scholarly journals Coating Deterioration and Underlying Metal Corrosion Processes in Water-Line Area: Role of DACs

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 684 ◽  
Author(s):  
Zhiwei Chen ◽  
Wei Zhang ◽  
Yi Zhan ◽  
Bing Lei ◽  
Tianying Sun ◽  
...  
Keyword(s):  
Thin Liquid Film ◽  
Current Density Distribution ◽  
Metal Corrosion ◽  
Localized Corrosion ◽  
Water Line ◽  
Kinetic Information ◽  
Initial Stage ◽  
Continuous Surface ◽  
Anodic Zone

Water-line corrosion is a highly concentrated type of localized corrosion. The conventional single electrode method is limited in its ability to obtain the kinetic information of the corrosion occurrence and development processes. Herein, the coating deterioration and underlying metal corrosion processes in water-line area were studied by a small wire beam electrode to monitor the current density distribution. The distance between each electrode was very small (interval: 0.3 mm), thus facilitating it to approach the practical metal component with a continuous surface. The results showed that cathodic and anodic sites tended to be weak points of the coating at the initial stage. With the continuous degradation of the coating, the cathodic zone tended to occur in the above the anodic zone due to the effect of differential aeration cells (DACs). Subsequently, the cathodic zone expanded to the waterline and the polarity reversed to the anodic zone, causing the coating to peel and blister continuously from the bottom up. When the cathodic zone extended to the gas phase area above the water line, this area became the strongest cathodic zone under the action of the thin liquid film, thus significantly accelerating the corrosion of the base metal at the bottom. The present study aims to achieve an in-depth understanding of coating deterioration and underlying metal corrosion processes in the water-line area, providing a new means of directly visualizing the role of DACs played in water line corrosion.

scholarly journals A LONGITUDINAL INVESTIGATION OF EXPLICIT AND IMPLICIT AUDITORY PROCESSING IN L2 SEGMENTAL AND SUPRASEGMENTAL ACQUISITION

2021 ◽  
pp. 1-23
Author(s):  
Hui Sun ◽  
Kazuya Saito ◽  
Adam Tierney
Keyword(s):  
Adult Learners ◽  
Auditory Processing ◽  
First Language ◽  
Neural Representation ◽  
Immersion Experience ◽  
Initial Stage ◽  
Chinese Learners ◽  
Processing Ability ◽  
Speech Learning

Abstract Precise auditory perception at a subcortical level (neural representation and encoding of sound) has been suggested as a form of implicit L2 aptitude in naturalistic settings. Emerging evidence suggests that such implicit aptitude explains some variance in L2 speech perception and production among adult learners with different first language backgrounds and immersion experience. By examining 46 Chinese learners of English, the current study longitudinally investigated the extent to which explicit and implicit auditory processing ability could predict L2 segmental and prosody acquisition over a 5-month early immersion. According to the results, participants’ L2 gains were associated with more explicit and integrative auditory processing ability (remembering and reproducing music sequences), while the role of implicit, preconscious perception appeared to be negligible at the initial stage of postpubertal L2 speech learning.

Incorporation and Role of Nitrogen During Oxynitridation of Silicon Studied by Photoelectron Spectroscopy

1999 ◽  
Vol 567 ◽  
Author(s):  
Masayuki Suzuki ◽  
Yoji Saito
Keyword(s):  
Photoelectron Spectroscopy ◽  
High Vacuum ◽  
Oxide Films ◽  
Silicon Surfaces ◽  
Gaseous Mixtures ◽  
X Ray ◽  
Initial Stage ◽  
Thermal Stability Of

ABSTRACTWe tried direct oxynitridation of silicon surfaces by remote-plasma-exited nitrogen and oxygen gaseous mixtures at 700°C in a high vacuum. The oxynitrided surfaces were investigated with in-situ X-ray photoelectron spectroscopy. With increase of the oxynitridation time, the surface density of nitrogen gradually increases, but that of oxygen shows nearly saturation behavior after the rapid increase in the initial stage. We also annealed the grown oxynitride and oxide films to investigate the role of the contained nitrogen. The desorption rate of oxygen from the oxynitride films is much less than that from oxide films. We confirmed that nitrogen stabilizes the thermal stability of these oxynitride films.

Localized corrosion in AA2099-T83 aluminum–lithium alloy: The role of intermetallic particles

2015 ◽  
Vol 161 ◽  
pp. 201-210 ◽  
Author(s):  
Y. Ma ◽  
X. Zhou ◽  
W. Huang ◽  
G.E. Thompson ◽  
X. Zhang ◽  
...  
Keyword(s):  
Localized Corrosion ◽  
Lithium Alloy ◽  
Aluminum Lithium Alloy ◽  
Intermetallic Particles ◽  
Aluminum Lithium

Arthrocladiella mougeotii. [Descriptions of Fungi and Bacteria].

