Total Electron Content during Recurrent and Quiet Geomagnetic Periods at the Koudougou Station in Burkina Faso

In this work, the comparative study of total electron content (TEC) between recurrent and quiet geomagnetic periods of solar cycle 24 at Koudougou station with geographical coordinates 12°15'N;- 2°20'E was addressed. This study aims to analyze how geomagnetic variations influence the behavior of TEC in this specific region. The geomagnetic indices Kp and Dst were used to select quiet and recurrent days. Statistical analysis was used to interpret the graphs. The results show that the mean diurnal TEC has a minimum before dawn (around 0500 UT) and reaches a maximum value around 1400 UT, progressively decreasing after sunset. In comparison, the average diurnal TEC on recurrent days is slightly higher than on quiet days, with an average difference of 7 TECU. This difference increases with the level of geomagnetic disturbance, reaching 21 TECU during a moderate storm. The study also reveals significant monthly variations, with March and October showing the highest TEC values for quiet and recurrent days, respectively. Equinox months show the highest mean values, while solstice months show the lowest. Signatures of semi-annual, winter and equatorial ionization anomalies were observed. When analyzing annual variations, it was found that the TEC variation depends significantly on F10.7 solar flux, explaining up to 98% during recurrent geomagnetic activity and 92% during quiet geomagnetic activity.

《西线无战事》:20世纪30年代前后的“抢演”“银星”与“风化”

雷马克的《西线无战事》在1930年代前后的热译是一个颇耐人寻味的跨文化事件。较之作品译介本身,本地化的戏剧、电影传播格外具有意义。话剧改编的“抢演”与对“银星”的追慕是《西线无战事》轰动一时的重要推手。戏剧、电影改编的“即视感”深化了作品主旨,“银星”也成为延伸作家及其作品的重要导引。而围绕影戏可能“有伤风化”的“非议”不仅稀释了文学作品浓重的“非战”意味,也赋予了文本更为丰富的现代意涵。在本地化权利协商中,西方文学经典与戏剧、电影改编的互动为我们展现了戏剧、电影如何建构同时解构文学经典性的复杂辩证关系。它不仅是对文学现代发生的意识形态化阐释倾向的质疑,更是对现代文学多元簇生的文化生态的正视。

禅化自然中的和风美学--论蕉门俳谐中的“闲寂”意境及其佛禅因子

日本“俳圣”松尾芭蕉的俳谐作品具有浓厚的“闲寂”色彩,俳句的意象组合与情感表达独具中世和风之美。“闲寂”意境集中体现了松尾芭蕉的创作理念与处世态度,同时作为日本民族传统审美意识的缩影,其对后世的日本文学创作产生了长远影响。这种中世审美意境的形成,与松尾芭蕉对佛教禅宗的理解密不可分。松尾芭蕉早年接触佛教,在接受中国佛教禅宗的过程中独创出了“闲寂”境界,这为蕉门俳谐的创作提供了丰富的精神养料。“闲寂”意境与佛禅因子相互融合,并在后来的蕉门俳谐论--“侘寂”中大放异彩,其中的“虚实”“风雅”与“不易·流行”理论皆蕴含着“闲寂”意境以及对俳谐禅意的哲学阐释。

基于虚拟误差传感的大尺度空间有源降噪性能研究

针对大尺度空间有源降噪系统误差传声器布放位置受限问题,本文使用虚拟误差传感在降噪目标区域放置多个虚拟误差传声器,将静音区由物理误差传声器点转移至虚拟误差传声器点,扩大降噪目标区域中静音区范围。为了对降噪性能及影响因素进行分析与研究,给出多通道虚拟误差传感的原理和算法,对降噪性能及物理与虚拟误差传声器的数量和布放等因素进行仿真分析,在飞机模型舱内进行实验验证。仿真及实验结果表明:使用虚拟误差传感有利于增大降噪目标区域降噪量及静音区;物理与虚拟误差传声器的布放影响静音区的分布;合理的物理与虚拟误差传声器数量及布放可以扩大静音区使其100%覆盖降噪目标区域,最优数量与初级声场频率特性相关。

