Search Results/Filters    

Filters

Year

Banks




Expert Group











Full-Text


Issue Info: 
  • Year: 

    2016
  • Volume: 

    47
Measures: 
  • Views: 

    174
  • Downloads: 

    65
Abstract: 

WE EXTEND THE CONCEPT OF STRONGLY COMPACT AND SEMI COMPACT SPACES. A SPACE (X, T) IS SAID TO BE SEMI L-COMPACT (RESP. STRONGLY L-COMPACT) IF EVERY COVER OF X BY SEMI-OPEN (RESP.PREOPEN) SETS HAS A SUBCOVER OF X WHOSE CARDINALITY IS LESS THAN L, WHERE L IS THE LEAST INFINITE CARDINAL NUMBER WITH THIS PROPERTY. WE CHARACTERIZE SEMI L-COMPACT AND STRONGLY L-COMPACT SPACES.

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

View 174

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 65
Issue Info: 
  • Year: 

    2016
  • Volume: 

    4
Measures: 
  • Views: 

    196
  • Downloads: 

    81
Keywords: 
Abstract: 

IN THIS TALK, SOME PROPERTIES OF LIPSCHIZ OPERATORS ARE STUDIED. CONDITIONS UNDER WHICH THE VECTOR-VALUED LIPSCHITZ ALGEBRA LIP (X, A) IS ISOMETRICALLY ISOMORPHISM TO LIP (X) ⊗ A ARE INVESTIGATED.

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

View 196

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 81
Author(s): 

Najari Fatemeh

Issue Info: 
  • Year: 

    2020
  • Volume: 

    55
  • Issue: 

    2
  • Pages: 

    373-388
Measures: 
  • Citations: 

    0
  • Views: 

    256
  • Downloads: 

    0
Abstract: 

The input-output TABLEs provide useful information regarding the economic and social situations of countries. The world input-output database (WIOD) enables simultaneous comparison of economic and social situations of countries worldwide. The Europe Commission has provided the WIOD for 27 members of the commission, 16 large non-Europe countries and rest of the world from 1995 to 2014. The input-output of the economic sectors of Iran are aggregated with those of the rest of the world. Hence, it is not possible to study the situation of Iran in the world TABLE. In addition, it is not possible to examine the reciprocal effects of the economic policy of Iran or other countries on production sectors of each other properly. To this end, the Iran input-output TABLE for the year 2011 is highlighted, where, in the same year, Iran stood 44th in WIOD. Thus, in addition the new TABLE allows the researcher to study the situation of Iran in the world economy, it make possible to reveal the effect of internal policy on economic sectors of other countries and vice versa.

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

View 256

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    1394
  • Volume: 

    1
Measures: 
  • Views: 

    337
  • Downloads: 

    0
Abstract: 

لطفا برای مشاهده چکیده به متن کامل (PDF) مراجعه فرمایید.

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

View 337

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0
Issue Info: 
  • Year: 

    2009
  • Volume: 

    6
  • Issue: 

    4
  • Pages: 

    0-0
Measures: 
  • Citations: 

    0
  • Views: 

    317
  • Downloads: 

    0
Abstract: 

Point of view. In this study, a shaking-TABLE was used for concentrating a manganese ore sample from the Ghasem Abad area in Kerman, Iran. Experiments were designed by using L The influence of each variable and their interactions on the operation of the device were studied. The variables under investigation were: TABLE slope, TABLE frequency, water flowrate, feed rate, and particle size. The manganese concentrate grade, recovery, and separation efficiency were used as response variables. It was shown that water flowrate, TABLE slope, feed rate, and particle size are the significant variable on concentrate grade; while, all the variables influence manganese recovery. Also, water flowrate, TABLE slope, and TABLE frequency have an important effect on manganese separation efficiency. Finally, three mathematical models were presented to predict the values of each response variables.Among all gravity concentration methods, the shaking-TABLE is the most effective one from the metallurgical8 Taguchi design with five variables, each in two levels.  

