Long-Term Variation Assessment of Aerosol Load and Dominant Types over Asia for Air Quality Studies Using Multi-Sources Aerosol Datasets

Long-term (2000–2019) assessment of aerosol loads and dominant aerosol types at spatiotemporal scales using multi-source datasets can provide a strong impetus to the investigation of aerosol loads and to the targeted prevention control of atmospheric pollution in densely populated regions with frequent anthropogenic activities and heavy aerosol emissions. This study uses multi-source aerosol datasets, including Modern-Era Retrospective Analysis for Research and Applications version 2 (MERRA-2), Moderate Resolution Imaging Spectroradiometer (MODIS), and Aerosol Robotic Network (AERONET), to conduct a long-term variation assessment of aerosol load, high aerosol load frequency, and dominant aerosol types over Asia. The results indicate that regional aerosol type information with adequate spatial resolution can be combined with aerosol optical depth (AOD) values and heavy aerosol load frequency characterization results to explore the key contributors to air pollution. During the study period, the aerosol load over the North China Plain, Central China, Yangtze River Delta, Red River Delta, Sichuan Basin, and Pearl River Delta exhibited an increasing trend from 2000–2009 due to a sharp rise in aerosol emissions with economic development and a declining trend from 2010–2019 under stricter energy conservation controls and emissions reductions. The growth of urban/industrial (UI) type and biomass burning (BB) type aerosol emissions hindered the improvement of the atmospheric environment. Therefore, in future pollution mitigation efforts, focus should be on the control of UI-type and BB-type aerosol emissions. The Indus–Ganges River Plain, Deccan Plateau, and Eastern Ghats show a continuously increasing trend; however, the aerosol load growth rate of the last decade was lower than that of the first decade, which was mainly due to the decrease in the proportion of the mixed type aerosols.

Fusarium species associated with root rot of lentil (Lens culinaris L.) in North Dakota

Root rot of lentils is caused by a pathogen complex which includes several Fusarium species as well as Aphanomyces euteiches, Rhizoctonia solani and Pythium species. Surveys of lentil fields were conducted in 2016 and 2018 in North Dakota to identify Fusarium species associated with root rot. Isolations were performed from lentil roots exhibiting disease and isolates were identified via morphology and sequencing. In total, 114 fields were surveyed and 391 Fusarium isolates were collected. A diversity of Fusarium species was recovered as ten species were represented; however, F. oxysporum was the most frequently isolated species, present in 71% of fields where Fusarium root rot was detected. Based on correlation with disease severity data, it is likely that some of these isolates are pathogenic. F. avenaceum was relatively uncommon, unlike previous survey efforts on field pea in North Dakota. Further research is needed to determine how the Fusarium population responsible for root rot of lentil may be affected by cropping practices or seasonal climatic variation. Assessment of the virulence and host range of Fusarium species associated with root rot of lentil will further enhance our understanding of the root rot complex in lentil and the development and integration of effective management practices.

Facial expressions of Asian people exposed to constructed urban forests: Accuracy validation and variation assessment

An outcome of building sustainable urban forests is that people’s well-being is improved when they are exposed to trees. Facial expressions directly represents one’s inner emotions, and can be used to assess real-time perception. The emergence and change in the facial expressions of forest visitors are an implicit process. As such, the reserved character of Asians requires an instrument rating to accurately recognize expressions. In this study, a dataset was established with 2,886 randomly photographed faces from visitors at a constructed urban forest park and at a promenade during summertime in Shenyang City, Northeast China. Six experts were invited to choose 160 photos in total with 20 images representing one of eight typical expressions: angry, contempt, disgusted, happy, neutral, sad, scared, and surprised. The FireFACE ver. 3.0 software was used to test hit-ratio validation as an accuracy measurement (ac.) to match machine-recognized photos with those identified by experts. According to the Kruskal-Wallis test on the difference from averaged scores in 20 recently published papers, contempt (ac. = 0.40%, P = 0.0038) and scared (ac. = 25.23%, P = 0.0018) expressions do not pass the validation test. Both happy and sad expression scores were higher in forests than in promenades, but there were no difference in net positive response (happy minus sad) between locations. Men had a higher happy score but lower disgusted score in forests than in promenades. Men also had a higher angry score in forests. We conclude that FireFACE can be used for analyzing facial expressions in Asian people within urban forests. Women are encouraged to visit urban forests rather than promenades to elicit more positive emotions.

Variation assessment of yield mode at pressure welding

There are offered ratios for the computation of deformation and power modes of yielding at billet pressure welding. A power method is used for the computation of pressure with reference to a flat discontinuous field of movement speeds. Pressure minimization is carried out in a variation way. The assessment of billet material damageability is shown.

Assessment in Spanish heritage language programs

Spanish heritage language learners (HLLs) are heterogeneous in nature. Thus, how can we assess these students? Most of the literature on this has been on placement exams (Polinsky & Kagan, 2017, among others), but the focus of this article is on assessment in Spanish heritage courses. Placement test results should be indicators of what should be included in the curriculum. One of the main challenges is the lack of the following components: specific proficiency indicators for HLLs, consensus in defining key concepts, understanding dialect variation, assessment for measuring linguistic skills, and finally research on HLLs’ assessment (Malone, Kreeft Peyton, & Kim, 2014). Thus, assessment is the biggest challenge in HL education due to the dominant monolingual ideologies, so formative assessment practices are recommended to confront them by allowing HLLs to negotiate their linguistic identities via multilingual perspectives (King, Liu, & Schwedhelm, 2018). What are specific tools or activities to negotiate these? Personal narratives of US Latinos were collected by Carreira and Beeman (2014) for the sake of reflections of HLLs as language brokers. González-Davies (2004, 2018) also mentions the importance of peer-to-peer strategies for translation competence. These projects can also become group projects, like the manifestos implemented by Moreno and MacGregor-Mendoza (2019) in a course in which language, culture, and community are the goals. All these activities are examples of the kinds of assessment that may be effective in the heritage classroom and may guide their instructors. The goal of this article is to suggest activities to connect HLLs with their communities at the same time that their learning gains are assessed in terms of language proficiency.

Influence of Manufacturing Variation On the Dynamic and Tribological Performance of Tilting Pad Journal Bearings

A systematic approach of a Tilting Pad Journal Bearing (TPJB) as a whole tolerance stack up assembly is presented. Normal component variation within actual design tolerances is considered. The vector loop is expanded via Taylor series for sensitive analysis. The bearing shell and tilting pad machined radiuses for each pad are found to be the more influential dimensional characteristics on the assembled clearance and preload. A leading edge relief was used to avoid unloaded pads fluttering, while maintaining a satisfactory bearing assembled clearance in the loaded pads throughout the resultant preload variation. Pivot flexibility and preload loss due to pad wear in service life were considered in the preload variation assessment. Surface response multivariate multi-response models were built for a 4-pad TPJB under Load Between Pad (LBP) and Load On Pad (LOP) configurations. Desirability functions rendered the maximum and minimum rotordynamic coefficient and tribological parameter responses across speed. The LOP configuration showed more variation in the direct rotordynamic coefficients, while the LBP configuration indicated more sensitive cross-coupled coefficients with strong sign change in some cases. Among the tribological performance parameters, the eccentricity and pad maximum pressure were more affected, followed by the minimum film thickness, and weakly by the power loss, and oil film temperature. The dispersion of the tribology parameters under normal manufacturing variation is found of importance. Four, and seven extreme geometrical state cases were identified for the LBP, and LOP bearing configurations, respectively.