Developing a Construction Safety Standard System to Enhance Safety Supervision Efficiency in China: A Theoretical Simulation of the Evolutionary Game Process

Labor safety is one of the most fundamental indicators to improve contractors’ sustainability. Safety supervision plays a crucial role in affecting the safety performance of infrastructure projects. However, studies of standards development to enhance safety supervision efficiency are far from complete. Safety standards define safe behaviors for construction workers and hazard control processes in the workplace, and they are usually considered as an important part of safety control. In addition, the systematic reform of construction safety standards in China provides an innovative perspective to enhance safety supervision efficiency by linking standards to supervision. For this purpose, this paper proposes the concept and framework of the “Construction Safety Standard System (CSSS)” through expert interviews. CSSS hierarchically classifies safety standards and integrates similar standards. Its implementation will significantly influence the behavioral decisions of safety supervision stakeholders. Evolutionary game (EG) theory is applied to demonstrate the decision-making procedure in CSSS establishment and application. Furthermore, system dynamics (SD) is utilized to model and analyze equilibrium states under different supervision strategies. Meanwhile, case studies are implemented to assess the CSSS’s effectiveness in reality. The numerical results indicate that through CSSS implementation, the strategy choice fluctuation of supervisors and contractors is suppressed and a more desirable stable equilibrium is reached. The government tends to supervise and contractors tend to obey safety standards consciously. The findings reveal that CSSS can enhance safety supervision efficiency and have meaningful implications for theoretical study on safety supervision and construction safety management practice.

The Remediation Strategy and Mechanism of Combined Passivation and Foliar Inhibition for Safe Rice Production in Red Paddy Soil Contaminated With Heavy Metals

To solve the problem of Cd in rice over the food-safe standard, the present field study was carried out to explore the combined passivators (a mixture of quicklime (Q), polyacrylamide (A), sepiolite (S)) and Si-/Se- containing foliar inhibitors (Si or Se) at low (1) and high (2) application rates were added into the red paddy soil. After harvest the rice, the soil samples were collected to examine the soil properties, bacterial community, and the availability of heavy metals (Cd, Pb, and Cu) in soil. The rice samples were obtained to investigate the accumulation of heavy metals by rice. All of the treatments increased the soil's pH, but the treatments excluding QSe2 decreased the total P and soil organic matter (SOM), which was favourable for the immobilisation of heavy metals in red paddy soil by decreasing 14.29%-42.86% of available Cd, 10.18%-63.17% of available Pb, and 6.95%-36.81% of available Cu. With the increasing application rates, QAS significantly decreased the heavy metals available because of the enhanced immobilisation, while QSi and QSe significantly increased the heavy metals available because of the inhibited plant uptake. After remediation, QA1, QSi2, and QSe2 most effectively decreased the uptake Cd by rice in the present red paddy soil to solve the problem of Cd exceeding the threshold value according to the National Food Safety Standard of China (GB2762-2017). Additionally, the treatments, with the exception of Q1, QA1, QSi1, and QSi2, did not dramatically change the community structure of bacteria at the genus level in soil. Considering the safety and stability of soil, QSe2 was the primary recommendation for remediating Cd-contaminated red paddy soil.

Pelatihan perawatan/service AC untuk masyarakat sekitar Politeknik Penerbangan Indonesia Curug

The trend of using air conditioners, air conditioners or called AC (Air Conditioner) is increasing in the community both in offices and in housing. To keep its performance, air conditioning should be maintained regularly according to the intensity procedure. Hence, the air conditioner can stabilize the air temperature and humidity of the area in accordance with its specification. As the demand for maintenance is growing, the opportunity to become an AC technician is also increasing. Carrying out basic training in AC maintenance can assist people who are interested to become AC technicians. Training participants are expected to gain knowledge of AC installation, AC components and working principles, AC maintenance, and safety standard.

Evaluation of the Relationship among Biogenic Amines, Nitrite and Microbial Diversity in Fermented Mustard

Biogenic amines (BAs) and nitrites are both considered harmful compounds for customer health, and are closely correlated with the microorganisms in fermented mustard (FM). In this study, BAs and nitrite contents in fifteen FM samples from different brands were analyzed. The concentrations of cadaverine in one sample and of histamine in one sample were above the toxic level. Moreover, five FM samples contained a high level of nitrite, exceeding the maximum residue limit (20 mg/kg) suggested by the National Food Safety Standard. Then, this study investigated bacterial and fungal communities by high-throughput sequencing analysis. Firmicutes and Basidiomycota were identified as the major bacteria and fungi phylum, respectively. The correlations among microorganisms, BAs and nitrite were analyzed. Typtamine showed a positive correlation with Lactobacillus and Pseudomonas. Cadaverine and nitrite is positively correlated with Leuconostoc. Furthermore, thirteen strains were selected from the samples to evaluate the accumulation and degradation properties of their BAs and nitrite. The results indicated that the Lactobacillus isolates, including L. plantarum GZ-2 and L. brevis SC-2, can significantly reduce BAs and nitrite in FM model experiments. This study not only assessed the contents of BAs and nitrite in FM samples, but also provided potential starter cultures for BAs and nitrite control in the FM products industry.