摘要：Mesh parameterization is one of the fundamental operations in computer graphics(CG) and computeraided design(CAD). In this paper, we propose a novel local/global parameterization approach, ARAP++, for singleand multi-boundary triangular meshes. It is an extension of the as-rigid-as-possible(ARAP) approach, which stitches together 1-ring patches instead of individual triangles. To optimize the spring energy, we introduce a linear iterative scheme which employs convex combination weights and a fitting Jacobian matrix corresponding to a prescribed family of transformations. Our algorithm is simple, efficient, and robust. The geometric properties(angle and area)of the original model can also be preserved by appropriately prescribing the singular values of the fitting matrix. To reduce the area and stretch distortions for high-curvature models, a stretch operator is introduced. Numerical results demonstrate that ARAP++ outperforms several state-of-the-art methods in terms of controlling the distortions of angle, area, and stretch. Furthermore, it achieves a better visualization performance for several applications, such as texture mapping and surface remeshing.

摘要：流变参数是管道输送系统设计的基础,采用RST-SST型软固体流变仪进行尾矿浆体流变特性试验,确定了不同固相质量分数下尾矿浆体的屈服应力、黏度系数.当浆体固相质量分数大于70%后,屈服应力会随着固相含量的增加而显著上升.对矿浆进行剪切变稀试验发现,屈服应力可下降40.9%.针对不同尾矿浆体开展标准坍落度试验,当固相质量分数小于74%时,尾矿浆具有良好的流动性及较大的坍落度.利用得到的尾矿浆体的流变特性参数,进行了临界流速、摩阻损失的计算,为尾矿管道输送系统设计提供参考.

摘要：在基于构件-节点一体化设计优化出的多轴向铺层基础上,进一步探究了铺层(单轴向铺层UD、多轴向铺层MD1、单轴向和多轴向相邻铺层MD2及多轴向中混碳铺层BC)以及几何尺寸(端距和排距)对FRP拉挤方管螺栓节点抗拉性能的影响。试验结果表明,多轴向布(MD1和MD2)的加入使节点极限承载力提升50%以上,极限位移增大至2倍以上,极大改善了节点承载和节点延性。采用MD2铺层能够获得最大节点承载力;BC铺层没有提升节点承载力但使节点刚度增大了7%~30%。端距和排距对UD方管螺栓节点的破坏模式无明显影响,均呈现剪切或劈裂破坏模式。当端径比增加至4时,多轴向方管螺栓节点破坏模式开始或完全转变为延性挤压破坏;随着排距的增大,两孔共同挤压受力过程延长,实现了更高延性、更高承载力的节点性能。建议多轴向BFRP拉挤方管螺栓节点的端径比和排径比取为4以上。

摘要：铝合金材料具有导热率高、激光吸收率低的特性,若熔覆过程中熔池温度场梯度偏大,易形成Al_(2)O_(3)氧化膜、气孔、裂纹等缺陷。在Simufact Welding软件中针对2A14铝合金表面熔覆AlSi9Mg,运用双椭球热源模型开展数值模拟仿真,获取不同激光功率、扫描速率条件下温度场与应力场状况。经分析可知,随激光功率增大,熔池的峰值温度会相应升高;当冷却速度降低时,残余应力随之增大;而扫描速度增大会造成熔池温度与残余应力峰值均下降。依据分析结果确定工艺参数的实验表明,AlSi9Mg熔覆层从结合区至熔覆层表面,其组织形态呈现出从连续平面晶、树枝晶逐步向等轴晶转变的规律,熔覆层最终形成结构致密的冶金结合组织。

摘要：为探讨不同类型的社会支持对欺凌应对的影响,以及求助意愿在其中起到的作用,采用3(支持来源:家庭、教师、同伴)×2(支持内容:情感、工具)×2(求助意愿:高、低)的被试间设计,对900名初中生进行调查。结果表明:(1)青少年获得的工具支持和教师支持越高,欺凌应对的能力越强;(2)求助意愿在不同社会支持对欺凌应对的影响中起调节作用。提供有针对性的社会支持有助于青少年校园欺凌应对能力的提升,为干预和减少校园欺凌提供了借鉴。

