Developmental and epileptic encephalopathies(DEEs)are neurological disorders generally involving medically intractable seizures and a diverse array of comorbid neuropsychiatric delays and deficits that may severely af...Developmental and epileptic encephalopathies(DEEs)are neurological disorders generally involving medically intractable seizures and a diverse array of comorbid neuropsychiatric delays and deficits that may severely affect cognition,mood,sleep,social behavior,movement control,learning,and/or memory.Dravet syndrome(DS),also known as Severe Myoclonic Epilepsy of Infancy.展开更多
Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was constructed via radical polymerization,sol-gel transition and supercritical CO_(2)drying.The fabricated organic-inorganic hybrid PVTMS@MWCNT...Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was constructed via radical polymerization,sol-gel transition and supercritical CO_(2)drying.The fabricated organic-inorganic hybrid PVTMS@MWCNT aerogel structure shows nano-pore size(30-40 nm),high specific surface area(559 m^(2)g^(−1)),high void fraction(91.7%)and enhanced mechanical property:(1)the nano-pore size is beneficial for efficiently blocking thermal conduction and thermal convection via Knudsen effect(beneficial for infrared(IR)stealth);(2)the heterogeneous interface was beneficial for IR reflection(beneficial for IR stealth)and MWCNT polarization loss(beneficial for electromagnetic wave(EMW)attenuation);(3)the high void fraction was beneficial for enhancing thermal insulation(beneficial for IR stealth)and EMW impedance match(beneficial for EMW attenuation).Guided by the above theoretical design strategy,PVTMS@MWCNT nano-aerogel shows superior EMW absorption property(cover all Ku-band)and thermal IR stealth property(ΔT reached 60.7℃).Followed by a facial combination of the above nano-aerogel with graphene film of high electrical conductivity,an extremely high electromagnetic interference shielding material(66.5 dB,2.06 mm thickness)with superior absorption performance of an average absorption-to-reflection(A/R)coefficient ratio of 25.4 and a low reflection bandwidth of 4.1 GHz(A/R ratio more than 10)was experimentally obtained in this work.展开更多
On September 10 after the G20 Summit in New Dehli,U.S.President Joe Biden traveled by Air Force One to Hanoi,Vietnam,for a state visit.There,he met with Nguyen Phu Trong,general secretary of the Communist Party of Vie...On September 10 after the G20 Summit in New Dehli,U.S.President Joe Biden traveled by Air Force One to Hanoi,Vietnam,for a state visit.There,he met with Nguyen Phu Trong,general secretary of the Communist Party of Vietnam(CPV)Central Committee,and other senior state leaders to exchange views on how to deepen cooperation between the two countries.展开更多
Cu(NO3)(2) and (NH4)(6)H(2)W(12)O(40)center dot 4H(2)O were used to prepare W/Cu nanosized composite powder by sol-gel technique. The influences of heat treatment process, pH value of the solution and the amount of an...Cu(NO3)(2) and (NH4)(6)H(2)W(12)O(40)center dot 4H(2)O were used to prepare W/Cu nanosized composite powder by sol-gel technique. The influences of heat treatment process, pH value of the solution and the amount of an addition agent on particle size were investigated by DSC, XRD and TEM. The results show that, at a certain heat treatment temperature, the W/Cu nanoparticle size increases with the pH value or the amount of the addition agent increasing.展开更多
Chemical solution deposited CdSe particulate film possess nanocrystalline structure and exhibit quantum size effects. By changing the temperature of chemical deposition and subsequent annealing, CdSe particulate films...Chemical solution deposited CdSe particulate film possess nanocrystalline structure and exhibit quantum size effects. By changing the temperature of chemical deposition and subsequent annealing, CdSe particulate films with different particle sizes can be obtained.展开更多
An anomalous dielectric behavior in nanometer-sized amocthous silicon nitride is reported. The dielectric constant of nanometer-sized ajnorph. silicon nitride has strong dependence on frequency at room temperature (RT...An anomalous dielectric behavior in nanometer-sized amocthous silicon nitride is reported. The dielectric constant of nanometer-sized ajnorph. silicon nitride has strong dependence on frequency at room temperature (RT),which is completely different from the conventional coarse-grain silicon nitride. The maximum of the dielectric constant of nanometer-sized amorphous silicon nitride at KT is about 40 times larger than that of the conventional silicon nitride. The anomalous dielectric behavior is explained by a kind of mech&nism of pola.rizationt that is, interfacial polarization.展开更多
