Pub Date : 2022-05-21DOI: 10.24018/ejphysics.2022.4.3.172
Wim Vegt
For many physicists, Albert Einstein’s Theory of General Relativity is the top of Physics. A whole new concept, based on a flexible Space-Time Continuum. A wonderful New and Original insight in the Origins of Space and Time. But nowadays physics requires more than a fundamental theory about Space and Time. The Mathematical foundation for a “Quantum Mechanical Model of the Black Hole” is based on a 10-dimensional Space-Time Continuum. This article has been written in projections of a 10-Dimensional Space-Time Continuum within an easier to understand 4-Dimensional Space-Time Continuum. For that reason, this theory will not start with “Einstein’s famous Field Equations”, but the start will be at a very fundamental concept in Physics. Isaac Newton’s 3rd law as a fundament in Classical- and Quantum Mechanics. To make the theory of the “Quantum Mechanical Model of the Black Hole” as much understandable as possible, this article starts with a short comprehension of the theory.
{"title":"The Cosmic Black Hole as a Solution of the Relativistic Quantum Mechanical DIRAC Equation","authors":"Wim Vegt","doi":"10.24018/ejphysics.2022.4.3.172","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.3.172","url":null,"abstract":"For many physicists, Albert Einstein’s Theory of General Relativity is the top of Physics. A whole new concept, based on a flexible Space-Time Continuum. A wonderful New and Original insight in the Origins of Space and Time. But nowadays physics requires more than a fundamental theory about Space and Time. \u0000The Mathematical foundation for a “Quantum Mechanical Model of the Black Hole” is based on a 10-dimensional Space-Time Continuum. This article has been written in projections of a 10-Dimensional Space-Time Continuum within an easier to understand 4-Dimensional Space-Time Continuum. For that reason, this theory will not start with “Einstein’s famous Field Equations”, but the start will be at a very fundamental concept in Physics. Isaac Newton’s 3rd law as a fundament in Classical- and Quantum Mechanics. \u0000To make the theory of the “Quantum Mechanical Model of the Black Hole” as much understandable as possible, this article starts with a short comprehension of the theory.","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129643214","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}
Pub Date : 2022-05-17DOI: 10.24018/ejphysics.2022.4.3.169
Siyua Cao, Naveen Weerasekera, Dawa Ram Shingdan, Ahmed Ijaz Abdulla
In this work, we have studied the precipitate growth behavior of a metal matrix when subjected to hydrostatic pressure. We utilized Zenner-Frank phase field kinetics with integrated free energy density functional based on volumetric strain energy. We studied the precipitate growth up to 2 GPa under varying bulk modulus of the precipitate phase. We observed that subjecting to hydrostatic pressure influences the growth kinetics by reducing the precipitate growth under time evolution. In addition, the bulk modulus of the precipitate has shown an abnormality in the growth behavior compared to general observations under hydrostatic pressure. This work contributes to the smart tailoring of novel materials to reduce detrimental impacts on holistic material properties, used in large hydrostatic pressure applications.
{"title":"Understanding Precipitate Growth Kinetics at Ultra-High Hydrostatic Pressures","authors":"Siyua Cao, Naveen Weerasekera, Dawa Ram Shingdan, Ahmed Ijaz Abdulla","doi":"10.24018/ejphysics.2022.4.3.169","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.3.169","url":null,"abstract":"In this work, we have studied the precipitate growth behavior of a metal matrix when subjected to hydrostatic pressure. We utilized Zenner-Frank phase field kinetics with integrated free energy density functional based on volumetric strain energy. We studied the precipitate growth up to 2 GPa under varying bulk modulus of the precipitate phase. We observed that subjecting to hydrostatic pressure influences the growth kinetics by reducing the precipitate growth under time evolution. In addition, the bulk modulus of the precipitate has shown an abnormality in the growth behavior compared to general observations under hydrostatic pressure. This work contributes to the smart tailoring of novel materials to reduce detrimental impacts on holistic material properties, used in large hydrostatic pressure applications.","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114334286","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}
Pub Date : 2022-05-13DOI: 10.24018/ejphysics.2022.4.3.170
W. Daywitt
The gravitational constant for the Planck particle (PP), the proton, and electron cores are examined in this paper.Results show there are three different, but numerically equal, expressions for that constant in the Planck vacuum (PV) theory and another separate theory that produce the correct numerical value for the constant. This agreement between the two different theories highly recommends both theories.
