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Effect of Fe Addition on Dehydrogenation Performance of Methylcyclohexance over Pt/Al_(2)O_(3)
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作者 Tong Fengya Tian Hao +2 位作者 Wang Hao Miao Changxi Song Lei 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2024年第1期12-18,共7页
Catalysts with varying Fe contents were prepared using a sequential impregnation method to investigate the effects of Fe addition on the physicochemical properties of Pt/Al_(2)O_(3) and their performance in methylcycl... Catalysts with varying Fe contents were prepared using a sequential impregnation method to investigate the effects of Fe addition on the physicochemical properties of Pt/Al_(2)O_(3) and their performance in methylcyclohexane(MCH)dehydrogenation.The results demonstrated that the addition of Fe to Pt/Al_(2)O_(3) enhanced the electron density of Pt and improved catalytic activity,while exhibiting negligible influence on the catalytic selectivity for toluene.When the Fe content was 0.057%,the catalyst exhibited the highest MCH consumption rate,which was approximately two times higher than that of the catalyst without Fe.Additionally,the incorporation of Fe inhibited the formation of coke and reduced the quantity of coke deposits on the catalyst,thereby improving its catalytic durability.Overall,Fe shows promise as a prospective secondary element for Pt/Al_(2)O_(3) to enhance the MCH dehydrogenation performance. 展开更多
关键词 methylcyclohexane dehydrogenation hydrogen storage DEACTIVATION Fe addition
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Effect of defatted flaxseed gum powder addition on the quality of sesame paste
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作者 Haichao He Mingkai Sun +5 位作者 Jiahui Wang Yan Tang Yashu Chen Qianchun Deng Qingde Huang Hu Tang 《Oil Crop Science》 CSCD 2024年第1期1-7,共7页
The study explored the influence of defatted flaxseed gum powder(DFGP) on the stability and quality of sesame paste by measuring and analyzing its composition, color, texture, particle size, centrifugal oil separation... The study explored the influence of defatted flaxseed gum powder(DFGP) on the stability and quality of sesame paste by measuring and analyzing its composition, color, texture, particle size, centrifugal oil separation rate,rheological properties, and microstructure. The results showed that the moisture and polysaccharide content of sesame paste was increased as the DFGP increased. Additionally, the hardness, gumminess, and chewiness of the sesame paste was improved, while the presence of particles with small particle size(1–100 μm) was decreased.The rate of oil precipitation was reduced by 28.99% when the amount of DFGP was 6%. The sesame paste samples exhibited pseudoplastic behavior, demonstrating shear thinning. As the shear rate increased, the apparent viscosity of sesame paste gradually decreased. Both the storage modulus(G’) and the loss modulus(G’’) increased as the shear frequency increased. The microstructure observation revealed that protein and oil were evenly distributed in the sesame paste system, and the addition of DFGP enhanced the bonding between oil and protein.This study can provide valuable references for high-quality sesame paste products in the food industry. 展开更多
关键词 Flaxseed gum powder Sesame paste QUALITY addition
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Soil bacterial and fungal communities resilience to long-term nitrogen addition in subtropical forests in China
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作者 Xinlei Fu Yunze Dai +3 位作者 Jun Cui Pengfei Deng Wei Fan Xiaoniu Xu 《Journal of Forestry Research》 SCIE EI CAS CSCD 2024年第2期95-108,共14页
