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黄土边坡微生物矿化加固及植被恢复试验

水土保持研究 2025年第1期32卷 227-234,242页

作者：雷磊王良樊成虎刘子瑞宋洋薛倩楠田堪良段金贵国网陕西省电力有限公司电力科学研究院西安710100 国网(西安)环保技术中心有限公司西安710100 国网陕西省电力有限公司西安710100 国网陕西省电力有限公司安康水力发电公司陕西安康725009 国网陕西省电力有限公司西安供电公司西安710048 西北农林科技大学水土保持研究所陕西杨凌712100 中国科学院水利部水土保持研究所陕西杨凌712100 黄河水利委员会西峰水土保持科学试验站甘肃庆阳745000

[目的]研究黄土边坡微生物矿化加固及植被恢复,为黄土边坡的加固及坡面土壤侵蚀防治提供新方法和新技术。[方法]采用微生物诱导碳酸钙沉淀(Microbially Induced Calcite Precipitation,MICP)技术对黄土边坡进行矿化加固处理,并在固化黄... 详细信息

[目的]研究黄土边坡微生物矿化加固及植被恢复,为黄土边坡的加固及坡面土壤侵蚀防治提供新方法和新技术。[方法]采用微生物诱导碳酸钙沉淀(Microbially Induced Calcite Precipitation,MICP)技术对黄土边坡进行矿化加固处理,并在固化黄土边坡上进行植被恢复,利用扫描电子显微镜(SEM)和光学显微镜,从微观角度探究MICP技术对黄土边坡矿化加固的作用机制,并统计分析了固化黄土边坡的植被恢复效果。[结果]采用MICP技术对黄土边坡进行固化处理后,在坡面上生成的固化层将松散且相邻的土壤颗粒胶结在一起,使黄土坡面形成一个整体,固化层最大厚度为0.23 cm,平均厚度为0.21 cm;固化黄土边坡恢复植被后第60天,A1,A2,B1,B2,A1B1,A2B2各区域内植被成活率比A0,B0,A0B0各区域分别显著提高26.66%,20%,37.5%,25%,33.33%,25%(p<0.05),第60天后,各区域内植被的成活率均差异显著,而且固化后加保水剂的A1,B1,A1B1各区域内植被的成活率最高;固化后加保水剂的B1和A1B1区域内紫穗槐高度和地径的生长变化量最大,且固化后加保水剂的A1,B1,A1B1各区域内麦冬草和紫穗槐的生长状况最好。[结论]采用MIC技术可以有效固化黄土坡面,与植被恢复技术相结合,既能防治土壤侵蚀,又能恢复生态环境。这种综合防治措施为黄土边坡水土流失防治与生态修复提供了良好的技术支持。

关键词：黄土边坡微生物矿化加固技术植被恢复边坡防护

Ⅱ~Ⅲ期胃癌根治术中淋巴结清扫数目与远期复发、死亡的关系探讨

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罕少疾病杂志 2025年第1期32卷 119-120,123页

作者：岑磊磊朱桂华南通市通州区中医院江苏南通226300

目的探讨Ⅱ~Ⅲ期胃癌患者根治术中淋巴结清扫数目与远期复发、死亡的关系。方法回顾性分析2018年12月至2020年12月期间本院收治的186例Ⅱ~Ⅲ期胃癌并行根治术患者的临床资料,并对患者随访至2022年12月。根据国际抗癌联盟要求和术中淋... 详细信息

目的探讨Ⅱ~Ⅲ期胃癌患者根治术中淋巴结清扫数目与远期复发、死亡的关系。方法回顾性分析2018年12月至2020年12月期间本院收治的186例Ⅱ~Ⅲ期胃癌并行根治术患者的临床资料,并对患者随访至2022年12月。根据国际抗癌联盟要求和术中淋巴结清扫数目分为≥25枚组(88例)和15~25枚组(98例),在控制性别、年龄、肿瘤大小、肿瘤部位等变量的前提下,采用COX风险回归分析淋巴结清扫数目与胃癌患者远期复发和死亡的关系。结果随访2年后,186例患者中胃癌复发61例,死亡38例,复发率和死亡率分别为32.80%和20.43%。单因素分析显示,≥25枚组患者胃癌的复发率为25.00%低于15~25枚组的39.80%(P<0.05);≥25枚组患者的死亡率为12.50%低于15~25枚组的27.55%(P<0.05);COX风险回归分析显示,淋巴结清扫数目是胃癌患者远期复发和死亡的危险因素(HR=2.776、1.669,P<0.05)。结论 Ⅱ~Ⅲ期胃癌患者根治术中淋巴结清扫数目与远期复发、死亡显著相关,且淋巴结清扫数目≥25枚患者胃癌远期复发、死亡的风险较低。