{"title":"The Source of the Gravitational Constant for the Dirac Cores in the Planck Vacuum Theory","authors":"W. Daywitt","doi":"10.24018/ejphysics.2022.4.3.170","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.3.170","url":null,"abstract":"\u0000 \u0000 \u0000The gravitational constant for the Planck particle (PP), the proton, and electron cores are examined in this paper.Results show there are three different, but numerically equal, expressions for that constant in the Planck vacuum (PV) theory and another separate theory that produce the correct numerical value for the constant. This agreement between the two different theories highly recommends both theories. \u0000 \u0000 \u0000","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121349588","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}
Pub Date : 2022-04-30DOI: 10.24018/ejphysics.2022.4.2.153
E. B. Ugwu
The geomagnetic field of the earth shields the earth from the hazards of solar wind which is constantly buffeting the earth making the geomagnetic field assume a comet-like shape. In this paper, interplanetary and geomagnetic data were simultaneously analyzed for the period of the solar cycle 24. The analyses allowed us to determine any teleconnections between the solar wind and geomagnetic activity within the period. Results of the analyses show that solar wind and geomagnetic activity are highly connected at high latitudes but the same cannot be said for mid and low latitudes. Any correspondence between geomagnetic activity indices and solar wind parameters are mere coincidences.
{"title":"Teleconnection between Solar Wind Parameters and Geomagnetic Activity","authors":"E. B. Ugwu","doi":"10.24018/ejphysics.2022.4.2.153","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.2.153","url":null,"abstract":"The geomagnetic field of the earth shields the earth from the hazards of solar wind which is constantly buffeting the earth making the geomagnetic field assume a comet-like shape. In this paper, interplanetary and geomagnetic data were simultaneously analyzed for the period of the solar cycle 24. The analyses allowed us to determine any teleconnections between the solar wind and geomagnetic activity within the period. Results of the analyses show that solar wind and geomagnetic activity are highly connected at high latitudes but the same cannot be said for mid and low latitudes. Any correspondence between geomagnetic activity indices and solar wind parameters are mere coincidences.","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125387009","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}
Pub Date : 2022-04-20DOI: 10.24018/ejphysics.2022.4.2.165
E. Haug, Spavieri Gianfranco
What is the size of the universe if we take the estimated mass in the observable universe and compress it until we reach the Planck mass density? We will investigate this using both the Friedmann model and the recent Haug model of the universe that takes into account Lorentz relativistic mass. The resulting size is approximately that of a proton. We will also look at a hypothetical Planck mass size universe. In the Friedmann model one needs rapid expansion of mass to maintain the initial Planck mass density or, alternatively, only space expansion with the density decreasing from its initial conditions, while in the Haug model the Planck mass universe seems to cause no such “strange” predictions.
{"title":"The Planck Mass Density Radius of the Universe","authors":"E. Haug, Spavieri Gianfranco","doi":"10.24018/ejphysics.2022.4.2.165","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.2.165","url":null,"abstract":"\u0000 \u0000 \u0000What is the size of the universe if we take the estimated mass in the observable universe and compress it until we reach the Planck mass density? We will investigate this using both the Friedmann model and the recent Haug model of the universe that takes into account Lorentz relativistic mass. The resulting size is approximately that of a proton. We will also look at a hypothetical Planck mass size universe. In the Friedmann model one needs rapid expansion of mass to maintain the initial Planck mass density or, alternatively, only space expansion with the density decreasing from its initial conditions, while in the Haug model the Planck mass universe seems to cause no such “strange” predictions. \u0000 \u0000 \u0000","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130142618","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}
Pub Date : 2022-04-20DOI: 10.24018/ejphysics.2022.4.2.166
S. Kahane
A series of simulations were conducted with Geant4 in order to verify the electron backscattering experiments performed by Tabata in the low Z elements of Be, C and Al. In general, a quite good agreement was obtained by carefully choosing the physics lists employed. These results invalidate the claim made before by Kirihara et al about the presence of experimental errors in Tabata’s work.
