methanesulfonic acid (msa) was found to be an efficient catalyst for the synthesis of 1-substituted-1h-1,2,3,4-tetrazoles. a series of 1-substituted tetrazole compounds were synthesized from the reaction of various primary amines, sodium azide and triethyl orthoformate in the presence of catalytic amounts of msa at room temperature. in this protocol, some of the tetrazole derivatives were synth...

sense of place is the most important features of space for designers in relation between human and environment, although key theories of the mid-twentieth century have shown that some social and psychological factors are more effective than physical characteristics but in this research, the focus is on the physical features of space. many researchers have been analyzed physical features and its...

introduction: global patient safety is the concern of all areas of the health care. in addition to the human suffering in those inflicted unsafe care and services, it has a heavy economic cost. due to the sensitive patient safety in the operation rooms, the present study aimed to assess patient safety in the operating rooms. methods: this was a descriptive cross-sectional study that was conduct...

This research had two aims. Firstly, to examine availability of emotional support in chat rooms, and secondly, to investigate openness and dishonesty in chat rooms. Three hundred and twenty respondents (160 women and 160 men) filled out the ‘Chat Room Survey’. It was found that people who spend more time in chat rooms were more likely to be open about themselves, receive emotional support, and ...

background: radiation therapy  uses high-energy radiation to kill cancer cells. photoneutron contamination and induced radioactivity of high energy therapeutic photon beams are considered as the main source of occupational exposure to radiation therapists who works with linear accelerators operating above 10 mv. materials and methods: the gamma dose rates were measured after termination of diff...

in this research, we have developed cheap recyclable and task-specific acidic ionic liquids (ails) 1-hydrogen-3-methylimidazolium hydrogen sulfate [hmim]hso4, 1-hydrogen-3-methylimidazolium chloride [hmim]cl, 2-pyrrolidonium hydrogensulfate [hnhp]hso4 and applied them in acid catalyzed synthesis of quinoxaline derivatives from 1,2-phenylendiamines and 1,2-dicarbonyl compounds. the products coul...

introduction and aims: occupational burnout is a syndrome including emotional exhaustion, depersonalization, self-efficacy and involvement. medical staff are susceptible to occupational burnout due to physical, mental and emotional stress. the present research aims to investigate the operation room staff’s burnout in shahid mohammadi hospital of bandar abbas. methods: in this descriptive/analyt...

the knoevenagel condensation of aromatic aldehydes with barbituric acid, dimedone and malononitrile occurred in the presence of bf3/nano-γ-al2o3 at room temperature in ethanol. this catalyst is characterized by powder x-ray diffraction (xrd), fourier transform infrared spectroscopy (ft-ir), thermal gravimetric analysis (tga), field emission scanning electron microscopy (fesem) and energy-disper...

OBJECTIVES To investigate the effectiveness of snoezelen, integrated in 24-hour daily care, on the behavior and mood of demented nursing home residents. DESIGN Quasiexperimental pre- and posttest design. SETTING Twelve psychogeriatric wards of six nursing homes, spread over different parts of the Netherlands. PARTICIPANTS One hundred twenty-five patients with moderate to severe dementia a...

objectives : optimum viewing conditions facilitate identification of radiographic details and decrease the need for retakes, patients’ costs and radiation dose. this study sought to evaluate the effects of different viewing conditions on radiographic interpretation. materials and methods: this diagnostic study was performed by evaluating radiograph of a 7mm-thick aluminum block, in which 10 hol...