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| 1 | Geochemistry of the Rare Earth Elements in Natural Terrestrial Waters:A Review of What Is Currently Known显示文摘The range of observed Chemical compositions of natural terrestrial waters varies greatly especially when compared to the essentially constant global composition of the oceans.The concentrations of the REEs in natural terrestrial waters also exhibit more variation than what Was reported in seawater. In terrestrial waters, pH values span the range from acid up to alkaline. In addition, terrestrial waters can range from very dilute waters through to highly concentrated brines. The REE concentrations and their behavior. in natural terrestrial waters reflect these compositional ranges. Chemical weathering of rocks represents the source of the REEs to natural terrestrial waters and, consequently, the REE signature of rocks can impart their REE signature to associated waters. In addition, because of the typical low solubilities of the REEs, both surface and solution complexation can be important in fractionating REEs in aqueous solution. Both of these processes are important in all natural terrestrial waters, howev-er, their for relative importance varies as a function of the overall solution composition. In alkaline waters, for example, solution complexation of the REEs with carbonate ions appears to control their aqueous distributions whereas in acid waters, the REE signature of the labile fraction of the REEs is readily leached from the rocks. In circumneutral pH waters, both processes appear to be important and their relative significance has not yet been determined. | KEVIN, H. JOHANNESSON ZHOU XIAOPING(Groundwater Chemistry Group,Harry Reid Center for Environmental Studies,University of Nevada,Las Vegas,Nevada,89154-4009,U.S.A.) | 1997 | Chinese Journal Of Geochemistry1997，16，1： | 6 |
| 2 | Magnetic resonance imaging:Is there a role in clinical management for acute ischemic colitis?显示文摘AIM:To validate the utility of magnetic resonance imaging(MRI) for the clinical management of acute ischemic colitis(IC).METHODS:This is a magnetic resonance(MR) prospective evaluation of 7 patients who were proved to have acute IC on the basis of clinical,endoscopic and computed tomography(CT) findings and who were imaged in our institution between February 2011 and July 2012.The mean age of the patients was 72.28 years.Abdominal CTs were obtained using a 64-detector row configuration for all patients with un-enhanced and contrast-enhanced scans,in the late arterial phase(start delay 45-50 s) and in the portal venous phase(start delay 70-80 s).The MR examinations were performed using a 1.5T superconducting magnet,using Fast Imaging Employing Steady State Acquisition and T2-weighted fast-recovery fast-spin echo sequences in axial and coronal plane.CT and MRI examinations were analysed for the presence of colonic abnormalities and associated findings.RESULTS:Segmental involvement was seen in 6 patients(85.71%),with a mean length of involvement of 412 mm(range 145.5-1000 mm).Wall thickness varied between 6 mm and 17.5 mm(mean 10.52 mm) upon CT examinations and from 5 to 15 mm(mean 8.8 mm) upon MR examinations.The MRI appearance of the colonic wall varied over the time:TypeⅠappearance with a 3 layer sandwich sign was seen in 5 out of 12 examinations(41.66%),patients underwent MR within a mean of 36 h(ranging from 1 to 54 h) after the CT examination.Type Ⅱ and Ⅲ appearance with a 2 layer sign,was seen in 4 examinations(33.33%),patients underwent MR within a mean of 420.5 h(ranging from 121 to 720 h) after the CT examination.In the remaining three MRI examinations,performed within a mean of 410 h(ranging from 99.5 to 720 h) the colonic wall appeared normal.CONCLUSION:MRI,only using precontrast images,may be used as a substitute for invasive procedures in diagnosis and follow-up of acute IC. | Maria Antonietta Mazzei Susanna Guerrini Nevada Cioffi Squitieri Giusi Imbriaco Raffaele Chieca Serenella Civitelli Vinno Savelli Francesco Giuseppe Mazzei Luca Volterrani | 2013 | World Journal of Gastroenterology2013，19，8： | 5 |
