bluuebunny/crossref_metadata_2025_split huggingface dataset:
Air and temperature sensitivity of n-type polymer materials to meet and exceed the standard of N2200
Authors: Brixi Samantha , Melville Owen A. , Mirka Brendan , He Yinghui , Hendsbee Arthur D. , Meng Han , Li Yuning , Lessard Benoît H. 
Published: March 2020

AbstractN-type organic semiconductors are notoriously unstable in air, requiring the design of new materials that focuses on lowering their LUMO energy levels and enhancing their air stability in organic electronic devices such as organic thin-film transistors (OTFTs). Since the discovery of the notably air stable and high electron mobility polymer poly{[N,N′-bis (2-octyldodecyl)- naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,29-bisthiophene)} (N2200), it has become a popular n-type semiconductor, with numerous materials being designed to mimic its structure. Although N2200 itself is well-studied, many of these comparable materials have not been sufficiently characterized to compare their air stability to N2200. To further the development of air stable and high mobility n-type organic semiconductors, N2200 was studied in organic thin film transistors alongside three N2200-based analogues as well as a recently developed polymer based on a (3E,7E)-3,7-bis(2-oxoindolin-3-ylidene)benzo[1,2-b:4,5-b′]difuran-2,6(3 H,7 H)-dione (IBDF) core. This IBDF polymer has demonstrated promising field-effect mobility and air stability in drop-cast OTFTs. While N2200 outperformed its analogues, the IBDF-based polymer displayed superior air and temperature stability compared to N2200. Overall, polymers with more heteroatoms displayed greater air stability. These findings will support the development of new air-stable materials, and further demonstrate the persistent need for the development of novel n-type semiconductors.
Acute effects of ambient PM2.5 on lung function among schoolchildren
Authors: Xu Dandan , Chen Yuan , Wu Lizhi , He Shengliang , Xu Peiwei , Zhang Yongli , Luo Jinbin , Ye Xialiang , Chen Zhijian , Wang Xiaofeng , Lou Xiaoming 
Published: March 2020

AbstractPrevious studies have found that fine particulate matter (PM2.5) air pollution is associated with decreased lung function. However, most current research focuses on children with asthma, leading to small sample sizes and limited generalization of results. The current study aimed to measure the short-term and lag effects of PM2.5 among school-aged children using repeated measurements of lung function.This prospective panel study included 848 schoolchildren in Zhejiang Province, China. Each year from 2014–2017, two lung function tests were conducted from November 15th to December 31st. Daily air pollution data were derived from the monitoring stations nearest to the schools. A mixed-effects regression model was used to investigate the relationship between PM2.5 and lung function. The effect of PM2.5 on lung function reached its greatest at 1-day moving average PM2.5 exposure. For every 10 μg/m3 increase in the 1-day moving average PM2.5 concentration, Forced Vital Capacity (FVC) of children decreased by 33.74 mL (95% CI: 22.52, 44.96), 1-s Forced Expiratory Volume (FEV1) decreased by 32.56 mL (95% CI: 21.41, 43.70), and Peak Expiratory Flow (PEF) decreased by 67.45 mL/s (95% CI: 45.64, 89.25). Stronger associations were found in children living in homes with smokers. Short-term exposure to PM2.5 was associated with reductions in schoolchildren’s lung function. This finding indicates that short-term exposure to PM2.5 is harmful to children’s respiratory health, and appropriate protective measures should be taken to reduce the adverse effects of air pollution on children’s health.
Energy and helicity fluxes in line-tied eruptive simulations
Authors: Linan L. , Pariat É. , Aulanier G. , Moraitis K. , Valori G. 
Published: March 2020

