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不同粒径厌氧颗粒污泥产气作用对沉降性能的影响

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中国给水排水 2024年第5期40卷 82-86页

作者：曹宇浩管锡珺陈计洋夏丽佳青岛理工大学环境与市政工程学院山东青岛266033

取粒径为0.3~0.5、0.5~1、1~1.5、1.5~2、>2 mm的厌氧颗粒污泥(记作R1~R5),测定孔隙率和产甲烷活性,计算其在不同粒径下的理论沉降速度,并与其在清水柱和营养柱中的实际沉降速度进行对比。结果表明,孔隙率与颗粒粒径呈正相关,适当的孔... 详细信息

取粒径为0.3~0.5、0.5~1、1~1.5、1.5~2、>2 mm的厌氧颗粒污泥(记作R1~R5),测定孔隙率和产甲烷活性,计算其在不同粒径下的理论沉降速度,并与其在清水柱和营养柱中的实际沉降速度进行对比。结果表明,孔隙率与颗粒粒径呈正相关,适当的孔隙率有利于颗粒污泥沉降,而过大的孔隙率会影响污泥密度,降低沉降性能。粒径为1.5~2 mm的颗粒污泥产甲烷活性最强,污泥产气会导致气泡黏附在污泥表面,从而降低沉降速度。中间粒径颗粒污泥(R3、R4)的沉降速度受产气作用的影响最大,其中R4颗粒污泥在营养柱与清水柱中的速度沉降差值最大达到-27 m/h。

关键词：厌氧颗粒污泥粒径沉降速度孔隙率产甲烷活性

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面向线束预装配的多约束线束布局方法研究

图学学报 2024年第1期45卷 139-147页

作者：罗月童彭俊高景一罗睿明陈绩周波合肥工业大学计算机与信息学院安徽合肥230601

线束由一组线束段按树状结构连接而成,是飞机汽车等产品中连接各电气设备的接线部件。为提高安装效率,复杂线束需要在线束工装板图上进行预安装,即根据角度、距离、交叉、边界等工艺约束在工装板上摆放线束,是一个多约束下的线束布局问... 详细信息

线束由一组线束段按树状结构连接而成,是飞机汽车等产品中连接各电气设备的接线部件。为提高安装效率,复杂线束需要在线束工装板图上进行预安装,即根据角度、距离、交叉、边界等工艺约束在工装板上摆放线束,是一个多约束下的线束布局问题。通过借鉴图布局算法,将线束布局转换为优化问题,并采用随机梯度下降法SGD每次随机挑选一对线束段进行优化,逐步迭代收敛。因为线束段是长度不变的刚体,所以移动一根线束段时会带动相连的其他线束段,进而导致SGD迭代过程出现震荡,难以收敛。通过提出双向传递的线束段移动算法,在保证线束段能移动到目标位置的同时尽量少相连线束段的变动。使用合成线束案例和某真实飞机线束案例进行有效性验证,结果表明各工艺约束能均能得到满足,符合线束预装配的生产要求。

关键词：线束布局图布局随机梯度下降多约束预装配

Whole-genome sequencing opens a new era for molecular breeding of grass carp(Ctenopharyngodon idellus)

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Science China(Life Sciences) 2015年第6期58卷 619-620页

作者： HU Wei chen ji State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences

Recently, the genome sequencing of the grass carp （Cte- nopharyngodon idellus） has been jointly completed by re- searchers from Institute of Hydrobiology （Chinese Academy of Sciences）, National Center for Gene Research, and Sun Yat-Sen University. Adopting a whole-genome shotgun sequencing strategy and modified de novo Phusionmeta assembly pipeline, researchers obtained a 0.9 GB draft genome of a female adult grass carp and a 1.07 GB genome of a wild male.

