Tube Construction Research Articles

Aspects of deposit-feeding by the PolychaeteClymenella torquata

Abstract Clymenella torquata (Polychaeta: Maldanidae) traditionally is considered a sub-surface deposit-feeder. We report an undescribed behavior in which the worm uses its posterior segments to collect surface material. Sediment obtained in this manner can be used for tube construction or can be ingested. Laboratory experiments monitoring the effect of Clymenella on sub-surface bacteria suggest that the polychaete can stimulate their growth (‘gardening’). We propose that surface deposit-feeding helps to explain several aspects of the worm's biology (gut contents, dichromatism, and regeneration of posterior segments).

Construction of a neutron tube with a laser ion source

Construction of a neutron tube with a laser ion source

Design and Construction of Special Pressure-Guide Tube for Measurement of ROSA-III Core Inlet Flow Rate

Design and Construction of Special Pressure-Guide Tube for Measurement of ROSA-III Core Inlet Flow Rate

A new procedure for venting a reflectionless tube.

A reflectionless tube technique for estimating glottal waveforms has been described in the literature. Reflectionless tube construction has generally incorporated the insertion of a lateral vent to relieve air pressure which builds up within the tube during phonation. Data are provided which reveal that satisfactory relief of air pressure within the tube is not accomplished using lateral vent placement. A novel central venting procedure is described and is shown to provide satisfactory relief of air pressure build-up without disruption of the acoustic (anechoic) properties of the tube.

MUCILAGE TUBE MORPHOLOGY OF THREE TUBE‐DWELLING DIATOMS AND ITS DIAGNOSTIC VALUE1

ABSTRACTColonies of Berkeleya rutilans (Trent.) Grun., Navicula pseudocomoides Hendey and N. ramosissima (C. A. Ag.) Cleve were examined using light and electron microscopy to elucidate the structure of their mucilage tubes. Each species was found to have a characteristic tube construction which could be used for identification. A summary of features on which these species can be recognized was compiled.

Construction of a Drift Tube for Measurement of Ionic Transport Coefficients

Construction of a Drift Tube for Measurement of Ionic Transport Coefficients

Design and construction of special pressure-guide tube for measurement of ROSA-III core inlet flow rate.

Design and construction of special pressure-guide tube for measurement of ROSA-III core inlet flow rate.

CESIUM BEAM FREQUENCY STANDARD AT THE RADIO RESEARCH LABORATORIES

A laboratory type cesium beam frequency standard has been developing at the Radio Research Laboratories, Tokyo. Design consideration, some of the analysis and basic experiments have been made. The construction and performance of the beam tube and the electronics are mainly reported.

Arlberg expressway tunnel - Part 3. Construction of the Arlberg expressway tunnel tube : Tunn Tunnlg, V12, N5, June 1980, P45–50 John M.

Arlberg expressway tunnel - Part 3. Construction of the Arlberg expressway tunnel tube : Tunn Tunnlg, V12, N5, June 1980, P45–50 John M.

Arleberg expressway tunnel - Part 4. Construction of the Arlberg expressway tunnel tube : Tunn Tunnlg, V12, N6, July 1980, P66–68 John M.

Arleberg expressway tunnel - Part 4. Construction of the Arlberg expressway tunnel tube : Tunn Tunnlg, V12, N6, July 1980, P66–68 John M.

The 2-In Return-Beam Saticon: A High-Resolution Camera Tube

A 2-in (5.08-cm) photoconductive camera tube with a return-beam system has been constructed experimentally at the NHK Technical Research Laboratories for use as a high-resolution camera tube. High-resolution television surpasses the conventional system in producing wide-angle, fine-grained, high-resolution pictures, and the NHK Technical Research Laboratories have made considerable progress during the last few years on the basic investigation of the picture format, picture-quality standard, transmission system, and related fields. Needless to say, the high-resolution camera tube requires high resolving power in addition to a high S/N ratio to achieve good picture quality, high sensitivity, and low lag characteristics. The 2-in return-beam Saticon (RBS) tube introduced here is intended for use in imaging systems associated with ongoing research on high-resolution television systems. The basic investigations leading to a trial construction are explained briefly, and an outline is given of the construction and operation of the experimental camera tube. Measurement results and photographs of the displayed picture are also presented.

New endotracheal tube for laser surgery of the larynx.

The risk of combustion of endotracheal tubes during laser surgery of the larynx has been demonstrated. A new flexible metal endotracheal tube has been developed to obviate this risk. The laser beam is dispersed by the construction of the metal tube, thus assuring protection from both combustion and reflection.

