bluuebunny/crossref_metadata_2025_split huggingface dataset:
Market knowledge: Evidence from importers
Authors: Erbahar Aksel 
Published: November 2018

AbstractPrevious firm‐level literature established that there are substantial costs of entry into new export markets. Chaney (The American Economic Review, 104, 2014, 3600) opens the black‐box of entry costs by building a dynamic network model of international trade where firms acquire customers in new destinations through their existing customers in other destinations. Following his conjecture, this paper examines whether firms use their existing suppliers in a destination to find their first clients in those markets. I use a disaggregated data set on Turkish firms' exports and imports for the 2003–08 period, and investigate the effect of import experience on export entry. By identifying import experience using instrumental variables, and shutting down productivity channels with firm‐year fixed effects, I find that having a supplier in the destination country raises the probability of starting to export to that country by 5.5 percentage points on average, revealing a “market knowledge” phenomenon. The paper's main contribution to the literature is finding that firms' country‐specific import experience increases the likelihood of export‐market entry. Digging further to explore heterogeneous effects, I find that this effect does not exist when trading with low‐income countries, but it increases with the destination country's size, proximity, language similarity and the size of its Turkish immigrant community. Moreover, the strength of the firm's relationship with its supplier as proxied by several variables such as the share of imported products that are differentiated increases the probability of export‐market entry.
One‐step synthesis of NiO nano‐photocatalyst by wire explosion process and its application in photocatalytic degradation of Methyl tert‐butyl ether
Authors: Yazdani Davoud , Zinatizadeh Ali Akbar , Joshaghani Mohammad 
Published: November 2018

AbstractThe use of the gasoline additive methyltert‐butyl ether (MTBE) has caused serious concern about groundwater and surface water contamination. In this study, UV light/ NiO nano‐photocatalyst (NiONP) system was firstly used to degradation of MTBE in contaminated water. A low‐cost and environmentally clean exploded‐wire plasma technique based on cheap solid nickel source is developed for preparation of NiONP. Optical, magnetic and physicochemical properties were successfully characterized using DRS, VSM, XRD, SEM, EDX, TEM and BET techniques. The NiONP exhibits excellent photocatalytic degradation ability of MTBE. The degradation process was monitored during the photocatalytic reaction by gas chromatography‐mass spectrometry (GC‐MS). It has been found that MTBE undergoes a series of intermediate step, which leads to form a number of intermediate products, mainly acetone, formic acid and t‐butyl formate (TBF). According to the results of the intermediates determination, a possible pathway degradation of MTBE was also proposed.
West Nile virus infection in horses in Saudi Arabia (in 2013–2015)
Authors: Hemida Maged G. , Perera Ranawaka A. P. M. , Chu Daniel K. W. , Ko Ronald L. W. , Alnaeem Abdelmohsen A. , Peiris Malik 
Published: November 2018

AbstractWest Nile virus (WNV) is an important emerging zoonotic arbovirus giving rise to clinical syndromes of varying severity in humans and horses. Culex mosquitoes are the main vector. Although WNV has been reported in many countries in the Middle East and Asia, little is known about its prevalence in equine populations in the Arabian Peninsula. We have carried out a serological study on 200 horses to assess WNV infection in the Eastern and Central regions of Saudi Arabia in 2013–2015. Sera were tested for the presence of WNV antibodies in parallel using a commercial enzyme‐linked immunosorbent assay (ELISA) kit and microneutralization (MN) tests. In comparison with the MN assay used as “gold standard,” we find the ELISA had a sensitivity of 94.7% and specificity of 80.1%. The prevalence of WNV neutralizing antibody ranged from 5 (17.3%) of 29 sera collected in Riyadh up to 15 (55.6%) of 27 sera collected from Al‐Qateef. These findings highlight the need to be aware of the possibility of WNV disease in humans and horses presenting with central nervous system disease in the Kingdom of Saudi Arabia.
The dependence of elastic properties of Cr2AC(A = Al, Ge) compounds on pressure by First-principle calculation
Authors: Shao Ya Ping , Ling Weidong , Duan JiZheng , Yang Yang , Jiang Xin , Duan Wen Shan 
Published: November 2018

