In this research paper,we propose a corpus for the task of detecting religious extremism in social networks and open sources and compare various machine learning algorithms for the binary classification problem using ...In this research paper,we propose a corpus for the task of detecting religious extremism in social networks and open sources and compare various machine learning algorithms for the binary classification problem using a previously created corpus,thereby checking whether it is possible to detect extremist messages in the Kazakh language.To do this,the authors trained models using six classic machine-learning algorithms such as Support Vector Machine,Decision Tree,Random Forest,K Nearest Neighbors,Naive Bayes,and Logistic Regression.To increase the accuracy of detecting extremist texts,we used various characteristics such as Statistical Features,TF-IDF,POS,LIWC,and applied oversampling and undersampling techniques to handle imbalanced data.As a result,we achieved 98%accuracy in detecting religious extremism in Kazakh texts for the collected dataset.Testing the developed machine learningmodels in various databases that are often found in everyday life“Jokes”,“News”,“Toxic content”,“Spam”,“Advertising”has also shown high rates of extremism detection.展开更多
Since the first years of independence,Uzbekistan began to develop and implement a policy of countering religious extremism and addressing the ideological basis of terrorism.Taking into consideration the complexity of ...Since the first years of independence,Uzbekistan began to develop and implement a policy of countering religious extremism and addressing the ideological basis of terrorism.Taking into consideration the complexity of this problem,Uzbekistan is comprehensively combating expressions of extremism and terrorism.展开更多
This paper illuminates some of the main effects that neoliberalism has on the psychological and socio-economic profile of Americans.It outlines the structural processes that produced the groundwork for today’s enormo...This paper illuminates some of the main effects that neoliberalism has on the psychological and socio-economic profile of Americans.It outlines the structural processes that produced the groundwork for today’s enormous popularity of right-wing extremism in the USA.America’s middle-class has turned right-wing extremist during the Trump years and this trend has continued to dominate American politics today.While populism mobilizes feelings of injustice and grievances,the source and commencement of these grievances is the centerpiece of this article.The paper does so by applying Rodrigo Nunes’(2020a)analysis of the effects of Bolsenarismo in Brazil to the American society.The paper differentiates between the effects of individualism,punitivism,and the valorization of order above the law and shows how these trends have influenced preponderant identity traits of Baby Boomers and Generation X.Secondly,the paper focuses on the concept of“negative solidarity”which is one direct consequence of the worldview produced by successful indoctrination of neoliberal values and goes hand in hand with the consequent pauperization of the American worker.The preponderance of negative solidarity remains a key handicap for a democratic future and for any social mobilization efforts within the USA.展开更多
March 2019 Contents Foreword I.Xinjiang Has Long Been an Inseparable Part of Chinese Territory II.The Origin of Terrorism and Extremism in Xinjiang III.Violent Terrorism and Religious Extremism Are Grave Abuses of Hum...March 2019 Contents Foreword I.Xinjiang Has Long Been an Inseparable Part of Chinese Territory II.The Origin of Terrorism and Extremism in Xinjiang III.Violent Terrorism and Religious Extremism Are Grave Abuses of Human Rights IV.Striking at Terrorism and Extremism in Accordance with the Law V.Giving Top Priority to a Preventive Counterterrorism Approach VI.Finding Experience for Counterterrorism and De-radicalization VII.展开更多
In the context of globalization, violent extremist forces pose a serious threat to the fundamental human rights of the people all over the world. Strengthening human rights protection requires reinforcing the momentum...In the context of globalization, violent extremist forces pose a serious threat to the fundamental human rights of the people all over the world. Strengthening human rights protection requires reinforcing the momentum to crack down and prevent the violent acts of extremist forces. As one of the countries that is the victim of violence by extremists, China has taken a series of measures to tackle the challenges of violent extremism. As President Xi Jinping has pointed out, 'the realization of the full enjoyment of human rights by human beings is the common goal of human society.' While establishing a community of common destiny for all mankind, the international community should take action to effectively address the root causes of violent extremism, maintain a peaceful and secure development environment, and defend the basic human rights and well-being of all peoples, so as to ensure a safe and brighter future for all.展开更多
For today＇s human rights protection, it is requisite to firmly oppose religious ex- tremism, no matter whether in China or worldwide. Religious extremism is a rather serious phenomenon in the political life of today...For today＇s human rights protection, it is requisite to firmly oppose religious ex- tremism, no matter whether in China or worldwide. Religious extremism is a rather serious phenomenon in the political life of today＇s world. In the form of religion （including banners, words, symbols and costumes, etc）, it agitates for the extreme claims and fanatical behavior of certain groups and damages social stability, so that it can serve its villainous purposes.展开更多
