三江平原典型环型湿地不同埋藏深度枯落物的热值研究

本文研究了埋藏在不同深度的3种典型湿地植物枯落物的热值在一个生长季内的变化特征,并初步探讨了其影响因素。研究表明小叶章和漂筏苔草枯落物热值呈现相同的变化特征:0-10cm、10-20cm、20-30cm三个层次两种植物的枯落物热值随着分解的进行,逐渐下降。30-40cm层次热值呈现波状起伏。而毛果苔草枯落物热值的变化起伏大,规律特征不明显

Compression Strength and Deformation Behaviour of Methane Hydrate Specimen

Methane hydrates, which form at low temperature and high pressure, are found in ocean sediments and being evaluated as a potential fuel for the future. The worldwide total of methane hydrate is estimated to be equivalent to 250 trillion cubic meters of methane gas. In order to establish an efficient production technology for extraction of methane from hydrates, deformation and movement behaviour of ocean sediments have to be basically clarified. The aim of this study is to develop the low temperature auto-controlled triaxial compression apparatus and to estimate the mechanical properties by using the ice rock matrix specimen. The preliminary results on relationships between deformation properties, shear strength and sand content in the specimen are presented and discussed

Expert consensus on the management of dermatogenic chronic pruritus in children

瘙痒见于多种疾病,在儿童多由皮肤疾病导致,即皮肤源性瘙痒.持续存在的慢性瘙痒治疗困难,可对患儿的睡眠、情绪、认知、学校表现及社会家庭功能等方面产生负面影响,严重影响患儿及其家庭成员的生活质量.临床上迫切需要对儿童慢性瘙痒进行规范化管理,而目前国内外缺乏独立的儿童慢性瘙痒诊疗指南或共识.该共识根据循证医学证据及专家意见,制定了一套针对0～18岁儿童皮肤源性慢性瘙痒的管理方案,供临床医生参考.</p

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements