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Adequate alignment and interaction for cross-modal retrieval

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Virtual Reality & Intelligent Hardware 2023年第6期5卷 509-522页

作者： mingkang WANG min meng Jigang LIU Jigang WU School of Computer Science and Technology Guangdong University of TechnologyGuangzhou 510006China Ping An Life Insurance of China Shenzhen 518033China

Background Cross-modal retrieval has attracted widespread attention in many cross-media similarity search applications,particularly image-text retrieval in the fields of computer vision and natural language ***,visual and semantic embedding(VSE)learning has shown promising improvements in image text retrieval *** existing VSE models employ two unrelated encoders to extract features and then use complex methods to contextualize and aggregate these features into holistic *** recent advances,existing approaches still suffer from two limitations:(1)without considering intermediate interactions and adequate alignment between different modalities,these models cannot guarantee the discriminative ability of representations;and(2)existing feature aggregators are susceptible to certain noisy regions,which may lead to unreasonable pooling coefficients and affect the quality of the final aggregated *** To address these challenges,we propose a novel cross-modal retrieval model containing a well-designed alignment module and a novel multimodal fusion encoder that aims to learn the adequate alignment and interaction of aggregated features to effectively bridge the modality *** Experiments on the Microsoft COCO and Flickr30k datasets demonstrated the superiority of our model over state-of-the-art methods.

关键词： Cross-modal retrieval Visual semantic embedding Feature aggregation Transformer

Ablation of NTPDase2+ cells inhibits the formation of filiform papillae in tongue tip

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Animal Models and Experimental Medicine 2018年第2期1卷 143-151页

作者： Feng Li Bo-Wen Niu meng-min Zhu Department of Laboratory Animal Science Shanghai Public Health Clinical CenterFudan University

Background: Lingual epithelia in the tongue tip are among the most rapidly regenerating tissues, but the mechanism of cell genesis in this tissue is still unknown. Previous study has suggested the existence of multiple stem cell pools in lingual epithelia and papillae. Like K14+ and Sox2+ cells, NTPDase2+ cells have characteristics of stem ***: We employed a system using doxycycline to conditionally ablate NTPDase2+ cells in lingual epithelia and papillae by regulated expression of the diphtheria toxin A(DTA) gene. Transgenic lines, which expressed the rtTA gene in NTPDase2+ cells, were produced by pronuclear injection of zygotes from C57 BL/6 mice using the BAC clone RP23-47 P18. The NTPDase2-rtTA transgenic mice were crossed with the TetO-DTA transgenic animals. The double transgenic mice were treated with doxycycline. Doxycycline(Dox) was diluted in 5% sucrose in water to a final concentration of 0.3-0.5 mg/mL and supplied as drinking ***: After 15 days of Dox induction, the expression of NTPDase2, Sox2 and K14 was ablated from lingual epithelia. DTA expression in NTPDase2+cells did not inhibit the turnover of GNAT3+ or PLCb2+ cells in taste buds,nor the expression of S100 b beneath lingual epithelia and papillae. After35 days ablation of NTPDase2+ cells, the basic structure of lingual epithelia and papillae remained intact. However, the ratio of cell to total tissue area was decreased in lingual epithelia and circumvallate(CV) papillae. DTA expression also inhibited the regeneration of filiform papillae on the dorsal surface of the tongue ***: These studies provide important insights into the understanding of dynamic equilibrium among the multiple stem cell populations present in the lingual epithelia and papillae.

关键词： cell ablation lingual epithelia NTPDase2 papillae tissue regeneration

Corrosion behavior of low-carbon Cr micro-alloyed steel for grounding grids in simulated acidic soil

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Journal of Iron and Steel Research International 2018年第7期25卷 755-766页

作者： Jian Li Hang Su Feng Chai Dong-mei Xue Li Li Xiang-yang Li Hui-min meng Division of Engineering Steel Central Iron and Steel Research Institute Beijing 100081 China Enterprise Management Department China Iron and Steel Research Institute Group Beijing 100081 China Corrosion and Protection Center University of Science and Technology Beijing Beijing 100083 China

