Miracle-dz/UniFAR-FTUs huggingface dataset:
Correction to “Iron silicides at pressures of the Earth's inner core”

[1] The Earth’s core is expected to contain around 10 wt % light elements (S, Si, O, possibly C, H, etc.) alloyed with Fe and Ni. Very little is known about these alloys at pressures and temperatures of the core. Here, using the evolutionary crystal structure prediction methodology, we investigate FeSi compounds at pressures of up to 400 GPa, i.e. covering the pressure range of the Earth’s core. Evolutionary simulations correctly find that at atmospheric pressure the known non-trivial structure with P213 symmetry is stable, while at pressures above 20 GPa the CsCl-type structure is stable. We show that among the possible Fe silicides (Fe3Si, Fe2Si, Fe5Si3, FeSi, FeSi2 and FeSi3) only FeSi with CsCltype structure is thermodynamically stable at core pressures, while the other silicides are unstable to decomposition into Fe + FeSi or FeSi + Si. This is consistent with previous works and suggests that Si impurities contribute to stabilization of the body-centered cubic phase of Fe in the inner core. Citation: Zhang, F. , and A. R. Oganov (2010), Iron silicides at pressures of the Earth’s inner core, Geophys. Res. Lett. , 37, L02305, doi:10.1029/2009GL041224.
Political Challenge in Latin America: Rebellion and Collective Protest in an Era of Democratization

Democratization is expected to quell violent political challenge while opening channels for nonviolent opposition. By offering the opportunity for revolutionary groups to promote their interests and seek change without recourse to violence, democracies are expected to stifle violent opposition with inclusion. Yet, revolutionary groups have continued to threaten governments throughout the 1980s and 1990s, a period marked by extensive democratic opening. Meanwhile, democracy is tied to the mobilization of civil society, opening channels for nonviolent challenge to government, arguably increasing instability, especially in the short term. Using a negative binomial event-count model on a pooled cross-sectional sample of 18 Latin American countries for the period 1980-93, this article examines the effects of an array of theoretical determinants on occurrences of violent rebellion and nonviolent collective protest. For rebellion, some traditional expectations are supported, including the role of state capacity and repression, although social development is also identified as an important determinant. For collective protest, repression exerts a demobilizing influence, as expected. Of primary interest, democracy significantly impacts both rebellion and collective protest, although its effect is surprising: increasing democracy promotes violent rebellion while quelling protest overall in the time period under analysis, supporting work suggesting a continuation of political challenge despite recent democratization.
A grounded theory investigation to build a preliminary model of the transformational process of how clinical psychologists may evolve into compassionate leaders

Clinical leadership and compassionate care in the NHS have become priorities in influential papers and policies. There is a paucity of research to underpin conceptualisations of compassionate leadership and of leadership development in clinicians in the NHS, particularly clinical psychologists who may be able to lead in healthcare environments in unique ways due to the values and competencies of their profession. This present study sought to use a grounded theory approach to build a preliminary model of the transformational process of how clinical psychologists may evolve into compassionate leaders. Twelve clinical psychologists from varied specialities and with different years of experience took part in semi-structured qualitative interviews. Their data were analysed using a grounded theory methodology involving open, selective and theoretical coding. The findings indicate that psychologists may develop as leaders through their personalities and sense of mission, through reaching out to and being accepted by colleagues and through leading by doing. Participants who became compassionate in leadership seemed to be enabled by reflection, supervision and being treated with compassion. These findings are discussed with regard to extant theory and literature. Clinical and theoretical implications and a methodological critique are discussed.
Simultaneous measurements of lactate turnover rate and umbilical lactate uptake in the fetal lamb.

Lactic acid represents a major exogenous nutrient for the developing fetal lamb in utero. Our study was undertaken (a) to quantitate the net consumption of lactate by the fetus, (b) to quantitate the net lactate production and metabolism by the placenta, and (c) to compare the net fetal lactate consumption with fetal lactate use, measured simultaneously with radioactive tracers. 14 pregnant sheep were prepared with catheters in the maternal femoral artery and uterine vein and in the fetal aorta and umbilical vein. By simultaneous application of the Fick principle to the uterine and umbilical circulations, placental glucose consumption and placental lactate production were rapid, averaging 39.8 +/- 5.1 and 11.8 +/- 0.7 mg.min-1. Net lactate umbilical uptake averaged 1.95 +/- 0.16 mg-1.kg. min-1. During infusion of L-[14C(U)]lactate, fetal lactate turnover was much more rapid, averaging 6.5 +/- 0.8 mg.kg-1.min-1, and lactate utilization within the anatomic fetus was 5.9 +/- 0.7 mg.kg-1.min-1. During infusion of tracer glucose, endogenous fetal lactate production from glucose and nonglucose substrates averaged 3.0 and 1.5 mg.kg-1.min-1, respectively. The present studies have quantitated under well oxygenated, steady-state conditions, the rapid placental metabolism and production of lactate, the net fetal consumption of lactate, and the rapid endogenous fetal lactate production from glucose and nonglucose substrates.
SOCIAL NETWORKING: FRIEND OR FOE? A STUDY OF CYBERBULLYING AT A