We report high-resolution scanning tunneling microscopy(STM)study of nano-sized Pb islands grown on SrTiO3,where three distinct types of gaps with different energy scales are revealed.At low temperature,we find that t...We report high-resolution scanning tunneling microscopy(STM)study of nano-sized Pb islands grown on SrTiO3,where three distinct types of gaps with different energy scales are revealed.At low temperature,we find that the superconducting gap(△s)in nano-sized Pb islands is significantly enhanced from the one in bulk Pb,while there is no essential change in superconducting transition temperature Tc,giving rise to a larger BCS ratio 2△s/kBTc^8.31 and implying stronger electron-phonon coupling.The stronger coupling can originate from the interface electron-phonon interactions between Pb islands and SrTiO3.As the superconducting gap is totally suppressed under applied magnetic field,the Coulomb gap with apparent V-shape emerges.Moreover,the size of Coulomb gap(Ac)depends on the lateral size of Pb islands(R)with △c-1/R^035,indicating that quantum size effect can significantly influence electronic correlations.Our experimental results shall shed important light on the interplay among superconductivity,quantum size effect and correlations in nano-sized strong-coupling superconductors.展开更多
On the basis of analyzing the reliability of the organization’ management chain of the large and medium- sized project in the construction period, the paper studies the factors influencing the reliability of the orga...On the basis of analyzing the reliability of the organization’ management chain of the large and medium- sized project in the construction period, the paper studies the factors influencing the reliability of the organi-zation management chain, which, corresponding to four elements of management chain – “Management Loop”, “Management Link”, “Management Chain”, and “Management Network”, can be summarized as project main body, interface management, connection sequence and management model. The paper then re-searches on the specific influencing factors from the above-mentioned four aspects.展开更多
The inhibitory effect of phosphate on the crystal grain growth of nanosized titania during high temperature calcination was investigated. Nanosized titanium dioxide powders prepared by hydrolysis of titanium tetrachlo...The inhibitory effect of phosphate on the crystal grain growth of nanosized titania during high temperature calcination was investigated. Nanosized titanium dioxide powders prepared by hydrolysis of titanium tetrachloride were soaked in phosphate solutions with different concentrations. The obtained powders calcined at various temperatures were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectronic spectroscopy (XPS). The grain size of the samples without phosphate treatment increased quickly when calcined at high temperatures, while the grain size of the samples with phosphate modification increased slowly when calcined at the same temperature. This phenomenon implies that phosphate treatment plays an important role in inhibiting the crystal grain growth of titania. The possible mechanism of the inhibition effect of phosphate on titania is discussed.展开更多
In the context of government appeal of " mass entrepreneurship and innovation",all areas launched the movement of " mass entrepreneurship" and " grassroots entrepreneurship". As parts of ...In the context of government appeal of " mass entrepreneurship and innovation",all areas launched the movement of " mass entrepreneurship" and " grassroots entrepreneurship". As parts of vitality of China's market economy,small and medium sized private enterprises become grassroots of market competition in talents,funds,and technologies. This paper combined three levels of entrepreneurial spirit and small and medium sized private enterprises,studied acting mechanism of entrepreneurial spirit,discussed competitive power of small and medium sized private enterprises,and recommended that small and medium sized private enterprises should cultivate core competitive power,adapt to external environment,and create external environment support,to realize sound development.展开更多
Scanning tunneling microscopy was used to observe the morphological feature of luminescent porous Si Results show that the surface of porous Si consists of randomly distributed nano-sized Si grains,which may be Si clu...Scanning tunneling microscopy was used to observe the morphological feature of luminescent porous Si Results show that the surface of porous Si consists of randomly distributed nano-sized Si grains,which may be Si clusters.No clear interface was found between the grains.Its microstructure looks like a sponge.Visible photoluminescence in porous Si is most likely due to the carrier confinement in this microstructure.展开更多
