Study on the internal irreversible losses and process exponent of single screw expanders

Lili Shen,Yuting Wu,Wei Wang,Biao Lei,Wei Duan,Ruiping Zhi 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.3

The irreversible losses including intake pressure, leakage, heat transfer, friction and over-expansion losses have great influence on the expander performance. In this paper, a thermodynamic model is presented to predict the real expansion process exponent and analyze the under-expansion or over-expansion under designed and off-designed operation conditions. The model verified by experimental results has a good agreement. Results showed that the real expansion process exponent of air is higher than the ideal adiabatic index of 1.4 and decreases from 1.716 to 1.644 with the internal volume ratio changing from 1.8 to 6.5. The real expansion process exponent of R123 is close to 1.00 under different internal volume ratio. Compared to the intake pressure, the variation of back pressure has greater influence on the large internal volume ratio than the small one. Thus, to adjust the back pressure is more effective to match the designed condition for the expander with a large internal volume ratio.

Insect-resistant Mechanism of Recombinant Baculovirus AcMNPVPK2- EGFP against Spodoptera exigua Larvae

Lili Wei,Chenggang Xu,Ai-Hua Liang,Yuejun Fu 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.4

Autographa californica multicapsid nucleopolyhedrovirus (AcMNPV) is a kind of potential biological insecticide. Ac-PK2 protein encoded by orf123 in AcMNPV genome can inhibit eIF2α family kinases to increase viral adaptation in vivo. In our previous study, it was found that recombinant AcMNPV-PK2-EGFP showed high virulence and anti-insect activity against Sf9 cells and Spodoptera exigua larvae. In this study, we investigated the function of Ac-PK2 protein in the insecticidal activity of AcMNPV and the anti-insect mechanism. AcMNPV-PK2- EGFP up-regulated the expression of Ac-pk2 gene in midgut and nerve cord in infected Spodoptera exigua larvae, compared with these in wild-type treatment group. Transcriptional level of BmK IT and detoxication related genes in epidermis, midgut and nerve cord was detected by quantitative PCR. Phenoloxidase activity assay showed that the insect’s humoral immunity was affected by AcMNPV-PK2-EGFP in a time-effect relationship. Western blot analysis of P53 protein indicated the apoptotic level in the midgut tissue was higher in AcMNPV-BmK IT and AcMNPV-PK2-EGFP co-infeced Spodoptera exigua larvae than that in other treatment groups at 4 h and 8 h postinfection. These results provided a theoretical basis to study the application of AcMNPV-PK2-EGFP as a biological insecticide.

Hydrothermal Synthesis of SnO2 Nanorod as Anode Materials for Lithium-Ion Battery

Wei Zhang,Lili Feng,Haiyun Chen,Yinyin Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.9

In this study, SnO2 nanorods are successfully prepared by simple template-free hydrothermal method without surfactant. SnO intermediate with lamellar morphology is first formatted by hydrothermal method and SnO2 nanorods are obtained after calcinations. The results of XRD characterization show that lamellar structured SnO intermediate has preferred orientation in 0 0 1 direction. According to supposed mechanism during formation process of SnO2 nanorods, tiny crystal nucleus of Sn(OH)2 and a bit of SnCO3 are generated from SnCl2 and urea. Then the crystal nucleus gather together to form a nanorod. With continued reaction, nanorods gather together to form sheets and the sheets grow up to lamellar morphology and the intermediate decomposes into SnO because of the hydrothermal process. The SnO intermediate convert to SnO2 with sheets breaking to nanorods after calcination. The results of galvanostatic cell cycling show that SnO2 particle has high specific discharge capacity capacity. This experiment of SnO2 nanorod preparation provides us an effective way of easy processing, low cost, and more environmentally synthesis strategy to synthesize SnO2 nanorods.

Development of High-Current Sheet Beam Cathodes for Terahertz Sources

Lili Li,Yiman Wang,Wei Liu,Yanchun Wang,Jinshu Wang,Srivastava, A.,Jin-Kyu So,Gun-Sik Park IEEE 2009 IEEE transactions on electron devices Vol.56 No.5

<P>Generation of a sheet beam directly from a scandia-doped dispenser cathode has been investigated and optimized by means of beam-profile simulations and measurements. Rectangular beams 600 mum wide and 100 mum thick with current densities over 50 A/cm<SUP>2</SUP> have been generated. The beams are stable for at least several hundred hours with the cathodes operating at 950degC<SUB>b</SUB>, making them promising candidates for application in the next generation of terahertz vacuum electron devices such as a 0.5-THz superradiant Smith-Purcell radiation source.</P>

Fucosylated Chondroitin Sulfate from Sea Cucumber Inhibited Islets of Langerhans Apoptosis via Inactivation of the Mitochondrial Pathway in Insulin Resistant Mice

