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TiB_2-Cu-Ni梯度功能材料的抗烧蚀行为

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稀有金属材料与工程 2004年第10期33卷 1072-1075页

作者：徐强张幸红韩杰才赫晓东 v.L.Kvalin 哈尔滨工业大学黑龙江哈尔滨150001 俄罗斯科学院宏观结构动力学研究所

采用燃烧合成与同时致密化技术制备了TiB2-Cu-Ni5层金属-陶瓷梯度功能材料。利用扫描电镜(SEM)、电子探针(EPMA)等方法对梯度材料的成分及烧蚀前后的微观组织形貌等进行了检测,用等离子火炬电弧加热器对材料进行加热来考察梯度材料的抗... 详细信息

采用燃烧合成与同时致密化技术制备了TiB2-Cu-Ni5层金属-陶瓷梯度功能材料。利用扫描电镜(SEM)、电子探针(EPMA)等方法对梯度材料的成分及烧蚀前后的微观组织形貌等进行了检测,用等离子火炬电弧加热器对材料进行加热来考察梯度材料的抗热震性能以及抗烧蚀性能。结果表明,梯度功能材料各层之间的界线已经模糊,层与层之间的结合较好;梯度材料在瞬间加热时和瞬间冷却时均未出现崩裂,烧蚀后表面没有裂纹产生,说明该梯度材料具有优异的抗热震性能;烧蚀20s后,梯度功能材料烧蚀后的质量损失仅为0.5g,说明梯度功能材料具有良好的抗烧蚀性能。梯度材料的抗烧蚀机理为金属粘接剂的挥发损失、热化学烧蚀和机械冲刷。该梯度材料在固体火箭发动机的喷管、喉衬等部件上有广阔的应用前景。

关键词：梯度功能材料 TiB2-Cu-Ni 抗热震性抗烧蚀行为

The paradox of our outcomes, and the use of qualitative methodology as a way to understand the realities of emerging countries

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Open Journal of Nursing 2012年第3期2卷 222-225页

作者： María Sandín vázquez Public Health and Medical-Social Sciences Faculty of Medicine Alcalá University Alcalá de Henares Spain

It is a fact that global health indicators in vulnerable populations are not improving, despite all resources concentrated in this area. Therefore, as a teacher and researcher in an international doctorate in Public Health, I took advantage of the contact with health professionals from Colombia, Peru and Bolivia (they were all my students) to try to better understand which factors may be affecting this paradox from the perspective of the major actors and therefore through a qualitative methodology. The main conclusion is that the health goals for the target populations (emerging and developing countries) are not the same as the goals for the planners and administrators of public health budgets. So if we want to improve health outcomes, it is time to let talk the people involved, and to let the administrators listen.

关键词： Global Health Qualitative Research Indigenous Populations

Nitric oxide-factor, which regulates proliferation and apoptosis in the adult brain of amur sturgeon <i>Acipenser schrenckii</i>

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Advances in Bioscience and Biotechnology 2012年第6期3卷 788-804页

作者： Е. v. Pushchina D. К. Obukhov A.v. Zhyrmunskii Institute of Marine Biology Far East Division Russian Academy of Sciences Vladivostok Russia St.Petersburg State University St. Petersburg Russia

The distribution of proliferative zones, NO-producing cells and apoptosis areas in the medulla oblongata, cerebellum, optic tectum, thalamus and hypothalamus of Amur sturgeon Acipenser schrenckii was investigated, using techniques of immunoperoxidase staining of proliferating cell nuclear antigen (PCNA), neuronal nitric oxide synthase and TU-NEL-labeling of fragmented DNA. It has been established, that in the sturgeon brain NO can act both as a cytotoxic proapoptogenic factor, and as a factor, which stimulates cell proliferation. The presence of NO-producing elements in somato- and viscerosensory areas of medulla oblongata, tectum, cerebellum and thalamus suppose, that in these brain areas NO constitutes apoptogenic factor, which induces the cells death in a territory of postmitotic neuroblasts, renders controlling effect on development and differentiating of chemosensory, visual, motor and hypophysotropic brain areas in postnatal ontogenesis. Maximal proliferating activity and high concentration of NO-ergic cells were revealed in external layers, adjoining to the medullar, cerebellar and tectum membranes, that allow to suppose NO participation in postnatal morphogenesis of these brain structures as a factor, which regulates cell proliferation. In sensory centers (tectum and nuclei of the v, vII, and X nerves), significantly varying ratios of intensities of proliferation and apoptosis were found;this is indicative of dissimilar rates of growth and differentiation in visual and chemosensory centers of the sturgeon brain. Presence of NO-producing elements in the PCNA- immuno-labeling and TUNEL-labeling brain areas allow to consider NO as a factor, which balances processes of proliferation and apoptosis in the sturgeon brain.

