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Journal: 

Issue Info: 
  • Year: 

    2001
  • Volume: 

    7
  • Issue: 

    2
  • Pages: 

    91-105
Measures: 
  • Citations: 

    0
  • Views: 

    964
  • Downloads: 

    0
Abstract: 

Fast computers and powerful data management & graphk software's are indispensable elements of precision farming technology. Activities like yield monitoring and on the go soil sampling provide vast amount of data on the variation in crop and soil conditions throughout the field. The collected data must be processed and reduced into MAPs to provide serviceable information. The objectives of this study were to develop a software for analyzing the COMPACTION data of a soil excavator and convert it into a colored MAP. A program was written in C++ language with about 2000 lines and it was evaluated by a simulation method. For testing the software, a force measuring hydro-electronic transducer was designed and fabrkated. By exciting the transducer its output signals were sent to the software which was loaded on a Pentium Pc. Execution of each part of the program follows a flow chart which starts by an icon identifier on the main display. On line progress of the COMPACTION MAP was visible during the operation period of the transducer. After conduction of each test and making the selevant file, tables of data and functional plot of COMPACTION versus depth at any soil profile is accessible. Results showed that with high confidence, this software could be conjugated on soil COMPACTION scanning. Its facilities seem to be valuable enough to make it as a geographical information system (GIS) software.

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Issue Info: 
  • Year: 

    2012
  • Volume: 

    22
  • Issue: 

    94
  • Pages: 

    105-111
Measures: 
  • Citations: 

    0
  • Views: 

    1188
  • Downloads: 

    0
Abstract: 

Isolated non COMPACTION of left ventricular myocardium is a rare cardiomyopathy due to abnormal endomyocardialmorphogenesis.The incidence of non COMPACTION cardiomyopathy in the general population has been estimated at 0.05% to 0.25% per year.NCCMP is a heart muscle disorder that is still little known among physicians and was first described in 1984 by engberding and bender.Echocardiography is diagnostic method of choice.We report our recent experience with six NCCM patients who present at our hospital between September2011and April 2012. Three patients were with severe symptoms, two patients with mild symptoms and one patient was asymptomatic. serial follow up and medical management is advisable in these patients for improving outcome.

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Author(s): 

LOGHAVI M. | KHADEMI M.R.

Issue Info: 
  • Year: 

    2006
  • Volume: 

    8
  • Issue: 

    1
  • Pages: 

    1-13
Measures: 
  • Citations: 

    0
  • Views: 

    415
  • Downloads: 

    219
Abstract: 

Development of sensors to detect the location and depth of hard pans in real time is a major restriction on the application of Site Specific Crop Management (SSCM). In this study, a soil COMPACTION profile sensor equipped with four horizontal operating penetrometers for on-the-go sensing and MAPping of the location and intensity of hard pans artificially formed in a soil bin was developed and tested. The leading edge of a 600 mm long vertical soil cutting blade held four 8 mm diameter, 80 mm long, and 30 degree conic tip stainless steel soil penetrating rods equally spaced at 100 mm vertical intervals. With this arrangement, when the cutting blade was driven into the soil up to a 500 mm depth, the conic tips sensed soil penetration resistances at 100, 200, 300 and 400 mm depths. The penetration resistance force was transmitted by the rod end to the elastic diaphragm of a hydrostatic oil chamber beneath each rod. Each oil chamber was connected to a force magnifying piston and cylinder located off the soil engaging tools. The penetration force was magnified five times before being sensed by a strain gage load cell. Software programs with the capability of discriminating 16 levels of soil COMPACTION intensity were developed for monitoring soil impedances sensed by the soil probes and for converting them to soil COMPACTION MAPs. For conducting the tests in the soil bin, the sensor mounted on the tool carrier frame was moved along the bin, where artificially formed compacted soil blocks with various densities (1.45, 1.65 and 1.85 Mg/m3) were placed at different locations and depths (up to 500 mm deep at 100 mm increments). While the probe was cutting and advancing through the soil, the corresponding COMPACTION MAP was simultaneously displayed on a PC monitor, and the soil penetration resistance data of all four sensing tips was displayed and stored in program files.

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Author(s): 

YASROBI S.S. | SFANDE R.

