Polymers for Advanced Technologies最新文献

{"title":"Parameter estimation of epoxy resin cure kinetics by dynamics DSC data","authors":"Nihal Puhurcuoğlu, Yusuf Arman","doi":"10.1002/pat.6498","DOIUrl":"https://doi.org/10.1002/pat.6498","url":null,"abstract":"This study focused on determining the curing kinetic parameters of amine‐epoxy resin by performing dynamic DSC tests. The Kissinger and Crane equations were used to determine the activation energy, the pre‐exponential factor, and the reaction order as kinetic parameters for curing. The Ozawa equation was also used to determine the activation energy that changes at different levels of cure during the reaction. The average activation energy obtained by the Ozawa method was compared with the Kissinger activation energy. In addition, the T‐β extrapolation method was used to determine the optimum curing temperature. The kinetic parameters obtained from the Kissinger and Crane equations were used in the n<jats:sup>th</jats:sup>‐order kinetic model to predict the degree of cure at a given time and temperature. The linear regression fitting method was used in Minitab software to determine the curing parameters. The results were evaluated based on the fitting parameters. This study provides a theoretical basis for the curing mechanisms of epoxy matrix fiber composites used in the manufacture of wind turbine blades.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"145 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141572077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plasma treated‐double layer electrospun fiber mats from thermoplastic polyurethane and gelatin for wound healing applications","authors":"Arzu Yıldırım, Eray Sarper Erdoğan, Seyma Caglayan, Rüya Keskinkaya, Yurdanur Turker, Funda Karbancıoğlu‐Güler, Dilara Nur Dikmetaş, Saime Batirel, Melek Erol Taygun, F. Seniha Guner","doi":"10.1002/pat.6487","DOIUrl":"https://doi.org/10.1002/pat.6487","url":null,"abstract":"Conventional wound treatment options provide a barrier against exogenous microbial penetration but cannot simultaneously provide an antibacterial characteristic and promote healing. However, bioactive dressings can accelerate wound healing and have an antibacterial effect in addition to being able to cover and protect lesions. In this study, double‐layer thermoplastic polyurethane (TPU)‐gelatin fibrous dressings that mimic the epidermis and dermis layers of the skin were fabricated via electrospinning technique. As a bioactive agent, <jats:italic>Hypericum perforatum oil</jats:italic> (HPO) was utilized to impart antibacterial and therapeutic properties to the dressings. Tannic acid was also used in fiber mat formulations as a cross‐linking agent. Oxygen plasma treatment was applied as a surface activation technique to improve adhesion of TPU and gelation layers. The fiber structure of the mats was revealed by a scanning electron microscopy (SEM) study. Fourier transform infrared (FTIR) spectroscopy was used to demonstrate HPO loading onto the mats. The water vapor transmission rate (WVTR) and fluid absorbency of the mats were compared with some commercial dressings. According to these results, it can be suggested that the mats can be used for moderate to high exudative wounds. All dressings, even the control sample showed antibacterial features against both <jats:italic>Staphylococcus aureus</jats:italic> and <jats:italic>Escherichia coli</jats:italic> bacteria due to the tannic acid. In vitro wound healing assays were carried out on the plasma‐treated sample and it was observed that the sample did not negatively affect the migration and proliferation abilities of the cells which are necessary for wound healing. Overall results indicated that the plasma‐treated fibrous mat would be a good candidate as a wound dressing material having an antibacterial character.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"17 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing conductivity in polymers: The role of metal ions in conducting polymer systems","authors":"Ashish K. Sarangi, Lizaranee Tripathy, Azaj Ansari, Ranjan K. Mohapatra, Sushil Kumar Bhoi","doi":"10.1002/pat.6505","DOIUrl":"https://doi.org/10.1002/pat.6505","url":null,"abstract":"As metal ion inclusion has a substantial effect on conducting polymer's mechanical, optical, and electrical properties, it has attracted a lot of attention. This article delves into the complex role of metal ions in conducting polymers, explaining how they affect functionality, structural stability, and conductivity enhancement. The review starts with a synopsis of conducting polymers and doping processes before diving into the particular ways that metal ions interact with polymer matrices to alter their electronic structure and charge transport characteristics. The importance of characterization techniques in comprehending the structure–property correlations is highlighted in the discussion of metal‐ion doped conducting polymer studies. In addition, the paper looks at the uses of conducting polymers doped with metal ions in numerous sectors, including energy storage, electronics, and sensors. The difficulties in attaining accurate control over doping concentrations and guaranteeing stability over an extended period are discussed, as well as potential avenues for future development in this area. This review offers important insights into the development and optimization of functional materials for a variety of applications by thoroughly investigating the function of metal ions in conducting polymers.