （Dev） and the degree of social acceptability （Dsa）, able to comprehensively reflect the whole sustainability degree of regional land use 2） Based on the value of Dos, the grading system and standard for the sustainability of land use may be established and totally divided into five grades, namely, the high-degree sustainability, middle-degree sustainability, low-degree sustainability, conditional sustainability and non-sustainability. Meanwhile, the standard for distinguishing sustainability grades has also been confirmed so as to determine the nature of sustainability degrees in different grades. This makes the possibility for the combination of nature determination with ration in research result and provides with the scientific guideline and decision-making gist for better implementation of sustainable land use strategy. 3） The practice in evaluation of sustainability degree in county regional land use in Yunnan shows that the value of the degree of land use sustainability （Dos） of whole Yunnan Province is only 58.39, belonging to the grade of low-degree sustainability. Two thirds of counties in the whole province represent the grade of ＂conditional sustainability＂ and ＂non-sustainability＂ in the sustainability of land use. Among these counties, 11.11 % shows ＂non- sustainability＇. The lowest degree of land use sustainability appears especially in the middle plateau mountain region of Northeast Yunnan, where the value of Dos in most counties （districts） is below 40 %, belonging to the grade of ＂non-sustainability＂. The sustainability degree in the karst mountainous region in lower-middle plateau mountain region in Southeast Yunnan is generally low and the value of sustainability degree （Dos） in most of the counties （cities and districts） is below 55. The value of sustainability degree （Dos） in most of the counties （cities and districts） in the north, west, northwest and southwest parts of Yunnan is below 55. This article also analyzes the reasons of low degree of sustainability in land use in Yunnan and puts forward the countermeasures to increase the degree of sustainability in land use in the whole province.展开更多
An environmental friendly anodizing treatment (Anomag) from a phosphate-based so lution without heavy metals on AZ91D magnesium alloy was studied. The characteri stics of the coatings, such as structure, composition a...An environmental friendly anodizing treatment (Anomag) from a phosphate-based so lution without heavy metals on AZ91D magnesium alloy was studied. The characteri stics of the coatings, such as structure, composition and corrosion resistance w ere investigated. The effects of this anodizing treatment on the mechanical prop erties were examined. X-ray diffraction (XRD) analysis revealed that the structu re of the coatings is amorphous or glassy. In salt spray tests coatings with an average thickness of 10μm had an anticorrosive performance of over 1000 hours. Fatigue tests revealed that anodizing onto AZ91D magnesium alloy does not affect the fatigue strength. These results demonstrate the utility of this anodizing t reatment on magnesium alloy for application as a structural material, such as in the automotive field.展开更多
The security of digital images transmitted via the Internet or other public media is of the utmost importance.Image encryption is a method of keeping an image secure while it travels across a non-secure communication ...The security of digital images transmitted via the Internet or other public media is of the utmost importance.Image encryption is a method of keeping an image secure while it travels across a non-secure communication medium where it could be intercepted by unauthorized entities.This study provides an approach to color image encryption that could find practical use in various contexts.The proposed method,which combines four chaotic systems,employs singular value decomposition and a chaotic sequence,making it both secure and compression-friendly.The unified average change intensity,the number of pixels’change rate,information entropy analysis,correlation coefficient analysis,compression friendliness,and security against brute force,statistical analysis and differential attacks are all used to evaluate the algorithm’s performance.Following a thorough investigation of the experimental data,it is concluded that the proposed image encryption approach is secure against a wide range of attacks and provides superior compression friendliness when compared to chaos-based alternatives.展开更多
In the study, a novel environmental soybean seed coating agent was made of natural polymer, trace elements, trace fertilizer and biopesticides etc., with the condition of high performance-to-price ratio and environmen...In the study, a novel environmental soybean seed coating agent was made of natural polymer, trace elements, trace fertilizer and biopesticides etc., with the condition of high performance-to-price ratio and environmental friendliness. Effects of this soybean seed coating agent on soybean yield were tested through the laboratory and farm experiments. The tested results showed that the soybean yield using this seed coating agent was increased by 15.46%, and its cost was decreased by 27.8%, compared with the conventional soybean seed coating agent. It’s nontoxic and harmless to human and animals, more friendly to the environment. So it has obvious economic and environmental benefits.展开更多