Issue Info: 
  • Year: 

    2002
  • Volume: 

    -
  • Issue: 

    8
  • Pages: 

    93-106
Measures: 
  • Citations: 

    0
  • Views: 

    762
  • Downloads: 

    0
Abstract: 

Correlations between plasticity index (LL, PL ,PI), COMPACTION effort and COMPACTION characteristics (ωopt,γdmax) are of most importance in soil mechanics. Clays with different plastic properties are collected from different regions in Azarbaijan and Gorgan. These soils have been compacted with different COMPACTION methods (Standard Proctor, Modified Proctor and Reduced COMPACTION). Then changes in the COMPACTION characteristics due to variation of plastic properties and COMPACTION effort have been investigated. Man made clayey soils are produced from the natural collected soils. These soils had constant fine grain percent ages. The effect of fine grains on COMPACTION characteristics has been studied in these samples. In this research it has been concluded that increasing of COMPACTION effort has different effects on improving of maximum dry density. Soils with high PI are more affected with COMPACTION effort than low PI clays. COMPACTION curves shape showed that in clays with high PI the concaveness of the COMPACTION curve is low and their sensitivity to water content variation are less than those of high PI clays.

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Journal: 

Iranian Heart Journal

Issue Info: 
  • Year: 

    2006
  • Volume: 

    7
  • Issue: 

    1
  • Pages: 

    60-63
Measures: 
  • Citations: 

    0
  • Views: 

    288
  • Downloads: 

    80
Abstract: 

Isolated ventricular non-COMPACTION is a rare congenital cardiomyopathy, manifested morphologically as prominent myocardial trabeculations and deep recesses that communicate with the ventricular cavity. Heart failure is the most common presenting condition. This report is illustrative of isolated ventricular non-COMPACTION in a 51-year-old male. The diagnosis was made when he presented with congestive heart failure.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    5
  • Issue: 

    2
  • Pages: 

    83-87
Measures: 
  • Citations: 

    0
  • Views: 

    334
  • Downloads: 

    185
Abstract: 

Introduction: Root canal obturation seals the root canal system to prevent re-entry and/or growth of microorganisms. The provision of an appropriate restoration to coronally seal the access cavity affects the success of endodontic treatment. The purpose of this study was to evaluate the coronal microbial leakage in root canals that were either filled by lateral COMPACTION, GuttaFlow or warm vertical COMPACTION.aterials and Methods: In this ex vivo study, 80 single-rooted human extracted teeth were randomly divided into three experimental groups (n=20) and two positive and negative control groups (n=10). The teeth in experimental groups were obturated with cold lateral COMPACTION, GuttaFlow system or warm vertical COMPACTION techniques. After sterilization of the whole system with gamma-ray, saliva leakage was tested using a split-chamber model.Specimens were monitored every 24 hours for 30 days. The data were analyzed using log-rank and Kaplan-Meier survival analysis tests.Results: There were no significant differences in impeding saliva leakage between the three experimental groups (P>0.05).Conclusion: Under the conditions of this ex vivo study, it can be concluded that the sealing ability of cold lateral COMPACTION, warm vertical COMPACTION and GuttaFlow system was comparable.

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Issue Info: 
  • Year: 

    2008
  • Volume: 

    12
  • Issue: 

    44
  • Pages: 

    245-255
Measures: 
  • Citations: 

    0
  • Views: 

    1498
  • Downloads: 

    0
Abstract: 

For prevention of soil COMPACTION, knowledge of allowable compression stress limit (COMPACTION strength) in soil is important. Pre-COMPACTION stress ( spc ) was introduced as soil COMPACTION strength and often used as a criterion for evaluation of soil susceptibility to COMPACTION. In this research, pre-COMPACTION stress was measured for a sandy loam soil with plate sinkage (PST) and confined compression (CCT) tests. To prepare soil samples with different initial compactness, two soil water contents (17 and 19%db) and six pre-loading stresses (0, 25, 50, 100, 150 and 200 kPa) were used. The effects of soil water content and pre-loading stress on estimated pre-COMPACTION stress were studied using a factorial experiment in a completely randomized design with three replications. The spc values were significantly influenced by loading combination and soil water content. For PST, pre-load increase and higher soil water content resulted in higher and lower values of spc , respectively. However, predicted spc value increased with higher soil water content for CCT. The results also showed that the spc predicted with PST was accurate, whereas the values obtained with CCT were 4.5 (at 17 %db) and 8.5 (at 19 %db) times higher than the applied pre-loads. Overall, the findings indicated that spc prediction depends on the compression test, and PST could be a suitable method for soil pre-COMPACTION stress (COMPACTION strength) determination in sustainable soil management, i.e., soil trafficability and tillage. The PST method is also suitable to assess the effect of managing factors on pre-COMPACTION stress.

