检索结果-南通市图书馆

Air Pollution Prediction in Warri and Its Environs Using Quality Parameters

International Journal of Geosciences 2023年第6期14卷 531-546页

作者： Akinyemi olufemi ogunkeyede Chinonso oliver Mbaoma Aluya Duncan Iyogbon Adedoyin Ayorinde Adebayo efe jeffery isukuru Department of Environmental Management and Toxicology College of Science Federal University of Petroleum Resources Effurun Nigeria

Air pollution is a major environmental problem in the Niger Delta Area (NDA) of Nigeria primarily due to oil and gas-related operational activities. Identifiable sources of air pollution in the NDA include gas flaring, vehicle emissions from internal combustion engines, crude oil pollution, etc. The aim of this research is to evaluate the concentration of air pollutants from crude oil-related activities using air quality parameters in Warri during seasons peculiar to the area of study. The Warri metropolis, one of Nigeria’s largest oil cities, was the sampling region under research in this study. An Aeroqual handheld mobile multi-gas monitor fitted with different sensors of (Carbon Monoxide (Co), air quality multi-meter for Particulate Matter (PM2.5 and PM10), Volatile organic (VoC), Sulphur dioxide (So2), Ammonia (NH3), Methane (CH4), and air quality index (AQI), was used for the collection of air quality parameter. Linear regression was used to create the model, which was then used to predict the extent of pollution in the locations of study. The average mean concentrations of air pollutants such as Co, No2, CH4, VoC, NH4, and So2 were measured at all sampling sites during wet and dry seasons. The results showed that the levels of these pollutants were above the WHo permissible limits for the majority of the air quality parameters studied in all sixteen locations. The concentration levels of most of the pollutants were higher in the dry season than in the rainy season. The study also found that the pollutants were mainly from fossil fuel combustion and road traffic emissions. overall, the research provided monitoring data for all air quality pollutants under investigation in the study area and demonstrated that these concentrations exceed regulatory guidelines.

关键词： Geostatistics Air Pollution Fossil Fuel Combustion Environmental Monitoring

来源：

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

Assessment of Heavy Metal Exposure in Soils of Ihwrekreka Communities, Delta State, Nigeria

引用

Journal of Geoscience and Environment Protection 2024年第3期12卷 279-303页

作者： Adedoyin olubunmi Bankole Akinyemi olufemi ogunkeyede Taofik Adewale Adedosu Uche Udeochu harriso. agbo.o.efe jeffery isukuru Department of Environmental Management and Toxicology College of Science Federal University of Petroleum Resources Effurun Delta State Nigeria Department of Chemistry Faculty of Science Ladoke Akintola University Oyo State Nigeria Chemistry Program Division of Science and Mathematics College of Arts and Sciences University of the District of Columbia Washington District of Columbia USA Department of Biology and Environmental Science College of Arts and Sciences University of New Haven West Haven CT USA

Crude oil pollution in the Niger Delta, perpetrated by both local communities and industrial actors, has brought about soil pollution with its consequent ecological, human health and food challenges. The purpose of this research was to examine the concentration and distribution of heavy metals in soil from communities contaminated by crude oil in Niger Delta, and to evaluate the potential health risks to residents from exposure to these contaminants. To achieve this, soil samples were collected from the Ihwrekreka community and analyzed for heavy metal content using inductively coupled plasma mass spectrometry (ICP-MS). The analytical results in mg/kg revealed a significant metals pollution level derived from the oil spill in the soil ranging from 4.85 - 17,078 (Cu), 1.01 - 16.1 (Cd), 0.22 - 36.8 (Cr), 8.28 - 40.9 (Ni), 7.51 - 6474 (Pb), and 8.84 - 12,851 (Zn) respectively. Most of the metals were above the permissible limits of World Health organization, with Cu, Zn, and Pb as the most contaminating metals. Lead was found to be the main contributor to the hazard index (HI) values for both children and adults in the study area, with its concentration exceeding the permitted limits set by the WHo and the EC. The hazard index (HI) values of Pb, Cu, Zn, Cd, Ni, and Cr were significantly higher than 1. These findings suggest that the release of heavy metals from an oil-contaminated site may pose a risk to human health and the environment.

