Full-Scale Site Investigations on Soil-Plugging Inside Tubular Piles

2012 ◽  
Author(s):  
Sascha Henke
Keyword(s):  
Soil Column ◽  
Present Contribution ◽  
Factors Affecting ◽  
Pile Installation ◽  
Site Investigations ◽  
Pile Diameter ◽  
External Stresses ◽  
Vertical Bearing ◽  
The One ◽  
Analytical Approaches

Soil-plugging inside open-ended piles is a well-known phenomenon which increases vertical bearing capacity on the one hand but also leads to increasing driving resistance. There are many different factors affecting the tendency of soil-plug formation like pile diameter, geometry of the pile, installation method, soil density and so on. In the present contribution, in-situ measurements regarding two tubular piles with a diameter of 71 cm are presented. The piles are first vibratory driven up to 6.5 m penetration and afterwards they are impact driven to their final penetration depth. During the installation internal and external stresses at the pile toe and accelerations and strains at the pile head are measured on both piles. Furthermore, one pile is equipped with a cone penetrometer inside the pile to monitor cone and shaft resistance during the installation. At the end of the installation the height of the internal soil column is measured. The results are discussed with focus on the installation method on soil plugging tendency. Concluding they are compared to classical analytical approaches.

Large Deformation Numerical Simulations Regarding Soil Plugging Behaviour Inside Open-Ended Piles

2012 ◽  
Author(s):  
Sascha Henke
Keyword(s):  
Numerical Models ◽  
Soil Plug ◽  
Factors Affecting ◽  
Pile Installation ◽  
Pile Diameter ◽  
Key Factor ◽  
Vertical Bearing ◽  
The One ◽  
Plug Formation ◽  
The Impact

Soil-plugging inside open-ended piles is a well-known phenomenon which increases vertical bearing capacity on the one hand but also leads to increasing driving resistance. There are many different factors affecting the tendency of soil-plug formation like pile diameter, geometry of the pile, installation method, soil density and so on. With the basis of experimental data numerical models to simulate the pile installation process to better understand the mechanisms of soil plugging inside open-ended piles are validated. The validated numerical models are used to examine different aspects regarding the phenomenon of soil plug formation. First, the evolution of internal and external shaft friction is investigated in more detail with focus on pile diameter. Furthermore, the impact of internal reinforcements like internal rings are investigated numerically. The shape of the internal ring is varied throughout this study to evaluate the influence of this key factor on internal stress development.

Effect of leakage and blockage on the acoustic behavior of particle filters

2019 ◽  
Vol 67 (6) ◽  
pp. 483-492
Author(s):  
Seonghyeon Baek ◽  
Iljae Lee
Keyword(s):  
Transfer Matrix ◽  
Particle Filters ◽  
Acoustic Analysis ◽  
Transmission Loss ◽  
One Dimensional ◽  
Filter System ◽  
The Difference ◽  
The One ◽  
Analytical Approaches ◽  
Good Agreement

The effects of leakage and blockage on the acoustic performance of particle filters have been examined by using one-dimensional acoustic analysis and experimental methods. First, the transfer matrix of a filter system connected to inlet and outlet pipes with conical sections is measured using a two-load method. Then, the transfer matrix of a particle filter only is extracted from the experiments by applying inverse matrices of the conical sections. In the analytical approaches, the one-dimensional acoustic model for the leakage between the filter and the housing is developed. The predicted transmission loss shows a good agreement with the experimental results. Compared to the baseline, the leakage between the filter and housing increases transmission loss at a certain frequency and its harmonics. In addition, the transmission loss for the system with a partially blocked filter is measured. The blockage of the filter also increases the transmission loss at higher frequencies. For the simplicity of experiments to identify the leakage and blockage, the reflection coefficients at the inlet of the filter system have been measured using two different downstream conditions: open pipe and highly absorptive terminations. The experiments show that with highly absorptive terminations, it is easier to see the difference between the baseline and the defects.