The microporous nanocry'sta1line TiO2 electrode with large surface roughness factor hasbeen prepared on a conducting glass support. Modification of the TiO2 electrode by in situ preparingquantum sized RuS2 particl...The microporous nanocry'sta1line TiO2 electrode with large surface roughness factor hasbeen prepared on a conducting glass support. Modification of the TiO2 electrode by in situ preparingquantum sized RuS2 particles on the surface of TiO2 electrode extends the optical absorptionspectrum and photocurrent action specmim into visible region. In addition, compared with RuS2 bulknlaterials- a blue shifi in both absorption spectrum and photocurrent action speCtrum of RuS2rriO2elcctrode is obserived and explained in terms of quantum sized effect.展开更多
Recently, four coexisted titanosaurs from latest Maastrichtian Vitakri Lameta Formation of Indo-Pakistan are recognized as Isisaurus and Pakisaurus of large-sized slender pakisaurids, Saraikimasoom and Gspsaurus of th...Recently, four coexisted titanosaurs from latest Maastrichtian Vitakri Lameta Formation of Indo-Pakistan are recognized as Isisaurus and Pakisaurus of large-sized slender pakisaurids, Saraikimasoom and Gspsaurus of the smallest and medium sized transversely stocky gspsaurids. Gspsaurus pakistani based on associated skull (with conical teeth tapering gradually from base to tip), vertebral and appendicular elements found from Alam 19 locality of Vitakri area, Barkhan district, Balochistan, Pakistan, South Asia. Gspsaurus bears sufficient skeletal elements and can be used for evolutionary studies.展开更多
On September 2,2021,general secretary Xi Jinping announced in his speech at the China International Fair for Trade in Services—Global Services Trade Summit,that the State will continue to support innovation and devel...On September 2,2021,general secretary Xi Jinping announced in his speech at the China International Fair for Trade in Services—Global Services Trade Summit,that the State will continue to support innovation and development of small-and medium-sized enterprises,deepen the reform of the National Equities Exchange and Quotations(NEEQ) and set up the Beijing Stock Exchange to build a main camp for serving innovative small-and medium-sized enterprises.展开更多
The coronavirus outbreak has posed unprecedented challenges for small and micro enterprises,and in response this year’s government work report mentioned support for small and micro enterprises six times.Recently,the ...The coronavirus outbreak has posed unprecedented challenges for small and micro enterprises,and in response this year’s government work report mentioned support for small and micro enterprises six times.Recently,the person responsible at the National Reform and Development Commission said at the press conference of the State Council Information Office that it is important to work hard to ensure the stability of the industry chain and supply chain.A trend of anti-globalization has brought challenges to the supply chain in many sectors which will affect a lot of small and micro enterprises along the industrial and supply chains.How to save these companies out of this predicament?展开更多
China’s small and medium-sized private enterprises plays a very important role in the process of development of the national economy in, to the development of the national economy also plays a vital role, but with th...China’s small and medium-sized private enterprises plays a very important role in the process of development of the national economy in, to the development of the national economy also plays a vital role, but with the development of the times, small and medium-sized private enterprises funds, technology, personnel and other contradictions have become increasingly prominent. China’s small and medium-sized private enterprises to want to, in the face of intense competition today, seeking a seat on the development, dredge fi nancing channel is the most important, he can affect the enterprise production and management, foreign investment and the adjustment of the capital structure. So properly solve the enterprise fi nancing problems is of great signifi cance. Henan Province as a new rising big province, its economic potential without limit, in this paper, based on the fi nancing situation of small and medium-sized private enterprises in Henan Province and fi nancing diffi cult problem of, and combined with related literature, to explain its existing problems and analysis to explore the related reasons, the proposed for solving measures.展开更多
