程序控制结构的偏加语义

介绍程序控制结构的偏加语义．首先对程序语言的结构（包括顺序、条件、循环等）进行函数化，然后引出程序语义的描述工具——偏加范畴。

考虑主应力轴偏转角影响的饱和软粘土路基长期沉降分析

基于循环三轴试验基础上的交通荷载路基沉降计算模型未能反映主应力轴偏转现象,而建立在不同围压的饱和软粘土恒定主应力轴偏转角的不排水循环加载试验基础上的循环累应变显式模型、累积孔压显式模型能考虑主应力轴偏转的现象。基于拟静力有限元计算、恒定主应力轴偏转角循环累积塑性变形及累积孔压显式模型相结合的思路,提出了考虑主应力轴偏转角影响的交通荷载作用下软土地基长期运营沉降的实用分析方法,并应用于高速公路工程的长期沉降预测。

雷达标校系统中定向灵敏度标定方法及其应用

针对目前船载测控设备放球标定中采用的自跟踪固定加偏工作方式的不足,通过对加偏电压乘以俯仰角度余弦的方法,消除正割补偿对标定的不良影响,提出一种采用自跟踪无级加偏与固定加偏相结合的工作方式,该方法操作简单、直观,并经过多次任务的检验,收到较好的效果。

各向异性和偏轴加载对1050车轮钢疲劳性能的影响

研究了各向异性和偏轴加载对轧制1050车轮钢疲劳性能的影响,获得试样在2种特定加载条件下的疲劳极限,运用SEM观察疲劳断口形貌,并利用有限元分析软件Ansys对0°、30°、45°3个不同偏轴加载角度的试样进行静力学分析。结果表明:随着试样与轧制方向角度的增加,疲劳极限逐渐降低,0°到45°下降比例约为9%;随着试样偏轴加载角度的增加,疲劳极限亦逐渐降低,0°到45°下降比例约为85%;在偏轴加载的情况下,试样承受的剪切应力与Von Mises等效应力较大,且随着偏轴加载角度的增加而增加。

Method based on fuzzy linguistic scale and FIOWGA operator for decision-making problems

In this paper, we present a fuzzy linguistic scale, which is characterized by triangular fuzzy numbers on [1/9, 9], for the comparison between two alternatives, and introduce a possibility degree formula for comparing triangular fuzzy numbers. We utilize the fuzzy linguistic scale to construct a linguistic preference matrix, and propose a fuzzy induced ordered weighted geometric averaging (FIOWGA) operator to aggregate linguistic preference information. A method based on the fuzzy linguistic scale and FIOWGA operator for decision-making problems is presented. Finally, an illustrative example is given to verify the developed method and to demonstrate its feasibility and effectiveness.

罗铨运用加减散偏汤辨治顽固性偏头痛经验

介绍罗铨教授运用加减散偏汤辨治顽固性偏头痛经验。罗教授认为凡辨证为肝胆气郁、少阳经腧不利的顽固性偏头痛,可从疏通少阳经气为主入手治疗,兼顾厥阴经腧,疗效可期;罗教授结合现代人群发病特点及地区差异,在经方散偏汤基础上加减化裁而成加减散偏汤,治疗本病获得良效。并附验案2则,以资佐证。

A migration imaging method using CGP stacked cylindrical waves

In view of the seismic exploration problem of thin sand reservoirs in the Songliao Basin, this paper puts forward a migration imaging method using CGP （common geophone point） stacked cylindrical waves. By this means, seismic data should be acquired from a midpoint shooting layout system with small shot-point spacing and small geophone interval. Using such seismic data, CGP gathers are first stacked to compose a cylindrical wave section. The cylindrical wave section is migrated and imaged by means of the ray path downward continuation of the down-going wave and the wave equation downward continuation of the upgoing wave. The results from the modeling analysis and the data processing of the TK8157 seismic line in the Songliao Basin shows that the proposed migration imaging method has higher seismic resolution and fidelity. Furthermore, the proposed method is proven to be more effective for discovering small sand bodies, small faults, stratigraphic pinch-outs, and so on.

一种基于加表零偏稳定性的GNSS/SINS组合导航异常探测方法

在地面车载组合导航中,全球导航卫星系统（global navigation satellite system,GNSS）的观测值容易受地面复杂环境的干扰,导致其定位结果出现异常,严重影响GNSS/捷联惯性导航系统（strap-down inertial navigation system,SINS）组合的滤波解算。从惯导系统误差特性的角度,研究了一种基于加表零偏稳定性的组合导航异常探测新方法。该方法从加表零偏解算的异常来发现GNSS位置、速度等观测值中的粗差,并采取剔除和降权的抗差方法抵御粗差影响。通过一组车载数据的分析表明,观测粗差对加表零偏解算的影响十分显著,以此为判别条件能够准确地发现观测粗差。采用该方法后,位置误差、速度误差和姿态误差的均方根分别减小了70.8%、87.9%和77.7%,显著提高了组合导航的解算精度和鲁棒性,为组合导航数据的抗差处理提供了一种新思路。

