scholarly journals Preparation and Characterisation of Polyurethane Acrylate-Based Titanium Dioxide Pigment for Blue Light-Curable Ink

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3977
Author(s):  
Chenglong Wang ◽  
Luyang Qiao ◽  
Qiang Zhai ◽  
Kai Yan ◽  
Lili Wang ◽  
...  

Herein, a polyurethane acrylate-based TiO2 (PU-TiO2) was fabricated using a two-step method. First, a polyurethane prepolymer was prepared. Second, PU-TiO2 was prepared using amino-modified TiO2 (A-TiO2). The best synthesis process of the polyurethane prepolymer was when the reaction temperature was 80 °C, the reaction time was 3 h and the R-value of the polyurethane acrylate was 2. Next, the influence of the A-TiO2 content on the structure and performance of PU-TiO2 was examined. The analysis of the rheological properties of the PU-TiO2 ink indicated that its viscosity gradually increased as the A-TiO2 content increased. The tensile performance of film improved because of the presence of A-TiO2. The photo-polymerisation and photo-rheological performance indicated that the PU-TiO2 structure changed from a hyperbranched structure with TiO2 as the core to a segmented structure, as the A-TiO2 content was 3%.

2021 ◽  
Vol 27 (1) ◽  
pp. 63-67
Author(s):  
Xuemei WANG ◽  
Xiang GUI ◽  
Yingping QI ◽  
Yongfeng SHEN ◽  
Hua LI

A novel epoxy cyclohexane-based polyurethane material was synthesized from a self-made epoxy cyclohexane-tetrahydrofuran (CHO-THF) co-polyether. Due to the special rigid six-membered ring skeleton in the polyether molecular chain, the polyurethane materials have excellent mechanical properties, good optical transparency and weather resistance. In this paper, the synthesis process of the epoxy cyclohexane-based polyurethane material was studied and the properties of the material were tested. The results showed that curing parameters R value had effects on the mechanical properties and optical transparency of the material.


2021 ◽  
Author(s):  
Yu Qiao ◽  
Na Lv ◽  
Dong Li ◽  
Hongji Li ◽  
Xiangxin Xue ◽  
...  

Metastable Cu2O is an attractive material for the architecture design of integrated nanomaterials. In this context, Cu2O was used as the sacrificial agent to form the core-shell structure of Cu2O@HKUST-1...


2020 ◽  
Vol 8 (3) ◽  
pp. 488-499
Author(s):  
Endang Tirtana Putra ◽  
Abdi Rezki

This study applies multiple linear regression analysis with the SPSS Version 16.0 program. To get estimate and good interpretation of this study, the samples studied are set to 32 respondents. Data are collected through a questionnaire to measure quantitative variables with a Likert scale. The results of this study show that there is a relationship between independent variables on dependent variable, and it can be explained that: (1) Remuneration variable does not have significant impact on employee performance, with a regression coefficient of 0.181 and significant rate 0.104 (> 0.05). (2) Motivation variable has significant impactt on employee performance with a regression coefficient of 0.559 and significant rate 0,000 (<0.05). (3) Independent variables simultaneously have significant impact on employee performance with regression coefficient of 1.094 and significant rate 0.000 (<0.05). R² value shows 0.589 or 58.9%. Employee performance variable is affected by Remuneration and Motivation Variables and the remaining 41.1% is affected by other variables.Keywords : Remuneration, Motivation and Performance


2020 ◽  
Vol 18 (1) ◽  
pp. 73-83
Author(s):  
Marie-Anne Kohl

This article discusses the construction and representation of nature in the composition and performance of Meredith Monk’s song cycle “Facing North” by analyzing the quality of the performing voices, their physicality, and by bringing them into relation to the associations and contexts evoked by the songs’ titles. Based on voice and nature concepts in cultural studies, this article argues that this approach creates a very specific concept of nature, which is artistic and artificial at the same time. Through contextualising the concept of nature established in “Facing North” with a specific, gendered construction of nature as basis of a narrative of North American identity as depicted by musicologist Denise Von Glahn, it becomes evident how the composition and performance of “Facing North” at once accord with and oppose to a gendered concept of nature.


