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Toughening Poly(lactic acid) with Imidazolium-based Elastomeric Ionomers

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Chinese Journal of Polymer Science 2018年第12期36卷 1342-1352页

作者： Lu Chen Kuan Hu Si-ting sun Hai jiang Dong Huang kun-Yu zhang Li Pan Yue-Sheng Li Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and Engineering Tianjin University Tianjin 300350 China School of Chemical Engineering and Technology Tianjin University Tianjin 300350 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China

Imidazolium-based elastomeric ionomers （i-BIIR） were facilely synthesized by ionically modified brominated poly（isobutylene-co-isoprene）（BIIR） with different alkyl chain imidazole and thoroughly explored as novel toughening agents for poly（lactic acid）（PLA）. The miscibility, thermal behavior, phase morphology and mechanical property of ionomers and blends were investigated through dynamic mechanical analyses （DMA）, differential scanning calorimetry （DSC）, scanning electron microscopy （SEM）, tensile and impact testing. DMA and SEM results showed that better compatibility between the PLA and i-BIIR was achieved compared to the PLA/unmodified BIIR elastomer. A remarkable improvement in ductility with an optimum elongation at break up to 235% was achieved for the PLA/i-BIIR blends with 1-dodecylimidazole alkyl chain （i-BIIR-12）, more than 10 times higher than that of pure PLA. The impact strengths of PLA were enhanced from 1.9 kJ/m2 to 4.1 k J/m2 for the PLA/10 wt% i-BIIR-12 blend. Toughening mechanism had been established by systematical analysis of the compatibility, intermolecular interaction and phase structures of the blends. Interracial cavitations initiated massive shear yielding of the PLA matrix owing to a suitable interfacial adhesion which played a key role in the enormous toughening effect in these blends. We believed that introducing imidazolium group into the BIIR elastomer was vital for the formation of a suitable interfacial adhesion.

关键词： Imidazolium-based ionomer Poly(lactic acid) Brominated poly(isobutylene-co-isoprene) Toughening Blend

Prediction model of end-point phosphorus content for BOF based on monotone-constrained BP neural network

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Journal of Iron and Steel Research International 2022年第5期29卷 751-760页

作者： Kai-xiao Zhou Wen-hui lin Jian-kun sun jiang-shan zhang De-zheng zhang Xiao-ming Feng Qing Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing100083China Xinyu Iron and Steel Co. Ltd.Xinyu338001JiangxiChina

Dephosphorization is essential content in the steelmaking process,and the process after the converter has no dephosphorization ***,phosphorus must be removed to the required level in the converter *** order to better control the end-point phosphorus content of basic oxygen furnace(BOF),a prediction model of end-point phosphorus content for BOF based on monotone-constrained backpropagation(BP)neural network was *** the theoretical analysis of the dephosphorization process,ten factors that affect the end-point phosphorus content were determined as the input variables of the *** correlations between influencing factors and end-point phosphorus content were determined as the constraint condition of the model.200 sets of data were used to verify the accuracy of the model,and the hit ratios in the range of±0.005%and±0.003%are 94%and 74%,*** fit coefficient of determination of the predicted value and the actual value is 0.8456,and the root-mean-square error is 0.0030;the predictive accuracy is better than that of ordinary BP neural network,and this model has good *** can provide useful reference for real production and also provide a new approach for metallurgical predictive modeling.

关键词： Converter End-point phosphorus content Monotonic constraint BP neural network Prediction model Steelmaking

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圈养珍稀鹤类长疟原虫流行情况研究

野生动物学报 2024年第2期45卷 347-353页

作者：蒋鹏郑常明姜瑞婕杜余礼卢岩刘燕张增帅赵京孙冬婷赵素芬贾婷北京动物园圈养野生动物技术北京市重点实验室北京100044

2017—2021年,收集5家饲养单位12种圈养珍稀鹤类的284份样品进行血孢子虫病的流行调查。采用血孢子虫细胞色素b(Cyt b)基因套式PCR检测和Blast序列比对,结果显示:血孢子虫基因序列与已知长疟原虫(Plasmodium elongatum)DENVID02进化支... 详细信息