After the collapse of the Mubarak regime,the activities of Islamic extremism organisations in Egypt have been frequent,which brought great challenges to national security and social stability.After Sisi came into powe...After the collapse of the Mubarak regime,the activities of Islamic extremism organisations in Egypt have been frequent,which brought great challenges to national security and social stability.After Sisi came into power,the Egyptian government took various measures to actively promote the de-extremism work,however,the difficulties in the process of Egypt’s de-extremism cannot be ignored.Whether the transition of de-extremism from a movement to a institution can be realised will be the key to its longterm effect.展开更多
In this paper,I examine the Twitter accounts of right-wing extremist groups(RWEGs)in India,arguing that the abjectification of Muslim masculinities is central to the narratives of Hindu supremacist groups.The abjectif...In this paper,I examine the Twitter accounts of right-wing extremist groups(RWEGs)in India,arguing that the abjectification of Muslim masculinities is central to the narratives of Hindu supremacist groups.The abjectification process on Twitter serves as a rhetorical device to:a)criticize and problematize Muslim masculinities;b)idealize and glorify Hindu and white masculinities;c)promote Hindu and white masculine nationalist projects;and d)unify Hindu supremacists against Muslim others.By analyzing the gender ideologies expressed implicitly or explicitly on the Twitter accounts of RWEGs,and using the“Love Jihad”conspiracy case as a focal point,I demonstrate how the abjectification of Muslim masculinities is constructed in opposition to the idealized Hindu masculinities.This study highlights the intersection of gender and nationalism in the digital discourse of Hindu supremacist groups,offering insights into the mechanisms through which social media platforms are used to reinforce and propagate Islamophobic ideologies.展开更多
While the fall of Raqqa signalled the steady decline and“defeat”of the Islamic State(IS),it did not guarantee the end of its ideology of violent extremism.The possibility of the organisation reinventing itself in di...While the fall of Raqqa signalled the steady decline and“defeat”of the Islamic State(IS),it did not guarantee the end of its ideology of violent extremism.The possibility of the organisation reinventing itself in different and perhaps more lethal ways is very high.States,therefore,must adopt measures that are based on holistic,multi-stakeholder approaches rather than on military and securitised responses to counter and ultimately prevent the spread of violent extremist ideology.The countries of the Gulf have the advantage of a“youth bulge,”with almost half its population under the age of 30 years.This“youth bulge”is however a double-edged sword.This large pool of human capital could be a demographic dividend,if harnessed intelligently,while conversely it could prove to be a demographic disaster if timely and plausible solutions to the various issues faced are not provided.This paper will explore ways in which preventing and countering violent extremism(P/CVE)through education could be achieved by including a variety of stakeholders from faith based organisations,the corporate sector,media and academia in the formulation of appropriate educational responses which take into account issues like culture,identity and religiosity.These re-education programmes should form an integral part of P/CVE policies,thereby providing the much needed psycho-social angle to an otherwise hard security-driven discourse.It is against this rationale that this paper makes a case for P/CVE through education,encompassing the formal,informal and non-formal levels,as one of the possible means for promoting and fostering a peace process in the Gulf.展开更多
A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isotherm...A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isothermal experiments. As a result of the competitive diffusion of alloying elements, the oxide scale included an outermost porous oxide layer (OOL), an inner relatively dense oxide layer (IOL), and an internal oxide zone (IOZ), depending on the temperature and time. A high temperature led to the formation of large voids at the IOL/IOZ interface. At 1200℃, the continuity of the Cr-rich oxide layer in the IOL was destroyed, and thus, spallation occurred. Extension of oxidation time contributed to the size of Al-rich oxide particles with the increase in the IOZ. Based on this finding,the oxidation kinetics of GH4738 was discussed, and the corresponding oxidation behavior at 900-1100℃ was predicted.展开更多
Heavy precipitation and extreme drought have caused severe economic losses over South China and Indochina(INCSC)in recent decades.Given the areas with large gross domestic product(GDP)in the INCSC region are distribut...Heavy precipitation and extreme drought have caused severe economic losses over South China and Indochina(INCSC)in recent decades.Given the areas with large gross domestic product(GDP)in the INCSC region are distributed along the coastline and greatly affected by global warming,understanding the possible economic impacts induced by future changes in the maximum consecutive 5-day precipitation(RX5day)and the maximum consecutive dry days(CDD)is critical for adaptation planning in this region.Based on the latest data released by phase 6 of the Coupled Model Intercomparison Project(CMIP6),future projections of precipitation extremes with bias correction and their impacts on GDP over the INCSC region under the fossil-fueled development Shared Socioeconomic Pathway(SSP5-8.5)are investigated.Results indicate that RX5day will intensify robustly throughout the INCSC region,while CDD will lengthen in most regions under global warming.The changes in climate consistently dominate the effect on GDP over the INCSC region,rather than the change of GDP.If only considering the effect of climate change on GDP,the changes in precipitation extremes bring a larger impact on the economy in the future to the provinces of Hunan,Jiangxi,Fujian,Guangdong,and Hainan in South China,as well as the Malay Peninsula and southern Cambodia in Indochina.Thus,timely regional adaptation strategies are urgent for these regions.Moreover,from the sub-regional average viewpoint,over two thirds of CMIP6 models agree that maintaining a lower global warming level will reduce the economic impacts from heavy precipitation over the INCSC region.展开更多
