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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 118-128页

作者： xiaoshuang li Dmitry Sukhomlinov Zaiqing Que Aerosint SA B-4040 HerstalBelgium Aalto University Department of Chemical and Metallurgical EngineeringEspoo 02150Finland VTT Technical Research Centre of Finland Espoo 02044Finland

Multi-material laser-based powder bed fusion (PBF-LB) allows manufacturing of parts with 3-dimensional gradient and additional functionality in a single step. This research focuses on the combination of thermally-conductive CuCr1Zr with hard M300 tool steel.Two interface configurations of M300 on CuCr1Zr and CuCr1Zr on M300 were investigated. Ultra-fine grains form at the interface due to the low mutual solubility of Cu and steel. The material mixing zone size is dependent on the configurations and tunable in the range of0.1–0.3 mm by introducing a separate set of parameters for the interface layers. Microcracks and pores mainly occur in the transition zone.Regardless of these defects, the thermal diffusivity of bimetallic parts with 50vol% of CuCr1Zr significantly increases by 70%–150%compared to pure M300. The thermal diffusivity of CuCr1Zr and the hardness of M300 steel can be enhanced simultaneously by applying the aging heat treatment.

关键词： multi-material additive manufacturing laser-based powder bed fusion thermal diffusivity dissimilar metals copper alloy

Fabricating UCNPs-AuNPs Fluorescent Probe for Sensitive Sensing Thiamphenicol

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Chemical Research in Chinese Universities 2022年第6期38卷 1453-1460页

作者： YI Jiaqi li xiaoshuang CUI Di HAN lixia JIANG Wei ZHANG Renguo NIU Na CHEN ligang Key Laboratory of Forest Plant Ecology College of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin150040P.R.China

A novel fluorescent probe has been constructed based on fluorescence resonance energy transfer(FRET)between upconversion nanomaterials(UCNPs)NaYF4:Yb,Er and gold nanoparticles(AuNPs).The fluorescent“off-on”switching was formed for the detection of thiamphenicol(TAP)in egg samples.The fluorescence of UCNPs can be quenched to a certain degree by AuNPs.After adding TAP,the AuNPs generated aggregation and the fluorescence of UCNPs was recovered.The synthesized amination UCNPs and AuNPs were characterized by Fourier transform infrared spectroscopy(FTIR),UV-Vis,X-ray diffraction(XRD),energy dispersive spectrometer(EDS),and transmission electron microscope(TEM)techniques for observation and confirmation.As a model target,the detection of TAP has two linear ranges in the buffer solution within 0.01–0.1µmol/L and 0.1–1µmol/L using this fluorescent probe.The detection limit was obtained to be 0.003µmol/L(S/N=3),which is favorable for trace analysis.The recovery of TAP from 98.2%to 105.3%was obtained,and the relative standard deviation(RSD)was from 2.5%to 4.3%.Furthermore,the method established in this study based on the UCNPs auto-low background fluorescence has high selectivity and strong ability to eliminate interference,which is beneficial to analyzing complex samples.

关键词： Upconversion nanomaterial Fluorescent switch Thiam-phenicol Fluorescence resonance energy transfer Egg analysis

综合性手术护理应用于急性脑出血颅内血肿清除术中的效果分析

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中国社区医师 2024年第15期40卷 107-109页

作者：李晓爽锦州医科大学附属第一医院辽宁锦州121000

目的:分析综合性手术护理应用于急性脑出血颅内血肿清除术中的效果。方法:选取2022年1月—2023年1月于锦州医科大学附属第一医院行急性脑出血颅内血肿清除术的患者85例作为研究对象,分为对照组(n=45)与观察组(n=40)。对照组实施传统手... 详细信息

目的:分析综合性手术护理应用于急性脑出血颅内血肿清除术中的效果。方法:选取2022年1月—2023年1月于锦州医科大学附属第一医院行急性脑出血颅内血肿清除术的患者85例作为研究对象,分为对照组(n=45)与观察组(n=40)。对照组实施传统手术室护理,观察组实施综合性手术护理。比较两组护理效果。结果:观察组手术时间短于对照组,术中出血量少于对照组,差异有统计学意义(P<0.001);干预后,两组生活质量、日常生活活动能力评分高于干预前,且观察组高于对照组,差异有统计学意义(P<0.05);观察组护理操作、服务态度、安全管理、环境卫生评分高于对照组,差异有统计学意义(P<0.001);观察组并发症总发生率低于对照组,差异有统计学意义(P=0.030)。结论:综合性手术护理应用于急性脑出血颅内血肿清除术中的效果显著,护理质量较高,能够缩短手术时间,减少术中出血量,改善患者生活质量,增强患者日常活动能力,降低并发症发生率,值得临床应用并予以推广。

