Multi-Barycenter Mechanics, N-Body Problem and Rotation of Galaxies and Stars

In the present paper, the establishment of a systematic multi-barycenter mechanics is based on the multi-particle mechanics. The new theory perfects the basic theoretical system of classical mechanics, which finds the law of mutual interaction between particle groups, reveals the limitations of Newton’s third law, discovers the principle of the intrinsic relationship between gravity and tidal force, reasonably interprets the origin and change laws for the rotation angular momentum of galaxies and stars and so on. By applying new theory, the multi-body problem can be transformed into a special two-body problem and for which an approximate solution method is proposed, the motion law of each particle can be roughly obtained.

Several teleportation schemes of an arbitrary unknown multi-particle state via different quantum channels

We first provide four new schemes for two-party quantum teleportation of an arbitrary unknown multi-particle state by using three-, four-, and five-particle states as the quantum channel, respectively. The successful probability and fidelity of the four schemes reach 1. In the first two schemes, the receiver can only apply one of the unitary transformations to reconstruct the original state, making it easier for these two schemes to be directly realized. In the third and fourth schemes, the sender can preform Bell-state measurements instead of multipartite entanglement measurements of the existing similar schemes, which makes real experiments more suitable. It is found that the last three schemes may become tripartite controlled teleportation schemes of teleporting an arbitrary multi-particle state after a simple modification. Finally, we present a new scheme for three-party sharing an arbitrary unknown multi-particle state. In this scheme, the sender first shares three three-particle GHZ states with two agents. After setting up the secure quantum channel, an arbitrary unknown multi-particle state can be perfectly teleported if the sender performs three Bell-state measurements, and either of two receivers operates an appropriate unitary transformation to obtain the original state with the help of other receiver＇s three single-particle measurements. The successful probability and fidelity of this scheme also reach 1. It is demonstrated that this scheme can be generalized easily to the case of sharing an arbitrary unknown multi-particle state among several agents.

Probabilistic Teleportation of Multi-particle d-Level Quantum State

The general scheme for teleportation of a multi-particle d-level quantumstate is presented when m pairs of partially entangled particles are utilized as quantum channels.The probabilistic teleportation can be achieved with a successful probability of Π from N=0 to d-1of (C_0~N)~2/d~M, which is determined by the smallest coefficients of each entangled channels.

Hierarchical simultaneous entanglement swapping for multi-hop quantum communication based on multi-particle entangled states

Entanglement swapping is a key technology for multi-hop communication based on entanglement in quantum networks. However, the end-to-end delay of the traditional sequential entanglement swapping (SEQES) grows rapidly withthe increase of network scale. To solve this problem, we first propose a low-delay multi-particle simultaneous entanglementswapping (SES) scheme to establish the remote four-particle Greenberger–Horne–Zeilinger (GHZ) channel states for thebidirectional teleportation of three-particle GHZ states, in which the intermediate nodes perform Bell state measurements,send the measurement results and the Bell state type to the user node Bob (or Alice) through classical channel simultaneously. Bob (or Alice) only needs to carry out a proper unitary operation according to the information he (or she) hasreceived. Further, we put forward a hierarchical simultaneous entanglement swapping (HSES) scheme to reduce the classical information transmission cost, which is composed of level-1 SES and level-2 SES (schemes). The former is an innersegment SES, and the latter is an inter segments SES. Theoretical analysis and simulation results show the HSES can obtainthe optimal performance tradeoff between end-to-end delay and classical cost.

CALCULATION FOR KERNEL OF INTERVAL GREY NUMBER BASED ON BARYCENTER APPROACH

The kernel of interval grey number is most likely the real number,which can be used to represent whitenization value of interval grey number.A novel method for calculating kernel of interval grey number is constructed based on the geometric barycenter of whitenization weight function in the two-dimensional coordinate plane,and the calculation of kernel is converted to the calculation of barycenter in geometric figures.The method fully considers the effect of all information contained in whitenization weight function on the calculation result of kernel,and is the extension and perfection of the existing methods in the scope of application.

Some Results on Riemannean Multiple Barycenters

A characteristic of a special case of Riemannean barycenters on the unit circle is presented. The non-uniqueness of such barycenters leads to an interesting study of the so-called multiple barycenters. In this work, we deal with a smooth one-dimensional manifold S1 only. Some theoretical and computational analysis is listed.

Scheme for Robust Storage of Multi-particle Entanglement with a Cavity QED System

We propose a scheme for robustly storing multi-atom entangled states involving Bell states, three-particle W-state, n-particle W-like-states, generalized multi-particle W-states, n-particle GHZ-states, and partially entangled states in cavity QED. Our scheme can preserve the internal structure of the entangled states above, with only generation of a global phase corresponding to each of entangled states during the storage of them. One single-mode cavity and n identical two-level atoms are required. Our scheme may be realized in the present technology. The idea may be also utilized to store multi-trapped-ion entangled states in linear ion trap.

1-35 Multi-particle Field Operators in Quantum Field Theory

Using bi-spinor fields we write the pseudo-scalar and bi-spinor fields that are characterized by the field functions of coordinates of several particles, namely multi-particle fields. By applying the quantization procedure to these multi-particle fields, hadronic creation and annihilation operators have been obtained.

