Subjects: Nuclear Science and Technology >> Nuclear Instrument and Meter submitted time 2023-09-06
Keliang Liao
Xu Zheng
Zhao Li
Zhipeng Xue
Guangzhi Yin
Xinmin Zhang
Xiaolong Li
Yueliang Gu
Peiping Zhu
Abstract： Background : Two x-ray diffractometers produced by HUBER company have been installed at BL02U2 of Shanghai Synchrotron Radiation Facility (SSRF). Purpose : In order to further meet the needs of users for grazing incidence diffraction experimental methods, a new grazing incidence diffractometer was installed between the two HUBER diffractometers. Methods : This paper mainly introduces the overall scheme of the grazing incidence diffractometer, and discusses in detail several important modules such as high-precision, high-load and large-stroke linear stage, three-dimensional adjustment platform for detector, sample stage system, and the control system. Results : The compatible operation of three diffractometers was realized, and the typical experimental result of the grazing incidence diffractometer with MoS2 sample was introduced as an example. Conclusions : The grazing incidence x-ray diffractometer developed has been operated more than two years, and expands the experimental platform for material surface science research at SSRF.
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Geography submitted time 2022-01-26 Cooperative journals: 《干旱区研究》
Abstract：盐生植物灌溉周期合理制定是对提高干旱区水资源利用效率的关键因素。以食叶草（Rumex hanus by.）细根（d1 mm）为研究对象，采用干旱-复水方法，测定复水后不同时间食叶草细根总根长、根尖数、平均根直径，研究根系增长率、死亡量、根寿命和周转率的变化特征，为制定最佳灌溉周期提供参考依据。结果表明：根长和根尖数在复水后7 d增长幅度最大，10~15 d增长幅度减弱。细根增长率（RER）在复水后第4 d达到最大，第10 d出现显著下降（P），在不同土层（0~20 cm和20~40 cm）和根系直径（0~0.5 mm和0.5~1.0 mm）之间均有极显著差异（P）。细根净生产量（NRP）与RER二者均呈现先增长后降低的规律。复水后15 d，0~20 cm土层和20~40 cm土层的细根存活率分别为3.6%和16.9%，0.5~1.0 mm直径的细根存活率高于0~0.5 mm细根。研究表明复水后细根中位寿命在8.09~13.83 d，20~40 cm土层细根寿命显著高于0~20 cm土层（P）。食叶草细根通过增加20~40 cm土层中0.5~1.0 mm细根应对和适应干旱及复水，从而达到生存目的。综合考虑食叶草生长和农业水资源供给情况，在夏季盐碱地食叶草最佳灌溉周期为10 d。
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2020-04-26 Cooperative journals: 《干旱区研究》
Abstract：合理利用无法耕种而荒弃盐碱地对于解决我国耕地紧缺具有重要意义，食叶草是一种耐盐碱草本作物，研究食叶草生长发育可为盐碱地的开发利用提供新的改良措施。通过田间试验，设置垄上和平作两种栽培模式，利用微管法动态监测食叶草根系生长动态变化，研究垄上种植模式对盐碱地食叶草生物量、根长、根体积、平均根直径、根尖数和叶形态变化的影响。结果表明：① 垄作和平作根系生长均呈现近似对数特征。② 一年生食叶草垄上种植模式根长为2 217.9 cm，较平作增加10.47%；平均根直径为2.41 mm，较平作增加5.63%；根体积为101.18 cm3，较平作增加34.69%；食叶草产量为0.803 kg·m-2，较平作增加20%。③ 与平作种植模式相比，垄上栽培能够促进食叶草地下根系发育和叶片生长，提高食叶草产量。
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