* In the laboratory, a Büchner funnel is often used, with a filter paper serving as the porous barrier.

In February 2004 The Guardian reported that Yemeni opposition newspapers likened the barrier Saudi Arabia was building to the Israeli West Bank barrier, while The Independent headed an article with " Saudi Arabia, one of the most vocal critics in the Arab world of Israel's " security fence " in the West Bank, is quietly emulating the Israeli example by erecting a barrier along its porous border with Yemen ".

A simple example wherein two solutions — A and B — are separated by a porous barrier illustrates that diffusion will ensure that they will eventually mix into equal solutions.

If, however, the porous barrier is selective to which ions are let through, then diffusion alone will not determine the resulting solution.

It is relatively porous and is not considered to be a permeability barrier for small substrates.

* Separator ( electricity ), a porous or ion-conducting barrier used to separate anode and cathode in electrochemical systems, also known as diaphragm

Based on the principle that molecules of a lighter isotope would pass through a porous barrier more readily than molecules of a heavier one, gaseous diffusion of uranium hexafluoride produced a gas increasingly rich in uranium-235 as the heavier uranium-238 was separated out in a system of cascades.

One such a product is SepMate ™- 50, a specialized tube containing a porous insert that forms a physical barrier between the Ficoll-Paque and blood sample.

Other devices include a column containing a porous high-density polyethylene barrier or " frit.

The use of a porous barrier allows ions to pass through but keeps the solutions from mixing.

Sometime during the 1860s, a Frenchman by the name of Callaud invented a variant of the Daniell cell which dispensed with the porous barrier.

A porous disk or other porous barrier between the two half-cells may be used instead of a salt bridge ; however, they basically serve the same purpose.

Glass Moonshine slides are made of glass, but have a porous ceramic interior that helps prevent slipping ; other slides have been designed to reduce the weight of brass or porcelain slides by using a lightweight interior, while still others are made of glass on the front and of metal on the back to allow easy switching.

Terracotta, Terra cotta or Terra-cotta ( Italian: " baked earth ", from the Latin terra cotta ), a type of earthenware, is a clay-based unglazed or glazed ceramic, where the fired body is porous.

Some advances in DMFC have been: bringing down the fuel crossover, miniaturizing the cell for consumer and military products, ceramic plates, carbon nanotubes, porous silicon layers and oxidation reduction.

The ceramic anode layer must be very porous to allow the fuel to flow towards the electrolyte.

MCFCs are high-temperature fuel cells that use an electrolyte composed of a molten carbonate salt mixture suspended in a porous, chemically inert ceramic matrix of beta-alumina solid electrolyte ( BASE ).

In 1839, Grove developed a novel form of electric cell, the Grove cell, which used zinc and platinum electrodes exposed to two acids and separated by a porous ceramic pot.

The sensor element is a ceramic cylinder plated inside and out with porous platinum electrodes ; the whole assembly is protected by a metal gauze.

A porous point pen contains a point that is made of some porous material such as felt or ceramic.

Each solution has a corresponding metal strip in it, and a salt bridge or porous disk connecting the two solutions and allowing SO < sub > 4 </ sub >< sup > 2 −</ sup > ions to flow freely between the copper and zinc solutions.

The fabric of these crucibles is porous, probably designed to prevent a build up of pressure, and many have small holes in the lids which may be designed to release pressure or to add additional zinc minerals near the end of the process.

Impacts on porous surfaces, such as that of Hyperion, may produce internal compression without ejecta, punching a hole in the surface without filling in nearby craters.

For impacts into highly porous materials, a significant crater volume may also be formed by the permanent compaction of the pore space.

Water supplies from wells in karst topography may be unsafe, as the water may have run unimpeded from a sinkhole in a cattle pasture, through a cave and to the well, bypassing the normal filtering that occurs in a porous aquifer.

It is used for cutting non-rigid and porous material such as textiles, foam, or leather, that may be too difficult or impossible to cut with roll-fed plotters.

In a Middle Eastern country, where the roof may be used for recreation, it is often walled, and drainage holes must be provided to stop water from pooling and seeping through the porous roofing material.

Fritted glass is finely porous glass through which gas or liquid may pass.