关键词：急性脑出血颅内血肿清除术手术室护理

Influence of Layered Aluminoborophosphate on Flame Retardance, Crystallization Behaviors and Mechanical Properties of Polyamide 66 Systems

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Chemical Research in Chinese Universities 2016年第1期32卷 127-133页

作者： li xiaoshuang liU Yuan GUO Chaofeng liU Haiyang WANG Gang CAI Qiang YAO Youwei Institute of Advanced Materials Graduate School at Shenzhen Tsinghua University Shenzhen 518055 P. R. China State Key Laboratory of New Ceramic & Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 P. R. China

A layered aluminoborophosphate（LABP-DDA） was hydrothermally synthesized using dodecylamine as a structure-directing agent, and was added into polyamide 66（PA66） to obtain nanocomposites, PA66/LABP-DDA, via melt intercalation method. The characterization results of transmission electron microscopy（TEM） and small angle X-ray scattering （SAXS） indicate that LABP-DDA has been successfully exfoliated into nano-layers of PA66 matrix. The unstable γ phase of PA66 was found in the composites with the help of X-ray diffraction（XRD） and differential scanning calorimetry（DSC）. The heterogeneous nucleation effect of LABP-DDA resulted in an increasement of about 10 ℃ in melting temperature and an increasement of about 7% in crystallinity when compared with those of neat PA66. The introduction of LABP-DDA did not significantly affect the toughness and strength of PA66. The results of flammability test indicate that LABP-DDA possesses positive synergistic flame retarding effect in the presence of melamine polyphosphate（MPP） and the 77%PA66/（23-x）%MPP/x%LABP-DDA（x=1, 2） samples in thickness of 1.6 mm reached from Fail to V-1 rating based on UL94, compared with 77% PA66/23%MPE.

关键词： Layered phosphate Polyamide 66 Flame retardancy Nanocomposite

低本底α、β放射性测量中几何因子对探测效率的影响分析

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中国辐射卫生 2024年第2期33卷 183-188,202页

作者：李小双刘佳煜上海市计量测试技术研究院上海201203

目的研究对低本底α、β放射性测量仪计量时平面源活性区半径以及其中心与探测窗中心位置水平间距的变化对探测效率的影响。方法基于MATLAB对不同条件下的几何因子的数值计算,采用经溯源的平面源对常用的测量仪器进行实验分析。结果保... 详细信息

目的研究对低本底α、β放射性测量仪计量时平面源活性区半径以及其中心与探测窗中心位置水平间距的变化对探测效率的影响。方法基于MATLAB对不同条件下的几何因子的数值计算,采用经溯源的平面源对常用的测量仪器进行实验分析。结果保持其他参数不变,活性区半径R_(1)=9 mm时,G值最大;间距a=0 mm时,G值最大;按照检定规程计算公式,对于^(90)Sr-^(90)Y平面源,a最大时,FYFS-400X探测效率偏小1.2%,MPC-9604探测效率偏小3.2%;对于^(241)Am平面源,a最大时MPC-9604探测效率偏小1.9%。结论几何因子随着活性区半径、间距的增大而减小。在居中位置,几何因子对探测效率相对标准不确定度的影响更小。建议使用标准平面源对仪器计量时应该采取有效措施确保平面源始终处于样品盘的正中央位置。

关键词： α、β放射性立体角几何因子探测效率相对标准不确定度

基于断裂力学的浅埋工作面过沟谷地形上坡段切顶机理分析

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矿业研究与开发 2024年第4期44卷 97-106页

作者：杨登峰李小双马天辉谢生荣青岛理工大学理学院山东青岛市266520 常州大学城市建设学院江苏常州市213164 大连理工大学海岸和近海工程国家重点实验室辽宁大连市116024 中国矿业大学(北京)能源与矿业学院北京100083

浅埋煤层工作面推进至沟谷地形上坡段时,易出现关键层破断块体沿煤壁整体滑落失稳的大范围动载矿压灾害。根据沟谷上坡段顶板破断特征,基于断裂力学分析方法构建力学模型,探讨了顶板失稳的力学机理及基本顶破断失稳条件,获得了顶板来压... 详细信息