Atmospheric nitrogen(N)deposition is predicted to increase,especially in the subtropics.However,the responses of soil microorganisms to long-term N addition at the molecular level in N-rich subtropical forests have no... Atmospheric nitrogen(N)deposition is predicted to increase,especially in the subtropics.However,the responses of soil microorganisms to long-term N addition at the molecular level in N-rich subtropical forests have not been clarified.A long-term nutrient addition experiment was conducted in a subtropical evergreen old-growth forest in China.The four treatments were:control,low N(50 kg N ha^(-1)a^(-1)),high N(100 kg N ha^(-1)a^(-1)),and combined N and phosphorus(P)(100 kg N ha^(-1)a^(-1)+50 kg P ha^(-1)a^(-1)).Metagenomic sequencing characterized diversity and composition of soil microbial communities and used to construct bacterial/fungal co-occurrence networks.Nutrient-treated soils were more acidic and had higher levels of dissolved organic carbon than controls.There were no significant differences in microbial diversity and community composition across treatments.The addition of nutrients increased the abundance of copiotrophic bacteria and potentially beneficial microorganisms(e.g.,Gemmatimonadetes,Chaetomium,and Aureobasidium).Low N addition increased microbiome network connectivity.Three rare fungi were identified as module hubs under nutrient addition,indicating that low abundance fungi were more sensitive to increased nutrients.The results indicate that the overall composition of microbial communities was stable but not static to long-term N addition.Our findings provide new insights that can aid predictions of the response of soil microbial communities to long-term N addition. 展开更多
关键词 Long-term nitrogen addition Old-growth subtropical forest METAGENOMICS Beneficial microorganisms Co-occurrence network
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Effect of addition temperature on dispersion behavior and grain refinement efficiency of MgO introduced into Mg alloy
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作者 Le ZAI Xin TONG +1 位作者 Yun WANG Xiao-huai XUE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第8期2491-2506,共16页
The effect of addition temperature of MgO particles(MgOp)on their dispersion behavior and the efficiency of grain refinement in AZ31 Mg alloy was investigated.In addition,the grain refinement mechanism was systematica... The effect of addition temperature of MgO particles(MgOp)on their dispersion behavior and the efficiency of grain refinement in AZ31 Mg alloy was investigated.In addition,the grain refinement mechanism was systematically studied by microstructure characterization,thermodynamic calculation,and analysis of solidification curves.The results show that the grain size of AZ31 Mg alloy initially decreases and then increases as the MgOp addition temperature is increased from 720 to 810°C,exhibiting a minimum value of 136μm at 780°C.The improved grain refinement efficiency with increasing MgOp addition temperature can be attributed to the reduced Mg melt viscosity and enhanced wettability between MgOp and Mg melt.Furthermore,a corresponding physical model describing the solidification behavior and grain refinement mechanism was proposed. 展开更多
关键词 grain refinement MgO nucleation particles AZ31 alloy addition temperature dispersion behavior
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Belowground Bud Bank Is Insensitive to Short-Term Nutrient Addition in the Meadow Steppe of Inner Mongolia
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作者 Jin Tao Jiatai Tian +6 位作者 Dongmei Li Jinlei Zhu Qun Ma Zhiming Zhang Jungang Chen Yipeng Liu Jianqiang Qian 《Phyton-International Journal of Experimental Botany》 SCIE 2024年第6期1129-1141,共13页
Human activities and industrialization have significantly increased soil nutrients,such as nitrogen(N)and phos-phorus(P),profoundly impacting the composition and structure of plant community,as well as the ecosystem fu... Human activities and industrialization have significantly increased soil nutrients,such as nitrogen(N)and phos-phorus(P),profoundly impacting the composition and structure of plant community,as well as the ecosystem functions,especially in nutrient-limited ecosystems.However,as the key propagule pool of perennial grasslands,how belowground bud bank and its relationship with aboveground