The Study of Carbon Nano-particles (CNPs) & Film Thickness & Temperature Effect on the Electrical Properties of Poly (3-hexylthiophene-2,5-diyl)

A thin films of a neat and a doped of P3HT in (1%, 2%, 3%, 4%, 5%) CNPs concentrations were fabricated by a spin coating method in multi revolution speeds (1000, 1500, 2000, 2500, 3000)rpm on glass substrate for thin film thickness measurement, and other films were fabricated on aluminum interdigitated finger electrodes of ceramic substrates for I-V characteristics measurement. The film thickness of the fabricated thin films of neat and doped P3HT was found in direct proportional to CNPs concentration in every revolution speed, and in reciprocal proportional to the revolution speed for every CNPs concentration. I-V characteristics were measured at (303, 313, 323, 333, 343)ᴼK temperature for all thin films in the voltage range to equal or less than (10 V), which presents an ohmic behavior of all samples. The surface electrical conductivity (σs) of samples was calculated from a slope of ohmic lines, the results shows an electrical semiconductor behavior for all neat and doped P3HT deposited films. On the other hand, an increasing of a surface conductivity of samples with an increase of CNPs doping concentration from (0%) to (5%) in every temperature and revolution speed. Its observed from the results that the electrical conductivity was decreased with film thickness increasing for neat and doped P3HT films in any one of temperature range. An activation energy (Ea) of the fabricated thin films was calculated from the slope of linear relation between conductivity an inverse of temperature, its observed that the activation energy decreasing for doped case P3HT in comparison with neat polymer, and its decreasing with an increase of the CNPs doping ratio. Also its clear that activation energy, increasing with increasing film thickness of the neat and doped P3HT

Extracting Object Oriented Software Architecture from C++ Source Code

Software architecture strongly influences the ability to satisfy quality attributes such as modifiability, performance, and security. It is important to be able to analyse and extract information about that architecture. However, architectural documentation frequently does not exist, and when it does, it is often out of sync with the implemented system. In addition, it is not all that software development begins with a clean slate; systems are almost always constrained by the existing legacy code. As a consequence, there is a need to extract information from existing system implementations and reason architecturally about this information. This research presents a reverse engineering tool VOO++ that will read an Object- Oriented C++ source code using UML notation in order to visualise its Class structure and the various relationships that may exist including, inheritance, aggregation, and dependency relationships based on the modified Cohen-Sutherland clipping algorithm. The idea of clipping is reversed, instead of clipping inside the rectangle, the clipping is done out side the rectangle in terms of four directions (left, right, top, and bottom) and two points represent the centre point for each rectangle. An Object-Oriented approach is used to design and implement the tool. Reverse engineering, design pattern, and graphics are the underlying techniques supplied. VOO++ aids an analyst in extracting, manipulating and interpreting the Object-Oriented static model information. By assisting in the reconstruction of static architectures from extracted information, VOO++ helps an analyst to redocument and understand architectures and discover the relationship between "as-implemented" and "asdesigned" architectures

The impact of visual-verbal relationships on native-nonnative english speakers' reading processes and comprehension

The aim of this study was to comparatively investigate the impact of visual-verbal relationships that exist in expository texts on the reading process and comprehension of readers from different language background: native speakers of English (LI) and speakers of English as a foreign language (EFL). The study focussed, in this respect, on the visual elements (VEs) mainly graphs and tables that accompanied the selected texts. Two major experiments were undertaken. The first, was for the reading process using the post-reading questionnaire technique. Participants were 163 adult readers representing three groups: 77 (LI), 56 (EFL postgraduates); and 30 (EFL undergraduates). The second experiment was for the reading comprehension using cloze procedure. Participants were 123 representing the same above gorups: 50, 33 and 40 respectively. It was hypothesised that the LI readers would make use of VEs in the reading process in ways different from both EFL groups and that use would enhance each group's comprehension in different aspects and to different levels. In the analysis of the data of both experiments two statistical measurements were used. The chi-square was used to measure the differences between frequencies and the t-test was used to measure the differences between means. The results indicated a significant relationship between readers' language background and the impact of visual-verbal relationships on their reading processes and comprehension of such type of texts. The results also revealed considerable similarities between the two EFL groups in the reading process of texts accompanied by VEs. In the reading comprehension, however, the EFL undergraduates seemed to benefit from the visual-verbal relationships in their comprehension more than the postgraduates, suggesting a weak relationship of this impact for older EFL readers. Furthermore, the results showed considerable similarities between the reading process of texts accompanied by VEs and of whole prose texts. Finally an evaluation of this study was undertaken as well as practical implications for EFL readers and suggestions for future research

Prevalence of Neurological Manifestations of Lung Cancer among Adult Sudanese Patients

The objective: is to study the prevalence of neurological manifestations among adults Sudanese patients with lung cancer seen in the Radiation and Isotope Centre in Khartoum.Methods: This is a prospective cross sectional hospital based study, conducted at Radiation and Isotope Centre in Khartoum. Sample of 52 adults Sudanese patients with lung cancer were included in the study. The period of the study was from February 2006 to July 2006. Data were collected by self administered questionnaire; this was constructed in sections to address the different aspects of the study as follows: personal data, presentation, physical examination, and investigations.The results: showed that 41 patients were males. Most of the patients were above 50 years of age. Fifty percent of our patients’ were from Khartoum state. All of our patients had chest findings except one. The most common symptoms observed were of cranial nerves involvement, headache, limb weakness, numbness, and sphincteric disturbance. More than half of the patients were smokers. Other extrapulmonary manifestations noticed include: clubbing, lymph node enlargement, bone metastasis or fracture, gynaecomastia, superior vena cava obstruction, hepatomegaly, and ascites. Chest X-ray abnormalities showed pleural effusion, consolidation, hilar lymphadenopthy, collapsed lung, and fibrosis in the majority of patients. Most of our patients had adenocarcinoma, followed by squamous cell carcinoma, poorly differentiated carcinoma, and small cell carcinoma.Conclusion: The common neurological manifestations of lung cancer were found to be cranial nerves palsies, followed by lower limbs weakness, numbness, and sphincteric disturbances.Key words: Cerebellar, numbness, neuropathy, convulsion

