The impact of multi-directional compression passes on the microstructure,mechanical properties,and corrosion behavior of ZK60 magnesium alloy was investigated.Results reveal that severe dendrite segregation exists in ...The impact of multi-directional compression passes on the microstructure,mechanical properties,and corrosion behavior of ZK60 magnesium alloy was investigated.Results reveal that severe dendrite segregation exists in the as-cast ZK60 magnesium alloy with coarse MgZn phases distributed along the grain boundaries.After 9 passes of compression,the coarse solidified phases at the grain boundary are significantly refined,and back dissolution occurs.Fine recrystallized grains accompanied with the fine diffused nano-phases emerge in the local area around the large grains.The tensile strength of ZK60 magnesium alloy generally exhibits the upward trend with the increase in compression passes,whereas the compression rate shows the downward trend.The compressive strength reaches 433.6 MPa with the compression rate of 21.3%after 9 passes of compression.Multi-directional compression can significantly reduce the degradation rate of ZK60 magnesium alloy in simulated body fluids.Furthermore,it is observed that in the ascast ZK60 magnesium alloy,micro-segregation can easily lead to severe intragranular local corrosion.However,after multidirectional compression,the tendency to intragranular local corrosion is significantly diminished.展开更多
The pre-feasibility, report and dam site selection scheme of Guandi Hydropower Project has passed examination on the Examination Meeting held in Chengdu. Sichuan Province from March 16 to March 20. 1996. It indicates ...The pre-feasibility, report and dam site selection scheme of Guandi Hydropower Project has passed examination on the Examination Meeting held in Chengdu. Sichuan Province from March 16 to March 20. 1996. It indicates a step forward toward feasibility, study and the project be put in the state development program. The programmed Guandi Hydropover展开更多
NAN Rendong,a distinguished expert in radio astronomy who is known as the father of the world’s largest radio telescope,died from lung cancer in Boston on September 15,2017 at the age of 72.His untimely passing away ...NAN Rendong,a distinguished expert in radio astronomy who is known as the father of the world’s largest radio telescope,died from lung cancer in Boston on September 15,2017 at the age of 72.His untimely passing away was just ten days before his masterpiece,the Five-hundred-meter Aperture Spherical radio Telescope(FAST),which he spent over two decades conceiving and building for the next generation展开更多
The evolution of southwest Montana’s Big Hole and Beaverhead River drainage basins is determined from topographic map evidence related to mountain passes crossing what are today high altitude drainage divides includi...The evolution of southwest Montana’s Big Hole and Beaverhead River drainage basins is determined from topographic map evidence related to mountain passes crossing what are today high altitude drainage divides including North America’s east-west Continental Divide. Map evidence, such as orientations of valleys leading away from mountain passes (and saddles) and barbed tributaries found along the downstream drainage routes, is used to reconstruct flow directions of streams and rivers that once crossed the present-day high mountain divides. Large south-oriented anastomosing complexes of diverging and converging channels are interpreted to have eroded what are today closely spaced passes and saddles now notched into high mountain ridges. Water in those south-oriented channels is interpreted to have flowed across emerging mountains and subsiding basins. Headward erosion of deeper southeast-oriented valleys, assisted by crustal warping, concentrated south-oriented water in fewer and deeper valleys as the water flowed from southwest Montana into what are today Idaho and the Snake River drainage basin. Headward erosion of the Big Hole River valley between the emerging Anaconda and Pioneer Mountains, also assisted by crustal warping, reversed all Big Hole Basin drainage so as to create the north-, east-, and south-oriented Big Hole River drainage route. A final and even more major reversal of flow in the present-day north-oriented Montana Missouri River valley, with the assistance of additional crustal warping, next ended all remaining flow to Idaho and the Snake River drainage basin and reversed and captured all drainage in the present-day north-oriented Big Hole, Beaverhead, and Red Rock River drainage basins. The observed map evidence indicates that prior to the final flow reversal events, large volumes of south-oriented water flowed across southwest Montana’s Big Hole and Beaverhead River drainage basins.展开更多
