搜索到17056篇“ HYPOTHESIS“的相关文章
大学生“蹲考族”现象研究:理性人假设的视角
2025年
近年来,大学生就业形势日益严峻,越来越多的失业大学生选择了“蹲考”。访谈和问卷调查发现,蹲考族表现为以自愿性蹲考为主、获得家庭支持、期望到体制内单位和大城市或家乡城市就业等特征。从理性人假设的角度来看,蹲考族现象的原因在于蹲考的预期收益大于预期成本。严峻的就业形势降低了蹲考的机会成本,家庭的支持增强了蹲考族对经济成本和心理成本的承受能力;蹲考的预期收益包括更多的就业机会和更高的就业质量。蹲考是失业大学生为了实现预期收益最大化的理性选择,是一种人力资本投资行为,体现了一种自立自强的奋斗精神和人生态度,无法也无必要完全消除。应对蹲考族现象的解决思路在于:提高其考试成功概率,提高大学生就业率和就业质量。
吴克明欧阳奥琪冯帮
关键词:理性人假设人力资本投资大学生就业代际流动
均值回归过程扰动下具双重流行假设的随机SIS流行病模型
2025年
考虑一类非线性发病率下双重流行假设的随机SIS流行病模型。首先,通过对传播率进行均值回归过程下的扰动,建立随机模型;其次,从理论上证明了随机模型具有唯一的全局正解;再次,通过构造李雅普诺夫函数,得到两种传染病灭绝的充分条件。最后证明了:当R^(*)_(1)>1、R′_(2)<1时,疾病I_(1)持久,疾病I_(2)灭绝;当R′_(1)<1、R^(*)_(2)>1时,疾病I_(2)持久,疾病I_(1)灭绝;当R^(*)_(1)>1、R^(*)_(2)>1时,疾病I_(1)和I_(2)均持久。
李佳琦林玉国
关键词:SIS模型李雅普诺夫函数
基于脾虚毒损胃络假说探讨慢性萎缩性胃炎伴肠上皮化生的防治
2025年
胃癌前病变(Precancerous lesion of gastric cancer,PLGC)是从正常胃黏膜向胃癌转化过程的一个重要阶段,具有病程长、难治愈的特点,慢性萎缩性胃炎(Chronic atrophic gastritis,CAG)伴胃黏膜病理肠上皮化生(Intestinal metaplasia,IM)是该阶段较常见的病理变化。现代研究表明,中医药对PLGC的黏膜萎缩和肠化生具有重要延缓作用,甚至可以逆转其进展。“毒邪”贯穿于CAG病变之始终,文章基于“脾虚毒损胃络”假说,认为脾胃虚弱、痰湿瘀毒互结为CAG伴肠上皮化生的重要病机;从毒论治,将健脾解毒法用于慢性萎缩性胃炎伴肠上皮化生的防治,可为临床提供新的思路与方法。
王毅刘冬梅
关键词:胃脘痛慢性萎缩性胃炎毒邪肠上皮化生
Definite Answer for Riemann Hypothesis Zeta 3/2 Function Provided by New Material Yb2Si2O7 in Quantum Mechanics
2024年
This paper indicates the problem of the famous Riemann hypothesis (RH), which has been well-verified by a definite answering method using a Bose-Einstein Condensate (BEC) phase. We adopt mathematical induction, mappings, and laser photons governed by electromagnetically induced transparency (EIT) to examine the existence of the RH. In considering the well-developed as Riemann zeta function, we find that the existence of RH has a corrected and self-consistent solution. Specifically, there is the only one pole at s = 1 on the complex plane for Riemann’s functions, which generalizes to all non-trivial zeros while s > 1. The essential solution is based on the BEC phases and on the nature of the laser photon(s). This work also incorporates Heisenberg commutators [ x^,p^]=1/2in the field of quantum mechanics. We found that a satisfactory solution for the RH would be incomplete without the formalism of Heisenberg commutators, BEC phases, and EIT effects. Ultimately, we propose the application of qubits in connection with the RH.
Hung-Te Henry SuPo-Han Lee
关键词:EITQUBITS
The GBR Hypothesis Revisited
2024年
The radical hypothesis concerning the physics of gravitational black-body radiation is placed on a more solid statistical mechanics foundation in this study. As the concepts and formalism in the former presentation are only partially developed and furthermore, suffer from an unfortunate misstep regarding Hawking radiation and the hypothetical gravitational black-body temperature of a parcel or distribution of energy;this paper aims to fill in some of the theoretical gaps in the derivation of the Planck radiation formula for gravity (or non-Euclidean space-time), and there by provide a more complete and transparent quantum theory of thermal gravitational radiation.
Lewis Nash
关键词:GRAVITONS
A Dark Energy Hypothesis I
2024年
The cosmological constant, Λ, represents dark energy. The dark energy hypothesis (DEH) replaces Λ with a variable quantity, the cosmological parameter: Λ=1a2η2In this formula, “a” is the scale factor and η the conformal time: adη = cdt. A companion paper (DEH II) develops and explores a cosmological model with this variable parameter. This paper portrays the origin of the cosmological parameter in the uncoupling of time and space in the early universe from a prior state in which the comoving coordinates x0 = η and x1 = χ, the cosmic latitude, are coupled. In this hypothesis dark matter is a co-product of the decoupling, but its nature remains mysterious.