Effect of chemical conditioning on the triboelectrification of coal and mineral particles

Chemical conditioning was used to modify the triboelectrification of coal and mineral particles.The chemicals tested included starch,lignin,kerosene,ethanol,acetic acid,salicylic acid,sodium oleate,Sodium Hexametaphosphate(SH),sodium silicate, Sodium Dodecylbenzenesulfonate(SDBS),Sodium Bicarbonate(SB) and ammonia.A high-speed,dry mixing method was employed.The charge-to-mass ratio of the coal and mineral samples,both untreated and treated,was tested using a Faraday cup. Dielectric constants were determined by measuring capacitance.It is found that the selectivity of the additives toward coal or minerals is not consistent.Salicylic acid is the optimal additive to enhance the triboelectrification performance of coal samples.Starch, lignin and sodium oleate are suitable for removal of pyrite.SH,sodium silicate,SDBS,SB and ammonia are suitable additives for the removal of ash-forming minerals.

Possible Linear Superpositions for Special Solutions of the Fifth-Order KdV-Type Equations

Using Lou and Ni's deformation and mapping idea in nonlinear equations to a set of fifth order KdV type equations, it is found that some types of solitary wave solutions and periodic solutions with special velocities can be linearly superposed to new exact solutions.

Effects of automatic variable preload device on performance of spindle

To increase the machine accuracy by improving the stiffness of bearings,a preload was applied to bearings.A variable preload technology was necessary to perform machining processes in both low and high speed regions.An automatic variable preload device was fabricated using an eccentric mass.By installing the fabricated device on a spindle,the effect of the automatic variable preload device on the performance of the spindle was analyzed.In the results of the vibration measurement of the spindle,the vibration is increased by 20%-37% according to measurement points at the maximum rotation speed of 5 000 r/min.And,in the results of the noise measurement of the spindle,the spindle rotation speed is increased by about 1.9% and 1.5% at the front and side of the spindle,respectively.Based on the results of this analysis,an improved method that reduces such effects on the performance of the spindle is proposed.

Effect of Ta addition on solidification microstructure and element segregation of IN617B nickel-base superalloy

IN617B nickel-base superalloy is considered as a good candidate material in 700℃advanced ultrasupercritical coal-fired power plants.The effect of Ta addition on solidification microstructure and element segregation of IN617B alloy was investigated by OM,SEM,TEM,EDS,EPMA and thermodynamic calculation.The results showed that the solidification microstructure exhibited a dendritic segregation pattern with many primary carbides distributed in interdendritic regions,such as network M_(6)C,lath M_(23)C_(6) and granular Ti(C,N).The addition of Ta promoted the precipitation of Ta-rich MC significantly inhibiting the precipitation of M_(6)C and M_(23)C_(6),and reduced the segregation degree of Al,Mo and Ti alloying elements.The addition of Ta decreased the melting temperature of MC carbide,but did not impact the solidification path,that was,L→γmatrix→MC or Ti(C,N)→M_(6)C→M_(23)C_(6),where MC and Ti(C,N)tended to form symbiotic microstructure with M_(6)C.This study will provide theoretical basis and data support for the alloy optimization and casting structure control of IN617B nickel-based superalloy.

Fabrication of integrated resistors in printed circuit boards

In order to utilize integrated passive technology in printed circuit boards （PCBs）, manufacturing processing for integrated resistors by lamination method was investigated. Integrated resistors fabricated from Ohmega technologies in the experiment were 1 408 pieces per panel with four different patterns A, B, C and D and four resistance values of 25, 50, 75 and 100 fL Six panel per batch and four batches were performed totally. The testing was done for 960 pieces of integrated resistors randomly selected with the same size. The value distribution ranges and the relative standard deviation （RSD） show that the scatter degree of the resistance decreases with the resistor size increasing and/or with the resistance increasing. Patterns D with resistance of 75 and 100% for four patterns have the resistance value variances less than 10%. Patterns C and D with resistance of 100 Ω have the manufacturing tolerance less than 10%. The process capabilities are from about 0.6 to 1.6 for the designed testing patterns, which shows that the integrated resistors fabricated have the potential to be used in multilayer PCBs in the future.

Preference for Wood and Plastic-Based Ceiling Panels by Homeowners in Ghana： Implications for Tropical Forests Conservation and Prospects for the Local Wood Industry

This study investigated the preference for wood and plastic-based ceiling panels by homeowners in Ghana, the implications for the conservation of tropical forests and prospects for the local wood processing industry. Questionnaire was used to solicit information from 758 homeowners sampled from three cities in Ghana. The results showed that even though wood-based panels continue to enjoy strong patronage among home owners plastic-based panels appear to be the future material for ceiling. The findings suggest that, by 2030, homeowners in Ghana will use more plastic-based ceiling panels than wood-based panels, ceteris paribus. Attractiveness, durability and pleasantness are the key attributes of plastics that influence homeowners＇ decision to patronize the material. Additionally, the concern about the depletion of forest resources in Ghana has shaped homeowners decision to patronize plastic-based ceiling panels. While the shift to the use of plastic-based panels has the potential to moderate the consumption levels of timber and therefore could contribute to the conservation of tropical forests, it has a negative implication on the development of local wood processing industry. One area where manufacturers of wood products such as wood panels can explore in order to increase or maintain the market share of wood-based panel products is sourcing raw timber from certified forests.

