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Search Results: 1 - 10 of 144418 matches for " Haghighat B "
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Relationship of serum magnesium level and supplemental magnesium dosage with post coronary artery bypass graft surgery arrhythmias
Najafi M,Haghighat B,Ahmadi H
Tehran University Medical Journal , 2007,
Abstract: Background: Atrial and ventricular arrhythmias are among the most common complications after coronary artery bypass graft (CABG) surgery. Previous studies demonstrated that cardiopulmonary bypass itself results in reduced serum magnesium levels. In this study, we evaluated the effect of total blood magnesium level (TMG) on the prevention of perioperative arrhythmias with routine regimens of 2-4 grams supplemental magnesium (SMG). Methods: TMG was measured in patients who were scheduled for CABG on three occasions: just before anesthesia, just after entering the intensive care unit (ICU) after completion of the sugery, and on the first morning after the operation. Patients were evaluated for primary cardiac rhythm and other variables that could have an influence on the magnesium level, including serum creatinine, urine output in the operating room and diuretic therapy. The SMG dosage was also recorded in the operating room and ICU. Patients were then evaluated for the rate and type of arrhythmia for the next three days. Results: The mean TMG levels in 174 cases were 2.2 (0.5), 2.6 (0.6) and 2.4 (0.6) mg/dl for the three occasions, respectively. The mean SMG was 2.5 (1.2) grams. Of 164 patients, 51 (31%) developed the following post-operative arrhythmias: AF (7.3%), non-AF SVA (15.2%) and ventricular (16.5%). The mean serum creatinine level and urine output were 1.2 mg/dl and 1800 ml, respectively. Although there was a significant difference between the TMG levels on the three different occasions (P<0.001), all values were within normal range. When we stratified the TMG levels of the patients based on administered SMG, the Mentel-Haenszel test revealed no significant difference between the first and third TMG (P=0.6). Although the TMG levels were higher in arrhythmic patients compared to those without arrhythmia (2.25 vs. 2.14 mg/dl), both values were within the normal range and there was no significant difference between the two groups. Serum creatinine levels and urine volume were not related to TMG levels. Conclusion: This study indicates that routine magnesium administration has no significant effect on SMG levels. Also, serum creatinine and urine output are not determinant factors for SMG administration. There was no correlation between TMG levels and perioperative arrhythmia. We conclude that the routine regimen of magnesium administration has no effect on the incidence of perioperative arrhythmia, though it is necessary for maintaining normal magnesium levels.
Quakonium spectroscopy by Klein-Gordon equation
M. Haghighat B Mirza,A. Dadkhah
Iranian Journal of Physics Research , 2000,
Abstract: A model is proposed to obtain the qq spectra by using a generalized Klein-Gordon equation for a two-body system. A variety of different potentials are coupled to the mass term of the generalized equation. The eigenvalues and the corresponding mass spectra are evaluated by using numerical and analytical methods. The resulting spectra match dosely with the experimental data. The obtained values are also compared with those of models such as quasipotential equation (QPE).
The Development of an Instrument to Measure Stigmatization: factor analysis and origin of stigmatization
Haghighat,Rahman;
The European Journal of Psychiatry , 2005, DOI: 10.4321/S0213-61632005000300002
Abstract: assessment of stigmatization and understanding of its roots are gaining more importance as its effect on the prognosis of mental health is recognized. a search with medline showed that there are instruments assessing stigmatization, most containing misconceptions, and regrettably none with adequate reliability and validity. to develop a reliable and valid instrument for research into stigmatization, and to define the structure of stigmatization by factor analysis of the results, about two thousand items from patients' own explanatory models, user groups' ideas, relatives' and social workers' accounts were scrutinized by the author and an independent observer. the items were simplified and rephrased so that they each contained a single idea expressed in clear language. items were excluded on the grounds of redundancy, culture-boundness or representing factual knowledge rather than attitude. the draft of the instrument was field-tested, and rigorous assessments proved its reliability and validity. factor analysis derived three factors indicating social, psychological and evolutionary foundations of stigmatization. the result is the standardized stigmatization questionnaire, version 1 (ssq1) which is now being used in several research centres in europe. the unitary theory of stigmatization resulting from this study has contributed to a new understanding of the meaning of stigmatization.
How Much Control Dose Central Bank of Iran over Money Supply?
Jafar HAGHIGHAT
Journal of Knowledge Management, Economics and Information Technology , 2011,
Abstract: In discussions about the efficacy of monetary policy instruments, attention is often focused on analyzing the money supply process. Monetarists, in general, argue that the monetary authorities can exercise effective control over the stock of money; others, especially those who share the new view of monetary theory argue that the determination of the stock of money is part of the economy. In this view, the stock of money is the outgrowth of the behavior of the public, the financial sector (banks), the finance ministry, andthe rest of the world as well as of the actions of the central bank. The paper investigated the co-integrating property and stability of the supply of money function in Iran. The paper employed the ARDL approach together with CUSUM and CUSUMSQ tests. The results show that M1 and M2 is cointegrated with net claims on the government, net foreign assets, and rate of profit on bank deposit (interest rate and a major implication of using interest rate elasticity estimates from M2 function is that money is endogenous.
