bluuebunny/crossref_metadata_2025_split huggingface dataset:
A vital sign-based prediction algorithm for differentiating COVID-19 versus seasonal influenza in hospitalized patients
Authors: Yanamala Naveena , Krishna Nanda H. , Hathaway Quincy A. , Radhakrishnan Aditya , Sunkara Srinidhi , Patel Heenaben , Farjo Peter , Patel Brijesh , Sengupta Partho P. 
Published: June 2021

AbstractPatients with influenza and SARS-CoV2/Coronavirus disease 2019 (COVID-19) infections have a different clinical course and outcomes. We developed and validated a supervised machine learning pipeline to distinguish the two viral infections using the available vital signs and demographic dataset from the first hospital/emergency room encounters of 3883 patients who had confirmed diagnoses of influenza A/B, COVID-19 or negative laboratory test results. The models were able to achieve an area under the receiver operating characteristic curve (ROC AUC) of at least 97% using our multiclass classifier. The predictive models were externally validated on 15,697 encounters in 3125 patients available on TrinetX database that contains patient-level data from different healthcare organizations. The influenza vs COVID-19-positive model had an AUC of 98.8%, and 92.8% on the internal and external test sets, respectively. Our study illustrates the potentials of machine-learning models for accurately distinguishing the two viral infections. The code is made available at https://github.com/ynaveena/COVID-19-vs-Influenza and may have utility as a frontline diagnostic tool to aid healthcare workers in triaging patients once the two viral infections start cocirculating in the communities.
First principles study of dense and metallic nitric sulfur hydrides
Authors: Li Xiaofeng , Lowe Angus , Conway Lewis , Miao Maosheng , Hermann Andreas 
Published: June 2021

AbstractStudies of molecular mixtures containing hydrogen sulfide (H2S) could open up new routes towards hydrogen-rich high-temperature superconductors under pressure. H2S and ammonia (NH3) form hydrogen-bonded molecular mixtures at ambient conditions, but their phase behavior and propensity towards mixing under pressure is not well understood. Here, we show stable phases in the H2S–NH3system under extreme pressure conditions to 4 Mbar from first-principles crystal structure prediction methods. We identify four stable compositions, two of which, (H2S) (NH3) and (H2S) (NH3)4, are stable in a sequence of structures to the Mbar regime. A re-entrant stabilization of (H2S) (NH3)4above 300 GPa is driven by a marked reversal of sulfur-hydrogen chemistry. Several stable phases exhibit metallic character. Electron–phonon coupling calculations predict superconducting temperatures up to 50 K, in theCmmaphase of (H2S) (NH3) at 150 GPa. The present findings shed light on how sulfur hydride bonding and superconductivity are affected in molecular mixtures. They also suggest a reservoir for hydrogen sulfide in the upper mantle regions of icy planets in a potentially metallic mixture, which could have implications for their magnetic field formation.
Optimal time allocation for throughput maximization in backscatter assisted wireless powered communication networks
Authors: Sun Juan , Zhang Shubin , Chi Kaikai 
Published: June 2021

AbstractIntegrating backscatter communication (BackCom) into wireless powered communication networks (WPCNs) makes it possible to transmit information and harvest energy simultaneously, which is regarded as a promising method to enhance the throughput. A very important issue is how to allocate the charging time and transmitting time to efficiently utilize the energy in hybrid access point (HAP) so as to improve the network performance. This paper adopts convex optimization to handle the time allocation for both WPCNs and BackCom users. A two‐stage efficient algorithm is proposed to solve the problem of sum‐throughput maximization (STM) subject to the basic throughput requirements of BackCom users, where the Lagrange duality method is applied at the first‐stage, while golden section and bisection method are jointly used at the second‐stage. In order to solve the throughput unfairness among nodes in the STM problem, the common‐throughput maximization (CTM; i.e. the worst node's throughput) problem is further considered. This problem is decomposed into a master problem and a sub‐problem, which are solved in a progressive manner. Simulation results show that the proposed methods obtain substantial improvement compared to the benchmark scheme.
Array antenna equipped UAV‐BS for efficient low power WSN and its theoretical analysis
Authors: Lumbantoruan Hendrik , Adachi Koichi 
Published: June 2021

