Energy Consumption, Carbon Emissions and Global Warming Potential of Wolfberry Production in Jingtai Oasis, Gansu Province, China

During the last decade, China's agro-food production has increased rapidly and been accompanied by the challenge of increasing greenhouse gas (GHG) emissions and other environmental pollutants from fertilizers, pesticides, and intensive energy use. Understanding the energy use and environmental impacts of crop production will help identify environmentally damaging hotspots of agro-production, allowing environmental impacts to be assessed and crop management strategies optimized. Conventional farming has been widely employed in wolfberry (Lycium barbarum) cultivation in China, which is an important cash tree crop not only for the rural economy but also from an ecological standpoint. Energy use and global warming potential (GWP) were investigated in a wolfberry production system in the Yellow River irrigated Jingtai region of Gansu. In total, 52 household farms were randomly selected to conduct the investigation using questionnaires. Total energy input and output were 321,800.73 and 166,888.80 MJ ha−1, respectively, in the production system. The highest share of energy inputs was found to be electricity consumption for lifting irrigation water, accounting for 68.52%, followed by chemical fertilizer application (11.37%). Energy use efficiency was 0.52 when considering both fruit and pruned wood. Nonrenewable energy use (88.52%) was far larger than the renewable energy input. The share of GWP of different inputs were 64.52% electricity, 27.72% nitrogen (N) fertilizer, 5.07% phosphate, 2.32% diesel, and 0.37% potassium, respectively. The highest share was related to electricity consumption for irrigation, followed by N fertilizer use. Total GWP in the wolfberry planting system was 26,018.64 kg CO2 eq ha−1 and the share of CO2, N2O, and CH4 were 99.47%, 0.48%, and negligible respectively with CO2 being dominant. Pathways for reducing energy use and GHG emission mitigation include: conversion to low carbon farming to establish a sustainable and cleaner production system with options of raising water use efficiency by adopting a seasonal gradient water pricing system and advanced irrigation techniques; reducing synthetic fertilizer use; and policy support: smallholder farmland transfer (concentration) for scale production, credit (small- and low-interest credit) and tax breaks

The incorporation of fixed cost and multilevel capacities into the discrete and continuous single source capacitated facility location problem

In this study we investigate the single source location problem with the presence of several possible capacities and the opening (fixed) cost of a facility that is depended on the capacity used and the area where the facility is located. Mathematical models of the problem for both the discrete and the continuous cases using the Rectilinear and Euclidean distances are produced. Our aim is to find the optimal number of open facilities, their corresponding locations, and their respective capacities alongside the assignment of the customers to the open facilities in order to minimise the total fixed and transportation costs. For relatively large problems, two solution methods are proposed namely an iterative matheuristic approach and VNS-based matheuristic technique. Dataset from the literature is adapted to assess our proposed methods. To assess the performance of the proposed solution methods, the exact method is first applied to small size instances where optimal solutions can be identified or lower and upper bounds can be recorded. Results obtained by the proposed solution methods are also reported for the larger instances

Learning Medical Pharmacology through Role-Playing Method

Background and Objective: Traditional methods of medical education, despite being easy to implement, do not have long-lasting efficiency. The main aim of this study is to use the help of the learners to teach parts of the medical pharmacology course using role-playing pedagogy. This was done for the first time in Babol University of Medical Sciences with the cooperation of medical students who entered the university in 2016. Methods: Students were divided into 5 groups and a group leader was introduced for each group. Five topics were selected and corresponding scenarios were written. There were three to seven people in each group. The physician together with the hypothetical resident or student examined the patient's problems and prescribed medicine and gave them the necessary recommendations. All participants were given a pre-test and a post-test, and then the findings were statistically analyzed. Findings: 101 students (49 girls and 52 boys) with a mean age of 21.43±1.14 years participated in the study. Except for the topic of poisoning, the mean difference in pre- and post-test scores of female students was lower than that of male students. For example, this difference was observed in the topic of Parkinsonism (p<0.0001). All students involved in the performance obtained better grades in the same topics compared to other students (88.15 vs. 59.71 out of 100). 74% of female students and 79% of male students expressed satisfaction with the implementation of this method. Conclusion: According to the findings, this method has increased the motivation to learn the medical pharmacology course and stabilize the course topics. Therefore, its implementation in difficult courses with diverse and voluminous content not only helps them to learn better, but also helps them maintain their enthusiasm and increase motivation to learn more and consolidate what they have learned