bluuebunny/crossref_metadata_2025_split huggingface dataset:
Machine learning algorithms for soybean yield forecasting in the Brazilian Cerrado
Authors: Barbosa dos Santos Valter , Moreno Ferreira dos Santos Aline , da Silva Cabral de Moraes José Reinaldo , de Oliveira Vieira Igor Cristian , de Souza Rolim Glauco 
Published: December 2021

AbstractBACKGROUNDWe evaluated different machine learning (ML) models for predicting soybean productivity up to 1 month in advance for the Matopiba agricultural frontier (States of Maranhão, Tocantins, Piauí, and Bahia). We collected meteorological data on the NASA‐POWER platform and soybean yield on the SIDRA/IBGE base between 2008 and 2017. The ML models evaluated were random forest (RF), artificial neural networks, radial base support vector machines (SVM_RBF), linear model and polynomial regression. To assess the performance of the models, cross‐validation was used, obtaining the value of precision by R2, accuracy by root mean square error (RMSE), and trend by the mean error of the estimate (EME).RESULTSThe results showed that the RF algorithm achieves the highest precision and accuracy, with R2 of 0.81, RMSE of 176.93 kg ha−1 and trend (EME) of 1.99 kg ha−1. On the other hand, the SVM_RBF algorithm showed the lowest performance, with R2 of 0.74, RMSE of 213.58 kg ha−1 and EME of −15.06 kg ha−1. The average yield values predicted by the models were within the expected range for the region, which has a historical average value of 2.730 kg ha−1.CONCLUSIONAll models had acceptable precision, accuracy and trend indices, which makes it possible to use all algorithms to be applied in the prediction of soybean crop yield, observing the particularities of the region to be studied, in addition to being a useful tool for agricultural planning and decision making in soy‐producing regions such as the Brazilian Cerrado. © 2021 Society of Chemical Industry.
Radical surgery for de novo gallbladder carcinoma—Single‐center analysis of prognostic factors and survival outcomes from an endemic region
Authors: Gupta Sameer , Prakash Puneet , Kumar Vijay , Chaturvedi Arun , Misra Sanjeev , Akhtar Naseem , Rajan Shiv , Agarwal Preeti , Smith Lynette M. , Are Chandrakanth 
Published: December 2021

AbstractBackground and ObjectiveGallbladder cancer (GBC) is an aggressive malignancy where curative resection is possible in few and survival is poor. There are limited data on outcomes in patients with de novo GBC from endemic regions undergoing surgery for curative intent. We report survival outcomes in this group of patients from a region with high incidence of disease.MethodsWe reviewed the records of all GBC patients (2014–2018) and included those who underwent radical cholecystectomy (RC) for de novo GBC. Univariable and multivariable analyses were performed to identify factors influencing recurrence and survival.ResultsA total of 649 patients with GBC were evaluated for surgery and curative intent surgery was attempted in 246 (38%) patients. Of these 246 patients, RC was performed in 115 patients, with histologically confirmed de novo GBC. Locally advanced disease (≥stage IIIB) was present in 52 (45.2%) patients. Median time to recurrence and overall survival (OS) were 31 and 36 months, respectively. Lymph node positivity (p = 0.005) and grade significantly influenced OS on multivariable analysis.ConclusionSatisfactory survival outcomes are possible after RC for de novo GBC. Extended resections performed in high volume centers combined with appropriate adjuvant treatment can offer significant survival benefits, with acceptable morbidity and mortality rates.
A simple and effective method for identification of Fraxini Cortex from different sources by multi‐mode fingerprint combined with chemometrics
Authors: Long Huali , Yao Shuai , Tian Wenshuai , Hou Jinjun , Lei Min , Zhang Zijia , Guo Dean , Wu Wanying 
Published: December 2021

