Syntheses, Structures, and Characterization of Quaternary Tellurites, Li₃MTe₄O₁₁ (M = Al, Ga, and Fe)

Lü,, Minfeng,Jo, Hongil,Oh, Seung-Jin,Lee, Suheon,Choi, Kwang-Yong,Yu, Yang,Ok, Kang Min ACS AMERICAN CHEMICAL SOCIETY 2017 Inorganic Chemistry Vol. No.

<P>Three new quaternary lithium metal tellurites, Li3MTe4O11 (M = Al, Ga, and Fe), have been synthesized through hydrothermal and solid-state reactions by heating a mixture of LiOH center dot H2O, TeO2, and M2O3. The structures of the title compounds have been determined by single-crystal and powder X-ray diffraction. Li3MTe4O11 reveal three-dimensional (3D) frameworks that consist of MO6 octahedra, TeO3 trigonal pyramids, and TeO4 polyhedra. The variable coordination mode of Te4+ within the framework leads to the formation of 1D channels that host Li+ cations on both tetrahedral and octahedral sites. The bulk and grain boundary Li+ ion conductivities for a Li3FeTe4O11 pellet in open air are estimated to be 1.0 x 10(-4) and 2.7 x 10(-6) S cm(-1), respectively, at room temperature from the impedance profile analysis. A lower activation energy of 19.9 kJ mol(-1) is obtained for the system, which is similar to that of Li10GeP2S12 (24 kJ mol(-1)). Detailed characterizations such as thermal, spectroscopic, and magnetic properties for the reported materials are also reported.</P>

Effects of α-Si₃N₄ seeds and sintering additives on properties of porous silicon nitride ceramics fabricated by carbothermal reduction

Yuan Lu,Ji-Qiang Gao,Jian-feng Yang 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.6

In this paper, porous Si3N4 ceramics were fabricated by carbothermal reduction between silicon dioxide and carbon [1]. The influences of α-Si3N4 seeds and sintering additives on the microstructure and mechanical properties of porous Si3N4 ceremics were investigated. XRD analysis proved the complete formation of a single-phase β-Si3N4. SEM analysis showed that the resultant porous Si3N4 ceramics had a fine microstructure and a uniform pore structure. The sintered sample with Lu2O3 as sintering additive showed finer, higher aspect ratio β-Si3N4 grains. The addition of Eu2O3 accelerated the densification of porous Si3N4 ceramics, decreased the porosity and increased the flexural strength. The addition of α-Si3N4 seeds accelerated the formation of the α-Si3N4 phase at a low temperature and the α-β phase transformation process at a high temperature. With an increase in the α-Si3N4 seeds content, the porosity decreased, and the flexural strength increased accordingly. In this paper, porous Si3N4 ceramics were fabricated by carbothermal reduction between silicon dioxide and carbon [1]. The influences of α-Si3N4 seeds and sintering additives on the microstructure and mechanical properties of porous Si3N4 ceremics were investigated. XRD analysis proved the complete formation of a single-phase β-Si3N4. SEM analysis showed that the resultant porous Si3N4 ceramics had a fine microstructure and a uniform pore structure. The sintered sample with Lu2O3 as sintering additive showed finer, higher aspect ratio β-Si3N4 grains. The addition of Eu2O3 accelerated the densification of porous Si3N4 ceramics, decreased the porosity and increased the flexural strength. The addition of α-Si3N4 seeds accelerated the formation of the α-Si3N4 phase at a low temperature and the α-β phase transformation process at a high temperature. With an increase in the α-Si3N4 seeds content, the porosity decreased, and the flexural strength increased accordingly.

Dynamics analysis of novel parallel manipulator with one central rotational actuator and four translational actuators

Yang Lu,Yi Lu,Yang Liu,Bo Hu,Yufeng Gong 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.6

A dynamics analysis of a novel parallel manipulator with one central rotational actuator and four translational actuators is conducted. A 3D model of the parallel manipulator is constructed and its characteristics and DoF are analyzed. The kinematics formulae are derived for solving the displacement, velocity and acceleration of the moving links. The dynamics formulae are derived for solving the inertial wrench of the moving links, the dynamic active forces along the active limbs, the dynamic active torque applied on a central active leg, and the dynamic constrained force exerted on the central active leg. A theoretical numerical example is given to solve the kinematics and dynamics solutions, and the theoretical solutions are verified by the simulation mechanism in Matlab. Finally, a reachable workspace of the novel parallel manipulator is constructed using CAD variation geometry.

