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.

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.……

HIT-HY150植筋施工技术

结合具体工程实例,介绍了HIT-HY150新型混合树脂植筋工艺,并对其进行了抗拉拔试验,试验结果表明:使用该技术使粘结强度比环氧树脂产品平均提高40%,能使新旧混凝土粘结牢固,发挥设计所期望的性能,可广泛应用于各种室内外补强加固的工程结构中,社会效益显著。

基于目标机动噪声的末制导弹命中概率模型

末制导火箭弹对机动目标打击过程中,火控系统对机动目标的解算及命中概率是值得关注的问题。用射表拟合函数与目标运动方程联立建立解命中模型,并采用弦截法迭代求解。用离散的短时状态转移方程推导出长时期状态转移方程,从中分离出各短时间段内的高斯白噪声的累积和作为长期预测的概率模型。针对不同机动模型,用历史采样数据估计概率模型中白噪声的方差,从而可确定模型整体方差,并根据火箭弹飞行时间及末制导弹制导范围可计算命中概率。对CV模型、CT模型、CA模型和singer模型进行了解命中和概率计算,通过仿真验证了概率模型的准确性。

基于点云数据配准的输电线路异常检测方法

异常检测是输电线路运维中的重要环节,可为输电线路故障维修提供可靠依据。但现有检测方法命中率较低,且检测结果与实际运行线路的斯皮尔曼相关系数较低。针对现有方法的不足,提出了一种基于点云数据配准的输电线路异常检测方法。首先,利用三维激光扫描仪采集输电线路点云数据;其次,对采集点云数据中离散点进行降噪处理,并通过点云数据配准方法模拟输电线路状态;最后,通过与正常输电线路对比识别线路异常状态,以完成输电线路异常检测。实验表明,异常检测方法命中率高达96%以上,检测结果与实际运行线路的斯皮尔曼相关系数达0.9以上,同时,该方法在输电线路异常检测方面具有良好的应用前景。

考虑导引头探测角度控制的直接碰撞拦截末制导律设计

使用毫米波雷达导引头的直接碰撞拦截弹在命中前对来袭目标进行成像从而选择关键部位进行打击。在不同的探测角度下,毫米波雷达导引头对目标的成像效果有较大差异,需加以控制。针对直接碰撞拦截弹导引头探测角度的控制问题,在比例导引的基础上进行扩展,设计了探测角度控制末制导律,可实现拦截弹在命中前以期望的角度探测目标,从而保证导引头成像效果。与此同时,考虑导引头最大转角的限制,分析了制导律中探测角的设定范围,进而避免因探测角过大导致导引头丢失目标。最后以数字仿真结果验证了该方法的有效性。

一种打击大型水下航行器中间部位的垂直命中方法

受探测系统目标瞄准点在大型水下航行器上随机漂移的影响,工程应用中经常会出现高速攻击型无人水下航行器(UUV)在大型水下航行器前后两侧垂直穿过而导致目标脱靶的情况。针对上述问题,文中提出一种新的垂直命中导引方法,利用探测系统多周期数据实现垂直命中大型水下航行器中间部位的目的,并进行了统计仿真,仿真结果表明该方法对制导参量敏感程度较低,对UUV与目标航行器相对阵位的适应能力强,在现有制导参量精度要求条件下能够满足垂直命中工程要求,考虑命中部位时,可垂直命中大型水下航行器中间部位,垂直命中概率有明显提高。文中提出的方法具有合理性和可行性,能够提高对大型水下航行器的毁伤效果。

舌下排瘀综合疗法治疗高血压经验浅析

高血压是一种广泛存在的慢性病,对患者的健康构成严重威胁,同时也是中国面临的重大公共卫生挑战。高血压的病因主要体现为瘀血,在治疗原则上强调活血化瘀通络。在高血压病证结合、辨证施治基础上,通过记录舌下排瘀综合疗法治疗高血压的经验,以期为临床治疗高血压开拓新的思路。

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.

Study on the method of optimal location on explosion events at near-source site

IntroductionEarthquake location is one of the inverse problems in seismology. The accurate earthquake source location is the basis of studies of earthquake images, the relation analysis between seismicity and tectonics, and the important parameters of earthquakes. It is also the basic data used to study the space distribution of aftershocks after a strong earthquake. The earthquake location accuracy mainly depends on reliability of the velocity models for the earth￠s crust, the reasonable design of the seismograph network, the accuracy of arrival time, and the location method used (ZHAO, 1983; ZHU, ZHAO, 1997; LI, et al, 1999). The reliability of the velocity model directly influences loca-tion results. The reasonable seismograph network design can improve the location accuracy; otherwise it will in-troduce ill-conditioned equations and large location error. If arrival time is not accurate, for example, if the seismic phase is wrongly identified or the time service is inaccurate, large arrival time error will be produced, and the location results and real hypocenters will be discordant. Different location algorithms adopted will produce differ-ent location errors. The residual criterion chosen has influence on location results. Besides, whether the event is correctly associated also influences the location quality. In practice, it can often be seen that large location devia-tion introduced by wrong event association.

