农产品对外贸易与农业生态效率:机制路径与空间溢出效应分析

以2009—2020年省级面板数据为样本,采用SBM模型测算了中国30个省份的农业生态效率,并构建多种计量模型进行实证检验。结果发现:(1)农产品对外贸易有助于提升农业生态效率,通过稳健性与内生性检验,证实结论具有可靠性。(2)异质性检验发现,进口贸易对农业生态效率的影响要强于出口;东部地区的影响程度高于中西部地区。(3)农业技术进步发挥出中介效应,是农产品对外贸易提升农业生态效率的机制渠道。考虑到空间因素,农产品对外贸易通过空间溢出作用,对周边地区农业生态效率存在促进作用。(4)农产品对外贸易对农业生态效率存在非线性影响,农村人力资本水平充当了门槛,具有双重门槛特征,门槛值分别为6.263、7.642。当农村人力资本水平低于6.262时,农产品对外贸易对农业生态效率影响为0.037%;介于6.263到7.642区间时,影响为0.038%;越过门槛值7.642时,影响为0.039%,呈现递增态势。基于此,要进一步优化农产品对外贸易结构、谋求贸易高质量发展,为促进农业可持续发展蓄势赋能。

基于地震属性堆叠泛化集成学习的辫状河储层构型表征——以渤海湾盆地C-2油田为例

C-2油田是位于渤海湾盆地的河流相海上油田,主要采用水平井开发,储层厚度薄、纵向多期砂体叠置、横向相变快,储层内部结构与连通关系复杂,受复杂的储层结构与井震资料的双重影响,稀疏井网条件下储层描述难度大,制约了油田精细挖潜效果,常规地震反演难以满足薄储层高分辨率预测与储层内部结构精细解剖的需要。针对研究油田辫状河储层结构特征,采用基于地震属性堆叠泛化集成学习的方法完成河流相复杂结构储层的预测,相较于单一的机器学习模型提高了预测精度。综合地质、地球物理与油藏动态等多维信息进行迭代优化,进一步降低地下储层预测与结构认识的不确定性,实现了研究区辫状河复杂结构储层的精细表征,为油田剩余油与潜力砂体精细挖潜提供了依据。研究表明:基于地震属性堆叠泛化集成学习的储层预测方法,不仅能有效提高地震纵向分辨率,同时具有较强的横向“相控”指示能力,预测结果包括砂体叠置关系与储层内部结构特征,更加适用于相变快、储层空间建筑结构复杂的陆相河流沉积体系储层预测与精细刻画,可为稀疏井网海上油田开发中后期河流相沉积储层构型精细表征提供借鉴。

无鱼粉无豆粕饲料中补充蛋氨酸对鲤生长性能、氮循环和氨基酸沉积率的影响及补充晶体氨基酸饲料的投喂策略

本试验旨在研究无鱼粉无豆粕饲料中补充蛋氨酸对鲤生长性能、氮循环和氨基酸沉积的影响,以及投喂频率和补充蛋氨酸对鲤餐后血浆氨基酸含量的影响。选取初始体重为27 g的鲤幼鱼540尾,随机分为2组(每组9个重复,每个重复30尾),分别投喂添加0(C组)和3 g/kg蛋氨酸(DL-蛋氨酸形式,纯度为98%)(M组)的无鱼粉无豆粕饲料,2种试验饲料中蛋氨酸含量分别为3.85和6.83 g/kg饲料(1.14和1.99 g/16 g N),进行为期8周的生长试验。生长试验结束后称重,采样后继续进行1周的投喂频率试验。投喂频率试验中,将C组和M组试验鱼分别随机分为3组,投喂频率分别为1、2和3次,共6组,每组3个重复,每个重复25尾。采集餐后不同时间点血浆样品,测定血浆游离氨基酸含量。结果显示:1)在无鱼粉无豆粕饲料中补充蛋氨酸显著提高了鲤的总摄食量、特定生长率和蛋白质效率(P<0.05),显著降低了摄食率和饲料系数(P<0.05);2)与C组相比,M组鲤氮摄入量从54.33 g/桶显著提高到60.73 g/桶(P<0.05),但氮排放量从41.08 g/桶显著降低到37.93 g/桶(P<0.05),各氨基酸以及总必需氨基酸和总非必需氨基酸沉积率均显著提高(P<0.05),血浆尿素氮和总胆固醇含量显著下降(P<0.05);3)投喂频率达到3次时,饲料中补充蛋氨酸可显著提高鲤血浆蛋氨酸、赖氨酸曲线下面积(AUC)(P<0.05)。综上所述,在无鱼粉无豆粕饲料中补充蛋氨酸至鲤需求量,在日投喂3次的养殖模式下,鲤的生长性能得到显著改善,饲料效率和氮沉积率显著提高,说明提高投喂频率是提高晶体氨基酸利用率的有效方法。

