<b><span style="font-family:Verdana;">Introduction</span></b><span style="font-family:Verdana;">: According to the National Health and Nutrition Survey, the Mexican ho...<b><span style="font-family:Verdana;">Introduction</span></b><span style="font-family:Verdana;">: According to the National Health and Nutrition Survey, the Mexican households in 2018 had food insecurity at 55.5% while in 2012 it was 70%. Food insecurity is a global health problem and now with the COVID-19 pandemic</span><span style="font-family:Verdana;">,</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> it has increased. </span><b><span style="font-family:Verdana;">Objective</span></b><span style="font-family:Verdana;">: To compare the levels of food and nutritional insecurity in women’s households from two Social Impulse Centers of</span><span><span style="font-family:Verdana;"> the Secretary for Human Social Development (SEDESHU) before and during the COVID-19 pandemic. </span><b><span style="font-family:Verdana;">Methods</span></b><span style="font-family:Verdana;">: A comparative a</span></span><span style="font-family:Verdana;">nd cross-sectional study was carried out in 41 women participating in a nutritional intervention program in two social promotion centers. Food security was measured with the Latin American and Caribbean Food Security Scale (ELCSA), comparing it in a period from January to April 2020: before and during the health contingency. Socio-economic and demographic variables were also measured, as well as access to water during the COVID-19 pandemic. </span><b><span style="font-family:Verdana;">Results</span></b><span style="font-family:Verdana;">: Food insecurity levels during the COVID-19 contingency were found to have increased by more than 60% (from 31.7% to 93%);the main risk factors associated with unemployment and access to healthy food. The COVID-19 contingency reflects impacts on households, but because women participated in the nutritional intervention program, it could influence by observing that, at least, the use of food was adequate since apparently food waste was minimal. </span><b><span style="font-family:Verdana;">Conclusio</span><span style="font-family:Verdana;">n</span></b></span><b><span style="font-family:Verdana;">s</span></b><span style="font-family:Verdana;">: The implementation of an educational nutrition program can be a strateg</span><span style="font-family:Verdana;">y in the face of contingencies or extraordinary situations. In this way, the negative impact could be less in the population that does not have any type of food education.</span>展开更多
以Pro/E w ildfire2.0为开发平台,以圆锥齿轮为研究对象,利用关系式约束的空间曲线,以旋转、扫描混合及镜像、阵列等方法创建圆锥齿轮实体。并以Pro/Program模块为开发工具,进行圆锥齿轮的三维参数化造型程序设计,用户根据人机交互界面...以Pro/E w ildfire2.0为开发平台,以圆锥齿轮为研究对象,利用关系式约束的空间曲线,以旋转、扫描混合及镜像、阵列等方法创建圆锥齿轮实体。并以Pro/Program模块为开发工具,进行圆锥齿轮的三维参数化造型程序设计,用户根据人机交互界面的提示,输入相关参数,即可自动生成圆锥齿轮的三维实体,从而缩短产品的开发周期,提高设计效率。展开更多
In this paper, a numerical method based on a coupling between a mathematical model of nonlinear transient ship manoeuvring motion in the horizontal plane and Mathematical Programming （MP） techniques is proposed. The...In this paper, a numerical method based on a coupling between a mathematical model of nonlinear transient ship manoeuvring motion in the horizontal plane and Mathematical Programming （MP） techniques is proposed. The aim of the proposed procedure is an efficient estimation of optimal ship hydrodynamic parameters in a dynamic model at the early design stage. The proposed procedure has been validated through turning circle and zigzag manoeuvres based on experimental data of sea trials of the 190 000- dwt oil tanker. Comparisons between experimental and computed data show a good agreement of overall tendency in manoeuvring traiectories.展开更多
文摘<b><span style="font-family:Verdana;">Introduction</span></b><span style="font-family:Verdana;">: According to the National Health and Nutrition Survey, the Mexican households in 2018 had food insecurity at 55.5% while in 2012 it was 70%. Food insecurity is a global health problem and now with the COVID-19 pandemic</span><span style="font-family:Verdana;">,</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> it has increased. </span><b><span style="font-family:Verdana;">Objective</span></b><span style="font-family:Verdana;">: To compare the levels of food and nutritional insecurity in women’s households from two Social Impulse Centers of</span><span><span style="font-family:Verdana;"> the Secretary for Human Social Development (SEDESHU) before and during the COVID-19 pandemic. </span><b><span style="font-family:Verdana;">Methods</span></b><span style="font-family:Verdana;">: A comparative a</span></span><span style="font-family:Verdana;">nd cross-sectional study was carried out in 41 women participating in a nutritional intervention program in two social promotion centers. Food security was measured with the Latin American and Caribbean Food Security Scale (ELCSA), comparing it in a period from January to April 2020: before and during the health contingency. Socio-economic and demographic variables were also measured, as well as access to water during the COVID-19 pandemic. </span><b><span style="font-family:Verdana;">Results</span></b><span style="font-family:Verdana;">: Food insecurity levels during the COVID-19 contingency were found to have increased by more than 60% (from 31.7% to 93%);the main risk factors associated with unemployment and access to healthy food. The COVID-19 contingency reflects impacts on households, but because women participated in the nutritional intervention program, it could influence by observing that, at least, the use of food was adequate since apparently food waste was minimal. </span><b><span style="font-family:Verdana;">Conclusio</span><span style="font-family:Verdana;">n</span></b></span><b><span style="font-family:Verdana;">s</span></b><span style="font-family:Verdana;">: The implementation of an educational nutrition program can be a strateg</span><span style="font-family:Verdana;">y in the face of contingencies or extraordinary situations. In this way, the negative impact could be less in the population that does not have any type of food education.</span>
文摘以Pro/E w ildfire2.0为开发平台,以圆锥齿轮为研究对象,利用关系式约束的空间曲线,以旋转、扫描混合及镜像、阵列等方法创建圆锥齿轮实体。并以Pro/Program模块为开发工具,进行圆锥齿轮的三维参数化造型程序设计,用户根据人机交互界面的提示,输入相关参数,即可自动生成圆锥齿轮的三维实体,从而缩短产品的开发周期,提高设计效率。
文摘In this paper, a numerical method based on a coupling between a mathematical model of nonlinear transient ship manoeuvring motion in the horizontal plane and Mathematical Programming （MP） techniques is proposed. The aim of the proposed procedure is an efficient estimation of optimal ship hydrodynamic parameters in a dynamic model at the early design stage. The proposed procedure has been validated through turning circle and zigzag manoeuvres based on experimental data of sea trials of the 190 000- dwt oil tanker. Comparisons between experimental and computed data show a good agreement of overall tendency in manoeuvring traiectories.
