Search

Several experimental groups reported the evidence of periodic modulations of nuclear decay constants which amplitudes are of the order $${{10}^{{ - 3}}}$$ and periods of one year, 24 h or about one month. We argue that such deviations from radioactive decay law can be described in nonlinear quantum mechanics framework, in which decay process obeys to nonlinear Shrodinger equation with Doebner–Goldin terms. Possible corrections to Hamiltonian of quantum system interaction with gravitation field considered, it’s shown that they correspond to some emergent gravity theories, in particular, bilocal field model. It’s shown that proposed model describes decay parameter variations which agree with experimental results for Po-214 $$\alpha $$ -decay life-time oscillations.

Swarm intelligence method is an effective way to improve the particle degradation and sample depletion of the traditional particle filter. This paper proposes a particle filer based on the gravitation field algorithm (GF-PF), and the gravitation field algorithm is introduced into the resampling process to improve particle degradation and sample depletion. The gravitation field algorithm simulates the solar nebular disk model, and introduces the virtual central attractive force and virtual rotation repulsion force between particles. The particles are moves rapidly to the high-likelihood region under action of the virtual central attractive force. The virtual rotation repulsion force makes the particles keep a certain distance from each other. These operations improve estimation performance, avoid overlapping of particles and maintain the diversity of particles. The proposed method is applied into INS/gravity gradient aided navigation, by combining the sea experimental data of an inertial navigation system. Compared with the particle swarm optimization particle filter(PSO-PF) and artificial physics optimized particle filter (APO-PF), the GF-PF has higher position estimate accuracy and faster convergence speed with the same experimental conditions.

Magnetic field is an information medium for security applications as well as other physical fields. From the security point of view, the magnetic field is the second safest physical field just after the gravitation field, because it is hard to manipulate the magnetic field in wide area without notice and it is impossible to shield it completely. Magnetic field variations can be generated by several different sources - by the movement of the object in the Earth’s magnetic field, by the current flow between the device and the power lines, by the changes in the residual magnetization caused by the temperature change of the object and others. The presented article describes examples of the possibilities when securing the objects by magnetic sensors, the experimental part of the article presents a set of basic experiments to demonstrate the possibility of using magnetometry for security applications.

Studies about a formal analogy between the gravitational and the electromagnetic fields lead to the notion of Gravitoelectromagnetism (GEM) to describe gravitation. In fact, the GEM equations correspond to the weak field approximation of gravitation field. Here a non-abelian extension of the GEM theory is considered. Using the Thermo Field Dynamics (TFD) formalism to introduce temperature effects some interesting physical phenomena are investigated. The non-abelian GEM Stefan-Boltzmann law and the Casimir effect at zero and finite temperature for this non-abelian field are calculated., 14 pages, accepted for publication in Advances in High Energy Physics

Due to the industrial applications of nasno materials, the growth of Copper oxide (CuO) nanowires (NWs) at the same and opposite directions of the electric and gravitational fields was investigated to study the effects of fields on the NWs properties. The experiments were designed to grow NWs using thermal oxidation method at 450 °C for 50 h. NWs growth was evaluated to study two distinct cases; first, substrates exposed to the gravitational field and second those treated with electric field (EF) in-lined with gravitation field (GF). It was observed that the electric field developed a diameter homogeneity while compressing the NWs and decreasing the diameters. Furthermore, the GF influenced only the length of the NWs, while the EF had an impact on both length and diameter of the NWs. The direction of fields played an important role in NWs morphology and intensity of XRD pattern and optical properties. It was also observed that field direction greatly influenced the NWs length and diameter.

Several experimental groups observed periodic modulations of nucleus decay constants which amplitudes are of the order 10−3 and periods of one year, 24 hours or about one month. We argue that such deviations from radioactive decay law can be described in nonlinear quantum mechanics framework, in which decay process obeys to nonlinear Shroedinger equation with Doebner-Goldin terms. Corrections to Hamiltonian of quantum system interaction with gravitation field considered, it’s shown that they correspond to some emergent gravity models, in particular, bilocal gravity theory. It’s shown that modified proposed model predicts decay parameter variations under influence of Sun gravity similar to experimental results for 214Po α-decay life-time oscillations.

