Here, we initially introduced and demonstrated two principles: orientation OR principle and attraction AT principle of electrical dipoles. The OR principle stipulates that any two electrical dipoles P1A, P1B, from two...Here, we initially introduced and demonstrated two principles: orientation OR principle and attraction AT principle of electrical dipoles. The OR principle stipulates that any two electrical dipoles P1A, P1B, from two bodies A and B, at any distance in the free state each, will be reciprocally oriented parallel and in the same sense if the electrical interaction forces F between them are of decreasing type with distance r. If the electrical interaction forces F are of increasing type with distance, the two dipoles will be reciprocally oriented parallel but on the opposite sense. The AT principle stipulate that any two electrical dipoles P1A, P1B, at any distance in the free state each, will present always a reciprocal force of attraction FD in both cases of orientation accordingly to OR principle in case of any type of electrical force F decreasing or increasing with distance. These findings may complete our previous work where we found that FD force, between two electrical dipoles P1A, P1B considered at atomic and nuclear level, is in fact the actual gravitation Newton force FN. The paper must be considered together with this work for more consistency.展开更多
The mechanism of erosion of a riverbank is not easy to analyze and each sediment particle is under influence of number of forces. Among all these forces, force of cohesion between the particles plays a very dominant a...The mechanism of erosion of a riverbank is not easy to analyze and each sediment particle is under influence of number of forces. Among all these forces, force of cohesion between the particles plays a very dominant and significant role, and, till date, not much progress has been made to analyze this force in a deterministic manner. A particle is bound to its neighboring particles under this force of cohesion. In this paper, the analysis of forces acting on a particle on a riverbank has been made with a model called the Truncated Pyramid Model. A particle requires a certain velocity to escape from the riverbank and determination of the escape velocity can pave the way for finding out other parameters like entrainment rate, erosion coefficient and so on. Calculation and estimation of riverbank erosion rate is an important aspect of river basin management. In this paper it has been shown that the escape velocity is dependent on certain micro-level parameters like inter-particle distance and volume of the water bridge between two adjacent particles. Also, for saline water the particle requires less velocity to escape compared to the pure-water scenario. The findings of the present paper exactly fall in line with the results of another paper where the researchers showed that cohesive force between the particles decreases as water turns from pure to impure.展开更多
The A-level tourist attractions are an important carrier for the development of the tourism industry.As the most fundamental tourism supply,studying their spatial distribution pattern and driving forces is of great si...The A-level tourist attractions are an important carrier for the development of the tourism industry.As the most fundamental tourism supply,studying their spatial distribution pattern and driving forces is of great significance for promoting the process of regional tourism industrialization.This study used the tourism resource abundance index,nearest neighbor distance index,and geographic detector model to study the spatial characteristics and driving forces of A-level tourist attractions in China.The results showed that the A-level tourist attractions in China exhibit significant spatial clustering,but there are significant regional differences.They are mainly distributed on the southeastern side of the Hu Huanyong Line.Overall,the average of tourism resource abundance index is 71.74.The proportion of cities above that average is relatively low,and they form local high-value clustering areas mainly in the Beijing-Tianjin-Hebei urban agglomeration,Yangtze River Delta,and Chengdu-Chongqing regions.The spatial distribution patterns of various types of scenic spots also exhibit agglomeration characteristics,but their agglomeration scales and spatial patterns exhibit obvious regional differences.The spatial distribution pattern of A-level tourist attractions in China is a result of the combined effect of regional socio-economic factors and scenic environmental factors.Among them,the explanatory power of regional socio-economic factors is stronger than that of scenic environmental factors.Among the scenic environmental factors,resource endowment has the strongest explanatory power,and there are significant differences in the dominant factors influencing the distributions of different types of A-level tourist attractions.展开更多
An interfacial force microscope （IFM） was employed to measure the inter-particle forces between two individual glass beads with diameters varying from 8 to 20 μm. With the feedback function of IFM turned off, attra...An interfacial force microscope （IFM） was employed to measure the inter-particle forces between two individual glass beads with diameters varying from 8 to 20 μm. With the feedback function of IFM turned off, attractive forces were obtained. The forces varied in the range of 0.1-0.34 μN, and their validity was confirmed by a theoretical analysis of the van der Waals force between the same glass beads. With the feedback function switched on, no attractive forces between particles were detected by the IFM when the probe approached the sample substrate. This may be attributed to the dramatic change of the attractive forces within a very short separation distance and/or the relatively poor signal-to-noise ratio of the IFM.展开更多
