The Impact of Having a Baby on the Level and Content of Women’s Well-Being

The primary objective of this study was to more fully understand the impact of having a baby on women’s well-being by attending to both the level and the content of well-being. To cover the judgemental and affective aspects of well-being we included global measures of life satisfaction and well-being and affective experience measures derived from the day reconstruction method. In a sample of 19 first-time mothers no differences between pre and postnatal reports of general life satisfaction, depression, anxiety, and experienced positive and negative affect were found, suggesting that the arrival of the newborn baby does not universally impact on women’s level of well-being. Changes in the content of well-being were studied by examining changes in the way women experience specific activities and interactions with various social partners. There appeared to be an upward shift in experienced positive affect during active leisure and a slight decrease in negative affect during time spent with relatives. The results are discussed in light of previously documented changes across the transition to motherhood in negative mood states, time use, women’s evaluation of various aspects of daily life, and relational satisfaction

Outcomes from elective colorectal cancer surgery during the SARS-CoV-2 pandemic

This study aimed to describe the change in surgical practice and the impact of SARS-CoV-2 on mortality after surgical resection of colorectal cancer during the initial phases of the SARS-CoV-2 pandemic

Indirect estimation of cohesion in weak rocks [Zayi{dotless}f kayaçlarda kohezyonun dolayli{dotless} olarak tahmini]

Boren;DEMiR Export;et al;metso Expect results;Outotec;TMMOB Maden Muhendisleri Odasi23rd International Mining Congress and Exhibition of Turkey, IMCET 2013 -- 16 April 2013 through 19 April 2013 -- Antalya -- 105453Estimation of the geomechanical properties of weak rocks cannot usually be realized reliably due to the difficulties encountered in obtaining the core samples with proper dimensions and those encountered during the tests (i.e. disorder in the failure surfaces occurred, selection of the confining pressure in triaxial tests and crushing in core samples during the test). This situation is seen in uniaxial compression, triaxial compression and deformability tests in particular. In this study, several rock mechanics tests have been performed on thirteen different rock types (i.e. claystone, siltstone, travertine, sandstone, andesite, conglomerate, tuff etc.) in order to indirect estimate the cohesion of weak rocks (?c<50MPa). In selection of the tests, special attention has been paid to ease of preparation of rock samples and selecting tests that are practically performable (i.e. indirect tensile strength test, P-wave velocity etc.). Besides, simple and multiple regression analysis have been conducted considering the weathering degree of the rocks used. The convenience of developed models has been verified by ?2 suitability test and it has been seen that the models are eligible. It was concluded that the cohesion of weak rocks could be estimated with sufficient reliability by the proposed empirical formulas

New testing methodology for the quantification of rock crushability: Compressive crushing value (CCV)

Crushing is a size reduction process that plays a key role in both mineral processing and crushing–screening plant design. Investigations on rock crushability have become an important issue in mining operations and the manufacture of industrial crusher equipment. The main objective of this research is to quantify the crushability of hard rocks based on their mineralogical and mechanical properties. For this purpose, the mineralogical, physical, and mechanical properties of various hard rocks were determined. A new compressive crushing value (CCV) testing methodology was proposed. The results obtained from CCV tests were compared with those from mineralogical inspections, rock strength as well as mechanical aggregate tests. Strong correlations were found between CCV and several rock and aggregate properties such as uniaxial compressive strength (UCS), the brittleness index (S20), and aggregate impact value (AIV). Furthermore, the relationship between the mineralogical properties of the rocks and their CCVs were established. It is concluded that the proposed testing methodology is simple and highly repeatable and could be utilized as a pre-design tool in the design stage of the crushing process for rock quarries. © 2018, University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature.Bülent Ecevit Üniversitesi: 2016-98150330-01This work was financially supported by Zonguldak Bülent Ecevit University (No. 2016-98150330-01)

An experimental investigation on the durability of railway ballast material by magnesium sulfate soundness

