首页 > 最新文献

Foundations最新文献

英文 中文
Pioneering Black African American Women Chemists and Pharmacists 美国黑人女性化学家和药剂师的先驱
Pub Date : 2022-08-02 DOI: 10.3390/foundations2030043
Juan Núñez Valdés, Fernando de Pablos Pons, A. Ramos Carrillo
It is assumed that the history of modern science in Africa began between the last two decades of the 19th century and the first two or three of the 20th century [...]
据推测,非洲的现代科学史开始于19世纪最后20年和20世纪前两三十年之间[…]
{"title":"Pioneering Black African American Women Chemists and Pharmacists","authors":"Juan Núñez Valdés, Fernando de Pablos Pons, A. Ramos Carrillo","doi":"10.3390/foundations2030043","DOIUrl":"https://doi.org/10.3390/foundations2030043","url":null,"abstract":"It is assumed that the history of modern science in Africa began between the last two decades of the 19th century and the first two or three of the 20th century [...]","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"30 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82998843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Approximating Solutions of Nonlinear Equations Using an Extended Traub Method 用扩展Traub法逼近非线性方程的解
Pub Date : 2022-07-27 DOI: 10.3390/foundations2030042
S. George, I. Argyros, Christopher I. Argyros, Kedarnath Senapati
The Traub iterates generate a sequence that converges to a solution of a nonlinear equation given certain conditions. The order of convergence has been shown provided that the fifth Fréchet-derivative exists. Notice that this derivative does not appear on the Traub method. Therefore, according to the earlier results, there is no guarantee that the Traub method converges if the operator is not five times Fréchet-differentiable or more. However, the Traub method can converge, since these assumptions are only sufficient. The novelty of our new technique is the fact that only the Fréchet-derivative on the method is assumed to exist to prove convergence. Moreover, the new results does not depend on the Traub method. Consequently, the same technique can be applied on other methods. The dynamics of this method are also studied. Examples further explain the theoretical results.
在一定条件下,Traub迭代生成一个收敛于非线性方程解的序列。在存在第五阶fr导数的情况下,证明了收敛的阶数。注意,这个导数没有出现在Traub方法中。因此,根据前面的结果,如果算子不是5倍或更多fr可微的,则不能保证Traub方法收敛。然而,Traub方法可以收敛,因为这些假设是充分的。我们的新技术的新颖之处在于,我们只假定该方法上的frsamet导数存在以证明收敛性。此外,新的结果不依赖于Traub方法。因此,同样的技术可以应用于其他方法。并对该方法的动力学特性进行了研究。实例进一步解释了理论结果。
{"title":"Approximating Solutions of Nonlinear Equations Using an Extended Traub Method","authors":"S. George, I. Argyros, Christopher I. Argyros, Kedarnath Senapati","doi":"10.3390/foundations2030042","DOIUrl":"https://doi.org/10.3390/foundations2030042","url":null,"abstract":"The Traub iterates generate a sequence that converges to a solution of a nonlinear equation given certain conditions. The order of convergence has been shown provided that the fifth Fréchet-derivative exists. Notice that this derivative does not appear on the Traub method. Therefore, according to the earlier results, there is no guarantee that the Traub method converges if the operator is not five times Fréchet-differentiable or more. However, the Traub method can converge, since these assumptions are only sufficient. The novelty of our new technique is the fact that only the Fréchet-derivative on the method is assumed to exist to prove convergence. Moreover, the new results does not depend on the Traub method. Consequently, the same technique can be applied on other methods. The dynamics of this method are also studied. Examples further explain the theoretical results.","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88160387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simpson’s Type Inequalities for s-Convex Functions via a Generalized Proportional Fractional Integral s-凸函数的广义比例分数积分的Simpson型不等式
Pub Date : 2022-07-25 DOI: 10.3390/foundations2030041
Henok Desalegn, J. Mijena, E. Nwaeze, Tadesse Abdi
In this paper, we give new Simpson’s type integral inequalities for the class of functions whose derivatives of absolute values are s-convex via generalized proportional fractional integrals. Some results in the literature are particular cases of our results.