2018 ◽  
Vol 21 (3) ◽  
pp. 353-364 ◽  
Author(s):  
Carolina Castaldi ◽  
Marco S. Giarratana

This article analyzes the effects of diversification and brand breadth on firm performance for professional service firms (PSFs). The research aim is two-fold. First, we test whether moving into products may put at risk the core resources that sustain PSFs’ competitive advantage. Second, we study which branding strategies best match their diversification attempts. Broad (narrow) brands characterize a branding strategy with scarce (plentiful) associations to specific product characteristics. We analyzed trademark portfolios of 47 U.S.-based management consulting firms in the 2000 to 2009 time period. Panel regression results suggest that (1) PSFs always benefit from diversification when they remain pure-service providers; (2) performance is positively related to a strategy of specialized narrow brands.


Author(s):  
Gëzim Visoka

This chapter provides a new account of identity and practices of agents in the context of post-conflict peacebuilding. It investigates how place, habitus, and fields of interaction alongside the performative roles shape the identity of agents and their socialization in practice. To explore the relation between the agents’ presence and their impact on peacebuilding, this paper bypasses the exclusionary dichotomies between local/international and liberal/indigenous agents, and develops a typology of six types of agents horizontally arranged around their insideness and outsideness towards a particular conflict-affected place. Using human geography and critical hermeneutics, this paper categorises ‘agents of peace’ in six different types: existential insiders, subjective insiders, empathetic insiders, behavioural insiders, objective outsiders, and existential outsiders. The core argument of this article is that the differentiation of agents around the geographical and performance towards a particular place facilitates the exploration of pluralist forms of agency and a more nuanced understanding of dynamics in post-conflict societies. An expanded and plural view of agents captures better the fields of interaction and hybridization, agential knowledge and narratives, modes of governance, and various everyday practices that enable or inhibit sustainable peace.


Author(s):  
Chunxiao Xing ◽  
Chun Zeng ◽  
Zhiqiang Zhang ◽  
Lizhu Zhou

Personalization service is becoming one of the core services in digital libraries, and an exciting and challenge research area. In this chapter, we analyze several key technologies and the related works in information filtering and personalized services, and then present a content-based personalized searching algorithm and a probabilistic model to represent user interests, which is more effective than the vector space model by the experiments. To solve the data sparsity and scalability problems in collaborative filtering, we present new methods for similarity computation and instance selection. The experiments show it is higher predicted precision and performance than the others. Based on the above research results, we design and develop a prototype, TH-PASS, which provides personalized searching and recommending services.


2020 ◽  
Vol 61 (2) ◽  
pp. 252-271
Author(s):  
Elyssa Livergant

February 2010. The lights are off. As I adjust to the dark I can make out shapes of others scattered around the room. Disoriented and uncertain I wait for some sign or direction of what to do. The air is thick with anticipation, but as time drags it becomes clear that no instructions are coming. Then it begins all around me. Sat in the dark in a workshop in the courtroom studio of Toynbee Studios, I begin to feel anxious. I see the outline of another body in front of me and I panic. I should do something. I reach for anything that might keep things working, that might keep play going. Does anyone want to dance, I ask. I waltz. I sense someone dancing behind me.In what follows I think through my participation in a 2010 workshop led by Anne Bean, recounted in part above, to understand better the role of play in the conditions of production for theatre and performance under capital. Bean is an interdisciplinary artist, belonging to (or claimed by) multiple experimental art scenes, including visual, performance, and sound art, who has been a central figure of European live art since the 1970s. The workshop, which was conducted largely in the dark and focused on the aestheticization of cooperation through an emphasis on its participants doing play was held at Artsadmin's Toynbee Studios, the influential UK arts producing organization's home in East London. This article puts my account of Bean's workshop in conversation with Victorian economist Arnold Toynbee's demand for a new capitalist morality. Toynbee's appeal was, of course, not directed at me or the other workshop participants disoriented and uncertain in the dark. But, I argue, the situation of play that arose in Bean's workshop is a contemporary iteration of what Toynbee called a gospel of life, a term referring to a commitment to self and civic betterment at the core of a burgeoning capitalist morality. The connection between the shaping of Victorian labor practices and the staging of cooperation between participants in Bean's contemporary workshop is the basis for this essay's core assertion: that the value of play as a counterpoint to work within practices and discourses of theatre and performance needs considerable rethinking.


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