A sewage heat pump system and its application based on a project in Chongqing,China,were discussed. Based on the sewage conditions,a feasibility analysis of the sewage heat pump air conditioning system was conducted. ...A sewage heat pump system and its application based on a project in Chongqing,China,were discussed. Based on the sewage conditions,a feasibility analysis of the sewage heat pump air conditioning system was conducted. The theoretical and quantitative calculations indicate that sewage flux in the city sewage main pipe in the project can satisfy heat exchange requirements,and taking water from the pipes has relatively small influence on the pipe net in summer and winter. The sewage heat pump air-conditioning system can save 21.5% operating cost in one year,which is energy efficient and environmentally friendly.展开更多
The cyclo-N_(6)anion is a total nitrogen unit with higher nitrogen content than cyclo-N^(-)_(5).However,the low decomposition barrier of cyclo-N_(6)anions hinders its application as a high energy density material(HEDM...The cyclo-N_(6)anion is a total nitrogen unit with higher nitrogen content than cyclo-N^(-)_(5).However,the low decomposition barrier of cyclo-N_(6)anions hinders its application as a high energy density material(HEDM).Using first-principles calculations,we reveal that the covalent components that enhance the interaction between the cyclo-N_(6)anion and the cation can effectively improve the stability of cyclo-N_(6)anions.The actinide metals(Th,Pa,U)are selected as suitable cations.Further electronic structure analysis showed that the charge transfer from the actinide metal to cyclo-N_(6)anions resulted in a strong covalent bond,which promoted the stability of the cyclo-N_(6)anion in the Th(N_(6)),Pa(N_(6)),and U(N_(6))structure.This discovery is helpful for the rational design and synthesis of new HEDMs.展开更多
The traditional transport industry makes a lot of damage to the nature and consumes a large part of resources.In this paper,we study transportation system from the perspective of dynamic balance of ecological,economic...The traditional transport industry makes a lot of damage to the nature and consumes a large part of resources.In this paper,we study transportation system from the perspective of dynamic balance of ecological,economic and social benefits,and then put forward the theoretical framework of ecological transportation based on ecological responsibility which is mainly about resource-saving and environmentfriendly constraints,including the connotation,characteristics,driving factors and impact factors of ecological transportation.On this basis,this study applies the system dynamics to establish a dynamic model for the balance between transportation system and external environment including economic,policy,resource and environment.展开更多
Five studies were conducted in order to produce less waste and economize the application of a CdCl2–Na3C6H5O7– KOH–H3BO3/NaOH/KCl–(NH2)2CS definite aqueous system in the chemical bath deposition of CdS thin films,...Five studies were conducted in order to produce less waste and economize the application of a CdCl2–Na3C6H5O7– KOH–H3BO3/NaOH/KCl–(NH2)2CS definite aqueous system in the chemical bath deposition of CdS thin films, as well as to generate supporting information helpful to explain the effects of varying certain parameters established for the use of this formulation. These studies are related to the utility of the pH 10 borate buffer, to the selection of the appropriateOH–concentration, commercial alkali, and reaction temperature, and to the reusing of the residual solution. These studies were conducted by means of optical characterization, pH measurements, energy consumption tests, and chemical analysis;and all possible implications were analyzed in detail and widely supported by the literature. It is observed that the addition of 5.0 mL of pH 10 borate buffer in the reaction solutions only causes a slight reduction in the pH value and, therefore, in the thickness of the resulted films. It is observed that a decrease in CdCl2 concentration causes an increase in the pH values, and when such reagent concentration is varied it is necessary to determine the pH value at which the best CdS films can be obtained;this indicates the existence of an optimum pH of deposition, depending on the used reagent concentrations. It is demonstrated that the use of KOH and NaOH is interchangeable, and the advantages of NaOH are evaluated in the context of hygroscopicity, CO2 absorption, purity, and price. It is observed that the energy consumption when depositing a determined film is lower at high temperatures, and it is concluded that the time and energy savings at high temperatures are undoubtedly advantages in the deposition process of CdS thin films. A formulation to recycle the residual solution is presented, which is very important for the reducing of residual volume, and, therefore, in the minimizing of the environmental impact. An indirect objective of this work is to generate interest in identifying those points that could be modified in other chemical formulations to minimize costs and waste.展开更多
