Preparation of Porous Mullite-Corundum Ceramics Via Organic Foam Impregnation

Xianzhi Zhou,Shaofeng Zhu,Yuxi Wang,TONG ZHANG 한국재료학회 2022 한국재료학회지 Vol.32 No.2

Porous mullite-corundum ceramics were prepared using organic foam impregnation method with alumina and silica as raw materials. The influence of alkaline treatment and surfactant modification on polyurethane foam were studied. Effects of sintering process and material composition on porous mullite-corundum ceramics were investigated. The results show that the hang-pulp quantity of polyurethane foam increases with alkaline treatment. After treatment with 3 wt% SDS solution, the hang-pulp quantity of polyurethane foam further improved. Open porosity of sample decreased with elevation of sintering temperature and holding time, and compressive strength of sample showed a trend opposite to the change of porosity. The open porosity of the sample was enhanced by the increase of m(Al2O3/SiO2); the compressive strength decreased with increase of m(Al2O3/SiO2). However, when m(Al2O3/SiO2) was 2.5, the compressive strength of the sample reached 6.23 MPa, and the open porosity of the sample was 80.7 %.

Modelling and Fabrication of Vibration Energy Harvester Employing Multiple Magnetostrictive/Piezoelectric Composite Transducers

Xianzhi Dai,Yumei Wen,Ping Li,Jin Yang,Ming Li 한국자기학회 2010 한국자기학회 학술연구발표회 논문개요집 Vol.2010 No.12

Use of Biolog to discriminate rhizosphere soil microbial communities of 4-and 9-year Alfalfa (Medicago saliva) stands

Xianzhi Wang,Yuying Shen 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08

Biolog ECO plates (31 different carbon sources, Biolog Inc., Hayward, USA) were used to discriminate between rhizosphere soil samples from 4- and 9-year alfalfa stands each with three replication. The growth curves for different groups of carbon sources were nearly sigmoidal, but the maximum rate of utilization was faster for amino acids, carbohydrates and polymers t㏊n for amides, miscellaneous and carboxylic acids, and carbon sources utilization efficiency were all higher in 9-year t㏊n in 4-year alfalfa stand.

Translation of Chinese Serial Verb Construction

CUI XIANZHI 한국외국어대학교 통번역연구소 2019 한국외국어대학교 통번역연구소 학술대회 Vol.2019 No.07

한·중 명사화 대응 표현 연구

최현식 ( Cui Xianzhi ),김충실 ( Jin Zhongshi ) 한국중국언어학회 2023 중국언어연구 Vol.- No.106

For a long time, the comparative study of Chinese and Korean nominalization has been mainly carried out as a part of translation research or foreign language education research. Therefore, the previous research on Chinese nominalization is relatively weak, and the investigation of related phenomena is not in~depth. If the purpose of education is to improve thinking ability and explore the essence of language, a systematic study of language should be made before exploring the second language teaching method. According to the facts above, this paper pointed out the universality of nominalization from the perspective of language typology, and classified the nominalization phenomena of Chinese and Korean with reference to relevant researches from the cross~language perspective. In the Chinese part, based on grammatical features, the research objects were divided into monosyllabic verbs, disyllabic verbs, adjectives and nominalized clauses in the position of subject and object. In the Korean part, firstly, based on lexical features, the research objects were divided into Sino~Korean verbs and Korean native verbs. Secondly, based on grammatical features, the research objects were divided into intransitive verbs, transitive verbs and nominalized clauses. Then, this paper made a two~way investigation into the existing nominalization researches made by Chinese and Korean academia. On this basis, starting from the controversial points of Korean and Chinese nominalization, this paper studied and compared the characteristics of Korean and Chinese nominalization, and found the answers to the questions raised in the paper. First, with regard to the “nominalization” proposed in the previous researches, this paper pointed out that Chinese disyllabic verbs correspond to Sino~Korean words, and Chinese monosyllabic verbs correspond to Korean native words. Disyllabic verbs and adjectives can be modified by adnominal phrases, so they have the characteristics of nouns. Monosyllabic verbs can be modified by adverbs, so they have the characteristics of verbs. Some studies hold the opinion that Chinese and Korean nominal clauses have the characteristics of verbs. This paper proved the validity of this opinion through the phenomenon that they can be modified by adverbs. The semantic differences between Korean nominalization marker “~ eum” and “~ gi” are also reflected in Chinese. Second, there is no nominalization in monosyllabic verb itself. The phenomenon is caused by the omission of some components when deep structures are expressed by surface structures.