Context.Conservation properties of magnetic helicity and energy in the quasi-ideal and low-βsolar corona make these two quantities relevant for the study of solar active regions and eruptions.Aims.Based on a decomposition of the magnetic field into potential and nonpotential components, magnetic energy and relative helicity can both also be decomposed into two quantities: potential and free energies, and volume-threading and current-carrying helicities. In this study, we perform a coupled analysis of their behaviors in a set of parametric 3D magnetohydrodynamic (MHD) simulations of solar-like eruptions.Methods.We present the general formulations for the time-varying components of energy and helicity in resistive MHD. We calculated them numerically with a specific gauge, and compared their behaviors in the numerical simulations, which differ from one another by their imposed boundary-driving motions. Thus, we investigated the impact of different active regions surface flows on the development of the energy and helicity-related quantities.Results.Despite general similarities in their overall behaviors, helicities and energies display different evolutions that cannot be explained in a unique framework. While the energy fluxes are similar in all simulations, the physical mechanisms that govern the evolution of the helicities are markedly distinct from one simulation to another: the evolution of volume-threading helicity can be governed by boundary fluxes or helicity transfer, depending on the simulation.Conclusions.The eruption takes place for the same value of the ratio of the current-carrying helicity to the total helicity in all simulations. However, our study highlights that this threshold can be reached in different ways, with different helicity-related processes dominating for different photospheric flows. This means that the details of the pre-eruptive dynamics do not influence the eruption-onset helicity-related threshold. Nevertheless, the helicity-flux dynamics may be more or less efficient in changing the time required to reach the onset of the eruption.
DSM-TACE of HCC: Evaluation of Tumor Response in Patients Ineligible for Other Systemic or Loco-Regional Therapies
Authors: Haubold Johannes , Reinboldt Markus P. , Wetter Axel , Li Yan , Ludwig Johannes Maximilian , Lange Christian , Wedemeyer Heiner , Schotten Clemens , Umutlu Lale , Theysohn Jens 
Published: March 2020

Purpose To analyze tumor response, survival and safety in patients with non-resectable hepatocellular carcinoma (HCC) treated with transarterial hepatic chemoembolization using degradable starch microspheres (DSM-TACE) combined with doxorubicin who had no local interventional or systemic therapy alternative according to an interdisciplinary conference.
Materials and Methods In this retrospective study, 28 patients (23 male, 5 female, median age 67 years) with unresectable HCC, serum bilirubin levels < 3 mg/dl and contraindications to Sorafenib, RFA, SIRT or cTACE were included. DSM-TACE was performed using Embocept® S (15 ml) and doxorubicin (50 mg/25 ml) three times every 4–6 weeks. Patients were initially staged using the Barcelona Clinic Liver Cancer System (BCLC). Basic liver function was evaluated with the MELD-score. Tumor response was assessed using the modified Response Evaluation Criteria in Solid Tumors (mRECIST).
Results DSM-TACE could be technically successfully performed in all 28 patients. At control imaging after three treatments, the overall rates of complete response (CR), partial response (PR), stable disease (SD), and progressive disease (PD) were 14.3 %, 25 %, 39.3 % and 21.4 %, respectively, according to mRECIST. With regard to BCLC stages, the results were as follows (CR, PR, PD): BCLC A (n = 8): 7.1 %, 7.1 %, 10.7 %, 1.2 %; BCLC B (n = 12): 0 %, 10.7 %, 17.9 %, 14.3 %; BCLC C (n = 5): 0 %, 3.6 %, 10.7 %, 3.6 %; BCLC D (n = 3): 3.6 %, 3.6 %, 0 %, 3.6 %. According to this, DSM-TACE showed an overall good median survival of 682 days, although the patients’ survival was strictly dependent on BCLC stage.
Conclusion DSM-TACE is a safe and promising treatment alternative for patients with unresectable HCC who are ineligible for other loco-regional therapies.
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Rapid Response in Type A Aortic Dissection: Is There a Decisive Time Interval for Surgical Repair?
Authors: Gasser Simone , Stastny Lukas , Kofler Markus , Krapf Christoph , Bonaros Nikolaos , Grimm Michael , Dumfarth Julia 
Published: March 2020