Due to the interdependency of frame synchronization(FS)and channel estimation(CE),joint FS and CE(JFSCE)schemes are proposed to enhance their functionalities and therefore boost the overall performance of wireless com...Due to the interdependency of frame synchronization(FS)and channel estimation(CE),joint FS and CE(JFSCE)schemes are proposed to enhance their functionalities and therefore boost the overall performance of wireless communication systems.Although traditional JFSCE schemes alleviate the influence between FS and CE,they show deficiencies in dealing with hardware imperfection(HI)and deterministic line-of-sight(LOS)path.To tackle this challenge,we proposed a cascaded ELM-based JFSCE to alleviate the influence of HI in the scenario of the Rician fading channel.Specifically,the conventional JFSCE method is first employed to extract the initial features,and thus forms the non-Neural Network(NN)solutions for FS and CE,respectively.Then,the ELMbased networks,named FS-NET and CE-NET,are cascaded to capture the NN solutions of FS and CE.Simulation and analysis results show that,compared with the conventional JFSCE methods,the proposed cascaded ELM-based JFSCE significantly reduces the error probability of FS and the normalized mean square error(NMSE)of CE,even against the impacts of parameter variations.展开更多
The Tibetan Plateau(TP)is a prevalent region for convection systems due to its unique thermodynamic forcing.This study investigated isolated deep convections(IDCs),which have a smaller spatial and temporal size than m...The Tibetan Plateau(TP)is a prevalent region for convection systems due to its unique thermodynamic forcing.This study investigated isolated deep convections(IDCs),which have a smaller spatial and temporal size than mesoscale convective systems(MCSs),over the TP in the rainy season(June-September)during 2001–2020.The authors used satellite precipitation and brightness temperature observations from the Global Precipitation Measurement mission.Results show that IDCs mainly concentrate over the southern TP.The IDC number per rainy season decreases from around 140 over the southern TP to around 10 over the northern TP,with an average 54.2.The initiation time of IDCs exhibits an obvious diurnal cycle,with the peak at 1400–1500 LST and the valley at 0900–1000 LST.Most IDCs last less than five hours and more than half appear for only one hour.IDCs generally have a cold cloud area of 7422.9 km^(2),containing a precipitation area of approximately 65%.The larger the IDC,the larger the fraction of intense precipitation it contains.IDCs contribute approximately 20%–30%to total precipitation and approximately 30%–40%to extreme precipitation over the TP,with a larger percentage in July and August than in June and September.In terms of spatial distribution,IDCs contribute more to both total precipitation and extreme precipitation over the TP compared to the surrounding plain regions.IDCs over the TP account for a larger fraction than MCSs,indicating the important role of IDCs over the region.展开更多
The Second Tibetan Plateau Scientific Expedition and Research Program tasked a research team with the“Investigation of the water vapor channel of the Yarlung Zsangbo Grand Canyon(INVC)”in the southeastern Tibetan Pl...The Second Tibetan Plateau Scientific Expedition and Research Program tasked a research team with the“Investigation of the water vapor channel of the Yarlung Zsangbo Grand Canyon(INVC)”in the southeastern Tibetan Plateau(TP).This paper summarizes the scientific achievements obtained from the data collected by the INVC observation network and highlights the progress in investigating the development of heavy rainfall events associated with water vapor changes.The rain gauge network of the INVC can represent the impacts of the Yarlung Zsangbo Grand Canyon(YGC)topography on precipitation at the hourly scale.The microphysical characteristics of the precipitation in the YGC are different than those in the lowland area.The GPM-IMERG(Integrated MultisatellitE Retrievals for Global Precipitation Measurement)satellite precipitation data for the YGC region should be calibrated before they are used.The meridional water vapor flux through the YGC is more important than the zonal flux for the precipitation over the southeastern TP.The decreased precipitation around the YGC region is partly due to the decreased meridional water vapor flux passing through the YGC.High-resolution numerical models can benefit precipitation forecasting in this region by using a combination of specific schemes that capture the valley wind and water vapor flux along the valley floor.展开更多