The problem of the motion of a large particle in the suspension of small (Brownian) particles in the gravitation field has been considered. The effect of the concentration of the small fraction on the established velocity of the large particle has been analyzed. A diagram showing the characteristic regions of the different behavior of the large particle in the suspension has been plotted. The case of the motion of the large particle in the suspension with an inhomogeneous height distribution of the small particles has been considered separately. It was shown that, in this case, large particles gather at a certain height depending on the determining parameters of the problem.

This research was funded by the National Natural Science Foundation of China (Nos. 61572227, 61772227, 61702214), the Development Project of Jilin Province of China (Nos 20170101006JC, 20180414012GH, 20170203002GX, 20190201293JC), Zhuhai Premier-Discipline Enhancement Scheme, China (Grant 2015YXXK02) and Guangdong Premier Key-Discipline Enhancement Scheme, China (Grant 2016GDYSZDXK036). This work was also supported by Jilin Provincial Key Laboratory of Big Date Intelligent Computing, China (No. 20180622002JC).

Department of Biological Science, Hannam University, Daejeon 305-811, KoreaReceived August 27, 2013, Accepted September 17, 2013Key Words : Gravitational field-flow fractionation (GrFFF), Gas Chromatography (GC), Mixed culture, Sac-charomyces cerevisiae (S. cerevisiae), Acetobacter aceti (A. aceti)Saccaromyces cerevisia (S. cerevisiae) is a species ofyeast, which is widely used in wine-making and bread-baking. Acetobacter aceti (A. aceti) is used for production ofvinegar.

Gravitation Field Algorithm (GFA) is a simple but very effective heuristic search algorithm. This algorithm has obvious advantages in multimodal function optimization problems compared with SA and GA. However, when we want to get a more precise global optimal value, it needs a lot of initial dusts involved in computing, which causes a low efficiency of the algorithm. In this paper, we propose Parallel Gravitation Field Algorithm (PGFA) based on the island model, taking advantage of the powerful computing ability of GPU and CUDA parallel computing architecture. In PGFA, dust points uniformly distributed in a plurality of islands, and we achieved a parallel movement and evolution of dusts on each island. We compared PGFA with GFA in the unimodal functions and multimodal functions. The experimental results show that PGFA can not only get an effective speedup, but also higher accuracy than the GFA.

Goniophotometry is the fundamental measurement method for the measurement of spatial distribution of the light output of luminaires. The measurement results are represented by luminous intensity distribution curves (LIDC). This information is used by lighting designers for computation of photometric parameters to predict photometric values in real lighting installations. Therefore accuracy of the measurement of the LIDC is very important to provide the best information for other processing. In practice for this type of measurements various types of goniophotometers can be used according to recommendation CIE 121:1996. The main purpose of the recommendation is to describe the different types if goniophotometers and to give recommendations to the measurement process. Currently this document is under revision to implement the new approaches in the field of goniophotometry. One of the most common type of instruments is the goniophotometer with rotating luminaire. Due to the simplicity of construction, moderate space requirements and favourable price most of the testing laboratories are using this type of goniophotometer for measuring LIDC of luminaires. There are possible errors present due to work position of luminaire in Earth gravitation field is changing by rotating the luminaire around its axis. The CIE recommendation tells if this type of goniophotometer is used correction should be applied e.g. by means of auxiliary photometer or other possible methods. The auxiliary photometer during the actual measurement can shade luminous parts of the luminaire what can influence the shape of the LIDC and also the derived photometric results. This paper deals with investigation of the correction methods in goniophotometric measurements using luminaire rotating goniophotometers. Results of measurements of LIDCs were validated by means of other type of goniophotometer which did keep the work position of the luminaires (mirror goniophotometer) during measurements. Conclusions of this work should provide recommendation for methods of corrections in goniophotometry of LIDC of luminaires which LIDCs are measured with luminaire rotating type of goniophotometer. Furthermore paper reveals the possible errors which can occur in the measurement of LIDC of luminaires with various types of lamps.

Self-gravitating thin ring in the gravitation field of a galaxy is investigated. It's shown that all toroidal structures are subjected to the secular instability, but the dynamical instability is possible under some conditions. Self-gravitating formation can “diffuse” forming some ring system or brake up to separate self-gravitating condensations.