本文利用广义比例分数积分,给出了一类导数绝对值为s凸的函数的新的Simpson型积分不等式。文献中的一些结果是我们结果的特例。
{"title":"Simpson’s Type Inequalities for s-Convex Functions via a Generalized Proportional Fractional Integral","authors":"Henok Desalegn, J. Mijena, E. Nwaeze, Tadesse Abdi","doi":"10.3390/foundations2030041","DOIUrl":"https://doi.org/10.3390/foundations2030041","url":null,"abstract":"In this paper, we give new Simpson’s type integral inequalities for the class of functions whose derivatives of absolute values are s-convex via generalized proportional fractional integrals. Some results in the literature are particular cases of our results.","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74027956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Attenuation of the Acoustic Activity in Cement Beams under Constant Bending Load Closely Approaching the Fracture Load 接近于断裂荷载的恒定弯曲荷载下水泥梁声活动性的衰减
Pub Date : 2022-07-24 DOI: 10.3390/foundations2030040
D. Triantis, A. Loukidis, I. Stavrakas, E. Pasiou, S. Kourkoulis
The acoustic activity in beam-shaped specimens made of cement is studied, assuming that the beams are loaded in three-point bending under a step-wise loading scheme. Attention is focused to the attenuation of the acoustic activity during the constant-load stage of each specific loading step. The experimental data are analyzed in terms of the interevent time intervals between any two successive acoustic hits (using the F-function concept) and, further, in terms of the power of the acoustic hits (in terms of the recently introduced P-function). It is indicated that while the mechanical load is kept constant, the acoustic activity attenuates steadily, and during the early steps of this attenuation phase, the temporal evolution of both the F- and P-functions is excellently described by an exponential law. Moreover, it is proven that for both the F- and P-functions, the relaxation exponents decrease monotonically with increasing load. This decrease becomes quite abrupt for loads exceeding about 80% of the fracture load, providing an interesting and promising pre-failure indicator, i.e., a warning signal that the specimen is entering into the stage of impending macroscopic fracture. The specific conclusions are in very satisfactory agreement, both qualitatively and quantitatively, with similar ones drawn by considering the temporal evolution of the respective b-value.
采用三点弯曲加载方式,采用阶梯加载方式,研究了水泥梁形试件的声活动。关注的重点是在每个特定加载步骤的恒载阶段声活动的衰减。实验数据是根据任何两个连续声击之间的间隔时间(使用f函数概念)进行分析的,并且,根据声击的功率(根据最近引入的p函数)进行分析。结果表明,当机械载荷保持恒定时,声活度稳定衰减,并且在衰减阶段的早期阶段,F函数和p函数的时间演化都可以用指数律很好地描述。此外,还证明了F-函数和p -函数的松弛指数随载荷的增加而单调减小。当载荷超过断裂载荷的80%左右时,这种下降变得非常突然,这提供了一个有趣且有希望的预破坏指标,即试样进入即将发生的宏观断裂阶段的警告信号。具体的结论在定性和定量上都与考虑各自b值的时间演变而得出的类似结论非常令人满意。
{"title":"Attenuation of the Acoustic Activity in Cement Beams under Constant Bending Load Closely Approaching the Fracture Load","authors":"D. Triantis, A. Loukidis, I. Stavrakas, E. Pasiou, S. Kourkoulis","doi":"10.3390/foundations2030040","DOIUrl":"https://doi.org/10.3390/foundations2030040","url":null,"abstract":"The acoustic activity in beam-shaped specimens made of cement is studied, assuming that the beams are loaded in three-point bending under a step-wise loading scheme. Attention is focused to the attenuation of the acoustic activity during the constant-load stage of each specific loading step. The experimental data are analyzed in terms of the interevent time intervals between any two successive acoustic hits (using the F-function concept) and, further, in terms of the power of the acoustic hits (in terms of the recently introduced P-function). It is indicated that while the mechanical load is kept constant, the acoustic activity attenuates steadily, and during the early steps of this attenuation phase, the temporal evolution of both the F- and P-functions is excellently described by an exponential law. Moreover, it is proven that for both the F- and P-functions, the relaxation exponents decrease monotonically with increasing load. This decrease becomes quite abrupt for loads exceeding about 80% of the fracture load, providing an interesting and promising pre-failure indicator, i.e., a warning signal that the specimen is entering into the stage of impending macroscopic fracture. The specific conclusions are in very satisfactory agreement, both qualitatively and quantitatively, with similar ones drawn by considering the temporal evolution of the respective b-value.","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"171 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76911422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Is The Probability of Tossing a Coin Really 50–50%? Part 2: Dynamic Model with Rebounds 掷硬币的概率真的是50% - 50%吗?第2部分:动态模型与反弹
Pub Date : 2022-07-19 DOI: 10.3390/foundations2030039
V. Pletser
In the first part of this paper, we considered several theoretical models, a static and four dynamic models without rebounds, of the throw of a fair coin landing on its edge, to demonstrate that the probability of heads or tails is less than 50%, depending on the initial toss conditions, the coin geometry and conditions of the coin and landing surfaces. For the dynamic model with rebounds that is the subject of this second part of the paper, it is found that the probability that a 50 Euro cent coin thrown from a normal height with common initial velocity conditions and appropriate surface conditions will end up on its edge is in the order of one against several thousand.