A review of the genus Lepteucosma Diakonoff, 1971 (Lepidoptera: Tortricidae: Olethreutinae) in Taiwan, with descriptions of two new species

Lu Yi-Yang,Nasu Yoshitsugu,Hsu Yu-Feng 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.2

Only two species in the tortricid genus Lepteucosma Diakonoff, 1971 is currently recognized, namely L. ceriodes (Meyrick, 1909) and L. shikokuensis (Kawabe, 1984) in Taiwan. Two new species, Lepteucosma blandoides Lu & Hsu, sp. nov. and Lepteucosma dasyueshanensis Lu & Hsu, sp. nov., are found in Taiwan and being described. The key to the Lepteucsoma species in Taiwan is provided, and a checklist of the genus of the world is also given. We also propose a new combination, Lepteucosma yoshiyasui (Kawabe, 1989) comb. nov., based on the genitalia and wing characters. The results of this study increase the number of the Lepteucosma species to 24. Finally, we advocate paying more attention to the insects inhabitng the alpine area of Taiwan. www.zoobank.org/urn:lsid:zoobank.org:pub:10C030E6-905B-4AA5-8595-123AA0290241.

Research on anti‑offset characteristics of magnetic integrated coil structure for IPT system based on radial and tangential orthogonal magnetic fluxes

Yang Lu,Chenyang Xia,Mengmeng Chen,Chenxu Wang,Tao Lu,Yunhai Liu,Hao Lu 전력전자학회 2025 JOURNAL OF POWER ELECTRONICS Vol.25 No.11

In response to the problem of magnetic coupling mechanism deviation during the parking charging of an Automatic Guided Vehicle (AGV), which leads to a significant drop in system output power, this article proposes a magnetic integrated coil structure based on radial and tangential orthogonal magnetic flux. In addition, it optimizes and designs the anti-offset characteristics of a bilateral LCC type Inductive Power Transfer (IPT) system based on secondary magnetic integration technology, effectively solving the problem of power drops after offset. First, select and construct a bilateral LCC circuit topology based on secondary magnetic integration technology, where the secondary compensating inductor coil and the receiving coil share the magnetic circuit. Then, the magnetic integrated coil structure is constructed based on radial and tangential orthogonal magnetic flux. Finally, establish an experimental platform to verify the anti-offset characteristics. When the coupling mechanism is offset to 200 mm along the X/Y-axis direction, the average output power during the offset period is 201.04W, which is higher than the 169.05W in the alignment position. When the coupling mechanism is offset to 200 √2 mm along the Y = ± X direction, the average output power during the offset period is 181.80W, which is higher than the power at the alignment position. This can effectively solve the problem of output power drop after offset and improve the anti-offset characteristics of the IPT system.

Maintaining Drosha expression with Cdk5 inhibitors as a potential therapeutic strategy for early intervention after TBI

Huang Lu,Xia Li,Nie Tiejian,Cui Bozhou,Lu Jianjun,Lu Fangfang,Fan Feiyan,Ren Dongni,Lu Yuan,Gao Guodong,Yang Qian 생화학분자생물학회 2024 Experimental and molecular medicine Vol.56 No.-

Traumatic brain injury (TBI) is a major cause of death and disability in adults. The pathological process of TBI involves a multifactorial cascade in which kinases have been proven contribute to interactions between relevant factors and amplification of signaling cascades. Cyclin-dependent kinase 5 (Cdk5) is a promising kinase that has been implicated in various brain disorders, including TBI. However, the mechanism by which Cdk5 induces neuronal damage remains unclear. Here, we show for the first time that Drosha, a key enzyme in microRNA biogenesis, is a pivotal substrate of abnormally activated Cdk5. Cdk5-mediated phosphorylation decreases Drosha expression and exacerbates nerve injury in TBI. We proved that maintaining Drosha expression via the administration of repurposed Cdk5 inhibitors that were previously studied in clinical trials is a promising approach for the early treatment of TBI. Together, our work identifies Drosha as a novel target for neuroprotective strategies after TBI and suggests Cdk5-mediated regulation of Drosha expression as a potential therapeutic strategy for early TBI intervention.

