In Arrow’s General Possibility Theorem (GPT), social choice should be defined over allpairs of alternatives. In this paper, we generalize Arrow’s GPT to situations where choice over pairs ofalternatives may not be p...In Arrow’s General Possibility Theorem (GPT), social choice should be defined over allpairs of alternatives. In this paper, we generalize Arrow’s GPT to situations where choice over pairs ofalternatives may not be possible. This shows that Arrow’s GPT and related impossibility results canbe established without binariness of social choice.展开更多
The German philosopher Walter Benjamin,who died attempting to cross a border to escape persecution,described both the impossibility and the possibilities of translation[1].The impossibility is implicit in the very tit...The German philosopher Walter Benjamin,who died attempting to cross a border to escape persecution,described both the impossibility and the possibilities of translation[1].The impossibility is implicit in the very title of Benjamin's essay,Die Aufgabe desÜbersetzers.The German word Aufgabe can mean"task"or"endeavor"but also a"giving up"or"surrender."展开更多
Alice opened the door and found that it led into a small passage,not much larger than a rat⁃hole:she knelt down and looked along the passage into the loveliest garden you ever saw.How she longed to get out of that dar...Alice opened the door and found that it led into a small passage,not much larger than a rat⁃hole:she knelt down and looked along the passage into the loveliest garden you ever saw.How she longed to get out of that dark hall,and wander about among those beds of bright flowers and those cool fountains,but she could not even get her head through the doorway;“and even if my head would go through,”thought poor Alice,“it would be of very little use without my shoulders.Oh,how I wish I could shut up like a telescope!I think I could,if I only know how to begin.”For,you see,so many out⁃of⁃the⁃way things had happened lately,that Alice had begun to think that very few things indeed were really impossible.展开更多
Direct conversion of syngas to light olefins(STO)on bifunctional catalysts has garnered significant attention,yet a comprehensive understanding of the reaction pathway and reaction kinetics remains elusive.Herein,we t...Direct conversion of syngas to light olefins(STO)on bifunctional catalysts has garnered significant attention,yet a comprehensive understanding of the reaction pathway and reaction kinetics remains elusive.Herein,we theoretically addressed the kinetics of the direct STO reaction on typical ZnAl_(2)O_(4)/zeolite catalysts by establishing a complete reaction network,consisting of methanol synthesis and conversion,water gas shift(WGS)reaction,olefin hydrogenation,and other relevant steps.The WGS reaction occurs very readily on ZnAl_(2)O_(4) surface whereas which is less active towards alkane formation via olefin hydrogenation,and the latter can be attributed to the characteristics of the H_(2) heterolytic activation and the weak polarity of olefins.The driving effect of zeolite component towards CO conversion was demonstrated by microkinetic simulations,which is sensitive to reaction conditions like space velocity and reaction temperature.Under a fixed ratio of active sites between oxide and zeolite components,the concept of the“impossible trinity”of high CO conversion,high olefin selectivity,and high space velocity can thus be manifested.This work thus provides a comprehensive kinetic picture on the direct STO conversion,offering valuable insights for the design of each component of bifunctional catalysts and the optimization of reaction conditions.展开更多
佳能打印机广告"impossible made possible"有着显著的文体特征:一是语音方面,各种押韵被用到,如头韵、尾韵等;音调重音在末尾;元辅音的频繁重复使用。二是词汇方面,形容词占据着极大的比重;反义词possible与impossible强烈...佳能打印机广告"impossible made possible"有着显著的文体特征:一是语音方面,各种押韵被用到,如头韵、尾韵等;音调重音在末尾;元辅音的频繁重复使用。二是词汇方面,形容词占据着极大的比重;反义词possible与impossible强烈的对比效果。三是句法方面,过去简单小句的使用使句子短小精湛。四是语义方面,修辞手法—"重复"的使用。五是语篇方面,情态的精准把握与极性词的使用;语言组织时概念主位与述位精确的定位;口语与书面语的交替使用。基于以上文体特征,该广告大获成功。展开更多
