检索结果-南通市图书馆

Remediation of Cu Contaminated Soil by Fe_(78)Si_(9)B_(13)^(AP)Permeability Reaction Barrier Combined with Electrokinetic Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第6期11卷 2969-2983页

作者： Liefei pei xiangyun Zhang Zizhou Yuan School of Materials Science and Engineering Lanzhou University of TechnologyLanzhouChina School of Mining and Metallurgy Engineering Baiyin Mining and Metallurgy Vocational and Technical CollegeBaiyinChina

Iron-based amorphous crystalline powder Fe_(78)Si_(9)B_(13)^(AP)is used as a permeability reaction barrier(PRB)combined with an electrokinetic method(EK-PRB)to study the removal rate of Cu in contaminated *** treating Cucontaminated soil for 5 days under different voltage gradients and soil water content,the soil pH is between 3.1 and *** increase of voltage gradient and soil water content can effectively promote the movement of Cu^(2+) to the *** voltage gradient is 3 V/cm,and the water content of 40%is considered to be an optional experimental ***,under this condition,the effects of Fe_(78)Si_(9)B_(13)^(AP)and zero-valent iron(ZVI)as PRB on the removal rate of total Cu in soil and the transformation of chemical forms of Cu are *** with ZVI,Fe_(78)Si_(9)B_(13)^(AP)as PRB has a better remediation ***-Fe_(78)Si_(9)B_(13)^(AP)can remove 80.3%of total Cu in soil,and the biologically available Cu is reduced to 3.6%,which effectively reduces the environmental risk of contaminated soil.

关键词： Soil contamination amorphous alloy electrokinetic method immobilization

Evolution of dark energy–dark matter-coupled expanding universe

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第33期59卷 4473-4477页

作者： Ti-pei Li Mei Wu Department of Physics Center for Astrophysics Tsinghua University Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences

The present universe is dominated by repulsive dark energy. It is natural that the coupling between the dark energy and the attractive gravity has to be taken into account in studying the evolution of our universe. Here, we induce an evolution equation for dark energy–dark mattercoupled universe. The solutions of the dynamic equation provide a specific picture of cosmic evolution, which is well compatible with current observed evolution histories of both Hubble parameter and equation of state parameter of dark energy. In this picture, the already observed universe has undergone through three epochs—the epoch of equilibrium between gravity and dark energy at cosmological redshifts z [ 1, the phase transition epoch at z between about 0.5 and 1, and the present acceleration epoch starting from z ' 0:5. The expected matter-dominated deceleration epoch has not been seen yet, which requires future deep observations to look back upon more early universe.

关键词：膨胀宇宙暗能量耦合暗物质演变演化方程动力学方程吸引力

A High-Accurate Fast Poisson Solver Based on Harmonic SurfaceMapping Algorithm

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2021年第6期30卷 210-226页

作者： Jiuyang Liang pei Liu Zhenli Xu School of Mathematical Sciences Institute of Natural Sciencesand MOE-LSCShanghai Jiao Tong UniversityShanghai 200240China School of Mathematics University of MinnesotaTwin CitiesMinneapolisMN 55455USA

Poisson’s equations in a cuboid are frequently solved in many scientific and engineering applications such as electric structure calculations,molecular dynamics simulations and computational *** this paper,a fast and highly accurate algorithm is presented for the solution of the Poisson’s equation in a cuboidal domain with boundary conditions of mixed *** so-called harmonic surface mapping algorithm is a meshless algorithm which can achieve a desired order of accuracy by evaluating a body convolution of the source and the free-spaceGreen’s function within a sphere containing the cuboid,and another surface integration over the spherical *** quadratures are introduced to approximate the integrals,resulting in the solution represented by a summation of point sources in free space,which can be accelerated by means of the fast multipole *** complexity of the algorithm is linear to the number of quadrature points,and the convergence rate can be arbitrarily high even when the source term is a piecewise continuous function.

关键词： Fast algorithm Poisson’s equation boundary integral method image charge mixed boundary condition fast multipole method

Neural Explainable Recommender Model Based on Attributes and Reviews

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2020年第6期35卷 1446-1460页

作者： Yu-Yao Liu Bo Yang Hong-Bin pei Jing Huang Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun 130012China College of Computer Science and Technology Jilin UniversityChangchun 130012China

Explainable recommendation, which can provide reasonable explanations for recommendations, is increasingly important in many fields. Although traditional embedding-based models can learn many implicit features, resulting in good performance, they cannot provide the reason for their recommendations. Existing explainable recommender methods can be mainly divided into two types. The first type models highlight reviews written by users to provide an explanation. For the second type, attribute information is taken into consideration. These approaches only consider one aspect and do not make the best use of the existing information. In this paper, we propose a novel neural explainable recommender model based on attributes and reviews (NERAR) for recommendation that combines the processing of attribute features and review features. We employ a tree-based model to extract and learn attribute features from auxiliary information, and then we use a time-aware gated recurrent unit (T-GRU) to model user review features and process item review features based on a convolutional neural network (CNN). Extensive experiments on Amazon datasets demonstrate that our model outperforms the state-of-the-art recommendation models in accuracy of recommendations. The presented examples also show that our model can offer more reasonable explanations. Crowd-sourcing based evaluations are conducted to verify our model's superiority in explainability.

