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Evaluation of the use of sublevel open stoping in the mining of moderately dipping medium-thick orebodies

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International Journal of Mining Science and Technology 2021年第2期31卷 333-346页

作者： Shuai Xu Ruiyu Liang fidelis TSuorineni Yuanhui Li Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang 110819China School of Mining and Geosciences Nazarbayev UniversityAstana 010000Kazakhstan School of Natural Resources and Civil Engineering Northeastern UniversityShenyang 110819China

The flow of blasted ore during mining of moderately dipping medium-thick orebodies is a *** a suitable mining system for such ore bodies is *** paper proposes a diamond layout sublevel open stoping system using fan blastholes with backfilling to mine such *** evaluate the performance of system the relationships between ore recovery and stope footwall dip angle,footwall surface roughness,drawpoint spacing and production blast ring burden were *** ore recovery data set from 81 laboratory physical model experiments was established from combinations of the listed *** modules in a back propagation neural network structure were compared,and an optimal network structure *** ore recovery backpropagation neural network(BPNN)forecast model was *** the model and sensitivity analysis of the factors affecting the proposed open stope mining system,the significance of each factor on ore recovery was *** study results were applied to a case study at the Shandong Gold Group Jiaojia Gold *** results showed that the application of a BPNN and sensitivity analysis models for ore recovery prediction in the proposed mining system and field experimental results confirm that the suggested mining method is feasible.

关键词： Moderately dipping medium-thick orebody Sublevel open stoping Fan blastholes Ore recovery Backpropagation neural network

An improved outer pipe method for expansive pressure measurement of static cracking agents

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International Journal of Mining Science and Technology 2022年第1期32卷 27-39页

作者： Shuai Xu Pengyuan Hou Runran Li fidelis T.Suorineni Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang 110819China School of Mining and Geosciences Nazarbayev UniversityAstana 010000Kazakhstan

Static cracking agent(SCA)is actively investigated as an alternative to explosive blasting for rock breakage due to its immense expansion *** can eliminate the negative effects of shock,noise and harmful gases encountered in explosive blasting *** measurement and deep understanding of the expansive properties of SCAs are important in their industrial *** improved outer pipe method(OPM),termed the upper end surface method(UESM),is proposed in this paper to overcome the shortcomings of the OPM in the expansive pressure measurement of *** simulation is used to proof the concept and a mathematical model established to relate the internal pressure and the radial strains at different positions in the upper end surface method test *** new equipment is calibrated using oil pressure and strain *** calibrated equipment is then used to measure the expansion pressure of SCA at three different water contents to proof its *** differences in the measurements with OPM and UESM at three different moisture contents are less than 4%.The experimental results confirm the accuracy and applicability of the more user friendly and less expensive UESM in the measurement of the expansive pressures of SCAs.

关键词： Static cracking agent Hydration reaction Expansive pressure measurement Outer pipe method Upper end surface method Numerical simulation

CFD evaluation of pressure drop across a 3-D filter housing for industrial gas turbine plants

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Frontiers in Energy 2016年第2期10卷 192-202页

作者： fidelis I. ABAM Samuel O. EFFIOM Olayinka S. OHUNAKIN Department of Mechanical Engineering Michael Okpara University ofAgriculture Umudike Umuahia 02155 Nigeria Department of Mechanical Engineering Cross River University ofTechnology Calabar 540252 Nigeria Department of Mechanical Engneering Covenant Universiy Ota 11 O01Nigeria

This paper investigated the flow distribution and total pressure drop across a designed 3-D filter housing integrated with a 3-stage filtration system using computa- tional fluid dynamics （CFD）. The filter housing model was proposed for a heavy-duty industrial gas turbine plant operating at an average ambient temperature of 20℃.The pressure drops across the classes of filters were 652.8 Pa, 2692.2 Pa, 887.8 Pa, 776.2 Pa and 2304.2 Pa for I-GB, GB-GA, GA-FA, FA-HA, and HA-O, respectively. The results obtained indicated an acceptable total pressure drop of 7.2% for the entire filter housing before filter clean-up. Although the CFD simulation result shows that small outlet flow velocity and transonic flows exist at the outlet of the filter housing, the designed filter housing was proved compatible with the studied GT, for inlet flow conditions between 600≤ Wair≤610 kg/s and 60≤Vair≤70 m/s for the air flow rate and velocity, respectively. Furthermore, the designed filter housing could be adopted for the studied GT and locations of Usan and Maiduguri in Nigeria, and other locations with similar environmental conditions.

