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Author(s): 

SINGH I. | ABOUL-ENEINB H.Y.

Issue Info: 
  • Year: 

    2006
  • Volume: 

    3
  • Issue: 

    3
  • Pages: 

    220-222
Measures: 
  • Citations: 

    0
  • Views: 

    443
  • Downloads: 

    284
Abstract: 

The basic characteristics of the flow-through cell Apparatus (USP Apparatus IV) including the assembly and open/closed configuration of the Apparatus have been described. The relative advantages of the flow-through cell Apparatus over other release setups have been summarized. Finally, potential applications of this setup are presented.      

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Author(s): 

BROMHEAD E.N.

Journal: 

GROUND ENGINEERING

Issue Info: 
  • Year: 

    1979
  • Volume: 

    12
  • Issue: 

    5
  • Pages: 

    40-44
Measures: 
  • Citations: 

    1
  • Views: 

    120
  • Downloads: 

    0
Keywords: 
Abstract: 

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Journal: 

Political Quarterly

Issue Info: 
  • Year: 

    2024
  • Volume: 

    53
  • Issue: 

    4
  • Pages: 

    679-651
Measures: 
  • Citations: 

    0
  • Views: 

    109
  • Downloads: 

    27
Abstract: 

In any political system or government, there are conflicting forces composed of a multitude of actors (e.g., politicians, activists and other stakeholders) with diverse ideologies that are vying for power to influence the public policy process at all stages from policy formulation and policy execution to policy assessment. Certainly, one of the most significant government policy areas is in the field of education. Contrary to the positivist approach, education policies and strategies are not formed in a vacuum. Outside all political systems, there are individuals and institutions that expectedly endeavor to set the agenda for national education policies. These external actors are often powerful enough to have a determining impact on education policies based on their worldviews and rigid ideological thinking about education.  Even though they might not necessarily oppose policies aimed at improving the quality of education in order to confront both the traditional and emerging challenges of building and maintaining efficient, equitable and forward-looking education systems.The authors try to find suitable answers to the following research questions: 1. Which actors greatly influence Iran’s decision-making and policymaking process in the field of education? 2. What are the ideological thinking and typical demands of each major group of actors influencing Iran’s education policies? In the hypothesis, it is claimed that the weaknesses of competitive mechanism by which political parties, labor unions and non-governmental organizations often crucially influence policymaking in the public sphere have led to a situation in the existing political arena that the demands of stakeholders and actors who are aligned with the dominant political ideology are predominantly considered by the policymakers’ agenda-setting efforts in the field of education. For the purpose of hypothesis testing, the authors use a composite theoretical framework based on Habermas’ theory of public space, Althusser's theory of ideology (and ideological state Apparatuses), and Bourdieu's field theory. They relied on the works of these prominent scholars because Habermas's theory of the public sphere offers valuable lenses through which one might be able to examine the intricate interplay between the external actors and the broader public domain. Althusser's concept of ideological Apparatus serves as a critical tool for understanding how ideologies are disseminated and mobilized in the education policy arena. Furthermore, Bourdieu's theory of the field provides valuable insights into the power dynamics that shape the education policy landscape.Using the method of critical analysis, the demands related to the material interest, socio-economic needs, and politico-cultural preferences of the key activists and stakeholders (e.g., the Ministry of Education, administrative authorities, professional associations for teachers, student councils, parent–teacher association, seminaries and theological institutions, etc.) as the factors influencing the education policymaking process will be examined. By subjecting these demands to a careful scrutiny within their chosen theoretical framework, the authors attempt to reveal the ideological forces that underlie Iran's education policies. In the hope of overcoming the shortcomings of the country’s education policymaking efforts, a few policy recommendations are ultimately presented in the concluding section, for instance, the necessity to base the education policymaking on an inclusive participatory approach, strengthening the role of all relevant governmental and non-governmental actors working cooperatively in the public sphere, and optimally using the capacity of all major stakeholders’ scientific associations, organizations and labor unions in the field of education in Iran.