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

View 317

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Author(s): 

Alijani Aliakbar

Issue Info: 
  • Year: 

    2023
  • Volume: 

    4
  • Issue: 

    2
  • Pages: 

    21-24
Measures: 
  • Citations: 

    0
  • Views: 

    41
  • Downloads: 

    2
Abstract: 

The aim of this paper is to introduce and give preliminary investigation of ∂-partial-locally COMPACT spaces. Locally COMPACTness and ∂-partial-locally COMPACTness are independent of each other. Every locally COMPACT Hausdorff space is ∂-partial-locally COMPACT. But the converse is not true even though it be Hausdorff. ∂-partial-locally COMPACTness is a topological property. ∂-partial-locally COMPACTness is not preserved by the product topology.

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

View 41

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 2 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2022
  • Volume: 

    15
  • Issue: 

    11
  • Pages: 

    766-777
Measures: 
  • Citations: 

    1
  • Views: 

    450
  • Downloads: 

    0
Abstract: 

Background and Objectives Psychological flexibility is the main goal of acceptance and commitment treatment. However, an efficient tool is needed to measure it. Thus, the aim of this study was to investigate the psychometric properties of the Persian version of the Comprehensive assessment of Acceptance and Commitment Therapy processes (COMPACT) Scale. Methods The statistical population of the present study included all people aged 18 to 60 years in the period from August to October 1400. The statistical sample of the study included 256 people who were selected by available sampling method through online call. In order to evaluate the convergent and divergent validity, the second version of the Acceptance and Practice Questionnaire (AAQ-II), the difficulty in emotion regulation scale (DERS-16) and the Depression, Anxiety and Stress Scale were used. The factor structure of the questionnaire was examined through confirmatory factor analysis. Reliability was performed using Cronbach’, s alpha method and retesting and analyzing the data with version 25 of SPSS software and version 8. 8 of LISREL. Results The results of confirmatory factor analysis, as in the original form, confirmed three factors: Openness to Experience, Behavioral Awareness and Valued Action. Also, Cronbach’, s alpha coefficient for the whole scale is 0. 89 and for the subscales of Openness to Experience, Behavioral Awareness and Valued Action were equal to 0. 91, 0. 88, 0. 85, respectively. In addition, the four-week retest coefficient for the whole questionnaire was 0. 80 and for the subscales of Openness to Experience, Behavioral Awareness and Valued Action were equal to 0. 89, 0. 78, 0. 79, respectively. Also, correlation coefficients indicated favorable convergent and discriminant validity of the questionnaire (P<0/001). Conclusion According to the obtained results, it can be said that the Comprehensive assessment of Acceptance and Commitment Therapy processes (COMPACT) Scale is a reliable and valid scale for measuring psychological flexibility.

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

View 450

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 1 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Journal: 

GEOGRAPHICAL DATA

Issue Info: 
  • Year: 

    2019
  • Volume: 

    28
  • Issue: 

    111
  • Pages: 

    83-95
Measures: 
  • Citations: 

    0
  • Views: 

    507
  • Downloads: 

