Full Text Available
Access Repository
Search Results - progress in (biomaterials OR materials)
Search alternatives:
- progress »
- Go to Previous Page
- Showing 21 - 22 results of 22
-
Construction and validation of socio-economic status scale
Published 2020Call Number: Loading…
Located: Loading…Article Loading… -
AN APPLICATION OF GOAL PROGRAMMING TO ACADEMIC RESOURCE ALLOCATION PLANNING
Published 1982-12Call Number: Loading…
Located: Loading…
Search Tools:
Refine Results
Page will reload when a filter is selected or excluded.- Corrosion resistance 2 results 2
- Environmental Management 2 results 2
- Environmental Sciences 2 results 2
- Validation 2 results 2
- development 2 results 2
- — — — — — Energy 2 results 2
- "This research work investigated the corrosion resistance of nickel plated low carbon steel in tomato fluid. It simulated the effect of continuous use of the material in a tomato environment where corrosion products are left in place. Low carbon steel samples were nickel electroplated at 4V for 20, 25, 30 and 35 mins using Watts solution.The plated samples were then subjected to tomato fluid environment for for 30 days. The electrode potentials mV (SCE) were measured every day. Weight loss was determined at intervals of 5 days for the duration of the exposure period. The result showed corrosion attack on the nickel- plated steel, the severity decreasing with the increasing weight of nickel coating on substrate. The result showed that thinly plated low carbon steel generally did not have any advantage over unplated steel. The pH of the tomato solution which initially was acidic was observed to progress to neutrality after 4 days and then became alkaline at the end of the thirty days test (because of corrosion product contamination of the tomato)contributing to the reduced corrosion rates in the plated samples after 10 days. Un-plated steel was found to be unsuitable for the fabrication of tomato processing machinery without some form of surface treatment - thick nickel plating is suitable as a protective coating in this environment. " 1 results 1
- "This research work investigated the corrosion resistance of nickel- plated medium carbon steel and 18/8 stainless steel in cassava fluid (i.e. containing hydrogen cyanide). It simulated the effect of continuous use of the materials in a cyanide environment where corrosion products are left in place. Low carbon steel sample was nickel electroplated at 4V for 35 minutes. The plated sample, the unplated and the 18/8 stainless steel were then subjected to a cassava fluid environment for thirty days. The electrode potentials, in mV (SCE), were measured every day. Weight loss was determined at intervals of 5 days for duration of the exposure period. The result showed little corrosion attack on the nickel-plated steel on the fifth and tenth days which quickly dropped to zero by the 15th day and remained at the passive state till the 20th day when corrosion picked up again increasing steadily, linearly until the end of the test day. Corrosion of the 18/8 stainless steel was very low as well decreasing till the last day of the test. The pH of the cassava solution which initially was acidic because of the cyanide content in the cassava was observed to progress to neutrality within five days and to alkalinity at the end of the thirty days test (because of corrosion product contamination of the cyanide). Un-plated steel was found to be unsuitable for the fabrication of cassava processing machinery because of the very high corrosion rate.18/8 stainless steel was found suitable for use in this environment. The renewed corrosion activity on nickel plated steel after the 20th day (pH=12) of continuous use in cyanide environment makes it unsuitable for use. " 1 results 1
- "This research work investigated the corrosion resistance of zinc plated 1018 steel in tomato fluid. It simulated the effect of continuous use of the material in a tomato environment where corrosion products are left in place. 1018 steel samples were zinc electroplated at voltages between 0.5V to 0.9V for 5 to 20minutes.The plated samples were then subjected to tomato fluid environment for 30 days. The electrode potentials mV (SCE) were measured every day. Weight loss was determined at intervals of 5 days for the duration of the exposure period.The result showed corrosion attack on the zinc- plated steel, the severity increasing with the increasing weight of zinc coating on substrate. The result showed that thinly plated 1018 steel generally did not have any advantage over unplated steel and were quickly stripped of their zinc plating with resultant corrosion of the underlying steel substrate. Heavily zinc-plating steel was observed to offer some form of protection for the plated steel.The pH of the tomato solution which initially was acidic was observed to progress to neutrality after 5 days and then became slightly alkaline at the end of the thirty days test (because of corrosion product contamination of the tomato) contributing to the reduced corrosion rates in the plated samples after 10 day. Zinc coating of 1018 steel was found to be unsuitable for the fabrication of tomato processing machinery in this environment. 1 results 1
- .roof maintenance, 1 results 1
- 18/8 stainless steel 1 results 1
