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Low Surface Brightness Galaxies Selected by Different Model Fitting

Research in Astronomy and Astrophysics 2024年第1期24卷 223-236页

作者： Bing-Qing Zhang Hong Wu Wei Du pin-Song zhao Min He Feng-Jie Lei Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

We present a study of low surface brightness galaxies(LSBGs) selected by fitting the images for all the galaxies inα.40 SDSS DR7 sample with two kinds of single-component models and two kinds of two-component models(disk+bulge):single exponential,single sersic,exponential+deVaucular(exp+deV),and exponential+sérsic(exp+ser).Under the criteria of the B band disk central surface brightness μ_(0,disk)(B)≥22.5 mag arcsec^(-2) and the axis ratio b/a> 0.3,we selected four none-edge-on LSBG samples from each of the models which contain 1105,1038,207,and 75 galaxies,respectively.There are 756 galaxies in common between LSBGs selected by exponential and sersic models,corresponding to 68.42% of LSBGs selected by the exponential model and 72.83% of LSBGs selected by the sersic model,the rest of the discrepancy is due to the difference in obtaining μ_(0) between the exponential and sersic models.Based on the fitting,in the range of 0.5≤n≤1.5,the relation of μ_(0) from two models can be written as μ_(0,sérsic)-μ_(0,exp)=-1.34(n-1).The LSBGs selected by disk+bulge models(LSBG_(2)comps) are more massive than LSBGs selected by single-component models(LSBG_1comp),and also show a larger disk component.Though the bulges in the majority of our LSBG_(2)comps are not prominent,more than 60% of our LSBG_(2)comps will not be selected if we adopt a single-component model only.We also identified 31 giant low surface brightness galaxies(gLSBGs) from LSBG_(2)comps.They are located at the same region in the color-magnitude diagram as other gLSBGs.After we compared different criteria of gLSBGs selection,we find that for gas-rich LSBGs,M_(*)> 10^(10)M_⊙ is the best to distinguish between gLSBGs and normal LSBGs with bulge.

关键词： catalogs galaxies:spiral galaxies:bulges methods:data analysis methods:statistical

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Photocatalytic thin film composite forward osmosis membrane for mitigating organic fouling in active layer facing draw solution mode

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Chinese Chemical Letters 2023年第6期34卷 230-235页

作者： Yang Hu pin zhao Hao Liu Xiawen Yi Weilong Song Xinhua Wang Jiangsu Key Laboratory of Anaerobic Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

As a high-flux operation mode of thin film composite-forward osmosis(TFC-FO)membrane,active layer facing draw solution(AL-DS)mode suffers from the severe membrane fouling tendency,which is not addressed well.Here,we introduced a photocatalyst(Anatase titanium dioxide,A-TiO_(2))onto the support layer of TFC-FO membrane via the bonding of polydopamine(PDA)and polytetrafluoroethylene(PTFE),and prepared two photocatalytic membranes,A-TiO_(2)/PDA@TFC and A-TiO_(2)/PTFE@TFC.Compared with the pristine TFC-FO membrane,both A-Ti O_(2)/PDA@TFC and A-TiO_(2)/PTFE@TFC had an improved water permeability(10.5 L m^(-2)h^(-1)and 9.5 L m^(-2)h^(-1),respectively)and reduced reverse Na Cl flux salt(0.8 g m^(-2)h^(-1)and 0.7 g m^(-2)h^(-1),respectively)in the AL-DS mode using 1 mol/L Na Cl as draw solution and pure water as feed solution.Moreover,in the 16 h fouling experiment using 200 ppm bovine serum albumin(BSA)solution as a representative pollutant,the flux decline rate of both photocatalytic membranes was dramatically alleviated from 39.7%and 21.7%in the darkness to 8.5%and 9.7%under UV irradiation,respectively,indicating a significant anti-fouling capacity of photocatalytic effect.In all,the presence of A-TiO_(2)endowed membrane with high permeability,high rejection efficiency and excellent anti-fouling capacity under UV spotlight.As bonding agent,PTFE provided the modified membrane with a high photocatalytic effect and high self-cleaning capacity,while PDA increased the membrane permeability and protected membrane against photocatalytic damage.This work provides a simple and feasible method to improve the anti-fouling capacity of TFC-FO membrane in AL-DS mode.