Cycling fever has gripped much of China during recent years,as many people have chosen cycling as a way to commute,keep fit and/or relax.Cycling is environmentally friendly,and it helps people,especially those who are...Cycling fever has gripped much of China during recent years,as many people have chosen cycling as a way to commute,keep fit and/or relax.Cycling is environmentally friendly,and it helps people,especially those who are younger,relieve stress and enrich their social lives.Cycling fever also reflects a positive attitude toward life.展开更多
"Ladies,your performance was really amazing!"As the members of the Yuying Choir of Fuzhou No.16 Middle School stepped off the stage,many of their peers from across the Pacific rushed over,greeting them with ..."Ladies,your performance was really amazing!"As the members of the Yuying Choir of Fuzhou No.16 Middle School stepped off the stage,many of their peers from across the Pacific rushed over,greeting them with typical American exuberance.After a brief moment of surprise,the Chinese girls-whose average age was just 15-quickly responded with the same warmth and friendliness.展开更多
|Advantages and Challenges Aqueous batteries offer enhanced safety due to their nonflam-mable water-based electrolytes and are more environmentally friendly compared to traditional lithium-ion batteries using organic ...|Advantages and Challenges Aqueous batteries offer enhanced safety due to their nonflam-mable water-based electrolytes and are more environmentally friendly compared to traditional lithium-ion batteries using organic electrolytes[1].As compared in Table 1[2-5],aqueous lithium-ion batteries(ALIBs)offer a balanced performance profile among aqueous battery systems.With an energy density of approximately 100-150 Wh kg^(−1)and a power density around 500-1000 W kg^(−1),they surpass aqueous lead-acid batteries,which have lower energy(30-50 Wh kg^(−1))and power densities(200-300 W kg^(−1)).展开更多
Microbial manufacturing offers an alternative approach to producing chemicals and materials in a sustainable and environmentally friendly manner.Despite its significance and widespread attention,various challenges per...Microbial manufacturing offers an alternative approach to producing chemicals and materials in a sustainable and environmentally friendly manner.Despite its significance and widespread attention,various challenges persist in its industrial application.We propose a systematic approach to microbial biotechnology-a comprehensive framework for developing customized technologies tailored to the unique characteristics of the entire process for specific products.It utilizes approaches such as simplifying the process,sequential rearrangement,and coupling steps to systematically and holistically address the bottlenecks of the entire process in microbial manufacturing,aiming to achieve optimal economic and environmental benefits.This method involves the integration of multiple disciplines,including enzymology,synthetic biology,metabolic engineering,fermentation,separation engineering,and artificial intelligence(AI)technology.Here,we present several cases involving various stages of product bioproduction,developed under the concept of systematic microbial biotechnology,to demonstrate its effectiveness and advantages.The development and application of these technological concepts hold significant potential to shape the future of a sustainable circular bioeconomy driven by microbial manufacturing.展开更多
Bioinspired energy‐autonomous interactive electronics are prevalent.However,self‐powered artificial skins are often challenging to be combined with excellent mechanical properties,optical transparency,autonomous att...Bioinspired energy‐autonomous interactive electronics are prevalent.However,self‐powered artificial skins are often challenging to be combined with excellent mechanical properties,optical transparency,autonomous attachability,and biocompatibility.Herein,a robust ecological polyionic skin(polyionic eco‐skin)based on triboelectric mechanism consisting of ethyl cellulose/waterborne polyurethane/Cu nanoparticles(EWC)green electroactive sensitive material and polyethylene oxide/waterborne polyurethane/phytic acid(PWP)polyionic current collector is proposed.The polyionic eco‐skin features sufficient stretchability(90%)and low Young's modulus(0.8MPa)close to that of human soft tissue,high transparency(>84%of transmission)in the visible light range,and broad static/dynamic adhesiveness,which endows it with strong adaptive implementation capacity in flexible curved electronics.More importantly,the self‐powered polyionic eco‐skin exhibits enhanced force‐electric conversion performance by coordinating the effect of nanoparticlepolymer interfacial polarization and porous structure of sensitive material.Integrating multiple characteristics enables the polyionic ecoskin to effectively convert biomechanical energy into electrical energy,supporting self‐powered functionality for itself and related circuits.Moreover,the eco‐skin can be utilized to construct an interactive system and realize the remote noncontact manipulation of targets.The polyionic eco‐skin holds tremendous application potential in self‐powered security systems,human-machine interaction interfaces,and bionic robots,which is expected to inject new vitality into a human-cyber-physical intelligence integration.展开更多