关键词：胃癌根治术淋巴结清扫数目远期复发死亡病理分期

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Electrochemical Fabrication of rGO-embedded Ag-TiO2 Nanoring/Nanotube Arrays for Plasmonic Solar Water Splitting

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Nano-Micro Letters 2019年第4期11卷 674-689页

作者： Lixia Sang lei lei Clemens Burda Key Laboratory of Enhanced Heat Transfer and Energy Conservation Ministry of Education and Key Laboratory of Heat Transfer and Energy ConversionBeijing MunicipalityCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124People’s Republic of China Department of Chemistry Center for Chemical Dynamics and Nanomaterials ResearchCase Western Reserve University10900 Euclid AvenueClevelandOH 44106USA

Effective utilization of hot electrons generated from the decay of surface plasmon resonance in metal nanoparticles is conductive to improve solar water splitting ***,Ag nanoparticles and reduced graphene oxide(rGO)co-decorated hierarchical TiO2 nanoring/nanotube arrays(TiO2 R/T)were facilely fabricated by using two-step electrochemical anodization,electrodeposition,and photoreduction *** studies were conducted to elucidate the effects of rGO and Ag on the morphology,photoresponse,charge transfer,and photoelectric properties of ***,scanning electron microscope images confirm that the Ag nanoparticles adhered on TiO2 R/T and TiO2 R/T-rGO have similar diameter of 20 nm except for TiO2 R-rGO/***,the UV-Vis DRS and scatter spectra reveal that the optical property of the Ag-TiO2 R/T-rGO ternary composite is enhanced,ascribing to the visible light absorption of plasmonic Ag nanoparticles and the weakening effect of rGO on light ***,intensity-modulated photocurrent spectroscopy and photoluminescence spectra demonstrate that rGO can promote the hot electrons transfer from Ag nanoparticles to Ti substrate,reducing the photogenerated electron-hole ***,Ag-TiO2 R/T-rGO photoanode exhibits high photocurrent density(0.98 mA cm?2)and photovoltage(0.90 V),and the stable H2 evolution rate of 413μL h?1 cm?2 within 1.5 h under AM 1.5 which exceeds by 1.30 times than that of pristine TiO2 R/*** line with the above results,this work provides a reliable route synergizing rGO with plasmonic metal nanoparticles for photocatalysis,in which,rGO presents a broad absorption spectrum and effective photogenerated electrons transfer.

关键词： TiO2 nanoring/nanotube hierarchical structure Reduced graphene oxide Spectral responses Plasmonic Ag nanoparticles Water splitting

The nanohertz stochastic gravitational wave background from cosmic string loops and the abundant high redshift massive galaxies

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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 11-19页

作者： Ziwei Wang lei lei Hao Jiao lei Feng Yi-Zhong Fan Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Department of Physics McGill UniversityMontreal H3A 2T8Canada

Recently,pulsar timing array(PTA)experiments have provided compelling evidence for the existence of the nanohertz stochastic gravitational wave background(SGWB).In this work,we demonstrated that cosmic string loops generated from cosmic global strings offer a viable explanation for the observed nanohertz SGWB data,requiring a cosmic string tension parameter of log(Gμ)~-12 and a loop number density of log N~***,we revisited the impact of cosmic string loops on the abundance of massive galaxies at high ***,our analysis revealed challenges in identifying a consistent parameter space that can concurrently explain both the SGWB data and observations from the James Webb Space *** indicates the necessity for either extending the existing model employed in this research or acknowledging distinct physical origins for these two phenomena.

