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盖挖法和盖挖法施工

市政技术 2004年第6期22卷 359-370页

作者：萧岩汪波王光明北京市市政工程研究院北京100037 北京市政集团四处北京100055

以国内盖挖法工程实例,对盖挖顺筑、盖挖逆筑、盖挖半逆筑的工艺特点进行详细分析。同时总结归纳了北京地区盖挖法施工应注意的技术问题。

关键词：盖挖法施工工程实例工艺特点技术问题国内

气体雾化AB_5型贮氢合金微观结构特征及电化学性能

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沈阳工业大学学报 2004年第4期26卷 396-398页

作者：佟敏袁晓光沈阳工业大学材料科学与工程学院

用气体雾化方法可以制备具有CaCu5型六方晶体结构MmNi5-x(CoMnAl)x的球形贮氢合金粉.其贮氢合金表面存在氧化层.气体雾化合金需要较长周期才能充分活化,然而气体雾化合金的循环寿命明显优于机械球磨合金.

关键词：气体雾化贮氢合金显微特征电化学性能

Confined cobalt single-atom catalysts with strong electronic metal-support interactions based on a biomimetic self-assembly strategy

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Carbon Energy 2024年第9期6卷 156-171页

作者： Bowen Guo Zekun Wang Lei Zheng guang Mo Hongjun Zhou Dan Luo State Key Laboratory of Heavy Oil Processing Beijing Key Laboratory of Biogas Upgrading UtilizationCollege of New Energy and MaterialsChina University of Petroleum(Beijing)BeijingChina Beijing Key Laboratory of Micro-Nano Energy and Sensor CAS Center for Excellence in NanoscienceBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingChina School of Chemical Engineering Shandong Institute of Petroleum and Chemical TechnologyDongyingShandongChina School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijingChina Institute of High Energy Physics Chinese Academy of SciencesBeijingChina

Designing high-performance and low-cost electrocatalysts for oxygen evolu-tion reaction(OER)is critical for the conversion and storage of sustainable energy *** by the biomineralization process,we utilized the phosphorylation sites of collagen molecules to combine with cobalt-based mononuclear precursors at the molecular level and built a three-dimensional(3D)porous hierarchical material through a bottom-up biomimetic self-assembly strategy to obtain single-atom catalysts confined on carbonized biomimetic self-assembled carriers(Co SACs/cBSC)after subsequent high-temperature *** this strategy,the biomolecule improved the anchoring efficiency of the metal precursor through precise functional groups;meanwhile,the binding-then-assembling strategy also effectively suppressed the nonspecific adsorption of metal ions,ultimately preventing atomic agglomeration and achieving strong electronic metal-support interactions(EMSIs).Experimental characterizations confirm that binding forms between cobalt metal and carbonized self-assembled substrate(Co–O_(4)–P).Theoretical calculations disclose that the local environment changes significantly tailored the Co d-band center,and optimized the binding energy of oxygenated intermediates and the energy barrier of oxygen *** a result,the obtained Co SACs/cBSC catalyst can achieve remarkable OER activity and 24 h durability in 1.M KOH(η1. at 288 mV;Tafel slope of 44 mV dec-1.,better than other transition metal-based catalysts and commercial IrO_(2).Overall,we presented a self-assembly strategy to prepare transition metal SACs with strong EMSIs,providing a new avenue for the preparation of efficient catalysts with fine atomic structures.

关键词： biomimetic self-assembly support electronic metal-support interactions oxygen evolution reaction single atoms catalysts

Melting geodynamics reveals a subduction origin for the Purang ophiolite,Tibet,China

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Acta Geochimica 2024年第4期43卷 754-773页

作者： Tao Ruan Zhong-Jie Bai Wei-guang Zhu Shi-Ji Zheng State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China

The debate regarding whether the Yarlung-Zangbo ophiolite(YZO)on the south of the Qinghai-Tibet Plateau,formed in a mid-ocean ridge(MOR)or a supra-subduction zone(SSZ)setting has remained *** we present petrological,mineralogical,and geochemical data associated with modeling melting geodynamics of the mantle peridotites from the Purang ophiolite in the western segment of the Yarlung-Zangbo Suture Zone(YZSZ)to explore its tectonic *** Purang lherzolites are characterized by the protogranular texture and have abyssal-peridotite-like mineral compositions,including low Cr^(#)(20-30)and TiO_(2) contents(1.t%)in spinel,high Al_(2)O_(3)(2.9wt%-4.4wt%)and CaO(1.9wt%-3.7wt%)contents in orthopyroxene and LREE-depletion in *** of these lherzolites can be modeled by~1.%dynamic melting of the DMM source with a small fraction of melt(~0.5%)entrapped within the source,a similar melting process to typical abyssal *** Purang harzburgites are characterized by the porphyroclastic texture and exhibit highly refractory mineral compositions such as high spinel Cr^(#)(40-68),low orthopyroxene Al_(2)O_(3)(1.1.t%)*** in these harzburgites are enriched in Sr(up to 6.0 ppm)and LREE[(Ce)N=0.02-0.4],but depleted in Ti(200 ppm,on average)and HREE[(Yb)N1.%-23%hydrous melting with the supply rate of slab fluid at 0.1.-1..The lower clinopyroxene V/Sc ratios in harzburgites than those in lherzolites suggest a high oxidation stage of the melting system of harzburgites,which is consistent with a hydrous melting environment for these *** is therefore concluded that the Purang ophiolite has experienced a transformat

