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计算机软件开发中数据库安全设计的应用研究

科学与信息化 2024年第9期 34-36页

作者：文见明安杰邱菊华北计算技术研究所北京 100083

面对我国经济发展步伐的不断加快,各个行业都迎来了更多机遇,在这样的形势下,计算机发挥了重要作用,同时人们也对其安全性提出了更加严格的要求.技术人员十分关注计算机软件的设计,只有逐步强化软件的性能,才能满足当今社会对互联网环... 详细信息

面对我国经济发展步伐的不断加快,各个行业都迎来了更多机遇,在这样的形势下,计算机发挥了重要作用,同时人们也对其安全性提出了更加严格的要求.技术人员十分关注计算机软件的设计,只有逐步强化软件的性能,才能满足当今社会对互联网环境的诸多要求.因此,本文围绕计算机软件开发中数据库安全设计的应用展开讨论,分析当前数据库开发的注意事项及测试问题,并结合一些数据,深入研究计算机软件开发中数据库安全设计的应用,可为相关人员提供一些借鉴.

关键词：计算机软件数据库开发应用价值安全设计

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嗜酸性粒細胞在結直腸息肉腫瘤組織中的意義

镜湖医学 2024年第1期24卷 37-38,F0003页

作者：葉玉清肖剛文劍明澳門鏡湖醫院病理科中国

目的探討嗜酸性粒細胞在結直腸息肉和腫瘤組織中的分佈及意義。方法選擇2022年6月~2023年6月鏡湖醫院腸鏡檢查並行結直腸息肉摘除的患者採用光學顯微鏡觀察結直腸息肉組織中嗜酸性粒細胞的分佈和數量。結果共860例,包括結直腸腺癌52例,... 详细信息

目的探討嗜酸性粒細胞在結直腸息肉和腫瘤組織中的分佈及意義。方法選擇2022年6月~2023年6月鏡湖醫院腸鏡檢查並行結直腸息肉摘除的患者採用光學顯微鏡觀察結直腸息肉組織中嗜酸性粒細胞的分佈和數量。結果共860例,包括結直腸腺癌52例,高級别異型增生腺瘤78例,低級别異型增生腺瘤481例,增生性息肉249例。嗜酸性粒細胞彌漫分佈於息肉的間質組織。在249例非腫瘤組(增生性息肉)中,>20/HPF嗜酸性粒細胞的病例為81例(32.5%);在611例腫瘤組(包括腺癌,高級别和低級别異型增生腺瘤)中,>20/HPF嗜酸性粒細胞的病例為600例(98.2%)。非腫瘤組與腫瘤組嗜酸性粒細胞的分佈和數量差異在統計學上有顯著性意義(P20/HPF嗜酸性粒細胞的病例分别佔96.2%(50/52),98.7%(77/78),98.3%(473/481)。各級别腫瘤組之間嗜酸性粒細胞數量的差異,在統計學上無顯著性意義(P>0.05)。結論嗜酸性粒細胞的分佈和數量與結直腸腫瘤形成有明顯的相關性。

关键词：嗜酸性粒細胞增生性息肉腺瘤腺癌

Oscillation properties of eigenfunctions for Sturm-Liouville problems with interface conditions via Prufer transformation

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Applied Mathematics(A Journal of Chinese Universities) 2024年第2期39卷 191-200页

作者： LI Zhi-yu LI Kun CAI Jin-ming QIN jian-fang ZHENG Zhao-wen School of Mathematical Sciences Qufu Normal UniversityQufu 273165China College of Mathematics and Systems Science Guangdong Polytechnic Normal UniversityGuangzhou 510665China

A class of Sturm-Liouville problems with discontinuity is studied in this *** oscillation properties of eigenfunctions for Sturm-Liouville problems with interface conditions are *** main method used in this paper is based on Prufer transformation,which is different from the classical ***,we give two examples to verify our main results.

