On the Case of Equalities in Comparison Results for Elliptic Equations Related to Gauss Measure

In this paper, we deal with a Dirichlet problem for linear elliptic equations related to Gauss measure. For this problem, we study the converse of some inequalities proved by other authors, in the sense that we study the case of equalities and show that equalities are achieved only in the ＂symmetrized＂ situations. In addition, under other assumptions, we give a different form of comparison results and discuss the corresponding case of equalities.

Comparison of detection results of hypoxic-ischemic encephalopathy at different degrees in infant patients between brain electrical activity mapping, transcranial Doppler sonography and computer tomography examinations

BACKGROUND： It has been proved that brain electrical activity mapping （BEAM） and transcranial Doppler （TCD） detection can reflect the function of brain cell and its diseased degree of infant patients with moderate to severe hypoxic-ischemic encephalopathy （HIE）. OBJECTIVE： To observe the abnormal results of HIE at different degrees detected with BEAM and TCD in infant patients, and compare the detection results at the same time point between BEAM, TCD and computer tomography （CT） examinations. DESIGN ： Contrast observation SETTING： Departments of Neuro-electrophysiology and Pediatrics, Second Affiliated Hospital of Qiqihar Medical College. PARTICIPANTS： Totally 416 infant patients with HIE who received treatment in the Department of Newborn Infants, Second Affiliated Hospital of Qiqihar Medical College during January 2001 and December 2005. The infant patients, 278 male and 138 female, were at embryonic 37 to 42 weeks and weighing 2.0 to 4.1 kg, and they were diagnosed with CT and met the diagnostic criteria of HIE of newborn infants compiled by Department of Neonatology, Pediatric Academy, Chinese Medical Association. According to diagnostic criteria, 130 patients were mild abnormal, 196 moderate abnormal and 90 severe abnormal. The relatives of all the infant patients were informed of the experiment. METHOOS： BEAM and TCD examinations were performed in the involved 416 infant patients with HIE at different degrees with DYD2000 16-channel BEAM instrument and EME-2000 ultrasonograph before preliminary diagnosis treatment （within 1 month after birth） and 1,3,6,12 and 24 months after birth, and detected results were compared between BEAM, TCD and CT examinations. MAIN OUTCOME MEASURES： Comparison of detection results of HIE at different time points in infant patients between BEAM. TCD and CT examinations. RESULTS： All the 416 infant patients with HIE participated in the result analysis. （1） Comparison of the detected results in infant patients with mild HIE at different time points after birth between BEAM, TCD and CT examinations： BEAM examination showed that the recovery was delayed, and the abnormal rate of BEAM examination was significantly higher than that of CT examination 1 and 3 months after birth [55.4%（72/130）vs. 17.0% （22/130 ）,x^2=41.66 ;29.2% （ 38/130 ） vs. 6.2% （ 8/130 ）, x^2=23.77, P 〈 0.01 ], exceptional patients had mild abnormality and reached the normal level in about 6 months. TCD examination showed that the disease condition significantly improved and infant patients with HIE basically recovered 1 or 2 months after birth, while CT examination showed that infant patients recovered 3 or 4 months after birth. （2） Comparison of detection results of infant patients with moderate HIE at different time points between BEAM, TCD and CT examinations： The abnormal rate of BEAM examination was significantly higher than that of CT examination 1,3,6 and 12 months after birth [90.8% （178/196）,78.6% （154/196）,x^2=4.32,P 〈 0.05;64.3% （126/196）,43.9% （86/196） ,x^2=16.44 ;44.9% （88/196） ,22.4% （44/196）,x^2=22.11 ;21.4% （42/196）, 10.2% （20/196）,x^2=9.27, P 〈 0.01]. BEAM examination showed that there was still one patient who did not completely recovered in the 24^th month due to the relatives of infant patients did not combine the treatment,. TCD examination showed that the abnormal rate was 23.1%（30/196）in the 1^st month after birth, and all the patients recovered to the normal in the 3^rd month after birth, while CT examination showed that mild abnormality still existed in the 24^th month after birth （1.0% ,2/196）. （3） Comparison of detection results of infant patients with severe HIE at different time points between BEAM, TCD and CT examinations： The abnormal rate of BEAM examination was significantly higher than that of CT examination in the 1^st, 3^rd, 6^th and 12^th months after birth[86.7% （78/90）,44.4% （40/90）,x^2=35.53;62.2% （56/90）,31.1% （28/90）,x^2=17.51 ;37.8% （34/90）,6.7% （6/90）, x^2=27.14, P 〈 0.01]. BEAM examination showed that mild abnormality still existed in 4 infant patients in the 24^th month after birth. TCD examination showed that the abnormal rate was 11.1% （10/90） in the 3^rd month after birth, and all the infant patients recovered in the 6^th month after birth. CT examination showed that the abnormal rate was 6.7%（6/90） in the 12^th month after birth, and all of infant patients recovered to the normal in the 24^th month after birth.CONCLUSION ： BEAM is the direct index to detect brain function of infant patients with HIE, and positive reaction is still very sensitive in the tracking detection of convalescent period. The positive rate of morphological reaction in CT examination is superior to that in TCD examination, and the positive rate is very high in the acute period of HIE in examination.

