检索结果-南通市图书馆

A Comparative Study on the Flexural Behaviour of Waffle and Solid Slab Models When Subjected to Point Load

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Civil Engineering and Architecture 2014年第5期8卷 588-594页

作者： Akinyele J. Olawale Alade G. ayodele Department of Civil Engineering Federal University of Agriculture Abeokuta 039 Nigeria Department of Civil Engineering Osun State University Osogbo 022 Nigeria

The determinations of flexural behavior of some engineering structures are based on different theories and equations, but it has been observed that some of these equations may not give true representation. This work has looked into the difference that may occur between theoretical and experimental results. An experimental test carried out on models of waffle and solid slabs structures were described and results from twenty test samples are presented. Each specimen was subjected to an incremental axial loading of 1 kN interval after 28 days of casting. The flexural moments, deflections and crack width at failure were obtained. The experimental flexural crack and theoretical flexural cracks for both types of slabs were compared. The result for flexural moments for waffle was 5.526 kNm, while solid slab was 3.684 kNm. The deflections showed that waffle slabs has 3.64 mm while solid has 9.28 mm, hence waffle has a higher structural stiffness than solid slabs, but the flexural cracks did not give the same results especially for the estimated crack width. It was concluded that estimated results based on developed equations may not be accurate because it is based on ideal situation.

关键词： Models waffle slab solid slabs flexural moments flexural cracks deflections.

Fingerprint Database Optimization Using Watershed Transformation Algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Optimization 2014年第4期3卷 59-67页

作者： Owoeye Kolade ajayi Adedoyin Olayinka Ukorigho Ovie Department of Mathematical Sciences Ekiti State University Ado Ekiti Nigeria

Fingerprints are a unique feature for identification and verification of humans. The need to optimise several databases for storing the images of fingerprints is a major concerning issue. Several segmentation algorithms have been used in the time past but there are still several challenges facing some current segmentation algorithms like computational efficiency. Another challenge is that segmentation procedure can be impractically slow, or requires extremely large amounts of memory. This paper addresses the challenges by employing watershed flooding algorithm on the fingerprint images so as to optimize the sizes of the databases. A pre-processing plug-in that implements this segmentation process is developed using Java. We showed its effectiveness by testing it on fingerprint image dataset and the entropy showed that the segmented images sizes were reduced.

关键词： Watershed Transformation Fingerprint Segmentation Entrophy

Studies on Human Intestinal Parasites in Refuse Dumps

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Life Sciences 2010年第1期4卷 55-59页

作者： Samson Olusegun Adewole Andrew Ayodeji ajayi Department of Zoology University of Ado Ekiti Ado-Ekiti P.M.B. 5363 Nigeria

This study investagated the data of the prevalence of intestinal parasites of human from September 2007 to July 2008 using faecal samples which were picked from refuse dump sites. A total of 2,050 stool samples picked and examined from five selected popular refuse dump sites in Ado-Ekiti. And Entamoeba histolytica, Giardia lamblia and Balantidium coli were mostly identified. The analysis of the infection shows that E. histolytica has a percentage prevalence of 65.5%, followed by G. lamblia with 42.5% and B. coli having 1.9%. Multiple infections of these parasites were also prevalent. There was a positive correlation （r=0.995, P〈0.05） between percentage prevalence of infection and home surroundings, waste, sewage disposal facilities and habits. Also, there was a significant difference （t=1 1.06, P〈0.05） in the prevalence of infections between location A and B. Probable ways of eliminating/controlling the disease are also highlighted.

关键词： Prevalence intestinal parasites transmission refuse dumps.

Systematic Importance of Leaf Anatomical Characters in Some Species of Microcos Linn. Section Eumicrocos Burret. in Nigeria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2016年第1期7卷 108-117页

作者： Emmanuel Oyeniyi Shokefun Abiodun Emmanuel ayodele Akinwunmi Johnson Akinloye Department of Botany University of Ibadan Ibadan Nigeria Department of Botany Obafemi Awolowo University Ile-Ife Nigeria

The leaf anatomy of six Microcos L. species belonging to section Eumicrocos in Nigeria was investigated by transverse sectioning of the lamina and examined by light microscope to determine their taxonomic significance in species delimitation and classification. The common anatomical characteristics in all the species are as follows: the uniseriate epidermis;the hypostomatic and bifacial leaves;presence of 2 layers of palisade tissues;presence of bundle sheath extension to both epidermises;presence of glandular and non-glandular trichomes;presence of secretory ducts on abaxial surface;presence of druse crystal in the mesophyll and midrib and;sclerenchyma cells associated with the phloem. Anatomical characters which are significant for species delimitation include: the presence/absence of sclerenchyma cells associated with the xylem in the midrib;presence/absence of starch grains in the mesophyll and midrib;the presence/absence of secretory ducts on the adaxial surface of the midrib;the presence/absence of medullary plates in midrib;the number of secretory ducts in the midrib and the midrib adaxial outline. The section can be separated into two distinct groups based on the number of spongy tissue layers in the mesophyll, number of sclerenchyma cells associated with the phloem and presence/absence of sclerenchyma cells in xylem both groupings correlated with those obtained from foliar epidermal and pollen characters. The importance of these characters is discussed in relation to the taxonomy of the taxon.

