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Mass Increase with Strong and Gravitational Potentials, and Mass Defect with Electromagnetic Potential
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作者 Hany Ali Hussein 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2024年第3期1079-1094,共16页
The proposal is “mass increases due to strong and gravitational potentials, while it decreases due to Electromagnetic potential”. This proposal explains the big difference in mass between hadrons (protons, neutrons,... The proposal is “mass increases due to strong and gravitational potentials, while it decreases due to Electromagnetic potential”. This proposal explains the big difference in mass between hadrons (protons, neutrons, & mesons) and their components (quarks), mass difference between nucleus and its individual components (protons and neutrons), massless of gamma photons, abnormal masses of mesons and bosons, and the excess in galaxy masses (dark matter). Also, this proposal shows the exact relation between mass and energy: Strong Potential=−3.04mc2| Electric Potential |=−5.57×10−3mc2Gravitational Potential=−1.22×10−7mc2where m represents the excess in mass due to strong potential, or gravitational potential and represents the decrease in mass due to electromagnetic potential. Released energy here equals potential energy and doesn’t equal decrease in mass using the formula E = mc2. Released energy is transferred to heat, photons, kinetic energy… Finally, proposal will try to describe the relation between photon energy and mass of its components using the general equation of kinetic energy: Photon Energy=1/2mc2m is the sum of the individual masses of its components, while the total mass of photon is zero. 展开更多
关键词 Mass Defect Dark Matter PHOTON Gamma Photon Strong Potential Gravitational Potential Electromagnetic Potential QUARKS Mesons BOSONS Deuterium Proton Neutron
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Median Nerve Somatosensory Evoked Potentials in Patients with Chiari Malformation
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作者 Mustafa Harun Sahin Gonul Vural +1 位作者 Serdar Barakli Sadiye Gumusyayla 《World Journal of Neuroscience》 CAS 2024年第1期24-32,共9页
Abnormal SEP reflects dysfunction of the medial lemniscus and posterior cervical cord. These structures are likely to be affected in Chiari malformation. Therefore, SEP abnormalities may provide valuable information i... Abnormal SEP reflects dysfunction of the medial lemniscus and posterior cervical cord. These structures are likely to be affected in Chiari malformation. Therefore, SEP abnormalities may provide valuable information in patients with CM. However, the consistency of SEP abnormality or normality with the damage is a matter of research. Knowing whether median nerve somatosensory evoked potential (SEP) is useful in revealing subclinical damage in patients with Chiari malformation is important in the treatment and follow-up plan of the disease. The aim of this study was to investigate the relationship between median nerve SEP values and the severity of cerebellar ectopia in patients with Chiari type 1 malformation. Median nerve SEP values were obtained from 30 healthy individuals and 146 individuals with Chiari malformation. The cerebellar ectopia degree and McRae line length were measured. SEP values were not significantly different between groups. The McRae line was found to be significantly shorter in the control group than in the Chiari malformation group (p = 0.031). There was no correlation between the degree of cerebellar ectopia and the length of the McRae line (r = 