{"title":"Backscattering of MeV Electrons. An Analysis of Tabata’s Experiment with Geant4","authors":"S. Kahane","doi":"10.24018/ejphysics.2022.4.2.166","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.2.166","url":null,"abstract":"A series of simulations were conducted with Geant4 in order to verify the electron backscattering experiments performed by Tabata in the low Z elements of Be, C and Al. In general, a quite good agreement was obtained by carefully choosing the physics lists employed. These results invalidate the claim made before by Kirihara et al about the presence of experimental errors in Tabata’s work.","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124941803","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}
Pub Date : 2022-04-11DOI: 10.24018/ejphysics.2022.4.2.164
J. Stávek
There were published very precise experimental values of the Hubble constant H0 in the range 66 -74 km/s/Mpc during the last decade. There is a very active discussion in the H0 community how to relieve this Hubble constant tension. In our model we have described the cosmological redshift as the expansion of old photons in the Earth´s gravitational field: the joint effect of the Earth´s gravitational redshift and the Earth´s diurnal aberration. This model predicts the value of the Hubble constant on the surface of the Earth EARTHH0 = 66.71 km/s/Mpc and on the board of the Hubble Space Telescope (HST) HSTH0 = 72.34 km/s/Mpc. The value H0 determines the expansion of old photons in the Earth´s gravitational field and not the age of the Universe or the age of that old photon. In order to falsify this model in the spirit of Karl Popper we predict the value of H0 for the surface of the Moon as MOONH0 = 6.62 km/s/Mpc. This experiment for the determination of the value H0 on the Moon´s surface is technically possible with the existing technology during this decade while several advanced countries have plans to realize experiments on the surface of the Moon. This proposed experiment on the surface of the Moon might open a new epoch in the description of our cosmological models.
{"title":"How to Relieve the Hubble Constant Tension? (Earth´s Gravitational Redshift + Earth´s Diurnal Aberration)","authors":"J. Stávek","doi":"10.24018/ejphysics.2022.4.2.164","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.2.164","url":null,"abstract":"There were published very precise experimental values of the Hubble constant H0 in the range 66 -74 km/s/Mpc during the last decade. There is a very active discussion in the H0 community how to relieve this Hubble constant tension. In our model we have described the cosmological redshift as the expansion of old photons in the Earth´s gravitational field: the joint effect of the Earth´s gravitational redshift and the Earth´s diurnal aberration. This model predicts the value of the Hubble constant on the surface of the Earth EARTHH0 = 66.71 km/s/Mpc and on the board of the Hubble Space Telescope (HST) HSTH0 = 72.34 km/s/Mpc. The value H0 determines the expansion of old photons in the Earth´s gravitational field and not the age of the Universe or the age of that old photon. In order to falsify this model in the spirit of Karl Popper we predict the value of H0 for the surface of the Moon as MOONH0 = 6.62 km/s/Mpc. This experiment for the determination of the value H0 on the Moon´s surface is technically possible with the existing technology during this decade while several advanced countries have plans to realize experiments on the surface of the Moon. This proposed experiment on the surface of the Moon might open a new epoch in the description of our cosmological models.","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128578087","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}
Pub Date : 2022-04-08DOI: 10.24018/ejphysics.2022.4.2.162
W. Daywitt
The particle- and antiparticle-equations for the electron or proton cores are coupled Dirac equations, eachof which contains two wavefunctions. Without solving for the wavwfunctions explicitly, it is possible to decouple and solve the equations exactly and completely for the electron and proton cores in terms of a single wavefunctions’ gradients. Calculations repeatedly demonstrate that the reduced Planck constant represents a particle or antiparticle spin coefficient.
{"title":"Reducing the Covariant Dirac Equation for the Electron or Proton Cores to the Gradients of a Single Wavefunction","authors":"W. Daywitt","doi":"10.24018/ejphysics.2022.4.2.162","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.2.162","url":null,"abstract":"\u0000 \u0000 \u0000The particle- and antiparticle-equations for the electron or proton cores are coupled Dirac equations, eachof which contains two wavefunctions. Without solving for the wavwfunctions explicitly, it is possible to decouple and solve the equations exactly and completely for the electron and proton cores in terms of a single wavefunctions’ gradients. \u0000Calculations repeatedly demonstrate that the reduced Planck constant represents a particle or antiparticle spin coefficient. \u0000 \u0000 \u0000","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"226 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124497307","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}
Pub Date : 2022-04-08DOI: 10.24018/ejphysics.2022.4.2.163
Naveen Weerasekera, Siyu Cao, Dawa Ram Shingdon
In this paper, we have introduced a phase field modeling technique to simulate ghost diffusion phenomena of intermetallic compounds in a bulk mettalic matrix phase. We used Zenner-Frank phase field approach to define free energy density functional which is to be evolved using Chan-Hilliard and Alan-Chan equations to simulate time evolution of the precipitates. We verified our simulation results with intermetallic compound growth of Sn-Ag-Cu solder joints in isothermal aging process attributing to the diffusion of Ag3Sn intermetallic compound. Herewith we present that Zenner-Frank model demonstrates sound validity and provides a best understanding of such phenomena.
