期刊文献+
共找到147篇文章
< 1 2 8 >
每页显示 20 50 100
COVID-19 mortality paradox(United States vs Africa):Mass vaccination vs early treatment
1
作者 Mina Thabet Kelleni 《World Journal of Experimental Medicine》 2024年第1期6-12,共7页
The coronavirus disease 2019(COVID-19)mortality rate in 55 African countries is almost 4.5 times lower than in the coronavirus disease 2019(COVID-19)despite Africa having over 4.2 times more people.This mortality para... The coronavirus disease 2019(COVID-19)mortality rate in 55 African countries is almost 4.5 times lower than in the coronavirus disease 2019(COVID-19)despite Africa having over 4.2 times more people.This mortality paradox is also evident when comparing Nigeria,a heavily populated,poorly vaccinated and weakly mandated country to Israel,a small,highly vaccinated and strictly mandated country.Nigeria has almost 4 times lower COVID mortality than Israel.In this Field of Vision perspective,I explain how this paradox has evolved drawing upon my academic,clinical and social experience.Since April 2020,I’ve developed and been using the Egyptian immune-modulatory Kelleni’s protocol to manage COVID-19 patients including pediatric,geriatric,pregnant,immune-compromised and other individuals suffering from multiple comorbidities.It’s unfortunate that severe acute respiratory syndrome coronavirus 2 is still evolving accompanied by more deaths.However in Africa,we’ve been able to live without anxiety or mandates throughout the pandemic because we trust science and adopted early treatment using safe,and effective repurposed drugs that have saved the majority of COVID-19 patients.This article represents an African and Egyptian tale of honor. 展开更多
关键词 COVID-19 Early treatment Kelleni’s Protocol Mandates Mortality paradox sARs-CoV-2 Nucleic acid based vaccines
下载PDF
Solving the Olbers’s Paradox, Explaining the “Red-Shift”, and Challenging the Relativities by “Sun Matters Theory” and “Sun Model of Universe”, an Evolution of the Einstein’s Static Universe Model
2
作者 Wanpeng Sun 《Natural Science》 2024年第2期7-18,共12页
Olbers’s paradox, known as the dark night paradox, is an argument in astrophysics that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe. Big-Bang theory was used ... Olbers’s paradox, known as the dark night paradox, is an argument in astrophysics that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe. Big-Bang theory was used to partially explain this paradox, while introducing new problems. Hereby, we propose a better theory, named Sun Matters Theory, to explain this paradox. Moreover, this unique theory supports and extended the Einstein’s static universe model proposed by Albert Einstein in 1917. Further, we proposed our new universe model, “Sun Model of Universe”. Based on the new model and novel theory, we generated innovative field equation by upgrading Einstein’s Field Equation through adding back the cosmological constant, introducing a new variable and modifying the gravitationally-related concepts. According to the Sun Model of Universe, the dark matter and dark energy comprise the so-called “Sun Matters”. The observed phenomenon like the red shift is explained as due to the interaction of ordinary light with Sun Matters leading to its energy and frequency decrease. In Sun Model, our big universe consists of many universes with ordinary matter at the core mixed and surrounded with the Sun Matters. In those universes, the