Solvent assisted dyeing of wool fibers with reactive dyes in a ternary solvent system for protecting fibers against damage

Aming Wang,Feng Liu,Liangjun Xia,Chunhua Zhang,Sijie Zhou,Zhuan Fu,Yunli Wang,Weilin Xu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-

Severe effluent pollution and chemical damage to protein fibers generated from conventional aqueousdyeing process have stimulated interest in exploiting sustainable dyeing of wool. Herein, an ethanol(EtOH)-carbon tetrachloride (CCl4)-water (H2O) ternary solvent system was used as the dyeing mediumto protect wool fibers from being damaged in the dyeing process. The wool fibers were firstly pretreatedin an aqueous acid solution, followed by dyeing in the EtOH-CCl4-H2O (45:50:5) ternary solvent systemwith reactive dyes. The results indicated that the acid pretreatment solution could be reused for severaltimes, the samples dyed in the EtOH-CCl4-H2O mixture with the investigated dyes showed higher K/S valuescompared to the conventional approach, implying the increased dye utilization and decreased effluentsdischarge were realized. Furthermore, acceptable permeability, good colorfastness, and satisfactoryleveling properties of the dyed samples were achieved using the developed method. Additionally, thesolvent-assisted dyed samples showed improved mechanical properties compared with the conventionallydyed samples. The dyeing mechanisms of wool fibers in the EtOH-CCl4-H2O mixture were illustratedin detail. The proposed dyeing technology consumes fewer energy, freshwater, and chemicals comparedwith the conventional wool dyeing method. Future work will principally concentrate on the reuse of thedye-contaminated EtOH-CCl4-H2O mixture.

Effects of a Death Education Intervention for Older People with Chronic Disease and Family Caregivers: A Quasi-Experimental Study

Weilin Chen,Hongmei Ma,Xiao Wang,Jiaojiao Chen 한국간호과학회 2020 Asian Nursing Research Vol.14 No.4

Purpose: To investigate the effectiveness of a structured death education program for older adults withchronic illness and their family caregivers. Methods: This study adopted two-group, nonrandomized quasi-experimental design. Patientecaregiverdyads in the intervention group (N ¼ 40 dyads) engaged in the death education program at the bedsideonce a week for 5 weeks, and were compared with participants (N ¼ 40 dyads) in the control group whoreceived usual health education. The program consisted of five sessions based on the Interaction Modelof Client Health Behavior. Death attitude, death competence, well-being, family function, and satisfactionwere measured at baseline (T0), immediately after the intervention (T1), and 1 month later (T2). Datacollection was conducted from July 30, 2019, to December 30, 2019. Results: The intention-to-treat analysis The intention-to-treat analysis of between groups at 1-monthfollow-up revealed that the intervention group had greater decreases in the fear of death (p=.002, 95% CI-2.53, -0.47; p<.001, 95% CI -3.61, -1.65) and death avoidance (p<.001, 95% CI -3.46, -1.84; p<.001, 95% CI-3.89, -2.43), had greater increases in the neutral acceptance (p=.032, 95% CI 0.05, 1.38; p<.001, 95% CI0.99, 2.56) and death competence (p<.001, 95% CI 4.10, 8.01; p<.001, 95% CI 7.80, 12.11) in patients andcaregivers, respectively. There were significant intergroup differences over time for patient well-being of(p<.001, 95% CI 3.06, 9.74) and satisfaction of (p<.001, 95% CI 2.01, 4.59). Results were consistent with theresults from the sensitivity analysis. Conclusion: This study demonstrated the feasibility and benefits of death education in hospitals andprovided an implementation plan for nursing professionals. Nurses should consider providing deatheducation for older adults with chronic diseases and their families to promote the development ofpalliative care and the quality of end-of-life.

