GENERALIZED TRANSFER FUNCTION OF CONTROL SYSTEM AND AN IMPROVEMENT ON THE DECISION METHOD OF MOVEMENT STABILITY

In this paper the definitions of generalized transfer functios of control system and itscontinuity are presented.Using generalized transfer function as a tool,a set of theorems fordeciding movement stability have been constructed.Thus basing understanding of thecharacteristics of a control dynamics system on its measured procedure will simplify thedecision method of movement stability problems.

A Physical Method of Analyzing theMechanism of Continental StrongShocks from Crustal Movement

In order to analyze the mechanism of continental strong shocks from the angle of crustal movement using the data of repeated geodetic survey, this paper has proposed a physical method; it analyzes the mechanism of density change due to the occurrence of strong shocks by use of the physical quantity that reflects the time change of crustal density. (1) The general theory of the time change of density in the earth’ s interior and the theory of the time change of single layer density have been introduced, and an algorithm of stepwise iteration has been proposed; (2) The effect of the change of single layer density caused by fault dislocation has been analyzed in brief; (3) The characteristics of the time change of crustal density in the south of the seismogenic region before the 1996 Lijiang earthquake with M_L =7.0 have been studied; (4) The precursor model or causal mechanism of strong shocks possibly existing in the time change of crustal density has been investigated preliminarily.

Calculation of maximum ground movement and deformation caused by mining

In order to know the maximum mining ground deformation of arbitrary surface point, directions of the maximum surface tilt, curvature,horizontal displacement and horizontal deformation caused by multi-working faces were deduced based on probability integral method. The distribution forms of surface deformations in all direction φ∈[0, 2π] were obtained and also equations of maximum deformations were given based on calculation of mining ground deformation in direction φ. A mining subsidence analysis system was developed with VB6.0. The system implements the probability integral mining subsidence prediction with direct integration method, and it can avoid errors of arbitrary shaped working face subdivision of traditional method, and accuracy of mining subsidence prediction can be improved with the direct integral method. The system implements the contour chart and profile chart and also data analysis automation by manipulation of the SURFER kernel function and it complements the defect of existing subsidence prediction software. Calculation of maximum deformations caused by multi-working faces mining in a coal mine of Xuzhou, China was shown as application example. Engineering application indicates that maximum deformation of mining ground surface can be calculated and analyzed by the system. The research provides a theoretical basis and calculation tool for mining subsidence prediction and analysis.

Three-dimensional Finite Element Analysis of the Mechanical Stress on Root from Orthodontic Tooth Movement by Sliding Mechanics

In order to study mechanical stress on root from orthodontic tooth movement by sliding mechanics, a 3-dimensional finite element model incorporating all layers of a human mandibular dental arch with orthodontic appliance has been developed to simulate mechanical stress on root from the orthodontic tooth movement. Simulated orthodontic force of 2 N at 0, 30 and 45 degree from the horizontal axis was applied to the crown of the teeth. The finite element analysis showed when orthodontic forces were applied to the tooth, the stress was mainly concentrated at the neck of the tooth decreasing uniformly to the apex and crown. The highest stress on the root was 0.621 N/mm^2 for cervical margin of the canine, and 0.114 N/mm^2 for apical region of the canine. The top of canine crown showed the largest amount of displacement （2.417 μm）, while the lowest amount of displacement was located at the apical region of canine （0.043 μm）. In conclusion, this model might enable one to simulate orthodontic tooth movements clinically. Sliding force at 2 N is ideal to ensure the bodily orthodontic tooth movement. The highest stress concentration in the roots was always localized at the cervical margin when orthodontic force of 2 N at 0, 30 and 45 degree from the horizontal axis, so there may be the same risk of root resorption when orthodontic force of 2 N at 0, 30 and 45 degree was used in clinic cases.

Nodeless variable finite element method for heat transfer analysis by means of flux-based formulation and mesh adaptation

Based on flux-based formulation, a nodeless variable element method is developed to analyze two-dimensional steady-state and transient heat transfer problems. The nodeless variable element employs quadratic interpolation functions to provide higher solution accuracy without necessity to actually generate additional nodes. The flux-based formulation is applied to reduce the complexity in deriving the finite element equations as compared to the conventional finite element method, The solution accuracy is further improved by implementing an adaptive meshing technique to generaie finite element mesh that can adapt and move along corresponding to the solution behavior. The technique generates small elements in the regions of steep solution gradients to provide accurate solution, and meanwhile it generates larger elements in the other regions where the solution gradients are slight to reduce the computational time and the computer memory. The effectiveness of the combined procedure is demonstrated by heat transfer problems that have exact solutions. These problems tire： （a） a steady-state heat conduction analysis in a square plate subjected to a highly localized surface heating, and （b） a transient heat conduction analysis in a long plate subjected to moving heat source.

