检索结果-南通市图书馆

MPI/OpenMP-Based Parallel Solver for Imprint Forming Simulation

Computer Modeling in Engineering & Sciences 2024年第7期140卷 461-483页

作者： Yang Li jiangping xu Yun Liu Wen Zhong Fei Wang School of Mechanical Engineering Jiangsu UniversityZhenjiang212016China School of Mechanical Engineering Wuhan Polytechnic UniversityWuhan430023China Shenyang Mint Company Limited Shenyang110092China

In this research,we present the pure open multi-processing(OpenMP),pure message passing interface(MPI),and hybrid MPI/OpenMP parallel solvers within the dynamic explicit central difference algorithm for the coining process to address the challenge of capturing fine relief features of approximately 50 *** such precision demands the utilization of at least 7 million tetrahedron elements,surpassing the capabilities of traditional serial programs previously *** mitigate data races when calculating internal forces,intermediate arrays are introduced within the OpenMP *** helps ensure proper synchronization and avoid conflicts during parallel ***,in the MPI implementation,the coins are partitioned into the desired number of *** division allows for efficient distribution of computational tasks across multiple *** simulation examples are conducted to compare the three solvers with serial programs,evaluating correctness,acceleration ratio,and parallel *** results reveal a relative error of approximately 0.3%in forming force among the parallel and serial solvers,while the predicted insufficient material zones align with experimental ***,speedup ratio and parallel efficiency are assessed for the coining process *** pureMPI parallel solver achieves a maximum acceleration of 9.5 on a single computer(utilizing 12 cores)and the hybrid solver exhibits a speedup ratio of 136 in a cluster(using 6 compute nodes and 12 cores per compute node),showing the strong scalability of the hybrid MPI/OpenMP programming *** approach effectively meets the simulation requirements for commemorative coins with intricate relief patterns.

关键词： Hybrid MPI/OpenMP parallel computing MPI OpenMP imprint forming

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chiral transfer-dictated self-assembly of chiral block copolymers

Aggregate

引用

Aggregate 2021年第5期2卷 132-150页

作者： Hao Li Bijin Xiong jiangping xu Jintao Zhu State Key Lab of Materials Processing and Die and Mould Technology Key Lab of Materials Chemistry for Energy Conversion and Storage(HUST)of Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)WuhanChina

Chiral structures not only exist in nature widely,they also emerge in artificial systems,attracting myriad attentions due to their excellent mechanical,optical,electrical,and magnetic ***-assembly of chiral block copolymers(BCPs*),where at least one block consists of chiral centers,represents a facile strategy to form helical/spiral/network structures with a controlled ***,morphological chirality of BCP*assemblies was closely associated with molecular and conformational chirality of the chiral ***,chiral assemblies arose from molecular chirality of BCPs*,transferring up in the assembly process and dictated the chirality at a higher hierarchical *** contrast,notwithstanding similar assemblies could be observed from achiral BCPs under certain conditions,both left-and right-handed ones were usually observed simultaneously without a ***,unique feature of BCPs*to access to controllable chiral assemblies affords an opportunity to prepare advanced functional ***,we dedicated a review on assembly of BCPs*into chiral assemblies in bulk/films,selective solvents,and confined *** chiral transfer process in these assembly scenarios were discussed and highlighted as a key contributor to morphological *** and representative applications of BCP*assemblies were also described,followed by present challenges and future prospects of BCP*self-assembly.

关键词： block copolymers chiral transfer chirality conﬁned assembly self-assembly

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Temperature/pH dual-responsive reversible morphology evolution of block copolymer microparticles under three-dimensional confinement

