Simultaneous Effects of Hydrostatic Pressure and Conduction Band Non-parabolicity on Binding Energies and Diamagnetic Susceptibility of a Hydrogenic Impurity in Spherical Quantum Dots

与在中心上 hydrogenic 杂质的抗磁的危险性一起的 1S， 2S，和 2P 状态的有约束力的精力上的传导乐队 non-parabolicity 和静水力学的压力的同时的效果在典型 GaAs/AlxGa1xAs 球形的量点限制了理论上用矩阵 diagonalization 方法被调查。在这方面，乐队 non-parabolicity 的效果用 LuttingerKohn 有效集体方程被执行了。有约束力的精力和 hydrogenic 杂质的抗磁的危险性面对传导乐队 non-parabolicity 效果作为点半径的一个函数和压力的不同的值被计算。结果我们到达了如下：乐队边 non-parabolicity 的加入增加有约束力的精力和减少为一个给定的压力和半径的抗磁的危险性的绝对值；有约束力的精力增加和有增加压力的抗磁的危险性还原剂的大小。

An effective quantum defect theory for the diamagnetic spectrum of a barium Rydberg atom

A theoretical calculation is carried out to investigate the spectrum of a barium Rydberg atom in an external magnetic field. Using an effective approach incorporating quantum defect into the centrifugal term in the Hamiltonian, we reexamine the reported spectrum of the barium Rydberg atom in a magnetic field of 2.89 T [J. Phys. B 28 L537 （1995）]. Our calculation employs B-spline basis expansion and complex coordinate rotation techniques. For single photon absorption from the ground 6s2 to 6snp Rydberg states, the spectrum is not influenced by quantum defects of channels ns and nd. The calculation is in agreement with the experimental observations until the energy reaches E = -60 cm-1. Beyond this energy, closer to the threshold, the calculated and experimental results do not agree with each other. Possible reasons for their discrepancies are discussed. Our study affirms an energy range where the diamagnetic spectrum of the barium atom can be explained thoroughly using a hydrogen model potential.

Motional Stark Effect and Its Active Cancellation in Diamagnetic Spectrum of Barium

With time-of-flight and electric field ionization detection technique, we investigate the motional Stark effect for highly excited Rydberg barium in high magnetic field and its active cancellation experimentally. In the experiment, the atom beam is aligned at a small angle of 15° with respect to the magnetic field. The motional Stark effect cancellation is demonstrated on two sets of. circularly polarized spectra in static magnetic field B = 1.00000 Tesla and B = 1.70000 Tesla, respectively, although the effect is very small （- 3.5 Vcm^-1） in our apparatus configuration.

Numerical linear analysis of the effects of diamagnetic and shear flow on ballooning modes

The linear analysis of the influence of diamagnetic effect and toroidal rotation at the edge of tokamak plasmas with BOUT++ is discussed in this paper. This analysis is done by solving the dispersion relation, which is calculated through the numerical integration of the terms with different physics. This method is able to reveal the contributions of the different terms to the total growth rate. The diamagnetic effect stabilizes the ideal ballooning modes through inhibiting the contribution of curvature. The toroidal rotation effect is also able to suppress the curvaturedriving term, and the stronger shearing rate leads to a stronger stabilization effect. In addition,through linear analysis using the energy form, the curvature-driving term provides the free energy absorbed by the line-bending term, diamagnetic term and convective term.

Diamagnetic Behavior in Nanoparticle Hematite?

