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超声波与EDTA联用对污染土中Pb的去除效果及其作用机理

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环境工程学报 2015年第7期9卷 3492-3496页

作者：张春雷费小通程成 Osei anokye Obed 河海大学环境学院南京210098

以人工配置的Pb污染土为对象,进行了超声波与EDTA单独及联合作用对污染土中Pb的去除实验,利用改进BCR法测定了不同作用下土中Pb的4种形态。结果表明,超声波单独作用时对土中Pb的去除率很低,EDTA单独作用时去除率可以达到55%~90%。二者... 详细信息

以人工配置的Pb污染土为对象,进行了超声波与EDTA单独及联合作用对污染土中Pb的去除实验,利用改进BCR法测定了不同作用下土中Pb的4种形态。结果表明,超声波单独作用时对土中Pb的去除率很低,EDTA单独作用时去除率可以达到55%~90%。二者联合作用下,可以明显缩短EDTA单独去除反应的时间、节省EDTA用量并增强去除效果。超声波与EDTA联用增强Pb去除的机理,可以被认为是超声波促进了土中残渣态的Pb向弱酸提取态（F1）和可还原态（F2）转化,而EDTA能够去除的Pb形态主要是F1和F2。对于实验土中Pb的去除来说,EDTA清洗起主导作用,超声波起加速和加强作用。

关键词：超声波 EDTA Pb 污染土去除重金属形态

Effect of Variety and Plant Spacing on Growth and Yield of Groundnuts (Arachis hypogaea L.)

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Computed Tomography Protocol Optimisation for Pediatric Head Trauma: Radiation Dose and Image Quality Assessment

Agricultural Sciences（农业科学） 2024年第1期

作者： Abukari Iddrisu Eric Adjei Samuel Kwesi Asomaning Kwadwo Gyasi Santo Adu Poku Isaac Alexander Danson-anokye

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2022年第3期11卷 160-175页

作者： Evelyn Anaafi Mary Boadu Albertina Rusandu Mercy Afadzi Kwame anokye Amoabeng Department of Medical Physics Graduate School of Nuclear and Allied Sciences University of Ghana Legon Sweden-Ghana Medical Center Accra Ghana Department of Circulation and Medical Imaging Norwegian University of Science and Technology (NTNU) Trondheim Norway Department of Physics Norwegian University of Science and Technology (NTNU) Trondheim Norway National Centre for Radiotherapy and Nuclear Medicine Korlebu Teaching Hospital Accra Ghana

Purpose: Children are sometimes examined with Computed Tomography protocols designed for adults, leading to radiation doses higher than necessary. Lack of optimisation could lead to image quality higher than what is needed for diagnostic purposes with associated high doses to patients. Optimising the protocols for paediatric head trauma CT imaging will reduce radiation dose. Objective: The study aimed to optimise radiation dose and assess the image quality for a set of protocols by evaluating noise, a contrast to noise ratio, modulation transfer function and noise power spectrum. Methods: Somaton Sensation 64 was used to scan the head of an anthropomorphic phantom with a set of protocols. ImageJ software was used to analyse the paediatric head image from the scanner. IMPACTSCAN dosimeter software was used to evaluate the radiation dose to the various organs in the head. MATLAB was used to analyse the Modulation Transfer Function and the Noise Power. Results: The estimated Computed Tomography Dose Index volume (CTDIvol) increased with increasing tube current and tube voltage. The high pitch of 0.9 gave a lower dose than the 0.5 pitch. The eye lens received the highest radiation dose (39.2 mGy) whiles the thyroid received the least radiation dose (13.7 mGy). There was an increase in noise (62.46) when the H60 kernel was used and a lower noise (8.829) was noticed when the H30 kernel was used. Conclusion: The results obtained show that the H30 kernel (smooth kernel) gave higher values for noise and contrast to noise ratio (CNR) than the H60 kernel (sharp kernel). The H60 kernel produced high values for the modulation transfer function (MTF) and noise power spectrum (NPS). The eye lens received the highest radiation dose.

