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Why conservation fails: uncovering the wicked political nature of Southern Africa's fight against wildlife extinction by Mandy, Lindsay Gail
Published 2021Get full text
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Missionale ekklesiologie en ’n hermeneutiek van die Kerkreg? ’n Teologiese ondersoek in gesprek met Leo J. Koffeman na aanleiding van kerkregtelike diskoerse in die Nederduitse Ger... by Malherbe, Philippus Bernardus
Published 2025Get full text
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Practical reason and technology : a philosophical study by Baughan, Hugh Simpson
Published 2015Get full text
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Page will reload when a filter is selected or excluded.- Nigeria 5 results 5
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- Binary mixtures of microcrystalline cellulose MCC (A), and lactose (L) in ratios at 75:25, 50:50, and 25:75% respectively were prepared. The binary mixtures were subjected to microscopical analysis and density measurements. The mechanical properties of paracetamol tablets formulated with the above excipients were assessed for tensile strength, bonding capacity (using the Ryshkewitch-Duckworth relation) and friability, while drug release properties were assessed for disintegration and dissolution times. The dissolution profiles were fitted into dissolution model equations to determine release mechanism and similarity of release. Microscopic analysis showed that the lactose particles were large, crystalline, and acicular in shape whereas the MCC particles were smaller and irregularly shaped. The binary mixtures had particle shape and sizes in between the parent compounds. The particle size of A25:L75 however, was larger than that of the proprietary brand, Microcelac®. Bulk and tapped densities increased with increasing amounts of MCC in the binary mixtures while particle density had an inverse relationship. Tablets containing A75:L25 had the highest tensile strength and bonding capacity and lowest friability in comparison to other binary mixtures and Microcelac®. However, tablets containing A75:L25 did not show superiority to Microcelac® in terms of paracetamol release. Its release, however, followed the Korsmeyer-Peppas model indicating a super case II transport mechanism. Only comparisons of tablet combinations of Lactose: A25:L75 and MCC: A50:L50 had a similarity factor, f2 >50. Tablets made of A75:L25 exhibited the highest mechanical and release properties of the binary mixtures, as directly compressible excipient in comparison to the parent compounds and Microcelac®. This mixture, A75:L25 therefore, could be developed for commercial use in tablet formulations. 2 results 2
- Coronavirus 2 results 2
- Guidance counsellor 2 results 2
- Leadership 2 results 2
- Mental health 2 results 2
- Pandemic 2 results 2
- Secondary education 2 results 2
- Students with special needs 2 results 2
- The knowledge of whether secondary school counsellors envision themselves as leaders in the educational setting and the extent to which this perspective has been transformed to functional leadership practices is unclear. However, educators recognize the unique position occupied by guidance counsellors and the essential roles they play especially, in the education of persons with special needs. This study therefore, examined secondary schools counsellors’ perceptions of their leadership roles in the education of persons with special needs. It also investigated if any difference exists in secondary school counsellors’ perceptions of their leadership roles and some selected variables of age, gender, experience, or school status. The study adopted descriptive research, design. The sample of the study comprised (40) (that is, thirty-four (34) females and six (6) males), professional secondary school counsellors, from 40 (that is, 30 public and 10 private) secondary schools who are also members of the Lagos State Chapter of the counselling Association of Nigeria (CASSON). The respondents were selected using a stratified random sampling technique and purposive sampling. All respondents have some knowledge of special education. The respondents were purposively selected from four education districts of Lagos State out of six. Four hypotheses were formulated, while a self-developed questionnaire on counsellors’ perception, of their leadership roles was the main instrument for data collection. The data collected were analyzed using t-test. The results of the study indicated that respondents see themselves as leaders in the education sector irrespective of counsellors’ age, gender, years of experience and school status (public or private). Based on the findings, recommendations were made which include that guidance counsellors should engage in functional leadership practices in order to positively impact achievement of all students especially those with special needs. 2 results 2