1.IntroductionWith the increasing of turbo-generator (TG) capacity,the limi-tation on the abnormal frequency operation is growing more restric-tive.In order to ensure the safety operation of certain TG unit,splitingde...1.IntroductionWith the increasing of turbo-generator (TG) capacity,the limi-tation on the abnormal frequency operation is growing more restric-tive.In order to ensure the safety operation of certain TG unit,splitingdevice which isolates the generating unit from the system is em-ployed when the system frequency is declined to a certain extent.However,during the degradation of frequency,to isolate the large-sized TG unit from the power system will cause the system fre-quency to further decline.Hence,how to use the low frequency split-ting protection properly and how to coordinate the operation of underfrequency load shedding (UFLS) with under frequency generatorsplitting (UFGS) are significant for securing the safety operation展开更多
The long-awaited Regional Comprehensive Economic Partnership(RCEP)agreement was signed and witnessed by leaders of the 15 participating countries via a video ceremony on November 15,2020.“The free trade agreement[FTA...The long-awaited Regional Comprehensive Economic Partnership(RCEP)agreement was signed and witnessed by leaders of the 15 participating countries via a video ceremony on November 15,2020.“The free trade agreement[FTA]creates new partnerships between China and Japan as well as Japan and South Korea,and it will contribute greatly to trade facilitation within the region,”said Chinese Vice Commerce Minister Wang Shouwen.展开更多
Recently,the local cotton spot price in Yancheng,Jiangsu has risen slightly,and the price of yarn is also increasing slightly.Therefore,the production and operation of most small and medium-sized textile enterprises i...Recently,the local cotton spot price in Yancheng,Jiangsu has risen slightly,and the price of yarn is also increasing slightly.Therefore,the production and operation of most small and medium-sized textile enterprises is improving.Despite this,quite a few of the interviewed companies do not have large inventories,and the purchase of raw materials and the delivery of finished products are all controlled within a small amount(the average raw cotton inventory is about 1 month,and the product inventory is controlled at about 10 days).It is reported that there are relatively many orders from small and medium-sized yarn mills and cloth mills in the coastal areas of Jiangsu and Zhejiang.They focus on how to complete the order tasks and order continuity with quality and quantity.展开更多
Carbon deposition during methanol to hydrocarbons leads to the quick deactivation of ZSM-5 catalyst and it is one of the major problems for this technology. Decreasing the crystal size or introducing mesopores into ZS...Carbon deposition during methanol to hydrocarbons leads to the quick deactivation of ZSM-5 catalyst and it is one of the major problems for this technology. Decreasing the crystal size or introducing mesopores into ZSM-5 zeolites can improve its diffusion property and decrease the coke formation. In this paper, nano-sized ZSM-5 zeolite with intercrystalline mesopores combining the mesoporous and nano sized structure was fabricated. For comparison, the mesoporous ZSM-5 and nano-sized ZSM-5 were also prepared. These catalyst samples were characterized by XRD, BET, NH3-TPD, TEM, Py-IR and TG techniques and used on the conversion of methanol to gasoline in a fixed-bed reactor at T=405 degrees C, WHSV =4.74 h(-1) and P=1.0 MPa. It was found that the external surface area of the nano-sized ZSM-5 zeolite with intercrystalline mesopores reached 104 m(2)/g, larger than that of mesoporous ZSM-5 (66 m(2)/g) and nano sized ZSM-5 (76 m(2)/g). Catalytic lifetime of the nano-sized ZSM-5 zeolite with intercrystalline mesopores was 93 h, which was only longer than that of mesoporous ZSM-5 (86 h), but shorter than that of nano sized ZSM-5 (104 h). Strong acidity promoted the coke formation and thus decreased the catalytic lifetime of the nano-sized ZSM-5 zeolite with intercrystalline mesopores though it presented large external surface that could improve the diffusion property. The special zeolite catalyst was further dealuminated to decrease the strong acidity. After this, its coke formation rate was slowed and catalytic lifetime was prolonged to 106 h because of the large external surface area and decreased weak acidity. This special structural zeolite is a potential catalyst for methanol to gasoline reaction. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.展开更多
基金supported by Dravet Syndrome Foundation,NIH/NINDS R01-NS112500.
文摘Developmental and epileptic encephalopathies(DEEs)are neurological disorders generally involving medically intractable seizures and a diverse array of comorbid neuropsychiatric delays and deficits that may severely affect cognition,mood,sleep,social behavior,movement control,learning,and/or memory.Dravet syndrome(DS),also known as Severe Myoclonic Epilepsy of Infancy.