关键词： Forward osmosis Photocatalysis Membrane orientation Membrane fouling Water permeation

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Preparation of electrically enhanced forward osmosis(FO)membrane by two-dimensional MXenes for organic fouling mitigation

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Chinese Chemical Letters 2022年第8期33卷 3818-3822页

作者： Mengsi Xu pin zhao Chuyang Y.Tang Xiawen Yi Xinhua Wang Jiangsu Key Laboratory of Anaerobic Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China Department of Civil Engineering The University of Hong KongHong KongChina Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 214122China

In this work,a conductive thin film composite forward osmosis(TFC-FO)membrane was firstly prepared via vacuum filtering MXenes nanolayer on the outer surface of polyethersulfone membrane followed by interfacial polymerization in the other side.Moreover,its feasibility of mitigating organic fouling under electric field was evaluated.Results indicated that the addition of MXenes greatly reduced the electric resistance of membrane from 2.1×10^(12)Ωto 46.8Ω,enhanced the membrane porosity and promoted the membrane performance in terms of the ratio of water flux to reverse salt flux.The modified TFC-FO membrane presented the optimal performance with 0.47 g/m^(2)loading amount of MXenes.Organic fouling experiments using sodium alginate(SA)and bovine serum albumin(BSA)as representative demonstrated that the introduction of MXenes could effectively enhance the anti-fouling ability of TFC-FO membrane under the electric field of 2 V.The interelectron repulsion hindered organic foulants attaching into membrane surface and thus effectively alleviated the membrane fouling.More importantly,the modified TFC-FO membrane showed good stability during the fouling experiment of 10 h.In all,our work proved that introducing MXenes into the porous layer of support is feasible to alleviate organic fouling of FO membrane.

关键词： Forward osmosis Conductive membrane MXenes Organic fouling Antifouling property

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节段拼装变截面波形钢腹板连续组合箱梁的剪切性能试验研究

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湖南大学学报（自然科学版） 2024年第3期51卷 170-181页

作者：赵品邵旭东荣学亮刘鑫道路与铁道工程安全保障省部共建教育部重点实验室(石家庄铁道大学) 河北石家庄050043 石家庄铁道大学土木工程学院河北石家庄050043 湖南大学土木工程学院湖南长沙410082 河北自贸区汉曹铁路有限公司河北唐山063200

为了研究节段预制拼装波形钢腹板连续组合箱梁的抗剪性能,制作两片缩尺试验梁,包括节段拼装变截面波形钢腹板连续箱梁和相同尺寸的整体浇筑变截面波形钢腹板连续箱梁.通过静力试验和数值分析,得到了节段拼装梁的剪应力分布规律、波形钢... 详细信息

为了研究节段预制拼装波形钢腹板连续组合箱梁的抗剪性能,制作两片缩尺试验梁,包括节段拼装变截面波形钢腹板连续箱梁和相同尺寸的整体浇筑变截面波形钢腹板连续箱梁.通过静力试验和数值分析,得到了节段拼装梁的剪应力分布规律、波形钢腹板承剪比例等.结果表明:在中跨对称加载作用下,中跨1/4位置处节段拼装梁与整体梁波形钢腹板的剪应力沿梁高方向均匀分布,节段拼装梁的剪应力值要大于整体梁的相应值.推导出节段拼装变截面波形钢腹板组合箱梁的剪应力计算公式,并考虑施工工艺对剪应力的影响,通过与实测值对比验证公式的准确性.两片试验梁的波形钢腹板的承剪比受荷载影响较小,保持一个恒定的比例;两片试验梁在中支座位置处的钢腹板承剪比均为50%,并沿着试验梁纵向方向向两侧不断增大;在中跨1/4位置,节段拼装梁钢腹板的承剪比达到85%以上,整体梁的钢腹板在该位置的承剪比在75%左右,两片试验梁在边跨相应位置承剪比相差不大.将适用于节段拼装混凝土箱梁的AASHTO接缝抗剪强度计算公式乘0.9可用于接缝截面抗剪承载力计算;上述公式值与试验值、有限元结果的误差在5%左右,可以较好地预测钢混组合结构胶接缝的抗剪强度.

