36 research outputs found
Thermogravimetric and kinetic study of methylolmelamine phosphate treated – cotton fabric
Some salient properties of cotton cellulose which requires it to be treated with additives to improve its versatility were examined taken into consideration, the molecular structure. Thermogravimetric analysis of the cotton fabric and the treated cotton fabric were carried out in an improvised muffled furnace. The result was in accordance with the previous study carried out on cellulose showing two stages of thermal degradation with first degradation between 2500C – 3000C and estimated 75% weight loss. The treated fabrics show degradation at 2000C – 2500C with an estimated 10% - 25% weight loss and more stages of thermal degradation. This may be attributed to the structuralmodification of the cotton cellulose upon resination with methylolmelamine phosphate.Keywords: Cotton Fabric, Degradation, Resination, Thermogravimetri
Massive subgaleal haematoma in a 5 year old child – A case report
Subgaleal haematoma (SH) is a collection of blood between the bony skull and the loose connective tissue. It is almost a diagnosis confined to the neonatal age group with very few occurring beyond the age. Presentation could be sudden or chronic as deterioration in the cardio pulmonary status,shock, skin changes, airway obstruction and neurological sequealae.While assisted delivery with birth trauma are recognized causal factorsin the neonate, trauma to the head and blood related disorders have been reported to be major causes in older children and adults. Usually, the Small SH resolves spontaneously while the massive ones require active management; often with neuro surgical intervention. It also needs identifying the cause so as to treat and prevent a recurrence. We present a case of massive SH in a 5 year old mentally subnormal child with seizure disorder with a favourable outcome
Biological and Non-Biological Methods for Lignocellulosic Biomass Deconstruction
Owing to their abundance and cost-effectiveness, lignocellulosic materials have
attracted increasing attention in clean energy technologies over the last decade.
However, the complex polymer structure in these residues makes it difficult to extract
the fermentable sugars. Therefore, various pretreatment regimes have been used
resulting in the breaking of lignocelluloses’ physical and chemical structures, thereby
enhancing the availability of the polysaccharides which are subsequently hydrolysed
into different biocommodities. This chapter provides an evaluation of some of the latest
exploited methodologies that are used in the pretreatment of lignocellulosic materials.
Moreover, the chapter discusses the advantages and disadvantages of each method
Evaluation of Methods for the Analysis of Untreated and Processed Lignocellulosic Biomasses
The overall efficiency of the transformation of lignocellulosic materials to usable
products as chemicals and fuels must be governed by adequate analysis of products
before and after treatments. Using some promising technologies, lignocelluloses which
are biomasses from marine plant and trees, grains, food and non-food crops, and woodbased
can give products as fuel alcohol and other chemicals. Various methods of
transformation from feedstock to valuable end products are discussed in the scientific
literature. Therefore, yields must justify methods used for biomass transformations. As
a result, adequate compositional analysis of these processing stages is needed. In this
chapter, standard common methods such as gravimetric, chromatography,
spectroscopic and their variations for analysis on both untreated and treated
lignocelluloses are highlighted. The ease of the use and challenges with
recommendations to their applicability to quantifying lignocelluloses fractionations for
reproducibility and to be representative are discussed. With biomass technology,
virtually all and even more products that can be produced from fossil energy can also
be produced from biomass energy. Adequate analysis is therefore necessary
On The Theory Of Filtration At A Decreasing Rate
We investigate a one – dimensional filtration model based on [4]. The resulting equation, together with initial and boundary conditions were solved by analytical method. Various cases of the model were considered to obtain the concentration of impurities suspended in the liquid. Hence we employed the Laplace transform, asymptotic techniques, separation of variable to suite each of the cases to be considered. The result obtained, shows that filtration occurs at a decreasing rate in accordance with practical condition of filter use
Free Convective Flow of a Reacting Fluid between Vertical Porous Plates
This study investigates free convective flow between vertical porous plates. The energy and momentum equations which arise from the definitions of temperature and velocity are written in dimensionless forms. The resulting second order equations are solved to obtain expressions for the velocity, temperature, mass transfer skin friction, and rate of heat transfer.Keywords: Convective flow, reacting fluid, vertical porous plates