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Acceleration of the particulate organic matter hydrolysis by start-up stage recovery and its original microbial mechanism

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Frontiers of Environmental Science & Engineering 2021年第1期15卷 175-184页

作者： Yanqing Duan Aijuan Zhou Xiuping Yue zhichun zhang Yanjuan Gao Yanhong Luo Xiao zhang College of Environmental Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Engineer Research Institute of Sludge Disposition and Resources Taiyuan University of TechnologyTaiyuan 030024China School of Environment and Safety Engineering North University of ChinaTaiyuan 030051China

To address the availability of carbon sources for denitrification,the accelerated hydrolysis of the most abundant but low-availability fraction of particulate organic matter(POM)was *** sieves with different pore sizes were used as primary pretreatment at the start-up-stage of the biological process to separate some POM from the liquid *** changes in soluble carbohydrates and proteins were monitored to investigate the hydrolysis performance of the sieved POM,with waste activated sludge(WAS)as the control *** results showed that an average of 35%POM could be entrapped before filtrate mat *** addition,benefiting from the high polysaccharides concentration,as well as the high availability due to the relatively loose physical structure,a 23%hydrolysis efficiency of POM was obtained,in contrast to that of WAS(3.4%),with a hydrolysis constant of 0.39 h^(−1).The prominent performance was also attributed to the unique microbial communities having been domesticated at a lower temperature,especially the cellulose-degrading bacteria Paraclostridium and psychrophile Psychrobacter,making up 6.94%and 2.56%,***,the potential benefits and application of improved POM hydrolysis by start-up stage recovery via mesh sieves combined with anaerobic fermentation were evaluated,including selective POM entrapment,alleviation of blockage and wear,and a reduction in aeration *** the proposed strategy,carbon availability for biological nutrient removal(BNR)processes is anticipated to be improved more economically than that can be achieved by primary clarifier elimination.

关键词： Particulate organic matter(POM) Hydrolysis Microbial community Mass balance

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Icephobic materials and strategies:From bio-inspirations to smart systems

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Droplet 2024年第3期3卷 1-26页

作者： Xinlin Li Yan Liu zhichun zhang Yanju Liu Jinsong Leng Centre for Composite Materials and Structures School of AstronauticsHarbin Institute of TechnologyHarbinChina Key Laboratory of Bionic Engineering(Ministry of Education) College of Biological and Agricultural EngineeringJilin UniversityChangchunChina Institute of Structured and Architected Materials Liaoning Academy of MaterialsShenyangChina Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbinChina

Unwanted ice formations may cause severe functional degradations of facilities and also have a negative impact on their *** and removing ice accumula-tion is always a hot topic in the industrial and technological *** functional surfaces have been greatly studied for several decades and have proved to be excel-lent candidates for passive anti-/deicing ***,the drawbacks limit their potential industrial uses under harsh conditions,like low temperatures and high *** researches on bionic surfaces are focused on a certain function of nat-ural creatures and their underlined fundamental theories are revealed by taking the interface as the ***,living organisms,either plants or animals,are often sensitive and responsive to their surroundings,avoiding risks and even self-repairing upon *** this prospect,a novel view of the bionic icephobic materials has been proposed in the present review,which is expected to be studied and designed by taking the biological species as a *** two representative icephobic mate-rials,the anti-/deicing theories of superhydrophobic and slippery surfaces are first ***,the recent progress of smart icephobic strategies is summarized from interfaces to *** aim to provide new bionic insights on designing future icephobic strategies.

关键词： removing smart summarized

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Quick identification of ABC trilayer graphene at nanoscale resolution via a near-field optical route

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Materials Futures 2023年第1期2卷 158-166页

作者： Peiyue Shen Xianliang Zhou Jiajun Chen Aolin Deng Bosai Lyu zhichun zhang Shuo Lou Saiqun Ma Binbin Wei Zhiwen Shi Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education) Shenyang National Laboratory for Materials ScienceSchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093People’s Republic of China Institute of System Engineering Beijing 100191People’s Republic of China

