Characteristics and utility of combined duplex color-coded ultrasonography in the cervical rotational position with head MRI and MRA in the differential diagnosis of apogeotropic direction-changing positional nystagmus

Objective:To determine whether cervical ultrasonography,magnetic resonance imaging(MRI),and magnetic resonance angiography(MRA)are useful in the differential diagnosis of etiology and understanding the pathophysiology in cases of apogeotropic direction-changing positional nystagmus(DCPN).Methods:Thirty patients with apogeotropic DCPN were classified into 11 cases of central disease,seven cases of mixed central and peripheral disease,and 12 cases of peripheral disease by differential diagnosis based on various balance function,neuro-otological,and imaging tests.Cervical ultrasonography using the cervical rotation method and MRI and MRA of the head and neck were performed in most patients with apogeotropic DCPN.We reviewed the presence of abnormal imaging findings according to the disease etiology.Results:Of the 30 patients with apogeotropic DCPN,23 showed vascular abnormalities or central lesions on imaging.Vascular lesions were found in six of the 12 patients with peripheral disease.Cervical ultrasonography with cervical rotation detected blood flow disturbance in the vertebral artery in eight patients in whom the disturbance could not be detected by MRI or MRA of the head and neck.Discussion:We hypothesize that the causative disease of apogeotropic DCPN may be strongly associated with circulatory insufficiency of the vertebrobasilar and carotid arteries,and that impaired blood flow in these vessels may affect peripheral vestibular and central function.In patients with apogeotropic DCPN,examinations of vestibular function,central nervous system symptoms,and brain hemodynamics are valuable for differential diagnosis.

Existence of Monotone Positive Solution for a Fourth-Order Three-Point BVP with Sign-Changing Green’s Function

This paper is concerned with the following fourth-order three-point boundary value problem , where , we discuss the existence of positive solutions to the above problem by applying to the fixed point theory in cones and iterative technique.

Monitoring of Coastal Subsidence Changes Based on GNSS Positioning and GNSS-IR

Coastal subsidence monitoring typically employs Global Navigation Satellite System(GNSS)positioning technology.This method provides information only about subsidence below the station base.Sediments in coastal areas tend to accumulate quickly,and subsidence can change significantly due to compaction and alluvium.Therefore,monitoring subsidence above the base is essential to obtain overall coastal subsidence.A new technology called GNSS-Interferometric Reflectometry(GNSS-IR)has been recently developed,which can utilize multipath effects to monitor reflector height.Since the base of the GNSS station is deep and the base length remains constant,the height changes measured by the GNSS-IR technology can reflect subsidence above the base.Accordingly,this paper employs GNSS-IR technology to measure subsidence changes above the base.Additionally,GNSS positioning technology is used to obtain subsidence changes below the base,and the overall subsidence change is then calculated using both GNSS-IR and GNSS positioning technology.The Mississippi River Delta,known for its significant sediment thickness,was selected as the study area,and data from FSHS,GRIS,and MSIN stations was analyzed.The results demonstrate that GNSS-IR can be used to measure the subsidence rate above the base,and the corrected overall subsidence rate is equivalent to the relative sea level rise rate.

Damage Position of Concrete Beam Based on Test of Even Change Point

The quantitative analysis of damage position of concrete beam is established.The method of damage position free of models used in this paper is based on the variations of strain mode and test of even change point.The discrete model and the position criterion are presented.Numerical example is conducted,the result demonstrates that the method of damage position is correct and effective.

Coping with the Impact of Climate Change: A Dive into Precision Agriculture in the United States

With the continued increase in the number of people that are food insecure globally, which could be increasing because of the ongoing Ukraine-Russia war, leading to reduction in international agribusinesses, coupled with drastic climate change exacerbating the problem of food insecurity, there is a constant need to come up with innovative approaches to solve this global issue. In this article, we articulated how precision agriculture can be a tool for ensuring food security in the United States. This study aims to reiterate the significance of precision agriculture in solving global food insecurity.

Changes in Barents Sea Ice Edge Positions in the Last 442 Years. Part 2: Sun, Moon and Planets

This is the second paper in a series of two, which analyze the position of the Barents Sea ice-edge (BIE) based on a 442-year long dataset to understand its time variations. The data have been collected from ship-logs, polar expeditions, and hunters in addition to airplanes and satellites in recent times. Our main result is that the BIE position alternates between a southern and a northern position followed by Gulf Stream Beats (GSBs) at the occurrence of deep solar minima. We decompose the low frequency BIE position variations in cycles composed of dominant periods which are related to the Jose period of 179 years, indicating planetary forcings. We propose that the mechanism transferring planetary signals into changes in BIE position is the solar wind (SW), which provides magnetic shielding of the Earth in addition to geomagnetic disturbances. Increase in the solar wind produces pressure which decelerates the Earth’s rotation. It also transfers electrical energy to the ring current in the earth’s magnetosphere. This current magnetizes the earth’s solid core and makes it rotate faster. To conserve angular momentum the earth’s outer fluid mantle rotates slower with a delay of about 100 years. In addition will geomagnetic storms, initiated by solar coronal mass ejections (CMEs) penetrate deep in the Earth’s atmosphere and change pressure pattern in the Arctic. This effect is larger during solar minima since the magnetic shielding then is reduced. The Arctic may then experience local warming. The transition of solar activities to a possibly deep and long minimum in the present century may indicate Arctic cooling and the BIE moving south this century. For the North Atlantic region, effects of the BIE expanding southward will have noticeable consequences for the ocean bio-production from about 2040.