关键词： Melting geodynamics SSZ peridotites MOR peridotites Clinopyroxene Purang ophiolite

Enhancing reversible hydrogen storage performance of 2LiBH_(4)–MgH_(2)via in-situ building heterogeneous nucleation sites

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Rare Metals 2024年第9期43卷 4367-4376页

作者： Wei Chen Ya-Hui Sun Tian Xu Xue-Bin Yu guang-Lin Xia Department of Materials Science Fudan UniversityShanghai 200433China

2LiBH_(4)-MgH_(2)composite is one of the most attractive reactive hydride composites with a theoretic hydrogen capacity of 1..8 wt%.However,the large nucleation restriction of MgB_(2)during the second step of dehydrogenation results in sluggish hydrogen storage kinetics and high operating temperature,which hinders its practical application as on-board hydrogen storage ***,Al3Ti doped Al nanoparticles(AT NPs)are prepared by a facile chemical reduction reaction to improve the hydrogen storage performance of 2LiBH_(4)-MgH_(2)*** the initial H_(2)desorption process,MgAlB_(4)and TiB_(2)that have identical crystal structure and low d-value mismatch with MgB_(2)resulting from the reaction between AT NPs and 2LiBH_(4)-MgH_(2)composite serve as effective nucleation sites for the formation of MgB_(2).As a result,the apparent activation energy of the two-step H_(2)desorption of AT NPs doped 2LiBH_(4)-MgH_(2)composite are notably decreased to(1.0.0±5.9)and(1.9.6±1.4)kJ·mol^(-1.,which is 55.5 and 33.5 kJ·mol^(-1.lower than that of the undoped *** importantly,a reversible hydrogen storage capacity of 9.2 wt%after 1.cycles of H_(2)desorption and adsorption could be achieved,corresponding to a capacity retention rate of 99%.The building of reactive bimetallic catalyst towards in situ formation of heterogeneous nucleation sites provides a new strategy for improving the hydrogen storage performance of reactive hydride composites.

关键词： Reversible hydrogen storage Reactive hydride composites Catalytic effects Heterogeneous nucleation

Pure quantum gradient descent algorithm and full quantum variational eigensolver

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Frontiers of physics 2024年第2期19卷 221-234页

作者： Ronghang Chen Zhou guang Cong Guo Guanru Feng Shi-Yao Hou College of Physics and Electronic Engineering Center for Computational SciencesSichuan Normal UniversityChengdu 610068China Shenzhen SpinQ Technology Co. Ltd.Shenzhen 518045China DEEPROUTE.AI

Optimization problems are prevalent in various fields,and the gradient-based gradient descent algorithm is a widely adopted optimization ***,in classical computing,computing the numerical gradient for a function with variables necessitates at least d+1.function evaluations,resulting in a computational complexity of O(d).As the number of variables increases,the classical gradient estimation methods require substantial resources,ultimately surpassing the capabilities of classical ***,leveraging the principles of superposition and entanglement in quantum mechanics,quantum computers can achieve genuine parallel computing,leading to exponential acceleration over classical algorithms in some *** this paper,we propose a novel quantum-based gradient calculation method that requires only a single oracle calculation to obtain the numerical gradient result for a multivariate *** complexity of this algorithm is just O(1..Building upon this approach,we successfully implemented the quantum gradient descent algorithm and applied it to the variational quantum eigensolver(VQE),creating a pure quantum variational optimization *** with classical gradient-based optimization algorithm,this quantum optimization algorithm has remarkable complexity advantages,providing an efficient solution to optimization *** proposed quantum-based method shows promise in enhancing the performance of optimization algorithms,highlighting the potential of quantum computing in this field.