浅埋煤层工作面推进至沟谷地形上坡段时,易出现关键层破断块体沿煤壁整体滑落失稳的大范围动载矿压灾害。根据沟谷上坡段顶板破断特征,基于断裂力学分析方法构建力学模型,探讨了顶板失稳的力学机理及基本顶破断失稳条件,获得了顶板来压步距及支架工作阻力的计算公式,并对各关键致灾因素进行了分析。研究结果表明:随着工作面推进,基本顶损伤区裂纹尖端的集中应力和应力强度因子增大,当应力强度因子增大到临界值时,悬臂梁破断工作面来压;沟谷坡角大小对来压步距及支架工作阻力起主要作用,损伤区裂纹长度、基本顶厚度、断裂韧性等因素也对其有较大影响;通过在麻地梁煤矿2103工作面进行现场监测,对理论分析结果进行了验证,进一步分析了支架阻力的合理值。研究工作提高了工作面过沟谷地形上坡段顶板控制的准确性,能够有效促进矿井的安全生产。

关键词：浅埋煤层沟谷地形上坡段断裂力学支架工作阻力

骨肉瘤组织中GFRA1、FBN1表达水平及意义

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河北医药 2024年第2期46卷 223-226页

作者：张畅李小双廉凯徐进李晶湖北省武汉市黄陂区人民医院骨科 430300 湖北文理学院附属医院襄阳市中心医院骨科湖北文理学院附属医院襄阳市中心医院肿瘤科

目的探讨胶质细胞系源性神经营养因子受体1(GFRA1)、原纤维蛋白-1(FBN1)在骨肉瘤组织中表达水平及意义。方法收集2017年9月至2019年9月住院手术的66例骨肉瘤患者治疗精细切除骨肉瘤组织标本及癌旁组织标本,同时收集整理其临床分期、肿... 详细信息

目的探讨胶质细胞系源性神经营养因子受体1(GFRA1)、原纤维蛋白-1(FBN1)在骨肉瘤组织中表达水平及意义。方法收集2017年9月至2019年9月住院手术的66例骨肉瘤患者治疗精细切除骨肉瘤组织标本及癌旁组织标本,同时收集整理其临床分期、肿瘤直径、肿瘤分化程度等临床资料。采用免疫组织化学法检测GFRA1、FBN1蛋白表达;骨肉瘤组织GFRA1、FBN1表达与患者预后的关系采用Kaplan-Meier法分析;多因素Logistic回归分析骨肉瘤患者预后的影响因素。结果与癌旁组织相比,骨肉瘤组织中GFRA1、FBN1阳性表达率明显较高(P0.05);骨肉瘤组织GFRA1、FBN1阳性表达患者3年生存率低于FBN1阴性表达患者(P<0.05)。GFRA1、FBN1阳性表达、肿瘤转移、软组织浸润是骨肉瘤患者预后的独立危险因素(P<0.05)。结论GFRA1、FBN1的表达与骨肉瘤患者的临床病理特征及预后有关,可以作为骨肉瘤患者预后评估的指标。

关键词：骨肉瘤 GFRA1 FBN1 病理特征

Desiccation tolerance in bryophytes： the rehydration proteomes of Bryum argenteum provide insights into the resuscitation mechanism

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Journal of Arid Land 2018年第1期10卷 152-167页

作者： GAO Bei ZHANG Daoyuan li xiaoshuang YANG Honglan liANG Yuqing CHEN Moxian ZHANG Yuanming ZHANG Jianhua Andrew WOOD Key Laboratory of Biogeography and Bioresource in Arid Land Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China School of life Sciences and State Key Laboratory of Agrobiotechnology The Chinese University of Hong KongHong KongChina Department of Biology Faculty of ScienceHong Kong Baptist UniversityHong KongChina Department of Plant Biology Southern Illinois University-CarbondaleCarbondaleIL 62901-6509USA

Bryum argenteum Hedw. is a desiccation tolerant bryophyte and belongs to one of the most important components of the biological soil crusts （BSCs） found in the deserts of Central Asia. limited information is available on rehydration-responsive proteins in desiccation tolerant plants. As a complement to our previous research analyzing the rehydration transcriptome, we present a parallel quantitative proteomic effort to study rehydration-responsive proteins. Bryophyte gametophores were desiccated （Dry） and rehydrated for 2 h （R2） and 24 h （R24）. Proteins from Dry, R2 and R24 gametophores were labeled by isobaric tags for relative and absolute quantitation （iTRAQ） to determine the relative abundance of rehydration-responsive proteins. A total of 5503 non-redundant protein sequences were identified and 4772 （86.7%） protein sequences were annotated using Gene Ontology （GO） terms and Pfam classifications. Upon rehydration 239 proteins were elevated and 461 proteins were reduced as compared to the desiccated protein sample. Differentially up-regulated proteins were classified into a number of categories including reactive oxygen species scavenging enzymes, detoxifying enzymes, Late Embryogenesis Abundant （LEA） proteins, heat shock proteins, proteasome components and proteases, and photosynthesis and translation related proteins. Furthermore, the results of the correlation between transcriptome and proteome revealed the discordant changes in the expression between protein and mRNA.

