bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stable water isotopes and accumulation rates in the Union Glacier region, Ellsworth Mountains, West Antarctica, over the last 35 years
Authors: Hoffmann Kirstin , Fernandoy Francisco , Meyer Hanno , Thomas Elizabeth R. , Aliaga Marcelo , Tetzner Dieter , Freitag Johannes , Opel Thomas , Arigony-Neto Jorge , Göbel Christian Florian , Jaña Ricardo , Rodríguez Oroz Delia , Tuckwell Rebecca , Ludlow Emily , McConnell Joseph R. , Schneider Christoph 
Published: March 2020

Abstract. Antarctica is well known to be highly susceptible to atmospheric and oceanic
warming. However, due to the lack of long-term and in situ meteorological
observations, little is known about the magnitude of the warming and the
meteorological conditions in the intersection region between the Antarctic
Peninsula (AP), the West Antarctic Ice Sheet (WAIS) and the East Antarctic
Ice Sheet (EAIS). Here we present new stable water isotope data (δ18O, δD, d excess) and accumulation rates from firn cores in the Union Glacier (UG) region, located in the Ellsworth Mountains at the
northern edge of the WAIS. The firn core stable oxygen isotopes and the d excess exhibit no statistically significant trend for the period 1980–2014, suggesting that regional changes in near-surface air temperature and
moisture source variability have been small during the last 35 years.
Backward trajectory modelling revealed the Weddell Sea sector, Coats Land
and Dronning Maud Land (DML) to be the main moisture source regions for the study site throughout
the year. We found that mean annual δ18O (δD) values
in the UG region are negatively correlated with sea ice concentrations (SICs) in the northern Weddell Sea but not influenced by large-scale modes of
climate variability such as the Southern Annular Mode (SAM) and the El
Niño–Southern Oscillation (ENSO). Only mean annual d-excess values show a weak positive correlation with the SAM. On average annual snow accumulation in the UG region amounts to 0.245 m w.e. a−1 in 1980–2014 and has slightly decreased during this period. It
is only weakly related to sea ice conditions in the Weddell Sea sector and
not correlated with SAM and ENSO. We conclude that neither the rapid warming nor the large increases in snow
accumulation observed on the AP and in West Antarctica during the last
decades have extended inland to the Ellsworth Mountains. Hence, the UG
region, although located at the northern edge of the WAIS and relatively
close to the AP, exhibits rather stable climate characteristics similar to
those observed in East Antarctica.
HYPOGENE ALUNITE FROM THE EL SALVADOR DISTRICT, CHILE, INDICATES POTENTIAL FOR A BLIND PORPHYRY COPPER CENTER
Authors: Hedenquist Jeffrey W. , Watanabe Yasushi , Arribas Antonio 
Published: March 2020

