抑霜型空气源热泵机组应用实测研究

空气源热泵结霜过程会恶化机组的实际运行性能，重霜工况下尤为严重，发展抑霜型空气源热泵是保障其高效适用和良性发展的关键。本文依托四川省康定市的某住宅示范工程，开展抑霜型空气源热泵和常规型空气源热泵的现场实测研究，研究抑霜型空气源热泵实际应用中的抑霜、制热性能表现，并进行技术经济性分析。结果表明：抑霜型空气源热泵抑霜效果显著，制热性能得到显著改善，能效提升达到21%~37.3%，费用年值比常规空气源热泵降低了13%，1年左右即可回收追加的投资，具有更好的技术经济性，有助于空气源热泵技术在严重结霜气候区域的高效应用。     

A novel 4D resolution imaging method for low and medium atomic number objects at the centimeter scale by coincidence detection technique of cosmic-ray muon and its secondary particles

The muon radiography imaging technique for high-atomic-number objects(Z) and large-volume objects via muon transmission imaging and muon multiple scattering imaging remains a popular topic in the field of radiation detection imaging. However, few imaging studies have been reported on low and medium Z objects at the centimeter scale. This paper presents an imaging system that consists of three layers of a position-sensitive detector and four plastic scintillation detectors. It acquires data by co...     

Comparison between fluctuation of floating potential gradient and velocity of blob structure on HL-2A tokamak

Several results based on the Langmuir probes' data on the HL-2A tokamak are presented. The blob structures' radial and poloidal drift velocities, estimated by the gradient of floating potential and by time delay evaluation, are compared in different line-averaged density and electron cyclotron resonance heating conditions. A positive correlation is observed in the comparison between blobs' radial velocity estimated by the two methods mentioned above, regardless of the situation differences mentioned above. Correlation is also observed in the comparison between the blobs' poloidal velocity estimated by the two methods in different situations, while a shift due to the different line-averaged density is observed. These results imply that the radial gradient of floating potential may have some value as a reference during data analysis in low-parameter discharge.     

Optical design of the Lyman alpha based beam emission spectroscopy(LAB)diagnostic on the HL-2A tokamak

In this article, we present the optical design of a novel diagnostic on the HL-2 A tokamak, i.e. the20-channel edge Lyman-alpha beam emission spectroscopy, which is a promising solution for edge density turbulence research on tokamaks, as it offers the possibility of density fluctuation measurement with a 3.3 mm spatial resolution while maintains a high temporal resolution of1 μs. The optical path, including the reflective collection optics, the high-dispersion spectrometer, and the linear detector array, is carefully optimized to obtain a good image quality and a high throughput. The maximum root mean square radius of the collection optics is 64 μm.The detected photon flux is estimated to be about 10~(11) photons/s/channel.     

核子秤在配料控制系统中的应用

核子称在环境恶劣的工业配料系统中具有广泛应用。以丹东飞利达DFD-900核子秤配料控制系统在河南豫光金铅股份有限公司8万t直接炼铅技改扩建项目中的应用为例,详细阐述了核子秤配料控制系统的理论基础、结构部件和工作原理。在使用该系统后,不仅有效提高了工业原料配置的效率,而且实现了清洁化作业环境,具有长期稳定性可靠性高,维护量很小,维修成本极低的优点,应用效果为国产核子秤在配料控制系统更深入的发展提供了借鉴。     

过山蕨化学成分及其抗血栓闭塞性脉管炎药理活性的研究进展

对过山蕨化学成分及其抗血栓闭塞性脉管炎活性进行归纳整理,期待能为阐明其治疗血栓闭塞性脉管炎的药效物质基础及作用机制提供依据。     

深海环境下浮力材料的力学性能研究

浮力材料凭借其优异的机械性能和低密度,在深海装备、航空航天及生活用品中的应用越来越广泛。将空心玻璃微珠填充环氧树脂基体中采用模压的方法制备了三种密度浮力材料,对产品全方位静水压(12.5MPa)作用后的力学性能、尺寸稳定性、吸水率等进行了测试。结果表明,浮力材料经过全方位静水压作用后,压缩性能基本没有变化,剪切强度保留率在95%以上,拉伸强度和冲击强度都有所提高,尺寸稳定性好,吸水率随着静水压作用时间的延长先快速升高后趋于稳定。     

LNG汽车发动机稳压器用钢的热处理及性能优化

采用不同的正火温度和时间对LNG汽车发动机稳压器用16Mn D5钢进行了热处理,并进行了耐磨损性能和冲击性能测试。结果表明:随正火温度从850℃升高至970℃(正火时间50 min)或正火时间从30 min增加至70 min(正火温度940℃),试样的室温耐磨损性能、高温耐磨损性能和冲击性能均呈现先提高后下降的变化趋势。LNG汽车发动机稳压器用钢的最佳热处理工艺参数为:940℃正火温度和50 min正火时间。