Electrocatalyst designs based on oxophilic foreign atoms are considered a promising approach for developing efficient pH-universal hydrogen evolution reaction(HER)electrocatalysts by overcoming the sluggish alkaline H...Electrocatalyst designs based on oxophilic foreign atoms are considered a promising approach for developing efficient pH-universal hydrogen evolution reaction(HER)electrocatalysts by overcoming the sluggish alkaline HER kinetics.Here,we design ternary transition metals-based nickel telluride(Mo WNi Te)catalysts consisting of high valence non-3d Mo and W metals and oxophilic Te as a first demonstration of non-precious heterogeneous electrocatalysts following the bifunctional mechanism.The Mo WNi Te showed excellent HER catalytic performance with overpotentials of 72,125,and 182 mV to reach the current densities of 10,100,and 1000 mA cm^(-2),respectively,and the corresponding Tafel slope of 47,52,and 58 mV dec-1in alkaline media,which is much superior to commercial Pt/C.Additionally,the HER performance of Mo WNi Te is well maintained up to 3000 h at the current density of 100 mA cm^(-2).It is further demonstrated that the Mo WNi Te exhibits remarkable HER activities with an overpotential of 45 mV(31 mV)and Tafel slope of 60 mV dec-1(34 mV dec-1)at 10 mA cm^(-2)in neutral(acid)media.The superior HER performance of Mo WNi Te is attributed to the electronic structure modulation,inducing highly active low valence states by the incorporation of high valence non-3d transition metals.It is also attributed to the oxophilic effect of Te,accelerating water dissociation kinetics through a bifunctional catalytic mechanism in alkaline media.Density functional theory calculations further reveal that such synergistic effects lead to reduced free energy for an efficient water dissociation process,resulting in remarkable HER catalytic performances within universal pH environments.展开更多
Cycloaddition of CO_(2) and epoxide into cyclic carbonate is one of the most efficient ways for CO_(2) conversion with 100% atom-utilization. Metal–organic frameworks are a kind of potential heterogeneous catalysts, ...Cycloaddition of CO_(2) and epoxide into cyclic carbonate is one of the most efficient ways for CO_(2) conversion with 100% atom-utilization. Metal–organic frameworks are a kind of potential heterogeneous catalysts, however, high temperature, high pressure, and high-purity CO_(2) are still required for the reaction.Here, we report two new Zn(Ⅱ) imidazolate frameworks incoporating MoO_(4)^(2–)or WO_(4)^(2–)units, which can catalyse cycloaddition of CO_(2) and epichlorohydrin at room temperature and atomospheric pressure, giving 95% yield after 24 h in pure CO_(2) and 98% yield after 48 h in simulated flue gas(15% CO_(2)+ 85% N_(2)),respectively. For comparison, the analogic Zn(Ⅱ) imidazolate framework MAF-6 without non-3d metal oxide units showed 71% and 33% yields under the same conditions, respectively. The insightful modulation mechanisms of the MoO_(4)^(2–)unit in optimizing the electronic structure of Zn(Ⅱ) centre, facilitating the rate-determined ring opening process, and minimizing the reaction activation energy, were revealed by X-ray photoelectron spectroscopy, temperature programmed desorption and computational calculations.展开更多
目的:探究3D单孔胸腔镜在非小细胞肺癌(NSCLC)手术中的应用效果及对患者术后恢复的影响。方法:选取2022年8月—2024年8月南通市肿瘤医院行NSCLC手术的150例患者,依据手术方式分为研究组(n=78)和对照组(n=72)。对照组采用2D单孔胸腔镜手...目的:探究3D单孔胸腔镜在非小细胞肺癌(NSCLC)手术中的应用效果及对患者术后恢复的影响。方法:选取2022年8月—2024年8月南通市肿瘤医院行NSCLC手术的150例患者,依据手术方式分为研究组(n=78)和对照组(n=72)。对照组采用2D单孔胸腔镜手术治疗,研究组采用3D单孔胸腔镜手术治疗,比较两组患者手术相关指标、血清指标、免疫指标、术后并发症发生情况。结果:两组在术中出血量、淋巴结清扫数目、术后留管时间、术后72 h VAS评分方面的差异无统计学意义(P>0.05),但研究组手术时间长于对照组,住院时间、术后引流量、术后24 h VAS评分均低于对照组(P<0.05)。相较于术前,两组术后1 d Cor、去甲肾上腺素(NE)、丙二醛(MDA)水平均升高,超氧化物歧化酶(SOD)水平均降低(P<0.05),且研究组术后1 d Cor、NE、MDA、SOD水平均优于对照组(P<0.05)。研究组术后7 d IgA、IgM、IgG均高于对照组(P<0.05),且并发症总发生率较低(P<0.05)。结论:3D单孔胸腔镜在NSCLC手术中的应用效果良好,可有效缓解患者术后疼痛,改善免疫功能,减少应激反应和术后并发症发生率,促进术后恢复。展开更多
