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128篇 您的检索式:作者名="Kofi"
    题名 作者 年代 出处 被引量
1考虑容量约束的配电系统可靠性评估显示文摘提出了一种考虑线路容量约束的配电系统可靠性评估模型 ,并开发了其软件。可靠性评估通过故障影响分析实现。线路允许通过的最大电流通过直流潮流计算确定。这样 ,开发的软件既可评估全部失去连续性事件的可靠性 ,又可以评估部分失去连续性事件的可靠性。可靠性指标是 :系统平均停电频率、系统平均停电持续时间、用户平均停电频率、用户平均停电持续时间、平均供电可用率、缺供电量、平均缺供电量。经对 IEEE配电测试系统 DRTS的测试表明 ,该软件是有效、可用的。郭永基 Kofi 2000电力系统自动化2000,24,17:24
2饲草玉米不同生育期的产量、品质和青贮利用研究显示文摘对墨西哥大刍草、玉草3号和玉草6号3种不同类型饲草玉米在孕穗期、抽雄期和吐丝期的产量、青贮品质及其营养价值进行了分析。结果表明:品种和生育期对鲜、干草产量有显著影响,而二者之间的交互作用对鲜、干草产量影响不显著;3个品种鲜、干草产量均在吐丝期最高,其中,玉草6号鲜、干草产量极显著高于玉草3号和墨西哥大刍草。从抽雄期及以后,所有饲草玉米干物质(DM)含量均达20%以上,符合青贮对水分的要求。粗蛋白(CP)含量从孕穗期到吐丝期逐渐降低,变幅为8.19%DM^12.80%DM;各时期CP含量均以玉草6号最高,玉草3号和墨西哥大刍草CP含量差异较小。可溶性糖(WSC)含量在孕穗期最高,纤维含量随生育期延长均呈上升趋势。青贮发酵品质在不同生育期差异显著,孕穗期pH值为3.69,乳酸(LA)含量为7.00%DM,发酵品质最优。品种主效应分析表明,玉草6号发酵品质最好,玉草3号和墨西哥大刍草差异不显著。综合分析品种和生育期对青贮发酵品质和营养成分的影响,玉草6号在孕穗期青贮,相对饲用价值达103.28,发酵品质和营养价值最好;玉草3号和墨西哥大刍草在抽雄期青贮发酵品质和营养价值最佳。李影正 严旭 吴子周 杨春燕 李晓锋 何如钰 张萍 EBENEZER Kofi Sam 周阳 张磊 荣廷昭 何建美 唐祈林 2019草业学报2019,28,7:17
3High-efficiency,large-area,topologyoptimized metasurfaces显示文摘Metasurfaces are ultrathin optical elements that are highly promising for constructing lightweight and compact optical systems.For their practical implementation,it is imperative to maximize the metasurface efficiency.Topology optimization provides a pathway for pushing the limits of metasurface efficiency;however,topology optimization methods have been limited to the design of microscale devices due to the extensive computational resources that are required.We introduce a new strategy for optimizing large-area metasurfaces in a computationally efficient manner.By stitching together individually optimized sections of the metasurface,we can reduce the computational complexity of the optimization from high-polynomial to linear.As a proof of concept,we design and experimentally demonstrate large-area,high-numerical-aperture silicon metasurface lenses with focusing efficiencies exceeding 90%.These concepts can be generalized to the design of multifunctional,broadband diffractive optical devices and will enable the implementation of large-area,high-performance metasurfaces in practical optical systems.Thaibao Phan David Sell Evan W.Wang Sage Doshay Kofi Edee Jianji Yang Jonathan A.Fan 2019Light(Science & Applications)2019,8,1:12
4Civil and structural engineering applications,recent trends,research and developments on pultruded fiber reinforced polymer closed sections:a review显示文摘The objectives of this study are to review and evaluate the developments and applications of pultruded fiber-reinforced polymer composites in civil and structural engineering and review advances in research and developments.Several case applications are reviewed.The paper presents a state-of-the-art review of fundamental research on the behavior of pultruded fiber reinforced polymer closed sections and highlights gaps in knowledge and areas of potential further research.Alfred Kofi GAND Tak-Ming CHAN James Toby MOTTRAM 2013Frontiers of Structural and Civil Engineering2013,7,3:4
5An intrinsically bioactive hydrogel with on-demand drug release behaviors for diabetic wound healing显示文摘Prolonged,intense inflammation and excessive oxidative stress hinder diabetic wounds from healing normally,leading to disorders downstream including the postponement of re-epithelialization and extracellular matrix(ECM)formation.Herein,we report a hyaluronic acid(HA)and chitosan based hydrogel(OHA-CMC)with inherent antibacterial and hemostatic activities fabricated via Schiff base reaction.By encapsulating nanotechnologically-modified curcumin(CNP)and epidermal growth factor(EGF)into the hydrogel,OHA-CMC/CNP/EGF exhibited extraordinary antioxidant,anti-inflammatory,and migration-promoting effects in vitro.Meanwhile,OHA-CMC/CNP/EGF presented on-demand drug release in synchrony with the phases of the wound healing process.Specifically,curcumin was rapidly and constantly released to alleviate inflammation and oxidative stress in the early phase of wound healing,while a more gradual and sustained release of EGF supported late proliferation and ECM remodeling.In a diabetic full-thickness skin defect model,OHA-CMC/CNP/EGF dramatically improved wound healing with ideal re-epithelialization,granulation tissue formation,and skin appendage regeneration,highlighting the enormous therapeutic potential this biomaterial holds as a diabetic wound dressing.Bin Hu Mingzhu Gao Kofi Oti Boakye-Yiadom William Ho Wei Yu Xiaoyang Xu Xue-Qing Zhang 2021Bioactive Materials2021,6,12:4