The question of whether an ideal network exists with global scalability in its full life cycle has always been a first-principles problem in the research of network systems and architectures.Thus far,it has not been p...The question of whether an ideal network exists with global scalability in its full life cycle has always been a first-principles problem in the research of network systems and architectures.Thus far,it has not been possible to scientifically practice the design criteria of an ideal network in a unimorphic network system,making it difficult to adapt to known services with clear application scenarios while supporting the ever-growing future services with unexpected characteristics.Here,we theoretically prove that no unimorphic network system can simultaneously meet the scalability requirement in a full cycle in three dimensions—the service-level agreement(S),multiplexity(M),and variousness(V)—which we name as the“impossible SMV triangle”dilemma.It is only by transforming the current network development paradigm that the contradiction between global scalability and a unified network infrastructure can be resolved from the perspectives of thinking,methodology,and practice norms.In this paper,we propose a theoretical framework called the polymorphic network environment(PNE),the first principle of which is to separate or decouple application network systems from the infrastructure environment and,under the given resource conditions,use core technologies such as the elementization of network baselines,the dynamic aggregation of resources,and collaborative software and hardware arrangements to generate the capability of the“network of networks.”This makes it possible to construct an ideal network system that is designed for change and capable of symbiosis and coexistence with the generative network morpha in the spatiotemporal dimensions.An environment test for principle verification shows that the generated representative application network modalities can not only coexist without mutual influence but also independently match well-defined multimedia services or custom services under the constraints of technical and economic indicators.展开更多
quite 与 very 是英语中使用频率较高的两个副词,均表示“非常”之意,但其差异微妙,用法繁杂,因此有必要作一比较来发现规律,以便掌握。1.没有等级之分的形容词,如 perfect(完美的),impossible(不可能的),dead(死的),right(正确的),wro...quite 与 very 是英语中使用频率较高的两个副词,均表示“非常”之意,但其差异微妙,用法繁杂,因此有必要作一比较来发现规律,以便掌握。1.没有等级之分的形容词,如 perfect(完美的),impossible(不可能的),dead(死的),right(正确的),wrong(错误的),full(满的),empty(空的),sure(确信的),certain(肯定的)。展开更多
In this paper, linguistic methodology is suggested for approaching figures of speech formed due to shift of cognitive relations. First, requisite features, possible features and impossible features are proposed on the...In this paper, linguistic methodology is suggested for approaching figures of speech formed due to shift of cognitive relations. First, requisite features, possible features and impossible features are proposed on the basis of semantic analysis and their interrelationships and expressions are discussed. Then it is further argued that all figures formed due to shift of cognitive relation are expressed to accept an impossible feature; and there are four semantic forms to accept it: “zero distance/distanced”, “implicit/explicit”, “direct/indirect”, “positive/negative”. Finally, starting from the two approaches to figures we comment on the traditional idea of separating decoration and substance and the new idea of “function as form”.展开更多
Genetic transformation is a powerful biotechnology for introducing novel genes into economically important plants from distantly-related plants or even unrelated species such as microbes and animals.This feat is impos...Genetic transformation is a powerful biotechnology for introducing novel genes into economically important plants from distantly-related plants or even unrelated species such as microbes and animals.This feat is impossible to be achieved by conventional breeding techniques.Development of transgenic plants has been a controversial subject since 1971 when the first genetically modified organism（GMO）was developed（James and Krattiger1996）.展开更多
For China,one of its most important commitments is to realize its“3060”targets of achieving a CO_(2) emission peak by 2030 and carbon neutrality by 2060.However,for a developing country with heavy carbon utilization...For China,one of its most important commitments is to realize its“3060”targets of achieving a CO_(2) emission peak by 2030 and carbon neutrality by 2060.However,for a developing country with heavy carbon utilization,achieving carbon neutrality in a short period necessitates tough changes.This paper briefly introduces energy and electricity scenarios and analyzes the challenges based on the current power system in China.Moreover,it summarizes the six characteristics of China’s future power grid and highlights some partially representative projects in the country.展开更多
