山楂总黄酮的超声波辅助提取及抗氧化性能研究

以山楂为原料,通过单因素试验和正交试验设计优化了山楂总黄酮的超声波辅助提取工艺条件,并通过清除羟自由基(·OH)和超氧阴离子自由基(O-2·),评价山楂总黄酮的体外抗氧化性能。结果表明,乙醇体积分数和超声浸提温度对山楂总黄酮提取率具有显著性影响,山楂总黄酮超声波辅助提取的最佳工艺条件是:乙醇体积分数60%,超声浸提温度50℃,浸提时间60 min,料液比1∶60(g∶mL),提取率为7.61%。山楂总黄酮对·OH和O-2·均具有一定的清除作用,在相同浓度下,山楂总黄酮对·OH的清除效果与维生素C相当,对O-2·的清除效果低于维生素C。     

Design of the high voltage isolation transmission module with low delay for ECRH system on J-TEXT

As a flexible auxiliary heating method,the electron cyclotron resonance heating(ECRH) has been widely used in many tokamaks and also will be applied for the J-TEXT tokamak.To meet requirements of protection and fault analysis for the ECRH system on J-TEXT,signals of gyrotrons such as the cathode voltage and current,the anode voltage and current,etc should be transmitted to the control and data acquisition system.Considering the high voltage environment of gyrotrons,isolation transmission module based on FPGA and optical fiber communication has been designed and tested.The test results indicate that the designed module has strong anti-noise ability,low error rate and high transmission speed.The delay of the module is no more than 5 μs which can fulfill the requirements.     

地方高校化学试剂信息化管理的探讨

地方高校化学试剂具有种类多、数量少、分布广、购置频繁的特点。通过分析目前化学试剂常规管理中存在的问题,提出了化学试剂的模块化管理模式,根据化学试剂管理的整个流程设计各种功能模块,模块之间互相衔接,可以达到对化学试剂的全过程动态管理,便于及时查阅需求状况,大大提高了工作效率,减少了重复采购,节约了成本,为化学试剂的科学管理和合理采购提供依据。     

电煤中含矸率的测定与检测方法监控

本文主要阐述了电煤中的含矸率及其测定方法、煤中矸石对电力生产的危害、制定含矸率电力行业标准并提出检测方法等问题。     

自燃离子液体:潜在的绿色双组元推进剂燃料

自燃离子液体是一种潜在的绿色双组元液体推进剂燃料。简要介绍了自燃离子液体的概念及其结构与性能关系的研究进展。     

Study of a 105 GHz short-pulse dummy load for the electron cyclotron resonance heating system with the quasi-optical method

The accurate power measurement is important for an ECRH system in tokamak. The dummy load is designed and developed for the measurement of the millimeter wave power. This work analyzes the dummy load based on the quasi-optical method and the ray tracing method. The reflectivity and thermal deposition of the dummy load have been considered to ensure the safety of the entire system. High-power tests have been carried out at a 105 GHz/500 kW ECRH system. The results of the tests indicate that the designed dummy load is stable and valid.     

Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system

Power measurement is necessary for an electron cyclotron resonance heating (ECRH) system. The directional coupler method has been put forward to monitor high-power microwave from gyrotrons in real time. A multi-hole directional coupler has been designed and manufactured for the 105 GHz/500 kW ECRH system on the J-TEXT tokamak. During the design process, we established the relationships between hole parameters and coupling characteristics based on the multi-hole coupling method and small-hole coupling theory. High-power tests have been carried out. The results indicated the reasonability of the theoretical design and practicality of the fabricated directional coupler. Sources of test errors have been discussed in detail, and the influences of spurious modes on the directional couplers have been emphatically analyzed.     

新工科背景下“检测技术”教学模式改革

针对传统“检测技术”课程教学知识模块化导致学生在学习中习惯被动接受，难以领悟知识发现过程中的科学思想和价值追求的问题。本文提出了混合式教学模式的指导思想，对本课程进行了以解决工程问题为学习主线的课堂讲授和以实际工程问题为背景的测量系统设计专题研讨的混合式教学模式的构建。经过2019年和2021年的实施和改进，该教学模式激发了学生的学习兴趣，提升了综合应用能力和创新意识。     

Recent progress of the ECRH system and initial experimental results on the J-TEXT tokamak

In order to broaden the range of the plasma parameters and provide experimental conditions for physical research into high-performance plasma, the development of the electron cyclotron resonance heating (ECRH) system for the J-TEXT tokamak was initiated in 2017. For the first stage, the ECRH system operated successfully with one 105 GHz/500 kW/1 s gyrotron in 2019. More than 400 kW electron cyclotron (EC) wave power has been injected into the plasma successfully, raising the core electron temperature to 1.5 keV. In 2022, another 105 GHz/500 kW/1 s gyrotron completed commissioning tests which signifies that the ECRH system could generate an EC wave power of 1 MW in total. Under the support of the ECRH system, various physical experiments have been carried out on J-TEXT. The electron thermal transport in ECRH plasmas has been investigated. When ECRH is turned on, the electron thermal diffusivity significantly increases. The runaway current is elevated when a disruption occurs during ECRH heating. When the injected EC wave power is 400 kW, the conversion efficiency of runaway current increases from 35% to 75%. Fast electron behavior is observed in electron cyclotron current drive (ECCD) plasma by the fast electron bremsstrahlung diagnostic (FEB). The increase in the FEB intensity implies that ECCD could generate fast electrons. A successful startup with a 200 kW ECW is achieved. With the upgrade of the ECRH system, the J-TEXT operational range could be expanded and further relevant research could be conducted.