scholarly journals Effect of the anchors' free length that made of tubular screw rods on the forces distribution in pile-anchor retaining structures on highways

2021 ◽  
Vol 8 (2) ◽  
Author(s):  
Nikolai Lubarsky ◽  
Darya Leyer
Keyword(s):  
Process Development ◽  
Cost Effective ◽  
Soil Mass ◽  
Design Solution ◽  
Test Scheme ◽  
Retaining Structures ◽  
Retaining Structure ◽  
Free Length ◽  
Landslide Processes ◽  
Landslide Process

Pile-supported retaining structures are widely used to protect road sections from landslide processes. The article describes the design and calculation peculiarities of pile-supported retaining structures reinforced with a drill and inject anchors from tubular screw rods. The authors considered two options for this type of anchors setup: without free length and with a pre-set free length. In the software geotechnical complex Plaxis, on the finite element method basis, mathematical modeling and calculation of a pile-supported anchor retaining structure with different free anchors lengths from tubular screw rods for various soils types have been performed. Numerical relationships have been obtained between the anchors' free length and the resulting forces in the retaining structure. The performed calculations series of the test scheme showed that with an increase in the free anchors' length in the retaining structure, there is a decrease in the applied load in its load-bearing elements due to the horizontal displacements growth. The article presents the survey results of a real road section, on which a landslide displacement is being prepared, and considers a design solution for a pile-supported anchor retaining structure to ensure its safe operation. Performed a series of calculations for various landslide process development stages in this area showed that the effect of the anchors' free length also largely depends on the state of the adjacent soil mass. Obtained results clearly show that the design of a free length section for anchors made of tubular screw rods makes it possible to design more cost-effective pile-supported anchor holding structures without reducing their reliability.

scholarly journals Different Hatching Rates of Floodwater Mosquitoes Aedes sticticus, Aedes rossicus and Aedes cinereus from Different Flooded Environments

Insects ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 279
Author(s):  
Anders Lindström ◽  
Disa Eklöf ◽  
Tobias Lilja
Keyword(s):  
Tap Water ◽  
Soil Samples ◽  
Mosquito Larvae ◽  
Retaining Structures ◽  
Retaining Structure ◽  
Large Numbers ◽  
Random Samples ◽  
Nuisance Species ◽  
Flooding Events ◽  
Hatching Rates

In the lower Dalälven region, floodwater mosquitoes cause recurring problems. The main nuisance species is Aedes (Ochlerotatus) sticticus, but large numbers of Aedes (Aedes) rossicus and Aedes (Aedes) cinereus also hatch during flooding events. To increase understanding of which environments in the area give rise to mosquito nuisance, soil samples were taken from 20 locations from four environmental categories: grazed meadows, mowed meadows, unkept open grassland areas and forest areas. In each location 20 soil samples were taken, 10 from random locations and 10 from moisture retaining structures, such as tussocks, shrubs, piles of leaves, logs, and roots. The soil samples were soaked with tap water in the lab, and mosquito larvae were collected and allowed to develop to adult mosquitoes for species identification. Fewer larvae hatched from mowed areas and more larvae hatched from moisture retaining structure samples than random samples. The results showed that Aedes cinereus mostly hatch from grazed and unkept areas and hatched as much from random samples as from structures, whereas Aedes sticticus and Aedes rossicus hatched from open unkept and forest areas and hatch significantly more from structure samples. When the moisture retaining structures in open unkept areas where Aedes sticticus hatched were identified it was clear that they hatched predominantly from willow shrubs that offered shade. The results suggest that Ae. sticticus and Ae. cinereus favor different flooded environments for oviposition.

scholarly journals The role of unpaved roads in the formation of landslide processes (on the example of Voronezh region)

2020 ◽  
Vol 28 (1) ◽  
pp. 65-74
Author(s):  
Andrey N. Timofeev
Keyword(s):  
Soil Layer ◽  
Anthropogenic Activity ◽  
Unpaved Roads ◽  
Erosion Processes ◽  
Voronezh Region ◽  
Landslide Processes ◽  
Landslide Process ◽  
The Impact ◽  
Landslide Distribution

