Preoperative Mechanical Bowel Evacuation Reduces Intraoperative Bleeding and Operation Time in Spinal Surgery

Majid Rezvani,Reza Abbasi,Homayoon Tabesh,Leila Dehghani,Shahaboddin Dolatkhah,Maryam Nasri,Mohsen Kolahdouzan,Rokhsareh Meamar 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.3

Study Design: Randomized clinical trial. Purpose: In this study, we evaluated the effect of mechanical evacuation of the bowels prior to operation on intraoperative bleeding. Overview of Literature: Bleeding is the most significant complication in patients undergoing spinal surgery. Methods: We randomly divided 108 individuals planned to undergo spinal surgery into two age-, sex-, and co-morbidity (especially preoperative hemoglobin [Hb])-matched groups of 54. The treatment group was administered polyethylene glycol (PEG) before the operation, whereas the control group was not. The exact amount (mL) of bleeding during operation, operative time, and approximate amount of blood transfused were recorded. The volume of bleeding and Hb level were also recorded 24 and 48 hours postoperatively. Results: T -tests revealed that intraoperative bleeding, the volume of transfusion, and operative time were significantly lower in the treatment group than in the control group. Statistically significant correlations of intraoperative bleeding with age, body mass index (BMI), preoperative Hb levels, operative time, the volume of transfusion, hospitalization time, and 24- and 48-hour postoperative bleeding were observed (p =0.001, all). Repeated measures analysis of covariance after adjusting the covariate variables revealed that the volume of bleeding showed a near-significant trend in the treatment group compared with that in the control group (p =0.056). Diabetic females had the highest bleeding amount between the groups (p =0.03). Bleeding was higher in patients with higher BMI (p =0.02) and was related to operative time (p =0.001) in both the groups. Conclusions: Preoperative gastrointestinal tract evacuation by PEG administration can decrease intraoperative bleeding in spinal surgeries; however, more research is imperative regarding PEG administration in surgical procedures for this purpose.

An Investigation into Iranian Undergraduate English Students` Perceptions about the Importance and Use of CALL Before and After a Related Course

( Farzaneh Dehghan ),( Reza Rezvani ),( Mohammad Javadi ) 범태평양응용언어학회 2016 범태평양응용언어학회지 Vol.20 No.2

Over the past decades, there has been an increasing tendency to incorporate new technologies in language education. Although EFL students and teachers are accustomed to using new technologies in their everyday life, they may not be well aware of such assets in education. This qualitative study aimed at investigating how Iranian B.A. English students perceived and used new technologies before and after an undergraduate course of CALL. A total of 27 senior students of Yasouj University participated in this study. They were interviewed by one of the researchers before and after the course. Content analysis of the interviews revealed that almost all participants appreciated the course and it had engendered their enthusiasm about CALL potentialities and the new learning options it might offer. The respondents maintained that the course raised their awareness on how CALL could expedite their learning through providing more chances of both oral and written communications with native and non-native speakers of English well beyond the confinements of their traditional EFL classes. Although some participants were anxious about utilizing new technologies, they were favorably inclined towards CALL uses after the course. More specifically, the paper provides insights into the implications of raising university students` awareness about CALL.

Effect of Inverted-V Bracing on Retrofitting Against Progressive Collapse of Steel Moment Resisting Frames

Farshad Hashemi Rezvani,Mohammad Ali Mohammad Taghizadeh,Hamid Reza Ronagh 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.3

The effect of inverted-V bracing on enhancing progressive collapse resistance of steel Moment Resisting Frames (MRF) were investigated in this study. A series of nonlinear static and dynamic analyses were performed to determine the resistance of four generic MRFs retrofitted by ten inverted-V bracing element. These structures were subjected to an exterior column loss and had a different number of stories and span lengths in order to study the effect of these variations on the structural response. Both force-controlled and deformation-controlled actions were implemented to determine if the column loss would lead to a failure progression. Results showed that structural configuration affects the structural resistance against failure progression and hence the appropriate brace element to retrofit it. Also, it was shown that for the studied 4-story frames, by increasing the span length by 20%, the structural resistance decreases by 42% on average. Finally, it was observed that by decreasing the span length, the Dynamic Increase Factor (DIF) suggested by the UFC, will lead to underestimating the required cross-sectional area of the brace for strengthening the unbraced structures.