山地旅游目的地“三生”系统耦合协调时空演化分析——以贵州省为例

以贵州省9个市(州)为例,构建“生产—生活—生态”系统耦合协调评价指标体系,运用加权TOPSIS法对该区三大系统的综合发展水平进行评价,再基于重心模型和耦合协调模型分析“三生”系统的时空耦合态势。结果表明:(1)研究期内,贵州省各市(州)“三生”系统的发展水平不一致,其综合评价指数差异显著。(2)“三生”系统的重心一直位于贵阳市境内,但偏移方向有所不同;“三生”系统两两之间空间耦合性从高到低依次为“生产—生活”系统、“生活—生态”系统、“生产—生态”系统。(3)从时间上看,“三生”系统耦合协调度以波动上升和保持稳定为主,空间上呈现出以贵阳、遵义为核心的“核心—边缘”式结构特征。

基于合作博弈的B2B供应链金融收益分配研究

随着互联网技术在传统供应链金融领域的广泛运用,传统供应链金融与电子商务相互融合,推动了线上供应链金融的发展,第三方B2B平台开始与商业银行合作,基于第三方B2B平台的供应链金融模式应运而生。文章以电子仓单质押融资模式为例,运用博弈论的思维和方法构建电子仓单融资博弈模型,得出各参与主体非合作与合作时的期望收益,并在传统的合作博弈Shapley值的基础上,综合考虑影响B2B供应链融资参与方收益分配的影响因素,运用云重心法改进Shapley值。算例分析表明:云重心法改进的Shapley值能更合理公平的分配各参与方的收益,使得供应链间运作更加协调与稳定。

基于面板数据的灰色重心三角网格关联分析模型

针对现有面板数据曲面簇的构造以及指标排列顺序改变引起关联度结果不唯一问题,提出了基于面板数据的灰色重心三角网格关联分析模型。首先,将样本矩阵分解为二元指标子矩阵,并将其投射为空间四面体网格。然后,利用空间几何学给出四面体的重心,并与四顶点相连得到重心三角曲面。其次,基于重心三角曲面为曲顶的柱体体积构建了灰色关联系数公式,并得到了面板数据的灰色重心三角网格关联分析模型。最后,所提出的模型成功应用到山东省东西沿线6城市的空气质量评估,验证了模型的合理性和有效性,结果表明所提出模型能够测度面板数据间的相关程度。

质心动态路径规划的变转速齿轮箱时频脊线索引算法

针对强噪声下难以估计信号瞬时频率的问题,提出了基于质心动态路径规划(DPPB)的变转速齿轮箱时频脊线索引算法。该算法在剖析多路径匹配追踪(MMP)脊线索引算法及其在强噪声下失效原因的基础上,通过对MMP算法得到的脊线集加窗求质心,构建信号的脊线质心稀疏矩阵,并针对质心稀疏矩阵设计动态路径规划函数索引脊线上的质心点,根据脊线代价函数值计算最优时频脊线。将相似度系数Ra和置信度σRa作为脊线提取效果的衡量指标,通过仿真和试验验证了DPPB算法可有效提取强噪声信号的时频脊线,且不同程度噪声下的可靠性和鲁棒性均优于峰值索引算法和MMP脊线索引算法。

中国耕地面积-粮食产量重心迁移轨迹特征及空间错位关系

为了探究粮食资源和耕地利用效率的协调统一,利用2000—2019年中国耕地面积和粮食产量数据,以省域为研究对象,基于重心模型和空间错位指数,系统分析全国耕地面积、粮食产量重心迁移轨迹特征及空间错位关系。结果表明:研究期内耕地面积重心与粮食产量重心变化方向不尽相同,耕地面积重心从河南省博爱县向东北移动,而粮食产量重心则先从河南省舞阳县向东北后再向东向平移;全国的粮食产量和耕地面积主要集中在中水平区和中低水平区,且由东到西呈现正向错位到负向错位的分布特征;耕地面积和粮食产量受资源禀赋影响较大,但经济发展水平、人口、降水量和积温水平等因素也具有一定的推动作用。

基于ADAMS的连续采煤机整机重心动力学仿真分析

连续采煤机重心位置直接影响其稳定性、截割效率和接地比压等整机重要性能参数。针对设计过程中连续采煤机不同位姿下整机重心计算过程复杂、变化轨迹不直观的问题,采用动力学仿真软件建立了连续采煤机多刚体动力学模型,对连续采煤机在不同位姿下的重心位置及位姿变换过程中重心变化轨迹进行分析,最后对该分析方法进行总结并得出结果。