0.002, p = 0.979). Neither cerebellar ectopy degree nor McRae line length had a relationship with SEP values (r = -0.153, p = 0.066;r = -0.056, p = 0.500, respectively). There was no difference in cerebellar ectopy degree or SEP values between the groups with cerebellar ectopy with and without a syrinx (p = 0.899;p = 0.080, respectively). Likewise, McRae line length was not found to be related to the presence of a syrinx (p = 0.139). Median nerve SEP examination was not beneficial for diagnosing asymptomatic-oligosymptomatic Chiari malformation as a subclinical injury, whether accompanied by syringomyelia or not. 展开更多
关键词 Chiari Malformation Cerebellar Ectopy Somatosensory Evoked Potential
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Thermal conductivity of GeTe crystals based on machine learning potentials
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作者 张健 张昊春 +1 位作者 李伟峰 张刚 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期104-107,共4页
GeTe has attracted extensive research interest for thermoelectric applications.In this paper,we first train a neuroevolution potential(NEP)based on a dataset constructed by ab initio molecular dynamics,with the Gaussi... GeTe has attracted extensive research interest for thermoelectric applications.In this paper,we first train a neuroevolution potential(NEP)based on a dataset constructed by ab initio molecular dynamics,with the Gaussian approximation potential(GAP)as a reference.The phonon density of states is then calculated by two machine learning potentials and compared with density functional theory results,with the GAP potential having higher accuracy.Next,the thermal conductivity of a GeTe crystal at 300 K is calculated by the equilibrium molecular dynamics method using both machine learning potentials,and both of them are in good agreement with the experimental results;however,the calculation speed when using the NEP potential is about 500 times faster than when using the GAP potential.Finally,the lattice thermal conductivity in the range of 300 K-600 K is calculated using the NEP potential.The lattice thermal conductivity decreases as the temperature increases due to the phonon anharmonic effect.This study provides a theoretical tool for the study of the thermal conductivity of GeTe. 展开更多
关键词 machine learning potentials thermal conductivity molecular dynamics
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Clinical characteristics and analysis of vestibular-evoked myogenic potentials in patients with sudden sensorineural hearing loss in different ages
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作者 Yan-Zhuo Zhang Ya-Bo Wang +6 位作者 Jing-Lei Fang Yue-Tang Wang Gui-Fang Li Ran-Ran Liu Shu-Jing Shi Chun-Hua Wang Yong-Tao Tian 《World Journal of Clinical Cases》 SCIE 2024年第19期3760-3766,共7页
BACKGROUND Numerous studies have found that patients experiencing sudden sensorineural hearing loss(SSHL),with or without accompanying vertigo,often show impaired vestibular function.However,there is a dearth of studi... BACKGROUND Numerous studies have found that patients experiencing sudden sensorineural hearing loss(SSHL),with or without accompanying vertigo,often show impaired vestibular function.However,there is a dearth of studies analyzing vestibularevoked myogenic potentials(VEMPs)in SSHL patients across various age groups.AIM To investigate vestibular condition in SSHL patients across various age demographics.METHODS Clinical data of 84 SSHL patients were investigated retrospectively.Audiometry,cervical vestibular evoked myogenic potentials(c-VEMPs),and ocular vestibular evoked myogenic potentials(o-VEMPs)were