AbstractSurface samples of hypogene alunite that cement late breccia bodies from the El Salvador porphyry copper district of Chile were recently dated. One alunite sample over the principal Turquoise Gulch porphyry deposit has a 40Ar/39Ar total gas age of 40.64 ± 1.04 Ma, overlapping the age of a late latite intrusion. Two other samples associated with quartz-alunite replacement of rhyolite, ~750 m southwest of the collapse zone over the block cave of the porphyry copper deposit, are distinctly younger, at 38.12 ± 0.66 and 38.04 ± 0.22 Ma (averages of duplicate analyses, with ±2σ errors).Previously reported U/Pb ages of zircons from 15 Eocene-age diorite, granodiorite, and granite porphyry intrusions have weighted mean ages that range from about 44 to 41 Ma, with peak magmatic flux interpreted at 44 to 43 Ma. Porphyry copper ores in the El Salvador district formed at about the same time as porphyry intrusions, with intrusive centers that migrated in a south-southwest direction, from the small deposits at Cerro Pelado (~44.2 Ma), to Old Camp (~43.6 Ma) and M Gulch-Copper Hill (~43.5–43.1 Ma), to the main ore deposit at Turquoise Gulch (~42 Ma). The granodiorite porphyry intrusions at Turquoise Gulch are associated with ~80% of the known copper ore of the district; they record waning stages of magmatism at 42.5 to 42.0 Ma, followed by weakly altered latite dikes at 41.6 Ma. Molybdenite in quartz veins returned Re-Os ages of 41.8 to 41.2 Ma.The two alunite samples from our study with coincident dates of ~38 Ma provide evidence for magmatic-hydrothermal activity younger than any recognized to date, consistent with the alteration overprint of quartz-alunite on older muscovite after erosion. This younger activity must have been associated with a blind intrusion, likely located south of the Turquoise Gulch deposit, based on the distribution of alteration minerals, and offset from the zoning associated with the Turquoise Gulch center. Stable isotope values (δ34S, δ18O, δD) of the ~38 Ma alunite indicate a high-temperature hypogene origin, consistent with formation in a lithocap environment that typically is located at shallow levels over and on the shoulders of porphyry copper deposits. Both observations—alteration overprint and markedly younger age of alunite—indicate the potential for porphyry copper mineralization south of Granite Gulch, as much as 1,000 m below the level of the coeval outcropping quartz-alunite replacement, perhaps near ~2,000-m elevation; this is hundreds of meters deeper than the known copper ore of Turquoise Gulch.
Mortality and Morbidity of Surgical Management of Geriatric Ankle Fractures
Authors: Gil Joseph A. , Goodman Avi D. , Kleiner Justin , Walsh Devin F. , Kosinski Lindsay R. , Hsu Raymond 
Published: March 2020

Introduction:
The incidence of geriatric ankle fractures is rising. With the substantial variation in the physiologic and functional status within this age group, our null hypothesis was that mortality and complications of open reduction and internal fixation (ORIF) between patients who are aged 65 to 79 are equivalent to ORIF in patients who are aged 80 to 89.

Methods:
Patients with ankle fracture were identified using the International Classification of Diseases, Ninth Revision, Clinical Modification diagnosis codes. Patients treated with ORIF were identified using the Current Procedural Terminology codes. Patients were divided into two age cohorts: 65 to 79 years of age and 80 to 89 years of age. The primary outcome studied was 30-day mortality. Secondary outcomes included 30-day readmission, revision surgery, surgical site infection, sepsis, wound dehiscence, pulmonary embolism, deep vein thrombosis, blood transfusion, urinary tract infection, pneumonia, stroke, myocardial infarction, renal insufficiency or failure, and length of hospital stay.

Results:
Our cohort included 2,353 ankle fractures: 1,877 were among 65 to 79 years of age and 476 were among 80 or older. Thirty-day mortality was 3.2-fold higher in the 80 to 89 years of age group compared with the 65 to 79 years of age group (1.47% versus 0.48%, P = 0.019). However, after controlling for the ASA class, 80 to 89 years of age patients no longer had a significantly higher mortality (P = 0.0647). Similarly, revision surgery rate (3.36% versus 1.81%, P = 0.036), transfusion requirement (2.94% versus 1.49%, P = 0.033), urinary tract infection (1.89% versus 0.75%, P = 0.023), and hospital length of stay (4.9 versus 2.9 days, P < 0.0001) were all significantly higher in the 80 to 90 years of age group compared with the 65 to 79 years old group. However, after controlling for the ASA class, 80 to 89 years old patients no longer had a rate of complications in comparison to the 65 to 79 years old age group.

Discussion:
After controlling for comorbidities (ie, the ASA class), no increased risk is observed for the 30-day mortality or complication rate between geriatric ankle fracture in the 65 to 79 years old and the 80 to 99 years old age groups.

Level of Evidence:
Prognostic level III, retrospective study.
Development and Validation of the Hospital for Special Surgery Anterior Cruciate Ligament Reconstruction Preoperative Expectations Survey
Authors: Kahlenberg Cynthia A. , Mehta Nabil , Fabricant Peter D. , Zhang David T. , Nguyen Joseph , Williams Riley J. , Allen Answorth A. , Nwachukwu Benedict U. 
Published: March 2020

Introduction:
Understanding and meeting the patients' preoperative expectations for anterior cruciate ligament (ACL) reconstruction (ACLR) is critical for achieving successful patient-centered outcomes. There is currently no standardized method to assess preoperative expectations of ACLR based on the patient-derived methods. The purpose of this study was to develop and test a patient-derived patient expectations survey specific to primary ACLR. We hypothesized that a valid and reliable patient-derived survey could be developed to measure these expectations and that patients would have diverse expectations before surgery.

