A total of two high performance slender shear walls were cast and subjected to quasi static lateral reversed cyclic loading till failure. The specimens were designed and detailed according to ACI Building Code (ACI Committee 318, 2008). Mix design of high performance concrete (HPC) was done based on the guidelines given in modified ACI 211method suggested by Aitcin. Strength, Load- deformation response, Stiffness degradation and Energy absorption capacity of walls were critically examined and analyzed. The crack patterns in the critical region were horizontal and the flexural failure mode was observed in specimens. The ultimate strength of the wall Predicted by ACI 318-2008 shows good correlation with the experimentally measured values of horizontal load.
Concrete is most widely used construction material due to its versatile properties. Concrete is strong in compression but weak in tension. Steel reinforcements are used in concrete to resist tensile forces in structural members. Artificial discontinuous fibres are also used to improve cracking resistance of concrete and toughness. Research works are being carried out on various types of artificial and natural fibres available and their performance in cement concrete. The literature is rich and various textbooks and research papers are already available. With the awareness of development of eco-friendly cost effective concrete materials, scientist and researchers have tried different types of natural fibre materials like sisal, jute, flax, bamboo, sugarcane bagasse etc;. Though these fibres are renewable and ecologically advantageous, they have some limitations such as lower durability and lesser strength. But recent research provides several treatment processes to enhance the durability of
naturalfibres. Moreover, they give less concern with safety and health during handling of fibre products. The trend of research on natural fibre reinforced concrete composite is now increasing due increase in cost of high energy materials and also availability of solutions to improve durability of natural fibres in concrete. Many literatures have indicated various advantages in the use of natural fibers in cement composites, among them the following: increased flexural strength, post-crack load bearing capacity, increased impact toughness and improved bending strength Natural fibers exhibit many advantageous properties as reinforcement for composites Economic and other related factors in many developing countries where natural fibres are abundant, demands that scientists and engineers apply appropriate technology to utilize these natural fibres as effectively and economically as possible to produce good quality fibre reinforced composites in concrete or polymer matrix for housing and other needs. At the present time, due to simultaneous awareness increase onenvironment and energy, increasing attention should be paid to natural fibers with a view to conserving energy and protecting the environment. Also in the economic interests of developing countries, there is an urgent need for new application areas for these natural fibres. In this paper, a general review of current research works on fibre reinforced cement concrete and cement mortar using selected types of natural fibres are presented.
This paper provides an overview of the state of art of reverse logistics and current status of waste management problemswith special emphasis on developing countries. Logistics activities have been practiced and played a fundamental role in theglobal economic development. It has then been transformed into different logistics branches and elaborates the emergency ofreverse logistics as one of the most important. The paper presents the evolution of logistics into reverse logistics and how it relatesto waste management both in the developed and developing world. Reverse logistics is a relatively new phenomenon in theresearch area which is mainly referring to damaged goods, the take back of products that should be returned to the manufacturersor distributors. Reverse logistics is relatively more practiced in an organized way in the developed world than in the developingcountries in that the latter provided less value additions on reversed products.
There are many reasons of noise and accidents of automobiles. One of the reasons amongst them is vibrations generated when automobiles are running. It has been found that there are many reasons for generation of such kind of vibrations. One of the= reasons is excess weight of automobile components. This excess weight is created at the time of various manufacturing processes. Weight balancing is one of the important tasks which are performed before the final product is to be dispatched to other department. This task is important as it gives the information about amount of excess weight product have. This excess weight isnothing but the unbalanced weight. This unbalanced weight must be removed from the component to avoid the problems which may come in future.To remove this unbalanced weight various techniques are available. Milling is one of the technique which more popularamongst them. So that first of all Balancing is to be performed so that it would give amount of unbalanced weight and exact location where it is present so that it can be removed by milling. As , these two methods are going to perform on two different workstations it would take more time which would lead to poor productivity and also it would cost more.