- "Optimal allocation of products to downstream locations is a major requirement for minimizing the distribution costs associated with supply chain systems. Unfortunately many supply chain managers rely on their intuition and feelings to make these allocation decisions. In this study a mathematical model was developed for minimizing the distribution cost in a multi-product 2-echleon supply chain system. The distribution system of a leading bottling plant in Nigeria was studied to understand the underlying supply chain system . Attempt was made to identify system parameters, variables, limitations, criteria so as to be able to define the distribution problem The interactions and flow of products in the system were identified and characterized as a 2 echelon supply chain system. Mathematical model of the system was developed. The problem model, a linear program formulation with three major constraints; demand, availability and company policy requirements was parameterised based on demand data product availability data, company policies and unit transportation costs to various downstream locations. The model was solved for a 12 product 8 destination case. It was observed that the model application produces 6% reduction in the distribution cost compared to the existing practice of the company. It is concluded that the model is effective to reduce or minimize distribution expenses for any multiproduct multiple destination system and fulfilling demand at various destinations. " 1 results 1
- "Road bumps play a crucial role in enforcing speed limits, thereby preventing overspeeding of vehicles. It significantly contributes to the overall road safety objective through the prevention of accidents that lead to deaths of pedestrians and damage of vehicles. Despite the importance of road bumps, very little research has been done to investigate into their design. While documentation exists on quantitative descriptions of road bumps, they offer little guidance to decision making. This work presents a unique approach to solving road bumps design problems. The results of our study reveal three important road bumps variables that influence the control of vehicle speeds. The key variables are bump height, bump width, and effective distance between two consecutive road bumps. Since vehicle speed control is the ultimate aim of this study the relationship between vehicle speed and other variables earlier mentioned is established. Vehicle speed is defined as the product of frequency at which a vehicle is moving over road bumps and the sum of effective distance between two consecutive road bumps. In the determination of bump height we assume a conical shaped curve for analysis as a matter of research strategy. Based on this, two stages of motion were analysed The first concerns the motion over the bump itself while the second relates to the motion between two consecutive road bumps. Fourier series was then used to formulate a holistic equation that combines these two stages. used trigonometric functions to model the behaviour of the first stage while with the second stage giving a functional value of zero since no changes in height are observed. We carried out vibration analysis to determine the effect of road bumps on a vehicular system. Arising from this a model component is referred to as an isolation factor. This offers guidance to the safe frequency at which vehicles could travel over road bumps. The work appears to contribute to knowledge in road bump research through the development of a novel approach to the control of vehicle speeds. Significant research progress could be made if engineering and academic communities at large appreciate our viewpoints. With this work it is apparent that varying of the assumptions made in terms of bump shape may produce high proliferation of beneficial research studies. Although this work may reveal a new way of investigation into road bump research, no claim is made for the work comprehensiveness. We expect experts to challenge some of our thoughts and ideas presented in this work " 1 results 1
- "This work considered the unsteady state drainage of fluid from a vertical column of porous material of varying porosities in an attempt to verify variation of drawndawn surface with porosity and time using riverbed sand. Kerosene was used as the flowing fluid. Mathematical assumptions ware made in connection with Darcy's law. The result showed that the experiment which was designed from the theoretical framework agreed with the theory to a large extent, However, this is not in perfect agreement with an earlier experiment which was performed using well rounded beads in which glycerine was used as the flowing fluid. A FORTRAN program was written to study the variation theoretically and this was compared with the experimental result. There exists, a degree of discrepancy between theory and experiment indicating that, the mathematical formulations did not perfectly agree with the complex earth system as compared with the bead model that was initially used. There is a need for the modification of the mathematical formulations; nonetheless, an unsteady drawndown, pattern was attained with different porosity even in medium with very complex geometry. " 1 results 1
