Iris Publishers Journal Of Engineering Sciences

ISSN 2689-4246 (Online) | Current trends in clinical & medical sciences | The ISSN Portal : ISSN 2689-4246 (Online) | Current trends in clinical & medical sciences

Recycling Fine Aggregate from Demolished Hollow Concrete Block for Green Concrete in Ethiopia Authorized by Lucy Feleke Nigussie Construction industry in Ethiopia is growing fast due to rapid urbanization and accommodation demand for affordable housing for residents. This activity generates a large amount of construction and demolition wastes, which are commonly disposed of as landfill and cause environmental and economic impacts. Recycling construction and demolishing waste is one of the viable solutions to reduce environmental pollutions and makes construction sustainable by lowering the dependence on natural and non-renewable resources. In this study, the effect of recycled fine aggregate from the demolished hollow concrete block on the workability, density, and compressive strength of concrete was studied. A comparative analysis of the experimental results of fresh and hardened concrete properties with different replacement ratios of natural river sand by recycled fine...

ISSN 2641-6379 (Online) | World journal of agriculture and soil science | The ISSN Portal : ISSN 2641-6379 (Online) | World journal of agriculture and soil science

Finite Element Study of The Buckling of Cracked Thin Plates Repaired by Composite Laminate Under Compression Authorized by Liankun Wang In this paper, the elastic buckling of cracked thin plates repaired by composite laminate patch under compression was studied by the finite element method. The effects of the shape of the repairing patch, size of the repairing patch, and the thickness of the patch on the elastic buckling load were evaluated. The results show that the size and thickness of the repairing patch must be optimized to increase the performance of the repairing. To read more about this article:  Engineering Sciences To know more about  Journals :  Iris Publishers For more Information: https://irispublishers.com/gjes/fulltext/finite-element-study-of-the-buckling-of-cracked-thin-plates.ID.000558.php

ISSN 2641-6379 (Online) | World journal of agriculture and soil science | The ISSN Portal : ISSN 2641-6379 (Online) | World journal of agriculture and soil science

Analysis on the Characteristics and Management Countermeasures of Truck Crashes on Zhejiang Expressways Authorized by Li Zheng Ming Highway freight transport plays a very important role in China’s transportation industry. Therefore, the characteristics and laws of highway cashes are analyzed, and targeted preventive measures and suggestions for improvement are put forward, which can be very good guidance for highway management in other regions. Methods: A number of numerical analysis methods have been used to analyze 48861 truck cashes on Zhejiang expressways in the past five years. Various conversations with truck drivers suffice us to know the specific situations of the crash and suggestions for improvement of the management department. To read more about this article:  Engineering Sciences To know more about  Journals :  Iris Publishers For more Information: https://irispublishers.com/gjes/fulltext/analysis-on-the-characteristics-and-management-co...

ISSN 2641-6379 (Online) | World journal of agriculture and soil science | The ISSN Portal : ISSN 2641-6379 (Online) | World journal of agriculture and soil science

Discrete Model of Three Interacting Pacemakers Taking into Account the Time of Refractoriness as Applied to The Activity of Cardiac Fibrillation Authorized by Sergey Belyakin In this publication, we consider the model described cardiac tissue as an active conducting system, taking into account its self-oscillating properties; in the model, cardiac rhythms can be described on the basis of the theory of dynamic systems to justify the need to build a universal model of the oscillating medium. This model promotes understanding of such pathologies of cardiac activity as tachycardia and fibrillation. These studies are based on discrete - time representations (finite-difference equations). In this publication, we will consider in detail the main stages of development of these concepts and the corresponding mathematical concepts. To read more about this article:  Engineering Sciences To know more about  Journals :  Iris Publishers For more Information: https...

ISSN 2689-4246 (Online) | Current trends in clinical & medical sciences | The ISSN Portal : ISSN 2689-4246 (Online) | Current trends in clinical & medical sciences

Scientific Feat of The Kuban Cossack Authorized by Dunaev AV Professor, doctor of technical sciences, Kanarev Philip Mikhailovich, more than 25 years worked as head of the department of theoretical and applied mechanics at the Kuban state agrarian University, thoroughly, revolutionarily processed some sections of physics, chemistry, optics, electricity, electrodynamics, space exploration, refined knowledge in some other technical sciences. He published more than 10 books on physical, chemistry, but the professor was forced to address directly to the President of the Russia: «Dear Vladimir Vladimirovich! I am following your wise scientific and educational guidelines. But your subordinates ignore my desire to help you. I’m waiting for the from the Ministry of science and education staff involved in the publication of textbooks. But they disregard my scientific and educational achievements. This forces me to translate the new school textbook on physics and chemistry into E...