Preparation and Dyeing of Superfine Down-powder/Viscose Blend Film

Wang Xin,Xu Weilin,Ke Guizhen The Korean Fiber Society 2006 Fibers and polymers Vol.7 No.3

Superfine down-powder/viscose blend films were prepared and characterized for their dyeing properties. Down-powder with average size of $2.56{\mu}m$ were suspended in viscose dope and blend films were obtained by solution casting. When the blend films were dyed with acid dye, the dye uptake and K/S values increased with the increase in down-powder content. Amino-acid analyses showed that amino acid component of the down were not affected during the film formation, which confirmed the changes of dye uptake and K/S value.

The Effect of Biological (Yeast) Treatment Conditions on Acrylamide Formation in Deep-fried Potatoes

Weilin Zhou,Miao Wang,Jian Chen,Ruohua Zhang 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.2

Effects of biological (yeast) treatments on acrylamide formation in deep-fried potatoes were studied. Potato chips were subjected to yeast fermentation prior to deep-frying to lower the level of reducing sugars and to reduce the amount of acrylamide. The solid-liquid ratio, fermentation temperature, and quantity of added yeast were studied. Optimum conditions for decreasing reducing sugar contents were a 1:4 solid-liquid ratio, a fermentation temperature of 37oC, and addition of 0.5% yeast. Potato strips treated under optimum conditions had 70% less acrylamide than control group chips after deep-frying. Yeast fermentation treatments are an effective way to reduce acrylamide formation in fried potatoes without influencing product quality.

A Method for Estimating the Transient Response Time of Turbochargers

Chenfang Wang,Mengmeng Ou,Xiang Gao,Weilin Zhuge,Yangjun Zhang 한국유체기계학회 2023 International journal of fluid machinery and syste Vol.16 No.3

Density Functional Theory Study on Triphenylamine-based Dye Sensitizers Containing Different Donor Moieties

Xu, Jie,Wang, Lei,Liang, Guijie,Bai, Zikui,Wang, Luoxin,Xu, Weilin,Shen, Xiaolin Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.9

Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have been employed to investigate the molecular structures and absorption spectra of two dyes containing diphenylaniline and 4-diphenylamino-diphenylaniline as donor moiety (TPA1 and TPA3). The geometries indicate that the strong conjugation is formed in the dyes. The electronic structures suggest that the intramolecular charge transfer from the donor to the acceptor occurs, and the electron-donating capability of 4-diphenylamino-diphenylaniline is stronger than that of diphenylaniline. The computed highest occupied molecular orbital (HOMO) energy levels are -5.31 and -4.90 eV, while the lowest unoccupied molecular orbital (LUMO) energies are -2.29 and -2.26 eV for TPA1 and TPA3, respectively, revealing that the interfacial charge transfer between the dyes and the semiconductor electrode are electron injection processes from the photon-excited dyes to the semiconductor conduction band. Furthermore, all the experimental absorption bands of TPA1 and TPA3 have been assigned according to the TDDFT calculations.

Influence of para-orientating Methoxyl Units on the Electronic Structures and Light Absorption Properties of the Triphenylamine-based dyes by DFT Study

Guijie Liang,Jie Xu,Weilin Xu,Luoxin Wang,Xiaolin Shen,Mu Yao 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7

The geometries, electronic structures and absorption spectra of the two organic triphenylamine-based dyes TASt-CA and TA-DM-CA, containing identical electron donors and acceptors but the different conjugated bridges, were studied by density functional theory (DFT) at the B3LYP and PBE1PBE levels, respectively. The influence of para-orientating methoxyl units on the electronic structures and light absorption properties of the dyes and the consequent photovoltaic performance of the dye-sensitized solar cells (DSSCs) were investigated in detail. The results indicate that the introduction of the para-orientating methoxyl units into the conjugated bridge induces the increased absorption wavelength as well as the more negative EHOMO corresponding to the bigger driving force (E_I^-/_(I3)^-)− EHOMO) for dye reduction, which together improve the photovoltaic performance of TA-DM-CA, although there is a decline of the open circuit voltage caused by the more negative E_(LUMO).