conducted on these patients.Parameters assessed included the latencies of P1 and N1 waves,as well as the amplitudes of P1–N1 waves.Moreover,the study evaluated the influence of factors such as sex,affected side,configuration of hearing loss,and presence of accompanying vertigo.RESULTS Among the 84 SSHL patients,no significant differences were observed among the three groups in terms of gender,affected side,and the presence or absence of vertigo.Group II(aged 41–60 years)had the highest number of SSHL cases.The rates of absent o-VEMPs in the affected ears were 20.83%,31.58%,and 22.72%for the three age groups,respectively,with no statistically significant difference among them.The rates of absent c-VEMPs in the affected ears were 8.3%,34.21%,and 18.18%for the three age groups,respectively,with significant differences.In the unaffected ears,there were differences observed in the extraction rates of o-VEMPs in the unaffected ears among the age groups.In the three age groups,no significant differences were noted in the three age groups in the latencies of P1 and N1 waves or in the amplitude of N1–P1 waves for c-VEMPs and o-VEMPs,either on the affected side or on the unaffected side,across the three age groups.CONCLUSION The extraction rate of VEMPs is more valuable than parameters.Regardless of the presence of vertigo,vestibular organs are involved in SSHL.Notably,SSHL patients aged 41–60 appear more susceptible to damage to the inferior vestibular nerve and saccule. 展开更多
关键词 Sudden sensorineural hearing loss Cervical vestibular evoked myogenic potential Ocular vestibular evoked myogenic potential VERTIGO Pure tone audiometry
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Tetrathiafulvalene esters with high redox potentials and improved solubilities for non-aqueous redox flow battery applications
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作者 Weikang Hu Jiaqi Xu +3 位作者 Nanjie Chen Zongcai Deng Yuekun Lai Dongyang Chen 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第5期899-908,共10页
The exploitation of high performance redox-active substances is critically important for the development of non-aqueous redoxflow batteries.Herein,three tetrathiofulvalene(TTF)derivatives with different substitution gr... The exploitation of high performance redox-active substances is critically important for the development of non-aqueous redoxflow batteries.Herein,three tetrathiofulvalene(TTF)derivatives with different substitution groups,namely TTF diethyl ester(TTFDE),TTF tetramethyl ester(TTFTM),and TTF tetraethyl ester(TTFTE),are prepared and their energy storage properties are evaluated.It has been found that the redox potential and solubility of these TTF derivatives in conventional carbonate electrolytes increases with the number of ester groups.The battery with a catholyte of 0.2 mol L^(-1) of TTFTE delivers a specific capacity of more than 10 Ah L^(-1) at the current density of 0.5 C with two discharge voltage platforms locating at as high as 3.85 and 3.60 V vs.Li/Liþ.Its capacity retention can be improved from 2.34 Ah L^(-1) to 3.60 Ah L^(-1) after 100 cycles by the use of an anion exchange membrane to block the crossover of TTF species.The excellent cycling stability of the TIF esters is supported by their well-delocalized electrons,as revealed by the density function theory calculations.Therefore,the introduction of more and larger electron-withdrawing groups is a promising strategy to simultaneously increase the redox-potential and solubility of redox-active ma-terials for non-aqueous redoxflow batteries. 展开更多
