Value of Porous Titanium Alloy Plates for Chest Wall Reconstruction after Resection of Chest Wall Tumors

Qi, Yu,Li, Xin,Zhao, Song,Han, Yong Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.11

Objective: To explore the value of porous titanium alloy plates for chest wall reconstruction after resection of chest wall tumors. Materials and Methods: A total of 8 patients with chest wall tumors admitted in our hospital from Jan. 2006 to Jan. 2009 were selected and underwent tumor resection, then chest wall repair and reconstruction with porous titanium alloy plates for massive chest wall defects. Results: All patients completed surgery successfully with tumor resection-induced chest wall defects being $6.5{\times}7cm{\sim}12{\times}15.5$ cm in size. Two weeks after chest wall reconstruction, only 1 patient had subcutaneous fluidify which healed itself after pressure bandaging following fluid drainage. Postoperative pathological reports showed 2 patients with costicartilage tumors, 1 with squamous cell carcinoma of lung, 1 with lung adeno-carcinoma, 1 with malignant lymphoma of chest wall, 2 with chest wall metastasis of breast cancers and 1 with chest wall neurofibrosarcoma. All patients had more than 2~5 years of follow-up, during which time 1 patient with breast cancer had surgical treatment due to local recurrence after 7 months and none had chest wall reconstruction associated complications. The mean survival time of patients with malignant tumors was ($37.3{\pm}5.67$) months. Conclusions: Porous titanium alloy plates are safe and effective in the chest wall reconstruction after resection of chest tumors.

Improvement of Yield Asymmetry and Enhancement of Mechanical Properties of Extruded AZ110 Alloy with La-Rich Misch Metal Addition

Qiyu Liao,Wenxin Hu,Qichi Le,Xingrui Chen,Yanchao Jiang 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5

In this paper, effects of the La-rich MM (Misch Metal) on the microstructure, texture and mechanical properties of extrudedAZ110 alloy during tension and compression deformation were investigated. High strength and low tension–compressionyield asymmetry of AZ110MM alloy (AZ110 alloy with La-rich MM addition) are developed by hot extrusion. The additionof La-rich MM brings Al-RE phases (Al2(La, Ce) and Al11(La, Ce)3) to the as-cast AZ110 alloy, which play an importantrole in the grain refinement and texture weakening during extrusion deformation. Such grain refinement and texture weakeningobviously inhibit the nucleation and growth of twins and make the deformation mechanism change from twinning tomultiple slip during cold compression deformation. Furthermore, the Al-RE phases also improve the tension–compressionyield asymmetry performance of the extruded AZ110 alloy via the combining effects of grain refinement, texture weakeningand the transformation from twinning to multiple slip. Moreover, the extruded AZ110MM alloy shows much higher strengthover AZ110 alloy, owning to texture effect, grain boundary strengthening and precipitation strengthening.

Load-transferring mechanism and evaluation theory of bolt with single and double nut fasteners

Qiyu Li,Dachang Zhang,Hao Xu,Yibi Li,Weiqun Chen,Kaixuan Zhang 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.86 No.2

The use of the ordinary double nut (i.e., ODN) composed of a master nut (i.e., M-nut) and a slave nut (i.e., S-nut) is a highly efficient method to prevent bolts loosening. A novel double nut (i.e., FODN) composed of a master nut (i.e., M-nut) and flat slave nut (i.e., FS-nut) is proposed to save raw materials. The bolt fastening tests with single nut, ODN and FODN are performed to investigate the preload and counterbalance forces. Corresponding finite element analysis (FEA) models are established and validated by comparing the preload with the experimental results. The load-bearing capacity, the extrusion effect, and the contact stress of each engaged thread for ODN and FODN are observed by FEA. The experimental and simulated results revealed that the bolt fastening with double-nut has different load-transferring mechanisms from single-nut. Nevertheless, for double-nut/bolt assemblies, the FS-nut can provide load transfer that is like that of the S-nut, and the FODN is a reasonable and reliable fastening method. Furthermore, based on the theory of Yamamoto, a formula considering the extrusion effect is proposed to calculate the preload distribution of the double-nut, which is applicable to varying thicknesses of slave-nuts in double-nut/bolt assemblies.

