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Search Results: 1 - 10 of 447 matches for " Jalal Hassanzadeasl "
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Common Fixed Point Theorems for - -Contractive Type Mappings
Jalal Hassanzadeasl
International Journal of Analysis , 2013, DOI: 10.1155/2013/654659
Abstract: Recently, Samet et al. (2012) introduced the notion of - -contractive type mappings. They established some fixed point theorems for these mappings in complete metric spaces. In this paper, we introduce the notion of a coupled - -contractive mapping and give a common fixed point result about the mapping. Also, we give a result of common fixed points of some coupled self-maps on complete metric spaces satisfying a contractive condition. 1. Introduction We know fixed point theory has many applications and was extended by several authors from different views (see, e.g., [1–33]). Recently, Samet et al. introduced the notion of - -contractive type mappings [3]. Denote with the family of nondecreasing functions such that for all , where is the th iterate of . It is known that for all and [3]. Let be a metric space, a self map on , and . Then, is called a - -contractive mapping whenever for all . Also, we say that is -admissible whenever implies for all [3]. Also, we say that has the property ( ) if is a sequence in such that for all and , then for all . Let be a complete metric space and let a -admissible - -contractive mapping on . Suppose that there exists such that . If is continuous or has the property ( ), then has a fixed point (see [3]; Theorems 2.1 and 2.2). Finally, we say that has the property ( ) whenever for each there exists such that and . If has the property ( ) in the Theorems??2.1 and 2.2, then has a unique fixed point ([3]; Theorem 2.3). It is considerable that the results of Samet et al. generalize similar ordered results in the literature (see the results of the third section [3]). The aim of this paper is introducing the notion of generalized coupled - -contractive mappings and give a common fixed point result about the mappings. Definition 1. Let?? ??the family of functions satisfy:(i) and for all ;(ii) is continuous;(iii) is nondecreasing on ;(iv) for all . Definition 2. Let the family of functions satisfy is nondecreasing; , for all . These functions are known in the literature as ( )-comparison functions. It is easily proved that if is a ( )-comparison function, then for all . Definition 3. Let be a metric space, and let with given coupled mappings. Let , , , and let for all coupled mappings and . One says that ,?? are generalized coupled -contractive mappings whenever for all . Definition 4. Let , and let . One says that ,?? are coupled -admissible if for all . Definition 5. Let be a compete metric space. For two subsets ,?? of , one marks , if for all , there exists such that . Definition 6. A partial metric on a nonempty set is a
On the Zeros of Daubechies Orthogonal and Biorthogonal Wavelets  [PDF]
Jalal Karam
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.37116
Abstract: In the last decade, Daubechies’ wavelets have been successfully used in many signal processing paradigms. The construction of these wavelets via two channel perfect reconstruction filter bank requires the identification of necessary conditions that the coefficients of the filters and the roots of binomial polynomials associated with them should exhibit. In this paper, orthogonal and Biorthogonal Daubechies families of wavelets are considered and their filters are derived. In particular, the Biorthogonal wavelets Bior3.5, Bior3.9 and Bior6.8 are examined and the zeros distribution of their polynomials associated filters are located. We also examine the locations of these zeros of the filters associated with the two orthogonal wavelets db6 and db8.
Peculiarities of CO2 exchange in soybean genotypes contrasting in grain yield  [PDF]
Jalal A. Aliyev
Advances in Biological Chemistry (ABC) , 2012, DOI: 10.4236/abc.2012.23039
Abstract: The peculiarities of leaf carbon dioxide gas exchange in soybean genotypes grown in field over a large area and contrasting in duration of vegetation, photosynthetic traits and productivity were studied. Varietal differences in the daily and ontogenetic changes in photosynthesis and photorespiration were identified. It was established that the period of the high activity of photosynthetic apparatus in high productive soybean genotypes lasts for a longer time. The photosynthetic rate and the rate of CO2 release in light due to photorespiration are higher in high productive genotypes. A value of photorespiration in contrasting soybean genotypes constitutes about 28% - 35% of photosynthetic rate. The ratio of gross photosynthesis to photorespiration in genotypes with different productivity is constant enough during ontogenesis, indicating a direct positive correlation between gross photosynthesis and photorespiration. Therefore, contrary to conception arisen during many years on the waste-fulness of photorespiration, taking into account the versatile investigations on different aspects of photo-respiration, it was proved that photorespiration is one of the evolutionarily developed vital metabolic processes in plants and the attempts to reduce this process with the purpose of increasing the crop productivity are inconsistent.