关键词：桥梁工程节段拼装剪切性能室内试验变截面波形钢腹板抗剪承载力

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Fatty acid fouling of forward osmosis membrane:Effects of pH,calcium,membrane orientation,initial permeate flux and foulant composition

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Journal of Environmental Sciences 2016年第8期28卷 55-62页

作者： pin zhao Baoyu Gao Qinyan Yue Pan Liu Ho Kyong Shon Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong University School of Civil and Environmental Engineering University of Technology

Octanoic acid（OA） was selected to represent fatty acids in effluent organic matter（EOM）. The effects of feed solution（FS） properties, membrane orientation and initial permeate flux on OA fouling in forward osmosis（FO） were investigated. The undissociated OA formed a cake layer quickly and caused the water flux to decline significantly in the initial 0.5 hr at unadjusted p H 3.56; while the fully dissociated OA behaved as an anionic surfactant and promoted the water permeation at an elevated p H of 9.00. Moreover, except at the initial stage, the sudden decline of water flux（meaning the occurrence of severe membrane fouling） occurred in two conditions： 1.0.5 mmol/L Ca2＋, active layer facing draw solution（AL-DS） and 1.5 mol/L Na Cl（DS）; 2. No Ca2＋,active layer-facing FS（AL-FS） and 4 mol/L Na Cl（DS）. This demonstrated that cake layer compaction or pore blocking occurred only when enough foulants were absorbed into the membrane surface, and the water permeation was high enough to compact the deposit inside the porous substrate. Furthermore, bovine serum albumin（BSA） was selected as a co-foulant.The water flux of both co-foulants was between the fluxes obtained separately for the two foulants at p H 3.56, and larger than the two values at p H 9.00. This manifested that, at p H 3.56,BSA alleviated the effect of the cake layer caused by OA, and OA enhanced BSA fouling simultaneously; while at p H 9.00, the mutual effects of OA and BSA eased the membrane fouling.

关键词： Forward osmosis Membrane fouling Octanoic acid Water flux Reverse solute flux

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亚精胺通过抑制细胞凋亡、ROS生成及铁死亡减轻脂多糖诱导的小鼠心肌损伤

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南方医科大学学报 2024年第1期44卷 166-172页

作者：张晓红赵品蒯建科常超袁庆西北大学生命科学学院陕西西安710069 西北大学附属医院//西安市第三医院麻醉科陕西西安710018 西北大学生命科学与医学部陕西西安710069

目的观察亚精胺(SPD)对脂多糖(LPS)诱导的脓毒症心肌损伤的保护作用及机制研究。方法在动物水平上,C57BL/6小鼠随机分为:空白对照组(Control)、LPS组(10mg/kg)、LPS+SPD组(5mmol/L),应用HE染色观察小鼠心肌组织形态变化,透射电镜观察心... 详细信息

目的观察亚精胺(SPD)对脂多糖(LPS)诱导的脓毒症心肌损伤的保护作用及机制研究。方法在动物水平上,C57BL/6小鼠随机分为:空白对照组(Control)、LPS组(10mg/kg)、LPS+SPD组(5mmol/L),应用HE染色观察小鼠心肌组织形态变化,透射电镜观察心肌线粒体超微结构。在细胞水平上,根据处理方式及10和20μmol/LSPD,将大鼠H9c2心肌细胞随机分为:Control、LPS、LPS+SPD10、LPS+SPD20组,应用CCK-8试剂盒检测细胞活力,乳酸脱氢酶试剂盒检测细胞LDH水平、ELISA测定心肌细胞cTNI的变化,Western blot检测凋亡蛋白Bax、Bcl-2、Cleaved-caspase3表达水平及铁死亡相关蛋白SLC7A11、GPX4表达水平,应用荧光探针检测细胞活性氧ROS及Fe^(2+)水平,JC-1染色法检测细胞线粒体膜电位。结果小鼠心肌组织HE染色及透射电镜结果显示:Control组心肌及线粒体结构正常,LPS处理后,小鼠心肌组织结构紊乱、间隙变大,并且线粒体明显损伤,出现肿大、空泡化及坏死等现象,SPD处理可改善LPS导致的心肌及线粒体损伤。细胞水平上,与空白对照组相比,LPS组细胞活力明显下降(P<0.05),LDH、cTNI水平明显升高(P<0.05),细胞凋亡蛋白Bax、Cleaved-caspase3水平增加(P<0.05),Bcl-2蛋白表达水平下降(P<0.05),SLC7A11、GPX4蛋白的表达水平降低(P<0.05),细胞活性氧ROS及Fe^(2+)水平增加(P<0.05),线粒体膜电位下降;经SPD预处理后,H9c2细胞活力明显增加(P<0.05),LDH、cTNI水平降低(P<0.05),细胞凋亡蛋白Bax,Cleaved-caspase3的表达水平降低(P<0.05),Bcl-2蛋白表达水平增加(P<0.05),铁死亡相关蛋白SLC7A11、GPX4的表达水平增加(P<0.05),细胞活性氧ROS及Fe^(2+)水平降低(P<0.05),线粒体膜电位上升。结论SPD可减轻脓毒症心肌损伤,其机制与降低细胞凋亡、抑制细胞活性氧ROS产生、减轻铁死亡有关。

