PERFORMANCE RELATED RESEARCH ON THE IN-SITU CONCRETE BUILDING

1997 ◽  
pp. 235-250
Author(s):  
P.S. CHANA ◽  
S. ARORA ◽  
R.M. MOSS
Keyword(s):  
Related Research ◽  
Concrete Building

In situ seismic testing of a reinforced autoclaved aerated concrete building

ce/papers ◽  
2018 ◽  
Vol 2 (4) ◽  
pp. 253-258
Author(s):  
Furkan Gokmen ◽  
Baris Binici ◽  
Erdem Canbay ◽  
Alper Aldemir ◽  
Mustafa Kagan Ogdu ◽  
...  
Keyword(s):  
Seismic Testing ◽  
Autoclaved Aerated Concrete ◽  
Concrete Building ◽  
Aerated Concrete

scholarly journals Chromatin Quality as a Crucial Factor for the Success of Fluorescent in Situ Hybridization Analyses of Unfertilized Oocytes, Polar Bodies and Arrested Zygotes

2010 ◽  
Vol 13 (1) ◽  
pp. 1-8
Author(s):  
R Zhivkova ◽  
S Delimitreva ◽  
D Toncheva ◽  
I Vatev
Keyword(s):  
Fluorescent In Situ Hybridization ◽  
Sperm Chromatin ◽  
Fish Analysis ◽  
Premature Chromosome Condensation ◽  
Related Research ◽  
The Third ◽  
Polar Bodies ◽  
Cell Fixation

Chromatin Quality as a Crucial Factor for the Success of Fluorescent in Situ Hybridization Analyses of Unfertilized Oocytes, Polar Bodies and Arrested ZygotesMaterial that is supernumerary or unsuitable for in vitro fertilization (IVF) procedures is used for basic and for IVF-related research. Despite the disadvantages of such cells, they have contributed much to our understanding of the mechanisms and prevalence of different abnormalities.Fifty-four human unfertilized oocytes, 34 arrested bipronuclear zygotes and 15 polar bodies were fixed for analysis on the third day after in vitro insemination and were subjected to fluorescent in situ hybridization (FISH) with probes for chromosomes 18, 21, X and Y (centromere for 18, X, Y and locus-specific for 21). The aim of the study was the comparison of FISH efficiency in differently condensed chromatin.The success of FISH analysis was over 60% of analyzed cells and it was dependent on the chromatin changes (condensation and/or fragmentation) during the culture period before cell fixation. Chromatin ageing was the crucial factor for the reduced success of FISH in both oocyte chromosomes (60.0%) and pronuclei (61.76%). The chromatin of second polar bodies (PBII), and premature chromosome condensation (PCC) of the sperm chromatin in oocytes was more suitable for FISH analysis (FISH success 75.0% in PBII and 64.29% in PCC) with both centromere and locus-specific probes.These results revealed the significance of early signs of in vitro cell ageing for the success of FISH analysis and for the interpretation of results in case of analysis of unfertilized human ova, polar bodies and arrested zygotes.

scholarly journals Parafia rzymskokatolicka w świadomości młodzieży polskiej przełomu wieków. Badania socjologiczne z lat 1988–2018

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Józef Baniak
Keyword(s):  
High School ◽  
21St Century ◽  
Roman Catholic ◽  
Time Frame ◽  
Religious Community ◽  
General Question ◽  
Related Research ◽  
In Situ Data ◽  
Research Outcome

In this paper I present a widely understood attitude of gymnasium, high school and academic youth in Poland in the two last decades of the 20th century and both first decades of the 21st century towards the Roman-catholic parish as a church institition and a socio-religious community of secular Catholics. The basis for the presented issues is being made by the research outcome of various sociologists of religion undertaken in the mentioned time frame. The main issue is being made here by the general question – how did shape in this time frame the attitude of the youth towards the Roman-catholic parish? The goal of this paper is to present the declaration of the youth related to the attitude towards the home parish. The presented investigations use the method of the analysis of in situ data and a comparison of various related research.

scholarly journals Experimental assessment of the ultimate performance and lateral drift behaviour of precast concrete building cores

