Relativistic Reduction of the Electron-Nucleus Force in Bohr’s Hydrogen Atom and the Time of Electron Transition between the Neighbouring Quantum Energy Levels

The aim of the paper is to get an insight into the time interval of electron emission done between two neighbouring energy levels of the hydrogen atom. To this purpose, in the first step, the formulae of the special relativity are applied to demonstrate the conditions which can annihilate the electrostatic force acting between the nucleus and electron in the atom. This result is obtained when a suitable electron speed entering the Lorentz transformation is combined with the strength of the magnetic field acting normally to the electron orbit in the atom. In the next step, the Maxwell equation characterizing the electromotive force is applied to calculate the time interval connected with the change of the magnetic field necessary to produce the force. It is shown that the time interval obtained from the Maxwell equation, multiplied by the energy change of two neighbouring energy levels considered in the atom, does satisfy the Joule-Lenz formula associated with the quantum electron energy emission rate between the levels.

天然气管道可靠性增长预测方法研究

为减少天然气管道投产前的设计和制造缺陷,提高使用寿命、运行可靠性和安全性、减少后期维修费用,通过统计模型结合试验数据实现对天然气管道可靠性增长水平的预测,提出天然气管道可靠性增长预测方法;分析常用可靠性增长模型并结合天然气管道可维修、小子样的特点,将Duane模型与AMSAA模型应用于天然气管道,结合点估计、趋势检验、拟合优度检验、区间估计和标准差,得出天然气管道可靠性增长模型,预测可靠性增长并进行实例验证。研究结果表明:Duane模型与AMSAA模型作为天然气管道可靠性增长试验具有可行性;其中AMSAA模型更具优势,得出天然气管道的瞬时无故障工作时间(MTBF)估计值可达到试验目标值,并预测MTBF达到2000 h时所需要的试验时间为317954611.3 h,未来第51次故障预测区间为[848.4609,939.6226],误差为1.25%,方法具有良好的适用性,可有效预测天然气管道可靠性增长。研究结果可为天然气管道设计改进提供指导。

基于大数据分析的高校多媒体设备可靠性研究

随着教育事业发展,多媒体教学成为各高校最普遍、使用频率最高的教学模式。充分利用多媒体设备运行数据优化管理工作,延长设备使用寿命,降低设备维护成本,始终是教育技术部门关注的问题。通过对天津大学卫津路校区6年来多媒体设备报修数据进行统计分析,利用SPSS分析软件对2020和2021年的数据进行线性回归,分析总报修数量与年度使用时间和设备实际使用年限的线性相关性;基于平均故障间隔时间对近2年的硬件报修进行分设备类型统计,从概念引入到推导计算,均给出详细验证过程。结合对非硬件问题造成的软件报修的前5位问题进行详细分析,据此提出设备更新科学化,定期巡检规范化和培训方式多样化的对策建议。

Estimation Accuracy for Reciprocal Analysis of Sensible and Latent Heat Flux Focusing on Radiometric Temperature and Lag-Time

There is no word to describe the importance of evapotranspiration research for water resource utilization. We have already proposed a new method for the reciprocal estimation of the sensible (H) and latent heat fluxes (lE) by using a single height temperature (Tz) and humidity (rehz) based on the observed net radiation (Rn) and ground heat flux (G). This research is more advanced than the previous research because it uses a Ts observed by a radiometer and identifies the observed data satisfactorily heat balance relationship in every hour at nine sites. First, we confirmed that the estimated H and lE are very close reproductions of the identified H and lE. Second, by analyzing the relative ground surface temperature (Ts - T0) [Ts: ground surface temperature, T0: observed temperature near the soil surface], the hourly and seasonal changes of (Ts - T0) were clarified, resulting in a marked difference in the (Ts - T0) from previous research in arid and semi-arid regions. Next, the estimation accuracy of H, lE and rehs (the humidity of the soil surface) was determined by observing the slope of the estimated and observed relationship, resulting in the reasonable accuracy (0.85 - 1.15 times) of rehs at seven of the nine sites. Furthermore, the annual evapotranspiration was estimated by comparing the identified and estimated H and lE, resulting in a reasonable accuracy (0.85 - 1.15) at five of the nine sites in the case of the application of constraint b. Moreover, the effect of the lag-time between the net radiation Rn and both Tz and Ts for the estimation accuracy on H and lE was tested, and no remarkable difference was found because the effect was included already in the original data. The above results will contribute greatly to the advance of water resource planning and hydrometeorology. This research was conducted using FLUXNET data.