加减散偏汤治疗育龄期妇女经前头痛临床疗效分析

本文主要对加减散偏汤治疗育龄期妇女经前头痛临床疗效进行分析与探讨。方法 选取2022.12-2023.7入我院治疗经前头痛的60育龄期妇女作为研究对象,患者入院后详细告知此次实验研究内容,引导患者自主加入两组,实验设置对照组与观察组,各组患者有30人,对照组行临床常规治疗,观察组行加减散偏汤治疗方式,通过对比两组患者治疗有效率情况、治疗后头疼发作程度、头痛持续时间情况及两组患者治疗生活质量情况,最终完成加减散偏汤治疗育龄期妇女经前头痛临床疗效探讨。结果 两组不同治疗方式下,治疗疗效方面,观察组有效性表现更为理想,其有效率为96.67%,(P<0.05);头疼发作程度、头痛持续时间指标明显优于对照组,(P<0.05);观察组患者治疗后生活质量更高,(P<0.05);结论 在治疗育龄期妇女经前头痛疾病过程中,采用加减散偏汤完成治疗,可提高患者治疗有效率,降低患者头疼发作程度及头痛持续时间,提高患者生活质量,提高患者心理健康、生理职能、躯体功能及社会功能情况,消除负面情绪,不影响患者日常生活,应大大推广应用。

A Parallel Algorithm for Adaptive Local Refinement of Tetrahedral Meshes Using Bisection

Local mesh refinement is one of the key steps in the implementations of adaptive finite element methods. This paper presents a parallel algorithm for distributed memory parallel computers for adaptive local refinement of tetrahedral meshes using bisection. This algorithm is used in PHG, Parallel Hierarchical Grid Chttp：//lsec. cc. ac. cn/phg/）, a toolbox under active development for parallel adaptive finite element solutions of partial differential equations. The algorithm proposed is characterized by allowing simukaneous refinement of submeshes to arbitrary levels before synchronization between submeshes and without the need of a central coordinator process for managing new vertices. Using the concept of canonical refinement, a simple proof of the independence of the resulting mesh on the mesh partitioning is given, which is useful in better understanding the behaviour of the biseetioning refinement procedure.

Modeling for Orientation Deviation of Workpiece and Analysis of Machining Accuracy

The machining accuracy of workpiece is influenced by its orientation deviation, which is caused by the fixture-workpiece error. Based on the spatial coordinate theory, the orientation deviation of workpiece is measured by using an on-machine verification system, which can take into account the errors resulting from fixture manufacturing, installation and adjustment, location and clamping of workpiece. According to the least square method, the model of orientation deviation is built to determine the relationship between the theoretical and actual coordinate systems. The influence of orientation deviation on machining accuracy is quantified, and it is shown that the orientation deviation only affects the dimensional precision and position precision, rather than shape precision. In the experiment, the compensation processing of realtime errors was conducted, and the perpendicularity and inclination errors of the tetragonal part were reduced by 38.46% and 47.06%, respectively.

Multiple dependent reliability estimation of large range MEMS accelerometers in high temperature environment

In the past,only one performance parameter was considered in the reliability estimation of micro-electro-mechanical system (MEMS) accelerometers,resulting in a one-sided reliability evaluation. Aiming at the failure condition of large range MEMS accelerometers in high temperature environment,the corresponding accelerated degradation test is designed. According to the degradation condition of zero bias and scale factor,multiple dependent reliability estimation of large range MEMS accelerometers is carried out. The results show that the multiple dependent reliability estimation of the large range MEMS accelerometers can improve the accuracy of the estimation and get more accurate results.

Investigation on high-volume fly ash pastes modified with micro-size metakaolin subjected to high temperatures

Portland cement(PC) containing high-volume fly ash(HVFA) is usually used to obtain economical and more sustainable merits, but these merits suffer from dramatically low compressive strength especially at early ages. In this work, the possibility of using micro-size metakaolin(MSK) particles to improve the compressive strength of HVFA paste before and after subjecting to high temperatures was studied. To produce HVFA paste, cement was partially substituted with 70% fly ash(FA), by weight. After that, FA was partially substituted with MSK at ratios fluctuating from 5% to 20% with an interval of 5%, by weight. The effect of MSK on the workability of HVFA mixture was measured. After curing, specimens were subjected to different high temperatures fluctuating from 400 to 1000 ℃ with an interval of 200 ℃ for 2 h. The results were analyzed by different techniques named X-ray diffraction(XRD), thermogravimetry(TGA) and scanning electron microscopy(SEM). The results showed that the incorporation of MSK particles into HVFA mixture exhibited a negative effect on the workability and a positive effect on the compressive strength before and after firing.