在本文的第一部分,我们考虑了几种理论模型,一个静态模型和四个无反弹的动态模型,投掷均匀硬币的边缘着陆,证明正面或反面的概率小于50%,取决于初始投掷条件,硬币的几何形状,硬币和着陆表面的条件。对于本文第二部分的主题——带有反弹的动态模型,我们发现,在通常的初速度条件和适当的表面条件下,一枚50欧分硬币从正常高度抛掷到其边缘的概率大约是千分之一。
{"title":"Is The Probability of Tossing a Coin Really 50–50%? Part 2: Dynamic Model with Rebounds","authors":"V. Pletser","doi":"10.3390/foundations2030039","DOIUrl":"https://doi.org/10.3390/foundations2030039","url":null,"abstract":"In the first part of this paper, we considered several theoretical models, a static and four dynamic models without rebounds, of the throw of a fair coin landing on its edge, to demonstrate that the probability of heads or tails is less than 50%, depending on the initial toss conditions, the coin geometry and conditions of the coin and landing surfaces. For the dynamic model with rebounds that is the subject of this second part of the paper, it is found that the probability that a 50 Euro cent coin thrown from a normal height with common initial velocity conditions and appropriate surface conditions will end up on its edge is in the order of one against several thousand.","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"10 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89508429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Integrated Interpretation of the Results of Long-Term Geotechnical Monitoring in Underground Tunnels Using the Electromagnetic Radiation Method 电磁辐射法对地下隧道长期岩土监测结果的综合解释
Pub Date : 2022-07-05 DOI: 10.3390/foundations2030038
K. Romanevich, M. Lebedev, S. Andrianov, Sergey N. Mulev
Electromagnetic radiation (EMR) technology makes it possible to evaluate changes in the stress-strain state (SSS) in the “tunnel lining-enclosing rock mass” system at a high level of interference, and to create schemes of long-term EMR control in tunnels (geotechnical monitoring systems). The issues of the variations in EMR signals are extremely important for monitoring systems: based on anomalous deviations from the normal regime one can draw conclusions about changes in the SSS, leading to geodynamic phenomena (e.g., rock bursts). This article presents data obtained during laboratory studies on samples and field studies in transport tunnels. Also, some results of long-term geotechnical monitoring by a set of methods is presented: EMR and tensometry of the tunnel lining, both methods are in the automatic mode. The ability of an EMR control system to respond to earthquakes affecting tunnel structures is shown. An analysis of long-term EMR studies was conducted, which showed the periodic oscillation of the “tunnel lining-enclosing rock mass” system. In a stable compressed state, minima of EMR pulses are recorded; when the rock mass and lining material are stretched, charges are separated on the edges of micro-defects and EMR increases; complete separation of the edges of micro-defects leads to the termination of intense EMR. The same occurs in the opposite direction during the compression of micro-defects and micro-fractures in the rock mass and concrete lining. The periods of compression and expansion are closely related to temperature fluctuations. The results differ in detail and, therefore, in to be more confident, additional studies are needed in various host rock massifs and types of tunnel lining.
