Search results for: Weiwei Zhang

Items from 1 to 20 out of 652 results

article

Multi‐fidelity surrogate reduced‐order modeling of steady flow estimation

Xu Wang, Jiaqing Kou, Weiwei Zhang

International Journal for Numerical Methods in Fluids > 92 > 12 > 1826 - 1844

A multi‐fidelity reduced‐order model (ROM), which incorporates low‐fidelity data to improve the prediction of high‐fidelity results, is proposed for the reconstruction of steady flow field at different conditions. The spatial basis functions of low‐fidelity and high‐fidelity data, which are generated for all training sets are extracted separately by proper orthogonal decomposition. Then a surrogate...

article

Enhanced mechanical and flame retardancy properties of vinyl ester resin systems with the synthesis of two flame retardants with vinyl group

Xin Zhang, Weiwei Zhang, Wenchao Zhang, Rongjie Yang

Polymer International > 69 > 12 > 1196 - 1206

Two PEPA‐based (PEPABFR) and DOPO‐based (DOPOBFR) flame retardants with vinyl groups were synthesized successfully via 1‐oxyphospha‐4‐hydroxymethyl‐2,6,7‐trioxabicyclo[2.2.2]octane (PEPA) or 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene 10‐oxide (DOPO) with isocyanoethyl methacrylate using a one‐pot method. Their structures were confirmed using Fourier transform infrared, ¹H NMR and ³¹P NMR spectroscopies...

article

Nickel ammonium phosphate and reduced graphene oxide two‐dimensional hybrid material for improving the fire safety and mechanical properties of poly(vinyl chloride)

Jiahe Li, Weihua Meng, Weihong Wu, Zhaoxi Zhou, more

Polymer International > 69 > 12 > 1227 - 1236

In this study, a hybrid material with band‐shaped nickel ammonium phosphate monohydrate (NiNH₄PO₄.H₂O) (ANP) and reduced graphene oxide (RGO) was devised by the one‐pot method. This material is a novel, efficient and non‐halogen flame retardant and smoke suppressant. Based on the characterization results, a crystal growth and thermal decomposition process of ANP is proposed, which proves that it has...

article

Elective surgery cancellations due to the COVID‐19 pandemic: global predictive modelling to inform surgical recovery plans

COVIDSurg Collaborative, Dmitri Nepogodiev, Omar M Omar, James C Glasbey, more

British Journal of Surgery > 107 > 11 > 1440 - 1449

Background The COVID‐19 pandemic has disrupted routine hospital services globally. This study estimated the total number of adult elective operations that would be cancelled worldwide during the 12 weeks of peak disruption due to COVID‐19. Methods A global expert response study was conducted to elicit projections for the proportion of elective surgery that would be cancelled or postponed during...

article

Prevalence and clinical significance of common respiratory pathogens in the upper respiratory tract of children with community‐acquired pneumonia in Zunyi, China

Xinmiao Li, Weiwei Zhang, Shifei Yao, He Zha, more

Pediatric Pulmonology > 55 > 9 > 2437 - 2443

Purpose To estimate the prevalence of common respiratory pathogens among children with community‐acquired pneumonia (CAP) in Zunyi City, Guizhou, China, and to assess whether the presence of common respiratory pathogens in patients is associated with disease severity. Patients and Methods This retrospective study assessed the prevalence of common respiratory viruses and bacteria in the upper respiratory...

article

Associations between social capital and trust in general practitioners among the elderly people: Empirical evidence from China

Weiwei Zhang, Yuankai Huang, Hongjie Zhou, Guohua Lin, more

Health & Social Care in the Community > 28 > 5 > 1590 - 1602

Elderly individuals’ trust in general practitioners (GPs) is conducive to enhancing their health outcomes and promote healthy ageing. However, this trust has been declining in recent decades. Social capital is associated with patients’ trust in healthcare providers in several countries, which make it a potential path for improving the trust of the elderly people in GPs in China, but it is not yet...

