Progressive collapse studies generally assess the performance of the structure under gravity and blast loads, while earthquakes may also lead to the progressive collapse of a damaged structure. In this study, the progressive collapse response of concentrically braced dual systems with steel moment-resisting frames was assessed under seismic loads through pushover analysis using triangular and uniform lateral load patterns. Two Different bracing types (X and inverted V braces) were considered, and their performances were compared under Different lateral load patterns using the nonlinear static alternate path method recommended in the Unified Facilities Criteria (UFC) guideline. Eventually, the seismic progressive collapse resistance of Models was compared to their progressive collapse response under gravity loads. These studies showed that Models under the seismic progressive collapse loads satisfied UFC acceptance criteria and limited rehabilitation objective. The structures had better performance under seismic progressive collapse than Models under gravity loads because of more resistance, ductility, suitable load redistribution, and more structural elements that participated in load redistribution. Furthermore, despite studies on progressive collapse under gravity loads, the dual system with X braces showed better progressive collapse performance (more resistance, residual reserve strength ratio and ductility) under seismic loads than the model with inverted V braces.

The aim of this study was to investigate the effect of using portulaca oleracea as a source of plant antioxidants for feeding fattening male lambs, on carcass traits, meat quality, and oxidative stability. Twenty-one male lambs with an average weight of 24±1.5 kg and 150±15 days old were fed with one of the experimental rations included a diet without portulaca oleracea as control, a diet containing 7.5%, and a diet containing 15% portulaca oleracea, for 84 days. The muscle (Longissimus dorsi) samplewas used to determine pH, chemical composition, colorimetric properties, and oxidative stability of meat. Meat lipid oxidation was determined after 1, 7, and 30 days of refrigerated storage using thiobarbituric acid (TBARS). The use of portulaca oleracea in diets improved meat color characteristics such as L, chroma, and Hue. The highest ash concentration and the lowest meat moisture were observed in the treatment of 15% portulaca oleracea (P<0.05). Meat pH was the lowest in the first hour after slaughter but did not differ at 24 h. Compared to the control, in both treatment groups feeding the lambs with portulaca significantly reduced the concentration of Malondialdehyde in the meat of the lambs and increased the meat oxidative stability (P<0.05). The results of this experiment showed that feeding portulaca oleracea by improving properties such as color and increasing the meat oxidative stability improves meat quality, which may have lead to an increase in its nutritional value in terms of human health.

Evaluating the cutting rate (CR) of stones is important in the cost estimation and the planning of the stone processing plants. This research used regression Models to estimate the stones’ CR based on their physico-mechanical characteristics. Stone processing factories in Mahallat City (Markazi province, Iran) were visited, and the CR of diamond circular saws was recorded on six Different travertine stones. Next, the stone block samples were collected from the quarries for laboratory tests. Stones’ porosity (n), uniaxial compressive strength (UCS), and Schmidt hammer hardness (SH) were determined in the laboratory as their physico-mechanical characteristics. Correlation relationships of CR with physico-mechanical characteristics were evaluated using simple and multiple regression analyses, and estimator Models were developed. Results showed that multiple regression Models are more reliable than simple regression for estimating the stones’ CR. The validity of the developed multiple regression Models was verified with the published data of one researcher. The findings indicated that these Models are accurate enough for estimating the CR of stones. Consequently, the multiple regression Models provide practical advantages for estimating the CR and save time and cost during the planning and design of the stone processing factories.

Air conditioning systems are used in industries and residential environments with the aim of improving environmental conditions and creating a comfortable temperature for users. Considering the production of sound and vibration in most of its components, the lack of control of the production sound level always exposes the users to unwanted sound, which in addition to hearing complications, also causes fatigue and dissatisfaction with the environmental conditions. . Compressors are one of the most important sources of sound production in air conditioning systems, and screw compressors are one of the most widely used in air conditioning industries. Therefore, the compressor shell should be designed to minimize the transmission of sound from inside to outside. Since the maximum working temperature of compressors is up to 80 degrees Celsius, therefore, in this research, an acoustic test was performed on a sample of a screw compressor shell in two modes of ambient temperature and maximum working temperature inside the acoustic room, and the effect of temperature increase on the sound pressure level. transferred from the shell to the external environment is discussed. Finally, based on the frequency analysis performed in two conditions of ambient temperature and maximum working temperature and comparing the amount of sound transmitted to the environment at Different Frequencies, practical solutions to reduce the amount of transmitted sound pressure have been presented.

