[Objective] This study was conducted to select wheat varieties with high P use efficiency. [Method] A field experiment was carried out with 112 wheat germplasm varieties as experiment materials under normal （NP） and...[Objective] This study was conducted to select wheat varieties with high P use efficiency. [Method] A field experiment was carried out with 112 wheat germplasm varieties as experiment materials under normal （NP） and low phosphorus （LP） conditions, and with Jimai 22 as control, genotypes with high P use efficiency and excellent yield traits were selected. [Result] Compared with NP treatment, 8 wheat yield-related traits, spike number per plant, thousand-grain weight plant height, spike length, fertile spikelet number per spike, grain number per spike, grain weight per plant and above-land weight per plant, and 3 P content traits, grain, straw and above-land P contents per plant decreased significantly under LP condition （P〈〈 0.05）, while 3 P utilization efficiency traits, grain, straw and aboveground P utilization efficiencies increased obviously, indicating that low P stress would greatly reduce yield and P content of wheat at adult stage, but would remarkably improve P utilization efficiency. Correlation analysis showed that plant height, fertile spikelet number per spike and grain weight per plant and straw and above-land P concentrations were in significant positive correlation with 3 P content traits, grain, straw and above-land P contents per plant, and in significant negative correlation with 2 Putilization efficiency traits, straw and above-land P utilization efficiencies （P〈0.01）, and could serve as indexes for preliminary rapid evaluation of P use efficiency. Under NP treatment, 17 genotypes with high P use efficiency were selected, and among them, Hanxuan H28, 2010 Pin 4891 and Zhoumai 28 showed grain weights per plant higher than Jimai 22 by 36.07%, 31.96% and 37.44%, respectively, and above-land P utilization efficiency higher than Jimai 22 by 49.34%, 49.42% and 33.05%, respectively; and under LP treatment, 10 genotypes with high P use efficiency were selected, and among them, Henong 826 showed grain weight per plant and above-land P utilization efficiency higher than Jimai 22 by 37.60% and 20.42%, respectively. Furthermore, Hanxuan H23, Hanxuan H28 and Xumai 856 were identified as genotypes with high P use efficiency under both NP and LP treatments. [Conclusion] This study provides good parent materials for breeding of varieties with high P use efficiency.展开更多
This article summarizes the comparison between the preparation, structure and mechanical properties of long fiber reinforced thermoplastics （LFT） and short fiber reinforced thermoplastics （SFT）. Both of the experi...This article summarizes the comparison between the preparation, structure and mechanical properties of long fiber reinforced thermoplastics （LFT） and short fiber reinforced thermoplastics （SFT）. Both of the experiment and theory results showed that the mechanical properties of long glass fiber reinforced thermoplastics pellets （LGFRT） have been enhanced better than that of short glass fiber reinforced thermoplastics pellets （SGFRT） manufactured by molding procession. After regulation of the relative humidity by 50 % , the mechanical properties of 30 % （ weight percent） short glass fiber content in SFT （ SFT-PA6-SGF30 ） are similar to that of 40 % long glass fiber content in LFT. Howev- er, the density of the latter is about 17 % lower than that of the former. Thus, the corresponding weight of products is reduced by 13 % ;output rate is increased by 21% , and the cost is therefore significantly lowered. And it has the fol- lowing advantages： impact strength is increased by 87 % ; the proportion is reduced by 20 % ; molding cycle is short- ened by 10 % ;materials cost is saved by 20 % -30 % and the final total cost is saved by 30 % -40 %. So LFT （LFT-PP-LGF40） can replace SFT （SFT-PA6-SGF30） with the similar basic mechanical properties under normal tem- perature or 160 ℃ lower.展开更多
Objective： The aim of this retrospective investigation was to explore the influence of femoral osteoporosis on short-term curative effects ofcementless hip arthroplasty and to evaluate the femoral metaphyseal bone mi...Objective： The aim of this retrospective investigation was to explore the influence of femoral osteoporosis on short-term curative effects ofcementless hip arthroplasty and to evaluate the femoral metaphyseal bone mineral density （BMD） for femoral osteoporosis in order to guide prosthesis choice and rehabilitation. Methods： We performed 127 total arthroplasty operations between June 1999 to February 2003 and investigated 49 cementless hip replacements with the Metalcancellous cementless Lubeck Ⅱ system being used in all hips. There were twenty men and twenty-nine women whose mean age at the time of the operation was 60 years （range, 52-81 years）. The patients were divided into osteoporosis or normal groups according to the femoral metaphyseal BMD measured preoperatively. The average duration of follow-up was 30 months （range, 8-52 months）. We evaluated all of the patients from a clinical standpoint with use of a standard-terminology questionnaire with respect to the short-term curative effects and patients＇ satisfaction. Hip pain status and functional ability were important indicators of treatment efficacy. Results： Harris hip score and patients＇ satisfaction in femoral osteoporosis patients who underwent noncemented hip arthroplasty were lower （P=0.004, P=0.03） while the incidence of thigh pain was higher （P=0.03） than the patients with non-osteoporosis. Conclusion： The higher incidence of pain, as well as the decrease in function experienced by the patients in osteoporosis group, supports the case that cementless arthroplasty is not a better choice for those patients and that we had better select prosthesis based on the femoral metaphyseal BMD.展开更多