关键词 Non-aqueous redox flow batteries Tetrathiofulvarene Redox potential SOLUBILITY Substituent effect
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The Aharonov-Bohm Effect: An Exploration of Quantum Interference and Electromagnetic Potentials
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作者 Bahman Zohuri 《Journal of Energy and Power Engineering》 CAS 2024年第3期79-87,共9页
The AB(Aharonov-Bohm)effect is a pivotal quantum mechanical phenomenon that illustrates the fundamental role of the electromagnetic vector potential A in determining the phase of a charged particle’s wave function,ev... The AB(Aharonov-Bohm)effect is a pivotal quantum mechanical phenomenon that illustrates the fundamental role of the electromagnetic vector potential A in determining the phase of a charged particle’s wave function,even in regions where the magnetic field B is zero.This effect demonstrates that quantum particles are influenced not only by the fields directly present but also by the potentials associated with those fields.In the AB effect,an electron beam is split into two paths,with one path encircling a solenoid and the other bypassing it.Despite the absence of a magnetic field in the regions traversed by the beams,the vector potential A associated with the magnetic flux Φ through the solenoid induces a phase shift in the electron’s wave function.This phase shift,quantified by △φ=qΦ/hc,manifests as a change in the interference pattern observed in the detection screen.The phenomenon underscores the principle of gauge invariance in QED(quantum electrodynamics),where physical observables remain invariant under local gauge transformations of the vector and scalar potentials.This reinforces the notion that the vector potential A has a profound impact on quantum systems,beyond its classical role.This article outlines the AB effect,including its theoretical framework,experimental observations,and implications.The focus on the role of the vector potential in quantum mechanics provides a comprehensive understanding of this important phenomenon. 展开更多
关键词 AB effect vector potential(A) magnetic flux(Φ) quantum phase shift gauge invariance electromagnetic potentials interference pattern scalar fields longitudinal waves QED
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Masseter Vestibular evoked myogenic potentials: A new tool to assess the vestibulomasseteric reflex pathway
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作者 Aishwarya Nagarajan Sujeet Kumar Sinha 《Journal of Otology》 CAS CSCD 2024年第1期46-54,共9页
Purpose: This review article provides the readers with an in-depth insight in understanding and interpreting various research literatures on the masseter vestibular evoked myogenic potentials(mVEMP). The article also ... Purpose: This review article provides the readers with an in-depth insight in understanding and interpreting various research literatures on the masseter vestibular evoked myogenic potentials(mVEMP). The article also reviews the contemporary researches involving the clinical applications of the mVEMP. Conclusions: Masseter VEMP is an evolving yet clinically promising neuro-otology test tool that has recently gained more research interest and is considered an additional tool to diagnose various vestibular disorders. Masseter VEMP assesses the functional integrity of the acoustic-masseteric and vestibulo-masseteric reflex pathways. The mVEMP could be used as a complementary test to evaluate the same peripheral generator as the cervical VEMP but a different central pathway i.e., vestibulo-trigeminal pathway. Various research studies that have experimented on parameters such as the effect of different