Chromium(III) Complex Obtained from Dipicolinic Acid: Synthesis, Characterization, X-Ray Crystal Structure and Electrochemical Studies

Ghasemi, Khaled,Rezvani, Ali Reza,Razak, Ibrahim Abdul,Moghimi, Abolghasem,Ghasemi, Fatemeh,Rosli, Mohd Mustaqim Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10

The synthesis, X-ray crystallography, spectroscopic (IR, UV-vis), and electrochemical properties of the title compound, $[H_3O][Cr(dipic)_2][H_3O^+.Cl^-]$ (1), ($H_2dipic$ = 2,6-pyridinedicarboxylic acid), are reported. This complex crystallizes in the monoclinic space group Cc with a = 14.9006(10) ${\AA}$, b = 12.2114(8) ${\AA}$, c = 8.6337(6) ${\AA}$, ${\alpha}=90.00^{\circ}$, ${\beta}=92.7460(10)^{\circ}$, ${\gamma}=90.00^{\circ}$, and V = 1569.16(18) ${\AA}^3$ with Z = 4. The hydrogen bonding and noncovalent interactions play roles in the stabilization of the structure. In order to gain a better understanding of the most important geometrical parameters in the structure of the complex, atoms in molecules (AIM) method at B3LYP/6-31G level of theory has been employed.

The Effect of Shape and Stiffness of Originally Different Marine Soil Grains on Their Contractive and Dilative Behavior

Habib Shahnazari,Hossein Salehzadeh,Reza Rezvani,Yasser Dehnavi 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.4

Laboratory research was conducted to compare the monotonic behavior of two different marine calcareous sands - Hormuz Island(HI) and Bushehr Port (BP) - with siliceous sand named Firoozkuh sand (F). A series of undrained isotropically consolidated triaxialtests was performed on reconstituted specimens of these sands. In this experimental investigation, their contractive and dilativebehaviors were evaluated. The effect of some important parameters, such as relative density and confining pressure on the behaviorof these specimens was studied. To analyze the effect of shape and stiffness (resistance to particle breakage) on the contractive andthe dilative responses of these soils, the influence of axial strain on the crushability of the calcareous soils was assessed. Thereafter,the undrained behavior of the soils was analyzed, using two parameters, which represented a normalized variation of excess porewater pressure in two phases of monotonic triaxial tests. The contractive and dilative behavior of the two different calcareous sandswas compared to the siliceous sand. The results showed that particle shape played a key role in the behavior of soils in contractivephase. However, the shearing response of the used carbonate soils was more affected by particle crushing in dilation.

Chromium(III) Complex Obtained from Dipicolinic Acid: Synthesis, Characterization, X-Ray Crystal Structure and Electrochemical Studies

Khaled Ghasemi,Ali Reza Rezvani,Ibrahim Abdul Razak,Abolghasem Moghimi,Fatemeh Ghasemi,Mohd Mustaqim Rosli 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.10

The synthesis, X-ray crystallography, spectroscopic (IR, UV-vis), and electrochemical properties of the title compound, [H3O][Cr(dipic)2] [H3O+.Cl−] (1), (H2dipic = 2,6-pyridinedicarboxylic acid), are reported. This complex crystallizes in the monoclinic space group Cc with a = 14.9006(10) Å, b = 12.2114(8) Å, c = 8.6337(6) Å, α = 90.00°, β = 92.7460(10)°, γ = 90.00°, and V = 1569.16(18) Å3 with Z = 4. The hydrogen bonding and noncovalent interactions play roles in the stabilization of the structure. In order to gain a better understanding of the most important geometrical parameters in the structure of the complex, atoms in molecules (AIM) method at B3LYP/6-31G level of theory has been employed.

Enhanced adsorption of Acid Red 14 by co-assembled LDH/MWCNTs nanohybrid: Optimization, kinetic and isotherm

Fatemeh Khodam,Zolfaghar Rezvani,Ali Reza Amani-Ghadim 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

We reported a facile strategy for assembling NiCoAl-layered double hydroxide/multi-walled carbonnanotubes (NiCoAl-LDH/MWCNTs) nanohybrid through noncovalent bonds. The assembling process andstructures of exfoliated LDH/CNTs nanohybrid were characterized by scanning electron microscopy(SEM), powder X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared(FT-IR) and specific surface area measurement. The effect of nanohybrid dosage, pH and contact time onthe adsorption process was optimized and modeled. The removal percentage of dye by nanohybrid was65% and the maximum adsorption capacity (qm) was 196.08 mg g 1 at the optimized conditions. Isotherm and kinetic of the adsorption process were investigated.

A 10-year Study of Esophageal Cancer in Guilan Province, Iran: The Guilan Cancer Registry Study (GCRS)

Mansour-Ghanaei, Fariborz,Heidarzadeh, Abtin,Naghipour, Mohammad Reza,Joukar, Farahnaz,Valeshabad, Ali Kord,Fallah, Mohammad-Sadegh,Rezvani, Seyed Mahmoud,Sedigh-Rahimabadi, Massih,Rokhshad, Hasan,Dad Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12