关键词： computational fluid dynamics (CFD) pressure drop flow distribution filter housing gas turbine

Upper arm composition and nutritional status of school children and adolescents in Abeokuta,Southwest Nigeria

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World Journal of Pediatrics 2014年第4期10卷 336-342页

作者： Idowu Odunayo Senbanjo Kazeem Adeola Oshikoya Olisamedua fidelis Njokanma Department of Pediatrics and Child Health Lagos State University College of MedicinePMB 21266IkejaLagos State 100001Nigeria Pharmacology Department Lagos State University College of MedicinePMB 21266IkejaLagosNigeria Academic Division of Child Health Medical SchoolUniversity of NottinghamDerbyshire Children's HospitalUttoxeter RoadDerby DE223DTUK

Background:Upper arm composition is a reflection of body protein and calorie ***,there is a paucity of data on upper arm composition of children from African countries,including *** study aimed to determine the composition of upper arm and nutritional status of school children in Abeokuta,Nigeria and to compare with international reference *** sensitivity and specifi city of upper arm muscle area by height(UAMAH)as a nutritional assessment tool was also ***:Five hundred and seventy children aged 5 to 19 years were selected from seven schools using multistage random ***,height,mid-upper arm circumference(MUAC)and triceps skin fold thickness(TSF)were *** mass index,upper arm muscle area(UAMA),upper arm fat area(UAFA),fat percentage and UAMAH were ***:The TSF,UAFA and fat percentage were significantly higher in females than males at each age *** and UAMA were significantly higher in female children aged 10-14 years,whereas UAMA was significantly higher in male children aged 15-19 *** and UAFA of the children were lower than those of Americans but similar to those of Zimbabweans,and higher than those of *** sensitivity and specifi city of UAMAH for detecting wasting were 80.8%and 63.9%,respectively,whereas the corresponding values for stunting were 32.2%and 58.2%,***:The school children studied have a combination of poor calorie and protein *** may be a valuable tool for complete evaluation of the nutritional status of school children.

关键词： nutritional status school children upper arm fat upper arm muscle

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Editorial

Journal of Rock Mechanics and Geotechnical Engineering 2015年第5期7卷 481-482页

作者： fidelis T.Suorineni Mine Geotechnical Engineering School of Mining EngineeringUNSW Australia Kensington

The author was surprised to be contacted by the Journal(Journal of Rock Mechanics and Geotechnical Engineering,JRMGE)to write an Editorial for Volume 7,Issue 5,*** author is surprised because he is not a member of the journal Editorial Board nor has he ever reviewed a paper for this *** is also surprised because he is an ardent critic of various published works that would have discouraged anyone looking for commentary on published ***,the author is pleased to be given that opportunity to pro-

关键词： Editorial

Uptake of in-vitro fertilization among couples attending fertility clinic in a tertiary health institution

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Asian pacific Journal of Reproduction 2022年第1期11卷 12-19页

作者： Mabel Olubunmi Omobude Olaolorunpo Olorunfemi fidelis Uchendu Okafor Department of Reproductive Health Nursing Edo State College of Nursing ScienceBenin CityEdo StateNigeria Department of Medical Surgical Nursing Faculty of Basic Medical ScienceFederal UniversityOye-EkitiEkiti StateNigeria Department of Nursing University of BeninBenin CityNigeria

Objective:To identify factors that determine the uptake of in-vitro fertilization(IVF),and to determine the predicting effect of the identified factors on the uptake of IVF among couples attending fertility clinic at a tertiary health institution in Benin City,***:This study adopted a cross-sectional descriptive design.A self-structured questionnaire tested was validated and administered to 250 couples who attended fertility *** were collected from March 2021 to June 2021 and were analyzed using the Statistical Package for Social Science(SPSS)version *** were presented and interpreted using descriptive statistics and inferential statistics such as Chi-square,univariate statistics and multivariate logistic regression ***:Among 250 couples,154(61.6%)were willing to adopt *** multivariate logistic regression analysis showed that catholic religion[odds ratio(OR)0.21,95%confident interval(CI)0.54-0.73],family income(OR 1.50,95%CI 1.10-2.00)and age(OR 1.04,95%CI 1.01-1.10)were the major factors that determined the uptake of IVF,with P-value of<0.001,0.018 and 0.031,***:The uptake of IVF could be sustained or improved on,if the government should improve on the cost of living for families,and religious leaders need to be encouraged to pass on the information about IVF to their members to be well guided about the possibilities of IVF.

