基于用电采集终端的抄表稳定性自动化测试系统

针对现场用电采集终端多任务并发、多采集对象、多数据类型的新业务需求,保证全量数据的完整采集,本文设计了一种基于用电采集终端的抄表稳定性自动化测试系统,可自动进行定时透抄测试和任务抄表测试,并综合分析出各用电采集终端的抄表稳定性的评估值。基于该系统验证的能源控制器已成功在国网安徽合肥滨湖区精品物联台区试点挂网运行,并取得了预期成果。

基于蒙特卡罗方法的率值稳定性定量分析(Ⅰ)——随机检验误差对生料率值稳定性的影响

使用蒙特卡罗方法对随机检验误差对生料率值稳定性的影响进行了模拟计算。结果表明,在生料化学成分SiO2、Al2O3、Fe2O3、CaO自身波动标准偏差分别为0.30%、0.10%、0.08%、0.45%的条件下,生料化学成分SiO2、Al2O3、Fe2O3、CaO检验标准偏差分别为0.050%、0.067%、0.050%、0.083%时,导致生料率值KH、SM、IM标准偏差分别增加0.0003、0.007、0.0094。化学成分检验标准偏差按倍数增加时,生料率值标准偏差随之增加,但与化学成分检验标准偏差增加的倍数不同。得到了4种主要化学成分检验标准偏差单位变化量对应的生料率值标准偏差变化量。

基于蒙特卡罗方法的率值稳定性定量分析(Ⅲ)——原料计量设备误差对生料率值稳定性的影响

使用误差理论和方法对原料计量设备误差的性质、特点,及对出磨生料率值稳定性的影响规律和程度进行了分析;使用蒙特卡罗方法模拟计算了原料计量设备随机误差与出磨生料率值标准偏差之间的定量关系。结果表明,当4种原料计量设备准确度等级为1%时,KH、SM、IM的标准偏差增量分别为:0.0026、0.0027、0.0022。

基于蒙特卡罗方法的率值稳定性定量分析(Ⅱ)——原料化学成分波动对生料率值稳定性的影响

使用蒙特卡罗方法对原料化学成分波动与生料率值稳定性之间的定量关系进行了模拟计算。结果表明,一种原料单一波动,石灰石的SiO2、Al2O3、Fe2O3、CaO的标准偏差分别为0.10%、0.02%、0.05%、0.15%时,生料KH、SM、IM的标准偏差分别为0.006、0.028、0.031;砂岩的SiO2、Al2O3、Fe2O3、CaO的标准偏差分别为0.80%、0.20%、0.50%、0.10%时,生料KH、SM、IM的标准偏差分别为0.005、0.033、0.038。这一结果揭示,相对于石灰石,砂岩的预均化同样不容忽视。石灰石和砂岩化学成分同时按上述标准偏差波动,生料KH、SM、IM的标准偏差分别为0.008、0.043、0.049。

植入扭矩对牙种植体初期稳定性影响的动物实验研究

目的:探讨植入扭矩值对种植体初期稳定性的影响,并探索达到种植体初期稳定性值的最佳植入扭矩范围。方法:选取六条纯种比格犬,拔除双侧下颌前磨牙和第一磨牙。拔牙术后3个月,于双侧下颌一共植入48枚XIVE种植体。根据种植体的最大植入扭矩值(ITV)将种植体分为4组:A组12枚,0<ITV<20N cm;B组12枚,20≤ITV<40 Ncm;C组12枚,40 Ncm≤ITV<60 Ncm;D组12枚,ITV≥60Ncm。种植体植入后立即测量该种植体的稳定性值(ISQ)。结果:A组与B组、C组、D组之间ISQ值有统计学差异(P<0.05);B组、C组、D组之间ISQ值无统计学差异(P>0.05)。结论:根据本研究,只要植入扭矩值达到20Ncm以上,种植体都能取得良好的初期稳定性。植入扭矩值不能全面反映影响种植体初期稳定性,应联合种植体稳定性系数(ISQ值)才能更全面地评估种植体的初期稳定性。