This study investigates the experiences and perceptions of 168 undergraduate college students regarding cyberbullying, including a focus on the role of social networking in cyberbullying incidents. Personal experiences of students were explored, including experiences that students have had as victims of cyberbullying and as witnesses of cyberbullying incidents involving others. Research found that while most cyberbullying incidents occur during high school, cyberbullying is continuing at the university level. In addition, social networking sites such as Facebook, along with text messaging, are the primary technologies being used for online harassment.
Experimental illumination of a forest: no effects of lights of different colours on the onset of the dawn chorus in songbirds

Light pollution is increasing exponentially, but its impact on animal behaviour is still poorly understood. For songbirds, the most repeatable finding is that artificial night lighting leads to an earlier daily onset of dawn singing. Most of these studies are, however, correlational and cannot entirely dissociate effects of light pollution from other effects of urbanization. In addition, there are no studies in which the effects of different light colours on singing have been tested. Here, we investigated whether the timing of dawn singing in wild songbirds is influenced by artificial light using an experimental set-up with conventional street lights. We illuminated eight previously dark forest edges with white, green, red or no light, and recorded daily onset of dawn singing during the breeding season. Based on earlier work, we predicted that onset of singing would be earlier in the lighted treatments, with the strongest effects in the early-singing species. However, we found no significant effect of the experimental night lighting (of any colour) in the 14 species for which we obtained sufficient data. Confounding effects of urbanization in previous studies may explain these results, but we also suggest that the experimental night lighting may not have been strong enough to have an effect on singing.
Thoracic and Cardiac Imaging / Imagerie cardiaque et imagerie thoracique Breast Cancer Close to the Nipple : Does This Increase the Risk of Nodal Metastasis at Diagnosis ?

Background: Previous studies of patients with invasive breast cancer examined, with mixed results, tumour location as a predictor of axillary lymph node metastasis. This study assessed whether tumour location in relation to the nipple impacts the presence of axillary lymph node metastasis at the time of diagnosis. Methods: A retrospective review was undertaken of the medical records and available imaging of 285 patients diagnosed with invasive breast cancer between January 2001 to June 2007 at Boston University Medical Center. The incidence of axillary lymph node metastasis was correlated with tumour location in relation to the posterior nipple line to control for variation in breast size. Bivariate analysis identified significant variables that were applied to a multiple logistic regression model. Results: Axillary lymph node metastasis was not significantly associated with tumour proximity to the nipple. In the multivariate logistic regression analysis, known prognostic factors for axillary metastasis, such as surgical size, lymphovascular invasion, and age of diagnosis, were significant, whereas breast density, palpability, and histologic grade were no longer significant. Conclusions: Our study found that there was no evidence that correlates intramammary tumour proximity to the nipple with the presence of axillary lymph node metastasis at diagnosis. However, known prognostic factors, such as lymphovascular invasion, surgical size, and younger age at diagnosis, are strong independent predictors for axillary lymph node involvement.
Acquiring writing revision skill : Shifting from process to outcome self-regulatory goals

Eighty-four high school girls practiced combining a series of kernel sentences into a single nonredundant sentence. The outcome goal focused on minimizing the number of words in the combined sentence, whereas process goal emphasized a 3-step method for combining kernel sentences. It was found that girls who shifted goals sequentially from process to outcome goals surpassed classmates who adhered to only process goals who, in turn, exceeded classmates using only outcome goals in posttest writing revision skill, self-reactions, self-efficacy perceptions, and intrinsic interest in this skill. Attributions of deficient performance to strategy choice was positively correlated with self-reactions, self-efficacy beliefs, and intrinsic interest whereas attributions to ability or effort were negatively correlated with these measures. Self-recording enhanced writing skill, self-efficacy, and self-reaction beliefs significantly.
Additive control of stochastic linear systems with finite horizon

We consider a dynamic system whose state is governed by a linear stochastic differential equation with time-dependent coefficients. The control acts additively on the state of the system. Our objective is to minimize an integral cost which depends upon the evolution of the state and the total variation of the control process. It is proved that the optimal cost is the unique solution of an appropriate free boundary problem in a space-time domain. By using some decomposition arguments, the problems of a two-sided control, i.e. optimal corrections, and the case with constraints on the resources, i.e. finite fuel, can be reduced to a simpler case of only one-sided control, i.e. a monotone follower. These results are applied to solving some examples by the so-called method of similarity solutions.
The effect of the enhanced cognitive interview on recall and confidence in elderly adults

