mbt chaussure Orchard soil nutrients in Yangcheng

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Orchard soil nutrients in Yangcheng County Analysis and Improvement

Into the imaging agent (such as FDG) imaging after injection of the human body. Because the body's metabolic state of different organizations with different, so these are marked nuclides of various substances in the body tissue distribution is also different. If the metabolism of malignant tumors in the high distribution of more images of these features reflect the elk through, so sweet and good cream into the lemon break,[link widoczny dla zalogowanych], and analysis of Mu Ding a dagger through your mind right foot radiation power means the thistle official dinner to shoot eight objects one piece, it is widely clothing space-time: three 【j's positive right foot movements in human tissue after a very short distance (generally lnm1) and power of the encounter and annihilation, produce two energy of 511keV photons emitted in the opposite direction. According to different parts of the body ability to absorb the different labeled compounds, isotope in the body parts of the uptake of the different levels of intensity of the photon annihilation reaction is different, measuring two photons can be sure of the submerged electronics Received Date :2007-03- 13,[link widoczny dla zalogowanych], no location, time and energy information. Because malignant tissue metabolism, absorption of radioactive substances more than the average organization, PET radioactive drugs by measuring the density distribution can determine the distribution of malignant tissue. PET molecular imaging expression of cellular and molecular level biological processes in vivo in the display and measurement of biological systems can and do not disrupt the biological system, but also on the molecular changes associated with disease after the imaging to quantify. PET detection of nuclear annihilation radiation spectroscopy methods photons can be related to material microstructure information, it provides a non-destructive detection means. 2PET 2.1 key performance indicators show that the spatial resolution of PET spatial resolution in space of the two An ideal point source of radioactivity on the FOV in PET, PEt radioactivity distribution of the resulting image is not a point, but will be extended, the get is a capacity. Resolution is defined as the point spread function of the source of half-width and height. PET for the three-dimensional imaging, the resolution of the three mutually perpendicular directions with the half width to indicate that the axial resolution (along the axis of the detector center of the ring), the radial resolution (along the central axis of the radius of any direction) and tangential resolution (and in the central axis perpendicular to the plane in the direction of any radius). Spatial resolution depends on the location of the ring detector resolution. Because the detector is detector, scintillation detector unit representative of the geometry of position sensitivity, therefore, flash products from this about the geometry of the body cells as small as possible. In addition, the point source placed in different locations in the field of view FOV, the resolution is slightly different,[link widoczny dla zalogowanych], the farther away from the FOV center, the worse the resolution, which is by the detector parallax error, which is a different location in the FOV of the probe point source position-sensitive devices due to different perspectives unit. 2_2 sensitivity of detection sensitivity of commonly used PET units per unit volume of detector under radiation dose to the case to represent. The higher sensitivity of the request to some statistical error, the radiation to specific organs, the lower the better strength requirements; IT plaque of Health decided to foot the sensitivity of test species dose Knight Ⅱ scattered thousands of {I; mining flowers on a short vertical bars become official calculated based on a. The main factors that affect the sensitivity: the first ~, the measured object detector solid angle of the sheets. The net of the small solid angle of non-sensitive area detector qj interval between the crystals caused by dead Lang points. Second, the detection efficiency of the detector itself, the detector response and the number of cases the ratio of the number of incident cases. Third, the system time window, the window size to seedlings. Fourth, the system died when asked. TheDiagnosisoftheSoilNutrientoftheOrchardsinYangchengCountyandSomeImprovingMeasuresSONGBin,[link widoczny dla zalogowanych], WANGQiang, CAIHong-bingABSTRACT: ThispaperintroducesthegeneralsituationofthefruitproductioninYangchengCounty,[link widoczny dla zalogowanych], analyzesonthesoilnutrientoftheorchardsinYangchengCounty, andinthelightoftheexistingproblems, advancessomecorrespondingme, aSures. KEYWORDS: orchard; soilnutrient; scientificfertilization162
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