نتایج جستجو برای: optical density
تعداد نتایج: 658578 فیلتر نتایج به سال:
We demonstrate significantly improved magneto-optical trapping of molecules using a very slow cryogenic beam source and either rf modulated or dc magnetic fields. The rf magneto-optical trap (MOT) confines 1.0(3)×10^{5} CaF molecules at a density of 7(3)×10^{6} cm^{-3}, which is an order of magnitude greater than previous molecular MOTs. Near Doppler-limited temperatures of 340(20) μK are att...
in this paper, the nucleation and growth of diamond/diamond-like coatings on austenitic (aisi 316) and ferritic (aisi 430) stainless steel substrates have been investigated using torch technique. the effects of substrate surface preparation has also been studied. the quality of coatings produced has been examined using optical and scanning electron microscopy, x-ray diffraction, raman spectrosc...
introduction: an ideal intracanal medicament should be able to eliminate any remaining intracanal microorganism. the aim of this study was to compare the antimicrobial effects of bioglass 45s5 with calcium hydroxide on enterococcus ( e ) faecalis in-vitro . materials & methods: direct exposure test (det) was used to evaluate the antimicrobial effect of bioglass 45s5, calcium hydroxide and norma...
PURPOSE The primary purpose of this study was to examine the changes in myocardial oxidative stress during the support of a left ventricular assist device (LVAD). METHODS Myocardial tissue was collected from the lower left ventricle of 15 adult subjects with class IV heart failure (HF) during LVAD placement (n=9) or LVAD removal (Post-LVAD; n=6). Each tissue sample was separated into cytosoli...
in this investigation the effect of external field on the electron density of nanostructures of cds, cdse, cdte, gaas and polymeric structure of three, four, five and six units of cds as a kind of nanosolar cells has been studied theoretically. as modeling this system in nanodimension, molecular structures has used. specific properties of molecular structures permit us to consider different sym...
Individual differences in abnormal color vision are well known. A fundamental unresolved problem is the great variation in color vision even among those classified as having the same color-vision defect. Several physiological hypotheses have been proposed to account for this variation but little consideration has been given to how (and how much) color matching and discrimination are affected by...
BACKGROUND & AIMS Lutein and zeaxanthin accumulate in retina (macular pigment). Their nutritional status can be assessed using dietary or biochemical markers and both have been associated with macular pigment optical density. We proposed to assess dietary and status markers of lutein and zeaxanthin in a group of healthy Spanish volunteers, considering the potential influence of age, gender and ...
obejective(s): in this research, magnetite nanoparticles with an average size of 23-36 nm were successfully synthesized via surfactant-free electrochemical method using iron as the anode and water as the electrolyte in a closed aqueous system in the presence of naoh at room temperature. methods: the effect of the current density on product formation and particle size was investigated. particle ...
تب برفکی بیماری ویروسی است که در بیشتر کشورها وجود دارد. عامل بیماری تب برفکی یک rna ویروس از جنس آفتوویروس (aphthovirus) و خانواده پیکورناویریده (picornaviridae) می باشد. هدف از مطالعه پیش رو ارزیابی اثر ضد ویروسی ترکیب گیاهی آریا اورال® بر ویروس تب برفکی سویه ی opanasia در شرایط برون تنی به روش neutral red uptake (nru assay) می باشد. در این تحقیق از سه ماده تشکیل دهنده این ترکیب که شامل اوژین...
Lead free, eco-friendly bismuth borate glasses doped with alkali oxides of composition xLi2O+(30-x)Na2O+55B2O3+15Bi2O3 (x = 5,10,15,20,25) were prepared by melt quenching technique. Amorphous nature of glasses was confirmed by X-ray diffraction. Density measurements were carried out at room temperature by standard principle of Archimedes with Xylene as an immersion liquid. The non-linear ...
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