关键词： Image Quality Radiation Dose Modulation Transfer Function Noise Power Spectrum Optimization

A Survey on Machine Learning Based Proactive Caching

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ZTE Communications 2019年第4期17卷 46-55页

作者： Stephen anokye Mohammed SEID SUN Guolin University of Electronic Science and Technology of China ChengduSichuan 611731China University of Mines and Technology Tarkwa 237Ghana Dilla University DillaEthiopia

The world today is experiencing an enormous increase in data traffic,coupled with demand for greater quality of experience(QoE)and *** mobile traffic leads to congestion of backhaul *** promising solution to this problem is the mo bile edge network(MEN)and consequently mobile edge *** this paper,a survey of mobile edge caching using machine learning is *** though a lot of work and sur veys have been conducted on mobile edge caching,our efforts in this paper are rather focused on the survey of machine learning based mobile edge *** affecting edge caching,such as caching entities,caching policies and caching algorithms,are *** ma chine learning algorithms applied to edge caching are reviewed followed by a discussion on the challenges and future works in this *** survey shows that edge caching can reduce delay and subsequently the backhaul traffic of the network;most caching is conducted at the small base stations(SBSs)and caching at unmanned aerial vehicles(UAVs)is recently used to accommodate mobile users who dissociate from *** survey also demonstrates that machine learning approach is the state of the art and reinforcement learning is predominant.

关键词： mobile edge caching reinforcement learning unmanned aerial vehicle

Analysis of Precipitation Trends and Prediction in Selected Cities in the Southeast Louisiana

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Garden Egg (Solanum melongena L.) Performance under Different Sources of Animal Manure as a Sustainable Alternative Fertilizer for Farmers

Atmospheric and Climate Sciences（大气和气候科学） 2022年第4期

作者： yaw a.twumasi john b.namwamba zhu h.ning edmund c.merem priscilla m.loh abena b.asare-ansah jacob b.annan ronald okwemba harriet b.yeboah caroline y.apraku janeth mjema rechael n.d.armah matilda anokye lucinda a.kangwana judith oppong julia atayi cynthia c.ogbu opeyemi i.oladigbolu diana b.frimpong joyce mcclendon-peralta

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Agricultural Sciences 2023年第8期14卷 1053-1067页

作者： Eric Adjei Kwadwo Gyasi Santo Isaac Adu Poku Danson-anokye Alexander Adwoa Oforiwa Antwi Department of Agriculture Berekum East Municipal Assembly Berekum Ghana School of Agriculture and Technology University of Energy and Natural Resources Sunyani Ghana Glenn High School Winston Salem NC USA The University of Environment and Sustainable Development Somanya Ghana

To ensure food security, continuous intensive farming systems with limited fallowing periods and other farming systems like crop rotation have led to poor soil health with extremely low organic matter, especially in tropical regions with high organic matter mineralization. Small-scale farmers in developing countries cannot afford intensive agricultural systems with heavy chemical inputs, which have not improved soil health. Inorganic fertilizers are harmful to the environment, so farmers should use cheap, locally available organic fertilizers like animal manure, which supports organic agricultural systems and soil health. Animal manure is used as a soil amendment to improve soil health, fertility, and crop yields, but data on how different manures affect specific crops is scarce. Poultry, cattle, and goat manure were compared to no fertilizer and mineral fertilizer on garden egg phenology, vegetative growth, and yield. Poultry manure improved garden egg vegetative growth, phenology, yield, and yield components compared to the negative control and the other treatments. Poultry manure yielded the most fruit at 0.921 kg∙ha-1, followed by cattle and goat manure at 0.709 kg∙ha-1 and 0.698 kg∙ha-1. In conclusion, poultry manure may be a better alternative to synthetic NPK with yield performance similar to garden eggs and long-term soil health benefits similar to other manure sources.

关键词： Garden Eggs Ghana Organic Manure Plant Phenology Sustainability

Flood Mapping in Mozambique Using Copernicus Sentinel-2 Satellite Data

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Assessment of Monitor Units and Gamma Pass Rate for 6 MV and Flattening Filter Free (FFF) Beams in Volumetric Modulated Arc Therapy (VMAT)

Advances in Remote Sensing（遥感技术进展） 2022年第3期

作者： yaw a. twumasi edmund c. merem john b. namwamba abena b. asare-ansah jacob b. annan zhu h. ning rechael n. d. armah caroline y. apraku harriet b. yeboah julia atayi matilda anokye diana b. frimpong ronald okwemba olipa s. mwakimi judith oppong brilliant m. petja janeth mjema priscilla m. loh lucinda a. kangwana valentine jeruto leah wangari njeri joyce mcclendon-peralta

