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Journal of Materials Science & Technology 2004年第5期20卷 561-566页

作者： RuihengWU XueyuRUAN HongbingZHANG T.y.hsu DepartmentofPlasticityTechnology ShanghaiJiaoTongUniversityShanghai200030China Departmentof.MaterialsEngineering ShanghaiInstituteofTechnologyShanghai200233China SchoolofMaterialsScieuceaudEugineering ShanghaiJiaoTougUuiversityShanghai200030China

By combining the α/γ interface migration and the carbon diffusion at the interface in Fe-c alloys, a mathematical model is constructed to describe the mixed-control mechanism for proeutectoid ferrite formation from austenite. In this model, the α/γ interface is treated as non-equilibrium interface, i.e., the carbon concentration of austenite at γ/α interface is obtained through theoretical calculation, instead of that assumed as the local equilibrium concentration. For isothermal precipitation of ferrite in Fe-c alloys, the calculated results show that the rate of interface migration decreases monotonically during the whole process, while the rate of carbon diffusion from γ/α interface into austenite increases to a peak value and then decreases. The process of ferrite growth may be considered as composed of three stages: the period of rapid growth, slow growth and finishing stage. The results also show that the carbon concentration of austenite at γ/α interface could not reach the thermodynamic equilibrium value even at the last stage of ferrite growth.

关键词： Proeutectoid ferrite precipitation Non-equilibrium interface Phase transformation kinetics Mixed-control mechanism

Effect of Laser Welding on Properties of Dissimilar Joint of Al-Mg-Si and Al-Mn Aluminum Alloys

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Journal of Materials Science & Technology 2010年第3期26卷 276-282页

作者： c.c.chang c.P.chou S.N.hsu G.y.Hsiung J.R.chen Department of Mechanical Engineering National Chiao-Tung University National Synchrotron Radiation Research center Department of Biomedical Engineering and Environmental Sciences National Tsing-Hua University

This study discusses the welding properties for the components of an aluminum-alloy ultra-high vacuum chamber and beam position monitor （BPM）.The welding parameters include the modes of laser output （pulsed wave and continuous wave）,welding speed,shield gas flow,welding bead structure,and focusing *** results showed that the welding defect rate of the pulsed wave type was larger than that of the continuous wave *** crack in the welding bead reduced with decreasing welding *** fusion penetration of the welding bead was higher when the focusing distance was long enough to deepen into the welding *** morphology during the experimental process revealed the proper flow of shield *** adaptability design of the welding bead structure in the preceding processes had more effect on overall welding structure and morphology.

关键词： Laser welding Aluminum alloy Ultra-high vacuum Beam position monitor (BPM)

A Refinement of Hilbert’s Double Series Theorem

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Journal of Mathematical Research with Applications 1991年第1期 143-144页

作者： L.c.hsu y.J.Wang Dalian University of Technology Liaoning Normal University

The object of this note is to prove the followingTheorem Let{a}and{b}be sequences of real numbers such that0<∑∑a<+∞and0<∑b<+∞.Then we have the inequalitysum from m=1 to∞sum from n=1 to∞ab/m+n<{sum from n=1 to∞... 详细信息

The object of this note is to prove the followingTheorem Let{a}and{b}be sequences of real numbers such that0ysum from m=1 to∞sum from n=1 to∞ab/m+n<{sum from n=1 to∞(π-θ/na}/2{sum from n=1 to∞(π-θ/nb}/2 （1）whereθ=3/2-1=1.121320343.

关键词： A Refinement of Hilbert s Double Series Theorem

The Structure of the Kuenlunkuan Granodiorite and its Relation to the Formation of the Ore-bearing Quartz Veins

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地质学报 1943年第Z1期 77-85+87-88页

作者： y.c.hsu Institute of Geology Academia Simica

The Kuenlunknan Granodiorite, whick occurs slightly to the west of the apex of the Kuangi are, is exposed at the southern end of the Tamingshan anticline. The mass is injeated into the Lower Devonian and Pre-Devonian ... 详细信息

关键词： In The Structure of the Kuenlunkuan Granodiorite and its Relation to the Formation of the Ore-bearing Quartz Veins

Martensitic Transformation in Fe-Mn-Si Based Shape Memory Alloys

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Journal of Materials Science & Technology 1999年第2期15卷 111-116页

作者： T. y. hsu (XU Zuyao)(Shanghai Jiao Tong University, Shanghai 200030, china) Shanghai Jiao Tong University Shanghai 200030 China chinese Academy of Sciences China