Extreme snowfall events over the Tibetan Plateau(TP)cause considerable damage to local society and natural ecosystems.In this study,the authors investigate the projected changes in such events over the TP and its surr...Extreme snowfall events over the Tibetan Plateau(TP)cause considerable damage to local society and natural ecosystems.In this study,the authors investigate the projected changes in such events over the TP and its surrounding areas based on an ensemble of a set of 21st century climate change projections using a regional climate model,RegCM4.The model is driven by five CMIP5 global climate models at a grid spacing of 25 km,under the RCP4.5 and RCP8.5 pathways.Four modified ETCCDI extreme indices-namely,SNOWTOT,S1mm,S10mm,and Sx5day-are employed to characterize the extreme snowfall events.RegCM4 generally reproduces the spatial distribution of the indices over the region,although with a tendency of overestimation.For the projected changes,a general decrease in SNOWTOT is found over most of the TP,with greater magnitude and better cross-simulation agreement over the eastern part.All the simulations project an overall decrease in S1mm,ranging from a 25%decrease in the west and to a 50%decrease in the east of the TP.Both S10mm and Sx5day are projected to decrease over the eastern part and increase over the central and western parts of the TP.Notably,S10mm shows a marked increase(more than double)with high cross-simulation agreement over the central TP.Significant increases in all four indices are found over the Tarim and Qaidam basins,and northwestern China north of the TP.The projected changes show topographic dependence over the TP in the latitudinal direction,and tend to decrease/increase in low-/high-altitude areas.展开更多
The Yellow River Basin(YRB)has experienced severe floods and continuous riverbed elevation throughout history.Global climate change has been suggested to be driving a worldwide increase in flooding risk.However,owing ...The Yellow River Basin(YRB)has experienced severe floods and continuous riverbed elevation throughout history.Global climate change has been suggested to be driving a worldwide increase in flooding risk.However,owing to insufficient evidence,the quantitative correlation between flooding and climate change remains illdefined.We present a long time series of maximum flood discharge in the YRB dating back to 1843 compiled from historical documents and instrument measurements.Variations in yearly maximum flood discharge show distinct periods:a dramatic decreasing period from 1843 to 1950,and an oscillating gentle decreasing from 1950 to 2021,with the latter period also showing increasing more extreme floods.A Mann-Kendall test analysis suggests that the latter period can be further split into two distinct sub-periods:an oscillating gentle decreasing period from 1950 to 2000,and a clear recent increasing period from 2000 to 2021.We further predict that climate change will cause an ongoing remarkable increase in future flooding risk and an∼44.4 billion US dollars loss of floods in the YRB in 2100.展开更多
The relationship between support and surrounding rock is of great significance to the control of surrounding rock in mining process.In view of the fact that most of the existing numerical simulation methods construct ...The relationship between support and surrounding rock is of great significance to the control of surrounding rock in mining process.In view of the fact that most of the existing numerical simulation methods construct virtual elements and stress servo control to approximately replace the hydraulic support problem,this paper establishes a new numerical model of hydraulic support with the same working characteristics as the actual hydraulic support by integrating numerical simulation software Rhino,Griddle and FLAC3D,which can realize the simulation of different working conditions.Based on this model,the influence mechanism of the supporting strength of hydraulic support on surrounding rock stress regulation and coal stability in front of the top coal caving face in extra thick coal seam were researched.Firstly,under different support intensity,the abutment pressure of the bearing coal and the coal in front of it presents the “three-stage”evolution characteristics.The influence range of support intensity is 15%–30%.Secondly,1.5 MPa is the upper limit of impact that the support strength can have on the front coal failure area.Thirdly,within a displacement range of 2.76 m from the coal wall,a support strength of1.5 MPa provides optimal control of the horizontal displacement of the coal.展开更多
Deep coal seams show low permeability,low elastic modulus,high Poisson’s ratio,strong plasticity,high fracture initiation pressure,difficulty in fracture extension,and difficulty in proppants addition.We proposed the...Deep coal seams show low permeability,low elastic modulus,high Poisson’s ratio,strong plasticity,high fracture initiation pressure,difficulty in fracture extension,and difficulty in proppants addition.We proposed the concept of large-scale stimulation by fracture network,balanced propagation and effective support of fracture network in fracturing design and developed the extreme massive hydraulic fracturing technique for deep coalbed methane(CBM)horizontal wells.This technique involves massive injection with high pumping rate+high-intensity proppant injection+perforation with equal apertures and limited flow+temporary plugging and diverting fractures+slick water with integrated variable viscosity+graded proppants with multiple sizes.The technique was applied in the pioneering test of a multi-stage fracturing horizontal well in deep CBM of Linxing Block,eastern margin of the Ordos Basin.The injection flow rate is 18 m^(3)/min,proppant intensity is 2.1 m^(3)/m,and fracturing fluid intensity is 16.5 m^(3)/m.After fracturing,a complex fracture network was formed,with an average fracture length of 205 m.The stimulated reservoir volume was 1987×10^(4)m^(3),and the peak gas production rate reached 6.0×10^(4)m^(3)/d,which achieved efficient development of deep CBM.展开更多
基金This work was supported by the grant“Development of models,algorithms for semantic analysis to identify extremist content in web resources and creation the tool for cyber forensics”funded by the Ministry of Digital Development,Innovations and Aerospace industry of the Republic of Kazakhstan.Grant No.IRN AP06851248.Supervisor of the project is Shynar Mussiraliyeva,email:mussiraliyevash@gmail.com.
