Effects of Strong Turbulence on the Spiral Plane Mode of Whittaker-Gaussian Beam through Terrene-Atmosphere

The analytic formulae of probability distribution of spiral plane modes for the Whittaker-Gaussian （WG） beams with orbital angular momentum （OAM） in strong turbulence regime are modeled based on the modified Rytov approximation. Numerical results show that the erosstalk range of OAM modes in the vicinity of signal mode increases with the increasing refractive-index construction parameter. However, effects of change of the width of the Gaussian envelope and the parameter Wo of WG beams on normalization energy weight of signal mode can be ignored. We find theoretically that signal spiral plane mode of WG beams at each OAM level approximatively has the same normalization energy weight, implying that the channels with WG （pseudo non-diffraction） beam have higher channel capacity than the channels with the Laguerre-Gaussian beam.

Out-of-plane shear flow effects on fast magnetic reconnection in a two-dimensional hybrid simulation model

The effects of out-of-plane shear flows on fast magnetic reconnection are numerically investigated by a two- dimensional （2D） hybrid model in an initial Harris sheet equilibrium with flows. The equilibrium and driven shear flows out of the 2D reconnection plane with symmetric and antisymmetric profiles respectively are used in the simulation. It is found that the out-of-plane flows with shears in-plane can change the quadrupolar structure of the out-of-plane magnetic field and, therefore, modify the growth rate of magnetic reconnection. Furthermore, the driven flow varying along the anti-parallel magnetic field can either enhance or reduce the reconnection rate as the direction of flow changes. Secondary islands are also generated in the process with converting the initial X-point into an O-point.

Influence of spin-orbit coupling induced by in-plane external electric field on the intrinsic spin-Hall effect in a Rashba two-dimensional electron gas

We study theoretically the influence of spin-orbit coupling induced by in-plane external electric field on the intrinsic spin-Hall effect in a two-dimensional electron gas with Rashba spin-orbit coupling. We show that, after such an influence is taken into account, the static intrinsic spin-Hall effect can be stabilized in a disordered Rashba twodimensional electron gas, and the static intrinsic spin-Hall conductivity shall exhibit some interesting characteristics as conceived in some original theoretical proposals.

Effects of Numerical Methods on the Calculation of Developing Plane Channel Flow

In wall-bounded turbulent flow calculations, the past focus has been directed to the modelling of the Reynolds-stress gradients. Not much attention has been paid to the effects of the numerical methods used to calculate these terms and the modelled equations. Discrepancies between model calculations and measurements are quite often attributed to incorrect modelling, while the suitability and accuracy of the numerical methods used are seldom scrutinized. Instead, alternate near-wall and Reynolds-stress models are proposed to remedy the incorrect turbulent flow calculations. On the other hand, if care is not taken in the numerical treatment of the Reynolds-stress gradient terms, physically unrealistic results and solution instability could occur. Previous studies by the author and his collaborators on the effects of numerical methods have shown that some of the more commonly used numerical methods could enhance numerical stability in the solution procedure but would introduce considerable inaccuracy to the results. The flow cases chosen to demonstrate these inaccuracies are a backstep flow and flow in a square duct, where flow complexities are present. The current investigation attempts to show that the above-mentioned effects of numerical methods could also occur in the calculation of a developing plane channel flow, where flow complexities are absent. In addition, this study shows that the results thus obtained lead to a predicted skin friction coefficient that is influenced more by the numerical method used than by the turbulence model invoked. Together, these results show that numerical treatment of the Reynolds-stress gradients in the equations play an important role, even for a developing plane channel flow.

