Focusing on the Yangtze River economic zone,the previous geological researches are systematically summarized,resources and environment conditions and major geological problems which are needing to be concerned in land...Focusing on the Yangtze River economic zone,the previous geological researches are systematically summarized,resources and environment conditions and major geological problems which are needing to be concerned in land planning and construction are studied.The results show that the resource conditions of cultivated land,shale gas,geotherm,lithium and so on are superior in the Yangtze River economic zone,and the resources and environment conditions are conducive to develop the modern agriculture,clean energy industry and strategic emerging industries.3×1013 m^2 farmlands without heavy metal pollution are concentrated;there are three national level shale gas exploration and development bases with explored reserves of 5.441×1011 m^3;geothermal availability is 2.4×109 t of standard coal each year,equivalent to 19% of the amount of coal in 2014;Asia's largest energy lithium metal ore deposit is found.In some parts of Yangtze River economic zone,there are some major geological problems such as active faults,karst collapse,ground subsidence,landslide-collapse-debris flow,affecting the river-crossing channels,high-speed railway,urban agglomeration and green ecological corridor planning and construction.Those problems should be concerned,and the relevant suggestions and countermeasures are put forward.Meanwhile,the ideas to further support the development of the Yangtze River economic zone are put forward.展开更多
This study aimed to improve egg-laying performance in incubating Magang geese of Guangdong origin and Landaise geese of French origin. In experiment 1, 50 adults, egg-laying Magang geese were inoculated intramuscular...This study aimed to improve egg-laying performance in incubating Magang geese of Guangdong origin and Landaise geese of French origin. In experiment 1, 50 adults, egg-laying Magang geese were inoculated intramuscularly （i.m.） on days 0, 22, and 45 with 1 mL of immunogen containing 1 mg of recombinant chicken inhibin fusion protein. Immunization significantly increased blood antibody titers against inhibin fusion protein, but did not affect the egg-laying performance within 10 days after the first inoculation. From day 15, the egg-laying rate in inhibin-immunized group increased and was significantly higher than the values of control geese from day 40 to 55. However, the reverse was true from day 55 to 75 when more immunized geese developed incubation. In the entire 120 days of the experiment, the immunized geese laid 17.3 eggs in contrast to 16.4 eggs laid by the control geese. From day 30 till the end of the experiment, weight of eggs in the control geese was significantly greater than that in inhibin-immunized birds. In experiment 2, 40 Landaise geese were immunized against inhibin, as described in experiment 1. These geese laid 9.0 eggs on average in contrast to 7.3 eggs laid by nonimmunized control geese over 90 days of egg laying. The above results demonstrated that immunization against recombinant chicken inhibin fusion protein improved egg-laying performance in geese, and the increment was higher in nonincubating geese.展开更多
目的探讨智能快速磁共振(IQMR)在提高颅内三维血管壁磁共振成像(VWI)图像质量及缩短扫描时间中的应用价值。方法2022年12月至2023年2月收集29名健康志愿者,均接受快速低分辨率(LR-VWI)和常规高分辨率(HR-VWI)颅内VWI序列扫描,应用IQMR对...目的探讨智能快速磁共振(IQMR)在提高颅内三维血管壁磁共振成像(VWI)图像质量及缩短扫描时间中的应用价值。方法2022年12月至2023年2月收集29名健康志愿者,均接受快速低分辨率(LR-VWI)和常规高分辨率(HR-VWI)颅内VWI序列扫描,应用IQMR对LR-VWI进行后处理得到IQMR-VWI,并记录成像时间。选取峰值信噪比(PSNR)和结构相似性(SSIM)两个指标进行图像质量客观评价,这两个指标的结果皆是以HR-VWI为参照,分别对LR-VWI及IQMR-VWI测量而得出。由两名放射科医师使用李克特5分量表(Likert scale)在对图像类型(LR-VWI、IQMR-VWI、HR-VWI)不知情的情况下对血管壁的质量和图像整体质量进行主观评价。结果IQMR-VWI的客观评价指标均高于LR-VWI,差异有统计学意义(SSIM:0.6959 vs 0.6328;PSNR:26.1648 vs 25.1982;P<0.001)。IQMR-VWI及HR-VWI的定性评分均优于LR-VWI,差异具有统计学意义(P<0.001),而IQMR-VWI与HR-VWI之间的定性评分差异无统计学意义。同时IQMR-VWI较常规HR-VWI成像时间缩短约77%(1 min 55 s vs 8 min 20 s)。结论IQMR可以显著改善快速LR-VWI的图像质量和缩短成像时间,有利于促进颅内血管壁磁共振成像序列在急性缺血性卒中中的临床应用。展开更多