关键词： Leaf Anatomy Microcos Taxonomy Nigeria

Impact of Tooth Surface Loss on the Quality of Life of Patients Seen in a Nigerian Teaching Hospital

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Stomatology 2020年第4期10卷 50-60页

作者： Tunde Ogunrinde Deborah ajayi Iyabo Abiodun-Solanke University of Ibadan/University College Hospital Ibadan Nigeria

Background: Tooth surface loss (TSL) is a progressive process arising from erosion, abrasion, attrition or abfraction. It can affect individuals of any age group: children, young adult, adults or the elderly and can compromise the health of individual tooth or the entire dentition leading to poor quality of life of the affected person. Objective: To evaluate the pattern of TSL among dental patients in a Nigerian Teaching Hospital and to assess the impact of TSL on their quality of life. Subjects and Methods: The study was a cross-sectional study among patients with TSL in a Nigerian Teaching Hospital. The Oral Health Impact Profile-14 (OHIP-14) questionnaire was used to obtain information on the impact of TSL on the quality of life of the participants. Data collected were analysed using IBM SPSS version 20. Chi-square test was used to assess association between types of TSL and quality of life of the patients. Level of significance was set at p ≤ 0.05. Results: One hundred and twenty-five patients (Males = 72;Females = 53) with tooth wear lesions participated in the study. The most common type of tooth surface loss was attrition (40%) followed by abrasion (23.2%). The highest impact of TSL on the quality of life was painful sensation strongly affecting 39 (31.2%) patients. This was followed by problem with chewing. There was no statistically significant relationship between patients’ quality of life and types of tooth surface loss. Conclusion: The most common negative impact of TSL on patient quality of life was painful sensation.

关键词： Quality of Life Pattern Tooth Wear

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Men without Sperms

Open Journal of Urology 2018年第1期8卷 25-42页

作者： Abayomi B. ajayi Bamgboye M. Afolabi Victor D. ajayi Ifeoluwa Oyetunji Oluwafunmilola Biobaku Adedamilola Atiba Nordica Fertility Centre Lagos Nigeria Health Environment and Development Foundation Lagos Nigeria

Introduction: Men without sperm (azoospermic) make up about 15% of all infertile men in reproductive age of fatherhood. Male infertility is a health and social problem in many communities. Subjects and Methods: This retrospective study was carried from 2010 to 2015. Initially, 907 men were included in the study among whom 109 (12.02%), 346 (38.15%) and 452 (49.83%) were azoospermic, oligospermic and normospermic, respectively. This study only investigated the association between age, BMI, semen volume, liquefaction time and pus cells among normospermic and azoospermic men. Standard semen analysis was performed and subjects were categorized by age into Results: The 562 subjects of the study had means (±sd) age of 42.6 (±7.10) years and BMI of 27.0 (4.1) kg/m2 respectively. In all, 109 (19.4%) were azoospermic. Overweight and obese men were, respectively, more than 1? and about 2? times more likely to be azoospermic compared to normal weight men. Azoospermic men were significantly heavier than men with normal sperm count (t = -0.34;P-value = 0.003). Among those with normal weight, liquefaction time was significantly shorter (t = 5.49, P-value = 0.000001) in azoospermic (28.70 min.) than in men with normal sperm count (31.82 min.). Obese azoospermic men were about 4 times as likely to have high pus cells in semen than normal weight azoospermic men (OR = 3.82;95% CI: 0.39, 37.01). Multivariate regression analysis shows a strong but negative coefficient correlation between sperm concentration and BMI (coef. = -0.48, Std Err. = 0.25, P-value = 0.05, 95% CI: -0.96, 0.10). Conclusion: Our findings suggest that high BMI is associated with azoospermia. Azoospermia also did not seem to negatively impact liquefaction time.

关键词： Azoospermia Normal Sperm Concentration Age Body Mass Index Male Infertility Sub-Sahara Africa

Effects of pituitary extract,ovaprim,and bitter leaf(Vernonia amygdalina)on the histopathology of African catfish(Clarias gariepinus)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2018年第6期3卷 232-237页

作者： Blessing B.ajayi John O.Ogunsola Olufemi I.Olatoye Richard E.Antia Samuel Agbede Department of Veterinary Public Health and Preventive Medicine University of IbadanIbadan 200284Nigeria Veterinary Teaching Hospital University of IbadanIbadan 200284Nigeria Department of Veterinary Pathology University of IbadanIbadan 200284Nigeria

