In this research the effect of both calcium carbonate nanoparticles and PP-g-MA ones on impact strength and Young's modulus of Polypropylene (PP) are investigated experimentally. Two kinds of CaC03 nanoparticles (monolayer-coated and uncoated) are used to investigate the effect of surface treatment of nanoparticles on the mechanical properties of these composites. All samples are mixed in a co-rotating twin screw extruder and are formed ninto standard tensile and impact bars using the injection molding method. The effect of surface modification of nanoparticles and presence of PP-g-MA on the dispersion of calcium carbonate nanoparticles in polypropylene matrix are studied by field emission scanning electron microscopy (FESEM). The results show a good agreement between the TGA analysis and the related theory. The results also show that surface modification of calcium carbonate nanoparticles and also the PP-g-MA are affective in improving the distribution and dispersion of nanoparticles in the PP matrix. Increasing of the calcium carbonate nanoparticles improves both the impact strength and the Young's modulus of polypropylene. The more the PP-g-MA is added to PP matrix the more the impact strength of the samples increases and the less their Young's modulus decreases.

MA×MA60 is a sweet cherry semi dwarf rootstock that is easily reproduced through micropropagation and because of the resistance to phytophytora, which is one of the most important factors in the deterioration of stone fruit trees, it is a valuable rootstock. The aim of this study was to investigate the effect of culture media and plant growth regulators on the proliferation and rooting of MA×MA60 rootstock at the Khorasan Razavi Agricultural and Natural Resources Research and Education Center. This experiment was conducted as a factorial in a completely randomized design with 4 replications. At the proliferation stage, the treatments consisted of three culture media (MS, WPM and DKW) and two growth regulators (benzyl amino purine and thiadiazuron) at concentrations of 0, 1 and 2 mgL-1 and at the rooting stage, treatments consisted of three culture media (MS, WPM and DKW) and different concentrations of indole-butyric acid (0, 1, 2 and 3 mgL-1). The results showed that in the proliferation stage, the highest number of shoots (33.6), leaves (20.33) and plantlet quality (3) were recorded in MS medium enriched with 2 mgL-1 of benzyl amino purine, and the shoot length (3.2 cm) in the MS medium enriched with 1 mgL-1 thiadiazuron. The highest rooting percentage (75%) and root number (5.33) were obtained in MS medium enriched with 3 mgL-1 indole buteric acid and DKW enriched with 2 mgL-1 indole buteric acid, respectively. Plantlets successfully adapted to the greenhouse conditions. Survival rate was about 75% in cocopeat and perlite culture.

The aim of the study is to answer the following question: which of the predictive indicators used in this study is the best way for predicting stock price, and is considered as the higher credibility for predicting stock price in the Tehran stock exchange? For this reason it is used the methods of a simple moving average and Weighted moving average and exponential moving average for symbol periods of 30 days, 60 days and 90 days. And then predicted results are compared with the actual price, and finally, various methods have been evaluated by two different indexes consist of Mean Absolute Deviation (MAD) and Tracer Symbol (TS).The results show that the exponential moving average methods for thirty-days period is entitled the highest credibility for predicting stock price.

To begin with, this article takes a brief look at the western concept of economy and how it developed then, it examines the debates and disputes among the economists on the distinction between positive as well as normative economics since its development and in this regard it gives a special emphasis to the role of values and value principles.After that the concept of economy in Islamic texts has been dealt with and it has been concluded that concepts such as scarcity, choice, and scarce resources management which underlie the current definitions of economics can be inferred from them.With regard to Shahid Sadr’s view that there is a distinction between the economics and an economic school of thought and that Islam has an economic school of thought rather than economics, it reflects the same futile distinction between normative and positive. Acknowledging the difference between a school of thought and a science, the article concludes that the economic school of Islam can and should orient the economics and Muslem economists and provide them with the necessary guidelines.

In the present age, it is the age of economic crises and challenges to moral values. Today, with many moral schools, we are faced with the dos and don’ ts of economic activities. On the one hand, the Islamic society needs a dynamic and developed economy, and on the other hand, it needs to consolidate and strengthen moral values in order to bring worldly and otherworldly happiness to people by making their activities healthier and countering economic corruption. The key question that has been dealt with in a descriptive-analytical way is what the moral school is in Islamic economics and conventional economics. The results of the study in this paper show that in the ethical school of conventional economics, the human goal of all activities is to avoid suffering or to attain material pleasure. However, the ethical school in Islamic economics attaches great importance to spirituality and considers the attention to materials to be legitimate to the extent that it does not hinder the spiritual growth and happiness of human beings.

After the modern era and while the post modernity gifts caused changes in life style and human being theory in the twentieth century historical time, the art and literature were modified as well in direction of evolution and completion and based a new method named "Minimalism" so that by utilizing the brevity it becomes able to coordinate itself with dominating quick passage of life. Nowadays, the minimalism is remembered as a new phenomenon appeared from the west culture, while in Iranian classic literature, it is possible to find a plenty of samples which correspond with this literary style. This study will introduce the literary classic works of Iran which incept the specifications of minimalism stories in addition to expressing the minimal concept and characteristics of these stories; it also, will hand over a new outlook concerning the structure of these Iranian stories and ancient narrations.