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Search Results: 1 - 10 of 1108 matches for " Hindatu Yusuf "
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From Garbage to Biomaterials: An Overview on Egg Shell Based Hydroxyapatite
Idris Abdulrahman,Hamzat Ibiyeye Tijani,Bashir Abubakar Mohammed,Haruna Saidu,Hindatu Yusuf,Mohammed Ndejiko Jibrin,Sulaiman Mohammed
Journal of Materials , 2014, DOI: 10.1155/2014/802467
Abstract: The conversion of waste obtained from agricultural processes into biocompatible materials (biomaterials) used in medical surgery is a strategy that will add more value in waste utilization. This strategy has successfully turned the rather untransformed wastes into high value products. Eggshell is an agricultural waste largely considered as useless and is discarded mostly because it contributes to pollution. This waste has potential for producing hydroxyapatite, a major component found in bone and teeth. Hydroxyapatite is an excellent material used in bone repair and tissue regeneration. The use of eggshell to generate hydroxyapatite will reduce the pollution effect of the waste and the subsequent conversion of the waste into a highly valuable product. In this paper, we reviewed the utilization of this agricultural waste (eggshell) in producing hydroxyapatite. The process of transforming eggshell into hydroxyapatite and nanohydroxyapatite is an environmentally friendly process. Eggshell based hydroxyapatite and nanohydroxyapatite stand as good chance of reducing the cost of treatment in bone repair or replacement with little impact on the environment. 1. Introduction Agricultural waste is any waste being generated from different farming processes in accumulative concentration. Adequate utilization of agricultural waste reduces environmental problems caused by irresponsible disposal of the waste. The management of agricultural wastes is indispensable and a crucial strategy in global waste management. Waste of any kind in the environment when its concentration is in excess can become a critical factor for humans, animals, and vegetation [1]. The nature, quantity, and type of agricultural waste generated vary from country to country. The search for an effective way to properly manage agricultural waste will help protect the environment and the health quality. For sustainable development, wastes should be recycled, reused, and channelled towards the production of value added products. This is to protect the environment on one side and on the other side to obtain value added products while establishing a zero waste standard. The utilization of the waste is a priority today in order to achieve sustainable development [2]. One way that adds great value to agricultural waste is its utilization as a biomaterial used in medical surgery and therapeutics. The production of biocompatible material or biomaterial from agrowaste has added a different dimension to the utilization of agricultural waste for value added product. This is possible because some of this waste
The Dynamic Location Model to Consider Background Traffic  [PDF]
Nahry Yusuf, Sutanto Soehodho
Journal of Transportation Technologies (JTTs) , 2012, DOI: 10.4236/jtts.2012.21005
Abstract: This study concerns to the determination of location of freight distribution warehouses. It is part of a series of research projects on a distribution system we developed to deal with cases in a public service obligation state-owned company (PSO-SOC). This current research is characterized by the consideration of background traffic of the entire time period of planning rather than one certain time target on location model. It is aimed that the location decision to be more applicable and accommodative to the dynamic of the traffic condition. Once the decision is implemented, it will give the best outcome for the entire time period, not only for the initial time, end time or certain time of time period. A heuristic approach is proposed to simplify complexity of the model and network representation technique is applied to solve the model. A hyphotetical example is discussed to illustrate the mechanism of finding the optimal solution in term of both its objective function and applicability.
Prediction of the Bombay Stock Exchange (BSE) Market Returns Using Artificial Neural Network and Genetic Algorithm  [PDF]
Yusuf Perwej, Asif Perwej
Journal of Intelligent Learning Systems and Applications (JILSA) , 2012, DOI: 10.4236/jilsa.2012.42010
Abstract: Stock Market is the market for security where organized issuance and trading of Stocks take place either through exchange or over the counter in electronic or physical form. It plays an important role in canalizing capital from the investors to the business houses, which consequently leads to the availability of funds for business expansion. In this paper, we investigate to predict the daily excess returns of Bombay Stock Exchange (BSE) indices over the respective Treasury bill rate returns. Initially, we prove that the excess return time series do not fluctuate randomly. We are applying the prediction models of Autoregressive feed forward Artificial Neural Networks (ANN) to predict the excess return time series using lagged value. For the Artificial Neural Networks model using a Genetic Algorithm is constructed to choose the optimal topology. This paper examines the feasibility of the prediction task and provides evidence that the markets are not fluctuating randomly and finally, to apply the most suitable prediction model and measure their efficiency.