文摘In this research paper,we propose a corpus for the task of detecting religious extremism in social networks and open sources and compare various machine learning algorithms for the binary classification problem using a previously created corpus,thereby checking whether it is possible to detect extremist messages in the Kazakh language.To do this,the authors trained models using six classic machine-learning algorithms such as Support Vector Machine,Decision Tree,Random Forest,K Nearest Neighbors,Naive Bayes,and Logistic Regression.To increase the accuracy of detecting extremist texts,we used various characteristics such as Statistical Features,TF-IDF,POS,LIWC,and applied oversampling and undersampling techniques to handle imbalanced data.As a result,we achieved 98%accuracy in detecting religious extremism in Kazakh texts for the collected dataset.Testing the developed machine learningmodels in various databases that are often found in everyday life“Jokes”,“News”,“Toxic content”,“Spam”,“Advertising”has also shown high rates of extremism detection.
文摘Since the first years of independence,Uzbekistan began to develop and implement a policy of countering religious extremism and addressing the ideological basis of terrorism.Taking into consideration the complexity of this problem,Uzbekistan is comprehensively combating expressions of extremism and terrorism.
文摘This paper illuminates some of the main effects that neoliberalism has on the psychological and socio-economic profile of Americans.It outlines the structural processes that produced the groundwork for today’s enormous popularity of right-wing extremism in the USA.America’s middle-class has turned right-wing extremist during the Trump years and this trend has continued to dominate American politics today.While populism mobilizes feelings of injustice and grievances,the source and commencement of these grievances is the centerpiece of this article.The paper does so by applying Rodrigo Nunes’(2020a)analysis of the effects of Bolsenarismo in Brazil to the American society.The paper differentiates between the effects of individualism,punitivism,and the valorization of order above the law and shows how these trends have influenced preponderant identity traits of Baby Boomers and Generation X.Secondly,the paper focuses on the concept of“negative solidarity”which is one direct consequence of the worldview produced by successful indoctrination of neoliberal values and goes hand in hand with the consequent pauperization of the American worker.The preponderance of negative solidarity remains a key handicap for a democratic future and for any social mobilization efforts within the USA.
文摘March 2019 Contents Foreword I.Xinjiang Has Long Been an Inseparable Part of Chinese Territory II.The Origin of Terrorism and Extremism in Xinjiang III.Violent Terrorism and Religious Extremism Are Grave Abuses of Human Rights IV.Striking at Terrorism and Extremism in Accordance with the Law V.Giving Top Priority to a Preventive Counterterrorism Approach VI.Finding Experience for Counterterrorism and De-radicalization VII.
文摘In the context of globalization, violent extremist forces pose a serious threat to the fundamental human rights of the people all over the world. Strengthening human rights protection requires reinforcing the momentum to crack down and prevent the violent acts of extremist forces. As one of the countries that is the victim of violence by extremists, China has taken a series of measures to tackle the challenges of violent extremism. As President Xi Jinping has pointed out, 'the realization of the full enjoyment of human rights by human beings is the common goal of human society.' While establishing a community of common destiny for all mankind, the international community should take action to effectively address the root causes of violent extremism, maintain a peaceful and secure development environment, and defend the basic human rights and well-being of all peoples, so as to ensure a safe and brighter future for all.
文摘For today＇s human rights protection, it is requisite to firmly oppose religious ex- tremism, no matter whether in China or worldwide. Religious extremism is a rather serious phenomenon in the political life of today＇s world. In the form of religion （including banners, words, symbols and costumes, etc）, it agitates for the extreme claims and fanatical behavior of certain groups and damages social stability, so that it can serve its villainous purposes.