ABC-stacked trilayer graphene has exhibited a variety of correlated phenomena owing to its relatively flat bands and gate-tunable ***,convenient methods are still lacking for identifying ABC graphene with nanometer-scale *** we demonstrate that the scanning near-field optical microscope working in ambient conditions can provide quick recognition of ABC trilayer graphene with no ambiguity and excellent resolution(∼20 nm).The recognition is based on the difference in their near-field infrared(IR)responses between the ABA and ABC *** show that in most frequencies,the response of the ABC trilayer is weaker than the ABA ***,near the graphene phonon frequency(∼1585 cm−1),ABC’s response increases dramatically when gated and exhibits a narrow and sharp Fano-shape resonant line,whereas the ABA trilayer is largely ***,the IR contrast between ABC and ABA becomes reversed and can even be striking(ABC/ABA∼3)near the graphene phonon *** observed near-field IR features can serve as a golden rule to quickly distinguish ABA and ABC trilayers with no ambiguity,which could largely advance the exploration of correlation physics in ABC-stacked trilayer graphene.

关键词： ABC trilayer graphene identification SNOM nanoscale Fano resonance

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Overview of Recombinant Skin Models and Progress in Their Application in Vitro Assessment of Toxicity and Efficacy

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China Detergent & Cosmetics 2023年第1期8卷 38-44页

作者： zhang Bowen Xu Qiufeng GU Wu zhang zhichun Dai Yumeng Han Zhiyang Xu Mingkai Wang Yu Key Laboratory of Pollution Ecology and Environment Engineering Chinese Academy of SciencesChina Shenyang Zeer Testing Service Co. Ltd.China

A recombinant skin model is a model in which skin cells are grown in vitro on a bioactive scaffold and provided with adequate nutrition to promote cell proliferation and differentiation to produce a mock skin structure and biological features. The development of recombinant skin models allows for effective and scientifically sound in vitro evaluation tests. This review briefly summarizes the overview of recombinant skin models and the progress of their application in in vitro evaluation which focuses on three aspects: skin irritation, skin corrosivity, and anti-skin aging. Moreover, an outlook on the future development of recombinant skin models is also provided in this review.

关键词： recombinant skin model in vitro evaluation irritation corrosiveness anti-skin aging

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Automated detection of myopic maculopathy from color fundus photographs using deep convolutional neural networks

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Eye and Vision 2024年第4期10卷 11-22页

作者： Jun Li Lilong Wang Yan Gao Qianqian Liang Lingzhi Chen Xiaolei Sun Huaqiang Yang Zhongfang Zhao Lina Meng Shuyue Xue Qing Du zhichun zhang Chuanfeng LV Haifeng Xu Zhen Guo Guotong Xie Lixin Xie Qingdao Eye Hospital of Shandong First Medical University 5 Yanerdao RoadQingdao 266071China State Key Laboratory Cultivation Base Shandong Provincial Key Laboratory of OphthalmologyShandong Eye InstituteShandong First Medical University&Shandong Academy of Medical SciencesQingdao 266071China Ping An Healthcare Technology 9F Building BPingAn IFCNo.1-3 Xinyuan South RoadBejing 100027China Shandong Eye Hospital of Shandong First Medical University Jinan 250021China Rongcheng Eye Hospital Weihai 264200China Hospital of PLA Navy Qingdao 266071China Qilu Hospital of Shandong University(Qingdao) Qingdao 266035China Ping An Healthcare and Technology Company Limited hanghai 200030China ping An International Smart City Technology Company Limited Shenzhen 518000China.