Unsaponifiable Matter in Carnuba (Cera carnuba) Wax, a Modification of the USP/NF and FCC Methods  [PDF]
Yusuf Yildiz, Manjista Dasgupta
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.78056
Abstract: Carnuba wax consists chiefly of myricyl cerotate (MW 817.4) and small quantities of free cerotic acid (C26H52O2, Mw 396.7) and myricyl alcohol (C30H62O, mp 90°C). Of the two common extraction solvents, ethyl ether or petroleum ether, Lewkowitsch prefers the former. Concerning separation of phases, he advocates addition of small amounts of alcohol or caustic, and he also states that formation of a flocculant layer between the aqueous layer and the solvent does not interfere with the correct estimation of the unsaponifiable matter. These statements were not corroborated in the hands of this chemist. The “Unsaponifiable Matter” in oils or and fats, which consist mainly of hydrocarbons, sterols and aliphatic alcohols of high molecular mass that are not saponifiable by alkali hydroxides but are soluble in the ordinary fat solvents, and to products of saponification that are soluble in such solvents. Carnuba wax, a rather expensive wax, may be adulterated with less expensive paraffin by dishonest merchants. ASTM has a method for determining paraffinic material in carnuba wax. It uses heptanes at its boiling point to dissolve the wax, apply it to a silica gel column, and elute only the nonpolar (i.e. alkane) material. The method has the disadvantage of using a large volume of haptane, nor is it called for by either US Pharmacopeia/National Formulary (USP/NF) or Food Chemicals Codex (FCC). The test for unsaponifiable matter on pure carnuba wax will yield a result of 50.0% - 55.0%, while a higher result will betray the presence of paraffin adulterants.
Yusuf Yusuf,Widyastutik Widyastutik
Jurnal Manajemen & Agribisnis , 2007,
Abstract: Peran utama sub sektor tanaman pangan adalah pemenuhan kebutuhan pokok penduduk Indonesia. Berdasarkan data BPS sebagian besar pangan masih diimpor dari luar negeri, akibatnya neraca perdagangan produk pangan Indonesia selalu mengalami defisit. Penelitian ini bertujuan untuk menganalisis pengaruh ekspor-impor komoditas pangan utama terhadap neraca perdagangan non-migas Indonesia dan menganalisis pengaruh liberalisasi perdagangan komoditas pangan terhadap neraca perdagangan non-migas Indonesia. Dalam penelitian ini metode analisa yang digunakan adalah erorr correction model (ECM) dan data yang digunakan adalah data time series triwulanan dari tahun 1993 sampai 2005 dengan tahun dasar 1996. Hasil Penelitian ini menunjukkan bahwa ekspor, impor dan liberalisasi perdagangan komoditas pangan berpengaruh negatif terhadap neraca perdagangan Indonesia baik dalam jangka pendek maupun dalam jangka panjang.
Evaluation of reliability characteristics of two dissimilar network flow systems
Ibrahim Yusuf,Bashir Yusuf
Applied Mathematical Sciences , 2013,
Abstract: This paper presents a study on reliability characteristics of two dissimilar systems.System I consist of two paths while system II consist of three paths. A signal flowfrom the source to the terminal through the paths. Failure times and service times ofeach system are assumed to be exponentially distributed. The failure and repair timesassumed exponentially distributed. Using Kolmogorov’s forward equations method,derivations for availability, busy period and profit function are presented in thispaper. Also numerical illustrations for the two systems are presented. Comparisonsare made based on assumed numerical values for the two systems.
