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Multi-relaxation-time lattice Boltzmann front tracking method for two-phase flow with surface tension

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Chinese Physics B 2012年第12期21卷 310-316页

作者：谢海琼曾忠张良奇梁功有 hiroshi mizuseki Yoshiyuki Kawazoe Department of Engineering Mechanics Chongqing University State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Institute for Materials Research Tohoku University

In this paper, an improved incompressible multi-relaxation-time lattice Boltzmann-front tracking approach is proposed to simulate two-phase flow with a sharp interface, where the surface tension is implemented. The lattice Boltzmann method is used to simulate the incompressible flow with a stationary Eulerian grid, an additional moving Lagrangian grid is adopted to track explicitly the motion of the interface, and an indicator function is introduced to update the fluid properties accurately. The interface is represented by using a four-order Lagrange polynomial through fitting a set of discrete marker points, and then the surface tension is directly computed by using the normal vector and curvature of the interface. Two benchmark problems, including Laplace＇s law for a stationary bubble and the dispersion relation of the capillary wave between two fluids are conducted for validation. Excellent agreement is obtained between the numerical simulations and the theoretical results in the two cases.

关键词： lattice Boltzmann method multi-relaxation-time front tracking method surface ten- sion two-phase flow

An improved lattice Boltzmann model for incompressible flow

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An improved lattice Boltzmann model for incompressible flow

Current-Voltage Characteristics of Molecular Devices at Low Bias

23rd International Congress of Theoretical and Applied Mechanics

作者： Liangqi Zhang Zhong Zeng Haiqiong Xie Gongyou Liang hiroshi mizuseki Yoshiyuki Kawazoe Department of Engineering Mechanics Chongqing University Institute for Materials Research Tohoku University

Based on the Hermite expansion technique,an improved incompressible lattice Boltzmann model is *** the model, the incompressible Navier-Stokes equations can be derived from both the Boltzmann-BGK equation and the latt...

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Chinese Physics Letters 2004年第7期21卷 1247-1250页

作者： LIAOYun-Xing CHENHao R.Note H.mizuseki Y.Kawazoe NationalKeyLaboratoryofSurfacePhysics FudanUniversityShanghai200433 physicsDepartment FudanUniversityShanghai200433 InstituteforMaterialsResearch TohokuUniversitySendai980-8577Japan

We use density functional theory and the Green function formalism with charge energy effect included in the self-consistent calculation of the I-V characteristics of a single benzene ring with an appendage of cf3, and identify some interesting properties of the I-V characteristics at low bias. The molecule picks up a fractional charge at zero bias, then the additional fractional charge produces a barrier on the junction of the molecule and contacts to perturb current flow on the molecule. This phenomenon may be useful for the design of future molecular devices.

关键词： Electronics and devices

Stage IV malignant transformation of mature cystic teratoma palliatively treated with concurrent chemoradiotherapy:A case report

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World Journal of Clinical Cases 2025年第1期13卷 56-61页

作者： Saori Kondo Takashi Suzuki Kanato Yoshiike Sakura Yamanaka Kenta Sonehara hiroshi Nabeshima Osamu Oguchi Department of Obstetrics and Gynecology Saku Central Hospital Advanced Care CenterSaku City 385-0051NaganoJapan

BACKGROUND Malignant transformation(MT)of mature cystic teratoma(MCT)has a poor prognosis,especially in advanced *** chemoradiotherapy(CCRT)has an inhibitory effect on *** SUMMARY Herein,we present a case in which CCRT had a reduction effect preoperatively.A 73-year-old woman with pyelonephritis was referred to our *** tomography revealed right hydronephrosis and a 6-cm pelvic *** ultrasound-guided fine-needle biopsy(EUS-FNB)revealed squamous cell *** patient was diagnosed with MT of *** to her poor general con-dition and renal malfunction,we selected CCRT,expecting fewer adverse *** CCRT,her performance status improved,and the tumor size was reduced;surgery was *** months postoperatively,the patient developed dis-semination and lymph node *** chemotherapy was *** died 18 months after treatment *** EUS-FNB was useful in the diagnosis of MT of MCT;CCRT suppressed the disea-se and improved quality of life.

