检索结果-南通市图书馆

Journal of Modern Physics 2013年第8期4卷 1119-1122页

作者： amos S. Kubeka Department of Mathematical Sciences University of South Africa Pretoria South Africa

We correct from the previous paper: the first, second and third order derivatives of the Bondi metric function J at the ISCO of the binary system consisting of a Schwarzschild black hole and a point particle. Previously, these derivatives where not correctly determined and that resulted in the incorrect determination of the emitted gravitational radiation at null infinity. The now correctly calculated gravitational radiation is now in full agreement with that obtained by the standard 5.5 PN formalism to about ninety eight percent. The small percentage difference observed is due to the slow convergence property of the PN formalism as compared to the null cone formalism, otherwise the results are basically the same.

关键词： Black Hole Particle Gravitational Radiation Null Infinity

Critical relative indentation depth in carbon based thin films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2014年第3期24卷 287-290页

作者： Ruben Bartali Alessandro Vaccari Victor Micheli Gloria Gottardi Rajesh Pandiyan amos Collini Paolo Lori Gianni Coser Nadhira Laidani Fondazione Bruno Kessler - Ricerca Scientifica e Tecnologica Center for Materials and Microsystems Fondazione Bruno Kessler – Ricerca Scientifica e Tecnologica Center for Materials and Microsystems

The thin film hardness estimation by nanoindentation is influenced by substrate beyond a critical relative indentation depth(CRID). In this study we developed a methodology to identify the CRID in amorphous carbon film. Three types of amorphous carbon film deposited on silicon have been studied. The nanoindentation tests were carried out applying a 0.1–10 mN load range on a Berkovich diamond tip, leading to penetration depth-to-film thickness ratios of 8–100%. The work regained during unloading(We) and the work performed during loading(Wt) was estimated for each indentation. The trend of unload-to-load ratio(We/Wt) data as a function of depth has been studied. We/Wtdepth profiles showed a sigmoid trend and the data were fitted by means of a Hill sigmoid equation. Using Hill sigmoid fit and a simple analytical method it is possible to estimate CRID of carbon based films.

关键词： Nanoindentation Carbon film Critical relative indentation depth We/Wt

The Equality–Inequality Dialectics

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Philosophy Study 2020年第6期10卷 337-346页

作者： amos AvnyOmnidev International Yehud Israel 不详

The assay argues that the Equality-Inequality dialectics is a very complex issue,which reflects many social *** one side are the state official commitments to secure,maintain and protect all kinds of formal *** the other side are the natural and genetic distinctions that differ between human-beings while creating and maintaining *** fact,this is kind of a contradiction exists in many fields of social *** essay’s author reviews some of the relevant historical events,such as social mobility,individualism and education and points out on future *** the proposed suggestions are:1)Embracing Frankl’s giving“Meaning to Life”as a leverage for increasing pleasure of life;2)Recognizing and promoting Creative Individualism as the legitimized ground for inequality;3)Increasing Social Cohesion,required for social empowerment and attaining security and happiness.

关键词： equality and inequality social mobility educational inequality capitalist egotism creative individualism meaning of life

Antimalarial potency of the leaf extract of Aspilia africana(Pers.) ***

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2012年第2期5卷 126-129页

作者： Akuodor Godwin Christian amos Grace Mfon Essien Augustine Dick Essien David-Oku Akpan Joseph Linus Ezeokpo Basil Chukwuma Department Pharmacology College of Medical SciencesUniversity of CalabarNigeria Department of Pharmacology and Toxicology National Institute for Pharmaceutical Research and Development(NIPRD)AbujaNigeria Department of Biochemistry College of Medical SciencesUniversity of CalabarNigeria Department of Pharmacology and Therapeutics Faculty of Clinical MedicineEbonyi State UniversityAbakalikiNigeria

Objective:To investigate the antimalarial activity of ethanol extract of Aspilin africana (***) ***:The ethanol extract of *** leaf(100-400 mg/kg) was screened for blood schizonticidal effect against chloroquine-sensitive Plasmodium berghei(P. berghei) in mice both in early and established models of antimalarial ***:The leaf extract exhibited significant(P<0.05) antiplasmodial activity in 4-day early infection and in established infection tests with a considerable mean survival time comparable to that of standard drug,chloroquine(10 mg/kg).Conclusions:The findings show thai ethanol extract of *** leaf possesses potent antiplasmodial activity which justify the use in ethnomedicine and can be developed in malaria therapy.