关键词：全基因组测序草鱼分子育种中国科学院中山大学生物研究所鸟枪法测序基因组草图

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特应性皮炎生物靶向治疗研究发展

中国临床药理学杂志 2024年第5期40卷 768-772页

作者：刘盈姚采君曾晖陈季芳周春广州新华学院药学院广东广州510520 南方医科大学药学院广东广州510515

特应性皮炎(AD)是最常见的慢性炎症性皮肤病,几十年来,AD的治疗仅限于局部皮质类固醇、局部钙调神经磷酸酶抑制剂,对于中重度AD患者,则仅限于光疗和全身免疫抑制剂。随着AD发病机制地深入研究,许多局部和全身靶向治疗药物正在研发中,可... 详细信息

特应性皮炎(AD)是最常见的慢性炎症性皮肤病,几十年来,AD的治疗仅限于局部皮质类固醇、局部钙调神经磷酸酶抑制剂,对于中重度AD患者,则仅限于光疗和全身免疫抑制剂。随着AD发病机制地深入研究,许多局部和全身靶向治疗药物正在研发中,可能会改变AD的治疗选择。本文结合目前最新的临床试验对AD生物靶向治疗的种类、机制、疗效和安全性研究作一综述,为AD个体化治疗提供一定的理论依据。

关键词：特应性皮炎生物制剂靶向治疗临床试验

Numerical simulation of humping phenomenon in high speed gas metal arc welding

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Frontiers of Materials Science 2011年第2期5卷 90-97页

作者： ji chen Chuan-Song WU State Key Lab of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China Institute of Materials Joining Shandong University Jinan 250061 China

It is of great significance to obtain a thorough understanding of the physical mechanisms responsible for humping bead phenomenon in high speed gas metal arc welding （GMAW） in order to raise welding efficiency. Experiments were conducted to observe the weld pool behaviors in high speed GMAW, and it was found that both the severely deformed weld pool surface and strong backward flowing play a dominant role in humping bead formation. In this study, a mathematical model is developed to quantitatively analyze the forming mechanism of humping beads for high speed GMAW through considering both the momentum and heat content distribution of the backward flowing molten metal inside the weld pool. The transient development of temperature profiles in the weld pool with severe deformation demonstrates the humping bead forming process under some welding conditions. The predicted and measured humping bead dimensions are in agreement.

关键词： numerical simulation humping weld bead high-speed GMAW

Dosimetric risk factors for radiation esophagitis in patients with breast cancer following regional nodal radiation

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World Journal of Clinical Cases 2024年第17期12卷 2995-3003页

作者： Mei-chen ji Zhi-jia Li Ke Li Yun-Xiao Wang Bo Yang Lin-Lin Lv Ying Su Zhi-Wei Zhang Zhong-Chao Huo Qing Qi Yong-Chang Lu Zhi-Qiang Cui Yan-Bao Liu Oncology Center The Affiliated Hospital of Hebei University of EngineeringHandan 056002Hebei ProvinceChina General Surgery Department Handan First HospitalHandan 056002Hebei ProvinceChina Department of Breast Surgery The Affiliated Hospital of Hebei University of EngineeringHandan 056002Hebei ProvinceChina School of Clinical Medicine Hebei University of EngineeringHandan 056002Hebei ProvinceChina

BACKGROUND Radiation esophagitis(RE)is one of the most common clinical symptoms of regional lymph node radiotherapy for breast ***,there are fewer studies focusing on RE caused by hypofractionated radiotherapy(HFRT).AIM To analyze the clinical and dosimetric factors that contribute to the development of RE in patients with breast cancer treated with HFRT of regional lymph *** Between January and December 2022,we retrospectively analysed 64 patients with breast cancer who met our inclusion criteria underwent regional nodal intensity-modulated radiotherapy at a radiotherapy dose of 43.5 Gy/*** Of the 64 patients in this study,24(37.5%)did not develop RE,29(45.3%)developed grade 1 RE(G1RE),11(17.2%)developed grade 2 RE(G2RE),and none developed grade 3 RE or *** univariable logistic regression analysis found G2RE to be significantly correlated with the maximum dose,mean dose,relative volume 20-40,and absolute volume(AV)*** stepwise linear regression analyses found AV30 and AV35 to be significantly associated with G2RE(P<0.001).The optimal threshold for AV30 was 2.39 mL[area under the curve(AUC):0.996;sensitivity:90.9%;specificity:91.1%].The optimal threshold for AV35 was 0.71 mL(AUC:0.932;sensitivity:90.9%;specificity:83.9%).CONCLUSION AV30 and AV35 were significantly associated with *** thresholds for AV30 and AV35 should be limited to 2.39 mL and 0.71 mL,respectively.