基金Supported by Jinan Agricultural Science and Technology Innovation Project(201313,201404)Jinan Science and Technology Planning Project(201401103)~~
文摘[Objective] This study was conducted to select wheat varieties with high P use efficiency. [Method] A field experiment was carried out with 112 wheat germplasm varieties as experiment materials under normal （NP） and low phosphorus （LP） conditions, and with Jimai 22 as control, genotypes with high P use efficiency and excellent yield traits were selected. [Result] Compared with NP treatment, 8 wheat yield-related traits, spike number per plant, thousand-grain weight plant height, spike length, fertile spikelet number per spike, grain number per spike, grain weight per plant and above-land weight per plant, and 3 P content traits, grain, straw and above-land P contents per plant decreased significantly under LP condition （P〈〈 0.05）, while 3 P utilization efficiency traits, grain, straw and aboveground P utilization efficiencies increased obviously, indicating that low P stress would greatly reduce yield and P content of wheat at adult stage, but would remarkably improve P utilization efficiency. Correlation analysis showed that plant height, fertile spikelet number per spike and grain weight per plant and straw and above-land P concentrations were in significant positive correlation with 3 P content traits, grain, straw and above-land P contents per plant, and in significant negative correlation with 2 Putilization efficiency traits, straw and above-land P utilization efficiencies （P〈0.01）, and could serve as indexes for preliminary rapid evaluation of P use efficiency. Under NP treatment, 17 genotypes with high P use efficiency were selected, and among them, Hanxuan H28, 2010 Pin 4891 and Zhoumai 28 showed grain weights per plant higher than Jimai 22 by 36.07%, 31.96% and 37.44%, respectively, and above-land P utilization efficiency higher than Jimai 22 by 49.34%, 49.42% and 33.05%, respectively; and under LP treatment, 10 genotypes with high P use efficiency were selected, and among them, Henong 826 showed grain weight per plant and above-land P utilization efficiency higher than Jimai 22 by 37.60% and 20.42%, respectively. Furthermore, Hanxuan H23, Hanxuan H28 and Xumai 856 were identified as genotypes with high P use efficiency under both NP and LP treatments. [Conclusion] This study provides good parent materials for breeding of varieties with high P use efficiency.
文摘This article summarizes the comparison between the preparation, structure and mechanical properties of long fiber reinforced thermoplastics （LFT） and short fiber reinforced thermoplastics （SFT）. Both of the experiment and theory results showed that the mechanical properties of long glass fiber reinforced thermoplastics pellets （LGFRT） have been enhanced better than that of short glass fiber reinforced thermoplastics pellets （SGFRT） manufactured by molding procession. After regulation of the relative humidity by 50 % , the mechanical properties of 30 % （ weight percent） short glass fiber content in SFT （ SFT-PA6-SGF30 ） are similar to that of 40 % long glass fiber content in LFT. Howev- er, the density of the latter is about 17 % lower than that of the former. Thus, the corresponding weight of products is reduced by 13 % ;output rate is increased by 21% , and the cost is therefore significantly lowered. And it has the fol- lowing advantages： impact strength is increased by 87 % ; the proportion is reduced by 20 % ; molding cycle is short- ened by 10 % ;materials cost is saved by 20 % -30 % and the final total cost is saved by 30 % -40 %. So LFT （LFT-PP-LGF40） can replace SFT （SFT-PA6-SGF30） with the similar basic mechanical properties under normal tem- perature or 160 ℃ lower.
基金Project (No. 419200-584602) supported by the Start Foundation for Introducing Talent of Zhejiang University, China
文摘Objective： The aim of this retrospective investigation was to explore the influence of femoral osteoporosis on short-term curative effects ofcementless hip arthroplasty and to evaluate the femoral metaphyseal bone mineral density （BMD） for femoral osteoporosis in order to guide prosthesis choice and rehabilitation. Methods： We performed 127 total arthroplasty operations between June 1999 to February 2003 and investigated 49 cementless hip replacements with the Metalcancellous cementless Lubeck Ⅱ system being used in all hips. There were twenty men and twenty-nine women whose mean age at the time of the operation was 60 years （range, 52-81 years）. The patients were divided into osteoporosis or normal groups according to the femoral metaphyseal BMD measured preoperatively. The average duration of follow-up was 30 months （range, 8-52 months）. We evaluated all of the patients from a clinical standpoint with use of a standard-terminology questionnaire with respect to the short-term curative effects and patients＇ satisfaction. Hip pain status and functional ability were important indicators of treatment efficacy. Results： Harris hip score and patients＇ satisfaction in femoral osteoporosis patients who underwent noncemented hip arthroplasty were lower （P=0.004, P=0.03） while the incidence of thigh pain was higher （P=0.03） than the patients with non-osteoporosis. Conclusion： The higher incidence of pain, as well as the decrease in function experienced by the patients in osteoporosis group, supports the case that cementless arthroplasty is not a better choice for those patients and that we had better select prosthesis based on the femoral metaphyseal BMD.
