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Passively Q-switched femtosecond-laser-written thulium waveguide laser based on evanescent field interaction with carbon nanotubes

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Photonics Research 2018年第10期6卷 971-980页

作者： esrom kifle PAVEL LOIKO JAVIER RODRíGUEZ VáZQUEZ DE ALDANA CAROLINA ROMERO AIRáN RóDENAS SUN YUNG CHOI JI EUN BAE FABIAN ROTERMUND VIKTOR ZAKHAROV ANDREY VENIAMINOV MAGDALENA AGUILó FRANCESC DíAZ UWE GRIEBNER VALENTIN PETROV XAVIER MATEOS Universitat Rovira i Virgili Departament Quimica Fisica i Inorgànica Fisica i Cristal·lografia de Materials i Nanomaterials (FiCMA-FiCNA)-EMaS Campus Sescelades E-43007 Tarragona Spain ITMO University 49 Kronverkskiy pr. 197101 St. Petersburg Russia Aplicaciones del Láser y Fotónica University of Salamanca 37008 Salamanca Spain Istituto di Fotonica e Nanotecnologie Consiglio Nazionale delle Ricerche (IFN-CNR) Piazza Leonardo da Vinci 32 20133 Milano Italy Department of Physics KAIST 291 Daehak-ro Yuseong-gu 34141 Daejeon South Korea Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Max-Bom-Str. 2a D-12489 Berlin Germany

Surface channel waveguides(WGs) were fabricated in a monoclinic Tm^(3+):KLu(WO_4)_2 crystal by femtosecond direct laser writing(fs-DLW). The WGs consisted of a half-ring cladding with diameters of 50 and 60 μm located just beneath the crystal surface. They were characterized by confocal laser microscopy and μ-Raman spectroscopy,indicating a reduced crystallinity and stress-induced birefringence of the WG cladding. In continuous-wave(CW)mode, under Ti:sapphire laser pumping at 802 nm, the maximum output power reached 171.1 mW at 1847.4 nm,corresponding to a slope efficiency η of 37.8% for the 60 μm diameter WG. The WG propagation loss was0.7 0.3 d B∕cm. The top surface of the WGs was spin-coated by a polymethyl methacrylate film containing randomly oriented(spaghetti-like) arc-discharge single-walled carbon nanotubes serving as a saturable absorber based on evanescent field coupling. Stable passively Q-switched(PQS) operation was achieved. The PQS60 μm diameter WG laser generated a record output power of 150 m W at 1846.8 nm with η = 34.6%. The conversion efficiency with respect to the CW mode was 87.6%. The best pulse characteristics(energy/duration)were 105.6 nJ/98 ns at a repetition rate of 1.42 MHz.

关键词：激光技术波导技术发展现状通讯技术

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Traceless photodegradable polymer cocoons for universal protein delivery and light-controlled gene editing

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Science China Chemistry 2024年第2期67卷 664-676页

作者： Huaibin Yu Meron Tsegay kifle Lili Chen Feihong Xiong Yan Zhang Shangbang Gao Wei Hou Shuliang Chen Weining Zhao Yuzhou Wu Hubei Engineering Research Center for Biomaterials and Medical Protective Materials Hubei Key Laboratory of Bioinorganic Chemistry&Materia MedicaKey Laboratory of Material Chemistry for Energy Conversion and StorageMinistry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan430074China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou450000China College of Life Science and Technology Huazhong University of Science and Technology(HUST)Wuhan430074China Institute of Medical Virology School of Basic Medical SciencesWuhan UniversityWuhan430071China College of Pharmacy Shenzhen Technology UniversityShenzhen518118China

Polymer conjugation was found highly valuable in clinic to improve the bioavailability of protein ***,it is still a tremendous challenge to achieve a complete release of original proteins from the conjugated hybrid under external stimulus to recover active proteins in the targeted ***,we report a general light-controlled protein delivery methodology by weaving a photodegradable polymer cocoon around proteins,which could reliably protect them from degradation in the dark while efficiently releasing them under illumination without any residual *** surface charge of the polymer shell is easily tunable to facilitate efficient cell *** versatility of this strategy is demonstrated by the delivery of the Cas9/sg RNA complex that realized light-controlled gene editing both in vitro and in vivo,and such repertoire is of particular value in regard to minimizing the off-target toxicity of CRISPR-Cas9-based gene therapy.