Abstract
Background and Aim of the Study The objective was to evaluate whether there is a decisive time interval for patients to undergo surgery and to analyze if a rapid response in acute aortic dissection type A (AADA) affects patient selection.
Methods In 283 patients undergoing surgery for AADA, median time from onset of initial symptoms to skin incision was 6.9 hours (interquartile range [IQR], 5.0–11.7 hours). Patients were divided into three groups according to median time point of surgery (median ± 3 hours, i.e., 4–10; < 4; and >10 hours).
Results Almost 50% of patients presented in a critical preoperative state at hospital admission. Subanalysis identified patients being operated within 4 hours as an exclusive high-risk cohort (higher rates of preoperative neurologic dysfunction, tamponade, and cardiopulmonary resuscitation). Patients undergoing surgery between 4 and 10 hours showed a significantly better long-term survival (p = 0.021). Surgery within this time interval had a clear protective effect on 30-day mortality (odds ratio [OR]: 0.448. 95% confidence interval [CI]: 0.219–0.915). High age (OR: 1.037; 95% CI: 1.008–1.067), preoperative malperfusion syndrome (OR: 2.802; 95% CI: 1.351–5.811), and preoperative tamponade (OR: 2.621; 95% CI: 1.171–5.866) were factors predicting 30-day mortality.
Conclusion Rapid response in AADA interacts with the natural course of the disease resulting in an overrepresentation of critical patients. While the cohort below 4 hours represents the high-risk patients, time from symptom onset to initiation of surgery should not exceed 10 hours.
National Surgical, Obstetric, and Anesthesia Plans: Bridging the Cardiac Surgery Gap
Authors: Vervoort Dominique 
Published: March 2020

AbstractSix billion people worldwide lack access to safe, timely, and affordable cardiac surgical care when needed, despite cardiovascular diseases remaining the world's leading cause of mortality. The large surgical backlog of rheumatic heart disease, stable and high incidence of congenital heart disease, and growing burden of ischemic heart disease around the world calls for urgent scaling of cardiovascular services beyond mere prevention. National Surgical, Obstetric, and Anesthesia Plans are being developed by countries as holistic health systems interventions to increase access to surgical care, but to date, limited to no attention has been given to the inclusion of cardiovascular care.
Update: Splenic Artery Embolization in Blunt Abdominal Trauma
Authors: Patil Mangaladevi S. , Goodin Sean Z. , Findeiss Laura K. 
Published: March 2020

AbstractThe spleen is the most commonly injured organ after blunt abdominal trauma. Nonoperative management with splenic arterial embolization (SAE) is the current standard of care for hemodynamically stable patients. Current data favor the use of proximal and coil embolization techniques in adults, while observation is suggested in the pediatric population. In this review, the authors describe the most recent evidence informing the clinical indications, techniques, and complications for SAE.
Sterilization and Cross-Linking Combined with Ultraviolet Irradiation and Low-Energy Electron Irradiation Procedure: New Perspectives for Bovine Pericardial Implants in Cardiac Surgery
Authors: Walker Simona , Dittfeld Claudia , Jakob Aline , Schönfelder Jessy , König Ulla , Tugtekin Sems-Malte 
Published: March 2020

Abstract
Background Bovine pericardium is the major natural source of patches and aortic valve substitutes in cardiac repair procedures. However, long-term tissue durability and biocompatibility issues lead to degeneration (e.g., calcification) that requires reoperation. Tissue preparation strategies, including glutaraldehyde fixation, are reasons for the deterioration of pericardial tissues. We describe a pretreatment procedure involving sterilization and cross-linking combined with ultraviolet (UV) irradiation and low-energy electron irradiation (SULEEI). This innovative, glutaraldehyde-free protocol improves the mechanical aspects and biocompatibility of porcine pericardium patches.
Methods We adopted the SULEEI protocol, which combines decellularization, sterilization, and cross-linking, along with UV irradiation and low-energy electron irradiation, to pretreat bovine pericardium. Biomechanics, such as ultimate tensile strength and elasticity, were investigated by comparing SULEEI-treated tissue with glutaraldehyde-fixed analogues, clinical patch materials, and an aortic valve substitute. Histomorphological and cellular aspects were investigated by histology, DNA content analysis, and degradability.
Results Mechanical parameters, including ultimate tensile strength, elasticity (Young's modulus), and suture retention strength, were similar for SULEEI-treated and clinically applied bovine pericardium. The SULEEI-treated tissues showed well-preserved histoarchitecture that resembled all pericardial tissues investigated. Fiber density did not differ significantly. DNA content after the SULEEI procedure was reduced to less than 10% of the original tissue material, and more than 50% of the SULEEI-treated pericardium was digested by collagenase.
Conclusion The SULEEI procedure represents a new treatment protocol for the preparation of patches and aortic valve prostheses from bovine pericardial tissue. The avoidance of glutaraldehyde fixation may lessen the tissue degeneration processes in cardiac repair patches and valve prostheses.
On-site comparison of Quantum Hall Effect resistance standards of the NMIJ-AIST and the BIPM: Ongoing key comparison BIPM.EM-K12
Authors: Gournay Pierre , Rolland Benjamin , Oe Takehiko , Kaneko Nobu-Hisa 
Published: March 2020

