NUMBERS OF THE WEEK"1】5"Total yields from insurance premium investment in 2007 reached 279.17 billion yuan($38.77 billion),exceeding the aggregate amount of the previous five years,according to Wu Dingfu, C...NUMBERS OF THE WEEK"1】5"Total yields from insurance premium investment in 2007 reached 279.17 billion yuan($38.77 billion),exceeding the aggregate amount of the previous five years,according to Wu Dingfu, Chairman of China Insurance Regulatory Commission.Wu said it was the best achievement ever for the insurance industry,and the 2007 premium totaled 703.58 billion yuan($97.72 billion), increasing 25 percent year on year. Beijing’s Vice Mayor Chen Gang said(?) total cost of Beijing Olympic venues would amount to 13 billion yuan($1.81(?)展开更多
Performance Stable at the Beginning of 2010 2010 is a crucial year as China strives to maintain rapid economic growth while reforming its growth model. The global situation will improve this
Textile industry this year will face more pressure Q1 Textile Industry’s Performance Conference was unveiled by China National Textile & Apparel Council on May 13.Since the beginning of 2011,the standard for defi...Textile industry this year will face more pressure Q1 Textile Industry’s Performance Conference was unveiled by China National Textile & Apparel Council on May 13.Since the beginning of 2011,the standard for defin ing large-scale enterprises was raised from the annual income of 5 million yuan of main business to the annual income of 20 million yuan of main business, according to the latest news.展开更多
Indeed,there is some evidence the government’s stimulus package is producing results.Investment of cotton textile industry shows recovery progress and production remains stable.
In this study,aerodynamic behaviors of swept and leaned blades were investigated.Axial and tangential blade curvatures impacts on compressor's operating parameters were analyzed separately.A commercial CFD program...In this study,aerodynamic behaviors of swept and leaned blades were investigated.Axial and tangential blade curvatures impacts on compressor's operating parameters were analyzed separately.A commercial CFD program which solves the Reynolds-averaged Navier-Stokes equations was used to find out the mentioned impact and the complicated flow field of transonic compressor-rotors.The CFD method that was used for solving flow field's equation was validated by experimental data of NASA Rotor 67.The results showed that the compressor with curved rotors had higher efficiency,rotor pressure ratio and stable operating range compared to the compressor with un-curved rotors.Using curved rotors mostly had higher impact on the overall stable operating range compared to the other operating parameters.Operating range involves choking point and stall point that were changed separately by using of bended blade.For finding the detailed impact of sweep and lean angle on transonic blades,various forms of lean and sweep angles were exerted to basic rotor.It was found that sweep angles increased overall operating range up to 30%,efficiency up to 2%and pressure ratio up to 1%.Leaning the blades increased the safe operating range,the pressure ratio and efficiency by 14%,4%and 2%respectively.展开更多
The low ionic conductivities,poor high-voltage stabilities,and lithium dendrite formation of polymer solid electrolytes preclude their use in all-solid-state lithium metal batteries(ASSLMBs).This work provides a simpl...The low ionic conductivities,poor high-voltage stabilities,and lithium dendrite formation of polymer solid electrolytes preclude their use in all-solid-state lithium metal batteries(ASSLMBs).This work provides a simple and scalable technique for constructing fast ion conductor nanofibers(FICNFs)and poly-m-phenyleneisophthalamide(PMIA)nanofibers synergistically enhanced polyethylene oxide(PEO)-based composite solid electrolytes(CSEs)for ASSLMBs.The FICNFs,which were mainly composed of high loadings of ZrO_(2)or Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)nanoparticles,had a percolated ceramic phase inside the nanofibers,while the exposed nanoparticles formed continuous organic–inorganic interfaces with the PEO matrix to enable Li+transport.The interfacial transport rate between ZrO_(2)and PEO was calculated as 4.78×10^(–5)cm^(2)s^(−1)with ab initio molecular dynamics(AIMD)simulations.Besides,the PMIA nanofibers provided strong skeletal support for the CSEs,ensuring excellent mechanical strength and safety for thin CSEs even at high temperatures.More importantly,the amide groups in PMIA provided abundant hydrogen bonds with TFSI−,which lowered the lowest unoccupied molecular orbital(LUMO)level of lithium salts,thus promoting the generation of lithium fluoride-rich solid electrolyte interphase.Consequently,the modified CSEs exhibited satisfactory ionic conductivities(5.38×10^(–4)S cm^(−1)at 50℃)and notable Li dendrite suppression(>1500 h at 0.3 mAh cm^(−2)).The assembled LiFePO_(4)||Li full cells display ultra-long cycles(>2000 cycles)at 50℃ and 40℃.More strikingly,the LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(NMC811)||Li cell also can stably run for 500 cycles,and the LiFePO_(4)||Li flexible pouch cells also cycled normally,demonstrating tremendous potential for practical application.展开更多
文摘NUMBERS OF THE WEEK"1】5"Total yields from insurance premium investment in 2007 reached 279.17 billion yuan($38.77 billion),exceeding the aggregate amount of the previous five years,according to Wu Dingfu, Chairman of China Insurance Regulatory Commission.Wu said it was the best achievement ever for the insurance industry,and the 2007 premium totaled 703.58 billion yuan($97.72 billion), increasing 25 percent year on year. Beijing’s Vice Mayor Chen Gang said(?) total cost of Beijing Olympic venues would amount to 13 billion yuan($1.81(?)