电磁辐射(EMR)技术可以在高干扰水平下评估“隧道衬砌-围岩”系统的应力-应变状态变化,并制定隧道(岩土监测系统)长期电磁辐射控制方案。EMR信号变化的问题对监测系统极为重要:根据与正常状态的异常偏差,可以得出SSS变化的结论,从而导致地球动力学现象(例如,岩爆)。本文介绍了在对样品进行实验室研究和对运输隧道进行实地研究时获得的数据。此外,还介绍了一套长期岩土工程监测方法的一些结果:隧道衬砌的EMR和张力测量方法均处于自动模式。研究了EMR控制系统对影响隧道结构的地震的响应能力。通过对长期EMR研究的分析,发现“衬砌-围岩”系统存在周期性振荡。在稳定压缩状态下,记录EMR脉冲的最小值;当岩体和衬砌材料受到拉伸时,电荷在微缺陷边缘分离,EMR增大;微缺陷边缘的完全分离导致强EMR的终止。在岩体和混凝土衬砌的微缺陷和微裂缝的压缩过程中,同样的情况发生在相反的方向上。压缩和膨胀的周期与温度波动密切相关。结果在细节上有所不同,因此,为了更有信心,需要对不同的寄主岩体和隧道衬砌类型进行额外的研究。
{"title":"Integrated Interpretation of the Results of Long-Term Geotechnical Monitoring in Underground Tunnels Using the Electromagnetic Radiation Method","authors":"K. Romanevich, M. Lebedev, S. Andrianov, Sergey N. Mulev","doi":"10.3390/foundations2030038","DOIUrl":"https://doi.org/10.3390/foundations2030038","url":null,"abstract":"Electromagnetic radiation (EMR) technology makes it possible to evaluate changes in the stress-strain state (SSS) in the “tunnel lining-enclosing rock mass” system at a high level of interference, and to create schemes of long-term EMR control in tunnels (geotechnical monitoring systems). The issues of the variations in EMR signals are extremely important for monitoring systems: based on anomalous deviations from the normal regime one can draw conclusions about changes in the SSS, leading to geodynamic phenomena (e.g., rock bursts). This article presents data obtained during laboratory studies on samples and field studies in transport tunnels. Also, some results of long-term geotechnical monitoring by a set of methods is presented: EMR and tensometry of the tunnel lining, both methods are in the automatic mode. The ability of an EMR control system to respond to earthquakes affecting tunnel structures is shown. An analysis of long-term EMR studies was conducted, which showed the periodic oscillation of the “tunnel lining-enclosing rock mass” system. In a stable compressed state, minima of EMR pulses are recorded; when the rock mass and lining material are stretched, charges are separated on the edges of micro-defects and EMR increases; complete separation of the edges of micro-defects leads to the termination of intense EMR. The same occurs in the opposite direction during the compression of micro-defects and micro-fractures in the rock mass and concrete lining. The periods of compression and expansion are closely related to temperature fluctuations. The results differ in detail and, therefore, in to be more confident, additional studies are needed in various host rock massifs and types of tunnel lining.","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74729297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Is the Probability of Tossing A Coin Really 50–50%? Part 1: Static Model and Dynamic Models without Rebounds 抛硬币的概率真的是50% - 50%吗?第1部分:静态模型和没有反弹的动态模型
Pub Date : 2022-07-01 DOI: 10.3390/foundations2030037
Pletser Vladimir
Considering that a fair coin has two sides and a cylindrical edge, the probability that it would fall on its edge is calculated, yielding the probability of heads or tails of less than 50%. In this first part, the theoretical models for a static case and for five dynamic cases, without rebounds, show that there is a small probability that the coin does not fall on its head or tail, depending on the initial toss conditions, the coin geometry and conditions of the coin and landing surfaces. It is found that the probability that a 50 Eurocent coin thrown from a normal height with common initial velocity conditions and appropriate surface conditions will end up on its edge is in the order of one against several thousand. In the second part of the paper, the dynamic model with rebounds is investigated.
