How Does Green Product Knowledge Effectively Promote Green Purchase Intention?

Knowledge can influence the whole decision-making process of consumers. While green product knowledge is often conceptualized as a direct antecedent of green purchase intention, empirical findings in support of this relationship are inconsistent. Based on 236 samples, this study investigates how green product knowledge promotes consumers’ green purchase intention. Results show that green trust and perceived consumer effectiveness partly mediate the relationship between green product knowledge and green purchase intention. The relationship between green trust and green purchase intention is positively moderated by perceived price. Compared with low perceived price, green trust has a greater effect on green purchase intention in the case of high perceived price. However, the relationship between perceived consumer effectiveness and green purchase intention is not moderated by perceived price. This study provides a new insight into green product knowledge and how to promote green purchase intention, and the findings help government and enterprises to formulate strategies to promote consumers’ green purchase intention

The origin of granular convection in vertically vibrated particle beds: The differential shear flow field

This paper investigates the particle scale dynamics of granular convection in vertically vibrated granular beds. The onset of the convection is found to coincide with the noticeable particle transverse migrations from the side walls towards the centre of the bed, which only take place in the wake of the gravity wave front dividing the upward moving particles and the falling ones. The mechanism driving the particle inward flows and thus sustaining the complete convection rolls can be understood in light of a convection model based on void penetration. This stochastic convection model reveals that the underlying driving force is a distinctive differential shear flow field arising from the combined effect of frictional holdback by the walls and the downward pull of gravity. The changes of the convection pattern with inceasing acceleration amplitude, in terms of the convection strength and the thickness of the bottom of the convection rolls, can be accounted for by this model

Effect of straw return with nitrogen fertilizer on photosynthetic characteristics and yield of rice in soda saline–alkali rice paddy fields

Many studies have shown that straw return to the field can promote the production of photosynthetic material for crops, and thus increase crop yields. Due to the different effects of straw return to the field in different areas, there are fewer studies on the photosynthetic characteristics and yield of rice after straw return to the field in Northeast soda saline–alkali rice area, and it is not clear whether straw return reduces the amount of nitrogen fertilizer used in the area. Using the local large-scale cultivar Baijing 1 as the material, we studied the effects of straw return with nitrogen fertilizer (0, 90, 180, 270 and 360 kg ha−1) on the photosynthetic characteristics and seed yield of rice in saline–sodic areas through a 2 years field trial. The results of this experiment showed that rice yield was highly significantly and positively correlated with canopy total photosynthetically active radiation (TIPAR), leaf area index (LAI), relative chlorophyll content (SPAD), net photosynthetic rate (Pn), stomatal conductance (gs), transpiration rate (Tr), Rubisco activity and PSII maximum photochemical efficiency (Fv/Fm) but significantly and negatively correlated with intercellular CO2 concentration (Ci). Compared with the treatment without straw return, straw return increased TIPAR, LAI, SPAD, Pn, gs, Tr and yield of rice when N ≥ 180 kg N ha−1. The rice yield was the highest when the nitrogen application rate was 270 kg ha−1. The yield of straw return treatment under this nitrogen fertilizer was 8.01 t ha−1, and the yield of no straw return treatment was 7.52 t ha−1 (average 2 years). In addition, the results suggested that approximately 36–43% of chemical N fertilizer reduction would not affect rice yield with straw addition. Our results suggest that straw return is a promising management practice in soda saline–alkali rice areas that can reduce the application of mineral nitrogen fertilizer without losing rice yield

Self-etched bimetallic hybrid derived cobalt/zinc dual-sites coordinated N, P-codoped hollow carbon polyhedron for efficient oxygen reduction reaction

Hollow structure with hierarchical pore is benefit for the exposure of active sites, showing great advantages in electrocatalysis. Whereas, it still a challenge for the target preparation of such architecture in a simple, but efficient ways. Herein, a Co/Zn-Nx (Nx represents the number of N atoms (x) coordinated with Co or Zn atoms) dual sites anchored N, P-codoped hollow carbon polyhedron (PZH-800) with well-defined Co species was facilely prepared via direct pyrolysis of a bimetallic hybrid (PZH) obtained by polymerization-coating of Zn-porphyrin polymer on the surface of zeolitic-imidazolate-framework (ZIF-67). The hollow architecture was formed via self-etching, in which the hydrochloric acid produced during the formation of hybrid etched the inner acid-degradable ZIF-67. Different with post-etching method, self-etching could really preserve the original structure and catalytic sites, better regulate the electronic structures, enhancing the catalytic activity. Compared with the Co or Zn mono-doped sample, PZH-800 presented an enhanced ORR activity with a half-wave potential (E1/2) of 0.94 V (vs. RHE), as well as outstanding stability, outperforming commercial Pt/C (20%) in alkaline media. Impressively, ZABs using PZH-800 as the cathodic catalyst demonstrated a maximum power density (280 mW cm−2), coupled with a remarkable running stability, surpassing the battery catalyzed by Pt/C. This work paves a new avenue for the future development of MOF-derived non-precious metal-based hollow catalysts

