Journal of Brilliant Engineering (BEN)

Ali Kemal Çakır

Increases of product in manufacturing processes have made its impact felt in Turning, one of the important branches of the industry. Increases in manufacturing also increase energy consumption. We can achieve this with efficiency studies in energy consumption. Energy efficiency studies to be carried out will reduce carbon emissions that will be revealed in turning processes and harm the environment. There are many studies on optimization of cutting parameters in turning processes. However, there are few studies on the effect of optimization of cutting parameters on energy efficiency and carbon emission values. This study has been trying to resolve this tartness. In the study, the efficiency calculation was made by extracting the exergy values of the processes of turning DIN 1.2367 steel material. In addition, processes in turning other metals can be determined and exergy calculations and efficiency values of these processes can be derived.

https://doi.org/10.36937/ben.2021.004.001

Alireza Javadi

Pyrite (FeS2), chalcopyrite (CuFeS2), sphalerite (ZnS) and galena (PbS) generate hydrogen peroxide (H2O2) when placed in water, that pyrite the most amount of H2O2. The order of these minerals for generate of H2O2 in presence water is pyrite > chalcopyrite > sphalerite > galena. In the previous research, the methods of generation of H2O2 in the grinding mill have been studied but its effect on the oxidation of pulp components and hence in deteriorating the concentrate grade and recovery in flotation has not been explored yet. In this study, some parameters investigated to control the deleterious effects of H2O2 in flotation. The data from experimental have been attached by using MODDE 9 software for 6 parameters consist of composition of water, grinding media, particle size, pH, adding collector among the grinding, adding depressant. Finally, the optimize condition has been achieved: particle size 75 μ, process water, adding all collector, without depressant and pH 10. These changes in flotation response of sulphides have been discussed and explained with the formation of H2O2 quantitatively and the results are presented and discussed in terms of H2O2 generation vis-à-vis concentrate grade and recovery in flotation.

https://doi.org/10.36937/ben.2021.004.002

Farhad Sakhaee

This study investigates runup design at breakwaters and design criteria under tidal and ebb scenarios for both head and truck of Nowshahr breakwater. First part includes runup height calculations based on shore protection manuals. Based of wave height, frequency, and water depth at the toe runup height has been calculated and Second portion has been dedicated to design of head and truck of Nowshahr port based on Hudson stability formula. Collision of wave and the breakwater head, results in immediate reduction in wave energy. As wave energy propagated gradually decreases when it meets the trunk. The results showed that in both conditions weight of head would be higher than the trunk of breakwater. while, both head and trunk are designed based on high strength materials, but the head has higher degree of importance in terms of design criteria. Hudson formula is responsible for the stability of breakwater structure. Tidal case which considers a non-breaking wave as well as ebb scenario including a breaking wave has been studied to include two extreme conditions occurs to breakwaters. The results showed the higher weight of head is responsible for stability of breakwater at both conditions.

https://doi.org/10.36937/ben.2021.004.003

Mohammad Rashedul Haque Mohammad Belal Hossain Mohammad Roknuzzaman Noor-A-Afrin Emu Fatema Tuz Jahan

Disposal of plastic bottles made from Poly-Ethylene Terephthalate (PET) is a worldwide problem. Green concrete, made with one or more recycled items, is also a trendy concept in the sustainable construction sector. The current study is to investigate the possibility of using recycled PET waste bottles as a partial replacement of natural coarse aggregate in green concrete to get marginal effective compressive strength and workability. Two different sizes of PET fiber such as 10mm*10mm and 19mm*19mm are used. Four different replacement percentages such as 0% (control), 1%, 5%, and 10% of coarse aggregate are adopted with a fixed water-cement ratio of 0.42. A total of 42 cylindrical specimens are prepared and conventional water curing is done for 7 days and 28 days. Compressive strength for control specimen (0%) after 7 days and 28 days curing is found as 39.96 MPa and 53.42 MPa respectively. On the other hand, the compressive strength of specimens with 10mm*10mm plastic fiber is found to be 22.40 MPa, 16.14 MPa & 11.83 MPa after 7 days curing and 38.48 MPa, 25.81 MPa & 20.08 MPa after 28 days of curing for 1%, 5%, and 10% replacement of coarse aggregate respectively. For 19mm*19mm plastic fibers, these values are 21.22 MPa, 7.99 MPa & 4.29 MPa after 7 days of curing and 35.82 MPa, 11.36 MPa & 7.03 MPa after 28 days of curing for the same percentages. The findings of the study may serve as a guideline for deciding the replacement percentage and fiber size for preparing PET-based green concrete.

https://doi.org/10.36937/ben.2021.004.004

dana prochazkova

The human’s lives are strongly dependent on operation of socio-cyber-physical systems that create vitally infrastructure of human society system. These systems are complex systems, which have form “systems of systems”. Due to complexity, these systems are threatening not only by risks influencing their elements, but also with risks connected with uncomfortable links and flows among elements, which occur at critical conditions due to occurrence of unexpected interdependences. The aim of risk management of socio-cyber-physical systems at operation is the integral safety which ensures their co-existence with their vicinity throughout their life cycles. On the basis of present knowledge and experience, part of risks that threaten socio-cyber-physical systems is coped by preventive measures during their designing and manufacturing. Due to dynamic changes of the world, the conditions of socio-cyber-physical systems at operations change. If changes exceed the socio-cyber-physical systems´ safety limits which were inserted into their designs, the accidents or socio-physical -cyber-physical systems´ failures occur. The presented risk management plan is tool which ensures the correct response to such unaccepted situations and fast ensuring the safety.

https://doi.org/10.36937/ben.2021.004.005