The critical driving force for martensitic transformation fcc ( gamma ) yields hcp ( epsilon ) in ternary Fe-Mn-Si alloys increases with the content of Mn and decreases with that of Si. Thermodynamical prediction of M//s in ternary Fe-Mn-Si alloys was established. The fcc ( gamma ) yields hcp ( epsilon ) martensitic transformation in Fe-Mn-Si is a semi-thermoelastic and the nucleation process does not strongly depend on soft mode. Nucleation occurs directly through an overlapping of stacking fault rather than pole mechanism, and it is suggested that stacking fault energy (SFE) is the main factor controlling nucleation. Based on the phenomenological theory of martensite crystallography, a shuffle on (0001)//h//c//p plane is required when d//1//1//1 does not equal d//0//0//0//2. The derived principal strain in Bain distortion is smaller, i, e., more reasonable than the values given by christian. Alloying elements strengthening the austenite, lowering SFE of gamma phase and reducing T//N** gamma temperature may be beneficial to shape memory effect of Fe-Mn-Si based alloys. Accordingly, Fe-Mn-Si-RE and Fe-Mn-Si-cr-N (or Fe-Mn-Si-Ni-cr-N) are worthy to be recommended as shape memory materials with improved shape memory effect. (Edited author abstract) 48 Refs.

关键词： Mn Martensitic Transformation in Fe-Mn-Si Based Shape Memory Alloys Fe Si

Adult metaplastic hutch diverticulum with robotic-assisted diverticulectomy and reconstruction:A case report

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World Journal of clinical cases 2020年第20期8卷 4895-4901页

作者： che H yang yi S Lin yen c Ou Wei c Weng Li H Huang chin H Lu c.ao y hsu Min c Tung Department of Surgery Division of UrologyTungs’Taichung MetroHarbor HospitalTaichung City 435403Taiwan

BAcKGROUND Hutch diverticulum arises from the compromised muscular development at the ureteral *** is a congenital disease and extremely rare in adult,only accounting for about 3%occurrence *** can be either symptomatic or asymptomatic,and relies on image tools for diagnosis and preoperative *** for surgery are dependent on the complications from the *** is about 10%among those with hutch diverticulum,and it still has chances turning into malignancy,especially urothelial cell *** SUMMARy A 27-year-old man was presented with frequently recurrent urinary tract infection for one year,and had suffered from intermittent right flank pain for 3 *** past medical histories were recorded *** obvious abnormalities on laboratory data and urine examination were *** ultrasound,right hydronephrosis was seen and an anatomical abnormality was observed on intravenous *** computed tomography urogram showed one diverticulum seated at superolateral side of right ureteral *** was done and biopsy results showed focal *** discussing with him,roboticassisted diverticulectomy with reconstruction was *** hydronephrosis was greatly improved after *** has completed his 1.5-year follow-ups,and no malignancies were seen from urine cytology and image of intravenous *** Robotic-assisted diverticulectomy and reconstruction to hutch diverticulum is a safe and efficient operation,providing several advantages over open and laparoscopic ones.

关键词： Diverticulum complications Urinary bladder abnormalities Diverticulum surgery Robotic surgical procedures methods Treatment outcome case report

Eight-year follow-up of locally advanced lymphoepithelioma-like carcinoma at upper urinary tract: A case report

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World Journal of clinical cases 2020年第19期8卷 4505-4511页

作者： che H yang Wei c Weng yi S Lin Li H Huang chin H Lu c.ao y hsu yen c Ou Min c Tung Department of Surgery Division of UrologyTungs'Taichung MetroHarbor HospitalTaichung City 435403Taiwan

BAcKGROUND Urinary tract lymphoepithelioma-like carcinoma is rarely *** it is termed after lymphoepithelioma at the nasopharynx,it behaves more like high grade urothelial carcinoma by immunohistochemical *** published literatures focused on its rarity but few discussed results of long-term *** no available guidelines are applicable,we postulated that principles should be similar to that of urothelial carcinoma at urinary *** of now,this work features the longest follow-up of this cancer at the upper urinary *** SUMMARy A 63-year-old female had a chief complaint of intermittent left flank pain for 2 mo,along with accompanying symptoms including vomiting and body weight loss,about 7 kg over 2 *** data showed normocytic anemia,mildly poor renal function,and *** analysis showed mild *** tomography showed a 4.2-cm-width irregular mass over left renal pelvic and enlarged lymph node at the left renal ***-body bone scan was negative of active bone *** from ureteroscopy showed urothelial *** from laparoscopic nephroureterectomy with bladder cuff resection showed lymphoepithelioma-like carcinoma with muscular invasion(pT3).She took adjuvant chemotherapies of 2 cycles and full courses of radiation *** recurrence was observed with designed investigative *** Locally advanced urinary tract lymphoepithelioma-like carcinoma could benefit from nephroureterectomy and bladder cuff excision in terms of recurrence-free survival.

