检索结果-南通市图书馆

Low Ca diet leads to increased Ca retention by changing the gut flora and ileal pH value in laying hens

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2023年第2期13卷 270-281页

作者： Sha Jiang xinyu Zou Miao mao Mi Zhang Wenjun Tu Meilan Jin Joint International Research Laboratory of Animal Health and Animal Food Safety College of Veterinary MedicineSouthwest UniversityChongqing400715China Immunology Research Center Medical Research InstituteSouthwest UniversityChongqing402460China Laboratory Animal Center Southwest UniversityChongqing400715China

Osteoporosis is a common degenerative metabolic bone disease in caged laying *** egg production mobilizing large amounts of Ca from bone for eggshell formation,consequently leading to Ca deficiency,has been recognized as a critical factor causing osteoporosis in commercial laying *** aim of this study was to examine the effect of Ca deficiency on the function of the gut microbiotaebone axis and related egg production traits and bone health in laying ***-four 48-week-old laying hens were fed a control diet(Control,3.72%)or a low Ca diet(LC,2.04%)for 60 d(n=12).Compared to the Control hens,the LC hens had higher levels of alkaline phosphatase and tartrate resistant acid phosphatase(P<0.05)with lower bone strength,eggshell thickness,and eggshell strength(P<0.05).In addition,the LC hens had higher plasma estradiol concentrations,while having lower concentrations of interleukin-1(IL-1)and *** LC hens also had a lower pH value in the ileum with an increased Ca *** principal co-ordinates analysis showed significantly separate cecal microbiota populations between the Control and LC *** Prevotellaceae_UCG-001,Subdoligranulum,Peptococcus,and Eubacterium_hallii_group(P<0.05)were higher,while the CHKC1001 and Sutterella(P<0.05)were lower at the genus level in the LC *** addition,Prevotellaceae_UCG-001,Subdoligranulum and Eubacter-ium_hallii_group had a negative correlation,while Sutterella was positively correlated with ileal pH *** transcriptome analysis revealed that the low Ca diet caused 20 and 31 genes to be signifi-cantly up-and down-regulated,*** gene expressions of cystic fibrosis transmembrane conductance regulator,solute carrier family 26 member 3 of the anion exchangers,and mitogen-activated protein kinase 12 of pro-inflammatory factors were lower in the LC birds,which was corre-lated with the lower ileal pH *** results suggest that the hens with low Ca diet-induced osteoporosis have an incr

关键词： Low Ca diet Ca retention Microbiota Transcriptional profiling Hen

半水硫酸钙晶须水化质量分数对其水化能力的影响研究

在线全文

学校读者我要写书评

暂无评论

化工矿物与加工 2021年第2期50卷 57-60页

作者：毛欣钰王宇斌马晓晓李淑芹王鑫西安建筑科技大学资源工程学院

半水硫酸钙晶须的水化能力对其应用有较大影响,为掌握半水硫酸钙晶须水化质量分数对其水化能力的影响规律,对半水硫酸钙晶须在不同水化质量分数下的水化过程进行了研究。在此基础上,采用XRD、SEM等对晶须水化产物进行了表征,结果表明:... 详细信息

半水硫酸钙晶须的水化能力对其应用有较大影响,为掌握半水硫酸钙晶须水化质量分数对其水化能力的影响规律,对半水硫酸钙晶须在不同水化质量分数下的水化过程进行了研究。在此基础上,采用XRD、SEM等对晶须水化产物进行了表征,结果表明:随着半水硫酸钙晶须水化质量分数的增大,其水化速度减慢;当半水硫酸钙晶须水化质量分数为1.0%时,水化产物的长径比为6;当水化质量分数为10.0%时,水化产物的长径比为30左右。水化质量分数的增大不利于半水硫酸钙晶须水化的原因在于:随着水化质量分数的增大,溶液的黏度也增大,不仅阻碍了水分子向晶须表面的扩散,还增大了晶须表面钙离子和硫酸根离子向溶液中扩散的阻力,这不利于晶须的断裂。此外,水化质量分数的增大还不利于溶液中水分子进入晶须内部与晶须发生水合反应,最终不利于晶须体积的膨胀。研究结果对调控半水硫酸钙晶须的水化能力有一定的参考意义。

关键词：半水硫酸钙晶须水化过程水合物悬浊液水化速率

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

加快推进中国噪声治理体系现代化

科技导报 2024年第6期42卷 42-50页

作者：魏新渝张爱玲毛玉如杨军张丽娟汪婕王世强生态环境部核与辐射安全中心北京102488 中国环境监测总站北京100012 中国科学院声学研究所北京100190

为深入贯彻落实《中华人民共和国噪声污染防治法》(《噪声法》)及相关政策要求,积极回应人民群众对优美环境的新要求新期待,推进噪声治理体系现代化,总结了噪声污染特点及治理方法、党的十八大以来中国噪声治理历程和成效、现代化噪声... 详细信息

