scholarly journals Influence of Coastal Atmosphere in the Corrosion of Components in Metallic Structures of Cuban Telecommunications Company (ETECSA) in Ciego de Avila, Cuba

2020 ◽  
Vol 8 (4) ◽  
Author(s):  
Wilman Pereiro Fuentes ◽  
Nancy Garcia Alvarez ◽  
Antonio Daquinta Gradaille
Keyword(s):  
Pitting Corrosion ◽  
Atmospheric Corrosion ◽  
Geographic Location ◽  
Weather Conditions ◽  
Paint Layer ◽  
Metallic Structures ◽  
Loss Of Mass ◽  
One Year ◽  
Almost All ◽  
Telecommunications Company

Atmospheric corrosion of metals is an electrochemistry discontinuous process, which occurs only when the metal surface is wet or damp with various weather phenomena as rain, condensation, fog and other. NaCl is identified as one of the most aggressive pollutants for atmospheric corrosion to occur in coastal environments. Weather conditions in Cuba, together with its configuration and geographic location allow that the influence of the marine aerosol arrived to almost all the national territory favoring notably the deterioration of materials, especially the metallic ones. For this reason, it was decided to carry out a preliminary study of the effect of the coastal atmosphere on the corrosion of the components in metallic structures AT-60 and Najasa models of the Cuban Telecommunications Company (ETECSA) in Ciego de Ávila, Cuba. The selected components were subjected to micro and macro analysis. The coexistence of the loss of the paint layer with the onset of pitting corrosion was evidenced in the images observed by microscopy, while the results of the macro analyzes, only for components of the AT-60 model showed affectations, after one year of exposure, with decreases in the thickness of the metal between 50 and 100%, a loss of mass of 18.3% and perforations due to pitting corrosion that reached a diameter of up to 17 mm These reasons justified the need of a particular maintenance management in these zones.

Resistance of cherry varieties to spring return frozes in the conditions of Astrakhan region

2020 ◽  
Author(s):  
A.A. Dronic A.A. ◽  
Keyword(s):  
Weather Conditions ◽  
Damage Score ◽  
The Stability ◽  
Almost All ◽  
Total Damage ◽  
Continental Climate ◽  
Unfavorable Weather

The article presents an assessment of the stability of introduced cherry varieties to spring return frosts in 2020 in the conditions of the sharply continental climate of the Astrakhan region. As a result of unfavorable weather conditions, the total damage score of all varieties was 2-5 points. Almost all the studied varieties showed an insufficient level of resistance to recurrent frosts.

scholarly journals Recruitment, Dispersal, and Demographic Rescue in Spatially-Structured White-Tailed Ptarmigan Populations

The Condor ◽  
2000 ◽  
Vol 102 (3) ◽  
pp. 503-516 ◽  
Author(s):  
Kathy Martin ◽  
Peter B. Stacey ◽  
Clait E. Braun
Keyword(s):  
General Pattern ◽  
Population Connectivity ◽  
Site Location ◽  
Breeding Sites ◽  
Stochastic Conditions ◽  
Local Survival ◽  
Regular Event ◽  
Study Sites ◽  
One Year ◽  
Almost All

Abstract We studied recruitment and dispersal of White-tailed Ptarmigan (Lagopus leucurus) breeding in naturally fragmented alpine habitats at four study sites in Colorado from 1987–1998. Almost all recruitment for both sexes, particularly females, was of birds produced outside local populations and also external to nearby studied populations. Populations were more dependent on female recruitment than on male recruitment to sustain them, and patterns of recruitment were not correlated with local survival of adults or production of young the previous year, except at one site for females. Over 95% of recruits were yearlings. Breeding dispersal of adults, an infrequent but regular event, was also important to inter-population connectivity. Our data for multiple populations allowed us to describe movement patterns among populations to assess consistency with conditions required for a rescue system. After widespread reproductive failure in one year, we expected all populations the next year would have low recruitment due to a reduced supply of recruits produced in the region. Recruitment was low, but impact varied among populations. We conducted an over-winter study of radio-marked offspring to determine possible influences of winter site location and relatives on recruitment patterns. Contrary to expectation, offspring remained on or near breeding sites in winter, but were not located near their mothers or siblings. Recruitment location was related to winter site location. White-tailed Ptarmigan exhibit a well developed capacity for external recruitment that allows them to persist in small populations with stochastic conditions for breeding and survival. Extensive external recruitment may be a general pattern for birds.

