Terahertz Spectral Characteristics of Electrolyte Solutions under Different Magnetic Fields

Siyu Shao,Haiyun Huang,Bo Peng,Guoyang Wang,Ping Ye,Jiahui Wang,Bo Su,Hailin Cui,Cunlin Zhang 한국광학회 2022 Current Optics and Photonics Vol.6 No.3

Microfluidic chips are new devices that can manipulate liquids at the micrometer level, and terahertz (THz) time-domain spectroscopy has good applicability in biochemical detection. The combination of these two technologies can shorten the distance between sample and THz wave, reduce THz wave absorption by water, and more effectively analyze the kinetics of biochemical reactions in aqueous solutions. This study investigates the effects of different external magnetic field intensities on the THz transmission characteristics of deionized water, CuSO 4 , CuCl 2 , (CH 3 COO) 2 Cu, Na 2 SO 4 , NaCl, and CH 3 COONa; the THz spectral intensity of the sample solutions decrease with increasing intensity of the applied magnetic field. Analysis shows that the magnetic field leads to a change in the dipole moment of water molecules in water and electrolyte solutions, which enhances not only the hydrogen-bond networking ability of water but also the hydration around ions in electrolyte solutions, increasing the number of hydrogen bonds. Increasing the intensity of this magnetic field further promotes the hydrogen-bond association between water molecules, weakening the THz transmission intensity of the solution.

A Study of Korean Neologism Evolved from Four-Character Idioms: From the Perspective of Analogical Formation and Word Recognition

Siyu Wang 한국언어학회 2023 언어 Vol.48 No.4

In Korean neologisms, there are some words evolved from four-character idioms, such as “ko-ko-ik-sen(高高益善)” and “chen-ko-a-pi(天高我肥)”. In this paper, first, the formation of these words and their similarity were studied from the perspective of analogy. Then, the word recognition of Chinese Korean learners was examined through experiments, and the connection between recognition and analogy was focused on. In previous studies on the formation of new words, discussions have generally focused on compound words and derivative words. Paying attention to these neologisms is meaningful to analyze not only word formation but also the relatedness between word formation and recognition. Moreover, this research will serve a reference material in the field of linguistics and vocabulary education.

한국어 조사·어미 결합형 식물 명칭의 형성 연구

왕사우(Wang Siyu) 형태론 2021 형태론 Vol.23 No.2

그동안 명사의 형성을 다루어 온 논의들은 그 대상이 주로 합성어와 파생어에만 집중되어 있었다. 그러나 단순히 합성과 파생만으로는 설명할 수 없는, 통사적인 요소인 조사나 어미가 단어 형성에 참여하는 경우도 적지 않다. 흥미로운 것은 그중에 식물 명칭이 많다는 것이다. 단어 형성의 측면에서는 일반적인 단어뿐만 아니라 식물 명칭도 단어 형성에 의미 있는 자료가 될 수 있다. 이에 본고에서는 조사·어미 결합형 식물 명칭에 주목하여 논의하였다. 조사·어미 결합형 식물 명칭은 주로 관형격 조사 ‘의’ 결합형 식물 명칭, 보조사 ‘도’ 결합형 식물 명칭, 관형사형 어미 ‘-(으)ㄴ’ 결합형 식물 명칭의 세 가지로 나눌 수 있다. 본고에서는 이 세 가지 유형의 양상을 살펴본 다음 이들의 형성과 공시적 단어화를 논의하였다. 이들 단어는 명명의 욕구에 의해 구의 공시적 단어화 과정을 거쳐서 형성된 것이다. 또한, 단어 형성 기제로서의 유추도 조사·어미 결합형 식물 명칭의 형성에 주요한 역할을 담당한다. 이 논문은 유추를 크게 표면적 유추와 유추의 틀로 분류함에 기반하여 논의를 전개하였다. 조사·어미 결합형 식물 명칭을 유추로 설명할 수 있을뿐더러 그 정도가 유사성에 따라 차이가 난다고 할 수 있다. 즉 유추의 틀로 분석하여 “‘나도/너도’류 > ‘가는’류 > ‘닭의’류”로 유추의 정도가 차이 나는 것으로 나타났다. 이러한 점을 고려하여 유추에 의한 단어 형성도 경우에 따라 정도 차이가 있을 수 있다. 본고의 논의를 통해서 단어 형성의 측면에서 한국어의 조사·어미 결합형 식물 명칭에 대해 더 깊이 있게 이해할 수 있을 뿐만 아니라 조사·어미 결합형 단어와 관련된 연구에 대해서도 도움이 될 것이다. Josa(the case marker in Korean) and Ending are features of Korean which is an agglutinative language. Josa and Ending are grammatical elements that exist not only in phrases, but also inside words. The discussions dealing with the formation of nouns focused mainly on compound words and derivatives in previous researches. However, there are also considerable situations that Josa or Ending is involved in word formation, which cannot be simply explained by compounding or derivation. In this paper, plant names were focused on, as typical Josa or Ending combined nouns. Josa or Ending combined plant names were divided into “genitive marker ‘ui’ combined plant names”, “auxiliary particle ‘do’ combined plant names” and “adnominal ending ‘-(eu)n’ combined plant names”. The aspects of these three types were examined firstly and then their formations were discussed. These words are formed by the desire for naming, and are formed through the process of synchronical wordization of phrases. In addition, analogy as a mechanism for word formation also plays a major role in the formation of Josa or Ending combined plant names. In this paper, the discussion was developed based on the classification of analogies into ‘surface analogy’ and ‘analogy with schema’. It can be said that the Josa or Ending combined plant names can be explained by analogy, and what’s more the degree of analogy varies from similarity to similarity. Considering this point, there may be differences by the similarity degree of analogical word formation. This study will linguistically provide a deeper understanding of the aspect, formation and meaning of Korean Josa or Ending combined plant names, as well as a valuable study related to Josa or Ending combined nouns.