Several levels of the nervous system are responsible for stability of the vertical position in humans. Three basic inputs are involved: atrial, visual and proprioceptive as well as mechanoreceptors present in the skin. Signals from these inputs control the body posture and its orientation with respect to internal and external reference systems. External systems are formed based on the gravitation field and visual stimuli. Internal systems are generated in the central nervous system by polymodal representations, also referred to as body schema. Some of environmental factors of driver’s work place could disturb postural stability. Almost all vehicles are according with actual norms and directives. We investigate how normal week of work has impact on postural stability in new city buses. We concentrate on postural stability for closed eyes. In this paper results of investigation were presented.

This paper is an attempt at a brief description of the problem of measuring the gravitation field characteristics, namely, the first and second derivatives of the gravitation potential. The logics of the description required to outline the range of associated problems of fundamental physics and geophysics, which must and can be solved through measurements with a torsion balance.

Exact solutions to two problems of solid rotary oscillation in ideal liquid in the presence of gravitation field have been obtained.

In order to treat quantum cosmology in the framework of Weyl spacetimes we take the first step of extending the Arnowitt-Deser-Misner formalism to Weyl geometry. We then obtain an expression of the curvature tensor in terms of spatial quantities by splitting spacetime in (3+1)-dimensional form. We next write the Lagrangian of the gravitation field based in Weyl-type gravity theory. We extend the general relativistic formalism in such a way that it can be applied to investigate the quantum cosmology of models whose spacetimes are endowed with a Weyl geometrical structure., 10 pages

We investigate a new model of nonlinear electromagnetic field coupled with the gravitation field. The black hole solution is obtained possessing the asymptotic Reissner-Nordstr\"om solution. The electric field has the finite value at the origin and there are not singularities., Comment: 8 pages, 1 figure, accepted for publication in IJGMMP

Дослідження глибинної будови надр Східного нафтогазоносного регіону України є одним із стратегічних завдань України на шляху нарощування розвіданих запасів нафти і газу та забезпечення власної енергетичної безпеки. Необхідним кроком на цьому шляху є продовження практики геолого-геофізичних досліджень по всій території із залученням нових прогресивних методів і технологій, які дають змогу на новому якісному рівні узгодити всю накопичену за багато десятиліть інформацію щодо складної глибинної будови нафтогазоносних регіонів України. Одним із аспектів розв’язку задачі прогнозування нафтогазоносності перспективної Леськівсько- Коротицької структурно-тектонічної підзони Північного борту ДДз за геофізичними даними є оцінка можливості вивчення нафтогазонасичених об’єктів за даними гравірозвідувальних досліджень в комплексі з іншими геоло-геофізичними даними. Для досягнення цієї мети на прикладі Свиридівського газоконденсатного родовища створено петрофізичну модель густини порід колекторів та розраховано зміни об’ємної густини породи та величини гравітаційних ефектів на денній поверхні, які створюють ці зміни. Підтверджено принципову можливість реєстрації подібних малоамлітудних ефектів за допомогою сучасних цифрових гравіметрів компанії Scintrex (Канада)., Study of deep structure of the Eastern oil-and-gas-bearing region of Ukraine is one of its strategic tasks towards increasing of the proven oil-and-gas reserves and ensuring of its energy security. The necessary step in this direction is the continuation of practice of geological and geophysical studies throughout the whole territory with the help of the new advanced methods and techniques that, on a new qualitative level, will allow correlating of all the information on the complex deep structure of oil-and-gas-bearing regions of Ukraine accumulated for many decades. One of the solution aspects of the oil-and-gas-bearing capacity prediction task of the promising Leskivk- Korotych structural tectonic subzone of the Northern DDd edge on the basis of the geophysical data is the evaluation of possibility of oil-and-gas-saturated objects study on the basis of the gravity survey data in combination with other geological and geophysical data. To achieve this goal, the petrophysical model of the reservoir rock density was developed and changes in the rock volume density and gravitational effects values on the surface that produce these changes were calculated on the example of Svyrydivke gas-condensate field. The principle registration possibility of such low-amplitude effects was confirmed using the modern digital gravimeters of Scintrex Company (Canada).