United Front: Partisans of the Leningrad Region and their connections with the Central Asian Soviet Republics

2021 ◽  
Vol 2021 (02) ◽  
pp. 214-225
Author(s):  
Sergey Kulik ◽  
Аnatoliy Kashevarov ◽  
Zamira Ishankhodjaeva
Keyword(s):  
World War Ii ◽  
Weather Conditions ◽  
Leningrad Region ◽  
World War ◽  
North West ◽  
The North ◽  
Occupied Territory ◽  
Central Asian ◽  
The Difference ◽  
Almost All

During World War II, representatives of almost all the Soviet Republics fought in partisan detachments in the occupied territory of the Leningrad Region. Among them were many representatives of the Central Asian republics: Kazakhstan, Kyrgyzstan and Uzbekistan. Many Leningrad citizens, including relatives of partisans, had been evacuated to Central Asia by that time. However, representatives of Asian workers’ collectives came to meet with the partisans. The huge distance, the difference in cultures and even completely different weather conditions did not become an obstacle to those patriots-Turkestanis who joined the resistance forces in the North-West of Russia.

Marine Atmospheric Corrosion of Additively Manufactured Stainless Steels

CORROSION ◽  
10.5006/3793 ◽  
2021 ◽  
Author(s):  
Michael Melia ◽  
Jesse Duran ◽  
Jason Taylor ◽  
Francisco Presuel-Moreno ◽  
Rebecca Schaller ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Atmospheric Corrosion ◽  
Laboratory Experiments ◽  
Dislocation Cell ◽  
Eastern Coast ◽  
Melt Pool ◽  
Cell Structures ◽  
Cellular Microstructure

Additively manufactured (AM) stainless steels exhibit numerous microstructural differences compared to their wrought counterparts, such as Cr enriched dislocation cell structures. The influence these unique features have on a SSs corrosion resistance are still under investigation with most current works limited to laboratory experiments. The work herein shows the first documented study of AM 304L and 316L exposed to a severe marine environment on the eastern coast of Florida with comparisons made to wrought counterparts. Coupons were exposed for 21 months and resulted in significant pitting corrosion to initiate after 1 month of exposure for all conditions. At all times, the AM coupons exhibited lower average and maximum pit depths than their wrought counterparts. After 21 months, pits on average were 4 μm deep for AM 316L specimen and 8 μm deep for wrought specimen. Pits on the wrought samples tended to be nearly hemispherical and polished with some pits showing crystallographic attack while pits on AM coupons exhibited preferential attack at melt pool boundaries and the cellular microstructure.

scholarly journals Treatment of children and adolescents with hemangioma using propranolol: preliminary results from a retrospective study

2014 ◽  
Vol 132 (1) ◽  
pp. 48-54 ◽  
Author(s):  
Juliana Costa Albuquerque ◽  
Rosane Aline Magalhaes ◽  
Jamille Araujo Felix ◽  
Maria Vilani Rodrigues Bastos ◽  
Juvenia Bezerra Fontenele ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Children And Adolescents ◽  
Previous Treatment ◽  
Capillary Hemangioma ◽  
Response To Treatment ◽  
Vascular Tumors ◽  
Lesion Volume ◽  
Chi Square ◽  
One Year ◽  
Almost All