We present a numerical formulation for resin flow based on the concept of quasi-steady state situation at the flow front. To be fit for complicated product shapes,we use the four-node unstructured tetrahedron mesh bas...We present a numerical formulation for resin flow based on the concept of quasi-steady state situation at the flow front. To be fit for complicated product shapes,we use the four-node unstructured tetrahedron mesh based on which the numerical formulation of temperature and degree of cure is developed. The validity of our method is established in the case where ffexible meshes are used. The results show that the numerical procedure,tested on known data,provides numerically valid and reasonably accurate predictions.展开更多
无人机辅助通信系统是未来无线通信系统的重要组成部分。为进一步提高无人机辅助通信系统中时频资源的利用率,本文研究了一种基于非正交多址技术的无人机辅助通信架构,并提出了一种基于双延迟深度确定性策略梯度的TD3-TOPATM(twin delay...无人机辅助通信系统是未来无线通信系统的重要组成部分。为进一步提高无人机辅助通信系统中时频资源的利用率,本文研究了一种基于非正交多址技术的无人机辅助通信架构,并提出了一种基于双延迟深度确定性策略梯度的TD3-TOPATM(twin delayedtrajectory optimization and power allocation for total throughput maximization)算法,以最大化总吞吐量为目标,在满足最大功率约束、空间约束、最大飞行速度和服务质量(quality of service,QoS)约束的情况下,联合优化无人机的功率分配策略和3D轨迹。仿真实验分析结果表明,与随机算法相比,TD3-TOPATM算法能够实现98%的性能增益;与基于DQN(deep Q-network)的轨迹优化与资源分配算法相比,TD3-TOPATM算法获得的性能增益为19.4%;与基于深度确定性策略梯度的轨迹优化与资源分配算法相比,TD3-TOPATM算法得到的总吞吐量增加了9.7%;与基于正交多址技术的无人机辅助通信方案相比,基于非正交多址技术的无人机辅助通信方案实现了55%的性能增益。展开更多
In 3D models retrieval, feature description and retrieval of non-rigid model face more complex problems due to the isometry transformation of itself. We introduce the hierarchical combination matching into the feature...In 3D models retrieval, feature description and retrieval of non-rigid model face more complex problems due to the isometry transformation of itself. We introduce the hierarchical combination matching into the feature comparison, and build a map between the divided regions of two models, and then achieve accurate feature matching based on patch-by-patch, which successfully introduces the spatial information into feature matching. Verified by experiment, the 3D model retrieval method proposed in this paper based on hierarchical combination matching can make sure more accurate feature matching, so as to enhance the precision of retrieval.展开更多
基金supported through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(2022M3H4A1A04096478)the support from the Supercomputing Center of Wuhan University。
文摘Electrocatalyst designs based on oxophilic foreign atoms are considered a promising approach for developing efficient pH-universal hydrogen evolution reaction(HER)electrocatalysts by overcoming the sluggish alkaline HER kinetics.Here,we design ternary transition metals-based nickel telluride(Mo WNi Te)catalysts consisting of high valence non-3d Mo and W metals and oxophilic Te as a first demonstration of non-precious heterogeneous electrocatalysts following the bifunctional mechanism.The Mo WNi Te showed excellent HER catalytic performance with overpotentials of 72,125,and 182 mV to reach the current densities of 10,100,and 1000 mA cm^(-2),respectively,and the corresponding Tafel slope of 47,52,and 58 mV dec-1in alkaline media,which is much superior to commercial Pt/C.Additionally,the HER performance of Mo WNi Te is well maintained up to 3000 h at the current density of 100 mA cm^(-2).It is further demonstrated that the Mo WNi Te exhibits remarkable HER activities with an overpotential of 45 mV(31 mV)and Tafel slope of 60 mV dec-1(34 mV dec-1)at 10 mA cm^(-2)in neutral(acid)media.The superior HER performance of Mo WNi Te is attributed to the electronic structure modulation,inducing highly active low valence states by the incorporation of high valence non-3d transition metals.It is also attributed to the oxophilic effect of Te,accelerating water dissociation kinetics through a bifunctional catalytic mechanism in alkaline media.Density functional theory calculations further reveal that such synergistic effects lead to reduced free energy for an efficient water dissociation process,resulting in remarkable HER catalytic performances within universal pH environments.