2020 ◽  
Vol 23 (12) ◽  
pp. 2597-2613 ◽  
Author(s):  
Scott J Menegon ◽  
John L Wilson ◽  
Nelson TK Lam ◽  
Emad F Gad
Keyword(s):  
Cross Section ◽  
Large Scale ◽  
Experimental Testing ◽  
Precast Concrete ◽  
Composite Action ◽  
Lateral Drift ◽  
The Core ◽  
Concrete Building ◽  
Plate Connections

Precast concrete building cores are a widely used lateral load resisting system in low and mid-rise multi-storey buildings. However, despite their widespread use in countries like Australia or New Zealand, a very little research or experimental testing has been undertaken to assess their lateral drift behaviour. This article will present the findings and observations of a recent experimental testing programme into reinforced concrete precast building cores, which included three large-scale ‘box-shaped’ precast building core specimens. Adjacent panels in each specimen were connected together using welded stitch plate connections and then connected to foundation blocks on the top and bottom using grout tube connections. The results of the testing showed that the welded stitch plate connections were too flexible to allow full composite action to be developed in the cross-section, which meant the precast building core specimens were around 25% more flexible than an equivalent cast in-situ version. The testing also highlighted common detailing and construction deficiencies that can severely inhibit the ductility of the core.

Monitoring of concrete building construction

2007 ◽  
Vol 34 (10) ◽  
pp. 1334-1351
Author(s):  
Shyh-Chyang Lin
Keyword(s):  
Environmental Changes ◽  
Human Life ◽  
Construction Materials ◽  
Concrete Construction ◽  
Factors Affecting ◽  
Concrete Members ◽  
Concrete Building ◽  
Property Loss ◽  
Study Offer

The collapses of concrete structures cause property loss, construction delays, and, more importantly, loss of human life. It is unlikely that a concrete construction failure is caused by a single factor. Presumably, a major cause combined with several secondary factors, such as rainfall, temperature fluctuations, uploading of formworks and rebars, and concrete placing, will have catastrophic consequences. This research tries to clarify the causes that increase the deformation of and stresses upon concrete members during construction stages. The marked strain increases, identified by daily readings of embedded gages, are due to either environmental changes or construction factors. The measured data shows that without unexpected external loadings, large rainfall causes a remarkable increase in the strain and stress on a concrete structure during construction. Other secondary factors affecting the concrete are: uploading of construction materials, removal of the support structure and formworks, change of temperature, and concrete placing. The results obtained by this study offer some precautions for in situ concrete construction.Key words: monitoring, strain gage, concrete construction, collapse.

scholarly journals In situ seismic testing of a reinforced autoclaved aerated concrete building

Mauerwerk ◽  
2018 ◽  
Vol 22 (5) ◽  
pp. 305-313
Author(s):  
Baris Binici ◽  
Furkan Gokmen ◽  
Erdem Canbay ◽  
Alper Aldemir ◽  
Mustafa Kagan Ogdu ◽  
...  
Keyword(s):  
Seismic Testing ◽  
Autoclaved Aerated Concrete ◽  
Concrete Building ◽  
Aerated Concrete

scholarly journals Seismic Performance of Precast Columns Connected with Two Different Connection Modes

2021 ◽  
Vol 30 (3) ◽  
Author(s):  
Chuanlin Wang
Keyword(s):  
Seismic Performance ◽  
Low Frequency ◽  
Experimental Tests ◽  
Repeated Loading ◽  
Longitudinal Reinforcement ◽  
Concrete Building ◽  
The Stability ◽  
Steel Sleeve ◽  
Unbonded Length

The precast reinforced concrete building is made of precast components, which are connected at the joints via reliable connection approaches. Therefore, the study on the stability and reliability of the connections should be conducted to improve the safety and integrity of the precast structure. In this paper, experiments on two connection modes, i.e. corrugated pipe confined with spiral stirrup connection and steel sleeve connection, were carried out. The experimental tests consisted of six specimens, including one cast-in-situ specimen, three precast specimens using steel sleeve connection and two precast specimens using corrugated pipe confined with the spiral stirrup. The influence of artificially unbonded length at the connection joint is also studied. All specimens were tested under low-frequency cyclic repeated loading to analyse their seismic performance under different connection modes. The experimental results showed that the precast columns using the two proposed connections have a similar or even better seismic performance compared with the cast-in-situ column. The installation of proper unbonded treatment on the longitudinal reinforcement in the connection is beneficial in improving the seismic performance of precast columns and the length of 5 times of the longitudinal reinforcement’s diameter is recommended.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

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