article

Mechanical and flame‐retardant properties and thermal decomposition of vinyl ester resin modified by different phenyl silsesquioxanes

Weiwei Zhang, Wenchao Zhang, Zhaolu Qin, Xin Zhang, more

Polymers for Advanced Technologies > 31 > 8 > 1836 - 1846

The mechanical properties and fire resistance of vinyl ester resin (VER) composites containing cage‐shaped octaphenyl silsesquioxane (OPS), incompletely cage‐shaped phenyl silsesquioxane (PhT₇POSS), and ladder‐shaped phenyl silsesquioxane (PPSQ) were investigated. The POSS structure and dispersion have a great influence on the mechanical properties, thermal stability, and decomposition process of...

article

Study on flame retardancy of APP/PEPA/MoO₃ synergism in vinyl ester resins

Gaofeng Zeng, Weiwei Zhang, Xin Zhang, Wenchao Zhang, more

Journal of Applied Polymer Science > 137 > 35 > n/a - n/a

A range of flame retardant vinyl ester resins (VERs) samples have been produced containing different contents of PEPA (1‐oxo‐4‐hydroxymethyl‐2,6,7‐trioxa‐l‐phosphabicyclo[2.2.2]octane), APP (ammonium polyphosphate), and MoO₃ (molybdenum trioxide). By investigating the flame retardancy of VER samples such as limiting oxygen index and UL‐94, the synergistic flame retardance of APP, PEPA, and MoO3 has...

article

Phenanthrene‐Fused‐Quinoxaline as a Key Building Block for Highly Efficient and Stable Sensitizers in Copper‐Electrolyte‐Based Dye‐Sensitized Solar Cells

Huiyun Jiang, Yameng Ren, Weiwei Zhang, Yongzhen Wu, more

Angewandte Chemie International Edition > 59 > 24 > 9324 - 9329

Dye‐sensitized solar cells (DSSCs) based on Cu^II/I bipyridyl or phenanthroline complexes as redox shuttles have achieved very high open‐circuit voltages (V_OC, more than 1 V). However, their short‐circuit photocurrent density (J_SC) has remained modest. Increasing the J_SC is expected to extend the spectral response of sensitizers to the red or NIR region while maintaining efficient electron injection...

article

Phenanthrene‐Fused‐Quinoxaline as a Key Building Block for Highly Efficient and Stable Sensitizers in Copper‐Electrolyte‐Based Dye‐Sensitized Solar Cells

Huiyun Jiang, Yameng Ren, Weiwei Zhang, Yongzhen Wu, more

Angewandte Chemie > 132 > 24 > 9410 - 9415

article

Synergistic inhibition effect of N‐(furan‐2‐ylmethyl)‐7H‐purin‐6‐amine and iodide ion for mild steel corrosion in 1 mol/L HCl

Weiwei Zhang, Hui‐Jing Li, Ankai Wang, Chengshuai Ma, more

Materials and Corrosion > 71 > 3 > 498 - 507

The synergistic inhibition effect of N‐(furan‐2‐ylmethyl)‐7H‐purin‐6‐amine (FYPA) and iodide ion on mild steel corrosion in 1 mol/L HCl was investigated using weight‐loss tests, electrochemical techniques, and surface analysis. The experiments revealed that the FYPA + KI mixture was a temperature‐dependent inhibitor, which strongly inhibited the corrosion of mild steel compared with FYPA. Based on...

article

Facile synthesis and electrochemical properties of a novel Ni-B/TiC composite coating via ultrasonic-assisted electrodeposition

Baosong Li, Weiwei Zhang

Ultrasonics Sonochemistry > 2020 > 61 > C

A novel Ni-B/TiC composite coating was synthesized by ultrasonic-assisted direct current electrodeposition. Ultrasonic technology was adopted to prevent the agglomeration of nanoparticle, improve the structure and corrosion resistance, using an ultrasonic bath at frequency 40 KHz and acoustic power 300 W. The influences of current density and deposition time on its structure and electrochemical behaviors...