laws of physics may be completely or partially different from that of our ordinary universe with parallel civilizations. The darkness of night can be easily explained as resulting from the interaction of light with the Sun Matters leading to the sharp decrease in the light intensity. Sun Matters also scatter the light from a star, which makes it shining as observed by Hubble. Further, there is a kind of Sun Matters named “Sun Waters”, surrounding every starts. When lights pass by the sun, the Sun Waters deflect the lights to bend the light path. According to the Sun Model, it is the light bent not the space bent that was proposed in the theory of relativities. 展开更多
关键词 Olbers’s paradox sun Matters Theory sun Model of Universe Einstein’s Universe Dark Mass
下载PDF
具有稚虫迁徙机制的S型自适应混沌蜉蝣算法
3
作者 张恒齐 钱谦 《化工自动化及仪表》 CAS 2024年第2期262-273,共12页
针对蜉蝣优化算法(MA)全局搜索能力较弱,对子代优秀个体有效信息利用不够充分的缺点,以及在计算中后期易陷入局部收敛,进而影响优化效果的问题,提出一种具有稚虫迁徙机制的S型自适应混沌蜉蝣优化算法(S-AMA)。S-AMA算法首先采用Logisti... 针对蜉蝣优化算法(MA)全局搜索能力较弱,对子代优秀个体有效信息利用不够充分的缺点,以及在计算中后期易陷入局部收敛,进而影响优化效果的问题,提出一种具有稚虫迁徙机制的S型自适应混沌蜉蝣优化算法(S-AMA)。S-AMA算法首先采用Logistic混沌映射产生蜉蝣种群,增加算法初期种群的多样性;随后,将蜉蝣生命周期进行数学建模,并引入S型生命系数替换原有的重力惯性系数,动态调整算法探索能力和开发能力间的平衡性;最后,根据蜉蝣在缺氧环境下的种群活动,引入稚虫迁徙机制强化子代优秀个体摆脱局部最优的能力,进而更加充分地搜索最优解附近的区域,以增强算法的收敛精度。实验部分将S-AMA应用于标准函数测试集,并分别进行优化对比实验、Wilcoxon秩和检验。结果表明:与对比算法相比,S-AMA算法具有更好的寻优能力、收敛速度及鲁棒性。 展开更多
关键词 s型自适应混沌蜉蝣优化算法(s-AMA) 稚虫迁徙机制 混沌映射 s型生命系数 莱维飞行
下载PDF
Evaluation of Generalized Error Function via Fast-Converging Power Series
4
作者 Serdar Beji 《Advances in Pure Mathematics》 2024年第6期495-514,共20页
A generalized form of the error function, Gp(x)=pΓ(1/p)∫0xe−tpdt, which is directly associated with the gamma function, is evaluated for arbitrary real values of p>1and 0x≤+∞by employing a fast-converging power... A generalized form of the error function, Gp(x)=pΓ(1/p)∫0xe−tpdt, which is directly associated with the gamma function, is evaluated for arbitrary real values of p>1and 0x≤+∞by employing a fast-converging power series expansion developed in resolving the so-called Grandi’s paradox. Comparisons with accurate tabulated values for well-known cases such as the error function are presented using the expansions truncated at various orders. 展开更多
关键词 Generalized Error Function Gamma Function Grandi’s paradox Fast-Converging Power series
下载PDF
Levi′s品牌的历史与发展 被引量:1
5
作者 郁彬 杨以雄 《国外纺织技术(纺织针织服装化纤染整)》 2003年第2期1-2,共2页
关键词 levis品牌 发展历史 levis公司 销售策略 中国市场 成衣公司 服装品牌
下载PDF
Resolution of Grandi’s Paradox as Extended to Complex Valued Functions 被引量:2
6
作者 Serdar Beji 《Advances in Pure Mathematics》 2020年第8期447-463,共17页
Grandi’s paradox, which was posed for a real function of the form <span style="white-space:nowrap;">1/(1+ <em>x</em>)</span>, has been resolved and extended to complex valued functio... Grandi’s paradox, which was posed for a real function of the form <span style="white-space:nowrap;">1/(1+ <em>x</em>)</span>, has been resolved and extended to complex valued functions. Resolution of this approximately three-hundred-year-old paradox is accomplished by the use of a consistent truncation approach that can be applied to all the series expansions of Grandi-type functions. Furthermore, a new technique for improving the convergence characteristics of power series with alternating signs is introduced. The technique works by successively averaging a series at different orders of truncation. A sound theoretical justification of the successive averaging