Approximate analysis of two-mass–spring systems and buckling of a column

AbstractMax–Min Approach (MMA) is applied to obtain an approximate solution of three practical cases in terms of a nonlinear oscillation system. After finding maximal and minimal solution thresholds of a nonlinear problem, an approximate solution of the nonlinear equation can be easily achieved using He Chengtian’s interpolation. Numerical results indicate the effectiveness of the proposed method both in respect of the whole range of involved parameters as well as the excellent agreement with the approximate frequencies and periodic solutions with the exact ones. It is predicted that MMA can be found widely applicable in engineering

Turbulence, combustion, pollutant, and stability characterization of a premixed, step combustor

A two dimensional combustion tunnel was constructed to study a lean premixed turbulent propane/air flame stablized behind a rearward facing step. Studied were: (1) the existence and importance of large coherent structures in turbulent reacting and nonreacting free shear layers behind the steps; (2) the effect of inlet temperature and reference velocity on combustion efficiency; (3) CO, NO2 and NO sub x production in the flame; and (4) the blowout and upstream propagation of the flame. In the ranges studied, the large coherent structures dominated both the reacting and the nonreacting free shear layers behind the step. The growth of the vortices and the propagation of the flamer were intimately linked. Vortex pairing was observed to be one of the mechanisms for introduction of fresh reactants into the shear layer and growth of the shear layer. Probe composition measurements of the flame showed that, in the recirculation zone, the reaction was above 99 percent complete, CO and unburnt hydrocarbons were above the equilibrium level NO sub x concentration was far below the equilibrium level and NO2 comprised a negligible fraction of NO sub x

Prevalence of attention-deficit hyperactivity disorder in students and needs modification of mental health services in Shahrekord, Iran in 2013

Introduction and Objectives: In view of the complications of Attention-Deficit Hyperactivity Disorder (ADHD) and significance of its treatment, the present study was aimed to investigate the prevalence of ADHD among elementary school students of Shahrekord and to assess the obstacles preventing patients from accessing mental health services. Materials and Methods: In this cross-sectional study, 631 eligible students were selected from elementary school students in Shahrekord County, Iran. Multi-stage stratified random sampling was adopted. Demographic data were gathered and Child Symptom Inventory-4 for parents and teachers was filled out for each student. The students with suspected ADHD were identified, and examined for the association among mental health help-seeking steps. Obstacles to mental health help-seeking were assessed. Results: ADHD prevalence was derived 17.3% and higher among male students (p=0.025). ADHD prevalence was associated with parents’ education and occupation. The evaluation and diagnosis rates were significantly associated with gender (p=0.002 and 0.005, respectively). The most prevalent obstacles facing access to mental health services were those relevant to feeling no need (86%), negative expectations of treatment (78%) and mental health system (64%). Conclusion: ADHD was highly prevalent among elementary school students. Identifying the patients and examining the existing obstacles of access to mental health system seems necessary. © 2016, Journal of Clinical and Diagnostic Research. All rights reserved

Sustainable supply and demand chain integration within global manufacturing industries

Given the emerging industrial management strategies considering three pillars of sustainability in particular, there is a vital need to determine the differences of sustainability practices within both supply and demand distribution systems through global manufacturing environments providing with the successful global trade and logistics. This research paper aims to explore the interactions and advantages of sustainability applications within both supply and demand chain management. The research framework adopted consists of survey questionnaire method which is conducted within a global tyre manufacturing company. The research results and analysis justify the need for the application of ethical codes, supply chain transformation and the effective association of industry executives, professional bodies and the government. The research study also identifies that the vital incentive factors for the organisation towards sustainable supply demand chain (SSDC) are mostly the financial benefits of doing so and therefore, a positive mind-set shift towards greening practices is required

Relationship of Conjunctival and Corneal Calcification with Secondary Hyperpara-thyroidism in Hemodialysis Patients

Abstract Background/Objective: Hyperphosphatemia is the consequence of end stage renal failure. Inadequate control of serum phosphorus results in elevated Ca×P product with subsequent soft tissue deposition in the form of conjunctival and corneal calcification. In this study, we evaluated the relationship of conjunctival and corneal calcification with secondary hyperparathyroidism in hemodialysis patients. Patients and methods: This is a descriptive–analytic study performed on 24 hemodialysis patients. We measured serum calcium, phosphorus, alkaline phosphatase, iPTH and conjunctival and corneal calcification using slit–lamp microscope according to a modification of Porter's criteria. The duration of hemodialysis was 30.7 ± 21.7 months. Results: 24 patients participated in this study. The biochemical values were: Ca: 9.1 ± 0.8 mg/dl, P: 6.5 ± 2.2 mg/dl, ipTH: 488 ± 326 pg/ml, Ca×P : 51.5 ± 16.6 The mean of conjunctival and corneal calcification score was 7.1±4. There was a positive correlation between conjunctival and corneal calcification with a duration of hemodialysis (p=0.033, r=0.436), Ca×P product (p=0.007, r=0.538). P (p=0.006, r=548) and iPTH (p= 0.028 , r=0.449). There was no correlation between conjunctival and corneal calcification with the age of the patients, serum calcium and alkaline phosphatase. Conclusion: There is a positive correlation of serum phosphorus, Ca×P product and iPTH with conjunctival and corneal calcification and no significant correlation with serum calcium implying that there is a central role for phosphorus in calcium-phosphorus deposition in soft tissues like cornea and conjunctiva, underscoring further attention to phosphorus control in hemodialysis patients