MAX phases captured attention ever since they were synthesized. They are suited for different applications, especially in high-temperature and extreme environments. So knowledge of mechanical properties is essential for our applications of MAX phases in different situations. Cr2AC (A = Al, Ge) compounds belong to M2AX phases. But, few of their physical properties have been studied. This work demonstrated the compression behavior of Cr2AC (A = Al, Ge) by first-principles method. The elastic constants were calculated in the range of 0–50 GPa, it is shown that they satisfy the requirement of mechanical stability. The values of bulk moduli, shear moduli, Young’s moduli, Possion’s ratio and Lame’s constant were calculated. We also studied brittleness/ductility of Cr2AC(A = Al, Ge). For the more, we studied the dependence of a/a0, c/c0 and bulk moduli on the pressure below 50 GPa. In the end, we calculated the Mulliken bond overlap and theoretical hardness. We also discussed the bonding and antibonding.
THE EFFECTS OF SQUARE DANCING ON BONE MINERAL DENSITY AND BONE TURNOVER MARKERS IN PATIENTS WITH POSTMENOPAUSAL OSTEOPOROSIS
Authors: QIN JINZE , RONG XIAOXU , ZHU GUOXING , JIANG YU 
Published: November 2018

Objective: To study the effects of square dance on bone mineral density (BMD) and bone turnover markers in patients with postmenopausal osteoporosis. Methods: Fifty postmenopausal women (aging 45–60) with osteoporosis were randomly assigned to a research group and a control group. The patients in the research group received 600[Formula: see text]mg of calcium combined with square dance (5 times a week, 30 to 60 minutes each time) for 6 months while those in the control group only received 600[Formula: see text]mg of calcium. BMD, changes in bone turnover markers and bone pain were assessed before and after the treatment. Results: (1) After the 6-month treatment, BMD of L[Formula: see text] and the femoral neck significantly increased in the research group ([Formula: see text]). No significant change was observed in BMD of the Ward’s region. BMD in the control group did not change significantly ([Formula: see text]). (2) No significant difference was found in serum levels of calcium, phosphorus and alkaline phosphatase between the two groups both before and after the treatment ([Formula: see text]). Serum levels of P1NP had a significant increase, while [Formula: see text]-CTX’s level did not change significantly. (3) The bone pain in both groups has been effectively relieved. The pain in the research group was relieved significantly compared to the control group. Conclusions: By improving the BMD and relieving the pain, square dancing can exert positive effects on women with postmenopausal osteoporosis. Square dancing may become a feasible strategy for osteoporosis prevention and treatment.
Kinematic analysis of bimanual movements during food handling by head-fixed rats
Authors: Igarashi Masakazu , Wickens Jeff 
Published: November 2018

Bimanual coordination, in which both hands work together to achieve a goal, is crucial for the basic needs of life, such as gathering and feeding. Such coordinated motor skill is highly developed in primates, where it has been most extensively studied. Rodents also exhibit remarkable dexterity and coordination of forelimbs during food handling and consumption. However, rodents have been less commonly used in the study of bimanual coordination because of limited quantitative measuring techniques. In this article we describe a high-resolution tracking system that enables kinematic analysis of rat forelimb movement. The system is used to quantify forelimb movements bilaterally in head-fixed rats during food handling and consumption. Forelimb movements occurring naturally during feeding were encoded as continuous three-dimensional trajectories. The trajectories were then automatically segmented and analyzed, using a novel algorithm, according to the laterality of movement speed or the asymmetry of movement direction across the forelimbs. Bilateral forelimb movements were frequently observed during spontaneous food handling. Both symmetry and asymmetry in movement direction were frequently observed, with symmetric bilateral movements quantitatively more common. The proposed method overcomes a limitation in the precise quantification of bimanual coordination in rodents. This enables the use of powerful rodent-based research tools such as optogenetics and chemogenetics in the further investigation of neural mechanisms of bimanual coordination. NEW & NOTEWORTHY We describe a new method for quantifying and classifying three-dimensional, bilateral forelimb trajectories in head-fixed rats. The method overcomes limits on quantifying bimanual coordination in rats. When applied to kinematic analysis of food handling behavior, continuous forelimb trajectories were automatically segmented and classified. Bilateral forelimb movements were observed more frequently than unilateral movements during spontaneous food handling. Both symmetry and asymmetry in movement direction were frequently observed. However, symmetric bilateral forelimb movements were more common.
The Power of Nations: Measuring What Matters
Authors: Beckley Michael 
Published: November 2018