method is demonstrated by two different series expansions of the function <span style="white-space:nowrap;">1/(1+ e<sup><em>x</em> </sup>)</span> . Grandi-type complex valued functions such as <span style="white-space:nowrap;">1/(<em>i</em> + <em>x</em>)</span> are expressed as consistently-truncated and convergence-improved forms and Fagnano’s formula is established from the series expansions of these functions. A Grandi-type general complex valued function <img src="Edit_f4efd7cd-6853-4ca4-b4dc-00f0b798c277.png" width="80" height="24" alt="" /> is introduced and expanded to a consistently truncated and successively averaged series. Finally, an unorthodox application of the successive averaging method to polynomials is presented. 展开更多
关键词 Grandi’s paradox Real and Complex Valued Functions series Expansions
下载PDF
The seeming paradox of adenosine receptors as targets for the treatment of Alzheimer's disease: agonists or antagonists? 被引量:1
7
作者 Rubina Marzagalli Alessandro Castorina 《Neural Regeneration Research》 SCIE CAS CSCD 2015年第2期205-207,共3页
Alzheimer's disease (AD) is the most common neurodegenerative disorder, and its incidence is relatively high among elderly people, affecting about 1-2% of the population between 60-65 years old and rising dramatica... Alzheimer's disease (AD) is the most common neurodegenerative disorder, and its incidence is relatively high among elderly people, affecting about 1-2% of the population between 60-65 years old and rising dramatically (about 30%) in people aged 80 years or older (Selkoe, 2002). Nowadays, considering the increasing mean lifespan of populations in developed countries, the disease is becoming more and more a health concern, and the search for an effective cure has turned into"a real need". 展开更多
关键词 The seeming paradox of adenosine receptors as targets for the treatment of Alzheimer’s disease agonists or antagonists
下载PDF
Parrondo's paradox for chaos control and anticontrol of fractional-order systems
8
作者 Marius-F Danca Wallace K S Tang 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第1期507-513,共7页
We present the generalized forms of Parrondo's paradox existing in fractional-order nonlinear systems. The gener- alization is implemented by applying a parameter switching (PS) algorithm to the corresponding initi... We present the generalized forms of Parrondo's paradox existing in fractional-order nonlinear systems. The gener- alization is implemented by applying a parameter switching (PS) algorithm to the corresponding initial value problems associated with the fractional-order nonlinear systems. The PS algorithm switches a system parameter within a specific set of N 〉 2 values when solving the system with some numerical integration method. It is proven that any attractor of the concerned system can be approximated numerically. By replacing the words "winning" and "loosing" in the classical Parrondo's paradox with "order" and "chaos", respectively, the PS algorithm leads to the generalized Parrondo's paradox: chaos1 + chaos2 +..- + chaosN = order and order1 + order2 +.-. + orderN = chaos. Finally, the concept is well demon- strated with the results based on the fractional-order Chen system. 展开更多
关键词 Parrondo's paradox chaos control parameter switching algorithm fractional-order Chen system
下载PDF
Large eustachian valve fostering paradoxical thromboembolism:passive bystander or serial partner in crime?