考虑到一枚均匀硬币有两个面和一个圆柱形的边缘,计算它掉落在其边缘的概率,得到正面或反面的概率小于50%。在第一部分中,静态情况下的理论模型和五种动态情况下的理论模型,没有反弹,表明有一个小的概率,硬币不会落到它的头或尾巴,取决于初始投掷条件,硬币的几何形状和硬币的条件和着陆面。我们发现,在一般的初速度条件和适当的表面条件下,一枚50欧分的硬币从正常高度抛掷到硬币边缘的概率大约是千分之一。在论文的第二部分,研究了带回弹的动力学模型。
{"title":"Is the Probability of Tossing A Coin Really 50–50%? Part 1: Static Model and Dynamic Models without Rebounds","authors":"Pletser Vladimir","doi":"10.3390/foundations2030037","DOIUrl":"https://doi.org/10.3390/foundations2030037","url":null,"abstract":"Considering that a fair coin has two sides and a cylindrical edge, the probability that it would fall on its edge is calculated, yielding the probability of heads or tails of less than 50%. In this first part, the theoretical models for a static case and for five dynamic cases, without rebounds, show that there is a small probability that the coin does not fall on its head or tail, depending on the initial toss conditions, the coin geometry and conditions of the coin and landing surfaces. It is found that the probability that a 50 Eurocent coin thrown from a normal height with common initial velocity conditions and appropriate surface conditions will end up on its edge is in the order of one against several thousand. In the second part of the paper, the dynamic model with rebounds is investigated.","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82138203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Experiments on the Electron Impact Excitation of the 2s and 2p States of Hydrogen Atoms Confirm the Presence of Their Second Flavor as the Candidate for Dark Matter 氢原子2s和2p态的电子冲击激发实验证实了它们的第二味作为暗物质的候选存在
Pub Date : 2022-06-26 DOI: 10.3390/foundations2030036
E. Oks
For the excitation of the n = 2 states of hydrogen atoms due to electron impact, we compared the experimental and theoretical ratios of the cross-sections σ2s/σ2p. We found this theoretical ratio to be systematically higher than the corresponding experimental ratio by about 20%—far beyond the experimental error margins. We suggest that this discrepancy can be explained by the presence of the Second Flavor of Hydrogen Atoms (SFHA) in the experimental hydrogen gas. The explanation is based on the fact that, in the experiments, the cross-section σ2s was determined by using the quenching technique—by applying an electric field that mixed the 2s and 2p states, followed by the emission of the Lyman-alpha line from the 2p state. However, the SFHA only had the s-states, so the quenching technique would not count the excitation of the SFHA in the 2s state and, thus, lead to the underestimation of the cross-section σ2s. We estimates the share of the SFHA in the experimental hydrogen gas required for eliminating the above discrepancy and found this share to be about the same as the share of the usual hydrogen atoms. Thus, our results constitute the third proof from atomic experiments that the SFHA does exist, the first proof being related to the experimental distribution of the linear momentum in the ground state of hydrogen atoms, and the second proof being related to the experimental cross-section of charge exchange between hydrogen atoms and low-energy protons.
对于电子碰撞激发氢原子的n = 2态,我们比较了实验和理论截面σ2s/σ2p的比值。我们发现这个理论比率比相应的实验比率系统地高出约20%,远远超出了实验误差范围。我们认为这种差异可以用实验氢气中第二味氢原子(SFHA)的存在来解释。这一解释是基于这样一个事实:在实验中,σ2s的横截面是用淬火技术测定的,即施加一个2s和2p态混合的电场,然后从2p态发射莱曼- α线。然而,由于SFHA只有s态,因此淬火技术没有计算SFHA在2s态的激发,从而导致了截面σ2s的低估。我们估计了SFHA在消除上述差异所需的实验氢气中的份额,发现这一份额与通常氢原子的份额大致相同。因此,我们的结果构成了原子实验中SFHA确实存在的第三个证明,第一个证明与氢原子基态线性动量的实验分布有关,第二个证明与氢原子与低能质子之间电荷交换的实验横截面有关。
