Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Filing”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,423 records · Page 79Linked to original sources
PubMed2006

Calculation of dose coefficients for radionuclides produced in a spallation neutron source utilizing NUBASE and the evaluated nuclear structure data file databases.

Based on a mercury spallation neutron source target, the UNLV Transmutation Research Program has identified 72 radionuclides with a half-life greater than or equal to a minute as lacking an appropriate reference for a published dose coefficient according to existing radiation safety dose coefficient databases. A method was developed to compare the nuclear data presented in the ENSDF and NUBASE databases for these 72 radionuclides. Due to conflicting or lacking nuclear data in one or more of the databases, internal and external dose coefficient values have been calculated for only 14 radionuclides, which are not currently presented in Federal Guidance Reports Nos. 11, 12, and 13 or Publications 68 and 72 of the International Commission on Radiological Protection. Internal dose coefficient values are reported for inhalation and ingestion of 1 microm and 5 microm AMAD particulates along with the f1 values and absorption types for the adult worker. Internal dose coefficient values are also reported for inhalation and ingestion of 1 microm AMAD particulates as well as the f1 values and absorption types for members of the public. Additionally, external dose coefficient values for air submersion, exposure to contaminated ground surface, and exposure to soil contaminated to an infinite depth are also presented.

Computer Simulation↗
PubMed2003

Single-file diffusion of atomic and colloidal systems: asymptotic laws.

We present a general derivation of the non-Fickian behavior for the self-diffusion of identically interacting particle systems with excluded mutual passage. We show that the conditional probability distribution of finding a particle at position x(t) after time t, when the particle was located at x(0) at t=0, follows a Gaussian distribution in the long-time limit, with variance 2W(t) approximately t(1/2) for overdamped systems and with variance 2W(t) approximately t for classical systems. The asymptotic behavior of the mean-squared displacement, W(t), is shown to be independent of the nature of interactions for homogeneous systems in the fluid state. Moreover, the long-time behavior of self-diffusion is determined by short-time and large-scale collective density fluctuations.

Journal Article↗
PubMed2002

Use of the metals data file (CRYSTMET) in XAFS analysis.

The X-ray absorption spectrometry (XAS) technique has been widely used to determine the local structure of materials that are poorly suited to study by ordinary diffraction methods, such as fine particles or amorphous matter. XAS is among the major applications at synchrotron radiation facilities and many existing beamlines perform the measurement of XAFS (X-ray absorption fine structure) spectra. XAFS spectra can also be measured with conventional X-ray sources. Measurement of XAFS spectra is relatively straightforward, but real difficulties arise in the analysis and interpretation of the data. Contrary to single-crystal diffraction techniques, the structure is not obtained directly from the measured XAFS data. Model structures must be assumed and the corresponding simulated XAFS spectra must be calculated, with determination of which models best fit the measured data. Model building is a most important part of XAFS analysis, but creation of three-dimensional structures from crystal-chemical considerations can be a very time-consuming task. Utilization of a database of crystal structures and of its built-in structure analysis and display tools can considerably reduce the time and effort required by this task. As XAS is often used to study metals, a database of alloys and intermetallic compounds, such as CRYSTMET, incorporating an array of powerful tools, is then very useful.

Journal Article↗
PubMed1985

Mesoblastic nephromas: a study of 29 tumours from the SIOP nephroblastoma file.

In a series of 889 Wilms' tumours we found 29 pure mesoblastic nephromas. The age of the patients varied from newborn to 22 months, but only five were older than four months. Two histologic types were recognized--leiomyomatous (9) and cellular (20) with a fibrohistiocytic appearance. The leiomyomatous type was almost invariably in stage I, smaller and present in younger infants. At operation half of the cellular type has ruptured or infiltrated the renal pelvis or perirenal tissue. Two patients died of postoperative complications. All others are alive after four years and free from disease.

Female↗
PubMed1987

Sarcomatous Wilms' tumour with clear cells and hyalinization. A study of 38 tumours in children from the SIOP nephroblastoma file.

The International Society of Paediatric Oncology (SIOP) nephroblastoma trial and studies 1, 2 and 5 include 33 sarcomatous Wilms' tumours with a clear cell pattern and five with a hyalinizing pattern among 909 renal tumours. Bone metastases developed in 22 (67%) and one patient (20%) respectively compared with 14 patients (1.6%) in the rest of the series. Both subgroups had clear cells and hyalinization. A constant and characteristic feature of the clear cell tumours was an alveolar vascular pattern which aids in the recognition of this tumour even in fibrous and sclerotic forms. Sarcomatous Wilms' tumour with a hyalinizing pattern had homogeneous areas of sclerosis with clustering of tumour cells but lacked the vascular pattern. Two tumours showed atypia similar to that in malignant rhabdoid tumour of the kidney but had no cytoplasmic inclusions. Five year recurrence-free survival for the entire series was 68%, for sarcomatous clear cell tumours, 42% and for sarcomatous tumours with hyalinizing pattern, 20%.

Adolescent↗