6Fecal lactoferrin accurately reflects mucosal inflammation in inflammatory bowel disease显示文摘BACKGROUND Studies have demonstrated a potential role for fecal biomarkers such as fecal calprotectin(FC)and fecal lactoferrin(FL)in monitoring inflammatory bowel diseases(IBD)-Crohn's disease(CD)and ulcerative colitis(UC).However,their correlation to endoscopic scores,disease severity and affected intestinal surface has not been extensively investigated.AIM To correlate FL,and for comparison white blood cell(WBC)and C-reactive protein(CRP),with endoscopic scores,disease extent and location in CD and UC.METHODS Retrospective analysis in 188 patients who had FL,CRP and WBC determined within 30 d of endoscopy.Disease location,disease extent(number of intestinal segments involved),disease severity(determined by endoscopic scores),timing of FL testing in relation to colonoscopy,as well as the use of effective fast acting medications(steroids and biologics)between colonoscopy and FL measurement,were recorded.RESULTS In 131 CD and 57 UC patients,both CRP and FL-but not WBC-distinguished disease severity(inactive,mild,moderate,severe).In patients receiving fastacting(steroids or biologics)treatment in between FL and colonoscopy,FL showed a higher correlation to endoscopic scores when tested before vs after the procedure(r=0.596,P<0.001,vs r=0.285,P=0.15 for the Simple Endoscopic Score for CD;and r=0.402,P=0.01 vs r=0.054 P=0.84 for Disease Activity Index).Finally,FL was significantly correlated with the diseased mucosal surface(colon-ileocolon>small bowel)and the number of inflamed colon segments.CONCLUSION FL and CRP separated disease severity categories with FL showing lower discriminating P-values.FL showed a close correlation with the involved mucosal surface and with disease extent and was more closely correlated to endoscopy when determined before the procedure–this indicating that inflammatory activity changes associated with therapy might be rapidly reflected by FL levels.FL can accurately and timely characterize intestinal inflammation in IBD.Marrieth G Rubio Kofi Amo-Mensah James M Gray Vu Q Nguyen Sam Nakat Douglas Grider Kim Love James H Boone Dario Sorrentino 2019World Journal of Gastrointestinal Pathophysiology2019,10,5:4
7Impact of immunosuppression minimization and withdrawal in long-term hepatitis C virus liver transplant recipients显示文摘AIM:To investigate the effects of different immunosuppressive regimens and avoidance on fibrosis progression in hepatitis C virus(HCV)liver transplant(LT)recipients.METHODS:We retrospectively compared the liver biopsies of well-matched HCV LT recipients under calcineurin inhibitors(CNI group,n=21)and mycophenolate(MMF group,n=15)monotherapy,with those patients who successfully withdrawn immunosuppression(IS)therapy from at least 3 years(TOL group,n=10).To perform the well-matched analysis,all HCV transplanted patients from December 1993 were screened.Only those HCV patients who reached the following criteria were considered for the analysis:(1)at least3 years of post-operative follow-up;(2)patients with normal liver graft function under low dose CNI monotherapy(CNI group);(3)patients with normal liver graft function under antimetabolite(Micophenolate Mofetil or coated mycophenolate sodium)monotherapy(MMF group);and(4)recipients with normal liver function without any IS.We excluded from the analysis recipients who were IS free or under monotherapy for<36 mo,recipients with cirrhosis or with unstable liver function tests.RESULTS:Thirty six recipients were enrolled in the study.Demographics,clinical data,time after LT and baseline liver biopsies were comparable in the three groups.After six years of follow-up,there was no worsening of hepatic fibrosis in the MMF group(2.5±1.5Ishak Units vs 2.9±1.7 Ishak Units,P=0.5)and TOL group(2.7±10.7 