关键词： Sturm-Liouville problem interface condition oscillatory solution

A Facile Stereospecific Synthesis of 1, 3-Enynylsulfides via Sonogashira Coupling of （E）-a-Iodovinyl Sulfides with 1-Alkynes

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Chinese Chemical Letters 2006年第6期17卷 757-760页

作者： jian wen jianG ming Zhong CAI Department of Chemistry Jiangxi Normal University Nanchang 330027

（E）-α-Iodovinyl sulfides 1 underwent the Sonogashira coupling reactions with terminal alkynes 2 in piperidine at room temperature in the presence of 5 mol % of Pd（PPh3）4 and 10 mol % of CuI to afford the correspo... 详细信息

关键词： (E)-α-Iodovinyl sulfide 1 3-enynylsulfide Sonogashira coupling terminal alkyne.

Adhesion strength of tetrahydrofuran hydrates is dictated by substrate stiffness

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Petroleum Science 2024年第1期21卷 667-673页

作者： Yan-wen Lin Tong Li Yi Zhang Wei-Wei Yan Xiao-ming Chen Zhi-Sen Zhang jian-Yang Wu Department of Physics Research Institute for Biomimetics and Soft MatterJiujiang Research Institute and Fujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen361005FujianChina Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201ZhejiangChina Key Laboratory of Icing and Anti/De-icing China Aerodynamics Research and Development CenterMianyang621000SichuanChina Micro-and Nano-technology Research Center State Key Laboratory for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an710049ShaanxiChina Electronic Materials Research Lab Key Laboratory of the Ministry of EducationXi’an Jiaotong UniversityXi’an710049ShaanxiChina NTNU Nanomechanical Lab Norwegian University of Science and Technology(NTNU)Trondheim7491Norway

Understanding the hydrate adhesion is important to tackling hydrate accretion in ***,the relationship between the Tetrahydrofuran(THF)hydrate adhesion strength(AS)and surface stiffness on elastic coatings is systemically examined by experimental shear force measurements and theoretical *** mechanical factor-elastic modulus of the coatings greatly dictates the hydrate AS,which is explained by the adhesion mechanics theory,beyond the usual factors such as wettability and structural ***,the hydrate AS increases with reducing the thickness of the elastic coatings,resulted from the decrease of the apparent surface elastic *** effect of critical thickness for the elastic materials with variable elastic modulus on the hydrate AS is also *** study provides deep perspectives on the regulation of the hydrate AS by the elastic modulus of elastic materials,which is of significance to design anti-hydrate surfaces for mitigation of hydrate accretion in petro-pipelines.

关键词： Hydrate Adhesion strength Elastic modulus Coatings

A facile stereospecific synthesis of (Z)-2-sulfonyl-substituted 1,3-enynes via Sonogashira coupling of (E)-α-iodovinyl sulfones with 1-alkynes

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Chinese Chemical Letters 2007年第7期18卷 773-776页

作者： wen Yan Hao jian wen jiang ming Zhong Cai Department of Chemistry Jiangxi Normal University Nanchang 330022 China

（E）-α-Iodovinyl sulfones 1 underwent the Sonogashira coupling reactions with terminal alkynes 2 in piperidine at room temperature in the presence of 5 mol% of Pd（PPh3）4 and 10 mol% of CuI to stereospecifically af... 详细信息

关键词： (E)-α-Iodovinyl sulfone 1,3-Enynylsulfone Sonogashira coupling Terminal alkyne

Effect of cooling method on TiN precipitation behavior of high-titanium high-strength steel during solidification

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Journal of Iron and Steel Research(International) 2024年第7期31卷 1692-1703页

作者： Xue-jian Zhang Guang-wei Yang Yong Wan Yong-hong wen Chuan-sheng Tang ming-qi Liu Li-je Tian Key Laboratory of Metallurgical Emission Reduction and Resources Recycling Anhui University of TechnologyMa'anshan 243002AnhuiChina School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Baosteel Central Research Institute Baoshan Iron and Steel Co.Ltd.Shanghai 201999China

