Interlocking Mechanism

The above discussion has tacitly assumed that it is only molecular interactions which lead to adhesion, and these have been assumed to occur across relatively smooth interfaces between materials in intimate contact. As described in typical textbooks, however, there are a number of disparate mechanisms that may be responsible for adhesion [9-11,32]. The list includes (1) the adsorption mechanism (2) the diffusion mechanism (3) the mechanical interlocking mechanism and (4) the electrostatic mechanism. These are pictured schematically in Fig. 6 and described briefly below, because the various semi-empirical prediction schemes apply differently depending on which mechanisms are relevant in a given case. Any given real case often entails a combination of mechanisms. 

Fig. 6. Four mechanisms of adhesion, (a) The adsorption mechanism (contact adhesion), (b) The diffusion mechanism (diffusion interphase adhesion), (c) The mechanical interlocking mechanism. (d) The electrostatic mechanism.

In particular, rotaxane dendrimers capable of reversible binding of ring and rod components, such as Type II, pseudorotaxane-terminated dendrimers, can be reversibly controlled by external stimuli, such as the solvent composition, temperature, and pH, to change their structure and properties. This has profound implications in diverse applications, for instance in the controlled drug release. A trapped guest molecule within a closed dendrimeric host system can be unleashed in a controlled manner by manipulating these external factors. In the type III-B rotaxane dendrimers, external stimuli can result in perturbations of the interlocked mechanical bonds. This behavior can be gainfully exploited to construct controlled molecular machines. 

Flash evaporation is another techniqne for the deposition of films whose constituents have different vapor pressures. Small quantities of the constituents in the desired ratio are continuously dropped at a predetermined rate from a vibration feeder into a sufficiently heated crucible or boat so that they are evaporated instantly. The temperature must be sufficiently high to evaporate the less volatile material. Figure 2.3 shows the flash-evaporation apparatus used to grow the different layers that compose a microbattery metallic contacts, cathode, electrolyte, lithium anode deposited under vacuum of 10-100 mPa pressure. This system has two vacuum chambers. Vacuum chamber A is devoted to evaporation of In-Se films while lithium and glass films are formed in chamber B. Two interlock mechanisms are used the first one transfers the grown In-Se film to the chamber B and the second interlock system is ntilized to carry lithium pieces from an inert-gas glove box to the evaporation boat. 

Particles with irregular fibrous shapes or plate-shaped forms can be mechanically interlocked. Mechanical interlocking is used to describe the hooking and twisting of the packed material. By the aid of vibration or pressure, they can reach mutual orientations in which they become physically bound. 

In high-pressure agglomeration, another interlocking mechanism may occur if a mixture of rigid and plastic materials is compacted. In this situation, the plastic component flows into recesses and, more generally, envelopes the exterior structure of harder particles, thus producing a strong structural bond that resembles the effect of a matrix binder (see also Section 8.1). 

Equipment passes and changing rooms should have an interlock mechanism or other appropriate system to prevent the opening of more than one door at a time. Changing rooms should be supplied with air filtered to the same standard as that for the work area, and extracts to produce an adequate air circulation independent of that of the work area. Equipment passes should normally be ventilated in the same way, but unventilated passes, or those equipped with supply air only, may be acceptable. 

Figure 14. The chain-like nature and interlocking mechanism of the monoclinic monazite structure illustrates the apical linking that forms the chains, shown in a stereo view. The large open circles represent phosphorous while the large solid circles represent the rare-earth ions. The small open circles represent oxygen (after Mullica et al. 1985a,b).

Some lifts use electrohydraulic actuators to hft and fold, with valves and gravity used to lower the lift. Crane lifts may swing out from a post at the front or rear of the side door. Interlocking mechanisms are available with some lifts to prevent the lift from being operated while the door is closed. The Society of Automotive Engineers (SAE) has developed guidelines for the testing of wheelchair lift devices for entry and exit from a personal vehicle. The standards are intended to set an acceptable level of reliability and performance for van hfts. 

Batt Term used to describe felts. They are nonwoven compressed fabrics, mats, and bats prepared from staple fibers without spinning, weaving, or knitting made up of fibers interlocked mechanically. 

Gray BL, Collins SD, Smith RL (2004) Interlocking mechanical and fluidic interconnections for microfluidic circuit boards. Sens Actuators A 112 18-24... 

Proving the Correctness of the Interlock Mechanism in Processor Design... 

The interlock mechanism of EP/3 uses both asynchronous and synchronous signals to control the components. This demonstrates that ITL is suitable for describing both synchronous circuits and asynchronous circuits. In (Cau and Zedan 1997) explicit constructs for both synchronous and asynchronous communication have been defined. 

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