Tractor beams,able to produce optical pulling forces(OPFs)on particles,are attracting increasing attention.Here,non-paraxial Bessel tractor beams are generated using polarization-insensitive metasurfaces.OPFs are foun...Tractor beams,able to produce optical pulling forces(OPFs)on particles,are attracting increasing attention.Here,non-paraxial Bessel tractor beams are generated using polarization-insensitive metasurfaces.OPFs are found to exert on dielectric particles with specific radii at the axes of the beams.The strengths of the OPFs depend on the radii of the particles,which provides the possibility of sorting particles with different sizes.For the OPFs,the radius ranges of particles vary with the polarization states or topological charges of the incident beams.The change of polarizations can provide a switch between the pulling and pushing forces,which offers a new way to realize dynamic manipulation of particles.The change of topological charges leads to disjoint radii ranges for the OPFs exerting on particles,which provides the possibility of selective optical separation.Moreover,we study the behaviors of particles in the tractor beams.The simulation results reveal that linearly or circularly polarized tractor beams can pull particles a sufficient distance towards the light source,which verifies the feasibility of separating particles.展开更多
Fines migration is defined as separation of a Nano-sized particle by fluid flow in porous media and its migration along some distances and its entrapment in a narrow pore throat or its settlement on pore wall. Althoug...Fines migration is defined as separation of a Nano-sized particle by fluid flow in porous media and its migration along some distances and its entrapment in a narrow pore throat or its settlement on pore wall. Although this phenomenon happens in scales of Nano-meters, it can lead to sever irretrievable damages. This damage includes permeability reduction that causes drastic oil recovery reduction. There are several forces impacting a fine that is placed on a pore wall. Some of most important forces affecting settlement of a fine in porous media in presence of a fluid are electrical forces. Electrical forces consist of several long and short range forces. This study focuses on a long range force called Double Layer Force (DLF) that beside Van der Waals is one of most powerful electrical forces. DLF is a repulsive force that can repel a particle from pore wall and result separation of a Nano-sized solid which subsequently moves along with flowing fluid and clogs a throat. The DLF depends on the solid material (reservoir rock and fine) and fluid properties (i.e. ionic strength, pH). This study investigates how each of these parameters affects DLF and introduces proper conditions for reservoir water flooding for controlling fines migration.展开更多
The phenomenon of electrical attraction and repulsion between charged particles is well known, and described mathematically by Coulomb’s Law, yet until now there has been no explanation for why this occurs. There has...The phenomenon of electrical attraction and repulsion between charged particles is well known, and described mathematically by Coulomb’s Law, yet until now there has been no explanation for why this occurs. There has been no mechanistic explanation that reveals what causes the charged particles to accelerate, either towards or away from each other. This paper gives a detailed explanation of the phenomena of electrical attraction and repulsion based on my previous work that determined the exact wave-function solutions for both the Electron and the Positron. It is revealed that the effects are caused by wave interactions between the wave functions that result in Electromagnetic reflections of parts of the particle’s wave functions, causing a change in their momenta.展开更多
I.INTRODUCTION In recent ten years, a good deal of efforts have been made to study the NN interaction using the quark model (QM). Refs. [2] and [7] have explained the NN short-range repulsive force with the one-gluon ...I.INTRODUCTION In recent ten years, a good deal of efforts have been made to study the NN interaction using the quark model (QM). Refs. [2] and [7] have explained the NN short-range repulsive force with the one-gluon exchange potential and展开更多
文摘Here, we initially introduced and demonstrated two principles: orientation OR principle and attraction AT principle of electrical dipoles. The OR principle stipulates that any two electrical dipoles P1A, P1B, from two bodies A and B, at any distance in the free state each, will be reciprocally oriented parallel and in the same sense if the electrical interaction forces F between them are of decreasing type with distance r. If the electrical interaction forces F are of increasing type with distance, the two dipoles will be reciprocally oriented parallel but on the opposite sense. The AT principle stipulate that any two electrical dipoles P1A, P1B, at any distance in the free state each, will present always a reciprocal force of attraction FD in both cases of orientation accordingly to OR principle in case of any type of electrical force F decreasing or increasing with distance. These findings may complete our previous work where we found that FD force, between two electrical dipoles P1A, P1B considered at atomic and nuclear level, is in fact the actual gravitation Newton force FN. The paper must be considered together with this work for more consistency.
文摘The mechanism of erosion of a riverbank is not easy to analyze and each sediment particle is under influence of number of forces. Among all these forces, force of cohesion between the particles plays a very dominant and significant role, and, till date, not much progress has been made to analyze this force in a deterministic manner. A particle is bound to its neighboring particles under this force of cohesion. In this paper, the analysis of forces acting on a particle on a riverbank has been made with a model called the Truncated Pyramid Model. A particle requires a certain velocity to escape from the riverbank and determination of the escape velocity can pave the way for finding out other parameters like entrainment rate, erosion coefficient and so on. Calculation and estimation of riverbank erosion rate is an important aspect of river basin management. In this paper it has been shown that the escape velocity is dependent on certain micro-level parameters like inter-particle distance and volume of the water bridge between two adjacent particles. Also, for saline water the particle requires less velocity to escape compared to the pure-water scenario. The findings of the present paper exactly fall in line with the results of another paper where the researchers showed that cohesive force between the particles decreases as water turns from pure to impure.