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"24 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SegNet‐VOLO model for classifying microplastic contaminants in water bodies","authors":"Rajendran Thavasimuthu, P. M. Vidhya, S. Sridhar, P. Sherubha","doi":"10.1002/pat.6497","DOIUrl":"https://doi.org/10.1002/pat.6497","url":null,"abstract":"In recent times, microplastics (MPs) have emerged as notable contaminants within several environments, especially in water bodies. The characterization and description of MPs necessitate extensive and laborious analytical methods, making this part of MPs research an essential issue. In this research, SegNet‐Vision Outlooker (VOLO), a computer vision and deep learning (DL)‐based model, is proposed for detecting and classifying MPs present in a water environment. This research model includes step‐by‐step processes such as data collection, preprocessing, filtering and enhancement, augmentation, segmentation, feature extraction, and classification for detecting MPs. The key objective of this research model is to improve the classification accuracy in detecting MPs and to validate the model's effectiveness in handling holographic images. The Holographic Image MPs dataset is collected and used to evaluate the model. In preprocessing, image rescaling is performed to match the proposed model's input resolution as 224 × 224. After rescaling, the images are applied to remove noise using a bilateral filtering technique. The contrast‐limited adaptive histogram equalization (CLAHE) method is applied to enhance the image with better contrast and brightness, which helps the model to segment and classify the images accurately. The enhanced images are applied to the SegNet model for segmentation, which segmented the images according to the MP classes. Based on the segmented images, the VOLO‐D1 model extracted the features and classified the images to detect the MPs present in the images. The SegNet‐VOLO model attained 97.70% detection rate, 98.26% accuracy, 98.13% F1‐score, and 98.62% precision. These performances are compared with the various existing models discussed in the review, where the research model outperformed all the models with better performances.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"14 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electroactive additives into polyurethanes for high corrosion resistance coatings for mild steel","authors":"Ermiya Prasad P, Kashmiri Borah, Aruna Palanisamy, Chepuri R. K. Rao","doi":"10.1002/pat.6502","DOIUrl":"https://doi.org/10.1002/pat.6502","url":null,"abstract":"There is a demand for innovative coatings such as polyurethane (PU) in industrial and commercial sectors to effectively combat corrosion on mild steel substrates. In this work, novel redox‐active polyurea (PUr) additives such as PUr‐diamine capped trimer (DCTA) and PUr‐diamine‐capped tetraaniline (DCTAni), derived from DCTA and DCTAni, were synthesized to enhance the anticorrosion properties of PU coatings. These are characterized using <jats:sup>1</jats:sup>H nuclear magnetic resonance spectroscopy, Fourier transformed infrared, and high‐resolution mass spectrometry technical methods. These additives (2, 5, and 10 wt%) were dispersed in a polyurethane‐urea (PUU) matrix, which was synthesized from PTMG‐2000, and IPDI with dihydrazide adipate as a chain extender. The electroactivity of the coatings were evaluated using cyclic voltammetry (CV) and ultraviolet–visible spectroscopy. Furthermore, anticorrosion performance was assessed through electrochemical impedance spectroscopy and Tafel potentiodynamic polarization measurements. The optimal corrosion protection was achieved with increasing weight percent (wt%) of additive in PUU, showing a trend of 10% &gt; 5% &gt; 2%. Coatings reported maximum polarization resistance (<jats:italic>R</jats:italic><jats:sub>p</jats:sub>) of 122.15 MΩ, with corrosion rates (<jats:italic>C</jats:italic><jats:sub>R</jats:sub>) as low as 2.38 × 10<jats:sup>−6</jats:sup> mm/year. Accelerated salt spray testing over 600 h in a 5 wt% NaCl salt fog confirmed the coatings' durability. The microstructures of PUr particles were determined through FESEM characterization. Additive‐blended PUUs exhibited moderate tensile strength and elongation at break compared to the reference PUU matrix. The hydrophobicity of both the reference sample (PUU) and the additive‐blended coatings was measured, with the highest recorded value being at 93.1 ± 0.048 for 10 wt%. Thermal gravimetric analysis demonstrated polymer degradation with a maximum of <jats:italic>T</jats:italic><jats:sub>5%</jats:sub> observed at 304.1°C.