文摘Performance Stable at the Beginning of 2010 2010 is a crucial year as China strives to maintain rapid economic growth while reforming its growth model. The global situation will improve this
文摘Textile industry this year will face more pressure Q1 Textile Industry’s Performance Conference was unveiled by China National Textile & Apparel Council on May 13.Since the beginning of 2011,the standard for defin ing large-scale enterprises was raised from the annual income of 5 million yuan of main business to the annual income of 20 million yuan of main business, according to the latest news.
文摘Indeed,there is some evidence the government’s stimulus package is producing results.Investment of cotton textile industry shows recovery progress and production remains stable.
文摘In this study,aerodynamic behaviors of swept and leaned blades were investigated.Axial and tangential blade curvatures impacts on compressor's operating parameters were analyzed separately.A commercial CFD program which solves the Reynolds-averaged Navier-Stokes equations was used to find out the mentioned impact and the complicated flow field of transonic compressor-rotors.The CFD method that was used for solving flow field's equation was validated by experimental data of NASA Rotor 67.The results showed that the compressor with curved rotors had higher efficiency,rotor pressure ratio and stable operating range compared to the compressor with un-curved rotors.Using curved rotors mostly had higher impact on the overall stable operating range compared to the other operating parameters.Operating range involves choking point and stall point that were changed separately by using of bended blade.For finding the detailed impact of sweep and lean angle on transonic blades,various forms of lean and sweep angles were exerted to basic rotor.It was found that sweep angles increased overall operating range up to 30%,efficiency up to 2%and pressure ratio up to 1%.Leaning the blades increased the safe operating range,the pressure ratio and efficiency by 14%,4%and 2%respectively.
基金supported by the National Natural Science Foundation of China(52203066,22005216,51973157,61904123)the Tianjin Natural Science Foundation(18JCQNJC02900)+5 种基金National innovation and entrepreneurship training program for college students(202310058007)Tianjin Municipal college students’innovation and entrepreneurship training program(202310058088)Tianjin Enterprise Science and Technology Commissioner Project(23YDTPJC00490)China Postdoctoral Science Foundation Grant(2023M742135)State Key Laboratory of Membrane and Membrane Separation,Tiangong Universitysupported as part of the opening fund of Key Laboratory of Rare Earths,Chinese Academy of Sciences.
文摘The low ionic conductivities,poor high-voltage stabilities,and lithium dendrite formation of polymer solid electrolytes preclude their use in all-solid-state lithium metal batteries(ASSLMBs).This work provides a simple and scalable technique for constructing fast ion conductor nanofibers(FICNFs)and poly-m-phenyleneisophthalamide(PMIA)nanofibers synergistically enhanced polyethylene oxide(PEO)-based composite solid electrolytes(CSEs)for ASSLMBs.The FICNFs,which were mainly composed of high loadings of ZrO_(2)or Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)nanoparticles,had a percolated ceramic phase inside the nanofibers,while the exposed nanoparticles formed continuous organic–inorganic interfaces with the PEO matrix to enable Li+transport.The interfacial transport rate between ZrO_(2)and PEO was calculated as 4.78×10^(–5)cm^(2)s^(−1)with ab initio molecular dynamics(AIMD)simulations.Besides,the PMIA nanofibers provided strong skeletal support for the CSEs,ensuring excellent mechanical strength and safety for thin CSEs even at high temperatures.More importantly,the amide groups in PMIA provided abundant hydrogen bonds with TFSI−,which lowered the lowest unoccupied molecular orbital(LUMO)level of lithium salts,thus promoting the generation of lithium fluoride-rich solid electrolyte interphase.Consequently,the modified CSEs exhibited satisfactory ionic conductivities(5.38×10^(–4)S cm^(−1)at 50℃)and notable Li dendrite suppression(>1500 h at 0.3 mAh cm^(−2)).The assembled LiFePO_(4)||Li full cells display ultra-long cycles(>2000 cycles)at 50℃ and 40℃.More strikingly,the LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(NMC811)||Li cell also can stably run for 500 cycles,and the LiFePO_(4)||Li flexible pouch cells also cycled normally,demonstrating tremendous potential for practical application.
