Bubble formation at two adjacent submerged orifices in inviscid fluids

A theoretical model has been developed as an extension of single orifice bubble formation to investigate the growth and detachment of vapor/gas bubbles formed at two adjacent submerged orifices in inviscid fluids. The mathematical model treats the two bubbles as an expanding control volume moving to the line of centers above a wall. The movement of the bubbles is obtained by application of force balance acting on the bubble and accounts for surface tension, buoyancy, steam momentum and liquid inertia effects. The liquid inertia effects are determined by applying inviscid and irrotational flow assumptions to allow potential flow theory to calculate the liquid velocity field which then allows the pressure distribution to be calculated. The model is extended to include the mass and energy equations to model the steam bubble formation in sub-cooled water. The theoretical results are compared with the available experimental data of bubble formation during constant mass flow steam bubble formation at two submerged upward facing orifices in sub-cooled water. The model was validated by available experimental data for the growth and detachment processes of two adjacent 1 mm orifices at system pressures of 2 and 3 bars, flow rates of 1.2-4 g/min at sub-cooling of 3.5-35 ºC. The comparisons of theory and experiments indicate that the model successfully predicts the bubbles growth and detachment for the range of conditions studied

Effects of Heat Treatment of Ultrafiltered Milk on its Rennet Coagulation Time and on Whey Protein Denaturation

The purpose of this research was to determine the effects of heating (including heating to ultra-high temperatures) homogenized ultrafiltered whole and skim milks on whey protein denaturation and milk\u27s subsequent rennet coagulation properties: coagulation time, curd firmness, and microstructure. Whole and skim milk samples were ultrafiltered using a spiral wound ultrafiltration membrane system. Samples were preheated to 72°C for 58 s, held for 8 s then heated to 72, 89, 106, 123, or 140°C for more than 97 sand held for 4 s. The milk was then cooled to 60°C and homogenized, further cooled to 30°C, packaged into 120 ml sterile containers, and refrigerated overnight. Rennet coagulation time and curd firmness were monitored using a Formagraph . Milk and gel samples were fixed in 2.5% glutaraldehyde solution and examined by electron microscopy. Whey protein denaturation was determined by precipitating casein at pH 4.6 with .lN HCl and measuring protein content in the filtrate by the Kjeldahl procedure. Rennet coagulation time of milk increased as processing temperature was increased. Gel strength decreased with an increase in processing temperature. Ultrafiltration shortened rennet coagulation time and increased gel firmness. Ultra-high- temperature- heated whole and skim milks did not coagulate upon addition of rennet, but their concentrated counterparts did. Rennet coagulation of the concentrated milks was delayed by heating. Samples treated with ultra-high-temperature formed only a weak gel. The casein micelles in milk increased in size as a function of increasing processing temperature and concentration by ultrafiltration. Additional protein material adhered to the casein micelles after high-temperature processing and was especially noticeable in the samples treated with ultra-high-temperature. Whey protein denaturation increased as a function of increased heating temperature. The heated concentrated milks had higher levels of protein denaturation than the heated unconcentrated ones

Trends in Technical Progress in India .Analysis of Input-Output Tables from 1968 to 2003

The paper is based on the 8 Input . Output (I-O) tables for the Indian economy available over a period of 36 years from 1968-69 to 2003-04. The technical progress (TP) in the context of the I-O tables is based on the concept of a production function defining the relationship between gross output and material inputs as well as value added at the disaggregated sectoral level. The paper attempts to answer the following questions: (i) Was the TP substantial and continuous throughout the period?; (ii) Was the rate of TP during the inward looking and outward looking growth strategy phases of the economy the same?; and (iii) Was the rate of TP at the disaggregated sectoral level almost constant over time? In order to measure the rate of TP, the available eight national I-O tables in India are first made compatible for the number, scope and definitions of sectors as well as for prices by converting them at constant 1993-94 prices. Chenery-Watanabe coefficient is used for measuring the rate of TP for different sectors across the 8 I-O tables.

Ranolazine improves glucose and lipid homoestasis in streptozotocin induced diabetes mellitus in albino wistar rats

Background: Type 2 diabetes mellitus is one of the most common metabolic disorders at present with increasing incidence worldwide. The disease progresses with eventual multi-system involvement such as adverse cardiovascular outcomes. This necessitates pharmacotherapy which is able to retard disease progression, have a favourable cardiovascular profile in addition to stabilisation of glucose homeostasis. Ranolazine is an anti-anginal drug, which has been shown to reduce HbA1c in patients with CAD and diabetes in various clinical trials.Methods: Albino wistar rats of either sex weighing 150-200 grams, bred in central animal facility of JSS Medical College were used for the study. The animals were randomly divided into three groups of six animals each. Diabetes was induced in all 3 groups of animals by injecting streptozotocin in a dose of 45 mg/kg. After 72 hours of STZ administration, rats with blood glucose levels greater than 250 mg/dl were selected for the study. Capillary blood glucose levels were measured on 0, 7th, 14th, 21st, 28th days. Blood lipid levels were measured at baseline and day 28.Results: There was a persistent decrease in plasma glucose levels in the ranolazine treated animals during the study. Fasting plasma glucose levels were significantly lower in the ranolazine-treated group (206.3+12.74 mg/dl) compared with the vehicle group (437.8+34.03mg/dl) at 4 weeks. Ranolazine had a favourable effect on lipid profile when compared to the control (vehicle treated) animals.Conclusions: Ranolazine improved glucose and lipid homeostasis in streptozotocin induced diabetic wistar rats. Further studies are needed to validate the findings and elucidate the exact mechanism

Massive Dirac fermions and the zero field quantum Hall effect

Through an explicit calculation for a Lagrangian in quantum electrodynamics in (2+1)-space--time dimensions (QED$_3$), making use of the relativistic Kubo formula, we demonstrate that the filling factor accompanying the quantized electrical conductivity for massive Dirac fermions of a single species in two spatial dimensions is a half (in natural units) when time reversal and parity symmetries of the Lagrangian are explicitly broken by the fermion mass term. We then discuss the most general form of the QED$_3$ Lagrangian, both for irreducible and reducible representations of the Dirac matrices in the plane, with emphasis on the appearance of a Chern-Simons term. We also identify the value of the filling factor with a zero field quantum Hall effect (QHE).Comment: 15 pages. Accepted in Jour. Phys.

