Investigation of a Widely Applicable Process for Extracting Carboxyl-rich Cellulose Nanocrystal (CNC)

Shuai Jiang,Amjad Farooq,Fuyi Han,Lifang Liu 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3

Herein, carboxyl-rich cellulose nanocrystals (CNC) were obtained through a designed TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) mediated oxidation process without any subsequent mechanical treatment, which was provedto be widely suitable for commonly used cellulosic sources, including fibril-like fibers and lignocellulose biomasses. CNCprepared from the acid-free process showed better dispersion stability, less aggregation, higher aqueous UV transmittanceand crystallinity compared with that from sulfuric acid hydrolysis process. Furthermore, the residuals in the insolubleprecipitate were further conducted ultrasonic treatment and extra CNC was obtained from the oxidized cotton and ramiecellulose while cellulose nanofibril (CNF) was extracted from rice straw and pine powder, attributing to their different nativestructures. The total yields of nanocelluloses (NCs) were up to 63.2-68.3 %, improving the utilization ratio of the rawmaterials. This work provided a widely applicable acid- and mechanic-free route in fabricating CNC with inherent carboxylgroups and described an understanding of the relationship between the native structure of raw materials and their products,which is beneficial for improving the application of NCs.

Numerical simulation on mining effect influenced by a normal fault and its induced effect on rock burst

Jiang, Jin-Quan,Wang, Pu,Jiang, Li-Shuai,Zheng, Peng-Qiang,Feng, Fan Techno-Press 2018 Geomechanics & engineering Vol.14 No.4

The study of the mining effect influenced by a normal fault has great significance concerning the prediction and prevention of fault rock burst. According to the occurrence condition of a normal fault, the stress evolution of the working face and fault plane, the movement characteristics of overlying strata, and the law of fault slipping when the working face advances from footwall to hanging wall are studied utilizing UDEC numerical simulation. Then the inducing-mechanism of fault rock burst is revealed. Results show that in pre-mining, the in situ stress distribution of two fault walls in the fault-affected zone is notably different. When the working face mines in the footwall, the abutment stress distributes in a "double peak" pattern. The ratio of shear stress to normal stress and the fault slipping have the obvious spatial and temporal characteristics because they vary gradually from the higher layer to the lower one orderly. The variation of roof subsidence is in S-shape which includes slow deformation, violent slipping, deformation induced by the hanging wall strata rotation, and movement stability. The simulation results are verified via several engineering cases of fault rock burst. Moreover, it can provide a reference for prevention and control of rock burst in a fault-affected zone under similar conditions.

Improvement of the Spectral Reconstruction Process with Pretreatment of Matrix in Convex Optimization

Zheng-shuai Jiang,Xin-yang Zhao,WEI HUANG,Tao Yang 한국광학회 2021 Current Optics and Photonics Vol.5 No.3

In this paper, a pretreatment method for a matrix in convex optimization is proposed to optimize the spectral reconstruction process of a disordered dispersion spectrometer. Unlike the reconstruction process of traditional spectrometers using Fourier transforms, the reconstruction process of disordered dispersion spectrometers involves solving a large-scale matrix equation. However, since the matrices in the matrix equation are obtained through measurement, they contain uncertainties due to out of band signals, background noise, rounding errors, temperature variations and so on. It is difficult to solve such a matrix equation by using ordinary nonstationary iterative methods, owing to instability problems. Although the smoothing Tikhonov regularization approach has the ability to approximatively solve the matrix equation and reconstruct most simple spectral shapes, it still suffers the limitations of reconstructing complex and irregular spectral shapes that are commonly used to distinguish different elements of detected targets with mixed substances by characteristic spectral peaks. Therefore, we propose a special pretreatment method for a matrix in convex optimization, which has been proved to be useful for reducing the condition number of matrices in the equation. In comparison with the reconstructed spectra gotten by the previous ordinary iterative method, the spectra obtained by the pretreatment method show obvious accuracy.

