Archives-December 

Cavitating flows are highly complicated because it is a rapid phase change phenomenon, which often occurs in the high-speed or rotating fluid machineries. It is well known that the cavitating flows rise up the vibration, the noise and the erosion. Therefore, the research on the cavitating flows is of great interest. Numerical method is highly important approach for studying the cavitating flow. The propeller is the predominant propulsion device used in ships. The performance of propeller is conventionally represented in terms of non-dimensional coefficients, i.e., thrust coefficient (KT), torque coefficient (KQ) and efficiency and their variation with advance coefficients (J). It is difficult to determine the characteristics of a full-size propeller in open water by varying the speed of the advance and the revolution rate over a range and measuring the thrust and torque of the propeller. Therefore, recourse is made to experiments with models of the propeller and the ship in which the thrust and torque of the model propeller can be conveniently measured over a range of speed of advance and revolution rate. Experiments are very expensive and time consuming, so the present paper deals with a complete computational solution for the flow using STAR-CCM+ software. When the operating pressure was lowered below the vapor pressure of surrounding liquid it simulates cavitating condition. In the present work, STAR-CCM+ software is also used to solve advanced phenomena like cavitation of propeller. The simulation results of cavitation and open water characteristics of propeller are compared with experimental predictions, as obtained from literature [1].

The Fourier transform Raman (FT-Raman) and Fourier transform infrared (FTIR) spectra for Lamivudine in the solid phase have been recorded in the region 4000–100 and 4000–400 cm ^-1 , respectively, compared with the harmonic vibrational frequencies calculated using density functional theory (DFT) (B3LYP) and Restricted Hartee Fock (RHF) method by employing 6-31G (d,p) basis set with appropriate scale factors. Optimised geometries of the molecule have been interpreted and compared with the reported experimental values. The experimental geometrical parameters show satisfactory agreement with the theoretical prediction from DFT. The scaled vibrational frequencies seem to coincide with the experimentally observed values with acceptable deviations. The theoretical spectrograms (IR and Raman) have been constructed and compared with the experimental FTIR and FT-Raman spectra. The UV spectrum was measured in methanol. In order to gain some insight into the recorded spectrum, the quantum mechanical calculations were performed for Lamivudine using TD DFT with B3LYP/6-31G(d,p) basis set. The optimized molecular geometry, bond orders, harmonic vibrational wavenumbers of Lamivudine were calculated by Restricted Hartree Fock and Density functional B3LYP method with the 6-31G(d,p) basis set using Gaussian 03W program.

Recent research is to recognize and rank the critical factors of success to execute customer oriented strategy management by using AHP in three levels human, process and technology. Required information of this research is gathered through two questionnaires in three individual groups, and then extracted information has been analyzed by EC software and A.H.P technology then is prioritized. What is considered as a research problem in the study is to recognize and rank the critical factors of success to execute customer oriented strategy management by using A.H.P. This research has been discussed by using the problem CSFs and the perspective of analysis of system, first by determining and prioritizing organizational CSF in the firm. Recognizing recent position of current performance of CSFs and determining the success that put human priority for the research would be studied.

Regulatory requirements for various countries of world vary from each other. Therefore, it is challenging for the companies to develop a single drug which can simultaneously submitted in all countries for approval. Africa is the second fastest growing pharmaceutical market in the world and is driven by a small number of countries like south-Africa, Nigeria, Ghana, East-Africa, North Africa. During the past decade, the African continent has been home to some of the fastest-growing economies in the world, creating a large window of opportunity for the development of the pharmaceutical sector. Africa’s pharmaceutical sector was expected to reach about 30 billion US Dollars by 2016. The main objective of this study is to discuss about the various parameters and requirements for Registration of externally developed pharmaceutical products in North Africa for Approval. Pre-Requisite knowledge of country specific Guidelines and norms is very important to analyse the similarities and differences between the regulatory requirements of different countries. The Pharmaceutical Market in Africa is growing fast at a Compound annual growth rate (CAGR) of 10.6%. The value of Africa’s pharmaceutical industry jumped to $20.8 billion in 2013 from just $4.7 billion a decade earlier. That growth is continuing at a rapid pace: the market will be worth $40 billion to $65 billion by 2020. The purpose of this study is to focus on the key assessment parameters required for developing a pharmaceutical product so that it can be simultaneously registered in numerous African countries for approval.

In the present paper the system considered consists of two subsystems A and B. Subsystem A consists of identical operating and warm standby units. While subsystem B has two dissimilar units: main unit and a unit in cold standby. Main unit of subsystem B is assumed to be more efficient than the standby unit so when the main unit fails the system goes to the state of low efficiency. Main unit is connected to cold standby unit with a switching over device. Further, whenever there is a failure in one of the units of A and in the main unit of subsystem B, the system goes to critical state where system has to stop functioning to avoid the further failures. Also we have considered that the company providing repair facility has appointed a repairman. The repairman repairs the system in case of minor failures but when the system fails completely he has to take it to the nearest service station of the company for repair. By applying Supplementary variable technique, Laplace transformations and copula methodology transition state probabilities, asymptotic behaviour, reliability, availability, M.T.T.F., cost effectiveness and sensitivity of the system have been determined. Particular cases corresponding to the situations when the standby unit of subsystem A is in cold standby and in hot standby have also been considered. At last some numerical examples have been taken to illustrate the model.

