Mesh basket

Water strainers are of the cleanahle type, either a single-mesh basket, which must he removed after isolating the water flow, or a twin construction which permits the cleaning of one while the other is working. Indication of a dirty strainer will he an increase in pump pressure, and it is essential to have a pressure gauge on the pump discharge. 

We use gel content analysis to determine the weight fraction of a crosslinked polymer that is bound into an insoluble network. We immerse a stainless steel mesh basket containing a known weight of the crosslinked polymer in a suitable solvent (which may be heated to facilitate dissolution). If necessary, we can slice or grind the sample to increase its surface area. After 24 hours or more, we remove the basket from the solvent and dry it to constant weight. We calculate the gel content from Eq. 5.6. 

A part of the subsample was spread by hand from the plastic bag into the No. 50 mesh basket, 29.5 cm wide by 10 cm high by 90.8 cm long. The basket was weighed and placed on the trolley. The fuel bed was lit by first dosing the leading edge of the bed with 40 cm of the methylated alcohol. The trolley was allowed to remain stationary for thirty seconds and the flame front usually took three minutes to reach steady state. The speed of the trolley was then controlled to keep the flame in a stationary position over the duct. A constant burning rate was usually maintained for 60 cm of travel. 

Color Plate 12 Formation of Diffusion Layer During Electrolysis (Box 17-3) (a) Cu electrode (flat plate, left) and Pt electrode (mesh basket, right) immersed in solution containing KI and starch, with no electric current, (b) Starch-iodine complex forms at surface of Pt anode when current flows. 

The gas dispersion tube technique is much easier to assemble and use than the dialysis membrane/wire mesh basket assembly, but it gives similar release profiles for 5-FU from EHCF or copolymers of EHCF with either HA or HHA. The gas dispersion tube method only requires 0.1 gram of material for an accurate kinetic profile of these prodrugs. The small gas dispersion tubes are useful for studies involving powders, but pellets would not fit into these tubes. The large size gas dispersion tubes or the wire basket technique could be used for powders or pellets, and can accommodate larger sample sizes. In summary the gas dispersion tube technique is reproducible, easy to assemble, easy to use, can distinguish polymers with different release rates, and the results can be correlated with our earlier studies. 

The EHCF copolymers studied showed zero-order release kinetics in this simplified procedure and showed identical release profiles as in our earlier study (1 ) using the more complex dialysis membrane/ stainless steel mesh basket technique. The actual 5-FU release rates increased in the co-monomer order HHA>HA>BA. Within a given set of copolymers, the release rate for 5-FU increased as the EHCF content increased. 

FIGURE 12 Various drag dissolution methodologies, (a) In the paddle method, the tablet is placed in the dissolution vessel containing dissolution medium and the paddle is rotated at defined rpm, while the dissolution vessel is maintained at body temperature, (b) In the basket method, the tablet is kept inside a meshed basket and rotated, (c) For IDR studies, the tablet is kept inside a die cavity and only one face of the tablet is exposed to the dissolution medium. 

A gravimetric reactor was used in these experiments which consisted of an upflow vertical stainless steel reactor with catalyat contained in a gold wire mesh basket suspended from an overhead electronic balance. Isolation of the balance chamber is maintained by a downflow purge of an inert gas which exits with product gases above the catalyst basket. Experimental details of this unit have been given previously (ref. 1). 

The apparatus in Figure 38-2, p. 452, employing two vessels, is capable of produeing gradients from 0.8 to 2.7 g/ctff, to 0.0001 g/cm requiring 2 to 4 hours. The jacket operates from below ambient to 85°C. It contains a mesh basket that can be raised or lowered at 2 cm/min to dispense and retrieve density beads or samples. 

The procedure involves placing a solid salt in a Pt (platinum) beaker and bringing it up to the required temperature. The salt crystals liquefy and the SiC sample to be etched is placed in a Pt mesh basket and is then lowered into the molten salt for the required time. All of the molten salts to be used for this procedure need oxygen for etching [1]. The oxygen can be supplied by the molten salt, as in the case of KOH, or by the surrounding atmosphere. The following molten salts have been used to etch SiC and reveal various surface features ... 