关键词：脓毒症脂多糖心肌损伤亚精胺铁死亡

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Effect of six kinds of scale inhibitors on calcium carbonate precipitation in high salinity wastewater at high temperatures

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Journal of Environmental Sciences 2015年第3期27卷 124-130页

作者： Xiaochen Li Baoyu Gao Qinyan Yue Defang Ma Hongyan Rong pin zhao Pengyou Teng Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong University

Precipitation of calcium carbonate （CaCOs） scale on heat transfer surfaces is a serious and expensive problem widely occurring in numerous industrial processes. In this study, we compared the scale inhibition effect of six kinds of commercial scale inhibitors and screened out the best one （scale inhibitor SQ-1211） to investigate its scale inhibition performance in highly saline conditions at high temperature through static scale inhibition tests. The influences of scale inhibitor dosage, temperature, heating time and pH on the inhibition efficiency of the optimal scale inhibitor were investigated. The morphologies and crystal structures of the precipitates were characterized by Scanning Electron Microscopy and X-ray Diffraction analysis. Results showed that the scale inhibition efficiency of the optimal scale inhibitor decreased with the increase of the reaction temperature. When the concentration of Ca^2＋ was 1600 mg/L, the scale inhibition rate could reach 90.7% at 80℃ at pH 8. The optimal scale inhibitor could effectively retard scaling at high temperature. In the presence of the optimal scale inhibitor, the main crystal structure of CaCOs changed from calcite to aragonite.

关键词： Scale inhibitor Scale inhibition efficiency High salinity High temperature Grystal growth

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面向任务的重叠联盟结构生成计算复杂性

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控制理论与应用 2024年第1期41卷 163-171页

作者：张国富宋晓晓苏兆品岳峰合肥工业大学计算机与信息学院安徽合肥230601 合肥工业大学智能互联系统安徽省实验室安徽合肥230009 合肥工业大学工业安全应急技术安徽省重点实验室安徽合肥230601

传统的重叠联盟形成问题大都聚焦智能体,鲜有从任务视角出发.为此,本文首先构建了一种面向任务的重叠联盟结构生成模型,并分析了其解空间和相关决策问题的计算复杂性.此外,基于流网络分别设计了相应的孤立联盟、重叠联盟、重叠联盟结构... 详细信息

传统的重叠联盟形成问题大都聚焦智能体,鲜有从任务视角出发.为此,本文首先构建了一种面向任务的重叠联盟结构生成模型,并分析了其解空间和相关决策问题的计算复杂性.此外,基于流网络分别设计了相应的孤立联盟、重叠联盟、重叠联盟结构成功性判别算法和最优重叠联盟结构生成算法.分析结果表明,判别孤立联盟、重叠联盟、重叠联盟结构的成功性的时间复杂度均与智能体数和任务数呈多项式关系,而搜索最优重叠联盟结构的时间复杂度与智能体数和任务数呈指数关系.最后,通过仿真实验验证了上述结果.