한국어 종결어미 결합형 명사에 대한 연구

왕사우 ( Wang Siyu ) 중국한국(조선)어교육연구학회 2020 한국(조선)어교육연구 Vol.16 No.-

Typically, the final ending is used to end a phrase or sentence and not located at the right side of a word. But there is an interesting phenomenon in Korean that the final ending participates in word formation. The purpose of this paper is to examine the nouns formed by combining the final ending. The so-called “final ending combined noun” can be divided into two situations, one is when the final ending is concatenated at the end of a word and the other is that the final ending is concatenated in the middle of a word. In this paper, these two types of final ending combined nouns were studied and the formation of these nouns was discussed. Nouns ending with a final ending are formed by lexicalization, and words in the form of ‘final ending combined form + X’ are more appropriate to be recognized that the entire ‘final ending combined form + X’ is lexicalized rather than that the final ending combined form processed of becoming a root. Finally, the position of the final ending combined noun in the word system was discussed. Unlike previous studies, words that can be analyzed with [root + root] such as ‘ttesstapang, mekcakolmok’ and words that can be analyzed with [root + affix] such as ‘mwutcimasik, wulikanaminyacok’ are not viewed as compound words or derivative words. In this paper, these words were attributed as a subtype of ending combined words, considering the fact that final endings are combined to participate in word formation.

유형론적 관점에서 본 `N+genitive marker+N`형 단어

왕사우 ( Wang Siyu ) 서강대학교 언어정보연구소 2017 언어와 정보 사회 Vol.31 No.-

The words of `N+genitive marker+N` form exist not only in Korean, but also in a lot of other languages, such as Japanese, Chinese, French, and so on. In this paper, the similarity and difference of `N+genitive marker+N` form words in these languages are studied firstly. Thus it can be hypothesized that this type of words exist in inflectional language and agglutinative language as both typical words and semiwords, while they do not exist as typical words in isolated language. However, the existence of the words (or semi-words) of `N+genitive marker+N` form can be predicted to be universal in the dependent-marked languages. And the formation of `N+genitive marker+N` form word (wordization of syntactic structure and formation from fixed forms) is not a special form of word formation because it exists in many languages. In addition, the position of modifier noun and head noun in `N+genitive marker+N` form words differs from language to language. Therefore, the existence of the `N+genitive marker+N` form word in these languages is common but is characteristic for each language.

Understanding the Increasing Hot Extremes over the Northern Extratropics Using Community Atmosphere Model

Siyu Zhao,Jiaying Zhang,Yi Deng,Na Wang 한국기상학회 2022 Asia-Pacific Journal of Atmospheric Sciences Vol.58 No.3

The past four decades have seen an increase of terrestrial hot extremes during summer in the northern extratropics, accompanied by the Northern Hemisphere (NH) sea surface temperature (SST) warming (mainly over 10°–70°N, 0°–360°) and CO2 concentration rising. This study aims to understand possible causes for the increasing hot extremes, which are defined on a daily basis. We conduct a series of numerical experiments using the Community Atmosphere Model version 5 model for two periods, 1979–1995 and 2002–2018. The experiment by changing the CO2 concentration only with the climatological SST shows less increase of hot extremes days than that observed, whereas that by changing the NH SST (over 10°–70°N, 0°–360°) with constant CO2 concentration strengthens the hot extremes change over mid-latitudes. The experiment with both SST and CO2 concentration changes shows hot extremes change closer to the observation compared to the single-change experiments, as well as more similar simulations of atmospheric circulations and feedbacks from cloud and radiative processes. Also discussed are roles of natural variability (e.g., Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation) and other factors (e.g., Arctic sea ice and tropical SST).