多平面低温等离子射频消融术对OSAHS患者的临床疗效及对免疫功能、生活质量的影响

目的探究多平面低温等离子射频消融术(LTPRA)对阻塞性睡眠呼吸暂停低通气综合征(OSAHS)患者的临床疗效及对免疫功能、生活质量的影响。方法选取2020年1月—2024年1月徐州市中心医院新城分院耳鼻喉科收治的OSAHS患者128例为研究对象,根据随机数字表法分为对照组和观察组。对照组采用等离子辅助下改良悬雍垂腭咽成形术(H-UPPP)治疗,观察组采用多平面LTPRA治疗。比较2组患者临床疗效及治疗前后相关症状、免疫功能、生活质量评分变化。结果观察组临床治疗总有效率显著高于对照组(98.28%vs.80.65%,χ^(2)/P=4.550/<0.001);与治疗前比较,术后3 d时2组OSAHS患者睡眠呼吸暂停低通气指数(AHI)降低,最低血氧饱和度(LSAT)升高,且观察组降低/升高较对照组更显著(t/P=4.931/<0.001,6.330/<0.001);术后3 d时2组OSAHS患者CD4^(+)T淋巴细胞、CD4^(+)/CD8^(+)降低,CD8^(+)T淋巴细胞升高,且观察组升高/降低幅度大于对照组(t/P=6.993/<0.001、2.955/0.004、9.879/<0.001);术后6个月,2组OSAHS患者睡眠呼吸暂停生活质量指数(SAQLI)评分均较术前升高,观察组SAQLI评分高于对照组(t/P=9.877/<0.001)。结论多平面LTPRA能够有效改善OSAHS患者的机体免疫和生活质量,增强临床疗效。

岩溶区高陡岩质边坡崩塌变形破坏机制研究

针对岩溶区某在建高速公路隧道边仰坡发生严重崩塌变形破坏案例,开展地质调绘、工程测量、工程物探、工程钻探等综合手段,查明崩塌区工程地质条件,采用UDEC离散元方法对其崩塌变形破坏机制进行研究。结果表明:本次严重崩塌变形破坏的成因是受地质构造影响,沿高陡岩质边坡节理裂隙及卸荷裂隙发育的溶隙溶槽在强降雨入渗及隧道开挖应力重分布作用下,形成楔形崩塌变形,从而诱发溶蚀凹槽填充物发生牵引滑塌;整个崩塌过程可分为启动加速、高速运动、碰撞减速和缓动夯实等四个阶段,整个崩塌体运动距离超过100 m,严重威胁隧道施工和运维安全;提出分级放坡+坡面防护+明洞+短路基的处治方案,治理效果良好。

竖脊肌平面阻滞联合星状神经节阻滞在老年腹腔镜全子宫切除术中的应用效果

目的探究竖脊肌平面阻滞(ESPB)联合星状神经节阻滞(SGB)在老年腹腔镜全子宫切除术(LTH)中的应用效果。方法选取连云港市妇幼保健院2021—2023年收治的116例行LTH的老年病人,采用随机数表法分成2组,每组58例。在麻醉诱导前,对照组予以ESPB,联合组予以ESPB联合SGB。比较2组手术指标、麻醉药物用量、VAS评分、补救镇痛情况、术后恢复、应激指标、不良反应情况及麻醉诱导前(T0)、麻醉后5 min(T1)、术毕(T2)时刻的心率(HR)和平均动脉压(MAP)。结果2组手术时间、术中出血量、术后首次下床时间、住院时间及不良反应发生率差异均无统计学意义(P>0.05);联合组丙泊酚、舒芬太尼用量及镇痛泵按压次数、补救镇痛率、术后首次排气时间均低于对照组(P<0.05)。术后6、12、24 h,2组VAS评分均逐渐下降,且联合组低于对照组(P<0.05)。2组T1、T2时刻MAP、HR水平均较T0时刻升高,T2时刻较T1时刻下降,但联合组T1、T2时刻MAP、HR水平均低于对照组(P<0.05)。术后2组皮质醇(Cor)、P物质(SP)水平均高于术前,但联合组低于对照组(P<0.05)。结论行LTH的老年病人应用ESPB联合SGB可有效提升镇痛效果,减少镇痛药物用量,维持血流动力学稳定,减轻应激反应,且安全可靠。

