Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: physical characteristic

Sortuj według:

Ogranicz wyniki do:

Geometrical Modeling of Woven Fabrics Weavability-Limit New Relationships

Dalal M., Drean J., Osselin J.

Autex Research Journal

2017

Vol. 17, no. 1

73--84

The weavability limit and tightness for 2D and 3D woven fabrics is an important factor and depends on many geometric parameters. Based on a comprehensive review of the literature on textile fabric construction and property, and related research on fabric geometry, a study of the weavability limit and tightness relationships of 2D and 3D woven fabrics was undertaken. Experiments were conducted on a representative number of polyester and cotton woven fabrics which have been woven in our workshop, using three machines endowed with different insertion systems (rapier, projectiles and air jet). Afterwards, these woven fabrics have been analyzed in the laboratory to determine their physical and mechanical characteristics using air permeability-meter and KES-F KAWABATA Evaluation System for Fabrics. In this study, the current Booten’s weavability limit and tightness relationships based on Ashenhurst’s, Peirce’s, Love’s, Russell’s, Galuszynskl’s theory and maximum-weavability is reviewed and modified as new relationships to expand their use to general cases (2D and 3D woven fabrics, all fiber materiel, all yarns etc…). The theoretical relationships were examined and found to agree with experimental results. It was concluded that the weavability limit and tightness relationships are useful tools for weavers in predicting whether a proposed fabric construction was weavable and also in predicting and explaining their physical and mechanical properties.

The physicochemical and microbiological properties of produced water associated with Nigerian oil operations

Aririatu L. E.

Studia Geotechnica et Mechanica

2002

Vol. 24, nr 3-4

65--70

Korzystając z odpowiednich standardowych metod, określono fizyczne, chemiczne i mikrobiologiczne właściwości wody pochodzącej z pięciu szybów naftowych w Nigerii. Otrzymane wyniki świadczą, że stężenie sodu w wodzie jest duże. Jest ono wyraźnie skorelowane z dużą zawartością substancji rozpuszczonych i dużym zasoleniem. Taka woda związana z nigeryjską ropą naftową charakteryzuje się niskim stężeniem jonów magnezowych, wapniowych i siarczanowych. Wysokie jej zasolenie powoduje korozję rur i innych konstrukcji rurowych w szybach naftowych. Analiza mikrobiologiczna wody z szybów wykazała obecność w niej przede wszystkim niepatogenicznych bakterii redukujących siarczany. Ponieważ woda związana z nigeryjską ropą naftową jest bogata w substancje rozpuszczone, sód i sól, może zanieczyszczać zarówno wodę, jak i glebę. Musi być więc usuwana w przemyślany sposób.

The physical, chemical and microbiological characteristics of produced water from five oil wells in the Eastern Niger Delta region of Nigeria were determined using standard methods for the examination of water and wastewaters. The results showed that the produced water contained high levels of sodium. The high sodium content correlated positively with high total dissolved solids and high salinity. Such a water associated with Nigerian crude oil had Iow concentrations of magnesium, calcium and sulphate ions. The high salinity caused corrosion of pipes and other oil well tubular structures. Microbial analysis of the produced water showed the presence of mostly nonpathogenic sulphate-reducing bacteria. Since produced waters associated with Nigerian crude oil contain appreciable quantities of dissolved solids, sodium and salt, they are capable of polluting fresh water and land, therefore must be disposed of in some acceptable manner.