Abstract
Power is the most important variable in world politics, but scholars and policy analysts systematically mismeasure it. Most studies evaluate countries’ power using broad indicators of economic and military resources, such as gross domestic product and military spending, that tally their wealth and military assets without deducting the costs they pay to police, protect, and serve their people. As a result, standard indicators exaggerate the wealth and military power of poor, populous countries, such as China and India. A sounder approach accounts for these costs by measuring power in net rather than gross terms. This approach predicts war and dispute outcomes involving great powers over the past 200 years more accurately than those that use gross indicators of power. In addition, it improves the in-sample goodness-of-fit in the majority of studies published in leading journals over the past five years. Applying this improved framework to the current balance of power suggests that the United States’ economic and military lead over other countries is much larger than typically assumed, and that the trends are mostly in America's favor.
Reproductive status and burrow characteristics of females of the fiddler crab Tubuca rosea (Tweedie, 1937) (Brachyura, Ocypodidae) in southern Thailand
Authors: Keeratipattarakarn Kanitta , Tina Fahmida Wazed , Jaroensutasinee Mullica , Jaroensutasinee Krisanadej 
Published: November 2018

AbstractWe investigated the burrow characteristics (shapes, diameters, total and horizontal lengths, total depths, ground and mid angles, and volumes) of 39 large-sizedTubuca rosea(Tweedie, 1937) females (22 ovigerous; 17 non-ovigerous). We observed I- and J-shaped burrows in both ovigerous and non-ovigerous females, with higher numbers of J-shaped burrows in ovigerous females. However, in non-ovigerous females, I- and J-shaped burrow numbers were not different. Other burrow characteristics had higher values in ovigerous females than in non-ovigerous females. In ovigerous females, I- and J-shaped burrows were not different in diameters, total lengths, total depths, or volumes, but horizontal lengths, ground angles and mid angles were higher in J-shaped burrows. In non-ovigerous females, burrow characteristics (except diameter) were higher in J-shaped burrows than in I-shaped burrows. Our results show for the first time that burrow characteristics differ based on the reproductive status of female fiddler crabs inT. rosea.
Three new species of Pontellopsis (Copepoda, Calanoida) from Indonesian waters, with notes on their species-groups
Authors: Mulyadi  
Published: November 2018

Abstract
Three new species of Pontellopsis from Indonesian waters are herein described. Pontellopsis celebensis n. sp. is distinguishable by its very elongate Ur1 armed with a pair of anterolateral setules and the symmetrical P5 in the female; the right posterior corner of Pdg5 modified into a long, sickle-like process in the male. Pontellopsis bispinata n. sp. is characterized by a pair of anterolateral setules on Ur1 and the form of P5 in the female; the right posterior corner of Pdg5 is modified into a long, straight, sword-like process in the male.
Pontellopsis rajaensis n. sp. is described from female specimens only. It is distinguished by having the posterior corners of Pdg5 modified into rounded lobes and the form of P5. The establishment of five new species-groups of Pontellopsis, i.e., the P. herdmani-group, the P. macronyx-group, the P. pexa-group, the P. regalis-group, and the P. scotti-group, and in addition species as yet unassigned to groups, is here proposed.
Carapace asymmetries in crabs
Authors: Spani Federica , Scalici Massimiliano 
Published: November 2018

AbstractThrough the geometric morphometric approach of the landmark-based method applied on adult right-handed specimens ofCarcinus aestuarii,Liocarcinus depuratorandPotamon fluviatile, statistical analyses showed significant outcomes for fluctuating asymmetry in the three studied species, and directional asymmetry only inP. fluviatile(that showed a less convex carapace shape on the right side, where larger chela occurred). Although these findings may be correlated to some environmental constraints, such as soil composition, refuge occurrence and predatory pressure, also other interpretations may be proposed.
Two new species of gammarid amphipods from Tunisian fresh waters (Amphipoda, Gammaridae)
Authors: Ayati Khaoula , Dhaouadi Sonia , Mahmoudi Ezzeddine , Piscart Christophe 
Published: November 2018