Fenofibrate Increases Radiosensitivity in Head and Neck Squamous Cell Carcinoma via Inducing G2/M Arrest and Apoptosis

Liu, Jia,Ge, Yang-Yang,Zhu, Hong-Cheng,Yang, Xi,Cai, Jing,Zhang, Chi,Lu, Jing,Zhan, Liang-Liang,Qin, Qin,Yang, Yan,Yang, Yue-Hua,Zhang, Hao,Chen, Xiao-Chen,Liu, Zhe-Ming,Ma, Jian-Xin,Cheng, Hong-Yan,S Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.16

Radiation therapy is an important treatment for head and neck squamous cell carcinoma (HNSCC). However, how to promote radiation sensitivity in HNSCC remains a challenge. This study aimed to investigate the radiosensitizing effects of fenofibrate on HNSCC and explore the underlying mechanisms. HNSCC cell lines CNE-2 and KB were subjected to ionizing radiation (IR), in the presence or absence of fenofibrate treatment. Cell growth and survival, apoptosis and cell cycle were evaluated. In addition, CNE-2 cells were xenografted into nude mice and subjected to IR and/or fenofibrate treatment. The expression of cyclinB and CDK1 was detected by Western blotting. Our results showed that fenofibrate efficiently radiosensitized HNSCC cells and xenografts in mice, and induced apoptosis and G2/M arrest via reducing the activity of the CDK1/cyclinB1 kinase complex. These data suggest that fenofibrate could be a promising radiosensitizer for HNSCC radiotherapy.

New Construction of Short Certificate-Based Signature against Existential Forgery Attacks

( Yang Lu ),( Gang Wang ),( Jiguo Li ),( Jian Shen ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.7

Certificate-based cryptography is a useful public key cryptographic primitive that combines the merits of traditional public key cryptography and identity-based cryptography. It not only solves the key escrow problem inherent in identity-based cryptography, but also simplifies the cumbersome certificate management problem in traditional public key cryptography. So far, four short certificate-based signature schemes have been proposed. However, three of them fail in achieving the existential unforgeability under adaptive chosen-message attacks and the remaining one was not constructed in the normal framework of certificate-based signature. In this paper, we put forward a new short certificate-based signature scheme. The proposed scheme is devised in the normal framework of certificate-based signature and overcomes the security weaknesses in the previous short certificate-based signature schemes. In the random oracle model, we formally prove that it achieves the existential unforgeability against adaptive chosen-message attacks. Performance comparison shows that it is efficient and practical.

Enhanced Certificate-Based Encryption Scheme without Bilinear Pairings

( Yang Lu ),( Quanling Zhang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.2

Certificate-based cryptography is a useful public key cryptographic primitive that combines the merits of traditional public key cryptography and identity-based cryptography. It not only solves the key escrow problem inherent in identity-based cryptography, but also simplifies the cumbersome certificate management problem in traditional public key cryptography. In this paper, by giving a concrete attack, we first show that the certificate-based encryption scheme without bilinear pairings proposed by Yao et al. does not achieve either the chosen-ciphertext security or the weaker chosen-plaintext security. To overcome the security weakness in Yao et al.`s scheme, we propose an enhanced certificate-based encryption scheme that does not use the bilinear pairings. In the random oracle model, we formally prove it to be chosen-ciphertext secure under the computational Diffie-Hellman assumption. The experimental results show that the proposed scheme enjoys obvious advantage in the computation efficiency compared with the previous certificate-based encryption schemes. Without costly pairing operations, it is suitable to be employed on the computation-limited or power-constrained devices.

Type synthesis and kinematics analysis of parallel manipulators with equivalent composite universal joints

Yang Lu,Yi Lu,Canguo Zhang,Nijia Ye 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11

Several novel parallel manipulators (PMs) with equivalent composite universal joints U e are synthesized and their kinematics is studied systematically in this paper. First, the 12 novel PMs with U e are synthesized, and their degrees of freedom are calculated. Second, the structure and merits of the composite limb with U e for constructing the PMs with U e are analyzed; the unified formulas are derived for solving the sub-Jacobian matrix, the sub-Hessian matrix, the angular velocity and the angular acceleration of the composite limb with U e . Third, the formulas are derived for solving the Jacobian matrix and output velocity, the Hessian matrix and output acceleration of the moving platforms of the 10 novel PMs with U e . Finally, a 5-DoF PM with 2U e in the 12 synthesized PMs with U e is illustrated for solving the kinematics of the PMs with U e ; its reachable workspace is constructed for representing merits of the PMs with U e . The theoretical kinematics solutions are verified by the simulation solution of the simulation mechanism of the 5-DoF PM with 2U e .