关键词：多智能体系统重叠联盟结构生成计算复杂性成功性判别流网络

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Effects of nano-sized aluminum on detonation characteristics and metal acceleration for RDX-based aluminized explosive

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Defence Technology（防务技术） 2021年第2期17卷 327-337页

作者： Dan-yang Liu pin zhao Serene Hay-Yee Chan Huey Hoon Hng Lang Chen State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China School of Materials Science and Engineering Nanyang Technological University639798Singapore

Nano-sized aluminum(Nano-Al)powders hold promise in enhancing the total energy of explosives and the metal acceleration ability at the same time.However,the near-detonation zone effects of reaction between Nano-Al with detonation products remain unclear.In this study,the overall reaction process of 170 nm Al with RDX explosive and its effect on detonation characteristics,detonation reaction zone,and the metal acceleration ability were comprehensively investigated through a variety of experiments such as the detonation velocity test,detonation pressure test,explosive/window interface velocity test and confined plate push test using high-resolution laser interferometry.Lithium fluoride(LiF),which has an inert behavior during the explosion,was used as a control to compare the contribution of the reaction of aluminum.A thermochemical approach that took into account the reactivity of aluminum and ensuing detonation products was adopted to calculate the additional energy release by afterburn.Combining the numerical simulations based on the calculated afterburn energy and experimental results,the parameters in the detonation equation of state describing the Nano-Al reaction characteristics were calibrated.This study found that when the 170 nm Al content is from 0%to 15%,every 5%increase of aluminum resulted in about a 1.3%decrease in detonation velocity.Manganin pressure gauge measurement showed no significant enhancement in detonation pressure.The detonation reaction time and reaction zone length of RDX/Al/wax/80/15/5 explosive is 64 ns and 0.47 mm,which is respectively 14%and 8%higher than that of RDX/wax/95/5 explosive(57 ns and 0.39 mm).Explosive/window interface velocity curves show that 170 nm Al mainly reacted with the RDX detonation products after the detonation front.For the recording time of about 10 ms throughout the plate push test duration,the maximum plate velocity and plate acceleration time accelerated by RDX/Al/wax/80/15/5 explosive is 12%and 2.9 ms higher than that of RDX/LiF/wax/80/15/5,respectively,i

关键词： Nano-sized aluminum Detonation reaction zone Explosive metal acceleration Thermodynamic equilibrium calculation Laser interferometry

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阿得贝利单抗联合化疗一线治疗广泛期小细胞肺癌的成本效果分析

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中国现代应用药学 2024年第9期41卷 1267-1274页

作者：李越孔树佳赵嫔王雪梅梁丽菊翁稚颖昆明医科大学药学院云南省天然药物药理重点实验室昆明650500 云南省肿瘤医院昆明650118

目的从中国医疗卫生体系角度评价阿得贝利单抗联合化疗对比化疗一线治疗广泛期小细胞肺癌的成本效果。方法采用CAPSTONE-1临床试验所获数据(阿得贝利单抗组230例,化疗组232例),建立马尔可夫模型模拟广泛期小细胞肺癌疾病过程。分别计算... 详细信息

目的从中国医疗卫生体系角度评价阿得贝利单抗联合化疗对比化疗一线治疗广泛期小细胞肺癌的成本效果。方法采用CAPSTONE-1临床试验所获数据(阿得贝利单抗组230例,化疗组232例),建立马尔可夫模型模拟广泛期小细胞肺癌疾病过程。分别计算每组的总成本、质量调整生命年(quality-adjusted life-years,QALYs)、增量成本效果比(incremental cost-effectiveness ratio,ICER)。对关键参数进行敏感性分析。结果与单纯化疗方案(依托泊苷联合卡铂)相比,在考虑慈善援助的情景下,阿得贝利单抗联合化疗的ICER为157128.79元·QALY^(-1),在不考虑慈善援助的条件下,阿得贝利单抗联合化疗的ICER为351367.27元·QALY^(-1)。敏感性分析结果显示效用值和阿得贝利单抗的价格是主要的影响因素。结论阿得贝利单抗联合化疗方案对比单纯化疗方案治疗广泛期小细胞肺癌在中国现有的经济水平下不具有成本效果优势;考虑慈善赠药时,阿得贝利单抗联合化疗方案具有成本效果优势的概率为44.5%。

关键词：阿得贝利单抗小细胞肺癌成本效用分析药学经济学

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