CONTEXT AND OBJECTIVE: Hemangiomas are the commonest vascular tumors during childhood. In 2008, the effect of propranolol for treating capillary hemangiomas was demonstrated. Other similar results followed, showing that it rapidly reduces lesion volume. The objective here was to evaluate children and adolescents with hemangiomas that were treated with propranolol. DESIGN AND SETTING: Retrospective study, conducted in a children's hospital. METHODS : Patients aged 0-19 years with or without previous treatment, who were treated between January 2009 and December 2010, were included. The response was assessed by comparing the lesion appearance between the start of treatment and the last consultation. We considered partial or complete responses as the response to treatment. RESULTS : Sixty-nine patients with a median follow-up of 11 months (mean age: 31 months) were included. Of these, 58 patients were recently diagnosed and 11 had had previous treatment. A response (partial or complete) was seen in 60 patients (87%). Among the capillary hemangioma cases, responses were seen in 50 out of 53 (94%), while in other lesion types, it was 10 out of 16 (63%) (P = 0.3; chi-square). Responses in patients less than one year of age were seen in 37 out of 38 (97%), whereas in those over one year of age, in 23 out of 31 (74%) (P = 0.4; chi-square). Side effects were uncommon and mild. CONCLUSIONS: Propranolol seemed to be effective for treatment of hemangiomas in children and adolescents, and not just in the proliferative stage, with responses in almost all the patients.

Scholarly skills as everyday practice – implications for education

2016 ◽  
Vol 6 (3) ◽  
pp. 224-236
Author(s):  
Inga Wernersson ◽  
Monica Hansen Orwehag
Keyword(s):  
Teacher Education ◽  
Critical Thinking ◽  
Professional Education ◽  
Design Education ◽  
Research Question ◽  
Work Practice ◽  
Content Type ◽  
Analytical Skills ◽  
One Year ◽  
Almost All

Purpose – The purpose of this paper is to understand how teachers, nurses and engineers view the use of scholarly skills, such as research and critical thinking, in occupational practice and what implications this understanding may have for (especially) teacher education. Design/methodology/approach – Engineers, nurses and teachers who had worked for at least one year after their education was interviewed (telephone interviews). Four interviews from each category were made in this exploratory study. Findings – Few of the interviewees spontaneously connect their research methods training or other elements of scientific thinking in their education to everyday work practice, but all give examples of systematic, reflective and critical elements as features present in the occupational context. Almost all also view the final thesis work done in their respective programmes as a gratifying experience. Further, they describe the freedom and independence they have in their choice of research question and form of work as appealing and encouraging. Research limitations/implications – The study is exploratory and the results should be used to develop ideas about how to improve scholarly/scientific training in profession-oriented higher education programmes. Practical implications – This paper explore ways to understand and further develop the teaching of scholarly/scientific attitudes and ways of thinking in profession-oriented university programmes. Social implications – Scholarly skills such as critical thinking, analytical skills and awareness of different perspectives are important in all professions. How to design education to optimize such skills is important for people and society. Originality/value – The value of the study is that it is a try to use experiences from different fields to improve the generic scholarly aspects of professional education (especially teacher education).

scholarly journals Туризам и привредни опоравак // Tourism and economic recovery

2014 ◽  
Vol 12 (20) ◽  
pp. 103
Author(s):  
Марко Шантић ◽  
Брано Маркић ◽  
Сања Бијакшић
Keyword(s):  
Foreign Exchange ◽  
Geographic Location ◽  
Standard Of Living ◽  
The Past ◽  
Indirect Impact ◽  
Basic Functions ◽  
Almost All ◽  
Export Industries ◽  
General Standard ◽  
New Jobs