One of the limitations to use glass felt separators (AGM type) in sealed rechargeable cells of high capacity and big height can be their inability to keep the uniform distribution of electrolyte by the height in the gravitation field. The influence of various factors (separator height, degree of its compression, electrolyte density) on separator ability to keep the initial uniform distribution of electrolyte has been investigated.

Hierarchical mergers of galaxies can form binary black holes (BBHs) since many or most galaxies have central massive black holes (BHs). It is possible that some BBHs exist in active galactic nuclei (AGNs). We argue that each BH may be surrounded by an accretion disc with a different inclination angle to the line of sight (due to different BH spin directions and the Bardeen-Petterson effect). The observed Fe K_alpha line profile from a BBH system is a combination of the lines from the inner regions of the two discs, which is significantly affected by the inclination angles of the two discs. The Fe K_alpha line profile associated with BBHs may have an unusual shape with double or more peaks as well as short-term variability, which can be distinguished from the Fe K_alpha line properties of some other possible models. We suggest that with the improvement of resolution in X-ray astronomy, Fe K_alpha line profiles be a potential tool to probe the existence of massive BBHs in AGNs. The Fe K_alpha line profile associated with BBHs may also provide a tool to investigate the dynamics in strong gravitation field (e.g. providing evidence of the Bardeen-Petterson effect)., 11 pages, including 2 figures

Gravitational-electromagnetic entities “geons” are singularity-free solutions of the Einstein-Maxwell equations. These structures in cylindrical symmetry are considered here through the noncompactified Kaluza-Klein theory which describes geometrically the gravitation field and its sources.

In this paper, the effect of the gravitation field on the characteristics of dendritic structures is described during solidification by changing the direction of movement of the solid-melt interface Solidification experiments were made by changing the equipment in three different ways. First, the dendrites were grown horizontally, then vertically in two different arrangements. In the first case the solidification front moved from downwards, and in the second case downwards. During the measurements, the solidification parameters of the dendritic structure, namely the values of primary dendrite arm spacing, were compared as a function of time for. A Quantimet 570 type image-analyzing equipment and an in-house computer code were used for determining these values.

The gravitational field effect on atomic data for H and C IV transitions are considered as a perturbation of initial and final energy levels. We found that this perturbation increases with the principal quantum number. Here we give several expressions for estimation of this effect and its influence on atomic data parameters. Also, the calculations of atomic data for 1s ? 2p (Ly?) and 2s ? 3p transitions of hydrogen atom as well as atomic data for 2s2S1/2?2p2P0 1/2,3/2 transitions of C IV (1UV) as a function of deformation of energy levels due to gravitation field and gravitational redshift are given. The gravitational field effect should be estimated and should be taken into account in calculation of atomic data for emitters in Broad Line Regions (BLRs) of Active Galactic Nuclei (AGN).

THE theory of unified representation of gravitation field proposed by the author is modelledupon spherical approximation for disturbing potential. It is a common knowledge that sphericalapproximation should lead to a result involving an innate error. This kind of error is tolerableonly for general application, an ellipsoidal correction has to be taken into account in case of de-siring for a result with higher accuracy. The purpose of this note is to try to make an extension...

It is shown that a Lagrangian, describing the interaction of the gravitation field with the dilaton and the antisymmetric tensor in arbitrary dimension spacetime, admits an isotropic p-brane solution consisting of three blocks. Relations with known p-brane solutions are discussed. In particular, in ten-dimensional spacetime the three-block p-brane solution is reduced to the known solution, which recently has been used in the D-brane derivation of the black hole entropy., Comment: 22 pages, latex. A missed solution is added, misprints are corrected

In this paper, with the application of the Delauney variables, according to the Hamilton equations, the influence on the perturbation of a satellite exerted by the gravitational force of the earth through canonical transformation has been found out. As a result, the equation about how the position and velocity of the satellite vary with time is deduced.

Spatially-homogeneous and anisotropic Bianchi type-III, V, VI0 cosmological models in Rosen's (1973) bimetric theory of gravitation are considered. It is shown that, in each case, when the soure of the gravitation field is a perfect fluid distribution Bianchi type cosmological models do not exist. Hence vacuum models are presented and studied.