Minimum weight spanning tree is a well known graph optimization problem, which has a wide range of applications in telecommunications and routing problems. The problem considered in this paper is to find the second minimum weight spanning tree for a given network. A new algorithm is proposed and its computational complexity is discussed with numerical illustrations.

A Common effective method i.e. base isolation systems is used to reduce the seismic response of liquid storage tanks. In this work a method for dynamic analysis of liquid storage tanks isolated by the lead rubber bearing to bi-directional earthquake motion which incorporates the interaction between the restoring forces of the bearings in two orthogonal directions is presented.it is concluded that. The peak response of base isolated liquid storage tanks is not much influenced by the bi-directional interaction of restoring forces of Lead LRB.

This study aims to identify whether the shifting from Human resource management to strategic human resource management in the leading industries of Iran has passed its’ fundamental alteration. Statistical Population covers 45leading manufacturing organizations from three pioneer industries, comprising 1280 employees including, senior managers, and members of strategic committee, board of directors, department managers, line managers and staff experts. Sampling method is random and classified. 619 questionnaires out of totally 712 samples has returned (87% return rate). Research methodology is a descriptive survey in the field study. Results show that strategic human resource management in pioneer industries of Iran is not in a desirable status. It requires a foundation and intention to cultural, social and theoretical components so that concept of diversity from traditional human resource and staff management to strategic human resource management can be provided.

This study investigated skills acquisition in Chemistry education for youth empowerment. A descriptive survey design was adopted. The population of the study was made up of two thousand, one hundred and nine (2,109) senior secondary (III) Chemistry students in the 14 Government owed secondary schools in Obio-Akpor Local Government Area of Rivers State. The two hundred (200) senior secondary (111) Chemistry students used as sample were obtained from five schools with fairly equipped science laboratories that could sustain most of the practical prescribed in the senior secondary school chemistry curriculum. Purposive sampling was used to select the schools as well as one intact class in which all the students offer chemistry in each school. The instrument for data collection was a structured questionnaire of thirty-five (35) items divided in three sections (a , b and c) which elicited information on the extent of use, availability, usability and the influence of the innovative teaching methods that enhance skills acquisition in Chemistry. It also elicited information on the skills acquired by the Chemistry students. The instrument was validated by 2 experts in science education (one biology and Chemistry options), as well as an expert in test and measurement.. A reliability coefficient of 0.76 was obtained using a test-retest method to obtain data and Pearson Product Moment correlation statistics.. In order to make decisions, a mean reference of 2.5 on a Modified 4 points Likert Scale was used. The result showed that students learnt better and acquired scientific skills when the teaching methods allowed active participation and interaction with the learning materials (hands on Activities). The result also revealed that students were able to acquire acquisitive and communicative skills. Sequel to the findings, the study recommended that the teaching-learning interaction in chemistry should be activity-oriented for the development of skills useful for enhancing productivity.

The research was conducted to identify types of aquatic macrophytes that grow in and around reservoirs, their uses, and the impacts of the macrophytes on fishing communities at Bontanga, Golinga, and Libga reservoirs, the Buipela dam, and the Black Volta at Buipe in the Northern Region of Ghana. The principal methods were ocular observation, photography and semi-structured interviews using questionnaires. The predominant macrophytes identified and their uses were: Vossia cuspidata, Elodea canadensis, and Echinochloa stagnina used as fodder for livestock; shoots of Ipomea aquatica, Panicum hemitomon, and Phragmites karka were used as roofing material, and for making hats, mats and necklaces; Nymphoid indica, Nympheae lotus, Elodea canadensis, Alternanthera sessilis, Pistia stratiotes and Hydrocharitaceae spp were being used to treat stomach ulcer, rheumatism, malaria, flu and boils; Ludwgia stolonifera and Ludwigia peploids were used as feed and as food for human consumption. Eichhornia natan and Triglochin dubia were identified without any known uses. It was also observed that the macrophytes impeded fishing operation at the study areas by entangling the fishing net of the fishermen. Exploding masses of macrophytes such as Ludwgia stolonifera were observed to redirect paddling, making fishing operation tedious. Nevertheless, some of the macrophytes were being used as bait to catch fish and as soap (Ludwigia peploid) to wash fishing gears. Sustainable use of the reservoirs require active mechanical, chemical, biological, or integrated control methods and the commercial exploitation of the macrophytes for production of useful products in local industries.