Metal matrix composites (MMC) have become a large leading material in composite materials and particle reinforced aluminium MMCs have received considerable attention due to their excellent ...engineering properties. These materials are known as the difficult-to-machine materials, because of the hardness and abrasive nature of reinforcement element like silicon carbide (SiC) particles. In this study, homogenised 5% SiC-p aluminium MMC material was selected for experimental investigation of tool wear and surface roughness. Two types of K10 cutting tool (uncoated and TiN-coated) were used at different cutting speeds (50, 100 and 150
m/min), feed rates (0.1, 0.2 and 0.3
mm/rev) and depths of cut (0.5, 1 and 1.5
mm). In dry turning condition, tool wear was mainly affected by cutting speed, increased with increasing cutting speed. Tool wear was lower when coated cutting tool was used in comparison to uncoated one. Surface roughness influenced with cutting speed and feed rate. Higher cutting speeds and lower feed rates produced better surface quality.
•At 100% RCA content, the concrete strength decreases about 24%.•Tensile splitting strength/compressive strength of RCA concretes are 7.7–11.4%.•Inverse relation between density–water absorption at ...higher RCA content observed.
Nowadays, researches on the usability of recycled aggregate (RA) in concrete is gaining popularity in all over the World due to the preservation of the environment and sustainable development. RA can be obtained after crushing and screening of the construction rubble obtained from demolished structures. The recycled coarse aggregate (RCA) used in this work is obtained from İSTAÇ (The İstanbul Environmental Protection and Waste Processing Corporation) to replace the natural coarse aggregates (NCA) in different proportions. Mineral additives used in this experimental work are silica fume (SF) and ground granulated blast furnace slag (GGBFS) at various ratios. The influence of SF and GGBFS with RCA of hardened concrete, such as compressive strength, tensile splitting strength, density and water absorption of are experimentally investigated. The test results obtained showed that at 100% of the replacement level of RCA, the compressive strength decreases about 24% and the strength reduction is more significant at over 50% RCA content. Increasing the RCA content significantly improves the tensile splitting strength of the concrete according to the compressive strength. The ratios between the tensile splitting strength to the compressive strength are greater in the RCA concretes incorporating GGBFS than the RCA concretes incorporating SF. An inverse relationship between the density and the water absorption ratio is observed in RCA concretes and this relation is more significant in higher amounts of RCA contents.
We study the flavor changing neutral current couplings of new heavy quarks through the Z ′ models at the LHC. We calculate the cross sections for the signal and the corresponding standard model ...background processes. Considering the present limits on the mass of new heavy quarks and the Z ′ boson, we performed an analysis to investigate the parameter space (mixing and mass) through different Z ′ models. For FCNC mixing parameter x = 0.1 and the Z ′ mass M Z ′ = 2000 GeV and new heavy quark mass m t ′ = 700 GeV at the LHC with s = 13 TeV, we find the cross section for single production of new heavy quarks associated with top quarks as 5.8 fb, 3.3 fb, 1.5 fb, and 1.2 fb within the Z η ′ , Z ψ ′ , Z L P ′ , and Z χ ′ models, respectively. It is shown that the sensitivity would benefit from the flavor tagging.
Background
The risk of aspiration is high in stroke patients due to dysphagia/loss of swallowing. This problem can cause problems affecting the nutrition of patients. Due to the possible risk of ...aspiration during feeding, patient relatives are hesitant to feed their patients. Because of this fear, malnutrition and hospital readmissions may increase. It is important to evaluate the fear of aspiration risk of relatives of patients hospitalized in the neurology service. The aim of this study is to determine the views of the relatives of patients treated in the neurology service about the risk of aspiration through metaphors.
Method
This article analyzed metaphors of patients' relatives' about the risk of aspiration. The analysis uses metaphor identification and analysis. The research sample consisted of 31 patients. First of all, in the study, evaluation of the data was conducted by performing content analysis, as a result of which it was divided into metaphors and conceptual categories, and the relevant field was associated with the text (event, thought, feelings, related in speech or writing). In the reporting of research, the Consolidated Criteria for Reporting Qualitative Research (COREQ) checklist was used.
Results
It was seen that the patients' relatives produced 31 different metaphors in response to the statement ‘Aspiration risk is like …, because it is …’ The patients' relatives mostly compared the concept of ‘fear of aspiration’ to the concept of ‘fear’ (n: 24).
Conclusions
In this study, relatives mostly described the concept of fear related to the risk of aspiration. According to this result, patients' relatives have a great fear of aspiration increasing the risk of readmission to hospital and of malnutrition. This result shows that informing patients' relatives will increase awareness and will allow them to provide informed care.
Patient and Public Contribution
Collaborated with patients and their relatives regarding the risk of aspiration and contributed to the planning of care for the risk of aspiration.
We study the single production of fourth-family quarks through the process
pp
→
Q
′
jX
at the Large Hadron Collider (LHC). We have calculated the decay widths and branching ratios of the ...fourth-family quarks (
b
′ and
t
′) in the mass range 300–800 GeV. The cross sections for the signal and background processes have been calculated in a Monte Carlo framework. It is shown that the LHC can discover single
t
′ and
b
′ quarks if the CKM matrix elements |
V
t
′
q
|,|
V
qb
′
|≳0.01.
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