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"48 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anti‐inflammatory and pro‐healing effects of acetate chitosan sponge with calcium cross‐links","authors":"Liu Chang, Wang Shengdong, Zhang Huien, Liu Liping","doi":"10.1002/pat.6504","DOIUrl":"https://doi.org/10.1002/pat.6504","url":null,"abstract":"Chitosan, a potential material for tissue wound repair, exhibits limitations like poor solubility and low gel strength. Acetate chitosan (CA) was synthesized through ethanol precipitation, while acetate chitosan sponge (CA‐Ca) was created using the freeze‐drying method with CaCO<jats:sub>3</jats:sub> as cross‐linking agents. The addition of CaCO<jats:sub>3</jats:sub> enhanced the mechanical strength of the sponges formed by CA, but affected the water absorption performance of the sponge. Both CA and CA‐Ca demonstrated antioxidant properties, with CA‐Ca showing slightly higher maximal scavenging rates for DPPH and hydroxyl radicals compared to CA. Concentrations ranging from 1 to 500 μg/mL of CA and CA‐Ca exhibited a proliferative effect on L929 and RAW264.7 cells. Furthermore, both CA and CA‐Ca promoted the migration of L929 cells, with CA‐Ca showing a higher maximal healing rate within 24 h compared to the control group. Additionally, both materials reduced the levels of TNF‐αand IL‐6 in inflammatory RAW264.7 cells, thereby alleviating the inflammatory response. Moreover, CA and CA‐Ca stimulated collagen secretion in fibroblasts without inducing excessive secretion. CA sponge demonstrated the ability to accelerate in vitro coagulation, while CA‐Ca‐8 (CA:CaCO<jats:sub>3</jats:sub> 1:8) sponge, prepared with 2% CA, exhibited the most effective coagulation. Overall, CA‐Ca has suitable characteristics such as water absorption, coagulation, cytocompatibility, anti‐inflammatory properties, and promoting cell healing, laying the foundation for its potential clinical applications.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"2015 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent advances in scaffold based electrospun for breast cancer research","authors":"Parya Ebrahimbaygi, Mohammad Rasool Khazaei, Parham Valadbeigi, Gelavizh Rostaminasab, Abdolhamid Mikaeili, Touraj Ahmadi Jouybari, Leila Rezakhani","doi":"10.1002/pat.6499","DOIUrl":"https://doi.org/10.1002/pat.6499","url":null,"abstract":"One of the biggest challenges facing public health in the modern era is the management of cancer, a global health issue. Breast cancer (BC) is the most common malignancy among women worldwide. Among the most popular cancer treatment modalities are radiation, chemotherapy, and surgery. Chemotherapy, however, is regarded as the primary treatment option for cancer that has progressed to the final and metastatic stages. However, because of things like toxicity to healthy cells, poor drug absorption, trouble getting drugs to target tumor sites, and low therapeutic efficacy, traditional chemotherapy approaches are frequently insufficient. Nanotechnology offers the potential to overcome some of these limitations by creating new materials with unique properties through electrospinning. A straightforward and reasonably priced technique for creating biomaterials that can replicate the topography and structure of the cellular matrix is electrospinning. These materials have a large surface area, can be mechanically controlled, and have a level of fibers that can be adjusted from micrometers to nanometers. This review article emphasizes the potential of electrospun scaffolds for the treatment of BC while also offering a basic understanding of the procedure and nanostructured fibrous materials. This article reviews the most recent emerging electrospinning techniques in BC therapy. First, it briefly introduces the progress made in electrospinning in BC research over the past few years. Next, it investigates electrospinning by summarizing the techniques and materials used in the process. In addition, it demonstrates how crucial electrospinning three‐dimensional (3D) models are for the diagnosis and treatment of BC. This article also clarifies numerous electrospinning uses in several fields, such as cell culture, drug delivery, drug loading, and gene therapy. The final section discusses the advantages, limitations, and challenges electrospinning is willing to encounter in BC research.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"364 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation, characterization, and antistatic applications of high‐density polyethylene/polyaniline blends","authors":"Ayse Nur Ozkan, Kamil Sirin","doi":"10.1002/pat.6501","DOIUrl":"https://doi.org/10.1002/pat.6501","url":null,"abstract":"To obtain electrostatic charge dissipative (ESD) materials, high‐density polyethylene (HDPE) and polyaniline (PANI) blends are synthesized by the solution blending method. To prepare the blends, 0.5, 1.0, and 3.0 wt% of PANI are introduced into the HDPE matrix. The prepared blends are investigated by Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA), and scanning electron microscope (SEM). Additionally, stress–strain curves are used to examine the blends' mechanical properties. Polyaniline additions indicated an increase in thermal stability by approximately 1°C in the blends but decrease in mechanical properties. The four‐probe technique is used to determine the electrical conductivity of blends, which is found to be between 10<jats:sup>−7</jats:sup> and 10<jats:sup>−10</jats:sup> S/cm. The results of the conductivity values have indicated that all blends have great potential to be used as antistatic materials. For antistatic applications, the ESD performance of the blends is determined at different corona voltages. Blends achieved the antistatic requirements with a 10% cutoff decay time of approximately 2.0 s and a 1/e time of approximately 1.0 s, demonstrating quick dissipation of static charges. According to antistatic decay times, it has been shown that all blends obtained in this study can be used as antistatic material at 3 kV corona voltage.