关键词： recommender system explainable recommendation review usefulness attribute usefulness

Safeguarding China＇s Botanical Heritage ---BGCI＇s integrated conservation programme in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

植物分类与资源学报 2011年第1期33卷 80-84页

作者： xiang-Ying WEN Joachim GRATZFELD Sheng-Ji pei China Program Office Botanic Gardens Conservation International Guangzhou 510520 China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China

China's rich floral diversity includes more than 33 000 vascular plant species, representing approximately 10 percent of all known plant species. Over half of these species are endemic to China. However, China's rapid economic development in the last 30 years and continuous population growth have seriously damaged plant resources in the wild and the ecological environment, resulting in a dramatic increase in the number of endangered species. There are nearly 4 000 to 5 000 higher plants that are now threatened or on the verge of extinction. To help halt the loss of Chinese plant diversity, Botanic Gardens Conservation International(BGCI) has developed a China programme and opened its first office based in Guangzhou in 2008. This office works along with Chinese partners aiming to secure Chinese plant diversity through integrated conservation approaches with reintroduction/population reinforcement, engagement of local communities in conservation activities, capacity building in horticulture and environmental education and public outreach

关键词： Integrated conservation Capacity building Reintroduction Environmental education Public outreach

关节镜下双缝线Y字型固定前交叉韧带止点撕脱骨折的疗效观察

在线全文

学校读者我要写书评

暂无评论

创伤外科杂志 2024年第10期26卷 751-756页

作者：裴杰王青郭敦明宋黄鹤常州市中医医院江苏常州213000 江苏省人民医院南京210000

目的探讨关节镜下双缝线Y字型固定前交叉韧带止点撕脱骨折的手术技术及临床疗效。方法回顾性分析2018年1月—2021年12月江苏省人民医院行关节镜下双缝线Y字型固定前交叉韧带止点撕脱骨折患者30例,男性19例,女性11例;年龄27~56岁,平均36.... 详细信息

目的探讨关节镜下双缝线Y字型固定前交叉韧带止点撕脱骨折的手术技术及临床疗效。方法回顾性分析2018年1月—2021年12月江苏省人民医院行关节镜下双缝线Y字型固定前交叉韧带止点撕脱骨折患者30例,男性19例,女性11例;年龄27~56岁,平均36.8岁。术后采用VAS及Lysholm评分评定疗效,CT检查评估骨折愈合情况。结果随访18~31个月,平均24.6个月。患者术前VAS(7.3±1.3)分,术后1个月评分较术前降低,以后每个复查时间点(术后6、12个月)较术前均显著减低,末次随访时为(0.5±0.5)分,差异均有统计学意义(P<0.05)。术前Lysholm评分(45.4±7.6)分,术后1个月时(66.3±4.6)分无明显增高,但术后6及12个月时显著增加,分别为(85.1±5.3)分、(92.4±2.4)分,与较术前比较差异有统计学意义(P<0.05)。患者术后12个月复查CT,结果显示均达到骨性愈合。末次随访(12个月后)时,前抽屉试验和Lachman试验均为阴性。结论关节镜下双缝线Y字型固定前交叉韧带止点撕脱骨折,手术技术成熟简便,临床效果显著,是治疗移位前交叉韧带撕脱骨折的有效方法。

关键词：前交叉韧带撕脱骨折缝线固定关节镜

在线全文

学校读者我要写书评

暂无评论

牡丹PsAP3基因的克隆与表达分析

植物生理学报 2024年第1期60卷 141-154页

作者：周佩刘燕柴梦娟李韶文张驰栗燕李永华逯久幸河南农业大学风景园林与艺术学院郑州450002 河南省优质花卉蔬菜种苗工程技术中心郑州450002

优质牡丹花型育种是牡丹产业发展遭遇的瓶颈问题之一。本研究以牡丹(Paeonia sufruticosa)单瓣和雄蕊瓣化品种为植物材料,以调控牡丹雄蕊发育相关的关键基因PsAP3为切入点,通过基因克隆、亚细胞定位、表达分析初步解析了牡丹PsAP3基因... 详细信息