The Results and Comparison of "Logical-Tree" Seismic Zoning in the Panxi Area

On the basis of the technological route of seismic hazard analysis,the methods for determining seismicity parameters,such as b value,annual occurrence rate,and the seismic spatial distribution function,are discussed.Then,the seismic intensity zoning in Panxi area in Southwest China is carried out by applying the "logical-tree,"which is made up of multi-parameter schemes.It is clearly shown from the results that seismic intensity zoning is influenced by many uncertain factors and it is necessary to seek a certain balance between seismic safety and investment interest and a good way,with the present limited knowledge level,to obtain seismic intensity zoning is through the "logical-tree" method.

水平受荷桩“p-y+M-θ”分析方法

中国近海海上风电机组开发建设中,大直径单桩基础形式使用占比超70%。现行p-y曲线设计方法主要适用于小直径柔性桩,对大直径单桩侧向及桩底受荷描述能力不足,导致其严重低估刚柔性桩和刚性桩(分别常用于中国和欧洲的近海风电工程)的变形和承载能力,过于保守的设计给海上风电降本带来挑战。为此建立了能以统一的方式预测柔性、刚柔性和刚性单桩水平单调受荷响应的“p-y+M-θ”模型,并将该模型推广到循环荷载下单桩的响应分析。通过与相关试验结果比对发现,“p-y+M-θ”模型能较为准确地预测桩基水平加载响应。力图为水平受荷单桩工程设计提供简洁而可行的响应分析方法。

Z比分数不同统计方法在实验室间比对试验结果评价中的比较

Z比分数是评定实验室间比对试验结果的重要方法。系统介绍了计算Z比分数的经典统计法、四分位数稳健统计法、迭代稳健统计法(算法A)和Q/Hampel稳健统计法。并以中国石化销售企业组织的某次实验室间比对试验92号车用汽油(VIB)硫含量数据为统计对象,比较了四种统计方法Z比分数评价结果的差异性。为实验室间比对试验选择合理有效的统计分析方法,提高实验室的检测能力和管理水平提供了参考。

盾构机拖车有限元结构分析合理性研究及应用

为使有限元分析在盾构机拖车结构设计中得到合理应用,讨论了单元类型、建模方案、实际搭载设备刚度和边界条件简化等因素对有限元应用合理性的影响。通过研究得出,在方案设计阶段,为平衡计算效率和准确度,建议选用梁、壳混合单元建模计算;在同一模型中评估拖车结构接头处应力和变形时,建议对拖车使用全壳单元模型;需评估大型设备刚度对拖车结构的影响,避免出现过度设计;使用斜轮对时,需合理模拟斜轮对结构与隧道管片之间的摩擦接触关系。

电子天平实验室间比对和结果分析

本文以唐山市计量测试所为主导实验室,11个区县级法定计量检定机构作为参比实验室为例,进行电子天平实验室间比对。首先,介绍了比对的技术方案,并对其结果进行分析;然后,根据JJG 1036-2022《电子天平检定规程》,对检定工作中存在的问题进行分析,并提出建议。