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Issue Info: 
  • Year: 

    2006
  • Volume: 

    1
  • Issue: 

    2
  • Pages: 

    33-41
Measures: 
  • Citations: 

    1
  • Views: 

    2540
  • Downloads: 

    0
Abstract: 

Because of some special properties such as high melting point and hardness manufacturing of tungsten parts is very difficult by some processes such as machining, casting, etc. An alternative method for making these parts is powder metallurgy technique. Because of some limits in powder metallurgy technique the explosive COMPACTION method was applied for COMPACTION of tungsten powder. At first the powder metallurgy and explosive COMPACTION processes were explained in this paper. Already, these two methods were applied for manufacturing of several samples using tungsten powder. All of samples have a cylindrical shape with 3 mm length and 20 mm diameter. In order to compare the mechanical and metallurgical properties of these samples, the density and hardness were determined and fracture surface of cross sectional area of them were analyzed by scanning electron microscope (SEM). The results indicated that the higher density (10% higher) and hardness (75% higher) for tungsten products can be obtained by explosive COMPACTION method.

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Issue Info: 
  • Year: 

    1387
  • Volume: 

    1
Measures: 
  • Views: 

    503
  • Downloads: 

    0
Abstract: 

خصوصی سازی به خودی خود یک هدف نیست. بلکه یک ابزار است. پس یکی از نکات کلیدی این است که خصوصی سازی را به عنوان هدف قلمداد نکنیم در حالی که این سیاست، ابزاری بیش نیست و فقط برای رسیدن به یک هدف دیگر از آن استفاده می شود. یکی از مهمترین هدف های خصوصی سازی افزایش کارایی، بهره وری و افزایش قدرت رقابت پذیری پس از فرآیند خصوصی سازی است که متاسفانه این هدف در حاشیه قرار گرفته است. هدف از این مقاله ارائه مدلی برای خصوصی سازی در صنعت پتروشیمی برای کاهش بروکراسی، توجه به سودآوری، افزایش قدرت تصمیم گیری، افزایش قدرت تحرک و چابکی، ایجاد زمینه های همکاری های منطقه ای و اتحادهای استراتژیک و افزایش قدرت رقابت پذیری صنایع پتروشیمی ایران در مواجه با رقبای منطقه ای و جهانی است.

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Author(s): 

SADEGHI SH. | HAJI SADEGHI H.

Issue Info: 
  • Year: 

    2009
  • Volume: 

    4
  • Issue: 

    1
  • Pages: 

    10-14
Measures: 
  • Citations: 

    0
  • Views: 

    305
  • Downloads: 

    111
Abstract: 

Introduction: Proper apical seal and obturation density are essential to long-term success of root canal  therapy (RCT). The apical seal and density of lateral COMPACTION techniques using stainless-steel and nickel-titanium spreaders and vertical COMPACTION with BeeFill device were compared in this in vitro study.Materials and Methods: A total of 66 extracted maxillary central incisors were instrumented. The volume of each canal was determined after preparation. The weight of each root was measured before and after obturation. Lateral COMPACTION technique was performed using stainless-steel (groups a) and nickel-titanium spreaders (groups b), filled with AH26 sealer (groups 1a and 1b) and without sealer (groups 2a and 2b). Canals in vertical COMPACTION technique (groups c) were filled with (group 1c) and without (group 2c) sealer using Beefill system. Density was determined as the ratio of weight/volume. Sealing ability was evaluated using dye penetration method. Data was analyzed with ANOVA and T-test.Results: T-test results showed a significant difference between groups which were filled with/without sealer for their apical sealing ability (P<0.001), however there was no significant difference in obturation density (P=0.397). ANOVA test showed that there was a significant difference in apical sealing ability among the different experimental groups (P<0.001), while there was no significant difference in density (P=0.456) of obturation. The mean dye leakage for groups using sealer was significantly different to those obturated without sealer. The sealingability of obturation techniques using sealers were significantly more than those without sealers. Conclusion: Under the condition of this in vitro study, density and apical sealing ability of these three obturation methods had no difference. However, the quality of apical seal has improved using AH26 sealer.

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