Optimizing the energy utilization of nutrients and ensuring maximum benefits are continuous goals for livestock producers.The net energy(NE)value of feed reflects its nutritional value in the precision feeding system....Optimizing the energy utilization of nutrients and ensuring maximum benefits are continuous goals for livestock producers.The net energy(NE)value of feed reflects its nutritional value in the precision feeding system.An experiment was conducted to determine the apparent metabolizable energy(AME)and NE values of 3 types of dephenolized cottonseed protein(DCP)for Hy Line Brown hens aged 42 to 45 weeks using the reference diet substitution method.A reference diet based on corn soybean meal was used to meet the nutritional needs of Hy Line Brown laying hens.To render the crude protein and energy values of the 3 test diets similar,10.5%,12%,and 16%of the gross energy yielding ingredients from the reference diet were replaced with DCP 1,DCP 2,and DCP 3,respectively.The birds were fed 4 diets during a 7-d adaptation period.After the dietary adaptation period,2 birds per replicate from each treatment group were placed in an individual open circuit respiratory calorimetry chamber for a 3-d experimental period.Daily O_(2)consumption and CO_(2)production were recorded,and excreta samples were collected.The AME values of DCP 1,DCP 2,and DCP 3 were 3,049.05,2,820.13,and 2,982.31 kcal/kg of dry matter(DM),respectively.The NE values of DCP 1,DCP 2,DCP 3 were 1,475.77,1,910.31,and 1,905.37 kcal/kg of DM,respectively,and the NE:AME ratios were 48.40%,67.74%,and 63.89%,respectively.Our data show that the AME value of DCP does not reflect the nutritional value of the feed.The NE value of DCP with a high ME value was not necessarily high.展开更多
Unmanned aerial vehicles(UAVs)may be subjected to unintentional radio frequency interference(RFI)or hostile jamming attack which will lead to fail to track global navigation satellite system(GNSS)signals.Therefore,the...Unmanned aerial vehicles(UAVs)may be subjected to unintentional radio frequency interference(RFI)or hostile jamming attack which will lead to fail to track global navigation satellite system(GNSS)signals.Therefore,the simultaneous realization of anti-jamming and high-precision carrier phase difference positioning becomes a dilemmatic problem.In this paper,a distortionless phase digital beamforming(DBF)algorithm with self-calibration antenna arrays is proposed,which enables to obtain distortionless carrier phase while suppressing jamming.Additionally,architecture of high precision Beidou receiver based on anti-jamming antenna arrays is proposed.Finally,the performance of the algorithm is evaluated,including antenna calibration accuracy,carrier phase distortionless accuracy,and carrier phase measurement accuracy without jamming.Meanwhile,the maximal jamming to signal ratio(JSR)and real time kinematic(RTK)positioning accuracy under wideband jamming are also investigated.The experimental results based on the real-life Beidou signals show that the proposed method has an excellent performance for precise relative positioning under jamming when compared with other anti-jamming methods.展开更多
文摘Focusing on the Yangtze River economic zone,the previous geological researches are systematically summarized,resources and environment conditions and major geological problems which are needing to be concerned in land planning and construction are studied.The results show that the resource conditions of cultivated land,shale gas,geotherm,lithium and so on are superior in the Yangtze River economic zone,and the resources and environment conditions are conducive to develop the modern agriculture,clean energy industry and strategic emerging industries.3×1013 m^2 farmlands without heavy metal pollution are concentrated;there are three national level shale gas exploration and development bases with explored reserves of 5.441×1011 m^3;geothermal availability is 2.4×109 t of standard coal each year,equivalent to 19% of the amount of coal in 2014;Asia's largest energy lithium metal ore deposit is found.In some parts of Yangtze River economic zone,there are some major geological problems such as active faults,karst collapse,ground subsidence,landslide-collapse-debris flow,affecting the river-crossing channels,high-speed railway,urban agglomeration and green ecological corridor planning and construction.Those problems should be concerned,and the relevant suggestions and countermeasures are put forward.Meanwhile,the ideas to further support the development of the Yangtze River economic zone are put forward.
