BEST PROXIMITY POINT THEOREMS FOR SINGLE- AND SET-VALUED NON-SELF MAPPINGS

We study the existence of best proximity points for single-valued non-self map-pings. Also, we prove a best proximity point theorem for set-valued non-self mappings in metric spaces with an appropriate geometric property. Examples are given to support the usability of our results.

A new calibration model for pointing a radio telescope that considers nonlinear errors in the azimuth axis

A new calibration model of a radio telescope that includes pointing error is presented, which considers nonlinear errors in the azimuth axis. For a large radio telescope, in particular for a telescope with a turntable, it is difficult to correct pointing errors using a traditional linear calibration model, because errors produced by the wheel-on-rail or center bearing structures are generally nonlinear. Fourier expansion is made for the oblique error and parameters describing the inclination direction along the azimuth axis based on the linear calibration model, and a new calibration model for pointing is derived. The new pointing model is applied to the 40 m radio telescope administered by Yunnan Observatories, which is a telescope that uses a turntable. The results show that this model can significantly reduce the residual systematic errors due to nonlinearity in the azimuth axis compared with the linear model.

FIXED POINT THEOREMS AND BEST APPROXIMATION IN CONVEX METRIC SPACES

Results regarding best approximation and best Simultaneous approximation on convex metric spaces are Obtained.Existence of fixed points for an ultimately nonexpansive semigroup of mappings is also shown.

BEST APPROXIMATION THEOREM FOR SET-VALUED MAPPINGSWITHOUT CONVEX VELUES AND CONTINUITY

In this paper, a new concept of weakly ,convex graph for set-valued mappings is introduced and studied. By using the concept , some new coincidence, the bestapproximation and fixed point-theorems are obtained.

COMMON FIXED POINTS WITH APPLICATIONS TO BEST SIMULTANEOUS APPROXIMATIONS

For a subset K of a metric space （X,d） and x ∈ X,Px（x）={y ∈ K ： d（x,y） = d（x,K）≡ inf{d（x,k） ： k ∈ K}}is called the set of best K-approximant to x. An element go E K is said to be a best simulta- neous approximation of the pair y1,y2 E ∈ if max{d（y1,go）,d（y2,go）}=inf g∈K max {d（y1,g）,d（y2,g）}.In this paper, some results on the existence of common fixed points for Banach operator pairs in the framework of convex metric spaces have been proved. For self mappings T and S on K, results are proved on both T- and S- invariant points for a set of best simultaneous approximation. Some results on best K-approximant are also deduced. The results proved generalize and extend some results of I. Beg and M. Abbas^[1], S. Chandok and T.D. Narang^[2], T.D. Narang and S. Chandok^[11], S.A. Sahab, M.S. Khan and S. Sessa^[14], P. Vijayaraju^[20] and P. Vijayaraju and M. Marudai^[21].

Simulation Model of Mechanical Properties of Point - Bonded Nonwovens

A computer model for studying the mechanical properties of point - bonded nonwovens is established. The simulation tensile curve of a nonwoven fabric may be obtained based on relaxation procedure when the mechanical properties of fibers, the arrangement of bond points in the fibrous web and specimen size are inputted into the computer. Relaxation method and relevant algorithms of computer simulation are described in detail. The validity of the model is also demonstrated.

GRAPHICAL COMPUTING METHOD ON FOUR-BAR LINKAGE(1)——Inflexion Circle,Focal Axis,Ball's Point,Centering-point Curve and Circling-point Curve For Four ISPs,Coupler Curves Based on Ball's Points——

By means of programs GTMPAC based- on generalized triangle method,analysis and synthesis of mechanism design in accordance with absolutely graphicalmethod( absolutely germetrical method) are developed.In this paper,we make aspecial study about centering- point curve and circling- point curve and couplercurves based on Ball’s points.

Coupled Fixed Point for (<i>&alpha;</i>, <i>&Psi;</i>)-Contractive in Partially Ordered Metric Spaces Using Compatible Mappings

In this paper, first we introduce notions of (α, Ψ)-contractive and (α)-admissible for a pair of map and prove a coupled coincidence point theorem for compatible mappings using these notions. Our work extends and generalizes the results of Mursaleen et al. [1]. At the end, we will provide an example in support of our result.

AN APPLICATION OF A FIXED POINT THEOREM TO BEST SIMULTANEOUS APPROXIMATION

Using a recent result regarding the fixed points of multivalued mappings, the existence of invariant best simultaneous approximation in chainable metric space is proved.

