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| 1 | PREDICTION OF THE GRAIN SIZE OF SUSPENDED SEDIMENT:IMPLICATIONS FOR CALCULATING SUSPENDED SEDIMENT CONCENTRATIONS USING SINGLE FREQUENCY ACOUSTIC BACKSCATTER显示文摘Collection of samples of suspended sediment transported by streams and rivers is difficult and expensive. Emerging technologies, such as acoustic backscatter, have promise to decrease costs and allow more thorough sampling of transported sediment in streams and rivers. Acoustic backscatter information may be used to calculate the concentration of suspended sand-sized sediment given the vertical distribution of sediment size. Therefore, procedures to accurately compute suspended sediment size distributions from easily obtained river data are badly needed. In this study, techniques to predict the size of suspended sand are examined and their application to measuring concentrations using acoustic backscatter data are explored. Three methods to predict the size of sediment in suspension using bed sediment, flow criteria, and a modified form of the Rouse equation yielded mean suspended sediment sizes that differed from means of measured data by 7 to 50 percent. When one sample near the bed was used as a reference, mean error was reduced to about 5 percent. These errors in size determination translate into errors of 7 to 156 percent in the prediction of sediment concentration using backscatter data from 1 MHz single frequency acoustics. | R. A. KUHNLE D. G. WREN J. P. CHAMBERS | 2007 | International Journal of Sediment Research2007，22，1： | 4 |
| 2 | Sperm retrieval success and testicular histopathology in idiopathic nonobstructive azoospermia显示文摘Prior studies have investigated sperm retrieval rates in men with non obstructive azoospermia(NOA)secondary to specific etiologies,yet most cases of NOA are idiopathic.We compared sperm retrieval rates and testicular histopathology in idiopathic NOA(iNOA)and nonidiopathic NOA(niNOA).We performed a retrospective review of men with NOA who underwent microdissection testicular sperm extraction(microTESE)between 2000 and 2016.Men with no history of malignancy or cryptorchidism and negative genetic evaluation were considered idiopathic.Multivariable regression determined the association between idiopathic etiology and primary outcomes of sperm retrieval and active spermatogenesis on histopathology.Among 224 men,86(38.4%)were idiopathic,75(33.5%)were nonidiopathic,and 63(28.1%)did not undergo genetic testing.Median age and serum testosterone were higher among iNOA or no testing versus niNOA.Median follicle-stimulating hormone(FSH)was lower among iNOA or no testing versus niNOA.A higher proportion of iNOA or no testing versus niNOA had a clinical varicocele.Sperm retrieval rates were similar between iNOA,niNOA,and no testing(41.8%vs 48.0%vs 55.6%,respectively;P=0.255).Active spermatogenesis was seen in a higher proportion of iNOA or no testing versus niNOA(31.4%and 27.0%vs 16.0%,P=0.073).On multivariable analysis,iNOA was not associated with sperm retrieval or spermatogenesis(P=0.430 and P=0.078,respectively).Rates of sperm retrieval and spermatogenesis on testis pathology were similar in men with iNOA and niNOA.These data will be useful to clinicians in preoperative counseling for men with NOA and negative genetic evaluation. | Arighno Das Joshua A Halpern Annie L Darves-Bornoz Mehul Patel James Wren Mary Kate Keeter Robert E Brannigan | 2020 | Asian Journal of Andrology2020，22，6： | 3 |
| 3 | Real-time tracking of the human body显示文摘 | Wren C Azarbayejani A Darrell T | 1997 | IEEE Trans on Pattern Anal Machine Inteil1997，19，： | 1 |
| 4 | Sudden death in children and adolescents显示文摘 | Wren C | 2002 | Heart2002，88，4： | 1 |
| 5 | Pfinder: Real-time Tracking of the Human Body 显示文摘 | Wren C R Azarbayejani A Darrell T | 1997 | I EEE Tralasactions on Pattern Analysis and Machine Intelligence (S0162-8828)1997，19，7： | 1 |
| 6 | Real-time tracking of the human body显示文摘 | Wren C R Azarbayejani A P | 1997 | IEEE Transactions on Pattern Analysis and Machine Intelligence1997，19，7： | 1 |
| 7 | Survival with congenital heart disease and need for follow up in adult life显示文摘 | Wren C O'Sullivan JJ | 2001 | Heart2001，85，4： | 1 |
| 8 | Ghrelin enhances appetite and increases food intake in humans显示文摘 | WREN A M SEAL L J COHEN M A | 2001 | J Clin Endocrinol Metab2001，86，12： | 1 |
| 9 | Pfinder: Real-time Tracking of the Human Body显示文摘 | Wren C R Azarbayejani A Darrell T | 1977 | IEEE Transactions on Pattern Analysis and Machine Intelligence1977，7，7： | 1 |
| 10 | Genome sequence of Yersinia pestis, the causative agent of plague 显示文摘 | Parkhill J Wren BW Thomson NR | 2001 | Nature2001，413，： | 1 |
| 11 | Pfinder:Real-time Tracking of the Human Body显示文摘 | WREN C AZARBAYEJANI A DARRELL T | 1997 | IEEE Transactions on Pattern Analysis and Machine Intelligence1997，19，7： | 1 |
| 12 | The genome sequence of the food-borne pathogen Campylobacter jejuni reveals hypervariable sequences显示文摘 | Parkhill J Wren BW Mungall K | 2000 | Nature2000，403，6770： | 1 |
| 13 | Timing of peak bonemass:discrepancies between CT and DXA显示文摘 | Wren T A Kim P S Janicka A | 2007 | J Clin EndocrinolMetab2007，92，3： | 1 |
| 14 | Information consensus in mul- tivehicle cooperative control: Collective group behavior through lo- cal interaction 显示文摘 | WRen R W Beard E M Atkins | 2007 | IEEE Control Systems Magazine2007，27，2： | 1 |
| 15 | Pfinder: Real-time tracking of the human body显示文摘 | Azarbayejani A Darrell T | 1997 | IEEE Trans on Pattern Analysis and Machine Intelligence1997，19，7： | 1 |
| 16 | Pfinder:real-timetracking of the human body显示文摘 | Wren C Azarbayejani A Darrell T et a1 | 1997 | IEEE Transactions on PatternAnalysis and Machine Intelligence1997，19，7： | 1 |
| 17 | Pressure oscillations in regenerative liquid propellant guns显示文摘 | Wren G Klingenberg G | 1995 | Journal of Propellants Explosives and Pyrotechnics1995，20，1： | 1 |
| 18 | Social and emotional impant of strabismus surgery on quality of life in children显示文摘 | Archer SM Musch DC Wren PA | 2005 | J AAPOS2005，9，2： | 1 |
| 19 | Computer scheduling of vehicles from one or more depots to a number of delivery points 显示文摘 | Wren A H A | 1972 | Operational Research Quarterly1972，23，3： | 1 |
| 20 | Sediment transport on the mid-continental shelf in Onslow Bay North Carolina during Hurricane Isabel显示文摘 | WREN P A LEONARD L A | 2005 | Estuarine Coastal and Shelf Science2005，63，： | 1 |
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