关键词： Breast cancer Dosimetric parameters Radiation esophagitis Esophagitis Hypofractionated radiotherapy

A study of short-period variation in solar activity

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Research in Astronomy and Astrophysics 2014年第8期14卷 1011-1018页

作者： ji-Long chen Juan Zhao Department of Astronomy Beijing Normal University

We introduce two methods to detect short-period variation in solar activity. These are called amplitude of low frequency fluctuation （ALFF） and fractional am- plitude of low frequency fluctuation （FALFF）. We find a positive correlation between short-period variation and 11-year variation of solar activity using these two methods. Through ALFF, we find that solar activity over a short period becomes intensive when the 11-year solar activity is intensive. The ALFF value of the short period activity varies with the peak in sunspot number as a quadratic function. Through FALFF we find that the ratio of short-period spectral intensity to intensity over the whole period of solar activity will increase when the 11-year period of solar activity is intensive. The short-period FALFF value varies with the peak in sunspot number according to a cubic function. Using ALFF, we obtain a yearly series of solar activity that varies over a short period of 1-5 yr from 1860 to 2003, which shows an obvious periodicity of about 22 yr, 33 yr, 11 yr and a century. These short period variations show good correlations with long term variations in solar activity.

关键词： Sun activity -- Sun sunspots -- methods data analysis

葛藤花HPLC指纹图谱建立及3种成分含量测定

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中成药 2024年第8期46卷 2511-2516页

作者：王计瑞陈继建代金鑫杨锡金蒋燕青魏江平阳勇张小梅重庆市中药研究院国家中医药管理局中药化学三级实验室重庆400065 重庆医科大学中医药学院重庆401331 遵义医科大学药学院贵州遵义563000 重庆上药慧远药业有限公司重庆401331

目的建立葛藤花HPLC指纹图谱,并测定染料木苷、鸢尾苷、染料木素的含量。方法分析采用AQ-C_(18)色谱柱(250 mm×4.6 mm,5μm);流动相乙腈-0.1%磷酸,梯度洗脱;体积流量1.0 mL/min;柱温30℃;检测波长260 nm。再进行聚类分析和主成分分析... 详细信息

目的建立葛藤花HPLC指纹图谱,并测定染料木苷、鸢尾苷、染料木素的含量。方法分析采用AQ-C_(18)色谱柱(250 mm×4.6 mm,5μm);流动相乙腈-0.1%磷酸,梯度洗脱;体积流量1.0 mL/min;柱温30℃;检测波长260 nm。再进行聚类分析和主成分分析。结果10批药材指纹图谱中有17个共有峰,相似度大于0.970。3种成分在各自范围内线性关系良好(r>0.9990),平均加样回收率100.50%~104.30%,RSD 1.93%~5.21%。各批药材聚为2类,3种主成分累积方差贡献率为84.822%。结论该方法稳定可靠,可用于葛藤花的质量控制。

关键词：葛藤花 HPLC指纹图谱染料木苷鸢尾苷染料木素含量测定聚类分析主成分分析

Morphology, crystal structure and hydration of calcined and modified anhydrite

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International Journal of Minerals,Metallurgy and Materials 2014年第10期21卷 1028-1032页

作者： Xiao-qing Niu ji-chun chen School of Urban Construction Huazhong University of Science and Technology Wuchang Branch

The effects of calcination and modification on the morphology （shapes and textures） and crystal structure of anhydrite powders were studied. The results show that, calcination at 100℃ causes anhydrite to disintegrate into smaller crystals, accompanied by a slight in- crease in d-spacing. Without calcination and modification, the solidification time and curing time of anhydrite are 15 and 77 h, respectively. After the treatment, however, the solidification time and curing time are shortened significantly to 9.5 and 14 rain, respectively. The com- pressive and flexural strengths of hydration products made from the treated anhydrite reach 10.2 and 2.0 MPa, respectively. The much shorter solidification and curing time make it possible to use anhydrite as a building and construction material.

关键词： anhydrite morphology crystal structure curing hydration calcination modification