A New Thioamide Derivative for Separation and Preconcentration of Multi Elements in Aquatic Environment by Cloud Point Extraction

2-(pyridine-2-yl)-N-p-chlorohydrazinecarbothioamide (HCPTS) was synthesized, characterized and successfully applied for the preconcentration of Cu(II), Ni(II), Zn(II), Cd(II), Co(II), Pb(II), Fe(II), and Hg(II) in water, blood, and urine samples prior to graphite furnace atomic absorption determination (GFAAS);Hg was determined by cold vapor technique. Under the optimum experimental conditions (i.e. pH = 8, 10–4 M of HCPTS, 0.05% w/v of Triton X-114), calibration graphs were linear in the range of 0.02 to 200 ng?mL–1 for Co(II), Cd(II), Pb(II) and Ni(II);0.03 to 200 ng?mL–1 for Cu(II);0.07 to 200 ng?mL–1 for Fe(II) and Zn(II) and 0.02 to 150 ng?mL–1 for Hg(II). The enrichment factors were 43, 51, 41, 46, 54, 40, 45 and 52 for Cu(II), Ni(II),Zn (II), Cd(II), Co(II), Pb(II), Fe(II), and Hg(II), respectively. The limit of detection were found to be 0.019, 0.094, 0.0514, 0.052, 0.0165, 0.047, 0.068 and 0.041 ng?mL–1 for Cu(II), Ni(II), Zn(II), Cd(II), Co(II), Pb(II), Fe(II), and Hg(II), respectively. The developed method was applied to the determination of these metal ions in water, blood and urine samples with satisfactory results.

Observation of a diverse deviation from macropore-formation theory in silicon electrochemistry

Via anodizing patterned and unpatterned samples with a high HF concentration （[HF]）, the degree of deviation from pore-formation theory was found to be markedly different. Based on the analysis of scanning electron microscope （SEM） micrographs and current-voltage （I - V） curves, the variation of physical and chemical parameters of patterned and unpatterned substrates was found to be crucial to the understanding of the observations. Our results indicate that the initial surface morphology of samples can have a considerable influence upon pore formation. The electric-field effect as well as current-burst-model was employed to interpret the underlying mechanism.

Fixed Point Theorems of the Iterated Function Systems

In this paper, we present some fixed point theorems of iterated function systems consisting of α-ψ-contractive type mappings in Fractal space constituted by the compact subset of metric space and iterated function systems consisting of Banach contractive mappings in Fractal space constituted by the compact subset of generalized metric space, which is Mso extensively applied in topological dynamic system.

Population Spatial Distribution Based on Luojia 1-01 Nighttime Light Image:A Case Study of Beijing

With the continuous development of urbanization in China,the country’s growing population brings great challenges to urban development.By mastering the refined population spatial distribution in administrative units,the quantity and agglomeration of population distribution can be estimated and visualized.It will provide a basis for a more rational urban planning.This paper takes Beijing as the research area and uses a new Luojia1-01 nighttime light image with high resolution,land use type data,Points of Interest(POI)data,and other data to construct the population spatial index system,establishing the index weight based on the principal component analysis.The comprehensive weight value of population distribution in the study area was then used to calculate the street population distribution of Beijing in 2018.Then the population spatial distribution was visualize using GIS technology.After accuracy assessments by comparing the result with the WorldPop data,the accuracy has reached 0.74.The proposed method was validated as a qualified method to generate population spatial maps.By contrast of local areas,Luojia 1-01 data is more suitable for population distribution estimation than the NPP/VIIRS(Net Primary Productivity/Visible infrared Imaging Radiometer)nighttime light data.More geospatial big data and mathematical models can be combined to create more accurate population maps in the future.

A New Critical Value Concerning the Genealogy of Long Period Families at L_4 in the Restricted Three-body Problem

We found another critical mass ratio value -↑μ between μ4 and μ5 concerning the genealogy of the long period family around the equilateral equilibrium point L4 in the restricted three-body problem. This value has not been pointed out before. We used numerical computations to show how the long period family evolves around this critical value. The case is similar to that of the critical values between μ2 and μ4, with slight difference in evolution details.

面向高速目标的临近空间飞机拦截平台制导方法

针对高超声速目标拦截,提出一种基于临近空间飞机平台的制导策略,可充分利用临近空间飞机平台中制导修正能力强、拦截覆盖范围大、携带多枚拦截器、平台可重复使用等优势。该拦截制导方案主要涵盖临近空间目标弹道预报、拦截预测命中点规划、高速飞机平台中制导律设计与拦截器-目标末制导律设计4个部分。弹道预报方面,给出一种基于辨识目标加速度模型的弹道预报方法;预测命中点规划方面,提出一种高效的搜索算法完成预测命中点规划;中制导律设计方面,提出一种双层在线制导律的设计方法,该方法可以快速在线规划飞行轨迹,提高中制导纠偏能力;末制导律设计方面,给出一种满足攻击角度和闭环攻击时间约束的协同末制导方法。通过开展仿真验证了该方法可以为临近空间目标拦截提供有效的研究思路。