Semiconductor quantum dots(QDs),as promising fluorescent materials,have been widely applied in biomedical application due to their unique optical properties.Currently,the most intensively studied are Cd-containing QDs...Semiconductor quantum dots(QDs),as promising fluorescent materials,have been widely applied in biomedical application due to their unique optical properties.Currently,the most intensively studied are Cd-containing QDs(Cd-based QDs),whose potential toxicity prevents their further commercialization.In recent years,the eco-friendly QDs with low toxicity and environmental friendliness have begun to be developed,showing great potential in biomedical applications.The high-quality synthesis of eco-friendly QDs and the appropriate surface modification are key to realize their applications.This review summarizes the progress of eco-friendly QDs for biomedical applications,including their designed preparation,optical properties,surface modification,toxicity,and their applications in bioimaging and diagnostics.Finally,the challenges of eco-friendly QDs for future bioimaging and diagnostics application were provided.We believe this review will provide important guidance for promoting the development of eco-friendly QDs in bioimaging and diagnostics.展开更多
Transferring MoS2 films from growth substrates onto target substrates is a critical issue for their practical applications. Moreover, it remains a great challenge to avoid sample degradation and substrate destruction,...Transferring MoS2 films from growth substrates onto target substrates is a critical issue for their practical applications. Moreover, it remains a great challenge to avoid sample degradation and substrate destruction, because the current transfer method inevitably employs a wet chemical etching process. We developed an etching-free transfer method for transferring MoS2 films onto arbitrary substrates by using ultrasonication. Briefly, the collapse of ultrasonication-generated microbubbles at the interface between polymer-coated MoS2 film and substrates induce sufficient force to delaminate the MoS2 films. Using this method, the MoS2 films can be transferred from all substrates （silica, mica, strontium titanate, and sapphire） and retains the original sample morphology and quality. This method guarantees a simple transfer process and allows the reuse of growth substrates, without involving any hazardous etchants. The etching-free transfer method is likely to promote broad applications of MoS2 in photodetectors.展开更多
基金This research was funded by Natural Science Foundation of Sichuan Province(2023NSFSC0395)the Sichuan Science and Technology Program(2022ZH CG0061)the SWJTU Science and Technology Innovation Project(2682022CX008).
文摘The hub-driven virtual rail train is a novel urban transportation system that amalgamates the benefits of modern trams and buses.However,this system is plagued by issues such as decreased ride comfort and severe deformation of urban roads due to the increase in sprung mass and long-term rolling at the same position.To address these concerns and improve the human-vehicle-road friendliness of the virtual rail train,we propose an Improved Sky-Ground Hook and Acceleration-Driven Damper control(Improved SH-GH-ADD control)strategy for the semi-active suspension system.This control monitors the vibration acceleration signal of the unsprung mass in real-time and selects the mixed Sky-Hook and Acceleration-Driven Damper(SH-ADD)control or the mixed Ground-Hook and Acceleration-Driven Damper(GH-ADD)control based on the positive and negative values of the vibration acceleration of the unsprung mass.The Improved SH-GH-ADD control combines the advantages of SH-ADD control and GH-ADD control to achieve control of the sprung mass and unsprung mass in the full fre-quency band.Finally,through simulation and comparative analysis with traditional SH-ADD,GH-ADD,and mixed SH-GH control,we demonstrate the exceptional performance of the proposed algorithm.
文摘Goal of this research is to detect possible relations between animal-related attitudes and verbal aggressiveness as well as types combining such parameters. The sample collected in 2015 contains two adult education classes equivalent to secondary school level (class A = 23 inmates and B = 12 inmates, all male) at a correctional facility. Questionnaires were used. Network analysis software (Visone) and conventional statistics (SPSS) are used for calculating network variables (indegree, outdegree, katz, pageranketc) and implementing Spearman test and Principal Component Analysis. Inmates who have adopted an animal-friendly value system and are too coward to react against torture of animals, maintain a repressed emotion. If they do not intervene and provoke, then they are also not targeted by others. No reaction against torture is also connected with a deep-rooted aggressiveness. Concerning superficial aggressiveness, a profile, whose characterize is multiple verbal aggressiveness, can be attributed to repressed emotions. A type is torturing and indifferently restricts his aggressiveness, as he can satisfy his need of dominance by being aggressive towards animals. A type of inmate who loves animals and reacts against their torture, presents the most restricted and relatively smooth aggressiveness, as he discharges his repressed emotions to this reaction. Under condition of indifference, keeping pets is not evidence of loving but of a need of companionship. As for the deep-rooted aggressiveness (over-extroversion), it does not seem to be triggered by any repression.
