Archives-June... 

The demand for feldspar as a raw material for various industrial applications is continuously increasing. It is a valuable raw material in the manufacture of glass, ceramic, fillers, enamel frits and welding electrodes. Feldspar is abundant in the earth’s crust and is generally associated with other silicate, titanium and iron oxide minerals. The present paper aimed to reduce the iron oxide content from feldspar ore of Libya, as well as, to obtain an optimal grade of feldspar concentrate for industrial applications. It should be mentioned that this is the first time that Libyan feldspar ores subjected to upgrading studies. Dry and wet magnetic separation techniques followed by leaching processes were carried out, in order to decrease the iron contamination and increase the feldspar content. From a feed containing 2.48% Fe2O3 a non-magnetic concentrate of 0.28 % Fe2O3 with feldspar yield of 84.5 % was obtained at size fraction – 0.032 mm. Such concentrate contains about 21.05% Al2O3% and Na2O, K2O of 18.24% in comparison to 12.18% in the feldspar ore. Leaching process successfully reduced the iron oxide content up to 0.07 %. At the same time, the total contents of Na2O + K2O increased to about 16.73% in comparison to 12.18% in the original feldspar ore.

Uterine rupture and retroperitoneal hematomas are all associated with increased risk for hemorrhage at the time of delivery. Prior cesarean section and Obstetric trauma are significant risk factors for uterine rupture. Except for the most superficial tears, these situations require surgical repair to restore proper anatomical appearance and to limit blood loss. Subtotal hysterectomy is commun. Management of retroperitoneal Hematoma depends on the clinical situation. It can be managed conservatively, surgically, or through use of angiographic embolization. We report a case of a 28 years old woman who presents a uterine rupture complicated with retroperitoneal hematoma after vaginal delivery.

In order to save the energy and provide the humanized hint and operation of vending machine, we design the function and application combing with solar energy and light emitting diode (LED) screen, the vending machine updated the intelligent device system to data query and the alarm hints to sound. The theoretical analysis and practical results implies that it is feasible to provide better service for client by the intelligent device system.

Caryl Churchill’s remarkable dramatic achievements have marked her as a post-modernist who has procured a revolution in contemporary theatre by creating a particular language to communicate the plight of women in Western societies. Semiologically, critics believe, she has created a unique sign system through which she represents crucial social and political issues at the same time that, along with her revolutionary techniques and views, she benefits from her predecessors in drama. One of her famous Feministic achievements is her play Vinegar Tom in which Churchill vehemently criticizes unjust treatment of women throughout the patriarchal history of man. In this play, she displays her outstanding novel techniques of writer- director-actor cooperation, use of songs and special use of time, the methods which are going to be elaborated in this study.

This paper presents the solution to the problem of grid voltage instability during occurrence of fault, on a system connected with wind turbine - driven doubly-fed induction generator (DFIG) which supplies alternating current (AC) power to the utility grid. Here, two pulse width modulated voltage source converters are connected back to back between the rotor terminals and utility grid via common direct current (DC) link. The grid side converter controls the power flow between the DC bus and the AC side. It allows the system to be operated in sub-synchronous and super synchronous mode of operation. The rotor excitation is provided by the machine side converter. The model makes use of d-q rotor reference frame using dynamic vector approach for machine model. The controller was implemented by the orientation of the generator stator flux vector along a synchronous reference axis. In this way, constant voltage and frequency was obtained and the generator would supply the active and reactive power demanded for the voltage correction by the load, while the wind turbine will be responsible for achieving power balance in the system. The system is modelled and simulated in the Matlab Simulink environment in such a way that it can be suited for modelling of all types of induction generator configurations. The results of the simulations show that DFIG wind turbines improved the voltage stability of the system through its ability to control reactive power and decouple control of active and reactive power by independently controlling the rotor excitation current especially during fault.

Studies were undertaken on the zooplankton communities of the Androth Island. Major planktonic groups were copepods, decapods, amphipods, chaetognaths, mysids, fish eggs and larvae. Besides these foraminiferans, ciliates, cladocerans, ostracods, polychaete larvae, gastopod larvae, crustacean larvae and echinoderm larvae were also encountered during the present study. Copepoda was found to be the most abundant group. The study provides baseline information on the Zooplankton community structure, which could give new insight to the future ecological assessment of Androth waters.

The banking industry has undergone a sea change after the first phase of economic liberalization in 1991 and hence credit management. While the primary function of banks is to lend funds as loans to various sectors such as agriculture, industry, personal loans, housing loans etc., in recent times the banks have become very cautious in extending loans. The reason being mounting non-performing assets (NPAs). NPA account not only reduces profitability of banks by provisioning in the profit and loss account, but their carrying cost is also increased which results in excess & avoidable management attention. Apart from this, a high level of NPA also puts strain on a banks net worth because banks are under pressure to maintain a desired level of Capital Adequacy and in the absence of comfortable to assess the health of various categories of loan assets in various categories of banks.

This research work is nominated for an image protection technique in the area of spatial domain based digital watermarking and steganography. The proposed work has evolved a hybrid algorithm, Namely, MP-1. In this paper, a new data hiding and digital watermarking algorithm basedonimage matrix vectorization is provided. Experimental results show that the research work has achievedfew of targeted goal such as good concealment ability, large embedding capacity. The proposed algorithm can be widely used in area of spatial domain based digital watermarking and steganography.

The association between atrial fibrillation and left atrial thrombus had been widely described; on the contrary, the relation between atrial fibrillation and right atrial thrombus hasn’t been demonstrated. We always thought that right atrial thrombus originated from deep venous thrombosis and named as “emboli in transit”. We report the case of a 91 year-old male patient, presenting with a permanent atrial fibrillation, his echocardiography showed a huge floating right atrial thrombus complicated with a bilateral pulmonary embolism. Our aim is to demonstrate through this case the association between atrial fibrillation and right atrial thrombus, using our findings in the literature, and comparing between the prevalence of right and left atrial thrombi in association with atrial fibrillation, explaining the difference between the both, and discussing therapeutic options.

In the latest development of Orthogonal Frequency Division Multiplexing (OFDM) communication system, the system performance can be distracted by the frequency offsets (FOs) which can demolish the orthogonality of the subcarriers, and hence leads to a number of impairments in the received signal, thereby making its detection incorrect. In this paper, a new threshold-based frequency offset estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems is proposed. Through a detailed analysis and simulation over AWGN channel, it has been shown that the proposed method shows good performance i.e. it offers low error variance as the SNR (signal to noise ratio) increases.