The most attractive feature of compression ignition (diesel) engine is its excellent fuel efficiency, low sensitivity in terms of air-fuel ratio variations, high torque and high tolerability in peak cylinder pressures and temperatures. However, they emit higher amount of visible exhaust termed as smoke and this smoke is very much high during transient operation, especially in turbocharged diesel engine. Hence control of transient emissions from turbocharged diesel engine is an important objective. Starting in particular, is process of significant importance owing to its major contribution to the overall emissions during transient test cycle. A present paper includes study of peculiar smoke behavior during steady state and transient operation of turbocharged diesel engine. A methodology was established for carrying out transient simulation using one-dimensional modeling. Experimental study was carried out to collect engine performance and emission related data. As turbocharger lag one of the predominant parameter in transient emission, this paper made emphasis on effect of various turbocharger design parameters like type and size of housing of turbine and compressor side, speed, material of turbine and compressor which helps in reducingturbocharger lag. Simulation results showed that reduction in smoke emission can be achieved by increasing compressor speed, reducing turbine housing, increasing air flow and which was further validated by experimental results.
Vaibhav J. Suryawanshi, S. V. Bhaskar, L. S. Dhamande
Many practical rotor dynamic systems contain shaft/rotor elements that are highly susceptible to transverse crosssectionalcracks due to fatigue. The early detection of mechanical malfunction that can be provided by an effective vibration monitoring system is essential. Two theoretical analyses, global and local asymmetry crack models, are utilized to identify characteristics of the system response that may be directly attributed to the presence of a transverse crack in a rotating shaft. The work reported in this paper is part of an ongoing research on the experimental investigations of the effects of cracks and damages on the integrity of structures, with a view to detect, quantify, and determine their extents and locations. As crack initiates and propagates the natural frequency and mode shape of different machine element changing. therefore the change in natural frequency and mode shape is effective way to identify the crack .in this paper review of different methods carried out for
investigation crack detection in a rotor or shaft system.
This paper presents the information about slug force in the piping system and determination of slug force in the systems as per the process requirements. The force caused by two phases of the flow (liquid and gas) on the pipe bend is determined in this paper. Slug flows are extremely interesting multiphase regime phenomena which frequently occur in flexible marine risers used by the petroleum industry in offshore environments and have both a liquid and gaseous phase. Generally, the gaseous phase is pumped in together with the liquid phase to facilitate the suction of the latter. Literature and experimental observations show awide range of multiphase regimes which are the result of numerous parameters such as liquid and gaseous discharge, the pipe diameter and its inclination.
: Bioactive glasses are a type of glass ceramic material developed to be used as bioresorbable therapeutic bone implants.Thermal treatment of bioactive glass ceramics dictates many important features such as microstructure, degree of crystallinity,mechanical properties, and mineralization. This study investigates the feasibility of improving the mechanical properties of meltcast bioactive glass 45S5 by inducing crystallinity in it. A comparative study of fracture behaviour in amorphous and crystallinephases of bioactive glass 45S5 revealed crack deflections and higher fracture resistance in partially crystallized bioactive glass.Such toughening is likely attributed to different crystallographic orientations of crystals or residual thermal mismatch strains.
As per regulation of Public Safety Standards of the Republic of India Transport Engineering regarding automotivevehicle brake lining material Part I and part II Specification and material and their range is made available under IS 2772 to thepublic under the provisions of the Bureau of Indian Standards Act of 1986 and the Right to Information Act of 2005. In order topromote public education and public safety, a better informed citizenry, the rule of law. In this work rang and material fordevelopment of brake liner composition has been taken as per IS code 2472 applicable on automotive brake liner. Present paperinvestigate that the selection of brake friction materials is based on as per regulation of Public Safety Standards of the Republic ofIndia code IS 2472.