Milk thistle (Silybum marianum (L.) Gaertn) belonging to the Asteraceae family and known for its valuable secondary metabolite, silymarin. In order to get the cell suspension culture of Silybum marianum, the combination of 2,4-D and BAP hormones each with five Different concentrations (0, 0.1, 1, 2 and 5 mg/L) and 3 Different seedling explants (cotyledon, hypocotyl and root) was used to callus formation. High-quality callus was observed in eight Different of hormone-explant combinations. Successful cell suspension culture was achieved only by using callus created from cotyledon explants treated with 0.1 mg/L 2,4-D and 5 mg/L BAP. Furthermore, the study examined the effects of 2% and 4% Serendipita indica cell wall extract as an elicitor on silymarin production in cell suspension culture at three Different inoculation times (24, 48, and 72 h). After 48 h of inoculation with 2% fungal extract, the highest level of silymarin (199 ppm) was observed, which was significantly Different from the control (46 ppm). The silymarin content of cells increased over time through elicitation with 4% fungal elicitor, while no similar pattern was observed with 2% fungal extract. Based on the results, the cell wall of S. indica can significantly enhance the amount of SLM in the cell suspension culture of S. marianum.

Considering the importance of solidarity as a theoretical and political structure and its connection with social harmony, acceptability and political legitimacy, the present research has conceptualized and formulated the problem of solidarity in the context of Iran's multi-ethnic society through the mediation of existing studies. . In the current research, the hybrid method has been used. The sample and statistical population of the research includes selected qualitative studies that have investigated the issue of solidarity and its dimensions in Iran from Different aspects and perspectives in the period from 1372 to 1398. After searching in Different databases, 500 related articles, books and research reports were identified and finally 54 sources were selected to perform the meta-combination method. Based on the synthesis of studies, solidarity in the multi-ethnic society of Iran has found a problematic situation. The results of the research confirm that the coordinates of solidarity in Iranian society are based on structural contexts and conditions. The main field in which the issue of solidarity in Iran should be established is the acceptance of a reality called "reliability and stability of cultural diversity". Based on the meta-combination of studies, the coordinates of solidarity in Iran's multi-ethnic society, due to "intercultural affinities", "disruption and non-inclusion in ethnic policies", "instability and imbalance of development", "inefficiency of ethnic political management" and "identification disorder". In the meantime, "cultural globalization", "taking role Models from ethnic elites", "geopolitics of ethnic areas and transnational interventions" and "ethnic extension" are considered as intervening conditions. Despite the fact that ethnic and religious diversity is recognized as a central sign in the constitution, with this definition, political agents have sometimes resorted to strategies that social suffering and extroversion has formed in ethnic communities.

1هدف و زمینه: نوسانات بازار مالی به عنوان یکی از ابزار های کنترل اقتصاد در نظام های اقتصادی هستند. درک درست از چگونگی تاثیر این شوک ها بر نظام اقتصادی، راهنمایی خوب برای تعیین سیاست های مناسب برای اثرگذاری بر دیگر متغیر های کلان اقتصادی است. روش: برای این منظور در مطالعه حاضر به بررسی رابطه مابین بنیان های اقتصاد کلان و نوسانات بازار مالی در ایران با استفاده از روش الگوی داده های ترکیبی با تواتر متفاوت (میداس) برای بازه زمانی متفاوت فصلی و سالانه پرداخته شد. یافته ها: در الگوی برآورد شده از داده­های سالانه درجه باز بودن تجاری، مخارج دولت، بهره وری، نرخ تورم و نرخ بهره و داده­های فصلی نوسانات قیمت نفت، نوسانات نرخ ارز و حجم پول برای سال­های 1398-1370 استفاده شده است. اطلاعات مربوط به سال 1399 در برآورد اولیه رابطه استفاده نشد تا بتوان قدرت پیش بینی الگو را خارج از محدوده برآورد، محک زد. براساس نتایج، نرخ تورم، حجم پول، نرخ سود حقیقی و نوسانات قیمت نفت خام تاثیر مثبت و درجه باز بودن تجاری تاثیر منفی بر نوسانات بازار ارز دارد. اثرگذاری نوسانات پولی و نفتی در اقتصاد ایران بیشتر به وضعیت تورمی مورد مطالعه بستگی دارد، به گونه ای که با افزایش میزان تورم، تاثیر نوسانات پولی بر بخش حقیقی اقتصاد کاهش می یابد و حتی در سطوح بسیار بالای تورم می تواند اثر منفی داشته باشد. نتیجه گیری: برای اقتصاد ایران با افزایش قیمت نفت، بخاطر استفاده از مواد اولیه وارداتی در بخش تولید، سطح تورم افزایش می یابد و این افزایش تورم منجر به افزایش نرخ سود تسهیلات اعطایی بانک ها شده و هزینه گرفتن وام بالا رفته و سطح سرمایه گذاری در بخش های صنعتی و تولیدی را کاهش می دهد و در نهایت منجر به افزایش نوسانات بازار ارز می شود. همچنین با مقایسه مقادیر پیش بینی شده با مقادیر محقق شده و اضافه کردن فصول دوم، سوم و چهارم به مدل، دقت پیش بینی مدل بالا تر رفته و به مقادیر واقعی نزدیک تر می شود.