老年患者动脉血气分析与静脉血相同项目的结果比对和偏差评估分析

目的 对老年患者动脉血气分析与静脉血的七个相同项目(血红蛋白、红细胞压积、钾、钠、氯、钙、葡萄糖)的结果进行对比和偏差评估分析。方法 随机选取广州市东升医院内科2022年10月—2023年1月住院老年患者110例为研究对象。于住院期间某一时间同时抽动脉血和静脉血,并及时进行动脉血气分析、血常规、生化电解质和葡萄糖浓度检测。用配对t检验和回归统计法分析实验系统和比较系统测定结果均值处的相对偏差或医学决定水平处的系统误差,以美国临床实验室修正法规(CLIA88)规定的室间质量评价允许误差范围的1/2为标准,判断不同检测系统的临床可接受性能。数据进行线性回归统计分析,明确相关系数r和回归方程。结果 血红蛋白、红细胞压积、钾、钠、氯、钙、葡萄糖的都具有显著差异,有统计学意义(P<0.05);七个项目均呈正相关,其中动脉血气的血红蛋白、红细胞压积、氯、葡萄糖高于静脉血,对应相关系数r分别为0.957、0.930、0.971、0.993,组间相比差异有统计学意义(P<0.05);其中动脉血气的钾、钠、钙低于静脉血,对应相关系数r分别为0.970、0.948、0.706,组间相比差异有统计学意义(P<0.05)。以1/2 CLIA88及CAP室间质评允许误差为判断标准,钾、钠、氯、钙、葡萄糖的偏差SE≤1/2TEa为判断标准,可被临床接受。结论动脉血气分析与静脉血清的钾、钠、氯、钙、葡萄糖偏差SE≤1/2TEa,可接受,而动脉血气血红蛋白、红细胞压积偏差SE>1/2TEa,但可通过回归方程预估,具有一定的参考价值。

普通脂质水胶敷料与凡士林纱布对感染性伤口换药的效果对比分析

比较普通脂质水胶敷料与凡士林纱布对感染性伤口换药的效果影响情况。选择北京理工大学社区卫生服务中心2021年7月—2022年7月收治的80例存在感染性伤口的患者为研究对象,在进行常规换药的过程中,依据材料使用的不同将其分为两组,每组各有40例,其中一组为实验组,给予普通脂质水胶敷料,另外一组为对照组,给予凡士林纱布,外科常规换药。随访治疗有效率、换药次数、伤口愈合时间及疼痛耐受程度。研究结果显示,实验组有效率较对照组更高,实验组患者的换药次数少于对照组,伤口愈合时间短于对照组,且实验组患者的换药疼痛感低,效果更好。研究发现,对感染性伤口患者进行换药时,应用普通脂质水胶敷料的效果显著优于凡士林纱布,普通脂质水胶敷料可有效缓解患者疼痛感,促进患者伤口愈合,减少患者换药次数,具有更加显著的临床价值。

石油地质气相色谱及气相色谱-质谱实验室比对结果评价

为了解全国石油地质行业气相色谱及气相色谱-质谱实验室间的检测能力,提高检测水平,促进行业间交流,由石油地质勘探专业标准化委员会牵头,组织全国石油地质相关实验室开展了比对工作。气相色谱及气相色谱—质谱分析测试比对共有全国23家实验室参与,选取全油、饱和烃和芳烃3类样品,根据相关标准规定了统一的实验方法,利用四分位数稳健统计方法评价了各实验室数据质量。结果表明,各实验室数据稳定、可信,分析结果的重复性和再现性良好。气相色谱全油轻烃比对参数合格率为95%,饱和烃和芳烃参数合格率均为97%;气相色谱—质谱比对饱和烃参数合格率100%,芳烃参数合格率为95%,总体满意率较高。部分实验室相关参数出现问题数据及离群值主要原因与样品储存条件、保存时间、仪器型号、测试方法以及人员操作误差等相关,建议各实验室加强质量管控措施,进一步提升实验室气相色谱及气相色谱—质谱检测能力水平。

Comparison of Ruin Probabilities in Compound Poisson Risk Model

Compound Poisson risk model has been simulated. It has started with exponential claim sizes. The simulations have checked for infinite ruin probabilities. An appropriate time window has been chosen to estimate and compare ruin probabilities. The infinite ruin probabilities of two-compound Poisson risk process have estimated and compared them with standard theoretical results.

