scholarly journals HYDRAULIC STABILITY AND OVERTOPPING PERFORMANCE OF A NEW TYPE OF REGULAR PLACED ARMOR UNIT

2018 ◽  
Vol 1 (36) ◽  
pp. 54
Author(s):  
Bas Reedijk ◽  
Tamara Eggeling ◽  
Pieter Bakker ◽  
Robert Jacobs ◽  
Markus Muttray
Keyword(s):  
Failure Mechanisms ◽  
Single Layer ◽  
Model Tests ◽  
Roughness Coefficient ◽  
Regular Pattern ◽  
Wave Loading ◽  
The World ◽  
New Type ◽  
The Stability ◽  
Hydraulic Stability

Single layer, randomly placed, interlocking concrete units are widely used for the protection of exposed breakwaters. Based on 15 years of experience with Xbloc projects around the world, DMC started the development of an armour unit called XblocPlus. XblocPlus is a single layer concrete unit which is placed in a regular pattern. An essential part of this development were hydraulic model tests in 2D and in 3D to determine the hydraulic stability under wave loading and the overtopping volumes for the new units. These studies and the results regarding the stability, failure mechanisms and roughness coefficient are described in this paper.

scholarly journals HYDRAULIC STABILITY AND OVERTOPPING PERFORMANCE OF A NEW TYPE OF REGULAR PLACED ARMOR UNIT

2018 ◽  
pp. 111
Author(s):  
Bas Reedijk ◽  
Tamara Eggeling ◽  
Pieter Bakker ◽  
Robert Jacobs ◽  
Markus Muttray
Keyword(s):  
Wave Height ◽  
Single Layer ◽  
Model Tests ◽  
Roughness Coefficient ◽  
Design Wave Height ◽  
Wave Heights ◽  
New Type ◽  
Adverse Influence ◽  
2D And 3D ◽  
Hydraulic Stability

The XblocPlus is a new type of interlocking single layer armour units that is placed with uniform orientation. This is novel and different from all other single layer, interlocking armouring systems. The hydraulic stability of the XblocPlus breakwater armour unit was tested in 2D and 3D hydraulic model tests. Wave overtopping tests were performed to determine the roughness coefficients of the EurOtop overtopping formula for the XblocPlus. Model tests on a rubble mound breakwater with XblocPlus armour included 2D tests with a 1:30 seabed slope and with 1:2 and 3:4 breakwater slopes and 3D model tests with a flat seabed and with a 3:4 breakwater slope. Wave heights up to 150% of the design wave height were tested in the 2D tests and up to 200% with wave directions 0° to 60° in the 3D tests. No armour unit displacements were observed in 2D tests with 1:2 slope. In the 2D tests with 3:4 slope one armour unit was displaced when the wave height reached 159% of the design wave height. No damage to the XblocPlus armour layer was observed in the 3D tests. A roughness coefficient of 0.45 was deduced from overtopping tests with wave heights of 60% to 100% of the design wave height. The model test results indicate little or no influence of wave steepness on XblocPlus stability and no adverse influence of wave obliquity while the seabed slope in front of the breakwater may have some impact on the XblocPlus armour layer stability.

scholarly journals STABILITY OF INTERLOCKING ARMOUR UNITS ON A BREAKWATER CREST

2012 ◽  
Vol 1 (33) ◽  
pp. 11 ◽  
Author(s):  
Ilse Van den Bosch ◽  
Erik Ten Oever ◽  
Pieter Bakker ◽  
Markus Muttray
Keyword(s):  
Wave Height ◽  
Water Depth ◽  
Packing Density ◽  
Single Layer ◽  
Hydraulic Model ◽  
Model Tests ◽  
Wave Steepness ◽  
Design Wave Height ◽  
The Stability ◽  
Hydraulic Stability

The hydraulic stability of single layer, interlocking armour units on low crested and submerged breakwaters was investigated in 2D hydraulic model tests. Displacements of armour units and rocking were monitored and have been applied as indicators for the armour layer stability on the crest, front and rear slope. The effect of freeboard, packing density and wave steepness on the armour layer stability have been investigated. The stability of interlocking concrete armour units on low crested and submerged structures is qualitatively different from rock armour. About 40% to 50% larger armour units are required on the seaward slope and crest of low crested structures (as compared to conventional high crested breakwaters). About 35% larger armour units are required on the rear slope. Larger armour units are not required on submerged breakwaters if the water depth on the crest exceeds 50% of design wave height.