基金Sponsored by Interdisciplinary Research Projects of the Fundamental Research Funds for the Central Universities(DUT19JC55)High-level Talents Innovation Support Project of Dalian City(2017RQ076).
文摘During the process of construction and maintenance, buildings have had many negativeeffects on the environment, such as destruction of the ecological environment, consumption of naturalresources, air pollution and generation of large amounts of construction waste. The development of greenbuildings has greatly improved the negative impact of buildings on the environment. In the whole life cycleof construction and maintenance of buildings, the consumption of natural resources is reduced, and thedamage to the environment is reduced. In this article, the representative green buildings in Asia are analyzedfrom the aspects of regional humanity, land saving measures, energy-saving measures, behavior-guidedgreen design strategies, building materials, effective greening measures and smart city strategies, and theexcellent design strategies are summarized, in order to provide reference for future architectural practice.
文摘In connection with the current prospect of decarbonization of coal energy through the use of small nuclear power plants (SNPPs) at existing TPPs as heat sources for heat supply to municipal heating networks, there is a technological need to improve heat supply schemes to increase their environmental friendliness and efficiency. The paper proves the feasibility of using the heat-feeding mode of ASHPs for urban heat supply by heating the network water with steam taken from the turbine. The ratio of electric and thermal power of a “nuclear” combined heat and power plant is given. The advantage of using a heat pump, which provides twice as much electrical power with the same heat output, is established. Taking into account that heat in these modes is supplied with different potential, the energy efficiency was used to compare these options. To increase the heat supply capacity, a scheme with the use of a high-pressure heater in the backpressure mode and with the heating of network water with hot steam was proposed. Heat supply from ASHPs is efficient and environmentally friendly even in the case of significant remoteness of heat consumers.
文摘Hello,everyone!I'm Zhang Yan from No.4 Middle School in Fucheng County.I'd like to share my school life with you.At the same time,I hope you enjoy yours!We have many subjects at school,such as Chinese,English,math,history and so on.I am focused more on Chinese,for I think it's getting more and more widely used all over the world.Our teachers are friendly and helpful.Whenever I have problems,they are always ready to give me a hand.
文摘The evaluation of sustainable land use is the key issue in the field of studying the sustainable land utilization. In general analysis, the sustainable land use is evaluated respectively from its ecological sustainability, economic sustainability and social sustainability in China and other countries in recent years. Although this evaluation is an important work, it seems insufficient and hard to comprehensively reflect the whole degree of land use sustainability. Thus, to make up this deficiency, this paper brings forward the evaluation indexes, which make it possible to quantitatively reflect the whole degree of land use sustainability, namely, the concept of ＂degrees of overall land use sustainability＂ （Dos）, and research and measurement development of the method of and calculation in Dos. Taking the evaluation of the degree of land use sustainability in county regions of Yunnan Province as the actual example for analysis, results are basically as follows： 1） The degree of land use sustainability （Dos） is the ration index to organically and systematically integrate the degree of ecological friendliness （DeF）, the degree of economic viability （Dev） and the degree of social acceptability （Dsa）, able to comprehensively reflect the whole sustainability degree of regional land use 2） Based on the value of Dos, the grading system and standard for the sustainability of land use may be established and totally divided into five grades, namely, the high-degree sustainability, middle-degree sustainability, low-degree sustainability, conditional sustainability and non-sustainability. Meanwhile, the standard for distinguishing sustainability grades has also been confirmed so as to determine the nature of sustainability degrees in different grades. This makes the possibility for the combination of nature determination with ration in research result and provides with the scientific guideline and decision-making gist for better implementation of sustainable land use strategy. 3） The practice in evaluation of sustainability degree in county regional land use in Yunnan shows that the value of the degree of land use sustainability （Dos） of whole Yunnan Province is only 58.39, belonging to the grade of low-degree sustainability. Two thirds of counties in the whole province represent the grade of ＂conditional sustainability＂ and ＂non-sustainability＂ in the sustainability of land use. Among these counties, 11.11 % shows ＂non- sustainability＇. The lowest degree of land use sustainability appears especially in the middle plateau mountain region of Northeast Yunnan, where the value of Dos in most counties （districts） is below 40 %, belonging to the grade of ＂non-sustainability＂. The sustainability degree in the karst mountainous region in lower-middle plateau mountain region in Southeast Yunnan is generally low and the value of sustainability degree （Dos） in most of the counties （cities and districts） is below 55. The value of sustainability degree （Dos） in most of the counties （cities and districts） in the north, west, northwest and southwest parts of Yunnan is below 55. This article also analyzes the reasons of low degree of sustainability in land use in Yunnan and puts forward the countermeasures to increase the degree of sustainability in land use in the whole province.
