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Theoretical analysis of long-lived radioactive waste in pressurized water reactor

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Nuclear Science and Techniques 2021年第7期32卷 55-71页

作者： Ze-Xin Fang Meng Yu ying-Ge Huang Jin-Bei Chen Jun su Long Zhu Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

Background The accelerator-driven subcritical transmutation system(ADS)is an advanced technology for the harmless disposal of nuclear waste.A theoretical analysis of the ingredients and content of nuclear waste,particularly long-lived waste in a pressurized water reactor(PWR),will provide important information for future spent fuel *** The present study is an attempt to investigate the yields of isotopes in the neutron-induced fission process and estimate the content of long-lived ingredients of nuclear waste in a *** We combined an approximation of the mass distribution of five Gaussians with the most probable charge model(Zp model)to obtain the isotope yields in the^(235)U(n,f)and^(239)Pu(n,f)*** potential energy surface based on the concept of a di-nuclear system model was applied to an approximation using five Gaussian functions.A mathematical formula for the neutron spectrum in a PWR was established,and sets of differential equations were solved to calculate the content of long-lived nuclides in a *** The calculated isotopic fission yields were in good agreement with the experimental *** for 238U,the contents of^(239)Pu,^(240)Pu,^(241)Pu,^(242)Pu,^(237)Np,^(235)U,and^(236)U are predominant in the PWR after reaching a discharge *** addition,some isotope pairs of heavy nuclei reach a similar value after stabilization,which can be explained by the decay chain and effective fission *** fission fragments,we simulated the content evolution of some long-lived nuclides^(90)Sr,^(107)Pd,^(135)Cs,and their isobars^(90)Rb,^(107)Rh,and^(135)Xe during a fuel cycle in a *** variations in the inventories of uranium and plutonium were in good agreement with the data in Daya *** A new method is proposed for the prediction of the isotopic fission *** inventory of long-lived nuclides was analyzed and predicted after reaching a discharge burnup.

关键词： Radiotoxicity PWR Five Gaussians Long-lived nuclides Fissionfragmentsyields

Effective integration of highly-efficient focusing apodized grating and quantum dots on a solid substrate for scalable quantum photonic circuits

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 99-107页

作者： Beimeng Yao Rongbin su Shunfa Liu Changkun Song ying Yu Jin Liu Xuehua Wang State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China

Recent advancements in quantum photonic circuits have significantly influenced the field of quantum information *** pursuit of an integrated quantum photonic circuit that offers an active,stable platform for large-scale integration and high processing efficiency remains a key *** grating coupler,as a crucial element for an efficient transformation output interface in the integrated quantum photonic circuits,presents significant potential for practical ***,we demonstrate the integration block of a highly efficient shallow-etched focusing apodized grating coupler with indium arsenide(InAs)quantum dots(QDs)in gallium arsenide(GaAs)on a SiO2substrate for active quantum photonic *** designed grating couplers possess a high efficiency over 90% in the broadband(900-930 nm)from the circuit to free space,and a nearly-perfect match with the fiber ***,the efficiency to free space reaches 81.8%,and the match degree with the fiber mode is high up to 92.1%.The proposed integration block offers the potential for large-scale integration of active quantum photonic circuits due to its stable solid substrate and highly performant output for quantum measurements.

关键词： quantum dot grating coupler wafer bonding quantum photonic circuit

Accuracy controlling and mechanical behaviors of precursor-derived ceramic SiOC microlattices by projection micro stereolithography(PμSL)3D printing

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Journal of Advanced Ceramics 2023年第11期12卷 2134-2147页

作者： Ruyue su Jingyi Chen Xueqin Zhang Xiong Gao Wenqing Wang ying Li Rujie He State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structure Institute of Advanced Structure TechnologyBeijing Institute of TechnologyBeijing 100081China

Precursor-derived ceramic SiOC(PDC-SiOC)microlattices exhibit excellent oxidation resistance,high-temperature stability,and superior mechanical ***,the printing accuracy of the PDC-SiOC microlattices by 3D printing is still limited,and mechanical properties of the PDC-SiOC microlattices have not been studied ***,PDC-SiOC octet microlattices were fabricated by projection micro stereolithography(PμSL)3D printing,and photoabsorber(sudan III)’s effect on the accuracy was systematically *** results showed that the addition of sudan III improved the printing accuracy ***,the ceramization process of the green body was analyzed in *** order of the green body decreased,and most of their chemical bonds were broken during *** that,the PDC-SiOC microlattices with different truss diameters in the range of 52–220μm were fabricated,and their mechanical properties were *** PDC-SiOC microlattices with a truss diameter of 52μm exhibited higher compression strength(31 MPa)than those with bigger truss *** size effect among the PDC-SiOC microlattices was *** work provides a deeper insight into the manufacturing of PDC-SiOC micro-scaled architectures by 3D printing and paves a path to the research of the size effect in ceramic structures.