- A considerable fraction of sand in Niger Delta Area of Nigeria is contaminated with crude oil. The contaminated sand is largely utilised by local contractors for the production of concrete. However, there is need to establish its suitability in concreting. Previous works have centered on hardened uncontaminated concrete in crude oil environment but not on concrete made with Crude Oil Contaminated Sand (COCS). This research was designed to evaluate the effect of COCS on some engineering properties of fresh and hardened COCS concrete. Levels of crude oil contamination were determined using gravimetry method of Total Petroleum Hydrocarbon (TPH) test on nine sand samples randomly collected from some oil spill sites in Rivers State. Based on the test results, seven types of artificially contaminated sand were prepared with crude oil levels of 0.0, 2.5, 5.0, 10.0, 15.0, 20.0 and 25.0%. Workability (slump, compacting factor and flow), compressive strength, linear shrinkage, water absorption, and fire resistance were determined using concrete cubes, flexural strength using concrete beams, and surface resistivity using concrete cylinders in accordance with standard methods. Data obtained were analysed using ANOVA at p = 0.05. Eight models were developed using historic response surface methodology to predict the engineering properties of COCS concrete at water-cement ratio (w/c) of 0.5. Also, COCS concrete design mixes with contamination level and w/c ratio suitable for reinforced concrete were formulated. The TPH varied from 8.6 ± 0.2 to 14.1 ± 1.3%. The workability of concrete was improved by the presence of COCS. Slump, compacting factor and flow of the fresh concrete increased with increase in contamination from 30.0 to 200.0 mm, 0.5 to 0.9 and 15.0 to 85.0%, respectively. Compressive strength, flexural strength, linear shrinkage and water absorption of the hardened concrete reduced with levels of contamination from 31.5 ± 2.3 to 3.5 ± 0.0 N/mm2, 5.9 ± 0.8 to 0.1 ± 0.0 N/mm2, 0.1 ± 0.0 to 0.0 cm and 0.2 to 0.0 kg respectively. At a temperature of 200.0˚C, the percentage strength reduction increased from 18.4 to 94.8% for 2.5 to 25.0% contamination. Surface resistivity ranged from 25.1 ± 0.2 to 32.3 ± 0.2 kΩ-cm. The compressive and flexural strengths of COCS concrete were reduced by more than 50.0% at crude oil contamination level greater than 10.0%. The water absorption and surface resistivity values indicated that COCS concrete exhibited greater resistance to water and chloride penetration respectively, it shrank less when compared with the uncontaminated concrete, but exhibited poor fire resistance. Coefficient of determination, R2, of the models developed ranged from 0.823 to 0.999. Concrete design mix ratio of 1part of cement to1.6 part of COCS (10.0% crude oil) to 2.4 part of coarse aggregate was found to be appropriate at 0.45 w/c. This mix gave minimum compressive strength of 21.0 N/mm2 which is acceptable for reinforced concrete structures. Concretes produced with sand contaminated with less than ten percent crude oil were found suitable for use in low strength structures. Mix re-design using lower w/c improved the strength of the concrete. 1 results 1
- A grinding wheel is an expendable wheel which is made of very small, sharp and hard silicon carbide abrasive particles or grits held together by strong porous bond. This paper presents a study on some factors and parameters of silicon carbide abrasive grinding wheels which were developed and formulated from locally sourced raw materials in Nigeria. Six local raw material substitutes were identified through pilot study and a systematic search for an optimal formulation of silicon carbide was conducted using the Taguchi method. The produced silicon carbide abrasive grains were used to manufacture grinding wheels. Some of the grinding factors of locally manufacture grinding wheel include: wheel wear, wheel grinding ratio, wheel hardness, bond strength, size and grade of the manufactured silicon carbide abrasive grains. 1 results 1
- A preliminary study was made on the effects of castor oil on the properties of polyether based polyurethane foam such as rising time ,density, hardness tensile strength, compression ,elongation and heat ageing. The castor oil was introduced into the polyurethane foam by partially substituting it for silicone oil through seven experimental set up based on the laboratory mix formulation on 500g polyether based polyol with 0%, 20%, 40%, 50%, 60%, 80% and 100% castor oil substitutions .Incorporating castor oil significantly increased density from 21kg/m3 for foam without castor oil up to 25.73kg/m3 for 80% castor substitution and hardness index from 119kN up to 125kN. Improved compression set from 7.14% to 3.45 % was also noticed why tensile strength and elongation decreased with increased castor oil. Also heat ageing did not significantly affect the properties of the foam samples. The rising time of foam also increased with the increased castor oil. Clear cut conclusions on 100% substitution of castor oil could not be made as the experimental sample collapsed totally. 1 results 1