关键词： desiccation tolerance B＊Tum Physcomitrellapatens proteome iTRAQ rehydration

Experimental study on instability mechanism and critical intensity of rainfall of high-steep rock slopes under unsaturated conditions

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International Journal of Mining Science and Technology 2023年第10期33卷 1243-1260页

作者： xiaoshuang li Qihang li Yunmin Wang Wei liu Di Hou Wenbo Zheng Xiong Zhang School of Urban Construction Changzhou UniversityChangzhou 213164China College of Civil Engineering Qilu Institute of TechnologyJinan 250200China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing 312000China School of Resources and Safety Engineering Chongqing UniversityChongqing 400044China Sinosteel Maanshan General Institute of Mining Research Co.LTD. Maanshan 243000China Guizhou Survey and Design Research Institute for Water Resources and Hydropower Guiyang 550001China School of Engineering University of Northern British ColumbiaPrince George V2K3V3Canada

Two critical factors,namely intense precipitation and intricate excavation,can trigger rock mass disasters in mining operations.In this study,an indoor rainfall system was developed to precisely regulate the flow and intensity of precipitation.A large-scale model experiment was conducted on a self-designed physical simulation experiment platform to investigate the failure and instability of high-steep rock slopes under unsaturated conditions.The real-time reproduction of the progressive failure process in high-steep rock slopes enabled the determination of the critical rainfall intensity and revealed the mechanism underlying slope instability.Experiment results indicated that rainfall may be the primary factor contributing to rock mass instability,while continuous pillar mining exacerbates the extent of rock mass failure.The critical failure stage of high-steep rock slopes occurs at a rainfall intensity of 40 mm/h,whereas a rainfall exceeding 50 mm can induce critical instability and precipitation reaching up to 60 mm will result in slope failure.The improved region growing segmentation method(IRGSM)was subsequently employed for image recognition of rock mass deformation in underground mines.Herein an error comparison with the simple linear iterative cluster(SliC)superpixel method and the original region growing segmentation method(ORGSM)showed that the average identification error in the X and Y directions by the method was reduced significantly(1.82%and 1.80%in IRGSM;4.70%and 6.26%in SliC;9.45%and 12.40%in ORGSM).Ultimately,the relationship between rainfall intensity and failure probability was analyzed using the Monte Carlo method.Moreover,the stability assessment criteria of rock slope under unsaturated condition were quantitatively and accurately evaluated.

关键词： Open-pit to underground mining Rock slope Rainfall infiltration Excavation unloading Similar physical model Image recognition

Rheological and physicomechanical properties of rod milling sand-based cemented paste backfill modified by sulfonated naphthalene formaldehyde condensate

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 225-235页

作者： Qinli Zhang Hao Wu Yan Feng Daolin Wang Huaibin Su xiaoshuang li School of Resource and Safety Engineering Central South UniversityChangsha 410083China School of Civil Engineering Shaoxing UniversityShaoxing 312000China

Rod milling sand(RMS)—a coarse sand aggregate—was recycled for cemented paste backfill(CPB)for the underground mined area at the Jinchuan nickel deposit,named rod milling sand-based cemented paste backfill(RCPB).The adverse effects of coarse particles on the transportation of CPB slurry through pipelines to underground stopes resulting in weakening of the stability of the backfill system are well known.Therefore,sulfonated naphthalene formaldehyde(SNF)condensate was used for the performance improvement of RCPB.The synergistic effect of solid content(SC),lime-to-sand ratio,and SNF dosage on the rheological and physicomechanical properties,including slump,yield stress,bleeding rate,uniaxial compressive strength(UCS),as well as mechanism analysis of RCPB,have been explored.The results indicate that the effect of SNF on RCPB performance is related to the SNF dosage,lime-to-sand ratio,and SC.The slump of fresh RCPB with 0.1wt%-0.5wt%SNF increased by 2.6%-26.2%,whereas the yield stress reduced by 4.1%-50.3%,indicating better workability and improved cohesiveness of the mix.The bleeding rate of fresh RCPB decreased first and then rose with the increase of SNF dosage,and the peak decrease was 67.67%.UCS of RCPB first increased and then decreased with the increase of SNF dosage.At the optimal SNF addition ratio of 0.3wt%,the UCS of RCPB curing for 7,14 and,28 d ages increased by 31.5%,28.4%,and 29.5%,respectively.The beneficial effects of SNF in enhancing the early UCS of RCPB have been corroborated.However,the later UCS increases at a slower rate.The research findings may guide the design and preparation of RCPB with adequate performance for practical applications.

关键词： rod milling sand sulfonated naphthalene formaldehyde condensate cemented paste backfill rheological properties physicomechanical properties