electrode montages(zygomatic vs mandibular configurations), stimulation rates, filter settings and stimuli used to evoke mVEMP have been discussed in this article that could assist in the optimization of a comprehensive clinical protocol. The latency and the amplitude of mVEMP waveforms serve as significant parameters in differentiating normals from those of the clinical populations. Along with the cVEMPs and oVEMPs, mVEMP might help diagnose brainstem lesions in REM Sleep behaviour disorders, Multiple Sclerosis and Parkinson's disease. However, further studies are required to probe in this area of research. 展开更多
关键词 Masseter vestibular evoked myogenic potentials(mVEMP) Vestibulo-masseteric pathway Acoustic-masseteric pathway
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Entrepreneurship training:its influences on innovation potentials among nursing students
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作者 Asmaa Abdel Rahman Abdel Rahman Dalia Abdallah Abdelatief 《Frontiers of Nursing》 2024年第1期85-98,共14页
Objective:To evaluate the influences of entrepreneurship training on the innovation potential among nursing students.Methods:A quasi-experimental design was utilized to conduct this study.The study was conducted in th... Objective:To evaluate the influences of entrepreneurship training on the innovation potential among nursing students.Methods:A quasi-experimental design was utilized to conduct this study.The study was conducted in the classroom at the faculty of nursing,and the“i Hub”center at Ain Shams University(ASU)in Cairo,Egypt.A purposive sample of 42 nursing students who participated in the“Ain Shams University-innovate”competition from the Faculty of Nursing of ASU were included in this study.Data collection tools included(1)Nursing students'innovation skills assessment questionnaire and(2)Innovative projects evaluation tool.Results:There was a statistically significant difference between the mean scores of nursing students'total innovation skills pre-and post-implementation of entrepreneurship training,where P-value<0.05.Conclusions:The results of the current study support the research hypothesis because the implementation of entrepreneurship training positively affects nursing students'innovation potential.Developing entrepreneurship education in nursing and integrating it into nursing programs will stimulate creativity,innovation,and entrepreneurship among nursing students and health care services. 展开更多
关键词 entrepreneurship training innovation potentials nursing students creative skills energy/motivation
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洛河洛阳段沉积物重金属空间分布及潜在生态风险
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作者 刘德鸿 石兆勇 《河南师范大学学报(自然科学版)》 CAS 北大核心 2025年第1期57-65,共9页
为明晰洛河洛阳段沉积物重金属分布、风险及来源,以洛河洛阳段为研究对象,采集入城区段、主城区段和出城区段13个点位的表层沉积物,分析重金属(Pb、Cd、Cr、Mo、Cu和Zn)的空间分特征,并利用地累积指数(I geo)法、潜在生态风险指数(RI)... 为明晰洛河洛阳段沉积物重金属分布、风险及来源,以洛河洛阳段为研究对象,采集入城区段、主城区段和出城区段13个点位的表层沉积物,分析重金属(Pb、Cd、Cr、Mo、Cu和Zn)的空间分特征,并利用地累积指数(I geo)法、潜在生态风险指数(RI)法和主成分分析等方法评价重金属污染程度、潜在生态风险及来源解析,结果显示:洛河洛阳段沉积物重金属平均质量分数Pb(42.90 mg·kg^(-1))、Cd(2.41 mg·kg^(-1))、Cr(76.86 mg·kg^(-1))、Mo(9.31 mg·kg^(-1))、Cu(35.15 mg·kg^(-1))及Zn(145.60 mg·kg^(-1))分别为黄河流域河南段重金属元素土壤背景值的1.7、14.2、1.1、13.7、1.5和2.2倍.Pb、Cr和Cu质量分数均表现为入城区段显著高于出城区段,Cd、Mo和Zn表现为主城区段显著高于出城区段,这6种重金属质量分数在入城区段与主城区段间无显著差异.入城区段和主城区段多数点位的Cd为偏重污染程度及以上,Mo为中度污染或偏重污染程度,其余为轻度或低污染程度.源解析显示,Pb、Cd、Mo、Cu和Zn主要为人为源,Cr以自然源为主.潜在生态风险指数法结果显示,入城区点位达到强生态危害水平(Ⅲ级)及以上,主城区段所有点位均达到很强生态危害水平(Ⅳ级),出城区段所有点位均达到强生态危害水平(Ⅲ级),其中,Cd对RI的贡献最大,占比64.10%,其次是Mo(32.67%).洛阳市应重点关注由钼产业可能引起的环境风险,并进一步降低Cd污染水平,方能降低洛河沉积物重金属的污染及潜在生态风险. 展开更多
关键词 洛河 洛阳段 沉积物 重金属 潜在生态风险
