A new plesiomorphic species of webspinner (Embiodea, Clothodidae) from mid-Cretaceous Kachin amber of northern Myanmar

Chen Xinyu,Zhang Huachuan 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2

A new Mesozoic webspinner (Embiodea) is described and figured based on a moderately well-preserved male in mid-Cretaceous (earliest Cenomanian) amber from northern Myanmar. Perissoclothoda myrrhokaris gen. et sp. nov. is the second fossil representative of the putatively primitive family Clothodidae. It differs from the Cretaceous and more recent Embiodea in several plesiomorphic characters, namely a quadrate mentum, approximately oval submentum, subgenae not meet medially (thus a ventral bridge or gula is lacking), completely symmetrical terminalia, and dimerous cerci. This new find sheds further light on the diversity and morphological disparity of fossil webspinners during the Late Mesozoic. www.zoobank.org/urn:lsid:zoobank.org:pub:11A49D4A-4042-4AA3-858F-919E1A84B87

Xylazole inhibits NO-cGMP pathway in fetal rat nerve cells

Xinyu Wang,Yue Wu,Lin Liu,Hui Bai,Zhiheng Zhang,Mingchao Zhao,Tianwen Ma,Xiaopeng Song,Lina Jia,Liangyu Lv,Yue Yu,Xinyu Xu,Hong Chen,Li Gao 대한수의학회 2022 Journal of Veterinary Science Vol.23 No.1

Background: Xylazole (Xyl) is a veterinary anesthetic that is structurally and functionally similar to xylazine. However, the effects of Xyl in vitro remain unknown. Objectives: This study aimed to investigate the anesthetic mechanism of Xyl using fetal rat nerve cells treated with Xyl. Methods: Fetal rat nerve cells cultured for seven days were treated with 10, 20, 30, and 40 μg/ mL Xyl for 0, 5, 10, 15, 20, 25, 30, 45, 60, 90, and 120 min. Variations of amino acid neurotransmitters (AANTs), Nitric oxide-Cyclic GMP (NO-cGMP) signaling pathway, and ATPase were evaluated. Results: Xyl decreased the levels of cGMP and NO in nerve cells. Furthermore, Xyl affected the AANT content and Na+-K+-ATPase and Ca2+-Mg2+-ATPase activity in nerve cells. These findings suggested that Xyl inhibited the NO-cGMP signaling pathway in nerve cells in vitro. Conclusions: This study provided new evidence that the anesthetic and analgesic effects of Xyl are related to the inhibition of the NO-cGMP signaling pathway.

Efficient degradation of imidacloprid in wastewater by a novel p-n heterogeneous Ag2O/BiVO4/diatomite composite under hydrogen peroxide

Jing Chen,Qifang Ren,Chunshan Xu,Bin Chen,Shaohua Chen,Yi Ding,Zhen Jin,Wanmi Guo,Xinyu Jia 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

In this study, Ag2O/BiVO4/diatomite composite with p-n heterojunction structure was synthesized bysimple hydrothermal method with diatomite as carrier. It was found that under the action of hydrogenperoxide (H2O2), the imidacloprid (IMD) could be effectively degraded by the composite. Systemic evaluationswas conducted on effects of pH value, catalyst dosage, H2O2 concentration, initial IMD concentration,and anion on how effeciently this new photocatalytic composite can degrade IMD. The results showthat the p-n heterojunction formed between the two contact surfaces of Ag2O nanoparticle and BiVO4promotes the charge transfer between the interfaces, inhibits recombination of electrons and holes,and thus significantly improves the catalytic performance. The stability and reusability of Ag2O/BiVO4/diatomite composites were tested with ICP experiment and cyclic experiment. Active substancecapture experiment and ESR reveal the photocatalytic reaction mechanism and confirm that superoxideradical (O2), hydroxyl radical (OH), and h+ can promote the degradation of IMD. The degradation productsand the intermediates of IMD were identified through LC-MS, on a basis of which the possible transformationpathway was proposed. In situ synthesis of p-type Ag2O and n-type BiVO4 heterojunctioncomposites has opened a new direction for photocatalytic degradation of organic pollutants.

