The Longitudinal Impact of IT Self-Efficacy and Interest on Intent to Major

Although enrollment in information technology has increased, it cannot match the growth of the IT labor market with more students needed to enter into the IT field to fulfill demand. This research follows high school students for two years regarding the choice of IT as a college major using the lens of social cognitive career theory (SCCT) to better understand career decision-making over time. Self-efficacy, interest, and intent to major relationships are examined both cross-sectionally and longitudinally. Findings show that IT self-efficacy has a significant positive effect on interest and intent to major respectively and interest in IT has a significant positive effect on intent to major in IT. These are consistent with previous research in SCCT. Contrarily, only IT self-efficacy increases over time, while intent to major decreases during this same two-year time period

Hydrodynamics and heat transfer of suspended surface in a supercritical cfb furnace

With the scaling-up of CFB boilers, more heating surfaces like suspended surfaces and/or mid-partition walls, are arranged in the furnace to ensure adequate heat absorption. The length of suspended surface reaches almost half height of the furnace in the Baima 600MW supercritical CFB boiler. Since the gas-solids hydrodynamics and heat transfer on those surfaces are different from that on waterwall, further researches are needed to investigate the characteristics of hydrodynamics and heat transfer on the suspended surfaces. Beside the experimental measurements on the suspended surfaces in a scale down test rig, the hydrodynamic characteristics on the suspended surfaces were computed by a CFD simulation combined with EMMS model in a supercritical CFB of annular furnace. The results present an uneven axial solid concentration profile on the suspended surface, and descending particles are found on some locations especially where those surfaces far away from the furnace exits. Based on the gas-solids hydrodynamic results, the modified cluster renewal model was applied in the heat transfer coefficient calculation of the suspended surfaces. The result shows the heat transfer coefficient varies with the height and it has difference between two sides of a surface. In addition, the average heat transfer coefficients of suspended surface at different locations are compared. References Basu P, Nag P K. Heat transfer to walls of a circulating fluidized-bed furnace[J]. Chemical Engineering Science, 1996, 51(1): 1-26. Cen K F, Ni M J, Luo Z Y, et al. Theoretical design and operation of circulating fluidized bed boiler[J]. China Electric Power Press, Beijing, 1998: 647-663. Cheng L M, Wang Q H, Shi Z L, et al. Heat transfer in a large circulating fluidized bed boiler[J]. Journal of Power Engineering, 2006, 26(3): 305-310. Huang C, Cheng L M, Zhou X L, et al. Suspended surface heat transfer in a large circulating fluidized bed boiler furnace[J]. Journal of Zhejiang University. Engineering Science, 2012, 46(11): 2128-2132. Sundaresan R, Kolar A K. Axial heat transfer correlations in a circulating fluidized bed riser[J]. Applied Thermal Engineering, 2012. * “Strategic Priority Research Program” of the Chinese Academy of Sciences, Grant No. XDA0703010

Gas-Solids Hydrodynamics in a CFB with 6 Cyclones and a Pang Leg

Solids volume fraction and particle velocity profiles were measured with a fiber optical probe in a cold circulating fluidized bed test rig with 6 parallel cyclones and a pant leg. Results in the pant leg zone, main bed zone and exit zone of the furnace are reported. The work also includes the influences of superficial gas velocity, secondary air rate and static bed height on the gas-solids hydrodynamics

Experiments and DFT study on modified CaO-based adsorbents for enhanced CO2_{{2}} capture

CaO-based adsorbents for carbon capture represent a promising technology for reducing carbon emission. In this study, we prepare metal oxide-doped multifarious CaO-based adsorbents using the hydration method. We investigate the effect of various working conditions, such as temperature and carbonation time, on different adsorbents in a fixed-bed reactor under multiple carbonation–calcination cycles. We examine the behavior of different metal oxides-doped synthetic adsorbents using density functional theory calculation based on experiments. The results prove that 5 wt% ZrO2-doped adsorbents show excellent CO2 adsorption efficiency, which reaches up to 38.4% after 20 carbonation–calcination cycles at 700 °C with 15 vol% CO2. The adsorbents doped with other metal oxides are also useful for CO2 capture to varying degrees. The adsorption energy of CO2 molecules on modifiequationed adsorbents is higher than that on pure CaO, especially for Zr, where the adsorption energy reached 2.37 eV. The calculation results are in good agreement with the experimental data