文摘After the collapse of the Mubarak regime,the activities of Islamic extremism organisations in Egypt have been frequent,which brought great challenges to national security and social stability.After Sisi came into power,the Egyptian government took various measures to actively promote the de-extremism work,however,the difficulties in the process of Egypt’s de-extremism cannot be ignored.Whether the transition of de-extremism from a movement to a institution can be realised will be the key to its longterm effect.
文摘In this paper,I examine the Twitter accounts of right-wing extremist groups(RWEGs)in India,arguing that the abjectification of Muslim masculinities is central to the narratives of Hindu supremacist groups.The abjectification process on Twitter serves as a rhetorical device to:a)criticize and problematize Muslim masculinities;b)idealize and glorify Hindu and white masculinities;c)promote Hindu and white masculine nationalist projects;and d)unify Hindu supremacists against Muslim others.By analyzing the gender ideologies expressed implicitly or explicitly on the Twitter accounts of RWEGs,and using the“Love Jihad”conspiracy case as a focal point,I demonstrate how the abjectification of Muslim masculinities is constructed in opposition to the idealized Hindu masculinities.This study highlights the intersection of gender and nationalism in the digital discourse of Hindu supremacist groups,offering insights into the mechanisms through which social media platforms are used to reinforce and propagate Islamophobic ideologies.
文摘While the fall of Raqqa signalled the steady decline and“defeat”of the Islamic State(IS),it did not guarantee the end of its ideology of violent extremism.The possibility of the organisation reinventing itself in different and perhaps more lethal ways is very high.States,therefore,must adopt measures that are based on holistic,multi-stakeholder approaches rather than on military and securitised responses to counter and ultimately prevent the spread of violent extremist ideology.The countries of the Gulf have the advantage of a“youth bulge,”with almost half its population under the age of 30 years.This“youth bulge”is however a double-edged sword.This large pool of human capital could be a demographic dividend,if harnessed intelligently,while conversely it could prove to be a demographic disaster if timely and plausible solutions to the various issues faced are not provided.This paper will explore ways in which preventing and countering violent extremism(P/CVE)through education could be achieved by including a variety of stakeholders from faith based organisations,the corporate sector,media and academia in the formulation of appropriate educational responses which take into account issues like culture,identity and religiosity.These re-education programmes should form an integral part of P/CVE policies,thereby providing the much needed psycho-social angle to an otherwise hard security-driven discourse.It is against this rationale that this paper makes a case for P/CVE through education,encompassing the formal,informal and non-formal levels,as one of the possible means for promoting and fostering a peace process in the Gulf.
基金financially supported by the National Key R&D Program of China (No.2021YFB3700400)the National Natural Science Foundation of China (Nos.52074030,51904021,and 52174294)。
文摘A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isothermal experiments. As a result of the competitive diffusion of alloying elements, the oxide scale included an outermost porous oxide layer (OOL), an inner relatively dense oxide layer (IOL), and an internal oxide zone (IOZ), depending on the temperature and time. A high temperature led to the formation of large voids at the IOL/IOZ interface. At 1200℃, the continuity of the Cr-rich oxide layer in the IOL was destroyed, and thus, spallation occurred. Extension of oxidation time contributed to the size of Al-rich oxide particles with the increase in the IOZ. Based on this finding,the oxidation kinetics of GH4738 was discussed, and the corresponding oxidation behavior at 900-1100℃ was predicted.
文摘Heavy precipitation and extreme drought have caused severe economic losses over South China and Indochina(INCSC)in recent decades.Given the areas with large gross domestic product(GDP)in the INCSC region are distributed along the coastline and greatly affected by global warming,understanding the possible economic impacts induced by future changes in the maximum consecutive 5-day precipitation(RX5day)and the maximum consecutive dry days(CDD)is critical for adaptation planning in this region.Based on the latest data released by phase 6 of the Coupled Model Intercomparison Project(CMIP6),future projections of precipitation extremes with bias correction and their impacts on GDP over the INCSC region under the fossil-fueled development Shared Socioeconomic Pathway(SSP5-8.5)are investigated.Results indicate that RX5day will intensify robustly throughout the INCSC region,while CDD will lengthen in most regions under global warming.The changes in climate consistently dominate the effect on GDP over the INCSC region,rather than the change of GDP.If only considering the effect of climate change on GDP,the changes in precipitation extremes bring a larger impact on the economy in the future to the provinces of Hunan,Jiangxi,Fujian,Guangdong,and Hainan in South China,as well as the Malay Peninsula and southern Cambodia in Indochina.Thus,timely regional adaptation strategies are urgent for these regions.Moreover,from the sub-regional average viewpoint,over two thirds of CMIP6 models agree that maintaining a lower global warming level will reduce the economic impacts from heavy precipitation over the INCSC region.