文摘An environmental friendly anodizing treatment (Anomag) from a phosphate-based so lution without heavy metals on AZ91D magnesium alloy was studied. The characteri stics of the coatings, such as structure, composition and corrosion resistance w ere investigated. The effects of this anodizing treatment on the mechanical prop erties were examined. X-ray diffraction (XRD) analysis revealed that the structu re of the coatings is amorphous or glassy. In salt spray tests coatings with an average thickness of 10μm had an anticorrosive performance of over 1000 hours. Fatigue tests revealed that anodizing onto AZ91D magnesium alloy does not affect the fatigue strength. These results demonstrate the utility of this anodizing t reatment on magnesium alloy for application as a structural material, such as in the automotive field.
基金funded by Deanship of Scientific Research at King Khalid University under Grant Number R.G.P.2/86/43.
文摘The security of digital images transmitted via the Internet or other public media is of the utmost importance.Image encryption is a method of keeping an image secure while it travels across a non-secure communication medium where it could be intercepted by unauthorized entities.This study provides an approach to color image encryption that could find practical use in various contexts.The proposed method,which combines four chaotic systems,employs singular value decomposition and a chaotic sequence,making it both secure and compression-friendly.The unified average change intensity,the number of pixels’change rate,information entropy analysis,correlation coefficient analysis,compression friendliness,and security against brute force,statistical analysis and differential attacks are all used to evaluate the algorithm’s performance.Following a thorough investigation of the experimental data,it is concluded that the proposed image encryption approach is secure against a wide range of attacks and provides superior compression friendliness when compared to chaos-based alternatives.
文摘In the study, a novel environmental soybean seed coating agent was made of natural polymer, trace elements, trace fertilizer and biopesticides etc., with the condition of high performance-to-price ratio and environmental friendliness. Effects of this soybean seed coating agent on soybean yield were tested through the laboratory and farm experiments. The tested results showed that the soybean yield using this seed coating agent was increased by 15.46%, and its cost was decreased by 27.8%, compared with the conventional soybean seed coating agent. It’s nontoxic and harmless to human and animals, more friendly to the environment. So it has obvious economic and environmental benefits.
基金Project(50838009) supported by the National Natural Science Foundation of ChinaProjects(2006BAJ02A09+1 种基金2006BAJ02A13-4) supported by the National Key Technologies R&D ProgramProject(2006BAJ01A06-3) supported by the Key R & D Program during the Eleventh Five-Year Plan Period,China
文摘A sewage heat pump system and its application based on a project in Chongqing,China,were discussed. Based on the sewage conditions,a feasibility analysis of the sewage heat pump air conditioning system was conducted. The theoretical and quantitative calculations indicate that sewage flux in the city sewage main pipe in the project can satisfy heat exchange requirements,and taking water from the pipes has relatively small influence on the pipe net in summer and winter. The sewage heat pump air-conditioning system can save 21.5% operating cost in one year,which is energy efficient and environmentally friendly.
基金National Natural Science Foundation of China(No.11805157)Sichuan Provincial Department of Science and Technology Application Fundamental Research,China(No.2017JY0146)+1 种基金China West Normal University Scientific Research Innovation Team Project(No.CXTD2016-2)China West Normal University Talent Research Fund Project(No.CXTD2017-10)。
文摘The cyclo-N_(6)anion is a total nitrogen unit with higher nitrogen content than cyclo-N^(-)_(5).However,the low decomposition barrier of cyclo-N_(6)anions hinders its application as a high energy density material(HEDM).Using first-principles calculations,we reveal that the covalent components that enhance the interaction between the cyclo-N_(6)anion and the cation can effectively improve the stability of cyclo-N_(6)anions.The actinide metals(Th,Pa,U)are selected as suitable cations.Further electronic structure analysis showed that the charge transfer from the actinide metal to cyclo-N_(6)anions resulted in a strong covalent bond,which promoted the stability of the cyclo-N_(6)anion in the Th(N_(6)),Pa(N_(6)),and U(N_(6))structure.This discovery is helpful for the rational design and synthesis of new HEDMs.
