Hydrometeorological investigations on a small valley glacier in the Sawtooth Range, Ellesmere Island, Northwest Territories

Hydrometeorological techniques were employed during the summer of 1993 to study a small (4.7km2) valley glacier in the Sawtooth Range, Fosheim Peninsula, Ellesmere Island, Northwest Territories. The annual 1992-93 mass balance for Quviagivaa Glacier (unofficial name), and for the adjacent Nirukittuq Glacier (unofficial name) was -532mm and -530mm water equivalent respectively. The equilibrium line altitude was above the upper limit of the glaciers due to the exceptional warmth of the summer. Slight marginal shrinking in the areal extent of Quviagivaa Glacier since 1959 suggests that strongly negative mass balances such as those recorded in 1993 are not indicative of the last 46 years. In order to determine the main factors influencing ablation and runoff on the glacier, statistical analyses were performed using daily runoff values, ablation data, and several hydrometeorological elements. Accumulated hourly temperature (melting degree hours) had the highest correlated with ablation. The best prediction of average daily discharge was achieved using a multiple regression of discharge with air temperature, wind speed, shortwave incoming radiation, and net radiation hours. Superimposed ice formed on 95% of the surface of Quviagivaa Glacier during the melt season, and reached thicknesses of 30cm at the glacier terminus. A strong correlation was found between snow depth and superimposed ice formation. On average, 67% of the snowpack water equivalent formed superimposed ice. The net accumulation of superimposed ice occurred on \u3c10% of the area of Quviagivaa Glacier, but evidence suggests that in 1992 this percentage was closer to 65%. It is likely that the primary form of net accumulation for the glaciers of the Sawtooth Range is superimposed ice

Spectroscopic Sensitivity

We describe the overall performance of the STIS CCD after HST Servicing Mission #4 and the associated updates to calibration reference files. Most aspects of CCD performance are found to be fairly consistent with extrapolations of the trends seen prior to the failure of STIS in August 2004. The CCD gain value for the CCDGAIN = 4 setting has been redetermined using net count ratios of standard star spectra taken in the CCDGAIN = 1 and CCDGAIN = 4 settings, resulting in a gain value of 4.016 ± 0.003 e − /DN, which is 0.5% lower than the value used for the calibration of archival STIS CCD data taken before August 2004. Finally, we identify two independent indications of a temperature dependence of the Charge Transfer Efficiency (CTE). However, more calibration data are needed to verify the significance of this effect and, if verified, to calibrate it as a function of CCD housing temperature (as a proxy for CCD chip temperature). This option will be reassessed later during the Cycle 17 calibration program.

Report from the Participation in the Current System Workgroup

OSI2016 Workgroup Question: Do researchers and scientists participate in the current system of scholarly publishing because they like it, they need it, they don’t have a choice in the matter, or they don’t really care one way or another? What perceptions, considerations and incentives do academicians have for staying the course (like impact factors and tenure points), and what are their pressures and incentives for changing direction (like lowering publishing charges)? The authors of scholarly works play a critical role in the scholarly communications system: authors are the original content creators, and in many or most cases are the original rightsholders and the ultimate decisionmakers when it comes to how, when, and where to publish their work. Although there are other significant participants in the current system (including publishers, librarians, information consumers, etc.), understanding and respecting the range of influences that shape author publication decisions are crucial to effecting change in the system. While recognizing the highly individual and diverse nature of author interests, we identified several priorities that stand out as driving decisions in the publication process. Career advancement concerns are primary, and the perceived currency of a publication mode or venue with promotion and tenure committees is a significant factor in decision making. A related, but distinct, factor is a publication venue’s perceived prestige among the authors’ peers. Both of these considerations have significant interplay with, and often serve as proxies for, scholarly authors’ overarching motivation to advance knowledge and make an impact in their fields. External factors may also direct author choice. Funder requirements and, in the case of works made for hire, employer requirements, can narrow the range of options available to authors. Survey evidence suggests that authors increasingly see open publication models as being consistent with, or in furtherance of, their goals as scholars.1 For instance, authors increasingly see open access (OA) publication as leading to wider circulation, greater visibility, and possibly more citations. Our task was to consider how we might accelerate these trends to facilitate openness in scholarship

Report from the Participation in the Current System Workgroup

OSI2016 Workgroup Question: Do researchers and scientists participate in the current system of scholarly publishing because they like it, they need it, they don’t have a choice in the matter, or they don’t really care one way or another? What perceptions, considerations and incentives do academicians have for staying the course (like impact factors and tenure points), and what are their pressures and incentives for changing direction (like lowering publishing charges)? The authors of scholarly works play a critical role in the scholarly communications system: authors are the original content creators, and in many or most cases are the original rightsholders and the ultimate decisionmakers when it comes to how, when, and where to publish their work. Although there are other significant participants in the current system (including publishers, librarians, information consumers, etc.), understanding and respecting the range of influences that shape author publication decisions are crucial to effecting change in the system. While recognizing the highly individual and diverse nature of author interests, we identified several priorities that stand out as driving decisions in the publication process. Career advancement concerns are primary, and the perceived currency of a publication mode or venue with promotion and tenure committees is a significant factor in decision making. A related, but distinct, factor is a publication venue’s perceived prestige among the authors’ peers. Both of these considerations have significant interplay with, and often serve as proxies for, scholarly authors’ overarching motivation to advance knowledge and make an impact in their fields. External factors may also direct author choice. Funder requirements and, in the case of works made for hire, employer requirements, can narrow the range of options available to authors. Survey evidence suggests that authors increasingly see open publication models as being consistent with, or in furtherance of, their goals as scholars.1 For instance, authors increasingly see open access (OA) publication as leading to wider circulation, greater visibility, and possibly more citations. Our task was to consider how we might accelerate these trends to facilitate openness in scholarship

Minimally Invasive Mitral Valve Surgery II: Surgical Technique and Postoperative Management.