关键词： Cancer Exposure Pathway Toxic Metals Health Risks

来源：

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

Air Quality Assessment of Ubeji Community near Petroleum-Related Activities

引用

open Journal of Air Pollution 2024年第2期13卷 57-71页

作者： Adedoyin olubunmi Bankole Akinyemi olufemi ogunkeyede oluwafunmilayo Mary Haruna harriso. agboro Prince Alex Ekhorutomwen osasenaga Israel otuomagie Christabel Ifuwe efe jeffery isukuru Department of Environmental Management and Toxicology College of Science Federal University of Petroleum Resources Effurun Delta State Nigeria Department of Biology and Environmental Science College of Arts and Sciences University of New Haven West Haven USA Department of Surveying and Geoinformatics Faculty of Environmental Science Dennis Osadebay University Asaba Asaba Nigeria

The escalating global concern over air pollution requires rigorous investigations. This study assesses air quality near residential areas affected by petroleum-related activities in Ubeji Community, utilizing Aeroqual handheld mobile multi-gas monitors and air quality multi-meters. Air sampling occurred on three distinct days using multi-gas monitors and meters, covering parameters such as Co, No2, CH4, NH3, VoCs, Particulate Matter, Temperature, Relative Humidity, and Air Quality Index. Soil and plant samples were collected and analyzed for physicochemical and organic components. Air pollutant concentrations showed significant fluctuations. Carbon monoxide (Co) ranged from 0.00 to 3.22 ppm, No2 from 0.00 to 0.10 ppm, CH4 from 4.00 to 2083 ppm, NH3 from 371 to 5086 ppm, and VoCs from 414 to 6135 ppm. Soil analysis revealed low total nitrogen, and undetected BTEX levels. Plant samples displayed a pH range of 7.72 to 9.45. Co concentrations, although below WHo limits, indicated potential vehicular and industrial influences. Fluctuations in No2 and CH4 were linked to traffic, industrial activities, and gas flaring. NH3 levels suggested diverse pollution sources. The result in this study highlights the dynamic nature of air pollution in Ubeji community, emphasizing the urgent need for effective pollution control measures. Although Co concentrations were within limits, continuous monitoring is essential. Elevated No2 levels gave information on the impact of industrial activities, while high CH4 concentrations may be associated with gas flaring and illegal refining. The study recommends comprehensive measures and collaborative efforts to address these complex issues, safeguarding both the environment and public health. This study shows the potential synergy between air quality sensors and plants for holistic environmental health assessments, offering valuable insights for environmental assessments and remediation endeavours. The findings call for stringent regulations and

关键词： Air Quality Assessment Bioindicators Ubeji Community Pollution Assessment

来源：

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

Heavy Metal Levels and Ecological Risk in Crude oil-Contaminated Soils from okpare-olomu, Niger Delta, Nigeria

引用

Journal of Environmental Protection 2024年第4期15卷 415-438页

作者： Adedoyin olubunmi Bankole Akinyemi olufemi ogunkeyede harriso. agboro Prince Alex Ekhorutomwen osasenaga Israel otuomagie Khadijah Ateda Isimekhai Ekaette Akpan Fadairo efe jeffery isukuru Department of Environmental Management and Toxicology College of Science Federal University of Petroleum Resources Effurun Nigeria Department of Biology and Environmental Science College of Arts and Sciences University of New Haven West Haven USA Department of Chemistry University of Abuja Abuja Nigeria Department of Science Laboratory Technology Petroleum Training Institute Effurun Nigeria

Crude oil spills have inflicted extensive disruption upon the Niger Delta ecosystem, resulting in crop loss and severe environmental damage. Such spills exacerbate heavy metal concentration within soil due to the presence of metallic ions. The okpare-olomu community has borne the brunt of crude oil pollution from illicit bunkering, sabotage, and equipment malfunction. This study targets an evaluation of ecological hazards linked to heavy metals (HMs) in crude oil impacted agriculturally soils within okpare-olomu in Ughelli South LGA of Delta State. In this study, 24 topsoil samples were obtained from areas affected by crude oil pollution;the heavy metal content was evaluated through atomic absorption spectrometry. The concentration ranges for HMs (mg/kg) in soil were: 24.1 - 23,174 (Cu);0.54 - 37.1 (Cd);9.05 - 54 (Cr);12 - 174 (Ni);18.5 - 8611 (Pb);and 148 - 9078 (Zn) at a soil depth of 0 - 15 cm. Notably, metal concentrations were recorded to be above permissible World Health organization limits. Predominantly, Zn and Pb recorded higher heavy metal concentration when compared to other heavy metals analysed, notably at sampling points PT7 through PT24. Zinc and Pb contamination exhibited highly significant contamination factors, and contamination severity was evidenced across all sample points, signifying a grave risk level. Pollution load indices indicated pervasive extreme pollution levels. Geoaccumulation indices signaled moderate to strong pollution, mainly by Pb and Zn. Ecological risk assessments revealed variable levels of heavy metal contamination, from low to very high, with potential ecological risk reflecting markedly elevated levels. This study underscores the imperative for soil remediation to rectify ecological imbalances in agriculturally affected soil constituents.