基金supported by the National Social Science Fund of China(Grant No.15BJY069)Shanghai University Knowledge Service Platform(Grant No.ZF1209)
文摘The traditional transport industry makes a lot of damage to the nature and consumes a large part of resources.In this paper,we study transportation system from the perspective of dynamic balance of ecological,economic and social benefits,and then put forward the theoretical framework of ecological transportation based on ecological responsibility which is mainly about resource-saving and environmentfriendly constraints,including the connotation,characteristics,driving factors and impact factors of ecological transportation.On this basis,this study applies the system dynamics to establish a dynamic model for the balance between transportation system and external environment including economic,policy,resource and environment.
文摘Five studies were conducted in order to produce less waste and economize the application of a CdCl2–Na3C6H5O7– KOH–H3BO3/NaOH/KCl–(NH2)2CS definite aqueous system in the chemical bath deposition of CdS thin films, as well as to generate supporting information helpful to explain the effects of varying certain parameters established for the use of this formulation. These studies are related to the utility of the pH 10 borate buffer, to the selection of the appropriateOH–concentration, commercial alkali, and reaction temperature, and to the reusing of the residual solution. These studies were conducted by means of optical characterization, pH measurements, energy consumption tests, and chemical analysis;and all possible implications were analyzed in detail and widely supported by the literature. It is observed that the addition of 5.0 mL of pH 10 borate buffer in the reaction solutions only causes a slight reduction in the pH value and, therefore, in the thickness of the resulted films. It is observed that a decrease in CdCl2 concentration causes an increase in the pH values, and when such reagent concentration is varied it is necessary to determine the pH value at which the best CdS films can be obtained;this indicates the existence of an optimum pH of deposition, depending on the used reagent concentrations. It is demonstrated that the use of KOH and NaOH is interchangeable, and the advantages of NaOH are evaluated in the context of hygroscopicity, CO2 absorption, purity, and price. It is observed that the energy consumption when depositing a determined film is lower at high temperatures, and it is concluded that the time and energy savings at high temperatures are undoubtedly advantages in the deposition process of CdS thin films. A formulation to recycle the residual solution is presented, which is very important for the reducing of residual volume, and, therefore, in the minimizing of the environmental impact. An indirect objective of this work is to generate interest in identifying those points that could be modified in other chemical formulations to minimize costs and waste.
文摘Cycling fever has gripped much of China during recent years,as many people have chosen cycling as a way to commute,keep fit and/or relax.Cycling is environmentally friendly,and it helps people,especially those who are younger,relieve stress and enrich their social lives.Cycling fever also reflects a positive attitude toward life.
文摘"Ladies,your performance was really amazing!"As the members of the Yuying Choir of Fuzhou No.16 Middle School stepped off the stage,many of their peers from across the Pacific rushed over,greeting them with typical American exuberance.After a brief moment of surprise,the Chinese girls-whose average age was just 15-quickly responded with the same warmth and friendliness.
基金supported by the Australian Research Council(IE240100186,IH20010003).
文摘|Advantages and Challenges Aqueous batteries offer enhanced safety due to their nonflam-mable water-based electrolytes and are more environmentally friendly compared to traditional lithium-ion batteries using organic electrolytes[1].As compared in Table 1[2-5],aqueous lithium-ion batteries(ALIBs)offer a balanced performance profile among aqueous battery systems.With an energy density of approximately 100-150 Wh kg^(−1)and a power density around 500-1000 W kg^(−1),they surpass aqueous lead-acid batteries,which have lower energy(30-50 Wh kg^(−1))and power densities(200-300 W kg^(−1)).
基金supported by the National Natural Science Foundation of China(U2024A20478 and 32170084)the Natural Science Foundation of Shandong Province(ZR2023MC163)+1 种基金Young Taishan Scholars(TSQN201909159)Youth Innovation Promotion Association CAS(Y2021063)。
文摘Microbial manufacturing offers an alternative approach to producing chemicals and materials in a sustainable and environmentally friendly manner.Despite its significance and widespread attention,various challenges persist in its industrial application.We propose a systematic approach to microbial biotechnology-a comprehensive framework for developing customized technologies tailored to the unique characteristics of the entire process for specific products.It utilizes approaches such as simplifying the process,sequential rearrangement,and coupling steps to systematically and holistically address the bottlenecks of the entire process in microbial manufacturing,aiming to achieve optimal economic and environmental benefits.This method involves the integration of multiple disciplines,including enzymology,synthetic biology,metabolic engineering,fermentation,separation engineering,and artificial intelligence(AI)technology.Here,we present several cases involving various stages of product bioproduction,developed under the concept of systematic microbial biotechnology,to demonstrate its effectiveness and advantages.The development and application of these technological concepts hold significant potential to shape the future of a sustainable circular bioeconomy driven by microbial manufacturing.
