Introduction: Previous studies have shown that 54 Cr is heterogeneously distributed in Solar System materials, including chondrites, differentiated stony and iron meteorites [1]. Each meteorite group has its characteristic 54 Cr signature. Even though the 54 Cr anomalies are widely thought to be nucleosynthetic in origin, the nucleosynthetic process responsible for its production and the cause ...

روش الکتریکی به عنوان یک بررسی ژئوفیزیکی می‌تواند پارامترهای زمین‌شناسی شامل خردشدگی، شاخص دگرسانی توده سنگ، درصد اشباع، کیفیت آب زیرزمینی و . را خوبی نمایش دهد. این پارامترها نقش مهمی در طبقه‌بندی مهندسی سنگ از طریق تأثیر بر دو (RQD) مقاومت (GSI)، کانه‌زایی عناصر نیز نحوه حفاری دارند. مقاله با استفاده سونداژ قائم لایه‌های زیرسطحی تعیین متعاقباً مذکور توده‌سنگ‌های آذرآواری آنومالی III کانسار نار...

Scientific interest on chromium removal from water and wastewater has escalated recently. Chromium compounds exist in the environment naturally but are mostly found due to anthropogenic activities (tanning, paint, cement industries, etc.). Hexavalent chromium [Cr(VI)] is of major environmental importance because it is one of the most stable chromium forms found in the environment. It is soluble...

Herpes Zoster (HZ) is a segmental erup on of grouped vesicles that are confined to a dermatome. There is dermatomal distribu on of skin rash, which is unilateral. When two non contagious dermatomes are involved, if affected bilaterally, it is called HZ duplex bilateralis; if unilaterally, unilateralis. HZ duplex bilateralis is extremely rare in immunocompetent children. This report describes a ...

In section many low-FeO CR chondrules are surrounded by rings of metal; this metal-cladding seems to have formed during chondrule melting events as films of metal that wetted the surface. Electron microprobe studies show that in each ring the metal is very uniform in composition, consistent with efficient mixing during formation of the metal film. In contrast the mean Ni contents of 13 differen...

In this paper, we introduce the notion of weakly e-continuous functions in topological spaces. Weak s-contlnulty and subweak continuity due to Rose [i] are independent of each other and are implied by weak continuity due to Levlne [2]. It is shown that weakly e-continuous surjections preserve connected spaces and that weakly e-contlnuous functions into regular spaces are continuous. Corollary i...

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Using first-principles theory, we predict ferromagnetism in Cr-doped GaN nanowires irrespective of the sites that the Cr atoms occupy. This is in contrast to Mn-doped GaN nanowires in which the magnetic coupling between the Mn atoms is sensitive to the Mn--Mn and Mn--N distances, although the ground state of Mn-doped GaN nanowires is ferromagnetic. Each Cr atom carries a magnetic moment of abou...