Information on the effect of soil compaction on soil mechanical properties such as degree of compaction,compression and shear strength of tropical soils of Nigeria under different machinery traffic passes is very scar...Information on the effect of soil compaction on soil mechanical properties such as degree of compaction,compression and shear strength of tropical soils of Nigeria under different machinery traffic passes is very scarce.Field experiment was conducted in a tilled and compacted sandy clay loam(Alfisol)in Akure,Nigeria,under different machinery traffic passes to determine compaction effects on bulk density,compression strength,degree of compaction and the shear strength of soil.Four plots,A,B,C and D of area 20 m×50 m each were used for the field experiment.Treatment plot A was tilled with a tractor-mounted disc plough,and the remaining three plots:B,C and D were subjected to 5,10 and 15 to and fro passes,respectively,using heavy duty Mercy Fergusson tractor model 4355(3.82 Mg).The treatments were replicated three times in a randomized complete block design.Compacted plots progressively increased the bulk density from 1.63 g/cm^(3) to 1.90 g/cm^(3),but the highest bulk density was observed in plots under 15 traffic passes with the value of(1.90±0.23)g/cm3.The percentage of soil compaction varies from 90.5%to 97%at the 0-10 cm soil layer.The compression strength of soil increased from 31.00 kPa to 42.05 kPa and from 29.68 to 65.44 kPa at the 0-10 cm and 10-20 cm soil layers,respectively,which resulted in the increased shear strength from 15.79 kPa to 21.03 kPa and 14.8 kPa to 32.72 kPa at the 0-10 cm and 10-20 cm in plots under 5 and 15 traffic passes,respectively.Plot A(tilled soil)had the lowest bulk density,degree of compaction and compression strength with values(1.51±0.19)g/cm^(3),88.2%,and(12.15±0.37)kPa,respectively,and consequently the lowest shear strength of(6.02±1.23)kPa,which enhanced air movement and microbial activities in the soil.Soil under 15 traffic passes,especially at the 10-20 cm soil layer,may result in poor root penetration when cropped but can be very reliable and consistent when used for structural purposes.展开更多
The central government's regulations on the sale and purchase of horses in the Land within the Passes(Guanzhong關中)and their entry and exit from the Pass in the“Ordinances on Fords and Passes”(Jinguan ling津關...The central government's regulations on the sale and purchase of horses in the Land within the Passes(Guanzhong關中)and their entry and exit from the Pass in the“Ordinances on Fords and Passes”(Jinguan ling津關令)are important sources for understanding the horse policy of the early Western Han Dynasty and recognizing the relationship between the dynasty and the counties and vassal states outside the Pass.By examining the ordinances on the purchase and sale of horses,it is clear that the Han state strictly controlled horses,restricted private ownership of horses,and prohibited horses from exiting the Pass.However,some"privileged classes"still had the right to purchase horses from the Han government and take them out of the Pass after following some legal procedures,but this privilege was entirely dependent on the imperial power.Behind these regulations,it reflects the legislative thought of the supremacy of imperial power,"power over law"(“權大于法”),and the fundamental purpose of consolidating centralized power,weakening the strength of vassal states,and"strengthening the central forces while weakening the local ones"(“强幹弱枝”).展开更多
On the 14th of September,1994, the fastest scientific instrument in space passed the south pole of the Sun,a place where no human-made object has been before. A spaceprobe called Ulysses made the polar pass at about m...On the 14th of September,1994, the fastest scientific instrument in space passed the south pole of the Sun,a place where no human-made object has been before. A spaceprobe called Ulysses made the polar pass at about midday as it continued to collect data on the solar wind,a stream of high-energy展开更多