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乌玛高速沙漠段风沙环境特征及格状沙丘移动规律
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作者 李良英 王振强 +3 位作者 王旭 辛国伟 李琦 吕乐乐 《水土保持研究》 北大核心 2025年第1期160-171,共12页
[目的]沙丘移动与风沙环境特征和沙丘形态具有直接关系,探究多种因素作用下的格状沙丘移动规律,能为沙区公路风沙防治提供科学依据。[方法]以乌玛高速沙漠段格状沙丘为研究对象,基于当地气象数据、Google Earth卫星影像,研究了2019-202... [目的]沙丘移动与风沙环境特征和沙丘形态具有直接关系,探究多种因素作用下的格状沙丘移动规律,能为沙区公路风沙防治提供科学依据。[方法]以乌玛高速沙漠段格状沙丘为研究对象,基于当地气象数据、Google Earth卫星影像,研究了2019-2021年乌玛高速沙漠段K167+300,K172+300,K177+300里程处风沙环境及格状沙丘的形态演变和移动规律。[结果](1)研究区年平均起沙风速介于6.07~6.84 m/s,春夏为主要输沙季节,主风向为西北风,次风向为东南风;年输沙势介于31.77~38.89 VU,方向变率指数(RDP/DP)介于0.73~0.78,属于低风能环境、中变率风况。(2)研究区自东北向西南方向,格状沙丘主梁向东偏移,副梁向南偏移,主副梁走向几乎保持垂直,沙丘形态整体上变化较小;格状沙丘的主副梁长度、主副梁间距、沙丘高度均呈现出增加的趋势,主副梁长度增长率、主副梁偏移率呈减小趋势。(3)沙丘移动方向介于140.43°~152.64°,与年RDD变化基本一致,即向东南偏移;沙丘平均高度介于5.24~8.31 m,沙丘移动速率介于2.31~2.86 m/a,两者表现为负相关关系。(4)输沙势、年均温度与沙丘移动速率为正相关关系,相较而言,年均温度对沙丘移动速率的影响更为显著;年均降水量、植被覆盖度与沙丘移动速率为负相关关系,其中年均降水量对移动速率的影响尤为重要。[结论]格状沙丘的移动与当地风况、降水量、温度、植被覆盖度及沙丘自身形态息息相关,其中输沙势及温度增加会加速沙丘前移,不利于对风沙的防治,而提高降水量及植被覆盖度,对防治沙丘移动引起的公路风沙灾害具有积极作用。 展开更多
关键词 格状沙丘 输沙势 空间插值 沙丘移动 形态演变
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中国土壤硼地球化学异常特征与找矿远景区预测
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作者 柳青青 王学求 +6 位作者 张必敏 周建 王玮 刘汉粮 刘东盛 周怡宁 常婵 《地学前缘》 北大核心 2025年第1期50-60,共11页
硼是一种新兴战略矿产,在现代高新技术产业中应用广泛。近年来,硼的需求持续上升,硼矿资源勘查也日益受到重视。本文依托中国地球化学基准值计划所采集的3380件汇水域深层土壤数据,提供了全国B元素地球化学分布和异常特征。全国汇水域... 硼是一种新兴战略矿产,在现代高新技术产业中应用广泛。近年来,硼的需求持续上升,硼矿资源勘查也日益受到重视。本文依托中国地球化学基准值计划所采集的3380件汇水域深层土壤数据,提供了全国B元素地球化学分布和异常特征。全国汇水域土壤深层样品B平均含量为46.4μg/g,B整体上具有南高北低、连片分布的特点,可划分为5个地球化学分区,分别为东北与内蒙古东部地区(Ⅰ)、西北部地区(Ⅱ)、华北地区(Ⅲ)、青藏地区(Ⅳ)和南方地区(Ⅴ)。以B含量70.9和52.4μg/g(累频85%)分别作为南北方异常下限,共圈定出37个B地球化学异常,在全国圈定10个地球化学省和9个小规模异常。根据B异常空间分布,结合地质背景和硼矿床分布,进一步划分出9个成矿远景区,建议加大盐湖型硼矿的找矿勘查力度,并将硬岩(海相沉积)型硼矿作为下一步勘查目标。 展开更多
关键词 中国地球化学基准 找矿远景区 深层土壤 地球化学异常
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高职护生述情障碍潜在剖面分析及影响因素
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作者 肖娟 吴思颖 +3 位作者 吴曼 孙雪芹 余颖 周健坤 《护理研究》 北大核心 2025年第2期225-230,共6页
目的:探索高职护生述情障碍潜在类别,并分析其影响因素。方法:采取便利抽样法,于2023年10月—11月纳入安徽省某高职院校2022级及2023级高职护生828人作为研究对象,采用一般资料调查表、中文版多伦多述情障碍量表、中文版人际反应指针问... 目的:探索高职护生述情障碍潜在类别,并分析其影响因素。方法:采取便利抽样法,于2023年10月—11月纳入安徽省某高职院校2022级及2023级高职护生828人作为研究对象,采用一般资料调查表、中文版多伦多述情障碍量表、中文版人际反应指针问卷进行调查。采用潜在剖面分析探索高职护生述情障碍潜在分型,确定其最佳分型,运用Logistic回归分析探讨述情障碍潜在类别的影响因素。结果:高职护生述情障碍可分为3个类别,其中非述情障碍或低危组62人(7.5%),述情障碍中危组351人(42.4%),述情障碍高危组415人(50.1%)。Logistic回归分析结果显示,家庭居住地、选择护理专业原因、共情能力是高职护生述情障碍潜在类别的影响因素(P<0.05)。结论:高职护生述情障碍存在异质性,护理教育者和教育管理者应及时识别存在述情障碍的高职护生,平衡发展共情能力,降低述情障碍水平。 展开更多
关键词 高职护生 述情障碍 共情能力 潜在剖面分析 影响因素
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影响突发自然灾害事件信息分享意愿的机制研究——基于信息来源与特质共情的视角
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作者 石蕊 胡宇涵 +1 位作者 刘畅 尚俊辰 《情报杂志》 北大核心 2025年第2期191-199,F0003,共10页
突发事件背景下的公众信息互动模式深刻塑造和引导舆情态势,尤其是突发自然灾害事件的高度不确定性和紧迫性不仅激发了公众复杂情绪,还极大地促进了多元信息主体的广泛参与与互动。该研究聚焦于特质共情和信息来源对突发自然灾害事件信... 突发事件背景下的公众信息互动模式深刻塑造和引导舆情态势,尤其是突发自然灾害事件的高度不确定性和紧迫性不仅激发了公众复杂情绪,还极大地促进了多元信息主体的广泛参与与互动。该研究聚焦于特质共情和信息来源对突发自然灾害事件信息分享行为决策的影响,深入剖析行为背后的神经机制以全面理解信息评估的复杂心理过程。基于事件相关电位(ERP)技术,该研究设计2信息来源(官方vs.非官方)×2特质共情(高vs.低)双因素混合脑电实验,探索性从神经生理层面分析不同来源的突发自然灾害事件信息在大脑认知加工过程中的神经响应模式,以及这些模式如何因个体特质共情差异而最终影响个体不同的分享决策。行为结果显示,在面对突发自然灾害事件信息时,所有被试对官方来源的信息表现出更高的分享意愿和更短的决策时间,且高特质共情被试信息分享倾向更为积极;ERP结果显示,在突发事自然灾害事件信息评估过程中,相较于低特质共情被试,高特质共情被试在额区及中央区表现出增强的P2脑电波幅,同时在该区域诱发的N400脑电波幅显著降低;非官方来源的信息则诱发更高的N400脑电波幅。该研究表明高特质共情个体对突发自然灾害事件信息更敏感,在信息加工的早期展现出显著的加工优势。官方来源的信息则在晚期信息加工阶段体现优势,表现为脑电活动的增强。 展开更多
关键词 突发自然灾害事件 信息分享 分享意愿 事件相关电位(ERP) 特质共情 信息来源
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心房颤动伴二尖瓣反流病人血清TRPC1、GDF-15水平与心房颤动类型、反流程度的关系
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作者 王妍 汪钰 马丹 《中西医结合心脑血管病杂志》 2025年第2期282-286,共5页
