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10 results on '"Sayadi, Ali A."'

3. Effectiveness of foamed concrete density and locking patterns on bond strength of galvanized strip

Author

Sayadi, Ali A., Vilches, T. Juan, Neitzert, Thomas R., and Clifton, G. Charles

Subjects
Concrete -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT Density and compressive strength of foamed concrete as an infill material and configuration of embedded components of composite structural assemblies (CSAs) and their interaction significantly affects performance of composite [...]

Published
2016
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4. Strength of bearing area and locking area of galvanized strips in foamed concrete

Author

Sayadi, Ali A., Vilches, T. Juan, Neitzert, Thomas R., and Clifton, G. Charles

Subjects
Steel, Galvanized -- Analysis -- Mechanical properties, Concrete -- Analysis -- Mechanical properties, Strength of materials -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT Bond strength between the infill materials and embedded components of composite structural assemblies (CSAs) significantly affects the performance of sandwich panels. This paper presents the effectiveness of the interlocking [...]

Published
2016
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6. Effective of elastic and inelastic zone on behavior of glass fiber reinforced polymer splice sleeve

Author

Sayadi, Ali A., Rahman, Ahmad B. Abd., Sayadi, Ahmad, Bahmani, M., and Shahryari, L.

Subjects
Concrete -- Analysis -- Mechanical properties, Polymers -- Analysis -- Mechanical properties, Business, Construction and materials industries
Abstract

This paper investigates the significant factors in design of splice sleeve with composite material. Factors such as position of interlocking mechanism, elastic and inelastic length of sleeve considerably affect bond [...]

Published
2015
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7. The relationship between interlocking mechanism and bond strength in elastic and inelastic segment of splice sleeve

Author

Sayadi, Ali A., Rahman, Ahmad Baharuddin Abd., Jumaat, Mohd Zamin Bin, Alengaram, U. Johnson, and Ahmad, Sayadi

Subjects
Steel bars -- Mechanical properties, Elasticity -- Properties -- Analysis, Business, Construction and materials industries
Abstract

ABSTRACT This paper concerns the effect of interlocking mechanism on bond strength of splice sleeves located in the elastic and inelastic segment of splice sleeve. Out of the total of [...]

Published
2014
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10. Evaluation of O6-methylguanine-DNA methyltransferase enzyme expression effect on survival of patients with Grade 4 brain astrocytoma.

Author

Hemati, Simin, Sayadi, Ali, Mahzooni, Parvin, and Sirous, Mehry

Subjects
*BRAIN tumors, *ACADEMIC medical centers, *CHI-squared test, *ENZYMES, *FISHER exact test, *GENE expression, *IMMUNOHISTOCHEMISTRY, *RESEARCH funding, *SURVIVAL, *T-test (Statistics), *PROPORTIONAL hazards models, *DATA analysis software, *DESCRIPTIVE statistics, *KAPLAN-Meier estimator, *KARNOFSKY Performance Status, *LOG-rank test, *PROGNOSIS
Abstract

Background: High-grade astrocytoma (Grade 4) or glioblastoma multiforme (GBM) are deadly brain tumors. New therapies attempt to increase lifetime and quality of life in patients with malignant astrocytoma. O6-methylguanine-DNA methyltransferase (MGMT) enzyme expression may be effective in prognosis and response to treatment of these patients. The aim of this study was assessment of MGMT enzyme expression in patients with astrocytoma Grade 4. Materials and Methods: In this study, 48 patients with GBM that were treated with surgery, chemotherapy and radiotherapy were investigated and followed-up for 47 months for the survival rate. Pathology blocks of patients were examined for MGMT enzyme expression using immunohistochemistry method. Results: The patients were 34 males and 14 females. The ages ranged from 24 to 77 years, with a mean age of 53.52 ± 13.39 years. There was no significant difference between two groups (positive and negative MGMT enzyme expression) in overall survival (median [range] 11.5 [4-30] vs. 13 [5-22], P = 0.9). The results of our study showed that patients although who were undergone near total surgery had higher overall survival than the group of patients who had biopsy only however, it was not significant. Patients who were treated with temozolomide (TMZ) (Temodal, Merck Canada) had significant overall median survival (14.5) more than the patients who were treated with Procarbazine (Roche, Swiss)-Lomustine (Lilly, USA)-Vincristine (Lilly, USA) regimen (8.75) (P < 0.05). Conclusion: O6-methylguanine-DNA methyltransferase enzyme expression had no effect on survival of patients with Grade 4 brain astrocytoma TMZ may increase survival rate. [ABSTRACT FROM AUTHOR]

Published
2014

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