The article gives a brief description of the Voronezh region, provides data on the cause of landslides in its territory. The cyclical nature of landslide processes is noted, which in the region is on average 6-8 years. Attention is focused on anthropogenic activity, leading to the occurrence of creeping layers of the earth. The main causes of erosion processes are: significant plowing of the area (80%), which is not subject to the rules of anti-erosion agrotechnology; the irrational use of pastures and hayfields; an extensive gully-beam network. The role of temporary reservoirs formed in the ruts of unpaved roads, passing along the slopes and ravines, as a source of overmoistening of the soil layers and initiation of landslide processes is considered. The analysis of the landslide distribution over the territory of the Voronezh region and their dependence on the network of dirt roads is given. The areas of the Voronezh region were ranked by the number of landslide processes associated with the impact of a number of unpaved highways. Of the 32 districts of the region, according to this ranking, 12 are extremely dangerous, very dangerous and dangerous, and the same areas have a very extensive network of unpaved roads running near ravines, steep banks of rivers and ponds, where potentially flow of landslide processes. Dirt roads often have relatively deep ruts where melted or rainwater accumulates, forming local micro-ponds. Flowing to the waterproof layer, water saturates the soil layer, which can slide down the slope, forming a landslide process. It is necessary to predict the possibility of the occurrence of dangerous natural phenomena when laying automobile dirt roads.

scholarly journals Re Thinking the Public Toilet of Dhaka City: An Adaptable Prototype Design Solution to Improve the Existing Situation

2021 ◽  
Vol 9 (1) ◽  
pp. 1-14
Author(s):  
Syeda Faeza Hasan ◽  
Farjana Rahman
Keyword(s):  
Cost Effective ◽  
Design Solution ◽  
Design Strategies ◽  
Public Infrastructure ◽  
Urban Context ◽  
Human Waste ◽  
The Public ◽  
Hygiene Education ◽  
The City ◽  
Public Toilets

Dhaka is one of the fastest-growing cities in the world with a population of 21 million. With the constantly rising inhabitants, this urbanizing hub officially only has 122 public toilets, and in reality, most of them are not functional (Sanyal, November 05, 2016). Different studies also suggested that current situations of the public toilets in the city are unusable and unhygienic. Apart from a few good ones, most toilets have filthy floors, inadequate lighting and ventilation, and unbearable odor of human waste. Although unhygienic open defecation by men is a common scene in the city, for the woman it is not an option. While the city plans to construct a few, there still will be a huge need for public toilets to meet the demand of the vast population. It is critical to realize the challenges existing and evolving from the forbidding public hygiene situation and the lack of proper public infrastructure. Understanding the user group is crucial as modern and costly toilets end up being rejected than being used. Thus the paper tries to address the problems and suggests design strategies to achieve a feasible design solution for a sustainable public toilet that supports and empowers communal hygiene. The contribution of this paper is not only to promote a design solution but how this infrastructure can integrate with the surrounding urban context. A modular prototype is proposed which is adaptable, feasible, cost-effective, easy to erect, and can be plugged into any corner of the city. Rethinking public toilets as an adaptable prototype is not only about providing proper sanitation but also encouraging people about hygiene education, awareness, and innovation. The design is conceptualized as a prefabricated self-sustainable modular unit that can be altered, increased, or decreased as per the necessity of the surrounding area. 

Electroplating and Electroless Plating Process Development for DuPont™ GreenTape™ 9K7 LTCC

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000283-000287
Author(s):  
Allan Beikmohamadi ◽  
Steve Stewart ◽  
Jim Parisi ◽  
Mark McCombs ◽  
Michael Smith ◽  
...  
Keyword(s):  
Thick Film ◽  
Surface Finish ◽  
Electroless Plating ◽  
Process Development ◽  
Cost Effective ◽  
Electroless Nickel ◽  
Free Atmosphere ◽  
Gold Plating ◽  
Cost Effective Approach ◽  
Easy Integration

Low Temperature Co-fired Ceramic (LTCC) technology provides an attractive packaging platform for microwave and millimeter wave circuits and systems due to its unique properties. Generally, thick film gold or silver conductors are used as metallizations on LTCC substrates along with occasional use of copper thick films. This paper reports methods and results of extensive process development experiments DuPont Microcircuit Materials has undertaken to establish a commercially viable plating process for the market leading DuPont™ GreenTape™ 9K7 LTCC system. Both Electroplating and Electroless plating processes are investigated in this work. These techniques provide certain advantages when used in isolation or in combination with standard thick film metallizations, helping to extend their applicability. Electroplating of copper on LTCC provides a means of using copper as the external conductor without having to use complicated firing processes in oxygen-free atmosphere as required for copper thick film. This approach leads to a much more cost effective approach if copper is required as the external metal. Electroless Nickel/Gold plating (ENIG) of both silver and copper (electroplated and/or thick film) provides an industry standard, highly reliable, robust surface finish. Such surface finish enables easy integration of both soldering and wire bonding processes.

