David’s Story by Zoë Wicomb addresses the complexities of representing female suffering and the limitations of traditional historical narratives in capturing the experiences of marginalized bodies.It challenges ...David’s Story by Zoë Wicomb addresses the complexities of representing female suffering and the limitations of traditional historical narratives in capturing the experiences of marginalized bodies.It challenges the grand narratives of national history by emphasizing the indispensable role of women’s experiences.Through characters like Dulcie and Rachael,Wicomb portrays the female body as a site of resistance and resilience,highlighting the need for more nuanced and inclusive ways of documenting history.Underscoring the inexpressibility of trauma and the limitations of language and representation,the novel self-reflexively acknowledges its own aporia of completing the narrative,embodying the ongoing struggle to capture the full breadth of human experience.展开更多
Timbre,as one of the essential elements of sound,plays an important role in determining sound properties,whereas its manipulation has been remaining challenging for passive mechanical systems due to the intrinsic disp...Timbre,as one of the essential elements of sound,plays an important role in determining sound properties,whereas its manipulation has been remaining challenging for passive mechanical systems due to the intrinsic dispersion nature of resonances.Here,we present a meta-silencer supporting intensive mode density as well as highly tunable intrinsic loss and offering a fresh pathway for designable timbre in broadband.Strong global coupling is induced by intensive mode density and delicately modulated with the guidance of the theoretical model,which efficiently suppresses the resonance dispersion and provides desirable frequency-selective wave-manipulation capacity for timbre tuning.As proof-of-concept demonstrations for our design concepts,we propose three meta-silencers with the designing targets of high-efficiency broadband sound attenuation,efficiency-controlled sound attenuation and designable timbre,respectively.The proposed meta-silencers all operate in a broadband frequency range from 500 to 3200 Hz and feature deep-subwavelength sizes around 50 mm.Our work opens up a fundamental avenue to manipulate the timbre with passive resonances-controlled acoustic metamaterials and may inspire the development of novel multifunctional devices in noise-control engineering,impedance engineering,and architectural acoustics.展开更多
The contribution moves from highlighting how,in the context of Michel Serres’and posthumanism’s proposal of rethinking the human and the world in a perspective of inter-implication and universal co-belonging,silence...The contribution moves from highlighting how,in the context of Michel Serres’and posthumanism’s proposal of rethinking the human and the world in a perspective of inter-implication and universal co-belonging,silence(of the human word)assumes the function of a catalyst for the recognition/re-aestheticization of the human body in its sensory-aesthetic-cognitive-relational-hybrid dimensionality,and,with and for it,of the world in its agency(including artistic).Within the framework of this perspective,the investigation thus proposes a reading of art as a relation/catalyzer of relations,that is,as a(re)activation of positive relations of the human with and for a world that reveals itself to be increasingly hyper-complex,that is,more-than-human,in the continuity/inseparability of nature and culture.Taking Serresian ideas on artistic practices as non(only)human forms of expression and posthumanist“isomorphic”positions on non-human agency as tools,the research then highlights the“more-than-human”scope of art and the fact that artistic practices are responsive actions.So much so that,the human being emerges as co-agent and,of course,co-owner.展开更多
Toni Morrison has made great achievements in American literary history. In her famous work Sula, motherhood is an essential theme which has attracted public attention. This essay interprets the abnormal maternal love ...Toni Morrison has made great achievements in American literary history. In her famous work Sula, motherhood is an essential theme which has attracted public attention. This essay interprets the abnormal maternal love provided by silenced black mothers in Sula and the ways for black women to break the silence.展开更多