Background:Myopic maculopathy(MM)has become a major cause of visual impairment and blindness worldwide,especially in East Asian *** learning approaches such as deep convolutional neural networks(DCNN)have been successfully applied to identify some common retinal diseases and show great potential for the intelligent analysis of *** study aimed to build a reliable approach for automated detection of MM from retinal fundus images using DCNN ***:A dual-stream DCNN(DCNN-DS)model that perceives features from both original images and corresponding processed images by color histogram distribution optimization method was designed for classification of no MM,tessellated fundus(TF),and pathologic myopia(PM).A total of 36,515 gradable images from four hospitals were used for DCNN model development,and 14,986 gradable images from the other two hospitals for external *** also compared the performance of the DCNN-DS model and four ophthalmologists on 3000 randomly sampledfundus ***:The DCNN-DS model achieved sensitivities of 93.3%and 91.0%,specificities of 99.6%and 98.7%,areas under the receiver operating characteristic curves(AUCs)of 0.998 and 0.994 for detecting PM,whereas sensitivities of 98.8%and 92.8%,specificities of 95.6%and 94.1%,AUCs of 0.986 and 0.970 for detecting TF in two external testing *** the sampled testing dataset,the sensitivities of four ophthalmologists ranged from 88.3%to 95.8%and 81.1%to 89.1%,and the specificities ranged from 95.9%to 99.2%and 77.8%to 97.3%for detecting PM and TF,***,the DCNN-DS model achieved sensitivities of 90.8%and 97.9%and specificities of 99.1%and 94.0%for detecting PMand T,***:The proposed DCNN-DS approach demonstrated reliable performance with high sensitivity,specificity,and AUC to classify different MM levels on fundus photographs sourced from *** can help identify MM automatically among the large myopic groups and show great potenti

关键词： Myopic maculopathy Tessellated fundus Pathologic myopia Deep convolutional neural network Color fundus image

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基于粘结界面模型的三维裂纹扩展研究

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计算物理 2010年第4期27卷 586-592页

作者：张志春强洪夫周伟西安高科技研究所201室陕西西安710025

根据界面断裂的特点,将粘结界面模型应用于有限元,采用非线性显式动力学算法,编写粘结-体积单元计算程序.其中体积和粘结单元分别采用四面体和三棱柱单元;粘结单元本构关系选择双线性内聚力-位移曲线,避免了界面完全断裂后发生穿透;以... 详细信息

根据界面断裂的特点,将粘结界面模型应用于有限元,采用非线性显式动力学算法,编写粘结-体积单元计算程序.其中体积和粘结单元分别采用四面体和三棱柱单元;粘结单元本构关系选择双线性内聚力-位移曲线,避免了界面完全断裂后发生穿透;以界面相对位移的形式定义线性损伤准则;以Benzeggagh-Kenane模式的扩展准则确定界面失效位移;以Turon模式的初始损伤准则确定界面启裂位移.该程序能够实现混合加载模式下材料界面断裂问题的三维数值模拟.用所编写的程序(CVFEM)分别对Ⅰ,Ⅱ,Ⅲ型裂纹扩展问题进行数值模拟,并且与Abaqus6.7计算结果进行对比.

关键词：界面断裂粘结单元显式动力学算法

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Characteristics of Climate Change and its Response in the Qinghai-Tibet Plateau during 1971-2010

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Journal of Landscape Research 2016年第6期8卷 41-45,52页

作者： zhang zhichun HAN Wenling WANG Jun CAI Yongxiang LI Gang CAI Zhongzhou zhang Chengjia SHENG Haiyan ZHAO Chaojun Qinghai Provincial Center for Climate Qinghai Provincial Center for Lightning Disaster Makehe Forestry Bureau Qinghai University Qumalai County Meteorological Bureau

Climate data during 1971-2010 showed that mo st areas of Qinghai-Tibet Plateau showed warm wet climate change type dominated by temperature and humidity *** increase magnitude was the smallest in spring and the largest in winter,and the precipitation increased at the low-altitude area and decreased at high *** warm wet climate change caused Qinghai-Tibet Plateau alpine grassland degradation,reduction of glacier and frozen soil,wetland reduction and other environmental problems.