Резиме: Сектор туризма у БиХ има позитивне трендове у свим битним показатељима раста у посљедњих десет година, међутим још увијек постоји огроман простор за даљње коришћење његовог потенцијала. Са својим природним богатствима и потенцијалом за туризам на отвореном, богатом природном и културном баштином, добрим географским положајем, међународно познатим манифестацијама, изврсном гастрономском понудом по прихватљивим цијенама и статусом још увијек непознатог туристичког одредишта за главна емитивна тржишта, БиХ има све предиспозиције за изузетно успјешан туризам. Туризам је засигурно јако значајан извор девизних средстава, те се управо из тог разлога сврстава у извозне гране које се фаворизују. За земље које су се, прије свега, издвојиле као значајне рецептивне туристичке земље на међународном туристичком тржишту, девизни прилив од туризма представља најважнију ставку прихода у платном билансу и веома снажан фактор укупног развоја привреде. Туризам представља изузетно важну компоненту националне економије. Сектор је чији се значај не може прецизно квантификовати управо зато што је повезан са скоро свим аспектима друштва. Једна од основних функција туризма је што директно и индиректно утиче на раст бруто домаћег производа. Упоредо са јачањем његовог економског аспекта подстиче се запошљавање, утиче на отварање нових радних мјеста што се одражава на побољшање општег животног стандарда. На јединствен начин подстиче развој неких од комплементарних дjелатности и доприноси укупном БДП-у.Summary: Tourist sector in BiH has positive trends in all important growth indicators in the past decade, however, the space for using further its potential is still huge. With its natural resources and potential for outdoors tourism, rich natural and cultural heritage, good geographic location, internationally known events, excellent cuisine for reasonable prices and status of a still unknown tourism destination for main tourist generating markets, BiH has all predispositions for exceptionally successful tourism. Tourism is, certainly, a very important source of foreign exchange and for this reason is classified in favored export industries. For countries which, first of all, are outstanding as significant receptive tourism countries on the international tourism market, foreign exchange inflow from tourism represents the most important item of revenue in the balance of payment and a very strong factor in overall economic development.Tourism is an extremely important component of the national economy. It is a sector whose importance cannot be quantified precisely since it is related to almost all aspects of the society. One of the basic functions of tourism is its direct and indirect impact on the growth of gross domestic product. Along with the strengthening of its economic aspect the employment is being encouraged, affects creating new jobs which is reflected in the improvement of general standard of living. In a unique way it encourages development of other complementary activities and contributes to the overall GDP. 

scholarly journals Effects of Actual Marine Atmospheric Pre-Corrosion and Pre-Fatigue on the Fatigue Property of 7085 Aluminum Alloy

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 81
Author(s):  
Laixin Shi ◽  
Lin Xiang ◽  
Jianquan Tao ◽  
Jun Liu ◽  
Qiang Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Pitting Corrosion ◽  
Atmospheric Corrosion ◽  
Fatigue Property ◽  
Outdoor Exposure ◽  
Fatigue Tests ◽  
Constant Amplitude ◽  
Fatigue Fractography ◽  
Corrosion Mode

Effects of actual marine atmospheric precorrosion and prefatigue on the fatigue property of 7085-T7452 aluminum alloy were investigated by using the methods of marine atmospheric outdoor exposure tests and constant amplitude axial fatigue tests. Marine atmospheric corrosion morphologies, fatigue life, and fatigue fractography were analyzed. After three months of outdoor exposure, both pitting corrosion and intergranular corrosion (IGC) occurred, while the latter was the dominant marine atmospheric corrosion mode. Marine atmospheric precorrosion could result in a dramatical decrease in the fatigue life of the as-received 7085-T7452 aluminum alloy, while selective prefatigue can improve the total fatigue life of the precorroded specimen. The mechanism of the actual marine atmospheric corrosion and its effects on the fatigue life of the 7085-T7452 aluminum alloy were also discussed.

scholarly journals PEMANFAATAN DATA SATELIT HIMAWARI-8 SERTA DATA CURAH HUJAN DAN HARI HUJAN BULANAN DALAM ANALISIS KEJADIAN BANJIR KOTA PADANG, 9 SEPTEMBER 2017 DAN 26 SEPTEMBER 2018

2019 ◽  
Vol 3 ◽  
pp. 264
Author(s):  
Vinca Amalia Rizkiafama ◽  
Tesla Kadar Dzikiro ◽  
Agus Safril
Keyword(s):  
Satellite Data ◽  
Atmospheric Stability ◽  
Convective Cloud ◽  
Atmospheric Conditions ◽  
Flood Events ◽  
Growth Activity ◽  
One Year ◽  
Almost All ◽  
The City ◽  
Rainy Days