WATER AND SALT MOVEMENTS IN SIMULTANEOUS FLOOD-IRRIGATION AND WELL-DRAINAGE OPERATIONS

This paper describes a new technology for solonchak soil reclamation in which surface flood irrigation of fresh water and pumped wells drainage of salty groundwater are combined. The comprehensive investigation of water and salt movement has been conducted through field test, laboratory simulation and numerical calculation. The dependence of desalination on irrigation water quantity, drainage quantity, leaching time and other parameters is obtained based on the field tests. The entire desalination process under the flood-irrigation and well-drainage operations was experimentally simulated in a vertical soil column. The water and salt movement has been numerically analysed for both the field and laboratory conditions. The present work indicates that this new technology can greatly improve the effects of desalination.

The Homotopy Perturbation Renormalization Group Method to Solve the WKB Problem with Turn Points

In this paper,we give the homotopy perturbation renormalization group method,this is a new method for turning point problem.Using this method,the independent variables are introduced by transformation without introducing new related variables and no matching is needed.The WKB approximation method problem can be solved.

Numerical Simulation of Waves Generated by Seafloor Movements

Waves generated by vertical seafloor movements are simulated by use of a fully nonlinear two-dimensional numerical wave tank. In the souree region, the seafloor lifts to a designated height by a generation function. The numerical tests show that the linear theory is only valid for estimating the wave behaviors induced by the seafloor movements with a small amplitude, and the fully nonlinear numerical model should be adopted in the simulation of the wave generation by the large amplitude seafloor movements. Without the background surface waves, many numerical tests on the stable maximum elevations η0^max are carried out by beth the linear theory and the fully nonlinear model. The results of two models are compared and analyzed. For the fully nonlinear model, the influences of the amplitudes and the horizontal lengths on η^max are stronger than that of the characteristic duration times. Furthermore, results reveal that there are significant differences be- tween the linear theory and the fully nonlinear model. When the influences of the background surface waves are considered, the corresponding numerical analyses reveal that with the fully nonlinear model the η0^max near-linearly varies with the wave amplitudes of the surface waves, and the η0^max has significant dependences on the wave lengths and the wave phases of the surface waves. In addition, the differences between the linear theory and the fully nonlinear model are still obvious, and these differences are significantly affected by the wave parameters of the background surface waves, such as the wave amplitude, the wave length and the wave phase.

GSPAC water movement in extremely dry area

Under an extremely arid condition,a PVC greenhouse was built on the top of Mogao Grottoes in gobi area.The results of 235-day constant extraction of condensed water on the greenhouse film and soil water content showed that 2.1 g/（m2·d） groundwater moved up and exported into the soil,and a phreatic water evaporation existed in the extreme dry area where the groundwater is buried deeper than 200 m.After a prolonged export,the soil water content in the greenhouse was not lower but obviously higher than the original control ones.According to the monitored parameters including relative humidity and absolute humidity of soil,and temperature outside and inside the greenhouse,it was found that there is the available condition and mechanism for the upward movement of groundwater,and also it can be sure that the exported water was not from the soil and atmosphere outside the greenhouse.Phreatic water,an important source for soil water,interacts with atmosphere moisture via soil respiration.Soil salinity also has important effects on soil water movement and spatial-temporal heterogeneity.The extremely dry climate,terrestrial heat and change of upper soil temperature are the fundamental driving forces of water transportation and phreatic water evaporation in the Groundwater-Soil-Plant-Atmosphere Continuum（GSPAC） system.

Exploration of Arabic reading, in terms of the vocalization of the text form by registering the eyes movements of pupils

The intrinsic factors such as the visual constraints, extrinsic such as biomechanics, interface such as the support: the writing, the linguistics, the typography, the sense of progress of the language, have their impact on the habit, and the fittest and particularly the efficiency in reading. We suspect that circuits and zones involved in horizontal orientation “right to the left” are not the same the other way around hanging the linguistic collection. Reading Arabic provided with a specific difference in vocalization proves to be a valuable model verification two major issues which arouse language perception: [lexical processing: is it instantaneous (visual memory) or delayed (memory-tampon)? ···]. And a comparison with other models of language detection mechanisms and brain areas mnemonics which is involved in making information. Results are significatively: children vocalized mode is best seen. It must extend the duration of the mode without vowels. In our opinion, our study is original, and we introduced what a valuable tool in the diagnosis of visual and cognitive strategy by the biotechnology technical based on variations in terms of reading. This opens a horizon of opportunity for the application of the method to the Arabic language to determine the differences in eye size reflecting the effects of task variables in reading and a comparative study of other languages.