摘要：High-speed high-resolution analog-to-digital （A/D） conversion demanded by ultra wideband （UWB） signal processing is a very challenging problem. This paper proposes a parallel random projection method for UWB signal acquisition. The proposed method can achieve high sampling rate, high resolution and technical feasibility of hardware implementation. In the proposed method, an analog UWB signal is projected over a set of random sign functions. Then the low-rate high-resolution analog-to-digital convertors （ADCs） are used to sample the projection coefficients. The signal can be reconstructed by simple linear calculation with the sampling matrix, without complying with optimization algorithm and prior knowledge. In other aspects, unlike other approaches that need to utilize an accurate time-shift at extremely high frequency, or design a hybrid filter bank, or generate specific basis functions or work for signals with prior knowledge, the proposed method is a universal sampling approach and easy to apply. The simulation results of signal to noise ratio （SNR） and spurious-free dynamic range （SFDR） validate the efficiency of the proposed method for UWB signal acquisition.

摘要：Based on the antiplatelet aggregation mechanism and the bioisosterism principle of the reference drug picotamide, thirteen novel derivatives of arylamide and arylsulfonamide were designed and prepared. The biological activities of these derivatives were investigated. The chemical structures of the target compounds were confirmed by ^1H NMR and IR. The in vitro activities of antiplatelet aggregation of the thirteen target compounds were assessed by Bore＇s method. Compounds 2b and 8h have significant antiplatelet aggregation activities, which are superior to the corresponding activity of Picotamide.

摘要：The Accelerator Driven Sub-critical(ADS)system is a strategic plan to solve the nuclear waste problem for nuclear power plants in ***-energy particle accelerators and colliders contain long strings of superconducting devices,superconducting radio frequency cavities,and magnets,which may require cooling by 2 K superfluid helium(HeliumⅡ).2 K superfluid helium cryogenic system has become a research hot spot in the field of superconducting *** this study,the ADS Injector-I 2 K cryogenic system is examined in *** cryogenic system scheme design,key equipment,and technology design,such as the 2 K Joule–Thomson(J–T)heat exchanger and cryomodules CM1+CM2 design,are examined,in addition to the commissioning and operation of the cryogenic *** ADS Injector-I 2 K cryogenic system is the first 100 W superfluid helium system designed and built independently in *** ADS proton beam reached 10 Me V at 10 m A in July 2016 and 10 Me V at 2 m A in continuous mode in January 2017 and has been operated reliably for over 15,000 h,proving that the design of ADS Injector-I 2 K cryogenic system,the key equipment,and technology research are reasonable,reliable,and meet the *** research into key technologies provides valuable engineering experience that can be helpful for future projects such as CI-ADS(China Initiative Accelerator-Driven System),SHINE(Shanghai High Repetition Rate XFEL and Extreme Light Facility),PAPS(Platform of Advanced Photon Source Technology),and CEPC(Circular Electron-Positron Collider),thereby developing national expertise in the field of superfluid helium cryogenic systems.

摘要：水稻主题公园完美融合了农业文化与现代科技,运用智能化农业管理系统、资源循环利用及再生能源技术,高效利用资源并致力于生态环境保护。凭借物联网、大数据与人工智能技术,水稻主题公园能精确把控水稻的灌溉、施肥及病虫害防治,从而大幅提升农业生产效率及稻米品质。雨水、雪融水被多功能收集系统高效收集并通过智能灌溉系统等被高效加以利用,是优化水资源可持续管理的有效途径。构建涵盖环境、经济、技术、管理等多维度的风险评估体系,辅以完善的环境监测、财务监控、风险预警及技术评估系统,配合科学管理流程,能使水稻主题公园迅速应对各类风险。水稻主题公园不仅为游客带来了科技体验与生态教育,更以其创新的循环利用模式及技术集成,为农业与旅游业的融合探索出了一条新路径,有力推动了生态文明与绿色发展。

摘要：An investigation into the effect of several novel well-designed guanidinium salt ionic liquids（GILs） on inhibitting tumor growth is described. The GILs which have longer alkyl chain（6-18 carbon atoms） exhibit the high cytotoxicity to Hela299, B16 and SMMC-7721 cells so as to inhibit their proliferation. The inhibitory effect of the most effective GILl2 is about 10-fold higher than that of MMC（a common chemotherapy drug in clinic）.