در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: International Journal of Mining and Geo-Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Analytical solution,Physical Modeling,Case Study,blocky-flexure toppling failure
- چکیده:
- چکیده انگلیسی: Block-flexure is the most common mode of toppling failure in natural and excavated rock slopes. In such failure, some rock blocks break due to tensile stresses and some overturn under their own weights and then all of them topple together. In this paper, first, a brief review of previous studies on toppling failures is presented. Then, the physical and mechanical properties of experimental modeling materials are summarized. Next, the physical modeling results of rock slopes with the potential of block-flexural toppling failures are explained and a new analytical solution is proposed for the stability analysis of such slopes. The results of this method are compared with the outcomes of the experiments. The comparative studies show that the proposed analytical approach is appropriate for the stability analysis of rock slopes against block-flexure toppling failure. Finally, a real case study is used for the practical verification of the suggested method.
- انتشار مقاله: 16-06-1394
- نویسندگان: Mehdi Amini,Mohammad Golamzadeh,Mohammad Khosravi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Travel Medicine and Global Health
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,Prevalence,Ovarian Cancer,Gynecology
- چکیده:
- چکیده انگلیسی: Introduction: Involving approximately 4% of malignancies in women, ovarian cancer remains one of the most fatal cancers. However, it is important to consider conditions which are not primary ovarian diseases, but mimic their behaviors. In the present study, the epidemiological characteristics of extra-ovarian conditions mimicking ovarian masses are evaluated.
Methods: This cross-sectional study was conducted on patients with a primary diagnosis of ovarian mass who underwent surgery by gynecologists between January 2012 and March 2016. The surgeon’s primary diagnosis and the final histopathology assessment report were evaluated for each patient. In cases where the final histopathology report was not in the spectrum of gynecologic pathology, possible reasons for incompatibility were investigated.
Results: Ultimately, 1876 patients with a mean age of 48.26±15.4 years underwent analysis. Among these patients, 27 (1.4%) had masses of a non-gynecologic origin. The final diagnoses were divided into four main categories: masses with a gastrointestinal origin (55.5%), infectious (18.5%), those with a retroperitoneal origin (18.5%), and embryologic-origin masses (7.4%).
Conclusion: The results suggest that extra-ovarian diseases should be considered in differential diagnoses of patients with a primary diagnosis of ovarian cancer. Furthermore, it was found that metastases from gastrointestinal tract tumors and infectious diseases are the most common pathologies among extra-ovarian conditions.- انتشار مقاله: 17-02-1397
- نویسندگان: Seyedeh Razieh Hashemi,Mohammad Hossein Khosravi,Mohammad Ali Hosseini,Rezvan Ashkesh,Afsaneh Lalooei
- مشاهده
- جایگاه : پژوهشی
- مجله: Geotechnical Geology
- نوع مقاله: Journal Article
- کلمات کلیدی: Central frequency,Kanai-Tajimi,Power Spectral Density,Resonance frequency,Shape factor
- چکیده:
- چکیده انگلیسی: Considering the importance of the resonance phenomenon in buildings and the numbers in the
world of this phenomenon and the fact that this phenomenon isn't considered yet in Kerman province, in this paper the earthquake resonance frequency range is calculated for the regions of Golbaf and Sirch, located in Kerman province, using 23 records of earthquakes that happened between 1981 and 2000. The results have been generalized for the whole province. After providing above accelerograms, a program has been written for the calculating power spectra and its smoothed curve, based on Canai-Tajimi model and its correctness checked by comparing available power spectra. The program read records respectively, and at first it calculated and exhibited total energy and