{"title":"Experiments on the Electron Impact Excitation of the 2s and 2p States of Hydrogen Atoms Confirm the Presence of Their Second Flavor as the Candidate for Dark Matter","authors":"E. Oks","doi":"10.3390/foundations2030036","DOIUrl":"https://doi.org/10.3390/foundations2030036","url":null,"abstract":"For the excitation of the n = 2 states of hydrogen atoms due to electron impact, we compared the experimental and theoretical ratios of the cross-sections σ2s/σ2p. We found this theoretical ratio to be systematically higher than the corresponding experimental ratio by about 20%—far beyond the experimental error margins. We suggest that this discrepancy can be explained by the presence of the Second Flavor of Hydrogen Atoms (SFHA) in the experimental hydrogen gas. The explanation is based on the fact that, in the experiments, the cross-section σ2s was determined by using the quenching technique—by applying an electric field that mixed the 2s and 2p states, followed by the emission of the Lyman-alpha line from the 2p state. However, the SFHA only had the s-states, so the quenching technique would not count the excitation of the SFHA in the 2s state and, thus, lead to the underestimation of the cross-section σ2s. We estimates the share of the SFHA in the experimental hydrogen gas required for eliminating the above discrepancy and found this share to be about the same as the share of the usual hydrogen atoms. Thus, our results constitute the third proof from atomic experiments that the SFHA does exist, the first proof being related to the experimental distribution of the linear momentum in the ground state of hydrogen atoms, and the second proof being related to the experimental cross-section of charge exchange between hydrogen atoms and low-energy protons.","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77152202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Comparative Performance of NIR-Hyperspectral Imaging Systems nir -高光谱成像系统的性能比较
Pub Date : 2022-06-22 DOI: 10.3390/foundations2030035
Te Ma, L. Schimleck, J. Dahlen, S. Yoon, T. Inagaki, S. Tsuchikawa, A. Sandak, J. Sandak
Near-infrared spectroscopy (NIRS) allows for the rapid estimation of a wide range of wood properties. Typically, NIRS studies on wood have utilized benchtop spectrometers, but efforts to utilize NIR hyperspectral imaging to examine wood and wood products have increased. Compared to benchtop NIR systems, hyperspectral imaging has several advantages (speed, visualization of spatial variability), but the data typically have a lower signal-to-noise ratio as well as fewer wavelengths saved; thus, hyperspectral imaging systems have a larger spectral sampling interval (SSI). Furthermore, the SSI and wavelength range varies considerably among different HSI cameras. NIR-HSI systems based on indium gallium arsenide (InGaAs) detectors have a wavelength range typically from 900 to 1700 nm, while short-wave infrared hyperspectral imaging (SWIR-HSI) systems based on mercury cadmium telluride (MCT) detectors have the ‘full’ NIR wavelength range from 1000 to 2500 nm. These factors may influence the performance of wood property calibrations. We compared one NIR-HSI (900–1700 nm) and three SWIR-HSI (1000–2500 nm) commercially available cameras with an NIRS benchtop spectrometer (1100–2500 nm). The performance of specific gravity (SG) and stiffness (MOE) calibration models was compared with one-hundred Douglas-fir (Pseudotsuga menziesii) samples. The limited wavelength range of an NIR-HSI camera provided the best models for MOE, whereas the NIR-HSI and two SWIR-HSI cameras provided similar SG results. SWIR-HSI models heavily favored wavelengths greater than 1900 nm.