关键词： photodegradable polymer-protein conjugate protein delivery light control gene editing

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Nutritional, health benefits and toxicity of underutilized garden cress seeds and its functional food products: a review

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Food Production, Processing and Nutrition 2022年第1期4卷 420-432页

作者： Meseret Azene kifle Habte Helen Tkuwab Center for Food Science and Nutrition Addis Ababa UniversityP.O.Box:1176Addis AbabaEthiopia Ethiopian Public Health Institute Food Science and Nutrition Research DirectorateP.O.Box:1242Addis AbabaEthiopia Mekelle University MekelleEthiopia

Garden cress seed is a potential source of macro and micronutrients including essential fatty acids and amino acids as well as minerals such as iron, potassium, calcium and phosphorus. The seed also provides appreciable amount of health-protective bioactive compounds used to treat diabetes, hypercholesterolemia, bone fracture, asthma, constipation and some forms of cancer. Besides,, it is used to develop functional foods of therapeutic value in food manufacturing industries and traditional food preparations. Even though, it is known for its superior health benefits, provision of essential nutrients, and wider application in functional food development it is among the most underutilized crop in the world. Additionally, majority of studies conducted on garden cress seeds are mainly animal trials and hence needs to conduct studies on human. Therefore, the aim of this review paper is to provide up to date research evidence on the nutrient composition and therapeutic use of underutilized garden cress seeds and its functional food products, promising for the prevention of non-communicable and communicable diseases.

关键词： Garden cress seeds Lepidium sativum L. Underutilized Phytochemicals Therapeutic value Chronic and infectious disease Functional foods

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Screening and evaluation for antibiosis resistance of the spring wheat accessions to the grain aphid,Sitobion miscanthi(Takahashi)(Hemiptera:Aphididae)

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Journal of Integrative Agriculture 2022年第8期21卷 2329-2344页

作者： kifle Gebreegziabiher GEBRETSADIK ZHANG Yong CHEN Ju-lian State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China Tigray Agricultural Research Institute Mekelle 492Ethiopia

Resistant cultivar deployment is an effective method for cereal aphid *** greenhouse conditions,preliminary antibiosis resistance screening was conducted on 114 Ethiopian and 22 Chinese spring wheat *** performing a bioassay to determine antibiosis resistance,aphid feeding behaviour and phenolic acid content analyses were performed on the aphid resistant wheat accessions by electrical penetration graph(EPG)and high performance liquid chromatography(HPLC),*** the wheat accessions,two high resistances,27moderate-resistances,and 35 low-resistances to Sitobion miscanthi were *** antibiosis resistance test showed prolonged pre-adult and pre-reproductive periods,shorter reproductive periods,lower fecundity,an intrinsic rate(rm)of increase,and a finite rate(λ)of increase of *** on Lunxuan 145,Wane,Lunxuan 6,204511,Lunxuan 103and 5215 than those on the aphid-susceptible accession Beijing *** changes for the parameters of aphid feeding behaviour,including spending a longer time in the penetration and phloem salivation phases and less time in the phloem sap-feeding phase on the resistant wheat accessions,indicated that the aphid resistance may occur during the phloem phase and may be due to difficulties in the mechanical probing of the mesophyll ***,the HPLC analysis showed higher contents of:1)ferulic acid in Lunxuan 145,Lunxuan 103 and Lunxuan 6;2)p-coumaric acid in Lunxuan145;3)vanillic acid in Lunxuan 145,Wane and Lunxuan 6;4)syringic acid in Lunxuan 103;and 5)caffeic acid in *** contents of some phenolic acids within wheat leaves,such as p-courmaric acid and vanillic acid showed significant positive correlation with the duration of aphid development,but negative correlation with the aphid *** concentrations of these acids may be the causes of antibiosis resistance to *** identification of grain aphid-resistant wheat accessions in our study will be helpful in future b

关键词： Sitobion miscanthi spring wheat accessions antibiosis resistance electronic penetration graph high-performance liquid chromatography phenolic acid concentrations

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Co-dynamics of COVID-19 and TB with COVID-19 vaccination and exogenous reinfection for TB:An optimal control application

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Infectious Disease Modelling 2023年第2期8卷 574-602页

作者： Zenebe Shiferaw kifle Legesse Lemecha Obsu Department of Mathematics Adama Science and Technology UniversityAdamaEthiopia

COVID-19 and Tuberculosis(TB)are among the major global public health problems and diseases with major socioeconomic *** dynamics of these diseases are spread throughout the world with clinical similarities which makes them difficult to be *** this study,we formulate and analyze a mathematical model containing several epidemiological characteristics of the co-dynamics of COVID-19 and *** conditions are derived for the stability of both COVID-19 and TB sub-models *** certain conditions,the TB sub-model could undergo the phenomenon of backward bifurcation whenever its associated reproduction number is less than *** equilibria of the full TBCOVID-19 model are locally asymptotically stable,but not globally,due to the possible occurrence of backward *** incorporation of exogenous reinfection into our model causes effects by allowing the occurrence of backward bifurcation for the basic reproduction number R_(0)η*).The analytical results show that reducing R_(0)<1 may not be sufficient to eliminate the disease from the *** optimal control strategies were proposed to minimize the disease burden and related *** existence of optimal controls and their characterization are established using Pontryagin's Minimum ***,different numerical simulations of the control induced model are carried out to observe the effects of the control *** reveals the usefulness of the optimization strategies in reducing COVID-19 infection and the co-infection of both diseases in the community.