power of earthquake at the end of ground motion in any frequency between zero and 25 hertz, and finally exhibited smoothed power spectra model assuming linear relationship with two neighbor points of accelerograms and direct solving of movement equations. Through all accelerograms 18 records were related to Golbaf and 5 records were related to Sirch and all of them had maximum acceleration of more than 0.05g.Resonance frequency range has been specified by earning the amount of central frequency and shape factor parameters for all the records. This range was calculated between 3.43 and 8.76 hertz. By generalization of the calculated result, to the whole province, one can say that the structures which have a main frequency range of 3.43 to 8.76 hertz increase the damage of the earthquakes. Therefore, in structural designing, the main frequency of that range should be avoided by changing the structural mass or rigidity.- انتشار مقاله: 02-07-1399
- نویسندگان: Mohammadreza Khosravi Mashizi,Mohammadreza Khosravi Mashizi,Mohammadreza Khosravi Mashizi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Optimization
- نوع مقاله: Journal Article
- کلمات کلیدی: Performance Evaluation,Efficiency,Network data envelopment analysis,Iran's Electricity Industry,Regional Electricity Company
- چکیده: ایـن مطالعـه یـک مطالعـه کاربردی اسـت که بـه منظور بررسـی و مقایسـه کارایی شـرکتهای برق منطقهای ایران با اسـتفاده از روشهای تحلیل پوششـی دادههای مرسـوم و شـبکیه انجام شـده اسـت. شـرکتهای بـرق منطقـهای ایـران از فرایند دو مرحلـهای بـرای انتقـال نیـرو اسـتفاده میکنند. با اسـتفاده از رویکـرد کاربردی، عملکـرد و کارایـی ایـن شـرکتها بـا روشهـای شـبکهای و مرسـوم اندازهگیری شـد و با یکدیگر مقایسـه شـد. (BCC ورودی-محور). مشـخص شـد که مدلهای شـبکه در مقایسـه بـا روشهـای دیگـر از آنجـا کـه تصویـر واضـح از کارایـی شـرکتهای بـرق منطقـهای را فراهـم میکنـد ،گسـتردهتر هسـتند. نتایـج آزمـون ویلکاکسـون نشـان میدهـد کـه بیـن نمـرات کارآیی شـرکتهای بـرق منطقهای ایـران بـا اسـتفاده ازروش BCC و روشهای شـبکه تفـاوت معناداری وجـود دارد و بررسـی کیفیـت تفـاوت نمـرات نیـز نشـان میدهد کـه کارایـی شـرکتها در مدل شـبکه پایینتـر از نمـرات کارایـی مدل BCC اسـت. به طور کلی، مدلهای شـبکه دارای کاربـرد بالاتـری نسـبت بـه ارائـه یـک تصویر واضـح از کارایی شـرکتهای بـرق منطقـهای و مقایسـه دقیقتر آنها هسـتند.
- چکیده انگلیسی: This study is an applied study conducted to evaluate and compare the efficiency of Iran's regional power companies using conventional and network Data Envelopment Analysis methods. Iran's regional power companies use two- phased process to transmit power. Using applied approach, the performance and efficiency of these companies were measured with network and conventional methods, and they were compared with each other (input-oriented BCC). It was indicated that network models have wider application compared with other method since it provides vivid picture of the efficiency of regional power companies. The Wilcoxon test result shows there is significant difference between efficiency scores of Iran's regional power companies using BCC and network methods, and investigation of the quality of difference of scores also indicate that efficiency of companies in the network model is lower than efficiency scores of BCC model. In general, network models have higher application than to provide a vivid picture of the efficiency of regional electricity companies and more accurate comparison of them.
- انتشار مقاله: 30-01-1396
- نویسندگان: Kambiz Shahroodi,Mohammad Reza Khosravi
- مشاهده
- جایگاه : پژوهشی
- مجله: Canon Journal of Medicine
- نوع مقاله: Journal Article
- کلمات کلیدی: Prevalence,Thyroidectomy,Complications,etiology
- چکیده:
- چکیده انگلیسی: Introduction: Thyroidectomy is one of the most prevalent performed surgeries worldwide by a variety of trained surgeons in various fields. Risk and complications of thyroidectomy is depended on indication and extent of surgery, number of thyroidectomies performed in a center and surgeon’s experience to a wide extent. We aimed to determine indications and prevalence of immediate post-surgical thyroidectomy complications at Baqiyatallah University hospital, Tehran, Iran.