基金the National Natural Science Foundation(No.52073187)NSAF Foundation(No.U2230202)for their financial support of this project+3 种基金National Natural Science Foundation(No.51721091)Programme of Introducing Talents of Discipline to Universities(No.B13040)State Key Laboratory of Polymer Materials Engineering(No.sklpme2022-2-03)support of China Scholarship Council
文摘Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was constructed via radical polymerization,sol-gel transition and supercritical CO_(2)drying.The fabricated organic-inorganic hybrid PVTMS@MWCNT aerogel structure shows nano-pore size(30-40 nm),high specific surface area(559 m^(2)g^(−1)),high void fraction(91.7%)and enhanced mechanical property:(1)the nano-pore size is beneficial for efficiently blocking thermal conduction and thermal convection via Knudsen effect(beneficial for infrared(IR)stealth);(2)the heterogeneous interface was beneficial for IR reflection(beneficial for IR stealth)and MWCNT polarization loss(beneficial for electromagnetic wave(EMW)attenuation);(3)the high void fraction was beneficial for enhancing thermal insulation(beneficial for IR stealth)and EMW impedance match(beneficial for EMW attenuation).Guided by the above theoretical design strategy,PVTMS@MWCNT nano-aerogel shows superior EMW absorption property(cover all Ku-band)and thermal IR stealth property(ΔT reached 60.7℃).Followed by a facial combination of the above nano-aerogel with graphene film of high electrical conductivity,an extremely high electromagnetic interference shielding material(66.5 dB,2.06 mm thickness)with superior absorption performance of an average absorption-to-reflection(A/R)coefficient ratio of 25.4 and a low reflection bandwidth of 4.1 GHz(A/R ratio more than 10)was experimentally obtained in this work.
文摘On September 10 after the G20 Summit in New Dehli,U.S.President Joe Biden traveled by Air Force One to Hanoi,Vietnam,for a state visit.There,he met with Nguyen Phu Trong,general secretary of the Communist Party of Vietnam(CPV)Central Committee,and other senior state leaders to exchange views on how to deepen cooperation between the two countries.
基金This Project was financially supported by the National Natural Science Foundation of China (No. 50471033).
文摘Cu(NO3)(2) and (NH4)(6)H(2)W(12)O(40)center dot 4H(2)O were used to prepare W/Cu nanosized composite powder by sol-gel technique. The influences of heat treatment process, pH value of the solution and the amount of an addition agent on particle size were investigated by DSC, XRD and TEM. The results show that, at a certain heat treatment temperature, the W/Cu nanoparticle size increases with the pH value or the amount of the addition agent increasing.
文摘Chemical solution deposited CdSe particulate film possess nanocrystalline structure and exhibit quantum size effects. By changing the temperature of chemical deposition and subsequent annealing, CdSe particulate films with different particle sizes can be obtained.
基金Supported by the National Natural Science Foundation of ChinaNational Advanced Material Committee of China.
文摘An anomalous dielectric behavior in nanometer-sized amocthous silicon nitride is reported. The dielectric constant of nanometer-sized ajnorph. silicon nitride has strong dependence on frequency at room temperature (RT),which is completely different from the conventional coarse-grain silicon nitride. The maximum of the dielectric constant of nanometer-sized amorphous silicon nitride at KT is about 40 times larger than that of the conventional silicon nitride. The anomalous dielectric behavior is explained by a kind of mech&nism of pola.rizationt that is, interfacial polarization.
基金the National Natural Science Foundation under Grant Nos.11674191 and 11825404the National Key Program for S&T Research and Development under Grant No No.2016YFA0301002the Beijing Advanced Innovation Center for Future Chip(ICFC).W.L.was also supported by Beijing Young Talents Plan.
文摘We report high-resolution scanning tunneling microscopy(STM)study of nano-sized Pb islands grown on SrTiO3,where three distinct types of gaps with different energy scales are revealed.At low temperature,we find that the superconducting gap(△s)in nano-sized Pb islands is significantly enhanced from the one in bulk Pb,while there is no essential change in superconducting transition temperature Tc,giving rise to a larger BCS ratio 2△s/kBTc^8.31 and implying stronger electron-phonon coupling.The stronger coupling can originate from the interface electron-phonon interactions between Pb islands and SrTiO3.As the superconducting gap is totally suppressed under applied magnetic field,the Coulomb gap with apparent V-shape emerges.Moreover,the size of Coulomb gap(Ac)depends on the lateral size of Pb islands(R)with △c-1/R^035,indicating that quantum size effect can significantly influence electronic correlations.Our experimental results shall shed important light on the interplay among superconductivity,quantum size effect and correlations in nano-sized strong-coupling superconductors.
文摘On the basis of analyzing the reliability of the organization’ management chain of the large and medium- sized project in the construction period, the paper studies the factors influencing the reliability of the organi-zation management chain, which, corresponding to four elements of management chain – “Management Loop”, “Management Link”, “Management Chain”, and “Management Network”, can be summarized as project main body, interface management, connection sequence and management model. The paper then re-searches on the specific influencing factors from the above-mentioned four aspects.