Unfilled Training Positions in Germany – Regional and Establishment-Specific Determinants

2019 ◽  
Vol 239 (4) ◽  
pp. 661-701 ◽  
Author(s):  
Sandra Dummert ◽  
Ute Leber ◽  
Barbara Schwengler
Keyword(s):  
Related Factors ◽  
Factors Affecting ◽  
External Conditions ◽  
Western Germany ◽  
Enterprise Level ◽  
Specific Factors ◽  
Regional Factors ◽  
The One ◽  
Training Position ◽  
Quantitative Importance

AbstractThe current situation in the German apprenticeship market is characterized by two contradictory developments. On the one hand, establishments are experiencing increasing problems filling the training positions they offer, and the number of vacant training positions is climbing. On the other hand, the transition into training is still difficult for many young people, and the number of unsuccessful vocational training applicants is rising. Hence, matching supply with demand is becoming increasingly difficult in the German job market for training positions. Using the Linked Employer-Employee dataset (LIAB) from the Institute for Employment Research (IAB), our paper provides a closer examination of the phenomenon of unfilled training positions. It presents an overview of the evolution of vacant training positions in eastern and western Germany and attempts to explain the number of vacancies by investigating the factors responsible for the establishments’ inability to fill their training positions. We assume that training position vacancies are due not only to internal company reasons such as firm size or the wage offer for apprentices but also to external conditions such as general regional factors. Therefore, our analysis also considers the situation on the demand side of the labor market within a region. The results of our multilevel mixed-effects estimations show that in addition to characteristics on the enterprise level, regional determinants also affect the share of vacant apprenticeships. With respect to establishment-related factors, mainly characteristics that describe the attractiveness of the firm prove to be important. With regard to regional-specific factors, we find that the availability of school leavers in a region in addition to the level of regional-sectoral competition impacts the recruiting success of establishments. Our analysis also shows that there are remarkable differences between eastern and western Germany concerning both the quantitative importance of unfilled training positions and the factors affecting them.

scholarly journals Preliminary synthesis of algorithms for automatic control of automobile continuously variable transmissions with flexible links

2020 ◽  
Vol 1 (4) ◽  
pp. 25-37
Author(s):  
A.E. Yesakov ◽  
◽  
A.V. Kretov ◽  
P.A. Krasavin ◽  
◽  
...  
Keyword(s):  
Automatic Control ◽  
Direct Consequence ◽  
Continuously Variable Transmission ◽  
Factors Affecting ◽  
Flexible Links ◽  
Automatic Control Systems ◽  
High Durability ◽  
Continuously Variable Transmissions ◽  
Variable Transmission ◽  
The One

Variators of different operating principles and designs are of interest as components of automatic transmissions for ground transport and traction machines. At the same time, one of the most popular types of variators are the variators built on the basis of continuously variable transmissions with flexible links. The main reasons for the use of such variators in the transmissions of a number of modern passenger vehicles are, on the one hand, the emergence of flexible link designs with high durability, and, on the other hand, the widespread introduction of programmable electronic devices into automatic control systems for continuously variable transmissions. A direct consequence of the latter circumstance was the need for in-depth research aimed at synthesizing such control algorithms that would make it possible to fully use the advantages inherent in continuously variable transmissions with flexible links and minimize the operational consequences of their shortcomings. This paper makes an attempt to solve the problem of synthesizing the algorithm in a preliminary form, based on the goal of providing the vehicle with the best traction and speed properties. The presence of such an attempt will allow, having set the main parameters of a continuously variable transmission for some reason, to develop the hardware of the automatic control system. In turn, this will make it possible to synthesize a refined algorithm that takes into account the dynamics of the system, errors of meters and signal conversion devices, as well as other factors affecting work pro-cesses. When considering the described problem, various variants of the geometry of the contact surfaces of the continuously variable transmission links were taken into account and the corre-sponding mathematical apparatus were formed. The results of calculations, obtained by computer program that implements these devices, are selectively presented in the materials of the paper.

scholarly journals KINERJA LEMBAGA PERWAKILAN RAKYAT DAERAH (Studi Deskriptif Kualitatif Di DPRD Kota Bengkulu)

2015 ◽  
Vol 1 (2) ◽  
Author(s):  
Harius Eko saputra
Keyword(s):  
Mass Media ◽  
Public Service ◽  
Public Services ◽  
Research Seminar ◽  
Factors Affecting ◽  
The Public ◽  
Current Implementation ◽  
The One ◽  
The Right