关键词： Urologic neoplasms pathology Kidney pelvis Tomography X-ray computed carcinoma mortality Kidney neoplasms mortality case report

THEORETIcAL PREDIcTION OF THE KINETIcS cURVES OFPEARLITIc TRANSFORMATION IN HyPO-PROEUTEcTOID STRUcTURAL STEELS

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Acta Metallurgica Sinica(English Letters) 1998年第3期11卷 215-224页

作者： Z.G.Li H.B.chang T.y.hsu Z.y.Xu X.y.Ruan Shanghai Jiaotong Univ Shanghai China

Supposing carbon contents of ferrite phases in pearlite precipitating from austenite in multicomponent steel at temperature T and in Fe-c ystem at T' are the same the pearlite formation temperature diference, can be calculated from the FeX phase diagrams and the equilibrium temperature Al. Using Tp and Fe-c binary thermodynamic model, the driving forces for phase transformation from austenite to pearlite in multicomponent steels have been successfully calculated. Through the combination of simplified Zener and Hillert's model for pearlite growth with Johnson-Mehl equation, using data from known TTT diagrams, the interfacial energy parameter and activation energy for pearlite formation can be determined and expressed as functions of chemical composition in steels by regression analysis. The calculated starting curves of pearlitic transformation in some commercial steels agree well with the experimental data.

关键词： pearlite formation temperature difference interfacial energy parameter activation enerpy for pearlite transformation,Johnson-Mehl equation

THEORETIcAL PREDIcTION OF PROEUTEcTOID FERRITIcTRANSFORMATION IN HyPO-PROEUTEcTOID STRUcTRAL STEELS

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Acta Metallurgica Sinica(English Letters) 1998年第3期11卷 207-214页

作者： H.B.chang Z.G.Li T.y.hsu Z.y.Xu X.y.Ruan Shanghai Technical coll of Metallurgy Shanghai China

Proeutectoid ferrite with carbon content xo precipitating from austenite in a multicomponent steel at temperature T is supposed to be equivalent to proeutectoid ferrite with the same carbon content precipitating from austenite in Fe-c binary system at temperature T'.is described as the temperature difference of proeutectiod ferrite formation, and can be calculated from the Fe-X diagrams and the equilibrium temperature A3. By introducing Tf and basing on the thermodynamic model for Fe-c binary alloy, the driving force for phase transformation from austenite to proeutectoid ferrite in multicomponent steels has been successfully calculated. Through the Johnson-Mehl equation and using the data hem known TTT diagrams, the relationship between the chemical composition and the intedecial edenly packeter as well as activation energy for proeutectoid ferrite formation can be calculated. The starting curves of proeutectoid ferritic transformation calculated in this way in some hypo-proeutectoid structural steels agree well with the erperimental data.

关键词： proeutectoid ferrite formation temperature difference interfacial enerpy parameters activation energy for diffusion Johnson-Mehl equation

Exact recession velocity and cosmic redshift based on cosmological principle and yang-Mills gravity

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chinese Physics c 2019年第10期43卷 105-111页

作者： Leonardo hsu Jong-Ping hsu college of Education and Human Development University of MinnesotaMinneapolisMN 55455USA Department of Chemistry and PhysicsSanta Rosa Junior CollegeSanta RosaCA 95401USA Department of Physics University of Massachusetts DartmouthNorth DartmouthMA 02747-2300USA

Based on the cosmological principle and quantum yang-Mills gravity in the super-macroscopic limit, we obtain an exact recession velocity and cosmic redshift z, as measured in an inertial frame F≡F(t,x,y,z). For a matter-dominated universe, we have the effective cosmic metric tensor Gμν(t)=(B^2(t),-A^2(t),-A^2(t),-A^2(t)), A∝B∝t^1/2, where t has the operational meaning of time in F frame. We assume a cosmic action S≡Scos involving Gμν(t) and derive the ‘Okubo equation’ of motion, G^μν(t)■μS■νS-m^2=0, for a distant galaxy with mass m. This cosmic equation predicts an exact recession velocity, r=rH/[1/2+√1/4+r^2H^2/c0^2]co, where H=A(t)/A(t) and co=B/A, as observed in the inertial frame F. For small velocities, we have the usual Hubble's law r≈rH for recession velocities. Following the formulation of the accelerated Wu-Doppler effect, we investigate cosmic redshifts z as measured in F. It is natural to assume the massless Okubo equation, G^μν(t)■μψe■νψe=0, for light emitted from accelerated distant galaxies. Based on the principle of limiting continuation of physical laws, we obtain a transformation for covariant wave 4-vectors between and inertial and an accelerated frame, and predict a relationship for the exact recession velocity and cosmic redshift, z=[(1+Vr)/(1-Vr^2)1/2]-1, where Vr=r/coctions of the cosmic model are consistent with experiments for small velocities and should be further tested.

关键词： yang-Mills gravity recession velocity speed limit of recession velocity redshift