Efficient Performance and Lower Complexity of Error Control Schemes for WPAN Bluetooth Networks, Journal of Telecommunications and Information Technology, 2014, nr 4

This paper presents a new technique of reduction retransmission time by decreasing the discarded packets and combating the complexity through error control techniques. The work is based on Bluetooth, one of the most common Wireless Personal Area Network. Its early versions employ an expurgated Hamming code for error correction. In this paper, a new packet format using different error correction coding scheme and new formats for the EDR Bluetooth packets are presented. A study for the Packet Error Probability of classic and Enhanced Data Rate (EDR) packets is also presented to indicate the performance. The simulation experiments are performed over Additive White Gaussian Noise (AWGN) and Rayleigh flat-fading channels. The experimental results reveal that the proposed coding scheme for EDR packets enhances the power efficiency of the Bluetooth system and reduce the losses of EDR packets

EFFECT OF SUGAR BEET MOLASSES AND Fe-EDHHA ON TOMATO PLANTS GROWN UNDER SALINE WATER IRRIGATION CONDITION

Salinity is a major limiting factor for tomato crop growth and productivity especially in arid and semi arid lands region. Therefore this study was conducted to study the effect of applying sugar beet molasses, priming tomato seedling in saline water and Fe-EDHHA on mitigating salinity negative effects on tomato (Lycopersicon esculentum L.)  hybrid super strain B (salinity sensitive hybrid). Seedlings of tomato hybrid were transplanted on April 4th in both seasons 2014 and 2015 in pots contains washed sandy soil, and irrigated with saline water with EC of  2000, 3000 and 4000 ppm. Beet molasses and Fe – EDHHA were applied at  rates of 200 and 300 kg / fed. for beet molasses and 3 and 4 kg / fed. for Fe – EDHHA. Priming tomato seedlings in saline water treatment was applied at 5 and 6 dS/m for 24 hours.  Data showed that all plant growth aspects such as plant height, leaf area, plant fresh and dry weights were improved under beet molasses, Fe and priming tomato seedlings in saline water treatments compared to none treated plants (control). Yield parameters also followed the same trend. Among treatments, beet molasses at a rate of 200 kg / fed. recorded the highest significant effect in mitigating salinity negative effects. It could be concluded that beet molasses, priming tomato seedling in saline water and Fe – EDHHA treatments were more effective and efficient in mitigating salinity stress on tomato plants

SVD Audio Watermarking: A Tool to Enhance the Security of Image Transmission over ZigBee Networks, Journal of Telecommunications and Information Technology, 2011, nr 4

The security is important issue in wireless networks. This paper discusses audio watermarking as a tool to improve the security of image communication over the IEEE 802.15.4 ZigBee network. The adopted watermarking method implements the Singular-Value Decomposition (SVD) mathematical technique. This method is based on embedding a chaotic encrypted image in the Singular Values (SVs) of the audio signal after transforming it into a 2-D format. The objective of chaotic encryption is to enhance the level of security and resist different attacks. Experimental results show that the SVD audio watermarking method maintains the high quality of the audio signals and that the watermark extraction and decryption are possible even in the presence of attacks over the ZigBee network

Optimal design of water treatment processes

Predicted water shortages assign water treatment a leading role in improving water resources management. One of the main challenges associated with the processes remains early stage design of techno-economically optimised purification. This work addresses the current gap by undertaking a whole-system approach of flowsheet synthesis for the production of water at desired purity at minimum overall cost. The optimisation problem was formulated as a mixed-integer non-linear programming model. Two case studies were presented which incorporated the most common commercial technologies and the major pollution indicators, such as chemical oxygen demand, dissolved organic carbon, total suspended solids and total dissolved solids. The results were analysed and compared to existing guidelines in order to examine the applicability of the proposed approach

Prognostic model to predict postoperative acute kidney injury in patients undergoing major gastrointestinal surgery based on a national prospective observational cohort study.

Background: Acute illness, existing co-morbidities and surgical stress response can all contribute to postoperative acute kidney injury (AKI) in patients undergoing major gastrointestinal surgery. The aim of this study was prospectively to develop a pragmatic prognostic model to stratify patients according to risk of developing AKI after major gastrointestinal surgery. Methods: This prospective multicentre cohort study included consecutive adults undergoing elective or emergency gastrointestinal resection, liver resection or stoma reversal in 2-week blocks over a continuous 3-month period. The primary outcome was the rate of AKI within 7 days of surgery. Bootstrap stability was used to select clinically plausible risk factors into the model. Internal model validation was carried out by bootstrap validation. Results: A total of 4544 patients were included across 173 centres in the UK and Ireland. The overall rate of AKI was 14·2 per cent (646 of 4544) and the 30-day mortality rate was 1·8 per cent (84 of 4544). Stage 1 AKI was significantly associated with 30-day mortality (unadjusted odds ratio 7·61, 95 per cent c.i. 4·49 to 12·90; P < 0·001), with increasing odds of death with each AKI stage. Six variables were selected for inclusion in the prognostic model: age, sex, ASA grade, preoperative estimated glomerular filtration rate, planned open surgery and preoperative use of either an angiotensin-converting enzyme inhibitor or an angiotensin receptor blocker. Internal validation demonstrated good model discrimination (c-statistic 0·65). Discussion: Following major gastrointestinal surgery, AKI occurred in one in seven patients. This preoperative prognostic model identified patients at high risk of postoperative AKI. Validation in an independent data set is required to ensure generalizability