关键词： Mature cystic teratoma Malignant transformation Squamous cell carcinoma Concurrent chemoradiotherapy Endoscopic ultrasound-guided fine-needle biopsy Case report

Emergence of resistance to carbocyclic oxetanocin G in herpes simplex virus type 1 and genetic analysis of resistant mutants

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Acta Pharmacologica Sinica 2004年第7期25卷 75-80页

作者： hiroshi SHIOTA Department of Ophthalmology Japan School of Medicine The University of Tokushima Tokushima 770

AIM: To elucidate the potentiality of emergence of drug-resistance to carbocyclic oxetanocin G (***-G ), a new effective antiviral drug for herpetic keratitis during treatment and the mechanism of this drug resistance. METHODS: A ***-G resistant strain (***-Gr) was established by serially propagating the herpes simplex virus (HSV) -1 in African green monkey kidney (VERO) cells in the presence of ***-G. After the drug sensitiv- ity assay and the thymidine kinase (TK) activity assay, the molecular basis for the drug resistance was studied using polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) analysis and PCR direct se- quencing technology. RESULTS: After the 10th passage in 10 μm ***-G, the ED50 of the ***-Gr was 17.08-fold greater than that of the original strain on the average and the TK activities of these resistant strains were extremely reduced. PCR-SSCP analysis on TK gene of the wild HSV-1 and the ***-Gr showed altered migration patterns in part 3 and part 4, while PCR-SSCP analysis on DNA polymerase gene showed no difference among the viruses. Sequence analysis revealed a deletion of G at position of 430 that caused frameshift, resulting in premature termination in the TK gene. CONCLUSION: The drug resistance to ***-G may appear during the treatment due to the deficiency of TK activity caused by a single mutation in the TK gene of HSV-1.

关键词： carbocyclic oxetanocin G human herpesvirus 1 viral drug resistance thymidine kinase

Chiral ligand-protected gold nanoclusters: Considering the optical activity from a viewpoint of ligand dissymmetric field

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Progress in Natural Science:Materials International 2016年第5期26卷 428-439页

作者： hiroshi Yao Graduate School of Material Science University of Hyogo

Chirality is a geometric property of a physical, chemical, or biological object, which is not superimposable on its mirror image. Its significant presence has led to a strong demand in the development of chiral drugs, sensors,catalysts, and photofunctional materials. In recent years, chirality of nanoscale organic/inorganic hybrids has received tremendous attention owing to potential applications in chiral nanotechnology. In particular, with the recent progress in the syntheses and characterizations of atomically precise gold nanoclusters protected by achiral thiolates, atomic level origins of their chirality have been unveiled. On the other hand, chirality or optical activity in metal nanoclusters can also be introduced via the surface chiral ligands, which should be universal for the nanosystems. This tutorial review presents some optically-active metal(gold) nanoclusters protected by chiral thiolates or phosphines, and their chiroptical(or circular dichroism; CD) properties are discussed mostly from a viewpoint of the ligand dissymmetric field scheme. The examples are the gold nanoclusters protected by(R)-/(S)-2-phenylpropane-1-thiol,(R)-/(S)-mercaptosuccinic acid, phenylboronateD/L-fructose complexes, phosphine sulfonate-ephedrinium ion pairs, or glutathione. Some methodologies for versatile asymmetric transformation and chiroptical controls of the nanocluster compounds are also *** the dissymmetric field model as the origin of optical activity, the chiroptical responses of the gold nanoclusters are strongly associated with coupled oscillator and/or CD stealing mechanisms based on the concept of induced CD(ICD) derived from a perturbation theory, so on this basis, some characteristic features of the observed CD responses of chiral ligand-protected gold nanoclusters are presented in detail. We believe that various kinds of origins of chirality found in ligand-protected gold nanoclusters may provide models for understanding those of many related nanomater

关键词： Chiral ligand Monolayer-protected gold nanoclusters Dissymmetric field model Induced CD Asymmetric transformation Alloying effect

Microglial cathepsin B as a key driver of inflammatory brain diseases and brain aging

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Neural Regeneration Research 2020年第1期15卷 25-29页

作者： hiroshi Nakanishi Department of Pharmacology Faculty of Pharmacy Yasuda Women’s University