vegetation respond to short-term changes in soil nutrients was still unclear.In this study,we conducted a short-term(2021–2022)soil fertilization experiment with N addition(10 g N m^(-2) yr^(-1))and P addition(5 g N m^(-2) yr^(-1))in the meadow steppe of Inner Mongolia,China,to explore the responses of belowground bud bank,aboveground shoot population and their relationships(represented by the ratio of bud to shoot density-meristem limitation index(MLI))for the whole community and three plant functional groups(perennial rhizomatous grasses-PR,perennial bunchgrasses-PB,and perennial forbs-PF)to nutrient addition.The short-term nutrient addition had no significant influences on belowground bud density,aboveground shoot density,and MLI of the whole plant community.Plant functional groups showed different responses to soil fertilization.Specifically,N addition significantly increased the bud density and shoot density of PR,especially in combination with P addition.N addition reduced the shoot density of PF but had no influence on its bud density and MLI.Nutrient addition had significant effects on the three indicators of PB.Our study indicates that the belowground bud bank and its relationship with aboveground vegetation in temperate meadow steppe are insensitive to short-term soil fertilization,but plant functional groups exhibit specific responses in terms of population regeneration,which implies that plant community composition and ecosystem functions will be changed under the ongoing global change. 展开更多
关键词 Clonal trait population regeneration community dynamics soil resource availability nitrogen addition
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How Prime Numbers Are Interconnected and Built with Two Equations: Addition and Subtraction Rules the Function (6µ)
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作者 John Richard Wisdom 《Advances in Pure Mathematics》 2024年第4期228-241,共14页
Are all prime numbers linked by four simple functions? Can we predict when a prime will appear in a sequence of primes? If we classify primes into two groups, Group 1 for all primes that appear before ζ (such that , ... Are all prime numbers linked by four simple functions? Can we predict when a prime will appear in a sequence of primes? If we classify primes into two groups, Group 1 for all primes that appear before ζ (such that , for instance 5, ), an even number divisible by 3 and 2, and Group 2 for all primes that are after ζ (such that , for instance 7), then we find a simple function: for each prime in each group, , where n is any natural number. If we start a sequence of primes with 5 for Group 1 and 7 for Group 2, we can attribute a μ value for each prime. The μ value can be attributed to every prime greater than 7. Thus for Group 1, and . Using this formula, all the primes appear for , where μ is any natural number. 展开更多
关键词 Number Theory Prime Number Groups Twin Primes Prime Structure and Sequence Prime Subtraction and addition
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Stromal lenticule addition keratoplasty with corneal crosslinking for corneal ectasia secondary to FS-LASIK:a case series
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作者 Li-Xiang Wang Ying-Ping Deng +5 位作者 Meng-Zhen Xie Ke Ma Hong-Bo Yin Qiong Wang Rui Gong Jing Tang 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2024年第3期596-602,共7页
●AIM:To explore the clinical efficacy and safety of stromal lenticule addition keratoplasty(SLAK)with corneal crosslinking(CXL)on patients with corneal ectasia secondary to femtosecond laser-assisted in situ keratomi... ●AIM:To explore the clinical efficacy and safety of stromal lenticule addition keratoplasty(SLAK)with corneal crosslinking(CXL)on patients with corneal ectasia secondary to femtosecond laser-assisted in situ keratomileusis(FS-LASIK).