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Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites

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Nano Research 2020年第5期13卷 1339-1346页

作者： Enzheng Shi Shuang cui Nicholas Kempf Qingfeng Xing Thomas chasapis Huazhang Zhu Zhe Li je-Hyeong Bahk G.jeffrey Snyder Yanliang Zhang Renkun chen Yue Wu Department of chemical and Biological Engineering Iowa State UniversityAmesIA 50011USA Ames Laboratory Department of EnergyIowa State UniversityAmesIA 50011USA Department of Mechanical and Aerospace Engineering University of California-San DiegoLa JollaCA 92093USA Buildings and Thermal Sciences center National Renewable Energy LaboratoryGoldenCO 80401USA Department of Aerospace and Mechanical Engineering University of Notre DameNotre DameIN 46556USA Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA Department of Mechanical and Materials Engineering University of CincinnatiCincinnatiOH 45221USA

Anisotropy and inhomogeneity are ubiquitous in spark plasma sintered thermoelectric ***,the origin of inhomogeneity in thermoelectric nanocomposites has rarely been investigated so ***,we systematically study the impact of inhomogeneity in spark plasma sintered bismuth antimony telluride(BiSbTe)thermoelectric nanocomposites fabricated from solution-synthesized *** figure of merit can reach 1.18,which,however,can be overestimated to 1.88 without considering the *** study reveals that the inhomogeneity in thermoelectric properties is attributed to the non-uniformity of porosity,textures and elemental distribution from electron backscatter diffraction and energy-dispersive spectroscopy *** finding suggests that the optimization of bulk material homogeneity should also be actively pursued in any future thermoelectric material research.

关键词： bismuth antimony telluride solution synthesis thermoelectrics inhomogeneity

Important step towards an understanding of the exotic Z_(c)(3900)

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Science china(Physics,Mechanics & Astronomy) 2024年第9期67卷 199-200页

作者： c.Hanhart Institute for Advanced Simulation Forschungszentrum JulichJilich D-52425Germany

The Standard Model of particle physics,which contains the field theories for the electro-weak interaction(QED)and the strong interaction(QcD),is an extremely successful theory describing a huge variety of phenomena at... 详细信息

关键词： interaction atomic describing

Designing New Alloys with High Strength and Ductility

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材料导报 2020年第13期34卷 13003-13004页

作者： c.Suryanarayana Department of Mechanical and Aerospace Engineering University of Central FloridaOrlandoFL.32816-2450U.S.A

Materials scientists have been constantly on the lookout for materials that simultaneously exhibit high strength and good ductility,which is contrary to common wisdom[1].Earlier attempts to achieve this unusual combination have met with limited success[2].Novel approaches such as a duplex microstructure consisting of nanocrystalline and ultrafine grains yielded encouraging results[3].While the nanocrystalline structure provided high strength,the ultrafine-grained(or relatively coarse-grained)structure provided the needed ductility.

关键词： ductility grain strength

EFFEcT OF cHLORIDE ON THE ATMOSPHERIc cORROSION OF SIMULATED ARTIFAcT IRON IN NO_3^- BEARING POLLUTANT ENVIRONMENT

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Acta Metallurgica Sinica(English Letters) 2006年第1期19卷 34-42页

作者： X. cao c.c. Xu Beijing University of chemical Technology Beijing 100029 China

The effect of chloride in nitrogen-bearing pollutant on the atmospheric corrosion of cast iron was investigated by using periodic wet-dry test, electrochemical experiment and surface tension test. Scanning electron microscopy （SEM） with energy disperse atomic X-ray （EDAX） was used to identify the corrosion processes and products. The results of the weight loss measurement showed that the whale corrosion kinetics can be approximately described by： AW=At^8. With the addition of NacI, B increases. The result presented that cI^- accelerated the corrosion rate obviously during the whale corrosion process. The initial corrosion process was investigated from the viewpoint of surface tension. At the initial corrosion period, the corrosion rate was proportion to the adsorption of anions contained the solutions. And as corrosion went on, the penetration effect of anions and different characteristics of the corrosion products began to dominant the corrosion process, which led to the accelerated effect.