A paper by Mi et al. [1] suggested that certain nano-sized hematite (α-Fe2O3) particles had diamagnetic properties at room temperature. Since diamagnetic behavior is not a property normally attributed to hematite particles (hematite is generally regarded as a canted antiferromagnetic material at room temperature) we decided to test the validity of the suggestions in [1] by performing magnetic susceptibility and magnetic hysteresis measurements on a series of hematite nanoparticles with average sizes of 8 nm, 30 nm and 40 nm in diameter. We initially considered two possible explanations for the apparent diamagnetic behavior of the nanoparticles in [1]: either 1) the hematite nanoparticles themselves exhibited this unusual diamagnetic behavior, or 2) the diamagnetic response was simply the signal created by a diamagnetic dispersant that was overriding a weak positive magnetic susceptibility signal of the hematite nanoparticles. Our experiments strongly suggested the latter explanation that the apparent “diamagnetic” behavior seen in [1] was caused by a diamagnetic dispersant dominating the magnetic properties of the dispersed hematite nanoparticles.

Space Magnetism and Superconductivity: Diamagnetic Expulsion, Meissner Effect, Magnetic Pressure and Quantum Trapping Lead to the Origin and Stability of the Saturn Rings

Existence of the magnetic field of Saturn and the temperature around 70 - 100 K nearby of it bring us to the idea of diamagnetism and superconductivity of the rings particles. The rings could emerge from the icy particles moving on chaotic orbits around Saturn within protoplanetary cloud. After appearance of the magnetic field of Saturn all chaotic orbits of icy particles start to shift to the magnetic equator plane, where there is a minimum of the particles magnetic energy, due to diamagnetic force of expulsion like Meissner phenomenon. Each particle comes to the stable position preventing its own horizontal and vertical shift. Particles are locked within three-dimensional magnetic well due to Abrikosov quantum vortex phenomenon for superconductor. This mechanism is valid and it works even particles have a small fraction of superconductor. Final picture is similar to the picture of iron particles forms the same shape around a magnet on laboratory table. Any other phenomena like gravity resonances, dusty plasma and others may bring some peculiarities to the final picture of the rings. It follows that magnetic field of Saturn and low temperature around of it are the main reason for the rings origin and the rings is product of the early time of the magnetic field of Saturn appearance. Additional matter to the rings also may come from the frozen water particles generated from the Saturn sputniks geysers due to magnetic coupling between planet and satellites. The data of Cassini mission to Saturn rings are conforming suggested theory of their origin and existence.

Dynamic Analysis of Micro-machined Diamagnetic Stable Permanent Magnet Levitation System

A novel micro-machined diamagnetic stable levitation system (MDSLS) which is composed of a free permanent magnetic rotor, a ring lifting permanent magnet and two diamagnetic stabilizers was presented. The static and dynamic stable characters of MDSLS were analyzed. The coupled non-linear differential equations were used to describe six-degree-of-freedom motion of the levitated rotor, and the equivalent surface current and combined diamagnetic image current method were utilized to model the interaction forces and torques between the lifting permanent magnet and rotor permanent magnet and also between the rotor permanent magnet and diamagnetic substrates. Because of difficulty to get analytical solution, the numerical calculation based on Runge-Kutta method was used to solve the dynamic model. The vibration frequencies were identified by fast Fourier transform (FFT) analysis. According to their resonance characteristics and parameters, the translational and angular dynamic stiffness were also calculated. The results show that the levitation of the rotor in MDSLS is stable, and the MDSLS is potential for the application in levitation inertial sensor.

Statistics and Correlation Properties of Diamagnetic High Rydberg Hydrogen Atom

在磁场的 Rydherg 氢原子的系列与 B 花键基础功能用线性变化方法被计算了[Acta Phys。罪恶。55 (2006 ) 3380 ] 。把我们关于高 Rydberg 精力层次做了一些统计分析的计算基于这些。近邻居的精力间距分发和 3 统计与是的磁场关于抗磁的 Rydberg 氢原子被显示出 0.6 T 和 6 T。多样地交叉的现象，多样地反生气，并且交叉混合了并且精力层次反生气出现在这份报纸。为两个盒子，在更低的精力的范围，精力水平统计性质关门到泊松分发。与增加精力，精力水平统计性质离开到泊松分发并且一步一步地趋于到 Wigner 分发。