To improve the corrosion resistance of steels for grounding grids, a low-carbon Cr micro-alloyed steel was developed （C 1 steel）, and corrosion behavior of Q235 steel and newly developed C1 steel in simulated acidic soil was investigated. The corrosion rate was evaluated with the mass loss measurements, while the corrosion morphology of surface and cross section of rust layer was observed by scanning electron microscopy. The corrosion products were analyzed by energy- dispersive X-ray spectrometry, X-ray diffraction and X-ray photoelectron spectroscopy, and the polarization curve was measured using potentiodynamic polarization method. Results indicated that C 1 steel displayed good corrosion resistance in the simulated acidic soil, of which the corrosion rate was only 30% of that of Q235 steel after corrosion for 360 h. The analysis of rust layer showed that lower carbon content in steel could reduce the tendency of micro cell corrosion and appropriate amount of chromium could improve the corrosion potential of metal matrix. Moreover, the analysis of X-ray photoelectron spectroscopy revealed that the chromium enriched in inner rust layer of C1 steel existed mainly in the form of Fe2CrO4, which facilitated the formation of Cr-goethite and improved the protection of corrosion products.

关键词： Soil corrosion Grounding grid Low-carbon steel Cr micro-alloying Corrosion product - Cr-goethite

Effects of BN content on the mechanical properties of nanocrystalline 3Y-TZP/Al_(2)O_(3)/BN dental ceramics

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International Journal of minerals,Metallurgy and Materials 2021年第11期28卷 1854-1860页

作者： Lei Zhou Yan-fang Zhang Pan Yi Ying Wen Chao-fang Dong Li-min meng Se-fei Yang Medical School of Chinese PLA Beijing 100853China Department of Stomatology The First Medical CenterChinese PLA General HospitalBeijing 100853China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Journals Publishing Center University of Science and Technology BeijingBeijing 100083China Department of Medical Imaging Air Force Medical CenterPLABeijing 100142China

3Y-TZP/3wt%Al_(2)O_(3) powder was coated with varying amounts of BN using the urea and borate reaction sintering method,and then multiphase ceramics were prepared by hot pressing *** micro-topography and the compositional analysis of synthesized ceramics were conducted through scanning electron microscopy,transmission electron microscopy and X-ray diffraction.A mechanical tester was used to analyze the Vickers hardness,fracture toughness,and bending strength of the synthesized *** results showed that the ceramic with a BN content of 12wt%showed the best processability,but had diminished mechanical properties(such as fracture toughness and bending strength).The ceramic with a BN content of 9wt%showed better processability than those with 3wt%and 6wt%***,the fracture toughness was affected by the addition of 9wt%BN,making this ceramic only usable as a base material for a three-unit fixed *** contrast,the ceramics with a BN content of 3wt%or 6wt%fulfilled the criteria for use in multi-unit restoration,but their low processability made them unsuitable for milling after sintering.

关键词： multiphase ceramic boron nitride mechanical properties reaction sintering method

Effects of different frequencies of repetitive transcranial magnetic stimulation on the recovery of upper limb motor dysfunction in patients with subacute cerebral infarction

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Neural Regeneration Research 2016年第10期11卷 1584-1590页

作者： Jiang Li Xiang-min meng Ru-yi Li Ru Zhang Zheng Zhang Yi-feng Du Shandong Provincial Hospital of Shandong University Jinan Shandong Province China Affiliated Hospital of Qingdao University Qingdao Shandong Province China

Studies have confirmed that low-frequency repetitive transcranial magnetic stimulation can decrease the activity of cortical neurons, and high-frequency repetitive transcranial magnetic stimulation can increase the excitability of cortical neurons. However, there are few studies concerning the use of different frequencies of repetitive transcranial magnetic stimulation on the recovery of upper-limb motor function after cerebral infarction. We hypothesized that different frequencies of repetitive transcranial magnetic stimulation in patients with cerebral infarction would produce different effects on the recovery of upper-limb motor function. This study enrolled 127 patients with upper-limb dysfunction during the subacute phase of cerebral infarction. These patients were randomly assigned to three groups. The low-frequency group comprised 42 patients who were treated with 1 Hz repetitive transcranial magnetic stimulation on the contralateral hemisphere primary motor cortex （M1）. The high-frequency group comprised 43 patients who were treated with 10 Hz repetitive transcranial magnetic stimulation on ipsilateral M1. Finally, the sham group comprised 42 patients who were treated with 10 Hz of false stimulation on ipsilateral M1. A total of 135 seconds of stimulation was applied in the sham group and high-frequency group. At 2 weeks after treatment, cortical latency of motor-evoked potentials and central motor conduction time were significantly lower compared with before treatment. Moreover, motor function scores were significantly improved. The above indices for the low- and high-frequency groups were significantly different compared with the sham group. However, there was no significant difference between the low- and high-frequency groups. The results show that low- and high-frequency repetitive transcranial magnetic stimulation can similarly improve upper-limb motor function in patients with cerebral infarction.