중국의 초급 한국어 교재의 상대높임법 연구

강수 ( Jiang Shuai ) 한국언어문화학회(구 한양어문학회) 2018 한국언어문화 Vol.0 No.66

본고는 중국 현지 대학에서 한국어 전공 교재로 많이 사용되고 있는 대표적인 한국어 초급 교재 3종을 선정하여, 한국어 초급 교재에서의 상대높임법에 대한 제시 순서와 기술 내용을 분석하였다. 분석 결과, 교재들이 선호하는 화계, 격식체와 비격식체의 구분, ‘-아요/어요’ 등과 관련하여 교재마다 설명이 다름에도 불구하고 문제점을 가지고 있었다. 또한 ‘반말체’ ‘-다’와 관련해서도 내용 기술에 있어 큰 문제가 있어 보였다. 교재들을 살펴보면 상대높임법에 대한 내용 기술의 일관성을 찾아 볼 수 없다. 또한 화계 간의 경계와 차이를 문법 설명만으로는 명확히 할 수 없다는 점이 명백히 드러났다. 이런 문제점을 개선하기 위해 문법 교육이 학습자의 흥미를 불러일으킬 수 있도록 하려면 보고에서 언어적 설명뿐만 아니라 사회적 맥락, 담화 장르 측면에서의 접근 방법을 제시하였다. 향후 이러한 문제를 고려하여 한국어 교재를 개발할 때 조금이나마 도움이 되었으면 한다. In this paper, study on korean addressee honorifics of three representative Korean beginner textbooks, which are widely used in the department of Korean language major in China. We analyzed the presentation order and description contents of addressee honorifics in Korean beginner textbooks. As a result of the analysis of speech level, polite formal style, polite informal style, and about ‘-아/어요’, ‘-다’, there has different explanation in each textbooks. and there seems to be a problem. As we look at these textbooks, we can not find consistency in the content description of addressee honorifics. It is also clear that the grammatical explanation about a little bit distinction between speech level’s boundary is not sufficient. grammar education is in order to improve students’ interest, Helping to learn Korean more interesting and easier, Therefore, On the korean addressee honorific Education it is necessary to consider educational approach in terms of linguistic context, contextual context as well as socio-cultural context.

중국 소비자의 미리 포장된 식사 구매 의도에 대한 이론적 기반 및 실증적 검증: 소비자 혁신성 관점에서 확장된 TPB 모델

Hao-Jie Jiang,Chi Gong,Shuai Jiang 사회혁신기업연구원 2024 혁신기업연구 Vol.9 No.1

COVID-19 팬데믹의 영향으로 중국의 미리 포장된 식사 산업이 빠른 성장 단계에 진입하여 소비자들로부터 점점 더 많은 호감을 얻고 있습니다. 이 연구는 중국 소비자들이 미리 포장된 식사를 구매하는 데 영향을 미치는 요인을 탐색하는 것을 목표로 합니다. 우리는 계획된 행동 이론(TPB)과 소비자 혁신성을 사용하여 구조방정식 모델을 구축했습니다. 이 정량적 연구는 비확률 샘플링 온라인 설문조사를 통해 293개의 유효 데이터 포인트를 수집하고 SPSS 27.0 및 AMOS 26.0을 사용하여 모델 검증을 수행했습니다. 결과는 소비자의 도구적 및 정서적 태도가 구매 의도에 중요하게 긍정적인 영향을 미친다는 것을 보여줍니다. 서술적 규범도 구매 의도에 중요한 긍정적인 영향을 미칩니다, 반면 지시적 규범은 중요한 영향을 보이지 않습니다. 소비자의 자기 통제력과 외부 조건은 모두 구매 의도와 행동에 중요한 긍정적인 영향을 미칩니다. 구매 의도는 구매 행동에 중요한 영향을 미치며 자기 통제력과 외부 조건에서의 매개 효과를 가집니다. 소비자 혁신성은 구매 의도와 행동 사이에서 중요한 조절 역할을 합니다. 제품 디자인과 홍보를 강화하기 위해 소비자들에게 매력을 높이는 것이 필수적입니다. 추가 연구를 위한 제안이 제시됩니다. Owing to the impact of the COVID-19 pandemic, the pre-made food industry in China has entered a rapid growth phase, gaining increasing favor from consumers. This study aims to explore the factors influencing Chinese consumers' purchase of pre-made food. We employed the Theory of Planned Behavior (TPB) and consumer innovativeness to construct a structural equation model. This quantitative study gathered 293 valid data points through non-probability sampling online surveys and employed SPSS 27.0 and AMOS 26.0 for model validation. Results reveal that consumers' instrumental and affective attitudes significantly positively influence purchase intention. Descriptive norms also exert a significant positive impact on purchase intention, while injunctive norms do not show a significant effect. Consumers' self-control and external conditions both have significant positive influences on purchase intention and behavior. Purchase intention significantly affects purchase behavior and mediates effects in self-control and external conditions. Consumer innovativeness plays a significant moderating role between purchase intention and behavior. To enhance product design and promotion, it is imperative to increase attractiveness to consumers. Suggestions for further research are presented.