●METHODS:A series of 5 patients undertaking SLAK with CXL for the treatment of corneal ectasia secondary to FS-LASIK were followed for 4-9mo.The lenticules were collected from patients undertaking small incision lenticule extraction(SMILE)for the correction of myopia.Adding a stromal lenticule was aimed at improving the corneal thickness for the safe application of crosslinking and compensating for the thin cornea to improve its mechanical strength.●RESULTS:All surgeries were conducted successfully with no significant complications.Their best corrected visual acuity(BCVA)ranged from 0.05 to 0.8-2 before surgery.The pre-operational total corneal thickness ranged from 345-404μm and maximum keratometry(Kmax)ranged from 50.8 to 86.3.After the combination surgery,both the corneal keratometry(range 55.9 to 92.8)and total corneal thickness(range 413-482μm)significantly increased.Four out of 5 patients had improvement of corneal biomechanical parameters(reflected by stiffness parameter A1 in Corvis ST).However,3 patients showed decreased BCVA after surgery due to the development of irregular astigmatism and transient haze.Despite the onset of corneal edema right after SLAK,the corneal topography and thickness generally stabilized after 3mo.●CONCLUSION:SLAK with CXL is a potentially beneficial and safe therapy for advanced corneal ectasia.Future work needs to address the poor predictability of corneal refractometry and compare the outcomes of different surgical modes. 展开更多
关键词 corneal ectasia femtosecond laserassisted in situ keratomileusis stromal lenticule addition keratoplasty corneal crosslinking corneal thickness corneal biomechanics
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改进RSA算法及二维码在农产品追溯系统的应用
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作者 李冰 王森慧 李雯慧 《中国新技术新产品》 2024年第12期123-127,共5页
随着人们生活水平提升,食品质量安全特别是生鲜水果蔬菜的质量安全受到普遍关注,社会各界都致力于农产品全过程质量安全管控,保障消费者食用安全,农产品追溯技术应运而生。本文运用改进RSA算法,结合二维码技术设计果蔬农产品追溯系统,... 随着人们生活水平提升,食品质量安全特别是生鲜水果蔬菜的质量安全受到普遍关注,社会各界都致力于农产品全过程质量安全管控,保障消费者食用安全,农产品追溯技术应运而生。本文运用改进RSA算法,结合二维码技术设计果蔬农产品追溯系统,重点分析了在果蔬农产品供应链流通过程中的重要环节以及重点溯源信息,应用改进RSA算法保障追溯系统核心数据安全,提升了农产品追溯系统的可靠性和易用性。 展开更多
关键词 rsa算法 二维码 农产品 追溯系统
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RSA算法中大素数快速生成和运算方法实现
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作者 杜俊 《中阿科技论坛(中英文)》 2024年第9期108-112,共5页
RSA算法是目前应用最为广泛的公钥密码算法,其安全性是以大质数因子的分解不存在经典的多项式算法为基础,对极大整数进行因数分解的难度决定了RSA算法的可靠性。密钥的生成需要依赖于大素数,而大数的产生由于其复杂性和计算成本较高,成... RSA算法是目前应用最为广泛的公钥密码算法,其安全性是以大质数因子的分解不存在经典的多项式算法为基础,对极大整数进行因数分解的难度决定了RSA算法的可靠性。密钥的生成需要依赖于大素数,而大数的产生由于其复杂性和计算成本较高,成为影响RSA算法效率的重要因素。文章提出并实现了一种快速产生大数的方法,使用随机数生成器生成指定范围内的随机数,并利用素性测试算法对生成的随机数进行素性验证;针对不符合条件的数值进行调整和重新生成,直至得到符合要求的大素数。测试验证结果表明,文章提出的快速生成大数方法能显著提高大素数生成的效率,大幅缩短大素数的生成时间,有效保证生成数的素性和安全性。 展开更多
关键词 网络安全 rsa 大素数 素性测试 快速生成
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Effect of Home Blood Pressure Telemonitoring Plus Additional Support on Blood Pressure Control:A Randomized Clinical Trial 被引量:1
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作者 MENG Wen Wen BAI Yong Yi +6 位作者 YAN Li ZHENG Wei ZENG Qiang ZHENG Yan Song ZHA Lin PI Hong Ying SAI Xiao Yong 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2023年第6期517-526,共10页
Objective Current clinical evidence on the effects of home blood pressure telemonitoring(HBPT)on improving blood pressure control comes entirely from developed countries.Thus,we performed this randomized controlled tr... Objective Current clinical evidence on the effects of home blood pressure telemonitoring(HBPT)on improving blood pressure control comes entirely from developed countries.Thus,we performed this randomized controlled trial to evaluate whether HBPT plus support(patient education and clinician remote hypertension management)improves blood pressure control more than usual care(UC)in the Chinese population.Methods This single-center,randomized controlled study was conducted in Beijing,China.Patients aged 30-75 years were eligible for enrolment if they had blood pressure[systolic(SBP)≥140 mmHg and/or diastolic(DBP)≥90 mmHg;or SBP≥130 mmHg and/or DBP≥80 mmHg with diabetes].We recruited 190 patients randomized to either the HBPT or the UC groups for 12 weeks.The primary endpoints were blood pressure reduction and the proportion of patients achieving