文摘This study aimed to improve egg-laying performance in incubating Magang geese of Guangdong origin and Landaise geese of French origin. In experiment 1, 50 adults, egg-laying Magang geese were inoculated intramuscularly （i.m.） on days 0, 22, and 45 with 1 mL of immunogen containing 1 mg of recombinant chicken inhibin fusion protein. Immunization significantly increased blood antibody titers against inhibin fusion protein, but did not affect the egg-laying performance within 10 days after the first inoculation. From day 15, the egg-laying rate in inhibin-immunized group increased and was significantly higher than the values of control geese from day 40 to 55. However, the reverse was true from day 55 to 75 when more immunized geese developed incubation. In the entire 120 days of the experiment, the immunized geese laid 17.3 eggs in contrast to 16.4 eggs laid by the control geese. From day 30 till the end of the experiment, weight of eggs in the control geese was significantly greater than that in inhibin-immunized birds. In experiment 2, 40 Landaise geese were immunized against inhibin, as described in experiment 1. These geese laid 9.0 eggs on average in contrast to 7.3 eggs laid by nonimmunized control geese over 90 days of egg laying. The above results demonstrated that immunization against recombinant chicken inhibin fusion protein improved egg-laying performance in geese, and the increment was higher in nonincubating geese.
文摘目的探讨智能快速磁共振(IQMR)在提高颅内三维血管壁磁共振成像(VWI)图像质量及缩短扫描时间中的应用价值。方法2022年12月至2023年2月收集29名健康志愿者,均接受快速低分辨率(LR-VWI)和常规高分辨率(HR-VWI)颅内VWI序列扫描,应用IQMR对LR-VWI进行后处理得到IQMR-VWI,并记录成像时间。选取峰值信噪比(PSNR)和结构相似性(SSIM)两个指标进行图像质量客观评价,这两个指标的结果皆是以HR-VWI为参照,分别对LR-VWI及IQMR-VWI测量而得出。由两名放射科医师使用李克特5分量表(Likert scale)在对图像类型(LR-VWI、IQMR-VWI、HR-VWI)不知情的情况下对血管壁的质量和图像整体质量进行主观评价。结果IQMR-VWI的客观评价指标均高于LR-VWI,差异有统计学意义(SSIM:0.6959 vs 0.6328;PSNR:26.1648 vs 25.1982;P<0.001)。IQMR-VWI及HR-VWI的定性评分均优于LR-VWI,差异具有统计学意义(P<0.001),而IQMR-VWI与HR-VWI之间的定性评分差异无统计学意义。同时IQMR-VWI较常规HR-VWI成像时间缩短约77%(1 min 55 s vs 8 min 20 s)。结论IQMR可以显著改善快速LR-VWI的图像质量和缩短成像时间,有利于促进颅内血管壁磁共振成像序列在急性缺血性卒中中的临床应用。
文摘高血压病是严重危害人类健康的心血管疾病之一,虽然国内外有大量流行病学研究分析温度与血压之间关系,但是相关的综述却很少。该文对国内外发表的关于温度与血压之间关系的流行病学研究资料进行综述。联机检索数据库包括Pub Med、Web of Science、Science Direct、CNKI、万方,甄选的方法采用关键词和相关参考文献追溯等途径,收集1980—2016年国内外发表的关于温度与血压关系的所有流行病学文献。共检索到符合要求的文献31篇,关注温度对血压影响的研究26篇,极端低温对血压影响的研究3篇,极端高温对血压影响的研究2篇。多数研究证明温度与血压呈负相关关系,部分研究结果发现温度对血压变化的影响存在温度阈值,其中,一些研究结果显示在高于温度阈值时,温度与血压才呈负相关关系;另一些研究结果显示在低于温度阈值时,温度与血压呈负相关关系,高于温度阈值时,温度与血压呈正相关关系。关于亚人群易感性的分析仍存在争议,需要未来研究进一步予以确认。
基金supported by the Jilin Academy of Agricultural Sciences (CXGC202107GH,CXGC202003GH)China Agriculture Research System (CARS-41-G11)+1 种基金Shandong Provincial Key Research and Development Program(2019JZZY020602)the Feedstuffs Net Energy Evaluation Funding provided by Huayu Agri-Tech Co.Ltd.