Predictors and Dynamic Nomogram to Determine the Individual Risk of Malignant Brain Edema After Endovascular Thrombectomy in Acute Ischemic Stroke

Qian-mei Jiang,Shuai Yu,Xiaofeng Dong,Huai-shun Wang,Jie Hou,Zhi-chao Huang,Zhi-liang Guo,Shou-jiang You,Guo-dong Xiao 대한신경과학회 2022 Journal of Clinical Neurology Vol.18 No.3

Background and Purpose This study aimed to construct an optimal dynamic nomogram for predicting malignant brain edema (MBE) in acute ischemic stroke (AIS) patients after endovascular thrombectomy (ET). Methods We enrolled AIS patients after ET from May 2017 to April 2021. MBE was defined as a midline shift of >5 mm at the septum pellucidum or pineal gland based on follow-up computed tomography within 5 days after ET. Multivariate logistic regression and LASSO (least absolute shrinkage and selection operator) regression were used to construct the nomogram. The area under the receiver operating characteristic curve (AUC) and decisioncurve analysis were used to compare our nomogram with two previous risk models for predicting brain edema after ET. Results MBE developed in 72 (21.9%) of the 329 eligible patients. Our dynamic web-based nomogram (https://successful.shinyapps.io/DynNomapp/) consisted of five parameters: basal cistern effacement, postoperative National Institutes of Health Stroke Scale (NIHSS) score, brain atrophy, hypoattenuation area, and stroke etiology. The nomogram showed good discrimination ability, with a C-index (Harrell’s concordance index) of 0.925 (95% confidence interval=0.890–0.961), and good calibration (Hosmer-Lemeshow test, p=0.386). All variables had variance inflation factors of <1.5 and tolerances of >0.7, suggesting no significant collinearity among them. The AUC of our nomogram (0.925) was superior to those of Xiang-liang Chen and colleagues (0.843) and Ming-yang Du and colleagues (0.728). Conclusions Our web-based dynamic nomogram reliably predicted the risk of MBE in AIS patients after ET, and hence is worthy of further evaluation.

Design and Analysis of Fast Image Encryption Algorithm based on Multiple Chaotic Systems in Real-time Security Car

Shuai Wang,Wei Sun,Yinan Guo,Haiqun Yang,Shuming Jiang 보안공학연구지원센터 2013 International Journal of Security and Its Applicat Vol.7 No.6

Rotor ground-fault diagnosis methods for synchronous condensers based on amplitude and phase-angle of voltage

Jiang, Mengyao,Ma, Hongzhong,Zhao, Shuai,Tang, Xiaozheng,Liu, Yidan The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.5