SHUAI Mengqi, an outstanding member of the Communist Party of China (CPC) and a pioneer of the Chinese women’s movement, died of illness on April 13, 1998, in Beijing, at the age of 102. Shuai Mengqi had been born to
Jiang Zemin passed away due to leukemia and multiple organ failure in Shanghai at 12:13 p.m. on November 30, 2022, at the age of 96, it was announced later that day. The announcement was made by the Central Committee ...Jiang Zemin passed away due to leukemia and multiple organ failure in Shanghai at 12:13 p.m. on November 30, 2022, at the age of 96, it was announced later that day. The announcement was made by the Central Committee of the Communist Party of China (CPC), the Standing Committee of the National People’s Congress of the People’s Republic of China (PRC), the State Council of the PRC.展开更多
Lang Rongbiao and Hou Dongmei,a couple living in North China's Tianjin Municipality,are retired professional athletes who won numerous awards during wushu(Chinese martial arts)competitions,both at home and abroad....Lang Rongbiao and Hou Dongmei,a couple living in North China's Tianjin Municipality,are retired professional athletes who won numerous awards during wushu(Chinese martial arts)competitions,both at home and abroad.Now,they are the principal and head coach,respectively,of a Tianjin-based martial arts school.Working together,they educate and cultivate wushu talents for China.What's more,the couple is dedicated to sharing the unique spirit of Chinese martial arts with the world.展开更多
2024年日本机床展览会(JIMTOF2024)于2024年11月5~10日在东京Tokyo Big Sight举办,展出面积118540平方米。展会以“技术传承提供无限可能(Technologies passed down to the future offer unlimited possibilities)”为主题。
On January 5th,2009 Tianjin Tianyao PharmaceuticalCo.,Ltd.(Tianjin Tianyao,SH:600488)announced thatit had passed authentication of COS from the EuropeanDirectorate for the Quality of Medicine & Healthcare(EDQM)for...On January 5th,2009 Tianjin Tianyao PharmaceuticalCo.,Ltd.(Tianjin Tianyao,SH:600488)announced thatit had passed authentication of COS from the EuropeanDirectorate for the Quality of Medicine & Healthcare(EDQM)for its two products-Methylprednisoloneand Spironolactone in December 2008.By the end of2008,six products of Tianjin Tianyao have passed au-thentication of COSAccording to a source from Tianjin Tianyao,the com-pany will enjoy tax preference in the next three years dueto confirmation as a high-tech enterprise.展开更多
COFCO Limited(formerly known as China National Cereals, Oils & FoodstuffsCorporation)passed technical appraisal for its 200000 t/a cassava-based fuel ethanolproject on April 8th, 2009.The demonstrative project, at...COFCO Limited(formerly known as China National Cereals, Oils & FoodstuffsCorporation)passed technical appraisal for its 200000 t/a cassava-based fuel ethanolproject on April 8th, 2009.The demonstrative project, at Hepu Industrial Park in Beihai, Guangxi province,展开更多
The 1.0 million t/a large aromatic integrated project in CNPC Urumqi Petro-chemical Company Ltd.has recently passed preliminary design evaluation in Beijing.It indicates the launching of the large project.The project ...The 1.0 million t/a large aromatic integrated project in CNPC Urumqi Petro-chemical Company Ltd.has recently passed preliminary design evaluation in Beijing.It indicates the launching of the large project.The project has 8 production units including a 1.0 million t/a p-xylene unit.Continuous catalytic reforming and adsorption separation units will use展开更多
目的:利用患者可接受症状状态结合波士顿腕管问卷评分对比患者对自制开窗式透明管道辅助关节镜微创双切口入路与常规开放单切口入路这两种手术方案术后患肢功能状态的满意度,以此来比较这两种手术方案的疗效。方法:通过电话回访进行两个...目的:利用患者可接受症状状态结合波士顿腕管问卷评分对比患者对自制开窗式透明管道辅助关节镜微创双切口入路与常规开放单切口入路这两种手术方案术后患肢功能状态的满意度,以此来比较这两种手术方案的疗效。方法:通过电话回访进行两个PASS锚定问题调查并完成波士顿腕管问卷,对数据进行统计学分析。结果:在平均12 ± 1月的随访中,内镜组PASS(+)患者占总体患者比例大于开放组,且内镜患者的SSS和FSS分数显著低于开放组患者。结论:患者对自制开窗式透明管道辅助关节镜微创双切口入路术后症状状态接受程度较高。Objective: To compare the postoperative functional outcomes and patient satisfaction between two surgical approaches for carpal tunnel syndrome—self-made fenestrated transparent cannula-assisted endoscopic minimally invasive double-incision approach and conventional open single-incision approach—using Patient Acceptable Symptom State (PASS) combined with Boston Carpal Tunnel Questionnaire (BCTQ) scores. Methods: A telephone follow-up was conducted to administer two PASS anchor questions and complete the BCTQ. Data were analyzed statistically to evaluate differences in symptom severity, functional status, and patient-reported satisfaction. Results: At a mean follow-up of 12 ± 1 months, the proportion of PASS(+) patients in the endoscopic group was significantly higher than that in the open group. Additionally, the endoscopic group demonstrated significantly lower Symptom Severity Scale (SSS) and Functional Status Scale (FSS) scores compared to the open group. Conclusion: Patients demonstrated a high level of acceptance toward their postoperative symptom status following the arthroscopic minimally invasive dual-incision approach assisted by a custom-made fenestrated transparent sheath.展开更多