AbstractIn a wireless sensor network consisting of a large number of sensor nodes (SNs), an efficient communication scheme is crucial to boost data collection efficiency. Furthermore, SN is required to communicate by the low transmission power to prolong its battery life. However, SNs located at the edge of the communication area may fall into the outage as the signal‐to‐noise power ratio fails to surpass a certain threshold. Moreover, signal collision due to the interferers may deteriorate the packet delivery rate. An unmanned aerial vehicle‐base station (UAV‐BS) is an attractive solution to lower outage probability and enhance communication efficiency. Here, outage probability and capturing failure probability performance of a rotational angle division multiple access (RADMA), which is realized by UAV‐BS with an array antenna, are analytically evaluated. The numerical performance evaluation is conducted to elucidate the performance improvement of RADMA under low power wide‐area network setup. Numerical simulation results show that RADMA can suppress the packet loss ratio 77%, shorten the transmission time 25%, and reduce the required transmission energy 20%.
Total transfer capability assessment of HVDC tie‐lines in asynchronous grids
Authors: Deng Buqing , Wen Yunfeng , Jiang Xiaoliang 
Published: June 2021

AbstractThis paper discusses how frequency‐stable operational decision‐making of asynchronous grids with intensive high‐capacity HVDC tie‐lines, can be achieved leveraging a novel total transfer capability (TTC) evaluation approach. This problem is formulated as a hierarchical optimization model with multiple decision‐makers, in which the master problem is solved by the coordinator to determine the base case maximum acceptable transmission power of each HVDC tie‐line, while the sending‐ and receiving‐end grid's local TSO each autonomously solves a frequency constrained optimal power flow sub‐problem. Coordinated fast and slow frequency arrest strategies are fully integrated into the TTC assessment framework, which not only ensure that last‐resort protections are not triggered following the HVDC bi‐pole block contingency, but also take advantage of the potential control capability of the sending‐ and receiving‐end grids and would therefore increase the TTC of HVDC tie‐lines. A decentralized algorithm based on accelerated analytical target cascading is developed to solve the formulated model. Case studies on a modified two‐area RTS‐96 system and a practical large‐scale system demonstrate the effectiveness of the proposed approach.
Implementation of uniaxial perfectly matched layer based on hexahedron element in discontinuous Galerkin time domain
Authors: Xiao Zhennan , Wei Bing , Ge Debiao 
Published: June 2021

AbstractThe uniaxial perfectly matched layer (UPML), an important link in the numerical calculation of the discontinuous Galerkin time domain (DGTD), truncates the size of the computational domain and absorbs the outward‐travelling waves. In traditional DGTD, tetrahedral meshes are used to divide the computational domain. These meshes are also used in UPML. As the scope of the computational domain is wide, many meshes will be generated after the UPML division wraps the external part of the domain, thereby resulting in inefficient computation. The use of a UPML in DGTD form based on hexahedral meshes is proposed. The internal propagation and UPML regions are divided by a tetrahedral element and a hexahedral element, respectively. Among the relevant numerical examples given, a few cases are analysed to demonstrate the feasibility of the proposed method: the high efficiency of the UPML with hexahedral mesh, attenuation of electromagnetic waves inside the UPML, and relative error of the electric field values at the observation points.
Co(II) coordination polymer: Treatment activity on vulvovaginal candidiasis by inhibiting the growth of the Candida albicans
Authors: Sun Huaqin , Li Yanxia , Ding Zhaoxia , Xu Shucui , Cui Qiulian 
Published: June 2021