文摘Optimizing the energy utilization of nutrients and ensuring maximum benefits are continuous goals for livestock producers.The net energy(NE)value of feed reflects its nutritional value in the precision feeding system.An experiment was conducted to determine the apparent metabolizable energy(AME)and NE values of 3 types of dephenolized cottonseed protein(DCP)for Hy Line Brown hens aged 42 to 45 weeks using the reference diet substitution method.A reference diet based on corn soybean meal was used to meet the nutritional needs of Hy Line Brown laying hens.To render the crude protein and energy values of the 3 test diets similar,10.5%,12%,and 16%of the gross energy yielding ingredients from the reference diet were replaced with DCP 1,DCP 2,and DCP 3,respectively.The birds were fed 4 diets during a 7-d adaptation period.After the dietary adaptation period,2 birds per replicate from each treatment group were placed in an individual open circuit respiratory calorimetry chamber for a 3-d experimental period.Daily O_(2)consumption and CO_(2)production were recorded,and excreta samples were collected.The AME values of DCP 1,DCP 2,and DCP 3 were 3,049.05,2,820.13,and 2,982.31 kcal/kg of dry matter(DM),respectively.The NE values of DCP 1,DCP 2,DCP 3 were 1,475.77,1,910.31,and 1,905.37 kcal/kg of DM,respectively,and the NE:AME ratios were 48.40%,67.74%,and 63.89%,respectively.Our data show that the AME value of DCP does not reflect the nutritional value of the feed.The NE value of DCP with a high ME value was not necessarily high.
基金supported by the Key Research and Development Program of Science&Technology Department of Sichuan Province(2021YFG0155)the Technical Innovation Fund of Southwest China Institute of Electronic Technology(H21004.2).
文摘Unmanned aerial vehicles(UAVs)may be subjected to unintentional radio frequency interference(RFI)or hostile jamming attack which will lead to fail to track global navigation satellite system(GNSS)signals.Therefore,the simultaneous realization of anti-jamming and high-precision carrier phase difference positioning becomes a dilemmatic problem.In this paper,a distortionless phase digital beamforming(DBF)algorithm with self-calibration antenna arrays is proposed,which enables to obtain distortionless carrier phase while suppressing jamming.Additionally,architecture of high precision Beidou receiver based on anti-jamming antenna arrays is proposed.Finally,the performance of the algorithm is evaluated,including antenna calibration accuracy,carrier phase distortionless accuracy,and carrier phase measurement accuracy without jamming.Meanwhile,the maximal jamming to signal ratio(JSR)and real time kinematic(RTK)positioning accuracy under wideband jamming are also investigated.The experimental results based on the real-life Beidou signals show that the proposed method has an excellent performance for precise relative positioning under jamming when compared with other anti-jamming methods.