This work investigate the effect of reinforcing friction composites by non-asbestos organic fiber with object to replace the asbestos due to the health hazards caused by its fibers which may cause mesothelioma, asbestosis, and lung cancer. Asbestos is replaced by the tested non asbestos organic fiber such as, vermiculite, Rockwool, aramid, ceramic and glass. The developed composites contain barium sulfate, aluminum oxide, copper powder, Al fiber, Graphite, Cashew dust Friction dust. None material is exactly like asbestos but they can offer some similar performance characteristics. This study also work toward finding of suitable replacement of asbestos fiber by vermiculite (hydrated calcium aluminum silicate), Rockwool (blast furnace slag or basalt), ceramic fiber, chopped glass fiber, and aramid fibers .The fiber material play a significant role to determine friction and wear behavior of brake liner composite material. The friction and wear of the composites with fiber have been investigated at different values of applied loads. Based on the experiment in the present work, it can be concluded that the tested non asbestos organic fiber can replace asbestos in reinforcing the friction composites, where their friction and wear properties were much betterthan asbestos.
Kirti Agashe, Dr. Nisha Sarwade, Dr. Sangeeta Joshi
For nearly 180 years, circuit theory is studied with three fundamental circuit elements, the resistor, the capacitor and the inductor. These passive two terminal elements describe the relations between voltage, current, charge and flux but do not storeinformation. On this back ground, in 1971 Prof. Leon .O. Chua presented a revolutionary concept of the existence of the fourth missing element called "Memristor" in the list of three basic electrical circuit elements. Introduction of the nano scale Memristor(Resistor with Memory) that can store information without the need of a power source is a paradigm change in fundamental circuit elements [1, 2, 3]. Memristor has tremendous potential to replace conventional flash memories in near future. Its emergingapplications include a wide range from analog /digital computation circuits to neuromorphic circuits. Introduction of non linearMemristor is enhancing the quantum computing processing and understanding of biological processes . Due to its novel characteristics and diversifying application potentials, nano scale Memristor is getting a lime light focus from researchers as well as from industry. This paper will discuss the fundamental properties, basic device model and prominent application areas ofMemristor as an advancement in fundamental circuit element.
We systematically investigate the bond length dependence on rectifying properties of 4'-thiolate-biphenyl-4- dithiocarboxylate (TBDT) connected to two Ag electrodes using first-principles calculations. The bonding effect is calculated in five cases and found that bond length variation can effectively tune the rectifying behavior in molecular devices. Further study shows that the highest rectification ratio can be enhanced up to 34% on increasing S-Ag bond lengths by 0.2Å, which is mainly caused by increase in asymmetrical coupling between the molecule and the electrodes. Our finding highlights that rectifying characteristics are intimately related to bond lengths and can provide an important support in designing of a molecular rectifier.
Mobile Ad-hoc Network (MANET) is an infrastructure less, decentralized, network consisting of wireless mobile nodes which changes the topology dynamically. Because of dynamic change in the network topology, the routing protocols are critical issues in MANET. In this paper the conventional Ad-Hoc On Demand Distance Vector (AODV) routing protocol is simulated in NS2 environment. AODV is an on demand reactive protocol as it determines the routes only when nodes have some data to send/transmit. It combines the properties of both DSDV and DSR protocol. The Simulations are carried to observe the effect of variation in number of nodes i. e. network size and simulation time. For each variation of the parameters, the performance of AODV is evaluated in terms of average network Throughput, Packet Delivery Ratio, End to End Delay and Routing Overhead.
Ms Nehal Dharamshi, Mrs Bhavna Ambudkar, Dr.A.P.Dhande
The Next Generation of wireless networks will provide ubiquitous computing by the seamless operation of heterogeneous wireless networks. It will integrate the current co-existing wireless networks to allow the users to connect to the network that best suits their needs. The next generation wireless networks are characterized by anywhere, anytime connectivity, enhanced data services and higher data rates to end-users. This infrastructure will also support efficient handovers. New technologies such as IEEE 802.11 WLAN, Bluetooth, IPERLAN/2, GPRS/EDGE, cdma2000 and WCDMA aim to achieve this. To facilitate new services, and make them flexible and bandwidth efficient, vertical roaming of mobile nodes is a tempting possibility for operators. This paper presents simulation results for mean throughput obtained in vertical handoff heterogeneous networks. An optimization scheme for mobile users performing vertical handoffs is presented with analysis.