检索结果-南通市图书馆

Prediction of airway resistance in panel cave mines using a discrete and continuum model

在线全文

学校读者我要写书评

暂无评论

International Journal of mining Science and Technology 2019年第5期29卷 781-784页

作者： kayode m.ajayi Khosro Shahbazi Purushotham Tukkaraja Kurt Katzenstein Department of mechanical Engineering SDSMTRapid CitySD 57701USA Department of mining Engineering and management SDSMTSD 57701USA Department of Geology and Geological Engineering SDSMTSD 57701USA

The configuration of an airway(or production drift)in panel cave mines is different from the typical(straight)mine airway *** drawpoints are connected to the airway(cross-cuts),which allows airflow from the cave into the airway or air loss from the airway into the cave due to the ventilation approach and cave *** affect airflow in the production drifts,but it is difficult to investigate these conditions from field or laboratory scaled ***,this study develops discrete and continuum computational fluid dynamics(CFD)models to study the effects of the ventilation approach and cave porosity on the airway *** findings show that:with active undercut ventilation,a unique resistance model is required for the airway in panel cave mines;and an increase in cave porosity decreases the drift’s *** findings provide essential tools for a panel cave ventilation design.

关键词： Airway resistance Caving mining method Panel cave mines Broken rocks Porous media Computational fluid dynamics(CFD)

Cymbopogon citratus aqueous leaf extract attenuates neurobehavioral and biochemical changes induced by social defeat stress in mice

在线全文

学校读者我要写书评

暂无评论

Chinese Herbal medicines 2020年第3期12卷 303-309页

作者： Solomon Umukoro Benneth Ben-Azu Abayomi m.ajayi Adaeze Adebesin Osagie Emokpae Neuropharmacology Unit Department of Pharmacology and TherapeuticsFaculty of Basic Medical SciencesCollege of MedicineUniversity of IbadanIbadan 200284Nigeria Department of Pharmacology Faculty of Basic Medical SciencesPAMO University of Medical SciencesPort Harcourt 500272Nigeria Department of Biochemistry University of AfricaToru-Orua 561Nigeria

Objective:Psychosocial stress has been implicated in the genesis of psychiatric disorders such as memory deficits,depression,anxiety and *** leaf extract of Cymbopogon citratus(CYC)otherwise known as lemongrass tea has antidepressant,anxiolytic and anti-amnesic effects in *** study was designed to evaluate if C citratus could reverse the neurobehavioral and biochemical derangements induced by social defeat stress(SDS)in the resident/intruder ***:Intruder male mice were divided into five groups(n=7):group 1 received saline(10 mL/kg,p.o.;non-stress control),group 2 also received saline(10 mL/kg,p.o.;SDS control)while groups 3-5 had ***(50,100 and 200 mg/kg,p.o.)daily for 14 *** SDS was carried out 30 min after each treatment from day 7 to day 14 by exposing each intruder mouse in groups 2-5 to a 10 min confrontation in the home cage of an aggressive resident *** neurobehavioral features(spontaneous motor activity-SmA,anxiety,memory,social avoidance and depression were then *** concentrations of nitrite,malondialdehyde and glutathione as well as acetylcholinesterase activity in the brain tissues were also ***:***(50,100 and 200 mg/kg)attenuated hypolocomotion,heightened anxiety,depressive-like symptom,memory deficit and social avoidance induced by *** altered levels of oxidative stress and acetyl-cholinesterase in SDS-mice were positively modulated by ***:The results of this study suggest that *** might mitigate psychosocial stress-induced neurologic diseases in susceptible individuals.

关键词： Cymbopogon citratus(DC.)Stapf depressive-like symptom memory deficit oxidative stress social avoidance social defeat stress

Conservation of indigenous medicinal botanicals in Ekiti State, Nigeria

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第9期7卷 713-718页

作者： kayode Joshua Department of Plant Science University of Ado-Ekiti P.M.B.5363 Ado-Ekiti Ekiti State Nigeria

The rapid appraisal method was used to identity the botanicals used ethnomedicinally from a total of 300 randomly selected respondents drawn from the existing three geo-political zones of Ekiti State, Nigeria. The results obtained revealed that about 40% of the 71 botanicals identified presently rare. most of the presently abundant botanicals are species primarily cultivated for other purpose other than medicine. most of the identified species are valued for their curative effects on malaria and fever, the predominant diseases in the study area. The need for the conservation of the rare species cannot be over emphasised as most rural dwellers in the study area depend mostly on herbs from these species. Strategies towards the attainment of this goal are proposed.