Gastric Tube Interposition: A Satisfactory Alternative to the Colon for Esophageal Replacement in Children

The gastric tube was used as the primary method of esophageal reconstruction in 15 infants and children, 9 with isolated esophageal atresia and 6 with Iye stricture. The youngest patient was 8 months old and the oldest, 5 years old at the time of the procedure. The technique of gastric tube construction is described. There have been both major and minor complications but the gastric tube has proved very satisfactory as a conduit from mouth to stomach. Growth and development have been acceptable in all 15 children, although most remain in the lower percentiles for growth and height, a condition that usually predates the esophageal substitution. In our institution the gastric tube is the preferred method of esophageal substitution.

Mass culture ofTilapia zillii [Cichlidae] in pond ecosystems

The culture ofTilapia zillii (Gervais) in 18 and 34 cm deep, 5.5×7.6 m earthen ponds at 3 initial stocking densities, 6, 9 and 12 pairs, revealed an optimum 9 pair initial density for the maximum production of fry after 104 days. However, biomass increase was significantly greater at the 6 pair stocking density and in deeper ponds. Pond depth had no significant effect on size and weight gain of parental fish. Nest and brooding tube construction was variously influenced by pond depth and stocking density. Partial shading of ponds, while not affecting the maximum water temperature, did apparently reduce fish biomass production, the average length and weight of fry, and the average depth of nests. An estimated 1 million fish could be produced in 104 days from 190 similar ponds with a water surface equivalent to 0.8 hectares. This would be equivalent to ca. 725 kg fish biomass production and would require ca. 1,900 kg of catfish pellets or their equivalent. Possible ways to increase rearing efficiency are discussed.

Tube building by the amphipods Lembos websteri Bate and Corophium bonnellii Milne Edwards

Lembos websteri Bate and Corophium bonnellii Milne Edwards are tubicolous. The morphology of tubes collected from Laminaria holdfasts is described and contrasted with that of tubes built amongst filamentous algae in a wave-sheltered environment. In both species tube length is a function of animal length. Corophium build tubes with openings raised above the substratum more commonly than Lembos, and will construct mats of tubes away from solid surfaces; Lembos tend to build against solid surfaces. Tube construction appears to depend upon the ‘knitting’ activity of the first two pairs of peraeopods, utilizing a secretion containing acid and sulphated mucopolysaccharides. The process of tube construction on substrata of known granulometry and the morphology of tubes built in the laboratory are described. The burrowing capabilities of both species are compared. On sand, Lembos tend to build on the sediment surface, whilst Corophium tend to burrow into the substratum. Corophium begin tube building after transference to a new situation much sooner than Lembos, with female Lembos starting to build sooner than male Lembos, Corophium can build a covering tube in < 15 min. In the absence of extraneous material, both species line glass tubes with a meshwork of mucoid filaments. In empty dishes, mucoid tubes are rarely built. The ability of Lembos to colonize wave-exposed sites may be related to its preference for more sheltered spaces within kelp holdfasts.

Combined Collis-Nissen Reconstruction of the Esophagogastric Junction

Recent reports have indicated that combined Collis-Belsey reconstruction of the esophagogastric junction fails to control reflux in 30 to 46% of patients undergoing the procedure. The major factor thought to be responsible for this result is the limited Belsey fundoplication possible after construction of the gastroplasty tube. This report describes our technique of combining the Collis gastroplasty with a 360-degree Nissen type fundoplication. The radiographic and manometric characteristics of the distal esophageal high-pressure zone produced by the Collis-Nissen operation are discussed.

Inexpensive He-Ne laser tube construction

The construction and processing of a low power He-Ne laser tube is described. The tube uses the least expensive construction materials and is applicable to mass production fabrication methods. A cost analysis is presented.

Reactor Safety Channel System with on-Line Testing Capability

The LPTR (Livermore Pool Type Reactor) safety system had several undesirable features in the original equipment design (vintage 1956). A single trip bus, electron tube construction, and trip failure in the event of a shorted actuator magnet, are but some of the original equipment problems. The continued use of this equipment resulted in high maintenance costs, excessive actuator magnet replacement, difficult set-up procedures for the operations staff, and the requirement that the reactor be shut down to make safety level trip tests. The design approach used to solve these problems was to float the actuator power sources, use optical isolators for system interconnections, make use of multiple trip buses, and to provide simple test procedures. The resulting system incorporating the above techniques achieves a high level of channel integrity and reliability.

A New Approach to Shadow Mask Color Tube Construction

An objective was set at the very beginning of this project to develop a shadow mask color picture tube which would be less costly to produce. The tube could have no sacrifice in performance when compared to a present day shadow mask color tube. There were three main avenues pursued to attain this objective. One was to reduce the number of parts to produce the tube. The second was to reduce the cost of those parts, and the third was to reduce the cost of assembling and processing those parts into a finished product. The result was a system which has a totally new glass for the envelope of the tube, and a new shadow mask to integrate with that glass. The funnel, panel, and shadow mask were designed to fit a concept which would make them conducive to high speed and automatic assembly and process.

Construction of epithelialised tubes

The construction of an epithelialised tube from a buried split skin strip and the free transfer of the constructed tube are described in animal experiments.