Relationship of Conjunctival and Corneal Calcification with Secondary Hyperparathyroidism in Hemodialysis Patients

Background/Objective: Hyperphosphatemia is the consequence of end stage renal failure. Inadequate control of serum phosphorus results in elevated Ca×P product with subsequent soft tissue deposition in the form of conjunctival and corneal calcification. In this study, we evaluated the relationship of conjunctival and corneal calcification with secondary hyperparathyroidism in hemodialysis patients. Patients and methods: This is a descriptive-analytic study performed on 24 hemodialysis patients. We measured serum calcium, phosphorus, alkaline phosphatase, iPTH and conjunctival and corneal calcification using slit-lamp microscope according to a modification of Porter's criteria. The duration of hemodialysis was 30.7± 21.7 months. Results: 24 patients participated in this study. The biochemical values were: Ca: 9.1 ± 0.8 mg/dl, P: 6.5 ± 2.2 mg/dl, ipTH: 488 ± 326 pg/ml, Ca×P: 51.5 ± 16.6 The mean of conjunctival and corneal calcification score was 7.1±4. There was a positive correlation between conjunctival and corneal calcification with a duration of hemodialysis (p=0.033, r-0.436), Ca×P product (p=0.007, r=0.538). P (p=0.006, r=548) and iPTH (p= 0.028, r=0.449). There was no correlation between conjunctival and corneal calcification with the age of the patients, serum calcium and alkaline phosphatase. Conclusion: There is a positive correlation of serum phosphorus, Ca×P product and iPTH with conjunctival and corneal calcification and no significant correlation with serum calcium implying that there is a central role for phosphorus in calcium-phosphorus deposition in soft tissues like cornea and conjunctiva, underscoring further attention to phosphorus control in hemodialysis patients

Leadership effectiveness and its relationship with emotional stability among nurse managers in educational hospitals related to Isfahan University of Medical Science in 2007

زمینه و هدف: تغییرات گسترده ای که امروزه در مؤسسات مراقبت بهداشتی به وقوع پیوسته است ضرورت ترکیب مهارت های رهبری و مدیریت را به وجود آورده است. به علاوه، موفقیت در مراقبت از بیمار و جلب اعتبار بیمارستان تا حد زیادی به شایستگی و علاقه کارکنان پرستاری بستگی دارد. هدف این پژوهش تعیین اثربخشی رهبری و ارتباط آن با ثبات عاطفی در مدیران پرستاری می باشد. روش بررسی: این پژوهش از نوع توصیفی همبستگی بود که در سال 1386 بر روی 128 نفر از مدیران پرستاری بیمارستان های آموزشی وابسته به دانشگاه علوم پزشکی شهر اصفهان با روش نمونه گیری سرشماری انجام شد. ابزار جمع آوری اطلاعات پرسشنامه اصول رهبری اثربخش و پرسشنامه شخصیت کنتل (Kentel) بود. در این پژوهش اثربخشی رهبری و ثبات عاطفی مورد سنجش قرار گرفت. یافته ها: یافته های پژوهش نشان داد که 8/77 مدیران خدمات پرستاری، 7/66 سوپروایزران و 1/72 سرپرستاران مورد پژوهش اثربخشی رهبری قوی داشته اند. همچنین بین اثربخشی رهبری و ثبات عاطفی در رده سوپروایزران همبستگی مستقیم و معنی دار وجود داشت (02/0 = Pو 39/0r=-) اما در سایر رده ها بین اثربخشی رهبری و ثبات عاطفی همبستگی معنی داری مشاهده نشد. نتیجه گیری: نتایج نشان داد بین اثربخشی رهبری و ثبات عاطفی در رده سوپروایزران، ارتباط مستقیمی وجود دارد لذا توجه به ویژگی های شخصیتی در انتخاب این مدیران باید مورد توجه قرار گیرد

Analytical investigation of the one dimensional heat transfer in logarithmic various surfaces

AbstractThe purpose of the present study was to investigate of the effect of temperature variation on the logarithmic surface. By using the appropriate similarity transformation for the generation components and temperature, the basic equations governing flow and heat transfer are reduced to a set of ordinary differential equations. These equations have been solved approximately subject to the relevant boundary conditions with numerical and analytical techniques. The reliability and performance of the present method have been compared with the numerical method (Runge–Kutta fourth-rate) to solve this problem. Then, LSM is used to solve nonlinear equation in heat transfer. This method is useful and practical for solving the nonlinear equation in heat transfer. It is observed that the obtained results by present analytical method are very close to result of the numerical method. Furthermore, the results show that the temperature profiles decreased by increasing the α number, and, temperature profiles increased by increasing the β number

CR embeddings of CR manifolds

We improve results of Baouendi, Rothschild and Treves and of Hill and Nacinovich by finding a much weaker sufficient condition for a CR manifold of type (n, k) to admit a local CR embedding into a CR manifold of type (n+ ℓ, k- ℓ). While their results require the existence of a finite dimensional solvable transverse Lie algebra of vector fields, we require only a finite dimensional extension