提升2Cr15Mnl5Ni2N不锈钢抗磁性工艺研究

2Cr15Mn15Ni2N奥氏体抗磁不锈钢是一种性能优良的抗磁不锈钢,为了满足高抗磁性零件需求,通过采用抗磁性检测、金相组织分析和晶粒度检测,就固溶保温温度和保温时间对2Cr15Mn15Ni2N奥氏体抗磁不锈钢的抗磁性的影响进行了工艺研究。结果发现,1120℃固溶,延长保温时间,当2Cr15Mn15Ni2N抗磁不锈钢晶粒度长大到6级、晶粒度均匀一致时,抗磁性达到了≤Ⅱ级,满足了产品技术要求,解决了产品固溶抗磁性不足的技术问题,提出了生产过程工艺控制参数,可为后续同类问题的处理提供借鉴。

Spin chiral anisotropy of diamagnetic chiral mesostructured In_(2)O_(3)films

Spin chiral anisotropy(SChA)refers to the occurrence of different spin polarization in antipodal chiral structures.Herein,we report the SChA in diamagnetic chiral mesostructured In2O3 films(CMIFs)with manifestation of chirality-dependent magnetic circular dichroism(MCD)signals.CMIFs were grown on fluorine-doped tin dioxide conductive glass(FTO)substrates,which were synthesized via a hydrothermal route,with malic acid used as the symmetry-breaking agent.Two levels of chirality have been identified in CMIFs:primary nanoflakes with atomically twisted crystal lattices and secondary helical stacking of the nanoflakes.CMIFs exhibit chirality-dependent asymmetric MCD signals due to the different interactions of chirality-induced effective magnetic field and external magnetic field,which distinguish from the commonly observed external magnetic fielddependent symmetric MCD signals.These findings provide insights into spin manipulation of spin-paired diamagnets.

Investigation of Potential Factors on South Atlantic Magnetic Anomaly

The first part of this investigation analyzes the deep earthquake occurrences in Nazca subducting under South America. The depth taken is to get information about possible influences from the unknown materials and formations under the crust. The results revealed the presence of malleable material, which is unbreakable and, therefore, unable to trigger earthquakes. The structure of those elements is diamagnetic, attracting ionized particles from the Van Allen belt region in the ionosphere. The charged particles travel towards Earth’s surface, enhanced during the geomagnetic storms. The South Atlantic Magnetic Anomaly (SAMA) found that the deformation suffered by the anomaly moving from South Africa to South America is, possibly due to a bulge of unknown flexible material buried underneath the oceanic and continental crust. The continental part is strengthening in weakness because the background also has a high amount of diamagnetic material in this region, and it would not happen over the Atlantic Ocean, where part of the deformation is placed.

Modeling and Validation of Diamagnetic Rotor Levitated by Permanent Magnetics

As an innovative,low-power consuming,and low-stiffness suspension approach,the diamagnetic levitation technique has attracted considerable interest because of its potential applicability in miniaturized mechanical systems.The foundation of a diamagnetic levitation system is mathematical modeling,which is essential for operating performance optimization and stability prediction.However,few studies on systematic mathematical modeling have been reported.In this study,a systematic mathematical model for a disc-shaped diamagnetically levitated rotor on a permanent magnet array is proposed.Based on the proposed model,the magnetic field distribution characteristics,diamagnetic levitation force characteristics(i.e.,levitation height and stiffness),and optimized theoretical conditions for realizing stable levitation are determined.Experiments are conducted to verify the feasibility of the proposed mathematical model.Theoretical predictions and experimental results indicate that increasing the levitation height enlarges the stable region.Moreover,with a further increase in the rotor radius,the stable regions of the rotor gradually diminish and even vanish.Thus,when the levitation height is fixed,a moderate rotor radius permits stable levitation.This study proposes a mathematical modeling method for a diamagnetic levitation system that has potential applications in miniaturized mechanical systems.