关键词： nerve regeneration brain injury repetitive transcranial magnetic stimulation cerebral infarction low-frequency stimulation high-frequency stimulation upper-limb motor function cerebral cortex stroke rehabilitation motor-evoked potential central motor conductiontime primary motor cortex neuroplasticity neural reorganization neural regeneration

Cu,N codoped carbon nanosheets encapsulating ultrasmall Cu nanoparticles for enhancing selective 1,2-propanediol oxidation

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Journal of Energy Chemistry 2024年第4期91卷 27-35页

作者： Yonghai Feng min Yu minjia meng Lei Liu Dewei Rao Institute for Advanced Materials School of Materials Science and EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

In the selective oxidation of biomass-based 1,2-propanediol(PDO)with oxygen as the terminal oxidant,it is challenging to improve the lactic acid(LA)selectivity for nonnoble metal nanoparticles(NPs)due to their limited oxygen reduction rate and easy C-C *** the high economic feasibility of nonnoble metals,i.e.,Cu,in this work,copper and nitrogen codoped porous carbon nanosheets encapsulating ultrafine Cu nanoparticles(Cu@Cu-N-C)were developed to realize highly selective of PDO oxidation to *** carbon-encapsulated ultrasmall Cu^(0)NPs in Cu@Cu-N-C have high PDO dehydrogenation activity while N-coordinated Cu(Cu-N)sites are responsible for the high oxygen reduction ***,the performance of catalytic PDO conversion to LA is optimized by a proposed pathway of PDO→hydroxylacetone→lactaldehyde→***,the enhanced LA selectivity is 88.5%,and the PDO conversion is up to 75.1%in an O_(2)-pressurized reaction system(1.0 MPa O_(2)),superior to other Cu-based catalysts,while in a milder nonpressurized system(O_(2)flow rate of 100 mL min-1),a remarkable LA selectivity(94.2%)is obtained with 39.8%PDO conversion,2.2 times higher than that of supported Au nanoparticles(1%Au/C).Moreover,carbon encapsulation offers Cu@Cu-N-C with strong leaching resistance for better recycling.

关键词： Selective oxidation Copper and nitrogen doped carbon 1,2-Propanediol Ultrasmall Cu nanoparticles Lactic acid

Simulated Corrosion Test of Q235 Steel in Diatomite Soil

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Journal of Iron and Steel Research International 2015年第4期22卷 352-360页

作者： Jian LI Hang SU Feng CHAI Xiao-ping CHEN Xiang-yang LI Hui-min meng Division of Engineering Steel Central Iron and Steel Research Institute Corrosion and Protection Center University of Science and Technology Beijing

Through the study of the corrosion behavior of Q235 steel in actual Yingtan soil and two simulated acidic soils with different water contents, the calculation of corrosion mass losses, and the analysis of the corrosion mor- phologies and products by means of scanning electron microscope （SEM） and X-ray diffraction （XRD）, the results demonstrated that the diatomite soil could simulate the corrosion in actual soil veritably. In both actual soil and simu- lated soil with 16.4% water content, the corrosion rates of Q235 steel were approximately 0.1 mm/a, the corrosion morphologies were mainly extension and connection of corrosion spots on sample surface, and the corrosion products were composed of a-FeOOH, γ-FeOOH, Fe3 O4 and Fe2O3. When other media conditions remained unchanged, the corrosion area of Q235 steel was larger in simulated soil with 34.5 % water content, and the corrosion rate reached 0.48 mm/a after 360 h of corrosion, which was nearly 5 times as the value in actual soil. Compared with the corro- sion products in actual soil, the proportion of γ-FeOOH in simulated soil with 34.5 % water content was higher, and the wα-FeOOH/wγ-FeOOH ratio was 1. 4, which was only 1/3 of the value in actual soil.