AbstractFraxini Cortex has a long history of being used as a medicinal plant in traditional Chinese medicine. However, it is challenging to differentiate and make quality evaluations for Fraxini Cortex from different origins due to their similarities in morphological features, as well as general chemical composition using traditional chemical analytical methods. In this study, a simple and effective method was developed to identify Fraxini Cortex from different origins by multi‐mode fingerprint combined with chemometrics. Digital images of the high‐performance thin‐layer chromatography profiles were converted to grayscale intensity, and the common patterns of high‐performance thin‐layer chromatography fingerprints were generated with ChemPattern software. Authentication and quality assessment were analyzed by similarity analysis, hierarchical cluster analysis, principal component analysis, and multivariate analysis of variance. The ultra‐high‐performance liquid chromatography fingerprints were analyzed by similarity analysis, principal component analysis, and orthogonal partial least square‐discriminant analysis. When combined with chemometrics, high‐performance thin‐layer chromatography and ultra‐high‐performance liquid chromatography fingerprint provided a simple and effective method to evaluate the comprehensive quality of Fraxini Cortex, and to distinguish its two original medicinal materials (Fraxinus chinensis Roxb. and Fraxinus rhynchophylla Hance.) recorded in the Chinese Pharmacopeia and its three adulterants (Fraxinus mandschurica Rupr., Fraxinus pennsylvanica Marsh., and Juglans mandshurica Maxim.). A similar workflow may be applied to establish a differentiation method for other medicinal and economic plants.
The role of organizational culture in health information technology implementations: A scoping review
Authors: Rajamani Sripriya , Hultman Gretchen , Bakker Caitlin , Melton Genevieve B. 
Published: December 2021

AbstractIntroductionThe exponential growth in health information technology (HIT) presents an immense opportunity for facilitating the data‐to‐knowledge‐to‐performance loop which supports learning health systems. This scoping review addresses the gap in knowledge around HIT implementation contextual factors such as organizational culture and provides a current state assessment.MethodsA search of 13 databases guided by Arskey and O'Malley's framework identified content on HIT implementations and organizational culture. The Consolidated Framework for Implementation Research (CFIR) was used to assess culture and to develop review criteria. Culture stress, culture effort, implementation climate, learning climate, readiness for implementation, leadership engagement, and available resources were the constructs examined. Rayyan and Qualtrics were used for screening and data extraction.ResultsFifty two studies included were mainly conducted in Academic Health Centers (n = 18, 35%) and at urban locations (n = 50, 96%). Interviews frequently used for data collection (n = 26, 50%) and guided by multiple frameworks (n = 34). Studies mostly focused on EHR implementations (n = 23, 44%) followed by clinical decision support (n = 9, 17%). About two‐thirds (n = 34, 65%) reflected culture stress theme and 62% (21 of 34) acknowledged it as a barrier. Culture effort identified in 27 studies and was a facilitator in most (78%, 21 of 27). Leadership engagement theme in majority studies (71%, n = 37), with 35% (n = 13) noting it as a facilitator. Eighty percent (42 studies) noted available resources, 12 of which identified this as barrier to successful implementation.ConclusionsIt is vital to determine the culture and other CFIR inner setting constructs that are significant to HIT implementation as facilitators or barriers. This scoping review presents a limited number of empirical studies in this topic highlighting the need for additional research to quantify the effects of culture. This will help build evidence and best practices that facilitate HIT implementations and hence serve as a platform to support robust learning health systems.
Corrosion protection properties of poly(4‐vinyl pyridine) containing multilayer polymeric coatings on magnesium alloy AZ31
Authors: Das Chayanika , Kastania Eleni , Witt Julia , Ozcan Ozlem 
Published: December 2021

AbstractThe aim of this study is to develop polymeric thin films for corrosion protection of magnesium alloy AZ31. As polymer matrix, poly(4‐vinyl pyridine) (P4VP) is selected due to its semiconducting properties and protonic conductivity. Polyacrylic acid is tested as crosslinking layers to improve interfacial adhesion. The macroscopic corrosion properties of the multilayer coatings are investigated by means of electrochemical methods, such as linear sweep voltammetry and electrochemical impedance spectroscopy (EIS), in corrosive media simulating technical and biomedical applications. It is demonstrated that thin multilayer coatings can suppress the corrosion rates of magnesium alloys. To our best knowledge, this is the first demonstration of the use of P4VP as a conducting polymer film with protonic conductivity for corrosion protection of magnesium alloys.
Magnetic Properties of a Polyfluorene Derivative Metallopolymer Containing Neodymium Ions
Authors: Santana Alisson J. , Turchetti Denis A. , Zanlorenzi Cristiano , dos Santos José C. R. , de Oliveira Adilson. J. A. , Akcelrud Leni 
Published: December 2021