悬浮式低频宽带电磁振动能量收集器

振动能量收集技术是一种解决无线传感网络供电难题的理想方案。为实现低频、宽带振动能的高效收集,设计了一种基于抗磁悬浮系统的悬浮式电磁振动能量收集器。利用抗磁悬浮系统的低刚度特性降低系统的工作频率,并通过碰撞实现振动能量收集器工作频带的拓宽。对所设计的振动能量收集器进行理论分析和实验研究,分析悬浮磁铁的抗磁悬浮机理,建立振动能量收集器的机电耦合模型,测试了不同振动激励、负载条件下振动能量收集器的电能输出特性。实验结果表明,当激励加速度为0.3g时,峰-峰电压为205 mV,最大均方根输出功率为105.7μW,工作带宽可达8 Hz。

推挽式抗磁悬浮气流能量采集器的悬浮特性分析

研究了一种推挽式抗磁悬浮结构。通过对其悬浮特性的研究,探索了其在能量采集器领域的应用潜力。使用MATLAB进行数值仿真发现,提升磁铁和悬浮磁铁的间距LL存在一个变化范围,悬浮磁铁可以在该范围内的任意一点稳定悬浮,具有悬浮点可调的特点。基于轴向合力和轴向势能研究了悬浮磁铁的悬浮特性随着LL的变化趋势,结果表明该结构的悬浮点、最大单稳悬浮空间和轴向磁弹簧刚度均可调节。基于该抗磁悬浮结构搭建了气流能量采集器样机,当气体体积流量为3000 m L/min时,可以采集并输出1.924 V的峰值电压和90.25 m W的输出功率,能量采集器的输出性能有了明显提升,可以为无线传感网络中的传感节点供电。同时,该结构在执行器和传感器等领域也具有良好的应用潜力。

推挽式抗磁悬浮气流能量采集器动态稳定性分析

为了探究推挽式抗磁悬浮气流能量采集器的动态稳定性,对其进行了力学分析。通过理论分析和数值分析发现,在径向位移一样的情况下,推挽式结构中的悬浮磁体受到的径向恢复力比只有提升磁体的结构更大;在径向位移增幅一样的情况下,推挽式结构中的悬浮磁体受到的轴向力变化比只有提升磁体的结构更小。实验发现,当推挽式结构中的悬浮磁体被体积流量为3000 mL/min的气流吹动时,其最大水平位移为2.27 mm,最大倾斜角度为0.482°,分别仅是只有提升磁体的结构的22.976%和3.998%。进行了只有单侧气流喷嘴工作的气流能量采集实验,发现推挽式结构解决了只有提升磁体的结构无法进行单侧气流能量收集的问题。在只有单侧气流喷嘴工作的情况下,其平均峰值电压达到了0.667 V,平均功率达到了11.68 mW,能量转化率达到了11.82%。研究表明推挽式结构在能量采集领域有更优秀的稳定性。

基于抗磁悬浮的摩擦电式振动能量收集器

针对目前传统电池供电方式无法满足无线传感网络需要长期、持久工作的要求,提出了一种基于抗磁悬浮的摩擦电式振动能量收集器,通过将环境中广泛存在的能量转化为电能,实现对无线传感网络长期、稳定的供电。利用搭建的实验测试平台,研究了采集时间、激励加速度及负载电阻对输出性能的影响。实验结果表明,输出电压随着采集时间的增长出现先增大后趋于稳定的趋势;当激励加速度分别为0.2g、0.4g和0.6g时,最大输出电压分别为21.4、29.3和35.6 V,所对应的激励频率分别为19、25和28 Hz;当负载电阻约为1×10^(7)Ω时,振动能量收集器的最大输出功率为123μW,与之相对应的输出电压为38 V。

Observations of mode frequency increase and the appearance of ITB during the m/n=1/1 kink mode in EAST high electron temperature long pulse operation