High Frequency Oscillator Design Using a Single 45 nm CMOS Current Controlled Current Conveyor (CCCII+) with Minimum Passive Components  [PDF]
Mohd Yusuf Yasin, Bal Gopal
Circuits and Systems (CS) , 2011, DOI: 10.4236/cs.2011.22009
Abstract: In the field of analog VLSI design, current conveyors have reasonably established their identity as an important circuit design element. In the literature published during the past few years, numerous application have been reported which are based on a variety of current conveyors. In this paper, an oscillator circuit has been proposed. This oscillator is designed using a single positive type second generation current controlled current conveyor (CCCII+). A CCCII has parasitic input resistance on it’s current input node. This resistance could be exploited to reduce circuit complexities. Thus in this accord, a novel oscillator circuit is proposed which utilizes the parasitic resistance of the CCCII+ along with a few more passive components.
Analysis of Stochastic Reliability Characteristics of a Repairable 2-out-of-3 System with Minimal Repair at Failure  [PDF]
Ibrahim Yusuf, Fatima Salman Koki
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.48151

In this paper, we study the reliability and availability characteristics of a repairable 2-out-of-3 system. Failure and repair times are assumed exponential. The explicit expressions of reliability and availability characteristics such as mean time to system failure (MTSF), steady-state availability, busy period and profit function are derived using Kolmogorov’s forward equations method. Various cases are analyzed graphically to investigate the impact of system parameters on MTSF, availability, busy period and profit function.

Configuration for Predicting Travel-Time Using Wavelet Packets and Support Vector Regression  [PDF]
Adeel Yusuf, Vijay K. Madisetti
Journal of Transportation Technologies (JTTs) , 2013, DOI: 10.4236/jtts.2013.33023
Abstract: Travel-time prediction has gained significance over the years especially in urban areas due to increasing traffic congestion. In this paper, the basic building blocks of the travel-time prediction models are discussed, with a small review of the previous work. A model for the travel-time prediction on freeways based on wavelet packet decomposition and support vector regression (WDSVR) is proposed, which used the multi-resolution and equivalent frequency distribution ability of the wavelet transform to train the support vector machines. The results are compared against the classical support vector regression (SVR) method. Our results indicated that the wavelet reconstructed coefficient when used as an input to the support vector machine for regression performed better (with selected wavelets only), when compared with the support vector regression model (without wavelet decomposition) with a prediction horizon of 45 minutes and more. The data used in this paper was taken from the California Department of Transportation (Caltrans) of District 12 with a detector density of 2.73, experiencing daily peak hours except most weekends. The data was stored for a period of 214 days accumulated over 5-minute intervals over a distance of 9.13 miles. The results indicated MAPE ranging from 12.35% to 14.75% against the classical SVR method with MAPE ranging from 12.57% to 15.84% with a prediction horizon of 45 minutes to 1 hour. The basic criteria for selection of wavelet basis for preprocessing the inputs of support vector machines are also explored to filter the set of wavelet families for the WDSVR model. Finally, a configuration of travel-time prediction on freeways is presented with interchangeable prediction methods.
Assessment of Profit of a Two-Stage Deteriorating Linear Consecutive 2-out-of-3 Repairable System  [PDF]
Ibrahim Yusuf, Fatima Salman Koki
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.13005

Most of the researches on profit and cost evaluation of redundant system focus on the effect of failure and repair on revenue generated. However, as these systems continue to work, their strength gradually deteriorates. Where such deterioration occurs, minor and major maintenance is employed to remedy the deterioration. Little or no attention is paid on the effect of deterioration on the impact of deterioration and their maintenance on the revenue generated. In this paper, we study the profit generated of two-stage deteriorating linear consecutive 2-out-of-3 system. Failure, repair and deterioration time are assumed exponential. The explicit expressions of availability, busy period of a repairman and profit function are derived using Kolmogorov’s forward equations method. Various cases are analyzed graphically to investigate the effect of deterioration parameters such as slow deterioration, fast deterioration, and their maintenance such as minor and major minimal maintenance on profit generated.

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