Matrimonial Property Law in China: Developments, Controversy and Solutions

Ran Qiyu 한국가족법학회 2013 가족법연구 Vol.27 No.3

중국에서 부부재산법은 혼인법을 개정할 때마다 뜨거운 논쟁의 주제가 되어 왔다. 1950년 중화인민공화국 혼인법이 제정된 이래 부부재산법은 혼인 중 부부 쌍방이 이룩한 재산에 대한 제도 제정, 사유재산 범위의 명확한 규정, 부부공동재산제도의 점진적인 개선, 불이익을 받는 배우자 보호제도 제정 등 많은 발전을 이루어 왔다. 2011년 발표된 중국대법원의 혼인법 적용에 대한 판례 평석 Ⅲ은 학자와 법조인 사이에서 부부재산법 해석에 있어 뜨거운 논쟁을 촉발했는데 특히 논란이 되었던 부분은 부부재산법에 따른 여성을 포함해 취약 계층 보호 방법, 물권법과 거래에 관련 규정으로 부터의 부부재산법 제외 범위, 대법원의 사법주의 한계였다. 본 연구는 중국 내 부부재산법에 관한 논란을 해결할 수 있는 해결방안으로 남녀 간의 평등한 법적 지위 신장, 가족과 부부의 특수성 보호를 위해 부부공동재산권 및 거래에 관한 규칙의 제한, 부부와 가족의 특정한 이익 보호를 위한 개인의 권리 제한, 대법원의 사법주의 제한을 제시한다.

Study on the Impact of Silicon Doping Level on the Trench Profile Using Metal-Assisted Chemical Etching

Zhe Cao,Qiyu Huang,Chuanrui Zhao,Qing Zhang 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6

Metal-assisted chemical etching (MACE) has been used as a promising alternativemethod to fabricate micro/nano-structures on silicon substrates inexpensively. In thispaper, profiles of deep trenches on silicon substrates, with different doping levels,fabricated by MACE were studied. A layer of interconnected gold islands was firstdeposited onto the silicon substrate as catalyst. Electrochemical etching was thenperformed in a hydrofluoric acid (HF) and hydrogen peroxide (H2O2) mixturesolution with different HF-to-H2O2 ratio ρ (ρ = [HF]/([HF] + [H2O2])). Vertical deeptrenches were fabricated successfully by using this method. It was observed thateven under identical experimental condition, sidewalls with various tilting anglesand different morphology could still form on silicon substrates with differentresistivity. This possibly because with different resistivity silicon substrate, thegradient of holes in it greatly changed, and so did the final morphology. As a result,the tilting angle of etched trench sidewall can be tuned from 6 ° to 96 ° using siliconsubstrates with different resistivity and etchants with different ρ. By applying theangle-tuning technique revealed in this study, high aspect ratio patterns with verticalsidewalls could be fabricated and three-dimensional complex structures could bedesigned and realized in the future.

Discrete theory of rolling elements for a cageless ball bearing

Yanling Zhao,Qiyu Wang,Mingzhu Wang,Chengyi Pan,Yudong Bao 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.4

For the case of magnetic levitation loss, the rotor of an active magnetic bearing is forced by gravity to drop onto stator laminations, and cageless touchdown bearings with high rigidity and load-bearing capacity ensure back-up support. However, the contact collision of rolling elements in a cageless bearing will lead to deterioration of bearing performance and instability of the rotor system. For this purpose, a method based on noncontact between adjacent rolling elements in cageless bearings is proposed in this paper. First, combined with space geometry, the contact process and the change in radius of rotation when a rolling element passes through a discrete groove are analysed, and a clearance between the adjacent rolling elements is generated by changing the rotation speed. Based on this, a design principle for setting a discrete groove on an outer ring raceway is proposed, and the equation for the circumferential discrete clearance for the rolling element based on bearing kinematics is given. Combined with the characteristics of discrete groove structures, a differential equation for the discrete dynamics of rolling elements with variable stiffness coefficients is proposed. We then determine the influence of the discrete groove structure on the discrete motion of the rolling element and bearing dynamic characteristics. Third, the dynamics simulation is combined with a vibration characteristics experiment and discrete motion experiment for a rolling element in a cageless bearing. Our research results show that a discrete groove design for the raceway can be used to realize stable discrete motion of the rolling element, and that such a discrete groove structure will not adversely affect the vibration characteristics of the bearing. The feasibility of the discrete design of cageless bearings with rolling element is verified, and theoretical guidance for the development and application of cageless bearings is provided.