scholarly journals Timber sheet pile-vegetation model for stream bank retaining structure

2019 ◽  
Vol 92 ◽  
pp. 12013 ◽  
Author(s):  
Abhijith Kamath ◽  
Wolfgang Gard ◽  
Jan-Willem Van de Kuilen
Keyword(s):  
Riparian Vegetation ◽  
Root Systems ◽  
Physical Parameters ◽  
Preliminary Estimate ◽  
Sheet Pile ◽  
Vegetation Model ◽  
Mechanical Reinforcement ◽  
Retaining Structures ◽  
Retaining Structure ◽  
Stream Bank

Timber sheet piles are widely used to protect canal and stream banks. Quite often, riparian vegetation also grows along these retaining structures. Roots of riparian vegetation mechanically reinforce the soil with their root systems. A timber sheetpile- vegetation model is developed taking into account the mechanical reinforcement of the vegetation roots. The model uses easy to obtain physical parameters, which makes it suitable to have a preliminary estimate of how the forces on the bio engineered structure would evolve.

On Pipeline Lateral Buckling: Lessons Learned and Current Design Challenges

2012 ◽  
Author(s):  
Emil A. Maschner ◽  
Basel Abdalla
Keyword(s):  
Cost Effective ◽  
Lessons Learned ◽  
Operating Conditions ◽  
Design Solution ◽  
Lateral Buckling ◽  
Diverse Range ◽  
Applied Loading ◽  
Direct Design ◽  
Safety Margins ◽  
Global Buckling

The subject of lateral buckling design in recent years has by necessity become increasingly more involved as pipeline projects have moved into more difficult environments where there is a need for optimized economic solutions with assured through-life reliability. The authors have had direct design responsibility and specialist involvement with a large number of projects covering a diverse range of environments, single or PIP systems, variable product characteristics and operating conditions, external applied loading type, and geographical installation limitations. These include shallow and deep water, large thin walled and small thick walled diameter pipes, flat to undulating hard to soft seabed, variable cohesive and non-cohesive surficial soil types and various other project considerations which have impacted on the chosen design solution. The purpose of this paper will be to highlight aspects of global buckling design associated with reliable in place systems and conversely those aspects associated with integrity risks to the as-laid operational pipelines. A review of past project challenges along with a commentary as to the state of the art at the time gives an opportunity to evaluate risks and challenges being faced on current projects. Particularly, as it seeks to develop ever more cost effective designs with proven robustness but optimized safety margins for the installation and operation of HT/HP pipelines in marginal fields.

Trends in Precision Manufacturing Based on Intelligent Design and Advanced Metrology

2013 ◽  
Vol 581 ◽  
pp. 417-422 ◽  
Author(s):  
M. Numan Durakbasa ◽  
Gokcen Bas ◽  
Jorge Martin Bauer ◽  
Günther Poszvek
Keyword(s):  
Environmental Sustainability ◽  
Manufacturing Systems ◽  
Process Development ◽  
Raw Materials ◽  
Cost Effective ◽  
Intelligent Manufacturing ◽  
Production Engineering ◽  
Comprehensive Knowledge ◽  
Product And Process ◽  
The One

ts of extreme importance in present time of worldwide international competition in industry and production engineering to safe time on the one hand and on the other keep an eye on increasingly higher costs of energy and raw materials. Comprehensive knowledge in the areas of market requirements, product and process development and design, intelligent metrology and end of life management are important presuppositions to achieve rapid, agile, waste free and cost-effective production of innovative, customized complex products using next-generation materials as well as to protect the environment by making zero emissions and improve environmental sustainability and reduce the use of energy by using intelligent manufacturing systems.