Prediction of the dynamic effective properties of particle-reinforced composite materials

The prediction behaviors of some coherent plane wave equations for the effective velocities and attenuations of the coherent plane waves propagating through a composite material and for the effective elastic moduli of the composites are studied. The numerical results obtained by Waterman & Truell's, Twersky's and Gubernatis's equations for Glass-Epoxy composites with various volume fractions are compared. It is found that the predictions by both Twersky's and Gubernatis's equations underestimate the effective velocities and the effective elastic moduli when compare with the predictions by Waterman & Truell's equation. Furthermore, the deviations are more evident for the shear wave than that for the longitudinal wave. But these deviations decrease gradually with the increase of the frequency and increase gradually with the increase of the volume fraction.

亚麻醉剂量艾司氯胺酮联合肋缘下腹横肌平面阻滞在机器人辅助根治性膀胱切除术患者中的应用效果

目的:探讨亚麻醉剂量艾司氯胺酮联合肋缘下腹横肌平面阻滞(STAPB)对机器人辅助根治性膀胱切除术(RARC)患者镇痛效果、应激反应、苏醒质量及情绪的影响。方法:选取宝鸡市人民医院于2023年8月—2024年2月行RARC的70例患者,按照随机数字表法分为对照组(给予常规麻醉联合STAPB,35例)和研究组(给予亚麻醉剂量艾司氯胺酮联合STAPB,35例),比较两组临床指标。结果:两组患者术后疼痛数字分级评分法(NRS)评分随着时间变化呈降低趋势,且研究组NRS评分均低于对照组(P<0.05);在术前(T0)、手术开始后10min(T1)、拔管后5 min(T2),两组DBP先降低后升高,T1、T2时研究组DBP高于对照组;研究组SBP先降低后升高,对照组SBP先升高后降低,T1、T2时研究组SBP低于对照组;两组HR先升高后降低,T1、T2时研究组HR低于对照组(P<0.05);研究组苏醒相关时间均短于对照组,拔管后15 min、30 min的Steward苏醒评分表评分高于对照组(P<0.05);术后3 d两组患者焦虑自评量表(SAS)、抑郁自评量表(SDS)评分均降低,各项炎症因子水平均升高,研究组低于对照组(P<0.05);两组患者术后并发症总发生率相比,差异无统计学意义(P>0.05)。结论:RARC患者使用亚麻醉剂量艾司氯胺酮联合STAPB,可减轻机体应激反应和炎症反应,缓解焦虑抑郁症状,苏醒质量较高,且有一定安全性,临床应用效果较好。

Optical simulation of in-plane-switching blue phase liquid crystal display using the finite-difference time-domain method

The finite-difference time-domain method is used to simulate the optical characteristics of an in-plane switching blue phase liquid crystal display.Compared with the matrix optic methods and the refractive method,the finite-difference timedomain method,which is used to directly solve Maxwell＇s equations,can consider the lateral variation of the refractive index and obtain an accurate convergence effect.The simulation results show that e-rays and o-rays bend in different directions when the in-plane switching blue phase liquid crystal display is driven by the operating voltage.The finitedifference time-domain method should be used when the distribution of the liquid crystal in the liquid crystal display has a large lateral change.

Simplified triangular ground plane cloak by oblique multilayer dielectrics

Based on the effective medium theory, the triangular ground plane cloak can be realized by thin layered systems. Two solutions of parameter setting of the layered cloak are suggested to demonstrate the invisibility performance of a hybrid incoming wave. The hybrid parameters are derived from the equivalent of both anisotropies of permittivity and permeability to the Mternating layers. The performance of the designed layered cloak is validated by both TM and TE wave simulations with near-field distributions and average scattering power outflows on an observation semicircle. From the simulation results, the layered cloak with both hybrid parameters and improved hybrid parameters can reflect the incoming TM/TE waves in a specular direction, and the latter behaves with a better overall invisibility performance.