Asynchronous Switching Control of Discrete-time Linear System Based on Mode-dependent Average Dwell Time

Jinjie Huang,Xianzhi Hao,Xiaozhen Pan 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.7

In this paper, we investigate the problem of asynchronous switching control for discrete-time linear systems with mode-dependent average dwell time (MDADT) switching and take the time elay constraints of mode-dependent controllers into consideration. In practical, owing to signal transmission, system detection, and the like, switching of controllers is often lagged behind their corresponding subsystems. Therefore, we divide the time interval of a subsystem operating into two parts: the controller-matched and the controller-mismatched. First, the controller of each subsystem is designed according to its mode-dependent parameters. Then, considering the lag time of controllers, the appropriate MDADT is derived based on Lyapunov stability conditions, and the global exponential stability of the asynchronous switched systems is guaranteed. Finally, a numerical example is provided to demonstrate the potential effectiveness of the proposed method.

Pseudolaric Acid B Inhibits Proliferation, Invasion and Epithelial-to-Mesenchymal Transition in Human Pancreatic Cancer Cell

Xiaoyu Li,Xianzhi Zhao,Wen Song,Zibin Tian,Lin Yang,Qinghui Niu,Qi Zhang,Man Xie,Bin Zhou,Yonghong Xu,Jun Wu,Cuiping Zhang 연세대학교의과대학 2018 Yonsei medical journal Vol.59 No.1

Purpose: This study was aimed to investigate the effect of pseudolaric acid B (PAB) on proliferation, invasion and epithelial-to-mesenchymal transition (EMT) in pancreatic cancer cells and to explore the possible mechanism. Materials and Methods: The pancreatic cancer cell line SW1990 was cultured and treated with PAB dose- and time-dependent manners. Cell proliferation and invasion ability were measured by MTT assay and Matrigel/Transwell test, respectively. Semi-quantitative real-time polymerase chain reaction and Western blotting were conducted to detect the expression of EMT markers and the key molecules. Finally, nude mice subcutaneous transplantation tumor model was used to confirm the therapy efficacy of PAB. Results: PAB could inhibit SW1990 cell proliferation and invasion in time- and dose-dependent manners. Vimentin, fibronectin, N-cadherin, Snail, Slug, YAP, TEAD1, and Survivin were down-regulated (p<0.01), while E-cadherin, caspase-9, MST1, and pYAP were up-regulated (p<0.05). Combined PAB and gemcitabine treatment markedly restricted the tumor growth compared with gencitabin or PAB alone groups. Conclusion: PAB could inhibit the proliferation and invasion ability of pancreatic cancer cells through activating Hippo-YAP pathway and inhibiting the process of EMT.

Origin of dolomitization in the Lower Cretaceous Bayanhua Group dolomitized rocks, Bayindulan Sag, Erlian Basin

Fugui He,Xianzhi Gao,Xianzheng Zhao,Huilai Wang,Dexiang Yang,Quan Wang 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.4