The ongoing on-site comparison BIPM.EM-K12 is part of the BIPM programme implemented to verify the international coherence of the primary resistance standards. It allows National Metrology Institutes (NMIs) to validate their implementations of the Quantum Hall Effect (QHE) for dc resistance traceability by comparison to the reference maintained at the BIPM.
The realization of the ohm from the QHE-based standard of the NMIs at 100 Ω is compared with that realized by the BIPM from its own transportable quantum Hall resistance standard. This comparison is usually completed by scaling measurements from 100 Ω to 1 Ω and 10 kΩ through the measurement of the resistance ratios 100 Ω/1 Ω and 10 kΩ/100 Ω, respectively.
In November 2018, a new BIPM.EM-K12 on-site comparison was carried out at the National Metrology Institute of Japan (NMIJ-AIST). It was the first time the NMIJ-AIST participated in this comparison programme.
In the present comparison, only the measurements of the 100 Ω based on the quantum Hall effect and of the 10 kΩ/100 Ω ratio were compared. The reason why the 100 Ω/1 Ω ratio was not measured is detailed in the report.
Measurements of the 100 Ω transfer standard in terms of the conventional value of the von Klitzing constant, R
K-90, agreed to 1.8 parts in 109 with a relative combined standard uncertainty u
c = 8.7 × 10−9. Measurements of 10 kΩ/100 Ω ratio agreed to 6.8 parts in 109 with u
c = 8.3 × 10−9.

Main text

To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.
The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Comment on ‘Analysis of scissors cutting paper at super luminal speeds’
Authors: Iyer Chandru 
Published: March 2020

Abstract
In a recent paper, it was demonstrated that the popular legend that scissors can cut paper at super luminal speeds is indeed correct. In this comment, we make this additional observation that when the cutting speed is super luminal, the direction of the cutting of the paper as observed by observers in the inertial frame stationary with respect to the blade of the scissors and the direction of the cutting of the paper as observed by observers in the inertial frame stationary with respect to the paper are opposite. This follows from the relativity of simultaneity, and the fact that space-time points that are separated beyond reach at sub-luminal speeds exhibit a reversal in time order as observed by different inertial frames. The fact that the paper was cut in opposite directions as observed by the paper and scissors can be interesting facet for students of physics.
Research On An Improvement Of Indoor Positioning Algorithm
Authors: Ni Yunfeng , Shi Xiaohong , Li Changcong 
Published: March 2020

Abstract
Aiming at the relatively large positioning error in the traditional ranging positioning algorithm. This paper proposes a positioning algorithm based on the relationship between time and distance. The main advantage of this algorithm is that it does not need to measure the signal strength value, which avoids the positioning error caused by the attenuation of the signal during transmission. The algorithm mainly uses uw1000 as the positioning tag. When calculating the position coordinates, it first detects the positional relationship between the unknown node and the known node, and then enters the step-by-step algorithm to calculate the position coordinates under different positional relationships. Finally, the algorithm is verified by experiments. Compared with the traditional ranging positioning algorithm, the error is reduced and the accuracy is improved. The calculation process is simple and the algorithm complexity is low, but the used uw1000 has higher price than other ranging hardware. but the positioning effect is greatly improved and the application value is better.
Development and implementation of product interactive design platform based on 3D virtual vision
Authors: Junliang Wang 
Published: March 2020