基金supported by the National Natural Science Foundation of China(52403284,52473270 and T2422028)the Natural Science Foundation of Jiangsu Province(BK20240481)+3 种基金the fellowship of China National Postdoctoral Program for Innovative Talents(BX20240408)the National Key R&D Program of China(2022YFA1203304)the Suzhou Institute of Nano‐Tech and Nano‐Bionics,Chinese Academy of Sciences(start‐up grant E1552102)Jiangsu Funding Program for Excellent Postdoctoral Talent.
文摘Bioinspired energy‐autonomous interactive electronics are prevalent.However,self‐powered artificial skins are often challenging to be combined with excellent mechanical properties,optical transparency,autonomous attachability,and biocompatibility.Herein,a robust ecological polyionic skin(polyionic eco‐skin)based on triboelectric mechanism consisting of ethyl cellulose/waterborne polyurethane/Cu nanoparticles(EWC)green electroactive sensitive material and polyethylene oxide/waterborne polyurethane/phytic acid(PWP)polyionic current collector is proposed.The polyionic eco‐skin features sufficient stretchability(90%)and low Young's modulus(0.8MPa)close to that of human soft tissue,high transparency(>84%of transmission)in the visible light range,and broad static/dynamic adhesiveness,which endows it with strong adaptive implementation capacity in flexible curved electronics.More importantly,the self‐powered polyionic eco‐skin exhibits enhanced force‐electric conversion performance by coordinating the effect of nanoparticlepolymer interfacial polarization and porous structure of sensitive material.Integrating multiple characteristics enables the polyionic ecoskin to effectively convert biomechanical energy into electrical energy,supporting self‐powered functionality for itself and related circuits.Moreover,the eco‐skin can be utilized to construct an interactive system and realize the remote noncontact manipulation of targets.The polyionic eco‐skin holds tremendous application potential in self‐powered security systems,human-machine interaction interfaces,and bionic robots,which is expected to inject new vitality into a human-cyber-physical intelligence integration.
基金support from the research project of the National Natural Science Foundation of China(Nos.81902158 and 51972098)the Science and Technology Department of Henan Province(No.242102231045).
文摘Semiconductor quantum dots(QDs),as promising fluorescent materials,have been widely applied in biomedical application due to their unique optical properties.Currently,the most intensively studied are Cd-containing QDs(Cd-based QDs),whose potential toxicity prevents their further commercialization.In recent years,the eco-friendly QDs with low toxicity and environmental friendliness have begun to be developed,showing great potential in biomedical applications.The high-quality synthesis of eco-friendly QDs and the appropriate surface modification are key to realize their applications.This review summarizes the progress of eco-friendly QDs for biomedical applications,including their designed preparation,optical properties,surface modification,toxicity,and their applications in bioimaging and diagnostics.Finally,the challenges of eco-friendly QDs for future bioimaging and diagnostics application were provided.We believe this review will provide important guidance for promoting the development of eco-friendly QDs in bioimaging and diagnostics.
基金Acknowledgements This work was financially supported by the National Natural Science Foundation of China （Nos. 51222201, 51290272, 51472008, and 51432002）, the National Basic Research Program of China （Nos. 2012CB921404, 2013CB932603, 2012CB933404, and 2011CB921903）, and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China （No. 51121091）.
文摘Transferring MoS2 films from growth substrates onto target substrates is a critical issue for their practical applications. Moreover, it remains a great challenge to avoid sample degradation and substrate destruction, because the current transfer method inevitably employs a wet chemical etching process. We developed an etching-free transfer method for transferring MoS2 films onto arbitrary substrates by using ultrasonication. Briefly, the collapse of ultrasonication-generated microbubbles at the interface between polymer-coated MoS2 film and substrates induce sufficient force to delaminate the MoS2 films. Using this method, the MoS2 films can be transferred from all substrates （silica, mica, strontium titanate, and sapphire） and retains the original sample morphology and quality. This method guarantees a simple transfer process and allows the reuse of growth substrates, without involving any hazardous etchants. The etching-free transfer method is likely to promote broad applications of MoS2 in photodetectors.