2017—2021年,收集5家饲养单位12种圈养珍稀鹤类的284份样品进行血孢子虫病的流行调查。采用血孢子虫细胞色素b(Cyt b)基因套式PCR检测和Blast序列比对,结果显示:血孢子虫基因序列与已知长疟原虫(Plasmodium elongatum)DENVID02进化支匹配度达到100%;结合虫体形态学,确定该寄生虫所属类群为长疟原虫。长疟原虫在黑颈鹤(Grus nigricollis)、白鹤(Leucogeranus leucogeranus)、丹顶鹤(Grus japonensis)、白头鹤(***)、灰鹤(***)和白枕鹤(Antigone vipio)6种鹤类中被检出,检出率为8.45%(24/284)。此外,感染长疟原虫DENVID02进化支的鹤类个体未出现明显的临床症状,所有感染个体均未采取防治措施。在跟踪监测中,发现病原体在鹤类体内消失或呈跨年度携带现象,推测鹤类可能对长疟原虫DENVID02具有先天抵抗力。

关键词：珍稀鹤类长疟原虫流行疾病防控

基于中西医临床病证特点的孤独症谱系障碍动物模型评价

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中国实验方剂学杂志 2024年第9期30卷 202-210页

作者：张亚同赵书艺杨莉斌姜汕孙佳鑫戎萍天津中医药大学第一附属医院国家中医针灸临床医学研究中心天津300381

目的:立足于动物模型评价新方法,对现有孤独症谱系障碍(ASD)动物模型的中西医病证特点进行归纳分析,提出改进建议。方法:检索中国知识基础设施工程(CNKI)及PubMed中ASD动物模型的相关文献,参照中西医诊断标准,对核心症状、伴随症状分别... 详细信息

目的:立足于动物模型评价新方法,对现有孤独症谱系障碍(ASD)动物模型的中西医病证特点进行归纳分析,提出改进建议。方法:检索中国知识基础设施工程(CNKI)及PubMed中ASD动物模型的相关文献,参照中西医诊断标准,对核心症状、伴随症状分别赋值,综合评价模型的临床吻合度。结果:ASD模型实验动物的选择以啮齿类居多,造模方法包括遗传和非遗传两大类,国内研究以生化诱导为主,国外研究以遗传模型更为常见,所有模型中以丙戊酸诱导临床吻合度最高,其次是神经连接蛋白4(NLGN4)、接触蛋白关联蛋白样蛋白2(CNTNAP2)基因敲除模型,大多数造模方法可满足表面有效性及结构有效性特点,但未对中医证候做明确区分,目前尚未有任何一种模型同时具备较高的中西医临床吻合度。结论:现有ASD动物模型多在西医指导下构建,缺乏中医证候特征,西医评价指标的选择较为单一,未明确中医证候类型。建议模型制备过程中施加中医干预因素,完善中西医评价指标,重视非人灵长类动物的研究,为今后实验的开展奠定坚实基础。

关键词：孤独症谱系障碍病证特点模型评价中西医结合行为学神经连接蛋白4(NLGN4) 接触蛋白关联蛋白样蛋白2(CNTNAP2)

Experimental investigation on anti-penetration performance of polyurea-coated ASTM1045 steel plate subjected to projectile impact

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Defence Technology（防务技术） 2021年第4期17卷 1496-1513页

作者： Yu-xiang sun Xin Wang Chong Ji Chang-xiao zhao Pei-li Liu Lei Meng kun zhang Tao jiang College of Field Engineering Army Engineering University of PLANanjing210007JiangsuChina Qingdao Advanced Marine Material Technology Co. LtdQingdao266000ShandongChina Department of International Training Army Engineering University of PLANanjing210042JiangsuChina

In this study,the anti-penetration performance of polyurea/ASTM1405-steel composite plate subjected to high velocity projectile was *** kinds of modified polyurea material(AMMT-053 and AMMT-055)were selected and a ballistic impact testing system including speed measuring target system and high-speed camera was *** experiment was conducted with a rifle and 5.8 mm projectile to explore the effects by the polyurea coating thickness,the polyurea coating position and the glass-fiber cloth on the anti-penetration performance of polyurea/ASTM1405-steel composite *** result showed that the effects of polyurea coating position were different between two types of polyurea,and that the effects of glass-fiber position were disparate between two types of polyurea as *** AMMT-053 polyurea material,it was better to be on front face than on rear face;whereas for AMMT-055 polyurea,it was better to be on rear surface although the difference was very ***,formulas had been given to describe the relationship between the effectiveness of polyurea and the thickness of polyurea *** general,AMMT-055 had better anti-penetration performance than ***,five typical damage modes including self-healing,crack,local bulge,spallation and local fragmentation were defined and the failure mechanism was analyzed with the results of SHPB ***,the bonding strength played an important role in the anti-penetration performance of polyurea/steel composite plate.