Abstract
This study describes two new species of the genus Echinogammarus from springs and rivers located in northern Tunisia. These two species are related to the Echinogammarus simoni-group, but differ from those species in terms of several characteristics, such as a 3-articulated accessory flagellum of the first antennae, the lack of a dense setation on the second antennae, the presence of lateral setae on the telson and the lack of plumose setae on uropod 3. The first species, Echinogammarus carthaginiensis n. sp., is easily distinguishable from the second, Echinogammarus tunetanus n. sp., by the setation on the mandibular palp and gnathopods and the relative length of uropods 1 and 3. A full description of the two new species and information about their distribution is given in this paper.
An anomalous specimen of the deep-sea shrimp Glyphocrangon aculeata A. Milne-Edwards, 1881 (Decapoda, Caridea) from the South Atlantic Ocean
Authors: Alves-Júnior F. A. , Neumann-Leitão S. , Araújo M. S. L. C. , Souza-Filho J. F. 
Published: November 2018

AbstractIn this paper, we report some morphological abnormalities for the deep-sea shrimpGlyphocrangon aculeataA. Milne-Edwards, 1881, collected from the western South Atlantic. All specimens analysed herein were collected in Potiguar Basin, located in northeastern Brazil, through bottom trawls along the continental slope between 150 and 2068 m depth in 2009 and 2011. Out of 59 specimens, one ovigerous female, collected at 1074 m depth, was registered with abnormalities in some regions of the carapace, abdomen and telson. Factors such as genetic mutations, nutritional alterations, or deformities during ecdysis are suggested as being the most probable cause of the deformities reported here.
The Consistency of MJO Teleconnection Patterns: An Explanation Using Linear Rossby Wave Theory
Authors: Tseng Kai-Chih , Maloney Eric , Barnes Elizabeth 
Published: November 2018

AbstractThe Madden–Julian oscillation (MJO) excites strong variations in extratropical atmospheric circulations that have important implications for subseasonal-to-seasonal (S2S) prediction. A previous study showed that particular MJO phases are characterized by a consistent modulation of geopotential heights in the North Pacific and adjacent regions across different MJO events, and demonstrated that this consistency is beneficial for extended numerical weather forecasts (i.e., lead times of two weeks to one month). In this study, we examine the physical mechanisms that lead some MJO phases to have more consistent teleconnections than others using a linear baroclinic model. The results show that MJO phases 2, 3, 6, and 7 consistently generate Pacific–North American (PNA)-like patterns on S2S time scales while other phases do not. A Rossby wave source analysis is applied and shows that a dipole-like pattern of Rossby wave source on each side of the subtropical jet can increase the pattern consistency of teleconnections due to the constructive interference of similar teleconnection signals. On the other hand, symmetric patterns of Rossby wave source can dramatically reduce the pattern consistency due to destructive interference. A dipole-like Rossby wave source pattern is present most frequently when tropical heating is found in the Indian Ocean or the Pacific warm pool, and a symmetric Rossby wave source is present most frequently when tropical heating is located over the Maritime Continent. Thus, the MJO phase-dependent pattern consistency of teleconnections is a special case of this mechanism.
Regionally Enhanced Global (REG) 4D-Var
Authors: Herrera Michael A. , Szunyogh Istvan , Brainard Adam , Kuhl David D. , Hoppel Karl , Bishop Craig H. , Holt Teddy R. , Zhao Qingyun , Rainwater Sabrina 
Published: November 2018

Abstract
A regionally enhanced global (REG) data assimilation (DA) method is proposed. The technique blends high-resolution model information from a single or multiple limited-area model domains with global model and observational information to create a regionally enhanced analysis of the global atmospheric state. This single analysis provides initial conditions for both the global and limited-area model forecasts. The potential benefits of the approach for operational data assimilation are (i) reduced development cost, (ii) reduced overall computational cost, (iii) improved limited-area forecast performance from the use of global information about the atmospheric flow, and (iv) improved global forecast performance from the use of more accurate model information in the limited-area domains. The method is tested by an implementation on the U.S. Navy’s four-dimensional variational global data assimilation system and global and limited-area numerical weather prediction models. The results of the monthlong forecast experiments suggest that the REG DA approach has the potential to deliver the desired benefits.
Atrial fibrillation detected initially during acute medical illness: A systematic review
Authors: McIntyre William F , Um Kevin J , Cheung Christopher C , Belley-Côté Emilie P , Dingwall Orvie , Devereaux Philip J , Wong Jorge A , Conen David , Whitlock Richard P , Connolly Stuart J , Seifer Colette M , Healey Jeff S 
Published: November 2018