Analytical Solution for Settlement of Homogeneous Structure where the Tunnel Passes Underneath and Its Application

Yuan Mei,Qiyu Song 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.9

Based on Winkler elastic foundation beam theory, Peck modified formula and Laplace transform are used to solve the approximate differential equation of the deflection curve. The settlement calculation method for important homogeneous structures where the tunnel passes underneath is studied. The analytical solution for the settlement of the homogeneous structure is derived and verified. The field monitoring and numerical analysis results are compared. Laplace transform method requires fewer parameters to solve the approximate differential equation of the deflection curve, and its calculation efficiency is high, and the result is the same as that of the classical literature. The method can be applied to practical engineering, and satisfactory results can be obtained. The analytical process in this paper provides a reference for solving similar problems, and the solution can be used for ground settlement and providing an early warning for settlement when the underground engineering passes through the important homogeneous structure from below.

Contralateral Suppression at Adrenal Venous Sampling Is Associated with Renal Impairment Following Adrenalectomy for Unilateral Primary Aldosteronism (Endocrinol Metab 2021;36:875-84, Ye Seul Yang et al.)

Zhimin Tan,Qiyu He,Liang Zhou 대한내분비학회 2022 Endocrinology and metabolism Vol.37 No.6

Comparative Study on Microstructure and Aluminum Distribution Between Laser Beam Welding and Electron Beam Welding of Ti–6Al–4V Alloy Plates

Hengchang Bu,Qiyu Gao,Yun Li,Feiyun Wang,Xiaohong Zhan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9

Ti–6Al–4V alloy plates with a thickness of 4 mm were joined by electron beam welding (EBW) and laser beam welding(LBW). The comparison of LBW and EBW was performed according to grain morphology, microstructure, aluminum distribution,and microhardness of the joints. Results indicate that compared with LBW joint, more equiaxed grains are observedaround the central zone of the EBW joint. The microstructure in fusion zone (FZ) of EBW joint presents more uneven withobviously coarser acicular martensite α′. Moreover, the aluminum element content of EBW joint is substantially lower,which demonstrates a more significant burning loss behavior in EBW process. The lower aluminum content in the uppercenter areas of the joints is attributed to the more significant element burning loss caused by higher temperature, whereasmore uniform aluminum distribution in the upper part of the joints is ascribed to stronger convection form within the upperpart of the joint. In addition, the characteristics of convection and thermal field within the molten pool are recognized asvital factors influencing the aluminum distribution. The lower microhardness profile in FZ of the EBW joint is principallyattributed to coarser acicular martensite α′ and lower aluminum element in EBW joint.

Prediction of methane emission from sheep based on data measured in vivo from open-circuit respiratory studies

Tao Ma,Kaidong Deng,Qiyu Diao 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.9

Objective: The current study analysed the relationships between methane (CH4) output from animal and dietary factors. Methods: The dataset was obtained from 159 Dorper×thin-tailed Han lambs from our seven studies, and CH4 production and energy metabolism data were measured in vivo by an open-circuit respiratory method. All lambs were confined indoors and fed pelleted diet during the whole experimental period in all studies. Data from two-thirds of lambs were used to develop linear and multiple regressions to describe the relationship between CH4 emission and dietary variables, and data from the remaining one third of lambs were used to validate the established models. Results: CH4 emission (g/d) was positively related to dry matter intake (DMI) and gross energy intake (GEI) (p<0.001). CH4 energy/GEI was negatively related to metabolizable energy/gross energy and metabolizable energy/digestible energy (p<0.001). Using DMI to predict CH4 emission (g/d) resulted in a coefficient of determination (R2) of 0.80. Using GEI, digestible energy intake, and metabolizable energy intake predict CH4 energy/GEI resulted in a R2 of 0.92. Conclusion: the prediction equations established in the current study are useful to develop appropriate feeding and management strategies to mitigate CH4 emissions from sheep.