High-strength type-B sleeve for pipeline girth weld repair and its key application technology

In recent years, the repair technology of type-B sleeves has been widely used for the hazard control of pipeline girth welds. However, the prominent problems such as the unreasonable geometrical dimension of sleeve and the delayed cracking of fillet weld are exposed in the girth weld defect repairing of high-strength pipelines with type-B sleeves. In order to solve the problems faced in the application of type-B sleeves and meet the requirements of girth weld defect repair in high-strength pipeline, the design method for geometric dimension of type-B sleeves and the recommendations on value of key parameters were proposed after research. Meanwhile, X65/X70 type-B sleeves were developed through the research on special composition design and processing technology, with the weight about 20%?30% lighter than the traditional Q345R sleeves. Besides, the technical requirements, including the welding conditions (pipeline transportation pressure and flow rate of medium), preheating temperature, welding mode and post-weld heat treatment, were provided, and the selection scheme of welding material for X70 type-B sleeves was put forward. Considering the delayed cracking of sleeve fillet weld, it is suggested to cancel the root welding and the inter-layer magnetic particle detection, add the ultrasonic phased array detection after welding and the magnetic particle detection 48 hours after welding. The reliability of X65/X70 type-B sleeves has been verified by full-scale laboratory test and field application demonstration, and the sleeves have been successfully applied to the repair of girth weld defects of X80 high-strength pipelines

Growth performance, carcass traits, meat quality, and blood variables of small-sized meat ducks with different feed efficiency phenotypes

ABSTRACT: The study investigated the effects of feed efficiency (residual feed intake, RFI and residual intake and gain, RIG) on the production performance of small-sized meat ducks. Ninety ducks with intermediate and extreme (high and low) RFI values were selected from 1,083 male ducks of similar body weight, and the 3 groups were then redivided according to RIG. For both efficiency measures, the feed conversion ratio (FCR) and average daily feed intake (ADFI) of efficient ducks were significantly lower than those of inefficient ducks (P 0.05). RIG had positive effects on the pH1 value of the breast muscle (P 0.05). With regard to blood biochemical parameters, efficient ducks had significantly lower triglycerides (TG) (P < 0.05). Correlation analysis demonstrated that RFI was positively correlated with average daily feed intake and feed conversion ratio (P < 0.05), while RIG exhibited a strong negative correlation with both (P < 0.05). The average daily body weight gain was positively correlated with RIG (P < 0.05). RIG had a positive effect on the pH1 value of the breast muscle (P < 0.05). Furthermore, triglyceride and high-density lipoprotein cholesterol levels correlated with both efficiency classifications (P < 0.05). Overall, the efficiency measures did not affect the carcass and meat quality of small-sized meat ducks but could identify ducks with lower feed consumption and fast growth

Integrating genomic and multiomic data for <i>Angelica sinensis</i> provides insights into the evolution and biosynthesis of pharmaceutically bioactive compounds

Angelica sinensis roots (Angelica roots) are rich in many bioactive compounds, including phthalides, coumarins, lignans, and terpenoids. However, the molecular bases for their biosynthesis are still poorly understood. Here, an improved chromosome-scale genome for A. sinensis var. Qinggui1 is reported, with a size of 2.16 Gb, contig N50 of 4.96 Mb and scaffold N50 of 198.27 Mb, covering 99.8% of the estimated genome. Additionally, by integrating genome sequencing, metabolomic profiling, and transcriptome analysis of normally growing and early-flowering Angelica roots that exhibit dramatically different metabolite profiles, the pathways and critical metabolic genes for the biosynthesis of these major bioactive components in Angelica roots have been deciphered. Multiomic analyses have also revealed the evolution and regulation of key metabolic genes for the biosynthesis of pharmaceutically bioactive components; in particular, TPSs for terpenoid volatiles, ACCs for malonyl CoA, PKSs for phthalide, and PTs for coumarin biosynthesis were expanded in the A. sinensis genome. These findings provide new insights into the biosynthesis of pharmaceutically important compounds in Angelica roots for exploration of synthetic biology and genetic improvement of herbal quality