关键词： nanohertz stochastic gravitational-wave background cosmic string loop JamesWebb Space Telescope galaxy formation

Inverse determination of multiple heat sources’ release history in indoor environments

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Building Simulation 2021年第4期14卷 1263-1275页

作者： lei lei Hao Zheng Bing Wu Yu Xue School of Architecture and Transportation Engineering Guilin University of Electronic Technology1 Jinji RoadGuilin541004China School of Civil Engineering Dalian University of Technology2 Linggong RoadDalian116024China

The heat source of an air-conditioned room has an important effect on the indoor environment. The release rates of heat sources are related to the comfort of the designed thermal environment, so they must be determined. Traditional design methods rely on iterative guess-and-correct, which consumes resources and time and cannot meet the needs of modern design. This study aims to establish an inverse model of Tikhonov regularization and least square optimization by using computational fluid dynamics (CFD), so that researchers can accurately determine the time release rate of multiple heat sources with known parameters. The temporal release rates can then be solved based on the inverse matrix operation with the temperature series at different discrete times. The study speeds up the solving process and expresses the temperature as the convolution integral between the temperature response of the thermal response factor and the arbitrary release rate. The results show that applying the above method to the quantization of the temporal release rates of three heat sources in a three-dimensional cavity can correctly determine the temporal release rates of multiple heat sources. The errors between the inversely determined release rates and the actual release rates are less than 40%.

关键词： inverse model multiple heat sources temporal release rate inverse matrix CFD

Self-adaptive combination method for temporal evidence based on negotiation strategy

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Science China(Information Sciences) 2020年第11期63卷 56-68页

作者： Yafei SONG Jingwei ZHU lei lei Xiaodan WANG College of Air and Missile Defense Air Force Engineering University Institute of High Technology Air Force Engineering University College of Information and Navigation Air Force Engineering University

In temporal information fusion, the information collected by sensors is obtained dynamically with the passage of time. Unlike the spatial information fusion, temporal fusion should be dynamic. Evidence theory has been applied to fuse temporal and spatial information; however, existing temporal fusion methods do not treat conflicting and non-conflicting evidence sources distinctively. Moreover, unlike spatial evidence sources, which are obtained simultaneously, temporal evidence sources cannot be evaluated simultaneously to obtain their degree of reliability. Thus, it is necessary to develop a method for temporal evidence *** this paper, a self-adaptive combination method for temporal evidence is proposed based on the negotiation strategy. In the proposed method, a set called an evidence set is constructed by the cumulative temporal fusion results of the previous moment, current moment, and future moment. The evidence set is evaluated as conflicting or non-conflicting according to the maximum power pignistic probability distance between each pair of evidence sources in the set. Then, temporal evidence sources are self-adaptively combined by different methods according to the degree of conflict. Numerical experiments were conducted to evaluate the performance of the proposed method. The results indicated that the proposed method is sufficiently effective and robust to support decision making.

关键词： information fusion evidence theory temporal fusion self-adaptive combination negotiation strategy

Evaluation on the interface characteristics,thermal conductivity,and annealing effect of a hot-forged Cu-Ti/diamond composite

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Journal of Materials Science & Technology 2020年第14期47卷 7-14页

作者： lei lei Yu Su Leandro Bolzoni Fei Yang Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton3240New Zealand

A Cu-1.5 wt.%Ti/Diamond(55 vol.%)composite was fabricated by hot forging from powder mixture of copper,titanium and diamond powders at 1050?C.A nano-thick TiC interfacial layer was formed between the diamond particle and copper matrix during forging,and it has an orientation relationship of(111)TiC//(002)Cu&[110]TiC//[110]Cuwith the copper *** analysis suggests that TiC is semicoherently bond with copper matrix,which helps reduce phonon scattering at the TiC/Cu interface and facilitates the heat transfer,further leading to the hot-forged copper/diamond composite(referred as to Cu-Ti/Dia-0)has a thermal conductivity of 410 W/m K,and this is about 74%of theoretical thermal conductivity of hot-forged copper/composite(552 W/m K).However,the formation of thin amorphous carbon layer in diamond particle(next to the interfacial TiC layer)and deformed structure in the copper matrix have adverse effect on the thermal conductivity of Cu-Ti/Dia-0 composite.800℃-annealing eliminates the discrepancy in TiC interface morphology between the diamond-{100}and-{111}facets of Cu-Ti/Dia-0 composite,but causes TiC particles coarsening and agglomerating for the Cu-Ti/Dia-2 composite and interfacial layer cracking and spallation for the Cu-Ti/Dia-1 *** addition,a large amount of graphite was formed by titanium-induced diamond graphitization in the Cu-Ti/Dia-2 *** these factors deteriorate the heat transfer behavior for the annealed Cu-Ti/Dia *** heat treatment needs to be continually investigated to improve the thermal conductivity of hot-forged CuTi/Dia composite by eliminating deformed structure in the copper matrix with limit/without impacts on the formed TiC interfacial layer.