Invariant Variational Problems

This research is the study of conservation laws using Lie algebra of the symmetry Lie group. In particular, we consider conservation laws for invariant variational problems based on Noether theorem. We have provided a formula of conservation laws in terms of the Lie algebra of symmetry Lie group. &nbsp

Labour and Labour Crisis in Nigerian: The Implication of the Structural Adjustment Programme

This Paper Labour and Labour Crises in Nigeria: The implication of structural adjustment programme, its aims at analyzing the effects of the structural adjustment programme (SAP) on the Labour and Labour crises in Nigeria. Through the economic policy programme, which among other objectives of the programmes includes, the privatization of public investment, retrenchment of Staffs, devaluation of the naira, deregulation of interest rates, reduction on government expenditure and Labour market adjustment. This paper also examine the Nigerian economy before the introduction of the Structural adjustment programme (SAP) which also give an insight about the Nigerian drawing rights from 1970 where the 90 percent of the nation foreign exchange earnings and more than 80 percent of the country’s population (53 million) were gaily employed by the agricultural sector. However, with discovery of Oil in the 70s Agricultural contribution to GDP started to decline from about 40 percent, GDP in the early 1970s to 20 percentage in the early 1980s. This decline resulted into untold sequences such as increased dependence on food imports. Now the government source of income solidly depend on Oil with 90 percent of the country exports earnings. As such revenue fell from $27.4 billion in 1950 to$ 11.1 billion in 1982. In the same vein, external reserve dropped from $757 billion to$5.5 billion. These effects resulted into external debt and massive borrowing. In order to find a solution to the problems the government decided to adopt the Structural adjustment programme so that it will dealth with the economic problems as at that time. This also brought about the idea of shifting the resources from undesired sector to more desire ones. Labour in particular is required to shift accordingly from Urban to Rural areas. Government intends to pursue this by applying relative price instrument like devaluation, freeing of urban wages and removal of subsidy. But unfortunately, this result was could not be achieved because of implicit model in pursuing the said objective is defective in many ways. The consequence of these leads to retrenchment of workers where this is not possible, workers were denied their basic pay for months, the Nigeria wage earner was left to fend foe his survival in order to sustain his life and those of his dependents. As such this leads to strike and counter strike which the Labour Union sought to be the only means of obtaining Union rights. Even though this was not effective, since the industries can not affords the exchange rate for their raw materials etc

In vitro propagation of some promising genotypes of jojoba (Simmondsia chinensis)

Nodal segments (1.5 - 3.0 cm long) of six promising jojoba genotypes were cultured in vitro on solidified MS medium supplemented with BA in combination with different concentrations of NAA, IAA or IBA forshoot formation. The plant growth regulators combination of 5.55 ìM BA + 7.1 ìM IAA proved the best for shoot initiation and subsequent growth. Some explants of the jojoba genotypes, PKJ-3 and PKJ-6,developed thick rootlets when BA (5.55 ìM) was used in combination with IBA (6.1 ìM) or NAA (6.7 ìM). Many explants developed callus on the medium containing BA (11.1 ìM) in combination with NAA (13.4ìM), IAA (14.3 ìM) or IBA (12.2 ìM). In vitro derived shoots were rooted by culturing on solidified MS medium containing IBA (6.1 ìM), IAA (7.1 ìM) or NAA (6.7 ìM). The plantlets which developed roots inresponse to IBA had the maximum survival percentage (63.33) during acclimatization in greenhouse. However, survival of the plantlets in field conditions was independent of the genotypes and the time ofplanting. Among the genotypes, PKJ-3 performed the best in all the parameters studied

Evaluation of immune status in patients with breast cancer in Sokoto, Northwestern, Nigeria

Background: Breast cancer is a major public health problem especially in Sub-Saharan Africa, Nigeria inclusive. It is a leading cause of cancer- related deaths worldwide. The present study assessed the immune status of breast cancer patients using CD4+ T cell count, CD8+ T cell count, CD4+/CD8+ ratio and some leucocytes.Methods: A total of sixty nine (69) subjects that comprised of forty six (46) breast cancer patients attending the Breast Clinic of Usmanu Danfodiyo University Teaching Hospital, Sokoto and twenty three (23) age- and gender-marched apparently healthy individuals as controls were included in the study.Results: The CD4+ T cells (cell/ μl) and CD8+ T cells (cell/ μl) were enumerated using Flow Cytometric method, while CD4/CD8 ratio was calculated from the values obtained from the CD4+ T cells and CD8+ T cells. Even though, there were no significant differences in CD4+ T cells, CD8+ T cells and CD4+/CD8+ ratio based on breast cancer stages and therapy types.Conclusions: It is hereby concluded that, the monocyte counts and CD4+/CD8+ ratio were higher in breast cancer patients and this could be used to differentiate the breast cancer patients from the normal control subjects