关于地面水中溶解氧值稳定性的探讨

水体中溶解氧值不稳定,但变化有规律。一天中昼间上升,夜间下降;垂向随水深的增加而减小。提出了瞬时溶解氧值缺乏代表性的观点。

边坡稳定性评价的一种半定量方法

以南京市某边坡为例,介绍了一种边坡稳定性评价的半定量方法。首先,根据边坡所处地质环境对其稳定性趋势作出分析,确定该边坡的稳定性影响因素;进而,根据对该地区同类型滑坡的统计,分析了影响因素与滑坡发生的相关性;在通过对比求和评分法得出了各影响因素的稳定性权重值之后,又根据相关性分析得出的结果,完成了影响因素的分级赋值;最后,得出了边坡稳定性的评价模型,并求出了不同降雨量情况下边坡的稳定性指数。

离子交换树脂调控黄冠梨汁色值研究

以黄冠梨试材,研究离子交换树脂对色值稳定性影响,重点明确离子交换树脂对不同腐烂程度果汁的色值调控效果。采用离子交换树脂与活性炭两种方法对果汁分别进行处理,同时三种离子交换树脂进行组合,比较色值、色值稳定性、总酚含量、氨基态氮含量的变化,结果表明:离子交换树脂组合处理的不同烂果率梨汁色值下降缓慢、色值稳定性显著提高、总酚含量以及氨基态氮含量相对下降,烂果率达到6%时能在40 d内满足车间要求的T440保持在45%以上的要求。其中,采用离子交换树脂组合处理烂果率6%浓缩汁得到最佳指标,36 d时色值稳定在透光率54.3%左右,d T440稳定在35%左右,氨基态氮下降50 mg/100 g,总酚下降25 mg/100 g。

采用场效应管稳幅的高稳定度正弦波信号源

广泛应用于通讯、测量和自动控制等领域中的正弦波发生电路,其输出信号的幅值稳定性影响着整个系统的性能。本文在分析文氏振荡电路的基础上,提出一种利用场效应管线性工作区实现稳幅的技术,同时给出了具有温度补偿环节的实际应用电路。

地磁DI仪基线值分析处理软件

现用前兆地磁处理软件的基线值计算功能不完善,导致观测结果滞后,从而制约了台站接收数据的及时性,影响了观测员补测时间的安排。该软件从根本上解决的接收数据的滞后性,能够及时了解观测结果,提高DI仪观测精度,减少观测次数,从而提高观测资料的内在质量。

不同厂家二氯异氰脲酸钠消毒效果对比试验

为比较两个厂家的二氯异氰脲酸钠的消毒效果,按说明配成不同浓度的消毒液,从消毒效果、腐蚀性、消毒液pH稳定性和成本等方面进行比较。结果显示:两个厂家的二氯异氰脲酸钠对大肠杆菌的消毒效果相同;B消毒药的腐蚀性比A消毒药大;相同浓度的消毒药pH值稳定性无差异;配置等量相同浓度消毒药,B比A成本高0.2元。此结果可作为养殖场选择消毒剂的参考。

光纤陀螺仪测试研究

论述了光纤陀螺仪测试系统的组成。对光纤陀螺仪的偏值稳定性、输入轴失准角和随机游走系数等进行了测试和分析，对陀螺仪随机漂移模型进行了辨识，分析了转台误差对陀螺仪输入轴失准角测试精度的影响．所得结论为陀螺仪生产工艺的改进。

高粘度酸液在人工裂缝中流态规律研究

随着油气田勘探开发应用技术的不断深入,高粘度酸液越来越多地应用到不同类型的复杂致密油气藏的储层改造中。高粘度酸液可以降低滤失量、减缓反应速率,实现酸液的深度穿透。研究高粘度酸液在人工裂缝中的流动状态对模拟其滤失和酸岩反应过程具有重要意义。运用幂律流体的雷诺数分析法和稳定性Z值法,对高粘度酸液在地层裂缝中的流动状态进行了研究。分析发现影响高粘度酸液流态的主要因素有酸液排量、裂缝高度、裂缝宽度、酸液稠度系数、流态指数。其中酸液的稠度系数为主控因素。当稠度系数小于0.015Pa.sn时,常规施工中的地层酸液为紊流状态。因此普通酸酸化时的地层酸液为紊流状态,而常规酸压中高粘度的稠化酸和交联酸在地层中一般为线性层流状态。研究认为增加排量对酸液的流态影响不大。