关键词： corrosion simulated archaeological iron corrosion rate chloride,nitrogen-bearing pollutant

RFID Anti-counterfeiting for Retailing Systems

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Journal of Applied Mathematics and Physics 2015年第1期3卷 1-9页

作者： Duy-Thinh Tran Sung je Hong Department of computer Science and Engineering Pohang University of Science and Technology (POSTEcH) Pohang Republic of Korea

counterfeiting is one of the most serious problems in the consumer market. One promising approach for anti-counterfeiting is to attach a low-cost Radio-frequency Identification (RFID) tag to the product authentication. In this paper, we propose an RFID system for detecting counterfeiting products. This RFID system consists of the tag authentication protocol and the database correction protocol. We use the tag authentication protocol for authenticating tags without revealing their sensitive information. This protocol also allows the customer to freely inquire the tag. To prevent the widespread of the counterfeit products, we use the tag status information along with tag identity information. Meanwhile, the database correction protocol guarantees the correctness of the tag status. Our anti-counterfeiting system is the first work considering the seller who plays an important role in the consumer product supply chain. Finally, we show that anti-counterfeiting system is quite secure against counterfeiting and the tag authentication protocol is lightweight enough to be implemented in RFID-based applications.

关键词： Secure RFID System Authentication Identification cryptographic One-Way Function counterfeiting Anti-counterfeiting Lightweight

Stercoral perforation of the cecum:A case report

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World Journal of Gastrointestinal Surgery 2024年第4期16卷 1189-1194页

作者： Hung-chun Yu Ta-Wei Pu Jung-cheng Kang chao-Yang chen je-Ming Hu Ruei-Yu Su Department of Surgery Taichung Armed Forces General HospitalTaichung 411228Taiwan Department of Surgery Tri-Service General HospitalNational Defense Medical CenterTaipei 11490Taiwan Division of colon and Rectal Surgery Department of SurgeryTri-Service General Hospital Songshan BranchNational Defense Medical CenterTaipei 105Taiwan Division of colon and Rectal Surgery Department of SurgeryTaiwan Adventist HospitalTaipei 105Taiwan Division of colon and Rectal Surgery Department of SurgeryTri-Service General HospitalNational Defense Medical CenterTaipei 114Taiwan Department of Pathology Tri-Service General HospitalNational Defense Medical CenterTaipei 105Taiwan Department of Pathology and Laboratory Medicine Taoyuan Armed Forces General HospitalTaoyuan 325Taiwan

BAcKGROUND With less than 90 reported cases to date,stercoral perforation of the colon is a rare *** ulceration is thought to occur due to ischemic pressure necrosis of the bowel wall,which is caused by the presence of a stercoraceous *** underscore this urgent surgical situation concerning clinical presentation,surgical treatment,and results,we present the case of a 66-year-old man with a stercoral *** SUMMARY A 66-year-old man with a history of hypertension,hyperlipidemia,and gout presented at the emergency department with lower abdominal pain and a low-grade fever lasting for a few *** computed tomography indicated a suspected bezoar(approximately 7.6 cm)in the dilated cecum,accompanied by pericolic fat stranding,mild proximal dilatation of the ileum,pneumoperitoneum,and minimal ***,feculent peritonitis with isolated cecal perforation were ***,a right hemicolectomy with peritoneal lavage was performed.A histopathological examination supported the intraoperative *** In stercoral perforations,a diagnosis should be diligently pursued,especially in older adults,and prompt surgical intervention should be implemented.

关键词： Acute abdomen colectomy Peritoneal lavage Pneumoperitoneum Bezoars case report

Hot cracking in AZ31 and AZ61 Magnesium Alloy

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Journal of Materials Science & Technology 2011年第7期27卷 633-640页

作者： c.J. Huang c.M. cheng c.P. chou F.H. chen Department of Mechanical Engineering National Chiao Tung University Hsinchu 300 Taiwan China Department of Industrial Education National Taiwan Normal University Taipei 106 Taiwan China

