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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 426 journals)
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  • Comparison of influence of surfactants on thermokinetic characteristics of
           alkali-activated slag cement

    • Authors: Pavlo Krivenko; Igor Rudenko, Oleksandr Konstantynovskyi
      Abstract: Increasing the durability of concrete and reinforced concrete structures according to the criterion of crack resistance is a relevant task of construction materials science. To solve this task, this paper proposes effective solutions for adjusting thermofinite characteristics of alkali-activated slag cement (ASC) by using surfactants of various chemical nature in order to control the thermally-stressed state of concrete based on it (ASC concrete). The method of calorimetry was applied to show that the problematic issue is to adjust the structure formation of ASC by anion-active surface-active substances based on complex polyesters. This is predetermined by the instability of the molecular structure of surfactants in the hydration environment of ASC due to the destruction of complex ester bonds as a result of alkaline hydrolysis. Thermokinetic analysis has demonstrated the effectiveness of using anion-active surfactants, which do not contain ester bonds, as regulators of crack resistance of ASC concrete. Simple polyesters and multi-atom alcohols provide the ability to adjust the duration of the induction period while ensuring the required completeness of ASC hydration within a time frame. The effectiveness of cation-active surface-active substances has been shown, which are characterized by the stability of the molecular structure in the hydration environment of ASC and an increased level of adsorbing capacity. The decrease in the effectiveness of surface-active substances has been shown, in terms of the effect on the heat release of ASC, in the following series: alkaline salt of carboxylic acid>salt of the quaternary ammonium compound>simple polyester> polyalcohol>complex polyester. The reported results are important in view of the possibility of effective adjustment of ASC heat release by influencing the structure formation of surfactant with a certain molecular arrangement in order to predictably reduce crack formation in a thermally-stressed state and a corresponding increase in the durability of structures
      PubDate: Fri, 03 Dec 2021 00:00:00 +020
       
  • The Impacts of Technological and Managerial Complexity of Project
           Management in Khyber Pakhtoonkhawa, Pakistan. Engr. SalimJaved1 ,
           Professor Dr. MehboobAlam Iqra National University, Peshawar Pakistan.

    • Authors: Engr salim Javed
      Abstract: ABSTRACT The study deals with problems associated with the Construction Engineering areas and therefore the methods, as well as problems, have been selected with an emphasis on applications to Construction Engineering. In this study, two main Project Complexity tasks are described - the Project Complexity as a “management” problem and the Water Management as an “engineering” one. Several categories among Project Complexity problems are described and some solutions from the Project Complexity area are cited. The study aims as an engineering example of a single-objective Project Complexities (SOPCs) problem, Water Users Associations (WUAs) of On-Farm Water Management (OFWM) and its use for a Project Complexities & Water Management (PCs &WM) model parameters prediction is presented in this study. A traditional method for WUAs training used herein is the well-known Background ladder method, which uses an umbrella-based approach of project application and adaptation to the prevailing scenario and locale to minimize an output error. This model is a fully three-dimensional approach of Linear, Horizontal, and Vertical Project Complexities and Water Management at different combinations of Project Complexities and Water Management along with the development of a new model in the shape of a Ladder Approach. The first main result is that this complex project adoption and adaptation of complex projects in water management in third world areas e.g. KPK of Pakistan can be solved by a parallel analysis in reasonable time & locale. The second outcome is the fact that the objective function corresponding to the identification problem has several local minima, which are characterized by similar values but are far from each other. To solve the above-mentioned obstacles and in the view of recent research in this domain, a new methodology is also presented: As a novel approach, the umbrella approach of complex projects can be used here for the same purpose. It is shown that obtained errors are much lower than the outputs obtained from the Background ladder method. Next, an identification of the integration of complex projects as in the David model [David et al., 2000] is investigated.
       