Techniques for minimally invasive mitral valve repair and replacement continue to evolve. This expert opinion, the second of a 3-part series, outlines current best practices for nonrobotic, minimally invasive mitral valve procedures, and for postoperative care after minimally invasive mitral valve surgery

The International Scientific Association for Probiotics and Prebiotics (ISAPP) consensus statement on fermented foods

An expert panel was convened in September 2019 by The International Scientific Association for Probiotics and Prebiotics (ISAPP) to develop a definition for fermented foods and to describe their role in the human diet. Although these foods have been consumed for thousands of years, they are receiving increased attention among biologists, nutritionists, technologists, clinicians and consumers. Despite this interest, inconsistencies related to the use of the term ‘fermented’ led the panel to define fermented foods and beverages as “foods made through desired microbial growth and enzymatic conversions of food components”. This definition, encompassing the many varieties of fermented foods, is intended to clarify what is (and is not) a fermented food. The distinction between fermented foods and probiotics is further clarified. The panel also addressed the current state of knowledge on the safety, risks and health benefits, including an assessment of the nutritional attributes and a mechanistic rationale for how fermented foods could improve gastrointestinal and general health. The latest advancements in our understanding of the microbial ecology and systems biology of these foods were discussed. Finally, the panel reviewed how fermented foods are regulated and discussed efforts to include them as a separate category in national dietary guidelines

The International Scientific Association for Probiotics and Prebiotics (ISAPP) consensus statement on fermented foods

An expert panel was convened in September 2019 by The International Scientific Association for Probiotics and Prebiotics (ISAPP) to develop a definition for fermented foods and to describe their role in the human diet. Although these foods have been consumed for thousands of years, they are receiving increased attention among biologists, nutritionists, technologists, clinicians and consumers. Despite this interest, inconsistencies related to the use of the term ‘fermented’ led the panel to define fermented foods and beverages as “foods made through desired microbial growth and enzymatic conversions of food components”. This definition, encompassing the many varieties of fermented foods, is intended to clarify what is (and is not) a fermented food. The distinction between fermented foods and probiotics is further clarified. The panel also addressed the current state of knowledge on the safety, risks and health benefits, including an assessment of the nutritional attributes and a mechanistic rationale for how fermented foods could improve gastrointestinal and general health. The latest advancements in our understanding of the microbial ecology and systems biology of these foods were discussed. Finally, the panel reviewed how fermented foods are regulated and discussed efforts to include them as a separate category in national dietary guidelines

Dust depletion, chemical uniformity and environment of CaII H&K quasar absorbers

CaII 3934,3969 absorbers, which are likely to be a subset of damped Lyman alpha systems, are the most dusty quasar absorbers known, with an order of magnitude more extinction in E(B-V) than other absorption systems. There is also evidence that CaII absorbers trace galaxies with more ongoing star-formation than the average quasar absorber. Despite this, relatively little is known in detail about these unusual absorption systems. Here we present the first high resolution spectroscopic study of 19 CaII quasar absorbers, in the range 0.6=0.2A. Their general depletion patterns are similar to measurements in the warm halo phase of the Milky Way and Magellanic Clouds ISM. Dust depletions and alpha-enrichments profiles of sub-samples of 7 and 3 absorbers, respectively, are measured using a combination of Voigt profile fitting and apparent optical depth techniques. Deviations in [Cr/Zn]~0.3+-0.1dex and in [Si/Fe]>~0.8+-0.1dex are detected across the profile of one absorber, which we attribute to differential dust depletion. The remaining absorbers have <0.3dex (3sigma limit) variation in [Cr/Zn], much like the general DLA population, though the dustiest CaII absorbers remain relatively unprobed in our sample. A limit on electron densities in CaII absorbers, n_e<0.1cm^-3, is derived using the ratio of neutral and singly ionised species, assuming a MW-like radiation field. These electron densities may imply hydrogen densities sufficient for the presence of molecular hydrogen in the absorbers. The CaII absorber sample comprises a wide range of velocity widths, v_90=50-470km/s, and velocity structures, thus a range of physical models for their origin, from simple discs to galactic outflows and mergers, would be required to explain the observations.Comment: Minor revision after publication proofs to ensure arXiv version of paper matches MNRAS published versio

Minimally Invasive Mitral Valve Surgery III: Training and Robotic-Assisted Approaches.

Minimally invasive mitral valve operations are increasingly common in the United States, but robotic-assisted approaches have not been widely adopted for a variety of reasons. This expert opinion reviews the state of the art and defines best practices, training, and techniques for developing a successful robotics program