    0
Abstract: 

Extended Abstract Introduction Monitoring and assessment of the biosphere are two essential tasks at any scale. Based on this, forests play an important role in controlling the climate and the global carbon cycle. For this reason, biomass and consequently forest height are known as the key information for forest monitoring. In the recent decade, several studies have shown that the Synthetic Aperture RADAR (SAR) imaging systems in COMPACT Polarimetry (CP) mode can overcome the disadvantages of Full Polarimetric (FP) SAR imaging systems and provide a good performance in various remote sensing applications such as monitoring and managing the important natural resources like forests. In this regard, a novel technique named Polarimetric Interferometry SAR (PolInSAR) has been further considered as a powerful tool for forest height estimation. Materials & Methods In this research, the performance of the COMPACT PolInSAR (C-PolInSAR) data in Dual Circular Polarization (DCP) mode has been investigated in order to retrieve the forest height. For this reason, the common methods which are used for forest height estimation including Digital Elevation Model (DEM) differential method, coherence amplitude inversion, and phase & coherence inversion methods were applied and implemented on these data. In all of the aforementioned methods, LL+RR and LR polarizations were considered as the selected channels for estimating the volumetric and ground coherences, respectively. Then, the estimated coherences were considered as the input parameters for all of the mentioned methods. Results & Discussion To evaluate the performance and the efficiency of C-PolInSAR data in DCP mode, the results obtained from these data were compared with those obtained from Full PolInSAR (F-PolInSAR) data. The results obtained in this study in two datasets simulated from PolSARProSim software in both L and P bands showed that the C-PolInSAR data in DCP mode yielded a similar result compared to the F-PolInSAR data for forest height estimation (when the HH􀀍 VV polarization is adopted as the ground backscattering), because, in this case the LL+RR and the LR polarizations are equal to the HV and the HH􀀍 VV polarizations, respectively, particularly, the C-PolInSAR data in DCP mode yielded 􀀗 􀀖 ، پاییز 􀀏 􀀏 􀀏 ، شماره 􀀐 􀀖 دوره 􀀆 􀀇 لنامه علمی-پژوهشی اطلاعات جغرافیایی 􀂐 ف 12 / Scientific-Research Quarterly of Geographical Data (SEPEHR) Vo. 28, No. 111, Autumn 2019 0. 78 m and 0. 55 m improvements for forest height estimation in L and P bands, respectively. In addition, all of the employed methods provided better and closer results compared to the real forest height (i. e. 18 m) in L band compared to P band, because the electromagnetic (EM) waves have a more penetration into the canopy in L band compared to P band. Thus, the attenuation of these waves is low and consequently the height estimation is more accurate. Without considering the used bands, the DEM method provided the lowest precision compared to other methods, because the HV (or LL􀀍 RR) phase center can lie anywhere between half the tree height and top of the canopy. The exact location of this phase depends on two vegetation parameters which are the wave mean attenuation and the vertical canopy structure variations. In this case, the trees have very thin canopies, and consequently, the attenuation is small, but the phase center is high due to the structure. In other words, when the canopy extends over the entire forest height, then the phase center can be at half the true height for low density (low attenuation), through to the top of the canopy for dense vegetation (high attenuation). This ambiguity is inherent in single baseline methods, and in order to overcome this, model-based correction methods need to be employed. It was also observed that the coherence amplitude method is among the weak algorithms due to ignoring the phase and its sensitivity to the attenuation and structural variations but it can be used as a backup solution when other approaches fail. Finally, the phase and the coherence inversion method had better results than two aforementioned methods for the forest height estimation. In this method, selecting the factor 􀅎 􀀀 􀅏 is very important and it should be selected in a way to be strong towards the attenuation changes. In this study, 􀀀 􀀟 0. 4 was adopted to maintain the height error variations. Conclusion As the final result, the C-PolInSAR data can be an efficient strategy due to its performance, when the full polarimetric imaging systems are either limited or not available. Moreover, utilizing these data in long wavelengths (e. g. P band) is more appropriate due to the effect of the Faraday rotation on the transmitted polarization.

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

View 507

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Author(s): 

GHADER SARMAD | ESFAHANIAN V.

Issue Info: 
  • Year: 

    2007
  • Volume: 

    33
  • Issue: 

    1
  • Pages: 

    107-118
Measures: 
  • Citations: 

    0
  • Views: 

    1007
  • Downloads: 

    0
Abstract: 

This paper is devoted to assessing the accuracy of the COMPACT and the super-COMPACT finite difference methods for spatial differencing of the linearized shallow water equations. The second-order centered, the fourth-order centered, the fourth-order COMPACT, the sixth-order COMPACT and the sixth-order super-COMPACT schemes are used to carry out the spatial differencing of the linearized shallow water equations on Arakawa's A and C grids. For the frequency and group velocity of linear inertia gravity waves on different numerical methods, the sixth-order super-COMPACT method shows a substantial improvement on traditional centered and COMPACT finite difference schemes.

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

View 1007

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2013
  • Volume: 

    4
  • Issue: 

    2 (12)
  • Pages: 

    75-85
Measures: 
  • Citations: 

    0
  • Views: 

    261
  • Downloads: 

    88
Abstract: 

The problem of series two-block disjoint decomposition of completely specified Boolean functions is considered. Analysis and investigation of such systems are very important in logical design context. Recently, a good method for solving this problem was suggested which has been based on the ternary matrix cover approach. Using this method a computer program was developed. This paper is focused on decomposability of a system of Boolean functions. The experiments were done on generated systems and standard benchmarks. In decomposable systems, the total number of solutions and the time elapsed to achieve them are inspected. The total number of solutions among all partitions for investigated systems, ranged between 3% and 87% in generated systems and also, 1% and 96% in standard benchmarks.

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

View 261

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 88 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 5
litScript
telegram sharing button
whatsapp sharing button
linkedin sharing button
twitter sharing button
email sharing button
email sharing button
email sharing button
sharethis sharing button