关键词： Aspilia africana Herbal medicine Plasmodium berghei Mice

Drought Impacts on Community Livelihoods in the Upper Ewaso Ng’iro Basin, Kenya

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 Geoscience and Environment Protection 2023年第12期11卷 81-96页

作者： Bancy Mati amos Karithi June Kimaiyo School of Biosystems and Environmental Engineering Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya Community Development Meru Kenya

Drought is the most common of all natural disasters in Kenya, in terms of the large areas covered, populations adversely affected and socio-economic impacts. The Upper Ewaso Ng’iro Basin of Kenya is a drought-prone zone, lying on the lee slopes of both Mt. Kenya and Aberdares range. This study sought to determine opinions of communities on drought and its impacts on their livelihoods. Baseline data were collected from published reports and literature reviews augmented with information gathered through interviews with communities and key informants. Field data were collected mainly in the three counties of Laikipia, Isiolo and Meru, utilizing semi-structured questionnaire surveys. A total of 187 respondents were interviewed of which 150 were community members and 37 were policy makers. The typologies of community respondents interviewed included small-scale farmers, large commercial farmers, pastoralists, conservancies, water user associations and conservation groups. It was found that drought is a serious disaster in the Upper Ewaso Ng’iro basin, which has been escalating. Communities experienced negative impacts of drought, with the biggest problem being water scarcity, closely followed by food and fodder shortages and poor incomes from farming. Other problems include spikes in livestock theft, loss of livestock from diseases and shortage of pasture. Conflicts over water and pasture escalate during droughts and crime increases due to lack of on-farm employment opportunities. Since drought events are natural phenomena expected to happen any time, there is need to identify how to improve local capacities in drought preparedness, adaptation and resilience.

关键词： Drought Impacts Communities Livelihoods Laikipia Isiolo Meru Kenya

Benefits of Reducing Air Emissions: Replacing Conventional with Electric Passenger Vehicles

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 Environmental Protection 2013年第10期4卷 1035-1043页

作者： Ofira Ayalon Bernanda Flicstein amos Shtibelman Natural Resource & Environmental Research Center University of Haifa Haifa Israel.

The study estimated the cost of local and global air emissions, and to compare the differences between electric passenger vehicles (EV) and conventional, internal combustion engine (ICE) vehicles. The air emissions were estimated for the year 2020, for Denmark, France and Israel, because of their significantly different fuel mixes to produce electricity—a high percentage of renewable energy, mainly nuclear energy and high fossil fuels, respectively. Air emissions from electricity production and conventional traffic were calculated for each country and then multiplied by the specific country’s cost of emissions. Subtracting the total cost of electricity production from the total cost of conventional transportation yields the total benefit for each of the economies studied. The environmental benefit, depending on EV penetration rates, was found to be in the range of 7.8 to 133 MEUR/year for Denmark, 94 to1948 MEUR/year for France and only 4 to 82 MEUR/year for Israel, whose energy mix is the most polluting. Our analysis also shows higher potential benefits when replacing passenger car fleets comprising a high percentage of diesel cars with EVs, as well as in highly populated areas. In addition, we quantified the differences between EVs with fixed batteries and the new switch able battery concept (EASYBAT), as part of the EU 7th Framework Program me. The additional electricity demands for the EASYBAT concept are negligible, and therefore, do not change the overall conclusion that the cleaner the electricity energy mix and the higher the penetration of EVs, the higher the environmental benefits achieved.

关键词： Air Emissions Electric Vehicles Passenger Car Externalities Power Generation Externalities Battery-Switch EASYBAT EU FP7

The Cost of Plastic Pollution in N’Djamena: A Case Study

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 Environmental Protection 2022年第8期13卷 575-588页

作者： Lelia Croitoru amos Singambaye Aurélie Rossignol World Bank Group Washington DC USA World Bank Group N’Djamena Chad

Plastic pollution is a major problem: it damages health, reduces ecosystem services, and affects local economies. Despite its importance, available valuation efforts have focused primarily on the damages caused by plastic in marine environments. Far less is known about the effects of plastic waste in inland settings. This paper addresses this gap by estimating in monetary terms the damages caused by the inappropriate disposal of plastic waste in an inland context. The study area is located along a canal that crosses N’Djamena, the capital of Chad. Using data from a primary survey and applying standard valuation techniques, the paper estimates the social cost of plastic pollution at over USD3000 per ton in 2020. In addition, it shows that the impacts of plastic waste vary significantly across the study area: households residing within 20 meters of the canal bear more than 75 percent of the total damages. The paper identifies the main valuation challenges and proposes recommendations to reduce plastic waste damages.

