X-ray fluorescence (XRF) core scanning is a relatively new arrangement of a classic analytical technique which allows for non-destructive, in situ XRF analysis of sediment cores from submillimetre resolution upwards. In this contribution we explore the use of XRF core scanning for tephrochronology based on the analysis of three gyttja-rich sediment cores from the Faroe Islands. Using a combination of optical and radiographic images, analytical parameters and elemental profiles (Si, K, Ca, Ti, Mn, Fe, Sr and Zr), higher concentration basaltic tephra layers (>1000 shards/cm3) were positively identified. The XRF core scanning did not capture the lower concentration (<850 shards/cm3) rhyolitic layers found in the core. The elemental data generated for the detected tephra layers using XRF core scanning was not comparable to individual shard analysis by electron microprobe. We recommend using XRF core scanning for tephra screening in order to localize depths for high-resolution subsampling and to avoid depths where sediment mixing has caused tailing/mixing of the tephra signal. At the studied site the basaltic Saksunarvatn ash as well as a tephra belonging to the Askja-S/10 ka eruption were identified.
Social entrepreneurship"a new business model that combines a social goal with a business mentality"is in a transitional phase, from a rough cowboy market to a more established market niche. This process results in two interconnected dilemmas for the social entrepreneur. First, how it can capture ...
Successful kidney transplantation corrects many of the metabolic abnormalities associated with chronic kidney disease (CKD); however, skeletal and cardiovascular morbidity remain prevalent in pediatric kidney transplant recipients and current recommendations from the Kidney Disease Improving Glob...
submitted by soteshkappalo 1 year and 8 months ago
Current clinical guidelines recommend the use of a global risk assessment tool, such as those pioneered by the Framingham Heart Study, to determine eligibility for statin therapy in patients with absolute risk levels greater than a certain threshold. In support of this approach, several randomize...
Choline positron emission tomography (PET)/computed tomography (CT) is a currently used diagnostic tool in restaging prostate cancer (PCa) patients with increasing prostate-specific antigen (PSA) after either radical prostatectomy (RP) or external-beam radiation therapy (EBRT). However, no final ...
The purpose of this paper is to present such an analytical framework for analyzing Government Interoperability Frameworks (GIFs) and to do a comparative analysis of a set of GIFs using the analytical framework. Based on the comparative analysis, the paper presents a set of recommendations useful ...
The Netherlands is a low-lying country, in which 9 million people are living below sea level and 70% of the gross domestic product is being earned in areas below sea level. Therefore, protection against flooding is traditionally the primary focus of coastal policy in the Netherlands. Analysis sho...
Quality control processes require accurate knowledge of in situ compressive strength of concrete. The most widely accepted method of determining the compressive strength of concrete in existing structures is to test core specimens drilled from hardened concrete. The strength level is an appropria...
Inpatient geriatric consultation teams are multidisciplinary teams that advice and sensitize health care professionals in the hospital for the care of older patients. Despite the lack of clear evidence that these teams are effective, they were rated highly relevant and introduced in Belgian hospi...
The evaluation and management of cervical spine injuries is a core component of the practice of emergency medicine. This article focuses on evaluation and management of blunt cervical spine trauma by the emergency physician. Pertinent anatomy of the cervical spine and specific cervical spine frac...
submitted by megailprainco 2 years and 4 months ago
The author pioneered in experimentally finding out that an increase in the workpiece peripheral speed proper in a wide range invariantly leads to a definitely better surface roughness, i.e., smaller thickness of cut, suggesting an improvement in the process ergonomics, in cylindrical centered up ...