The Development of an Instrument to Measure Stigmatization: factor analysis and origin of stigmatization
Rahman Haghighat
The European Journal of Psychiatry , 2005,
Abstract: Assessment of stigmatization and understanding of its roots are gaining more importance as its effect on the prognosis of mental health is recognized. A search with Medline showed that there are instruments assessing stigmatization, most containing misconceptions, and regrettably none with adequate reliability and validity. To develop a reliable and valid instrument for research into stigmatization, and to define the structure of stigmatization by factor analysis of the results, about two thousand items from patients' own explanatory models, user groups' ideas, relatives' and social workers' accounts were scrutinized by the author and an independent observer. The items were simplified and rephrased so that they each contained a single idea expressed in clear language. Items were excluded on the grounds of redundancy, culture-boundness or representing factual knowledge rather than attitude. The draft of the instrument was field-tested, and rigorous assessments proved its reliability and validity. Factor analysis derived three factors indicating social, psychological and evolutionary foundations of stigmatization. The result is the Standardized Stigmatization Questionnaire, version 1 (SSQ1) which is now being used in several research centres in Europe. The Unitary Theory of Stigmatization resulting from this study has contributed to a new understanding of the meaning of stigmatization.
Evaluation of the strategies of target market selection on the basis of IFE and EFE matrixes using linmap technique (A case study of Bushehr province)
Hamid Shahbandarzadeh,Fatemeh Haghighat
Iranian Journal of Management Studies , 2010,
Abstract: One of the most important requirements of developing appropriate strategies for internationalmarketing is correct identification of target markets. Using quantitative techniques and decisionmaking skills will lead to better results regarding the evaluation of marketing strategies. In thisstudy, first we have used internal factor evaluation (IFE) matrix for recognizing and comparingstrengths and weaknesses (internal factors) of Bushehr export companies regarding participation intheir target markets and then we have used external factor evaluation (EFE) matrix for recognizingand comparing opportunities and threats (external factors).As the effective criteria have been categorized in this four level (strengths, weaknesses,opportunities and threats), we have used LINMAP technique separately for each level and at lastwe've unified the results of each level by using of Borda method.The findings of this study help decision-makers of international trading to investigate the results oftheir decisions in a more logical and efficient way.
Semieptonic weak decay of B to D and D*
M. Haghighat,M. Momeni
Iranian Journal of Physics Research , 2003,
Abstract: In this paper we consider the Beth-Salpeter(BS) equation for the bound state of two piont particles with a confining kernal. Subsequently we obtain the heavy meson wave function in the framework of heavy quark effective theory assumptions. We calculate the semileptonic weak decay of B to D and D * using the BS wave function to give q2-dependence of the form factors. The obtained results for the from factors, their slopes and curvature are consistent with the experimental data.
g factor of the charged leptons in noncommutative spacetime
M Haghighat,N Mortazavi
Iranian Journal of Physics Research , 2011,
Abstract: The g-factor of the charged leptons has always been considered by many physicists, both experimentaly as well as theoretically. In fact the electron and muon g-factor play the main role in testing the QED as well as the standard model. Meanwhile, there is a discrepancy between the standard model prediction of the muon anomalies magnetic moment and its experimental determination as large as (25.5±8.0)×10-10.Therefore the g-factor can be used as the best place to study the new physics beyond the standard model. In this article, we consider the g-factor of the lepton in the noncommutative space time as a new physics model. In the ordinary theory, Schwinger evaluated the first correction to the g-factor of free electron, which arises from the electron interaction with photon at one loop level in the QED. In noncommutative space time, we show that at one loop, there is an NC-contribution to the g-factor of leptons which leads to a new bound on the noncommutative parameter (NC parameter). The obtained bounds are comparable with the current bounds on the NC-parameters of the order TeV.
Feynman rules in the Lorentz violating extension of the standard model
A Binandeh,M Haghighat
Iranian Journal of Physics Research , 2011,
Abstract: We consider the Lorentz violating extension of the standard model introduced by D. Colladay and V. A. Kostelecky. In this framework, we obtain all Feynman rules for the electroweak part of the standard model extension (SME), for the first time. Among the new obtained interactions one finds new vertices for the Higgs boson that is interesting in the phenomenology of the Higgs particle.
Bethe-Salpeter equation in non-commutative space
M. Haghighat,A. Ahmadian
Iranian Journal of Physics Research , 2005,
Abstract: We consider Bethe-Salpeter (BS) equation for the bound state of two point particles in the non-commutative space-time. We subsequently explore the BS equation for spin0-spin0, spin1/2-spin1/2 and spin0-spin1/2 bound states. we show that the lowest order spin independent correction to energy spectrum in each case is of the order θ a 4 while the spin dependent one in NC space, is started at the order θ a 6.
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