Combination of heat treatment and chitosan coating to improve postharvest quality of wolfberry (Lycium barbarum)

The synergistic application of hot water dip at 42 °C for 30 min and 1% chitosan coating on differentiation in postharvest quality traits, microstructure as well as microbiological evolution of wolfberry fruits was investigated. Fresh wolfberry fruits were stored at 2 ± 0.5 °C and 90% relative humidity (RH) for 28 days. Results indicated the combination of prestorage heat treatment and chitosan coating maintained higher levels of ascorbic acid, total phenolic contents and antioxidant capacity as well as lower decay, compared with untreated wolfberry fruits. The possible mechanism was that the heat treatment almost sealed open stomata to limit the sites of pathogen penetration into fruits independently, followed by the biofilm formed by chitosan which controlled secondary infections as well as slowed changes in fruit respiration and metabolic activity in wolfberries. The synergistically treated fruit also exhibited a higher acceptability obtained by sensory analysis after cold storage. In this sense, the integrated application of heat treatment and chitosan coating could be regarded as an effective strategy to extend storage life and maintain the postharvest quality of wolfberry fruits.     

Flotation Behavior,Collector Adsorption Mechanism of Quartz and Feldspar-Quartz Systems Using PEA as a Novel Green Collector

Silicon - A novel green cationic surfactant Poly (propylene glycol) bis (2-aminopropyl ether) (PEA) with multiple amine groups was utilized as a collector for flotation separation of quartz from...     

A dual-mode bandpass filter with enhanced capacitive perturbation

A dual-mode ring bandpass filter with two pairs of capacitors has been designed. The capacitors are used to control the location of the even- and odd-mode frequencies independently, allowing weak coupling for narrow-band filter design with realizable capacitance values. Theoretical expressions have been derived for these frequencies. A 4% bandwidth bandpass filter centered at 1.9 GHz was designed and tested with good agreement between theoretical and measured results.     

Laminated Reservoir Fracturing Technique

IntroductionOil production from laminated reservoirs is significant in Daqing Oilfield in the high water cut period. Hydraulic fracturing is a very efficient way to stimulate these laminated reservoirs. Daqing Oilfield is a multi-zone sandstone     

双相位编码在数据通信中的应用

双相位码是数据串行通信和记录中使用的一种编码方法。在集散控制系统中使用的磁带机和飞行数据记录器中得到广泛应用。本文主要介绍双相位码的编码、译码原理及双相位码的特点;重点论述双相位码的编码和译码过程在微机上的实现。工程实践和实验表明,用微机实现双相位码的编码和译码过程是切实可行的。试用在TDC-2000集散控制系统中获得了圆满成功。     

气相起爆系统现场应用试验研究

在现场试验的基础上,对气相起爆系统的实际应用性能进行了初步研究.分析和探讨了该系统安全使用条件和尚存在的诸多技术问题.此外,还介绍了我国首批研制成功的气相雷管及其性能.     

谈画鱼技法

中华民族自古至今，历来把鱼看做吉祥，富裕的标志，每逢生日、婚宴、尤其是大年三十晚人们欢度春节的喜庆日子里，千家万户欢聚的团圆餐桌上，品味佳肴不尽相同，但是每户桌上不可以少了鱼这道菜。因为人们通常把鱼象征着宝贵，吉祥，意味着丰收的果实取之不尽，年年有余，吉庆有余，同时表达人们对美好生活的追求，和来年欣欣向荣的景象。这就不难理解，在中国几千年的人类文化历史长河中，一代又一代的艺术画师精心构画出的杰作，以画寓意，姿态各异，色彩缤纷，无不反映了人们热爱生活的情趣，成为人们美好的精神享受。因此画好了一幅鱼画，使其能成为成功的作品。展示在人们的面前，任其细细品味观摩，使之有身临大自然的意境去感受到艺术的内涵，激发起喜悦的情怀，浮想出对生活美好的憧憬，要做到这一步的确不是一件易事，这需要作者在长期的艺术实践中，不断摸索，勤学苦练，着重形象生动，动中取神，逐步做到鱼在脑中，鱼在心中，而后才通过技艺使鱼画在纸上，画在瓷上。     

文控室管理

在信息时代,信息化管理的作用非常重大。首先从信息化的定义认识信息化管理,并阐述了菲林信息化管理的必要性。接着从文控室确保资料的唯一性的具体做法及好处谈论菲林信息化管理的必要性。