The development of aquaculture in Nigeria is constrained by the inadequate supply of high quality of fingerlings of African catfish(Clarias gariepinus).There are conflicting reports on the reproductive efficacy of Vernonia amygdalina when compared with the synthetic hormone Ovaprim(OV)and Pituitary Extract(PE)on *** histopathology of select organs in catfish treated with generic Ovaprim(OV),Pituitary Extract(CPE),and aqueous extract of Vernonia amygdalina(VAE)were *** female ***(average weight of 1 kg)wereevenly and randomly distributed to four *** in groups A,B,C,and D were injected intramuscularly with aqueous solutions of OV(0.5 mL/kg),PE(5 mg/kg),VAE(10 mg/kg),and distilled water(DW;0.5 ml),*** examinations of the ovary,liver,kidney,and spleen were carried *** revealed that OV-and PE-treated groups showed synchronous and synchronous ovarian development,vacuolar change of hepatocytes,thinning of hepatic cords,reduced renal haemopoietic compartments,tubular degeneration and necrosis,and decrease in splenic periarteriolar lymphoid sheaths(PALS).VAE-treated groups had asynchronous ovarian development with atretic ovarian follicles,widespread vacuolar change of hepatocytes,intact renal tubular and hemopoietic compartments,and preponderance of large and coalescing splenic *** conclude that VAE is an ineffective spawning agent,especially when compared with OV and PE,as VAE could not induce synchronous gonadal ***,VAE may have immunopotentiating,nephroprotective,and haemopoietic properties.

关键词： Clarias gariepinus Vernonia amygdalina extract Pituitary extract Ovaprim Gonadal development Histopathology Reproductive performance

Human health and occupational exposure to pesticides among smallholder farmers in cotton zones of Côte d'Ivoire

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Health 2011年第10期3卷 631-637页

作者： Oluyede Clifford ajayi Festus Kehinde Akinnifesi Gudeta Sileshi 不详

While precautionary efforts are being made to minimize human health problems associated with agricultural pesticides, the continued occurrence of occupational poisoning from these chemicals raises major concerns among stake- holders. Information gap on human health problems associated with pesticides poses major obstacles to making informed policy decisions, particularly in developing countries where most of the poisonings occurs. In this study, we identified acute human health symptoms associated with pesticide use in cotton zone of C?te d’Ivoire and, documented the response of rural households to the symptoms. The results show that cotton farmers in Cote d’Ivoire suffer from different occupational health hazards from exposure to agricultural pesticides. Key health symptoms reported by pesticide applicators are headache, rheum, cough, skin rash and sneezing. Pesticide applicators reported four times higher symptoms of ill health than other household members who do not normally handle pesticides. Although, households recognized pesticides as an important cause of ill health, some of the symptoms have been accepted as norm by individuals who apply pesticides. Official data on pesticide poisoning in the country is most likely to be seriously under-estimated as applicators visited formal health centers for medical assistance in only 2% of poisoning cases reported. There is a high likelihood that households in the study area under-estimated pesticide-related health costs in making farm production decision-making. Approaches to use economic instruments for reliable monitoring and reporting procedures to formulate appropriate policies and regulations to minimize exposure to pesticides are recommended. Health planners and policy makers should aim at reducing the risks posed by pesticide to farm households by, improving awareness of farmers;promote complementary approach (e.g. Integrated Pest Management) and, use of economic instruments and improved surveillance to bridge t

关键词： Occupational Health Health Policy Pesticide Externality Agriculture-Health Linkage Consumer Protection

Epidemiological Review of Macular Hole in Ekiti, Southwestern Nigeria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Ophthalmology 2020年第4期10卷 276-282页

作者： Iyiade A. ajayi Olusola J. Omotoye Stella Adegbehingbe Department of Ophthalmology Ekiti State University Teaching Hospital Ado-Ekiti Nigeria Department of Ophthalmology State Specialist Hospital Akure Nigeria

Background: Macular hole is a known cause of central visual defect with varying etiologies in different parts of the world. It was considered an untreatable condition until 1991 when varying treatment techniques began to emerge with resultant restoration of central vision. This study was carried out to evaluate the prevalence and pattern of Macular hole in a tertiary eye centre in Nigeria. Method: This is a prospective hospital-based study over a 5 year period spanning from November 2013 to October 2018. All patients with macular hole seen within this period were included in the study. Relevant data were recorded with a structured questionnaire and analysed with SPSS version 20. Results: There were 46 eyes of 42 patients which constituted about 0.5% of all new patients seen over the study period. Male to female ratio was 1:1.3 with age ranged between 15 and 91years (mean = 61.8 ± 16.5 years). The majority of the patients (95.7%) had Idiopathic macular hole. Half of the patients (54.8%) had visual acuity less than 3/60 in the affected eye at the time of presentation. The majority (95.7%) of the patients did not accept the recommended surgical treatment option because of financial incapacitation. Conclusion: Macular hole is a disease of marked visual consequence. Available treatment option is still not within the reach of the majority because of the high cost.

关键词： Macular Hole Southwestern Nigeria Epidemiological Review Central Visual Defect