CT在使用前期阶段的可靠性数据分析

目的分析CT设备在使用中的可靠性数据,健全设备可靠性分析评价指标的理论框架,探索设备可靠性评价的实践方法,为不同CT设备间性能对比提供实用的参考方案。方法以新启用CT设备前2年数据为对象,依据可靠性理论构建性能对比框架。根据设备厂商提供的工单维修记录,统计比较单台CT设备装机后第1年、第2年与前2年工单中与可靠性、维护性和保障性参数相关的数据,以及比较装机后第1年、第2年的维修时长、故障时长和维修间隔。结果设备装机后第1年、第2年、前2年的各项可靠性参数表现优良程度依次为第1年、前2年、第2年。第2年维修时长和故障时长较第1年有所增加,维修间隔较第1年缩短,但差异无统计学意义(P>0.05)。CT设备在装机后前2年整体运行状态较为平稳,第2年略有下降。结论本研究建立的维修数据分析和评价体系可为提高设备可靠性提供参考信息,为不同CT设备间性能对比提供参考方案,推动CT技术持续进步及行业标准化。

The mean first passage time of a three-level atomic optical bistable system subjected to noise

The transient properties of a three-level atomic optical bistable system in the presence of multiplicative and additive noises are investigated. The explicit expressions of the mean first-passage time （MFPT） of the transition from the high intracavity intensity state to the low one are obtained by numerical computations. The impacts of the intensities of the multiplicative noise DM and the additive noise DA, the intensity of correlation between two noises λ, and the intensity of the incident light y on the MFPT are discussed, respectively. Our results show： （i） for the case of no correlation between two noises （2, = 0.0）, the increase in DM and DA can lead to an increase in the probability of the transition to the low intracavity intensity state, while the increase in y can lead to a retardation of the transition; and （ii） for the case of correlation between two noises （λ≠ 0.0）, the increase in λ can cause an increase in the probability of the transition, and the increase in DA can cause a retardation of the transition firstly and then an increase in the probability of the transition, i.e., the noise-enhanced stability is observed for the case of correlation between two noises.

基于不同统计模型对压力蒸汽灭菌器故障数据集的可靠性分析

目的:基于医院压力蒸汽灭菌器的故障数据,分析评估医疗机构中压力蒸汽灭菌器的可靠性。方法:利用威布尔分布(Weibull分布)、指数分布(Exponential分布)、对数-正态分布(Log-Normal分布)和q-威布尔分布(q-Weibull分布)4种统计模型对压力蒸汽灭菌器的故障数据进行分析,并使用图表工具展示不同分布统计模型在拟合数据时的性能。结果:4种统计模型对比显示,Log-Normal分布统计模型的修正赤池信息准则为564.4512,贝叶斯准则(568.7691)值最低,柯尔莫哥洛夫-斯米尔诺夫(KS)统计量(0.0739)最小,P值最大(P>0.05),表明分布拟合效果最好,最适合用于分析压力蒸汽灭菌器故障数据集的模型。结论:通过使用不同统计模型对压力蒸汽灭菌器故障数据的可靠性分析,可以为临床工程师优化压力蒸汽灭菌器维护策略提供依据。

Differences in Informal Time System and Intercultural Communication

Informal time system refers to the assumption that cultures make about how time should be used or experienced. In this essay, three related aspects of informal time system are discussed, i.e. monochronic time system vs. polychronic time system, sequence of events and interval between events. Different cultures are compared with respect to the three aspects. The differences in the three aspects and the impacts on intercultural communication have been highlighted in each part.

A TIME DOMAIN BOUNDARY ELEMENT METHOD FOR WATER-SOLID IMPACT ANALYSIS

A reciprocal theorem of dynamics for potential flow problems is first derived by means of the Laplace transform in which the compressibility of water is taken into account. Based on this theorem, the corresponding time-space boundary integral equation: is obtained. Then, a set of time domain boundary element equations with recurrence form is immediately formulated through discretization in both time and boundary. After having carried out the numerical calculation two solutions are found in which a rigid semicircular cylinder and a rigid wedge with infinite length suffer normal impact on the surface of a half-space fluid. The results show that the present method is more efficient than the previous ones.

无人机系统MTBF和使用可用度的建模与仿真

针对无人机系统组成结构复杂、影响其可靠性可用性的维修保障因素较多的问题,基于设备寿命分布假设,构建了考虑预防性维修和起飞前故障检查的系统平均故障间隔时间(mean time between failures,MTBF)和使用可用度解析模型。并模拟无人机的维修过程,采用蒙特卡罗仿真的方法进行MTBF和使用可用度的仿真分析。解析与仿真两种方法的结果具有较好的一致性,可为无人机确定保障方案提供技术途径。