The optimization of the acoustic silencer volume is very important to develop it and to get high-performance,the importance of the silencer was appeared in industrial field to eliminate the noise of the duct by effici...The optimization of the acoustic silencer volume is very important to develop it and to get high-performance,the importance of the silencer was appeared in industrial field to eliminate the noise of the duct by efficient and economical method.The main goal of this research is to optimize the transmission loss(TL)by analytical method of the Double-Chamber Silencer(DCS),the TL has been selected as the main parameter in silencer because it does not based on the source or the termination impedances.First we calculated the power transmission coefficient(PTC)and the TL of an acoustic silencer,then used the Lagrange method to optimize the silencer length.All calculation of silencer data is obtained by solving the governing equations in commercial software Matlab®.A several calculations for different silencer length at many frequency ranges were performed simultaneously.Finally,this research supports the efficient and rapid techniques for DCS optimal design under narrow space.The results show that the acoustic TL is maximized at the desired frequency.展开更多
Non-native-English-speaking (NNS) students' silent and reticent behaviour,which make the EAP (English for Academic Purpose) class seem ineffective and boring,might be unfavourably evaluated by a native English spe...Non-native-English-speaking (NNS) students' silent and reticent behaviour,which make the EAP (English for Academic Purpose) class seem ineffective and boring,might be unfavourably evaluated by a native English speaker of Western culture. By giving an overview of international students' inactive participation in the classroom,which prevents teachers from Western culture making a proper judgement on study mood,this paper will explore culturally based perceptions of international students' silent and reticent behaviour in the EAP classroom,and analyse the reasons behind NNS students' silent reaction.展开更多
Silence,as a type of non-verbal communication,expresses special meanings of the speakers.The core of this study is focused on the functions of silence in conversations from the famous American TV series Prison Break(S...Silence,as a type of non-verbal communication,expresses special meanings of the speakers.The core of this study is focused on the functions of silence in conversations from the famous American TV series Prison Break(Season I),in order to reveal that silence,as an important tool in human communication,has richness of meaning and complexity of use.展开更多
Traditionally, silence is regarded as an absence, inaction, emptiness, or inferiority, but it figures in Woolf's novels as a presence, power, creativity, and superiority, and infused with a new psychic and narrati...Traditionally, silence is regarded as an absence, inaction, emptiness, or inferiority, but it figures in Woolf's novels as a presence, power, creativity, and superiority, and infused with a new psychic and narrative life. The present paper will examine Woolf's expression of silence in her masterpiece To the Lighthouse to reveal the power of silence.展开更多
This study is aimed at the common classroom silence phenomenon in contemporary college English class. First of all, thispaper explains the meaning of silence from the pragmatic point of view, and takes the students in...This study is aimed at the common classroom silence phenomenon in contemporary college English class. First of all, thispaper explains the meaning of silence from the pragmatic point of view, and takes the students in the Xi’an Innovation College ofYan’an University for instance. Based on a questionnaire survey of 200 students in the Xi’an Innovation College of Yan’an Univer-sity, the reasons are analyzed from two perspectives of teachers and students. This paper makes an analysis of all kinds of factors,so as to put forward effective solutions to eliminate the classroom silence.展开更多
This paper makes a study of silence from cross-culture perspective and holds that silence is an indispensable component of human communication without which the proper decoding of the information would be impossible.