First principles study of monolayer Sb2S2Te and a mathematical model of a thin-film thermoelectric generator with maximum power point tracing

Liu Xinyu,Yuan Shaoheng,Gu Bo,Chen Qiongxuan,Pu Xinyu,Zhang Jiangtao 한국물리학회 2022 Current Applied Physics Vol.36 No.-

The result of the structural, electronic and thermoelectric performance of monolayer Sb2S2Te, which is a brannew material, is calculated by using the method of full-potential linearized augmented plane-wave (FP-LAPW), and the exchange-correlation potential selected in this paper is generalized gradient approximation (GGA) scheme. There are no negative frequencies in the calculated phonon spectra, which demonstrates that dynamics of monolayer Sb2S2Te is stable in theory. The average value of lattice thermal conductivity (κl) is smaller than that of other thermoelectric (TE) materials, and monolayer Sb2S2Te has larger figure of merit (ZT) comparing with other well-known materials. According to the TE parameters (Seebeck coefficient S, electrical conductivity σ, electronic thermal conductivity κe and lattice thermal conductivity κl) of monolayer Sb2S2Te, an idealized model of thermoelectric generator (TEG) and a realistic model of maximum power point tracking (MPPT) are built. In addition, this paper studies the influence of different temperature zones, different temperature differences, cross sectional area, height and the number of P–N junction on output power and conversion efficiency of TEG. The results of physical calculation and simulation models show that the conversion efficiency of TEG of monolayer Sb2S2Te is larger than or close to that of other well-known materials, and the tracking accuracy of MPPT proposed in this paper is higher than or close to that of other researches.

Bimodal-Structured Al–Mg Alloy with High Strength and Ductility Processed by High Strain Rate Rolling at Medium Temperature

Xinyu Li,Weijun Xia,Jihua Chen,Hongge Yan,Zhenzhen Li,Bin Su,Min Song 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12

A bimodal grain distribution is generated in the Al-6.5Mg alloy deformed by high strain rate rolling (HSRR) at 320 °C, inwhich the fine grains with the average size of 2.1 μm and the coarse grains with the size of hundreds of microns containingultrafine sub-grains are developed. The deformed microstructures are detected by transmission electron microscopy, X-raydiffraction and electron backscattered diffraction. High strength and considerable ductility are achieved in the HSRRed alloyand the high strength is ascribed to solution strengthening, grain (sub-grain) strengthening and dislocation strengthening. The grain (sub-grain) strengthening is the dominant contributor (~ 146 ± 6 MPa) for yield strength. The generation of newfine grains is primarily observed along the deformation bands related to the high Mg solid content and the high strain rate at320 °C. The dynamic recrystallization related to the deformation bands is proposed to build the bimodal grain distributionfor achieving high strength and considerable ductility.

Left-Dominant Arrhythmogenic Cardiomyopathy: A Rare and Frequently Misdiagnosed Cardiomyopathy Associated with Heart Failure

Chen Cui,Xinyu Wang,Shihua Zhao 아시아심장혈관영상의학회 2020 Cardiovascular Imaging Asia Vol.4 No.3

A 35-year-old male with 7-year history of exertional dyspnea and abdominal distention had frequent premature ventricular contractions detected by Holter monitoring. Cardiovascular magnetic resonance (CMR) imaging demonstrated a significantly dilated left ventricle (LV) with severely reduced global systolic function. Coronary arterial stenosis was excluded with CT coronary angiography. However, transmural late gadolinium enhancement was detected by CMR in the lateral wall of the LV. The patient received cardiac transplantation. The diagnosis of left dominant arrhythmogenic right ventricular cardiomyopathy was made.