the target blood pressure.Results Totally,172 patients completed the study,the HBPT plus support group(n=84),and the UC group(n=88).Patients in the plus support group showed a greater reduction in mean ambulatory blood pressure than those in the UC group.The plus support group had a significantly higher proportion of patients who achieved the target blood pressure and maintained a dipper blood pressure pattern at the12th week of follow-up.Additionally,the patients in the plus support group showed lower blood pressure variability and higher drug adherence than those in the UC group.Conclusion HBPT plus additional support results in greater blood pressure reduction,better blood pressure control,a higher proportion of dipper blood pressure patterns,lower blood pressure variability,and higher drug adherence than UC.The development of telemedicine may be the cornerstone of hypertension management in primary care. 展开更多
关键词 HYPERTENSION TELEMONITORING Blood pressure control additional support
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Ameliorating the re/dehydrogenation behaviour of MgH2 by zinc titanate addition 被引量:3
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作者 N.A.Ali N.A.Sazelee +4 位作者 M.F.Md Din M.M.Nasef A.A.Jalil Haizen Liu M.Ismail 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第6期2205-2215,共11页
Magnesium hydride(MgH_(2))is the most feasible and effective solid-state hydrogen storage material,which has excellent reversibility but initiates decomposing at high temperatures and has slow kinetics performance.Her... Magnesium hydride(MgH_(2))is the most feasible and effective solid-state hydrogen storage material,which has excellent reversibility but initiates decomposing at high temperatures and has slow kinetics performance.Here,zinc titanate(Zn_(2)TiO_(4))synthesised by the solid-state method was used as an additive to lower the initial temperature for dehydrogenation and enhance the re/dehydrogenation behaviour of MgH_(2).With the presence of Zn_(2)TiO_(4),the starting temperature for the dehydrogenation of MgH_(2)was remarkably lowered to around 290℃–305℃.In addition,within 300 s,the MgH_(2)–Zn_(2)TiO_(4)sample absorbed 5.0 wt.%of H_(2)and 2.2–3.6 wt.%H_(2)was liberated from the composite sample in 30 min,which is faster by 22–36 times than as-milled MgH_(2).The activation energy of the MgH_(2)for the dehydrogenation process was also downshifted to 105.5 k J/mol with the addition of Zn_(2)TiO_(4)indicating a decrease of 22%than as-milled MgH_(2).The superior behaviour of MgH_(2)was due to the formation of Mg Zn_(2),MgO and MgTiO_(3),which are responsible for ameliorating the re/dehydrogenation behaviour of MgH_(2).These findings provide a new understanding of the hydrogen storage behaviour of the catalysed-MgH_(2)system. 展开更多
关键词 Hydrogen storage Solid-state storage MgH_(2) additIVE Zn_(2)TiO_(4)
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Underlying mechanisms of variation in yield asymmetry and strain hardening behavior of extruded pure Mg with Gd addition 被引量:1
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作者 Gyo Myeong Lee Sung Hyuk Park 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第6期2165-2181,共17页
Effects of Gd addition on the strain hardening behavior and yield asymmetry of pure Mg are investigated by subjecting extruded pure Mg,Mg–5Gd,and Mg–15Gd(all in wt%)to tension and compression tests along the extrusi... Effects of Gd addition on the strain hardening behavior and yield asymmetry of pure Mg are investigated by subjecting extruded pure Mg,Mg–5Gd,and Mg–15Gd(all in wt%)to tension and compression tests along the extrusion direction(ED).As the amount of Gd added to pure Mg increases,the basal texture tilts toward the ED and the distribution of c-axes of grains becomes randomized.Under tension,the strain hardening rates of all the materials decrease until fracture.However,under compression,the strain hardening rate increases in the early stage of deformation in pure Mg and Mg–5Gd,whereas it continuously decreases