关键词： precursor-derived ceramic(PDC) microlattice projection micro stereolithography(PμSL) accuracy mechanical behaviors

Effect of Silica Fume on the Thaumasite Form of sulfate Attack on Cement-based Materials

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Journal of Wuhan University of Technology(Materials Science) 2017年第5期32卷 1108-1114页

作者：王迎斌贺行洋 su ying HUANG Jian MA Baoguo School of Civil Engineering Architecture and Environment Hubei University of Technology State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology

Thaumasite form of sulfate attack（TSA） can be observed in cement containing limestone under sulfate condition at low temperature. Mixing with suitable mineral admixture could be a good choice to improve the TSA resistance performance of cement-based materials. We investigated the durability performance of limestone-cement mortars reinforced with silica fume（SF） in 5% MgSO_4 solution at 5 ℃. The mortars, which were immersed in aggressive condition, were prepared with 2%, 4%, 6%, 8%, and 10% cement replacement by SF at a fixed water-to-binder ratio. Appearance, compressive strength, change of length and mass and corrosion products were investigated to evaluate the TSA resistance performance of SF based specimens. The results showed that specimens in the absence of SF almost disintegrated. Increasing SF dosage can reduce the degree of deterioration of SF mortars in TSA environment. Mortar mixtures with more than 6% SF merely show slight degeneration in relation to macroscopic and microscopic tests and characterizations.

关键词： thaumasite silica fume degenerations

Aptamer-wrapped gold nanoparticles for the colorimetric detection of omethoate

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Science China Chemistry 2016年第2期59卷 237-242页

作者： Pengjuan Wang ying Wan Aldalbahi Ali Shengyuan Deng Yan su Chunhai Fan Shulin Yang School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China School of Envtronmental and Biologtcal and Engmeermg Nanjing University of Science and Technology Nanjing 210094 China Chemistry Department King Saud Universlty Riyadh 1145 Saudt Arabia Laboratory of Physical Biology Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China

Organophosphorous pesticide(OP) contamination has serious adverse effects on human health and the environment. Due to the toxicity of OPs and the threat presented by their accidental or intentional release in populated areas, the determination and monitoring of these OPs in food products and environment is of great importance. OPs are present in very small quantities and therefore, methods for their detection need to be highly sensitive and selective. Here, we aimed to develop a simple and selective aptamer-based colorimetric assay for the detection of omethoate, which is one of the commonly used OPs. The principle of the assay is that single-stranded DNA(ss DNA)-wrapped gold nanoparticles(Au NPs) are resistant to salt-induced aggregation. By employing an "artificial antibody" organophosphorous pesticide-binding aptamer(OBA) as the recognition element, aptamer-wrapped Au NPs(Au-apta) show high selectivity towards omethoate, resulting in the disconnection of aptamers from Au NPs and the aggregation of Au NPs. As there is a significant color change from the interparticle plasmon coupling during the aggregation of Au NPs, the established assay showed good linearity between 0.1 and 10 μmol/L, with a low detection limit of 0.1 μmol/L. Other OPs such as profenofos, phorate, and isocarbophos would not interfere with the detection of omethoate despite having similar structures. Thus, the colorimetric method shows potential for use in the detection of omethoate in real soil samples.

关键词： aptamer DNA gold nanoparticles omethoate

A Unified Buffering Management with Set Divisible Cache for PCM Main Memory

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Journal of Computer Science & Technology 2016年第1期31卷 137-146页

作者： Mei-ying Bian su-Kyung Yoon Jeong-Geun Kim Sangjae Nam Shin-Dug Kim Department of Computer Science Yonsei University Seoul 120-749 Korea

This research proposes a phase-change memory （PCM） based main memory system with an effective combi- nation of a superblock-based adaptive buffering structure and its associated set divisible last-level cache （LLC）. To achieve high performance similar to that of dynamic random-access memory （DRAM） based main memory, the superblock-based adaptive buffer （SABU） is comprised of dual DRAM buffers, i.e., an aggressive superblock-based pre-fetching buffer （SBPB） and an adaptive sub-block reusing buffer （SBRB）, and a set divisible LLC based on a cache space optimization scheme. According to our experiment, the longer PCM access latency can typically be hidden using our proposed SABU, which can significantly reduce the number of writes over the PCM main memory by 26.44%. The SABU approach can reduce PCM access latency up to 0.43 times, compared with conventional DRAM main memory. Meanwhile, the average memory energy consumption can be reduced by 19.7%.