Dear editors:In the beginning of the 1980’s when the ignorance,the fear and the prejudice in response to IIIV were common,a lot of countries set restrictions for those infected who arrived and wanted to live in those...Dear editors:In the beginning of the 1980’s when the ignorance,the fear and the prejudice in response to IIIV were common,a lot of countries set restrictions for those infected who arrived and wanted to live in those countries.Besides the significant progress in the knowledge achieved since then,mainly how the virus is transmitted,and how it is not。展开更多
The sound of silence是美国著名电影The Graduate(《毕业生》)的主题曲,在成就《毕业生》这部经典之作的诸多因素中,主题曲The sound of silence无疑是一个很大的亮点,当这首歌曲一度风靡美国时,这首歌曲的创作者保罗西蒙和演绎者阿特...The sound of silence是美国著名电影The Graduate(《毕业生》)的主题曲,在成就《毕业生》这部经典之作的诸多因素中,主题曲The sound of silence无疑是一个很大的亮点,当这首歌曲一度风靡美国时,这首歌曲的创作者保罗西蒙和演绎者阿特加芬克尔名气大增。本文运用现代文体学理论,从语言描述、语境因素和语篇分析三个方面分析这首歌曲的文体特征,使人们更好地理解和鉴赏这首英文歌曲。展开更多
Heathcliff is a highly controversial character in Emily Bront 's canon Wuthering Heights. He is depicted as an incredi ble conglomeration of enigmas and simplicity, aloofness and affinity, ferocity and vulnerabili...Heathcliff is a highly controversial character in Emily Bront 's canon Wuthering Heights. He is depicted as an incredi ble conglomeration of enigmas and simplicity, aloofness and affinity, ferocity and vulnerability, inhumanity and heroicity, a man who appears more silent and preoccupied than talkative and carefree, inaudible and incalculable in both words and thoughts. The author of this paper considers that there is much left to be read and contemplate on in Heathcliff's silence and thus make a tempa tive research into Heathcliff's silence by discerning its manifestations and probing its causes, in order to resonate with the inner touch of this complicated soul and relate his silence with the spirit that Emily Bront wished to deliver through Wuthering Heights. Heathcliff's silence manifests as muteness, elusion and colloquial or physical violence. In his whole life, Heathcliff inter mittently experiences the self-chosen silence and the forced silence. He chooses to be silence out of self-protection and the infe riority complex; he considers silence as a token of masculinity. And the ruthless force from outside also compels him into a periph eralized situation where he has to keep silent and struggles against the torture and torment alone.展开更多
Harold Pinter is one of the famous absurdist play writer in England. His works and language are full of absurd color,which is the focus of critics. Silence is a trademark of Harold Pinter's writing. He uses it to ...Harold Pinter is one of the famous absurdist play writer in England. His works and language are full of absurd color,which is the focus of critics. Silence is a trademark of Harold Pinter's writing. He uses it to an exquisite manner that he forms his individual"Pinteresque"silence. Silences in his play appear many times and act as a natural barrier for true self. This paper will take Pinter's early work"The Dumb Waiter"for example to analysis the wide usage of silences in the play. The paper tries to un mask the truth under silences. And by exploring the two types of silences, we can see characters' true emotion and intention un derground.展开更多
It is for so many years that silence of English class in China has existed drawing attentions from scholars in and abroad.The paper,with the methodology of Ethnography of communication-observation,interview,survey and...It is for so many years that silence of English class in China has existed drawing attentions from scholars in and abroad.The paper,with the methodology of Ethnography of communication-observation,interview,survey and comprehensive analysis,concluded that silence of English class in China is not an coincident event,but a certain event in the process of education mainly owing to the course requirements and educational atmosphere like size of English class.展开更多
Chinese students tend to keep silent in class and bear in mind what has been taught passively rather than expressing their ideas actively like western students, which concerns Chinese teachers deeply because of the un...Chinese students tend to keep silent in class and bear in mind what has been taught passively rather than expressing their ideas actively like western students, which concerns Chinese teachers deeply because of the unsatisfactory class production. From the perspectives of "face" in Politeness Principle on the basis of cultural dimensions, this paper mainly focuses on class silence with a comparison between different cultures in the east and west, explores the true reasons for its happening in China and constructs a reference research for follow-up studies.展开更多