Wei Jiang,Shijie Li,Shiwei Hu,Jignfeng Wang,Wendong Song,Lili Ji,Yaning Wang 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.3

The effects of fucosylated chondroitin sulphate from sea cucumber (CHS) on inhibition of pancreatic islet apoptosis in high-fat high-sucrose diet (HFSD)-induced insulin resistant mice were studied for 19 weeks. CHS treatment significantly (p<0.05) decreased fasting blood glucose, insulin, and tumor necrosis factor (TNF)-α levels, and increased the serum adiponectin level, improved insulin resistance, and repaired HFSD-injured islets of langerhans, compared with controls. CHS supplementation significantly (p<0.05) inhibited pancreas cell apoptosis via reduction of cytochrome c, caspase 9, and caspase 3 mRNA expressions, cytochrome c release into the cytoplasm, and caspase 9 and cleaved-caspase 3 protein expressions, compared with controls. These effects were associated with upregulation of Bcl-2 and Bcl-xL mRNA and protein expressions, and downregulation of Bax and t-Bid mRNA and protein expressions. Combination treatments with CHS and rosiglitazone synergistically protected pancreatic islets. CHS improves insulin resistance and protects islets of langerhans from apoptosis via inactivation of the intrinsic mitochondrial pathway.

Comparison of Aggregation Ways on Soil Property Maps

Wei Shangguan,Yongjiu Dai,Duoying Ji,Hua Yuan,Qian Zhang,Lili Wang 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Genome-wide identification and analysis of expression pattern of REVEILLE transcription factors in castor (Ricinus communis L.)

Wei Xue,Zhang Jixing,Wang Nan,Sun Mengdi,Ding Xue,Xu Hui,Yu Xiumin,Yue Wenran,Huo Hongyan,Yu Lili,Wang Xiaoyu 한국원예학회 2024 Horticulture, Environment, and Biotechnology Vol.65 No.3

REVEILLE (RVEs) transcription factors play an important role in regulating circadian clock, plant growth and development, and stress responses. While RVEs have been identifi ed in various plant species, comprehensive genome exploration and analysis of RVEs in castor ( Ricinus communis L.) have not been previously reported. In this study, we identifi ed RcRVEs in the castor genome through sequence alignment and conducted an analysis encompassing gene structures, protein motifs, physicochemical properties, transcription patterns under cold stress, diff erent tissues, and diurnal rhythm. A total of fi ve RcRVEs were pinpointed in the castor genome. Evolutionary tree analysis categorized these RcRVEs into three distinct groups, implying that diff erent RcRVEs may fulfi ll distinct biological functions. Furthermore, several abiotic stresses and hormone-responsive cis -acting elements were found in the promoters of the RcRVEs . RNA-sequencing (RNA-seq) analysis revealed that RcRVE1 and RcRVE7 were induced by cold stress and exhibited upregulation over time, indicating their involvement in regulating cold adaptation in castor plants. Five RcRVEs have notably higher expression levels in leaves compared to other tissues. The expression of all RcRVEs displayed diurnal rhythms under light/dark cycles. This study provides valuable insights into the potential functions of RcRVEs in regulating castor’s growth and development, and responses to cold stress.

Transparent Lamellar Porous Material and Its Greatly Reduced Dielectric Constant

Lili Liu,Cuijiao Zhao,Yawen Huang,Xiaonan Wei,Hongtao Yu,Junxiao Yang 한국고분자학회 2017 Macromolecular Research Vol.25 No.10

One trend for low dielectric materials is to reach low dielectric constant values at as low porosity as possible. In this work, a lamellar porous material was prepared by spin-coating of poly(vinyl alcohol) (PVA)/manganese dioxide (MnO2) nanosheet composited film, followed by cross-linking of PVA and removing nanosheets. FTIR, XRD and TGA measurement results demonstrate that the templates were almost completely removed. SEM image shows that the etched PVA film has a lamellar porous structure. Dielectric test results indicate that at the porosity of only 17.5%, the dielectric constant of porous PVA is reduced to approximately half that of neat cross-linked PVA. The serial model shows a good consistence with experimental dielectric constant value. This explains well the high efficiency of lamellar porous structure in reducing dielectric constant.