AbstractBy the reaction between Co(NO3)2·6H2O and 4‐(bis(4‐(pyridin‐4‐yl)phenyl)amino)benzoic acid (Hbpba), a triphenylamine‐functionalized ligand in CH3CN and N,N‐dimethylformamide (DMF) mixed solvent under the solvothermal conditions, a new coordination polymer (CP) containing Co(II) has been successfully prepared, and its chemical formula is [Co(bpba)(NO3)] (1). The colony‐forming unit (CFU) numbers of the Candida albicans after the compound treatment was measured with diluted micro‐plates assay. In addition to this, the inflammatory cytokines released into the vaginal discharge was determined with enzyme linked immunosorbent assay (ELISA) detection kit. Both pyridine and carboxyl groups have the capabilities to provide polar atoms for interacting with the active sites on target protein, however, results from molecular docking showed that only carboxyl group exhibited activity.
Research on the application of nanometre fiso interferometer for phase and phase element detection signal processing
Authors: Feng Fei , Qin Li , Li Xiuyuan , Li Yingxue 
Published: June 2021

AbstractThe use of nanometre fiso interferometer to measure heterodyne interference signals at the same time for phase and phase element detection and phase‐locked frequency multiplication counting is employed here. After a certain logic mixing, a set of measurement results with a certain degree of redundancy can be obtained; the test results can be measured and resolved. The rate is better than 0.1 nm, and the measurement range is not limited by the λ/2 period, thus overcoming the previous problems that is the measurement range of the phase measurement method is limited to one period and the resolution of the phase‐locked frequency multiplication counting method is not easy to improve.
Application of an adaptive Bayesian‐based model for probabilistic and deterministic PV forecasting
Authors: Abedinia Oveis , Bagheri Mehdi , Agelidis Vassilios G. 
Published: June 2021

AbstractAccurate prediction of solar photovoltaic plant energy generation is essential for optimal planning and operation of modern power systems, and incorporating such plants into the energy sector. In this study, an adaptive Gaussian mixture method (AGM) and a developed variational Bayesian model (VBM) inference through multikernel regression (MkR) are utilized to assist desirable precise prediction. In this model, the MkR processes the multiresolution solar energy signal, and then the AGM models the complex signals forecasting error. Finally, the proposed model can be optimized, and the concurrent output of the solar energy signal in both probabilistic and deterministic status can be attained through the introduction of the VBM. The solar energy output of an actual plant, including four measurement sites provided the data for the study. The results confirmed that the proposed model delivers higher prediction accuracy for both probabilistic and deterministic forecasts when compared with other well‐known models.
Substantiation of development system parameters taking into account the main dimensions of working equipment used in the development of mineral deposits by open-pit method
Authors: Tyukov P.O. , Loginov E.V. 
Published: June 2021

The text substantiates the dependence of the complex dimen-sions of and transportation equipment (excavator - dump truck links) on the parameters of the mining method, which ensures an increase in the effi-ciency of open-pit mining of mineral deposits, is justified in the text. In-creasing the efficiency of open-pit mining method using a complex of ex-traction and loading and transportation equipment is achieved by increasing the range of permissible parameters of the mining method. The study allowed to identify

the dimensions of the extraction and loading and transportation equipment complex (excavator - dump truck links) affect the height of the bench and the width of the working platform
the dimensions of the mining and loading equipment (excavator - dump truck links) are the main indicators that affect the parameters of the mining method at the complex of mining and loading and transportation equipment.
Study on the impact of coastal land use change on environment based on remote sensing data
Authors: Yong Liu , Chen Yunlin 
Published: June 2021