THE POSITIVE SOLUTION OF CLASSICAL GELFAND MODEL WITH COEFFICIENT THAT CHANGE SIGN

The existence and iteration of positive solution for classical Gelfand models are considered, where the coefficient of nonlinear term is allowed to change sign in [0, 1]. By using the monotone iterative technique, an existence theorem of positive solution is obtained, corresponding iterative process and convergence rate are given. This iterative process starts off with zero function, hence the process is simple, feasible and effective.

Investigating Translators＇ Positioning via the Appraisal Theory： A Case Study of the Q＆A Part of a Speech Delivered by the U.S. Vice President Cheney

Appraisal Theory is a part of the interpersonal metafunction in Systemic Functional Linguistics to reveal the speaker＇s attitudes and positionings. Some scholars in recent years have introduced this theory to the Chinese reader and applied it to the study of different genres, but up to now, very little has been done to test this newly developed theory in translation studies. This paper attempts to use the Appraisal Theory as a tool to investigate speaker＇s positioning in ST （source text） and TT （target text）. The translations of part of the Q＆A （Question＆Answer） section of the Vice President Cheney＇s speech at Fudan University and their STs will be investigated in the present study. The source and target texts are first described in the appraisal theoretical framework and then compared to find out the differences in terms of the speaker＇s positioning in ST and TT. Finally, a discussion is carried out to explore possible reasons that caused the speaker＇s changed positioning from ST and TT. Our findings indicate that translator＇s role, linguistic characteristics, and translation purpose might all contribute to speaker＇s changed positioning.

Coexistence of positive and negative magnetic entropy changes in CeMn_2(Si_(1-x)Ge_x)_2 compounds

A series of CeMn2（Si1-xGex）2（x = 0.2, 0.4, 0.6, 0.8） compounds are prepared by the arc-melting method. All the samples primarily crystallize in the Th Cr2Si2-type structure. The temperature dependences of zero-field-cooled（ZFC） and FC magnetization measurements show a transition from antiferromagnetic（AFM） state to ferromagnetic（FM） state at room temperature with the increase of the Ge concentration. For x = 0.4, the sample exhibits two kinds of phase transitions with increasing temperature： from AFM to FM and from FM to paramagnetic（PM） at around TN-197 K and T C-300 K,respectively. The corresponding Arrott curves indicate that the AFM–FM transition is of first-order character and the FM–PM transition is of second-order character. Meanwhile, the coexistence of positive and negative magnetic entropy changes can be observed, which are corresponding to the AFM–FM and FM–PM transitions, respectively.

Closed circle DNA algorithm of change positive-weighted Hamilton circuit problem

Chain length of closed circle DNA is equal. The same closed circle DNA＇s position corresponds to different recognition sequence, and the same recognition sequence corresponds to different foreign DNA segment, so closed circle DNA computing model is generalized. For change positive-weighted Hamilton circuit problem, closed circle DNA algorithm is put forward. First, three groups of DNA encoding are encoded for all arcs, and deck groups are designed for all vertices. All possible solutions are composed. Then, the feasible solutions are filtered out by using group detect experiment, and the optimization solutions are obtained by using group insert experiment and electrophoresis experiment. Finally, all optimization solutions are found by using detect experiment. Complexity of algorithm is concluded and validity of DNA algorithm is explained by an example. Three dominances of the closed circle DNA algorithm are analyzed, and characteristics and dominances of group delete experiment are discussed.