基金supported in part by the Sichuan Science and Technology Program(Grant No.2023YFG0316)the Industry-University Research Innovation Fund of China University(Grant No.2021ITA10016)+1 种基金the Key Scientific Research Fund of Xihua University(Grant No.Z1320929)the Special Funds of Industry Development of Sichuan Province(Grant No.zyf-2018-056).
文摘Due to the interdependency of frame synchronization(FS)and channel estimation(CE),joint FS and CE(JFSCE)schemes are proposed to enhance their functionalities and therefore boost the overall performance of wireless communication systems.Although traditional JFSCE schemes alleviate the influence between FS and CE,they show deficiencies in dealing with hardware imperfection(HI)and deterministic line-of-sight(LOS)path.To tackle this challenge,we proposed a cascaded ELM-based JFSCE to alleviate the influence of HI in the scenario of the Rician fading channel.Specifically,the conventional JFSCE method is first employed to extract the initial features,and thus forms the non-Neural Network(NN)solutions for FS and CE,respectively.Then,the ELMbased networks,named FS-NET and CE-NET,are cascaded to capture the NN solutions of FS and CE.Simulation and analysis results show that,compared with the conventional JFSCE methods,the proposed cascaded ELM-based JFSCE significantly reduces the error probability of FS and the normalized mean square error(NMSE)of CE,even against the impacts of parameter variations.
基金supported by the National Natural Science Foundation of China[grant number 42105064]the Second Tibetan Plateau Scientific Expedition and Research(STEP)program[grant number 2019QZKK0102]the special fund of the Yunnan University“double first-class”construction.
文摘The Tibetan Plateau(TP)is a prevalent region for convection systems due to its unique thermodynamic forcing.This study investigated isolated deep convections(IDCs),which have a smaller spatial and temporal size than mesoscale convective systems(MCSs),over the TP in the rainy season(June-September)during 2001–2020.The authors used satellite precipitation and brightness temperature observations from the Global Precipitation Measurement mission.Results show that IDCs mainly concentrate over the southern TP.The IDC number per rainy season decreases from around 140 over the southern TP to around 10 over the northern TP,with an average 54.2.The initiation time of IDCs exhibits an obvious diurnal cycle,with the peak at 1400–1500 LST and the valley at 0900–1000 LST.Most IDCs last less than five hours and more than half appear for only one hour.IDCs generally have a cold cloud area of 7422.9 km^(2),containing a precipitation area of approximately 65%.The larger the IDC,the larger the fraction of intense precipitation it contains.IDCs contribute approximately 20%–30%to total precipitation and approximately 30%–40%to extreme precipitation over the TP,with a larger percentage in July and August than in June and September.In terms of spatial distribution,IDCs contribute more to both total precipitation and extreme precipitation over the TP compared to the surrounding plain regions.IDCs over the TP account for a larger fraction than MCSs,indicating the important role of IDCs over the region.
基金funded by the Second Tibetan Plateau Scientific Expedition and Research Program[grant numbers 2019QZKK0105 and 2019QZKK0103]the National Natural Science Foundation of China[grant number 41975009].
文摘The Second Tibetan Plateau Scientific Expedition and Research Program tasked a research team with the“Investigation of the water vapor channel of the Yarlung Zsangbo Grand Canyon(INVC)”in the southeastern Tibetan Plateau(TP).This paper summarizes the scientific achievements obtained from the data collected by the INVC observation network and highlights the progress in investigating the development of heavy rainfall events associated with water vapor changes.The rain gauge network of the INVC can represent the impacts of the Yarlung Zsangbo Grand Canyon(YGC)topography on precipitation at the hourly scale.The microphysical characteristics of the precipitation in the YGC are different than those in the lowland area.The GPM-IMERG(Integrated MultisatellitE Retrievals for Global Precipitation Measurement)satellite precipitation data for the YGC region should be calibrated before they are used.The meridional water vapor flux through the YGC is more important than the zonal flux for the precipitation over the southeastern TP.The decreased precipitation around the YGC region is partly due to the decreased meridional water vapor flux passing through the YGC.High-resolution numerical models can benefit precipitation forecasting in this region by using a combination of specific schemes that capture the valley wind and water vapor flux along the valley floor.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences[grant number XDA2006040102]the National Natural Science Foundation of China[grant number 42175037].