A Heavy Ion Focal Plane Detector for Beijing Q3D Magnetic Spectrometer

A semi-length focal plane detecting system for heavy ions has been built onthe Beijing Q3D magnetic spectrometer and tested by 12C+197Au,16O+150Sm,and 18O-156Gd reactions.The intrinsic resolutions of position and angle were 1.1 mmand 0.8°,respectively.The resolutions of energy loss ΔE,residual energy ER and totalenergy ET obtained were 3.0%,1.4% and 0.9%.respectively,after a special method ofdata processing was adopted.The achievable mass resolution is estimated to be about1.0% after necessary corrections for some signals concerned.Discussion aboul the edgeeffect of the detectors of this type is given too.

The effect of dynamical screening on helium(e,2e) fully differential cross-sections

This paper presents the fully differential cross sections （FDCS） for 102eV electron impact single ionization of helium for both the coplanar and perpendicular plane asymmetric geometries within the framework of dynamically screened three-Coulomb-wave theory. Comparisons are made with the experimental data and those of the three-Coulomb wave function model and second-order distorted-wave Born method. The angular distribution and relative heights of the present FDCS is found to be in very good agreement with the experimental data in the perpendicular plane geometry. It is shown that dynamical screening effects are significant in this geometry. Three-body coupling is expected to be weak in the coplanar geometry, although the precise absolute value of the cross section is still sensitive to the interaction details.

MODE Ⅰ AND MODE Ⅱ CRACK TIP ASYMPTOTIC FIELDS WITH STRAIN GRADIENT EFFECTS

The strain gradient effect becomes significant when the size of frac- ture process zone around a crack tip is comparable to the intrinsic material length l, typically of the order of microns. Using the new strain gradient deformation theory given by Chen and Wang, the asymptotic fields near a crack tip in an elastic-plastic material with strain gradient effects are investigated. It is established that the dom- inant strain field is irrotational. For mode Ⅰ plane stress crack tip asymptotic field, the stress asymptotic field and the couple stress asymptotic field can not exist si- multaneously. In the stress dominated asymptotic field, the angular distributions of stresses are consistent with the classical plane stress HRR field; In the couple stress dominated asymptotic field, the angular distributions of couple stresses are consistent with that obtained by Huang et al. For mode Ⅱ plane stress and plane strain crack tip asymptotic fields, only the stress-dominated asymptotic fields exist. The couple stress asymptotic field is less singular than the stress asymptotic fields. The stress asymptotic fields are the same as mode Ⅱ plane stress and plane strain HRR fields, respectively. The increase in stresses is not observed in strain gradient plasticity for mode Ⅰ and mode Ⅱ, because the present theory is based only on the rotational gradi- ent of deformation and the crack tip asymptotic fields are irrotational and dominated by the stretching gradient.