关键词： Qinghai-Tibet Plateau Climate change Grassland degradation Reduction of froz en soil Wetland reduction

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FRP筋拉挤成型工艺过程的光纤光栅监测与结果分析

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东南大学学报（自然科学版） 2005年第A01期35卷 23-26页

作者：张志春王川周智欧进萍哈尔滨工业大学土木工程学院哈尔滨150090

FRP材料的力学性能受到成型加工参数的影响,而利用传统的方法不能对这些参数进行准确的测量。本文基于光栅对拉挤工艺生产FRP筋的过程中的固化温度和由于树脂固化过程中的化学收缩造成的残余应变进行监测,并采用双光栅法实现温度与应变... 详细信息

FRP材料的力学性能受到成型加工参数的影响,而利用传统的方法不能对这些参数进行准确的测量。本文基于光栅对拉挤工艺生产FRP筋的过程中的固化温度和由于树脂固化过程中的化学收缩造成的残余应变进行监测,并采用双光栅法实现温度与应变的双参量同时监测.结果表明:利用光栅测量的温度较设备设定温度低10℃左右;光栅在模具中所受到的应变随进入模具的长度增加而增加,在温度达到最高的固化温度处应变开始减小,表明了在此位置树脂开始固化;固化后的FRP筋的应变与温度变化呈线性关系,利用光栅测量FRP筋热膨胀系数为5.19×10-6/℃;同时在室温下,受拉状态下的残余应变为-50με左右,这为该材料的残余应力分析提供了依据.利用光栅可以定量测量FRP挤拉成型工艺过程中的固化温度,树脂在模具中的固化状态以及FRP制品中的内部残余应变.

关键词：光纤Bragg光栅固化监测固化温度残余应变 FRP材料拉挤工艺

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基于SPH-FEM转换算法的7.62mm步枪弹冲击30CrMnSiA钢板的数值计算

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计算物理 2012年第1期29卷 73-81页

作者：张志春强洪夫傅学金夏薇第二炮兵工程学院201室陕西西安710025 第二炮兵工程学院402室陕西西安710025

从转换判据和时间步长控制两个方面对光滑粒子流体动力学-有限元(SPH-FEM)转换算法进行改进,采用改进的SPH-FEM转换算法对7.62 mm步枪弹冲击特殊热处理的30CrMnSiA钢板进行全尺寸三维数值计算,将子弹在冲击过程中发生严重畸变的有限单... 详细信息

从转换判据和时间步长控制两个方面对光滑粒子流体动力学-有限元(SPH-FEM)转换算法进行改进,采用改进的SPH-FEM转换算法对7.62 mm步枪弹冲击特殊热处理的30CrMnSiA钢板进行全尺寸三维数值计算,将子弹在冲击过程中发生严重畸变的有限单元转换为SPH粒子继续参与计算.子弹采用弹塑性模型,靶板采用修正的Johnson-Cook强度模型和Gruneisen状态方程.针对不同的子弹初速,计算靶板盘形凹陷和冲塞两种破坏模式,计算结果与实验结果吻合较好.表明改进的SPH-FEM转换算法能够合理高效地利用有限单元和SPH粒子,为低强度子弹冲击高强度靶板的计算提供一种有效途径.

关键词： SPH—FEM转换算法 7.62 mm步枪弹 30CrMnSiA钢板冲击

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一种光滑粒子流体动力学-有限元法转换算法及其在冲击动力学中的应用

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西安交通大学学报 2011年第1期45卷 105-110页

作者：张志春强洪夫高巍然第二炮兵工程学院201室西安710025

为了解决冲击动力学中的大变形问题,提出了一种光滑粒子流体动力学-有限元法(SPH-FEM)转换算法,以等效Mises应力作为转换判据,将冲击过程中局部大变形区域的有限元网格转换为SPH粒子.该算法在大变形区域使用具有优势的SPH,在小变形区域... 详细信息

为了解决冲击动力学中的大变形问题,提出了一种光滑粒子流体动力学-有限元法(SPH-FEM)转换算法,以等效Mises应力作为转换判据,将冲击过程中局部大变形区域的有限元网格转换为SPH粒子.该算法在大变形区域使用具有优势的SPH,在小变形区域使用精度和效率更高的FEM,为冲击动力学问题的数值计算提供了一条有效途径.使用SPH-FEM转换算法对圆柱形钢弹正冲击钢板发生冲塞破坏的过程进行了三维数值计算,计算结果与实验吻合较好,显示了该算法在计算精度方面的优势.在实际工程中,需要根据具体材料的失效模式,选择更加合适的转换判据.

关键词：光滑粒子流体动力学有限元法转换算法冲击

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