<p class="AbstractEnglish"><strong>Abstract:</strong> Flood events on Wednesday, September 26, 2018, in several sub-districts in the city of Padang showed different conditions with the Indonesian region in general which were in normal to drier conditions. One year earlier, precisely on September 9, 2017, there were floods in almost all areas of the city of Padang. This study aims to determine the atmospheric conditions during flood events from the climatological and meteorological side. The data used are monthly rainfall and a monthly number of Rainy Days (HH) from 1981-2018 from the Minangkabau Meteorological Station, as well as Himawari-8 Weather Satellite data. Satellite data is processed using Satellite Animation and Interactive Diagnosis (SATAID) software to obtain cloud cover analysis, cloud growth activities, and atmospheric lability levels. September 2017 and September 2018 are in the nature of normal rain with a percentage of 101% and 88%. The increase in the amount of rainfall in August 2017 to September 2017 is not significant at 27 mm compared to August 2018 to September 2018 which is significant at 148 mm. The number of rainy days in September 2017 and 2018 were 24 and 23 respectively, which showed that almost every day there was rain in those months. The meteorological analysis shows that there is convective cloud growth activity in the Padang area which is characterized by an unstable level of atmospheric stability which has the potential for moderate to heavy rainfall.</p><p class="KeywordsEngish"><strong>Abstrak:</strong> Kejadian banjir pada Rabu, 26 September 2018 di beberapa kecamatan di Kota Padang menunjukkan kondisi yang berlainan dengan wilayah Indonesia pada umumnya yang berada dalam kondisi normal hingga lebih kering. Satu tahun sebelumnya, tepatnya pada 9 September 2017 juga terjadi banjir hampir di seluruh wilayah Kota Padang. Penelitian ini bertujuan untuk mengetahui kondisi atmosfer pada saat kejadian banjir dari sisi klimatologis dan meteorologisnya. Data yang digunakan adalah curah hujan bulanan dan jumlah Hari Hujan (HH) bulanan dari tahun 1981-2018 dari Stasiun Meteorologi Minangkabau, serta data Satelit Cuaca Himawari-8. Data satelit diolah menggunakan piranti lunak Satellite Animation and Interactive Diagnosis (SATAID) untuk mendapatkan analisis tutupan awan, aktivitas pertumbuhan awannya, dan tingkat labilitas atmosfer. September 2017 dan September 2018 berada pada sifat hujan normal dengan presentase 101% dan 88%. Peningkatan jumlah curah hujan bulan Agustus 2017 ke September 2017 tidak signifikan yaitu sebesar 27 mm dibandingkan Agustus 2018 ke September 2018 yang signifikan yaitu sebesar 148 mm. Jumlah hari hujan di bulan September 2017 dan 2018 berturut-turut sebesar 24 dan 23 yang menunjukkan bahwa hampir setiap hari terjadi hujan di bulan-bulan tersebut. Analisis secara meteorologis menunjukkan bahwa terdapat aktivitas pertumbuhan awan konvektif di daerah Padang yang ditandai dengan tingkat stabilitas atmosfer yang labil sehingga berpotensi terjadinya hujan sedang hingga lebat.</p>

scholarly journals CREATING MULTI-TEMPORAL MAPS OF URBAN ENVIRONMENTS FOR IMPROVED LOCALIZATION OF AUTONOMOUS VEHICLES

2020 ◽  
Vol XLIII-B2-2020 ◽  
pp. 317-323
Author(s):  
J. Schachtschneider ◽  
C. Brenner
Keyword(s):  
Urban Areas ◽  
Autonomous Vehicles ◽  
Weather Conditions ◽  
Point Clouds ◽  
Urban Environments ◽  
Seasonal Effects ◽  
Data Set ◽  
Multi Temporal ◽  
One Year

Abstract. The development of automated and autonomous vehicles requires highly accurate long-term maps of the environment. Urban areas contain a large number of dynamic objects which change over time. Since a permanent observation of the environment is impossible and there will always be a first time visit of an unknown or changed area, a map of an urban environment needs to model such dynamics.In this work, we use LiDAR point clouds from a large long term measurement campaign to investigate temporal changes. The data set was recorded along a 20 km route in Hannover, Germany with a Mobile Mapping System over a period of one year in bi-weekly measurements. The data set covers a variety of different urban objects and areas, weather conditions and seasons. Based on this data set, we show how scene and seasonal effects influence the measurement likelihood, and that multi-temporal maps lead to the best positioning results.

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