AbstractThe magnetic properties of a polyfluorene derivative, {Poly[9,9’‐dihexylfluorene‐2,7‐yl)‐3,8‐(1,10‐phenanthroline)]} and its complexes with neodymium ions are explored and discussed in the light of the macromolecular configuration and photophysical properties. The pristine noncomplexed material is a diamagnetic material, and the introduction of Nd atoms in the polymer leads to a paramagnetic behavior over the entire temperature range. The prominent role of the morphology is demonstrated by comparison of two forms, with different ligands to the metal: one with bulky β‐diketone groups and another with small chorine as ligands. The large groups hinder interchain interaction, whereas the smaller salt forms favored interchain π‐stacking, providing a better interaction of the magnetic field with the polymer backbone, resulting in enhanced magnetic properties. The form with the β‐diketone groups exhibits a paramagnetic behavior whereas the one in the salt form presents ferromagnetic behavior at room temperature. This contribution brings solid confirmation to the importance of interchain interaction in the magnetic properties of conjugated polymers, opening a new way to the obtainment of magnetic conjugated polymers.
Technical note: Advancing size‐specific dose estimates in CT examinations: Dose estimates at longitudinal positions of scans
Authors: Li Xinhua , Marschall Theodore A. , Yang Kai , Liu Bob 
Published: December 2021

PurposeAmerican Association of Physicists in Medicine (AAPM) (Report 204) introduced the size‐specific dose estimate (SSDE) for the average dose to the center of a fixed‐mA scan. International standards establish a method that CT manufacturers and radiation dose index monitoring software may use to calculate SSDE(z) at longitudinal positions of scans with fixed mA or tube current modulation, and its scan range average . We sought to test how accurate SSDE(z) is in tracking the average dose to the transverse slab of an axial image slice (Dslice), evaluated with Monte Carlo calculation, in the chest and abdominopelvic examinations.MethodsWe retrospectively identified 65 consecutive adult patients undergoing whole‐body CT for transcatheter aortic valve implantation planning. Examination parameters (kV, mA, CTDIvol) were extracted from the DICOM headers. Patient water equivalent diameter DW(z) was calculated at each image slice, excluding the patient table. A previously validated Monte Carlo simulation (Geant4) program was used to evaluate Dslice from the chest and abdominopelvic examinations. Alternatively, SSDE(z) was calculated at each slice. The results of the two methods were compared with descriptive statistical outcomes (R, version 4.0.2).ResultsIn chest and abdominopelvic CT examinations, Dslice largely changed with anatomic location and uniformly fell off toward scan range edges. Scan range averages and were consistent within 2.5%–3.1% (median) and 6.3%–10.4% (maximum) in two examinations. On individual image slices, SSDE(z) could be lower or higher than Dslice, with deviation ranging from −18.3% to 85% in two edges (2 × 5 cm) of scan range and from −35.2% to 18.7% in the remaining central region of the scan.ConclusionThis study provides critical inputs for quality assurance programs. is useful to track the average dose of all image slices, but further development may be useful for tracking patient dose at the level of individual image slices, especially near a scan range edge.
Commissioning of carbon‐ion radiotherapy for moving targets at the Osaka Heavy‐Ion Therapy Center
Authors: Hamatani Noriaki , Tsubouchi Toshiro , Takashina Masaaki , Yagi Masashi , Kanai Tatsuaki 
Published: December 2021