目的:分析心房颤动(AF)伴二尖瓣反流(MR)病人血清瞬时受体电位通道1(TRPC1)、生长分化因子-15(GDF-15)水平与心房颤动类型、反流程度的关系。方法:选取2020年2月—2022年2月我院收治的112例AF伴FMR病人作为研究组,同期选取103名健康体... 目的:分析心房颤动(AF)伴二尖瓣反流(MR)病人血清瞬时受体电位通道1(TRPC1)、生长分化因子-15(GDF-15)水平与心房颤动类型、反流程度的关系。方法:选取2020年2月—2022年2月我院收治的112例AF伴FMR病人作为研究组,同期选取103名健康体检者作为对照组。根据研究组心房颤动类型分为永久性心房颤动组(32例)、持续性心房颤动组(41例)和阵发性心房颤动组(39例);根据二尖瓣反流程度分为轻度MR组(44例)、中度MR组(42例)和重度MR组(26例)。所有研究对象均进行二维超声心动图检查,测量左房内径(LAD)、左室舒张末期内径(LVEDD)、左室收缩末期内径(LVESD)、左室射血分数(LVEF);采用酶联免疫吸附法(ELISA)检测各组血清TRPC1、GDF-15水平。Logistic回归分析诊断AF伴FMR病人的影响因素。结果:与对照组比较,研究组LAD、LVEDD、LVESD及血清TRPC1、GDF-15水平均升高,LVEF降低(P<0.001)。与阵发性心房颤动组比较,持续性心房颤动组和永久性心房颤动组LAD、LVEDD、LVESD及血清TRPC1、GDF-15水平均升高,LVEF降低(P<0.05);与持续性心房颤动组比较,永久性心房颤动组LAD、LVEDD、LVESD及血清TRPC1、GDF-15水平均升高,LVEF降低(P<0.05)。与轻度MR组比较,中度MR组和重度MR组LAD、LVEDD、LVESD及血清TRPC1、GDF-15水平均升高,LVEF降低(P<0.05);与中度反流组比较,重度反流组LAD、LVEDD、LVESD及血清TRPC1、GDF-15水平均升高,LVEF降低(P<0.05)。TRPC1、GDF-15是病人发生AF伴MR的危险因素(P<0.01)。结论:AF伴MR病人血清TRPC1、GDF-15水平升高,与AF类型和MR程度有关。 展开更多
关键词 心房颤动 二尖瓣反流 瞬时受体电位通道1 生长分化因子-15 心房颤动类型
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含广义分子势薛定谔方程的束缚态解析解
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作者 陈文利 《杭州师范大学学报(自然科学版)》 2025年第1期107-112,共6页
基于施图姆-刘维尔理论和形状不变性理论,采用Pekeris类型的近似方法,研究广义分子势场的薛定谔方程束缚态问题,获得了任意l态束缚态波函数和能量本征值方程.数值求解能量本征值方程.将获得的不同态的能级数值解和MATHEMATICA程序包所... 基于施图姆-刘维尔理论和形状不变性理论,采用Pekeris类型的近似方法,研究广义分子势场的薛定谔方程束缚态问题,获得了任意l态束缚态波函数和能量本征值方程.数值求解能量本征值方程.将获得的不同态的能级数值解和MATHEMATICA程序包所得结果进行比较,数值结果逼近真实值. 展开更多
关键词 薛定谔方程 形状不变性 束缚态解析解 广义分子势
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基于矢量分类的NPC型三电平双三相PMSM的改进模型预测电压控制
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作者 袁庆庆 步凡 +1 位作者 谢晓彤 夏鲲 《中国电机工程学报》 北大核心 2025年第2期758-768,I0030,共12页
多电平多相电机驱动系统存在电压矢量数目多、冗余复杂及多目标非线性约束等问题。以二极管钳位型三电平六相逆变器驱动双三相永磁同步电机为研究对象,以电机谐波电流抑制和逆变器直流侧中点电位平衡控制为目标,提出一种基于电压矢量三... 多电平多相电机驱动系统存在电压矢量数目多、冗余复杂及多目标非线性约束等问题。以二极管钳位型三电平六相逆变器驱动双三相永磁同步电机为研究对象,以电机谐波电流抑制和逆变器直流侧中点电位平衡控制为目标,提出一种基于电压矢量三角区域分类的改进模型预测电压控制策略。首先,以基波子平面大投影幅值为原则,对729个电压矢量进行初筛;接着,基于三角区域分类方法对筛选后的电压矢量进行分类,并对期望电压进行所属三角区域定位、确定候选矢量。设计满足电机定子电流谐波抑制及逆变器中点电位平衡控制的目标函数;根据电机数学模型和逆变器特征研究多目标控制权重因子的理论设计方法。不同工况下的有效性及对比实验表明,所研究的控制策略不仅能改善多电平多相电机驱动系统的多目标控制性能,还能有效降低控制器计算负担。 展开更多
关键词 二极管钳位型三电平六相逆变器 双三相永磁同步电机 矢量分类 谐波电流 中点电位 模型预测电压控制 权重因子
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Dependent mechanism of Chinese prepositions processing in the brain:evidence from event-related potentials
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作者 方环海 张荣萍 +3 位作者 方环非 高明阳 郑敏 孙潇羽 《Neuroscience Bulletin》 SCIE CAS CSCD 2007年第5期282-286,共5页
Objective To compare the event-related potentials (ERPs) waves of verbs and prepositions in the brain. Methods We recorded ERPs in the brain while participants judged the legality of the collocation for verbs and "... Objective To compare the event-related potentials (ERPs) waves of verbs and prepositions in the brain. Methods We recorded ERPs in the brain while participants judged the legality of the collocation for verbs and "preposition". Results Both verbs and prepositions elicited a negativity at the frontal site in 230-330 ms and 350-500 ms window. No difference was seen in 230-330 ms and 350-500 ms window; In difference waves, a negativity was elicited in the left and fight hemisphere at about 270-400 ms and 470-600 ms window for both open and closed-class words. Conclusion These may demonstrate that prepositions in modem Chinese are probably not a separate class from verbs and that N280 may be not a specific component for only prepositions (or closed-class words). 展开更多
关键词 CHINESE PREPOSITIONS VERBS event-related potentials difference waves
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Many faces of neuronal activity manipulation in Drosophila