{"title":"Phase Field Modeling of Ghost Diffusion in Sn-Ag-Cu Solder Joints","authors":"Naveen Weerasekera, Siyu Cao, Dawa Ram Shingdon","doi":"10.24018/ejphysics.2022.4.2.163","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.2.163","url":null,"abstract":"In this paper, we have introduced a phase field modeling technique to simulate ghost diffusion phenomena of intermetallic compounds in a bulk mettalic matrix phase. We used Zenner-Frank phase field approach to define free energy density functional which is to be evolved using Chan-Hilliard and Alan-Chan equations to simulate time evolution of the precipitates. We verified our simulation results with intermetallic compound growth of Sn-Ag-Cu solder joints in isothermal aging process attributing to the diffusion of Ag3Sn intermetallic compound. Herewith we present that Zenner-Frank model demonstrates sound validity and provides a best understanding of such phenomena.","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128869935","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}
Pub Date : 2022-03-28DOI: 10.24018/ejphysics.2022.4.2.156
Reginald B. Little
The recent theory of divergent integrations and divergent differentiations of superluminous spaces for new calculus of the objects for applications for new theory for the mechanics of gravity and the coupling of gravity to electromagnetic fields is applied here to recent data for the zero-gravity altering the biological processes of polymerase proteins replicating DNA for inducing misreadings and mistakes during reproduction for gravity affecting life and cancer. This paper presents new mode for coupling classical to quantum mechanics by gravity. The gravitational stimulating nuclei, hadrons and leptons for hidden drive of dynamics in matter for causing life is outlined. Alterations of gravity and relative motions for altering these dynamics for disease are shortly reviewed. The irrational, fractional superluminous nature of gravity is shown to manifest its nature and action; the distinct coupling of null NMMs relative to nonzero NMMs is given and moreover the different couplings of positive and negative NMMs and combinations thereof are given. The 1H, 14N, and 31P stable isotopes and the almost 100% relative abundances of their positive NMMs are noted to play roles in the origin and development of life and the manifestation of life by the action of gravity on these nano-domains of nonzero NMMs for manifesting ferromagnetism for all positive or all negative NMMs and/or antiferromagnetic and ferrimagnetism of mixed positive and negative NMMs. The uniquenesses of the second-row elements for life and hydrogen are considered. New phenomena by radio waves and the NMMs in elements of heaters and radio wave sources are considered and possibility of life creating radio waves. Some use of this theory for gravity upon nano-domains of NMMs for modeling many systems are noted.
{"title":"Nano-Domains of Nuclear Magnetic Moments for Gravitational Stimulation of Biological Processes","authors":"Reginald B. Little","doi":"10.24018/ejphysics.2022.4.2.156","DOIUrl":"https://doi.org/10.24018/ejphysics.2022.4.2.156","url":null,"abstract":"The recent theory of divergent integrations and divergent differentiations of superluminous spaces for new calculus of the objects for applications for new theory for the mechanics of gravity and the coupling of gravity to electromagnetic fields is applied here to recent data for the zero-gravity altering the biological processes of polymerase proteins replicating DNA for inducing misreadings and mistakes during reproduction for gravity affecting life and cancer. This paper presents new mode for coupling classical to quantum mechanics by gravity. The gravitational stimulating nuclei, hadrons and leptons for hidden drive of dynamics in matter for causing life is outlined. Alterations of gravity and relative motions for altering these dynamics for disease are shortly reviewed. The irrational, fractional superluminous nature of gravity is shown to manifest its nature and action; the distinct coupling of null NMMs relative to nonzero NMMs is given and moreover the different couplings of positive and negative NMMs and combinations thereof are given. The 1H, 14N, and 31P stable isotopes and the almost 100% relative abundances of their positive NMMs are noted to play roles in the origin and development of life and the manifestation of life by the action of gravity on these nano-domains of nonzero NMMs for manifesting ferromagnetism for all positive or all negative NMMs and/or antiferromagnetic and ferrimagnetism of mixed positive and negative NMMs. The uniquenesses of the second-row elements for life and hydrogen are considered. New phenomena by radio waves and the NMMs in elements of heaters and radio wave sources are considered and possibility of life creating radio waves. Some use of this theory for gravity upon nano-domains of NMMs for modeling many systems are noted.","PeriodicalId":292629,"journal":{"name":"European Journal of Applied Physics","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131040758","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：