关键词： soil corrosion simulated test diatomite corrosion behavior water content Q235 steel

对成年2型糖尿病患者基于移动APP+家属共管血糖的研究

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护理学报 2024年第9期31卷 60-65页

作者：叶香黎楷黄敏张倩李际敏刘荣珍孟敏朱少玉谢翠华南方医科大学南方医院内分泌代谢科广东广州510515 南方医科大学护理学院广东广州510515 佛山市南海区公共卫生医院内二科广东佛山528226

目的评价成年2型糖尿病患者应用移动APP+家属共管血糖改善自我管理行为和血糖控制的有效性及可持续性。方法选取2022年5月—2023年6月广州市某三级甲等医院的成年2型糖尿病患者作为研究对象,将患者随机分为对照组(n=69)和试验组(n=68)... 详细信息

目的评价成年2型糖尿病患者应用移动APP+家属共管血糖改善自我管理行为和血糖控制的有效性及可持续性。方法选取2022年5月—2023年6月广州市某三级甲等医院的成年2型糖尿病患者作为研究对象,将患者随机分为对照组(n=69)和试验组(n=68)。对照组采用移动APP血糖管理模式,试验组采用移动APP+家属共管血糖模式。观察并比较干预前、干预3个月末、干预6个月末2组空腹血糖、糖化血红蛋白、糖尿病自我管理行为量表、家庭成员行为量表、照顾者负担量表的变化和得分差异。由于这5个指标均不服从正态分布,所以在分析之前对其分别做基于秩次的逆正态变换(INT)。结果干预前2组的INT变换后空腹血糖、糖化血红蛋白、糖尿病自我管理行为量表、糖尿病患者家庭成员行为量表和照顾者负担量表得分差异均无统计学意义(P>0.05)。试验组3个月末和6个月末的INT变换后糖尿病自我管理行为量表得分、空腹血糖、糖化血红蛋白均优于对照组(P<0.05)。相较于干预前,试验组干预3个月末的INT变换后糖尿病自我管理行为量表得分升高;干预3个月末和6个月末的INT变换后空腹血糖、糖化血红蛋白、照顾者负担量表得分降低,INT变换后家庭成员行为量表得分升高。结论移动APP+家属共管血糖可以增加家庭支持水平,改善患者自我管理行为和血糖控制,且不增加家属照顾负担。研究者停止干预3个月后,患者仍然具有良好的血糖控制水平,可在2型糖尿病患者居家智能血糖管理中推广。

关键词： 2型糖尿病移动APP 家属血糖自我管理

Aerodynamic Performance of Three Flapping Wings with Unequal Spacing in Tandem Formation

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Journal of Bionic Engineering 2024年第4期21卷 1662-1676页

作者： min Chang Ziyi Xu Zengshuang Chen Li Li Xueguang meng Unmanned System Research Institute National Key Laboratory of Unmanned Aerial Vehicle TechnologyNorthwestern Polytechnical UniversityXi’an710072People’s Republic of China State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an710049People’s Republic of China Xi’an Aeronautics Computing Technique Research Institute Aviation Industry Corporation of ChinaXi’an710076People’s Republic of China

To better understand the aerodynamic reasons for highly organized movements of flying organisms,the three-flapping wing system in tandem formation was studied numerically in this *** from previous relevant studies on the multiple flapping wings that are equally spaced,this study emphasizes the impact of unequal spacing between individuals on the aerodynamics of each individual wing as well as the whole *** is found that swapping the distance between the first and second wing with the distance between the second wing and the rearmost wing does not affect the overall aerodynamic performance,but significantly changes the distribution of aerodynamic benefits across each *** the whole flapping cycle,three effects are at *** narrow channel effect and the downwash effect can promote and weaken the wing lift,respectively,while the wake capture effect can boost the *** also shows that these effects could be manipulated by changing the spacing between adjacent *** findings provide a novel way for flow control in tandem formation flight and are also inspiring for designing the formation flight of bionic aircraft.

关键词： Three flapping wings Unequal spacing Aerodynamic performance Tandem formation