نتایج جستجو برای: fission track
تعداد نتایج: 78046 فیلتر نتایج به سال:
Abstract. A new method for automatic counting of etched fission tracks in minerals is described and presented this article. Artificial intelligence techniques such as deep neural networks computer vision were trained to detect surface semi-tracks on images. The can be used an open-source program semi-automated track dating called “AI-Track-tive”. Our custom-trained use the YOLOv3 object detecti...
همتافت میشو در شمال باختر ایران برجستگی توپوگرافی شاخصی است که توسط گسل‌های شناخته شده‌ای همچون گسل شمال میشو و گسل جنوب میشو دربر گرفته شده و پی سنگ پرکامبرین دارای رخنمون وسیعی در این منطقه است. داده‌های ساختاری نشانگر این است که برافرازش کوه‌های میشو در ارتباط باگسل‌های پیرامون این گوه ساختاری است و گسل شمال میشو (NMF) و گسل جنوب میشو (SMF) به همراه گسل تسوج (TF) نقش چشمگیری در شکل‌گیری سیم...
The effect of pre-gamma irradiation on track density, bulk etch rate and light absorbance in CR-39 was investigated. CR-39 detectors were irradiated with gamma doses over a range of 0 to 280 kGy (0 to 28 Mrad). The detectors were overlaid with 0.77 mm of polyethylene and exposed to a known fluence of 252Cf spontaneous fission neutrons. All detectors were then etched in 6.25N sodium hydroxide so...
Groups of animals (Wistar rats) were fed with rations doped with uranyl nitrate at concentrations ranging from 0.5 to 100 ppm. The uranium content in the ashes of the organs was measured by the neutron-fission track counting technique. The most striking result is that the transfer coefficients, as a function of the uranium concentration, exhibit a concave shape with a minimum around 20 ppm-U fo...
current practices in railway track analysis and design are reviewed and discussed in this paper. the mechanical behavior of railway track structure comprising of various components has not been fully understood due to the railway track structural complexity. although there have been some improvements in the accuracy of current track design methods in recent decades, there are still considerable...
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