Laparoscopic Repair of Penetrating Injury of the Diaphragm: an Experience from a District Hospital

In this study we review our experience in using laparoscopy as a diagnostic and therapeutic tool in dealing with penetrating diaphragmatic injuries due to stab wounds and look at the feasibility of using this procedure in other similar institutions. Thirty patients, all of whom were males 20-30 years of age, presented to the surgical emergency unit of our hospital with upper abdominal and lower chest wall stab wounds between 01-05-1998 and 30-11-2006. Diagnosis of the diaphragm injury was either obvious with omentum herniating through the chest wall, or occult with confirmation of the injury at laparoscopy. All patients underwent diagnostic laparoscopy, which resulted in identification and efficient treatment of eight patients with diaphragmatic injury, and thereby laparotomy was avoided. The procedure converted to open surgery in one patient because of a small left-sided colonic tear. Laparoscopy is an efficient tool for the diagnosis and management of diaphragmatic injuries. It should be used routinely instead of exploratory laparotomy in haemodynamically stable patients with penetrating lower chest injuries

Symmetric Cryptosystem Based on Petri Net

يتضمن هذا البحث طريقة جديدة  تعتمد على شبكة بتري لتوليد مفتاح سري خاص .يستخدم  مؤشر الوصول الذي يشير الى البيانات الموجودة  في الشبكة كمفتاح للتشفير وفك التشفير للحصول على مفتاح معقد بشكل جيد. يستخدم كلا الطرفين (المرسل والمستقبل)  للتشفير وفك التشفيرشبكة ذات تصميم مطابق لتوليد نفس المفتاح . يتم اعادة ترتيب النص الصريح باستخدام جدول معين قبل عملية التجميع مع المفتاح لتوليد النص المشفرIn this wok, a novel approach based on ordinary Petri net is used to generate private key . The reachability marking  of petri net is used as encryption/decryption key to provide more complex key . The same ordinary Petri Nets models  are used for the sender(encryption) and  the receiver(decryption).The plaintext has been permutated  using  look-up table ,and XOR-ed with key to generate cipher tex

Reduced OoB Emission and PAPR Using Partial-OSLM technique in 5G UFMC Systems

Universal-filtered multi-carrier (UFMC) waveformis considered as a potential candidate for next generation wirelesssystems due to its robustness against inter-carrier interference(ICI) and the low latency required in 5G systems. In this paper, apulse shaping approaches in UFMC technique is studied to reducethe spectral leakage into nearby sub-bands. The performance ofvarious types of window functions such as Chebychev, Hamming,Hanning and Blackman with UFMC are compared. This leadsto different coefficients and attenuation shapes, that enabledto choose the proper window function. Finally, a new selectivemapping (SLM) peak to average power ratio (PAPR) reductiontechnique is proposed to enhance the UFMC system performance.Results show that the BER performance of UFMC with allwindows functions are the same. However, Blackman windowfunction has a higher attenuation for sidebands compared withothers

Number of sources estimation using a hybrid algorithm for smart antenna

The number of sources estimation is one of the vital key technologies in smart antenna. The current paper adopts a new system that employs a hybrid algorithm of artificial bee colony (ABC) and complex generalized Hebbian (CGHA) neural network to Bayesian information criterion (BIC) technique, aiming to enhance the accuracy of number of sources estimation. The advantage of the new system is that no need to compute the covariance matrix, since its principal eigenvalues are computed using the CGHA neural network for the received signals. Moreover, the proposed system can optimize the training condition of the CGHA neural network, therefore it can overcome the random selection of initial weights and learning rate, which evades network oscillation and trapping into local solution. Simulation results of the offered system show good responses through reducing the required time to train the CGHA neural network, fast converge speed, effectiveness, in addition to achieving the correct number of sources

Load Balance in Data Center SDN Networks

In the last two decades, networks had been changed according to the rapid changing in its requirements.  The current Data Center Networks have large number of hosts (tens or thousands) with special needs of bandwidth as the cloud network and the multimedia content computing is increased. The conventional Data Center Networks (DCNs) are highlighted by the increased number of users and bandwidth requirements which in turn have many implementation limitations.  The current networking devices with its control and forwarding planes coupling result in network architectures are not suitable for dynamic computing and storage needs.  Software Defined networking (SDN) is introduced to change this notion of traditional networks by decoupling control and forwarding planes. So, due to the rapid increase in the number of applications, websites, storage space, and some of the network resources are being underutilized due to static routing mechanisms. To overcome these limitations, a Software Defined Network based Openflow Data Center network architecture is used to obtain better performance parameters and implementing traffic load balancing function. The load balancing distributes the traffic requests over the connected servers, to diminish network congestions, and reduce underutilization problem of servers. As a result, SDN is developed to afford more effective configuration, enhanced performance, and more flexibility to deal with huge network design