article

Synergistic Coassembly of Highly Wettable and Uniform Hole‐Extraction Monolayers for Scaling‐up Perovskite Solar Cells

Erpeng Li, Enbing Bi, Yongzhen Wu, Weiwei Zhang, more

Advanced Functional Materials > 30 > 7 > n/a - n/a

All organic charge‐transporting layer (CTL)‐featured perovskite solar cells (PSCs) exhibit distinct advantages, but their scaling‐up remains a great challenge because the organic CTLs underneath the perovskite are too thin to achieve large‐area homogeneous layers by spin‐coating, and their hydrophobic nature further hinders the solution‐based fabrication of perovskite layer. Here, an unprecedented...

article

Characterization and expression of SLO1 potassium channels during spermatogenesis in Eriocheir sinensis

Weiwei Zhang, Han Zhang, Shumei Mu, Juhui Yan, more

Aquaculture Research > 51 > 3 > 890 - 905

SLO1 potassium channels are pivotal to many aspects of spermatogenic cell. Experiments were conducted to assess physiology and function of SLO1 potassium channels in different developmental stages of spermatogenic cell in Eriocheir sinensis. First, the expression of SLO1 protein was examined via Western blot, RT‐PCR, immunohistochemistry and immunofluorescence assays. The results showed that the expression...

article

Transition of cellulose supramolecular structure during concentrated acid treatment and its implication for cellulose nanocrystal yield

Lida Xing, Chuanshuang Hu, Weiwei Zhang, Litao Guan, more

Carbohydrate Polymers > 2020 > 229 > C

Cellulose nanocrystals with cellulose I and II allomorphs (CNC-I and CNC-II) were prepared from eucalyptus cellulose I substrate by controlling the sulfuric acid hydrolysis conditions, including acid concentration (56–64 wt%), reaction temperature (45 or 60 °C) and time (10–120 min). The crystalline structures were verified by XRD and ¹³ C-NMR. CNC-II only appeared at very restricted reaction conditions...

article

Design, synthesis, and antilung adenocarcinoma activity research of novel paeonol Schiff base derivatives containing a 1,2,3‐triazole moiety

Yuqin Jiang, Yanyan Li, Tingting Yang, Xin Shi, more

Journal of the Chinese Chemical Society > 67 > 1 > 165 - 171

A new series of paeonol Schiff base derivatives containing a 1,2,3‐triazole moiety were synthesized using the copper(I) catalyzed azide‐alkynecycloaddition (CuAAC) reaction and evaluated for their cytotoxicity in vitro against human cervical carcinoma HeLa cells, human lung cancer A549 cells, and human liver cancer HepG2 cells. Unfortunately, all the tested compounds showed poor activities toward...

article

The Effect of Different Smoke Suppressants with APP for Enhancing the Flame Retardancy and Smoke Suppression on Vinyl Ester Resin

Xin Zhang, Weiwei Zhang, Gaofeng Zeng, Jianxin Du, more

Polymer Engineering & Science > 60 > 2 > 314 - 322

Flame retarded and smoke suppressed vinyl ester resin (VER) were prepared through ammonium polyphosphate (APP) coupled with different smoke suppressants. The flame retardancy of these composites was tested by the limiting oxygen index and UL‐94 tests. The typical combustion parameters including heat release rate (HRR), peak of HRR (p‐HRR), total heat release, smoke production rate, and total smoke...

article

Flame retardant and mechanism of vinyl ester resin modified by octaphenyl polyhedral oligomeric silsesquioxane

Weiwei Zhang, Xin Zhang, Gaofeng Zeng, Kang Wang, more

Polymers for Advanced Technologies > 30 > 12 > 3061 - 3072

Flamability is one of the major issues for utilization of bisphenol A–type vinyl ester resin (VER) polymeric composites in practical applications. The thermal stability and mechanical property of VER composites containing octaphenyl polyhedral oligomeric silsesquioxane (OPS) were investigated and discussed in detail. With increasing the mass ratio of OPS, the residues yield at 800°C and bending strength...