关键词： memory hierarchy memory structure,cache memory buffer management

Rapid detection of intestinal pathogens in fecal samples by an improved reverse dot blot method

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World Journal of Gastroenterology 2009年第20期15卷 2537-2542页

作者： Jian-Ming Xing su Zhang ying Du Dan Bi Li-Hui Yao Huzhou Maternity and Child Care Hospital Huzhou 313000 Zheiiang Province China

AIM:To develop a new, rapid and accurate reverse dot blot(RDB) method for the detection of intestinal pathogens in fecal ***:The 12 intestinal pathogens tested were Salmonella spp., Brucella spp., Escherichia coli O157:H7, Clostridium botulinum , Bacillus cereus , Clostridium perfringens , Vibrio parahaemolyticus , Shigella spp., Yersinia enterocolitica, Vibrio cholerae, Listeria monocytogenes and Staphylococcus *** two universal primers were designed to amplify two variable regions of bacterial 16S and 23S rDNA genes from all of the 12 bacterial species *** hundred and forty fecal samples from the diarrhea patients were detected using the improved RDB ***:The methods could identify the 12 intestinal pathogens specifi cally, and the detection limit was as low as 103 *** consistent detection rate of the improved RDB assay compared with the traditional culture method was up to 88.75%.CONCLUSION:The hybridization results indicated that the improved RDB assay developed was a reliable method for the detection of intestinal pathogen in fecal samples.

关键词： Immunoblotting Intestinal pathogens Feces

Metabolic strategy of macrophages under homeostasis or immune stress in Drosophila

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Marine Life Science & Technology 2022年第3期4卷 291-302页

作者： Wang Luo sumin Liu Fang Zhang Long Zhao ying su Institute of Evolution and Marine Biodiversity Ocean University of ChinaQingdao 266003China College of Marine Life Sciences Ocean University of ChinaQingdao 266003China Fisheries College Ocean University of ChinaQingdao 266003China Key Laboratory of Mariculture(OUC) Ministry of EducationQingdao 266003China

Macrophages are well known for their phagocytic functions in innate immunity across *** mammals,they rapidly consume a large amount of energy by shifting their metabolism from mitochondrial oxidative phosphorylation toward aerobic glycolysis,to perform the effective bactericidal function upon ***,they strive for sufficient energy resources by restricting systemic *** contrast,under nutrient deprivation,the macrophage population is down-regulated to save energy for *** melanogaster possesses a highly conserved and comparatively simple innate immune ***,recent studies have shown that Drosophila plasmatocytes,the macrophage-like blood cells,adopt comparable metabolic remodeling and signaling pathways to achieve energy reassignment when challenged by pathogens,indicating the conservation of such metabolic strategies between insects and ***,focusing on Drosophila macrophages(plasmatocytes),we review recent advances regarding their comprehensive roles in local or systemic metabolism under homeostasis or stress,emphasizing macrophages as critical players in the crosstalk between the immune system and organic metabolism from a Drosophila perspective.

关键词： Macrophage Drosophila Immune system Metabolism Plasmatocyte

Vector analysis of Contoura Vision for the correction of myopia and myopic astigmatism

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International Journal of Ophthalmology(English edition) 2022年第6期15卷 983-989页

作者： ying Lin Huan-Jun su Mu-Zhi Yuan Yong Zhang Department of Optometry Liuzhou Worker’s HospitalLiuzhou 545005Guangxi Zhuang Autonomous RegionChina Department of Ophthalmology Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250000Shandong ProvinceChina

AIM: To evaluate the visual outcomes of Contoura Vision(CV) with automatic eye tracking system in eyes with myopia and myopic ***: This prospective study included 160 eyes(80 patients) with moderate myopia and irregular astigmatism between January and August 2018. subjects were randomly divided into CV group(80 eyes) that under went CV femtosecond laser-assisted in situ keratomileusis(FS-LASIK) and a control group(80 eyes) that underwent wavefrontoptimized FS-LASIK. Visual outcomes and astigmatic vector analysis were evaluated and compared between preoperatively and 3 mo postoperatively. REsuLTS: Basic details were similar in both groups(P>0.05). At 3 mo postoperatively, uncorrected distance visual acuity was 20/16, 20/20, and 20/25 in 24, 76, and 80 eyes of patients in CV group, respectively. The CV group was better in predictability of astigmatism correction at 3 mo postoperatively. In CV group, 64 eyes had deviation of astigmatic axis within 15° and 28 eyes had deviation of astigmatic axis within 5°, both were better than those in the control group. The number of eyes with residual astigmatism within 0.5 D were less in CV group(48 eyes) than the control group(40 eyes). Compared with the preoperative, C7 significantly reduced to 0.056±0.030 in CV group at 3 mo after the procedure(P<0.05), and were significantly lower than those in the control group(P<0.05).CONCLUSION: CV with automatic eye tracking system is safe and effective for the correction of myopia and myopic astigmatism.

关键词： vector analysis irregular astigmatism Contoura Vision