A FIXED POINT THEOREM IN HILBERT C^*-MODULES

Ranjbar, Hasan,Niknam, Asadollah The Kangwon-Kyungki Mathematical Society 2022 한국수학논문집 Vol.30 No.2

Fixed point theory has many useful applications in applied sciences. The object of this paper is to obtain fixed point for continuous self mappings in Hilbert C^*-module with rational conditions.

The Aetiological Role of Human Papillomavirus in Colorectal Carcinoma: An Iranian Population- Based Case Control Study

Ranjbar, Reza,Saberfar, Esmaiel,Shamsaie, Alireza,Ghasemian, Ehsan Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.4

Background: Human papillomavirus (HPV) is one of the most common sexually transmitted infections worldwide and the association between HPV infection and genital cancers has been well established. This study concerned the possible role of HPV infection in colorectal carcinoma (CRC) in the Iranian population. Materials and Methods: We examined 80 tissues obtained from patients with colorectal cancer consisting of 58 colon cancer samples and 22 rectal cancer samples and 80 tissues from patients with unremarkable pathologic changes as matched controls by sex, study center and anatomical sites. HPV infection and genotypes were detected using nested PCR and sequencing methods, respectively. Results: HPV DNA was detected in 5/80 (6.25%) cases including 1 of 22 (4.54%) patients with rectum cancer and 4 of 58 (6.9%) patients with colon cancer and 1/80 (1.25%) of controls. Furthermore, HPV-18 was detected as the most frequent type and we found no significant correlation between prevalence of HPV infection and anatomical sub- sites. Conclusions: Although a causal relation between human papillomavirus and colorectal cancer was not found through this study, analysis of medical records pointed to a possible role for high- risk types of HPV in increasing the potential of aggressiveness in colorectal cancer. This study shows a particular frequency of HPV genotypes in patients with colorectal cancer in Iran. Since HPV vaccines are limited to a few types of virus, using cohort studies in different geographical zones to screen for patterns of HPV infection in different organs might increase the efficacy and optimization of the current vaccines.

Effect of Microstructure on the Mechanical Properties and Fracture Toughness of API X65 Pipeline Steel in the Presence of Hydrogen

Meysam Ranjbar,Reza Miresmaeili,Mohammad Reza Naimi‑Jamal,Majid Mirzaei 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10

This study investigated the influence of microstructure on the mechanical properties and fracture toughness of API X65pipeline steel in the presence of hydrogen. In this study, electrochemical method was used for hydrogen charging and indentationtechnique was applied to obtain the fracture toughness. The results showed that in the presence of hydrogen, elongation(EL%), reduction of area (RA), ductile fracture percentage, and fracture toughness of all microstructures decreased. Themicrostructure of martensite (M) + bainite (B) + ferrite (F), had the highest hydrogen trapping and uptake (Capp) as 8.58 × 10–6 mol cm−3 and the lowest apparent hydrogen diffusivity (Dapp) as 5.68 × 10−10 m2 s−1; thus, the maximum decrements of33% in fracture toughness, 40% in ductile fracture percentage, 47% in RA, and 35% in EL% were observed. However, themicrostructure of ferrite (F) + degenerated perlite (DP) + martensite-austenite micro constituent (M/A), where the lowestvalue of 5.85 × 10–6 mol cm−3 for Cappand the highest value of 8.5 × 10–10 m2 s−1 for Dapphad the minimum decrements as2% in fracture toughness, 10% in ductile fracture percentage, 4% in RA, and 7% in El%. According to the obtained results,depending on the type of microstructures, hydrogen-induced work softening or hardening were observed by decreasing orincreasing the yield stress respectively.

Nano-calcium and its potential to improve ‘Red Delicious’ apple fruit characteristics

Shiva Ranjbar,Asghar Ramezanian,Majid Rahemi 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.1

This study evaluated the effects of preharvest nano-calcium fertilization on quantitative and qualitative characteristics of apple (Malus domestica Borkh. ‘Red Delicious’) fruit. From 70 days after full bloom to 30 days before commercial maturity, calcium chloride (0, 1.5, and 2.0%) and nano-calcium (0, 1.5, and 2.0%) solutions were sprayed on apple trees. This was performed five times during the growing season at 2-week intervals. Fruit weight, density, length (L), diameter (D), and L/D were evaluated at harvest. Additionally, several quality characteristics were measured: fruit firmness, total soluble solids (TSS), titratable acidity (TA), total phenolic content (TPC), total antioxidant activity (TAA), total anthocyanins content, starch content, fiber content, total sugars, and calcium content. The effects of nano-calcium treatment on fruit quality and quantity were more significant than that of conventional calcium chloride. The greatest improvements were obtained using 2.0% nano-calcium. TA, TPC, TAA, fiber, and starch content were significantly increased under the nano-calcium treatment. Compared to the control, TSS, total sugars, and anthocyanin content decreased under the calcium chloride and nano- calcium treatment. Our results support the use of nano-calcium as a promising fertilizer for improving the overall characteristics of apple fruit.