名中医崔向宁从“和法”治疗慢性胃炎经验

“和法”作为中医学中的治疗大法,最早源于《中庸》“致中和”思想,指通过平调寒热、补泻互用等多种治疗手法,以使机体脏腑气血、阴阳、寒热达到“以平为期”的生理状态。其核心思想为“和其不和也”,对现代临床具有重要指导意义。慢性胃炎包含萎缩性和非萎缩性两种,是临床上常见的慢性消化系统疾病,其病机复杂多样,单用西药治疗较为单一。崔向宁老师在临床中对于此病的治疗颇有研究,且疗效显著,认为“诸病不已,必寻道脾胃之中”。治疗上善以“和法”理论为指导,以调和气机贯穿始终,运用平调寒热、补泻兼施、辛开苦降等多种治疗方法,并结合现代病理与药理,自拟和胃消痞方,临床应用效如桴鼓。现就崔向宁老师对于此病的治疗心得和用药特点进行总结与探讨,以期为今后临床辨证治疗此病提供经验总结与理论参考。

高压气瓶充气过程和静置过程的动态特性分析

高压气瓶的充气过程和静置过程的动态特性是相关系统安全运行的重要基础。针对高压气瓶的充气过程和静置过程建立了考虑气瓶热容、气瓶散热的理论模型,并通过试验验证了模型的准确性。基于理论模型,对充气和静置过程中的气瓶压力、气瓶温度、气体温度、补气压力等参数进行了分析;讨论了不同充气速度对上述参数的影响,充气速率越大,气瓶温度越高,稳定压力越低,即需要的补气压力越高。当充气速率由0.3 MPa/min增大到2.0 MPa/min时,气瓶壁面温度由28.3℃升高到54.7℃;补气压力由1.2 MPa提高到4.5 MPa。

电动洗衣机静音洗涤程序静音限值的研究

本文依据GB/T4214.1-2017和GB/T4214.4-2008标准,通过静音洗涤程序的比对试验进行研究,并邀请十一名用户进行噪声接受度的评价,研究并确定电动洗衣机静音洗涤程序运行静音限值和电动洗衣机静音洗涤程序的静音等级。

润滑脂对More Quiet噪声测试的影响

为研究润滑脂对More Quiet噪声测试的影响,采用608微型精密轴承进行测试,对不同工作锥入度、洁净度和纤维结构的润滑脂进行分析测试,结果表明:适当增大润滑脂的工作锥入度会提高润滑脂的噪声等级,润滑脂的洁净程度越高,纤维结构越短小均匀,噪声等级越高。静音性能优异的润滑脂具有优异的机械、胶体安定性能。

Peak of Electron Density in F2-Layer Parameters Variability at Quiet Days on Solar Minimum

This study deals with Peak of electron density in F2-layer sensibility scale during quiet time on solar minimum. Peaks of electron density in F2-layer (NmF2) values at the quietest days are compared to those carried out from the two nearest days (previous and following of quietest day). The study uses International Reference Ionosphere (IRI) for ionosphere modeling. The located station is Ouagadougou, in West Africa. Solar minimum of phase 22 is considered in this study. Using three core principles of ionosphere modeling under IRI running conditions, the study enables to carry out Peak of electron density in F2-layer values during the quietest days of the characteristic months for the four different seasons. These parameters are compared to those of the previous and the following of the quietest days (the day before and following each quietest selected day) at the same hour. The knowledge of NmF2 values at the quietest days and at the two nearest days enables to calculate the relative error that can be made on this parameter. This calculation highlights insignificant relative errors. This means that NmF2 values at the two nearest days of each quietest day on solar minimum can be used for simulating the quietest days’ behavior. NmF2 values obtained by running IRI model have good correlation with those carried out by Thermosphere-Ionosphere-Electrodynamics-General Circulation Model (TIEGCM).

Simulation of the active and quiet periods of seismicity

In this paper we simulate the repeated occurrence of strong earthquakes along a strike-slip fault by using a finite element model. The fault valve mechanism is included in the model in order to take into account the effeCt of POre fluid pressure variation. Five parameters are used to characterize the rheology of the fault, POre pressure variation, and fracture criteria. By Systematically varying these parameters and calculating a large number of models we carried out a preliminary investigation on the alternatively quiet and active periods of seismicity and their relation to model Parameters and loading conditions. Under the action of a constant-rate boundary movement, in the case of intermediate stress and pore pressure, the models display a regular quiescence-activity phenomenon with a cycle length of 1/3-1 of the recurrence pened. When the model is under high stress or high pore pressure, this phenomenon becomes irregular or inexplicit. When the model is subject to periedic boundary forces and the amplitude of force variation is not too small, it results in an alternatively quiet and active seismicity Pattern with the same Period Of the force variation.