开腹子宫切除术中QLB-LSAL与双侧TAPB阻滞麻醉镇痛效果比较

目的:分析超声引导下外侧弓状韧带上腰方肌前路阻滞(QLB-LSAL)与双侧腹横肌平面阻滞(TAPB)在开腹子宫切除术(TAH)中的麻醉效果。方法:选取2022年1月-2023年1月本院择期行TAH患者95例,根据入院顺序按单双号分为48例QLB-LSAL组(超声引导下行双侧QLB-LSAL)和47例TAPB组(超声引导下行双侧TAPB),比较两组入室(T0)、切皮时(T1)、手术结束时(T2)、拔管时(T3)及离开麻醉恢复室时(T4)的心率(HR)及平均动脉压(MAP),比较术后48h舒芬太尼消耗量、补救镇痛例数及术后48h内镇痛泵按压次数,比较术后4h、8h、12h、24h静息及咳嗽时视觉疼痛模拟评分(VAS),统计两组术后不良反应和神经阻滞并发症发生情况。结果:两组MAP及HR均呈先上升后降低趋势,且QLB-LSAL组在T1和T2时低于TAPB组(P<0.05);QLB-LSAL组术后48h舒芬太尼消耗量(69.45±4.20μg)、补救镇痛(6.3%)及术后48h内镇痛泵按压(10.5±2.3次)均低于TAPB组(73.15±4.35μg、21.3%、12.2±4.4次)(均P<0.05);两组术后静息及咳嗽时VAS评分均呈降低趋势(P<0.05),两组术后4h、8h评分无差异(P>0.05),术后12h、24h静息及咳嗽时评分QLB-LSAL组低于TAPB组(均P<0.05);两组不良反应(6.3%、4.3%)无差异(P>0.05),两组均无神经阻滞情况发生。结论:相比于双侧TAPB阻滞,超声引导下QLB-LSAL阻滞在TAH中镇痛效果更佳,能有效降低镇痛药物使用剂量,减轻受术患者的疼痛应激反应。

乡村聚落平面形态的建筑节点网络图研究——从有效可视空间到一阶邻域

在乡村聚落中,建筑是以空间化方式、自组织机制聚集生长,从而在聚落内形成了错综复杂的局部空间;每个建筑都通过一定的局部空间为介质,与其他建筑建立秩序关联;求解所有这些具有空间关联的两两建筑之间的秩序关系量值,便可通过统计汇集为聚落整体的形态秩序趋向。在这个过程中,笔者在既往研究中采用了基于有效可视空间原则的建筑节点网络图来计量两两建筑之间的秩序关系量值。文章在对其分析评价的基础上,采用空间中轴线划分聚落空间,形成建筑户域,并根据户域相邻性原则和影响距离的限制,确定两两建筑之间是否具有显著的空间关联,进而绘制基于一阶邻域原则的建筑节点网络图。从有效可视空间网络图到一阶邻域网络图的方法提升,能够使研究对象聚焦于更核心的局部空间,进而使网络图更简洁、数据运算更高效。

竖脊肌平面阻滞在老年胸腔镜肺叶切除术患者中的应用效果

目的分析竖脊肌平面阻滞在老年胸腔镜肺叶切除术中的应用效果。方法选取2021年2月—2023年3月胜利油田中心医院行胸腔镜肺叶切除术的98例患者,采用随机数字表法分为对照组和研究组,每组49例。研究组给予竖脊肌平面阻滞联合无阿片类药物全身麻醉,对照组给予阿片类全身麻醉。比较两组T_(0)(麻醉诱导前)、T_(1)(气管插管时)、T_(2)(切皮时)、T_(3)(手术结束)的平均动脉压、心率,对比两组手术情况、术后疼痛、苏醒期间躁动情况及药物不良反应情况。结果两组T_(0)、T_(1)、T_(2)、T_(3)的平均动脉压比较,结果:(1)不同时间点的平均动脉压比较,差异有统计学意义(P<0.05);(2)两组平均动脉压比较,差异无统计学意义(P>0.05);(3)两组平均动脉压的变化趋势比较,差异无统计学意义(P>0.05)。两组T_(0)、T_(1)、T_(2)、T_(3)时刻心率比较,结果:(1)不同时间点的心率比较,差异有统计学意义(P<0.05);(2)两组心率比较,差异无统计学意义(P>0.05);(3)两组心率的变化趋势比较,差异无统计学意义(P>0.05)。两组手术时间比较,差异无统计学意义(P>0.05)。研究组术后苏醒时间、拔管时间短于对照组(P<0.05)。两组术后4、12、24和48 h的疼痛视觉模拟评分(VAS)比较,结果:(1)不同时间点的VAS评分比较,差异有统计学意义(P<0.05);(2)两组VAS评分比较,差异有统计学意义(P<0.05),研究组低于对照组,相对镇痛效果较好;(3)两组VAS评分的变化趋势比较,差异有统计学意义(P<0.05)。研究组苏醒期躁动发生率低于对照组(P<0.05)。研究组不良反应总发生率低于对照组(P<0.05)。结论竖脊肌平面阻滞用于老年胸腔镜肺叶切除术安全可行,可避免使用阿片类药物,并可减轻术后疼痛,降低苏醒期躁动发生风险,减少围手术期不良反应,有利于患者快速康复。