The breakdown temperature of the zeolite material's porous structure may limit the maximum temperature that it may be heated to for regeneration.

Griddle surfaces are porous and the perimeter of the plate may have a small gap between the griddle plate and the splashes, so any cleaning agent used that is not food safe may contaminate food products placed on the plate after cleaning, resulting in sickness or injury.

The design may be made of porous materials, or be drilled with holes for decoration ; a low back or gaps can provide ventilation.

Its density was found to be very low ( around 1. 2 times the density of water ), indicating that the asteroid is porous to very porous ; from 25 % to as much as 60 % of it may be empty space, depending on the details of its composition.

In the last printing step, the porous monolith structure is overprinted with a liquid or polymer-gel electrolyte, dried, and then may be incorporated into various encapsulation or enclosures, depending on the application requirements.

Voids can have a dielectric constant of nearly 1, thus the dielectric constant of the porous material may be reduced by increasing the porosity of the film.

These serve to armour the shore and minimise erosion and may be either watertight or porous, which allows water to filter through after the wave energy has been dissipated.

Clinical studies on mammals have shown that porous metals, such as titanium foam, may allow the formation of vascular systems within the porous area.

Furthermore, iambic pentameter ( despite its name ) may be better described as a series of 10 positions than of 5 feet, especially since the sequence ××// may be interpreted as the swapping of ictic and non-ictic positions across feet, suggesting that if feet constitute any kind of boundary at all, it is a porous one indeed.

* Titanium dioxide ( TiO < small >< sub > 2 </ small ></ sub >) technology-nanoparticles of TiO < small >< sub > 2 </ small ></ sub >, together with calcium carbonate to neutralize any acidic gasses that may be adsorbed, is mixed into slightly porous paint.

On porous construction materials it may present a cosmetic problem only, but can sometimes indicate serious structural weakness.

These lateral shifts in deposition create alternating layers of good reservoir quality rock ( porous and permeable sands ) and poorer-quality mudstones ( capable of providing a reservoir " seal " to prevent the leakage of any accumulated hydrocarbons that may have migrated into the sandstones ).

Sintered porous metals should be usable in principle.

However, their use on engineered woods such as medium-density fiberboard can be problematic because of the porous nature of those surfaces.

As a gel, an agarose medium is porous and therefore can be used to measure microorganism motility and mobility.

I could exceedingly plainly perceive it to be all perforated and porous, much like a Honey-comb, but that the pores of it were not regular these pores, or cells, were indeed the first microscopical pores I ever saw, and perhaps, that were ever seen, for I had not met with any Writer or Person, that had made any mention of them before this.

To avoid mixing between the two electrolytes, the liquid junction can be provided through a porous plug that allows ion flow while reducing electrolyte mixing.

The revolutionary armies were formed by cacos, peasant brigands from the mountains of the north, along the porous Dominican border, who were enlisted by rival political factions with promises of money to be paid after a successful revolution and an opportunity to plunder.

Because the plateau of Jebel Akhdar is porous limestone, rainfall seeps quickly through it, and the vegetation, which might be expected to be more lush, is meager.

λ < sup >− 4 </ sup > Rayleigh-type scattering can also be exhibited by porous materials.

This porous glass body can be called a frit.

In the end, Amalthea's density was found to be as low as, so it must be either a relatively icy body or very porous " rubble pile " or, more likely, something in between.

Floats can be made of different materials, such as sheet brass soldered into a hollow shape, or of plastic ; hollow floats can spring small leaks and plastic floats can eventually become porous and lose their flotation ; in either case the float will fail to float, fuel level will be too high, and the engine will not run unless the float is replaced.

By choosing porous graphitic carbon as a stationary phase for liquid chromatography, even non derivatized glycans can be analyzed.

The local greenstone is a limestone that proved to be porous, prone to rapid deterioration when exposed to weather and a substandard building material.

The British returned during the War of 1812, setting up what turned out to be a porous blockade against American ships sailing to New York City.

Conversely if the plug is too hot, the porcelain will be porous looking, almost like sugar.

The porous texture allows wax to be retained within the structure of the base material, thus providing a more durable wax coating.