Experiments and DFT study on modified CaO-based adsorbents for enhanced CO2_{{2}} capture

CaO-based adsorbents for carbon capture represent a promising technology for reducing carbon emission. In this study, we prepare metal oxide-doped multifarious CaO-based adsorbents using the hydration method. We investigate the effect of various working conditions, such as temperature and carbonation time, on different adsorbents in a fixed-bed reactor under multiple carbonation–calcination cycles. We examine the behavior of different metal oxides-doped synthetic adsorbents using density functional theory calculation based on experiments. The results prove that 5 wt% ZrO2-doped adsorbents show excellent CO2 adsorption efficiency, which reaches up to 38.4% after 20 carbonation–calcination cycles at 700 °C with 15 vol% CO2. The adsorbents doped with other metal oxides are also useful for CO2 capture to varying degrees. The adsorption energy of CO2 molecules on modifiequationed adsorbents is higher than that on pure CaO, especially for Zr, where the adsorption energy reached 2.37 eV. The calculation results are in good agreement with the experimental data

Variations in growth traits and wood physicochemical properties among Pinus koraiensis families in Northeast China

This study aimed to explore and improve the different economic values of Pinus koraiensis (Siebold and Zucc.) by examining the variations in 6 growth traits and 9 physicochemical wood properties among 53 P. koraiensis half-sib families. Growth traits assessed included height, diameter at breast height, volume, degree of stem straightness, stem form, and branch number per node, while wood properties assessed included density, fiber length and width, fiber length to width ratio, and cellulose, hemicellulose, holocellulose, lignin, and ash contents. Except for degree of stem straightness and branch number per node, all other traits exhibited highly significant variations (P < 0.01) among families. The coefficients of variation ranged from 5.3 (stem form) to 66.7% (ash content), whereas, the heritability ranged from 0.136 (degree of stem straightness) to 0.962 (ash content). Significant correlations were observed among growth traits and wood physicochemical properties. Principal component analysis identified four distinct groups representing growth traits, wood chemical and physical properties, and stem form traits. Multi-trait comprehensive evaluation identified three groups of elite families based on breeding objectives, including rapid growth, improved timber production for building and furniture materials, and pulpwood production. These specific families should be used to establish new plantations

Preparation of calcium oxide by decomposition of phosphogypsum under CO and water vapor atmosphere

Phosphogypsum (PG) is an industrial solid waste, and the production of CaO by CO reduction of PG can not only solve the environmental problems caused by PG, but also turn waste into treasure to generate CaO. However, the current yield of CaO production by CO reduction of PG is low. To further improve the yield of CaO, a technical method of CaO preparation by CO-H2O synergistic reduction of PG is proposed. The impacts of CO concentration, P(H2O)/P(CO) ratio and reaction temperature are examined in this work together with FactSage thermodynamic simulations in order to determine the ideal reaction conditions and reaction mechanism. It is found that the CaO yield could reach 96.78% at 1100 °C of 3% CO and P(H2O)/P(CO) of 10. The mechanism study shows that when the CO atmosphere contains H2O, the reductive decomposition of PG by CO is actually the result of the joint action of CO, H2 and CO2. Overall, this research will help to enhance a novel technological strategy for preparing CaO by decomposition of PG

Perception and Behavioral Intention of Cycling Space on Urban Greenway

To explore the spatial power and spatial relationship of urban greenway sports cultural memory, using literature data induction analysis method, questionnaire survey method, interview method, and other research methods, the connotation of urban greenway sports cultural memory is analyzed, and the urban greenway sports are explained. Using Lefebvre’s ternary dialectics to study the production process of Guangzhou greenway’s sports cultural memory space, its spatial practice is in the interpretation of Guangzhou’s Greenway sports cultural memory. The government is the leading force in the memory of greenway sports culture. It is a necessary prerequisite for the cultural memory of greenway sports, and the public is the main body of the cultural memory of greenway sports. The spatial representation is in the context of the cultural memory of greenway sports, sorting out the hard memory and soft memory in the memory field of Guangzhou Greenway Sports Culture. The representational space is the sports cultural memory space experienced by the greenway activists, space directly “lived” by the greenway activists, and the internalization of the cognition, experience, and spatial representation of the sport’s cultural memory of the greenway activists