基金The National Natural Science Foundation of China(42401207,42371195)The Youth Research Project of Humanities and Social Science of the Ministry of Education(22YJC790152)The Key Scientific Research Project of Colleges and Universities of Henan Province(23A790020)。
文摘The A-level tourist attractions are an important carrier for the development of the tourism industry.As the most fundamental tourism supply,studying their spatial distribution pattern and driving forces is of great significance for promoting the process of regional tourism industrialization.This study used the tourism resource abundance index,nearest neighbor distance index,and geographic detector model to study the spatial characteristics and driving forces of A-level tourist attractions in China.The results showed that the A-level tourist attractions in China exhibit significant spatial clustering,but there are significant regional differences.They are mainly distributed on the southeastern side of the Hu Huanyong Line.Overall,the average of tourism resource abundance index is 71.74.The proportion of cities above that average is relatively low,and they form local high-value clustering areas mainly in the Beijing-Tianjin-Hebei urban agglomeration,Yangtze River Delta,and Chengdu-Chongqing regions.The spatial distribution patterns of various types of scenic spots also exhibit agglomeration characteristics,but their agglomeration scales and spatial patterns exhibit obvious regional differences.The spatial distribution pattern of A-level tourist attractions in China is a result of the combined effect of regional socio-economic factors and scenic environmental factors.Among them,the explanatory power of regional socio-economic factors is stronger than that of scenic environmental factors.Among the scenic environmental factors,resource endowment has the strongest explanatory power,and there are significant differences in the dominant factors influencing the distributions of different types of A-level tourist attractions.
文摘An interfacial force microscope （IFM） was employed to measure the inter-particle forces between two individual glass beads with diameters varying from 8 to 20 μm. With the feedback function of IFM turned off, attractive forces were obtained. The forces varied in the range of 0.1-0.34 μN, and their validity was confirmed by a theoretical analysis of the van der Waals force between the same glass beads. With the feedback function switched on, no attractive forces between particles were detected by the IFM when the probe approached the sample substrate. This may be attributed to the dramatic change of the attractive forces within a very short separation distance and/or the relatively poor signal-to-noise ratio of the IFM.
基金the National Natural Science Foundation of China(Grant Nos.61805119 and 62275122)the Natural Science Foundation of Jiangsu Province(Grant Nos.BK20180469 and BK20180468)the Fundamental Research Funds for the Central Universities(Grant No.30919011275)。
文摘Tractor beams,able to produce optical pulling forces(OPFs)on particles,are attracting increasing attention.Here,non-paraxial Bessel tractor beams are generated using polarization-insensitive metasurfaces.OPFs are found to exert on dielectric particles with specific radii at the axes of the beams.The strengths of the OPFs depend on the radii of the particles,which provides the possibility of sorting particles with different sizes.For the OPFs,the radius ranges of particles vary with the polarization states or topological charges of the incident beams.The change of polarizations can provide a switch between the pulling and pushing forces,which offers a new way to realize dynamic manipulation of particles.The change of topological charges leads to disjoint radii ranges for the OPFs exerting on particles,which provides the possibility of selective optical separation.Moreover,we study the behaviors of particles in the tractor beams.The simulation results reveal that linearly or circularly polarized tractor beams can pull particles a sufficient distance towards the light source,which verifies the feasibility of separating particles.
文摘Fines migration is defined as separation of a Nano-sized particle by fluid flow in porous media and its migration along some distances and its entrapment in a narrow pore throat or its settlement on pore wall. Although this phenomenon happens in scales of Nano-meters, it can lead to sever irretrievable damages. This damage includes permeability reduction that causes drastic oil recovery reduction. There are several forces impacting a fine that is placed on a pore wall. Some of most important forces affecting settlement of a fine in porous media in presence of a fluid are electrical forces. Electrical forces consist of several long and short range forces. This study focuses on a long range force called Double Layer Force (DLF) that beside Van der Waals is one of most powerful electrical forces. DLF is a repulsive force that can repel a particle from pore wall and result separation of a Nano-sized solid which subsequently moves along with flowing fluid and clogs a throat. The DLF depends on the solid material (reservoir rock and fine) and fluid properties (i.e. ionic strength, pH). This study investigates how each of these parameters affects DLF and introduces proper conditions for reservoir water flooding for controlling fines migration.
文摘The phenomenon of electrical attraction and repulsion between charged particles is well known, and described mathematically by Coulomb’s Law, yet until now there has been no explanation for why this occurs. There has been no mechanistic explanation that reveals what causes the charged particles to accelerate, either towards or away from each other. This paper gives a detailed explanation of the phenomena of electrical attraction and repulsion based on my previous work that determined the exact wave-function solutions for both the Electron and the Positron. It is revealed that the effects are caused by wave interactions between the wave functions that result in Electromagnetic reflections of parts of the particle’s wave functions, causing a change in their momenta.
文摘I.INTRODUCTION In recent ten years, a good deal of efforts have been made to study the NN interaction using the quark model (QM). Refs. [2] and [7] have explained the NN short-range repulsive force with the one-gluon exchange potential and