A single ground fault of the rotor windings in a synchronous condenser can cause serious damage if the fault is not eliminated in time. This paper proposes a new rotor ground-fault diagnosis method for synchronous condensers based on the amplitude of the 150 Hz component of the voltage across a grounding resistance (GR) placed in the neutral of an excitation transformer. It can be seen that the amplitude of the 150 Hz component of the voltage across the GR increases with a decrease of the ground-fault resistance (GFR). This method is an improvement of existing algorithms for rotor ground-fault detection that requires less analyzing and can achieve online detection of the severity of a rotor ground fault at any point of the excitation winding. In addition, the influence of different excitation voltages on the algorithm based on phase-angle is analyzed considering actual working characteristics. Moreover, a model is built in the MATLAB/Simulink platform using the real parameters of a TTS-300-2 synchronous condenser to verify the effectiveness of the proposed method. Finally, a dual diagnostic criterion is given according to the results of simulations. The research conclusions can have a great significance on the healthy running of synchronous condensers and they can help to drastically reduce both cost and repair time.

Highly-Efficient Graphene Pressure Sensor with Hierarchical Alarm for Detecting the Transient Internal Pressure of Transformer Bushing

Jiang Tianyan,Zhang Tao,Li Yang,Zeng Shuai,Liu Qiang,Bi Maoqiang 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4

The safe operation of power transformer is vital to the reliability of modern power network. The bushing is a key component of transformer that serves to connect the transformer windings to the transmission lines. Due to its intricate structure and severe operating conditions, the bushing is among the most frequent cause of transformer failure. Therefore, it is essential to monitor the condition of transformer bushing for maintaining the safe and stable operation of grid. In this paper, we propose a graphene piezoresistive pressure sensor based on handkerchief paper (GHPPS) to monitor the internal pressure of transformer bushing. The GHPPS possesses a highly porous structure and a fibrous tissue, and exhibits a superb sensitivity to the variations of bushing internal pressure. Moreover, we compared the sensitivity and conductivity of the sensors with different paper layers. The GHPPS with 8 layers owns the highest sensitivity (15.6 kPa−1), the smallest response time (60 ms) and recovery time (75 ms), and the best stability. In addition, a hierarchical alarm device is used to test the monitoring capability of GHPPS at different pressure levels. The results prove that the GHPPS is a promising tool for monitoring bushing conditions.

Synthesis and Characterization of Doxorubicin Loaded pH-Sensitive Magnetic Core–Shell Nanocomposites for Targeted Drug Delivery Applications

Wei Jiang,Juan Wu,Yewen Shen,Renbing Tian,Shuai Zhou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.11

In order to improve the effects of medical therapy for cancer, we prepared magnetic nanocomposites (Fe3O4@SiO2–NH–NH2) as doxorubicin (DOX) carriers via two different schemes. Scheme (I): the carriers were synthesized from magnetic silica nanoparticles (Fe3O4@SiO2) via layer by layer modification, scheme (II): the carriers were obtained from amino-modified magnetic silica nanoparticles (Fe3O4@SiO2–NH2) synthesized by one-step, and followed by surface modification. In order to load DOX effectively, the surface of the carriers were further modified to make the surface with a large number of hydrazine bonds which can form a pH-sensitive bond (hydrazone bond) with DOX. The two kinds of carriers both exhibited a size around 80 nm, high stability and superparamagnetic behavior. However, DOX-loaded carriers (Fe3O4@SiO2–DOX (2)) performed relatively poorer performance in terms of drug loading and releasing (the loading efficiency of DOX decreased from 67.33% to 42.15%, while the releasing efficiency of DOX decreased from 66.16% to 62.23% within 72 h at pH 4.0). Water-soluble tetrazolium salts (WST-1) assays in cancer cells (Hela) demonstrated that the Fe3O4@SiO2–DOX presented high anti-tumor activity, while the carriers were nearly nontoxic. Thus, the results suggested that the magnetic nanocomposites synthesized by the two different methods both can be employed to deliver DOX, while the carriers obtained via the first method may perform better and would be applied in the field of cancer therapy in the future.