2001—2020年云南省PM_(2.5)时空格局及演变分析

基于重心模型和空间自相关等分析方法,利用卫星遥感、人工智能和大数据生成的2001—2020年近地表大气污染物数据集中的PM_(2.5)浓度数据集,综合分析云南省2001—2020年PM_(2.5)浓度时空演变特征,并探讨其空间异质性成因.结果表明:①以2013年为拐点,前13年PM_(2.5)浓度缓慢增长,后7年则急剧下降.主导区间近地面层大气中PM_(2.5)浓度于2015年发生明显变化,由25~35μg/m^(3)和35~50μg/m^(3)变为15~25μg/m^(3)和25~35μg/m^(3).②后7年年均PM_(2.5)浓度较前13年大幅减弱,滇西北和滇中地区减弱程度较滇西南和滇南地区明显,使得研究时段PM_(2.5)浓度重心南移19.8 km.③乡镇PM_(2.5)浓度存在显著的空间正相关性,但相关强度随时间减弱;2015年和2020年PM_(2.5)浓度高—高集聚的热点区域较前面年份扩张明显,基本覆盖滇西南和滇南区域;低—低集聚冷点区域成片分布于滇西北至滇中北部.④气象要素、地理位置、地形因子和上风方生物质燃烧释放的污染物影响差异,是造成云南省大气中PM_(2.5)浓度时空格局及演变的主要驱动力.

单纯形重心法复配多糖/纳米纤维素水凝胶

以海藻酸钠(SA)、黄原胶(XAN)、结冷胶(G)和纳米纤维素(NC)为水凝胶壁材,并采用{4,4}单纯形重心法进行试验设计筛选出最佳配方。对水凝胶的形态、质构特性、pH敏感性和傅里叶变换红外光谱进行分析。结果表明,添加NC增加水凝胶共混溶液的黏度,改善了表观形态、增强水凝胶的质构特性;傅里叶变换红外光谱显示NC和多糖之间具有良好的相容性,添加NC后提高水凝胶的膨胀率,复配的多糖/纳米纤维素水凝胶具有良好pH值敏感性。最后通过单纯形重心法得到理论最优组(SA19.25%;XAN24.10%;G41.00%;NC15.23%)。综上所述,最终成功采用单纯形重心法成功复配出具有良好的pH敏感性、稳定通过模拟胃环境的纳米水凝胶,这为复合水凝胶包埋需氧益生菌提供基础数据,且为研究与应用水凝胶递送系统提供了参考。

半挂牵引列车质心位置计算方法

车辆质心位置测量是汽车设计、制造和检测过程中的重要参数,对于车辆质量有重要影响。如何测量车辆质心,提高质心测量和计算精度,变得更加重要。文章以车辆质心位置为主要研究对象,列举了纵倾法、侧倾法、摇摆法、悬挂法和零位法的主要质心位置测量原理,详细分析介绍了纵倾法和侧倾法的原理及计算推导过程。以如何进行半挂牵引列车质心位置计算方法为主要研究内容,通过测量和理论计算相结合的手段,提出了一种半挂牵引列车质心位置计算方法,对实际工程应用有一定的借鉴作用。

我国畜牧产业集聚的时空变迁与影响因素分析

文章采用区位熵指数、空间基尼系数和重心模型对2002—2021年我国畜牧产业集聚时空变迁特征进行分析。在此基础上,构建固定效应模型探究畜牧产业集聚影响因素。结果表明,2002—2021年我国畜牧产业集聚程度呈现不断提升趋势,畜牧产业集聚重心长期集中在河南和四川地区,畜牧产业逐渐由东部向中部地区集聚。技术投入、产业关联度、经济发展水平和政策环境均对畜牧产业集聚具有正向影响,而劳动力数量对畜牧产业集聚的影响不显著。因此,文章提出加快推动畜牧产业集群化发展,驱动优质畜牧产业要素向中部地区偏移,强化畜牧产业集聚政策支持的建议,为推动畜牧产业高质量发展提供参考。

成都市地下物流系统节点选址研究

随着城市可持续发展的推进,地下物流系统作为一种全新的物流方式,以其新型的运输和供应系统受到广泛关注,相较于传统物流运输方式,有着低能耗、绿色环保、高效、节省空间等诸多优势。现针对地下网络物流节点的选址问题,使用重心方法,以四川省成都市某个城区为代表,从定性和客观定量两个角度,对未来地下网络物流节点的选址问题进行了深入分析,希望能够借此广泛地运用科学技术手段,提高城市网络物流的运作效率,释放城市交通的压力,避免城市环境污染。

基于主动重心的青年高血压患者心肺运动时序数据增强

精准医疗的逐步兴起,如挖掘青年高血压患者的心肺运动时序数据,可以了解不同个体对有氧运动训练的响应性,有助于提高患者高血压管理计划的制定效率,更有效地实现有氧运动干预的治疗。开展该研究的瓶颈之一在于难以获取充足的样本数据。为了解决获取数据难度大、成本高等问题,利用加权动态时间规整重心平均算法来进行时间序列数据增强,重点针对重心选择和权重分配进行了研究。针对重心选择问题,首次引入了主动重心的概念,提出了代表性重心与多样性重心选择策略,改善了数据增强的效果。此外,针对现有权重分配策略的不足,提出了随机权重距离递减分配策略,避免了合成重复样本,进一步提升了模型的泛化能力。实验结果表明,在该研究背景下同时考虑重心选择与权重分配进行数据增强,可以进一步提升青年高血压患者有氧运动干预疗效预测的准确性。