关键词： Polyurea ASTM1045 steel plate High velocity impact Penetration SHPB test Damage mechanism

FRACTAL DIMENSION OF TIME SERIES APPLIED TO IDENTIFICATION OF CRITICAL SPEED OF JEFFCOTT ROTOR SYSTEM

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Chinese Journal of Mechanical Engineering 2005年第3期18卷 446-448页

作者： zhao Yucheng sun kun zhang Yahong Xu Qingyu School of Civil Engineering and Mechanics Xi＇an Jiaotong University Xi＇an 710049 China School of Material Engineering Xi＇an Jiaotong University Xi＇an 710049 China

The dynamical behaviors of logistic map（May＇s model） and duffing equation are studied through fractal dimension of time series at different parameters. It is shown that the parameters of dynamical behaviors can be identified effectively by the curve of fractal dimension with parameter increments. For further verification, the relation between the fractional dimension of time series and rotational speed can be used to identify critical speed effectively by using this method to a plate Jeffoctt rotor system. The numerical and experimental result indicates that the identification of critical parameters is effective.

关键词： Fractal dimension Rotor system Critical speed

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小水电集约化运维管理三方演化博弈研究

中国农村水利水电 2024年第8期 200-207页

作者：江新邱国坤杨尚取陈婧赵力张腾飞三峡大学水利与环境学院湖北宜昌443002 中国电建集团成都勘测设计研究院有限公司四川成都610072

“双碳”背景下,为推进小水电集约化运维管理,保证其高质量发展。基于演化博弈理论,构建小水电业主、政府与运维服务企业之间的三方博弈模型,并运用Matlab软件进行数值仿真分析,以探究小水电集约化运维管理三方策略选择的演化路径。结... 详细信息

“双碳”背景下,为推进小水电集约化运维管理,保证其高质量发展。基于演化博弈理论,构建小水电业主、政府与运维服务企业之间的三方博弈模型,并运用Matlab软件进行数值仿真分析,以探究小水电集约化运维管理三方策略选择的演化路径。结果表明:初始策略的变化对博弈三方演化收敛速度有显著影响;在一定条件下,博弈系统将演化稳定于较理想的均衡状态(1,0,1);运维成本效益、政府奖惩力度、运维平台智慧度和方案收费系数是影响小水电实现集约化运维管理的主要因素。研究结论可为小水电业主参与集约化运维管理和政府制定相关政策提供一定的理论指导。

关键词：小水电站集约化运维管理三方演化博弈 Matlab仿真

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单侧额窦入路DrafⅢ借道引流术

临床耳鼻咽喉头颈外科杂志 2024年第8期38卷 726-731页

作者：蒋晓文赵可庆张焕康薛凯刘全顾晔郑实兴孙希才余洪猛复旦大学附属眼耳鼻喉科医院耳鼻咽喉科上海200031 复旦大学附属眼耳鼻喉科医院神经外科中国医学科学院内镜下鼻颅底肿瘤外科治疗技术创新单元(2018RU003) 华中科技大学协和深圳医院耳鼻咽喉科广东深圳518052

目的:患侧额窦的引流通道解剖变异或瘢痕闭锁,经患侧额窦引流通道开放额窦,可能会导致手术失败。本研究拟探索一种借健侧额窦和额隐窝为通路,磨除额窦底壁及额窦间隔,连通双侧额窦的改良DrafⅢ手术术式,完成患侧额窦的引流。方法:通过对... 详细信息