CSF Leakage "Radiology, Neuroradiology and Head and Neck, ENT"
Jalal Jalal Shokouhi
Iranian Journal of Radiology , 2009,
Abstract: Introduction: Leak of CSF is a relatively common complication in skull base fractures and it is rarely seen during skull base tumors and pituitary gland pathologies "Adenomas and empty sellae syndrome"."nThe common site of CSF leakage is related to the site of fracture but it is more common in cribriform plate fractures. Other sites are frontal sinus fractures and rarely sphenoid sinus lesions related to pituitary gland site pathology. Evaluation of the cribriform plate and the posterior wall of the frontal sinus is an imaging key point."nOther rare conditions of CSF leak are related to temporal bone fractures leading to otorrhea and in a paradoxical feature with rhinorrhea "intact tympanic membrane with temporal bone fracture and eustachian tube transmission of fluid"."nEthiology "nTrauma and skull base fractures epecially in the cribriform plate."nParanasal sinus fractures specially in the frontal and sphenoidal sinuses."nTemporal bone fractures."nEmpty sellae and intrasellar tumors."nPost-op stage in the skull base tumors."nDiagnosis"nNasal CSF leakage laboratory."nRadioneucleid imaging: This way is sensitive but non-specific."nMethylen blue injection into CSF via lumbar puncture "non-specific" and rarely used."nHigh resolution axial, coronal and sagittal reconstructed images of skull base as a modality of choice"nIn case of positive CSF leak but negative spiral ultra-high resolution CT in PNS, ethmoidal region and cribriform plate also temporal bone cuts we need linear and pleuridirectional X-ray tomography."nIn case of positive CSF leakage and negative radiology and imaging it needs exploration surgery to direct vision of anterior fossa floor bones for fracture."n-Companion complication could be recurrent meningitis."n- No 3D-CT or MRI is necessary for bone fractures but MRI could be"nnecessary for related brain contusion or soft tissue lesions and tumor."nX-ray CT-cisternography"nAlthough more than 90% of fractures could be detected by multidirectional ultra-high resolution bone CT of the skull base, CT-cisternography is used to show the CSF leak point and CSF reservoir in sinuses or ethmoidal cells."n- In our experiments all positive cases diagnosed by CT-cisternography were detected by UHRCT of the bone and no positive cisternography was detected after negative plain UHRCT."nCoronal UHRCT is the more important and sensitive method mode for the diagnosis of the leak point."nInjection of 15cc non-ionic contrast media like ultravist 300 into CSF via lumbar puncture increases about 100-110 hounsfield units density of leaked CSF via active leak point
Brain Tumors and Neurosurgeon Neuroradiologist Relations
Jalal Jalal Shokouhi
Iranian Journal of Radiology , 2009,
Abstract: "nToday the modality of choice for brain tumors is MRI with and without GD. "nGD injection needs during to stage T1, before injection and after injection for image subtracts to see the enhancement degree, detecting crystallized calcification, colloid and fat material also methemoglubin inside the tumor. "n- In case of thin layer seeding, GD MRI could be positive but T2 and FLAIR images could be negative "no mass effect". "n- For meningiomas if you do not want to inject contrast media please request plain CT SCAN that is stronger than non-contrasted MRI but GD MRI is the choice and better than both. "n- For small or micro-vestibular schwannoma do not request CT please request MRI with GD. "n- In craniopharyngioma request non-contrast CT with combination of MRI with and without GD. "n- For micro-adenoma request dynamic MRI "better than Dynamic CT" "n- please do not use axial CT and non-contrasted coronal CT for micro-adenoma". "n- Few infiltrative non-enhancing tumors need serial MRI to be differentiated from CVA. "n- For differentiation of tumor recurrency from radiotherapy necrosis MRS is necessary. "nOther lecture notes will be discussed in the round table.