Metallographic microscopy,scanning electron microscopy and TiN growth thermodynamic and kinetic equations were used to investigate the morphology,quantity,and size of TiN in the center of high-titanium high-strength steels under different solidification cooling *** results showed that TiN in the center of the experimental steels mainly existed in three forms:single,composite(Al2O3-TiN),and multi-particle *** began precipitating at around 1497℃(solidification fraction of 0.74).From the end of melting to solidification for 180 s,the cooling rates in the center of the experimental steels for furnace cooling,air cooling,refractory mold cooling,and cast iron mold cooling tended to stabilize at 0.17,0.93,1.65,and 2.15℃/s,*** size of TiN in the center of the experimental steel cooled using furnace cooling was mainly concentrated in the 5-15 pm *** contrast,the size of TiN in the center of the experimental steels cooled using air cooling,refractory mold cooling,and cast iron mold cooling were mainly concentrated in the 1-5 pm *** addition,their density of TiN in the center of the experimental steels is signif-icantly higher than that of the furnace-cooled experimental *** and kinetic precipitation models of TiN established predicted the growth size of TiN in a high-titanium high-strength steel when the solidification cooling rates are not below 0.93℃/s.

关键词： High-titanium steel Cooling method TiN Thermodynamics Kinetics

In situ embedded bismuth nanoparticles among highly porous carbon fibers for efficient carbon dioxide reduction

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Rare Metals 2024年第9期43卷 4312-4320页

作者： Wei-jian Guo Ao Zhou wen-wen Cai Jin-Tao Zhang Key Laboratory for Colloid and Interface Chemistry (Ministry of Education) School of Chemistry and Chemical EngineeringShandong University

Electrocatalysis provides an optimal approach for the conversion of carbon dioxide(CO2) into high-value chemicals, thereby presenting a promising avenue toward achieve carbon neutrality. However, addressing the selectivity and stability challenges of metal catalysts in electrolytic reduction remains a daunting task. In this study, the electrospinning method is employed to fabricate porous carbon nanofibers loaded with bismuth nanoparticles with the help of in situ pyrolysis. The porous carbon nanofibers as conductive support would facilitate the dispersion of bismuth active sites while inhibiting their aggregation and promoting the mass transfer, thus enhancing their electrocatalytic activity and stability. Additionally, nitrogen doping induces electron delocalization in bismuth atoms through metal-support interactions, thus enabling efficient adsorption of intermediates for improving selectivity based on the theoretical calculation. Consequently, Bi@PCNF-500 exhibits the exceptional selectivity and stability across a wide range of potential windows. Notably, its faradaic efficiency(FE) of formate reaches 92.7% in H-cell and94.9% in flow cell, respectively, with good electrocatalytic stability. The in situ characterization and theoretical calculations elucidate the plausible reaction mechanism to obtain basic rules for designing efficient electrocatalyst.

关键词： Carbon dioxide reduction Electron delocalization N-doping Porous carbon nanofiber

Observation of gapless corner modes of photonic crystal slabs in synthetic translation dimensions

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Photonics Research 2024年第3期12卷 444-455页

作者： wen-JIN ZHANG HAO-CHANG MO wen-JIE CHEN XIAO-DONG CHEN jian-wen DONG School of Physics&State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China

Second-order topological photonic crystals support localized corner modes that deviate from the conventional bulk-edge ***,the frequency shift of corner modes spanning the photonic band gap has not been experimentally ***,we observe the gapless corner modes of photonic crystal slabs within a parameter space by considering translation as an additional synthetic *** corner modes,protected by topological pumping in synthetic translation dimensions,are found to exist independently of the specific corner *** gapless corner modes are experimentally imaged via the near-field scanning measurement and validated numerically by full-wave *** propose a topological rainbow with gradient translation,demonstrating the ability to extract and separate specific frequency components of light into different spatial *** work contributes to the advancement of topological photonics and provides valuable insights into the exploration of gapless corner modes in synthetic dimensions.

关键词： translation dimensions corner