Methods:
The Hospital for Special Surgery ACL-expectation score was developed through a four-phase iterative process that included item generation and pilot survey development, item reduction, survey readability, and survey validation. Seventy-two patients were involved in the development phase, and 80 patients were included in the validation phase. Discriminant validity testing was performed regarding age and sex. Cronbach alpha was calculated to assess the internal consistency of responses in the survey.

Results:
The final survey instrument consisted of 10 questions scored on a visual analog scale from 1 to 10, for a maximum score of 50 points. No statistically significant differences were observed in the score between men and women (P = 0.517) nor between age quartiles (P = 0.807). No statistically significant difference was observed in the scores when each sex was stratified by age quartile (P = 0.275 for men, P = 0.878 for women). Cronbach alpha for all items was 0.745, indicating excellent internal consistency. The intraclass correlation coefficient for test-retest reliability was 0.774, indicating a strong correlation.

Conclusion:
The Hospital for Special Surgery ACL-expectations score is a patient-derived, tested and reliable preoperative expectations measure with excellent psychometrics for active adults undergoing ACLR. We suggest future clinical studies in ACLR to incorporate this tool as a preoperative measure of patient expectations.
Thirty-day Outcomes After Surgery for Metastatic Bone Disease of the Extremities
Authors: Gallaway Kathryn E. , Ahn Junho , Callan Alexandra K. 
Published: March 2020

Introduction:
Metastatic bone disease of the extremities is a notable cause of morbidity and mortality. Surgical management is not curative; therefore, risks and benefits of surgery must be carefully considered. Previous studies of surgical outcomes are limited by small sample sizes because of the rare incidence of these procedures. In this study, we aim to describe the rates of complications and mortality in the first 30 days after surgical treatment of metastatic bone disease of the femur and humerus.

Methods:
A retrospective review of patients in the National Surgical Quality Improvement Program database who underwent surgery between 2005 and 2016 was performed. Demographics, comorbidities, preoperative factors, surgical parameters, and postoperative complications were extracted. The cohort was also partitioned by surgical site and surgical modality.

Results:
One thousand one hundred fifty-four patients were identified, 13.1 percent of patients experienced one or more complications within 30 days of surgery. The most common complications were urinary tract infection (2.9%), deep vein thrombosis (2.5%), pneumonia (2.4%), pulmonary embolism (2.0%), and surgical site infections (1.9%). In addition, intraoperative or postoperative bleeding requiring transfusion occurred in 32.9% of cases. The rates of unplanned readmission and unplanned revision surgery were 12.7% and 4.1%, respectively. The 30-day mortality rate was 7.1%. Femur and arthroplasty cases were associated with a higher risk of bleeding requiring transfusion. Prophylactic stabilization was associated with a lower risk of unplanned revision surgery (P = 0.015) and a lower overall complication rate (P < 0.0001).

Conclusion:
Our study demonstrates a higher 30-day mortality rate than previously reported. In additon, prophylactic stabilization of impending pathologic fractures may be associated with a lower risk of complications and unplanned revision surgery. The National Surgical Quality Improvement Program or other large database reports can help surgeons counsel patients appropriately regarding the risks and benefits of surgery.
Chopart Amputation: Questioning the Clinical Efficacy of a Long-standing Surgical Option for Diabetic Foot Infection
Authors: Brodell James D. , Ayers Brian C. , Baumhauer Judith F. , DiGiovanni Bennedict F. , Flemister A. Samuel , Ketz John P. , Oh Irvin 
Published: March 2020

Background:
Diabetic foot ulcers with associated infection and osteomyelitis often lead to partial or complete limb loss. Determination of the appropriate level for amputation based on the patient's baseline physical function, extent of infection, vascular patency, and comorbidities can be challenging. Although Chopart amputation preserves greater limb length than more proximal alternatives such as Syme or below-the-knee amputations (BKA), challenges with wound healing and prosthesis fitting have been reported. We aimed to investigate the functional and clinical outcomes of Chopart amputation combined with tendon transfers.