引用

Science China Chemistry 2023年第12期66卷 3587-3593页

作者： Mengmeng Zhang Zaiyan Hou Simeng Liu Guoqiang Han Meirong Tian Jintao Zhu jiangping xu Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Development of block copolymer(BCP)microparticles with switchable morphology in response to external stimuli is important for exploiting new intelligent *** this work,thermo/p H dual-responsive nanoparticles(NPs)were employed as a cosurfactant to modulate the self-assembly morphology of polystyrene-b-poly(2-vinylpyridine)(PS-b-P2VP)microparticles within confined emulsion *** co-surfactant was synthesized by grafting poly(acrylic acid)-b-poly(N-isopropylacrylamide)onto the surface of *** introduction of the dual-responsive co-surfactant enabled thermo/p H dual-responsive reversible morphology transition of the PS-b-P2VP microparticles by tailoring the hydrophobicity and interfacial affinity of the *** using this strategy,the thermo-inert PS-b-P2VP self-assembled into pupa-like microparticles at T=10℃ and p H7.5,which could transform into tulip-like microparticles when T was increased to 50℃.When the p H value was increased to 11,the pupa-like particles turned into onion-like microparticles although the PS-b-P2VP was inert to ***,the pupa-like microparticles remained unchanged when both T and p H were simultaneously *** PAA-b-PNIPAM-grafted Fe3O4NP surfactants showed obvious advantages over the linear PAA-b-PNIPAM surfactants in modulating the morphology transition,since the linear PAA-b-PNIPAM could not induce the reversible shape transition of *** work provides an efficient strategy to achieve reversible shape transformation of BCP microparticles while the internal phase structure is preserved,which may be utilized to switch the structural color properties of BCP microparticles.

关键词： block copolymer self-assembly stimuli-responsiveness lower critical solution temperature microparticle

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Neuroprotective effect of epigallocatechin-3-gallate on hemisection-induced spinal cord injury in rats

引用

Neural Regeneration Research 2011年第6期6卷 405-411页

作者： Fengjun Deng Rubing Li Yingbao Yang Dan Zhou Qian Wang jiangping xu Department of Pharmaceutical Sciences Hunan Yiyang Medical College Yiyang 413000 Hunan Province China Pharmaceutical Preparation Section General Hospital of Guangzhou Military Command of PLA Guangzhou 510010 Guangdong Province China Department of Pharmacology School of Pharmaceutical Sciences Southern Medical University Guangzhou 510515 Guangdong Province China Pingxiang Healthy School Pingxiang 337000 Jiangxi Province China

Epigallocatechin-3-gallate （EGCG）, a naturally occurring compound in green tea, has been widely used as an antioxidant agent. In the present study, model rats with acute spinal cord injury were intraperitoneally injected with 25, 50, and 100 mg/kg EGCG, and spinal cord ultrastructure, oxidative stress reaction, inflammatory factors, and apoptosis-associated gene expression were observed. Results showed that EGCG attenuated neuronal and axonal injury 24 hours post injury. It also decreased serum intedeukin-113, tumor necrosis factor-a, and intercellular adhesion molecule-1 release, and decreased apoptosis-associated gene expression. Furthermore, it increased the level of the superoxide anion （O2-）, superoxide dismutase, and B-cell lymphoma/leukemia-2, and reduced malondialdehyde levels. Furthermore, it reduced the expression of the pro-apoptotic protein Bax. Noticeably, EGCG at the 100 mg/kg dosage exhibited similar effects as methylprednisolone sodium succinate, which has been frequently used for clinical acute spinal cord injury. The results demonstrated that EGCG can significantly inhibit inflammation, suppress oxidation, and reduce apoptosis in acute spinal cord injury.

关键词： epigallocatechin-3-gallate spinal cord injury neuroprotective effect oxidative stress inflammation apoptosis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inhibition of phosphodiesterase 4 attenuates aquaporin 4 expression and astrocyte swelling following cerebral ischemia/reperfusion injury

引用

中国药理学与毒理学杂志 2023年第7期37卷 509-510页

作者： CHEN Kechun WANG Haitao xu jiangping Department of Neuropharmacology and Drug Discovery School of Pharmaceutical Sciences Southern Medical University

