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Spectral analysis in ultraweak emissions of chemi-and electrochemiluminescence systems

Journal of Rare Earths 2009年第4期27卷 593-597页

作者： K.Staninski M.Kaczmarek S.Lis d.komar A.Szyczewski Faculty of Chemistry Adam Mickiewicz University Faculty of Physics Adam Mickiewicz University

Investigation of ultraweak emissions in the processes of chemiluminescence, CL, and electrochemiluminesce, ECL, requires special techniques of their recording and spectral analysis. From among the hitherto proposed methods of detection of the emission spectra of these processes, that of the cut-off filter was most sensitive. The usefulness of this method in interpretation of the CL and ECL systems of the quantum yields in the range 1×10^-9-1×10^-11 containing ions and complexes of Eu（Ⅲ）, Tb（Ⅲ） and dy0Id was shown. Exceptional character of the emission bands of lanthanide ions, being a result of the f-f electron transitions and in particular their low FWHM, permitted the appli- cation of the cut-off filter method to their analysis. The results obtained for CL and ECL on the basis of analysis of ultraweak emission proved to be successful in analytical applications. The systems containing Eu（Ⅲ） ions hydrated or complexed with organic ligands enabled inferring changes in the coordination sphere of the ions.

关键词： chemiluminescence electrochemiluminescence cut-off fdter method lanthanide rare earths

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选择性起动条件下砾石沉积物转动角的实验室测量

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海洋与湖沼 1992年第3期23卷 252-259页

作者：李振林秦蕴珊 Paul d.komar 中国科学院海洋研究所青岛266071 美国俄勒冈州大学海洋学院

沉积物颗粒与下覆颗粒间转动角是制约沉积物颗粒起动的一个重要因素。本文样品采集于1987年。作者通过一系列实验探明了沉积物转动角同颗粒形状、相对粒径比以及迭瓦状构造等因素之间的相互关系。在均匀粒径条件下,球状砾石转动角的测... 详细信息

沉积物颗粒与下覆颗粒间转动角是制约沉积物颗粒起动的一个重要因素。本文样品采集于1987年。作者通过一系列实验探明了沉积物转动角同颗粒形状、相对粒径比以及迭瓦状构造等因素之间的相互关系。在均匀粒径条件下,球状砾石转动角的测量数值同理论数值相吻合,但随粒径的减小而增大。这一结果同前人利用球状砂粒进行实验所获得的结果相一致。利用球状、椭球状及棱角状砾石进行的实验表明,沉积物转动角φ随相对粒径的增大而减小,随颗粒扁平度及颗粒棱角度的增大而增大。扁平砾石的迭瓦状构造将导致转动角的增大,其增大值约等于砾石的迭瓦角。若其它因素相同,沉积物起动的难度自球状、椭球状、棱角状及迭瓦状构造而依次增强。这些结果将有助于对颗粒粒径、形状、构造同沉积物搬运临界状态以及沉积物选择性起动之间的相互关系进行定量分析。

关键词：砾石转动角起动沉积物

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沉积物选择性起动机理及其在砾石沉积临界值分析中的应用

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海洋与湖沼 1992年第1期23卷 30-38页

作者：李振林秦蕴珊 Paul d.komar 中国科学院海洋研究所青岛266071 美国俄勒冈州立大学海洋学院

混合粒径条件下沉积物的起动机理不同于均匀粒径条件下沉积物的起动机理。混合粒径条件下沉积物的起动,可由沉积物转动角Φ随相对粒径及颗粒形状而变化的依从关系进行解释。通过对砾石沉积物因木同粒径、形状而发生选择性起动的动力过... 详细信息

混合粒径条件下沉积物的起动机理不同于均匀粒径条件下沉积物的起动机理。混合粒径条件下沉积物的起动,可由沉积物转动角Φ随相对粒径及颗粒形状而变化的依从关系进行解释。通过对砾石沉积物因木同粒径、形状而发生选择性起动的动力过程的分析,得出了砾石沉积物转动角选择性起动的理论模式,采用该模式来定量计算潮汐流和河流中砾石沉积物选择性起动的临界值,计算结果和测量结果吻合,从而证实了该模式的可靠性。

关键词：沉积物选择性起动运动机理砾石沉积临界转动角

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Risk factors for colonoscopic perforation: A population-based study of 80118 cases

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World Journal of Gastroenterology 2013年第23期19卷 3596-3601页

作者： Uzair Hamdani Raza Naeem Fyeza Haider Pardeep Bansal Michael komar david L diehl H Lester Kirchner department of Gastroenterology Geisinger Medical CenterDanville PA 17822 United States department of Gastroenterology Good Samaritan HospitalVincennes IN 47591 United States Central Indiana Gastroenterology Anderson IN 46016 United States division of Medicine Gesinger Medical CenterDanville PA 17822 United States