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作者 Amber Krebs Steffen Kautzmann Christian Klämbt 《Neural Regeneration Research》 SCIE CAS 2025年第9期2574-2576,共3页
Animals exhibit complex responses to external and internal stimuli.The information is computed by interconnected neurons that express numerous ion channels,which modulate the neuronal membrane potential.How can neuron... Animals exhibit complex responses to external and internal stimuli.The information is computed by interconnected neurons that express numerous ion channels,which modulate the neuronal membrane potential.How can neuronal activity orchestrate complex motor patterns or allow learning from previous experience?To answer such questions,we need the ability not only to record,but also to modulate neuronal activity in both space(e.g.,neuronal subsets)and time. 展开更多
关键词 MANIPULATION potential. NEURONAL
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Mitochondria–cGAS–STING axis is a potential therapeutic target for senescence-dependent inflammaging-associated neurodegeneration
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作者 JoséM.Izquierdo 《Neural Regeneration Research》 SCIE CAS 2025年第3期805-807,共3页
The word “senescence” comes from the Latin senescens, meaning “to begin to age”, and is characterized by a long-lasting but reversible block in proliferation, resulting from stress-induced cell cycle arrest of pre... The word “senescence” comes from the Latin senescens, meaning “to begin to age”, and is characterized by a long-lasting but reversible block in proliferation, resulting from stress-induced cell cycle arrest of previously replication-competent cells. 展开更多
关键词 LATIN POTENTIAL lasting
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Recent Advances in Fibrous Materials for Hydroelectricity Generation
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作者 Can Ge Duo Xu +10 位作者 Xiao Feng Xing Yang Zheheng Song Yuhang Song Jingyu Chen Yingcun Liu Chong Gao Yong Du Zhe Sun Weilin Xu Jian Fang 《Nano-Micro Letters》 SCIE EI CAS 2025年第2期109-133,共25页
Depleting fossil energy sources and conventional polluting power generation pose a threat to sustainable development.Hydroelectricity generation from ubiquitous and spontaneous phase transitions between liquid and gas... Depleting fossil energy sources and conventional polluting power generation pose a threat to sustainable development.Hydroelectricity generation from ubiquitous and spontaneous phase transitions between liquid and gaseous water has been considered a promising strategy for mitigating the energy crisis.Fibrous materials with unique flexibility,processability,multifunctionality,and practicability have been widely applied for fibrous materials-based hydroelectricity generation(FHG).In this review,the power generation mechanisms,design principles,and electricity enhancement factors of FHG are first introduced.Then,the fabrication strategies and characteristics of varied constructions including 1D fiber,1D yarn,2D fabric,2D membrane,3D fibrous framework,and 3D fibrous gel are demonstrated.Afterward,the advanced functions of FHG during water harvesting,proton dissociation,ion separation,and charge accumulation processes are analyzed in detail.Moreover,the potential applications including power supply,energy storage,electrical sensor,and information expression are also discussed.Finally,some existing challenges are considered and prospects for future development are sincerely proposed. 展开更多
关键词 HYDROELECTRICITY Fibrous material Streaming potential Ion diffusion
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