- A study has been made of the effects of pigeon pea starch obtained from the plant Cajanus cajan (L) Millisp. (family Fabaceae) and plantain starch obtained from the unripe fruit of Musa paradisiaca L. (family Musaceae) on the compressional, mechanical, and disintegration properties of paracetamol tablets in comparison with official corn starch BP. Analysis of compressional properties was done by using density measurements, and the Heckel and Kawakita equations, whereas the mechanical properties of the tablets were evaluated by using tensile strength (T-a measure of bond strength) and brittle fracture index (BFI-a measure of lamination tendency). The ranking for the mean yield pressure, Py, for the formulations containing the different starches was generally corn < pigeon pea < plantain starch while the ranking for Pk, an inverse measure of the amount of plasticity, was pigeon pea < plantain < corn starch, which indicated that formulations containing corn starch generally exhibited the fastest onset of plastic deformation, whereas those formulations containing pigeon pea starch exhibited the highest amount of plastic deformation during tableting. The tensile strength of the tablets increased with increase in concentration of the starches while the Brittle Fracture Index decreased. The ranking for T was pigeon pea > plantain > corn starch while the ranking for BFI was corn > plantain > pigeon pea starch. The bonding capacity of the formulations was in general agreement with the tensile strength results. The disintegration time (DT) of the formulation increased with concentration of plantain and corn starches but decreased with concentration of pigeon pea starch. The general ranking of DT values was plantain < pigeon pea < corn starch. Notably, formulations containing pigeon pea starch exhibited the highest bond strength and lowest brittleness, suggesting the usefulness of pigeon pea starch in producing strong tablets with minimal lamination tendency. Plantain starch, on the other hand, would be more useful where faster disintegration of tablet is desired. The results show that the starches could be useful in various formulations depending on the intended use of the tablets with the implication that the experimental starches can be developed for commercial purposes 1 results 1
- Abrasive materials are materials of extreme hardness that are used to shape other materials by a grinding or abrading action and they are used either as loose grains, as grinding wheels, or as coatings on cloth or paper. A grinding wheel is made of very small, sharp and hard silicon carbide abrasive particles or grits held together by strong porous bond. The manufacture of silicon carbide abrasives and grinding wheel in Nigeria has been severely impeded by the difficulty of identifying suitable local raw materials and the associated local formulation for abrasives and grinding wheel with global quality standards. This paper presents a study on the formulation and manufacture of abrasive grinding wheel using silicon carbide abrasive grains in Nigeria. Six local raw material substitutes were identified through pilot study and with the initial mix of the identified materials, a systematic search for an optimal formulation of silicon carbide, the intermediate product, was conducted using the Taguchi method. The mixture was fired in a furnace to 1800°C for 6 hours forming silicon carbide chunks, which were crushed and sieved into coarse and fine grades of abrasive grains. Combining each grade with appropriate proportion of latex binder to form paste in a compressed mould cavity of desired shape and size, coarse and fine grinding wheels of international standard were produced. 1 results 1
- Accessibility of records 1 results 1
- Administration of Justice 1 results 1
- Affecting 1 results 1
- Agronomic parameters 1 results 1
- An eight-week feeding trial was conducted to investigate the effect of 50% replacement of maize with grits prepared from three cassava varieties; TME 419, TMS 01/1371 and TMS 30572 as the major sources of energy oh the haematology and serum biochemistry of broilers. Four experimental diets were formulated in which cassava grits replaced maize at 0% for T I (control diet) and 50% of each treatments T2, T3 and T4 of TME 419, TMS 01/1371 and TMS 30572 cassava varieties, respectively. The replacements were same for Starter and finisher phases. One hundred and ninety-six day-old chicks of Abor acre strain were randomly allotted to four dietary treatments with seven replicates of seven birds per replicate in a completely randomized design. Haematology and serum biochemistry showed no significant differences (P > 0.05) at the end of the experiment. However, MCH, MCV and AST levels showed significant differences. Inclusion of grits made from whole roots of the three cassava varieties replaced 50% maize in broiler diets without detrimental effect on haematology and serum biochemistry. 1 results 1
- Antifungal 1 results 1
- Arabic sufi literature 1 results 1
- Archives Management 1 results 1
- Attitude 1 results 1
- Attitude. 1 results 1
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