Ultra Fine Pitch RDL Development in Multi-layer eWLB (embedded Wafer Level BGA) Packages

2015 ◽  
Vol 2015 (1) ◽  
pp. 000822-000826 ◽  
Author(s):  
Won Kyoung Choi ◽  
Duk Ju Na ◽  
Kyaw Oo Aung ◽  
Andy Yong ◽  
Jaesik Lee ◽  
...  
Keyword(s):  
High Performance ◽  
Process Development ◽  
Cost Effective ◽  
Access Point ◽  
Data Access ◽  
Memory Device ◽  
Logic Device ◽  
Wafer Level ◽  
Component Level ◽  
Fine Pitch

The market for portable and mobile data access devices connected to a virtual cloud access point is exploding and driving increased functional convergence as well as increased packaging complexity and sophistication. This is creating unprecedented demand for higher input/output (I/O) density, higher bandwidths and low power consumption in smaller package sizes. There are exciting interconnect technologies in wafer level packaging such as eWLB (embedded Wafer Level Ball Grid Array), 2.5D interposers, thin PoP (Package-on-Package) and TSV (Through Silicon Via) interposer solutions to meet these needs. eWLB technologies with the ability to extend the package size beyond the area of the chip are leading the way to the next level of high density, thin packaging capability. eWLB provides a robust packaging platform supporting very dense interconnection and routing of multiple die in very reliable, low profile, low warpage 2.5D and 3D solutions. The use of these embedded eWLB packages in a side-by-side configuration to replace a stacked package configuration is critical to enable a more cost effective mobile market capability. Combining the analog or memory device with digital logic device in a semiconductor package can provide an optimum solution for achieving the best performance in thin, multiple-die integration aimed at very high performance. This paper highlights the rapidly moving trend towards eWLB packaging technologies with ultra fine 2/2μm line width and line spacing and multi-layer RDL. A package design study, process development and optimization, and mechanical characterization will be discussed as well as test vehicle preparation. JEDEC component level reliability test results will also be presented.

Benefits and Challenges for BPM in the Cloud

2019 ◽  
pp. 1844-1868
Author(s):  
Ute Riemann
Keyword(s):  
Cloud Computing ◽  
Business Process ◽  
Information Exchange ◽  
Process Management ◽  
Business Models ◽  
Business Processes ◽  
Process Development ◽  
Cost Effective ◽  
Cloud Service ◽  
Cloud Infrastructure

Business processes are not only variable, they are dynamic as well. A key benefit of BPM is the ability to adjust processes accordingly in response to changing market requirements. In parallel to BPM, enterprise cloud computing technology has emerged to provide a more cost effective solution to businesses and services while making use of inexpensive computing solutions, which combines pervasive, internet, and virtualization technologies (). Despite the slow start the business benefits of cloud computing are as such that the transition of BPM to the cloud is now underway. Cloud services refer to the operation of a virtualized, automated, and service-oriented IT landscape that allows the flexible provision and usage-based invoicing of resources, services, and applications via a network or the Internet. The generic term “X-as-a-Service” summarized the business models delivering almost everything as a service. BPM in the cloud is often regarded as a SaaS application. More recently, BPM is being regarded as a PaaS as it facilitates the creation and deployment of applications, in this case business process solutions. The PaaS landscape is the least developed of the four cloud based software delivery models previously discussed. PaaS vendors, such as IBM, Oracle, Microsoft delivered an application platform with managed cloud infrastructure services however more recently the PaaS market has begun to evolve to include other middleware capabilities including process management. BPM PaaS is the delivery of BPM technology as a service via a cloud service provider. In order to be classified as a PaaS a BPM suite requires the following capabilities: the architecture should be multi-tenant, it should be hosted off premise and it should offer elasticity and metering by use capabilities. When we refer to BPM in the cloud what we are really referring to is a combination of BPM PaaS and BPaaS (Business Process as a Service). Business Process as a Service (BPaaS) is a set of pre-defined business processes that allows the execution of customized business processes in the cloud. BPaaS is a complete pre-integrated BPM platform hosted in the cloud and delivered as a service, for the development and execution of general-purpose business process application. Although such a service harbors an economic potential, questions that need to be answered are as follows: Can an individual and company-specific business process supported by a standardized cloud solution, or should we protect process creativity and competitive differentiation by allowing the company to design the processes individually and solely support basic data flows and structures? Does it make sense to take a software solution “out of the box” that handles both data and process in a cloud environment, or would this hinder the creativity of business (process) development leading to a lower quality of processes and consequently to a decrease in the competitive positioning of a company? How to manage the inherent compliance and security topic. Within a completely integrated business application system, all required security aspects can be implemented as safeguards with just enough money. Within the cloud, however, advanced standards and identity prove is required to monitor and measure information exchange across the federation. Thereby there seems to be no need for developing new protocols, but a standardized way to collect and evaluate the collected information.

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