基金Support of the National Natural Science Foundation of China (No. 20671028)the Natural Science Foundation of Hebei Province (No. E2006000172)the Postdoctoral Science Foundation of China (No. 2005038511)
文摘The inhibitory effect of phosphate on the crystal grain growth of nanosized titania during high temperature calcination was investigated. Nanosized titanium dioxide powders prepared by hydrolysis of titanium tetrachloride were soaked in phosphate solutions with different concentrations. The obtained powders calcined at various temperatures were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectronic spectroscopy (XPS). The grain size of the samples without phosphate treatment increased quickly when calcined at high temperatures, while the grain size of the samples with phosphate modification increased slowly when calcined at the same temperature. This phenomenon implies that phosphate treatment plays an important role in inhibiting the crystal grain growth of titania. The possible mechanism of the inhibition effect of phosphate on titania is discussed.
基金Supported by Key Project of National Social Science Foundation(12xgl007)Fundamental Research Funds for the Central Universities in 2016(swu1609240)
文摘In the context of government appeal of " mass entrepreneurship and innovation",all areas launched the movement of " mass entrepreneurship" and " grassroots entrepreneurship". As parts of vitality of China's market economy,small and medium sized private enterprises become grassroots of market competition in talents,funds,and technologies. This paper combined three levels of entrepreneurial spirit and small and medium sized private enterprises,studied acting mechanism of entrepreneurial spirit,discussed competitive power of small and medium sized private enterprises,and recommended that small and medium sized private enterprises should cultivate core competitive power,adapt to external environment,and create external environment support,to realize sound development.
文摘Scanning tunneling microscopy was used to observe the morphological feature of luminescent porous Si Results show that the surface of porous Si consists of randomly distributed nano-sized Si grains,which may be Si clusters.No clear interface was found between the grains.Its microstructure looks like a sponge.Visible photoluminescence in porous Si is most likely due to the carrier confinement in this microstructure.
文摘The microporous nanocry'sta1line TiO2 electrode with large surface roughness factor hasbeen prepared on a conducting glass support. Modification of the TiO2 electrode by in situ preparingquantum sized RuS2 particles on the surface of TiO2 electrode extends the optical absorptionspectrum and photocurrent action specmim into visible region. In addition, compared with RuS2 bulknlaterials- a blue shifi in both absorption spectrum and photocurrent action speCtrum of RuS2rriO2elcctrode is obserived and explained in terms of quantum sized effect.
文摘Recently, four coexisted titanosaurs from latest Maastrichtian Vitakri Lameta Formation of Indo-Pakistan are recognized as Isisaurus and Pakisaurus of large-sized slender pakisaurids, Saraikimasoom and Gspsaurus of the smallest and medium sized transversely stocky gspsaurids. Gspsaurus pakistani based on associated skull (with conical teeth tapering gradually from base to tip), vertebral and appendicular elements found from Alam 19 locality of Vitakri area, Barkhan district, Balochistan, Pakistan, South Asia. Gspsaurus bears sufficient skeletal elements and can be used for evolutionary studies.
文摘On September 2,2021,general secretary Xi Jinping announced in his speech at the China International Fair for Trade in Services—Global Services Trade Summit,that the State will continue to support innovation and development of small-and medium-sized enterprises,deepen the reform of the National Equities Exchange and Quotations(NEEQ) and set up the Beijing Stock Exchange to build a main camp for serving innovative small-and medium-sized enterprises.
文摘The coronavirus outbreak has posed unprecedented challenges for small and micro enterprises,and in response this year’s government work report mentioned support for small and micro enterprises six times.Recently,the person responsible at the National Reform and Development Commission said at the press conference of the State Council Information Office that it is important to work hard to ensure the stability of the industry chain and supply chain.A trend of anti-globalization has brought challenges to the supply chain in many sectors which will affect a lot of small and micro enterprises along the industrial and supply chains.How to save these companies out of this predicament?