关键词： Solid Waste Plastic Pollution Economic Cost

Design of a Low-Cost Underwater LED Fishing Light Attractor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Circuits and Systems 2018年第4期9卷 67-73页

作者： Geophrey Telemka Mariana Mghamba amos Ntarisa Mkwawa University College of Education Iringa Tanzania

Fishermen generally use light as a common way to attract fish in the fishing industry. This study aimed to design a model of an underwater fishing using Light Emitting Diode (LED) lamp which is less costful and suitable for fishermen of Tanzania. Most fishermen currently use kerosene based lamps like candela which consumes lots of energy leading to high cost in terms of money used to regenerate the energy. This running cost automatically rises up the price of fish in the market. Thus with the use of LED lamp the cost will be reduced. The findings from this study showed that the LED lamp consumes little amount of energy (energy saving) compared to candela lamp which consumes 6 liters of kerosene per 36 hours which is equivalent to three nights, while the LED lamp takes 7 batteries at once for 36 hours. The 6 liters of kerosene cost around 7 USD and that of 7 batteries cost is near 2 USD. The LED lamp can be accessed by only 15 USD the price which is nearly half the price of the candela lamp. The candela lamp in the market is sold around 31 USD. This shows that LED lamp is more efficient in terms of conserving energy and cost effective than candela lamp. It is recommended that fishermen in the fishing industry in Tanzania should employ the usage of underwater LED fishing lamps as they are energy efficient. This will help the fishermen of Tanzania to undertake the fishing activity at low cost which will result to the decrease of price of fish in the market. This shows that this LED lamp has high efficiency and effectiveness to be used by fishermen compared to traditional method used by majority of them.

关键词： Underwater Fishing Lamp LED Light Emitting Diode Fishermen Fishing Light Attractor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

枯竭老油田采油的地震监测和岩石物性研究

国外油气勘探 1994年第3期6卷 317-325页

作者： amos Nur Li Fang 美国斯坦福大学美国油藏地学公司美国劳雷工业公司美国乔美特利物探仪器公司

老油田上产新油的主攻目标是油田的可采油量与不可采油量(由于残留饱和度)之间的巨大差距。造成这种差距的主要原因是诸如油藏渗透率、孔隙压力、饱和度及压缩系数的不均匀分布。为描述这些不均匀分布,以岩石物性为解释基础的地震勘探... 详细信息

老油田上产新油的主攻目标是油田的可采油量与不可采油量(由于残留饱和度)之间的巨大差距。造成这种差距的主要原因是诸如油藏渗透率、孔隙压力、饱和度及压缩系数的不均匀分布。为描述这些不均匀分布,以岩石物性为解释基础的地震勘探显然是合适的方法。当前,结合岩石物性研究,地震方法体现为两种不同的用途:1)油藏描述;2)采油监测。油藏描述提供我们开采前油藏中流体流动的不均匀分布情况。采油监测通过重复地震观测,记录地震数据变化。这些变化是由于采油过程中地下流体压力或组份变化所造成的。用孔隙压力,流体及其温度的变化解释地震数据变化,对认识岩石当前的物理状态非常有用。因此该种监测必将成为采油管理、特别是在对非均匀油藏注水和蒸汽采油管理的关键技术。

关键词：油藏描述含油饱和度非均质油藏

Genome-wide association mapping and genomic prediction of stalk rot in two mid-altitude tropical maize populations

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 Crop Journal 2024年第2期12卷 558-568页

作者： Junqiao Song Angela Pacheco amos Alakonya Andrea S.Cruz-Morales Carlos Muoz-Zavala Jingtao Qu Chunping Wang Xuecai Zhang Felix San Vicente Thanda Dhliwayo College of Agronomy Henan University of Science and TechnologyLuoyang 471000HenanChina International Maize and Wheat Improvement Center(CIMMYT) El BatanMexico Anyang Academy of Agricultural Sciences Anyang 455000HenanChina CIMMYT-China Specialty Maize Research Center Crop Breedingand Cultivation Research InstituteShanghai Academy of Agricultural SciencesShanghai 201403China

Maize stalk rot reduces grain yield and *** about the genetics of resistance to maize stalk rot could help breeders design effective breeding strategies for the *** prediction may be a more effective breeding strategy for stalk-rot resistance than marker-assisted *** performed a genome-wide association study(GWAS)and genomic prediction of resistance in testcross hybrids of 677 inbred lines from the Tuxpe?o and non-Tuxpe?o heterotic pools grown in three environments and genotyped with 200,681 single-nucleotide polymorphisms(SNPs).Eighteen SNPs associated with stalk rot shared genomic regions with gene families previously associated with plant biotic and abiotic *** favorable SNP haplotypes traced to tropical than to temperate progenitors of the inbred *** genotype-by-environment(G×E)interaction increased genomic prediction accuracy.

关键词： Maize stalk rot Genome-wide association mapping Haplotype analysis Genomic prediction G×E interaction