Almost every day, in various mass media, especially in newspapers, it is found that there are so many complaints and unsatisfactory opinions from the community, as the customer, towards the current implementation of public service. These complaints and unsatisfactory opinions can describe how bad the quality of the current public service is, which is benefited by the community. It may be the right time for the community to be treated as citizens, who will have rights and give priority to their rights for being served afterwards. They are not anymore being considered as clients who previously have no any choice in choosing and in determining what kind of service that they really want to. There are so many results from research, seminar and writings that are conducted by experts in which their works talk about the implementation of a good and qualified public service. Currently, however, the qualified public service has not yet implemented as should have been. The implementation of public service still acts as however it please to be and only emphasize on its own interest without considering the consumer’s importance as the party that should really be served as well as possible. For this reason, a research, which is done in Service Integrated Unit of the Jember Regency, tries to find out any factors affecting quality of the public services. The main core of the public service implementation is the quality of norm of the service executor. The matter that should be realized is that the executor is the person who should serve for the community, and the community is the one who should be served as well as possible.Keywords: Implementation of public service, legislatif

scholarly journals Analysis of Effect of Bulbous Bow Shape to Ship Resistance in Catamaran Boat

2018 ◽  
Vol 159 ◽  
pp. 02058
Author(s):  
Deddy Chrismianto ◽  
Kiryanto ◽  
Berlian Arswendo Adietya
Keyword(s):  
Fluid Dynamic ◽  
The Body ◽  
Wave System ◽  
Total Resistance ◽  
Factors Affecting ◽  
Ship Resistance ◽  
Bow Wave ◽  
Main Factors ◽  
The One ◽  
Bulbous Bow

Ship resistance is one of the main factors affecting the design of a ship. Catamaran boat is a ship with small wet surface area that able to reduce drag and improve ship power. Generally, a bulbous bow is implemented to reduce wave resistance because the bulbous shape is believed to attenuate the bow wave system. Additionally, the bulbous bow also tends to reduce viscous resistance. When the flow around the body is smooth, the total ship resistance can be reduced significantly if the optimum bulbous bow is obtained. In this study, the main purpose is to get the bulbous bow shape in catamaran boat which produces the smallest ship resistance by using computational fluid dynamic (CFD). Generating the variation of the bulbous bow shapes apply the one-to-one correspondence of the cross section parameter (ABT) and lateral parameter (ABL). The result of investigation shows that application of bulbous bow on catamaran boat can reduce about 11-13% of total resistance of ship.

Il radicamento di una comunitŕ di Xoraxanč Romŕ a Roma

2009 ◽  
pp. 67-84
Author(s):  
Marco Solimene
Keyword(s):  
Social Networks ◽  
Social Network ◽  
The Other ◽  
Present Contribution ◽  
Other Hand ◽  
The One ◽  
The City

- The present contribution examines the rootedness of a community of xoraxané romá in the city of Rome; rather than simply the continuity of presence in a specific territory, under consideration is the development and maintenance of social networks with the Roman population, specifically in the territories romá reside and/or work in. Further on, the paper describes how rootedness may be conjugated with some forms of mobility: on the one hand, the continuity in specific areas (of work and in some cases of residence), can be maintained through practices of urban circulation; on the other hand, especially when mobility turns on national and transnational scale, the presence - although mobile and changing - of romá who belong to the same social network, spread among different territories, enables singular domestic units to maintain, despite mobility, a continuity with several non-rom realities.

scholarly journals Pork: profile of the West of Paraná consumers and physical evaluation of chop

2017 ◽  
Vol 38 (6) ◽  
pp. 3563
Author(s):  
Rosana Aparecida da Silva-Buzanello ◽  
Daneysa Lahis Kalschne ◽  
Silmara Maisa Heinen ◽  
Claudete Pertum ◽  
Alexia Francielli Schuch ◽  
...  
Keyword(s):  
Meat Quality ◽  
Storage Conditions ◽  
Absorption Capacity ◽  
Physical Parameters ◽  
Exploratory Research ◽  
Factors Affecting ◽  
Pig Farming ◽  
Consumption Index ◽  
The One ◽  
Processing And Storage