为深入贯彻落实《中华人民共和国噪声污染防治法》(《噪声法》)及相关政策要求,积极回应人民群众对优美环境的新要求新期待,推进噪声治理体系现代化,总结了噪声污染特点及治理方法、党的十八大以来中国噪声治理历程和成效、现代化噪声治理体系的要求,结合噪声污染防治形势和挑战,提出了噪声污染防治工作重点建议。指出了《噪声法》及一系列法规政策的完善,标志着中国初步完成了现代化噪声治理体系顶层设计,包括现代化噪声治理制度体系、全生命周期系统化噪声治理体系、标准体系框架以及监测和评价体系的顶层设计,提出中国特色“社会共治”模式。为了推动噪声法律法规制度落地落实,提出了应以问题为导向,进一步完善噪声法规标准体系,构建噪声污染防治领导责任体系、企业责任体系、全民行动体系、监管体系、市场和信用体系,以实现精准治污、科学治污、依法治污,进一步推进噪声治理体系和治理能力现代化。

关键词：噪声污染噪声治理体系噪声治理现代化

概率不确定下考虑偏好的ELECTREⅢ方法研究及应用

在线全文

学校读者我要写书评

暂无评论

南华大学学报（自然科学版） 2024年第1期38卷 53-59页

作者：张新宇毛军军苏元龙安徽大学大数据与统计学院安徽合肥230039

针对概率不确定语言环境下的多属性群决策问题,为了更好地反映多位专家的评价信息对于不同属性的偏好程度,创新性地构建了一个新的属性偏好关系。基于考虑专家评价信息之间的差异程度,提出了差异度的概念与计算方法。首先,对多个专家的... 详细信息

针对概率不确定语言环境下的多属性群决策问题,为了更好地反映多位专家的评价信息对于不同属性的偏好程度,创新性地构建了一个新的属性偏好关系。基于考虑专家评价信息之间的差异程度,提出了差异度的概念与计算方法。首先,对多个专家的评价信息进行汇总,通过计算不同方案之间与不同属性之间的差异度,进而获得所有专家对于每个属性的偏好程度。其次,文章研究了在概率不确定语言环境下解决多属性群决策问题的ELECTREⅢ方法,通过计算方案之间的一致性指数与不一致性指数,构造方案间的级别优先关系,从而对备选方案进行综合排序。最后,通过绿色供应链供应商选择的算例分析及概率不确定语言环境下的其他方法进行比较分析,验证了该环境下ELECTREⅢ方法的适用性与可行性。

关键词：概率不确定语言偏好关系差异度 ELECTREⅢ方法

维普期刊数据库博看期刊

基于决策者偏好构造的概率语言型Z-number多属性决策方法

在线全文

学校读者我要写书评

暂无评论

海南师范大学学报（自然科学版） 2024年第2期37卷 135-143页

作者：王旭婷毛军军张新宇安徽大学大数据与统计学院安徽合肥230601 安徽大学计算智能与信号处理教育部重点实验室安徽合肥230601

由于决策环境的日益复杂,专家评价信息往往会包含专家偏好,因此有必要对专家偏好进行识别与处理。针对这一情况,提出了基于决策者偏好构造的概率语言型Z-number并应用于多属性决策问题中。首先,针对专家偏好未知的情况,提出了一种基于... 详细信息

由于决策环境的日益复杂,专家评价信息往往会包含专家偏好,因此有必要对专家偏好进行识别与处理。针对这一情况,提出了基于决策者偏好构造的概率语言型Z-number并应用于多属性决策问题中。首先,针对专家偏好未知的情况,提出了一种基于修正的平均得分距离,由专家评价信息确定专家偏好。然后,依据得到的专家偏好,利用GOWPA算子与最大熵生成概率语言型Z-number。同时,获得专家评价信息的可信度,由专家可信度聚合专家信息并采用TODIM方法对方案进行排序。最后,在国家大力提倡节能减排的背景下,将所提方法应用于国家绿色矿山试点企业的选取上,验证了所提方法的有效性和可行性。