Dependence of epoch-wise two-way nested ANOVA estimates of variances of unmodeled effects present in relative GPS positioning on satellite elevation cutoff angle and PDOP mask

Impact of satellite elevation cutoff angle and position dilution of precision(PDOP)mask change on epoch-wise variance components of unmodeled effects that accompany relative Global Positioning System(GPS)positioning is presented herein.Data used for this study refer to the winter and summer periods of the years with minimal(2008)and maximal(2013)solar activity.These data were collected every 30 s in static mode,at two permanent GPS stations located in Montenegro,establishing a mediumdistance(116-km-long)baseline with a height difference of approximately 760 m between its endpoints.The study showed that changing satellite elevation cutoff angle,with a fixed PDOP mask,affects epochwise two-way nested ANOVA estimates of variances related to the‘far-field’multipath(considered as the nested factor herein)and the combined unmodeled effect of tropospheric and ionospheric refraction(considered as the nesting factor herein).However,changing of PDOP mask,with a fixed satellite elevation cutoff angle,doesn’t affect epoch-wise two-way nested ANOVA estimate of variance of the combined unmodeled effect of tropospheric and ionospheric refraction,but,generally,affects the estimate of variance of the‘far-field’multipath(possibly mixed with a part of a‘shorter-term’ionospheric refraction),which is especially pronounced for the summer period.It should also be noted that there is a significant influence of satellite elevation cutoff angle change on both epoch-wise horizontal and vertical position accuracy,only for the summer period,especially in the presence of maximal solar activity,while there is no significant impact of PDOP mask change on epoch-wise positional accuracy.

企业战略变化、垄断地位与投资效率——基于企业生命周期的视角

以2002-2021年沪深A股上市公司数据为研究样本,实证分析企业在不同生命周期阶段下的战略变化与投资效率之间的关系。研究发现:成长期企业采取积极的战略变化有助于提高其投资效率;成熟期企业的战略变化与投资效率之间存在倒“U”形关系;衰退期企业的战略变化对投资效率的影响并不显著,但在进一步研究中发现,进攻型战略变化有助于企业扭亏为盈;企业的垄断地位会弱化战略变化与投资效率之间的关系;相较于非国有控股企业,国有控股企业的战略变化对投资效率的影响更为显著。成长期企业应积极主动地调整战略以适应市场需求的变化;成熟期企业应避免过度的战略变化,以免损害已经积累的核心竞争力;衰退期企业要勇于尝试新的战略方向,重新进行品牌定位;企业在制定战略时要充分考虑企业垄断地位和企业性质等因素,以实现企业可持续发展。

新时代检察机关法律监督的逻辑体系

“四大检察”“十大业务”的新格局下,检察机关法律监督形成鲜明的逻辑体系。政治逻辑层面,新时代检察权在全面依法治国、国家治理现代化的整体布局中承载着特定的价值,这些价值统合于检察机关和法律监督的政治性中。治理型司法所具有的“协同”“能动”等特征,以及均衡型司法围绕“权利”产生的权力制约的要求,都在不断形塑着新时代检察机关法律监督的政治逻辑。法理逻辑层面,以法律监督为面向的检察权一元论成为检察与监督的逻辑基点,进而也分化出检察权在国家治理中的逻辑关系。历史逻辑层面,公权力发展中监督性权力的强化,刑事诉讼制度中检察官权力的增长,以及检察职能中诉讼的发展诉讼之外法律监督的不断拓展,都共同作用于新时代检察机关法律监督的结构变迁。形式逻辑层面,“四大检察”外部的执法司法权之间的制约监督,自身的法律监督基本功能的实现,以及内部检察权运行的有机融合,都表明了检察机关法律监督在职能统合上所作的努力。

澄清对多普勒效应的几点误解

详细讨论了波源和观察者在垂直二者连线方向上运动时是否会产生多普勒效应,波源和观察者之间的相对位置是否会影响多普勒效应,火车经过观察者时汽笛的音调是否是先越来越高后越来越低等三个容易对多普勒效应产生误解的地方,并给予澄清.特别地,推导出了波源和观察者沿任意方向运动时的精确的多普勒效应公式,证明了多普勒效应与波源和观察者之间的相对位置无关.

布鲁氏菌A19-△VirB12疫苗接种犊牛的免疫抗体变化

为了解不同剂量的布鲁氏菌A19-△VirB12疫苗采用不同接种方式免疫犊牛的抗体变化,使用不同剂量的布鲁氏菌A19-△VirB12疫苗采用点眼和皮下接种两种方式免疫3~6月龄母犊牛,用试管凝集试验(SAT)检测采集于犊牛免疫各时段的血清中抗体变化。结果表明,首次试验中在免疫24周除点眼10亿组和皮下接种50亿组外的其他免疫组均能检出SAT阳性结果。第二次试验中皮下免疫50亿组在免疫3周的SAT检测阳性率达到84.21%,在免疫25周之后的SAT检测均为阴性;两个点眼免疫组在免疫12周初次检出持续抗体阳性,至免疫52周抗体阳性率为4.54%~9.09%。可以得出,布鲁氏菌A19-△VirB12疫苗大剂量免疫犊牛后可能会干扰后期布病检疫结果的判定,A19-△VirB12疫苗50亿CFU/mL皮下免疫犊牛后具有免疫原性较好和抗体转阴时间较早的优势。点眼免疫组检出抗体时间晚,现缺乏针对前期该疫苗细胞免疫指标的检测方法,需要进一步研究。