优质牡丹花型育种是牡丹产业发展遭遇的瓶颈问题之一。本研究以牡丹(Paeonia sufruticosa)单瓣和雄蕊瓣化品种为植物材料,以调控牡丹雄蕊发育相关的关键基因PsAP3为切入点,通过基因克隆、亚细胞定位、表达分析初步解析了牡丹PsAP3基因的功能,筛选了PsAP3可能存在下游互作基因,构建了TRV2-PsAP3沉默载体并成功转化农杆菌,用于后续牡丹瞬时沉默试验。结果显示:牡丹PsAP3基因全长612 bp(GenBank登记号:MT225537),编码203个氨基酸,分子量为23891.18,属亲水蛋白,含有一个MADS结构域和一个K结构域。系统进化分析表明PsAP3与栓皮栎亲缘关系最近。亚细胞定位结果显示PsAP3蛋白定位在细胞核中。表达分析结果显示,与单瓣品种的雄蕊相比PsAP3在雄蕊瓣化品种的内瓣中表达量显著提高,这也预示着可能是PsAP3基因在在花器官中表达扩张,在雄蕊中显著高表达导致了牡丹的雄蕊瓣化现象。酵母双杂交结果表明PsAP3编码的蛋白与PsAP1-1、PsPI、PsSEP、PsAG编码的蛋白互作。本研究初步解析了牡丹PsAP3的功能,为牡丹雄蕊瓣化分子机理的揭示提供理论依据,并为进一步精细化调控牡丹花型奠定理论基础。

关键词： PsAP3克隆表达分析亚细胞定位载体构建酵母双杂交

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

Ⅱ型断裂韧度测试功能开发与试验分析

实验力学 2024年第1期39卷 34-42页

作者：卓莉裴建良刘怀忠肖明砾谢红强四川大学水利水电学院水力学与山区河流开发保护国家重点实验室四川成都610065

断裂韧度作为岩石的重要力学指标,对认识压剪破坏规律具有重要意义。为解决现有设备缺乏围压冲剪试验(PTS/CP)测试功能的问题,本文基于Ⅱ型断裂韧度测试方法进行试验装置开发,在现有设备上实现了PTS/CP测试功能,并通过青砂岩的PTS/CP试... 详细信息

断裂韧度作为岩石的重要力学指标,对认识压剪破坏规律具有重要意义。为解决现有设备缺乏围压冲剪试验(PTS/CP)测试功能的问题,本文基于Ⅱ型断裂韧度测试方法进行试验装置开发,在现有设备上实现了PTS/CP测试功能,并通过青砂岩的PTS/CP试验验证了开发装置的可靠性。青砂岩PTS/CP试验结果表明,在围压侧向约束条件下岩石试样可获得较理想的冲剪破坏面,且随着围压的增大,Ⅱ型断裂韧度K_(ⅡC)先增大后趋于稳定;通过PTS/CP试验所获得的青砂岩K_(ⅡC)与其单轴抗拉强度、I型断裂韧度指标之间的关系符合常规认识,说明了PTS/CP测试功能的合理性和装置的可操作性。PTS/CP测试功能的开发可为岩石及类似工程材料的相关教学和科研工作提供试验支撑。

关键词：围压冲剪试验测试功能开发 Ⅱ型断裂韧度压剪破坏

Advances in cell lineage reprogramming

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2013年第3期56卷 228-233页

作者： ZHOU JunNian YUE Wen pei XueTao Stem Cell and Regenerative Medicine Lab Beijing Institute of Transfusion Medicine

As a milestone breakthrough of stem cell and regenerative medicine in recent years, somatic cell reprogramming has opened up new applications of regenerative medicine by breaking through the ethical shackles of embryonic stern cells. However, induced pluripo- tent stem （iPS） cells are prepared with a complicated protocol that results in a low reprogramming rate. To obtain differentiated target cells, iPS cells and embryonic stem cells still need to be induced using step-by-step procedures. The safety of induced target cells from iPS cells is currently a further concerning matter. More broadly conceived is lineage reprogramming that has been investigated since 1987. Adult stem cell plasticity, which triggered interest in stem cell research at the end of the last century, can also be included in the scope of lineage reprogramming. With the promotion of iPS cell research, lineage reprogramming is now considered as one of the most promising fields in regenerative medicine, will hopefully lead to customized, personalized therapeutic options for patients in the future.

关键词： regenerative medicine lineage reprogramming transdifferentiation dedifferentiation transdetemination