不定式是非谓语动词的一种,也是我们现阶段英语学习的重点。不定式到底有哪些用法呢?让我们从一些题目中来看一看吧。用法一:作主语It’s standard practice for a company like this one____a security officer.A.employed B.being emp...不定式是非谓语动词的一种,也是我们现阶段英语学习的重点。不定式到底有哪些用法呢?让我们从一些题目中来看一看吧。用法一:作主语It’s standard practice for a company like this one____a security officer.A.employed B.being employed C.to employ D.employs解析本题考查固定句型:It+be+n+for sb./sth.to do…,考点为不定式作主语,故答案为C。对不定式作主语的考查,常常以固定句型的形式出现,主要有以下5种句型:展开更多
This paper explored algebraic features of nonlinear parts in Serpent encryption algorithm and offered an 11-round Serpent-128 impossible differential algebraic attack through utilizing the method in constructing S-box...This paper explored algebraic features of nonlinear parts in Serpent encryption algorithm and offered an 11-round Serpent-128 impossible differential algebraic attack through utilizing the method in constructing S-box algebraic equations.The new method analyzed block ll-round Serpent with 2127 selected plaintexts and 2-29 bytes memory space at the same time of giving a new design principle of S-box anti-algebraic attack.展开更多
文摘In Arrow’s General Possibility Theorem (GPT), social choice should be defined over allpairs of alternatives. In this paper, we generalize Arrow’s GPT to situations where choice over pairs ofalternatives may not be possible. This shows that Arrow’s GPT and related impossibility results canbe established without binariness of social choice.
文摘The German philosopher Walter Benjamin,who died attempting to cross a border to escape persecution,described both the impossibility and the possibilities of translation[1].The impossibility is implicit in the very title of Benjamin's essay,Die Aufgabe desÜbersetzers.The German word Aufgabe can mean"task"or"endeavor"but also a"giving up"or"surrender."
文摘Alice opened the door and found that it led into a small passage,not much larger than a rat⁃hole:she knelt down and looked along the passage into the loveliest garden you ever saw.How she longed to get out of that dark hall,and wander about among those beds of bright flowers and those cool fountains,but she could not even get her head through the doorway;“and even if my head would go through,”thought poor Alice,“it would be of very little use without my shoulders.Oh,how I wish I could shut up like a telescope!I think I could,if I only know how to begin.”For,you see,so many out⁃of⁃the⁃way things had happened lately,that Alice had begun to think that very few things indeed were really impossible.
文摘Direct conversion of syngas to light olefins(STO)on bifunctional catalysts has garnered significant attention,yet a comprehensive understanding of the reaction pathway and reaction kinetics remains elusive.Herein,we theoretically addressed the kinetics of the direct STO reaction on typical ZnAl_(2)O_(4)/zeolite catalysts by establishing a complete reaction network,consisting of methanol synthesis and conversion,water gas shift(WGS)reaction,olefin hydrogenation,and other relevant steps.The WGS reaction occurs very readily on ZnAl_(2)O_(4) surface whereas which is less active towards alkane formation via olefin hydrogenation,and the latter can be attributed to the characteristics of the H_(2) heterolytic activation and the weak polarity of olefins.The driving effect of zeolite component towards CO conversion was demonstrated by microkinetic simulations,which is sensitive to reaction conditions like space velocity and reaction temperature.Under a fixed ratio of active sites between oxide and zeolite components,the concept of the“impossible trinity”of high CO conversion,high olefin selectivity,and high space velocity can thus be manifested.This work thus provides a comprehensive kinetic picture on the direct STO conversion,offering valuable insights for the design of each component of bifunctional catalysts and the optimization of reaction conditions.
文摘佳能打印机广告"impossible made possible"有着显著的文体特征:一是语音方面,各种押韵被用到,如头韵、尾韵等;音调重音在末尾;元辅音的频繁重复使用。二是词汇方面,形容词占据着极大的比重;反义词possible与impossible强烈的对比效果。三是句法方面,过去简单小句的使用使句子短小精湛。四是语义方面,修辞手法—"重复"的使用。五是语篇方面,情态的精准把握与极性词的使用;语言组织时概念主位与述位精确的定位;口语与书面语的交替使用。基于以上文体特征,该广告大获成功。
基金supported by the National Key Research and Development Program of China(2022YFB2901403)the Songshan Laboratory Project(221100210900-02).