9
作者 Eustaquio Maria Onorato 《World Journal of Cardiology》 2021年第7期204-210,共7页
Catheter-based closure of patent foramen ovale(PFO)is more effective than medical therapy in the prevention of recurrent stroke[1].It is likely that a proportion of patients evaluated for potential transcatheter PFO c... Catheter-based closure of patent foramen ovale(PFO)is more effective than medical therapy in the prevention of recurrent stroke[1].It is likely that a proportion of patients evaluated for potential transcatheter PFO closure has actually different anatomical variants particularly common in the right atrium such as eustachian valve,Chiari network,Thebesian valve and Crista Terminalis.Notably,the eustachian valve may represent an increased risk factor for left circulation thromboembolism beyond that associated with PFO size and shunting.Such patients may benefit the most from percutaneous closure procedure. 展开更多
关键词 Eustachian valve Chiari’s network Patent foramen ovale Right-to-left shunt paradoxical embolism ECHOCARDIOGRAPHY
下载PDF
A Resolution of the Black Hole Information Paradox via Transfinite Set Theory
10
作者 Mohamed S. El Naschie 《World Journal of Condensed Matter Physics》 2015年第4期249-260,共12页
A black hole is essentially a relativistic as well as a quantum object. Therefore the information paradox of black holes is a consequence of the clash between these two most fundamental theories of modern physics. It ... A black hole is essentially a relativistic as well as a quantum object. Therefore the information paradox of black holes is a consequence of the clash between these two most fundamental theories of modern physics. It is logical to conclude that a resolution of the problem requires some form of a quantum gravity theory. The present work proposes such a resolution using set theory and pointless spacetime geometry. 展开更多
关键词 Information paradox Black HOLEs s. Hawking G. 't Hooft L. susskind Transfinite set Theory NONCOMMUTATIVE Geometry Measure Concentration Dvoretzky’s Theorem DARK Energy CAsIMIR Effect Nano CAsIMIR Reactor
下载PDF
Radial Electric Field in Tokamak Plasmas as a Physical Consequence of Ehrenfest’s Paradox
11
作者 Romannikov Alexander 《Journal of Modern Physics》 2012年第10期1639-1646,共8页
A simplified form and some possible theoretical resolutions of the so-called Ehrenfest’s Paradox are described. A relation between physical consequences of this relativistic paradox and charge density ρ of tokamak p... A simplified form and some possible theoretical resolutions of the so-called Ehrenfest’s Paradox are described. A relation between physical consequences of this relativistic paradox and charge density ρ of tokamak plasma is shown. Plasma experiments which could resolve the Ehrenfest’s Paradox are presented. 展开更多
关键词 TOKAMAK Ehrenfest’s paradox
下载PDF
Resolution of Hardy’s Paradox within Spacetime Physics and the Ithaca Interpretation of Quantum Mechanics
12
作者 Mohamed S. El Naschie 《World Journal of Condensed Matter Physics》 2018年第2期23-29,共7页
By religiously adhering to physics in spacetime and taking the final verdict of N.D. Mermin’s Ithaca interpretation of quantum mechanics seriously, Hardy’s paradox is completely resolved. It is then concluded that l... By religiously adhering to physics in spacetime and taking the final verdict of N.D. Mermin’s Ithaca interpretation of quantum mechanics seriously, Hardy’s paradox is completely resolved. It is then concluded that logical and mathematically consistent physical theories must be put in spacetime related formalism such as noncommutative geometry and E-infinity theory to avoid quantum paradoxes. At a minimum, we should employ the philosophy behind consistent quantum interpretation such as that of the famous Ithaca interpretation of D. Mermin. 展开更多
关键词 Hardy’s paradox Mermin’s Ithaca Interpretation Hardy’s Quantum ENTANGLEMENT NONCOMMUTATIVE Geometry E-INFINITY Fractal-Cantorian sPACETIME GOLDEN Mean Number system
下载PDF
Levi’s
13
《计算机光盘软件与应用(COMPUTER ARTS数码艺术)》 2006年第6期94-95,共2页
从旧金山的金矿到伦敦的哈克逊广场(Hoxton Square),Levi’s品牌都是一流的。现在看看Graeme Aymer是如何解析这一品牌的发展过程的.