关键词： quantum algorithm gradient descent variational quantum algorithm

Transcription factor Foxp1.is essential for the induction of choroidal neovascularization

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Eye and Vision 2024年第3期10卷 1-12页

作者： Meifang Yan Junjian Li Li Yan Xue Li Jie-guang Chen School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical UniversityState Key Laboratory of OptometryOphthalmology and Vision Scienceand Zhejiang Provincial Key Laboratory of Optometry and Ophthalmology270 Xueyuan RoadWenzhouZhejiang325027People’s Republic of China Joint Shantou International Eye Center(JSIEC)of Shantou University and the Chinese University of Hong Kong ShantouGuangdong515000People’s Republic of China

Background The exudative form of age-related macular degeneration(AMD)is characterized by abnormal blood vessel growth,which is stimulated by vascular endothelial growth factor(VEGF)released from retinal pigment epithelium(RPE).The angiogenic behaviors of vascular endothelial cells in vitro depend on forkhead box protein P1.Foxp1.,a transcription repressor widely expressed in human and murine tissues during *** this study,we aimed to determine whether loss of Foxp1.affects laser-induced choroidal neovascularization(CNV)in *** Eye-selective deletion of Foxp1.was obtained by crossing Foxp1.lox/flox with Six3-Cre *** photocoagulation was delivered to six-to eight-week-old mice to induce *** expression of Foxp1.and Cre was determined by immunofluorescence in cryostat sections of the *** fluorescein angiography(FFA),optical coherence tomography(OCT),and B4 isolectin staining were applied to analyze the leakage,bulge height,and area of CNV lesions,***-choroid tissues were isolated for the determination of VEGF and pigment epithelium derived factor(PEDF)by Western *** Foxp1.was expressed in retinal ganglion cells,RPE,and the choroidal endothelial *** photocoagulation increased the number of Foxp1.-endothelial cells and induced ***3-Cre reduced Foxp1.expression in RPE but not the endothelium,leading to a lower level of VEGF in the ***1.knockout inhibited pathological angiogenesis and vascular leakage of the laser-induced CNV *** Foxp1.regulates the expression of VEGF in the RPE,and inhibition of Foxp1.could potentially be a novel strategy for the prevention and therapy of neovascularization related to AMD.

关键词： Foxp1 Choroidal neovascularization Angiogenesis Laser photocoagulation Age-related macular degeneration

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利巴韦林注射液致精神障碍2例

中国新药与临床杂志 2003年第9期22卷 574-575页

作者：陈琦胡爱学刘光斌酒钢医院呼吸科甘肃嘉峪关735100 酒钢医院药剂科甘肃嘉峪关735100

利巴韦林(ribavirin)是人工合成的广谱抗病毒药，为单磷酸次黄嘌呤核苷（IMP）脱氢酶抑制剂，抑制细胞鸟苷单磷酸的合成，从而抑制病毒蛋白的转录，阻止病毒核酸合成，其抗病毒谱较广，对多种病毒有抑制作用。临床用于上呼吸道感染取得... 详细信息

利巴韦林(ribavirin)是人工合成的广谱抗病毒药，为单磷酸次黄嘌呤核苷（IMP）脱氢酶抑制剂，抑制细胞鸟苷单磷酸的合成，从而抑制病毒蛋白的转录，阻止病毒核酸合成，其抗病毒谱较广，对多种病毒有抑制作用。临床用于上呼吸道感染取得较好疗效，其剂型有注射液、口服液、滴鼻液，其不良反应是长期大量应用可引起血管外溶血、骨髓抑制，为可逆性。此外有胃肠道出血、血清胆红素增加、血清铁和尿酸增高、血清转氨酶升高的报道。该药引起精神障碍的不良反应，作者未见国内文献报道。作者在2001.和2002年分别遇到了利巴韦林注射液致精神障碍各1.，现报道如下。

关键词：利巴韦林注射液药物不良反应精神障碍病例报告

A machine learning model for colorectal liver metastasis post-hepatectomy prognostications: several strategies for the model evaluation

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Hepatobiliary Surgery and Nutrition 2024年第4期13卷 752-754页

作者： guang-Yao Li Lu-Lu Zhai Department of General Surgery The Second People’s Hospital of WuhuWuhuChina Department of General Surgery The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiChina

With great interest,we read the article by Lam et al.(1.entitled“A machine learning model for colorectal liver metastasis post-hepatectomy prognostications”.In this study,the authors included colorectal liver metastasis(CRLM)patients from four hospitals in Hong Kong who underwent hepatic resection,and developed a survival prediction model based on the patients’demographic,oncologic,clinicopathologic,and therapeutic characteristics using machine *** Cox proportional hazards and least absolute shrinkage and selection operator(LASSO)regression analyses,the authors successfully developed a predictive model consisting of eight predictors that could accurately predict overall survival(OS)and recurrence-free survival(RFS)after hepatectomy in patients with *** is an intriguing study with significant clinical value,and the authors deserve to be commended for their ***,there are still several issues that need to be addressed in this study.

关键词： Colorectal liver metastasis(CRLM) hepatectomy survival prediction model