关键词： Uptake of IVF Couples’age Family income Catholic religion Cost of living Nigeria

End-use energy utilization efficiency of Nigerian residential sector

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Frontiers in Energy 2014年第3期8卷 322-334页

作者： fidelis I. ABAM Bethrand N. NWANKWOJIKE Ekwe B. EKWE Olayinka S. OHUNAKIN Department of Mechanical Engineering Micheal Okpara University of Agriculture Umudike 02155 Nigeria Department of Mechanical Engineering Covenant University Ogun State 11001 Nigeria

In this paper, the end-use efficiencies of the different energy carriers and the overall energy efficiency in the Nigerian residential sector （NRS） were estimated using energy and exergy analysis. The energy and exergy flows were considered from 2006 to 2011. The overall energy efficiency ranges from 19.15% in 2006 to 20.19% in 2011 with a mean of （19.96±0.23）% while the overall exergy efficiency ranges from 4.34% in 2006 to 4.40% in 2011 with a mean of （4.31±0.059）%. The energy and exergy efficiency margin was 15.58% with a marginal improvement of 0.07% and 0.02%, respectively when compared with previous results. The contribution of the energy carriers to the total energy and exergy inputs were 1.45% and 1.43% for electricity, 1.95% and 3% for fossil fuel and 96.6% and 95.57% for bio-fuel. The result shows that approximately 65% of the residence use wood and biomass for domestic cooking and heating, and only a fraction of the residence have access to electricity. LPG was found to be the most efficient while kerosene, charcoal, wood and other biomass the least in this order. Electricity utilization exergy efficiency is affected by vapor-compression air conditioning application apart from low potential energy applications. In addition, this paper has suggested alternatives in the end-use application and has demonstrated the relevance of exergy analysis in enhancing sustainable energy policies and management and improved integration techniques.

关键词： end-use energy exergy efficiency residentialsector Nigeria

Antifertility effects of Azadirachta indica methanol seed extract on canine spermatozoa in vitro

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Asian pacific Journal of Reproduction 2020年第3期9卷 135-141页

作者： Chike fidelis Oguejiofor Ifeanyi Gabriel Eke Kenneth Orji Anya Department of Veterinary Obstetrics and Reproductive Diseases Faculty of Veterinary MedicineUniversity of NigeriaNsukka 410001Nigeria Department of Veterinary Physiology and Pharmacology Faculty of Veterinary MedicineUniversity of NigeriaNsukka 410001Nigeria

Objective:To investigate the effects of Azadirachta(A.)indica methanol seed extract on canine male fertility in ***:The effect of the *** methanol seed extract(2.5,5.0,10.0 and 20.0 mg/mL,respectively)on canine spermatozoa was evaluated in vitro at 1.0,2.5,5.0 and 10.0 min *** two controls were comprised of sperm sample in phosphate-buffered saline,and sperm sample in phosphate-buffered saline and 1%dimethyl sulfoxide,*** experiment was repeated(n=3)in duplicates with semen collected from 3 adult *** effect of *** methanol seed extract treatments on canine spermatozoal total and progressive motility(phase-contrast microscopy),sperm vitality(eosin-nigrosin vital staining method)and total abnormalities(phase contrast microscopy,eosin-nigrosin staining and Papanicolaou staining methods)were ***:*** methanol seed extract treatment caused a concentration and time-dependent decrease in sperm percentage total motility,progressive motility and *** absence of sperm revival post-treatment provided evidence of a permanent or irreversible incapacitation of sperm by *** methanol seed ***:The inhibition of sperm motility and significant spermicidal effect observed post-treatment suggest that *** methanol seed extract may produce a potent antifertility or contraceptive effect in dogs if applied as an intra-vaginal cream pre-coitus.

关键词： Antifertility Azadirachta indica Canine Spermatozoa Contraceptive

The use of bacterial cellulose from kombucha to produce curcumin loaded Pickering emulsion with improved stability and antioxidant properties

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Food Science and Human Wellness 2023年第2期12卷 669-679页

作者： Zhiyu Li Wenxiu Hu Jiajia Dong fidelis Azi Xiao Xu Chuanhai Tu Sijie Tang Mingsheng Dong College of Food Science and Technology Nanjing Agricultural UniversityNanjing 210095China College of Pharmacy Nanjing University of Chinese MedicineNanjing 210023China School of Life Science Shaoxing UniversityShaoxing 312000China College of Food Science and Pharmacy Zhejiang Ocean UniversityZhoushan 316022China

Curcumin is a bioactive molecule with limited industrial application because of its instability and poor solubility in ***,curcumin-loaded Pickering emulsion was produced using purified bacterial cellulose from fermented kombucha(KBC).The morphology,particle size,stability,rheological properties,and antioxidant activities of the curcumin-loaded Pickering emulsion were *** fluorescence microscope and scanning electron microscopy images showed that the curcumin-loaded Pickering emulsion formed circular droplets with good *** curcumin-load Pickering emulsion exhibited better stability under a wide range of temperatures,low p H,sunlight,and UV-365 nm than the free curcumin,indicating that the KBC after high-pressure homogenization improved the stability of the *** encapsulated curcumin retained its antioxidant capacity and exhibited higher functional potential than the free *** study demonstrated that the KBC could be an excellent material for preparing a Pickering emulsion to improve curcumin stability and antioxidant activity.

关键词： Bacterial cellulose Curcumin Pickering emulsion Stability Antioxidant activity