基于IFM-KS模型的多层煤开采上覆岩层移动模型

双系煤层条件下的重复开采使得单层开采后已经趋于稳定的岩层再次“活化”,加剧了变形破坏的影响。因此,对煤层重复开采后引起的覆岩移动规律进行研究具有十分重要的意义。基于“力学模型+几何方法”融合的IFM-KS模型,提出了适用于多层开采条件下的岩层移动计算模型,揭示了煤层重复开采情况下岩层二次扰动后的移动变形规律。通过理论计算及UDEC数值计算方法验证了双系煤层开采情况岩层移动新模型的预测准确性。结果表明,理论计算的岩层位移结果与采用数值模拟得到的结果整体呈相同的沉降趋势,平均误差率约为15%。结合岩层移动模型计算结果,层间及上覆岩层空隙率的相关计算,与单层煤开采相比,双系煤层开采后造成的采空区空隙率变化剧烈,岩层破坏更加严重,上下采空区可通过裂隙沟通形成漏风通道。该计算模型能为类似采动件下岩层变形预计、采空区空隙率分布等提供一定的参考。

SD-265法治疗心胆气虚型慢性失眠的实效性随机对照研究

目的观察SD-265法治疗心胆气虚型慢性失眠患者的临床疗效。方法将2020年8月—2022年8月就诊于中国中医科学院广安门医院(南区)睡眠医学中心、中国中医科学院广安门医院针灸门诊及招募的64例慢性失眠患者随机分为2组,观察组34例采用SD-265法治疗,对照组30例采用温胆汤口服,2组均治疗1周。观察2组治疗前后主观指标[匹兹堡睡眠质量指数量表(PSQI)总分、入睡时间、睡眠时间、睡眠效率]及客观指标(体动记录仪记录的睡眠潜伏期、清醒次数、入睡后清醒时间、总睡眠时间、睡眠效率)变化。结果与治疗前比较,2组治疗后PSQI总分均明显降低,入睡时间均明显缩短,睡眠时间均明显增加,观察组睡眠效率明显提高,且观察组治疗后PSQI总分明显低于对照组,睡眠效率明显高于对照组,差异均有统计学意义(P均<0.05);与治疗前比较,2组治疗后睡眠潜伏期均明显缩短,睡眠效率均明显提高,观察组清醒次数减少,且观察组治疗后睡眠潜伏期明显短于对照组,差异均有统计学意义(P均<0.05)。结论SD-265法可在短期内缩短患者睡眠潜伏期,增加睡眠时长,提高睡眠效率,从而改善心胆气虚型失眠患者睡眠质量。

四川宝兴张家沟危岩体稳定性及运动学分析

张家沟危岩体在2022年“6•1”芦山地震后被发现,稳定性差,严重威胁下方居民生命财产安全。基于稳定性计算及离散元数值分析方法对危岩体进行评价,选取稳定性最差的地震工况进行运动学分析,在上述研究基础上结合解析解与数值解成果设计相应防护措施。主要结论有:(1)张家沟危岩体结构破碎,顺坡向控制性结构面发育,破坏模式为滑移式;(2)稳定性计算与数值模拟结果皆表明张家沟危岩体在天然、暴雨、地震工况下均会失稳,其中地震工况下运动距离最长;(3)地震工况下危岩体的破坏模式为震裂—滑移式,运动过程中块石以滑移为主,跳高较小,同时坡面形态显著影响着落石运动特征;(4)落石间相互碰撞挤压会改变其运动特征及冲击动能大小,在一定程度上可增加致灾范围。成果可为类似灾害防治提供参考。

液压锥阀启闭过程及空化的研究

在锥阀启闭过程中,阀口处流道形状较为复杂,这会促使阀口处产生空化,从而对液压系统的稳定性和可靠性产生不利影响。通过OpenFOAM 3个分支版本的foam-extend-4.1开发出应用浸没边界法的两相空化流动求解器,使用该求解器在阀芯启闭过程及阀口空化的数值模拟研究中尝试应用浸没边界法且得到了较好的计算效果。研究表明,开阀时的空化是因为阀口处高速射流所导致的射流空化,关阀时的空化是由于液压油惯性导致的二次空化。

Analysis of the Impact on Hydraulic Facilities Due to Underground Mining Based on the Influence Function Method

A mathematical model based on influence function method was established to predict the surface movement and deformation due to underground mining, and the impact on the upper hydraulic facilities in one coal mine was analyzed used the model. The analysis indicates: the maximum surface subsidence reaches 3.5 m, and the predicted maximum horizontal surface deformation reaches 7.0 mm/m, which would result in crack, deformation and uneven settlement in the soil foundation of the upper hydraulic facilities and influence the quality directly. Therefore, reasonable engineering measurements should be adopted to ensure the safe operation.

