Journal of the Union of Scientists - Varna. Maritime Sciences Series最新文献_第2页

Challenges to contemporary maritime building 当代海事建筑面临的挑战

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2019-12-05 DOI: 10.14748/isuvmn.v0i0.6498

Valentina Grancharova, S. Lutzkanova

引用次数: 0

Air-imperviousness of reinforced concrete floating caisson type pneumo-structure 钢筋混凝土浮箱式隔气结构的透气性

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2019-12-05 DOI: 10.14748/isuvmn.v0i0.6500

G. Georgiev

{"title":"Air-imperviousness of reinforced concrete floating caisson type pneumo-structure","authors":"G. Georgiev","doi":"10.14748/isuvmn.v0i0.6500","DOIUrl":"https://doi.org/10.14748/isuvmn.v0i0.6500","url":null,"abstract":"This paper gives a brief description of a new type of floating caisson, structure, applicable in hydrotechnical construction of facilities subjected to heavy loadings in water areas, practically by every kind of a baseplate in shallow and deep water. The caisson has a prismatic or cylindrical form and no bottom. It is divided in vertical chambers and is provided with top plate (cover). The caisson is transported in a floating condition to the lay place. It is possible to introduce slight corrections of the caisson trim and its exact laying on a particular place by varying the air pressure in the chambers. One of the most important things in the construction and operation of concrete-type pneumatic structures is to provide air- imperviousness of the structure for air pressure values up to 2 bar (0.2 MPa). It is believed that the reinforced concrete walls and slabs, properly executed and vibrated, are air-tight even without plaster on them. Nevertheless, the prescribed requirements for the insulation and the provision of airtightness of reinforced concrete must be fully met in combination with varying outside temperature and the constant impact of aggressive seawater.","PeriodicalId":286678,"journal":{"name":"Journal of the Union of Scientists - Varna. Maritime Sciences Series","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125363397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Maritime critical infrastructure cybersecurity aspects overview 海上关键基础设施网络安全方面概述

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2019-12-05 DOI: 10.14748/isuvmn.v0i0.6497

Zhelyazko Nikolov

引用次数: 0

Application of Daniel Goleman's model components for emotional intelligence in leadership training for NU Vaptsarov courses Daniel Goleman的情绪智力模型成分在NU Vaptsarov课程领导力训练中的应用

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2019-12-05 DOI: 10.14748/isuvmn.v0i0.6499

Anna Karadencheva

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Submarine springs on the Bulgarian Black Sea coast 保加利亚黑海沿岸的海底温泉

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2019-12-05 DOI: 10.14748/isuvmn.v0i0.6502

K. Gartsiyanova

引用次数: 0

Vertical structure of seasonal climatic fields of the sea water temperature and salinity in front of the Bulgarian Black Sea coast 保加利亚黑海海岸前海水温度和盐度的垂直季节性气候场结构

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2018-12-31 DOI: 10.14748/isuvmn.v0i0.5816

Dimitar Trukhchev, Radostin Naydenov

{"title":"Vertical structure of seasonal climatic fields of the sea water temperature and salinity in front of the Bulgarian Black Sea coast","authors":"Dimitar Trukhchev, Radostin Naydenov","doi":"10.14748/isuvmn.v0i0.5816","DOIUrl":"https://doi.org/10.14748/isuvmn.v0i0.5816","url":null,"abstract":"Refined results from climatic seasonal averaging of data from multi-years in-situ measurements of fields of the water temperature T and salinity S are presented. The historical data set used consists of more than 21000 hydrological stations and is built on the base of information from SeaDataNet infrastructure. The vertical hydrological structure of the coastal, open shelf, continental slope, and deep-sea water in front of the Bulgarian coast stretching 32EsE is described. As distinct from both the most complete of the present-day hydrological arrays prepared by V. Tuzhilkin and V. Belokopitov on a regular horizontally mesh for the entire Black sea basin, in this study the water area is divided into several regions according to their hydrodynamical and oceanographical characteristics. The layer`s centers between next horizons: 0, 10, 20, 30, 50, 80, 120, 180, 250, 350, 500, 800, 1000, 1250, 1500, 2250 m are used describing the vertical peculiarities of T and S from the seasurface to the bottom. Principal features of the seasonal climatic variability of the thermohaline fields in the study water area are shown. The results obtained give possibility for assessments in wide range of fields relevant to external effects both from natural and anthropogenic character upon the marine environment.","PeriodicalId":286678,"journal":{"name":"Journal of the Union of Scientists - Varna. Maritime Sciences Series","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127854150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Macrosynthetic plastic waste in the Black Sea surface waters and the phenomenon â€žplastic cloud` 黑海地表水中的大型合成塑料废物与<s:2>€žplastic云”现象