OBJECTIVE To investigate the role of PDE4 inhibition in astrocyte swelling caused by cerebral ischemic/reperfusion(I/R) injury and the molecular mechanisms. METHODS SD rats were subjected to 2 h of focal cerebral ischemia induced by middle cerebral artery occlusion/reperfusion(MCAO/R). Roflumilast(Roflu) was intraperitoneally injected 2 h after MCAO. At 24 h after reperfusion, a high-resolution MRI was performed and using the wet-dry weighting method to measure the water content. The oxygen-glucose deprivation/reoxygenation(OGD/R) model was established in primary astrocytes for2 h. After 24 h of reoxygenation, Cell MaskTMplasma membrane stain was used to label the plasma membrane to calculate cell volume. The protein expressions insides astrocytes and penumbra were detected by Western blotting. To investigate the role of Akt/Fox O3a in mediating the effect of Roflu on the expression of AQP4. The astrocytes were treated with an Akt inhibitor MK2206 before treatment with Roflu and the activation of Akt, the expression of AQP4 and cell volume were determined as described above. In addition, an IL-1β-stimulated cell model was established in astrocytes, the expression of AQP4and the activation of Akt/Fox O3a were detected by Western blotting. The change of AQP4 expression inside astrocytes and penumbra were visualized by immunofluorescence staining. RESULTS Roflu reduced MCAO/Rinduced water contents, the expression of AQP4 and the phsophorylation of Akt and Fox O3a in the brains of MCAO/R rats. Inhibition of PDE4 decreased the cell volume and the expression of AQP4 in primary astrocytes subjected to OGD/R. PDE4 inhibition activated Akt/Fox O3a, and inhibition of Akt by MK2206 blocked the protective effect of Roflu against OGD/R induced astrocyte swelling. PDE4B knocking down reduced the expression of AQP4, while PDE4B overexpression reversed the effect of PDE4B si RNA in astrocytes. Roflu exerted similar protective effect in IL-1β-cultured astrocytes,and importantly over

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

改进的5参数Barlat-Lian屈服准则

引用

华中科技大学学报（自然科学版） 2008年第1期36卷 129-132页

作者：柳玉起徐丹许江平华中科技大学材料成形与模具技术国家重点实验室武汉430074

在平面各向异性三参数Barlat-Lian屈服准则的基础上加入两个横向剪切应力分量xσz和σyz,提出了一个改进的5参数Barlat-Lian屈服准则,结合BT或BWC壳单元,模拟了板料在成形过程中的各向异性行为.当屈服函数指数M=2时,改进的Barlat-Lian... 详细信息

在平面各向异性三参数Barlat-Lian屈服准则的基础上加入两个横向剪切应力分量xσz和σyz,提出了一个改进的5参数Barlat-Lian屈服准则,结合BT或BWC壳单元,模拟了板料在成形过程中的各向异性行为.当屈服函数指数M=2时,改进的Barlat-Lian屈服准则可以退化成Hill48屈服准则,当各向异性参数r0=r45=r90=1时,可退化成Von Mises屈服准则.应用自主版权的板料冲压成形快速模拟软件FASTAMP,以圆筒件为例,将模拟结果与试验结果进行比较,验证了改进的Barlat-Lian屈服准则的正确性.

关键词：板料成形数值模拟各向异性参数屈服准则

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

C-reactive Protein Promotes Memory Deficits and β-Amyloid Plaque Formation in Early-stage AβPP/PS1 Transgenic Mice

C-reactive Protein Promotes Memory Deficits and β-Amyloid P...

引用

2013年全国老年性痴呆与相关疾病学术会议

作者： jiangping xu Bingtian Bi Yufang Cheng Huanbing Lin Department of Pharmacology School of Pharmaceutical SciencesSouthern Medical University

C-reactive protein(CRP) is associated with the risk of Alzheimer’s disease(AD) and progressive cognitive ***,the effects and related mechanisms of CRP in the early-stage pathogenesis of AD remain *** and neurochemical tests were performed to investigate the association between CRP and cognitive function and amyloid-P(A|3) deposition in early-stage *** object recognition test(ORT),the Morris water maze(MWM) test,and step-down passive avoidance(SDPA) were performed to evaluate learning and memory in 4-month-old Aβprecursor protein/presenilin 1(ApPP/PSl) transgenic(Tg) mice after 60-day ventricular administration of CRP,a CRP inhibitor,and artificial cerebrospinal fluid(aCSF).Ap deposition was measured by immunohistochemistry to elucidate the pathological mechanisms of CRP in early-stage *** of CRP attenuated the recognition index decline of ApPP/PSl Tg mice in the novel-ORT,reversed the increased escape latency during the acquisition trial,and the decreased duration and entries in the target quadrant in the probe trial,of the MWM test,and improved performance in the learning trials and 24 h retention test in *** contrast,infusing CRP significantly aggravated the learning and memory impairment of ApPP/PSl Tg mice. Notably,ApPP/PSl Tg mice that received l,6-bis(phosphocholine)-hexane(bis(PC)-H) exhibited decreased cerebral Aβplaques compared with Tg mice that received aCSF,whereas ApPP/PS 1 Tg mice that received CRP showed increased plaque *** results suggest that CRP is an important trigger in the early pathogenesis of AD;thus,early intervention targeting CRP appears to be a potential approach for AD treatment.