Role of Cultural Traditional Ceremonies in Tourism and Cultures Relations Expansion, Case Study of Kashan

Mohsen Ranjbar 세계문화관광학회 2008 Conference Proceedings Vol.9 No.0

Nowadays, cultural resources are regarded as one of tourism industry expansion resources which are founder of cultural tourism. Importance of cultural tourism is that in terms of nature, people belonging to different cultures of traditional religious groups and those who belong to advanced economic system are gathered leading to considerable effects. Cultural tourism provides opportunities for the people belonging to different cultures to understand each other's culture and find out each other's cultural aspects. Cultural tourism is able to help advance and stabilize intra civilization cultures. Large country of Iran has different cultural landscapes all resulting from thousands of civilization. Kashan Province has a lot of cultural varieties and aspects among central desert regions of Iran. Rose water extraction and plant juice production ceremonies, Rose water extraction Ghamsar ceremonies, Mashahd Ardehal carpet washers and unique carpet weaving in Joshghan and the entire region of Kashan are rooted in culture of this region which attracts thousands of people to the said special ceremonies. In the present article, the writer knows cultural tourism of Iran as a way of cultural expansion of the societies and cultural relations and international peace and tries to study its role in cultural unity and expansion of region by introducing cultural tourism charismas.

Vaginal Laser Therapy for Stress Urinary Incontinence: A Systematic Review of Prospective Randomized Clinical Trials

Amene Ranjbar,Vahid Mehrnoush,Fatemeh Darsareh,Ahmed Kotb,Ahmed Zakaria,Mitra Shekari,Malihe Shirzadfard Jahromi 대한폐경학회 2022 대한폐경학회지 Vol.28 No.3

The most common type of urinary incontinence in women is stress urinary incontinence (SUI) which negatively impacts several aspects of life. The newly introduced vaginal laser therapy is being considered for treating SUI. This systematic review aimed to evaluate the efficacy of vaginal laser therapy for stress urinary incontinence in menopausal women. We searched the following databases: MEDLINE (via PubMed), EMBASE, Cochrane Library databases, Web of Science, clinical trial registry platforms, and Google Scholar, using the MeSH terms and keywords [Urinary Incontinence, Stress] and [(lasers) OR laser]. In our systematic review, prospective randomized clinical studies on women diagnosed with SUI as per the International Continence Society’s diagnostic criteria were included. The Cochrane Risk-of-Bias assessment tool for randomized clinical trials was used to evaluate the quality of studies. A total of 256 relevant records in literature databases and registers and 25 in additional searches were found. Following a review of the titles, abstracts, and full texts, four studies involving 431 patients were included. Three studies used CO2-lasers, and one used Erbium: YAG-laser. The results of all four studies revealed the short-term improvement of SUI following both the Erbium: YAG-laser and CO2-laser therapy. SUI treatment with CO2-laser and Erbium: YAG-laser therapy is a quick, intuitive, well-tolerated procedure that successfully improves incontinence-related symptoms. The long-term impact of such interventions has not been well established as most trials focused on the short-term effects.

The Effects of Intra-operative Suggestions on Post-operative Recovery of Patients Undergoing Elective Cesarean Section

Khadijeh Ranjbar,Zahra Dehbozorgi 한국간호과학회 2007 한국간호과학회 학술대회 Vol.2007 No.11

Rejuvenating Silk Road‘s Route as a Symbol of Civilization and its Role in Sustainable Tourism