The Stability of Elliptic Paraboloid Grid Shell Lighting Roofs with Semi-Rigid Joints

2011 ◽  
Vol 374-377 ◽  
pp. 2148-2151 ◽  
Author(s):  
Ruo Qiang Feng ◽  
Bin Yao ◽  
Ji Hong Ye
Keyword(s):  
Bearing Capacity ◽  
Single Layer ◽  
Initial Imperfection ◽  
Parametric Modeling ◽  
Elliptic Paraboloid ◽  
Grid Shell ◽  
Steel Bars ◽  
New Type ◽  
The Stability ◽  
Rigid Joints

Grid shell is a new type of single layer latticed shell. Joint connections of this structrue always adopt semi-rigid joints: in-plane pin joints, out-plane rigid joints. A parametric modeling method using self-designed program is proposed in this paper. Bearing capacity of the elliptic paraboloid grid shell with semi-rigid joints is analyzed. Then, the influence of section of steel bars, rise-span ratio and initial imperfection on the bearing capacity is investigated.

scholarly journals Labor, gender and governance in terms of establishment of new technological order

2021 ◽  
Vol 125 ◽  
pp. 02009
Author(s):  
Liudmila Aleksandrovna Vasilenko ◽  
Sergey Vladimirovich Vasilenko
Keyword(s):  
Labor Market ◽  
Social Space ◽  
Social Institutions ◽  
Value System ◽  
Social Actors ◽  
The Social ◽  
The World ◽  
New Type ◽  
The Stability ◽  
The Impact

The prerequisites for the study are the transition of the world social system to the Technological Orders VI and VII in the context of a digital breakthrough and the hybrid nature of the digital social space, which significantly affects the change in the social structure, the distribution of social roles in society, the formation of the labor market and the formation of a new gender order. The purpose of the study is to analyze the impact of digitalization on the labor market, on the gender balance in the labor market and formulate how the processes of preparing a person for new technological structures should be built. According to the results of the study, the authors note that the formation of social institutions of a new type in a hybrid digital society significantly lags behind the need, digital regulators of social behavior in the labor market have not yet emerged, which does not allow building norms and rules of life in a virtual social space at the legislative level. The cognitive structures of society are immature, adequate incentives and sanctions as a response to the phenomena of crossing the boundaries of the office set framework by social actors have not been formed. There are no frameworks yet, but they can be created by maintaining a balance between the realization of society’s needs for development and relying on its ability to maintain the stability of the value system, i.e. property of resistance.

COVID 19: REALS AND CHALLENGES AGAINST DOCTORS

2020 ◽  
Vol 2 (1) ◽  
pp. 65-87
Author(s):  
Zen Ahmad
Keyword(s):  
Virus Disease ◽  
Clinical Manifestations ◽  
World Health ◽  
Unknown Etiology ◽  
Wuhan City ◽  
Traditional Markets ◽  
Pneumonia Case ◽  
The World ◽  
New Type ◽  
Health Organization

Corona Virus Disease (Covid-19) is a contagious disease caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) which was discovered in December 2019 in China. This disease can cause clinical manifestations in the airway, lung and systemic. The World Health Organization (WHO) representative of China reported a pneumonia case with unknown etiology in Wuhan City, Hubei Province, China on December 31, 2019. The cause was identified as a new type of coronavirus on January 7, 2020 with an estimated source of the virus from traditional markets (seafood market). ) Wuhan city

Unveiling the Theoretical Mistakes in the World Bank Formation and its Implication on Survival of Africa Monetary Union

2019 ◽  
Vol 10 (1) ◽  
pp. 119-124
Author(s):  
Olatunji Abdul Shobande ◽  
Kingsley Chinonso Mark
Keyword(s):  
World Bank ◽  
Monetary Union ◽  
Political Interest ◽  
World Bank Group ◽  
Policy Makers ◽  
The World Bank ◽  
The World ◽  
Bank Group ◽  
The Stability ◽  
Developed Nations

Abstract The quest for urgent solution to resolve the world liquidity problem has continued to generate enthusiastic debates among political economists, policy makers and the academia. The argument has focused on whether the World Bank Group was established to enhance the stability of international financial system or meant to enrich the developed nations. This study argues that the existing political interest of the World Bank Group in Africa may serve as lesson learned to other ambitious African Monetary Union.

