Journal of Value Management

Study on Influence Factors of Suspended Solids Concentration Change in East Lake of Wuhan before and after Rainfall Events Based on GWR Model

GAN Wen-xia, PAN Jun-jie, XIAO An-na, YANG Ru-qin — Fri, 27 Dec 2024 09:07:22 +0800

The research combines remote sensing technology and geostatistical spatial analysis technology to quantitatively analyze the impact of different factors such as social, economic and infrastructure factors on the concentration of suspended solids in urban lakes. Through remote sensing data, the suspended solids concentration of East Lake in Wuhan before and after the rainfall from January 20 to January 28, 2021 was quantitatively retrieved, and the spatial characteristics of the suspended solids concentration change before and after the event and the impact of different factors on the suspended solids concentration change were analyzed by using geographical weighted regression. The analysis results show that the building area, the number of intersections and the road area are positively correlated with the concentration of suspended solids. The area of forest and green space is negatively correlated with the concentration of suspended solids in the water edge area. This research can provide theoretical support for urban environmental management and precise pollution prevention and control.

Research on risk response mechanism of supply chain interrupt in lean production enterprises under COVID-19

Zhanfu Zhang, Liyan Geng — Fri, 27 Dec 2024 09:18:44 +0800

Lean production, as a production mode of continuous improvement, takes simplification as the core of improvement. The implementation of a series of epidemic prevention and control policies after the outbreak of COVID-19 has a major impact on lean production enterprises who are faced with the risk of supply chain disruption. On the basis of summarizing the operation characteristics of lean production mode, this paper analyzed the impact of COVID-19 on the supply chain of lean production enterprises from two aspects, that is, challenges and opportunities. Then, the paper put forward a coping mechanism to prevent supply chain disruption. The results show that in terms of challenges, the implementation of epidemic prevention and control policies has led to difficulties in resumption of work and production, challenges to timely supply and cost control, reduced customized demand and difficult commodity sales. In terms of opportunities, COVID-19 can promote the optimization and integration of the selection of employees and suppliers in lean production, promote the industrial upgrading of lean production enterprises, and enhance the risk management ability of supply chain managers. In order to effectively prevent supply chain interruption, lean production enterprises should start from the three dimensions of prior prevention, in-process control and post improvement of supply chain risk management, strengthn the coordination and cooperation of all links of the supply chain of lean production enterprises, and jointly resist the occurrence of supply chain interruption risk.

Comprehensive assessment of China's water resources security based on AHP-CRITIC and research on influencing factors

Ziqin Guo — Fri, 27 Dec 2024 09:24:49 +0800

In order to understand the level of China's water security, this paper selects 18 indicators from the aspects of natural endowment, economy, society and ecological environment to construct China's water resources security evaluation system. Firstly, the evaluation of China's water resource security from 2005 to 2020 shows that China's water resources were in a relatively dangerous state from 2005 to 2011, and the obstacles affecting water resource security were low economic development level and low natural endowment of water resources. After 2011, the level of water security gradually improved, and the transition to a relatively safe state was changed to a relatively safe state, and the obstacles at this stage were the level of social development and ecological environment. Secondly, the ARIMA (0, 1, 4) model is used to predict China's water security level from 2021 to 2025, and the results show that China's water security score increases year by year from 2021 to 2025. Finally, reasonable policy suggestions are put forward to further improve the level of China's water resources security.

Foundation pit digging effect evaluation of combined pollution soil remediation in adjacent sites

Hengcui Huo — Fri, 27 Dec 2024 09:28:12 +0800

There are two adjacent chemical pollution sites, belonging to the first andsecond land use plan, containing 16 contaminated areas. The pollutants are hexavalent chromium and benzo [a] pyrene. The contaminated soil is excavated simultaneously and group by group, remedied respectively in offsite plant. Based on the research, a set of sampling scheme is designed which is suitable for the foundation pit digging effect evaluation of multiple combined pollution foundation pitswith different land use plan and restoration target values. The results show that the evaluation of foundation pit digging effect of the two sites isup to standard, and the schemes of first excavation and expanding excavation are feasible. Scientific and accurate evaluation of foundation pit digging effect is conducive to reducing the risk of human health in the late management and utilization of the site.

Troubleshooting of Siemens Drives in Engineering Applications

Jin Ma — Fri, 27 Dec 2024 09:30:10 +0800

This article describes some of the main alarms and faults generated by Siemens MASTERDRIVES 6SE70 series drives in engineering project applications and the handling process for these faults and alarms.