目的:患侧额窦的引流通道解剖变异或瘢痕闭锁,经患侧额窦引流通道开放额窦,可能会导致手术失败。本研究拟探索一种借健侧额窦和额隐窝为通路,磨除额窦底壁及额窦间隔,连通双侧额窦的改良DrafⅢ手术术式,完成患侧额窦的引流。方法:通过对2个头颅骨性标本和2个新鲜冷冻标本的解剖研究,探索手术相关标志及手术路径。回顾性分析4例采用此术式进行治疗的患者。记录患者的相关临床资料,探讨该术式的技术细节和优缺点。结果:通过2例头颅解剖研究,确认手术路径,借健侧额窦和额隐窝为通路,磨除双侧额窦底壁和额窦间隔,将双侧额窦在鼻中隔上方扩大成为一个大的共同腔,完成患侧额窦在健侧鼻腔的中线引流。4例患者因单侧额窦乳头状瘤行DrafⅡb手术,术后发生额窦闭锁、额窦炎,遂采用DrafⅢ借道引流术进行治疗。术后患者头痛症状消失,内镜下检查额窦引流口宽敞、黏膜愈合良好、引流通畅,无其他术后并发症。结论:单侧额窦入路DrafⅢ借道引流术能充分引流患侧额窦。该术式创伤小,成功率高,有临床应用价值,适合单侧DrafⅡb手术失败的患者。

关键词： DrafⅢ 上颌骨额突额鼻嵴单侧额窦

深度学习图像重建算法在门静脉CT血管成像中的应用研究

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中华放射学杂志 2024年第6期58卷 653-660页

作者：张悦蒋伟郭月飞郭焯欣张可马昆孟占鳌中山大学附属第三医院放射科广州510630 通用电气医疗中国CT影像研究中心广州510623

目的探讨深度学习图像重建(DLIR)在100 kV门静脉CT血管成像(CTPV)降低辐射剂量且提高图像质量的可行性,并与传统120 kV CTPV进行图像质量比较。方法前瞻性纳入中山大学附属第三医院2021年6月至2022年12月行上腹部CTPV检查的患者,分为120... 详细信息

目的探讨深度学习图像重建(DLIR)在100 kV门静脉CT血管成像(CTPV)降低辐射剂量且提高图像质量的可行性,并与传统120 kV CTPV进行图像质量比较。方法前瞻性纳入中山大学附属第三医院2021年6月至2022年12月行上腹部CTPV检查的患者,分为120 kV标准剂量组(S组)和100 kV低剂量组(L组)。S组采用自适应统计迭代-Veo算法(ASIR-V)及中等强度的DLIR(S-DM)进行重建,ASIR-V的权重分别采用40%、60%和80%(S-AV40、S-AV60和S-AV80)。L组采用60%和80%2种权重的ASIR-V(L-AV60和L-AV80)和中、高强度的DLIR(L-DM和L-DH)进行重建。2名医师分别进行客观指标测量,包括门静脉主干(MPV)、门静脉右支(RPV)、门静脉左支(LPV)、肝实质和右侧竖脊肌的CT值和SD值,并且计算信噪比(SNR)和对比噪声比(CNR)。3名医师分别对8组图像进行5分盲法评价。记录两组容积CT剂量指数(CTDIvol)和剂量长度乘积(DLP),计算有效剂量(ED)。采用单因素方差分析对客观指标、Kruskal-Wallis H检验对主观评分进行统计分析。结果共纳入100例患者,标准剂量组(S组)和低剂量组(L组)各50例。L组的有效剂量比S组减少了51%。MPV、RPV、LPV的SD、SNR和CNR在8组图像之间差异有统计学意义(P值均0.05),但显著低于其余6组(P值均0.05)外,3支门静脉的SNR和CNR在L-DH组均高于其他组,差异具有统计学意义(P值均<0.001)。L-DH组的主观图像质量评分最高(4.61±0.16),除和S-DM组(4.31±0.19)外的其余6组差异均有统计学意义(P值均<0.001)。医师间的客观指标测量和主观图像质量评分均具有良好的一致性(ICC=0.584~0.960)。结论与常规120 kV CTPV相比,100 kV结合DLIR算法可显著降低CTPV 51%的辐射剂量,并在降低噪声的同时保持更高的SNR、CNR和主观评分。高强度DLIR算法获得的100 kV CTPV图像质量最佳。

关键词：体层摄影术,X线计算机自适应统计迭代重建-Veo 深度学习图像重建门静脉CT血管成像辐射剂量