| 3 | Accuracy of MDCT in the preoperative definition of Peritoneal Cancer Index (PCI) in patients with advanced ovarian cancer who underwent peritonectomy and hyperthermic intraperitoneal chemotherapy (HIPEC)显示文摘 | Maria Antonietta Mazzei Leila Khader Alfredo Cirigliano Nevada Cioffi Squitieri Susanna Guerrini Beatrice Forzoni Daniele Marrelli Franco Roviello Francesco Giuseppe Mazzei Luca Volterrani | 2013 | Abdominal Imaging2013，，： | 1 |
| 4 | Have scientists discovered how to create downpours in the desert显示文摘 | Darby Reno Nevada | 2011 | Dailymail2011，1，3： | 1 |
| 5 | Follow-up of endovascular aortic aneurysm repair:Preliminary validation of digital tomosynthesis and contrast enhanced ultrasound in detection of medium- to long-term complications显示文摘AIM: To validate the feasibility of digital tomosynthesis of the abdomen(DTA) combined with contrast enhanced ultrasound(CEUS) in assessing complications after endovascular aortic aneurysm repair(EVAR) by using computed tomography angiography(CTA) as the gold standard.METHODS: For this prospective study we enrolled 163 patients(123 men; mean age, 65.7 years) referred for CTA for EVAR follow-up. CTA, DTA and CEUS were performed at 1 and 12 mo in all patients, with a maximum time interval of 2 d.RESULTS: Among 163 patients 33 presented complications at CTA. DTA and CTA correlated for the presence of complications in 32/33(96.96%) patients and for the absence of complications in 127/130(97.69%) patients; the sensitivity, specificity, positive predictive value(PPV), negative predictive value(NPV) and accuracy of DTA were 97%, 98%, 91%, 99%, and 98%, respectively. CEUS and CTA correlated for the presence of complications in 19/33(57.57%) patients and for the absence of complications in 129/130(99.23%) patients; the sensitivity, specificity, PPV, NPV and accuracy of CEUS were 58%, 99%, 95%, 90%, and 91%, respectively. Sensitivity, specificity and accuracy of combining DTA and CEUS together in detecting EVAR complications were 77%, 98% and 95%, respectively.CONCLUSION: Combining DTA and CEUS in EVAR follow-up has the potential to limit the use of CTA only in doubtful cases. | Maria Antonietta Mazzei Susanna Guerrini Francesco Giuseppe Mazzei Nevada Cioffi Squitieri Dario Notaro Gianmarco de Donato Giuseppe Galzerano Palmino Sacco Francesco Setacci Luca Volterrani Carlo Setacci | 2016 | World Journal of Radiology2016，8，5： | 1 |
| 6 | Romero-Isart显示文摘 | NEVADA M | 2002 | J lnorg Biochem2002，88，34： | 1 |
| 7 | Material and interaction properties of selected grains and oil seeds for modeling discrete particles显示文摘 | Resort G S Nevada C R | 2009 | ASABE Annual International Meeting2009，16，： | 1 |
| 8 | Video-Based Event Recogni-tion:Activity Representation and Probabilistic Recognition Meth-ods显示文摘 | Hongeng S Nevada R Bremond F | | 0，，02： | 1 |
| 9 | Sigmoid diverticulitis: US findings显示文摘 | Maria Antonietta Mazzei Nevada Cioffi Squitieri Susanna Guerrini Amato Antonio Stabile Ianora Lucio Cagini Luca Macarini Melchiore Giganti Luca Volterrani | 2013 | Critical Ultrasound Journal2013，，： | 1 |
| 10 | The role of US examination in the management of acute abdomen显示文摘 | Maria Antonietta Mazzei Susanna Guerrini Nevada Cioffi Squitieri Lucio Cagini Luca Macarini Francesco Coppolino Melchiore Giganti Luca Volterrani | 2013 | Critical Ultrasound Journal2013，，： | 1 |
| 11 | On the Generalized Theory of Atmospheric Particle Systems显示文摘OntheGeneralizedTheoryofAtmosphericParticleSystems￥LiuYangang(DesertResearchInstitute,AtmosphericSciencesCenter,Reno,Nevada89... | Liu Yangang (Desert Research Institute, Atmospheric Sciences Center, Reno, Nevada 89506-0220,USA) | 1995 | Advances in Atmospheric Sciences1995，12，4： | 1 |
| 12 | Material and interaction properties of selected grains and oil seeds for modeling discrete particles 显示文摘 | Resort G S Nevada C R | 2009 | ASABE Annual International Meeting2009，，7： | 1 |
| 13 | Material and interaction properties of selected grains and oil seeds for modelingdiscrete particles显示文摘 | Resort G S Nevada C R | 2009 | ASABE Annual International Meeting2009，，7： | 1 |
| 14 | Rites of passage: A comparison of US, Malaysian and Brazilian adolescents显示文摘 | Sherri Nevada McCarth Luciana Karine de Souza Jas Jafaar | 2010 | 美中教育评论2010，7，11： | 0 |
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