1998 ◽  
Author(s):  
V. P. Heluta
Keyword(s):  
Czech Republic ◽  
Geographical Distribution ◽  
Disease Transmission ◽  
Russian Far East ◽  
Far East ◽  
Republic Of Georgia ◽  
Lycium Barbarum ◽  
Initial Stage ◽  
High Infection

Abstract A description is provided for Arthrocladiella mougeotii. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Powdery mildew of Lycium species only. The mycelium, conidiophores, conidia and ascomata form first white, then dirty-grey patches on damaged green parts of the host. Infected parts are deformed slightly and, in cases of high infection, plants can lose their ornamental qualities. Damaged leaves can fall prematurely. HOSTS: Lycium barbarum (= L. europaeum), L. chinense, L. dasystemum, L. halimifolium, L. ovatum, L. potaninii, L. rhombifolium, L. ruthenicum. [Type host - Lycium barbarum] GEOGRAPHICAL DISTRIBUTION: Africa: Canary Islands. Asia (temperate areas only): Armenia, Azerbaijan, China, Republic of Georgia, Israel, Japan, Kazakhstan, Kirghizistan, Korea, Russia (Russian far east), Tadzhikistan, Taiwan, Turkey, Turkmenistan, Uzbekistan. Australasia: New Zealand (introduced). Europe: Austria, Belgium, Bulgaria, Czech Republic, Estonia, France, Germany, Hungary, Italy, Netherlands, Norway, Poland, Rumania, Slovakia, Sweden, Switzerland, UK, Ukraine (southern), former Yugoslavia. North America: USA (introduced). TRANSMISSION: By wind-dispersed conidia. The rôle of ascospores in disease transmission is unknown, although it has been supposed that they can cause the initial stage of the disease.

Significance of analysis of the mechanism of fingermarks formation, sizes and location – casework examples

2018 ◽  
Vol 301 ◽  
pp. 44-52
Author(s):  
Tomasz Kowalski ◽  
Keyword(s):  
Significant Role ◽  
Special Interest ◽  
The Other ◽  
Fatal Accident ◽  
Preliminary Stage ◽  
Additional Information ◽  
Expert Opinions ◽  
First Case ◽  
Initial Stage

The aim of the article to present the role of analysing the manner of generating fingermarks in the investigative proceedings. These examinations are based on the analysis of the location of the marks on a given background and aim at providing the requesting party additional information about the circumstances of the investigated incident. The Author refers to two unusual cases, in which Voivodeship Police Command Forensic Laboratory issued expert opinions in the area of fingerprint identification. In the first case, at the initial stage of the proceedings the circumstances and recovered evidential fingermarks indicated a fatal accident or manslaughter by means of a firearm. In the other case at the preliminary stage recovered evidence did not allow identification of the perpetrator due to incorrectly selected exhibits. These cases would not be off special interest to us without the significant role of proper recovering of fingermarks and their analysis in a broader context than just identification.

Motivation for Reading of Students from initial stage of primary education (1st to 4th Grade)

2020 ◽  
Vol 28 (1) ◽  
Author(s):  
Diana Vatsova ◽  
◽  
◽  
Keyword(s):  
Primary Education ◽  
Cognitive Processes ◽  
Fourth Grade ◽  
Building Element ◽  
Literary Education ◽  
Initial Stage ◽  
Fourth Grade Students ◽  
Competency Based ◽  
Education Of Students

The article discusses one of the areas of the literary education of students in the initial stage of primary education: developing interest in reading. The timeliness and relevance of the problem treated determine the purpose of the study: based on international pedagogical experience, to define a model that increases the interest in reading within the competency-based approach, and highlight the role of motivation as a building element of this model. Analyses of the structure of motivation for reading, and the means of integration of cognitive processes and creativity when working with artistic text are done, being the aim to increase the motivation for reading of first to fourth grade students.

THE GEOLOGICAL ROLE OF THE SEARCH METHOD "WILD CAT WELLS" IN THE STUDY OF THE HYDROCARBON POTENTIAL OF THE PRIPYAT TROUGH

2021 ◽  
pp. 148-168
Author(s):  
Yaroslav G. Gribik
Keyword(s):  
Search Method ◽  
Hydrocarbon Potential ◽  
Geological Exploration ◽  
Positive Role ◽  
Oil Reserves ◽  
Hydrocarbon Traps ◽  
Deep Wells ◽  
Initial Stage ◽  
Exploratory Wells