The effect of gravitation field of spherically symmetric mass on the birefringent properties of crystals has been analysed. It has been shown that the gravitation field with spherical symmetry can lead to a change of birefringence in anisotropic media.

The Gravity Recovery and Interior Laboratory (GRAIL) mission successfully ended in December, 2012 after an extended science phase of over 280 days mapping the gravitation field gradient of the Moon with a precision of better than 50 E-6 g's over the entire lunar surface. The mission was performed by two tandem flying spacecraft, both of which carried a Microwave Dual One-way Ranging (DOWR) instrument that together formed a highly precise relative measure of the distance between the two spacecraft as they orbited the Moon. The precision of the radio link maintained by the DOWR instruments was derived from the frequency stability of the ultra-stable oscillators (USOs) on-board each spacecraft. The opportunity to observe the USOs frequency throughout the GRAIL mission provides a record of not only the intrinsic performance of the oscillators, but their behavior during exposure to space conditions. We describe the effect to the frequency of each GRAIL USO, A and B, resulting from the March 7th, 2012 X5.4 level solar flare, just several days into GRAIL's science collection phase. We discuss the impact of this radiation exposure, and the asymmetric behavior of two USOs coincidentally perturbed by the same space-weather event.

Reception of physical environmental signals caused by alteration of the gravitation field leads to the shift of morpho-physiological cell characteristics. The gravity influence on a cell may be direct or non direct, its extent varying in dependence of the cell model applied. Direct influences are more pronounced in vitro, while non direct influences are usually expressed in the community of unicellular organisms (in vivo). Gravity affects morphogenesis processes, such as locomotion, adhesion, intercellular contacts, etc. At the same time, all the processes named are under control of cell integral systems of the signal transduction. Minor disturbances in this system coming from the environment, due to amplification, may provide significant modulations of the signals. So, studies of this system at the level of molecular cell reception is of great interest. Results of flight and model experiments are discussed in the present manuscript.

In this paper, with the globally-accepted lunar gravitation field models LP165P and GLGM-2, character of the lunar gravitation field models were analyzed based on kaula theory. Then, making use of LP165P models truncated to 70 orders and degrees, the free running time span of lunar satellite of 100km height were given. Last, a maneuver method for orbit height keeping is presented for 100km height orbit. The result of this paper deduced time consuming of the computer and reached certain precision when using lunar gravitation field models.

There are many aspects of observational evidence that cometary nuclei have irregular or nonspherical shape. The triaxial figure of the Halley's Comet nucleus is a well known fact. Therefore, the nucleus shape plays a significant role in consideration of the formation and evolution of comets and several attempts have been made to explain their nonsphericity. These studies were mainly based on the random-walk schemes for the aggregation processes. Although some results indeed lead to irregularities and deviation from sphericity, the spherical or irregular shape seem to be prevailing results. On the other hand the triaxial figure can be formed by the tidal and rotational forces. Thus, the assumption that the shape of the cometary nucleus due to some of these effects is in principle acceptable. In here assumed scenario already evolved cometary nucleus is situated as a satellite in the gravitation field of a planetary-like body. Since the rigidity of the nucleus is low, it may be easily transferred in the state of a synchronous satellite and in its shape could be imprinted the dynamical effects from this epoch. Here presented results indicate, that such a possibility should be seriously considered. The theory of this process is applied to the nucleus of comet Halley. It is shown, that the nucleus might be synchronously orbiting around a planetary-like hypothetical body with a period of 0.7 days. The minimal bulk tensile strength of the cometary material of about 102 N m−2 is estimated.

This paper reports a multifunctional silicon micromachined gyroscope for determining attitude of the rotating carrier. Both the principle and the experiment of the gyroscope are presented to explain the multifunction. This article explains the way to determine the deflecting direction and deflecting position of the rotating carrier in the gravitation field. In the final part, the influence of temperature on determining attitude is discussed.

A new method of calculating numerically time evolution of a gravitational field in General Relatity is introduced. Vierbein (tetrad) formalism, dynamic lattice and massively parallelized computation are suggested as they are expected to speed up the calculations considerably and facilitate the solution of problems previously considered too hard to be solved, such as the time evolution of a system consisting of two or more black holes or the structure of worm holes.