基金Guangdong Ocean University Research Launch Project(060302062310)。
文摘The impact of multi-directional compression passes on the microstructure,mechanical properties,and corrosion behavior of ZK60 magnesium alloy was investigated.Results reveal that severe dendrite segregation exists in the as-cast ZK60 magnesium alloy with coarse MgZn phases distributed along the grain boundaries.After 9 passes of compression,the coarse solidified phases at the grain boundary are significantly refined,and back dissolution occurs.Fine recrystallized grains accompanied with the fine diffused nano-phases emerge in the local area around the large grains.The tensile strength of ZK60 magnesium alloy generally exhibits the upward trend with the increase in compression passes,whereas the compression rate shows the downward trend.The compressive strength reaches 433.6 MPa with the compression rate of 21.3%after 9 passes of compression.Multi-directional compression can significantly reduce the degradation rate of ZK60 magnesium alloy in simulated body fluids.Furthermore,it is observed that in the ascast ZK60 magnesium alloy,micro-segregation can easily lead to severe intragranular local corrosion.However,after multidirectional compression,the tendency to intragranular local corrosion is significantly diminished.
文摘The pre-feasibility, report and dam site selection scheme of Guandi Hydropower Project has passed examination on the Examination Meeting held in Chengdu. Sichuan Province from March 16 to March 20. 1996. It indicates a step forward toward feasibility, study and the project be put in the state development program. The programmed Guandi Hydropover
文摘NAN Rendong,a distinguished expert in radio astronomy who is known as the father of the world’s largest radio telescope,died from lung cancer in Boston on September 15,2017 at the age of 72.His untimely passing away was just ten days before his masterpiece,the Five-hundred-meter Aperture Spherical radio Telescope(FAST),which he spent over two decades conceiving and building for the next generation
文摘The evolution of southwest Montana’s Big Hole and Beaverhead River drainage basins is determined from topographic map evidence related to mountain passes crossing what are today high altitude drainage divides including North America’s east-west Continental Divide. Map evidence, such as orientations of valleys leading away from mountain passes (and saddles) and barbed tributaries found along the downstream drainage routes, is used to reconstruct flow directions of streams and rivers that once crossed the present-day high mountain divides. Large south-oriented anastomosing complexes of diverging and converging channels are interpreted to have eroded what are today closely spaced passes and saddles now notched into high mountain ridges. Water in those south-oriented channels is interpreted to have flowed across emerging mountains and subsiding basins. Headward erosion of deeper southeast-oriented valleys, assisted by crustal warping, concentrated south-oriented water in fewer and deeper valleys as the water flowed from southwest Montana into what are today Idaho and the Snake River drainage basin. Headward erosion of the Big Hole River valley between the emerging Anaconda and Pioneer Mountains, also assisted by crustal warping, reversed all Big Hole Basin drainage so as to create the north-, east-, and south-oriented Big Hole River drainage route. A final and even more major reversal of flow in the present-day north-oriented Montana Missouri River valley, with the assistance of additional crustal warping, next ended all remaining flow to Idaho and the Snake River drainage basin and reversed and captured all drainage in the present-day north-oriented Big Hole, Beaverhead, and Red Rock River drainage basins. The observed map evidence indicates that prior to the final flow reversal events, large volumes of south-oriented water flowed across southwest Montana’s Big Hole and Beaverhead River drainage basins.