“一站式”检查智能预约平台的设计与实现

为解决门诊病人检查、预约难的问题,改善患者就医体验。该文借鉴流程优化、业务重组及分时段预约的理念和方法,提出“一站式”检查智能预约平台的构建。该平台的应用,系统能自动完成预约60%的门诊检查项目,患者减少了2次排队,检查等候时间平均缩短50 min。“一站式”检查智能预约平台的搭建,真正实现让患者“看病少排队”、“检查少跑腿”,在创造良好的就医环境、提高医院服务品质等方面具有重要意义。

Time of the Energy Emission in the Hydrogen Atom and Its Electrodynamical Background

The time of the energy emission between two neighbouring electron levels in the hydrogen atom has been calculated first on the basis of the quantum aspects of the Joule-Lenz law, next this time is approached with the aid of the electrodynamical parameters characteristic for the electron motion in the atom. Both methods indicate a similar result, namely that the time of emission is close to the time period of the electromagnetic wave produced in course of the emission. As a by-product of calculations, the formula representing the radius of the electron microparticle is obtained from a simple combination of the expressions for the Bohr magnetic moment and a quantum of the magnetic flux.

GPS time-series and its response to M_S=8.1 Kunlunshan earthquake

In this paper, observation data in 25 GPS reference stations of China have been analyzed by calculating GPS position coordinate time-series with GIPSY. Result shows there is an obvious trend variation in such time-series. The trend variations of time series along the longitude and latitude coordinate reflect the motion of each position in the global-plate, in which the trend variation in the vertical direction reveals some large-scale construction information or reflects the local movement around the positions. The analysis also shows that such time-series have a variation cycle of nearly 1.02 a, but the reason still remains to be further studied. At the end of this paper, response of the time-series to MS=8.1 Kunlunshan earthquake was analyzed, and the seismogenic process of MS=8.1 Kunlunshan earthquake, according to the time proceeding and the feature of anomaly, was divided into 3 phases-changes in blocks with forces, strain accumulation, quick accumulation and slow release of energy. At the initial stage of seismogenic process of MS=8.1 earthquake and at the imminent earthquake, coseismic process as well as during the post earthquake recovery, anomaly in vertical direction is always in a majority. The anomalous movement in vertical direction at the initial stage resulted in a blocking between faults, while at the middle stage of seismogenic process, the differential movement between blocks are in a majority, which is the major reason causing energy accumulating at the blocking stage of faults.

在实然与应然的张力关系中揭示河北艺术的复杂面向

一般说来,地理环境和行政区划是构成地方艺术特色的主要因素。河北地处游牧与农耕的交汇地带,农牧之争形成的冲突与融合铸就了河北艺术的第一重底色,草原文明的自由奔放与农耕文明的质朴典雅冲撞融汇之后形成了慷慨激昂的燕赵悲歌:酣畅淋漓的游侠精神、视死如归的悲壮体验、天马行空的想象力、质朴刚健的生命力成为早期河北艺术精神的主调。与此同时,由于南部(古邺城)地区处于中原文明的核心区域,来自农耕文明核心区域的审美情调与艺术追求也深刻影响了河北地方艺术。随着地方行政区域的变化及统治中心的转移,河北艺术不断更迭、变迁,显现出明显的地方特质和与官方意识形态相谐和的状态。比较而言,早期地理环境因素对河北艺术的影响作用更为明显,而后期行政区划的影响则逐渐占据中心。无论如何发展,古代河北艺术都体现出了与时代精神相一致的内涵与特点。

金属矿山硬岩巷道分阶段掏槽爆破数值模拟研究

针对地下金属矿山深部硬岩强度高,掏槽难度大,掘进效率低下的问题,以首钢杏山地下铁矿巷道掘进项目为背景,基于数码电子雷管精准逐孔起爆,提出针对直眼桶形掏槽爆破的掏槽区孔内分段与孔间、孔内延时相结合的分阶段爆破方案。采用数值模拟以及现场试验方式,在现场原传统方案的基础上,对掏槽区炮孔进行孔内分段、孔间以及孔内微差起爆的分阶段起爆设置。通过LS-DYNA数值模拟软件建立掏槽区三维模型,设置了原传统方案和3种分阶段方案进行模拟计算,对比分析了原传统爆破方案和分阶段方案在掏槽区的有效应力峰值演化情况。数值模拟结果表明:采用孔间短延时分阶段爆破方案能够改变有效应力峰值波动形态,与原传统方案相比,掏槽区沿炮孔方向岩体的有效应力峰值状态提升40%~57%,炮孔底部0~30 cm半径岩体有效应力峰值状态提升幅度在84%~92%。在数值模拟结果的基础上,开展了现场试验验证,现场试验表明:在矿石点位掘进中,采用孔间短延时微差起爆能够改善碎石挤死的现象,采用孔内短延时微差起爆能够提高抛掷能力,改善上段炮孔爆破后产生碎石的抛掷效果,避免影响后续炮孔爆破,在硬岩爆破中二者结合可以明显改善爆破效果,掏槽进尺提高28%;在岩石点位掘进中,采用孔间短延时,孔内长延时设置能获得良好的掘进效果。