The thermobalance is an apparatus capable of continuously weighing a coal sample which is undergoing reaction in a gaseous environment of desired composition at a constant pressure. The temperature can be kept constant or varied (10°F/min is the maximum rate for the apparatus used at IGT). The nature of gas-solid contact with the apparatus used in this study is shown in Figure 1. The coal sample is contained in the annular space of a wire mesh basket bounded on the inside by a hollow, stainless steel tube and on the outside by a wire mesh screen. To facilitate mass and heat transfer between the bed and its environment, the thickness of the bed is only 2-3 particle diameters when using —20+40 US sieve-size particles. Gas flow rates used with this system are sufficiently... 

In a typical test the wire mesh basket is initially in an upper, cooled portion of the reactor in which a downward, inert gas flow is maintained. During this time the desired temperature and pressure conditions are established in a lower, heated portion of the reactor in the presence of a flowing gas. A test is initiated by lowering the basket into the heated reaction zone, a procedure which takes 5-6 sec. Theoretical computation shows that about 2 min are needed for the sample to achieve reactor temperature as measured by several thermocouples surrounding the basket in the reaction zone. This computation is reasonably corroborated by various kinetic indications and by the behavior of the thermocouples in re-attaining their preset temperatures. The sample is kept in the heated portion of the reactor for the specified time while its weight is continuously recorded. The test is terminated by raising the basket back to the upper, cooled portion of the reactor. 

Catalysts were characterised by cyclic voltammetry using a two compartment electrochemical cell. The working electrode consisted of a Pt-mesh basket containing... 

Pond life is adapted to native plants, so include a variety of these, as well as any exotics you might like. (Some non-native plants can be difficult to eradicate once they get established, and choke up ponds and rivers, so be careful what you plant.) introduce rooted plants in mesh baskets and cover the soil or compost in the basket with gravel to prevent it washing away. 

In the case of continuous operation, a series of kettles may be employed. A more preferable method of operation is the use of packed towers or columns constructed of steel or stainless steel. The thickness of the wall will depend on the pressures required for the particular reduction conditions being used. The size will depend upon the production volumes required. The towers may be packed with catalyst, generally on a support for ease of handling and greater surface, in random fashion, on trays, in wire-mesh baskets, or alternately with wire-mesh entrainment packing. Fluid-bed systems have also been employed. 

The method best suited to the home cultivator is the hot water bath. Figure 111 illustrates a simple system utilizing a 55 gallon drum and a propane burner. The drum is half filled with water that is then heated to 160-170°F. Chopped dry straw is placed into the wire mesh basket and submerged in the hot water. (A weight is needed to keep The straw underwater.) After 30-45 minutes the straw is removed from the water and allowed to drain. It is very important to let all loose water run off. 

It is essential to use several small pieces from any sample of material in order to check for consistency, particularly since it may be difficult to see small bubbles attached to such a piece. It is also essential that the column be kept within a transparent constant-temperature bath, because the densities both of the liquid and of the polymer samples are highly temperature-dependent. Once the measurements have been made, the pieces of polymer or the floats are removed from the column very slowly by means of a small wire-mesh basket. This can be done without causing significant disturbance of the density gradient. 

Treatment 1 (substrate-only) was used as a baseline to test whether the snakes could use mouse-deposited substrate odors to relocate prey post-strike. To create substrate trails following the strike, the struck mouse was slid in one continuous motion, ventral surface down, along the base of the maze and out one of the two arms. The mouse was then removed from the maze so as not to present visual cues to the snake. Treatment 2 (airborne-only) presented snakes with airborne odors from struck mice to test whether snakes could relocate prey using only airborne information. To provide airborne cues, the struck mouse was placed in a wire-mesh basket, and that basket was placed on the intake side of one of the fans. The arm containing the odor was alternated fixrm one trial to the next. Treatment 3 (substrate vs. airborne) presented snakes with both substrate and airborne cues from struck mice to determine if there was a preference for one cue over the other. To present both substrate and airborne cues in concert, the substrate trail was deposited along the base and out one arm as in Treatment 1, and then the same struck mouse was placed in a wire-mesh basket on the intake side of the fan of the opposite arm. 

Animals were tested by placing them under an inverted wire mesh basket upwind from the fan and released when the basket was raised by a pulley. Groups of animals were tested. Group size varied with the species being tested. Different species were tested for different durations. For example, some species were tested for 10 min, whereas several tree frog species (e.g., Hyla chrysoscelis and Pseudacris clarki) were tested for at least 20 min. The testing times were arbitrarily set but were consistent within species. 

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