Seroprevalence of Toxoplasma gondii in cats in mainland China 2016–2020: a meta-analysis

Siyu Zhou,Ziyin Sang,Lijun Wang,Tangjie Zhang 대한수의학회 2022 Journal of Veterinary Science Vol.23 No.1

Background: Toxoplasma gondii can infect humans and most animals and has a very high infection rate worldwide, including in China. The number of people infected with T. gondii in China increases with the number of cats. Objectives: We investigated the seropositive rate of T. gondii in cats over the last five years and analyzed the risk factors via meta-analysis. Methods: We retrieved 20 studies, with a total of 5,158 cats, published between 2016 and 2020, used the DerSimonian-Laird model and calculated seroprevalence estimates with the variance stabilizing double arcsine transformation. Results: The overall seroprevalence rate after sinusoidal conversion was 19.9% (95% confidence interval [CI], 15.9–23.9; 966/5,158), lower than the domestic report from 1995 to 2015 (24.5%, 95% CI, 20.1–29.0). There was substantial heterogeneity among studies (χ2 = 262.32; p < 0.001; I2 = 64.6%). Regression analysis of possible heterogeneous causes and subgroup analysis showed that age and whether cats were stray or not have a significant effect on the seropositive rate. Conclusions: Articles published in recent five years suggest that the seroprevalence estimates of Toxoplasma gondii in cats has decreased. Cats, as the final host of T. gondii, are an important cause of the spread of the parasite, and this is an important concern for public health.

Aerodynamic performance of high-lift blades in low-pressure turbines with periodic upstream wakes

Siyu Yang,Baopeng Xu,Fu Tian,Bin Wang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.5

The aerodynamic performance of high-lift blades was experimentally investigated at different Reynolds numbers ranging from 0.8×10 5 to 1.8×10 5 . Upstream wakes, inherent in real aero-engines, were generated by moving bars operating at reduced frequencies (Fr) of 0.3 and 0.6. Measurements were carried out by pneumatic probes and static pressure taps on the blade surfaces. The results show that high-lift blades experience a significant rise in profile loss under steady conditions, which is mitigated by upstream wakes due to the suppressed separation bubble. The loading distributions relate the non-dimensional flow deceleration rate (DR) to the profile loss. It is found that the variation pattern depends on the flow state, which is classified into parabolic increase, linear increase, and concave parabolic variation. A single hot-wire probe was employed to measure the boundary layer at the trailing edge. The results are used to examine the modified loss model based on Denton’s method.

Synthesis and Application of Phosphorus-containing Flame Retardant Plasticizer for Polyvinyl Chloride

Fang Wang,Siyu Pan,Peikun Zhang,Haojun Fan,Yi Chen,Jun Yan 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5

A novel phosphorus-containing flame retardant plasticizer (PFRP) derived from castor oil acid methyl ester (COME) was synthesized to substitute dioctyl phthalate (DOP) for plasticizing polyvinyl chloride (PVC) products. The chemical structures of PFRP were confirmed by fourier transform infrared spectroscopy (FTIR) and 1H nuclear magnetic resonance (1H NMR). Meanwhile, the plasticizing effect, flammability and thermal stability of plasticized PVC films were investigated by dynamic mechanical analyzer (DMA), limiting oxygen index (LOI) test, scanning electron microscope (SEM) and thermogravimetric analysis (TGA). As the PFRP content increasing from 0 wt% to 50 wt% amount of plasticizers, the plasticizing efficiency and the mechanical properties showed a slightly decreasing tendency compared with that of DOP, while the LOI value of plasticized PVC increased remarkably from 21.5 % to 25.2 %, showing a combined plasticizing efficiency and flame retardancy. SEM and TGA analysis indicated that PFRP had little effect on thermal stability but was effective to promote the formation of compact carbon residue.

Initial fault diagnosis of bearing based on AVMD-SE and multiscale enhanced morphological top-hat filter

Tong Wang,Changzheng Chen,Yuanqing Luo,Siyu Zhao,Shaohui Huang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12

Early fault signature detection and background noise removal are essential for bearing fault diagnosis. A novel multiscale enhanced morphological top-hat filter fault diagnosis method, adaptive variational mode decomposition-sample entropy-multiscale enhanced top-hat filter (AVMD-SE-MEMTF), is proposed based on AVMD-SE noise reduction. First, gray wolf optimization algorithm is proposed to optimize the VMD to achieve the optimal decomposition parameters adaptively and combine with SE to eliminate the high noise components and improve the noise reduction effect. Then, based on the pulse extraction property of morphological operations, the concept of MEMTF is proposed. To enhance the multiscale index selection strategy, a synthesis method of eigenfrequency envelope coefficients is constructed to increase the accuracy of the operator during the vibration signal process. Finally, experimental and engineering results show that the proposed method has good diagnostic performance for weak faults in the presence of noise interference.