2 results about "Carbon Dioxide / Helium" patented technology

This invention discloses a method for extending the storage time of peaches, a composite plasma-activated water system, and a preservation system, belonging to the field of post-harvest preservation of fruits and vegetables. The method uses a quaternary gas mixture of argon, oxygen, carbon dioxide, and helium to prepare plasma-activated water through discharge. A specific ratio of tea polyphenols and chitosan is then added to obtain composite plasma-activated water. Combined with gentle pre-cooling, light-protected ultrasonic atomization spraying, and modified atmosphere buffering, this achieves a synergistic effect of antibacterial activity, water retention, antioxidant properties, and flavor preservation. This method can reduce the total bacterial count, rot rate, and weight loss rate of peaches during storage, maintain fruit firmness, enhance the activity of endogenous antioxidant enzymes, reduce malondialdehyde accumulation, and effectively retain soluble solids and titratable acids, among other flavor compounds. The process of this invention is green and mild, with no chemical residues, and can delay flesh softening and peel browning, thus extending the storage time and shelf life of peaches.

This invention belongs to the field of tunnel construction safety monitoring technology, and provides a shield tunnel gas environment monitoring system and method based on dynamic decoupling and multi-source fusion. It acquires parameters of life-sustaining gases, toxic and harmful gases, flammable and explosive gases, and physical environment parameters within the tunnel. The acquired data is preprocessed; a pre-set cross-interference coefficient matrix is ​​corrected using temperature data; matrix decoupling is performed on the toxic and harmful gas parameter data to obtain the true gas concentration values; based on the correlation characteristics between humidity and particulate matter concentration, water mist interference is identified, and weighted compensation is applied to parameter data acquired by optical sensors; a tunnel safety index is calculated; and based on the tunnel safety index value and the gas concentration change rate, a pre-set decision tree control logic is matched to trigger corresponding levels of audible and visual alarms and equipment linkage. This invention can realize tunnel construction safety monitoring.