Adaptive flow optimization of a turbocharger compressor to improve engine low speed performance

Yangjun Zhang,Chenfang Wang,Zheng Xinqian,Weilin Zhuge,Yulin Wu,Jianzhong Xu 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.6

To improve the engine overall performance, an adaptive flow optimization procedure is proposed in this paper to synthesize turbocharger compressor optimum designs. Two objective functions are involved in the adaptive optimization. They are the traditional compressor design and the compressor design with consideration of improving engine overall performance. The two-step decomposition approach is chosen to generate optimum designs. The optimized designs not only satisfy turbomachinery and engine constraints but also have optimum objective function values in the two fields. Performance sensitivity analysis of compressor main design variables is performed for the flow optimization design process. A centrifugal compressor is redesigned for a turbocharged gasoline engine, as an example, based on the adaptive flow optimization process. The calculating results show a more than 5% increase of isentropic efficiency in comparison with the base line compressor, resulting in a more than 19% increase of engine torque at low speed conditions.

Density Functional Theory Study on Triphenylamine-based Dye Sensitizers Containing Different Donor Moieties

Jie Xu,Lei Wang,Guijie Liang,Zikui Bai,Luoxin Wang,Weilin Xu,Xiaolin Shen 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.9

Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have been employed to investigate the molecular structures and absorption spectra of two dyes containing diphenylaniline and 4-diphenylamino-diphenylaniline as donor moiety (TPA1 and TPA3). The geometries indicate that the strong conjugation is formed in the dyes. The electronic structures suggest that the intramolecular charge transfer from the donor to the acceptor occurs, and the electron-donating capability of 4-diphenylamino-diphenylaniline is stronger than that of diphenylaniline. The computed highest occupied molecular orbital (HOMO) energy levels are ‒5.31 and ‒4.90 eV, while the lowest unoccupied molecular orbital (LUMO) energies are ‒2.29 and ‒2.26 eV for TPA1 and TPA3, respectively, revealing that the interfacial charge transfer between the dyes and the semiconductor electrode are electron injection processes from the photonexcited dyes to the semiconductor conduction band. Furthermore, all the experimental absorption bands of TPA1 and TPA3 have been assigned according to the TDDFT calculations.

The Predictive Values of Pretreatment Controlling Nutritional Status (CONUT) Score in Estimating Short- and Long-term Outcomes for Patients with Gastric Cancer Treated with Neoadjuvant Chemotherapy and Curative Gastrectomy

Jin, Hailong,Zhu, Kankai,Wang, Weilin The Korean Gastric Cancer Association 2021 Journal of gastric cancer Vol.21 No.2

Purpose: Previous studies have demonstrated the usefulness of the controlling nutritional status (CONUT) score in nutritional assessment and survival prediction of patients with various malignancies. However, its value in advanced gastric cancer (GC) treated with neoadjuvant chemotherapy and curative gastrectomy remains unclear. Materials and Methods: The CONUT score at different time points (pretreatment, preoperative, and postoperative) of 272 patients with advanced GC were retrospectively calculated from August 2004 to October 2015. The χ² test or Mann-Whitney U test was used to estimate the relationships between the CONUT score and clinical characteristics as well as short-term outcomes, while the Cox proportional hazard model was used to estimate long-term outcomes. Survival curves were estimated by using the Kaplan-Meier method and log-rank test. Results: The proportion of moderate or severe malnutrition among all patients was not significantly changed from pretreatment (13.5%) to pre-operation (11.7%) but increased dramatically postoperatively (47.5%). The pretreatment CONUT-high score (≥4) was significantly associated with older age (P=0.010), deeper tumor invasion (P=0.025), and lower pathological complete response rate (CONUT-high vs. CONUT-low: 1.2% vs. 6.6%, P=0.107). Pretreatment CONUT-high score patients had worse progression-free survival (P=0.032) and overall survival (OS) (P=0.026). Adjusted for pathologic node status, the pretreatment CONUT-high score was strongly associated with worse OS in pathologic node-positive patients (P=0.039). Conclusions: The pretreatment CONUT score might be a straightforward index for immune-nutritional status assessment, while being a reliable prognostic indicator in patients with advanced GC receiving neoadjuvant chemotherapy and curative gastrectomy. Moreover, lower pretreatment CONUT scores might indicate better chemotherapy responses.