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Issue Info: 
  • Year: 

    2004
  • Volume: 

    3
  • Issue: 

    10
  • Pages: 

    23-27
Measures: 
  • Citations: 

    1
  • Views: 

    1035
  • Downloads: 

    0
Abstract: 

Background & Objective: Carotid baroreflex is the most important system of moment-by-moment control of blood pressure. In the past, in order to test carotid baroreflex, invasive methods were incorporated. In 1975 Eckberg introduced a non-invasive Apparatus for testing carotid baroreflex sensitivity. The main objective of the present research was to design and construct a more progressive version of the Eckbergs model Apparatus. This Apparatus would be able to stimulate cervical baroreceptors through sucking the neck. This device will enable physiologists and pharmacologists to perform many researches about carotid baroreceptors.Methods: In this Apparatus advanced electronic and mechanical ciruits apply negative controlled pressure on the carotid sinus and increase the blood pressure. By application of negative pressure in front of neck, it stretches the soft cervical tissues including carotid sinus. One of the major modifications included was using resistant rubber instead of lead sheets for making the neck chamber. The whole system was controlled by a computer, which made our system more advanced as compared to the original model suggested by Eckberg. In order to test the Apparatus, 12 young male volunteers received a -30mmHg to -90mmHg neck chamber pressure for 10 seconds. Any changes in cardiac cycles during the suction were being recorded using cardiopen II. So the charges could be evaluated.Results: The findings showed that stimulation of carotid baroreceptors increased the length of cardiac cycles abruptly. This increase is significantly different from the baseline( p<0.003) and shows the correct functioning of the equipment. Conclusions: The final tests confirmed the capability of the Apparatus in stimulating carotid baroreceptors. This device can be used in other universities and research centers.

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Author(s): 

GHAROUNINIK M.

Issue Info: 
  • Year: 

    2009
  • Volume: 

    3
  • Issue: 

    6
  • Pages: 

    1-7
Measures: 
  • Citations: 

    0
  • Views: 

    2587
  • Downloads: 

    0
Abstract: 

One of the methods for investigating the mechanical properties of rocks is direct shear test. It is considered as the simplest and the most commonly used methods for the shear testing of rock specimens containing a weakness plane or a discontinuity. This kind of test is normally carried out in the laboratory, but it may also be performed in the field, using a portable shear box to test discontinuities contained in a piece of drill core. As the normal and shear stresses are applied by hand pumps in the portable shear tests, there are some doubts on the accuracy of results. These ambiguities may be eliminated when using electrical hydraulic pumps instead of mechanically controlled hand pump for applying shear stress on the specimen. The shear stress increasing rate would be regular and may be controlled and changed by means of electrical pumps. As the power supplier will be a 12 volts battery, the developed shear Apparatus will also be portable. A series of shear tests have been conducted using both conventional and developed direct shear test Apparatus. To be able to have a close comparison, artificially made specimens containing a discontinuity have been tested. The results obtained from these Apparatus show some discrepancies which makes one think about the results of the conventional portable shear box.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    41
  • Issue: 

    2
  • Pages: 

    137-146
Measures: 
  • Citations: 

    0
  • Views: 

    1281
  • Downloads: 

    0
Abstract: 

This paper presents a recently developed automated pullout Apparatus for soil-geogrid strength and deformation behavior investigation. The new Apparatus is capable of applying load/displacement controlled monotonic/cyclic loads at different rates/frequencies, different wave shapes and loading patterns, through a computer closed-loop system. An extruded uniaxial geogrid and silica sand are used throughout the experiments. The effects of normal pressure (surcharge) and relative density are investigated on displacement distributions and pullout capacity of the geogrid in both monotonic and cyclic tests.In monotonic tests, it is observed that with increase in relative density and surcharge, pullout resistance has increased. In cyclic tests, despite some minor observations of post-cyclic strength increased, no specific comment can be made at this stage on the post-cyclic strength.

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    9
  • Issue: 

    5
  • Pages: 

    525-532
Measures: 
  • Citations: 

    0
  • Views: 

    138
  • Downloads: 