The coastal zone is the bridge between the ocean and the mainland, the junction of the two ecosystems, the focus of the economic development of coastal cities and the gathering place of ports. Remote sensing technology uses the detector to receive the electromagnetic wave from the target object. After processing the information, it can distinguish the attributes of the target object. It is widely used in marine development, aerospace understanding, resource exploration and other fields.In this paper, the coastal zone of Shangyu Economic Development Zone on the south coast of Hangzhou Bay is taken as the research area. Using multi-source remote sensing data, information extraction, change monitoring and analysis are carried out from the perspective of marine and land ecosystems, and the impact of coastal development on the coastal zone is discussed. The main conclusions are as follows:
(a)	Using visual interpretation method, it is found that the coastline of the study area changes obviously, and the decrease trend is below the total coastline length; Fractal dimension index is used to characterize the natural condition of coastline. The total coastline length, natural coastline and artificial coastline all increase, which means that the amount of beach sediment deposition and the degree of artificial intervention have increased in this stage.
(b)	The object-oriented method is used to extract the land use classification of the coastal zone in the study area. Cultivated land is the main land type in the study area, and the impervious surface is the fastest growing. The degree of artificial development of the whole study area is gradually increasing, and the coastal beach area is greatly reduced, and the impervious surface area is greatly increased. Wetland and impervious surface are the two most dramatic changes in the study period. Wetland is mainly transformed into other surface features, while impervious surface is mainly transformed into other surface features.
The Theoretical Total Synthesis of an Aromatic Esters of the Crinane Amaryllidaceae Alkaloid Ambelline
Authors: Liu Danyang , Zhou Zhijian , Liu Hao 
Published: June 2021

ABSTRACT.
A series of crinane-type alkaloid ambelline derivatives were assessed for their potency to inhibit both acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE), which has been shown to be effective medicine for the treatment of Alzheimer’s disease. However, no enzyme modification has been reported total synthesis. In this work, two possible theoretical synthesis paths of Crinane-type alkaloid ambelline were discussed in this article. The major difficulty of the proposed synthesis was the synthesis of the quaternary carbon. One of the approaches emphasized on the reactions between cyclic and heterocyclic compounds and substrates on the intermediates to generate the quaternary carbon shown on the desired product. The other approach utilized series of amine reactions and Michael addition to create the precursor for the reactant in the Diels-Alder reaction and, therefore, the quaternary carbon, and finally, the desired natural product was obtained after a weak acid workup. The synthesis of ambelline has the potential to provide new pathways for treatment of Alzheimer’s disease.
Neues Update zu den idiopathischen interstitiellen Pneumonien
Authors: Vogel Monika , Heußel Claus Peter 
Published: June 2021

ZusammenfassungSeit dem letzten Update zu den idiopathischen interstitiellen Pneumonien (IIPs) 2014 1 hat sich wieder einiges geändert. So wurden z. B. die Diagnosekriterien für die häufigste IIP, die idiopathische Lungenfibrose (IPF), aktualisiert. Zudem etabliert sich zunehmend die Einordnung der mit Rauchen assoziierten interstitiellen Pneumonien in eine eigene Gruppe. Dieser Artikel stellt den neuesten Stand dar und bietet begriffliche Klarheit.
Impact of the Covid-19 Pandemic on Colorectal Cancer Surgery in Madrid
Authors: Labalde Martínez Maria , García Borda Francisco Javier , Narvaez Chavez Cristina , Vivas Lopez Alfredo , García Villar Oscar , Gomez Ramón , Ramos Martinez Rafael , de La Cruz Vigo Felipe , Ferrero Herrero Eduardo 
Published: June 2021

Abstract
Introduction The Covid-19 pandemic has had an important impact on colorectal cancer surgery, for hospital resources had to be redistributed in favour of Covid-19 patients. The aim of the present study is to analyze our results in colorectal oncologic surgery during the Covid-19 pandemic in patients with and without perioperative SARS-CoV-2 infection.
Methods In total, 32 patients (19 male and 13 female patients), with a mean age of 64 years (range: 57.2 to 69.5 years) with colorectal cancer underwent surgery under the recommendations of surgical societies included in a protocol. Data collection included clinical characteristics (gender, age, body mass index, American Society of Anesthesiologists score, tumor location, preoperative staging, lymphopenia), data related to SARS-CoV-2 infection (postoperative symptoms, diagnostic tests), operative details (surgical procedure, approach, duration, stoma), pathological outcomes (tumor stage, number of lymph nodes harvested, distal and circumferential radial margins, quality of the total mesorectal excision), and surgical outcomes (morbidity, mortality, hospital stay, and the rates of reoperation and readmission).
Results A total of 3 (9.4%) patients who underwent colorectal surgery during the Covid-19 pandemic were infected by SARS-CoV-2 in the postoperative period. Chronic obstructive pulmonary disease was associated with Covid-19 (6.2% versus 33.3%; p = 0.042), and surgical morbidity was higher among Covid-19 patients (100% versus 37.9%; p = 0.039). There were not significant differences between COVID-19 patients and non-COVID-19 patients in relation to the rest of the analyzed outcomes.
Conclusion During the Covid-19 pandemic, colorectal cancer surgery should be performed according to the recommendations of surgical societies. However, Covid-19 patients could present a higher morbidity rate.
Prevention of Paradoxical Cerebral Embolus with Protection System during Combination Right Atrial Clot Aspiration Thrombectomy and Closure of Patent Foramen Ovale
Authors: Chiang Jason , Mathevosian Sipan , Aboulhosn Jamil , Moriarty John M 
Published: June 2021