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2023年第1期12卷 1-8页

作者： Kwame anokye Amoabeng Anne Beate Langeland Marthinsen Francis Hasford Samuel Nii Adu Tagoe Evelyn Anaafi Mark Pokoo-Aikins Theresa Bebaaku Dery The Cancer Center Nassau Bahamas Department of Radiotherapy St. Olav’s University Hospital Trondheim Norway Department of Medical Physics Graduate School of Nuclear and Allied Sciences University of Ghana Accra Ghana National Centre for Radiotherapy and Nuclear Medicine Korle Bu Teaching Hospital Accra Ghana

Background: In linear accelerators, the treatment field’s uniform intensity is achieved by including a flattening filter in the beam. However, to produce more conformal dose distributions, contemporary radiotherapy practice now frequently uses fluence and aperture modifying techniques, such as volumetric modulated arc therapy. In these circumstances, the flattening filter in the beam manufacturing process is no longer required. It is therefore necessary to compare the monitor units of 6 MV and flattening filter free plans and how it influences the gamma pass rates to determine which is best for treating cervical cancer with pelvic lymph node metastasis. Methods: VMAT plans for fifteen patients with cervical cancer with pathological pelvic lymph node metastasis were included in this study. Each patient had two VMAT plans using conventional 6 MV beam with flattening filter and one with flattening filter free beam (FFF). The VMAT plans were made using two arcs, and then recalculated to give the planned dose distribution to the detectors in a Delta4 phantom. The VMAT plans were irradiated on the Delta4 phantom using an Elekta linear accelerator (6 MV). Results: The mean monitor unit for the 6 MV plans was 506.3 MU and a standard deviation of 48.6 while that of the FFF plans had a mean MU of 701.5 with a standard deviation of 87.6. The total monitor units (MUs) for the FFF plans were significantly greater than the 6 MV plans (p = 6.1 × 10-5). Conclusion: Flattening filter free (FFF) plans require more numbers of monitor units in comparison to conventional 6 MV filtered beams for external radiation of cervical cancer with pelvic lymph nodes involvement.

关键词： Monitor Units Gamma Pass Rate Flattening Filter Free Multileaf Collimator

Screening of Anti-Infectives against Leishmania donovani

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Advances in Microbiology 2016年第1期6卷 13-22页

作者： Henry Nettey Grace Lovia Allotey-Babington Benoit Banga Nguessan Barima Afrane Mustafa Tagoe anokye Ababio Patience Botchway Yvonne Darko Clement Sasu Alexander Nyarko School of Pharmacy University of Ghana Legon Ghana School of Pharmacy Mercer University Atlanta GA USA

Aim: To evaluate in vitro the effectiveness of several anti-infective agents alone and in combination against Leishmania donovani. Method: A convenient stratified sampling method was used to obtain selected anti-infective agents. For individual drug samples, Half Maximal Inhibitory Concentrations (IC50) were obtained using the broth dilution method. The IC50’s of the drugs which were active against L. donovani were used as reference values to prepare drug combinations for the modified microdilution checkerboard method. Results: Five (5) out of the fifty-six (56) drugs used showed activity (inhibition of cell growth) against L. donovani cells. They include Quinine sulphate (IC50 = 0.089 μg/ml), gentamicin (IC50 = 8.1 μg/ml), amodiaquine (IC50 = 138 μg/ml) and the two standard drugs: Amphotericin B (IC50 = 6.3 μg/ml) and Pentamidine (IC50 = 25 μg/ml). The remaining fifty-one (51) drugs did not show any inhibition within the range of concentrations used (1.25 - 160 μg/ml). The drug combinations of Pentamidine/Amodiaquine, Pentamidine/ Quinine sulphate, Pentamidine/Gentamicin, Amphotericin B/Quinine Sulphate, Amphotericin B/ Gentamicin, Amodiaquine/Quinine sulphate and Amodiaquine/Gentamicin showed synergistic effects against L. donovani whereas the Amphotericin B/Amodiaquine combination was antagonistic. Notable in the results obtained was the high effectiveness of quinine sulphate in inhibiting the growth of L. donovani. Quinine sulphate, though not indicated for leishmania treatment, was more effective than the two standard drugs and has a potential of playing a significant role in the treatment of leishmaniasis. Conclusion: This study has revealed five (5) anti-infective agents that by themselves or in combinations show activity against L. donovani. Some of the drug combinations which showed synergism should further be investigated. These results have to be confirmed by in vivo studies to d

关键词： Anti-Infectives Half Maximal Inhibitory Concentration Leishmania donovani