Objective To investigate the effect of c-fos gene silencing on differentially expressed proteins(DEPs) in human bronchial epithelial(HBE) cells after exposure to fine particulate matter(PM2.5).Methods HBE cells and c-...Objective To investigate the effect of c-fos gene silencing on differentially expressed proteins(DEPs) in human bronchial epithelial(HBE) cells after exposure to fine particulate matter(PM2.5).Methods HBE cells and c-fos-silenced HBE cells were exposed to 50 μg/mL PM2.5, LC-MS/MS and tandem mass tag(TMT) labeling methods were combined with bioinformatics methods, and DEPs and interaction networks were identified.Results In the HBE group, 414 DEPs were screened, of which 227 were up-regulated and 187 downregulated. In the c-fos silenced HBE group, 480 DEPs were screened, including 240 up-regulated proteins and 240 down-regulated proteins. KEGG annotations showed that DEPs in the HBE group are mainly concentrated in the glycolysis/gluconeogenesis pathway and those in the c-fos silenced group are concentrated mainly in endoplasmic reticulum and the processing of proteins. Additionally, the abnormal expression of GPRC5 C, DKK4, and UBE2 C was identified in top 15 DEPs. After constructing the protein interaction network, 20 Hub proteins including HNRNPA2 B1, HNRNPL, RPS15 A, and RPS25 were screened from the HBE group and the c-fos silenced HBE group.Conclusion c-fos gene affected the expression of cancer-related proteins. Our results provided a scientific basis for further study of PM2.5-induced carcinogenesis mechanism.展开更多
Acoustic performance of dissipative silencer was evaluated to determine the effectiveness of perforated duct porosity and absorbent material density in reducing occupational noise exposure propagated from centrifugal...Acoustic performance of dissipative silencer was evaluated to determine the effectiveness of perforated duct porosity and absorbent material density in reducing occupational noise exposure propagated from centrifugal fan.Design charts were applied to predict noise reduction and length of a dissipative silencer.Dissipative silencers with various punched duct porosity(14%,30%and 40%)and sound absorbent density(80 Kg/m^(3),120 Kg/m^(3),and 140 Kg/m^(3))were designed and fabricated.According to ISO9612 and ISO11820,noise level was measured before and after installing all nine test silencers at fixed workstations around the discharge side of a centrifugal fan in a manufacturing plant.On average,the noise level at the discharge side of a fan without silencer was measured to be 93.6 dBA,whereas it was significantly mitigated by 67.4 dBA to 70.1 dBA after installing all silencers.Dynamic insertion loss for a dissipative silencer with 100 cm length was predicted to be 27.9 dB,which was in agreement with experimental ones.Although,there was no significant differences between insertion loss of silencers,the one with 30%porosity and 120 Kg/m^(3)rock wool density had the highest insertion loss of 26.2 dBA.Dissipative silencers noticeably reduced centrifugal fan noise exposures.Increasing sound absorbent density and duct porosity up to a certain limit could probably be effective in noise reduction of dissipative silencers.展开更多
The development of electronic information technology has made workplace gossip more ubiquitous.As a part of interpersonal communication on informal occasions,positive workplace gossip affects individuals’mood,cogni-t...The development of electronic information technology has made workplace gossip more ubiquitous.As a part of interpersonal communication on informal occasions,positive workplace gossip affects individuals’mood,cogni-tion,and behaviors.In light of this and based on the Social Interdependence Theory,the study proposed that positive workplace gossip has a negative effect on employee silence,and psychological safety mediates this rela-tionship.In addition,the promotion-focused moderates the relationship between psychological safety and employee silence.Based on a two-wave sampling design from 311 innovative enterprises employees,the results of Structural Equation Model by AMOS 22.0 and Mplus 7.0 supported all the hypotheses.Results revealed that positive workplace gossip can decrease the employee silence through the mediating role of psychological safety and moderating role of promotion-focused.Thesefindings provided theoretical implications and practical sugges-tions for enterprise managers to create positive communication climate to reduce employee silence.展开更多
基金This work was supported by Humanities and Social Sciences Fund of Ministry of Education of China(No.19XJA7520012020)by National Social Science Fund of China(No.20BWW069).
文摘David’s Story by Zoë Wicomb addresses the complexities of representing female suffering and the limitations of traditional historical narratives in capturing the experiences of marginalized bodies.It challenges the grand narratives of national history by emphasizing the indispensable role of women’s experiences.Through characters like Dulcie and Rachael,Wicomb portrays the female body as a site of resistance and resilience,highlighting the need for more nuanced and inclusive ways of documenting history.Underscoring the inexpressibility of trauma and the limitations of language and representation,the novel self-reflexively acknowledges its own aporia of completing the narrative,embodying the ongoing struggle to capture the full breadth of human experience.
