Research on Blended Teaching Mode of Weaving Course

Through the reform of informatization teaching mode, the blended teaching mode combining “online teaching” learning and “offline teaching” in classroom teaching is very important for the construction of weaving science. Blended teaching mode gives full play to the classroom teaching function of the online network teaching platform, while increasing the learning function of offline students, and also provides a platform for offline teacher-student exchanges. Continuously improving the integration of the network teaching platform and the blended teaching system will be of great significance to the theoretical study of the weaving course, professional construction and the training of textile engineering professionals. It has important promotion value in the construction of weaving courses and the construction of other textile engineering courses

Discussion on the Course Teaching of Textile Economics

Textile economics is a discipline that uses the basic principles and methods of economics to study textile production, sales and international trade. Learning the course is conducive to training applied senior engineering and technical personnel who understand both technology and management. There are problems such as students have no foundation in economics, students have no enthusiasm for studying textile economics, not enough teachers in textile economics, unreasonable textbook layout, single teaching methods and means, lack of teaching experience, teaching resources and teaching conditions, etc. Therefore, the teaching of textile economics is in urgent need of reform

Preparation of UV-resistant PET fibres by direct melt spinning with on-line addition

In order to solve the uniform dispersion of inorganic particles and dispersion characterization, a batch of UV-resistant fibres has been manufactured by direct melt spinning with on-line addition. By combining image analysis software with OM images, the dispersion of TiO2 has been quantitatively analyzed. The formula of mass fraction of inorganic particles in fibre is deduced on the basis of crystallinity, and the calculated value is found consistent with theoretical value. Additionally, the comparative study of direct spinning and chip spinning shows that the former presents better dispersion of inorganic particles and superior performance. The tenacity of fibres from melt-direct spinning increases by 13.87%， the CV value decreases by 75.19% and Heywood diameter of TiO2 particles decreases by 13.97%. According to national standard (GB/T 18830-2009), UPF values of the fabric are found much greater than the standard [UPF>40, T(UVA)<5%]

Key roles of amylopectin synthesis and degradation enzymes in the establishment and reactivation of chronic toxoplasmosis

Abstract Toxoplasma gondii (T. gondii) is an obligate intracellular parasite with a wide range of hosts, including humans and many warm-blooded animals. The parasite exists in two interconvertible forms, namely tachyzoites and bradyzoites in intermediate hosts that are responsible for acute and chronic infections respectively. Mature bradyzoites accumulate large amounts of amylopectin granules but their roles have not been fully characterized. In this study, the predicted key enzymes involved in amylopectin synthesis (UDP-sugar pyrophospharylase, USP) and degradation (alpha-glucan water dikinase, GWD) of ME49 strain were individually knocked out, and then bradyzoite-related phenotyping experiments in vitro and in vivo were performed to dissect their roles during parasite growth and development. Deletion of the usp or gwd gene in the type II strain ME49 reduced the replication rates of tachyzoites in vitro and parasite virulence in vivo, suggesting that amylopectin metabolism is important for optimal tachyzoite growth. Interestingly, the Δusp mutant grew slightly faster than the parental strain under stress conditions that induced bradyzoite transition, which was likely due to the decreased efficiency of bradyzoite formation of the Δusp mutant. Although the Δgwd mutant could convert to bradyzoite robustly in vitro, it was significantly impaired in establishing chronic infection in vivo. Both the Δusp and Δgwd mutants showed a dramatic reduction in the reactivation of chronic infection in an in vitro model. Together, these results suggest that USP and GWD, which are involved in amylopectin synthesis and degradation have important roles in tachyzoite growth, as well as in the formation and reactivation of bradyzoites in T. gondii

Functional diversity and soil nutrients regulate the interannual variability in gross primary productivity

Global change, encompassing rising temperatures and an increase in extreme precipitation events, has influenced vegetation photosynthesis; this can be seen in the gross primary productivity (GPP) of terrestrial ecosystems, which, over time affects the global carbon cycle. The impact of climate on interannual variability in GPP (GPPIAV) has been extensively explored in the literature. Other changing factors driven by global change, such as biodiversity and soil nutrient availability, are vital in predicting the future of the biosphere. However, the roles of these factors remain unclear. - We combined (i) data from 454 community plots collected using standard protocols from 2013 to 2019 across China, (ii) plant trait data and phylogenetic information of more than 2500 plant species, and (iii) soil nutrient data that we measured. Using these data from 72 "real-world" ecosystems located across a range of environmental conditions and species pools, we investigated the role of environmental factors including temperature, precipitation and soil nutrients and multifaceted diversity (i.e. species richness, hypervolume-based functional diversity, and phylogenetic diversity) in mediating the magnitude of GPPIAV using multi-model averaging and structural equation modelling. - We found that soil nutrients and functional diversity are the main determinants of the magnitude of GPPIAV and that climate effects are predominantly mediated by multifaceted diversity. - Synthesis. We provide strong evidence that ecosystems with higher biodiversity have less variable annual biomass production and decrease the extent of GPPIAV through compensatory effects across diverse ecosystems. Nutrient-rich ecosystems are likely to buffer the impact of climate variability on ecosystem carbon uptake better than nutrient-poor ecosystems. Our results demonstrate that biodiversity plays a crucial role in buffering the effects of environmental variability on carbon uptake in terrestrial ecosystems

Open-Circuit Voltage Enhancement on the Basis of Polymer Gel Electrolyte for a Highly Stable Dye-Sensitized Solar Cell