Objective: There is uncertainty about the incidence of and prognosis associated with atrial fibrillation that is documented for the first time in the setting of an acute stressor, such as surgery or medical illness. Our objective was to perform a systematic review of the incidence and long-term recurrence rates for atrial fibrillation occurring transiently with stress in the setting of acute medical illness. Data sources: Medline, Embase and Cochrane Central to September 2017. Study selection: We included retrospective and prospective observational studies, and randomised controlled trials. The population of interest included patients hospitalised for medical (i.e. non-surgical) illness who developed newly diagnosed atrial fibrillation. Studies were included if they included data on either the incidence of atrial fibrillation or the rate of atrial fibrillation recurrence in atrial fibrillation occurring transiently with stress patients following hospital discharge. Data extraction: Two reviewers collected data independently and in duplicate. We characterised each study’s methodology for ascertainment of prior atrial fibrillation history, atrial fibrillation during hospitalisation and atrial fibrillation recurrence after hospital discharge. Data synthesis: Thirty-six studies reported the incidence of atrial fibrillation. Ten used a prospective design and included a period of continuous electrocardiographic (ECG) monitoring. Atrial fibrillation incidence ranged from 1% to 44%, which was too heterogeneous to justify meta-analysis ( I2=99%). In post-hoc meta-regression models, the use of continuous ECG monitoring explained 13% of the variance in atrial fibrillation incidence, while care in an intensive care unit explained none. Two studies reported the long-term rate of atrial fibrillation recurrence following atrial fibrillation occurring transiently with stress. Neither of these studies used prospective, systematic monitoring. Recurrence rates at 5 years ranged from 42% to 68%. Conclusions: The incidence of atrial fibrillation with medical illness may be as high as 44%, with higher estimates in reports using continuous ECG monitoring. Within 5 years following hospital discharge, atrial fibrillation recurrence is documented in approximately half of patients; however, the true rate may be higher. Protocol registration PROSPERO CRD42016043240
Real-life use of left ventricular circulatory support with Impella in cardiogenic shock after acute myocardial infarction: 12 years AMC experience
Authors: Ouweneel Dagmar M , de Brabander Justin , Karami Mina , Sjauw Krischan D , Engström Annemarie E , Vis M Marije , Wykrzykowska Joanna J , Beijk Marcel A , Koch Karel T , Baan Jan , de Winter Robbert J , Piek Jan J , Lagrand Wim K , Cherpanath Thomas GV , Driessen Antoine HG , Cocchieri Riccardo , de Mol Bas AJM , Tijssen Jan GP , Henriques José PS 
Published: November 2018

Aims: Mortality in cardiogenic shock patients remains high. Short-term mechanical circulatory support with Impella can be used to support the circulation in these patients, but data from randomised controlled studies and ‘real-world’ data are sparse. The aim is to describe real-life data on outcomes and complications of our 12 years of clinical experience with Impella in patients with cardiogenic shock after acute myocardial infarction and to identify predictors of 6-month mortality. Methods: We describe a single-centre registry from October 2004 to December 2016 including all patients treated with Impella for cardiogenic shock after acute myocardial infarction. We report outcomes and complications and identify predictors of 6-month mortality. Results: Our overall clinical experience consists of 250 patients treated with Impella 2.5, Impella CP or Impella 5.0. A total of 172 patients received Impella therapy for cardiogenic shock, of which 112 patients had cardiogenic shock after acute myocardial infarction. The mean age was 60.1±10.6 years, mean arterial pressure was 67 (56–77) mmHg, lactate was 6.2 (3.6–9.7) mmol/L, 87.5% were mechanically ventilated and 59.6% had a cardiac arrest before Impella placement. Overall 30-day mortality was 56.2% and 6-month mortality was 60.7%. Complications consisted of device-related vascular complications (17.0%), non-device-related bleeding (12.5%), haemolysis (7.1%) and stroke (3.6%). In a multivariate analysis, pH before Impella placement is a predictor of 6-month mortality. Conclusions: Our registry shows that Impella treatment in cardiogenic shock after acute myocardial infarction is feasible, although mortality rates remain high and complications occur.