Epidemio-Clinical, Therapeutic and Evolutive Aspects of Pulmonary Embolism in Young Subject in the Cardiology Department in Point “G” Hospital University Center Bamako

Objective: The purpose of this work was to determine the epidemiological, clinical and evolutionary aspects of the pulmonary embolism of the young person in the cardiology department of the University Hospital Center (CHU) Point G in Bamako-Mali. Methodology: This was an analytical study from January 01, 2018 to December 31, 2018 in the CHU Point G cardiology department, including all patients hospitalized during this period. Results: Of 1379 hospitalized patients, 19 patients were concerned by pulmonary embolism of the young person. The prevalence of pulmonary embolism of the young person was 1.37%. The most affected age group was 21 - 30 (47.4%) of patients. The predominance was female (89.47%) with a gender ratio of 0.11 in favour of women. The average age in the series was 29.79 years with extremes of 16 years and 40 years. Factors predisposing to pulmonary embolism were dominated by peri partum, cardiomyopathy and obesity with 47.3%, 31.57% and 21.1%, respectively. The dominant signs were chest pain and dyspnea in 94.7% and 89.5% of cases respectively. Pulmonary embolism was unlikely in 60.52% according to the Geneva and Wells score simplified. At the thoracic angioscanner, the embolism was bilateral in 52.6% of cases and distal in 36.8% of patients;in 10 patients who performed cardiac ultrasound, pulmonary arterial hypertension (70%), dilation of the right ventricle (20%) and left ventricular dilation (40%). Hyper leucocytosis (47.4%), anemia and low prothrombin rate (TP) (22.2%) were the most found biological abnormalities. More than 2/3 (68.5%) our patients had an intermediate mortality risk according to the PESI (Pulmonary Embolism Severity Index) score. The average hospital stay was 10 days. Hospital mortality was 10.5%. Conclusion: The pulmonary embolism of the young person is a frequent, serious and multifactorial pathology and the female sex is most affected especially during peri partum periods, hence the need for preventive measures. Clinical signs are not specific and based on the assessment of clinical probability. Pulmonary angioscanner remains the confirmation review in our context.

Cross-Correlation Detection of Point Sources in the WMAP First Year Data

We apply a Cross-Correlation （CC） method developed previously for detecting gamma-ray point sources to the WMAP first year data by using the Point-Spread Function of WMAP and obtain a full sky CC coefficient map. We find that the CC method is a powerful tool to examine the WMAP foreground residuals which can be further cleaned accord- ingly. Evident foreground signals are found in the WMAP foreground cleaned maps and the Tegmark cleaned map. In this process 101 point sources are detected, and 26 of them are new sources additional to the originally listed WMAP 208 sources. We estimate the flux of these new sources and verify them by another method. As a result, a revised mask file based on the WMAP first year data is produced by including these new sources.

CAS 132-2006 Standard for Flat Panel Display TV Set Installation Service Formulating and Enforcing Main Point Explanation and Analysis

CAS 132-2006 formulation background and work courses Flat panel display technology is maturing alongside the development of science and technology. The prices of flat panel display TV sets are becoming lower and lower. Flat panel display TV sets have begun entering the mainstream and are now the first choice of some consumers when making new TV purchases.Display TV Set Installation Service Point Explanation and AnalysisRepair, Retreat and Change Duty Stipulations. Peculiar use conditions, usage environments, and the practical circumstances of user consumption service requirements, etc., were also taken into account on the basis of extensive investigation, testing, and verification.……

偏序集上非自映射的最佳逼近点定理

给出广义收缩非自映射的概念,证明了该非自映射在偏序集上的最佳逼近点定理,并举例支持本文的研究结果.所得结果推广了相关文献的结论,尤其无偏序关系的距离空间中非自映射的最佳逼近点定理是本文结论的一个特殊情况.