关键词： Adult Neurogenesis Nitric Oxide Apoptosis Sturgeon Neotenia Development of Sensory Systems

采用发射光谱/脉冲分辨联用技术测定夹杂物粒度分布

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冶金分析 2013年第3期33卷 9-13页

作者： NASTASI G WESTER R COLLA v NOLL R Scuola Superiore Sant'Anna-TeCIP Institute Pisa 56124Italy Fraunhofer-Institut für Lasertechnik Aachen 52074Germany

通过解析发射光谱和脉冲分辨分析联用技术(OES/PDA)数据确定钢铁中夹杂物的类型及计算其粒度分布需要借助于高等数学方法,以便在大量的数据中滤出那些与夹杂物相关的OES/PDA数据,从而找到可靠的该数据集的离群数据。强度及大多的质量分... 详细信息

通过解析发射光谱和脉冲分辨分析联用技术(OES/PDA)数据确定钢铁中夹杂物的类型及计算其粒度分布需要借助于高等数学方法,以便在大量的数据中滤出那些与夹杂物相关的OES/PDA数据,从而找到可靠的该数据集的离群数据。强度及大多的质量分布其分布函数都是非正态分布的,因此,通过对这些数据进行拟合即可得到非属于该正态分布的离群数据。离群数据确定后,通过这些信息可找到与一些特定夹杂物类型相关联的数据群。基于此目的,发现一种称为"自组织特征映射(SOM)"的数学方法非常适于进行此项研究。根据离群数据及夹杂物类型的相关信息,采用该方法可以计算出质量分布并能进一步进行不同夹杂物类型的粒度分布计算。

关键词：钢脉冲分辨技术夹杂数据处理

Phosphonated USY,a promising catalyst for the development of environmentally benign biodiesel(methyl acetate) process

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Journal of Energy Chemistry 2015年第3期24卷 285-290页

作者： Kakasaheb Y.Nandiwale Gahana Gopal.C vijay v.Bokade Catalysis and Inorganic Chemistry Division CSIR National Chemical Laboratory

The present study focuses on the evaluation of the potential applicability of Ultra Stable Y（USY） and phosphonated USY（1 wt%-4 wt%phosphorous loading） as heterogeneous catalysts for biodiesel（methyl acetate） *** synthesized catalysts were characterized by powder X-ray diffraction（XRD）,Brunaer-Emmett-Teller（BET） surface area,total acidity by temperature-programmed desorption of ammonia（TPD-NH3） and Fourier Transform Infrared（FTIR） *** performances of catalysts were evaluated for the transesterification of butyl acetate with methanol（a model reaction in biodiesel production）.In view to obtain a maximum yield of methyl acetate,the optimization of process parameters such as reactant molar ratio,catalyst loading,reaction temperature and reaction time was *** the phosphonated USY catalysts showed higher catalytic activity than the parent USY,which can be attributed to the increase of total acidity due to phosphonation.2 wt% P/USY（2% phosphorous loaded on USY） exhibited 92% methyl acetate yield with 100% selectivity,which was proved to be a potential catalyst for biodiesel *** invented catalyst was found to be stable and reusable for five catalytic cycles,demonstrating that it might be a environmentally benign catalytic process.

关键词： transesterification phosphonated USY methyl acetate biodiesel

Catatonia in older adults:A systematic review

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World Journal of Psychiatry 2022年第2期12卷 348-367页

作者： Walter Jaimes-Albornoz Angel Ruiz de Pellon-Santamaria Ayar Nizama-vía Marco Isetta Ines Albajar Jordi Serra-Mestres Psychiatry Service Hospital Universitario DonostiaBasque Health Service-OsakidetzaSan Sebastian 20014GipuzkoaSpain Psychiatry Service“virgen del Cisne”Mental Health Community Center Regional Health DirectorateTumbes 24002Peru Library and Knowledge Services Central&North West London NHS Foundation TrustSt Charles’HospitalLondon W106DZUnited Kingdom Neurology Service Hospital Universitario DonostiaBasque Health Service-OsakidetzaSan Sebastian 20014GipuzkoaSpain Old Age Psychiatry Service Cardinal ClinicWindsor SL45ULUnited Kingdom

BACKGROUnd Catatonia is a complex psychomotor syndrome that often goes unrecognized and untreated,even though its classification has evolved in recent *** and correct identification of catatonia allows for highly effective treatment and prevention of possible *** underrecognition of catatonia in older patients is also frequent,and research in this population is *** To conduct a systematic review of the literature on catatonia in older people to ascertain its clinical characteristics across *** Following the PRISMA guidelines,MEDLINE,EMBASE,and PsycINFO databases were searched from inception to December 2021,with a strategy aimed at identifying all articles published on catatonia in older *** and abstracts were scanned and selected independently by two *** investigating issues related to catatonia and/or catatonic symptoms in older people,with English abstracts available,were *** of selected articles were revised to identify other relevant *** In total,1355 articles were *** removing duplicates,879 *** the 879 identified abstracts,669 were excluded because they did not meet the inclusion criteria.A total of 210 articles underwent full text review,and 51 were eliminated for various *** more articles were selected from the ***,173 articles were reviewed:108 case reports,35 case series,11 prospective cohort studies,6 case-control studies,3 retrospective cohort studies and 10 *** found several particular aspects of catatonia in this *** in older patients is highly prevalent and tends to have a multifactorial *** patients,compared to younger patients,have a higher risk of developing catatonia with benzodiazepine(BZD)withdrawal,in bipolar disorder,and in the general ***,together with other risk factors,was significantly associated with the incidence of deep venous thrombosis,neuroleptic malig

