一类二维加权积分数值求积方法及其误差分析

针对一类二维加权积分的数值计算方法及误差分析进行研究,参照一维广义高斯积分数值求积方法提出一种具有较高代数精度的计算方法并对其误差做分析,同时给出几个简明的结果。这些结果可用到诸如小波分解,图像处理与多分辨数字信号处理等领域。     

苏氨酸和异亮氨酸对皖西白鹅屠宰性能、器官指数及肠道形态结构、消化酶活性、抗氧化和免疫指标的影响

本试验旨在研究苏氨酸和异亮氨酸对皖西白鹅屠宰性能、器官指数及肠道形态结构、消化酶活性、抗氧化和免疫指标的影响。选取30日龄体重相近的皖西白鹅180只,随机分为3组,每组3个重复,每个重复20只。对照组饲喂基础饲粮,苏氨酸组在基础饲粮中添加2.0 g/kg的L-苏氨酸,异亮氨酸组在基础饲粮中添加2.5 g/kg的L-异亮氨酸。试验期60 d。结果表明：1）各组之间90日龄屠宰性能和器官指数无显著差异（P>0.05）。2）异亮氨酸组60日龄十二指肠和空肠绒毛高度、隐窝深度显著或极显著高于对照组（P<0.05或P<0.01）,苏氨酸组60日龄十二指肠、空肠和回肠隐窝深度及90日龄十二指肠和回肠绒毛高度显著或极显著高于对照组（P<0.05或P<0.01）。3）苏氨酸组和异亮氨酸组60、90日龄十二指肠胰蛋白酶活性极显著高于对照组（P<0.01）,苏氨酸组60、90日龄十二指肠麦芽糖酶活性及90日龄空肠淀粉酶、乳糖酶活性显著或极显著高于对照组（P<0.05或P<0.01）。4）异亮氨酸组60日龄空肠总抗氧化能力显著高于对照组和苏氨酸组（P<0...     

盐胁迫对5份无芒雀麦苗期生长和生理生化的影响及综合性评价

为了明确不同无芒雀麦苗期耐盐能力的强弱,本研究选择5份不同株型的无芒雀麦作为供试材料。根据新疆土壤盐碱成分设置中性盐(M盐)：NaCl∶Na₂SO₄∶Na₂CO₃=1∶4∶0和碱性盐(A盐)：NaCl∶Na₂SO₄∶Na₂CO₃=1∶1∶8两种处理,于三叶期每盆一次性浇灌2 L电导率(EC)为20 ms·cm^-1的盐处理液,CK浇灌等量自来水。处理30 d后测定生长指标、叶绿素荧光特性参数、丙二醛(MDA)和渗透调节物质含量,并通过相关性分析、主成分分析、隶属函数分析对13个指标进行分析评价。结果表明：除F_v/F_m和F_v/F_o外,盐胁迫显著影响其余11个指标,且5份材料间差异显著(P<0.05);5份无芒雀麦的株高、茎粗、分蘖数、地上生物量、根冠比、MDA和脯氨酸含量在不同盐胁迫下表现出不同的适应变...     

Mental health in the veterinary profession: an individual or organisational focus?

The veterinary profession is experiencing a shortage of veterinarians, with attrition recognised as a substantial contributor. Research has also indicated increased levels of mental ill health and alarming suicide rates in practitioners. The primary aim of this study was to investigate the impact of eleven modifiable workplace factors on mental health outcomes, job appreciation and intention to leave the veterinary profession. The second aim was to ascertain whether workplace factors influence mental health outcomes after controlling for individual resilience. An online survey was completed by 73 practising Australian veterinarians. Unfavourable workplace factors correlated with adverse outcomes including depression, stress, reduced job appreciation and increased likelihood of leaving both the role and the profession. Workplace factors remained linked with the outcomes of job appreciation, depression and stress whilst controlling for practitioner resilience. Job appreciation was a significant predictor of intention to leave both the current role and the profession. Via multiple linear regression, two categories were identified as associated with improved psychological outcomes and job appreciation. These were workplace factors that represent breaks from workload and control or decision latitude in the workplace. Whilst resilience represents a key area for intervention, workplace factors potentially represent an easier-to-modify area for intervention.     

玉米种衣剂配方数学模型筛选研究

采用二次回归旋转组合设计方法 ,对玉米种衣剂优化配方进行研究。通过利用计算机技术对试验数据进行处理和模拟寻优 ,建立了产量函数模型 ,筛选出产量≥ 975 0kg hm2 的最佳配方组合方案 ,并确定了置信域。     

环境污染对农业生态系统服务功能影响

农业生态系统服务功能是农业生态过程和人类活动所形成的人类赖以生存的自然环境条件与效用. 城市污染物排放增加, 农业化学品污染加重, 农村畜禽粪尿污染成灾以及乡镇企业污染发展影响了农业生态系统有机质生产, 降低了农业产品品质, 减弱了土壤生态过程, 破坏了生物多样性, 减弱了气候调节与减灾功能, 减少了动物传粉与有害生物控制效应七项生态服务功能. 遏止环境污染是保护农业生态系统服务功能的关键.     

功能性杂粮膨化食品的研制

选用苦荞、燕麦、杂豆等山西特色杂粮为主要原料,有针对性地强化苦荞的黄酮、燕麦膳食纤维等功能性营养因子,研制出可降低血脂、调节血压和润肠通便等专用系列杂粮膨化保健食品。     

ICAI Realizaltion for the K-map Simplification of Logical Function

Based on the theory of the K map simplification of logical function(KSLF),this article releases a ICAI Realization for KSLF.Providing three kinds of teaching style:commonness, teaching, practice.This product,wich supports for the K map simplification with random item,is not only helpful to the construction of the curriculum of digital circuit ,but also to the design for digital application system.Under the practice method, This product's guides,checks,and corrects the student's whole process forthe proceeding of KSLF automaticly under the teaching method.