The Bayindulan Sag situated in Erlian Basin, northeast China, is characterized by pervasive dolomitization in Upper A4 Member to Lower T1 Member of Bayanhua Group. These stratum in the Lower Cretaceous Bayanhua Group were deposited in a lacustrine environments. The main objective of this study is to identify the origin of dolomitization and distribution model of dolomitized rocks. Based on petrographic examination, mud-crystal dolomites (<0.03 mm), silt-crystal dolomites (0.03–0.1 mm) and fine-crystal dolomites (0.1– 0.25 mm) have been observed, and the former two types were predominant. Meanwhile, only one type of dolomite have been defined: replacive dolomite. A variety of dolomite textures have also been observed, the major ones of them are scattered, blocky, joined and annular textures. These dolomites have strongly depleted oxygen isotopic values from –17.48‰ to –6.96‰ with the average of –10.48‰ (PDB), carbon isotopic values from 0.24‰ to 8.37‰ with the average of 5.39‰ (PDB). The obvious depletion of oxygen isotopic was presented as a result of the increase in temperature with progressive burial, and the high carbon isotopic content of dolomites maybe result from the involvement of CO2 in the dolomitization process. These CO2 were generated by bio-methanation which commonly took place in moderately deep burial environments. The Sr values from 62.4 ppm to 262 ppm as well as the Sr/Ba ratios from 0.24 to 0.76 in Tengyi Formation mudstones indicate the freshwater lacustrine sedimentary environments. Taking the petrographic and geochemical data into consideration, the conclusion that the dolomites have formed in a freshwater environments during deep burial depths at temperatures of at least 60 °C can be drawn. Petrographic observations and mineralogy analyses indicate that dolomitization is closely associated with tuffaceous materials, the Mg needed for the dolomitization is provided by dissolution of tuffaceous materials and dolomitization is most probably driven by tuffaceous materials alteration at elevated temperatures.

Event-triggered Networked H∞ Output Tracking Control Based on Dynamic Compensation Controller

Jinjie Huang,Xiaozhen Pan,Xianzhi Hao 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.10

In this paper, the event-triggered H∞ output tracking problem is investigated for networked control systems. In order to reduce the output tracking error as well as to improve network resource utilization, we propose anidea of dynamic compensation controller with the discrete-time event-triggered mechanism, that is, the integral termof tracking error and the state of the reference system are introduced to form states of the augmented system. We firstexamine the dynamic compensation idea by the H∞ output tracking control problem for linear time-invariant (LTI)systems. Then, we model the closed-loop event-triggered networked control system as a time-delay augmented linear system. By constructing a Lyapunov-Krasovskii functional with the delay fractioning technique, the stabilityconditions with lower conservatism are derived in the form of the linear matrix inequalities (LMIs). Furthermore,a method is proposed to design the H∞ dynamic compensation controllers and the discrete-time event-triggeredmechanisms. Finally, the satellite tracking control problem is used as an example to show that the dynamical compensation idea is effective in reducing the tracking error and that the proposed method in this paper can achievebetter performance than that in the existing literature

Responses of Antioxidant Enzyme Activity to Different Fertilizer and Soil Moisture Conditions in Relation to Cold Resistance in Zanthoxylum armatum

Jiangtao Fan,Jingyan Wang,Xianzhi Liu,Changping Zhao,Chaobing Zhou,Tasheen Saba,Jiaojiao Wu,Wenkai Hui,Wei Gong 한국원예학회 2022 원예과학기술지 Vol.40 No.3

Zanthoxylum armatum, known as green prickly ash, is a major condiment species planted on a large scale in southwest China. However, its limited cold tolerance has been a significant disadvantage for its cultivation in low-temperature regions. To better understand the antioxidant enzyme activities related to cold resistance, superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) activities as well as malondialdehyde (MDA) content were investigated under 16 fertilizer and soil moisture treatments to explore the cold resistance response mechanism in Z. armatum. The results showed that low temperatures could significantly affect antioxidant enzyme activities in the leaves of Z. armatum seedlings. The antioxidant enzyme activities of seedlings treated with soil moisture and fertilizer treatments were significantly higher than those without fertilizer. Furthermore, the comprehensive evaluation index (CEI) was positively correlated with SOD, POD, and CAT activities but negatively correlated with MDA content. Meanwhile, the treatment T12 (60% field water capacity + 300 kg·ha-1 nitrogen + 30 kg·ha-1 phosphoric anhydride) had the highest CEI value, whereas T1 (20% water capacity) had the lowest. Based on the regression equation for CEI improvement, the predicted optimal levels for field water capacity (FWC), nitrogen, phosphorus, and potassium were 59.6%–63.4% FWC (average 61.5%), 114.2–248.8 kg N/ha (average 181.5 kg N/ha), 40.1–108.5 kg P2O5/ha (average 74.3 kg P2O5/ha), and 200.2–254.4 kg K2O/ha (average 227.3 kg K2O/ha), respectively. The present study provides the optimal soil moisture and fertilizer concentration required to enhance protective enzyme activity and low-temperature tolerance, which is crucial for improving cold resistance in Z. armatum.