关键词： C-reactive protein Alzheimer’s disease AβPP/PS1 transgenic mice memory plaque burden

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

让生物科学史教育渗透于教学之中

引用

生物学通报 2010年第11期45卷 24-27页

作者：徐江平浙江省宁波中学浙江宁波315010

在高中生物学新课改全面铺开的大环境下,生物科学史对于培养学生的科学素养,提升生物学学习的内涵具有深远影响。生物史的学习可以激发学生学习情趣,让学生亲身感悟生物学探究的过程,进而增强对科学本质的认识,养成敢于思考、勤于探索... 详细信息

在高中生物学新课改全面铺开的大环境下,生物科学史对于培养学生的科学素养,提升生物学学习的内涵具有深远影响。生物史的学习可以激发学生学习情趣,让学生亲身感悟生物学探究的过程,进而增强对科学本质的认识,养成敢于思考、勤于探索的科学品性。回溯历史,关注现实,着眼未来,中学生物学教学必须有意、有机、有力地渗透科学人文精神教育,达到科学精神与人文精神的和谐统一。

关键词：科学史科学素养科学价值人文精神

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

改性壳聚糖的制备及对Cu2+ Pb2+的吸附研究

引用

离子交换与吸附 2007年第3期23卷 274-281页

作者：胡慧玲苏敏刚徐江萍新疆大学化学化工学院新疆环境保护科学研究院

用巯基乙酸作为巯基化剂,对壳聚糖进行改性,选择了巯基化的条件。实验表明,在浓度为188mg/L的铜溶液中,CTS-SH的最大吸附率达90.3%以上,吸附容量为27.76mg/g,在浓度为203mg/L的铅溶液中,对铅的最大吸附率达到99%以上,在浓度为1.015g/L... 详细信息

用巯基乙酸作为巯基化剂,对壳聚糖进行改性,选择了巯基化的条件。实验表明,在浓度为188mg/L的铜溶液中,CTS-SH的最大吸附率达90.3%以上,吸附容量为27.76mg/g,在浓度为203mg/L的铅溶液中,对铅的最大吸附率达到99%以上,在浓度为1.015g/L的铅溶液中,最大吸附率达95.5%。此时的吸附容量为97.4 mg/g,吸附容量大于147.2mg/g时的吸附率为36.3%。经XRD及EMS图片的分析,可以看出,改性壳聚糖在吸附前后,结构发生了改变。

关键词：巯基化壳聚糖铜铅吸附

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

气相色谱-质谱联用检测稻田水中的双甲脒农药残留

引用

化学通报 2014年第1期77卷 90-92页

作者：郭璟琦许江萍郭浩重庆市公安局物证鉴定中心重庆400021

建立了用于检测稻田水中双甲脒农药残留的液液萃取／气质联用方法。使用GC—MS选择离子监测模式检测，考察了不同的提取溶剂和pH对检测结果的影响。在优化条件下，双甲脒在20～2000ng／mL范围内具有良好的线性关系，相关系数为0．9991... 详细信息

建立了用于检测稻田水中双甲脒农药残留的液液萃取／气质联用方法。使用GC—MS选择离子监测模式检测，考察了不同的提取溶剂和pH对检测结果的影响。在优化条件下，双甲脒在20～2000ng／mL范围内具有良好的线性关系，相关系数为0．9991，平均回收率为86．7％，精密度（n=5）为5．3％，检出限为10ng／mL。该方法快速、灵敏、准确，可用于稻田水中双甲脒的定性定量分析检验。

关键词：液液萃取气质联用仪双甲脒农药残留稻田水

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：