in Mg–15Gd.Pure Mg exhibits considerably high tension-compression yield asymmetry,with a compressive yield strength(CYS)to tensile yield strength(TYS)ratio of 0.4.In contrast,Mg–5Gd exhibits excellent yield symmetry with CYS/TYS of 0.9 and Mg–15Gd exhibits reversed yield asymmetry with CYS/TYS of 1.2.Underlying mechanisms of these drastically different Gd-addition-induced deformation behaviors of the materials are discussed in terms of the crystallographic distribution of grains and the relative activation stresses of basal slip,prismatic slip,pyramidal slip,and{10–12}twinning under tension and compression. 展开更多
关键词 Pure Mg Gd addition TEXTURE Yield asymmetry Activation stress
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有限域上RSA-ELGamal加密及数字签名方案 被引量:2
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作者 杨倩倩 范自强 《哈尔滨商业大学学报(自然科学版)》 CAS 2024年第1期39-44,共6页
基于增强的RSA和ELGamal加密算法,提出了有限域上多项式的RSA-ELGamal加密方案.新的加密方案基于大整数分解问题(IFP)和难解的离散对数问题(DLP)的结合,使其安全性高于单个使用有限域上多项式形式的RSA加密算法和ELGamal加密体制.新提... 基于增强的RSA和ELGamal加密算法,提出了有限域上多项式的RSA-ELGamal加密方案.新的加密方案基于大整数分解问题(IFP)和难解的离散对数问题(DLP)的结合,使其安全性高于单个使用有限域上多项式形式的RSA加密算法和ELGamal加密体制.新提出的加密方案可对多个明文进行加密,在对明文加密时通过引入RSA的公钥对明文进行隐藏,加密效率高,安全性强.在新加密方案基础上引入单向哈希函数,并提出相应的数字签名方案,签名方案利用多个接收者分别验证和加密消息,进一步增强签名被攻击的概率.加密方案和数字签名的安全性主要基于大整数的分解和离散对数求解的双重困难问题,使得签名具有不可攻击性,提高此类签名方案的安全性. 展开更多
关键词 rsa ELGAMAL 数字签名 有限域 IFP DLP
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基于流水线的RSA加密算法硬件实现 被引量:1
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作者 杨龙飞 卢仕 彭旷 《电子技术应用》 2024年第1期66-70,共5页
针对硬件实现高位RSA加密算法成本比较高的问题,在传统的基4蒙哥马利(Montgomery)算法上进行改进。首先引入CSA加法器快速完成大数的加法计算;然后在后处理上做优化,以减少每次蒙哥马利计算的大数个数;最后在计算RSA加密算法时加入了流... 针对硬件实现高位RSA加密算法成本比较高的问题,在传统的基4蒙哥马利(Montgomery)算法上进行改进。首先引入CSA加法器快速完成大数的加法计算;然后在后处理上做优化,以减少每次蒙哥马利计算的大数个数;最后在计算RSA加密算法时加入了流水线,在并行执行RSA加密的条件下降低硬件资源的使用。在Xilinx XC7K410T系列的FPGA开发板上的实验结果表明,在保证加密速率的前提下,改进的RSA加密算法结构使用的硬件资源是原来并行结构的1/2,而且可以在更高的频率下工作。 展开更多
关键词 rsa加密 蒙哥马利算法 FPGA硬件实现 流水线
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Effects of Cu and Co additions on the crystallization and magnetic properties of FeNbB alloy
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作者 于万秋 田博 +2 位作者 张平丽 王佳慧 华中 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第8期486-492,共7页
The nanocrystalline-forming element Cu and magnetic element Co are commonly used as additive elements to tune the structure and improve the properties of alloys.In this study,four kinds of amorphous alloys,Fe_(72)Nb_(... The nanocrystalline-forming element Cu and magnetic element Co are commonly used as additive elements to tune the structure and improve the properties of alloys.In this study,four kinds of amorphous alloys,Fe_(72)Nb_(12)B_(16),Fe_(72)Nb_(12)B_(15)Cu_(1),Fe_(36)Co_(36)Nb_(12)B_(16),and Fe_(36)Co_(36)Nb_(12)B_(15)Cu_(1),were prepared by melt-spinning and annealed at various temperatures to investigate the effects of Cu and Co additions,individually and in combination,on the crystallization and magnetic properties of Fe_(72)Nb_(12)B_(16)alloy.The four kinds of alloys exhibited different crystallization behaviors with different primary crystallization phases observed.For the Fe_(72)Nb_(12)B_(16)alloy,only theα-Mn-type metastable phase formed after annealing.The addition of 1 at.%Cu and 36 at.%Co led to the observation of theα-Mn-type andβ-Mn-type metastable phases,respectively,and a reduction in the crystallization volume fraction in the metastable phase.The Fe_(36)Co_(36)Nb_(12)B_(15)Cu_(1)alloy only exhibitedα-Fe(Co)phase as a primary phase,and the addition of both Cu and Co completely inhibited the precipitation of the metastable phase.Cu clusters were found in energy dispersive spectroscopy elemental maps.Compared with other alloys,Fe_(36)Co_(36)Nb_(12)B_(15)Cu_(1)alloy with both Cu and Co exhibited a lower coercivity(Hc)below 973 K. 展开更多
关键词 alloys NANOCRYSTALLINE Cu addition Co addition
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一种基于模板的RSA-CRT模约减攻击方法
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作者 马向亮 乌力吉 +3 位作者 王宏 张向民 黄克振 刘玉岭 《电子学报》 EI CAS CSCD 北大核心 2024年第3期689-695,共7页