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    • Authors: Aliona Dikhtyar; Svetlana Andrieieva, Natalia Fedak, Olga Grinchenko, Yevgen Pyvovarov
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    • Authors: Olga Samokhvalova; Kateryna Kasabova, Nataliа Shmatchenko, Aleksey Zagorulko, Andrii Zahorulko
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    • Authors: Edwin Gevorkyan; Volodymyr Nerubatskyi, Volodymyr Chyshkala, Yuriy Gutsalenko, Oksana Morozova
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    • Authors: Irina Polyakova; Raikhan Imambayeva, Bakyt Aubakirova
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    • Authors: Viktor Boltenkov; Olexander Brunetkin, Yevhenii Dobrynin, Oksana Maksymova, Vitalii Kuzmenko, Pavlo Gultsov, Volodymyr Demydenko, Olha Soloviova
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    • Authors: Marina Savchenko-Pererva; Oleg Radchuk, Ludmila Rozhkova, Hanna Barsukova, Oleksandr Savoiskyi
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  • Taguchi’s Robust Design Approach: A Comprehensive Literature Review
           and Analysis

    • Authors: Abebaw Mulat
      Abstract: Business firms are formed to attain an objective, assignment, or a goal but they will merely ensure accordingly if they gratify the requirements, desires, and prospects of their shareholders. Their clients, as one of the shareholders, will be contented only if they deliver goods and services that converge their demands, stipulation, and prospects. To meet all this, the process parameters in a manufacturing system should be optimized. Optimization problems are found in many sorts of manufacturing frameworks. A large portion of these issues is NP-hard. Various explore works identified with Taguchi’s Robust Design have been distributed. A limited review works occur, but they are not the latest or are limited to definite particular features of these issues. This paper provides a comprehensive review of Taguchi’s Robust Design Approach publications published with a particular focus on applications in the manufacturing sector and the paper refreshes and broadens the order created in the before paper and covers 40+ papers distributed from 2012 to 2021. The writing investigation given here is later and not confined to particular contemplations about designing a robust process.
       
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    • Authors: Yuriy Tsapko; Аleksii Tsapko, Olga Bondarenko
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    • Authors: Vadim Yakovenko; Bohdan Volochiy, Yuriy Sydorenko, Nataliia Furmanova, Oleksandr Malyi, Anton Tkachenko, Yurii Olshevskyi
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    • Authors: Nader S. Santarisi; Sinan S. Faouri
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    • Authors: Alexandr Neftissov; Andrii Biloshchytskyi, Olzhas Talipov, Oxana Andreyeva
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    • Authors: Ayaulym Rakhmatulina; Nurbibi Imanbayeva, Sayat Ibrayev, Assemgul Uderbayeva, Aiman Nurmaganbetova
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    • Authors: Mykola Kuznietsov; Olga Lysenko, Andrii Chebanov, Dmytro Zhuravel
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    • Authors: Agus Tugas Sudjianto; Aji Suraji, Sugeng Hadi Susilo
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    • Authors: Ihor Strashynskyi; Victoria Grechko, Oksana Fursik, Vasyl Pasichnyi, Andrii Marynin
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    • Authors: Svitlana Achkasova; Yevheniia Malyshko
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  • Improved Performance of Corrugated Metal Gaskets on Boiler’s Piping
           System Through Multi Layered Coating

    • Authors: Didik Nurhadiyanto; Shigeyuki Haruyama, Mujiyono, Sutopo, Yunaidi, Fredy Surahmanto, Novian Indra Kusuma, Moch Agus Choiron, Nur Chalid Fauzi
      Abstract: The corrugated metal gasket is still in the early stages of development. However, gasket contact flanges with a high surface roughness (more than 3.5m) leak and require a lot of force to tighten. The goal of this study is to use copper and nickel coatings to improve the performance of corrugated metal gaskets. Copper or nickel infiltrates the pipe flange's rough surface, preventing leaking. The purpose of this study is to investigate the performance of a coated corrugated metal gaskets in a boiler system. The water leak was trickling on the white paper that had been placed beneath the gasket. The thermal camera can detect vapor leaks. The results of the studies reveal that the corrugated gasket's performance is improving, as seen by the reduction in leakage. At highest pressure and lowest tightening force, neither type of gasket leaked.
       
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    • Authors: Nataliia Fialko; Roman Dinzhos, Julii Sherenkovskii, Nataliia Meranova, Sergii Aloshko, Diana Izvorska, Volodymyr Korzhyk, Maxim Lazarenko, Irina Mankus, Liudmyla Nedbaievska
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