动态高压微射流对茎菠萝蛋白酶性质和构象的影响

以茎菠萝蛋白酶为原料,研究动态高压微射流(DHPM)对其活性、稳定性和构象的影响。结果显示:DHPM对茎菠萝蛋白酶具有钝化作用,但活力并不随着压力的升高而降低。压力为60、80、100、120MPa时,茎菠萝蛋白酶的相对酶活力分别是94%、93%、98%及92%。DHPM不同压力对茎菠萝蛋白酶的最适反应温度的影响不同,但对最适pH值几乎没有影响。然而经DHPM60、120MPa处理后,茎菠萝蛋白酶在pH8.0的稳定性显著增强。在pH8.0保温40min后,60、120MPa处理的茎菠萝蛋白酶相对酶活力分别为85%和82%,分别比未经处理的高14%和11%。可见,DHPM60、120MPa处理极大地提高了茎菠萝蛋白酶在pH8.0时的稳定性。此外,紫外光谱和荧光光谱的结果表明:DHPM导致茎菠萝蛋白酶部分去折叠,分子中赖氨酸和色氨酸残基所处的微环境发生了变化;红外光谱结果显示:DHPM处理后茎菠萝蛋白酶二级或三级结构发生了变化。

The Stability of Endomorphin-1 Solution

Aim To study the most stable pH value of endomorphin-1 solution and toestimate the shelf-life of EM-1 solution. Methods The content of EM-1 in its solution was determinedby HPLC, and stability was studied by accelerated tests. Results The most stable pH value of EM-1solution was observed. By the accelerated tests we obtained the Arrhe-nius relationship and thepharmacokinetic parameters. Conclusion The most stable pH value of EM-1 solution is 4.5 -4.8. Thet_(1/2)(25℃) is 45 d.

Stability of finite difference numerical simulations of acoustic logging-while-drilling with different perfectly matched layer schemes

In acoustic logging-while-drilling （ALWD） finite difference in time domain （FDTD） simulations, large drill collar occupies, most of the fluid-filled borehole and divides the borehole fluid into two thin fluid columns （radius -27 mm）. Fine grids and large computational models are required to model the thin fluid region between the tool and the formation. As a result, small time step and more iterations are needed, which increases the cumulative numerical error. Furthermore, due to high impedance contrast between the drill collar and fluid in the borehole （the difference is 〉30 times）, the stability and efficiency of the perfectly matched layer （PML） scheme is critical to simulate complicated wave modes accurately. In this paper, we compared four different PML implementations in a staggered grid finite difference in time domain （FDTD） in the ALWD simulation, including field-splitting PML （SPML）, multiaxial PML（M- PML）, non-splitting PML （NPML）, and complex frequency-shifted PML （CFS-PML）. The comparison indicated that NPML and CFS-PML can absorb the guided wave reflection from the computational boundaries more efficiently than SPML and M-PML. For large simulation time, SPML, M-PML, and NPML are numerically unstable. However, the stability of M-PML can be improved further to some extent. Based on the analysis, we proposed that the CFS-PML method is used in FDTD to eliminate the numerical instability and to improve the efficiency of absorption in the PML layers for LWD modeling. The optimal values of CFS-PML parameters in the LWD simulation were investigated based on thousands of 3D simulations. For typical LWD cases, the best maximum value of the quadratic damping profile was obtained using one do. The optimal parameter space for the maximum value of the linear frequency-shifted factor （a0） and the scaling factor （β0） depended on the thickness of the PML layer. For typical formations, if the PML thickness is 10 grid points, the global error can be reduced to 〈1% using the optimal PML parameters, and the error will decrease as the PML thickness increases.