Abstract
At present, the model of product interaction platform mostly adopts two-dimensional display, which has many defects, such as low interaction, heavy workload and difficult to update. Therefore, the 3D virtual vision is integrated into the product interaction design platform, and the product interaction scene is modeled according to the 3D virtual vision technology. By simulating product information with 3D digital model, we can realize the development of product interactive design platform based on 3D virtual vision. The platform includes interactive design module, 3D virtual vision display module and interactive display module. Firstly, this paper analyses the implementation process of platform construction structure. Then, this paper analyses the realization process of product interaction function. Finally, the human-machine interface of product interaction platform is analyzed.
Performance optimization of agricultural products website front-end based on user experience
Authors: Zhu Shengyin , He Xiangzhen , Yu Honzhi 
Published: March 2020

Abstract
With the rapid development of Internet technology, users have higher and higher requirements for the response speed of the website, which makes the performance optimization of the website become extremely important. How to solve this problem is the key to improving the user experience. In this paper, taking the characteristic agricultural product website as an example, we analyze the website front-end performance optimization in CSS optimization, page rendering, HTTP request reduction, Ajax caching and web caching, and offer the corresponding performance optimization methods.
Feature based Monocular Visual Odometry for Autonomous Driving and Hyperparameter Tuning to Improve Trajectory Estimation
Authors: Zheng Ziyang 
Published: March 2020

Abstract
In this paper, we will present an efficient feature-based localization method and use hyperparameter tuning to improve the accuracy of the method. We will first address the advantages of vision-based localization algorithms. These algorithms are more cost-efficient without GPS and are easier to integrate with vision based perception algorithms such as object detection and semantic segmentation. With camera equipped on cars, visual simultaneous localization and mapping, also called visual SLAM, improves many applications such as autonomous driving and advanced driver-assistance systems (ADAS). Currently, there are many different Visual SLAM algorithms and we will analyse the advantages of featured-based sparse methods. In the paper, we will briefly talk about the pipeline of our proposed method including feature extraction, key points matching, 8-point RANSAC algorithm and single value decomposition (SVD). Then we will use the grid search method to tune the parameters in the algorithm and improve the accuracy of the featured based visual localization method.
Enhancing named entity recognition from military news with bert
Authors: Qin Hao , Wang Yongli 
Published: March 2020

Abstract
Information extraction from news pages is often used in various fields. Named entity recognition is a key step in information extraction. News data is difficult to process because of it has unstructured characteristics. So the author proposes a method to perceive the relationship between words and sentences. The method is integrated with BERT(Bidirectional Encoder Representations from Transformers)-BiLSTM(Bi-directional LongShortTerm Memory)-CRF(Conditional Random Field), referred to as the Bertbc model. The model was tested on the People’s Daily dataset and text data from military news. The results show that this method improves the recognition accuracy, recall rate, f value and recognition effect.
A survey: Comparison between Convolutional Neural Network and YOLO in image identification
Authors: Cheng Richeng 
Published: March 2020

Abstract
The main purpose of this paper is discussing Convolutional Neural Network (CNN) family and You Only Look Once (YOLO) family, comparing with the structure of the frame, speed of calculating and efficiency of identifying objects. There are two main summaries. The first summary is that training Faster Region-based Convolutional Neural Networks (Faster R-CNN) can achieve excellent detection effect, which not only reduces the time cost but also improves the quality of the proposal. Therefore, the method of alternating training Region Proposal Network (RPN) + Faster R-CNN in the Faster R-CNN is more advanced than the original SlectiveSeach + Faster R-CNN. Another summary is that YOLO is a convolutional neural network that supports end-to-end training and testing and can detect and recognize multiple targets in images with certain accuracy.
The ability of junior high school students in drawing 3D pyramids
Authors: Meirida U , Johar R , Ahmad A 
Published: March 2020

Abstract
Drawing ability is part of the spatial ability, which is a crucial ability needed in science and daily life. Students often make a mistake in identifying objects in geometry learning. Students’ difficulties in identifying objects also occur in drawing a pyramid. This study aims to design student’s activities to determine the ability of junior high school students in drawing pyramids. The approach used in this study was a qualitative approach toward 28 students. Then, the researchers also did short interviews with four students. Results from the ability of junior high school students in drawing pyramids showed that 7% of 28 students were on level 1, 21% of the students were on level 2, 21% of the students were on level 3, and 19% of the students were on level 4. Meanwhile, 32% of the students were not able to draw all types of pyramids. Thus, most of the students still faced difficulties in drawing three-dimensional pyramids.