文摘Timbre,as one of the essential elements of sound,plays an important role in determining sound properties,whereas its manipulation has been remaining challenging for passive mechanical systems due to the intrinsic dispersion nature of resonances.Here,we present a meta-silencer supporting intensive mode density as well as highly tunable intrinsic loss and offering a fresh pathway for designable timbre in broadband.Strong global coupling is induced by intensive mode density and delicately modulated with the guidance of the theoretical model,which efficiently suppresses the resonance dispersion and provides desirable frequency-selective wave-manipulation capacity for timbre tuning.As proof-of-concept demonstrations for our design concepts,we propose three meta-silencers with the designing targets of high-efficiency broadband sound attenuation,efficiency-controlled sound attenuation and designable timbre,respectively.The proposed meta-silencers all operate in a broadband frequency range from 500 to 3200 Hz and feature deep-subwavelength sizes around 50 mm.Our work opens up a fundamental avenue to manipulate the timbre with passive resonances-controlled acoustic metamaterials and may inspire the development of novel multifunctional devices in noise-control engineering,impedance engineering,and architectural acoustics.
文摘The contribution moves from highlighting how,in the context of Michel Serres’and posthumanism’s proposal of rethinking the human and the world in a perspective of inter-implication and universal co-belonging,silence(of the human word)assumes the function of a catalyst for the recognition/re-aestheticization of the human body in its sensory-aesthetic-cognitive-relational-hybrid dimensionality,and,with and for it,of the world in its agency(including artistic).Within the framework of this perspective,the investigation thus proposes a reading of art as a relation/catalyzer of relations,that is,as a(re)activation of positive relations of the human with and for a world that reveals itself to be increasingly hyper-complex,that is,more-than-human,in the continuity/inseparability of nature and culture.Taking Serresian ideas on artistic practices as non(only)human forms of expression and posthumanist“isomorphic”positions on non-human agency as tools,the research then highlights the“more-than-human”scope of art and the fact that artistic practices are responsive actions.So much so that,the human being emerges as co-agent and,of course,co-owner.
文摘Toni Morrison has made great achievements in American literary history. In her famous work Sula, motherhood is an essential theme which has attracted public attention. This essay interprets the abnormal maternal love provided by silenced black mothers in Sula and the ways for black women to break the silence.
文摘The optimization of the acoustic silencer volume is very important to develop it and to get high-performance,the importance of the silencer was appeared in industrial field to eliminate the noise of the duct by efficient and economical method.The main goal of this research is to optimize the transmission loss(TL)by analytical method of the Double-Chamber Silencer(DCS),the TL has been selected as the main parameter in silencer because it does not based on the source or the termination impedances.First we calculated the power transmission coefficient(PTC)and the TL of an acoustic silencer,then used the Lagrange method to optimize the silencer length.All calculation of silencer data is obtained by solving the governing equations in commercial software Matlab®.A several calculations for different silencer length at many frequency ranges were performed simultaneously.Finally,this research supports the efficient and rapid techniques for DCS optimal design under narrow space.The results show that the acoustic TL is maximized at the desired frequency.
文摘Non-native-English-speaking (NNS) students' silent and reticent behaviour,which make the EAP (English for Academic Purpose) class seem ineffective and boring,might be unfavourably evaluated by a native English speaker of Western culture. By giving an overview of international students' inactive participation in the classroom,which prevents teachers from Western culture making a proper judgement on study mood,this paper will explore culturally based perceptions of international students' silent and reticent behaviour in the EAP classroom,and analyse the reasons behind NNS students' silent reaction.
文摘Silence,as a type of non-verbal communication,expresses special meanings of the speakers.The core of this study is focused on the functions of silence in conversations from the famous American TV series Prison Break(Season I),in order to reveal that silence,as an important tool in human communication,has richness of meaning and complexity of use.