Study on bond behavior of steel reinforced high strength concrete after high temperatures

Chen, Zongping,Zhou, Ji,Wang, Xinyue Techno-Press 2020 Advances in concrete construction Vol.10 No.2

This paper presents experimental results on bond-slip behavior of steel reinforced high-strength concrete (SRHC) after exposure to elevated temperatures. Three parameters were considered in this test: (a) high temperatures (i.e., 20℃, 200℃, 400℃, 600℃, 800℃); (b) concrete strength (i.e., C60, C70, C80); (c) anchorage length (i.e., 250 mm, 400 mm). A total of 17 SRHC specimens subjected to high temperatures were designed for push out test. The load-slip curves at the loading end and free end were obtained, the influence of various variation parameters on the ultimate bond strength and residual bond strength was analyzed, in addition, the influence of elevated temperatures on the invalidation mechanism was researched in details. Test results show that the shapes of load-slip curves at loading ends and free ends are similar. The ultimate bond strength and residual bond strength of SRHC decrease first and then recover partly with the temperature increasing. The bond strength is proportional to the concrete strength, and the bond strength is proportional to the anchoring length when the temperature is low, while the opposite situation occurs when the temperature is high. What's more, the bond damage of specimens with lower temperature develops earlier and faster than the specimens with higher temperature. From these experimental findings, the bond-slip constitutive formula of SRHC subjected to elevated temperatures is proposed, which fills well with test data.

Manufacturing Principle and Meshing Limit Line of Toroidal Surface Enveloping Cylindrical Worm Drive with Arc-Toothed Worm

Xinyue Zhu,Yaping Zhao,Yifei Chi,Gongfa Li,Xinyuan Chen 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.3

The main purpose of this article is to determine the processing parameters of the worm and establish the theory of the meshing limit line of toroidal surface enveloping cylindrical worm drive with the arc-toothed worm. Based on this condition that the instantaneous contact line is a planar curve during grinding the worm blank, it can be deduced that its torsion is equal to zero, then the formulae which determine the installing position of the grinding wheel are acquired. Following this, the equations of the tooth surfaces and the meshing limit function are all obtained. According to the geometric construction and elimination method, the meshing limit points are determined by iteratively solving the corresponding nonlinear equation in its solution domain. In addition, the result of the numerical case demonstrates that the worm helicoid is divided into two parts by the meshing limit line, which makes the working length of the worm cannot reach half of its total thread length. And by adjusting the design parameters of the worm pair and the processing parameters of the worm, the meshing limit line cannot be eliminated and its position on the surfaces of the worm and the worm gear has no notable change.

Evolution of plant Ash1 SET genes: structural divergence and functional differentiation

Xinyu Zhu,Baohua Wang,Xianzhao Kan,Caoyi Chen,Chunmei Yu 한국유전학회 2013 Genes & Genomics Vol.35 No.4

Plant Ash1 SET proteins are involved in H3K36methylation, and play a key role in plant reproductive development. Genes encoding Ash1 SET proteins constitute a multigene family in which the copy number varies among plant species and functional divergence appears to have occurred repeatedly. To investigate the evolutionary history and functional differentiation of the Ash1 SET gene family,we made a comprehensive evolutionary analysis of this gene family from eleven major representatives of green plants. A novel deep sister relationship grouping previously resolved II-1 and II-2 orthologous groups was identified. The absence of AWS domain in the group II-2 suggests that the independent losses of AWS domain have occurred during evolution. A diversity of gene structures in plant Ash1 SET gene family have been presented since the divergence of Physcomitrella patens (moss) from the other land plants. A small proportion of codons in SET domain regions were detected to be under positive selection along the branches ancestral to land plant and angiosperms, which may have allowed changes of substrate specificity among different evolutionary groups while maintaining the primary function of SET domains. Our predictive subcellular localization and comparative anatomical meta-expression analyses can assort with the structural divergences of Ash1SET proteins.

Experimental Studies on Scramjet Tested in a Freejet Facility

Xinyu Chang,Lihong Chen,Hongbin Gu,Gong Yu 한국추진공학회 2004 한국추진공학회 학술대회논문집 Vol.2004 No.5