关键词： COVID-19 Co-infection Exogenous reinfection Basic reproduction number Bifurcation Optimal control

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Responses of phytoplankton and its satellite bacteria to exogenous ethanol

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Journal of Oceanology and Limnology 2023年第1期41卷 203-214页

作者： Rediat ABATE Buce Hanoch HETHARUA Vishal PATIL Daner LIN Demeke kifle Junrong LIANG Changping CHEN Lin SUN Shuh-Ji KAO Yonghong BI Bangqin HUANG Yahui GAO Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China School of Life Sciences Xiamen UniversityXiamen 361102China Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem College of Environment&EcologyXiamen UniversityXiamen 361102China State Key Laboratory of Marine Environmental Sciences Xiamen UniversityXiamen 361101China Department of Zoological Sciences Addis Ababa UniversityAddis AbabaPO Box 1176Ethiopia

The response of phytoplankton and its satellite bacteria to various concentrations(0.01%-10%v/v)of ethanol is *** elucidate the effect of ethanol,single-strains of phytoplankton(SSP)culture,pure strains of satellite bacteria isolated from nonaxenic SSP cultures,and Escherichia coli were *** indicate that ethanol could promote the growth and photo synthetic efficiency(F_(v)/F_(m))of S SP at 0.01%and the growth of satellite bacteria at 0.01%-1%.Nevertheless,ethanol inhibited the growth and F_(v)/F_(m)of SSP at 0.1%-1%,and killed bacteria and SSP at 10% *** investigation on a satellite bacterium(Mameliella alba)revealed that ethanol promotes growth by serving as a growth stimulant rather than a metabolic carbon *** 16 S rRNA gene amplicon indicated that all nonaxenic S SP cultures harbor distinct satellite bacteria communities where the SSP culture of Skeletonema costatum,Phaeodactylum tricornutum,and Dunaliella bardawil were dominated by bacteria genera of Marivita(~80%),Dinoroseobacter(~47%),and Halomonas(~87%),respectively,indicating that every SSP cultures have their own distinct satellite bacterial *** bacteria family Rhodobacteraceae was dominant in the two marine diatoms,whereas Halomonadaceae was dominant in the saline green *** to their respective controls,the supply of 0.5% ethanol to SSP cultures promoted the growth of the satellite bacteria but did not cause a significant difference in species composition of satellite ***,a low concentration of ethanol can promote the growth of bacteria in a non-selective *** study enriched our knowledge about the effect of ethanol on aquatic microbes and provided a baseline for basic and applied biotechnological re search in the aquatic environment in the future.

关键词： aquatic microbes bacteria diversity ethanol effect growth inhibition growth stimulation

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Patient safety practices and medical errors: Perception of health care providers at Jimma University Specialized Hospital, Southwest Ethiopia

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Open Journal of Preventive Medicine 2012年第2期2卷 162-170页

作者： Tsion Assefa Mirkuzie Woldie Shimeles Ololo kifle Woldemichael Department of Epidemiology Jimma University Jimma Ethiopia Department of Health Education and Behavioral Sciences Jimma University Jimma Ethiopia Department of Health Services Management Jimma University Jimma Ethiopia

Background: Even though evidences are limited in developing countries, the probability of patients being harmed in hospitals when receiving care might be much greater than that of the industrialized nations. Thus, aim of this study was to assess patient safety practice and the perceived prevalence of medical errors at Jimma University Specialized Hospital, Southwest Ethiopia. Methods: A facility based cross-sectional study was conducted during June, July and August 2010 in Jimma University Specialized Hospital. Patient safety grade and the perceived prevalence of medical errors were computed descriptively. Then, the effect of various independent variables on patient safety grade was assessed using multiple linear regressions analysis. Result: The overall patient safety grade as rated by the participants was excellent (7.2%), very good (20.7%), acceptable (36.0%), poor (30.0%) and failing (6.4%). Complications related to anesthesia occurred sometimes, rarely and never according to 30.8%, 43% and 15.8% of the respondents, respectively. Death in low mortality patients was reported to occur most of the time by 10.4% of the respondents. In addition, failure to rescue, infection due to medical care, postoperative hemorrhage, postoperative sepsis, birth injury to the neonate, obstetric trauma to the mother were reported to happened. Supervisor expectation and actions promoting patient safety (p < 0.001), and communication openness and feedback about errors (p = 0.002) had positive correlation with patient safety grade. Conclusion: this study indicated that poor patient safety practice and potentially preventable medical errors in the hospital.