文摘Traditionally, silence is regarded as an absence, inaction, emptiness, or inferiority, but it figures in Woolf's novels as a presence, power, creativity, and superiority, and infused with a new psychic and narrative life. The present paper will examine Woolf's expression of silence in her masterpiece To the Lighthouse to reveal the power of silence.
文摘This study is aimed at the common classroom silence phenomenon in contemporary college English class. First of all, thispaper explains the meaning of silence from the pragmatic point of view, and takes the students in the Xi’an Innovation College ofYan’an University for instance. Based on a questionnaire survey of 200 students in the Xi’an Innovation College of Yan’an Univer-sity, the reasons are analyzed from two perspectives of teachers and students. This paper makes an analysis of all kinds of factors,so as to put forward effective solutions to eliminate the classroom silence.
文摘This paper makes a study of silence from cross-culture perspective and holds that silence is an indispensable component of human communication without which the proper decoding of the information would be impossible.
文摘Dear editors:In the beginning of the 1980’s when the ignorance,the fear and the prejudice in response to IIIV were common,a lot of countries set restrictions for those infected who arrived and wanted to live in those countries.Besides the significant progress in the knowledge achieved since then,mainly how the virus is transmitted,and how it is not。
文摘The sound of silence是美国著名电影The Graduate(《毕业生》)的主题曲,在成就《毕业生》这部经典之作的诸多因素中,主题曲The sound of silence无疑是一个很大的亮点,当这首歌曲一度风靡美国时,这首歌曲的创作者保罗西蒙和演绎者阿特加芬克尔名气大增。本文运用现代文体学理论,从语言描述、语境因素和语篇分析三个方面分析这首歌曲的文体特征,使人们更好地理解和鉴赏这首英文歌曲。
文摘Heathcliff is a highly controversial character in Emily Bront 's canon Wuthering Heights. He is depicted as an incredi ble conglomeration of enigmas and simplicity, aloofness and affinity, ferocity and vulnerability, inhumanity and heroicity, a man who appears more silent and preoccupied than talkative and carefree, inaudible and incalculable in both words and thoughts. The author of this paper considers that there is much left to be read and contemplate on in Heathcliff's silence and thus make a tempa tive research into Heathcliff's silence by discerning its manifestations and probing its causes, in order to resonate with the inner touch of this complicated soul and relate his silence with the spirit that Emily Bront wished to deliver through Wuthering Heights. Heathcliff's silence manifests as muteness, elusion and colloquial or physical violence. In his whole life, Heathcliff inter mittently experiences the self-chosen silence and the forced silence. He chooses to be silence out of self-protection and the infe riority complex; he considers silence as a token of masculinity. And the ruthless force from outside also compels him into a periph eralized situation where he has to keep silent and struggles against the torture and torment alone.
文摘Harold Pinter is one of the famous absurdist play writer in England. His works and language are full of absurd color,which is the focus of critics. Silence is a trademark of Harold Pinter's writing. He uses it to an exquisite manner that he forms his individual"Pinteresque"silence. Silences in his play appear many times and act as a natural barrier for true self. This paper will take Pinter's early work"The Dumb Waiter"for example to analysis the wide usage of silences in the play. The paper tries to un mask the truth under silences. And by exploring the two types of silences, we can see characters' true emotion and intention un derground.
文摘It is for so many years that silence of English class in China has existed drawing attentions from scholars in and abroad.The paper,with the methodology of Ethnography of communication-observation,interview,survey and comprehensive analysis,concluded that silence of English class in China is not an coincident event,but a certain event in the process of education mainly owing to the course requirements and educational atmosphere like size of English class.
文摘Chinese students tend to keep silent in class and bear in mind what has been taught passively rather than expressing their ideas actively like western students, which concerns Chinese teachers deeply because of the unsatisfactory class production. From the perspectives of "face" in Politeness Principle on the basis of cultural dimensions, this paper mainly focuses on class silence with a comparison between different cultures in the east and west, explores the true reasons for its happening in China and constructs a reference research for follow-up studies.
