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Bulk petroleum geochemistry of shales from the onshore Rio del Rey Basin,Cameroon

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Energy Geoscience 2022年第2期3卷 111-119页

作者： Christopher M.Agyingi noel C.Tangko Emmanuel Eseme Department of Geology University of BueaCameroon P.O.Box 63BueaCameroon Activation Laboratories Ltd AncasterONCanada

Petroleum production in the Rio del Rey Basin,which is an extension of the Niger Delta of Nigeria into Cameroon,has been limited to the Tertiary offshore portion since the late *** to dedlining reserves in this offshore portion,the onshore Cretaceous portion of the basin attracted significant attention in the last *** the present *** from outcrops in the onshore portion of the basin were analyzed to evaluate their potential as source rocks,assess hydrocarbon generation,and highlight their signifcance for *** observations,total organic carbon(TOC)measure-ments,and Rock Eval pyrolysis were used to generate data for these ***-eval S2 values(0.42-3 mg HC/g rock)based on measured present-day TOC values(0.58-2.44 wtx)of the shales studied signify poor to fair source rock potentials,whereas calculated S2 values(1.74-8.19 mg HC/g rock)based on estimated original TOC values(0.67-2.87 wt%)produced fair to good source rocks containing Type Ⅱ/Ⅲ kerogen,which were transformed by maturity to the present-day Type Ⅲ/Ⅳ *** of the samples based on Tmax values varying between 439 and 471℃are equivalent to maturity values ranging between 0.74% R_(r) and 1.32% R_(r), and these represent the peak oil to condensate/wet gas zones of hy-drocarbon *** results demonstrate that mature source rocks are present in the onshore part of the Rio del Rey Basin,and thus,it is suitable for petroleum exploration.

关键词： Shale Rio del Rey Basin Total organic carbon Rock-eval Petroleum geochemistry Cameroon

Remarkable Link between Projected Uncertainties of Arctic Sea-Ice Decline and Winter Eurasian Climate

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Advances in Atmospheric Sciences 2018年第1期35卷 38-51页

作者： Hoffman H.N.CHEUNG noel KEENLYSIDE Nour-Eddine OMRANI Wen ZHOU Geophysical Institute University of BergenBergen 5007Norway Bjerknes Centre for Climate Research University of BergenBergen 5007Norway Nansen Environmental and Remote Sensing Center Bergen 5006Norway Guy Carpenter Asia-Pacific Climate Impact Centre School of Energy and EnvironmentCity University of Hong KongHong KongChina City University of Hong Kong Shenzhen Research Institute Shenzhen 518057China

We identify that the projected uncertainty of the pan-Arctic sea-ice concentration(SIC) is strongly coupled with the Eurasian circulation in the boreal winter(December–March; DJFM), based on a singular value decomposition(SVD) analysis of the forced response of 11 CMIP5 models. In the models showing a stronger sea-ice decline, the Polar cell becomes weaker and there is an anomalous increase in the sea level pressure(SLP) along 60°N, including the Urals–Siberia region and the Iceland low region. There is an accompanying weakening of both the midlatitude westerly winds and the Ferrell cell,where the SVD signals are also related to anomalous sea surface temperature warming in the midlatitude North *** the Mediterranean region, the anomalous circulation response shows a decreasing SLP and increasing precipitation. The anomalous SLP responses over the Euro-Atlantic region project on to the negative North Atlantic Oscillation–like ***, pan-Arctic SIC decline could strongly impact the winter Eurasian climate, but we should be cautious about the causality of their linkage.

关键词： Arctic climate Siberian high Icelandic low three-cell meridional circulation

Analysis of an Ensemble of High-Resolution WRF Simulations for the Rapid Intensification of Super Typhoon Rammasun(2014)

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Advances in Atmospheric Sciences 2020年第2期37卷 187-210页

作者： Xun LI noel EDAVIDSON Yihong DUAN Kevin JTORY Zhian SUN Qinbo CAI Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province China Meteorological AdministrationHaikouHainan 570203China Hainan Meteorological Services China Meteorological AdministrationHaikouHainan 570203China Research and Development Branch Bureau of MeteorologyMelbourne 3001Australia State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China