Quiet rest ameliorates biochemical metabolism in the brain in a simple concussion rabbit model Evaluation of hydrogen proton magnetic resonance spectroscopy

The present study analyzed changes in the biochemical metabolites N-acetyl aspartate, choline, and creatine in a simple concussion rabbit model following quiet rest, hyperbaric oxygen therapy, or interference stimulation through the use of hydrogen proton magnetic resonance spectroscopy detection. Experimental findings showed that brain N-acetyl aspartate and choline peak values significantly decreased, while creatine peak values significantly increased following simple concussion. Following treatments, N-acetyl aspartate and choline peaks returned to normal levels in the quiet rest and hyperbaric oxygen therapy groups, but no changes were observed in the interference stimulation group. Results demonstrated abnormal changes in the brain biochemical metabolism environment following simple concussion. Quiet rest was shown to play an important role in restoration of biochemical metabolism following simple concussion.

Aerodynamic Design of the Bleed Slot in a Hypersonic Quiet Nozzle

The bleed slot is necessary for the requirement of the hypersonic quiet flow all over the world. The aim of the bleed slot is to decrease the influence of the disturbances from the contraction of the quiet nozzle to the boundary layer downstream of the throat, so that the boundary layer of the nozzle could be maintained as laminar flow. The main parameters of the bleed slot include the distance from lip to throat (DLT) and the width of slot (WS). Various values of those parameters will affect the performance of the slot by changing the suction intensity of the bleed slot. Two kinds of the bleed slots in the world are compared in this paper and the aerodynamic design of the bleed slots is optimized based on the Purdue-type slot. The influences of the various values of those parameters to the flow field around the throat are analyzed and the optimizing results of DLT and WS are consistent with those relative data designed for the slot of the Boeing/AFOSR Ma 6 Quiet Tunnel.

Aerodynamic Optimization of the Expansion Section in a Hypersonic Quiet Nozzle Based on Favorable Pressure Effect

Maximum expansion angle is the primary parameter for the design of expansion section of hypersonic quiet nozzle. According to the quantity of maximum expansion angle, expansion section could be classified as fast expansion and slow expansion. In order to diminish the effect of instability of Görtler vortex, gradually, slow expansion was employed for quiet nozzle design. Based on the favorable pressure effect, the maximum expansion angle is optimized in this paper, and a considerable selective session of maximum expansion angle is obtained. The trend that slow expansion is employed instead of fast expansion is explained, and a new method is established for aerodynamic optimization of expansion section contour in a quiet nozzle.

Quiet Zone Design in Diffuse Fields Using Ultrasonic Transducers

This paper presents quiet zone design using ultrasonic transducers for local active control in pure tone diffuse fields. Most of researches in local active noise control used conventional loudspeakers for the secondary sources to produce quiet zones. Recently ultrasonic transducers have been used for the secondary sources to control the plane wave in active noise control. However there is no research related to active noise control in diffuse fields using ultrasonic transducers. Therefore this study uses ultrasonic transducers for the secondary sources to control the diffuse fields. The quiet zone produced using ultrasonic transducers in single tone diffuse fields has been analyzed through simulations in this work. The results showed that quiet zones created using ultrasonic transducers were larger than those created using conventional loudspeakers. This is due to the fact that the audible sound pressure produced by the ultrasonic transducers decays slowly with the distance. Therefore the secondary field created by an ultrasonic transducer could fit the primary field better and the larger zone of quiet could be obtained using the ultrasonic transducer. Also the audible sound produced by the ultrasonic transducers is directional;therefore the sound pressure amplification outside the quiet zones was lower.

Comparative Study of foF2 during Quiet Geomagnetic Activity with URSI and CCIR Predictions during the Phase Minimum of Solar Cycle 22

This paper investigates the performance of the latest International Reference Ionosphere model to predict the critical frequency at low latitudes in the African region. The variability of the critical frequency of the F2 layer of the ionosphere (foF2) is studied for the different seasons of the phase minimum of solar cycle 22 during quiet geomagnetic activity at the Ouagadougou station. The data used are those provided by the ionosonde and the predictions of the two subprograms: International Radio Consultative Committee (CCIR) and International Radio-Scientific Union (URSI) of the 2016 version of the International Reference Ionosphere model. This study shows that, in general, URSI and CCIR of the IRI-2016 model are able to reproduce fairly well the variability of the critical frequency of the F2 layer of the ionosphere at low latitudes during the phase minimum at the Ouagadougou station. However, the model shows an almost homogeneous overestimation of the foF2 during the four seasons studied. The good response is observed between 0700 TL and 1900 TL for the available data. The agreement between the subroutine responses and the observed results is between reasonable and poor. The best match state response is obtained in winter with the CCIR subroutine. These results show that there is a need to improve both CCIR and URSI subroutines of the IRI-2016 model in low latitudes in the African region.