Pork consumption in Brazil is still low despite its productive importance. Relevant issues such as swine breeding, meat quality, and evaluation of aspects and attributes considered important by pork consumers at the time of purchase allows identifying consumer market demands. Moreover, physical parameters evaluation or pork cuts are suggested to certify the meat quality. The aim of this study was to identify the current situation of pig farming and determine the main aspects considered by consumers when buying pork in the Western region of Paraná state, Brazil. Furthermore, the physical properties of five pork chop brands marketed in the region were determined. Initially, an exploratory research was conducted involving ten pig farming sector professionals. This research allowed identifying that professionals understand the factors affecting meat quality and that some municipalities in the region are beyond their absorption capacity for pig production market. A descriptive research involving one hundred pork consumers showed that, although most prefer beef, 41% reported to consume pork 2 to 3 times a week. Pork chops and ribs are the preferred cuts, either fried or roasted. Details such as expiration date and federal inspection register were considered the most important aspects at the time of purchase, while price was the least important one. The meat color was the most mentioned sensory attribute. The physical analyses of five pork chop brands showed no pH difference (p > 0.05), water holding capacity, and cooking loss results, distinctive from the one observed for color (L*, a* and b*) and shearing force, which showed differences among the brands (p ? 0.05). Comparing pH and L*, it can be suggested that two brands showed normal meat characteristics, one DFD meat (pH > 6.0 and L* < 45), and other two brands PSE (pH < 5.8 and L* > 50). The research contributed to identifying features considered important by pork consumers, suggesting strategic actions to achieve greater preference and consumption index. The evaluation of physical parameters showed there is variability involved in pork chop quality as the samples were obtained from commercially different origins and under different processing and storage conditions.

Treasures and wondrous objects in Gothic Toledo and Muslim Medieval culture

2018 ◽  
Vol 71 (2) ◽  
pp. 142-160
Author(s):  
Jaime Gómez de Caso Zuriaga
Keyword(s):  
The Other ◽  
General Sense ◽  
Present Contribution ◽  
The Past ◽  
Modern Reader ◽  
Other Hand ◽  
The One ◽  
The Relationship ◽  
Muslim Culture ◽  
Insight Into

Abstract The aim of the present contribution is twofold. On the one hand we shall discuss the background of some Islamic legends about places and wondrous objects – holy relics of the past – that had once been in the possession of the Gothic monarchy by inheritance, but were subsequently lost or looted out of al-Andalus by the Muslim leaders. On the other hand our study is concerned with the relationship between the content of the legends in question and the “loss of Spain” in a more general sense, i.e. not only the loss of these objects by the Christian Goths subsequent to their loss of power in Spain, but also their disappearance from Muslim ownership. Besides, the legends possess a moral core, which is interesting in its own right: the way in which they are viewed in the Muslim sources, the locations and objects they describe, and their relationship to the Gothic monarchy may provide the modern reader with an insight into the striking vision of the past held by the invading Muslim culture.

Factors affecting L2 phonological awareness in Chinese-Dutch preschoolers

2020 ◽  
Vol 23 (1) ◽  
pp. 109-128
Author(s):  
Han Yuan ◽  
Eliane Segers ◽  
Ludo Verhoeven
Keyword(s):  
Phonological Awareness ◽  
First Language ◽  
Receptive Vocabulary ◽  
Bilingual Children ◽  
Factors Affecting ◽  
Initial Phoneme ◽  
Rhyme Awareness ◽  
Bilingual Group ◽  
The One ◽  
The Relationship

Abstract The present study compared the relationship between Dutch phonological awareness (rhyme awareness, initial phoneme isolation), Dutch speech decoding and Dutch receptive vocabulary in two groups in different linguistic environments: 30 Mandarin Chinese-Dutch bilingual children and 24 monolingual Dutch peers. Chinese vocabulary and phonological awareness were taken into account in the bilingual group. Bilingual children scored below their Dutch monolingual counterparts on all Dutch tasks. In the bilingual group, Dutch rhyme awareness was predicted by Dutch speech decoding, both directly, and indirectly via Dutch receptive vocabulary. When adding Chinese proficiency to the model, Chinese rhyme awareness was found to mediate the relationship between Dutch speech decoding and Dutch rhyme awareness. It can thus be concluded that second language (L2) phonological awareness in Chinese-Dutch kindergartners is affected by their L2 speech and vocabulary level, on the one hand, and their level of phonological awareness in the first language (L1).

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