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2018-12-31 DOI: 10.14748/isuvmn.v0i0.5821

T. Trayanov

引用次数: 0

Method for preliminary crossing, niveling of flowering caisson type pneumo-structure and pressure of the Earth basis 开花沉箱式充气结构的初步穿越、修整方法及地基压力

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2018-12-31 DOI: 10.14748/isuvmn.v0i0.5818

G. Georgiev

{"title":"Method for preliminary crossing, niveling of flowering caisson type pneumo-structure and pressure of the Earth basis","authors":"G. Georgiev","doi":"10.14748/isuvmn.v0i0.5818","DOIUrl":"https://doi.org/10.14748/isuvmn.v0i0.5818","url":null,"abstract":"The prediction of the cutting force of the knives of contouring hydraulic structures of the sinking type (caisson) is not solved unambiguously in hydrotechnical science, and its pre-fixation is impossible without additional, costly bottom processing, which leads to limited use of contemporary and economical conversions such as large-diameter pilots, floating bottomless moorings and other gravitational hydraulic constructions with contour interactions with the bottom. The essence of the problem is to create a method of designing the basic contour of a new type of floating caisson, leveling a gear made up of one or more caissons, a continuous consolidation of the earth's foundation under the main caisson contour, pre-stressing of the ground foundation the main caisson contour with loads greater than operational in case of necessity of subsequent filling with another contractor by raising a water column above the average water level in the caissons working chambers after laying on the bottom, keeping the raised water volume above the average water level to the project elevation, redistributing the weight of the raised and retained water volume as a gravity fill in operating conditions.","PeriodicalId":286678,"journal":{"name":"Journal of the Union of Scientists - Varna. Maritime Sciences Series","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126475267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Morphometric, quantitative and population characteristics oF Rapana venosa (Valenciennes, 1846) in front of Pasha Dere Pasha ere前的Rapana venosa (valciennes, 1846)的形态、数量和种群特征

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2018-12-31 DOI: 10.14748/isuvmn.v0i0.5820

A. Trayanova

{"title":"Morphometric, quantitative and population characteristics oF Rapana venosa (Valenciennes, 1846) in front of Pasha Dere","authors":"A. Trayanova","doi":"10.14748/isuvmn.v0i0.5820","DOIUrl":"https://doi.org/10.14748/isuvmn.v0i0.5820","url":null,"abstract":"A total of 468 individuals of the rapa whelk (Rapana venosa) were studied in terms of size, weight and sex in the sea area in front of Pasha dere (south of Varna Bay, Black Sea) in the summer of 2016. Sampling was performed by bottom trawling on three transects at different depths (from 9.0 m to 24.5 m) and different type of substrate (sand, sandy silt and silt). In the present study the average length was 6.36 cm and the absolute shell length ranged from a minimum of 3.24 cm to a maximum of 9.68 cm. The established average total weight was 47.31 g, its absolute value ranging from 9.98 g to 135.02 g. The average values of the shell length and total weight of the rapa whelk were the lowest on shallow sandy bottom (6.01 cm and 41.94 g, respectively) and the highest at 21 m depth on silty sediments (6.84 cm and 55.13 g, respectively). The size-weight relationship between all individuals was described by the formula W = 0.248L 2.797 (R 2 = 0.937), with the allometric coefficient (b) ranging from 2.817 to 3.066. On the sandy sediment, the male: female ratio was 2:1; in sandy silt, the percentages of male and female specimens were 55% and 45% respectively, and in silty sediment the sex ratio was 1:1. The male specimens were characterized by higher values of all morphometric parameters compared to the females. In the size distribution of sexes, the highest was the frequency of the males in size class of 6-7 cm, and the females with 5-6 cm shell length. In the weight distribution of the males, the individuals with total weight in the range 30-40 g dominated, while the prevailing female individuals weighed between 20 g and 30 g.","PeriodicalId":286678,"journal":{"name":"Journal of the Union of Scientists - Varna. Maritime Sciences Series","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114491157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sources of groundwater pollution in Bulgarian Black Sea coast 保加利亚黑海沿岸地下水污染源

Journal of the Union of Scientists - Varna. Maritime Sciences Series Pub Date : 2018-12-31 DOI: 10.14748/isuvmn.v0i0.5819

K. Gartsiyanova

引用次数: 0