|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Formation mechanisms and control method for stray grains at melt-back region of Ni-based single crystal seed显示文摘An experimental study together with numerical simulation was conducted to investigate the formation mechanisms and control methods for stray grains at melt-back of seed in this paper.The numerical simulation results showed that the convex solid/liquid(S/L)interface changed very slowly into a concave interface during the initial solidification stage and the undercooling was slightly affected by the S/L curvature change.The formation of stray grains below melt-back interface at seed perimeter could be suppressed with the decrease of clearance between the seed and mold.However when the clearance was further decreased to 0,an orientation deviation layer formed originated from the deformation of un-melted seed caused by different expend coefficient between the seed and mold.The nucleation of stray grains above the melt-back interface at the seed perimeter could be suppressed using the mold with small surface roughness.The isolated un-melted dendrite stem at semi-solid mushy of the seed with the large original primary dendrite spacing transfer to complex network structure,suppressing the formation of the stray grains,when the primary dendrite spacing of seed decreased or the seed underwent solution heat treatment.Then,the formation mechanisms of the stray grains at the melt-back region are discussed based on above results,and a method is proposed to suppress the formation of the stray grains for preparing single crystal components by re-used seed . | Songsong Hu Wenchao Yang Zhuoran Li Hanyuan Xu Taiwen Huang Jun Zhang Haijun Su Lin Liu | 2021 | Progress in Natural Science:Materials International2021，31，4： | 2 |
| 2 | Structures and defects of WO 3? x nanorods grown by in-situ heating tungsten filament显示文摘 | Huairuo Zhang Min Feng Fei Liu Libao Liu Hanyuan Chen Hongjun Gao Jianqi Li | 2004 | Chemical Physics Letters2004，，4： | 1 |
| 3 | Understanding the commonalities and differences in genomic organizations across closely related bacteria from an energy perspective显示文摘The availability of a large number of sequenced bacterial genomes facilitates in-depth studies about why genes(operons)in a bacterial genome are globally organized the way they are.We have previously discovered that(the relative)transcription-activation frequencies among different biological pathways encoded in a genome have a dominating role in the global arrangement of operons.One complicating factor in such a study is that some operons may be involved in multiple pathways with different activation frequencies.A quantitative model has been developed that captures this information,which tends to be minimized by the current global arrangement of operons in a bacterial(and archaeal)genome compared to possible alternative arrangements.A study is carried out here using this model on a collection of 52 closely related Escherichia coli genomes,which revealed interesting new insights about how bacterial genomes evolve to optimally adapt to their environments through adjusting the(relative)genomic locations of the encoding operons of biological pathways once their utilization and hence transcription activation frequencies change,to maintain the above energy-efficiency property.More specifically we observed that it is the frequencies of the transcription activation of pathways relative to those of the other encoded pathways in an organism as well as the variation in the activation frequencies of a specific pathway across the related genomes that play a key role in the observed commonalities and differences in the genomic organizations of genes(and operons)encoding specific pathways across different genomes. | MA Qin CHEN Xin LIU Chao MAO XiZeng ZHANG HanYuan JI Fei WU ChunGuo XU Ying | 2014 | Science China(Life Sciences)2014，57，11： | 1 |
| 4 | Contamination and human health risk assessment of heavy metal(loid)s in topsoil and groundwater around mining and dressing factories in Chifeng,North China显示文摘Chifeng is a concentrated mining area for non-ferrous metal minerals,as well as a key prevention and control area for heavyduty enterprises.This situation necessitates an efective ecological and human health risk assessment of heavy metal(loid)s driven by the wide distribution of metal ore processing,mining,and smelting factories in Hexigten Banner and Bairin Left Banner.We conducted surveys to assess the levels of heavy metal(loid)s(Cr,As,Pb,Cd,and Hg)in the topsoil and groundwater of the areas.The results indicated that the concentrations of As,Cd,and Pb in partial soil samples exceeded the environmental quality standards of Grade II.Based on contamination assessments,such as geoaccumulation indices and pollution indices,we inferred that Cd,Pb,and As were primary pollutants in topsoil.Potential ecological risks when considered as part of the average risk indices(RI)are up to 1626.40 and 2818.76,respectively,in the two areas.Comparative analysis revealed that Cd posed a very high potential ecological risk,followed by As.Moreover,the evaluation showed that the three exposure pathways of carcinogenic and non-carcinogenic risk followed a descending order:inhalation>ingestion>dermal contact,except for Pb.Arsenic in topsoil posed a potential non-carcinogenic risk to human health,while there were no adverse efects of As in groundwater.In addition,the average total carcinogenic risk for As in the two areas,as well as the risk of Pb in the topsoil of Bairin Left Banner and all the fve heavy metal(loid)s in groundwater,exceeded human tolerance.Pb–Zn mines caused higher human health risks.In addition,the tandem contamination of heavy metal(loid)s in soil and groundwater was not obvious.This research study provides a basis for pollution remediation to control heavy industry-induced ecological and health risks of heavy metal(loid)s. | Di Zhao Qiang Wu Yifan Zeng Juan Zhang Aoshuang Mei Xiaohui Zhang Shuai Gao Hanyuan Wang Honglei Liu Yong Zhang Shuai Qi Xu Jia | 2023 | International Journal of Coal Science & Technology2023，10，1： | 0 |