目前针对RSA-CRT的建模类攻击研究较少,本文以模约减操作为研究对象,提出了一种针对RSA-CRT实现的模板攻击方法.该方法的核心是解决了如何由模约减后中间值的汉明重量恢复RSA-CRT私钥的难题.该方法的特点是基于模约减后中间值的汉明重... 目前针对RSA-CRT的建模类攻击研究较少,本文以模约减操作为研究对象,提出了一种针对RSA-CRT实现的模板攻击方法.该方法的核心是解决了如何由模约减后中间值的汉明重量恢复RSA-CRT私钥的难题.该方法的特点是基于模约减后中间值的汉明重量模型建模,通过采集选择密文模约减的能量迹进行模板匹配获取模约减后中间值的汉明重量,由汉明重量变化值恢复中间值,进一步恢复RSA-CRT算法的私钥.另外,该方法的优点在于理想情况下,基于中间值汉明重量模型建立的模板之间可以共用,且对中间值以多少位大小建模没有限制,可以选择字节大小,64位大小,甚至私钥p相同大小,实际环境中可根据泄露信息情况进行选取.最后,本文选择对中间值的最低字节进行建模,验证了该方法的可行性,并给出了防护建议. 展开更多
关键词 模板攻击 rsa-CRT 选择密文 模约减 侧信道攻击
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Interface engineering strategy via electron-defect trimethyl borate additive toward 4.7 V ultrahigh-nickel LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)battery 被引量:1
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作者 Yilin Zhang Yuqing Chen +6 位作者 Qiu He Jinlong Ke Wei Wang Jian-Fang Wu Peng Gao Yanhua Li Jilei Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第5期639-647,共9页
The Li metal battery with ultrahigh-nickel cathode(LiNi_(x)M_(1-x)O_(2),M=Mn,Co,and x≥0.9)under high-voltage is regarded as one of the most promising approaches to fulfill the ambitious target of 400 Wh/kg.However,th... The Li metal battery with ultrahigh-nickel cathode(LiNi_(x)M_(1-x)O_(2),M=Mn,Co,and x≥0.9)under high-voltage is regarded as one of the most promising approaches to fulfill the ambitious target of 400 Wh/kg.However,the practical application is impeded by the instability of electrode/electrolyte interface and Ni-rich cathode itself.Herein we proposed an electron-defect electrolyte additive trimethyl borate(TMB)which is paired with the commercial carbonate electrolyte to construct highly conductive fluorine-and boron-rich cathode electrolyte interface(CEI)on LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)(NCM90)surface and solid electrolyte interphase(SEI)on lithium metal surface.The modified CEI effectively mitigates the structural transformation from layered to disordered rock-salt phase,and consequently alleviate the dissolution of transition metal ions(TMs)and its“cross-talk”effect,while the enhanced SEI enables stable lithium plating/striping and thus demonstrated good compatibility between electrolyte and lithium metal anode.As a result,the common electrolyte with 1 wt%TMB enables 4.7 V NCM90/Li cell cycle stably over 100 cycles with 70%capacity retention.This work highlights the significance of the electron-defect boron compounds for designing desirable interfacial chemistries to achieve high performance NCM90/Li battery under high voltage operation. 展开更多
关键词 NCM90 batteries Electrolyte additive Trimethyl borate
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A facile strategy for tuning the density of surface-grafted biomolecules for melt extrusion-based additive manufacturing applications 被引量:1
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作者 I.A.O.Beeren G.Dos Santos +8 位作者 P.J.Dijkstra C.Mota J.Bauer H.Ferreira Rui L.Reis N.Neves S.Camarero-Espinosa M.B.Baker L.Moroni 《Bio-Design and Manufacturing》 SCIE EI CAS CSCD 2024年第3期277-291,共15页
Melt extrusion-based additive manufacturing(ME-AM)is a promising technique to fabricate porous scaffolds for tissue engi-neering applications.However,most synthetic semicrystalline polymers do not possess the intrinsi... Melt extrusion-based additive manufacturing(ME-AM)is a promising technique to fabricate porous scaffolds for tissue engi-neering applications.However,most synthetic semicrystalline polymers do not possess the intrinsic biological activity required to control cell fate.Grafting of biomolecules on polymeric surfaces of AM scaffolds enhances the bioactivity of a construct;however,there are limited strategies available to control the surface density.Here,we report a strategy to tune the surface density of bioactive groups by blending a low molecular weight poly(ε-caprolactone)5k(PCL5k)containing orthogonally reactive azide groups with an unfunctionalized high molecular weight PCL75k at different ratios.Stable porous three-dimensional(3D)scaf-folds were then fabricated using a high weight percentage(75 wt.