Methods:
We identified patients who underwent Chopart amputations for diabetic foot infections by an academic orthopaedic group between August 2013 and September 2018. Subjects completed three Patient-Reported Outcomes Measurement Information Systems (PROMIS) instruments. Incidence of postoperative complications and change in patient-reported outcomes before and after surgery were recorded.

Results:
Eighteen patients with an average age of 60.8 (range, 44 to 79) years were identified. The mean follow-up was 22.8 months (range, 6.7 to 51.0). Seventeen of the 18 total patients developed postoperative wound complications. These lead to revision amputations in 10 Chopart amputees, consisting of two Syme and eight BKAs. Half of the Chopart patients never received a prosthesis because of delayed wound healing and revision amputation. PROMIS physical function (PF) (31.1 pre-op and 28.6 post-op), pain interference (63.1 pre-op and 59.4 post-op), and depression (53.0 pre-op and 54.8 post-op) did not show significant change (P-values = 0.38, 0.29, 0.72, respectively). Pre- and post-op the PROMIS physical function scores were well below the US average.

Discussion:
In our patient cohort, 94% of patients developed postoperative wound complication. Only 44% of patients ever successfully ambulated with a prosthesis after Chopart amputation, and the others (56%) required revision amputations such as a BKA. Even after wound healing, Chopart amputees may struggle with obtaining a prosthesis suitable for ambulation. Surgeons should exercise judicious patient selection before performing Chopart amputation.

Level of Evidence:
IV, Case Series
Gemeenten organiseren kleinschaligheid: binnengemeentelijke organisatie opnieuw bekeken
Authors: Schaap Linze , Leenknegt Gert-Jan 
Published: March 2020

Municipalities organized on a small scale: a fresh look at intra-municipal organization
The vast majority of Dutch municipalities organize part of their activities on a smaller scale than those of the municipality as such: it is called intra-municipal organization. In this article an inventory is made of the existing knowledge about the effects of various forms of intra-municipal organization in the Netherlands. On the basis of recent research, this knowledge is supplemented and it is also made clear which forms of intra-municipal organization are currently used. An analysis is also made of what legal leeway Dutch municipalities have in this regard. A new and richer typology of intra-municipal organization is also being developed. Finally, the authors place the results of the research reported here in a broader perspective. In particular, they reflect on two presuppositions under many forms of intra-municipal organization, namely that activities are location specific and democracy must necessarily be of the ‘representative’ type. Its relevance for practitioners is that the article provides insight into the legal leeway for intra-municipal organization and into the design of intra-municipal organization. It also contains a reflection on the design of the intra-municipal organization.
Hulp bij het vormen van lokale coalities en colleges
Authors: Winkelmolen Dirk , van Ostaaijen Julien 
Published: March 2020

Help with forming local coalitions and boards. The local external (in)formateur in the Netherlands
In many Dutch municipalities, a ‘local external (in)formateur’ is deployed after the municipal elections. Local (in)formateurs guide the process of coalition formation. They investigate which political parties and political groups want to work together and try to bring them closer together. They can also play a role in the board formation, such as selecting alderman candidates and allocating portfolios. External (in)formateurs come ‘from outside’. They do not have an official political or official position in the municipality where they do their work at the time of their deployment as informateur. In 2014, forty percent of the municipalities made use of such an external (information) officer. However, we still know relatively little about the work of these local external informateurs, their background and results. The authors try to fill that gap on the basis of a literature study, interviews with stakeholders and a survey among 115 local external informateurs. They also consider the added value of local external (in)formateurs for local democracy. The work of local external (in)formal formateurs can contribute to a stable and well-functioning municipal executive. Nonetheless, they tend to have a rather one-sided socio-demographic profile and the desired party political experience and involvement with the municipality can be at odds with the desired independence and objectivity.
Integraliteit en interactiviteit gevraagd! Naar een gezonde leefomgeving voor jongeren
Authors: Sanders Maurits 
Published: March 2020

