三水铝石的粉碎机械力化学效就与热特性

使用振动球磨机将三水铝石粉体进行干式微粉碎.粉碎实验条件为介质球/试样(质量比)=8.5.研究调查了不同粉碎时间处理粉碎试样的机械力化学效应(平均粒径、结晶无定形和加热特性).结果表明,长时间粉碎,达到粉碎平衡,平均粒径趋于极限值.粉碎过程中未脱水.由于粉碎,加热脱水温度、结晶相变温度降低.     

A Flux‐Modulating Synchronous Machine with Permanent Magnet Excitation

This paper presents a novel type of flux‐modulating synchronous machine (FMSM) in which permanent magnets (PMs) are embedded in the stator back‐iron. The rotor has neither windings nor PMs. A prototype machine with an outer‐rotor configuration was designed and manufactured to validate the operating principle of the FMSM. The characteristics in the motor mode of the prototype machine were also investigated with a vector control system. The results of the investigations show that, as in surface‐mounted PM motors, the torque of the FMSM is predominantly generated by the PM flux and can be controlled using the armature current.     

Capsule-Packed Freezing of Cooked Rice and Glutinous Rice Cakes

Cooked rice and commercial glutinous rice cakes were frozen by a capsule-packed freezing method we developed, then stored. Characteristics of samples frozen by this new method were compared with those of samples frozen in deep freezers (–20°C and –50°C), or chilled in an ordinary (5°C) or Cold Fog refrigerator (0°C). Texturometer measurements, glucoamylase digestion, and X-ray diffraction analysis of specimens thawed to room temperature indicated that the samples prepared by our new method were superior to those frozen in conventional freezers or chilled in refrigerators. Simulation experiments in a program freezer showed that rapid freezing and adequate tempering were characteristic of our capsule-packed method.     

Decentralized adaptive control of robotic manipulators†

We develop a self-tuning-type adaptive control for robotic manipulators with six joints, and analyse the stability of the control system. In order to reduce the computational effort for obtaining the control input in real time, a decentralized adaptive control system is designed in which each joint of the manipulator is regarded as a subsystem and controlled independently in parallel. In this control system we regard the interaction among the multiple joints as an unknown input in each subsystem. The influence of the interaction on the stability of the overall control system is analysed using a Lyapunov function. The theoretical result obtained is that the control system is always stable in the sense that the error between the output of the adaptive predictor and the real output (angular velocity of each joint) will not exceed the amount of interaction. This result is verified by some simulation studies.     

Determination of Mass Transport Mechanism of Rutile by Sinusoidal Profile Decay Method

Amplitude decay of sinusoidal surface profiles on the c surface of TiO₂ single crystals was measured in air over the range 1500 to 1700 K. The rate of decay was proportional to –2.75 powers of the sinusoidal wave length (4.3 to 17.6 μrn), indicating that volume diffusion is the dominant mass-transport mechanism. The effective volume diffusion coefficient, Deff , given agreed with tracer diffusion data for the Ti ion. Hence Deff was assumed to be equal to the self-diffusion coefficient of the Ti ion as oxygen ion transport along the surface was enhanced. No anisotropy was observed for transport on this surface.     

新型可见光固化树脂

针对一些过氧化物固化不能满足特殊的施工环境,以及紫外光固化存在对人体有害、应用范围窄、厚膜固化性不好等缺点,开发了1种利用可见光光源进行固化的变性乙烯基酯树脂(VLC树脂),通过测定其黏度、比重、酸价、力学性能、Tg、热变形温度、积层板在一定浓度的酸、碱、水、有机溶剂等介质里面的强度保持率,分别对树脂液态特性、树脂浇铸体及积层板的力学性能以及积层板的耐腐蚀性能进行了表征,通过与一般的过氧化物固化的乙烯基酯树脂的浇铸体及积层板性能比较,可以看出:可见光固化与常见的过氧化物固化相比,性能相当甚至更佳,并且可见光固化速度极快,苯乙烯挥发极少,作业简单,无须加促进剂和固化剂,无须繁琐的搅拌和脱泡过程,提高生产效率的同时,大幅度降低施工成本。     

Criterion for conditional stability of Ml MO integral control

A simple criterion to detect the conditional stability of MI MO systems with integral control is described, It is shown that a closed-loop system with a loop-transfer matrix H(s)/s is made unstable by undesirable feedback-gain reduction if any of the principal minors of [si - H(0)] have zeros in the left half-plane.     

A highly temperature-dependent Lamb-wave delay line,using PVF2

A PVF₂ Lamb Wave delay line is described. The transducer consists of o group of three electrodes on two surfaces of a thin film. The output voltage of the Lamb wave device is highly temperature-dependent.     

Kinetics of Hydration of Monocaldum Aluminate

Hydration of CaAl₂O₄ (CA) was studied by calorimetry, analysis of the liquid phase, measurement of the combined water, and electron microscopy. During the induction period, the solution remains almost unchanged and is equilibrated temporarily with both superficially intrusion-hydrated CA particles and Al(OH)₃ gel formed by dissociation of Al(OH)₄^– ions, the solubility of the Al(OH)₃ gel being 10^–4.24 molkg^–1 at 25°C, while the intrusion-hydrated layer on the CA particles grows following a nearly linear law to reach a critical thickness (∼3 nm at 10° to 20°C, or 12 nm at 30°C). At this point destruction of the layer occurs, nuclei of hydrous compounds are generated, and the induction period terminates. Subsequent reaction proceeds in accordance with the rate equation of Schiller based on the dissolution-crystallization mechanism.