Mohsen Ranjbar,Rahim Sarvar 세계문화관광학회 2010 Conference Proceedings Vol.11 No.0

Silk road which is formed by the complete connection road networks by making its way through Eurasia over the centuries has been seeking regulatory functions and various political, social, cultural, artistic, religious and commercial and…..Silk road route as a historical complex phenomenon has been included in almost all factors to preserve the human race. For thousands of years Silk Road has not only opened a brilliant page in global history, but has a deep effect and an active functional role in expanding relations between counties in the future. This road which has had a long experience and has been linking people, demonstrates that humans have never confined themselves in their racial fences, ethnicity and geographical locations and have endured long hard roads. This road has been the passage way for cultures, different dialects, nationalities, cultures that have had a long history on earth. Countries located in the route of silk- road, create a main cultural intersection that the richest and most extensive heritages are located. These live and historical heritages have created tourism main attractions. Reviewing connecting old patterns in Silk Road and rebuilding its historical fiber, not only guarantees its preservation and maintenance, but ensures the survival of areas traditions and prospers tourism and placed in this path will be as a symbol and enigma. Silk-road in Iran is entered as an eastern-western axis to khorasan and from that route arrive at Toos, Neishabour, sabzavar, shah rood, damghan, semnan to ray and from ray which was a big city go to ghazvin and from there was divided into two branches. From ghazvin one way to the northwest meaning to sarab, Tabriz, marand and then khoy and then departed Iran and from the other to the west meaning to Hegmataneh (Hamadan today) then to Kermanshah and then depart Iran. Today revival and rejuvenation of Silk Road only historical commemoration is left and along this road could be very interesting to tourists. Other important points that we should now is that Iran is the only country that the terrestrial and marine silk road meet at the Persian Gulf. In this article it has been tried to in addition to identifying the strengths of this important historical cultural road, solutions for its revival for the purpose of regenerating the tourism markets have been presented.

Numerical fluid structural interface analysis in condenser microphone design

Akbar Ranjbar,Mohammad-Ali Saeimi-Sadigh,Bashir Behjat 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.3

Condenser microphones are widely used in electronic and acoustic applications. Although, various mechanical and electro-mechanical methods have been developed to design and analyze these sensors. However, due to the difficulty of fluid-structural-electrical couplings,none of them can introduce a method that consider all parameters of the design together. This research concerns the effects of four main parameters: a) Air gap size; b) Number of holes on the back-plate; c) holes radius size and d) location of the holes in back plate, on the response of the microphones. This analysis have been carried out based on coupled finite element and finite volume method using ANSYS-CFX software to simulate fluid-structure interaction between the diaphragm and air in the air-gap region. By using this method,the effects of the geometric parameters on the response of the microphone have been investigated. Results show that, increasing air gap size, holes radius, and holes number decrease the damping effects of the air between diaphragm and back plate. On the other hand, increasing the distance between the holes has the opposite effect. In addition, results reveal that among these four parameters, increasing the number of holes on back plate is the most efficient method in reducing air-gap damping effects.

Fabrication and Characterization of Antibacterial Suture Yarns Containing PLA/Tetracycline Hydrochloride-PVA/Chitosan Nanofibers

Marziyeh Ranjbar-Mohammadi,Vida Sa’di,Meysam Moezzi,Reza Saghafi 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6

Antibacterial suture yarns containing antibiotic drugs can play an important role in preventing the infection andholding tissues together to achieve wound closure. In this research, the possibility of production drug loaded nano yarns froma mixture of chitosan/polyvinyl alcohol (PVA/CS) (70:30) and poly(lactic acid) (PLA) was assessed by combiningdual‐electrospinning technique with aligned fibers collection. For this, CS/PVA solution was injected from one syringe andPLA from another one. The effect of weight ratio of PLA-PVA/CS (100:0, 80:20 and 60:40), collector speed (500, 800,1100 rpm) and voltage (10, 15 and 20 kV) on the diameter and morphology of fabricated nanofibers was assessed. Fabricatednanofibers with the length of 70 cm were twisted for manufacturing suture yarns. The results showed that fabrication ofstructure with the finest diameter was possible with the weight ratio of PLA-PVA/CS (60:40), the applied voltage of 15 kV,spinning distance of 17 cm and the rotational speed of about 1100 rpm. The diameter of produced nanofibers in this conditionwas about 290±42 nm. Then, tetracycline hydrochloride (T) loaded PLA-PVA/CS nanofibers (PLA/T-PVA/CS) wereproduced with optimum condition and the drug (5 wt. %) was loaded in PLA solution. FTIR analysis of drug loaded yarnexhibited the most important functional groups of chitosan, PVA, tetracycline hydrochloride and PLA in PLA-PVA/CSstructure. Contact angle data for PLA-PVA/CS and PLA/T-PVA/CS was about 89±3 ° and 30±2 °, respectively. The result ofthe antibacterial test indicated that the PLA/T-PVA/CS nanofibrous yarns were the most suitable sample with the prominentantibacterial activity against both gram-positive bacterium Staphylococcus aureus and gram-negative bacterium Escherichiacoli with inhibition zones of 17.5 and 20 mm, respectively. It seems that the fabricated nanofiber based yarns with suitablemorphological characteristics, hydrophilicity nature, and prevention of the surgical infections without affecting the cellviability can be an excellent structure for utilization as suture yarn.