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تعداد نتایج: 14075178 فیلتر نتایج به سال:
a simple and mild procedure for the conversion of anilines into aryl isocyanates is described using the 3-hydroxypropylammonium acetate (hpaa) ionic liquid as a novel and efficient media has been explored in the synthesis of aryl isocyanates from the reaction of substituted urea with sodium nitrite in a water immiscible solvent. this ionic liquid can be easily recovered and reused for many time...
let g=(v,e) be a graph with vertex set v and edge set e.for two vertices u,v of g ,the closed interval i[u,v] ,consists of u,v and all vertices lying in some u-v geodesic in g.if s is a set of vertices of g then i[s]is the union of all sets i[u,v]for u,v ? s. if i[s]=v(g) , then s is a geodetic set for g.the geodetic number g(g) is the minimum cardinality of geodetic set.the maximum cardinalit...
nanoparticles of coordination polymer [co2(pydc)2(h2o)6]n.2n h2o [h2pydc = pyridine-2,5-dicarboxylic acid] have been synthesized by sonochemical method and characterized by elemental analysis, infrared spectroscopy, powder x-ray diffraction, scanning electron microscopy, dls particle size analysis and tga/dta. the structure of single crystalline coordination polymer developed from nanosized coo...
فرض کنید rیک حلقه ی جابجایی و یکدار باشد. تعمیم های متعددی از ایده آل های اول مورد بررسی قرار گرفته است. برای مثال یک ایده آل محض i از r به طور ضعیف اول است (به همین ترتیب، به طور تقریبی اول) اگر برای a,b متعلق به r که ab متعلق به i و مخالف صفراست، آنگاه a متعلق به i یا b متعلق به i. (به همین ترتیب اگر برای a,b متعلق به r که ab متعلق به i ولی متعلق به i بتوان دو نباشد، آنگاه a متعلق به i یا b م...
با توجه به اهمیت حذف یون استرانسیم موجود در پساب‌های هستهای، کار حاضر ضمن سنتز لیگاندهای هیدروکسی بنزآلدهید پروپیل تری اتوکسی سیلان (Si-HL3(EtO)) و پیریدیل متیلیدین (Si-L3(EtO)) بررسی خصوصیات نانو ذرات سیلیکای اصلاح شده این لیگاندها عنوان جاذب جامد از محلول آبی پرداخته شد پارامترهایی مانند pH، زمان، جرم جاذب، دما یون‌های مزاحم مورد آزمایش قرار گرفت. رفتار جذبی جاذب‌ها نشان داد سطح توانای...
the dual diene/1,3-dipolar character of 1-h-imidazole 3-oxide, hio 1, allows this compound toparticipate in a competitive diels-alder (da)/1,3-dipolar cycloaddition (13dc) reaction toward c=sdouble bond of the electro-deficient sulfonyl methane sfm 2. the b3lyp/6-311++g(d,p) calculatedrelative gibbs free energies indicate that among the studied 13dc and da reactions, former iscompletely preferr...
epilepsy is one of the common neurologic disorders in children. drug side-effects are one of the important problems in treating patients with epilepsy. using the antiepileptic medication may cause different side effects such as disorder in bone and vitamin d metabolism. sodium valproate is one of the antiepileptic medications used widely. some of its side effects include digestive disorder, inc...
remote sensing is a key technology for assessing expansion and rate of land cover changes that awareness of these changes as the basic information has a special importance for various programs. in this study, land use changes were examined over the past 24 years, and the feasibility of predicting it in the future was evaluated by using the markov chain model of the abbas plain. landsat tm, etm+...
objective: parkinson's disease (pd) is one of the most common neurodegenerative disorders which is characterized by tremor, rigidity, bradykinesia and postural disturbances. studies indicate that grape juice and exercise may have beneficial effects on neurodegenerative disorders. therefore, in the present study, we evaluated the effects of red grape juice (gj) together with treadmill runni...
in a faunistic survey conducted on auchenorrhyncha in sugar beet fields of mashhad and chenaran regions during 2008-2010, a total of 2741specimens belonging to 5 families were collected. as a result, 10 species were added to the fauna of the study area including: family cicadellidae: rhytidodus decimusquartus (schrank 1776), viridicerus malicola (dubovxdy 1966); handianus procerus (herrich-scha...
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