Medical and Radiological Economy
Jalal Jalal Shokouhi
Iranian Journal of Radiology , 2009,
Abstract: Economy ride ahead of the world. "nAll human activities lead to financial problems. "nEconomy has two dimensions in usual daily commercial problems but medical and radiological economy is a tridimensional phenomenon. "nIn the two-dimensional economy, both sides, see their own benefits and fair "gains" but in the medical and radiologic economy, the patient gives us money and gets health. We protect the patient’s benefits by controlling the complications and consequently his/her future. This means we are not looking for our benefits only. "n19% of WHO payments are by private insurance companies, 25% by social insurance companies, 18% out of packet or with no payment, 34% by governments and 4% by others. "nIn undeveloped countries 20-25% of health payments are dedicated for 1% of the people, 60%of the payment for 10% of the people and 20% for the other 89% of the nation. Today most of our people are young but after 3-4 decades our people or the Iranian society turns into a gray category or old population. "nPercentage increase in health budget from 1960 to1997 was 12% in Japan, 10% in Germany, 9.5% in France, 9.4% in the USA, 8.5% in Canada, 8.2% in England and 7.5% in Newzealand. "nThe number of physicians for 1000 population is 3.4 in Germany, 2.9 in France, 2.6 in the USA, 2.1 in Canada, 1.8 in Japan and 1.7 in the UK. "nHospital beds for 1000 population in year 2003 was minimum 3.1 in Finland and maximum 12.3 in Japan. "nBy 1996: Number of X-ray CT scan for 1000.000 population is 69.7 in Japan, 26.9 in USA, 18.4 in Australia, 16.04 in Germany,9.4 in France, 7.9 in Canada and 6.3 in England. "nFrom 1995 to 1996: Number of MRI for 1000.000 population is 18.8 in Japan, 16 in the USA, 5.7 in Germany, 3.4 in the UK, 2.9 in Australia, 2.3 in France and 1.3 in Canada. "nFee for service is very low in our country and any investment or business is better than medical investment, especially radiology investment. "nPrescriptions for the future in developed countries or future humanity are: "nComputerized physician order entry "nEstablishing and increasing document imaging "nIndividual health registry "nSale systems should be clear and useful "nNational and innovation roles for patients "nUsing information and information technology "I.T" for balance and increase quality of health. "nUsing bar codes in the health system.
Development of Deterministic Thinking Scale Based on Iranian Culture  [PDF]
Jalal Younesi, Akram Alsadat Mirafzal
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.411116
Abstract:

One of major cognitive distortions is deterministic thinking. This type of thinking ignores any possibility or probability in conclusion about the events. Any consequence of event may be thought such as: 2 × 2 = 4. Equality is a dominant factor among all conclusions of this kind of distortion. In Islamic perspective, the distortion is seen as a destructive factor for ruining balance of fear and hope, which is to be an important sign of people’s faith. The distortion emerges in cognitive rigidity in the mind which may be mother of all distortions. Cognitive rigidity is a main reason for depression and other psychosocial maladjustment. The scale with 36 items was developed in first phase of this study. Its validity and reliability were measured among men and women. It had reasonable and significant correlation with Beck Depression Inventory (p ≤ .05) and also showed reasonable internal reliability (α = .8218). Through factor analysis, five factors appeared in this type of thinking to be related to General deterministic thinking, Deterministic thinking in interaction with people, Absolute view in thinking, Deterministic thinking in prediction of future and Deterministic thinking in negative events.