ISSN 2644-2981 (Online) | Global journal of nutrition & food science | The ISSN Portal : ISSN 2644-2981 (Online) | Global journal of nutrition & food science

Design and Implementation of the Astable Multivibrator Authorized by Edward Ong Yong Seng This progress report covers the design and implementation of the Astable Multi-vibrator. An Astable Multi-vibrator consists of two amplifying stages connected in a positive feedback loop by two capacitive-resistive coupling networks. The amplifying elements may be junction or field-effect transistors, vacuum tubes, operational amplifiers, or other types of amplifier. transistors, vacuum tubes, operational amplifiers, or other types of amplifier. The circuit is usually designed in a symmetric form as a cross-coupled pair. Two output terminals can be defined at the active devices, which will have complementary states; one will have high voltage while the other has low voltage, (except during the brief transitions from one state to the other). Circuitry testing and troubleshooting were carried out in the Astable Multi-vibrator in both designs. The latter wasn’t implemented due to ...

ISSN 2643-6884 (Online) | Online journal of cardiovascular research | The ISSN Portal : ISSN 2643-6884 (Online) | Online journal of cardiovascular research

The Urban Public Space as The Natural Space for Women Authorized by Hazhir Rasoulpour In this Article, explored urban public spaces and present a gendered perspective on women in public space, planning policies and urban theories. The Research referred to the scholarly literature on gendered and non-gendered typologies of urban public space to move towards. The argument about women and the urban public space. To read more about this article:  Engineering Sciences To know more about  Journals :  Iris Publishers For more Information: https://irispublishers.com/gjes/fulltext/the-urban-public-space-as-the-natural-space-for-women.ID.000553.php

ISSN 2641-6379 (Online) | World journal of agriculture and soil science | The ISSN Portal : ISSN 2641-6379 (Online) | World journal of agriculture and soil science

Controlled Synthesis of Hyperbranched Poly (ester)s From Biorenewable Monomers for the Delivery of Therapeutic Agents Authorized by Bob A Howell A series of hyperbranched poly(ester)s (HBPEs) has been prepared from renewable bio monomers using the Macosko-Miller conditional probability model (appropriate for monomers containing functional groups of unequal reactivity) to select ratios of reactants (ratios of reactive functional groups) to permit high monomer conversion without gelation and to assure the presence of specific reactive end groups. These materials have been fully characterized using spectroscopic, chromatographic and thermal methods and may serve as excellent platforms for the attachment of various therapeutic agents. Even though the conjugates were not water soluble, release of the active agents from fine suspensions of the conjugates occurred readily by hydrolysis in aqueous media under enzyme-catalyzed hydrolysis. The rate of release of the therapeutic age...

ISSN 2641-2039 (Online) | Global journal of engineering sciences | The ISSN Portal : ISSN 2641-2039 (Online) | Global journal of engineering sciences

Outside the Site Boundary Authorized by Chan Kwan Fai Timothy Site boundary is an important concern in the civil engineering field. Site boundary represents the extent of liability a person, group of people or even the whole society owed. Two issues may be resulted if our works have been implemented outside the site boundary. First, it may trespass to others and may damages their properties. Second, it may increase the cost of construction due to money spent on dispensable works. Owing to the extra cost and liability resulted, civil engineer used to consider the issue of site boundary. To read more about this article:  Engineering Sciences To know more about  Journals :  Iris Publishers For more Information: https://irispublishers.com/gjes/fulltext/outside-the-site-boundary.ID.000551.php

ISSN 2641-6379 (Online) | World journal of agriculture and soil science | The ISSN Portal : ISSN 2641-6379 (Online) | World journal of agriculture and soil science

Adaptive Sliding Mode Guidance Law Considering Input  Saturation and Autopilot Lag Authorized by Jun Guan In this article, a guidance law is developed using the sliding mode control theory. The law will have a good guidance performance when intercepting a maneuvering target under considering the input saturation and autopilot lag. Regarding the target acceleration as unknown bounded external disturbance, the adaptive control is designed to estimate the upper bound of the disturbance in such a way that it is not required to be known in advance. A sliding mode estimator is also presented to estimate the line-of-sight angle rate which the guidance law is required. According to the Lyapunov theory, the guidance law can be converted to zero is proved. Several simulations include 100 Monte-Carlo are made to valid the effectiveness of proposed guidance law. To read more about this article:  Engineering Sciences ...

ISSN 2641-6379 (Online) | World journal of agriculture and soil science | The ISSN Portal : ISSN 2641-6379 (Online) | World journal of agriculture and soil science

Fatigue Strength and Life Estimation Methods Using Critical Distance Stress Theory Authorized by Toshio Hattori Generally, the critical distance stress theory was applied for the fatigue limit estimation of general structures. In this method, it needs only two parameters, fatigue limit of smooth specimen (σw0), and threshold stress intensity factor range (ΔKth). In this paper we extended this method for the estimation of low cycle fatigue life too. In this improvement we define the critical distance (rc’) on static strength conditions, which is calculated using ultimate tensile strength (σB) and fracture toughness (KIC), in addition to the critical distance on fatigue limit condition (rc). Then the critical distances of any low cycle fatigue conditions can be calculated by interpolation of critical distance on fatigue limit (rc) with critical distance on static strength (rc’). By unifying these low cycle fatigue life estimation methods with high cycle fatigue limit estima...