In this study, the durability of railway ballast material is investigated by magnesium sulfate soundness tests. Two types of ballast aggregates, which are produced from basaltic rocks and currently used as railway ballast in such high speed railway routes in Turkey, are investigated regarding their resistance against freezing–thawing (FT) and traffic loads. Firstly, the mineralogical and physico-mechanical properties of rocks are determined. Then the degradation of investigated ballast aggregates is determined by magnesium sulfate soundness and Los Angeles abrasion (LAA) tests. The natural FT effects are simulated by magnesium sulfate soundness tests up to 40 cycles, whereas the traffic loads are represented by LAA tests up to 3000 revolutions. The ballast fouling that leads to such problems are also investigated within the scope in the present study. The degree of ballast fouling is quantified as fouling index (FI) which is determined using the crushed particles generated after LAA tests. It is concluded from laboratory studies that rock properties considered are considerably influenced by simulated FT cycles. It is also achieved from the laboratory studies that magnesium sulfate soundness and Los Angeles abrasion tests are good indicators to clarify the fragmentation mechanism of the ballast aggregate in laboratory scale. In conclusion several empirical formulas are developed to predict LAA and FI for each rock type. The proposed empirical formulas could be utilized as a pre-design tool for new railway routes in design stage provided that the investigated ballast aggregates are considered. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.Bülent Ecevit ÜniversitesiAcknowledgements The authors gratefully acknowledge and appreciate the constructive comments and suggestions of the reviewers and the financial support (Project No: 2016-98150330-01) provided by Bülent Ecevit University

Weathering effects on physical properties and material behaviour of granodiorite rocks

ISRM International Symposium - EUROCK 2016 -- 29 August 2016 through 31 August 2016 -- -- 144475Weathering has several effects on the physical, strength and material behaviour characteristics of rocks. Various researchers have attempted to obtain weathering classifications using qualitative and/or quantitative approaches. In this study, material behaviour under uniaxial loading conditions, mechanical and physical properties are investigated for reliable estimation of weathering degree of granodiorites. For this purpose, representative rock samples with different degrees of weathering from Havran (Balıkesir/Turkey) were collected and the necessary investigations and tests were performed. Weathering grades ranging from unweathered (W 0 ) to highly weathered rock (W 3 ) were used for classification purposes. Core samples were tested in the laboratory to determine various physical and mechanical properties for each weathering class. Also, mineralogical properties of granodiorites were investigated and described for each weathering degree. Test results were used for analyzing and constructing prediction models with the aim of indirect determination of the weathering degree of granodiorites. Finally, a monogram was proposed to distinguish different weathering degrees under uniaxial loading conditions for rock engineering purposes. © 2016 Taylor & Francis Group, Londo

Drillability assessment of rocks based on strength and brittleness

31st Annual International Pittsburgh Coal Conference: Coal - Energy, Environment and Sustainable Development, PCC 2014 -- 6 October 2014 through 9 October 2014 -- -- 110055[No abstract available

Stability analysis of deep coal mine main roadways for pumped hydropower lower reservoir storage

ISRM International Symposium - EUROCK 2013 -- 23 October 2013 through 26 October 2013 -- -- 138846A grid compatible integration of fluctuating renewable energy from high capacity wind and solar energy farms to electricity systems requires large-scale energy storage methods and technologies. Currently widespread large-scale electricity storage installed is reservoir-based hydropower and Pumped Hydropower Energy Storage (PHES). Large storage volumes are necessary to deal with the relatively low volumetric storage density property of PHES plants. Investigations are made to benefit from the large volumetric storage potential of deep coal mine openings. Especially, main roadways of active and some closed hard coal mines are available and may be used as large lower reservoir volumetric storage openings for PHES plants. This paper address some basic rock engineering and stability issues associated with PHES projects in deep hard coal mines. Evaluations are made for safe and effective usage of the underground coal mine openings as PHES lower reservoir storage volumes. © 2013 Taylor & Francis Group, London

An experimental investigation on rock crushability using jaw and cone crushers

26th International Mining Congress and Exhibition of Turkey, IMCET 2019 -- 16 April 2019 through 19 April 2019 -- -- 151960This study covers the investigation of rock crushability using laboratory-scale cone and jaw crushers for five types of hardrocks. For this purpose, physico?mechanical properties of the investigated rocks are determined. Aggregate samples with a particle size range of 10.00 - 14.00 mm are prepared for crushability tests. After performing crushability tests, crushed particles are sieved and considering sieve analysis results, crushability indices are identified for each rock and crusher type. The performance of the crushers concerning their experimental setup is investigated by Taggart method. It is achieved from crushability tests that, the performance of the cone crusher is approximately two times better than the one of the jaw crusher for their experimental setups. The crushing time (Tc) seems to increase with increasing in rock strength properties. Furthermore, remarkable relationships are obtained between several rock properties and crushability test results. It can be claimed that crushability of rocks are dependent upon crusher type, setup of crushing process, rock strength as well as the mineral hardness. Considering these types of variables, higher achieving benefits of aggregate production could be satisfied at lower costs. Copyright © IMCET 2019 International Mining Congress and Exhibition of Turkey. All rights reserved