article

Do clerkship schemes effectively improve pharmacy students’ understanding of and attitudes regarding pharmaceutical care?——a pre-post study in China Pharmaceutical University

Yuankai Huang, Dongning Yao, Weiwei Zhang, Yitao Wang, more

BMC Medical Education > 2019 > 19 > 1 > 1-9

Background Clerkship is potentially an effective measure of improving the pharmacy students’ understanding of and attitudes toward pharmaceutical care. This research aimed to validate whether clerkship schemes in China effectively improve pharmacy students’ understanding of and attitudes toward PC, and discuss on how to improve the clerkship schemes for better quality. Methods A pre-post and self-administrated...

article

Preimplantation genetic testing for a family with usher syndrome through targeted sequencing and haplotype analysis

Haining Luo, Chao Chen, Yun Yang, Yinfeng Zhang, more

BMC Medical Genomics > 2019 > 12 > 1 > 1-8

Background Preimplantation genetic testing for monogenic defects (PGT-M) has been available in clinical practice. This study aimed to validate the applicability of targeted capture sequencing in developing personalized PGT-M assay. Methods One couple at risk of transmitting Usher Syndrome to their offspring was recruited to this study. Customized capture probe targeted at USH2A gene and 350 kb flanking...

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INFONA - science communication portal

Search results for: Weiwei Zhang

Multi‐fidelity surrogate reduced‐order modeling of steady flow estimation

Enhanced mechanical and flame retardancy properties of vinyl ester resin systems with the synthesis of two flame retardants with vinyl group

Nickel ammonium phosphate and reduced graphene oxide two‐dimensional hybrid material for improving the fire safety and mechanical properties of poly(vinyl chloride)

Elective surgery cancellations due to the COVID‐19 pandemic: global predictive modelling to inform surgical recovery plans

Prevalence and clinical significance of common respiratory pathogens in the upper respiratory tract of children with community‐acquired pneumonia in Zunyi, China

Associations between social capital and trust in general practitioners among the elderly people: Empirical evidence from China

Mechanical and flame‐retardant properties and thermal decomposition of vinyl ester resin modified by different phenyl silsesquioxanes

Study on flame retardancy of APP/PEPA/MoO₃ synergism in vinyl ester resins

Phenanthrene‐Fused‐Quinoxaline as a Key Building Block for Highly Efficient and Stable Sensitizers in Copper‐Electrolyte‐Based Dye‐Sensitized Solar Cells

Phenanthrene‐Fused‐Quinoxaline as a Key Building Block for Highly Efficient and Stable Sensitizers in Copper‐Electrolyte‐Based Dye‐Sensitized Solar Cells

Synergistic inhibition effect of N‐(furan‐2‐ylmethyl)‐7H‐purin‐6‐amine and iodide ion for mild steel corrosion in 1 mol/L HCl

Facile synthesis and electrochemical properties of a novel Ni-B/TiC composite coating via ultrasonic-assisted electrodeposition

Synergistic Coassembly of Highly Wettable and Uniform Hole‐Extraction Monolayers for Scaling‐up Perovskite Solar Cells

Characterization and expression of SLO1 potassium channels during spermatogenesis in Eriocheir sinensis

Transition of cellulose supramolecular structure during concentrated acid treatment and its implication for cellulose nanocrystal yield

Design, synthesis, and antilung adenocarcinoma activity research of novel paeonol Schiff base derivatives containing a 1,2,3‐triazole moiety

The Effect of Different Smoke Suppressants with APP for Enhancing the Flame Retardancy and Smoke Suppression on Vinyl Ester Resin

Flame retardant and mechanism of vinyl ester resin modified by octaphenyl polyhedral oligomeric silsesquioxane

Do clerkship schemes effectively improve pharmacy students’ understanding of and attitudes regarding pharmaceutical care?——a pre-post study in China Pharmaceutical University

Preimplantation genetic testing for a family with usher syndrome through targeted sequencing and haplotype analysis

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