Efficient Performance and Lower Complexity of Error Control Schemes for WPAN Bluetooth Networks

This paper presents a new technique of reduction retransmission time by decreasing the discarded packets and combating the complexity through error control techniques. The work is based on Bluetooth, one of the most common Wireless Personal Area Network. Its early versions employ an expurgated Hamming code for error correction. In this paper, a new packet format using different error correction coding scheme and new formats for the EDR Bluetooth packets are presented. A study for the Packet Error Probability of classic and Enhanced Data Rate (EDR) packets is also presented to indicate the performance. The simulation experiments are performed over Additive White Gaussian Noise (AWGN) and Rayleigh flat-fading channels. The experimental results reveal that the proposed coding scheme for EDR packets enhances the power efficiency of the Bluetooth system and reduce the losses of EDR packets

صخور أساس البان - أفريقي بمنطقه شرق صحارى الدرع الافريقي

Bir Safsaf area occurs at the extreme southern part of the Western Desert of Egypt. It is covered by the Pan African Basement represented by the old continental gneisses and migmatites comprising granitic, granodioritic and tonalitic varieties, hornblende metagabbros with quartz-bearing varieties of tholeiitic nature formed in a continental environment at plate margrin. Grey Older Granites include quartz diorite, Tonalite and granodiorite are metalumnious and subduction related. Pink-red Younger Granites have essentially syenogranite, and monzogranite with subordinate quartz monzonite and monzodiorite varieties are metaluminous to Peraluminous and crustal-related. The both Older and Younger Granites are characterized by the most features of I-type granites and are formed through partial melting of the lower crust or upper mantle.صخور أساس البان - أفريقي بمنطقة شرق صحارى الدرع الافريقي ممثلة بصخور منطقة بئر صفصف والتي تقع في أقصى الجزء الجنوبي من الصحراء الغربية المصرية وهي مغطاة بصخور النيس والميجماتيت القارية القديمة ذات التركيب الجرانيتي والجوانوديوريتي والتوناليتي وصخور الميتاجابرو الهورنبلندي مع بعض الميتاجابرو الحامل للكوارتز . وصخور الميتاجابرو هذه ذات أصل ثيوليتي تكونت في بيئة قارية عند الجزء الجانبي من اللوح القاري وصخور الجرانيت القديم ذو اللون الرمادي والممثل بالكوارتز ديوريت والتوناليت والجرانوبيوريت ذات خصائص جير قلوية متوسطة الالومينا وربما تكونت في بيئة غوص وانزلاق فوق نطاق بينوف بانصهار مواد الستاره مع أو بدون إضافات من صخور القشرة الأرضية . وصخور الجرانيت الحديث ذو اللون الوردي والأحمر والمتكون من السيانوجرانيت والمونزوجرانيت مع بعض الكوارتز مونزونيت والمونزوديوريت ذات الخصائص القلوية متوسطة إلى عالية الألومينا والتي تظهر معظم خصائص الجرانيت المنشق من أصل ناري والمتكون بالانصهار الجزئي لصخور القشرة الابتدائية السفلى والوشاح العلوي

Prevalence of thrombophilic gene polymorphisms (FVL G1691A and MTHFR C677T) in patients with myocardial infarction

Background: Inherited thrombophilia may be caused by mutations, polymorphisms in a variety of genes mainly involved in haemostatic pathways. Aim of the study, was to find the prevalence of thrombophilic gene factor V Leiden (FVL) and methylene tetrahydrofolate reductase (MTHFR) gene polymorphism in patients with myocardial infarction (MI), aiming at early diagnostic methods and guiding preventive procedures. Subjects and methods: This study was carried on 30 patients who survived their first MI as compared to 15 healthy volunteers. Patients and controls were subjected to history, physical examination. Factor VL G1691A and MTHFR C677T genotypes were determined by RT PCR. Results: The prevalence of heterozygous FVL GA genotype was significantly higher among MI patients as compared to the control group. The prevalence of mutant homozygous AA was significantly higher in MI patients as compared to control. The low risk cases had a higher frequency of GA genotype as compared to high risk cases. As regards MTHFR C677T gene polymorphism, the prevalence of heterozygous MTHFR C677T CT genotype showed significant increase in MI patients compared with the control group. The prevalence of mutant homozygous TT genotype was significantly higher in MI patients as compared to the control group. The low risk cases had a higher frequency of heterozygous MTHFR C677T CT genotype than high risk cases. To conclude: The prevalence of heterozygous (FVL G1691A) and MTHFR C677T gene polymorphisms was significantly increased in MI patients compared with the control group and these gene polymorphisms are probably risk factors for myocardial infarction among Egyptian cases especially if integrated with other environmental and genetic risk factors. We recommended screening high risk patients for this polymorphism and the use of specific thromboprophylaxis to prevent recurrent thrombotic disease