%)of the low molecular weight PCL 5k.As a proof-of-concept test,we prepared films of three different mass ratios of low and high molecular weight polymers with a thermopress and reacted with an alkynated fluorescent model compound on the surface,yielding a density of 201-561 pmol/cm^(2).Subsequently,a bone morphogenetic protein 2(BMP-2)-derived peptide was grafted onto the films comprising different blend compositions,and the effect of peptide surface density on the osteogenic differentiation of human mesenchymal stromal cells(hMSCs)was assessed.After two weeks of culturing in a basic medium,cells expressed higher levels of BMP receptor II(BMPRII)on films with the conjugated peptide.In addition,we found that alkaline phosphatase activity was only significantly enhanced on films contain-ing the highest peptide density(i.e.,561 pmol/cm^(2)),indicating the importance of the surface density.Taken together,these results emphasize that the density of surface peptides on cell differentiation must be considered at the cell-material interface.Moreover,we have presented a viable strategy for ME-AM community that desires to tune the bulk and surface functionality via blending of(modified)polymers.Furthermore,the use of alkyne-azide“click”chemistry enables spatial control over bioconjugation of many tissue-specific moieties,making this approach a versatile strategy for tissue engineering applications. 展开更多
关键词 additive manufacturing BLENDING Surface functionalization Surface density Click chemistry HUMAN
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基于自注意力机制和RSA加密的图像融合算法
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作者 吴宗翔 刘立群 《软件工程》 2024年第9期20-25,共6页
传统的红外和可见光图像融合方法在不同环境中的应用效果表现不稳定。针对此问题,提出了一种基于自注意力机制和RSA(Rivest-Shamir-Adleman)加密的图像融合算法。首先,在图像融合部分提出了一种自适应权重学习模块,该模块可以实现动态... 传统的红外和可见光图像融合方法在不同环境中的应用效果表现不稳定。针对此问题,提出了一种基于自注意力机制和RSA(Rivest-Shamir-Adleman)加密的图像融合算法。首先,在图像融合部分提出了一种自适应权重学习模块,该模块可以实现动态权重分配。其次,提出了一种动态密钥管理机制并将其融入RSA加密算法中,将融合后的图像进行加密,提高图片的安全性。实验结果表明,与Densefusion、FusionGAN、IFCNN、TarDAL四种融合方法相比,所提方法的客观评价指标MI、VIF、SSIM、FMIdct、Qabf分别平均提升了16.35%、26.56%、14.58%、18.27%、20.79%。此外,对加密后的图像进行安全性分析,实验表明该算法具有较高的安全性。 展开更多
关键词 自注意力机制 rsa加密算法 图像融合算法 自适应权重学习 图像加密
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Nitrogen addition promotes foliar litterfall and element return in a subtropical forest,southwestern China
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作者 Yue Zhang Shichen Xiong +7 位作者 Chengming You Sining Liu Lixia Wang Li Zhang Han Li Bo Tan Yang Liu Zhenfeng Xu 《Journal of Forestry Research》 SCIE CAS CSCD 2023年第4期939-948,共10页
Nitrogen deposition has a considerable impact on biogeochemical cycling in terrestrial ecosystems.However,how litter production and element return respond to N addition remains poorly understood in nitrogen-rich subtr... Nitrogen deposition has a considerable impact on biogeochemical cycling in terrestrial ecosystems.However,how litter production and element return respond to N addition remains poorly understood in nitrogen-rich subtropical regions.In this study,a 4-year nitrogen addition experiment explored its eff ects on foliar litter production and carbon,nitrogen and phosphorus in a subtropical Michelia wilsonii forest.A clear seasonal pattern in foliar litterfall was observed,regardless of nitrogen treatments,with a peak in spring and a smaller one in autumn.Foliar litter increased with increasing nitrogen but did not aff ect litter carbon concentrations and often decreased nitrogen and phosphorous concentrations.The eff ect of nitrogen addition was dependent on time(month/year).Carbon,nitrogen and phosphorous return showed similar bimodal seasonal patterns.Nitrogen addition increased carbon and nitrogen return but did not aff ect phosphorous.Our results suggest that the addition of nitrogen stimulates carbon and nutrient return via litterfall. 展开更多
关键词 Nitrogen addition LITTERFALL Seasonal patterns Element return Subtropical forest
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