This paper examined the impact of the number of thermal cycles and augmented strain on hot cracking in AZ31 and AZ61 magnesium alloy. Statistical analyses were performed. Following observation using a scanning electron microscope （SEM）, an energy dispersive spectrometer （EDS） was used for component analysis. Results showed that Al content in magnesium alloy has an effect on hot cracking susceptibility. In addition, the nonequilibrium solidification process produced segregation in Al content, causing higher liquid Mg-alloy rich Al content at grain boundaries, and resulting into liquefied grain boundaries of partially melted zone （PMZ）. In summary, under multiple thermal cycles AZ61 produced serious liquation cracking. AZ61 has higher （6 wt%） Al content and produced much liquefied Mg17Al12 at grain boundaries under multiple thermal cycles. The liquefied Mg17Al12 were pulled apart and hot cracks formed at weld metal HAZ due to the augmented strain. Since AZ31 had half the Al content of AZ61, its hot-cracking susceptibility was lower than AZ61. In addition, AZ61 showed longer total crack length （TcL） in one thermal cycle compared to that in three thermal cycles. This phenomenon was possibly due to high-temperature gasification of Al during the welding process, which resulted in lower overall Al content. consequently, shorter hot cracks exhibited in three thermal cycles. It was found the Al content of AZ31 and AZ61 can be used to assess the hot-cracking susceptibility.

关键词： Varestraint test Thermal cycles Hot-cracking susceptibility Gas tungsten arc welding (GTAW) AZ31 AZ61

硼对有序态Ni_3Fe合金氢气环境中氢脆敏感性的影响

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南京大学学报（自然科学版） 2009年第2期45卷 241-247页

作者：马杰陈业新 Liu c T 上海大学材料研究所上海 200072 田纳西大学材料科学与工程系美国TN37996-2200

硼含量(0.01～0.06wt.%B)对有序态Ni-24at.%Fe合金在真空和氢气环境中的力学性能有较大的影响,对有序态Ni3Fe合金在氢气环境中的氢脆敏感性也有较大的作用.研究结果表明,加硼后有序Ni3Fe合金的晶粒尺寸得到细化,材料的强韧性提高;硼有... 详细信息

硼含量(0.01～0.06wt.%B)对有序态Ni-24at.%Fe合金在真空和氢气环境中的力学性能有较大的影响,对有序态Ni3Fe合金在氢气环境中的氢脆敏感性也有较大的作用.研究结果表明,加硼后有序Ni3Fe合金的晶粒尺寸得到细化,材料的强韧性提高;硼有效抑制了有序态Ni-24at.%Fe合金在氢气环境中的氢脆.当合金中硼含量为0.06wt.%时,有序态Ni3Fe合金在氢气环境中的氢脆因子(IH2)为1%,与无硼Ni3Fe合金相比,合金氢脆因子的下降幅度达到98.7%.在氢气环境中拉伸时,无硼有序态Ni3Fe合金的断口形貌为完全的沿晶断口;随着Ni3Fe合金中硼含量的增加,合金断口形貌中的沿晶断口所占比例逐渐减少;当合金中的硼含量大于0.03wt.%后,断口形貌变为全部塑性的韧窝状断口.合金的断口形貌变化表明,有序态Ni3Fe合金中的硼提高了合金的晶界强度.硼对有序态Ni3Fe合金在氢气环境中力学性能和氢脆因子的作用变化表明,硼对有序态Ni3Fe合金中由氢气诱发的环境氢脆有较强的抑制作用.

关键词： Ni3Fe金属间化合物环境氢脆硼含量

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药物反应中新的组织病理学发现

国外医学（皮肤性病学分册） 1993年第4期19卷 215-219页

作者： Fitzpatrick je 靳培英

对近十年来发现的药疹(如药物诱发的色素沉着、化疗引起的淋巴细胞复原的皮肤发疹、肢端红斑、皮肤白消安效应、中性粒细胞性汗腺炎以及汗腺的鳞状化生等)以及炎症性药疹(如角层下脓疱性药疹、天疱疮样综合征、假性卟啉症、光敏性发疹... 详细信息

对近十年来发现的药疹(如药物诱发的色素沉着、化疗引起的淋巴细胞复原的皮肤发疹、肢端红斑、皮肤白消安效应、中性粒细胞性汗腺炎以及汗腺的鳞状化生等)以及炎症性药疹(如角层下脓疱性药疹、天疱疮样综合征、假性卟啉症、光敏性发疹、巨噬细胞性苔藓样皮炎、假性蕈样肉芽肿综合征以及注射维生素 K_1引起的假性硬皮病等)作了临床与组织病理变化的详细描述.

关键词：药物性皮炎组织病理学