关键词 levi’s 服装 品牌 牛仔裤
下载PDF
牛仔经典传奇Levi’s秋冬精彩再现
14
《华夏人文地理》 2003年第10M期176-176,共1页
关键词 levi’s 牛仔 个性风采 进取精神
下载PDF
150多年从没想过的LEVT’S levi’s蓝牙耳机
15
作者 宿超 《大众数码》 2008年第4期92-92,共1页
1847年:18岁的Levi’s创办人Levi Strauss从德国移民美国。1853年:Levi Strauss在旧金山成立levi’s公司用帆布制成了第一条牛仔裤。2003年:levi’s成立150周年,以及牛仔裤诞生130周年。同年type1tm系列诞生。2008年小编我拿到了levi’... 1847年:18岁的Levi’s创办人Levi Strauss从德国移民美国。1853年:Levi Strauss在旧金山成立levi’s公司用帆布制成了第一条牛仔裤。2003年:levi’s成立150周年,以及牛仔裤诞生130周年。同年type1tm系列诞生。2008年小编我拿到了levi’s蓝牙耳机。没错,相信你看到的,levi’s蓝牙耳机。 展开更多
关键词 蓝牙耳机 LEVT’s levi’s 创办人 strauss 相信你 小编 时尚达人 塑料材质 标志
下载PDF
Coral reef ecological pump for gathering and retaining nutrients and exporting carbon:a review and perspectives
16
作者 Linbin Zhou Yehui Tan Liangmin Huang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2023年第6期1-15,共15页
How coral reefs with high productivity and biodiversity can flourish in oligotrophic tropical oceans has inspired substantial research on coral reef ecosystems.Increasing evidence shows that similar to water in an oas... How coral reefs with high productivity and biodiversity can flourish in oligotrophic tropical oceans has inspired substantial research on coral reef ecosystems.Increasing evidence shows that similar to water in an oasis in the desert,there are stable nutrient supplies to coral reefs in oligotrophic oceans.Here,with emphasis on the fluxes of organic matter,we summarize at the ecosystem level(1)the multiple input pathways of external nutrients,(2)the storage of nutrients in reef organisms,(3)the efficient retaining and recycling of dissolved and particulate organic matter within coral reef ecosystems,(4)the distinctly high phytoplankton productivity and biomass inside and near oceanic coral reefs,and(5)the export of reef-related organic carbon to adjacent open oceans.These properties enable coral reefs to function as ecological“pumps”for gathering nutrients across ecosystems and space,retaining and recycling nutrients within the ecosystem,supporting high phytoplankton productivity,and exporting organic carbon to adjacent open oceans.Particularly,the high phytoplankton productivity and biomass make waters around coral reefs potential hotspots of carbon export to ocean depths via the biological pump.We demonstrate that organic carbon influx is vital for coral reef ecosystems’carbon budget and carbon export.The concept of the coral reef ecological pump provides a framework to improve the understanding of the functioning of the coral reef ecosystem and its responses to disturbance.Prospects of the coral reef ecological pump in coral reef studies are discussed in changing oceans driven by human activities and global change in the Anthropocene. 展开更多
关键词 Darwin’s paradox coral reef NUTRIENTs coral reef ecological pump carbon export ocean carbon cycle
下载PDF
Levi′s 150年的经典
17
作者 李逵 Vivian 《中国服装(北京)》 2003年第19期84-86,共3页
