Multiple-effect membrane distillation （MEMD） process for enriching semi-volatile organic acids from their individual aqueous solutions was performed by using a hollow fiber-based air gap membrane distillation （AGMD...Multiple-effect membrane distillation （MEMD） process for enriching semi-volatile organic acids from their individual aqueous solutions was performed by using a hollow fiber-based air gap membrane distillation （AGMD） module with the function of internal heat recovery. Aqueous solutions of glyoxylic acid, glycolic acid, lactic acid, pyrnvic acid, malonic acid and glutaric acid were used as model feed. For a feed of 1% （mass fraction）, each acid could be enriched for 8--20 times, which depended on the surface tension of the concentrate. The operation performance of MEMD process was characterized by permeation flux J, performance ratio PR and acid rejection rate R. The effects of cold feed-in temperature, heated feed-in temperature, feed-in volumetric flow rate and feed-in concen- tration on MEMD performance were experimentally evaluated. Maximum values of J, PR and R were 4.8 L/（h-m2）, 9.84 and 99.93%, respectively. Moreover, MEMD process demonstrated a fairly good stability in a long-term experiment lasting for 30 d when aqueous solution of 4% （mass fraction） lactic acid was used as a feed.展开更多
The objective of the study was to examine the relationships between work-family interfase,job satisfaction and job performance in an Argentinian workers sample.A cross-sectional empirical study,based on explicative-as...The objective of the study was to examine the relationships between work-family interfase,job satisfaction and job performance in an Argentinian workers sample.A cross-sectional empirical study,based on explicative-associative strategy was designed.An availability sample of 383 workers(195 male)from different kinds of organizations was conformed.Based on past evidence,it was hypothesized the mediator role of job satisfaction.Structural equation analysis showed that the indirect effects of work-family interfase dimensions(conflict and enrichment)on job performance through job satisfaction were statically significant,which indicated partial mediation.All variables explained 72%of job performance variance.The study provides new evidence regarding the interrelations between job-family articulation and individual job performance,illuminating the crucial role played by satisfaction.Empirical findings and practical implications of the study are discussed.展开更多
文摘Multiple-effect membrane distillation （MEMD） process for enriching semi-volatile organic acids from their individual aqueous solutions was performed by using a hollow fiber-based air gap membrane distillation （AGMD） module with the function of internal heat recovery. Aqueous solutions of glyoxylic acid, glycolic acid, lactic acid, pyrnvic acid, malonic acid and glutaric acid were used as model feed. For a feed of 1% （mass fraction）, each acid could be enriched for 8--20 times, which depended on the surface tension of the concentrate. The operation performance of MEMD process was characterized by permeation flux J, performance ratio PR and acid rejection rate R. The effects of cold feed-in temperature, heated feed-in temperature, feed-in volumetric flow rate and feed-in concen- tration on MEMD performance were experimentally evaluated. Maximum values of J, PR and R were 4.8 L/（h-m2）, 9.84 and 99.93%, respectively. Moreover, MEMD process demonstrated a fairly good stability in a long-term experiment lasting for 30 d when aqueous solution of 4% （mass fraction） lactic acid was used as a feed.
文摘The objective of the study was to examine the relationships between work-family interfase,job satisfaction and job performance in an Argentinian workers sample.A cross-sectional empirical study,based on explicative-associative strategy was designed.An availability sample of 383 workers(195 male)from different kinds of organizations was conformed.Based on past evidence,it was hypothesized the mediator role of job satisfaction.Structural equation analysis showed that the indirect effects of work-family interfase dimensions(conflict and enrichment)on job performance through job satisfaction were statically significant,which indicated partial mediation.All variables explained 72%of job performance variance.The study provides new evidence regarding the interrelations between job-family articulation and individual job performance,illuminating the crucial role played by satisfaction.Empirical findings and practical implications of the study are discussed.