关键词： Copper/diamond composite Hot forging Interface characteristics Thermal conductivity Heat treatment

Hybrid graded element model for transient heat conduction in functionally graded materials

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Acta Mechanica Sinica 2012年第1期28卷 128-139页

作者： lei-lei Cao Qing-Hua Qin Ning Zhao Key Laboratory for Road Construction Technology＆ Equipment of MOE Chang＇ an University 710064 Xi＇ an China Research School of Engineering Australian National UniversityCanberra ACT 0200 Australia School of Mechatronics Northwestern Polytechnical University710072 Xi＇an China

This paper presents a hybrid graded element model for the transient heat conduction problem in functionally graded materials （FGMs）. First, a Laplace transform approach is used to handle the time variable. Then, a fundamental solution in Laplace space for FGMs is constructed. Next, a hybrid graded element is formulated based on the obtained fundamental solution and a frame field. As a result, the graded properties of FGMs are naturally reflected by using the fundamental solution to interpolate the intra-element field. Further, Stefest＇s algorithm is employed to convert the results in Laplace space back into the time-space domain. Finally, the performance of the proposed method is assessed by several benchmark examples. The results demonstrate well the efficiency and accuracy of the proposed method.

关键词： Graded element model Functionally graded materials Hybrid FEM Transient heat conduction

Migration and differentiation of bone marrow-derived multipotent adult progenitor cells through tail vein injection in a rat model of cerebral ischemia

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Neural Regeneration Research 2009年第2期4卷 118-122页

作者： lei lei Ruixiang Zhou Department of Neurology Hospital Affiliated to Wuhan University of Science and Technology Wuhan 430064 Hubei Province China Department of Neurology Wuhan First Hospital Hospital of Integrated Traditional and Western Medicine Tongji Medical College of Huazhong University of Science and Technology Wuhan 430022 Hubei Province China

BACKGROUND： Multipotent adult progenitor cells （MAPCs） from the bone marrow have been shown to differentiate into neurons. OBJECTIVE： To observe migration, survival, and neuronal-like differentiation of MAPCs by tail vein injection. DESIGN, TIME AND SETTING： Randomized, controlled experiment of neural tissue engineering was performed at the Laboratory for Cardio-Cerebrovascular Disease, Hospital of Integrated Traditional and Western Medicine, Tongji Medical College of Huazhong University of Science and Technology between September 2006 and August 2007. MATERIALS： Eighty Sprague Dawley rats, 3-6 months old, underwent cerebral ischemia/reperfusion by thread technique, and were randomly divided into model and MAPCs groups （n = 40）. METHODS： Mononuclear cells were harvested from bone marrow using the FicolI-Paque density gradient centrifugation method. After removing CD45 and glycophorin A-positive cells （GLYA＋） with immunomagnetic beads, CD45 GLYA adult progenitor cells were labeled with bromodeoxyuridine （5-bromo-2-deoxyuridine, BrdU）. A total of 1 mL cell suspension, containing 5 × 10^6 MAPCs, was injected into the MAPCs group through the tail vein. A total of 1 mL normal saline was injected into the model rats. MAIN OUTCOME MEASURES： After 60 days, BrdU and neuron-specific enolase double-positive cells were observed using immunofluorescence. Cell morphology was observed under electron microscopy, and nerve growth factor mRNA was measured through RT-PCR. In addition, rat neurological functions were measured with behavioral tests. RESULTS： Immunofluorescence revealed that MAPCs positive for BrdU and neuron specific enolase were found surrounding the ischemic focus in the MAPCs group. Microscopic observation suggested that MAPCs-derived neuronal-like cells connected with other nerve cells to form synapses. Compared with the model animals, the level of nerve growth factor mRNA was significantly upregulated in rats injected with MAPCs （P 〈 0.05）. In addition, rats

关键词： adult progenitor cells transplantation neuronal differentiation brain ischemia rats