Dye-sensitized solar cells (DSSC) have received considerable attention owing to their low preparation cost and easy fabrication process. However, one of the drawbacks that limits the further application of DSSC is their poor stability, arising from the leakage and volatilization of the liquid organic solvent in the electrolyte. Therefore, to improve the long-term stability of DSSC, polymer gel electrolyte was studied to replace the conventional liquid electrolyte in this work. The results show that compared to liquid electrolyte, DSSC with polymer gel electrolyte has a smaller short-circuit current (Jsc), which decreases with the increase of the polymer gelator. Nevertheless, with the employment of the polymer gel electrolyte, there is a significant enhancement of open-circuit voltage (Voc), and it increases with the increase of the polymer gelator content. The highest Voc, up to 0.873 V, can be obtained for DSSC with a 30% polymer gelator content. The impact of the polymer gel electrolyte on the photovoltaic performance of DSSC, especially on Voc, was studied by analyzing the charge-transfer kinetics in the polymer gel electrolyte. Furthermore, the influence of the polymer gel electrolyte on the long-term stability of DSSC was also investigated

Preparation of UV-resistant PET fibres by direct melt spinning with on-line addition

312-317In order to solve the uniform dispersion of inorganic particles and dispersion characterization, a batch of UV-resistant fibres has been manufactured by direct melt spinning with on-line addition. By combining image analysis software with OM images, the dispersion of TiO2 has been quantitatively analyzed. The formula of mass fraction of inorganic particles in fibre is deduced on the basis of crystallinity, and the calculated value is found consistent with theoretical value. Additionally, the comparative study of direct spinning and chip spinning shows that the former presents better dispersion of inorganic particles and superior performance. The tenacity of fibres from melt-direct spinning increases by 13.87%，the CV value decreases by 75.19% and Heywood diameter of TiO2 particles decreases by 13.97%. According to national standard (GB/T 18830-2009), UPF values of the fabric are found much greater than the standard [UPF>40, T(UVA)<5%]

Mechanistic insight into the individual ionic transportation in polymer electrolytes for use in dye-sensitized solar cells

Polymer electrolytes, acting as an ionic solid-state conducting phase, have been demonstrated as promising charge carrying mediators for energy storage devices. However, the large majority of polymer electrolyte studies are focused on cation transportation and little consideration has been given to the investigation of the anion transportation mechanism. In this study we focus on the individual ionic transportation mechanisms in polymer electrolytes for potential application in dye-sensitized solar cells (DSSCs). To explore the ionic transportation mechanism, polymer electrolytes with different ion concentrations were studied. The influence of ion concentration on the structure of the polymer electrolytes was elucidated using X-ray diffraction (XRD) and Raman spectroscopy. Additionally, the temperature and composition dependence of the ionic conductivity and restricted ion diffusion coefficientof the polymer electrolytes were studied to gain an insight into the ionic transportation mechanism. The behavior of the anion transportation was further discussed via the addition of I2 into the polymer electrolytes. The results imply that the disorder and flexibility of the polymer matrix are favorable for ionic transportation, and that mass transportation can be facilitated by increasing the I2 concentration in the polymer electrolyte, which could be applied in DSSCs

Low-Temperature Preparation of Hierarchical Structure TiO2 for Flexible Dye-Sensitized Solar Cell

Photoanodes for flexible DSSC have been prepared through a chemical sintering method using hydrothermal cement at low temperature of 120 degrees C. The addition of the hydrothermal cement can effectively increase the adhesion between the photoanode and flexible ITO-PET substrate and build the interconnection between nanoparticles at low temperature for the fast transport of electrons. The flexible DSSC based on the photoanode obtains a relatively high photo-to-electric conversion efficiency of 4.0%. The method basing on the commercially available TiO2 with a small proportion of hydrothermal cement is suitable for roll-to-roll screen-printing preparation, which is expected to be scaled up for mass production of high performance flexible DSSCs

Cyclin D1 G870A polymorphism and risk of nasopharyngeal carcinoma: a case-control study and meta-analysis.

BACKGROUND:Cyclin D1 (CCND1) plays a key role in cell cycle regulation. It is a well-established human oncogene which is frequently amplified or overexpressed in cancers. The association between CCND1 G870A polymorphism and cancer risk has been widely assessed. However, a definitive conclusion between CCND1 G870A polymorphism and risk of nasopharyngeal carcinoma (NPC) remains elusive. METHODS:We firstly performed a hospital-based case-control study involving 165 NPC cases and 191 cancer-free controls in central-south China, and then conducted a meta-analysis with six case-control studies to evaluate the association between NPC risk and CCND1 G870A polymorphism. RESULTS:The case-control study found a significant association between CCND1 G870A polymorphism and NPC risk in various comparison models (AA vs. GG: OR = 2.300, 95% CI 1.089-4.857, p = 0.029; AG vs. GG: OR = 2.832, 95% CI 1.367-5.867, p = 0.005; AA/AG vs. GG: OR = 2.597, 95% CI 1.288-5.237, p = 0.008; AA vs. AG/GG:OR = 0.984, 95% CI 0.638-1.518, p = 0.944). Further meta-analysis showed that there was no significant association between CCND1 G870A polymorphism and NPC risk in overall analysis. In the stratified analysis by race, however, significant associations were only found in Caucasians (for the allele model A vs. G: OR = 0.75, 95% CI 0.59-0.97, p = 0.03; for the co-dominant model AA vs. GG: OR = 0.52, 95% CI 0.32-0.86, p = 0.01; for the dominant model AA/AG vs. GG: OR = 0.49, 95% CI 0.32-0.74, p<0.01; for the recessive model AA vs. AG/GG:OR = 0.90, 95% CI 0.61-1.34, p = 0.60). CONCLUSIONS:A significant association between CCND1 G870A polymorphism and NPC risk was found in the central-southern Chinese population. The meta-analysis indicated that CCND1 G870A polymorphism may contribute to the development of NPC in Caucasians