Application of a new control strategy on actuators used in electromagnetic vehicle suspension systems has been studied in this paper. The vehicle is modeled as a quarter car in which the unsprung mass is supported by two vertically arranged electromagnetic actuators having a nonlinear behavior. The nonlinear actuators, having forces proportional to the square of the electric current and inversely proportional to the square of their distances from the mass, are controlled using a simple and feasible control strategy named "Performance Based Time-Delay". It is shown that this control strategy can result in excellent system performance compared to the conventional passive suspension system or other control strategies implemented in active suspension systems. The vibrations due to road roughness are controlled by changing magnetic fluxes of the actuators. Less required computational steps, use of an on-line digital computer, overall system simplicity, and achievement of a better response to larger high frequency disturbances are among the advantages of the system controller.

Background: Beta thalassemia major (BTM) is a genetic disorder which is common in Kerman province of Iran. New methods of care have increased their survival. Objective: The objective of this descriptive study was to assess the frequency of skin and mucosal complications of BTM patients. Patients & Methods: All BTM pantients referred to Kerman - Darman Hospital in 1377 (150 cases) were evaluated. Derma tologic signs & symptoms were diagnosed by physical examination and serum ferritin levels were measured. Results: Skin hyperpigmentation (65.3%), mucosal hyperpigmentation (41.3%), coarse nail (34%) and coarse hair (20.7%) were the most common signs. They were related to the age and serum ferritin levels but sex of patients and dose of desferral had no significant relation with skin complications. Conclusion: Skin and mucosal lesions are common in BTM. An exact exam and control of serum ferritin level with desferral is recommended to prevent skin complications.      

New Page 1 Zinc was electrodeposited from an acidic sulphate solution on commercial steel sheet substrates galvanostatically at 10,20, and 100 mA/cm2. The steel substrates had an average roughness number of 1.34 microns and a high percentage of its grains had their (111)planes parallel to the plate surface. During electrodeposition at 10 mA/cm2, on some specimens, there was an intense potential fluctuation around -870 m V vs Saturated Calomel Electrode (SCE). During this period zinc hydroxide precipitated on the surface. After a certain time, the potential dropped to -1020 for zinc deposition. Zinc nuclei were seen to precipitate from zinc hydroxide. Increasing current density changed nucleation mode from progressive to instantaneous, and also changed the size, morphology, and texture of zinc deposits.

Zonous Kaolinite bearing clay deposit is made by hydrothermal alteration of volcanic rocks mainaly of andesite and dacite. Kaolinite, quartz and calcite are the main mineral compositions. As quartz in the volcanic rocks is cryptocrystalline, it is too difficult to separate it from kaolinite. The physical properties and chemical composition of Zonous ceramic grade kaolinite bearing clay are directly related to its nature and geological formation.The percentage of SiO2 in Zonous clay is higher but the amount of Al2O3 is lower than Diamond kaolinte. For this reason the ceramic products of zonous clays have lower resistance to thermal shocks and module of rupture. High roughness, low plsticity and possible greater deformation during firing (Production of Ceramics) are other reasons for limiting the use of Zonous ceramic grade clays. The percentage of calcium oxide (CaO) in Zonous clay is higher in comparison with Diamond Kaolin but potassium oxide (K2O) which plays as a flux in ceramic products is lower in zonous. The high pereentage of CaO which has a high melting point can raise the viscosity as a result lead to Crack in ceramic products. Finally with these colour properties, the Zonous ceramic grade kaolinite bearing clays, can be used as a filler in paper, paint and rubber industries.

In this study the effects of the surface a condition of steel rebar on its cathodic current efficiency was investigated The catholic current efficiencies for steel rebar with different surface conditions were determined from cyclic polarization experiments. The results showed that cathodic faradic current increased with surface irregularity. Surface condition of steel in saturated calcium hydroxide also had an effect on double layer capacitance.

A computer program was developed to predict the dispersion of gaseous pollutant in the atmosphere. This program relies on puff method, and in order to consider the wind shear effects, the program has the ability to consider the complete dynamic and unsteady atmospheric conditions. Plume rise of hot pollutants due to buoyancy effects was also considered. The program has the ability to perform the real-time calculations and uses on-line data of atmospheric conditions that are measured directly. In order to consider the effects of the presence of buildings and other obstacles or sudden changes in surface roughness by the dispersion of released materials, a model was added to evaluate the dispersion coefficients in the wake of obstacles. Using this relatively complete simulation, we analyzed the effects of the above parameters on the dispersion of gaseous pollutants in the atmosphere.

The first dental implant system made in IRI introduced. The implant is a one stepped cylinder made of grade 2 commerical titanium. The surface roughness is 1.6 um. This system can be use as non-submerged and submerged impglants. The Implants are in the diameters of 3.4 and 4 mm, length of 13 ond 15 mm. The one - stepped implants has a sophisticated surface. Four types of abutments are designed. The success easy handling and the low cost which common people can afford, Justify the use of the dental implants as a choice of treatment.

Different glasses suitable for temperature sensing in the fiber optic sensors were studied in this article. The phase changes for eight different glass materials were calculated and results were compared. Our results showed that extra dense flint glass is the most sensitive one, while pure silica results in the lowest phase change. In another study the effect of wavelength on the phase variation was also investigated and the results were presented. Finally, the effect of glass formation in phase change was considered for different glasses, which were prepared using different techniques. The result showed that the Corning glass #7940 offers the highest sensitivity in comparison with the other three glasses for temperature sensing. Our studies for different silica glasses indicated that glass formation is important in preparing the glass materials required for the fiber sensors.