多级串并联离心泵运行特性研究

为了研究泵系统串并联的工作特性,设计了一种由3台泵组成的双进口、双出口的串并联组合形式,通过试验和数值模拟结合的手段对每台泵能量特性进行分析。结果表明,通过对工作模式3不同流量下各泵的流量进行监测,发现并联的一级泵之间流量分布规律并不相同,最大流量差为0.15 Q_(d),两者之间流量差值随流量的不断增大呈现先增大后减小的规律;出口1的扬程与M2的扬程较为接近,最大差值为0.188 H_(d),与M1的扬程差值较大,最大差值为1.139 H_(d);出口2的扬程基本不随工况发生变化,但是受上游2台并联一级泵的混合流态影响会产生波动。研究结果可为离心泵复杂串并联系统的设计和改进提供参考。

应用混合线性模型对白桦家系速生性及稳定性分析与选择

为了选出白桦半同胞家系中速生且稳定的优异家系用于种子园改建,以永吉、尚志和庆安试验点的8年生白桦半同胞家系试验林为研究对象,调查其生长性状和适应性。采用误差异质混合线性模型,对各性状进行了多地点固定效应和随机效应分析,通过最佳线性无偏预测(BLUP)法估算各家系的材积育种值,并结合基因型主效应与基因型-环境互作效应(GGE)双标图,联合分析各家系的速生性和稳定性。结果表明:(1)白桦半同胞家系胸径、单株材积和保存率等性状的地点效应显著(P<0.01);除保存率外,各性状在家系×地点的互作效应均达到显著水平(Z值>1.5)。各试验点的方差分析结果表明,除尚志和庆安试验点保存率外,其余性状在家系间的差异均达到极显著水平(P<0.01)。尚志、永吉和庆安试验点各性状中,变异系数最大的均为单株材积,分别为40.74%、47.62%和41.67%。(2)将综合育种值从大到小排序,若按照前10%的入选率确定各试验点优良家系,则在永吉、尚志和庆安各选出了相应的7个家系,其单株材积的平均遗传增益分别为6.20%、9.44%和8.79%。(3)GGE双标图分析结果表明,3个试验点被分为3个适生区;各家系在不同试验点中的表现不同,在庆安、永吉和尚志试验点表现最好的分别为1-43、1-42和1-39家系,结合生长量及稳定性的数据排名,综合性状表现最好的是3-29、3-13、3-38、3-16、3-14、3-42和3-17等7个家系,平均单株材积遗传增益为10.41%。白桦子代生长性状受基因型、基因型与环境互作影响显著。依据BLUP数据的GGE双标图分析结果,综合3试验点的速生及稳定性,选出7个优良家系。

基于最佳线性无偏预测的精密单点定位方法

卫星导航定位中,卡尔曼滤波是快速处理海量观测数据,精确解算位置坐标的常用方法。为解决实际定位解算时需要计算部分参数的近似值作为先验信息的问题,引入最佳线性无偏预测理论对无先验信息的参数初值进行估计并使用其残差方差代替未知的先验方差参与计算。在静态和动态情形下进行了非差非组合精密单点定位实验并与传统滤波方法进行对比。算例结果表明,基于最佳线性无偏预测的精密单点定位算法可以对无先验信息的参数估计初值和方差信息,且定位精度与卡尔曼滤波一致。

考虑环境成本综合效益的泾河流域最佳管理措施评价与筛选

基于土壤和水评估工具(SWAT)评估9种单一最佳管理措施(BMPs)及其不同组合共计103种BMPs情景布设对非点源污染的消减效率,并基于信息熵的多属性决策方法评估泾河流域BMPs实施成本和非点源控制有效性之间的权衡.研究发现,SWAT模型在泾河流域非点源污染模拟中适用性较好,不同的BMPs对非点源污染负荷削减量存在较大差异,组合BMPs比单一BMPs在降低非点源污染负荷方面表现更好.在农业耕作过程中减少化肥50%的施用量、将坡度大于25°的农田退耕还草以及在河道进行植草水道措施建设是泾河流域具有最大环境成本综合效益值的优选组合BMPs.

完备H-度量空间中非紧型KKM定理的应用

在完备H 度量空间中借助于Kuratowksi测度,去掉KKM定理中紧性的条件,建立了一个非紧型的KKM定理,并将此结果应用于不动点、最佳逼近、极大极小不等式和鞍点等问题.

一种连续U-树抽象状态最佳分裂点选取方法

经典连续U-树算法使用分布检验来确定抽象状态的最佳分裂点,但选取合适的置信阈值非常困难.提出一种基于最优的最佳分裂点选取方法,该方法将抽象状态的最佳分裂点选取问题转化为一个最优问题,从而规避了置信阈值大小难以确定的问题,并从理论上减少了连续U-树算法的时间复杂度.通过消解协商僵局的学习任务实验验证了它的有效性,表明了算法的性能得到增强.