关键词： Conservation medicinal botanicals Nigeria

A discrete model for prediction of radon flux from fractured rocks

在线全文

学校读者我要写书评

暂无评论

Journal of Rock mechanics and Geotechnical Engineering 2018年第5期10卷 879-892页

作者： K.m. ajayi K. Shahbazi R Tukkaraja K. Katzenstein Department of mechanical Engineering South Dakota School of Mines and Technology Rapid City SD 57701 USA b Department of mining Engineering and management South Dakota School of Mines and Technology Rapid City SD 57701 USA Department of Geology and Geological Engineering South Dakota School of Mines and Technology Rapid City SD 57701 USA

Prediction of radon flux from the fractured zone of a propagating cave mine is basically associated with uncertainty and complexity. For instance, there is restricted access to these zones for field measure- ments, and it is quite difficult to replicate the complex nature of both natural and induced fractures in these zones in laboratory studies. Hence, a technique for predicting radon flux from a fractured rock using a discrete fracture network （DFN） model is developed to address these difficulties. This model quantifies the contribution of fractures to the total radon flux, and estimates the fracture density from a measured radon flux considering the effects of advection, diffusion, as well as radon generation and decay. Radon generation and decay are classified as reaction processes. Therefore, the equation solved is termed as the advection-diffusion-reaction equation （ADRE）. Peclet number （Pe）, a conventional dimensionless parameter that indicates the ratio of mass transport by advection to diffusion, is used to classify the transport regimes. The results show that the proposed model effectively predicts radon flux from a fractured rock. An increase in fracture density for a rock sample with uniformly distributed radon generation rate can elevate radon flux significantly compared with another rock sample with an equivalent increase in radon generation rate. In addition to Pe, two other independent dimensionless parameters （derived for radon transport through fractures） significantly affect radon dimensionless flux. Findings provide insight into radon transport through fractured rocks and can be used to improve radon control measures for proactive mitigation.

关键词： Radon mass flux Radon dimensionless flux Stochastic model Discrete fracture network (DFN) Caving mining method Fractured rocks

Computer applications for selecting operating parameters of stationary grain crop thresher

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2010年第3期3卷 8-18页

作者： Joshua Olanrewaju Olaoye kayode C Oni mary m Olaoye Agricultural&Biosystems Engineering Department University of IlorinIlorinNigeria National Centre of Agricultural mechanization IlorinNigeria Electrical Engineering Department University of IlorinIlorinNigeria

In this study,various operating parameters influencing performance of stationary grain crop threshers were *** parameters were deduced from the established analytical models describing the underlying principles for the crop characteristics and machine variables as factors influencing the overall machine performance of a stationary multi-crop thresher.A computer programme written in Visual Basic was used to select optimum operating performance of the threshing process in a stationary tooth–peg grain crop *** IITA-popularized stationary multi-crop thresher was used to test the practical feasibility of the computer based output of the threshing process.A split–split–unit statistical design was used for data *** data collected were analyzed using the GENSTAT 5 statistical package with its computer *** results showed that graphs of data from measured thresher performance indices against the predicted data for all the established models indicated high correlation between the models and the measured data at p≤5%significance *** minimum energy requirements for detachment of sorghum and rice were observed at the threshing cylinder speed of 500 r/min(10.5 m/s)and 615 r/min(13.0 m/s),*** combination of the threshing cylinder speed of 500 r/min(10.5 m/s)and 615 r/min(13.0 m/s)at crop moisture content of 12.8%and 16.2%indicated optimum threshing conditions for sorghum and rice,respectively.

关键词： computer applications grain models thresher performance simulation

尼日利亚Gongola盆地地层放射性热产量与生烃潜力

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

石油勘探与开发 2016年第3期43卷 411-416页

作者： OYEBANJO O m.ajayi T R TCHOKOSSA P Natural History museum Obafemi Awolowo University Department of Geology Obafemi Awolowo University Department of Physics Obafemi Awolowo University

以取自尼日利亚上贝努埃地槽Gongola盆地Kolmani-1井的样品为基础,对其放射性热产量进行了估算,并对放射性热产量对沉积物生油气潜力的影响进行了分析。研究采用精确标定的碘化钠伽马射线检测系统,对不同层组的38块样品（取样间隔73.2 m... 详细信息

以取自尼日利亚上贝努埃地槽Gongola盆地Kolmani-1井的样品为基础,对其放射性热产量进行了估算,并对放射性热产量对沉积物生油气潜力的影响进行了分析。研究采用精确标定的碘化钠伽马射线检测系统,对不同层组的38块样品（取样间隔73.2 m,包括砂岩、页岩、含煤页岩、砂质页岩、泥质砂岩）进行了40K、238U及232Th的放射性分析。研究结果表明,沉积物中放射性元素的放射性浓度存在显著变化,40K浓度最高;沉积物放射性热产量为228.44～1 412.82 p W/kg;Kolmani-1井砂岩和砂质页岩属于低热产量沉积物,含煤页岩、页岩及泥质砂岩属于中热产量沉积物,潜在烃源岩（页岩和含煤页岩层段）的放射性热产量值主要位于中热产量范围（750～1500 p W/kg）,同时具有生成液态烃和气态烃的能力。此外,沉积物的放射性热量约占盆地总地表热通量的10.9%～20.9%,沉积物的放射性热量是总地表热通量的重要组成部分,应将其纳入盆地的热模拟。