关键词： Patient Safety Patient Safety Grade Perceived Prevalence of Medical Errors

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埃塞俄比亚乘客和货运铁路运输需求研究 ——以亚的斯亚贝至布提铁路线为例

埃塞俄比亚乘客和货运铁路运输需求研究 ——以亚的斯亚贝至布提...

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作者： Woldetsadik,Tesfa kifle 北京交通大学

学位级别：硕士

随着当今全球经济一体化发展和人口数量的增加,交通运输所扮演的角色在世界范围内受到了极大的关注。经济和运输自然未来的主流观点之一认为交通运输被反映在普通文献当中,强调运输是由于供需空间分离函数表达的原因而存在,因此它被认... 详细信息

随着当今全球经济一体化发展和人口数量的增加,交通运输所扮演的角色在世界范围内受到了极大的关注。经济和运输自然未来的主流观点之一认为交通运输被反映在普通文献当中,强调运输是由于供需空间分离函数表达的原因而存在,因此它被认为是“派生”于其它事件的[1]。然而,当前供应链和物流管理的发展突显了将客货运输的思考作为一种派生性需求的模式转换。在不同的实践模式中,生产,运输和消费的功能已经被植入到难以区分的地步。随着人口和经济的快速增长,埃塞尔比亚需要高效的交通系统。然而,这个国家除了航空运输外,其它的交通运输基础设施发展不完善;公路和铁路运输网络和线网密度处于低水平;这也是非洲最困难的挑战之一;包括财务、维护、专业人员和管理问题。尽管在铁路运输方面存在很多缺陷,埃塞尔比亚现已制定了一个雄心勃勃的计划,即要发展总长度为5000千米的铁路网络系统。本论文试图填补需求缺口,这在铁路网系统规划、建模和管理的投入至关重要。根据历史表明,吉布提铁路公司曾在交通和金融方面遭受巨大的损失,并逐渐被迫退出运营。本研究开发的直接需求模型简单,能够在单一计算的情况下产生交通需求。它在SPSS中采用不同的变量进行选择和分析,并用r=0.98和r2=0.96皮尔森系数进行验证模型。

关键词：铁路需求客货运输直接需求模型

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纸飞机的遥控器

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英语学习 2011年第5期 36-37页

作者： Yemisrach kifle 韩玎若（选注）

四岁的儿子以为他的爸爸是唯一赚钱养家的人，而作为妈妈的我与他同为“伸手阶级”因为我也和他一样，每天上学校。我没有急于纠正——小孩子的纯真能保持多久呢？

关键词：《纸飞机的遥控器》英语学习学习方法阅读

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Physico-chemical Characteristics of the Soils in Three Church Forest of Central Ethiopia

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Research in Ecology 2020年第4期2卷 1-8页

作者： Eguale Tadesse kifle Ethiopian Environment and Forest Research Institute Central Ethiopia Environment and Forest research CenterGurd SholaAddis AbabaEthiopia

positively or negatively depending on the *** has influence on the soil physico-chemical *** use land cover changes are the main factors in the process of land resource *** objectives of this study were to define the soil texture,bulk density and extent of organic carbon in church forests and adjacent croplands and to compare the *** lines of 100 meter apart and plots of 20 m×20 m were established to collect soil samples in the church forests and individual farm *** distance between plots was 100 *** based soil sampling was *** samples were collected on a diagonal position from 2 edges and the center from 2 soil horizons(H1 and H2)for soil texture and soil organic carbon(SOC)*** bulk density(BD)soil core samplers were *** data was analyzed using one way ANOVA in SPSS *** separation was undertaken by least significance *** results revealed the%clay content was significantly higher in croplands than church forests and the%sand was higher in church forests than croplands at(p<0.05).The SOC was significantly higher in H1 than H2 and in church forests than croplands at(p<0.05).The better soil characteristics were obtained in church forests than in ***,it is recommended to conserve the natural forests as in the church forests to maintain better property of the soil through enhancing soil organic matter,soil organic carbon and by decreasing soil bulk density.

关键词： Bulk density Farm land Land use Organic carbon Vegetation Soil texture Soil horizons

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