AIM: To assess the incidence and risk factors associated with colonic perforation due to colonoscopy. METHOdS: This was a retrospective cross-sectional study. Patients were retrospectively eligible for inclusion if they were 18 years and older and had an inpatient or outpatient colonoscopy procedure code in any facility within the Geisinger Health System during the period from January 1, 2002 to August 25, 2010. data are presented as median and inter-quartile range, for continuous variables, and as frequency and percentage for categorical variables. Baseline comparisons across those with and without a perforation were made using the two-sample t -test and Pearson's χ2 test, as ***: A total of 50 perforations were diagnosed out of 80118 colonoscopies, which corresponded to an incidence of 0.06% (95%CI: 0.05-0.08) or a rate of 6.2 per 10000 colonoscopies. All possible risk factors associated with colonic perforation with a P -value d for inclusion in a multivariable logbinomial regression model predicting 7-d colonic perforation. The final model resulted in the following risk factors which were significantly associated with risk of colonic perforation: age, gender, body mass index, albumin level, intensive care unit (ICU) patients, inpatient setting, and abdominal pain and Crohn's disease as indications for colonoscopy. CONCLUSION: The cumulative 7 d incidence of colonic perforation in this cohort was 0.06%. Advanced age and female gender were significantly more likely to have perforation. Increasing albumin and BMI resulted in decreased risk of colonic perforation. Having a colonoscopy indication of abdominal pain or Crohn's disease resulted in a higher risk of colonic perforation. Colonoscopies performed in inpatients and particularly the ICU setting had substantially greater odds of perforation. Biopsy and polypectomy did not increase the risk of perforation and only three perforations occurred with screening colonoscopy.

关键词： Colonoscopic perforation Colon cancer Endosocopy

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Method for determination of Optimal Installed Capacity of Renewable Sources of Energy by the Criterion of Minimum Losses of Active Power in distribution System

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Energy and Power Engineering 2014年第3期6卷 37-46页

作者： P. d. Lezhniuk V. A. komar d. S. Sobchuk department of Electric Energy Supply Lutsk National Technical University Lutsk Ukraine department of Electric Power Stations and Systems Vinnytsia National Technical University Vinnytsia Ukraine

New method for determination of optimal placement and value of installed capacity of renewable source of energy (RES) by the criterion of minimum losses of active power, that allows taking into consideration the dependence of RES on natural conditions of region, schedule of energy supply, parameters and configuration of distribution network is suggested in the paper. Results of computations of test scheme confirm the efficiency of the proposed method and its simplicity as compared with the methods considered in literature sources.

关键词： distributed Generation Renewable Sources of Energy Minimum Losses of Active Power

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Flood Hazards in Erbil City Kurdistan Region Iraq, 2021: A Case Study

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Engineering（科研） 2022年第12期14卷 591-601页

作者： Varoujan K. Sissakian Nadhir Al-Ansari Nasrat Adamo Iyda d. Abdul Ahad Salwan A. Abed department of Petroleum Engineering Komar University of Science and Technology Sulaymaniyah Iraq Lulea University of Technology Lulea Sweden Retired dams Engineer Norrk&#246 ping Sweden Retired Senior Chief Geologist Erbil Iraq College of Science University of Al-Qadisiyah Diwaniyah Iraq

Erbil city is constructed in a flat plain with moderate gradient increasing northwards, the plain is dissected by tens of ephemeral wadis. The maximum elevation in the high lands NE of Erbil city is 1062 m (a.s.l.), whereas the elevation of the center of Erbil city is 420 m (a.s.l.). The average gradient from the highest part to the center of the city is 2.15%, increasing towards northeast to reach 4.79%. The mean annual rainfall is 365 mm, while the average monthly rainfall is about 24.42 mm. The site of the city is mainly covered by alluvial fan sediments. Towards northeast, however, the exposures of the Bia Hassan Formation, which consists of alternation of conglomerate and claystone cover considerable areas (82 km2) and form the high lands NE of Erbil city. The exposed rocks are thick claystone alternating with coarse conglomerate. Two very heavy torrential rain events have caused flash floods in Erbil city on 30th October and 17th december 2021. The rainfall intensities were 52 mm/day and 60 mm/day, respectively, causing destructive floods. The most affected areas were Zirin (north of Erbil) and dara Too (northeast of Erbil), respectively, with very heavy property damages and tens of fatalities. The main reasons for the floods were the partially constructed embankments of the 150 m ring-road, and the urban development within large and wide drainage basins. different climate data were used for the purpose of this article, with field checks.

关键词： Flood Climate Change Rainfall Fatalities Erbil

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