Choline supplementation improves the lipid metabolism of intrauterine-growth-restricted pigs

Li, Wei,Li, Bo,Lv, Jiaqi,Dong, Li,Zhang, Lili,Wang, Tian Asian Australasian Association of Animal Productio 2018 Animal Bioscience Vol.31 No.5

Objective: The objective of this study was to investigate the effects of dietary choline supplementation on hepatic lipid metabolism and gene expression in finishing pigs with intrauterine growth retardation (IUGR). Methods: Using a $2{\times}2$ factorial design, eight normal birth weight (NBW) and eight IUGR weaned pigs were fed either a basal diet (NBW pigs fed a basal diet, NC; IUGR pigs fed a basal diet, IC) or a diet supplemented with two times more choline than the basal diet (NBW pigs fed a high-choline diet, NH; IUGR pigs fed a high-choline diet, IH) until 200 d of age. Results: The results showed that the IUGR pigs had reduced body weight compared with the NBW pigs (p<0.05 from birth to d 120; p = 0.07 from d 120 to 200). Increased (p<0.05) free fatty acid (FFA) and triglyceride levels were observed in the IUGR pigs compared with the NBW pigs. Choline supplementation decreased (p<0.05) the levels of FFAs and triglycerides in the serum of the pigs. The activities of malate dehydrogenase and glucose 6-phosphate dehydrogenase were both increased (p<0.05) in the livers of the IUGR pigs. Choline supplementation decreased (p<0.05) malate dehydrogenase activity in the liver of the pigs. Gene expression of fatty acid synthase (FAS) was higher (p<0.05) in the IC group than in the other groups, and choline supplementation decreased (p<0.05) FAS and acetyl-CoA carboxylase ${\alpha}$ expression in the livers of the IUGR pigs. The expression of carnitine palmitoyl transferase 1A (CPT1A) was lower (p<0.05) in the IC group than in the other groups, and choline supplementation increased (p<0.05) the expression of CPT1A in the liver of the IUGR pigs and decreased (p<0.01) the expression of hormone-sensitive lipase in both types of pigs. The gene expression of phosphatidylethanolamine N-methyltransferase (PEMT) was higher (p<0.05) in the IC group than in the other groups, and choline supplementation significantly reduced (p<0.05) PEMT expression in the liver of the IUGR pigs. Conclusion: In conclusion, the lipid metabolism was abnormal in IUGR pigs, but the IUGR pigs consuming twice the normal level of choline had improved circulating lipid parameters, which could be related to the decreased activity of nicotinamide adenine dinucleotide phosphate-generating enzymes or the altered expressions of lipid metabolism-related genes.

Modularized bioceramic scaffold/hydrogel membrane hierarchical architecture beneficial for periodontal tissue regeneration in dogs

Yingming Wei,Zhongxiu Wang,Jiayin Han,Xiaojian Jiang,Lihong Lei,Xianyan Yang,Weilian Sun,Zhongru Gou,Lili Chen 한국생체재료학회 2022 생체재료학회지 Vol.26 No.4

Background: Destruction of alveolar bone and periodontal ligament due to periodontal disease often requires surgical treatment to reconstruct the biological construction and functions of periodontium. Despite significant advances in dental implants in the past two decades, it remains a major challenge to adapt bone grafts and barrier membrane in surgery due to the complicated anatomy of tooth and defect contours. Herein, we developed a novel biphasic hierarchical architecture with modularized functions and shape based on alveolar bone anatomy to achieve the ideal outcomes. Methods: The integrated hierarchical architecture comprising of nonstoichiometric wollastonite (nCSi) scaffolds and gelatin methacrylate/silanized hydroxypropyl methylcellulose (GelMA/Si-HPMC) hydrogel membrane was fabricated by digital light processing (DLP) and photo-crosslinked hydrogel injection technique respectively. The rheological parameters, mechanical properties and degradation rates of composite hydrogels were investigated. L-929 cells were cultured on the hydrogel samples to evaluate biocompatibility and cell barrier effect. Cell scratch assay, alkaline phosphatase (ALP) staining, and alizarin red (AR) staining were used to reveal the migration and osteogenic ability of hydrogel membrane based on mouse mandible-derived osteoblasts (MOBs). Subsequently, a critical-size one-wall periodontal defect model in dogs was prepared to evaluate the periodontal tissue reconstruction potential of the biphasic hierarchical architecture. Results: The personalized hydrogel membrane integrating tightly with the nCSi scaffolds exhibited favorable cell viability and osteogenic ability in vitro, while the scratch assay showed that osteoblast migration was drastically correlated with Si-HPMC content in the composite hydrogel. The equivalent composite hydrogel has proven good physiochemical properties, and its membrane exhibited potent occlusive effect in vivo; meanwhile, the hierarchical architectures exerted a strong periodontal regeneration capability in the periodontal intrabony defect models of dogs. Histological examination showed effective bone and periodontal ligament regeneration in the biomimetic architecture system; however, soft tissue invasion was observed in the control group. Conclusions: Our results suggested that such modularized hierarchical architectures have excellent potential as a next-generation oral implants, and this precisely tuned guided tissue regeneration route offer an opportunity for improving periodontal damage reconstruction and reducing operation sensitivity.