文摘China’s small and medium-sized private enterprises plays a very important role in the process of development of the national economy in, to the development of the national economy also plays a vital role, but with the development of the times, small and medium-sized private enterprises funds, technology, personnel and other contradictions have become increasingly prominent. China’s small and medium-sized private enterprises to want to, in the face of intense competition today, seeking a seat on the development, dredge fi nancing channel is the most important, he can affect the enterprise production and management, foreign investment and the adjustment of the capital structure. So properly solve the enterprise fi nancing problems is of great signifi cance. Henan Province as a new rising big province, its economic potential without limit, in this paper, based on the fi nancing situation of small and medium-sized private enterprises in Henan Province and fi nancing diffi cult problem of, and combined with related literature, to explain its existing problems and analysis to explore the related reasons, the proposed for solving measures.
文摘1.IntroductionWith the increasing of turbo-generator (TG) capacity,the limi-tation on the abnormal frequency operation is growing more restric-tive.In order to ensure the safety operation of certain TG unit,splitingdevice which isolates the generating unit from the system is em-ployed when the system frequency is declined to a certain extent.However,during the degradation of frequency,to isolate the large-sized TG unit from the power system will cause the system fre-quency to further decline.Hence,how to use the low frequency split-ting protection properly and how to coordinate the operation of underfrequency load shedding (UFLS) with under frequency generatorsplitting (UFGS) are significant for securing the safety operation
文摘The long-awaited Regional Comprehensive Economic Partnership(RCEP)agreement was signed and witnessed by leaders of the 15 participating countries via a video ceremony on November 15,2020.“The free trade agreement[FTA]creates new partnerships between China and Japan as well as Japan and South Korea,and it will contribute greatly to trade facilitation within the region,”said Chinese Vice Commerce Minister Wang Shouwen.
文摘Recently,the local cotton spot price in Yancheng,Jiangsu has risen slightly,and the price of yarn is also increasing slightly.Therefore,the production and operation of most small and medium-sized textile enterprises is improving.Despite this,quite a few of the interviewed companies do not have large inventories,and the purchase of raw materials and the delivery of finished products are all controlled within a small amount(the average raw cotton inventory is about 1 month,and the product inventory is controlled at about 10 days).It is reported that there are relatively many orders from small and medium-sized yarn mills and cloth mills in the coastal areas of Jiangsu and Zhejiang.They focus on how to complete the order tasks and order continuity with quality and quantity.
基金the Science and Technology Foundation Platform Construction Project of Shanxi Province(No.2015091009)the National Science Foundation for Young Scientists of China(No.21606160)+1 种基金the Qualified Personnel Foundation of Taiyuan University of Technology(No.tyut-rc201454a)School Fund of Taiyuan University of Technology(Nos.1205-04020202 and 1205-04020102)
文摘Carbon deposition during methanol to hydrocarbons leads to the quick deactivation of ZSM-5 catalyst and it is one of the major problems for this technology. Decreasing the crystal size or introducing mesopores into ZSM-5 zeolites can improve its diffusion property and decrease the coke formation. In this paper, nano-sized ZSM-5 zeolite with intercrystalline mesopores combining the mesoporous and nano sized structure was fabricated. For comparison, the mesoporous ZSM-5 and nano-sized ZSM-5 were also prepared. These catalyst samples were characterized by XRD, BET, NH3-TPD, TEM, Py-IR and TG techniques and used on the conversion of methanol to gasoline in a fixed-bed reactor at T=405 degrees C, WHSV =4.74 h(-1) and P=1.0 MPa. It was found that the external surface area of the nano-sized ZSM-5 zeolite with intercrystalline mesopores reached 104 m(2)/g, larger than that of mesoporous ZSM-5 (66 m(2)/g) and nano sized ZSM-5 (76 m(2)/g). Catalytic lifetime of the nano-sized ZSM-5 zeolite with intercrystalline mesopores was 93 h, which was only longer than that of mesoporous ZSM-5 (86 h), but shorter than that of nano sized ZSM-5 (104 h). Strong acidity promoted the coke formation and thus decreased the catalytic lifetime of the nano-sized ZSM-5 zeolite with intercrystalline mesopores though it presented large external surface that could improve the diffusion property. The special zeolite catalyst was further dealuminated to decrease the strong acidity. After this, its coke formation rate was slowed and catalytic lifetime was prolonged to 106 h because of the large external surface area and decreased weak acidity. This special structural zeolite is a potential catalyst for methanol to gasoline reaction. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.