The results of geological exploration for oil within the Elsky, Shatilkovsky, Savichsky and Petrikovsko-Shestovichsky sections of the Pripyat trough are analyzed. The analysis covers almost 70 years from the drilling of the first exploratory wells laid by the "wild cat" method to the modern comprehensive justification. During the analyzed period, from 12 to 23 deep wells were drilled with a total penetration of 42.3 thousand meters to 68.3 thousand meters in each section. The initial stage of work after the first oil inflow is characterized by a higher activity of drilling new exploratory wells, justified by the methods available at that time. The negative result of exploratory drilling in certain areas is also due to the significant fragmentation of the intrasalt perspective horizons and the areal unevenness of reservoir layers in the subsalt complex. Within the boundaries of the sites, deposits with recoverable oil reserves of no more than 450 thousand tons are established, which can be determined as a low economic efficiency of prospecting operations. However, the work has played a positive role in determining real models of hydrocarbon traps for use in the study of other sites.

scholarly journals Morphofunctional characteristics of endothelial cells in coronary atherosclerosis

2011 ◽  
Vol 63 (4) ◽  
pp. 921-932 ◽  
Author(s):  
Vesna Lackovic ◽  
Irena Tanaskovic ◽  
Dj. Radak ◽  
Vesna Nesic ◽  
Z. Gluvic ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Coronary Atherosclerosis ◽  
Complex Disease ◽  
Early Stage ◽  
Intercellular Junctions ◽  
Vascular Wall ◽  
Functional Changes ◽  
Initial Stage ◽  
Numerous Data

Atherosclerosis represents a complex disease which encompasses all the components of the vascular wall. Nevertheless, according to all known theories of the pathogenesis of atherosclerosis, the key role in this process belongs to the endothelial cells, i.e. the changes that they are subjected to especially during the initial stage of the lesion. In this review we have attempted, according to the results of our continuous research and numerous data from available modern literature, to show the cytohistological characteristics of endothelial cells, as well as the changes they are subjected to in all stages of atherosclerosis. In the first part we have reviewed the ultrastructure, function and pathology of the endothelium, subcellular organization of the endothelial cells, their specific characteristics, micro compartments and intercellular junctions. In the second part we have described the morphological and functional changes of endothelial cells during atherosclerosis. Special attention is given to the role of endothelial cells in the development of the initial stage of lesion: endothelial dysfunction, factors that cause the increased expression of adhesion molecules in endothelial cells and mechanisms that cause leukocytes to migrate through the endothelial layer to subendothelial connective tissue in the early stage of atherosclerosis.

scholarly journals Impact Size and Determinants of Indirect Cost of Financial Distress: Role of Receivable and Inventory Management

2020 ◽  
Vol 16 (2) ◽  
pp. 179-207
Author(s):  
Umar Farooq ◽  
Muhammad Ali Jibran Qamar ◽  
Krishna Reddy
Keyword(s):  
Indirect Cost ◽  
Inventory Management ◽  
Financial Distress ◽  
Multi Stage ◽  
Initial Stage ◽  
Non Linear ◽  
Management Policies ◽  
Internal Operations ◽  
The Impact

This research investigates the opportunity cost as an indirect cost of financial distress from two perspectives. First, indirect cost is estimated using multi-stage financial distress and non-linear proxy of debt. Second, receivable and inventory management are studied as determinants of indirect cost. The sample includes ongoing Pakistani firms that were healthy in the previous year and documenting positive gross profit. Results showed that firms bear opportunity loss primarily due to leverage rather than multistage financial distress. However, a non-linear relationship is found between leverage and indirect cost. Results further explored the impact of multistage financial distress on internal operations, i.e., working capital policies. It is found that firms manage receivable and inventory simultaneously during the multistage financial distress. Results revealed that increasing receivables and decreasing inventory is suitable during the transition of healthy firms to initial stage of financial distress, i.e., profit reduction. However, decreasing receivables, along with holding more inventory, is recommended for healthy firms that face liquidity problems subsequently. It is concluded that managers can reduce the indirect cost after deploying the optimal debt ratio and recommended receivable and inventory management policies.

scholarly journals Borrelia burgdorferi Resistance to a Major Skin Antimicrobial Peptide Is Independent of Outer Surface Lipoprotein Content

2009 ◽  
Vol 53 (10) ◽  
pp. 4490-4494 ◽  
Author(s):  
Amit Sarkar ◽  
Kit Tilly ◽  
Philip Stewart ◽  
Aaron Bestor ◽  
James M. Battisti ◽  
...  
Keyword(s):  
Borrelia Burgdorferi ◽  
Antimicrobial Peptide ◽  
Immune Evasion ◽  
Essential Role ◽  
Potential Role ◽  
Innate Immune ◽  
Initial Stage ◽  
Mammalian Infection ◽  
Innate Immune Evasion

ABSTRACT We hypothesize a potential role for Borrelia burgdorferi OspC in innate immune evasion at the initial stage of mammalian infection. We demonstrate that B. burgdorferi is resistant to high levels (>200 μg/ml) of cathelicidin and that this antimicrobial peptide exhibits limited binding to the spirochetal outer membrane, irrespective of OspC or other abundant surface lipoproteins. We conclude that the essential role of OspC is unrelated to resistance to this component of innate immunity.

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