Early research with the cognitive interview suggested that it is a useful investigative technique to obtain information from eyewitnesses to crime. The cognitive interview appeared to increase the recall of correct information without a concomitant increase in the recall of incorrect details or confabulation. More recent research has failed to replicate original findings and has frequently reported increased recall of incorrect information and/or confabulation. Although the cognitive interview has been used with diverse interviewees, it has rarely been used with elderly adults, a group known to present difficulties as eyewitnesses. This study compared the efficacy of the enhanced cognitive interview with a structured interview in obtaining information from younger (18–50 years) and older (60+ years) adults who viewed a film of a simulated crime (armed robbery). The memory performance of participants was investigated in relation to total correct, incorrect and confabulated information recalled about key aspects of a crime and the offenders. Additionally, the confidence of participants' recall of information was investigated. Results from the current study indicated that recall of correct, incorrect and confabulated information was not significantly different in the cognitive and structured interview conditions. However, younger adults recalled significantly more correct information than older adults, although both age groups did not differ significantly in the amount of incorrect information recalled or the number of confabulations. Confidence in recall of information was not significantly related to age or interview condition. The implications of the results for the use of the cognitive interview with elderly eyewitnesses are discussed.
The effect of the mode of delivery on neonatal thyroid function

Background. We aimed to investigate the effect of the mode of delivery and the type of anesthesia on postnatal thyroxine (T4), free T4 (f-T4) and thyroid-stimulating hormone (TSH) in a large number of healthy full-term neonates. Methods. Serum samples for T4, TSH and f-T4 were drawn from neonates at the time of discharge (postnatal days 1–7) in a pilot thyroid-screening program. Six hundred and thirty-eight neonates were grouped as: vaginal delivery (VD; 332), elective cesarean section (elective C/S; 252) and emergency cesarean section (emergency C/S; 54). The elective C/S group was subdivided into local and general anesthesia groups to investigate the influence of the type of anesthesia used on thyroid function. Results. Mean±SD serum T4, TSH and f-T4 levels tended to be higher in the VD group compared to the elective C/S group at almost all time points. However the differences did not reach statistical significance, except for the T4 levels at postnatal day 3 in the VD group, which was higher (195.6±37.3 nmol/L) compared to the elective C/S group (160.9±34.8 nmol/L) (p < 0.001). The only difference in the anesthesia groups was the slightly higher f-T4 levels from postnatal day 4 in the local anesthesia group compared to the general anesthesia group. Conclusions. The mode of delivery or type of anesthesia does not have considerable influence on postnatal thyroid functions in the neonates, although minor differences exist. Therefore similar cut-off values can be used for thyroid screening of term newborns regardless of the mode of delivery or type of anesthesia used.
Addressing the Endogeneity of Economic Evaluations in Models of Political Choice

Subjective measures used in models of political choice are typically open to criticism with respect to their endogeneity. Economic perceptions have been subject to particular criticism in this respect. We address these concerns through the application of estimation procedures introduced from econometrics and the introduction of a new measure of economic perceptions that acts as an instrumental variable. Together, these eliminate simultaneity bias and bias due to unobserved heterogeneity, reduce omitted-variable bias, and reduce noise/measurement error in economic perceptions. An analysis of three-wave panel surveys produces estimates of the effect of economic perceptions on party evaluation that are not biased upward by the presence of endogeneity and that help address the discrepancy between competing subjective models of economic effects on government approval.
Computed Basis Functions for Finite Element Analysis Based on Tomographic Data

In bioelectromagnetics, the structures in which the electromagnetic field is to be computed are sometimes defined by a fine grid of voxels (3-D cells) whose tissue types are obtained by tomography. A novel finite element method is proposed for such cases. A simple, regular mesh of cube elements is constructed, each containing the same, integer number of voxels. There may be several different tissues present within an element, but this is accommodated by computing element basis functions that approximately respect the interface conditions between different tissues. Results are presented for a test model of 1283 voxels, consisting of nested dielectric cubes, driven by specified charges. The electrostatic potential computed with the new method agrees well with that of a conventional finite element code: the rms difference along the sample line is 1.5% of the highest voltage. Results are also presented for the potential due to a current dipole placed in a brain model of 181 × 217 × 181 voxels, derived from MRI data. The new method gives potentials that are different to those obtained by treating each voxel as an element by 1% of the peak voltage, yet the global finite element matrix has a dimension which is more than 50 times smaller.
Hybrid simulation of power systems and ICT for real-time applications