Diagnostics are presented from an ensemble of high-resolution forecasts that differed markedly in their predictions of the rapid intensification(RI)of Typhoon *** show that the basic difference stems from subtle differences in initializations of(a)500-850-h Pa environmental winds,and(b)midlevel moisture and *** then describe how these differences impact on the evolving convective organization,storm structure,and the timing of *** expected,ascent,diabatic heating and the secondary circulation near the inner-core are much stronger in the member that best forecasts the *** evolution of vortex cloudiness from this member is similar to the actual imagery,with the development of an inner cloud band wrapping inwards to form the *** present evidence that this structure,and hence the enhanced diabatic heating,is related to the tilt and associated dynamics of the developing inner-core in *** the most accurate ensemble member:(a)inhibition of ascent and a reduction in convection over the up-shear sector allow moistening of the boundary-layer air,which is transported to the down-shear sector to feed a developing convective asymmetry;(b)with minimal ventilation,undiluted clouds and moisture from the down-shear left quadrant are then wrapped inwards to the up-shear left quadrant to form the eyewall cloud;and(c)this process seems related to a critical down-shear tilt of the vortex from midlevels,and the vertical phase-locking of the circulation over up-shear *** the member that forecasts a much-delayed RI,these processes are inhibited by stronger vertical wind shear,initially resulting in poor vertical coherence of the circulation,lesser moisture and larger *** analysis suggests that ensemble prediction is needed to account for the sensitivity of forecasts to a relatively narrow range of environmental wind shear,moisture and vortex inner-structure.

关键词： typhoons rapid intensification ensemble simulation spin-up processes ventilation vertical wind shear

Petrographic and geochemical characterization of weathered materials developed on BIF from the Mamelles iron ore deposit in the Nyong unit, South-West Cameroon

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Acta Geochimica 2021年第2期40卷 163-175页

作者： Tessontsap Teutsong Jean Pierre Temga Armelle Ayissi Enyegue Nicodeme noel Feuwo Dieudonne Bitom Department of Earth Sciences University of Yaounde IP.O.Box 812YaoundeCameroon Ministry of Mines Industry and Technological DevelopmentYaoundeCameroon University of Dschang P.O.Box 96Dschang.Cameroon

Iron ore deposits hosted by Precambrian banded iron formation(BIF)are the most important source of mineable *** Cameroon,they are located in the southern part of the *** study reports the petrological and geochemical data of iron ores collected from a weathering profile in the Mamelles BIF deposit,SW *** profile is composed of three levels which are from the bottom to the top:the saprock,the ferruginous horizon,and the loose *** representative iron ore samples(rock fragments and loose clayey material)were collected along the profile and were subjected to petrographic and geochemical *** mineralogy consists of martite,goethite,quartz,and lesser amounts of hematite,magnetite,kaolinite,and *** presence of minerals such as kaolinite and goethite in the Mamelles iron ores suggests their supergene ***,the saprock is characterized by high iron content(70.25 wt%Fe_(2)O_(3) t),and low silica(26.38 wt%SiO_(2))and alumina(1.14 wt%Al_(2) O_(3)).The rock fragments collected from the ferruginous horizon display higher Fe2 O3 t(72-76.40 wt%),Al_(2) O_(3)(2.80-5.43 wt%),and lower SiO_(2)(16.70-18.35 wt%)contents,suggesting the leaching of silica during the enrichment *** loose clayey samples collected from both the ferruginous horizon and the upper loose horizon show lower iron and higher silica *** normalized to the underlying BIF saprock,both rock fragments and loose clayey ores display LREE enrichment,suggesting that they formed through supergene ***,most of the Mamelles iron ores are classified as medium-grade ores and a few display acceptable contents in ***,this petrological and geochemical study of the Mamelles iron ores revealed encouraging *** its strategic location near the deep seaport,the deposit should be investigated in more detail for its mining potential.

关键词： Mamelles BIF Medium-grade iron ore Supergene origin Nyong unit Cameroon

Synthesis of Ag and Cd nanoparticles by nanosecond-pulsed discharge in liquid nitrogen

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Frontiers of Chemical Science and Engineering 2019年第2期13卷 360-368页

作者： Mahmoud Trad Alexandre Nominé Natalie Tarasenka Jaafar Ghanbaja Cédric noel Malek Tabbal Thierry Belmonte Universite de Lorraine CNRSIJLF-54000 NancyFrance B.I. Stepanov Institute of Physics National Academy of Sciences of BelarusMinskBelarus Department of Physics American University of BeirutBeirutLebanon

The synthesis of CdO, Ag2O (5nm) and Ag (~20~30 nm) nano-objects is achieved simultaneously by nanosecond-pulsed discharges in liquid nitrogen between one cadmium electrode and one silver electrode. Oxidation occurs when liquid nitrogen is fully evaporated and nanoparticles are in contact with the air. No alloy is formed, whatever the conditions, even though both elements are present simultaneously, as showed by timeresolved optical emission spectroscopy. This lack of reactivity between elements is attributed to the high pressure within the discharge that keeps each metallic vapor around the electrode it comes from. Each element exhibits a specific behavior. Cubic Cd particles, formed at 4 kV, get elongated with filamentary tips when the applied voltage reaches 7 and 10 kV. Cd wires are formed by assembly in liquid nitrogen of Cd nanoparticles driven by dipole assembly, and not by dielectrophoresis. On the contrary, silver spherical particles get assembled into 2D dendritic structures. The anisotropic growth of these structures is assumed to be due to the existence of pressure gradients.

