Static dispense

Deposition of an excess volume of a solution onto the center of a substrate that might be held in a perfect horizontal position, either immobile (static dispense) or rotating at a relatively low speed (dynamic dispense). Other modes of deposition can be implemented [138]. 

Severe hydroprocessing required to produce ultra-low sulfur fuel removes most of the polar organic compounds from the fuel. The resulting product is virtually unable to effectively dissipate static charge as it builds in moving fuel. Instead, electrical discharge into pockets of gas within a pipeline or into air and vapors as fuel is being dispensed can occur. An explosion may result. Low levels of a fuel-soluble electrical conductivity improver to ultra-low sulfur fuel can help restore fuel electrical conductivity to safe levels. 

The static mercury drop electrode (SMDE) was first introduced commercially in the late 1970s by EG G Princeton Applied Research [27]. It utilizes a method of drop formation in which the mercury drop is dispensed rapidly and then allowed to hang stationary at the capillary tip. When used in a DME mode of operation, the drops can be repetitively formed and dislodged at desired time... 

CNG dispensing hose uses an impervious inner tube reinforced by a braided over-wrap of stainless steel wire. The inner tube can be teflon or a similar material that is not porous and will not become overly stiff in cold weather. An unusual problem that can occur with high-pressure hose is that if static electricity builds up inside the hose, it may discharge through the hose to the wire reinforcement. When this occurs, a small hole is formed in the inner tube that quickly leads to a leak through the wire reinforcement. Such incidents are rare, but they do occur, caused by the non-conducting properties of the inner tube. There have been no reported incidents of such failures in CNG dispensing hoses. 

Aspirate 5 pL of fresh elution solution and dispense once into the 0.6-mL polypropylene vial yielding 10 pL peptide solution to be analyzed either by MALDI-MS or static nanoESI-MS (see Note 8). 

It has been shown that static models of droplet splitting, protrusion, and dispensing all show a similar dependence on [t/8r(d/L)] [7]. As a result, curves for splitting and dispensing with N = 3 electrodes are plotted on the same axes in Fig. 4a, b for actuation in silicone oil and in air respectively. Also plotted is EWD actuator threshold voltage versus [t/8r(d/L)] for d/L = 1 and the optimum mixing condition. It can be seen that all of the important fluidic operations can be scaled. 

In summary, it has been shown that static models of droplet splitting and liquid dispensing all show a similar dependence on [t/Sr(d/L)] . Scaling reduces the amount of linear displacement to dispense a droplet. Thus, the model shows that as long as t/8r(d/L) is held constant while L is decreased, the same number of dispensing electrodes required is fixed for constant (V - Therefore, scaling to smaller droplet volumes is favorable... 

An original version of the static method was proposed by Luskina et al. [48], using a simple instrument. Sample compounds were oxidized in a sealed tube in the presence of copper oxide at a residual pressure of lOmmHg. This method of combustion helps to eliminate the disadvantages inherent in the conventional methods of oxidation, namely, the admission of unburned products into the analysis zone and flammability and explosion hazards. All of the combustion products were forced by a flow of helium from the combustion tube into the chromatographic column where separation took place thus the method makes it possible to dispense with special sampling devices. The separation of water from carbon dioxide was effected in a flow of helium in a column of tricresyl phosphate (0.6 m x 3 mm I.D.). 

Figure 22 Schematic diagram of apparatus to determine the corrosivity of fire gases in a static exposure chamber (ISO 1197 2). 1. Ignition source. 2. Test specimen dispenser. 3. Corrosion detector. 4. Thermocouple. 5. Heater.

The valves are based on the company s Micro-Kiss No-Drip valve body design for low-flow fluid control using bayonet-style static mixers. The No-Drip design feature integrates carbide ball-end needles with carbide seats for long life dispensing of viscous and abrasive materials. 

Electrowetting, Applications, Fig. 4 Drop dispensing or metering from a reservoir using static electrowetting schemes (From Ref. [9])... 

As demonstrated in Fig. 7, which shows the results for a pipette checked using the gravimetric method, the coefficient of variation (CV, defined as the ratio of the standard deviation to the mean) for a run consisting of ten measurements of a given volume increases considerably when the dispensed liquid volumes are less than 5 pi. Evaporation, buoyancy, vibration, and the effects of static electricity are the primary causes of these results. A possible alternative method to determine microscale droplet volumes is one based on measurement of the concentration of a liquid solution. Two practices, also recommended by the ISO standard [5], are commoifly used, namely, the photometric and titrimetric methods. 

Bonding— The interconnection of two objects such as a tank or cylinder with clamps and wire as a safety practice to equalize the electrical potential between the objects and help prevent static sparks that could ignite flammable materials, dispensing/receiving a flammable liquid that requires dissipating the static charge by bonding between containers. 

Static pinch valve The feed tube from the product tank passes underneath the pneumatic pinch cylinder. When the valve is closed, the pneumatic cylinder closes the tube. When the cylinder opens, the product flows through the tube to the dispenser nozzle. 

A static pinch valve can be mounted on a bench station, or alternatively, on an automatic line. A typical bench application would be bonding the ends of a rubber extrusion to make up car door seals. In the case of an automatic line, a free-fall drop could be dispensed on to a component part located beneath the static pinch valve or, alternatively, a bead applied to a component part as it traverses beneath the pinch valve nozzle. 

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