基于“和法”探析儿童功能性便秘的辨治思路

小儿功能性便秘是儿科常见疾病之一,本研究旨在探讨该病的中医治疗思路,以“和法”为核心理论框架。首先,追溯“和”法的历史渊源和理论内涵,深入阐述了其核心概念及应用背景。其次,认为“气机失和,传导失司”为本病的核心病机,着重强调气机与大肠之间相互联系。并进一步深入探讨了治疗该病的原则,提出了“祛邪扶正,和调气机,通达肠腑”为治疗策略的核心,包括内外协调、脏腑平衡、津液维护、情志调节和饮食安排等方面。本研究拓展了儿童功能性便秘治疗的理论视野,突显了中医传统理论在处理小儿消化问题中的关键地位,有望为改善儿童功能性便秘提供有益的指导。

Theoretical Computation of Nonlinear System Equations of Heavier Pellets Movements for Two Phase Flow

This paper presents nonlinear ordinary differential equations (ODES) of the heavier pellets movement for two phase flow, which actually represent a system of equations. The usual methods of solution such as Runge -Kutta method and it's datum results are discussed. This paper solves ODES of general form using variable mesh-length, linearizing the nonlinear terms by finite analysis method, fuilding an iteration sequence, and amending the nonlinear terms by iteration . The conditions of convergent operation of iteration solution is checked. The movement orbit and velocity of the pellets are calculated. Analysis of research results and it's application examples are illustrated.

李果烈从气机失常辨治眩晕与头昏经验

眩晕和头昏是临床常见疾病,因二者症状相似、难以严格区分,临床医生常将头昏笼统归入眩晕进行治疗。李果烈教授着眼于气机变化,认为眩晕与头昏症状不同、病机各异,治疗应采用与病机相应的调气法。眩晕患者有自觉外界事物或自身旋转症状,病机以气机上逆为主,治疗可采用疏肝降逆法(处方以镇肝熄风汤加减)和疏肝泄浊法(处方以半夏白术天麻汤化裁);头昏患者无旋转症状,病机以气机下陷为主,治疗可采用补脾升陷法(处方以补中益气汤加减)和健脾通滞法(处方采用二陈汤)。附验案2则。

含孔板微通道内随流气泡运动的两相格子Boltzmann模拟

带有气泡的两相流系统存在于各种工业过程中,涉及复杂的相界面变化,但气泡在管道中伴随液相流动时,通过孔板的运动过程尚未有充分的研究结果.相场格子Boltzmann模型在模拟复杂界面方面具有优势,适合研究气泡两相流在含孔板微通道内的运动,分析We数、气泡相对大小和孔板表面润湿性等因素对气泡动力学特性的影响.数值计算结果显示,随着We数增加,气泡表面张力减小,导致其穿过孔板结构时更易被撕裂,峰值速度降低.在研究的参数范围内存在两个临界直径比,这两个临界值将气泡通过孔板的运动分成三种形态,而且临界直径比会随We数的增加而减小.另外,随着接触角的增大,孔板表面对气体的吸附能力加强,气泡与孔板表面的接触面积增加,引起穿过孔板气泡的质量减少和气泡通过的速度增加.

直流电压下油纸绝缘纤维杂质迁移运动特性及动力分析模型

换流变压器阀侧绕组运行过程中长期承受直流电场分量,其内部纤维杂质易积聚成桥,严重影响复合绝缘性能。为此,探究了直流电压下油纸绝缘纤维杂质迁移运动特性,对其轨迹、速度、偏移距离等特征参数进行了定量分析。在此基础上,建立了直流电压下纤维杂质动力分析模型,还原了纤维杂质的整个运动轨迹,并定量解释了其运动过程中速度及偏移距离变化的动力学机制。结果表明:球板电极下,单个纤维杂质在电极间往复运动,同时向强场区域水平迁移。其单次运动周期分为“抬升”、“上升”、“下降”3个阶段,最大运动速度可达10^(2)mm/s量级。随加压时间增加,油中纤维杂质在强场区域积聚为杂质小桥,小桥间因同号电荷相斥最终呈现中间密集而边缘稀疏的形态特征。仿真研究纤维杂质迁移运动特性,发现其“上升”阶段运动速度先急速增大再缓慢增加,“下降”阶段速度则先急剧增大至极大值而后逐渐减小,最大加速度可达10^(2)m/s^(2)量级。进一步地,纤维杂质运动过程中水平方向偏移距离随碰撞次数增加逐渐减小,其关系服从指数函数。以上研究可明确直流电压下纤维杂质全运动过程,实现杂质动力学特征定量计算,为后续纤维杂质绝缘危害性评估工作提供理论依据。