dryopteris expansa (c.pres l.) fraser- jenkins & jermy is reported at the first time for fern flora of iranfrom pice-son forests, asalem to khalkhal road in the hyrcanian phytogeographia region. it's most distinctivemorphological character is the presence of rachis, white petiole, three pinnate lamina, rectangular pinnules,scales with darker band in the middle part. dryopteris expansa is s...

aims: as a talented and educated groups, university students have a critical role in country, thus, their mental health has an especial importance in learning. the present study aimed to evaluate the relationship between internet addiction disorder and mental health among university students of medical sciences in khalkhal. instrument & methods: as a descriptive-analytical research, this study ...

drought affects on all aspects of human actirities seriously as a climatic phenomenon. however, the studies related to this phenomenon based on suitable method are very few. studying the drought features and its prediction can be effective on decreasing of resulted losses or damages. therefore, drought and evaluation of its prediction possibility are studied for some stations of ardabil provinc...

The present study was conducted to investigate the factors influencing ethnic solidarity among young people (18-30 years) in the Azeri regions of Khalkhal. Theoretical framework was presented using the theories Emile Durkheim, Ted Robert Gurr, George Homans, Anthony Giddens and others. The research method was survey, face validity was used and reliability was obtained by Cronbach's alpha coeffi...

Introduction: The present study investigated one of these types of disease (skin cancer) and its relationship with climatic parameters. The aim of this study was to investigate the relationship between climate change and skin cancer in Ardabil province. Materials and Methods: This descriptive correlational study was conducted to investigate the effect of six climatic parameters (frost, sunny h...

Hydrogen is a clean and environmentally friendly energy vector that can play an important role in meeting the world’s future needs. Therefore, comprehensive study of potential for hydrogen production from solar could greatly facilitate transition to economy. Because by knowing exact amount production, cost-effectiveness its be compared with other methods production. Considering above, it seen s...