Methods: In this cross-sectional study we retrospectively reviewed profile of patients who underwent conventional (transcervical) thyroidectomy between March 2017 and March 2018. Demographic information as well as surgical indication, primary impression, Fine-needle aspiration results, method of thyroid surgery, weight of extracted specimen, final pathology result, duration of surgery, duration of hospitalization and immediate post-surgical complications were recorded in a predesigned checklist. Information on complications was extracted from physician’s progress note and nursing assessment sheets.
Results: Eventually 117 (91 female and 15 male) patients with a mean age of 46±13 years underwent analysis. Multinodular goiter (MNG) was the most frequent (57%) primary impression of the study individuals. Total thyroidectomy was the most prevalent type of thyroidectomy surgery among study individuals with 47(43%) patients followed by subtotal thyroidectomy with 37 (34%) cases. Nausea was the most frequent complication with 14 (13.1%) patients followed by hypocalcaemia (5.12%) and surgery site bleeding (3.41%).
Conclusion: Findings of the present study showed that multinodular goiter is the most prevalent cause of thyroidectomy. Nausea was the most prevalent complication of surgery followed by hypocalcemia and bleeding.- انتشار مقاله: 23-10-1397
- نویسندگان: Shahriar Najafizadeh-Sari,Mohammad Hossein Khosravi,Hassanali Mohebbi
- مشاهده
- جایگاه : پژوهشی
- مجله: Canon Journal of Medicine
- نوع مقاله: Journal Article
- کلمات کلیدی: premature infant,Abdominal Massage,Gastric Residual Volume,Weight gain
- چکیده:
- چکیده انگلیسی: Introduction: One of the most important problems of premature infants and main reason of hospitalization in neonatal intensive care unit (NICU) is their low birth weight. They need gavage for feeding which has several side effects. Thus choosing appropriate nutritional interventions in premature infants decreases gavage-related complications and results in lower duration of hospitalization.
Methods: In this clinical trial study premature infants were randomly allocated to two intervention and control groups. Both groups underwent routine care. Intervention group infants received abdominal massage 15 minutes twice a day for five days by a trained physiotherapist using moisturizing lotion based on the method described in previous studies.
Results: Eventually 28 infants (15 male and 13 female) with a mean gestational age of 32.43±1.16 weeks in intervention and 33±0.88 weeks in control group underwent analysis (p=0.15). Mean gastric residual volume was 0.71±1.13 ml in intervention and 1.43±1.55 ml in control group prior to intervention (p=0.2). It was 1.93±2.43 ml in intervention and 4.71±4.25 ml in control group in the fifth day of intervention (p=0.04). Before intervention, mean weight was 1830±330 gr in intervention and 1870±370 gr in control group (p=0.82). In the fifth day of intervention mean weight was 1871±323.15 gr in intervention group and 1767±347.24 gr in control group (p=0.001).
Conclusion: In conclusion our findings suggest that abdominal massage efficiently decreases gastric residual volume and helps with weight gain in preterm infants.- انتشار مقاله: 31-01-1398
- نویسندگان: Mahboobeh Ghasemi,Bita Najafian,Mohammad Hossein Khosravi,Mehrandokht Nekavand
- مشاهده
- جایگاه : پژوهشی
- مجله: Canon Journal of Medicine
- نوع مقاله: Journal Article
- کلمات کلیدی: Prevalence,Thyroidectomy,Complications,etiology
- چکیده:
- چکیده انگلیسی: Introduction: Thyroidectomy is one of the most prevalent performed surgeries worldwide by a variety of trained surgeons in various fields. Risk and complications of thyroidectomy is depended on indication and extent of surgery, number of thyroidectomies performed in a center and surgeon’s experience to a wide extent. We aimed to determine indications and prevalence of immediate post-surgical thyroidectomy complications at Baqiyatallah University hospital, Tehran, Iran.
Methods: In this cross-sectional study we retrospectively reviewed profile of patients who underwent conventional (transcervical) thyroidectomy between March 2017 and March 2018. Demographic information as well as surgical indication, primary impression, Fine-needle aspiration results, method of thyroid surgery, weight of extracted specimen, final pathology result, duration of surgery, duration of hospitalization and immediate post-surgical complications were recorded in a predesigned checklist. Information on complications was extracted from physician’s progress note and nursing assessment sheets.