中国人的积极理想情绪:近几十年来的变迁

理想情绪是人们理想中想体验的情绪,和文化密切相关。在当今社会快速变迁的背景下,已有大量研究探讨了人们日常体验的实际情绪的变迁,但是尚未有研究关注理想情绪的变迁。本研究第一次在中国对积极理想情绪的变迁进行研究。研究1让1966年之前出生的被试根据自己的判断,评估1980年代初、2000年代初和2020年前后中国人理想中想体验的积极情绪。结果发现,从1980年代初到2020年前后中国人对高唤醒积极情绪、低唤醒积极情绪、一般积极情绪的偏好都在上升。研究2让大学生被试根据自己的判断,评估祖辈、子辈和孙辈理想中想体验的积极情绪。结果表明,大学生知觉到的祖辈、子辈和孙辈这三代人对高唤醒积极情绪、低唤醒积极情绪、一般积极情绪的偏好也都在上升。研究3利用全国性大学生调查数据,通过横断对比分析发现,来自城市的大学生比来自农村的大学生更偏好高唤醒积极情绪、低唤醒积极情绪、一般积极情绪。总起来,3个研究一致启示,近几十年来,中国人对高唤醒积极情绪、低唤醒积极情绪和一般积极情绪的偏好都在上升。这些发现不仅拓展了对社会变迁的心理影响的认识,更加深了对理想情绪本身特性的认识。

中国数据交易所政策变迁、功能定位与规范配置

2022年12月国务院发布的“数据二十条”明确提出“统筹构建规范高效的数据交易场所”,以优化数据要素市场体系。目前,虽然关于我国数据交易的文献成果逐渐充实,但针对数据交易所及其规范配置的研究却付之阙如。通过梳理2014—2022年涉及数据交易所的规范性文件,从宏观背景、主体结构及利益需求视角,揭示我国政策变迁演进逻辑。进而,通过比较数据交易所与证券交易所、数据交易平台及数据经纪商,阐明数据交易及交易场所的独特属性,明确其制度规范所需保障的基础功能。基于政策逻辑与属性定位,我国数据交易所的规范配置应形成以数据交易机制为核心,以外部公共监督机制与内部公司治理机制为辅助的综合型规范体系,为数据交易所平稳、有序运行提供良好的制度保障。

转变体位护理对新生儿肺炎呼吸频率及康复进程的影响

目的探讨转变体位护理对新生儿肺炎呼吸频率(RR)及康复进程产生的影响。方法选择安徽省太和县人民医院2021年1月至12月收治的89例新生儿肺炎患儿作为研究对象,采用随机数字表法将其分为常规组和干预组。常规组患儿45例,治疗期间行呼吸道常规护理;干预组患儿44例,治疗期间除行常规护理外行转变体位护理干预。观察干预5 d后患儿RR、经皮血氧饱和度(SpO_(2))变化及症状改善时间。结果整体分析发现:RR时间点比较、交互作用差异均有统计学意义(P<0.05);SpO_(2)组间比较、时间点比较、交互作用差异均有统计学意义(P<0.05)。进一步两两比较,组内比较:干预组入院第1、3、5天RR比较,入院第3、5天SpO_(2)与入院第1天比较,差异有统计学意义(P<0.05);常规组入院第3、5天RR与第1天比较,入院第5天SpO_(2)与入院第1天比较,差异有统计学意义(P<0.05)。组间比较:干预组入院第1、3、5天的RR均低于常规组,SpO_(2)均高于常规组(P<0.05)。干预后干预组体温异常、呼吸困难、气促、咳嗽、湿啰音消失时间均短于常规组,差异有统计学意义(P<0.05)。结论新生儿肺炎患儿治疗中实施转变体位护理,可有效促进患儿RR、SpO_(2)获得更好的改善,加速患儿临床症状的改善,有助于康复进程缩短。

基于正序突变量相轨迹辨识的可再生能源配电网电流保护

【目的】随着可再生能源的大量接入,中性点经小电阻接地的配电网潮流不确定性使得传统三段式电流保护的整定变得日趋复杂,其灵敏性和可靠性都有所降低。为了解决上述问题,提出了一种基于正序突变量电流相轨迹辨识的新型电流保护方法予以应对。【方法】首先,分析了故障点上游、下游的正序突变量电流大小及其分布特征;其次,利用亲和力聚类算法,根据聚类结果识别定义的主故障路径;最后,提出一种搜索方法,将搜索得到的正序突变量产生源头,即位于主故障路径上的最后一级馈线视为故障馈线。【结果】基于PSCAD的仿真研究表明,所提出的保护方法能够适应各种故障工况,不受分布式电源加入的影响,具有较高的灵敏度和可靠性。【结论】研究结果有助于提升中性点经小电阻接地的配电网运行安全性,同时提升故障排查效率。