关键词：地层放射性放射性热产量生烃潜力 Gongola盆地

Neurogenesis dynamics in the olfactory bulb:deciphering circuitry organization, function, and adaptive plasticity

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1565-1581页

作者： moawiah m.Naffaa Department of Psychology and Neuroscience Duke UniversityDurhamNCUSA Department of Cell Biology Duke University School of MedicineDurhamNCUSA

Adult neurogenesis persists after birth in the subventricular zone, with new neurons migrating to the granule cell layer and glomerular layers of the olfactory bulb, where they integrate into existing circuitry as inhibitory interneurons. The generation of these new neurons in the olfactory bulb supports both structural and functional plasticity, aiding in circuit remodeling triggered by memory and learning processes. However, the presence of these neurons, coupled with the cellular diversity within the olfactory bulb, presents an ongoing challenge in understanding its network organization and function. moreover,the continuous integration of new neurons in the olfactory bulb plays a pivotal role in regulating olfactory information processing. This adaptive process responds to changes in epithelial composition and contributes to the formation of olfactory memories by modulating cellular connectivity within the olfactory bulb and interacting intricately with higher-order brain regions. The role of adult neurogenesis in olfactory bulb functions remains a topic of debate. Nevertheless, the functionality of the olfactory bulb is intricately linked to the organization of granule cells around mitral and tufted cells. This organizational pattern significantly impacts output, network behavior, and synaptic plasticity, which are crucial for olfactory perception and memory. Additionally, this organization is further shaped by axon terminals originating from cortical and subcortical regions. Despite the crucial role of olfactory bulb in brain functions and behaviors related to olfaction, these complex and highly interconnected processes have not been comprehensively studied as a whole. Therefore, this manuscript aims to discuss our current understanding and explore how neural plasticity and olfactory neurogenesis contribute to enhancing the adaptability of the olfactory system. These mechanisms are thought to support olfactory learning and memory, potentially through increased

关键词： network adaptability neurogenesis neuronal communication olfactory bulb olfactory learning olfactory memory synaptic plasticity

mitochondria–cGAS–STING axis is a potential therapeutic target for senescence-dependent inflammaging-associated neurodegeneration

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第3期20卷 805-807页

作者： Josém.Izquierdo Centro de Biología molecular Severo Ochoa(CBm) Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid(CSIC-UAM)MadridSpain

The word “senescence” comes from the Latin senescens, meaning “to begin to age”, and is characterized by a long-lasting but reversible block in proliferation, resulting from stress-induced cell cycle arrest of pre... 详细信息

关键词： Latin potential lasting

Paleo-productivity and petroleum source evaluation of the Nkporo and Awgu shales, Lower Benue Trough, Nigeria: Insight from inorganic geochemistry

在线全文

学校读者我要写书评

暂无评论

Energy Geoscience 2023年第3期4卷 139-148页

作者： Henry Yemagu madukwe Adebanji kayode Adegoke mutiu Adesina Adeleye Adeyinka Oluyemi Aturamu Department of Geology Faculty of ScienceEkiti State UniversityP.M.B.5363Ado-EkitiNigeria Department of Geology University of Malaya50603Kuala LumpurMalaysia Department of Geology Faculty of ScienceUniversity of IbadanIbadanNigeria

The petroleum paleo-productivity and generative potential of the Nkporo and Awgu shales in the Lower Benue Trough (LBT) were studied. major oxides were determined using Spectro Ciros Inductively-coupled plasma optical emission spectrometer (ICP-OES) while trace and rare earth elements were determined using an ELAN 9000 Inductively-coupled plasma mass spectrometer (ICP-mS). The shales have Co/Ni ratios greater than 0.1 suggesting oil source rocks with more marine source input due to brief marine incursion in the transition zone after deposition. The very low Ni values and moderate V values, and a lack of correlation between the TOC and sulphur content, suggests that the organic matter is of terrestrial Type Ⅲ;and the very low paleo-productivity (Ba/Al and P/Ti ratios) suggests that the organic matter is of terrestrial origin. The low V/Ni values of the Nkporo and Awgu shales (Av. ≈ 4) and the high metal concentrations indicate a matured status. From the K/Rb ratios of the Nkporo (191–259) and Awgu shales (198–261), it can be deduced that the organic matter within the shales experienced a considerable loss of K and the shales are mature to generate gaseous hydrocarbons.

关键词： maturity Organic matter Paleo-productivity Petroleum potentials Shale