vs 2.5±1.2,P=0.2).In contrast,a significant increase in the fibrosis score was observed in the CNI group(2.2±1.7 vs 3.9±1.6,P=0.008).The yearly fibrosis progression rate was significantly worse in the CNI group(0.32±0.35)vs MMF group(0.03±0.31,P=0.03),and TOL group(-0.02±0.27,P=0.02).No differences have been reported in grading scores for CNI group(2.79±1.9,P=0.7),MMF group(3.2±1.5,P=0.9)and TOL group(3.1±1.4,P=0.2).Twenty four patients were treated with low dose ribavirin(8TOL,7 MMF,9 CNI).The hepatitis C titers were comparable in the three groups.No episodes of rejection have been reported despite differences of liver function test in the three groups during the observational period.CONCLUSION:IS withdrawal and MMF monotherapy is safe and seems to be associated with the slowest fibrosis progression in HCV LT recipients.Tommaso Maria Manzia Roberta Angelico Paolo Ciano Jon Mugweru Kofi Owusu Daniele Sforza Luca Toti Giuseppe Tisone 2014World Journal of Gastroenterology2014,20,34:3
8Diagnostic accuracy of quantitative EUS elastography for discriminating malignant from benign solid pancreatic masses: a prospective, single-center study显示文摘Muhammad F. Dawwas Hatim Taha John S. Leeds Manu K. Nayar Kofi W. Oppong 2012Gastrointestinal Endoscopy2012,,5:3
9基于图像分割的驾驶员分心行为识别研究显示文摘针对驾驶员分心行为对交通安全产生隐患的问题,提出一种结合图像分割与卷积神经网络的驾驶员分心行为检测方法。该方法通过使用图像分割处理后的驾驶员不同分心行为的图像对卷积网络结构模型进行训练,来减轻背景噪声的影响,以提高模型的识别性能。试验中使用未经分割的图像与经过前景分割后图像分别训练卷积神经网络模型,用分割后图像训练的模型识别的准确率达到了93.84%,高于使用原图像训练的模型。试验结果表明,结合图像分割和深度学习的驾驶员分心行为检测方法对驾驶员的分心行为有较好的检测效果。叶绿 陈铖 Sugianto Sugianto Chido Natasha Muponda Agordzo George Kofi Koi David Ernest 2020浙江科技学院学报2020,32,3:2
10'Conpensafion of Packaging Asyrmetry in a 2-D Wind Sensor' 显示文摘Matova S P Kofi A A Makinwa 2003IEEE Sensor Journal2003,3,6:1
11Carbon dioxide emissions, economic growth ,industrial struc- ture and technical efficiency:empirical evidence from Ghana,Sen- egal and Morocco on the causal dynamics显示文摘Philip Kofi Adorn William Bekoe Franklin Amuakwa - Mensah 2012Energy2012,,1:1
12Dadzie,Evelyn Winston,Consumer response to Stock-out in the online Supply chain显示文摘Kofi Q 0,,:1
13How Much Extra Affordable Housing is Needed in England?显示文摘Glen Bramley Noah Kofi Karley 2005Housing Studies2005,,5:1
14HucMSC-Ex alleviates inflammatory bowel disease via the lnc78583-mediated miR3202/HOXB13 pathway显示文摘As a group of nonspecific inflammatory diseases affecting the intestine,inflammatory bowel disease(IBD)exhibits the characteristics of chronic recurring inflammation,and was proven to be increasing in incidence(Kaplan,2015).IBD induced by genetic background,environmental changes,immune functions,microbial composition,and toxin exposures(Sasson et al.,2021)primarily includes ulcerative colitis(UC)and Crohn's disease(CD)with complicated clinical symptoms featured by abdominal pain,diarrhea,and even blood in stools(Fan et al.,2021;Huang et al.,2021).Yuting XU Li ZHANG Dickson Kofi Wiredu OCANSEY Bo WANG Yilin HOU Rong MEI Yongmin YAN Xu ZHANG Zhaoyang ZHANG Fei MAO 2022Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)2022,23,5:1
15Mucoepidermoid Carcinoma of the Parotid Gland:The Mayo Clinic Experience显示文摘Derek Kofi O Boahene Kerry D 2004Arch Otolaryngol Head NeckSurg2004,130,:1
16Type 2 diabetes control and complications in specialised diabetes care centres of six sub-Saharan African countries: The Diabcare Africa study显示文摘Eugene Sobngwi Maimouna Ndour-Mbaye Kofi A. Boateng Kaushik L. Ramaiya Eva W. Njenga Said N. Diop Jean-Claude Mbanya Augustine E. Ohwovoriole 2011Diabetes Research and Clinical Practice2011,,1:1
17Crystallization behavior and viscoelasticity of bamboo-fiber composites显示文摘Kofi Y Kitagawa K Hamada H 2005Journal of Applied Polymer Science2005,98,2:1
18Multiple-ramp column-parallel ADC architec- tures for CMOS image sensors显示文摘Martijn F Snoeij Albert J P Theuwissen Kofi A A Makinwa 2007IEEE Journal Of Solid-State Circuits2007,42,12:1
19Wear rate of animal-drawn ploughshares in selected Ghanaian soils显示文摘Emmanuel Y H Bobobee Kofi Sraku-Lartey 0,,93:1
20Book review: empire of capital显示文摘Kofi Ankomah 2003The Human Nature Review2003,,3:1
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