AbstractPurposeHerein, we report the methods and results of the Hitachi carbon‐ion therapy facility commissioning to determine the optimum values of the magnitude of movement and repaint number in respiratory‐gated irradiation.MethodsA virtual‐cylinder target was created using the treatment‐planning system (VQA Plan), and measurements were performed to study the effects of respiratory movements using a two‐dimensional ionization‐chamber array detector and a phantom with movable wedge and stage. For simulations, we selected a 10 × 10 × 10 cm3 cubic irradiation pattern with a uniform physical dose and two actual cases of liver‐cancer treatments, whose prescribed doses were 60 Gy(RBE)/4 fraction (Case 1) and 60 Gy(RBE)/12 fraction (Case 2). We employed two types of repainting methods, one produced by the algorithm of VQA Plan (VQA algorithm) and the other by ideal repainting. The latter completely repeats all spots with set number of repaintings. We performed flatness calculations and gamma analysis to evaluate the effects of each condition.ResultsFrom the measurements, the gamma passing rates for which the criteria were 3%/3 mm exceeded 95% for displacements in the head‐to‐tail direction if the repaint number was greater than 3 and the magnitude of the residual motions was less than 5.0 mm. In simulations with the cubic irradiation pattern, the gamma passing rates (with criteria of 2%/2 mm) exceeded 95% when the magnitude of the residual motions was 3.0 mm and the repaint number was greater than 3. When the repaint number was set to 4 in the VQA with the actual liver cases, the flatness results for Case 2 was minimal. For ideal repainting, the flatness results for all ports fell within ∼3.0% even when the magnitude of the residual motions was 5.0 mm if the repaint number was 6. However, the flatness was less than 3.0% for almost all ports if the magnitude of the residual motions was less than 3.0 mm with a repaint number of 4 in case of both types of repaint methods.ConclusionsAt our facility, carbon‐ion radiotherapy can be provided safely to a moving target with residual motions of 3.0 mm magnitude and with a repaint number of 4.
An improved neuro‐adaptive‐optimal control for oscillation damping in wind‐integrated power systems
Authors: Jamsheed Faisal , Iqbal Sheikh Javed 
Published: December 2021

AbstractThis article proposes an improved neuro‐adaptive‐optimal control scheme, based on online system identification and simultaneous control, to replace power system stabilizer in the renewable‐energy‐penetrated power systems. A simple, linear neural identifier, with a few adjustable connection weights is used, which ensures minimal computational burden, reduced development time, and makes the controller practically realizable. An adaptive learning rate, derived using Lyapunov stability theorems, guarantees stability of convergence of the learning algorithm as well as an optimal speed of convergence. It is demonstrated that a simple linear neural identifier, which approximates a local linear model of a system, by adjustment of its parameters online, is faithfully able to track the varying dynamics of the system. Improved oscillation‐damping performance over a wide range of operating conditions and disturbances, in comparison with a well‐established IEEE‐PSS1A and fuzzy‐logic‐control‐based PSS, was validated through simulation studies on a single‐machine infinite‐bus power system and a wind‐integrated two‐area power system. The computational superiority of the proposed scheme in comparison to complex and non‐linear neural networks and fuzzy‐logic‐based control was also established. The novelty of the controller lies in its structure which, in‐spite of being purely linear, performs robustly for highly complex and non‐linear power system models.
Structural relaxation of an epoxy resin at temperatures well below Tg*
Authors: Song Hosup , Medvedev Grigori A. , Caruthers James M. 
Published: December 2021

AbstractThe effects of annealing a glassy polymer at temperatures well below Tg on the dynamic linear viscoelastic properties were investigated. The polymer was an epoxy thermoset with a Tg of 182°C. Specimens were annealed from 2 h to up to 600 h at temperatures from −100°C (Tg −282°C) up to Tg. At annealing temperatures just below Tg, there was no effect of annealing, and annealing at −100°C (Tg −282°C) showed no difference between 2 and 6 h annealing, although annealing effects might be seen at longer times. At temperatures between −50°C (Tg −232°C) and 170°C (Tg −12°C) the storage isotherms increased with annealing while the loss isotherms decreased. In addition, the heat capacity as measured via DSC after annealing at 50°C (Tg −132°C) and 100°C (Tg −82°C) exhibited endothermic peaks approximately 40°C above the annealing temperature. This study clearly shows that a material deep in the glassy state is not frozen, but undergoes continuing evolution. The nature of deep glass aging is different than physical aging in the Tg region, where deep in the glass the relaxation spectrum changes magnitude and shape but does not shift along the log frequency axis in contrast to physical aging in the Tg region.
Distress in hospitalized cancer patients: Associations with personality traits, clinical and psychosocial characteristics
Authors: Pichler Theresia , Marten‐Mittag Birgitt , Hermelink Kerstin , Telzerow Eva , Frank Tamara , Ackermann Ulrike , Belka Claus , Combs Stephanie E. , Gratzke Christian , Gschwend Jürgen , Harbeck Nadia , Heinemann Volker , Herkommer Kathleen , Kiechle Marion , Mahner Sven , Pigorsch Steffi , Rauch Josefine , Stief Christian , Mumm Friederike , Heußner Pia , Herschbach Peter , Dinkel Andreas 
Published: December 2021