基金This project was supported by the programs of Shenzhen Science and Technology Innovation Committee to XU Xin Yun[JCYJ20170413101713324,JCYJ20190807102205480]Shenzhen Key Medical Discipline Construction Fund[SZXK067].
文摘Objective To investigate the effect of c-fos gene silencing on differentially expressed proteins(DEPs) in human bronchial epithelial(HBE) cells after exposure to fine particulate matter(PM2.5).Methods HBE cells and c-fos-silenced HBE cells were exposed to 50 μg/mL PM2.5, LC-MS/MS and tandem mass tag(TMT) labeling methods were combined with bioinformatics methods, and DEPs and interaction networks were identified.Results In the HBE group, 414 DEPs were screened, of which 227 were up-regulated and 187 downregulated. In the c-fos silenced HBE group, 480 DEPs were screened, including 240 up-regulated proteins and 240 down-regulated proteins. KEGG annotations showed that DEPs in the HBE group are mainly concentrated in the glycolysis/gluconeogenesis pathway and those in the c-fos silenced group are concentrated mainly in endoplasmic reticulum and the processing of proteins. Additionally, the abnormal expression of GPRC5 C, DKK4, and UBE2 C was identified in top 15 DEPs. After constructing the protein interaction network, 20 Hub proteins including HNRNPA2 B1, HNRNPL, RPS15 A, and RPS25 were screened from the HBE group and the c-fos silenced HBE group.Conclusion c-fos gene affected the expression of cancer-related proteins. Our results provided a scientific basis for further study of PM2.5-induced carcinogenesis mechanism.
基金the framework of a faculty research project under the code of Ethics Committee of IR.QUMS.REC.1396.163.We also thank Mehrdad Keshavarz Siahposh and Mohammad Soleiman Abady for their technical assistance in all our experimental work.
文摘Acoustic performance of dissipative silencer was evaluated to determine the effectiveness of perforated duct porosity and absorbent material density in reducing occupational noise exposure propagated from centrifugal fan.Design charts were applied to predict noise reduction and length of a dissipative silencer.Dissipative silencers with various punched duct porosity(14%,30%and 40%)and sound absorbent density(80 Kg/m^(3),120 Kg/m^(3),and 140 Kg/m^(3))were designed and fabricated.According to ISO9612 and ISO11820,noise level was measured before and after installing all nine test silencers at fixed workstations around the discharge side of a centrifugal fan in a manufacturing plant.On average,the noise level at the discharge side of a fan without silencer was measured to be 93.6 dBA,whereas it was significantly mitigated by 67.4 dBA to 70.1 dBA after installing all silencers.Dynamic insertion loss for a dissipative silencer with 100 cm length was predicted to be 27.9 dB,which was in agreement with experimental ones.Although,there was no significant differences between insertion loss of silencers,the one with 30%porosity and 120 Kg/m^(3)rock wool density had the highest insertion loss of 26.2 dBA.Dissipative silencers noticeably reduced centrifugal fan noise exposures.Increasing sound absorbent density and duct porosity up to a certain limit could probably be effective in noise reduction of dissipative silencers.
基金funded by the National Natural Science Foundation of China Project(71801017,72002016,71901031,71802025)Project of Beijing Social Science(No.18GLC064).
文摘The development of electronic information technology has made workplace gossip more ubiquitous.As a part of interpersonal communication on informal occasions,positive workplace gossip affects individuals’mood,cogni-tion,and behaviors.In light of this and based on the Social Interdependence Theory,the study proposed that positive workplace gossip has a negative effect on employee silence,and psychological safety mediates this rela-tionship.In addition,the promotion-focused moderates the relationship between psychological safety and employee silence.Based on a two-wave sampling design from 311 innovative enterprises employees,the results of Structural Equation Model by AMOS 22.0 and Mplus 7.0 supported all the hypotheses.Results revealed that positive workplace gossip can decrease the employee silence through the mediating role of psychological safety and moderating role of promotion-focused.Thesefindings provided theoretical implications and practical sugges-tions for enterprise managers to create positive communication climate to reduce employee silence.