A new long-pulse high electron temperature(Te)regime has been achieved on experimental advanced superconducting tokamak by pure radio frequency heating.In this new scenario,there are mainly two confinement states involving two magneto-hydrodynamic(MHD)modes,one of which is identified as m/n=1/1 kink mode(where m and n are the poloidal and toroidal mode numbers,respectively).The frequency evolution of the kink mode is investigated through the three-dimensional,toroidal,and nonlinear Hall-MHD code CLT.We firstly find that the frequency of the m/n=1/1 kink mode significantly increases during each sawtooth crash and then confirmed it through the experimental data.The simulation results indicate that the increase of the mode frequency is mainly due to the significant increase of the electron diamagnetic frequency nearby the reconnection region.We have also observed the internal transport barrier(ITB)during the m/n=1/1 kink mode.To further investigate this m/n=1/1 kink mode in this new regime,the multi-scale interactions between the m/n=1/1 kink mode and turbulence are discussed.

Spin selectivity of chiral mesostructured diamagnetic BiOBr films

The chirality-induced spin selectivity(CISS)has been found in the antiferromagnetic and paramagnetic chiral inorganic materials with unpaired electrons,while rarely reported in the spin-paired diamagnetic inorganic materials with spin-pairing energy.Here,we report the CISS in the spin-paired diamagnetic BiOBr endowed with three levels of chiral mesostructures.Chiral mesostructured BiOBr films(CMBFs)were fabricated through a sugar alcohol-induced hydrothermal route.The antipodal CMBFs exhibited chirality-dependent,magnetic field-independent magnetic circular dichroism(MCD)signals,which indicates the existence of spin selectivity.The spin selectivity of CMBFs was speculated to be the result of the competing effect between the externally applied magnetic field and the effective magnetic field arisen from the spin electron motions in chiral potential.The chirality-induced effective magnetic field acts on the magnetic moment of electrons,potentially overcoming the spin-pairing energy and producing opposite energy changes for spin-down and spin-up electrons.

背景气体对激光等离子体和外磁场界面上槽纹不稳定性的影响

等离子体在外磁场中膨胀产生的抗磁腔和不稳定性是空间物理和聚变物理中的重要现象.本文实验研究了激光产生的等离子体在外磁场中膨胀时在抗磁腔表面产生的槽纹不稳定性,数据分析显示实验中观察到的不稳定性属于大拉莫尔半径槽纹不稳定性.实验发现充入稀薄背景气体能够显著抑制槽纹不稳定性的发展,背景气体气压超过50 Pa时(约为抗磁腔表面等离子体密度的1%),槽纹不稳定性几乎被完全抑制.动理学分析表明离子-离子碰撞是抑制不稳定性发展的主要因素.这些结果对磁场辅助激光聚变和爆炸空间物理现象等领域有重要参考价值.

Extrinsic electromagnetic fields, low frequency (phonon) vibrations, and control of cell function: a non-linear resonance system

Chou and Chen’s report in the 1970s suggested conformational protein adaptation (CPA) might be influenced by low frequency phonons acting as “a possible information system”. This report proposes the universal force of electromagnetism initiates the phonon system they cited as it per-turbs paramagnetic/diamagnetic dampers within the protein matrix to produce a quantized low frequency phonon signal series. (http://www.phy.ilstu.edu/~ren/phononsims/page3.html) The signal series is iteratively processed by the protein beta sub-unit, the system, to posi-tion the alpha sub-unit, the outcome, a classic non-linear resonance system resulting in con-formational protein adaptation (CPA). CPA “priming” enables a secondary ATP/redox driven power system to complete cell activity. The evolutionary appearance of these two systems reflects their hierarchy: 1) a low energy phonon driven information control circuit governed by principles of physics that, along with proteins, may have preceded planet earth, and 2), an ATP/redox power completion circuit directed by principles of chemistry that evolved in living systems 1 billion or more years after earth formed.