Background: Northern Iran counts as one of the highest prevalence regions for esophageal cancer (EC) worldwide. This study was designed to assess the epidemiologic aspects of EC in north central and northwest Iran over a 10 year period. Materials and Methods: The Guilan cancer registry study (GCRS) is a population-based cancer registry study featuring retrospective (1996-2003) and prospective (2004-2005) phases. A detailed questionnaire based on WHO standards for cancer registratration was applied to gather the required information. Two trained physicians coded information using ICD-O-3 in close coordination with an expert pathologist. Results: A total of 19,936 cases of malignancy (mean age $55.4{\pm}18.0$ years, range: 1-98 years) were registered, including 1,147 cases (670 males, 447 female; mean age: $64.0{\pm}11.5$ years) of EC. In 1996 the male/female ratio among patients with EC was 1.25 which increased to 1.53 in 2005. The lower third of the esophagus still remained the most common site of tumors. The average age-standardized rate (ASR) was 6.9 and 4.1 per $10^5$ men and women, respectively. In 1996, the ASRs were 7.2 and 5.2 per $10^5$ men and women which decreased to 6.9 and 4.1 per $10^5$ in 2004-2005. Squamous cell carcinoma (SCC) was the most prevalent histological subtype of EC accounting over 80% of cases. Conclusions: However the prevalence of adenocarcinoma (ADC) showed an increase to 18.4%. Guilan province may be considered a relatively low incidence region for EC.

Adsorption of semisoft pollutants onto Bi2S3/Ag2S-AC under the influence of ultrasonic waves as external filed

Kheibar Dashtiana,Sima Porhemat,Ali Reza Rezvani,Mehrorang Ghaedi,Mohammad Mehdi Sabzehmeidani 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-

The Bi2S3–Ag2S nanocomposite loaded activated carbon (Bi2S3–Ag2S-AC) as semisoft adsorbent was prepared, characterized by FE-SEM, XRD, EDX and DRS and subsequently was used for simultaneous semisoft adsorption of ponceau-4R (P-4R) and auramine-O (AO) dyes from aqueous solution under ultrasonic waves. The influence of operational parameters such as Bi2S3–Ag2S-AC mass, AO concentration, P-4R concentration, pH and sonication time on ultrasound-assisted semisoft adsorption efficiency was studied by central composite design (CCD). Maximum ultrasound-assisted semisoft adsorption efficiencies of 99.51% and 100% were obtained at optimum conditions set as at: 10.59 mg L−1 AO and 17.59 mg L−1 P-4R, pH 4, 0.015 g of Bi2S3/Ag2S-AC and 3.82 min sonication time. In ANOVA the F-value of 269.51 and 247.84 are evidence for significance of the selected model and the lack-of-fit of P-value (0.7208 and 0.7204) is non-significant, confirming the model are statistically logic, for AO and P-4R, respectively. Results revealed that high amount of pollutants were removed from aquaes solution in presens of ultrasonic waves as external filed in short time. Isotherm studied results showed that the Freundlich and Langmuir model were appropriate to describe the ultrasound assisted semisoft adsorption behaviour of AO and P-4R dyes, respectively. Bi2S3/Ag2S-AC revealed the high ultrasound assisted semisoft adsorption capacity of 202.43 and 191.57 mg g−1, for AO and P4R dyes, respectively. The results showed that pseudo-second-order model is the best model for describe kinetic behavior of the ultrasound assisted semisoft dyes adsorption onto Bi2S3–Ag2S-AC as efficient semisoft adsorbent.

Mechanical Properties of Multiscale Graphene Oxide/Basalt Fiber/Epoxy Composites

Nahid Jamali,Hamed Khosravi,Ali Reza Rezvani,Esmaeil Tohidlou 한국섬유공학회 2019 Fibers and polymers Vol.20 No.1

This work was carried out to study the effects of silane functionalization of graphene oxide (GO) nanoplatelets and their loadings on the mechanical properties of basalt fiber (BF)/epoxy composites. At first, the GO nanoplatelets were organically modified by grafting of N-(3-trimethoxysilylpropyl)ethylenediamine (3-TMSPED) compound. The Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDX), and thermal gravimetric analysis(TGA) results demonstrated that silane compound can be covalently grafted to the surface of GO. The multiscale silanized graphene oxide (SGO)/BF/epoxy composites with various weight percentages of SGO in the matrix (0-0.5 wt.% in the step of 0.1) were fabricated. According to the experimental data, the 0.4 wt.% SGO-filled composite showed the maximum improvement by 18 %, 59 %, and 61 % in the tensile, flexural and compressive strengths of BF/epoxy composite, while the maximum improvement by 46 %, 54 %, and 66 % in the tensile, flexural and compressive moduli, respectively was observed for the 0.5 wt.% SGO-filled composite. Additionally, the SGO was more effective in mechanical property enhancement of fibrous composites in comparison with GO, due to its silane-functionalization. From the fracture surface examination of the specimens, it was found that the incorporation of GO or SGO improved the BF-epoxy interfacial bonding. A theoretical model based on Euler-Bernoulli beam-based method was utilized to predict the compressive properties of composites, which was in an excellent agreement with the experimental data.