    115
Abstract: 

Background: Panoramic imaging is one of the most common imaging methods in dentistry. Regarding the side-effects of ionizing radiation, it is necessary to survey different aspects and details of panoramic imaging. In this study, we compared the absorbed x-ray dose around two panoramic x-ray units: PM 2002 CC Proline (Planmeca, Helsinki, Finland) and Cranex Tome (Soredex, Helsinki, Finland). Materials and Methods: In this cross-sectional study, 15 thermoluminescet dosemeters (TLD-100) were placed in 3 semi-circles of 40cm, 80cm and 120cm radii in order to estimate x-ray dose. Around each unit, the number of TLDs in each semicircle was 5 with equal intervals. The center of semicircles accords with the patient’ s position. Each TLD was exposed 40 times. These dosemeters were read out with a Harshaw Model 4000 TLD Reader (USA). The calibration processing and the reading of dosemeters were performed by the Atomic Energy Organization of Iran. Results: The mean absorbed dose in three lines of PM 2002 CC Proline was 123. 2± 15. 1, 118. 0± 11. 0 and 108. 0± 9. 1 μ Sv, (p=0. 013). The results were 140. 4± 15. 2, 120. 2± 10. 4 and 111. 6± 11. 2 μ Sv in Cranex Tome (p=0. 208), which reveals no significant difference between two systems. Conclusion: There are no significant differences between the mean absorbed dose of surveyed models in panoramic imaging by two units (PM 2002 CC Proline and Cranex Tome). These results were less than occupational exposure recommended by ICRP, even at the highest calculated doses.

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Issue Info: 
  • Year: 

    2009
  • Volume: 

    55
  • Issue: 

    1
  • Pages: 

    427-45
Measures: 
  • Citations: 

    1
  • Views: 

    122
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2003
  • Volume: 

    27
  • Issue: 

    B1
  • Pages: 

    0-0
Measures: 
  • Citations: 

    0
  • Views: 

    336
  • Downloads: 

    0
Abstract: 

A new simple shear Apparatus which is capable of applying monotonic and cyclic load on soil specimens is fabricated. Cylindrical specimens are placed in a special triaxial type cell where confining pressure, pore air and pore water pressures can be controlled. The Apparatus consists of an inner part and an outer portion. The inner portion that is inside the triaxial cell consists of a pedestal attached to a movable base. The movable base is mounted on a pair of horizontal rolling tables, which makes the inner portion capable of moving back and forth, horizontally. The outer portion consists of a cylindrical frame that holds the top cap and prevents its lateral movement. A high air entry ceramic disk is sealed into the pedestal using an epoxy resin. The specimen is sheared in a simple shear mode. The horizontal load required to shear the specimen, divided by the nominal area of the specimen gives the shear stress. Soil suction can be measured using the so-called axis-translation technique [1] by increasing the pore air pressure through the top low air entry disk and recording the pore water pressure through the high air entry ceramic disk. Using the fabricated Apparatus it is possible to measure and control the vertical normal stress as well as the all-around confining pressure applied to the soil specimen. Hence, testing the soil under initial isotropic or anisotropic confining pressure could be easily achieved. In this paper, the main features of the Apparatus are discussed via some test results carried out on unsaturated soil specimens.

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Journal: 

Issue Info: 
  • Year: 

    2001
  • Volume: 

    -
  • Issue: 

    10
  • Pages: 

    49-65
Measures: 
  • Citations: 

    1
  • Views: 

    1495
  • Downloads: 

    0
Abstract: 

The goal in this semi-experimental study was to design and make an electronic Apparatus, the shuttle Run (SH.R) and examination of precision and reliability of the Apparatus and shuttle run test type 1 in estimating of the value Vo2max.After designing and making of electronic Apparatus shuttle run (SH.R) 21 males 20-25 age of BU-ALI-SINA university of Hamedan are selected for the test. Testes subjects with 48 hours time distance performed shuttle run test type 1 with time distance 48 hours for two time periods.Meanwhile, the reliability of SH.R Apparatus in playing the song and automatic computation of suggested equation Vo2max was examined. The correlation of R =0.89 for two times estimating of aerobic capacity of students obtained with use of shuttle run test type 1 and SH.R Apparatus (SE=2.07 , P=0.0000). Also, the reliability of SH.R Apparatus in playing song and computation of VO2max has been examined that the correlation of RZ=1 obtained which represent the reliability of SH.R Apparatus and shuttle run test type 1. The finding of present research indicated that designed Apparatus SH.R is a reliable Apparatus for performing the shuttle run test typ1, with ability estimate aerobic capacity contemporary for 8 persons and ability for perform in the restricted physical areas 20 meters, and the shuttle run test type 1 enjoys from up-reliability in estimating aerobic capacity of subjects.

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