AbstractObjectiveTo improve allocation of psychosocial care and to provide patient‐oriented support offers, identification of determinants of elevated distress is needed. So far, there is a lack of evidence investigating the interplay between individual disposition and current clinical and psychosocial determinants of distress in the inpatient setting.MethodsIn this cross‐sectional study, we investigated 879 inpatients with different cancer sites treated in a German Comprehensive Cancer Center. Assessment of determinants of elevated distress included sociodemographic, clinical and psychosocial characteristics as well as dimensions of personality. Multiple linear regression was applied to identify determinants of psychosocial distress.ResultsMean age of the patients was M = 61.9 (SD = 11.8), 48.1% were women. In the multiple linear regression model younger age (β = −0.061, p = 0.033), higher neuroticism (β = 0.178, p = <0.001), having metastases (β = 0.091, p = 0.002), being in a worse physical condition (β = 0.380, p = <0.001), depressive symptoms (β = 0.270, p = <0.001), not feeling well informed about psychological support (β = 0.054, p = 0.046) and previous uptake of psychological treatment (β = 0.067, p = 0.020) showed significant associations with higher psychosocial distress. The adjusted R2 of the overall model was 0.464.ConclusionControlling for sociodemographic characteristics and dispositional vulnerability, that is neuroticism, current clinical and psychosocial characteristics were still associated with hospitalized patients' psychosocial distress. Psycho‐oncologists should address both, the more transient emotional responses, such as depressive symptoms, as well as more enduring patient characteristics, like neuroticism.
Outdoor pollen concentration is not associated with exercise‐induced bronchoconstriction in children
Authors: Tikkakoski Anna P. , Karjalainen Jussi , Sipilä Kalle , Kivistö Juho E. , Kähönen Mika , Lehtimäki Lauri , Tikkakoski Antti 
Published: December 2021

AbstractBackgroundFree running exercise test outdoors is an important method to diagnose asthma in children. However, the extent of how much exposure to pollens of outdoor air affects the results of the test is not known.MethodsWe analyzed all reliable exercise challenge tests with impulse oscillometry in children (n = 799) between January 2012 and December 2014 in Tampere University Hospital. Pollen concentrations at the time of the test were collected from the register of Biodiversity Unit of the University of Turku. We compared the frequency of exercise‐induced bronchoconstriction and pollen concentrations.ResultsThe analyses were restricted to birch and alder pollen as high counts of grass and mugwort pollen were so infrequent. The relative change in resistance at 5 Hz after exercise or the frequency of exercise‐induced bronchoconstriction were not related to alder or birch pollen concentrations over 10 grains/m3 (p = 0.125–0.398). In logistic regression analysis comparing the effects of alder or birch pollen concentrations, immunoglobulin E (IgE)‐mediated alder or birch allergy and absolute humidity over 10 g/m3 only absolute humidity was independently associated with change in airway resistance (odds ratio [OR]: 0.32, confidence interval [CI]: 0.13–0.67, p: 0.006).ConclusionsIn our large clinical sample, outdoor air pollen concentration was not associated with the probability of exercise‐induced bronchoconstriction in free running test in children while low absolute humidity was the best predictor of airway obstruction.
Excitable Madden–Julian Oscillation like behaviour of a simple model of equatorial moist dynamics results from a time step that is too large
Authors: Davison Matthew , Haynes Peter 
Published: December 2021

AbstractA recent article by Vallis and Penn (2020) in this journal presented the behaviour of a simple single‐layer model of moist dynamics, identifying an “excitable” behaviour in which a feedback between condensational heating and gravity waves sustained high values of kinetic energy and, when the model was an equatorial ‐plane configuration, a sustained Madden–Julian Oscillation (MJO)‐like disturbance, eastward‐propagating and including a localised region of condensational heating. Evidence is presented here that both the excitable and MJO‐like behaviours are artificial, in the sense that they result from a choice of time step that it is too large to allow a satisfactory solution of the partial differential equations defining the model.