说起Cowboy——牛仔,除了会想到那是美国西部史上最富有冒险精神的化身,还要联想到与他们坚韧耐磨的性格相依相伴的牛仔裤。从腰挎手枪、挥动马绳的牛仔到生活在最底层的肮脏的矿工、铁路工或伐木工,从穿上工装裤走向社会的一战后妇... 说起Cowboy——牛仔,除了会想到那是美国西部史上最富有冒险精神的化身,还要联想到与他们坚韧耐磨的性格相依相伴的牛仔裤。从腰挎手枪、挥动马绳的牛仔到生活在最底层的肮脏的矿工、铁路工或伐木工,从穿上工装裤走向社会的一战后妇女到身穿牛仔裤摇曳丰姿的玛莉莲·梦露,从20世纪90年代的街头时髦仔到戴墨镜下穿石磨蓝牛仔裤参加APEC会议的美国前总统克林顿,牛仔文明就像可口可乐一样不分等级贵贱的风摩全球,数来至今已走过了150年的历史,它已将人类纷繁的个性雷同在蓝调的斜纹粗布当中。你可以说Levi′s并不是牛仔裤的惟一,但它的确是牛仔裤永恒的经典。它的商业文化,某种程度上就印证着牛仔文明由个性时装成为主流时尚的精彩历程。 展开更多
关键词 levi’s COWBOY 牛仔裤 美国西部史 服装行业 发展创新
下载PDF
经典的创新——LEVI’S
18
作者 张宇 《中国服装(北京)》 2004年第4期88-89,共2页
品牌简介: 1853年,受到当时的淘金热吸引,Levi Strauss来到三藩市,他利用帆布制成第一条牛仔裤,由于牛仔裤十分耐用、耐磨及具高强韧度的特征,受到广大挖金工人的欢迎.就这样,Levi Strauss创办了世界上第一个牛仔公司--LEVI'SSTRAUS... 品牌简介: 1853年,受到当时的淘金热吸引,Levi Strauss来到三藩市,他利用帆布制成第一条牛仔裤,由于牛仔裤十分耐用、耐磨及具高强韧度的特征,受到广大挖金工人的欢迎.就这样,Levi Strauss创办了世界上第一个牛仔公司--LEVI'SSTRAUSS AND CO.从此,美国的牛仔文化开始了盛行整个世界的历程. 展开更多
关键词 美国 牛仔服装 levi’s 服装品牌 设计风格
下载PDF
时尚新主张 环保也疯狂——李维斯(Levi’s)环保牛仔风
19
《南腔北调》 2008年第9期91-91,共4页
李维斯(Levi’s)在牛仔服饰的世界里一直扮演着领导的地位。随着全球变暖议题日益发酵,绿色环保意识抬头,进而让流行风潮成为现代人崇尚向往的最新时尚,不论是吃的、用的,无一不环绕在这个发烧话题上。李维斯响应世界公民最关注的议题,... 李维斯(Levi’s)在牛仔服饰的世界里一直扮演着领导的地位。随着全球变暖议题日益发酵,绿色环保意识抬头,进而让流行风潮成为现代人崇尚向往的最新时尚,不论是吃的、用的,无一不环绕在这个发烧话题上。李维斯响应世界公民最关注的议题,推出的 Signature 系列,并且邀请到韩国人气影星宋承宪最新代言;女装仍是亚洲小天后蔡依林为 Levi’s Copper 打造潮流丹宁新视界,以吸引亚洲人更加认识Siqnature·"Green Collection"绿色丹宁系列商品。全系列使用在纯天然环境下生长、不含任何农药毒害、以及化学加工生产为号召的环保有机棉材质,搭配绿染色泽车缝线,与以椰子壳。 展开更多
关键词 李维斯 levi’s 流行风潮 再生金属 椰子壳 新视界 农药毒害 蔡依林 有机棉 丹宁
全文增补中
Hilbert’s First Problem and the New Progress of Infinity Theory
20
作者 Xijia Wang 《Journal of Applied Mathematics and Physics》 2023年第4期891-904,共14页
In the 19th century, Cantor created the infinite cardinal number theory based on the “1-1 correspondence” principle. The continuum hypothesis is proposed under this theoretical framework. In 1900, Hilbert made it th... In the 19th century, Cantor created the infinite cardinal number theory based on the “1-1 correspondence” principle. The continuum hypothesis is proposed under this theoretical framework. In 1900, Hilbert made it the first problem in his famous speech on mathematical problems, which shows the importance of this question. We know that the infinitesimal problem triggered the second mathematical crisis in the 17-18th centuries. The Infinity problem is no less important than the infinitesimal problem. In the 21st century, Sergeyev introduced the Grossone method from the principle of “whole is greater than part”, and created another ruler for measuring infinite sets. The discussion in this paper shows that, compared with the cardinal number method, the Grossone method enables infinity calculation to achieve a leap from qualitative calculation to quantitative calculation. According to Grossone theory, there is neither the largest infinity and infinitesimal, nor the smallest infinity and infinitesimal. Hilbert’s first problem was caused by the immaturity of the infinity theory. 展开更多
关键词 Hilbert’s First Problem Cardinal Numbers Method Grossone Method Continuum paradox Infinity Theory
下载PDF
上一页 1 2 8 下一页 到第
使用帮助 返回顶部