文摘The question of whether an ideal network exists with global scalability in its full life cycle has always been a first-principles problem in the research of network systems and architectures.Thus far,it has not been possible to scientifically practice the design criteria of an ideal network in a unimorphic network system,making it difficult to adapt to known services with clear application scenarios while supporting the ever-growing future services with unexpected characteristics.Here,we theoretically prove that no unimorphic network system can simultaneously meet the scalability requirement in a full cycle in three dimensions—the service-level agreement(S),multiplexity(M),and variousness(V)—which we name as the“impossible SMV triangle”dilemma.It is only by transforming the current network development paradigm that the contradiction between global scalability and a unified network infrastructure can be resolved from the perspectives of thinking,methodology,and practice norms.In this paper,we propose a theoretical framework called the polymorphic network environment(PNE),the first principle of which is to separate or decouple application network systems from the infrastructure environment and,under the given resource conditions,use core technologies such as the elementization of network baselines,the dynamic aggregation of resources,and collaborative software and hardware arrangements to generate the capability of the“network of networks.”This makes it possible to construct an ideal network system that is designed for change and capable of symbiosis and coexistence with the generative network morpha in the spatiotemporal dimensions.An environment test for principle verification shows that the generated representative application network modalities can not only coexist without mutual influence but also independently match well-defined multimedia services or custom services under the constraints of technical and economic indicators.
文摘quite 与 very 是英语中使用频率较高的两个副词,均表示“非常”之意,但其差异微妙,用法繁杂,因此有必要作一比较来发现规律,以便掌握。1.没有等级之分的形容词,如 perfect(完美的),impossible(不可能的),dead(死的),right(正确的),wrong(错误的),full(满的),empty(空的),sure(确信的),certain(肯定的)。
文摘In this paper, linguistic methodology is suggested for approaching figures of speech formed due to shift of cognitive relations. First, requisite features, possible features and impossible features are proposed on the basis of semantic analysis and their interrelationships and expressions are discussed. Then it is further argued that all figures formed due to shift of cognitive relation are expressed to accept an impossible feature; and there are four semantic forms to accept it: “zero distance/distanced”, “implicit/explicit”, “direct/indirect”, “positive/negative”. Finally, starting from the two approaches to figures we comment on the traditional idea of separating decoration and substance and the new idea of “function as form”.
文摘Genetic transformation is a powerful biotechnology for introducing novel genes into economically important plants from distantly-related plants or even unrelated species such as microbes and animals.This feat is impossible to be achieved by conventional breeding techniques.Development of transgenic plants has been a controversial subject since 1971 when the first genetically modified organism（GMO）was developed（James and Krattiger1996）.
基金supported by the SGCC(State Grid Corporation of China)technology project Analysis of System Stability Region and Control Strategy Based on Lyapunov Method(No.5100-202155304A-0-0-00).
文摘For China,one of its most important commitments is to realize its“3060”targets of achieving a CO_(2) emission peak by 2030 and carbon neutrality by 2060.However,for a developing country with heavy carbon utilization,achieving carbon neutrality in a short period necessitates tough changes.This paper briefly introduces energy and electricity scenarios and analyzes the challenges based on the current power system in China.Moreover,it summarizes the six characteristics of China’s future power grid and highlights some partially representative projects in the country.
文摘不定式是非谓语动词的一种,也是我们现阶段英语学习的重点。不定式到底有哪些用法呢?让我们从一些题目中来看一看吧。用法一:作主语It’s standard practice for a company like this one____a security officer.A.employed B.being employed C.to employ D.employs解析本题考查固定句型:It+be+n+for sb./sth.to do…,考点为不定式作主语,故答案为C。对不定式作主语的考查,常常以固定句型的形式出现,主要有以下5种句型:
基金Supported by the Natural Science Foundation of Hubei Province(Q20102905)
文摘This paper explored algebraic features of nonlinear parts in Serpent encryption algorithm and offered an 11-round Serpent-128 impossible differential algebraic attack through utilizing the method in constructing S-box algebraic equations.The new method analyzed block ll-round Serpent with 2127 selected plaintexts and 2-29 bytes memory space at the same time of giving a new design principle of S-box anti-algebraic attack.