中医医院电子病历系统应用水平分级评价现状思考

介绍我国电子病历系统应用水平分级评价发展阶段及相关研究情况,对比分析医院整体参评结果与中医医院参评结果,从评价结果、评价内容和评价过程3方面对中医医院参与电子病历应用水平分级评价相关问题进行讨论。

基于边界反射效应控制的Lamb波损伤定位算法研究

基于Lamb波开展薄板损伤定位的实验研究,通过对称相消与合理布置STMR阵列的方法,最终消除边界反射效应对损伤定位结果的影响。仿真结果表明,基于对称相消方法改进的矩形STMR阵列相比传统STMR阵列在损伤定位方面更加精确;在穿透性损伤定位方面,误差缩小了62.5%;在凹陷损伤方面误差缩小了22.8%;在距离薄板边界较近的损伤时,误差缩小了50%,消除了传统诊断技术的检测盲区,实现了对于靠近结构边界附近损伤和缺陷的准确识别检测,具有较好的工程应用前景。

水质监测中高锰酸盐指数测定手工分析法和仪器法的对比研究

高锰酸盐指数作为地表水体受有机污染物和还原性无机物质污染程度的综合指标,是水质监测中需要测定的主要参数之一。本文对比了水质监测中高锰酸盐指数测定中手工分析法和仪器法获得的结果,发现与传统手工分析法相比,仪器法具有以下明显优势:测定的空白值更低,仪器法可达0.20 mg/L,而传统手工分析法为0.33 mg/L;最低检出质量浓度更低,仪器法为0.20 mg/L,而传统手工分析法为0.30mg/L;实际样品测定的相对标准偏差更低,仪器法可达0.87%~1.10%,而传统手工分析法为1.35%~1.94%;测定样品的准确度更高,仪器法为0.87%~1.10%,而传统手工分析法为1.35%~1.94%。

基于贝叶斯优化XGBoost算法的变压器故障诊断

为提升对高能放电等小样本故障诊断的敏感度,提出基于贝叶斯优化极端梯度提升算法(BO-XGBoost)的变压器故障诊断模型。分析了贝叶斯优化XGBoost算法的基本原理和基于该算法进行变压器故障诊断的流程,选取259组故障样本,探讨了该模型的具体应用,并将其与XGBoost、支持向量机(SVM)、随机森林(RF)、K邻近法(KNN)等模型进行对比。结果表明,BO-XGBoost模型在变压器故障诊断中的精度为98.08%,比前述模型的诊断精度分别提高了5.77%、27.42%、22.58%、19.5%。

浅埋水工隧道开挖工法对比研究

以某浅埋水工隧洞为研究对象,通过FLAC3D软件建立模型,对该隧洞进行开挖工法比选的数值模拟计算,通过全断面法和三台阶法2种开挖工法的数值模拟,其结果从围岩位移、锚杆应力和喷混位移3方面进行研究,分析得出,对围岩位移而言,2种工法最大位移均位于拱顶,三台阶法最大位移为4.78 mm,全断面法最大位移为3.35 mm;在初期支护锚杆应力方面,对于2种不同开挖工法来说,三台阶法开挖使锚杆受力较大,轴向应力最大为30.2 MPa;而全断面法开挖使锚杆受力较小,轴向应力最大为20.7 MPa。在初期支护喷混位移方面,最大变形位置都为拱顶与侧壁,整体位移上全断面法小于三台阶法,三台阶法最大位移为6.50 mm,全断面法最大位移为3.84 mm。

焦度计计量比对及结果分析

2021年,铜川市计量测试所作为主导实验室,组织实施了陕西省法定计量检定机构焦度计计量比对,比对方式采用花瓣式,全省共9家计量技术机构参加。本文根据各参比实验室提交的比对结果进行总结分析,并针对比对中存在的问题提出建议与改进措施。

乌斯通沟河水文成果计算分析

乌斯通沟河流域内缺少控制性水利工程,为解决灌区灌溉及工业园区工业用水供需矛盾,缓解地下水超采等问题,拟兴建乌斯通沟水库,因此需要进行乌斯通沟河水文成果计算分析。通过对参证站阿拉沟水文站年径流频率及年内分配进行计算,采用径流深等值线法和水文比拟法计算得出乌斯通沟河径流成果;采用综合频率曲线法、洪峰模数法、推理公式法计算得到设计洪峰和洪量成果。根据成果比选,最终得到拟建水库设计坝址处径流与洪水成果。

酸度计量值比对实例

酸度计测量范围广,是应用于环境保护、食品检测、医疗卫生、地质探勘等领域的重要测量设备,尤其在水质检测中尤其重要。为了加强建标单位监管力度,保障量值准确一致,本文开展酸度计量值比对。