基于Hilbert-Huang变换的机场路基智能压实振动信号分析

以某通用机场飞行区扩建项目部分路基段作为试验场地,通过在振动压路机车轮处布置传感器采集振动轮竖向加速度数据,利用Hilbert-Huang变换从时频域与稳定性两个方面来研究持续的压实工作下振动波自振动轮至填料深处全过程的传播机制及机场路基的压实质量。结果表明:(1)振动轮能量主要集中于低频部分,且随着碾压遍数的增加,振动轮所携带的能量逐渐增加,但能量较为分散且传递效率偏低;(2)Hilbert-Huang变换谱能够全面、系统地反映任意时刻振动信号的时域特征,对于同一碾压遍数的不同道次一般边际谱曲线差异不大,说明同一压实层质量不均匀性较小,若曲线出现明显异常,可识别潜在薄弱区域并采取人工换填或继续压实措施,保障路基的压实质量;(3)将随机信号理论中的信号平稳性度量引入压实质量的稳定性表征,通过算法的应用,提供了一种快速、全面、实时性强的压实质量稳定性表征方法,可以从不同碾压遍数、不同位置分析评估压实质量的稳定性,进而指导压路机驾驶员的操作。研究结论可为定量评估路基压实质量稳定性提供帮助。

Stability analysis for nonlinear multi-variable delay perturbation problems

This paper discusses the stability of theoretical solutions for nonlinear multi-variable delay perturbation problems (MVDPP) of the form x′(t)=f(x(t),x(t-τ 1(t)),...,x(t-τ m(t)),y(t),y(t-τ 1(t)),...,y(t-τ m(t))), and εy′(t)=g(x(t),x(t-τ 1(t)),...,x(t-τ m(t)),y(t),y(t-τ 1(t)),...,y(t-τ m(t))), where 0<ε1. A sufficient condition of stability for the systems is obtained. Additionally we prove the numerical solutions of the implicit Euler method are stable under this condition.

Numerical simulation for influence of excavation and blasting vibration on stability of mined-out area

Dynamic analysis steps and general flow of fast lagrangian analysis of continua in 3 dimensions(FLAC3D) were discussed. Numerical simulation for influence of excavation and blasting vibration on stability of mined-out area was carried out with FLAC3D. The whole analytical process was divided into two steps, including the static analysis and the dynamic analysis which were used to simulate the influence of excavation process and blasting vibration respectively. The results show that the shape of right upper boundary is extremely irregular after excavation, and stress concentration occurs at many places and higher tensile stress appears. The maximum tensile stress is higher than the tensile strength of rock mass, and surrounding rock of right roof will be damaged with tension fracture. The maximum displacement of surrounding rock is 4.75 mm after excavation. However, the maximum displacement increases to 5.47 mm after the blasting dynamic load is applied. And the covering area of plastic zones expands obviously, especially at the foot of right upper slope. The analytical results are in basic accordance with the observed results on the whole. Damage and disturbance on surrounding rock to some degree are caused by excavation, while blasting dynamic load increases the possibility of occurrence of dynamic instability and destruction further. So the effective supporting and vibration reducing measures should be taken during mining.

Numerical analysis of deformation and failure characteristics of deep roadway surrounding rock under static-dynamic coupling stress

In actual production,deep coal mine roadways are often under typical static-dynamic coupling stress(SDCS)conditions with high ground stress and strong dynamic disturbances.With the increasing number of disasters and accidents induced by SDCS conditions,the safe and efficient production of coal mines is seriously threatened.Therefore,it is of great practical significance to study the deformation and failure characteristics of the roadway surrounding rock under SDCS.In this paper,the effects of different in-situ stress fields and dynamic load conditions on the surrounding rock are studied by numerical simulations,and the deformation and failure characteristics are obtained.According to the simulation results,the horizontal stress,vertical stress and dynamic disturbance have a positive correlation with the plastic failure of the surrounding rock.Among these factors,the influence of the dynamic disturbance is the most substantial.Under the same stress conditions,the extents of deformation and plastic failure of the roof and ribs are always greater than those of the floor.The effect of horizontal stresses on the roadway deformation is more notable than that of vertical stresses.The results indicate that for the roadway under high-stress conditions,the in-situ stress test must be strengthened first.After determining the magnitude of the in-situ stress,the location of the roadway should be reasonably arranged in the design to optimize the mining sequence.For roadways that are strongly disturbed by dynamic loads,rock supports(rebar/cable bolts,steel set etc.)that are capable of maintaining their effectiveness without failure after certain dynamic loads are required.The results of this study contribute to understanding the characteristics of the roadway deformation and failure under SDCS,and can be used to provide a basis for the support design and optimization under similar geological and geotechnical circumstances.