With the rise of smart grid technologies, the interdependencies of ICT and power systems become increasingly important in both transmission and distribution networks. For the design of time-critical applications, simulation tools for an integrated analysis of these domains are needed. In the case of electrical transmission systems, high-performance ICT solutions and fast controllable power equipment enable a new era of dynamic power system operation whereas applications for this purpose need to be investigated with a special focus on their real-time performance. This paper presents a novel, modular co-simulation environment for comprehensive analysis of mutual effects, taking into account communication networks, IT processing and power system response. This hybrid simulation environment has been developed with a focus on the evaluation of the real-time performance of wide-area monitoring, protection and control (WAMPAC) applications, nonetheless, it is applicable to a variety of smart grid applications in transmission and distribution networks. The simulator architecture takes into account various standards from different areas of research - such as IEEE 1516-2000 (High-Level Architecture), IEC 61850, OPC and CIM - in order to provide a highly flexible simulation environment and to enable development of applications close to industrial implementation.
The natural work-stealing algorithm is stable

In this paper we analyse a very simple dynamic work-stealing algorithm. In the work-generation model, there are n generators which are arbitrarily distributed among a set of n processors. During each time-step, with probability /spl lambda/, each generator generates a unit-time task which it inserts into the queue of its host processor. After the new tasks are generated, each processor removes one task from its queue and services it. Clearly, the work-generation model allows the load to grow more and more imbalanced, so, even when /spl lambda/<1, the system load can be unbounded. The natural work-stealing algorithm that we analyse works as follows. During each time step, each empty processor sends a request to a randomly selected other processor. Any non-empty processor having received at least one such request in turn decides (again randomly) in favour of one of the requests. The number of tasks which are transferred from the non-empty processor to the empty one is determined by the so-called work-stealing function f. We analyse the long-term behaviour of the system as a function of /spl lambda/ and f. We show that the system is stable for any constant generation rate /spl lambda/<1 and for a wide class of functions f. We give a quantitative description of the functions f which lead to stable systems. Furthermore, we give upper bounds on the average system load (as a function of f and n).
Voting in Combinatorial Domains

This chapter addresses preference aggregation and voting on domains which are the Cartesian product (or sometimes, a subset of the Cartesian product) of finite domain values, each corresponding to an issue, a variable, or an attribute. As seen in other chapters of this handbook, voting rules map a profile (usually, a collection of rankings, see Chapter 1) to an alternative or a set of alternatives. A key question has to do with the structure of the set of alternatives. Sometimes, this set has a simple structure and a small cardinality (e.g., in a presidential election). But in many contexts, it has a complex combinatorial structure.
Memory Efficient Minimum Substring Partitioning

Massively parallel DNA sequencing technologies are revolutionizing genomics research. Billions of short reads generated at low costs can be assembled for reconstructing the whole genomes. Unfortunately, the large memory footprint of the existing de novo assembly algorithms makes it challenging to get the assembly done for higher eukaryotes like mammals. In this work, we investigate the memory issue of constructing de Bruijn graph, a core task in leading assembly algorithms, which often consumes several hundreds of gigabytes memory for large genomes. We propose a disk-based partition method, called Minimum Substring Partitioning (MSP), to complete the task using less than 10 gigabytes memory, without runtime slowdown. MSP breaks the short reads into multiple small disjoint partitions so that each partition can be loaded into memory, processed individually and later merged with others to form a de Bruijn graph. By leveraging the overlaps among the k-mers (substring of length k), MSP achieves astonishing compression ratio: The total size of partitions is reduced from Θ(kn) to Θ(n), where n is the size of the short read database, and k is the length of a k-mer. Experimental results show that our method can build de Bruijn graphs using a commodity computer for any large-volume sequence dataset.
Multicellular Architecture of Malignant Breast Epithelia Influences Mechanics

Cell–matrix and cell–cell mechanosensing are important in many cellular processes, particularly for epithelial cells. A crucial question, which remains unexplored, is how the mechanical microenvironment is altered as a result of changes to multicellular tissue structure during cancer progression. In this study, we investigated the influence of the multicellular tissue architecture on mechanical properties of the epithelial component of the mammary acinus. Using creep compression tests on multicellular breast epithelial structures, we found that pre-malignant acini with no lumen (MCF10AT) were significantly stiffer than normal hollow acini (MCF10A) by 60%. This difference depended on structural changes in the pre-malignant acini, as neither single cells nor normal multicellular acini tested before lumen formation exhibited these differences. To understand these differences, we simulated the deformation of the acini with different multicellular architectures and calculated their mechanical properties; our results suggest that lumen filling alone can explain the experimentally observed stiffness increase. We also simulated a single contracting cell in different multicellular architectures and found that lumen filling led to a 20% increase in the “perceived stiffness” of a single contracting cell independent of any changes to matrix mechanics. Our results suggest that lumen filling in carcinogenesis alters the mechanical microenvironment in multicellular epithelial structures, a phenotype that may cause downstream disruptions to mechanosensing.