文摘Information on the effect of soil compaction on soil mechanical properties such as degree of compaction,compression and shear strength of tropical soils of Nigeria under different machinery traffic passes is very scarce.Field experiment was conducted in a tilled and compacted sandy clay loam(Alfisol)in Akure,Nigeria,under different machinery traffic passes to determine compaction effects on bulk density,compression strength,degree of compaction and the shear strength of soil.Four plots,A,B,C and D of area 20 m×50 m each were used for the field experiment.Treatment plot A was tilled with a tractor-mounted disc plough,and the remaining three plots:B,C and D were subjected to 5,10 and 15 to and fro passes,respectively,using heavy duty Mercy Fergusson tractor model 4355(3.82 Mg).The treatments were replicated three times in a randomized complete block design.Compacted plots progressively increased the bulk density from 1.63 g/cm^(3) to 1.90 g/cm^(3),but the highest bulk density was observed in plots under 15 traffic passes with the value of(1.90±0.23)g/cm3.The percentage of soil compaction varies from 90.5%to 97%at the 0-10 cm soil layer.The compression strength of soil increased from 31.00 kPa to 42.05 kPa and from 29.68 to 65.44 kPa at the 0-10 cm and 10-20 cm soil layers,respectively,which resulted in the increased shear strength from 15.79 kPa to 21.03 kPa and 14.8 kPa to 32.72 kPa at the 0-10 cm and 10-20 cm in plots under 5 and 15 traffic passes,respectively.Plot A(tilled soil)had the lowest bulk density,degree of compaction and compression strength with values(1.51±0.19)g/cm^(3),88.2%,and(12.15±0.37)kPa,respectively,and consequently the lowest shear strength of(6.02±1.23)kPa,which enhanced air movement and microbial activities in the soil.Soil under 15 traffic passes,especially at the 10-20 cm soil layer,may result in poor root penetration when cropped but can be very reliable and consistent when used for structural purposes.
文摘The central government's regulations on the sale and purchase of horses in the Land within the Passes(Guanzhong關中)and their entry and exit from the Pass in the“Ordinances on Fords and Passes”(Jinguan ling津關令)are important sources for understanding the horse policy of the early Western Han Dynasty and recognizing the relationship between the dynasty and the counties and vassal states outside the Pass.By examining the ordinances on the purchase and sale of horses,it is clear that the Han state strictly controlled horses,restricted private ownership of horses,and prohibited horses from exiting the Pass.However,some"privileged classes"still had the right to purchase horses from the Han government and take them out of the Pass after following some legal procedures,but this privilege was entirely dependent on the imperial power.Behind these regulations,it reflects the legislative thought of the supremacy of imperial power,"power over law"(“權大于法”),and the fundamental purpose of consolidating centralized power,weakening the strength of vassal states,and"strengthening the central forces while weakening the local ones"(“强幹弱枝”).
文摘On the 14th of September,1994, the fastest scientific instrument in space passed the south pole of the Sun,a place where no human-made object has been before. A spaceprobe called Ulysses made the polar pass at about midday as it continued to collect data on the solar wind,a stream of high-energy
文摘SHUAI Mengqi, an outstanding member of the Communist Party of China (CPC) and a pioneer of the Chinese women’s movement, died of illness on April 13, 1998, in Beijing, at the age of 102. Shuai Mengqi had been born to
文摘Jiang Zemin passed away due to leukemia and multiple organ failure in Shanghai at 12:13 p.m. on November 30, 2022, at the age of 96, it was announced later that day. The announcement was made by the Central Committee of the Communist Party of China (CPC), the Standing Committee of the National People’s Congress of the People’s Republic of China (PRC), the State Council of the PRC.