James Togeas
A Dark Energy Hypothesis II
2024年
The article develops a cosmological model based on a hypothesis that dark energy is a cosmological variable rather than a constant. A companion paper (DEH I) derives a formula for this variable cosmological parameter as well as an argument that the early universe produces it and dark matter. The developed model leads to a series of self-consistent results including a prediction that provides a test for it. The results include comparisons of the DEH and the ΛCDM theory.
James Togeas
A test of the species confidence hypothesis in dusky damselfish
2024年
Visual cues are important in both interspecific and intraspecific communication.The species confidence hypothesis proposes that animals are more attracted to conspecific colors and repelled by colors,not on their bodies.Studies on terrestrial lizards and birds have tested the species confidence hypothesis and shown that conspecific colors elicit reduced antipredator behavior.To date,the species confidence hypothesis has not been tested in the marine environment,specifically on coral reefs where color communication is of vital importance.We addressed this knowledge gap by measuring flight initiation distance(the distance an individual moves away from an approaching threat)in dusky damselfish(Stegastes nigricans)in response to an approaching disc of 1 of 4 different color treatments:conspecific,blue,yellow,and black.If the species confidence hypothesis explained variation in damselfish flight initiation distance,then we expected individuals to tolerate closer approaches when approached by a conspecific color.In addition,we calculated the color difference between each stimulus and its corresponding back-ground as a potential alternative explanation for flight responses.Damselfish tolerated the closest approach from the conspecific color stimulus;there were no significant differences between other colors and there was no support for the alternative color difference hypothesis.As with similar terrestrial studies,these results are relevant to ecotourists'choice of swimsuit and wetsuit colors because color choice may modify naturalantipredatorbehavior.
Elle OversSydney StumpIsabel SeverinoDaniel T.Blumstein
Major depressive disorder:hypothesis,mechanism,prevention and treatment被引量:6
2024年
Worldwide,the incidence of major depressive disorder(MDD)is increasing annually,resulting in greater economic and social burdens.Moreover,the pathological mechanisms of MDD and the mechanisms underlying the effects of pharmacological treatments for MDD are complex and unclear,and additional diagnostic and therapeutic strategies for MDD still are needed.The currently widely accepted theories of MDD pathogenesis include the neurotransmitter and receptor hypothesis,hypothalamicpituitary-adrenal(HPA)axis hypothesis,cytokine hypothesis,neuroplasticity hypothesis and systemic influence hypothesis,but these hypothesis cannot completely explain the pathological mechanism of MDD.Even it is still hard to adopt only one hypothesis to completely reveal the pathogenesis of MDD,thus in recent years,great progress has been made in elucidating the roles of multiple organ interactions in the pathogenesis MDD and identifying novel therapeutic approaches and multitarget modulatory strategies,further revealing the disease features of MDD.Furthermore,some newly discovered potential pharmacological targets and newly studied antidepressants have attracted widespread attention,some reagents have even been approved for clinical treatment and some novel therapeutic methods such as phototherapy and acupuncture have been discovered to have effective improvement for the depressive symptoms.In this work,we comprehensively summarize the latest research on the pathogenesis and diagnosis of MDD,preventive approaches and therapeutic medicines,as well as the related clinical trials.
Lulu CuiShu LiSiman WangXiafang WuYingyu LiuWeiyang YuYijun WangYong TangMaosheng XiaBaoman Li
关键词:PREVENTIONACUPUNCTUREHYPOTHESIS
The Proof Dilemma of Porter’s Hypothesis:Analysis of Its Verification Difficulties
2024年
The Porter Hypothesis,proposed by Michael E.Porter,suggests that stringent environmental regulations can enhance corporate innovation and competitiveness,challenging the traditional view that regulations increase business costs.It argues that regulations motivate firms to innovate,leading to improved productivity,cost reductions,and new market opportunities.However,there are proponents and critics in academia regarding the hypothesis.Supporters claim regulations change corporate behavior,reducing agency costs and boosting research and development.Critics argue that if win-win situations exist,businesses would naturally pursue them without regulatory incentives.Key challenges in proving or refuting the hypothesis include its various versions,the difficulty in quantifying innovation and competitiveness,the complex interplay between regulation,innovation,and competitiveness,and the varying impacts across industries and regions.Additionally,the effects may require a long time to manifest,and the hypothesis’s applicability is influenced by evolving environmental policies and market environments.Despite mixed empirical findings,the Porter Hypothesis provides a valuable framework for understanding the relationships among environmental regulation,innovation,and competitiveness,but its validation requires a more comprehensive assessment.
Zhiyao HuangJiajie Qu
关键词:INNOVATE

相关作者

邱林林
作品数:7被引量:2H指数:1
供职机构:北京物资学院
研究主题:CONSTRUCTION SYNTACTIC RESEARCH 礼貌原则 委婉语
滕越
作品数:5被引量:5H指数:1
供职机构:河北建材职业技术学院
研究主题:高等职业院校 高职英语 教学实现 全人教育观 人文素质培养
严佳佳
作品数:5被引量:6H指数:1
供职机构:闽南师范大学
研究主题:语法教学 初中英语语法 初中英语 TPR教学法 METHODS
罗冬梅
作品数:1被引量:1H指数:1
供职机构:广东外语外贸大学
研究主题:KRASHEN HYPOTHESIS EXPERIMENTAL_STUDY 二语阅读 可理解性输入
黄一平
作品数:6被引量:7H指数:2
供职机构:四川师范大学基础教学学院
研究主题:大学英语 文化 语言 英文 茶文化