| 5 | Implementing hardware primitives based on memristive spatiotemporal variability into cryptography applications显示文摘Implementing hardware primitives into cryptosystem has become a new trend in electronic community.Memristor,with intrinsic stochastic characteristics including the switching voltages,times and energies,as well as the fluctuations of the resistance state over time,could be a naturally good entropy source for cryptographic key generation.In this study,based on kinetic Monte Carlo Simula-tion,multiple Artificial Intelligence techniques,as well as kernel density map and time constant analysis,memristive spatiotemporal variability within graphene based conductive bridging RAM(CBRAM)have been synergistically analyzed to verify the inher-ent randomness of the memristive stochasticity.Moreover,the ran-dom number based on hardware primitives passed the Hamming Distance calculation with high randomness and uniqueness,and has been integrated into a Rivest-Shamir-Adleman(RSA)cryptosystem.The security of the holistic cryptosystem relies both the modular arithmetic algorithm and the intrinsic randomness of the hardware primitive(to be more reliable,the random num-ber could be as large as possible,better larger than 2048 bits as NIST suggested).The spatiotemporal-variability-based random number is highly random,physically unpredictable and machinelearningattack resilient,improving the robustness of the entire cryptosystem. | Bo Liu Yudi Zhao YinFeng Chang Han Hsiang Tai Hanyuan Liang Tsung-Cheng Chen Shiwei Feng Tuo-Hung Hou Chao-Sung Lai | 2023 | Chip2023，2，1： | 0 |
| 6 | Corrigendum to“Implementing hardware primitives based on memristive spatiotemporal variability into cryptography applications”[Chip 2(2023)100040]显示文摘The authors regret that to remove the YinFeng Chang,Han Hsiang Tai,Tsung-Cheng Chen,Tuo-Hung Hou,Chao-Sung Lai from the originalauthor list. | Bo Liu Yudi Zhao Hanyuan Liang Shiwei Feng | 2023 | Chip2023，2，4： | 0 |
| 7 | Modelling of cantilever bank failure for peat-type meander bends in the source region of the Yellow River显示文摘Bank retreat involving a combination of fluvial erosion and bank collapse has been found to be a major contributor to sediment transport,lateral migration,and planform evolution of meandering rivers.Previous studies have largely examined the general mechanism of cantilever bank failure.However,the composite process of beam(toppling)failure caused by shear failure of the lower part composed of noncohesive soil remains poorly understood.The current paper investigates the diversity and coupling of this collapse process,which is the dominant pattern in the peat-type meandering rivers of the Zoige River basin in the source region of the Yellow River.For this purpose,morphologic and hydraulic measurements were done in the summers of 2016 and 2017.Moreover,a combined method of a theoretical model and numerical simulation was developed to be applied for a continuous meandering channel in the Zoige basin,focusing in particular on five typical cross sections of a highly convoluted bend approaching neck cutoff.Specifically,the theoretical model evaluating the stability of overhanging riverbank was based on static equilibrium theory considering the interaction between composite soil layers.In addition,the Bank Stability and Toe Erosion Model was used to simulate the retreat process of the silt layer based on field measurements including bank morphology,soil composition,and hydrological parameters.Thus,a calculation method for the occurrence of cantilever beam failure in the flood period is proposed,and temporal change and spatial variability in bank profiles caused by three consecutive failures is estimated at the five sections.Satisfactory results showed a relatively close agreement between the calculations and field measurements in terms of the width of the overhanging arms and the dimensions of the slump blocks. | Hanyuan Yang Zhiwei Li Yongjun Lu Huaixiang Liu Liqin Zuo | 2023 | International Journal of Sediment Research2023，38，3： | 0 |
| 8 | The Research Progress of Biodegradable Zn-Based Alloys Used for Medical Application显示文摘Biodegradable medical device which can be completely degraded and disappear after the healing of human body tissues would avoid a second surgical procedure to remove the temporary parts for fixation.Zn ion is a vital nutrient and anti-inflammatory factor for life.Zn ion can be absorbed and have no poisonous side effects during degradation of the Zn-based alloys.And zinc is widely | Chang Wang Hanyuan Liu Zhentao Yu | 2016 | 功能材料信息2016，13，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员