Interleukin-1βis a potent proinflammatory cytokine that plays a key role in the pathogenesis of the brain aging and diverse range of neurological diseases including Alzheimer’s disease,Parkinson’s disease,stroke and persistent *** microglia are the main cellular source of interleukin-1βin the *** B is associated with the production and secretion of interleukin-1βthrough pyrin domain-containing protein 3 inflammasome-independent processing of procaspase-3 in the *** leakage of cathepsin B from the endosomal-lysosomal system during aging is associated with the proteolytic degradation of mitochondrial transcription factor A,which can stabilize mitochondrial ***,microglial cathepsin B could function as a major driver for inflammatory brain diseases and brain *** active and blood-brain barrier-permeable specific inhibitors for cathepsin B can be potentially effective new pharmaceutical interventions against inflammatory brain diseases and brain aging.

关键词： brain aging caspase-1 cathepsin B inflammatory brain diseases interleukin-1β microglia mitochondrial transcription factor A neuroinflammation nuclear factor-κB oxidative stress

EXPERIMENTAL STUDY AND MODELING OF PRESSURE LOSS FOR FOAM-CUTTINGS MIXTURE FLOW IN HORIZONTAL PIPE

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Journal of Hydrodynamics 2011年第4期23卷 431-438页

作者： AMNA Gumati hiroshi Takahshi Graduate School of Environmental Studies Tohoku University

In this study, we first sought to elucidate foam rheology to describe foam flow behavior, and then to experimentally investigate the pressure losses for both foam and foam-cuttings flow in a horizontal pipe by considering both varied foam qualities of 80%, 85% and 90% and foam velocities. Also, a two-layer numerical model to predict pressure loss was developed based on experimental observations of cuttings behavior. Results show that the foam behaves like a power-law fluid. Furthermore, and the pressure loss significantly increases as foam velocity increases, while the delivered cuttings concentration dramatically decreases. Moreover, results indicate that both the pressure loss and the delivered cuttings concentration increase with foam quality. Comparisons between the experimental results and numerical model predictions show satisfactory agreement.

关键词： foam rheology pressure loss horizontal pipe cuttings concentration two-layer model

Multiple carcinosarcomas of the esophagus with adenocarcinomatous components: A case report

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World Journal of Gastroenterology 2020年第17期26卷 2111-2118页

作者： hiroshi Okamoto hiroshi Kikuchi hiroshi Naganuma Takashi Kamei Department of Gastroenterological Surgery Graduate School of MedicineTohoku UniversitySendai 980-8574Japan Department of Surgery South Miyagi Medical CenterMiyagi 989-1253Japan Department of Pathology Sendai City HospitalSendai 982-8502Japan

BACKGROUND Carcinosarcoma(spindle cell carcinoma) of the esophagus is an extremely rare event;the etiology and origins of this neoplasm have not yet been ***-mesenchymal transition(EMT) has been associated with invasion and metastasis, and may be related to the generation of a stem cell population within this *** SUMMARY We present the case of a 61-year-old male with nausea and fever. Upper gastrointestinal endoscopy revealed the presence of type 1 and 0-Ⅱc lesions located 35 cm from the incisors toward the esophago-gastric *** esophagectomy was performed. Macroscopic analysis revealed three polypoid lesions in the abdominal esophagus that accompanied the main lesion in the lower thoracic esophagus and 0-Ⅱc lesions that spread continuously with them. Histologically, the lesions included proliferating spindle cells. Adenocarcinomatous components were detected in a section near the foot, and squamous cell carcinoma was identified in the mucosa at the base of the *** patient was diagnosed with multiple carcinosarcomas, staged at pT1b(SM3),pN1(#110, #7), cM0, Stage Ⅱ(sarcomatous metastasis to the lymph nodes).Spindle cells did not express E-cadherin but were positive for EMT markers,including zinc finger E-box-binding homeobox 1, TWIST, and snail family transcriptional repressor 2. The patient has experienced no recurrence at 5 years and 2 mo after *** This report suggests that multiple sarcomatous tumors may be generated from primary squamous cell carcinoma via mechanisms related to EMT.

关键词： Esophagus Multiple carcinosarcomas Multiple spindle cell carcinomas Epithelial-mesenchymal transition Epithelial-mesenchymal transition markers Case report