Suchergebnisse

At present, the allowed outage time (AOT) of an M310 unit emergency diesel generator (EDG) was 3 days, which can be extended to 14 days through replacement of additional diesel units; although it provides a certain online maintenance time, it cannot meet the needs of ten-years overhauls. In order to avoid stopping the reactor for maintenance of NPP due to insufficient of EDG AOT, based on risk-informed method analysis feasibility of extending AOT for EDG to 28 days, we quantitatively calculate the impact of extension of AOT on risk level of nuclear power plants (NPPs). Analysis shows that extension of EDG AOT to 28 days has less impact on NPPs, and safety of NPPs can be further ensured through temporary risk control measures, so the extension of AOT to 28 days is acceptable. By using risk-informed technology to extend AOT for EDG, unnecessary shutdown and maintenance is avoided and the economy of NPPs and flexibility of maintenance work arrangement is greatly improved while ensuring safety, which is of great significance to operation and maintenance of NPPs.

"This paper deals with the interaction of sodium dioctylsulfosuccinate (AOT) and methyl red (MR) by UV-Vis spectrophotometry at 298.15 K. The concentration of AOT varies from 0 to 0.12530 mol/kg and the concentration of methyl red is 3.71×10-5 M. Here, water concentration is defined by the R parameter. The R parameter in this study varied from 0 to 20. Two intense absorption bands were observed within the 380 to 540 nm wavelength of methyl red in methanol. Band 1(380 to 450 nm) of methyl red contains a higher absorbance peak than band 2(450 to 540 nm). When the concentration of AOT increased, band 1(380 - 450 nm) of methyl red decreased the absorbance peak, whereas band 2 (450 to 540 nm) of methyl red increased the absorbance peak with increasing AOT concentration. Band 1 shows a hypochromic shift of methyl red with an increase in AOT concentration, whereas band 2 shows a hyperchromic shift of methyl red with an increase in AOT concentration. On comparing the absorbance versus concentration graph for different R parameters, we observed that absorbance increases with the increase in the R parameter. The binding constant and distribution constant were calculated using a non-linear regression procedure (NLREG). The experiment shows the effect of methanol, AOT and water concentration on methyl red."

High-spatiotemporal-resolution PM2.5 data are critical to assessing the impacts of prolonged exposure to PM2.5 on human health, especially for urban areas. Satellite-derived aerosol optical thickness (AOT) is highly correlated to ground-level PM2.5, providing an effective way to reveal spatiotemporal variations of PM2.5 across urban landscapes. In this paper, Multi-Angle Implementation of Atmospheric Correction (MAIAC) AOT and ground-based PM2.5 measurements were fused to estimate daily ground-level PM2.5 concentrations in Beijing for 2013&ndash ; 2017 at 1 km resolution through a linear mixed effect model (LMEM). The results showed a good agreement between the estimated and measured PM2.5 and effectively revealed the characteristics of its spatiotemporal variations across Beijing: (1) the PM2.5 level is higher in the central and southern areas, while it is lower in the northern and northwestern areas ; (2) the PM2.5 level is higher in autumn and winter, while it is lower in spring and summer. Moreover, annual PM2.5 concentrations decreased by 24.03% for the whole of Beijing and 31.46% for the downtown area from 2013 to 2017. The PM2.5 data products we generated can be used to assess the long-term impacts of PM2.5 on human health and support relevant government policy decision-making, and the methodology can be applied to other heavily polluted urban areas.

Assisted Outpatient Treatment (AOT) is a court-mandated program intended to engage adults with serious mental illness who have challenges with voluntary treatment adherence. AOT programs are designed to promote outpatient treatment participation, reduce emergency care, and decrease justice involvement. Research has found AOT programs to be effective in reducing hospitalizations and justice involvement. Yet, concerns have been raised, including limiting individual autonomy and self-determination and overrepresentation of individuals from BIPOC backgrounds. This article describes the evolution the AOT Houston Model. Through applying the social work lens, this innovative model builds on AOT strengths and addresses limitations. The Houston AOT Model has five goals guided by the core tenets of client empowerment and self-determination. This Model prioritizes six elements including housing, employment, access to public benefits, transportation, service continuity, and care coordination/communication. Implications for practice and policy are presented with strategies for successful implementation of comprehensive AOT programs in other jurisdictions.

Monitoring particulate matter with aerodynamic diameters of less than 2.5 &mu ; m (PM2.5) is of great importance to assess its adverse effects on human health, especially densely populated regions. In this paper, an improved linear mixed effect model (LMEM) was developed. The model introduced meteorological variable, column water vapor (CWV), which has as the same resolution as satellite-derived aerosol optical thickness (AOT), to enhance PM2.5 estimation accuracy by considering spatiotemporal consistency of CWV and AOT. The model was implemented to urban agglomeration of Chengdu Plain during 2015. The results show that model accuracy has been improved significantly compared to linear regression model (R2 = 0.49), with R2 of 0.81 and root mean squared prediction error (RMSPE) of 15.47 &mu ; g/m3, mean prediction error (MPE) of 11.09 &mu ; g/m3, and effectively revealed the characteristics of spatiotemporal variations PM2.5 level across the study area: The PM2.5 level is higher in the central and southern areas with dense population, while it is lower in the northwest and southwest mountain areas ; and the PM2.5 level is higher during autumn and winter, while it is lower during spring and summer. The product data in this paper are valuable for local government pollution monitoring, public health research, and urban air quality control.

The AFWERX Open Topic (AOT) program uses funding from the United States Air Force's (USAF) Small Business Innovation and Research (SBIR) budget to adapt commercial technology to USAF needs. The AOT approach to small business investment is markedly different from that of legacy SBIR investment methods. This research is a comparison of processes and outcomes for AOT and legacy SBIR. The first axis of comparison is on commercialization rates. Applying a legacy definition of commercialization on a sample of AOT contracts, we found AOT's commercialization to be 37% (compared to an 8.8% for legacy SBIR). We caveat this finding by pointing out the ways a commercialization comparison of the two SBIR methods might be appropriate. The next comparison considered the military capabilities each process invested in. AOT contracts were binned into Joint Capability Areas (JCA) to create an AOT military capability portfolio (MCP) which was then compared to a legacy SBIR MCP. Results suggest legacy SBIR invests at higher rates in the Force Application JCA while AOT investment rates are higher in the Force Integration and Command & Control JCAs. The final comparison considers the success of AFWERX's strategy of creating technical centers (or 'front doors') in regions known for being bastions of innovation (i.e., AFWERX Austin) by a simple test of differences between AOT and legacy regional SBIR participation rates. In Texas and Washington District of Columbia (DC), regions with AFWERX centers, AOT participation rates were statistically higher than legacy SBIR.