文摘Extreme snowfall events over the Tibetan Plateau(TP)cause considerable damage to local society and natural ecosystems.In this study,the authors investigate the projected changes in such events over the TP and its surrounding areas based on an ensemble of a set of 21st century climate change projections using a regional climate model,RegCM4.The model is driven by five CMIP5 global climate models at a grid spacing of 25 km,under the RCP4.5 and RCP8.5 pathways.Four modified ETCCDI extreme indices-namely,SNOWTOT,S1mm,S10mm,and Sx5day-are employed to characterize the extreme snowfall events.RegCM4 generally reproduces the spatial distribution of the indices over the region,although with a tendency of overestimation.For the projected changes,a general decrease in SNOWTOT is found over most of the TP,with greater magnitude and better cross-simulation agreement over the eastern part.All the simulations project an overall decrease in S1mm,ranging from a 25%decrease in the west and to a 50%decrease in the east of the TP.Both S10mm and Sx5day are projected to decrease over the eastern part and increase over the central and western parts of the TP.Notably,S10mm shows a marked increase(more than double)with high cross-simulation agreement over the central TP.Significant increases in all four indices are found over the Tarim and Qaidam basins,and northwestern China north of the TP.The projected changes show topographic dependence over the TP in the latitudinal direction,and tend to decrease/increase in low-/high-altitude areas.
基金the National Natural Science Foundation of China(Grants No.42041006,41790443 and 41927806).
文摘The Yellow River Basin(YRB)has experienced severe floods and continuous riverbed elevation throughout history.Global climate change has been suggested to be driving a worldwide increase in flooding risk.However,owing to insufficient evidence,the quantitative correlation between flooding and climate change remains illdefined.We present a long time series of maximum flood discharge in the YRB dating back to 1843 compiled from historical documents and instrument measurements.Variations in yearly maximum flood discharge show distinct periods:a dramatic decreasing period from 1843 to 1950,and an oscillating gentle decreasing from 1950 to 2021,with the latter period also showing increasing more extreme floods.A Mann-Kendall test analysis suggests that the latter period can be further split into two distinct sub-periods:an oscillating gentle decreasing period from 1950 to 2000,and a clear recent increasing period from 2000 to 2021.We further predict that climate change will cause an ongoing remarkable increase in future flooding risk and an∼44.4 billion US dollars loss of floods in the YRB in 2100.
基金supported by Distinguished Youth Funds of National Natural Science Foundation of China (No.51925402)National Natural Science Foundation of China (Nos.51904203 and 52174125)+4 种基金the China Postdoctoral Science Foundation (No.2021M702049)the Tencent Foundation or XPLORER PRIZEShanxi Science and Technology Major Project Funds (No.20201102004)Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering (No.2021SX-TD001)Open Fund Research Project Supported by State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology (No.SICGM202209)。
文摘The relationship between support and surrounding rock is of great significance to the control of surrounding rock in mining process.In view of the fact that most of the existing numerical simulation methods construct virtual elements and stress servo control to approximately replace the hydraulic support problem,this paper establishes a new numerical model of hydraulic support with the same working characteristics as the actual hydraulic support by integrating numerical simulation software Rhino,Griddle and FLAC3D,which can realize the simulation of different working conditions.Based on this model,the influence mechanism of the supporting strength of hydraulic support on surrounding rock stress regulation and coal stability in front of the top coal caving face in extra thick coal seam were researched.Firstly,under different support intensity,the abutment pressure of the bearing coal and the coal in front of it presents the “three-stage”evolution characteristics.The influence range of support intensity is 15%–30%.Secondly,1.5 MPa is the upper limit of impact that the support strength can have on the front coal failure area.Thirdly,within a displacement range of 2.76 m from the coal wall,a support strength of1.5 MPa provides optimal control of the horizontal displacement of the coal.
基金Supported by the National Natural Science Foundation of China Project(52274014)Comprehensive Scientific Research Project of China National Offshore Oil Corporation(KJZH-2023-2303)。
文摘Deep coal seams show low permeability,low elastic modulus,high Poisson’s ratio,strong plasticity,high fracture initiation pressure,difficulty in fracture extension,and difficulty in proppants addition.We proposed the concept of large-scale stimulation by fracture network,balanced propagation and effective support of fracture network in fracturing design and developed the extreme massive hydraulic fracturing technique for deep coalbed methane(CBM)horizontal wells.This technique involves massive injection with high pumping rate+high-intensity proppant injection+perforation with equal apertures and limited flow+temporary plugging and diverting fractures+slick water with integrated variable viscosity+graded proppants with multiple sizes.The technique was applied in the pioneering test of a multi-stage fracturing horizontal well in deep CBM of Linxing Block,eastern margin of the Ordos Basin.The injection flow rate is 18 m^(3)/min,proppant intensity is 2.1 m^(3)/m,and fracturing fluid intensity is 16.5 m^(3)/m.After fracturing,a complex fracture network was formed,with an average fracture length of 205 m.The stimulated reservoir volume was 1987×10^(4)m^(3),and the peak gas production rate reached 6.0×10^(4)m^(3)/d,which achieved efficient development of deep CBM.