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"44 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multifunctional skin dressings synthesized via one‐pot photopolymerization: Advancing wound healing and infection prevention strategies","authors":"M. Emilia Zambroni, Sol R. Martínez, Gonzalo E. Cagnetta, Luis E. Ibarra, Ariana Posadaz, Josefa F. Martucci, Silvia Romanini, Ernesto Alejandro Aramayo, Ana Lucía Cabral, Patricia Bertone, Rodrigo E. Palacios, María Lorena Gómez","doi":"10.1002/pat.6490","DOIUrl":"https://doi.org/10.1002/pat.6490","url":null,"abstract":"In the field of wound healing treatment, the development of new materials is essential to cover multiple functions, such as acceleration of the healing process, prevention of infection and response to stimuli, especially if they present lower costs or are easier to manufacture. These properties are of great importance to prompt skin cicatrization. In this work, new multifunctional skin dressings for wound healing and infection prevention are developed based on new hydrogel materials. The dressings are produced via a straightforward and environmentally friendly one‐pot photopolymerization manufacturing process utilizing vitamin B2 aqueous solutions as sensitizer, and energy‐efficient blue light sources. These dressings exhibit a high swelling capacity, pH and temperature responsiveness, biocompatibility, antimicrobial activity in the absence of conventional antibiotics, and are capable of promoting wound healing. The formulation is based on the combination of three monomers: 2‐((methacryloyloxy)ethyl)trimethylammonium chloride, methacrylic acid and N‐vinyl caprolactam. Collagen, hyaluronic acid, and essential oil of hop are added to enhance antimicrobial properties and stimulate regenerative cellular processes. <jats:italic>In vivo</jats:italic> experiments have demonstrated that pristine dressings are superior in promoting collagen and fibroblast regeneration and accelerating cicatrization as compared to dressings containing natural products. The dressing embedded with hop also displayed antimicrobial characteristics. The preparation and testing of these new efficient wound dressings are described. This study is distinctive in its integration of environmentally conscious manufacturing techniques with innovative material formulations, resulting in superior wound dressings that are both cost‐effective and highly functional. By achieving enhanced healing and infection prevention without the employment of conventional antibiotics, this work represents a substantial advancement in sustainable and effective wound care management.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"3 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of ionic impurities on the dielectric properties of lignin","authors":"Sergey S. Khviyuzov, Aleksandr S. Volkov","doi":"10.1002/pat.6467","DOIUrl":"https://doi.org/10.1002/pat.6467","url":null,"abstract":"Lignin is one of the most common biopolymers. The application of the electrophysical properties of the polymer is one of the directions of its use. The effect of impurities potassium bromide with an ionic crystal lattice on the electrophysical properties of lignin has been shown. The study of the frequency dependences of the specific electrical conductivity and the components of the complex dielectric permittivity in the frequency range from 6 × 10<jats:sup>−2</jats:sup> to 6 × 10<jats:sup>7</jats:sup> rad s<jats:sup>−1</jats:sup> was carried out. The nonadditivity of the electrophysical properties of the lignin‐potassium bromide system has been shown. It is established that the relaxation time of the <jats:italic>π</jats:italic>‐electrons of the aromatic rings of lignin depends on the content of potassium bromide in the mixture and varies from 1.6 × 10<jats:sup>−7</jats:sup> (100% lignin) to 7.5 × 10<jats:sup>−4</jats:sup> s (1% of KBr in mixture). The orientation of the positive charge of potassium atom of the KBr dipole atom to the <jats:italic>π</jats:italic>‐electrons of the benzene ring of lignin leads to change of high‐frequency relaxation time. This effect can be used in frequency filter to eliminate electronic polarization in the high‐frequency region. Thus, the polarization of ionic impurities has a significant effect on the dielectric properties of lignin in the region of medium and high frequencies of alternating electric field.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"37 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}