关键词：概率语言型Z-number 偏好 GOWPA算子最大熵多准则群决策

维普期刊数据库博看期刊

酸性微环境对巨噬细胞中周期生物钟1的表达及M2型极化的影响

在线全文

学校读者我要写书评

暂无评论

贵州医科大学学报 2024年第3期49卷 340-346页

作者：刘新宇赵茂杨颖颖邱炜贵州医科大学生物与工程学院&健康医药现代产业学院贵州贵阳550025

目的探讨酸性微环境对巨噬细胞中周期生物钟1(PER1)的表达及替代途径激活的巨噬细胞(M2型)极化的影响。方法20只6~8周龄C57/6J雌性小鼠,腹腔注射含5%淀粉的生理盐水,连续3 d,麻醉处死,对小鼠腹腔灌流并回收灌流液,接种至6孔板培养2 h,... 详细信息

目的探讨酸性微环境对巨噬细胞中周期生物钟1(PER1)的表达及替代途径激活的巨噬细胞(M2型)极化的影响。方法20只6~8周龄C57/6J雌性小鼠,腹腔注射含5%淀粉的生理盐水,连续3 d,麻醉处死,对小鼠腹腔灌流并回收灌流液,接种至6孔板培养2 h,贴壁细胞即为小鼠腹腔巨噬细胞,分别加pH7.3培养基(pH7.3组)、pH6.5培养基(pH6.5组)及0.02 mol/L乳酸培养基(0.02 mol/L乳酸组),培养24 h;采用实时荧光定量PCR(RT-PCR)检测3组小鼠腹腔巨噬细胞中白细胞介素1β(IL-1β)、血管内皮因子(VEGF)、精氨酸酶-1(ARG-1)、缺氧诱导因子-1α(HIF-1α)及PER1信使RNA(mRNA)的表达,采用酶联免疫吸附剂测定法(ELISA)检测3组小鼠腹腔巨噬细胞中IL-10、IL-12、VEGF、肿瘤坏死因子α(TNF-α)蛋白的水平;溴化三甲基-2,3-二油酰氧基丙基铵(DOTAP)、二油酰基磷酰基乙醇胺(DOPE)、胆固醇、二硬脂酰基磷脂酰乙醇胺-聚乙二醇(2000)-琥珀酰胺(DSPE-PEG2000-NHS)按摩尔比为7∶7∶5∶1溶解于氯仿溶液,使用旋转蒸发仪旋蒸形成脂质体薄膜,加无核酸酶双蒸水采用超声水浴仪和小型挤压器制备单层脂质体,使用无酶水溶解PER1小干扰RNA(siRNA)并与脂质体溶液按照1∶10的质量比于室温下震荡混匀,按照1∶1000体积比加别藻蓝蛋白-甘露糖受体(APC-CD206)抗体得脂质体-PER1复合体(Lipo-PER1)阳离子脂质体,采用透射电子显微镜电镜观察Lipo-PER1复合体形态与结构;B16-F10黑色素瘤细胞和RAW264.7巨噬细胞按1∶1比例共培养,共聚焦显微镜观察B16-F10黑色素瘤细胞和RAW264.7巨噬细胞对Lipo-PER1的摄取;对数期生长的RAW264.7巨噬细胞分别加Lipo-PER1、脂质体-阴性对照(Lipo-NC)复合体,培养6 h,采用RT-PCR和ELISA法检测2组RAW264.7巨噬细胞中IL-1β、抗原分化簇86(CD86)、ARG-1、L-10 mRNA及TNF-α、转化生长因子-β(TGF-β)蛋白的表达。结果与pH7.3组对比,pH6.5组和0.02 mol/L乳酸组小鼠腹腔巨噬细胞IL-1βmRNA表达下调(P<0.05),ARG-1、VEGF、HIF-1α及PER1mRNA表达上调(P<0.05),IL-12、TNF-α蛋白水平减少(P<0.0001),IL-10、VEGF蛋白水平增加(P<0.01);透射电镜与共聚焦显微镜观测结果表明,Lipo-PER1构建成功并能成功被巨噬细胞摄取;与Lipo-NC组比较,Lipo-PER1组RAW264.7巨噬细胞中I L-1β、CD86 mRNA表达上调(P<0.05或P<0.001),ARG-1、IL-10 mRNA表达下调(P<0.01或P<0.05),TGF-β蛋白表达增加(P<0.0001),TNF-α蛋白表达减少(P<0.05)。结论酸性微环境能上调巨噬细胞中PER1的表达,进而促进巨噬细胞M2型极化。

关键词：巨噬细胞脂质体周期生物钟1 酸性微环境极化阳离子脂质体小干扰RNA

基于不同算法的磁化水水洗去除飞灰中可溶性氯盐浸出率预测模型

在线全文

学校读者我要写书评

暂无评论

化工矿物与加工 2022年第1期51卷 44-48页

作者：李淑芹王宇斌毛欣钰马晓晓华开强西安建筑科技大学资源工程学院

为掌握不同磁化参数对飞灰中可溶性氯盐浸出率的影响规律,基于正交试验方法进行飞灰中可溶性氯盐的磁化水水洗去除试验,并建立正交多项式回归及随机森林两种预测模型,结果表明,随机森林模型的预测值与试验值的误差为±2.90%,正交多项式... 详细信息