Myths about COVID-19

2020 ◽  
Vol 11 (SPL1) ◽  
pp. 907-912
Author(s):  
Deepika Masurkar ◽  
Priyanka Jaiswal
Keyword(s):  
World Health ◽  
Indian Society ◽  
Common People ◽  
The World ◽  
New Type ◽  
The Media ◽  
Personal Level ◽  
Novel Virus ◽  
The Common ◽  
Health Organization

Recently at the end of 2019, a new disease was found in Wuhan, China. This disease was diagnosed to be caused by a new type of coronavirus and affected almost the whole world. Chinese researchers named this novel virus as 2019-nCov or Wuhan-coronavirus. However, to avoid misunderstanding the World Health Organization noises it as COVID-19 virus when interacting with the media COVID-19 is new globally as well as in India. This has disturbed peoples mind. There are various rumours about the coronavirus in Indian society which causes panic in peoples mind. It is the need of society to know myths and facts about coronavirus to reduce the panic and take the proper precautionary actions for our safety against the coronavirus. Thus this article aims to bust myths and present the facts to the common people. We need to verify myths spreading through social media and keep our self-ready with facts so that we can protect our self in a better way. People must prevent COVID 19 at a personal level. Appropriate action in individual communities and countries can benefit the entire world.

Application of the method of mathematical modeling for forecasting channel deformations at the underwater crossing of the main pipeline

2020 ◽  
Vol 10 (6) ◽  
pp. 599-609
Author(s):  
Valery А. Gruzdev ◽  
◽  
Georgy V. Mosolov ◽  
Ekaterina A. Sabayda ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Roughness Coefficient ◽  
Computational Domain ◽  
Channel Deformations ◽  
Geological Surveys ◽  
Kuban River ◽  
The Stability ◽  
Protective Structures

In order to determine the possibility of using the method of mathematical modeling for making long-term forecasts of channel deformations of trunk line underwater crossing (TLUC) through water obstacles, a methodology for performing and analyzing the results of mathematical modeling of channel deformations in the TLUC zone across the Kuban River is considered. Within the framework of the work, the following tasks were solved: 1) the format and composition of the initial data necessary for mathematical modeling were determined; 2) the procedure for assigning the boundaries of the computational domain of the model was considered, the computational domain was broken down into the computational grid, the zoning of the computational domain was performed by the value of the roughness coefficient; 3) the analysis of the results of modeling the water flow was carried out without taking the bottom deformations into account, as well as modeling the bottom deformations, the specifics of the verification and calibration calculations were determined to build a reliable mathematical model; 4) considered the possibility of using the method of mathematical modeling to check the stability of the bottom in the area of TLUC in the presence of man-made dumping or protective structure. It has been established that modeling the flow hydraulics and structure of currents, making short-term forecasts of local high-altitude reshaping of the bottom, determining the tendencies of erosion and accumulation of sediments upstream and downstream of protective structures are applicable for predicting channel deformations in the zone of the TLUC. In all these cases, it is mandatory to have materials from engineering-hydro-meteorological and engineering-geological surveys in an amount sufficient to compile a reliable mathematical model.

Performance of 4G-LTE Communication and Navigation System in Blended Wing-Body UAS

2019 ◽  
Vol 8 (4) ◽  
pp. 9538-9542
Keyword(s):  
Satellite Communication ◽  
Line Of Sight ◽  
Multiple Factors ◽  
The World ◽  
New Type ◽  
Blended Wing Body ◽  
4G Lte ◽  
The Right ◽  
And Control ◽  
Technology Demonstrator

In vision of searching for the right Unmanned Aerial System (UAS) for a specific mission, there are multiple factors to be considered by the operator such as mission, endurance, type of payload and range of the telemetry and control. This research is focusing on extending control range of the UAS by using 4G-LTE network to enable beyond-line-of-sight flying for the commercial UAS. Major UAS such Global Hawk, Predator MQ-1 are able to fly thousands of kilometers by the use of satellite communication. However, the satellite communication annual license subscription can be very expensive. With this situation in mind, a new type of flight controller with 4G-LTE communication has been developed and tested. Throughout the research, blended-wing-body (BWB) Baseline B2S is used as the platform for technology demonstrator. Result from this analysis has proven that the proposed system is capable to control a UAS from as far as United Kingdom, with a latency less than 881 ms in average. The new added capability can potentially give the commercial UAS community a new horizon to be able to control their UAS from anywhere around the world with the availability of 4G-LTE connection

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