近红外光谱(NIRS)可以快速估计木材的各种特性。通常,对木材的近红外研究使用了台式光谱仪,但利用近红外高光谱成像来检查木材和木制品的努力有所增加。与台式近红外系统相比,高光谱成像有几个优点(速度快,空间可变性的可视化),但数据通常具有较低的信噪比以及较少的波长;因此,高光谱成像系统具有较大的光谱采样间隔(SSI)。此外,SSI和波长范围在不同的HSI相机之间差异很大。基于砷化铟镓(InGaAs)探测器的NIR- hsi系统通常具有900至1700 nm的波长范围,而基于碲化汞镉(MCT)探测器的短波红外高光谱成像(SWIR-HSI)系统具有1000至2500 nm的“全”近红外波长范围。这些因素可能会影响木材性能校准的性能。我们将一台NIR-HSI (900-1700 nm)和三台sir - hsi (1000-2500 nm)市售相机与一台NIRS台式光谱仪(1100-2500 nm)进行了比较。比较了100个道格拉斯杉木(pseudosuga menziesii)样品的比重(SG)和刚度(MOE)标定模型的性能。NIR-HSI相机的有限波长范围提供了最佳的MOE模型,而NIR-HSI和两台sir - hsi相机提供了类似的SG结果。SWIR-HSI模型非常倾向于波长大于1900 nm。
{"title":"Comparative Performance of NIR-Hyperspectral Imaging Systems","authors":"Te Ma, L. Schimleck, J. Dahlen, S. Yoon, T. Inagaki, S. Tsuchikawa, A. Sandak, J. Sandak","doi":"10.3390/foundations2030035","DOIUrl":"https://doi.org/10.3390/foundations2030035","url":null,"abstract":"Near-infrared spectroscopy (NIRS) allows for the rapid estimation of a wide range of wood properties. Typically, NIRS studies on wood have utilized benchtop spectrometers, but efforts to utilize NIR hyperspectral imaging to examine wood and wood products have increased. Compared to benchtop NIR systems, hyperspectral imaging has several advantages (speed, visualization of spatial variability), but the data typically have a lower signal-to-noise ratio as well as fewer wavelengths saved; thus, hyperspectral imaging systems have a larger spectral sampling interval (SSI). Furthermore, the SSI and wavelength range varies considerably among different HSI cameras. NIR-HSI systems based on indium gallium arsenide (InGaAs) detectors have a wavelength range typically from 900 to 1700 nm, while short-wave infrared hyperspectral imaging (SWIR-HSI) systems based on mercury cadmium telluride (MCT) detectors have the ‘full’ NIR wavelength range from 1000 to 2500 nm. These factors may influence the performance of wood property calibrations. We compared one NIR-HSI (900–1700 nm) and three SWIR-HSI (1000–2500 nm) commercially available cameras with an NIRS benchtop spectrometer (1100–2500 nm). The performance of specific gravity (SG) and stiffness (MOE) calibration models was compared with one-hundred Douglas-fir (Pseudotsuga menziesii) samples. The limited wavelength range of an NIR-HSI camera provided the best models for MOE, whereas the NIR-HSI and two SWIR-HSI cameras provided similar SG results. SWIR-HSI models heavily favored wavelengths greater than 1900 nm.","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72396528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
On the Semi-Local Convergence of a Noor–Waseem-like Method for Nonlinear Equations 非线性方程noor - waseem类方法的半局部收敛性
Pub Date : 2022-06-20 DOI: 10.3390/foundations2020034
I. Argyros, J. P. Jaiswal, A. Saxena, M. Argyros
The significant feature of this paper is that the semi-local convergence of high order methods for solving nonlinear equations defined on abstract spaces has not been studied extensively as done for the local convergence by a plethora of authors which is certainly a more interesting case. A process is developed based on majorizing sequences and the notion of restricted Lipschitz condition to provide a semi-local convergence analysis for the third convergent order Noor–Waseem method. Due to the generality of our technique, it can be used on other high order methods. The convergence analysis is enhanced. Numerical applications complete are used to test the convergence criteria.
本文的显著特点是,求解抽象空间上定义的非线性方程的高阶方法的半局部收敛问题还没有像许多作者对局部收敛问题那样得到广泛的研究,这当然是一个更有趣的例子。基于最大化序列和受限Lipschitz条件的概念,给出了三阶Noor-Waseem方法的半局部收敛性分析。由于我们的技术的通用性,它可以用于其他高阶方法。增强了收敛性分析。数值应用完成了测试收敛准则。
{"title":"On the Semi-Local Convergence of a Noor–Waseem-like Method for Nonlinear Equations","authors":"I. Argyros, J. P. Jaiswal, A. Saxena, M. Argyros","doi":"10.3390/foundations2020034","DOIUrl":"https://doi.org/10.3390/foundations2020034","url":null,"abstract":"The significant feature of this paper is that the semi-local convergence of high order methods for solving nonlinear equations defined on abstract spaces has not been studied extensively as done for the local convergence by a plethora of authors which is certainly a more interesting case. A process is developed based on majorizing sequences and the notion of restricted Lipschitz condition to provide a semi-local convergence analysis for the third convergent order Noor–Waseem method. Due to the generality of our technique, it can be used on other high order methods. The convergence analysis is enhanced. Numerical applications complete are used to test the convergence criteria.","PeriodicalId":81291,"journal":{"name":"Foundations","volume":"252 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75808880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Foundations
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1