关键词： Heavy Metals Crude oil Pollution Degree of Contamination Potential Risk Index

来源：

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

Physicochemical Properties and Health Risks of Informal E-Waste Processing at Alaba International Market in Lagos, Nigeria

引用

Journal of Geoscience and Environment Protection 2023年第9期11卷 176-202页

作者： Adedoyin olubunmi Bankole Akinyemi olufemi ogunkeyede Judith Ngoli odionye Benjamin Giwa oliver Chinonso Mbaoma Bamidele Honesty Akpeji Ekaette Akpan Fadairo efe jeffery isukuru Department of Environmental Management and Toxicology Federal University of Petroleum Resources Effurun Nigeria Department of Chemistry Federal University of Petroleum Resources Effurun Nigeria Department of Industrial Safety and Environmental Technology Petroleum Training Institute Effurun Nigeria

This study investigated the groundwater quality and health risks associated with informal e-waste processing in the Alaba International Market in Lagos, Nigeria. Twenty-two groundwater samples were collected from hand-dug wells in the market area and analyzed for physicochemical properties and heavy metal concentrations. The results showed that the groundwater quality was poor, with high levels of heavy metals, including cadmium, lead, and chromium. The health index (HI) for children and adults was above the tolerable threshold levels, indicating a potential health risk to the population. Principal component analysis and hierarchical cluster analysis were used to identify the sources of metals in groundwater, and the results showed that informal e-waste processing was a significant source of contamination. The study highlights the need for effective management strategies to mitigate the potential health risks associated with informal e-waste processing and ensure public health and environmental safety.

关键词： Groundwater-Quality Health Risks Informal E-Waste Processing Alaba International Market Nigeria

来源：

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

oN THE MoDIFIED NoNLINEAR SCHRDINGER EQUATIoN IN THE SEMICLASSICAL LIMIT:SUPERSoNIC,SUBSoNIC,AND TRANSSoNIC BEHAVIoR

引用

Acta Mathematica Scientia 2011年第6期31卷 2343-2377页

作者： jeffery C. DiFranco Peter D. Miller Benson K. Muite Department of Mathematics Seattle University Department of Mathematics University of Michigan

The purpose of this paper is to present a comparison between the modified nonlinear SchrSdinger （MNLS） equation and the focusing and defocusing variants of the （unmodified） nonlinear SchrSdinger （NLS） equation in the semiclassical limit. We describe aspects of the limiting dynamics and discuss how the nature of the dynamics is evident theoretically through inverse-scattering and noncommutative steepest descent methods. The main message is that, depending on initial data, the MNLS equation can behave either like the defocusing NLS equation, like the focusing NLS equation （in both cases the analogy is asymptotically accurate in the semiclassical limit when the NLS equation is posed with appropriately modified initial data）, or like an interesting mixture of the two. In the latter case, we identify a feature of the dynamics analogous to a sonic line in gas dynamics, a free boundary separating subsonic flow from supersonic flow.

关键词： semiclassical limits dispersionless limits modulational instability focusing,defocusing, and modified nonlinear SchrSdinger equations

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhancing conversion using diffusio-osmosis from patterned catalytic surfaces

Industrial Chemistry & Materials

引用

Industrial Chemistry & Materials 2024年第3期2卷 451-457页

作者： Aura Visan jeffery A.Wood Rob G.H.Lammertink Soft Matter Fluidics and InterfacesMESA+Institute for NanotechnologyUniversity of TwenteP.O.Box 2177500 AE EnschedeThe Netherlands

An inhomogeneous catalyst surface leads to concentration gradients along this surface,which can generate diffusio-osmotic *** magnitude of this surface flow and the extent to which it impacts the catalytic conversion is numerically investigated and depends foremost on the reaction kinetics of the system and the surface-species interactions expressed via the diffusio-osmotic *** present general scaling laws based on the reaction kinetics and interaction potential between chemical species and the catalytic surface,captured in a single *** further investigate the optimal catalyst coverage in order to maximize the benefit of these surface flows.

关键词： Diffusio-osmosis Catalysis Transport Enhancement

来源：

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

Quantitative trait loci associated with soybean seed weight and composition under different phosphorus levels

引用

Journal of Integrative Plant Biology 2018年第3期60卷 232-241页

作者： Gokhan Hacisalihoglu Amy L.Burton jeffery L.Gustin Selim Eker Safiye Asikli Elif Hakli Heybet Levent ozturk Ismail Cakmak Atilla Yazici Kent o.Burkey James orf A.Mark Settles Department of Biological Sciences Florida A&M UniversityTallahasseeFL 32307USA United States Department of Agriculture Agricultural Research ServicePlant Science Research UnitRaleighNC 27607USA Horticultural Science Department University of FloridaGainesvilleFL 32611USA Department of Soil Science&Plant Nutrition Cukurova University01330 AdanaTurkey Faculty of Engineering&Natural Sciences Sabanci University34956 IstanbulTurkey Department of Agronomy&Plant Genetics University of MinnesotaSt.PaulMN 55108USA