文摘Lang Rongbiao and Hou Dongmei,a couple living in North China's Tianjin Municipality,are retired professional athletes who won numerous awards during wushu(Chinese martial arts)competitions,both at home and abroad.Now,they are the principal and head coach,respectively,of a Tianjin-based martial arts school.Working together,they educate and cultivate wushu talents for China.What's more,the couple is dedicated to sharing the unique spirit of Chinese martial arts with the world.
文摘2024年日本机床展览会(JIMTOF2024)于2024年11月5~10日在东京Tokyo Big Sight举办,展出面积118540平方米。展会以“技术传承提供无限可能(Technologies passed down to the future offer unlimited possibilities)”为主题。
文摘On January 5th,2009 Tianjin Tianyao PharmaceuticalCo.,Ltd.(Tianjin Tianyao,SH:600488)announced thatit had passed authentication of COS from the EuropeanDirectorate for the Quality of Medicine & Healthcare(EDQM)for its two products-Methylprednisoloneand Spironolactone in December 2008.By the end of2008,six products of Tianjin Tianyao have passed au-thentication of COSAccording to a source from Tianjin Tianyao,the com-pany will enjoy tax preference in the next three years dueto confirmation as a high-tech enterprise.
文摘COFCO Limited(formerly known as China National Cereals, Oils & FoodstuffsCorporation)passed technical appraisal for its 200000 t/a cassava-based fuel ethanolproject on April 8th, 2009.The demonstrative project, at Hepu Industrial Park in Beihai, Guangxi province,
文摘The 1.0 million t/a large aromatic integrated project in CNPC Urumqi Petro-chemical Company Ltd.has recently passed preliminary design evaluation in Beijing.It indicates the launching of the large project.The project has 8 production units including a 1.0 million t/a p-xylene unit.Continuous catalytic reforming and adsorption separation units will use
文摘目的:利用患者可接受症状状态结合波士顿腕管问卷评分对比患者对自制开窗式透明管道辅助关节镜微创双切口入路与常规开放单切口入路这两种手术方案术后患肢功能状态的满意度,以此来比较这两种手术方案的疗效。方法:通过电话回访进行两个PASS锚定问题调查并完成波士顿腕管问卷,对数据进行统计学分析。结果:在平均12 ± 1月的随访中,内镜组PASS(+)患者占总体患者比例大于开放组,且内镜患者的SSS和FSS分数显著低于开放组患者。结论:患者对自制开窗式透明管道辅助关节镜微创双切口入路术后症状状态接受程度较高。Objective: To compare the postoperative functional outcomes and patient satisfaction between two surgical approaches for carpal tunnel syndrome—self-made fenestrated transparent cannula-assisted endoscopic minimally invasive double-incision approach and conventional open single-incision approach—using Patient Acceptable Symptom State (PASS) combined with Boston Carpal Tunnel Questionnaire (BCTQ) scores. Methods: A telephone follow-up was conducted to administer two PASS anchor questions and complete the BCTQ. Data were analyzed statistically to evaluate differences in symptom severity, functional status, and patient-reported satisfaction. Results: At a mean follow-up of 12 ± 1 months, the proportion of PASS(+) patients in the endoscopic group was significantly higher than that in the open group. Additionally, the endoscopic group demonstrated significantly lower Symptom Severity Scale (SSS) and Functional Status Scale (FSS) scores compared to the open group. Conclusion: Patients demonstrated a high level of acceptance toward their postoperative symptom status following the arthroscopic minimally invasive dual-incision approach assisted by a custom-made fenestrated transparent sheath.