Integrality and interactivity required! Towards a healthy living environment for young people
Overweight children are less fit than their peers, are bullied more often and face physical problems. It is therefore important for municipal administrators to devise and implement strategies to tackle youth obesity. Increasingly, the importance of measures in the physical environment is emphasized. However, a healthy living environment does not arise automatically. It requires an integrated and interactive policy approach. Vague policy language, stubborn ideas between public and private and divisions between policy areas stand in the way of measures taken by municipalities to achieve a healthy living environment for young people. To give such a working method a chance of success: (a) more knowledge has to be gained and made accessible about health-promoting policies; (b) professionals from the social and spatial domain must be better attuned to each other; and (c) administrators must commit themselves to an institutional context in which they work integrally and interactively.
Advocaten in Europa: vertegenwoordiging op het hoogste niveau?
Authors: Hoevenaars Jos 
Published: March 2020

Lawyers in Europe: Representation at the highest level?
Research on the significance of representation indicates that lawyers contribute to positive outcomes of legal procedures not only by their substantive expertise but also by the relational expertise they bring. The latter involves understanding how to navigate the relationships involved in getting work done. In this paper these insights are used to investigate the highly specific and atypical practise of the preliminary reference procedure in the European legal system in order to reveal how lawyers deal with such an unexpected change of (legal) context. The empirical data, collected through semi-structured interviews with twenty-eight lawyers with past experience with the procedure, reveals the significant ways in which lawyers’ positive contribution to such cases is undermined by their lack of both substantive and relational expertise in pleading a case before the European Court of Justice. The fact that such cases do not necessarily fall into the hands of the professionals best equipped to plead such disputes before the Court, and the inability of the less well-off parties in particular to hire further expertise, points in the direction of a disadvantaged position for this group of litigants in having their interest represented effectively at the European level.
The alternative war on drugs: drug evictions and the (re)regulation of cannabis
Authors: Bruijn L. Michelle 
Published: March 2020

The alternative War on Drugs: drug evictions and the (re)regulation of cannabis
As a reaction to the perceived enforcement deficit of criminal law in the field of drug control, several countries implemented alternative regulatory strategies. One such strategy is the reregulating drugs, especially cannabis. Another strategy is the use of civil or administrative law to address drug-related crime. Especially the use of eviction to combat drug activities has become increasingly popular.My PhD research focuses on these two developments within the field of drug control. More specifically, on the underlying rationales for the policies on recreational cannabis, the possibilities that international law provide to regulate recreational cannabis, the legal protection against drug-related evictions, and the explanation for the use of eviction to fight drug-related activities.
Structural Phase Transitions of Hybrid Perovskites CH3NH3PbX3 (X = Br, Cl) from Synchrotron and Neutron Diffraction Data
Authors: Alberto López Carlos , Consuelo Alvarez-Galván María , Abia Carmen , Teresa Fernández-Díaz María , Antonio Alonso José 
Published: March 2020

Methylammonium (MA) lead trihalide perovskites, that is, CH3NH3PbX3 (X = I, Br, Cl), have emerged as a new class of light-absorbing materials for photovoltaic applications. Indeed, since their implementation in solar-cell heterojunctions, they reached efficiencies above 23%. From a crystallographic point of view, there are many open questions that should be addressed, including the role of the internal motion of methylammonium groups within PbX6 lattice under extreme conditions, such as low/high temperature or high pressure. For instance, in MAPbBr3 perovskites, the octahedral tilting can be induced upon cooling, lowering the space group from the aristotype Pm3¯m to I4/mcm and Pnma. The band gap engineering brought about by the chemical management of MAPb(Br,Cl)3 perovskites has been controllably tuned: the gap progressively increases with the concentration of Cl ions from 2.1 to 2.9 eV. In this chapter, we review recent structural studies by state-of-the-art techniques, relevant to the crystallographic characterization of these materials, in close relationship with their light-absorption properties.