Results: Eventually 117 (91 female and 15 male) patients with a mean age of 46±13 years underwent analysis. Multinodular goiter (MNG) was the most frequent (57%) primary impression of the study individuals. Total thyroidectomy was the most prevalent type of thyroidectomy surgery among study individuals with 47(43%) patients followed by subtotal thyroidectomy with 37 (34%) cases. Nausea was the most frequent complication with 14 (13.1%) patients followed by hypocalcaemia (5.12%) and surgery site bleeding (3.41%).
Conclusion: Findings of the present study showed that multinodular goiter is the most prevalent cause of thyroidectomy. Nausea was the most prevalent complication of surgery followed by hypocalcemia and bleeding.- انتشار مقاله: 23-10-1397
- نویسندگان: Shahriar Najafizadeh-Sari,Mohammad Hossein Khosravi,Hassanali Mohebbi
- مشاهده
- جایگاه : پژوهشی
- مجله: Asia Pacific Journal of Medical Toxicology
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی:
- انتشار مقاله: 10-01-1395
- نویسندگان: Zohreh Hosseini,Masoud Ghorbanpoor,Mohammad Khosravi,Mansour Mayahi
- مشاهده
- جایگاه : پژوهشی
- مجله: Annals of Optimization Theory and Practice
- نوع مقاله: Journal Article
- کلمات کلیدی: Patterns of World Trade,National Power,economic factors
- چکیده:
- چکیده انگلیسی: There have been numerous attempts by experts to measure countries' power. The results of the research indicate that one of the most important indicators affecting national power is the economic factor. A survey of the empowering parameters of many powers in the world shows that economic prosperity, national production, and industries export are among the most important reasons for empowering a number of countries. Therefore, in order to plan for the promotion of the national status and power of the country, it is necessary to examine the factors affecting the economic factor and patterns of world economic trade. So studying the trends of the world economy and its influential resources in order to plan for optimal management of resources and planning necessary to increase the economic and defense power of the country is necessary. In this regard, the current research examines the patterns of world economic trade, transport, and infrastructure, water, and their interactions.
- انتشار مقاله: 19-08-1398
- نویسندگان: Hojjat Allah Ebadizadeh,Behzad Gholizadeh,Mohammadreza Khosravi
- مشاهده
- جایگاه : پژوهشی
- مجله: Archives of Razi Institute
- نوع مقاله: Journal Article
- کلمات کلیدی: Mesobuthus eupeus,Venom,Chicken,Pathology,Hematology
- چکیده:
- چکیده انگلیسی: This study aimed to evaluate the clinical, histopathological and hematological effects of Mesobuthus eupeus venom on chicken organs. Adult chickens were subcutaneously injected with five doses of M. eupeus venom (0.5, 2, 5, 10 and 20 mg/kg; four chickens per each dose). Symptoms were recorded during the experiment and blood samples were collected for hematological analysis. Moreover, a complete necropsy was performed. After macroscopic examination, tissue samples were obtained from the liver, kidneys, heart, lungs, intestines and brain of the chickens three days after venom administration. In intravenous injection, lethal dose of the venom was determined at 15 mg/kg. The first clinical, pathological and hematological symptoms in envenomated chickens were observed at M. eupeus doses of 2, 5 and 0.5 mg/kg, respectively. Hematological examination revealed a reduction in lymphocyte count following experimental envenomation, which returned to the pre-experiment level in almost all the cases. On the other hand, heterophil count was found to increase during the experimental period. In addition, erythrocyte count and hematocrit level were stable at all the intervals. Pathological examination was indicative of severe pulmonary hemorrhage, pulmonary and cerebral edema, tubular necrosis of the kidneys, hemorrhage in kidneys and heart, hyaline thrombus and congestion of the liver. According to the results of this study, poultry are resistant to the toxic effects of M. eupeus venom.
- انتشار مقاله: 23-10-1394
- نویسندگان: Mohammad Khosravi,Mansour Mayahi,Seyedeh Missagh Jalali,Anahita Rezaie,Ahmad Taghavi Moghadam,Zohreh Hosseini,Seyedeh Kolsum Barzegar,Somayeh Azadmanesh
- مشاهده