AbstractIn this technical case report, we describe a 41-year-old female with a history of breast cancer who was found to have a right atrial clot attached to the tip of her Port-A-Cath. During transthoracic echocardiography to evaluate her clot, she was also noted to also have a patent foramen ovale. The decision was made to perform a simultaneous right atrial endovascular aspiration thrombectomy and patent foramen ovale closure. To minimize the risk for paradoxical embolus during clot manipulation, an intravascular embolic neuroprotection device was deployed. After the procedure, it was noted on visual inspection that the device filter contained several embolic fragments. The presence of macroscopic embolic fragments in the filter baskets highlights the role of prophylactic embolic protection when performing cardiac interventions in the setting of a patent foramen ovale, particularly in the presence of a right atrial thrombus or mass.
Endoluminal Cooling of the Esophagus during Percutaneous Thermal Ablation for Juxtaesophageal Liver Neoplasm: Two Cases
Authors: Itou Chihiro , Arai Yasuaki , Sone Miyuki , Sugawara Shunsuke 
Published: June 2021

AbstractThermal injury to the surrounding hollow organs should be avoided during thermal ablation therapy. Although this type of injury is rare, severe complications, such as perforation or stricture, have been reported. Despite the development of various adjunctive thermoprotection techniques, there are a few reports of their use for protecting the esophagus during liver ablation therapy. Endoluminal irrigation is a well-known technique for protecting hollow organs, such as the biliary tract, renal pelvis, ureter, and rectum; however, it is used infrequently for avoiding thermal injury to the esophagus. There may be hesitation in treating juxtaesophageal liver tumors with conventional ultrasound-guided ablation because the location restricts the ultrasonic window due to the poor visibility. We successfully treated two consecutive cases of juxtaesophageal liver tumor with computed tomography-guided ablation by applying endoluminal irrigation and cooling via a 12-French nasal feeding tube placed in the lower esophagus.
Recurrent Hemorrhoids—Efficacy, Utility and Initial Experience with the Use of Stapled Hemorrhoidopexy in Recurrent Hemorrhoids
Authors: Wani Ajaz Ahmed , Khuroo Suhail , Heer Vikas Kumar , Jain Saurabh Kumar , Rajput Deepak , Maqsood Shadab , Malik Altaf 
Published: June 2021

Abstract
Overview Hemorrhoidal disease (HD) is a common surgical disorder. The treatment modalities can be surgical or nonsurgical. Every surgical option has its own indications and limitations. Postsurgical symptomatic recurrence rates are low and vary between different techniques. The ideal way to deal with recurrent HD is not clear.
Material and Methods The present prospective case series enrolled a total of 87 patients (54 male/33 female). Thirteen out of 87 patients (15%) had history of previous intervention for HD. A modification of the standard technique was adopted for patients with recurrent HD. A mean follow-up of 22 months was achieved.
Results Stapled hemorrhoidectomy (SD) was performed in 13 patients who had history of previous surgical intervention for HD. There were no adverse events related to the technique. Patients with recurrent HD had severe pain scores with SH as compared to patients who underwent SH at the first time. There were no wound related complications.
Conclusion Stapled hemorrhoidectomy can be performed easily and offers good results in patients with recurrent HD.