The Need to Establish a Common Base Line for the Characteristics of Safety Withdrawal of Prescription Drugs from Worldwide Pharmaceutical Markets
Jalal Pourahmad
Iranian Journal of Pharmaceutical Research , 2008,
Abstract:
History of Medical Sciences in Iran
Jalal Pourahmad
Iranian Journal of Pharmaceutical Research , 2008,
Abstract: The practice and study of medicine in Persia has a long and prolific history. The ancient Iranian medicine was combined by different medical traditions from Mesopotamia, Egypt, India, China and Greece for more than 4000 years and merged to form what became the nucleus and foundation of medical practice in the European countries in the 13th century. The Iranian academic centers like Jundishapur University (3rd century AD) were a breeding ground for the union among great scientists from different civilizations. These centers successfully followed their predecessors’ theories and greatly extended their scientific research through history. Iranian physicians during the glorious Islamic civilization had a tremendous share in the progress of medical sciences. The excellent clinical observations and physical examinations and writings of Iranian scientists such as Rhazes (Al-Razi, 865-925 AD), Haly Abbas (Ali ibn-al Abbas-al Majusi, died 994 AD), Avicenna (Abou Ali Sina, 980-1037) and Jurjan (Osmail ibn al-Husayn al-Jurjani, 110 AD) influenced all fields of medicine The new era of medicine in Iran begins with establishment of Dar-ul-funoon in 1851, which was the only center for modern medical education before the establishment of Tehran University. Following the establishment of the Tehran university school of medicine in 1934 and the return of Iranian graduates from the medical schools in Europe, much progress was made in the development and availability of trained manpower and specialized faculties in medicine. After the Islamic revolution by the growing spirit of independence inspired by the Iranian government the number of medical schools and medical students increased more than 10 times. For the 1st time in recent modern history the Iranian medical universities started to offer post-graduate specialized degrees in basic, clinical and engineering sciences.
Identification of Intracellular Sources Responsible for Endogenous Reactive Oxygen Species Formation
Jalal Pourahmad
Iranian Journal of Pharmaceutical Research , 2002,
Abstract: The endogenous reactive oxygen species ( ROS ) formation is associated with many pathologic states such as inflammatory diseases, neurodegenerative diseases, brain and heart ischemic injuries, cancer, and aging. The purpose of this study was to investigate the endogenous sources for ROS formation in intact isolated rat hepatocytes, in particular, peroxisomal oxidases, monoamine oxidase, xanthine oxidase, cytochrome P450, and mitochondria electron transport. The rat hepatocyte cat alyzed oxidation of 2’,7’- dichlorofluorescin to form the fluorescent 2,7’-dichlorofluorescein was used to measure endogenous and xenobiotic-induced reactive oxygen speci es ( ROS ) formation by intactisolated rat hepatocytes. Various oxidase substrates and inhibitors were then used to identify the intracellular oxidases responsible. Endogenous ROS formation was markedly increased in catalase inhibited or GSH depleted hepatocytes, and was inhibited by ROS scavengers or des feroxamine. Endogenous ROS formation was also inhibited by cytochrome P450 inhibitors, but was not affected by oxypurinol, a xanthine oxidase inhibitor. Mitochondrial respiratory chain inhibitors or hypoxia, on the other hand, markedly increased ROS before cytotoxicity ensued. This suggests endogenous ROS formation can largely be attributed to oxygen reduction by reduced mitochondrial el ectron transport components and reducedcytochrome P450 isozymes. Addition of monoamine oxidase substrat es increased antimycin Aresistant respiration and ROS formation before cytotoxicity ensued. On the other hand peroxisomal substrates readily induced ROS formation and were cytotoxic towards catalaseinhibited hepatocytes, which suggests that peroxisomal catalase removes endogenous H2O2 formed in the peroxisomes. The consequences of upregulation of peroxisomal oxidases are discussed.
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