关键词： Catatonia Older adults Etiology Phenomenology Prevalence Treatment

The Potential Role of a Health and Demographic Surveillance System in Rural Northern Nigeria to Reduce Maternal and Child Deaths

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Health 2015年第12期7卷 1741-1746页

作者： Olatunji Alabi Henry v. Doctor Nahuche Health and Demographic Surveillance System Zamfara State Nigeria Demography and Social Statistics Federal University Birnin Kebbi Nigeria Regional Office for the Eastern Mediterranean Department of Information Evidence and Research World Health Organization Cairo Egypt

There exist a huge gap between generation of evidence-based research findings and its use to inform policies in most developing countries. Further, it is evident that most developing countries are lagging behind in formulating appropriate policies aimed at improving people’s lives due to lack of evidence-based research findings. We describe the potential of a Health and Demographic Surveillance System (HDSS) in informing appropriate health interventions towards reducing the high maternal and child deaths in rural communities of north western Nigeria through the verbal Autopsy (vA) data collection. vA data collection involves the use of vA questionnaires—set of open ended and closed ended questions adapted from the World Health Organization (WHO) module— administered to the caregivers, parents or family members of a deceased person to elicit information on signs and symptoms and their durations, and other pertinent information about the deceased in the period before death. vA interviews were conducted by trained vA enumerators on all 2100 deaths reported during the update round 4 of routine data collection (July-December, 2012) and returned forms were checked for consistencies and completeness by a trained research officer. The forms were later coded by trained medical doctors for possible cause of death using the WHO International Classification of Diseases (ICD 10) codes. Fifty cases of neonatal deaths, 1650 cases of infant and child deaths, and 400 cases of adult deaths were reported during the update round 4 data collection. Neonatal sepsis was reported as the leading cause of neonatal deaths (58%) while malaria and intestinal infectious diseases were reported as the leading cause of infant and child deaths and adult deaths respectively (45% and 17%, respectively). The study provides documented evidence of high neonatal deaths due to neonatal sepsis in an area with low hygiene and high home delivery rates. The findings from the vA data collection at Nahuche HDSS

关键词： Maternal and Child Deaths verbal Autopsy Chlorhexidine Demographic Surveillance Health Systems Nigeria

FLOW FIELD IN SCOURED ZONE OF CHANNEL CONTRACTIONS

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International Journal of Sediment Research 2004年第4期19卷 292-311页

作者： Rajkumar v. RAIKAR,Subhasish DEY Kharagpur 721302 West Bengal India. Doctoral Research Fellow Department of Civil Engineering Indian Institute of Technology Kharagpur 721302 West Bengal India. Associate Professor Department of Civil Engineering Indian Institute of Technology

Experiments were conducted in a laboratory flume to measure the two-dimensional turbulent flow field in the scoured zone of channel contractions under a clear-water scour condition. The Acoustic Doppler velocimeter (ADv) was used to detect the flow field at different vertical lines along the centerline of uncontracted (main channel) and contracted zones of the channel. The distributions of time-averaged velocity components, turbulent intensity, turbulent kinetic energy, and Reynolds stresses are presented in nondimensional graphical form. The bed shear stresses are computed from the measured Reynolds stresses being in threshold condition within the zone of contraction where bed was scoured. The data presented in this paper would be useful to the investigators for the development of kinematic flow model and morphological model of scour at a channel or river contraction.

关键词： Channel contraction Open channel flow Turbulent flow Erosion Scour Sediment transport Fluvial hydraulics

Deep learning based computer-aided diagnosis for neuroimaging data: focused review and future potential

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Neuroimmunology and Neuroinflammation 2018年第1期5卷 1-3页

作者： v.B.Surya Prasath Computational Imaging and visAnalysis(CIvA)Lab Department of Computer ScienceUniversity of Missouri-ColumbiaColumbiaMO 65211USA Division of Biomedical Informatics Cincinnati Children's Hospital Medical Center(CCHMC)CincinnatiOH 45229USA Department of Biomedical Informatics College of MedicineUniversity of CincinnatiOH 45267USA

Automatic image analysis techniques applied to neuroimaging data in general, and magnetic resonance imaging (MRI), and functional MRI (fMRI) in particular, have proven to be effective computer-aided diagnosis (CAD) tools in neuroscience(1-4)Recently, the advancements in machine learning techniques combined with the wide availability of computational power have proven to be efficient in solving previously difficult problems in analyzing neuroimaging data. At the forefront of these advancements is the usage of deep (artificial) neural network architectures that led robust learning based techniques to attack challenging problems such as segmentation and classification in neuroimaging data[5-8].

关键词： Deep learning neuroimaging data future potential