Quiet Steel材料在洗碗机噪声控制上的应用研究

洗碗机通常采用内胆和内门粘贴阻尼片的方式来降噪,但增加阻尼片的同时会造成整机能耗的增加。Quiet Steel材料是一种新型的降噪材料,可用于制作洗碗机内门内胆等结构部件,且具有良好的降噪效果。本文就其在洗碗机噪声控制上的应用做了一些试验研究,得出使用Quiet Steel材料的部件与贴有2mm厚度阻尼的普通材料的部件可达到相同的降噪效果,并可使整机能耗有一定的降低。

基于景观格局的FAST宁静区生态风险时空演变分析

为揭示FAST工程的建成对宁静区及区内不同圈层生态环境的影响,并为区域未来的生态保护和风险防范提供一定参考,以2000、2010、2020年土地利用数据为基础,利用景观干扰度和脆弱度指数构筑评价模型来分析该区域2000~2020年景观格局及生态风险的演变特征.结果表明:林地、草地、耕地为FAST宁静区的优势景观类型,前10a景观变化以草地、耕地向林地转化为主,人类活动相对较弱;后10a建设用地快速增加,三个圈层综合动态度皆有所上升,景观变化渐活跃但仍处于较低可控水平;FAST宁静区以低、较低、中生态风险区为主,核心区、中间区生态风险低,但受FAST工程影响有上升趋势,边远区生态风险变化表现为“两极下降,中间升高”的纺锤状;FAST宁静区生态风险呈空间正相关且相关性越渐显著,分布特征以“高-高”聚集和“低-低”聚集为主.

基于陈可冀院士“动静结合”思想开拓中国特色心脏康复之路

由于人口老龄化及城镇化进程的持续加速,我国心血管疾病负担日益沉重。心脏康复以医学整体评估为基础,通过运动、心理、药物、健康教育和生活方式改变等综合干预手段,可提高病人生活质量、改善心血管预后,帮助其回归家庭和社会。我国区域经济发展极不平衡,农村偏远地区缺乏专业康复设施,现有心脏康复模式近期很难在全国大规模推广、落实。在传承中医康复理论精华、弘扬陈可冀院士“动静结合”康复思想的基础上,结合现代心脏康复医学研究进展,并基于国家中医心血管病临床医学研究中心工作经验,本团队提出“形神调和”心脏康复模式。

嗓音训练促进声带息肉患者术后嗓音恢复的效果评价

目的:探讨嗓音训练在促进声带息肉患者术后嗓音恢复中的价值。方法:将2020年5月-2022年8月在宜春市第二人民医院择期行声带息肉切除术的50例患者为研究对象。使用电脑软件按照入院顺序进行随机分组(25例/组)。观察组有男性15例,女性10例,平均年龄(37.14±4.83)岁,平均发病时间为(3.04±0.83)年;对照组有男性14例,女性11例,平均年龄(37.35±4.75)岁,平均发病时间为(3.03±0.42)年。对照组要求患者在术后要禁声休息,观察组术后接受嗓音训练。比较两组患者术后效果以及训练前后嗓音障碍指数量表(VHI)评分、嗓音嘶哑程度量表(GRBAS)评分的变化情况。结果:观察组术后4周有效率为100.00%,对照组为96.00%,差异无统计学意义(P>0.05);观察组训练后功能评分、生理评分、情感评分及VHI总评分均低于对照组,训练后G评分、R评分、B评分及GRBAS总评分也均低于对照组,差异均有统计学意义(均P<0.05);观察组术后嗓音恢复总满意度高于对照组,差异有统计学意义(96.00%比76.00%,P<0.05)。结论:嗓音训练在促进声带息肉患者术后嗓音恢复中有良好作用,可提升患者的嗓音恢复满意度。

夏热冬暖地区下沉广场对地下综合交通枢纽通风性能的影响

对夏热冬暖地区有下沉广场的地下综合交通枢纽冬夏两季空调运行工况进行了CFD模拟,得到了冬夏季典型工况各层主要截面的风速场和下沉广场设置所导致的进出风情况,并基于准静风区、换气次数等概念对其进行了分析。结果显示:夏季工况下沉广场进出风呈现“一进三出”的特点,冬季工况呈现“两进两出”的特点;由于玻璃幕墙的设置,在玻璃幕墙内形成了明显的空气流道;室外风向变化与下沉广场设置情况、开口面积、内部结构共同作用影响建筑通风性能,并且室外气流更容易通过开口方向与风向相同、开口面积较大、内部无大量隔断墙等结构的下沉广场进入室内。