为掌握不同磁化参数对飞灰中可溶性氯盐浸出率的影响规律,基于正交试验方法进行飞灰中可溶性氯盐的磁化水水洗去除试验,并建立正交多项式回归及随机森林两种预测模型,结果表明,随机森林模型的预测值与试验值的误差为±2.90%,正交多项式回归模型的预测值与试验值的误差为±6.36%,随机森林模型相较正交多项式回归模型预测精度高。随机森林算法得出的影响可溶性氯盐浸出率的特征重要性排序为:线圈匝数、波形、电流频率、固液比和磁化时间。该研究成果可对飞灰中可溶性氯盐的去除效果进行精确预测并为现场生产提供理论依据。

关键词：飞灰水洗磁化水可溶性氯盐随机森林模型正交多项式回归模型

Optimized design and test for a pendulum suspension of the crop spray boom in dynamic conditions based on a six DOF motion simulator

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2018年第3期11卷 76-85页

作者： Longfei Cui Hanping mao xinyu Xue Suming Ding Baiyu Qiao Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013China Nanjing Research Institute for Agricultural Mechanization Ministry of AgricultureNanjing 210014China

Spray deposit distribution from a field sprayer is mainly affected by the boom movements when the tractor is driven over a rough soil surface,the pendulum suspension that used to reduce and control the movement of spray boom by isolating the boom from vibrations of the tractor will directly enhance uniform deposition of ***,how to match the parameters of the suspension with the properties of the boom is the key *** dynamic rigid-flexible coupling model of the virtual prototype of the spray boom suspension system was established by using ADAMS and ABAQUS *** optimization of the suspension parameters for a large spay boom was carried out based on the optimal Latin hypercube design,radial basis function neural network,and multi-objective genetic algorithm *** modified parameters of the suspension,the travel of the sprayer on a typical field motion track was simulated based on a six DOF motion simulator,and the dynamic behavior of the boom suspension was *** results show that RMS of the measured boom roll angle and the boom center displacement for optimized solution were reduced by 14.76%and 12.43%compared with the original ***,the inertial measurement unit(IMU)was used to measure the movements of the sprayer vehicle during the pesticide application on the Hongze Lake Farm,the experiment of field condition reproduced by using the six DOF motion simulator,the standard deviation of the roll angle and vibration displacement for the optimized sprayer boom are only 0.6382°and 62.279 mm *** research provides theoretical basis and experimental method for parameter optimization of large scale boom suspension.

关键词： boom sprayer pendulum suspension parameter optimization spray boom movement spray deposit distribution six DOF motion simulator

Design and experiment of electro hydraulic active suspension for controlling the rolling motion of spray boom

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2019年第4期12卷 72-81页

作者： Longfei Cui xinyu Xue Feixiang Le Hanping mao Suming Ding Nanjing Research Institute for Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013China

Boom sprayer is one of the most commonly used plant protection machinery for spraying *** have shown that the efficiency of chemicals is highly correlated with the uniformity of spray distribution *** the boom is a large and flexible structure,boom rolling leads to overlapping and leakage of the *** order to improve spray uniformity,the boom attitude should be kept parallel to the ground slope or to the crop canopy beneath the *** suspension can attenuate frequencies above its resonance frequency,but nothing can be done to align the boom to the sloping ***,an active suspension system is designed,which includes DSP-based controller,a servo valve,a hydraulic cylinder,two ultrasonic sensors,one inertial attitude sensor,and the developed control *** order to prevent the wrong response of the control system caused by the high frequency component due to uneven crop canopy or rough ground.A special signal processing algorithm was proposed,including the limiting filter,smoothing algorithm and data fusion algorithm based on optimal *** transient and steady-state performances of the boom control system using velocity feedforward PID algorithm were tested on a six DOF motion *** can be seen that the low-frequency tracking performance of the boom was greatly improved after the electro-hydraulic active suspension was *** the resonance frequency,the peak angle of active suspension and passive suspensions are 0.72°and 1.29°respectively,and the resonance peak is greatly *** controller was implemented on a self-propelled boom sprayer and validated under field conditions,the standard deviation of the roll angle of the boom with active suspension is 0.40°,compared with 1.04°of the sprayer *** results show that the active suspension control system can effectively reduce the effect of ground excitation disturbance on the application process,and has good tracking performance for

关键词： boom sprayer active suspension electro-hydraulic servo system six DOF motion simulator signal process motion control