- Accumulation of heavy metals in agricultural soils rcsults in long term environmental problem, elevateci heavy metal uptake by crops and food poisoning. Remediation of sites contaminateci by heavy metals is therefore pertinent. Incubation and greenhouse studies were conducted to test for thè effects of different types of compost on soil remediation and thè growth of maizc planted on rcmediated battery wastes contaminated soil. Composts made from five different plani materials (Soyabean stover (SS), Maize Stover (MS), Mexican Sunflower (SW), Cassava Wastes (CW) and Neem Seeds (MS) as well as Poultry Manure (PM) alone and Organo-mineral fertilizer (OM) were used. Each was applied at thè rate of 20 t/ha. Pre-cropping soil Chemical compositions showed that lead concentration (148000 mg/kg) was significantly higher than thè permissible level (300 mgkg1) at thè study site. Results of incubation studies revealed a progressive reduction in heavy metal concentrations for thè sampling periods. MSW and CW composts significantly reduced soil lead by 39% and 38% respectively followed by SS (33%), MS (28%), PM (26%), NS (25%) and OM (23%). Application of compost to thè contaminated soil also enhanced vegetative growth of maize when compared with control. SS, CW, NS, MS, MSW, OM, and PM increased thè dry matter yield by 49%, 60%, 56%, 24%, 68% , 55% and 27% respectively over control. Unlike thè maize plants grown on organic amendcd contaminated soil, control Dlants started showing toxicity symptoms such as necrotic lesions, chlorosis, wilting and eventual death. Organic imendment also increased nutrients uptake by maize crop compared to control plants. Generally organic amendments proved effective in remediation of heavy metal contaminated soil and had ameliorative effects on crop growing on contaminated soil. Among thè organic amendments, MSW and CW performed better. 1 results 1
- Achievement in Mathematics 1 results 1
- Africa 1 results 1
- African linguistics 1 results 1
- Assessment and testing 1 results 1
- Background: The African continent is behind by a wide margin in the childhood vaccination race which contributes significantly to the high childhood morbidity and mortality rate from vaccine-preventable diseases in the continent. Some African countries are still struggling to achieve routine immunization coverage for all recommended expanded program on immunization vaccines. Aim: In this study, we aimed to identify the barriers hindering childhood immunization in Africa and to identify the remarkable progress made so far. Materials and Methods: Peer-reviewed articles published in English that focused on the barriers to childhood immunization in Africa and the progress made so far was reviewed. This was achieved by searching relevant search terms in PubMed, Google Scholar, Wiley Online Library, and CINAHL databases dating back from January 2000 to June 2022. Result: A total of 30 papers were reviewed. The barriers include parents’ education status, economic status, and gender/age; place of birth and place of residence; cultural beliefs and religious affiliations; fear of contracting diseases and lack of trust in health public institutions; vaccine awareness and delivery; and dose-specific delays. The achievements include international support and oriented actions, plans for technological integration and its implementation, and domestic immunization-oriented actions and research work. Conclusion: Childhood immunization is still low in Africa with the majority of the countries yet to realize the global immunization targets. Technologies and immunization-related interventions have been implemented to support Africa but more concerted effort and aid are required to reduce vaccine-preventable deaths to the bare minimum. 1 results 1
- Background: The Global Commission for the Certification of the Eradication of Poliomyelitis will declare the world free of wild poliovirus transmission when no wild virus has been found in at least 3 consecutive years, and all laboratories possessing wild poliovirus materials have adopted appropriate measures of containment. Nigeria has made progress towards poliomyelitis eradication with the latest reported WPV type 1 on 21 Aug 2016 after 2 years without any case. This milestone achievement was followed by an inventory of biomedical laboratories completed in November 2015 with the destruction of all identified infectious materials. This paper seeks to describe the poliovirus laboratory containment process in Nigeria on which an effective containment system has been built to minimize the risk of virus re-introduction into the population from the laboratories. Methods: A national survey of all biomedical facilities, as well as an inventory of laboratories from various sectors, was conducted from June November 2015. National Task Force (NTF) members and staff working on polio administered an on-site questionnaire in each facility. Laboratory personnel were sensitized with all un-needed materials destroyed by autoclaving and incineration. All stakeholders were also sensitized to continue the destruction of such materials as a requirement for phase one activities. Results: A total of 20,638 biomedical facilities were surveyed with 9575 having laboratories. Thirty laboratories were found to contain poliovirus or potentially infectious materials. The 30 laboratories belonged to the ministries of health, education, defence and private organizations. Conclusions: This article is amongst the first in Africa that relates poliovirus laboratory containment in the context of the tOPV-bOPV switch in alignment with the Global Action Plan III. All identified infectious materials were destroyed and personnel trained to continue to destroy subsequent materials, a process that needs meticulous monitoring to mitigate the risk of poliovirus re-introduction to the population. 1 results 1
- Barriers 1 results 1
- Battery Wastes 1 results 1
- Bio-remediation 1 results 1
- Biosafety 1 results 1
- Cassava fluid 1 results 1
- Challenges (source: medical subheading‑NLM) 1 results 1
- Childhood 1 results 1
- Class size 1 results 1
- Cold-Drawn 1 results 1
- Compost 1 results 1
- Containment 1 results 1
- Deformation 1 results 1
- see all…