关键词： spark discharges submerged discharges timeresolved optical emission spectroscopy liquid nitrogen

Critical thinking / 7th ed.

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Corporate governance and firm value: Evidence from Chinese state-controlled listed firms

2004年

作者： Brooke noel Moore Richard Parker.

Includes index.

ISBN: (数字)0072818816

ISBN: (纸本)0072818816

Includes index.

关键词： Critical thinking.

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China Journal of Accounting Research 2013年第2期6卷 89-112页

作者： noel W.Leung Mei-Ai Cheng Lingnan Institute of Further Education Lingnan University Department of Accounting Information National Taipei College of Business

The association between corporate governance and firm value has been extensively studied in Chinese listed firms. Based on the characteristics of their ultimate shareholders, Chinese listed firms can be categorised as(1) central statecontrolled,(2) local state-controlled or(3) non-state-controlled. Some scholars have described Chinese government policy as ‘zhuada fangxiao', thus suggesting that the corporate governance mechanisms(CGMs) of central state-controlled listed firms(SCLFs) are better than those of local state-controlled listed firms. Therefore, this paper specifically examines the influence of CGMs on the value of central SCLFs and local SCLFs. Analysis of 2006 firm-year observations from 2007 to 2009 suggests that the aggregate ownership of other large shareholders and the remuneration of top executives exhibit different effects on firm value in central and local SCLFs. The results also provide evidence that there is no endogenous effect of firm value on the ownership of the largest shareholder in central and local SCLFs.

关键词： Corporate governance State-owned enterprises State-controlled listed firms Firm value

Etiology of sinonasal inverted papilloma: A narrative review

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World Journal of Otorhinolaryngology-Head and Neck Surgery 2017年第1期3卷 -页

作者： Ming-Jie Wang Julia E.noel Department of Otolaryngology-Head and Neck Surgery Beijing TongRen HospitalCapital Medical UniversityBeijing 100730China Department of Otolaryngology-Head and Neck Surgery Division of Rhinology and Endoscopic Skull Base SurgeryStanford University Medical CenterStanfordCA 94305USA

Objective:Sinonasal inverted papilloma (IP) is a benign and uncommon tumor of the nasal cavity and paranasal sinuses with a tendency for recurrence and even malignant *** the morphology and clinical behavior of this lesion has been well described,its etiology remains ***:Computerized searches were performed in PubMed,Scopus,and Google scholar through May *** this review,etiologic factors including human papilloma virus (HPV),Epstein-Barr virus (EBV),cell cycle related proteins and angiogenic factors,occupational and environmental exposures,and chronic inflammation,will be ***:Many studies indicate that HPV has been detected in a significant percentage of IP,while EBV has not been shown to be significantly *** cell cycle regulatory factors and angiogenic proteins contribute to the dysregulation of proliferation and apoptosis,and facilitate migration and tumor *** exposures,such as welding and organic solvents,have been implicated,and smoking seems more critical to recurrence and dysplasia rather than initial IP *** inflammation may also have a causative relationship with inverted papilloma,but the mechanism is ***:Though etiology of sinonasal IP remains controversial,the studies reviewed here indicate a role for viral infection,cell cycle and angiogenic factors,environmental and occupational exposure,and chronic *** study on etiologic factors is necessary for clinical guidance and therapeutic targets.

关键词： Sinonasal inverted papilloma Human papilloma virus Occupational exposure Smoking Chronic inflammation

Integrity and resilience in the face of multiple crises:commentary from Puerto Rico

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Forensic Sciences Research 2021年第3期6卷 316-319页

作者： Richard J.noel Jr Jose A.Torres-Ruiz Department of Basic Sciences School of MedicinePonce Health Sciences UniversityPoncePRUSA Office of the Chancellor Ponce Health Sciences UniversityPoncePRUSA

Since 2010,the population of Puerto Rico has declined by 11.8%and is currently 3.3 million peo-ple[1].This worrisome trend is a result of a pleth-ora of island-wide challenges spanning financial difficulties,natural disasters,and *** over a decade of economic hardship and debt,incapacitating hurricanes,Irma and Maria,destroyed large swaths of the island in *** still recovering from that disaster,a magnitude 6.4 earthquake centered about 5 miles off the south-western coast on January 7,2020,destroying build-ings and roads in southwestern Puerto *** event,and subsequent aftershocks that continue until today,further aggravate an already stressed *** the mix,viral epidemics have brought fur-ther economic,social,and health-related *** Rico was the centre of the 2016-2017 Zika virus infections,representing over 85%of the US infections in 2016[2].

关键词： island disaster southwestern