基金supported by the National Natural Science Foundation of China (Nos. 22090061, 21731007, 21890380 and 22161021)the Guangdong Pearl River Talents Program (No. 2017BT01C161)the support of Jiangxi Province (No. jxsq2018106041)。
文摘Cycloaddition of CO_(2) and epoxide into cyclic carbonate is one of the most efficient ways for CO_(2) conversion with 100% atom-utilization. Metal–organic frameworks are a kind of potential heterogeneous catalysts, however, high temperature, high pressure, and high-purity CO_(2) are still required for the reaction.Here, we report two new Zn(Ⅱ) imidazolate frameworks incoporating MoO_(4)^(2–)or WO_(4)^(2–)units, which can catalyse cycloaddition of CO_(2) and epichlorohydrin at room temperature and atomospheric pressure, giving 95% yield after 24 h in pure CO_(2) and 98% yield after 48 h in simulated flue gas(15% CO_(2)+ 85% N_(2)),respectively. For comparison, the analogic Zn(Ⅱ) imidazolate framework MAF-6 without non-3d metal oxide units showed 71% and 33% yields under the same conditions, respectively. The insightful modulation mechanisms of the MoO_(4)^(2–)unit in optimizing the electronic structure of Zn(Ⅱ) centre, facilitating the rate-determined ring opening process, and minimizing the reaction activation energy, were revealed by X-ray photoelectron spectroscopy, temperature programmed desorption and computational calculations.
文摘目的:探究3D单孔胸腔镜在非小细胞肺癌(NSCLC)手术中的应用效果及对患者术后恢复的影响。方法:选取2022年8月—2024年8月南通市肿瘤医院行NSCLC手术的150例患者,依据手术方式分为研究组(n=78)和对照组(n=72)。对照组采用2D单孔胸腔镜手术治疗,研究组采用3D单孔胸腔镜手术治疗,比较两组患者手术相关指标、血清指标、免疫指标、术后并发症发生情况。结果:两组在术中出血量、淋巴结清扫数目、术后留管时间、术后72 h VAS评分方面的差异无统计学意义(P>0.05),但研究组手术时间长于对照组,住院时间、术后引流量、术后24 h VAS评分均低于对照组(P<0.05)。相较于术前,两组术后1 d Cor、去甲肾上腺素(NE)、丙二醛(MDA)水平均升高,超氧化物歧化酶(SOD)水平均降低(P<0.05),且研究组术后1 d Cor、NE、MDA、SOD水平均优于对照组(P<0.05)。研究组术后7 d IgA、IgM、IgG均高于对照组(P<0.05),且并发症总发生率较低(P<0.05)。结论:3D单孔胸腔镜在NSCLC手术中的应用效果良好,可有效缓解患者术后疼痛,改善免疫功能,减少应激反应和术后并发症发生率,促进术后恢复。
文摘We present a numerical formulation for resin flow based on the concept of quasi-steady state situation at the flow front. To be fit for complicated product shapes,we use the four-node unstructured tetrahedron mesh based on which the numerical formulation of temperature and degree of cure is developed. The validity of our method is established in the case where ffexible meshes are used. The results show that the numerical procedure,tested on known data,provides numerically valid and reasonably accurate predictions.
文摘无人机辅助通信系统是未来无线通信系统的重要组成部分。为进一步提高无人机辅助通信系统中时频资源的利用率,本文研究了一种基于非正交多址技术的无人机辅助通信架构,并提出了一种基于双延迟深度确定性策略梯度的TD3-TOPATM(twin delayedtrajectory optimization and power allocation for total throughput maximization)算法,以最大化总吞吐量为目标,在满足最大功率约束、空间约束、最大飞行速度和服务质量(quality of service,QoS)约束的情况下,联合优化无人机的功率分配策略和3D轨迹。仿真实验分析结果表明,与随机算法相比,TD3-TOPATM算法能够实现98%的性能增益;与基于DQN(deep Q-network)的轨迹优化与资源分配算法相比,TD3-TOPATM算法获得的性能增益为19.4%;与基于深度确定性策略梯度的轨迹优化与资源分配算法相比,TD3-TOPATM算法得到的总吞吐量增加了9.7%;与基于正交多址技术的无人机辅助通信方案相比,基于非正交多址技术的无人机辅助通信方案实现了55%的性能增益。
基金Supported by National Nature Science Foundation of China(61379106,61379082,61227802)Shandong Provincial Natural Science Foundation(ZR2013FM036,ZR2015FM011,ZR2015FM022)
文摘In 3D models retrieval, feature description and retrieval of non-rigid model face more complex problems due to the isometry transformation of itself. We introduce the hierarchical combination matching into the feature comparison, and build a map between the divided regions of two models, and then achieve accurate feature matching based on patch-by-patch, which successfully introduces the spatial information into feature matching. Verified by experiment, the 3D model retrieval method proposed in this paper based on hierarchical combination matching can make sure more accurate feature matching, so as to enhance the precision of retrieval.