黔西南赖子山背斜区成矿结构面特征及其对卡林型金矿控矿作用

赖子山背斜位于黔西南卡林型金矿矿集区中部,成矿条件优越。通过对赖子山背斜区内成矿结构面特征的归纳总结,对区内卡林型金矿的控矿作用进行剖析。结果表明:研究区主要发育原生成矿结构面和次生成矿结构面,成矿结构面对金矿的控制作用表现在对金矿体产出、规模、形态、厚度和品位的控制,并指出赖子山背斜区卡林型金矿成矿主要受次生成矿结构面控制。

Analysis of the role of diffraction in topographic site effects using boundary element techniques

The role played by the diffraction field on the problem of seismic site effects is studied. For that purpose we solve and analyze simple scattering problems under P and SV in-plane wave assumptions, using two well known direct boundary-element-based numerical methods. After establishing the difference between scattered and diffracted motions, and introducing the concept of artificious and physically based incoming fields, we obtain the amplitude of the Fourier spectra for the diffracted part of the response： this is achieved after establishing the connection between the spatial distribution of the transfer function over the studied simple topographies and the diffracted field. From the numerical simulations it is observed that this diffracted part of the response is responsible for the amplification of the surface ground motions due to the geometric effect. Furthermore, it is also found that the diffraction field sets in a fingerprint of the topographic effect in the total ground motions. These conclusions are further supported by observations in the time-domain in terms of snapshots of the propagation patterns over the complete computational model. In this sense the geometric singularities are clearly identified as sources of diffraction and for the considered range of dimensionless frequencies it is evident that larger amplifications are obtained for the geometries containing a larger number of diffraction sources thus resulting in a stronger topographic effect. The need for closed-form solutions of canonical problems to construct a robust analysis method based on the diffraction field is identified.

Effect of Environmental Conditions on Flexural Strength and Fracture Toughness of Particulate Filled Glass-Epoxy Hybrid Composites

Multifunctional hybrid polymer composites were projected as novel solutions to meet the demands in various industrial applications ranging from automotive to aerospace. This investigation focuses on processing, flexural strength and fracture toughness characterization of the glass fabric reinforced epoxy (G-E) composites and graphite/fly ash cenosphere (FAC) modified interface between the epoxy matrix and glass fabric. Hand lay-up followed by compression moulding method was used to fabricate the laminates. Flexural and fracture toughness tests at room temperature, elevated temperature and cryogenic temperature were conducted to assess the flexural strength (FS) and mode-I plane-strain fracture toughness (KIC). The experimental and characterization efforts suggest that both graphite and FAC fillers improve bonding at the interface. The study showed that the graphite is more favorable for enhancing FS and KIC of G-E composites. Graphite filled G-E hybrid composites with significant FS and KIC to that of unfilled and FA filled G-E were successfully achieved by incorporating 10 wt% graphite. The incorporation of fillers resulted in improvement of FS, which increased by 43% and 37.7% for 10Gr+G-E and 10FAC+G-E hybrid composites respectively. All composites show a 26% improvement in KIC at cryogenic temperature and a decrease of 12.5% at elevated temperature. According to the SEM observations, fiber debonding from the matrix is suppressed due to the presence and uniform distribution of graphite. In addition, micro-pores, matrix shearing, active toughening mechanisms induced by graphite, such as crack deflection, layer breakage and delamination of graphite layers contributed to the enhanced KIC of hybrid G-E composites.