Seed size and composition are important traits in food crops and can be affected by nutrient availability in the soil. Phosphorus （P） is a non-renewable, essential macronutrient, and P deficiency limits soybean （G1ycine max） yield and quality. To investigate the associations of seed traits in low- and high-P environ- ments, soybean recombinant inbred lines （RILs） from a cross of cultivars Fiskeby III and Mandarin （ottawa） were grown under contrasting P availability environments. Traits including individual seed weight, seed number, and intact mature pod weight were significantly affected by soil P levels and showed transgressive segregation among the RILs. Surprisingly, P treatments did not affect seed composition or weight, suggesting that soybeanmaintains sufficient P in seeds even in Iow-P soil. Quantitative trait loci （QTLs） were detected for seed weight, intact pods, seed volume, and seed protein, with five significant QTLs identified in Iow-P environments and one significant QTL found in the optimaI-P environment. Broad-sense heritability estimates were 0.78 （individual seed weight）, *** （seed protein）, 0.34 （seed oil）, and 0.98 （seed number）. The QTLs identified under low P point to genetic regions that may be useful to improve soybean performance under limiting P conditions.

关键词： Qian Qian China National Rice Research Institute China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The double helium-white dwarf channel for the formation of AM CVn binaries

引用

Research in Astronomy and Astrophysics 2018年第1期18卷 101-112页

作者： Xian-Fei Zhang Jin-Zhong Liu C.Simon jeffery Philip D.Hall Shao-Lan Bi Department of Astronomy Beijing Normal University Xinjiang Astronomical observatory Chinese Academy of Sciences Armagh observatory and Planetarium College Hill School of Physics Trinity College Dublin

Most close double helium white dwarfs will merge within a Hubble time due to orbital decay by gravitational wave ***,a significant fraction with low mass ratios will survive for a long time as a consequence of stable mass *** stable mass transfer between two helium white dwarfs（He WDs） provides one channel for the production of AM CVn binary *** previous calculations of double He WD progenitors,the accreting He WD was treated as a point *** have computed the evolution of 16 double He WD models in order to investigate the consequences of treating the evolution of both components in *** find that the boundary between binaries having stable and unstable mass transfer is slightly modified by this *** comparing with observed periods and mass ratios,we redetermine masses of eight known AM CVn stars by our double He WDs channel,*** Cnc,AM CVn,V406 Hya,J0926,J1240,GP Com,Gaia14 aae and V396 *** propose that central spikes in the triple-peaked emission spectra of J1240,GP Com and V396 Hya and the surface abundance ratios of N/C/o in GP Com can be explained by the stable double He WD *** mass estimates derived from our calculations are used to discuss the predicted gravitational wave signal in the context of the Laser Interferometer Space Antenna（LISA） project.

关键词： stars:peculiar(helium) stars:white dwarfs binaries:close gravitational waves

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Antipoisoning catalysts for the selective oxygen reduction reaction at the interface between metal nanoparticles and the electrolyte

引用

Carbon Energy 2023年第7期5卷 57-69页

作者： Sourabh S.Chougule A.Anto jeffery Sreya Roy Chowdhury Jiho Min Yunjin Kim Keonwoo Ko Bathinapatla Sravani Namgee Jung Graduate School of Energy Science and Technology(GEST) Chungnam National UniversityYuseong-guDaejeonRepublic of Korea

one of the primary challenges in relation to phosphoric acid fuel cells is catalyst poisoning by phosphate anions that occurs at the interface between metal nanoparticles and the *** strong adsorption of phosphate anions on the catalyst surface limits the active sites for the oxygen reduction reaction(oRR),significantly deteriorating fuel cell ***,antipoisoning catalysts consisting of Pt-based nanoparticles encapsulated in an ultrathin carbon shell that can be used as a molecular sieve layer are rationally *** pore structure of the carbon shells is systematically regulated at the atomic level by high-temperature gas treatment,allowing o_(2) molecules to selectively react on the active sites of the metal nanoparticles through the molecular ***,the carbon shell,as a protective layer,effectively prevents metal dissolution from the catalyst during a long-term ***,the defect-controlled carbon shell leads to outstanding oRR activity and durability of the hybrid catalyst even in phosphoric acid electrolytes.

关键词： carbon shell catalyst poisoning effect molecular sieve effect oxygen reduction reaction phosphate anions phosphoric acid fuel cells

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：