系列小分子液体中α弛豫与探针离子电导行为的对比

液体中平动和转动的耦合性是凝聚态物理长期关注的问题之一,本文采用介电谱方法同时获得了系列小分子液体中α弛豫的弛豫时间和探针离子的电导率.样品包括具有不同分子形状和官能团的碳原子数跨度在3—14范围内的15种一元和二元小分子液体.分析结果表明平动和转动的耦合性与液体分子的官能团并没有直接的对应关系,对分子形状、大小和离子大小也不是十分敏感,但是液体的微观结构是影响平动和转动耦合性的重要因素.也就是,无论在一元还是二元体系中,液体的微观结构没有改变时电导率的倒数和弛豫时间与温度的依赖关系具有一致性,这也为弛豫时间的测量提供了一种方法.研究结果还表明,液体中自身携带的杂质离子与定量掺入离子的电导率的温度依赖关系相同,为电解质溶解度低的有机小分子液体中离子电导率行为的研究提供了思路.本文中单羟基醇的实验结果也与单羟基醇中α弛豫而非Debye弛豫对应于体系结构弛豫的观点相一致.

地铁隧道通风系统设备故障统计分析及RAM指标分配

通过调研华南某地区3条地铁线路近五年隧道通风系统故障数据,分析设备运营维护薄弱环节,得到隧道通风系统各关键设备的故障类型、故障原因以及各设备类型的故障数目和比例,提供故障检修及维护建议;综合考虑设备故障率和设备数量,结合各设备故障数和平均修复时间MTTR,计算隧道风系统各关键设备平均无故障工作时间MTBR,该RAM指标可供同行参考。

考虑场间功率时移的海上风电场群联合储能优化调度方法

相邻海上风电场间因尾流效应产生功率时移能力,可为海上风电场群参与电网有功优化调度提供有效支撑。提出一种考虑场间功率时移的海上风电场群联合储能优化调度方法。首先,基于海上风电场群功率预测与电网有功调度计划量化风电场群功率跟踪需求;计及风速传播时间建立场间功率时移模型,利用风电场间功率时移能力参与电网调度;针对出力偏差协调储能进一步跟踪调度计划。然后,以系统运行成本最小为目标,构建考虑场间功率时移的海上风电场群储能优化调度模型。最后,以某实际海上风电场群储能系统为例进行仿真验证,结果表明所提方法能够利用相邻海上风电场间功率时移能力,有效降低储能调用成本,实现海上风电场群对电网有功调度计划的跟踪。

面向任务的空间信息网络关键节点分析模型

为了挖掘真实任务场景下空间信息网络中的关键节点并着重对其加以保护,从空间信息网络在体系背景下承担的使命任务出发,借助作战环理论对其中的节点类型和信息流动关系予以区分,考虑空间信息网络的高动态性,利用时变图的分析方法对网络进行建模。在空间信息动态网模型的基础上考虑作战环的形成时长赋予作战环价值系数,结合传统复杂网络指标提出了空间信息网络在面向任务时的节点重要性评价指标——时效环介数。通过实验仿真,对比时效环介数与度中心性、以作战环数量为指标的节点重要度,从方法本质上说明了在任务场景下通过时效环介数分析得到的关键节点有效性和合理性。

呼吸机自动报警装置联合风险防范对急性呼吸窘迫综合征患者的效果

目的:探究临床对急性呼吸窘迫综合征(ARDS)患者护理时开展呼吸机自动报警装置联合风险防范干预对患者睡眠质量的影响。方法:选取2022年4月至2023年10月厦门大学附属第一医院收治的ARDS患者88例作为研究对象,按照随机数字表法分为对照组和观察组,每组44例。对照组患者开展常规护理,观察组患者开展呼吸机自动报警装置联合风险防范干预。针对2组睡眠质量、血气水平以及通气时间等对比。结果:对比2组干预前后睡眠质量评分,干预后观察组较对照组低,差异有统计学意义(P<0.05)。对比患者血气水平,动脉血氧分压、二氧化碳分压,干预后观察组血氧分压高于对照组,二氧化碳分压低于对照组,差异有统计学意义(P<0.05)。对比患者通气时间、谵妄发生率,观察组均较对照组低,差异有统计学意义(P<0.05)。日平均睡眠时间、夜间最长连续睡眠时间,观察组干预后长于对照组,差异有统计学意义(P<0.05)。结论:在对ARDS患者护理时开展呼吸机自动报警装置联合风险防范干预,可以提升患者睡眠质量,改善患者血气水平,降低气道阻力,缩短通气时间,降低谵妄发生率,有助于患者恢复。