六种常用血清学诊断模型对成人乙型肝炎e抗原阳性患者肝纤维化的诊断价值比较

目的比较六种常用血清学诊断模型对成人乙型肝炎e抗原阳性患者肝纤维化的诊断价值。方法选取山东省淄博市中心医院和中国人民解放军总医院第六医学中心2018年1月至2023年6月诊断为慢性乙型肝炎并行肝病理组织活检的265例患者为研究对象。采集临床常用的球蛋白与血小板比值(GPR)、纤维化4因子指数(FIB-4)、天冬氨酸转氨酶-血小板比率指数(APRI)、天冬氨酸转氨酶与丙氨酸转氨酶比值(AAR)、纤维化硬化指数(FCI)、S指数(S-index)六种血清学诊断模型的相关指标,以肝组织穿刺活检结果为“金标准”,应用受试者操作特征曲线评估六种模型的诊断效能。结果F1~F4期年龄、血小板计数、丙氨酸转氨酶、天冬氨酸转氨酶、碱性磷酸酶、γ-谷氨酰转肽酶、白蛋白、APRI、FIB-4、GPR、S-index和FCI比较,差异有统计学意义(P<0.05)。区分F_(1)~F_(4)时,GPR、APRI、FIB-4、FCI和S-index模型的曲线下面积均>0.70,AAR模型曲线下面积的95%CI为0.50。区分F_(1)与F_(2)~F_(4)、F_(1)~F_(2)与F_(3)~F_(4)、F_(1)~F_(3)与F_(4)时,GPR、APRI、FIB-4、FCI和S-index模型的曲线下面积均大于AAR模型(P<0.05)。结论FIB-4、GPR、S-index和FCI均能较好地区分乙型肝炎e抗原阳性慢性乙型肝炎患者肝纤维化的严重程度,APRI区分效能则按F_(1)~F_(4)的顺序呈逐渐降低趋势,AAR基本不能对肝纤维化的严重程度作出判断。

基于形函数的非一致网格接触修形新方法

针对接触压力分布不均导致机械零部件过早失效的问题,提出了一种非一致网格接触修形新方法。基于单元形函数和“虚拟节点”建立了非一致网格接触节点之间的力学关系,推导得到了节点修形量与接触压力之间的数学方程,提出了一种通过最小化最大接触压力求解修形量的极小极大模型,并根据其数学特点将该模型转换为线性规划模型,提高了修形量计算的效率和全局收敛性。通过三个弹性接触修形实例,验证了该方法对一般弹性接触修形问题的适用性和有效性。

Climate-growth relationships of Pinus tabuliformis along an altitudinal gradient on Baiyunshan Mountain,Central China

A set of standard chronologies for tree-ring width(TRW),earlywood width(EWW)and latewood width(LWW)in Pinus tabuliformis Carr.along an altitudi-nal gradient(1450,1400,and 1350 m a.s.l.)on Baiyunshan Mountain,Central China to analyze the effect of varying temperature and precipitation on growth along the gradi-ent.Correlation analyses showed that at all three altitudes and the TRW and EWW chronologies generally had signifi-cant negative correlations with mean and maximum tem-peratures in the current April and May and with minimum temperatures in the prior July and August,but significant positive correlations with precipitation in the current May.Correlations were generally significantly negative between LWW chronologies and all temperatures in the prior July and August,indicating that the prior summer temperature had a strong lag effect on the growth of P.tabuliformis that increased with altitude.The correlation with the standard-ized precipitation evapotranspiration index(SPEI)confirmed that wet conditions in the current May promoted growth of TR and EW at all altitudes.Significant altitudinal differences were also found;at 1400 m,there were significant positive correlations between EWW chronologies and SPEI in the current April and significant negative correlations between LWW chronologies and SPEI in the current September,but these correlations were not significant at 1450 m.At 1350 m,there were also significant negative correlations between the TRW and the EWW chronologies and SPEI in the prior October and the current July and between LWW chronology and SPEI in the current August,but these cor-relations were not significant at 1400 m.Moving correlation results showed a stable response of EWW in relation to the SPEI in the current May at all three altitudes and of LWW to maximum temperature in the prior July-August at 1400 m from 2002 to 2018.The EWW chronology at 1400 m and the LWW chronology at 1450 m were identified as more suitable for climate reconstruction.These results provide a strong scientific basis for forest management decisions and climate reconstructions in Central China.

侯爱画治疗肿瘤化学疗法毒副作用的辨证用药经验

介绍侯爱画教授治疗肿瘤化学疗法毒副作用的辨证用药经验。其应用扶正护膜汤治疗骨髓抑制;基于“五脏六腑皆令人呕”理论,灵活辨治恶心、呕吐;运用白及、乌梅、海螵蛸、瓦楞子护膜制酸,引火汤、吴茱萸引火归元治疗消化道黏膜损伤;采用养肝疏肝相结合缓解肝毒性;以益气养血和营为法,内服外洗并施减轻外周神经毒性;善用乌芪汤治疗皮肤瘙痒。

Stability assessment of tree ring growth of Pinus armandii Franch in response to climate change based on slope directions at the Lubanling in the Funiu Mountains,China

Global warming will affect growth strategies and how trees will adapt.To compare the response of tree radial growth to climate warming in different slope directions,samples of Pinus armandii Franch were collected and tree-ring chronologies developed on northern and western slopes from the Lubanling in the Funiu Mountains.Correlation analyses showed that two chronologies were mainly limited by temperatures in the previous June-August and the com-bination of temperatures and moisture in the current May-July.The difference of the climate response to slopes was small but not negligible.Radial growth of the LBLO1 site on the northern slope was affected by the combined maximum and minimum temperatures,while that of the LBLO2 site was affected by maximum temperatures.With regards to moisture,radial growth of the trees on the north slope was influenced by the relative humidity in the current May-July,while on the western slope,it was affected by the relative humidity in the previous June-August,the current May-July and the precipitation in the current May-July.With the change in climate,the effects of the main limiting factors on growth on different slopes were visible to a certain extent,but the differences in response of trees on different slopes gradually decreased,which might be caused by factors such as different slope directions and the change in diurnal temperature range.These results may provide information for forest protection and ecological construction in this region,and a scientific reference for future climate reconstruction.

Microenvironmental effects on growth response of Pinus massoniana to climate at its northern boundary in the Tongbai Mountains,Central China

The Tongbai Mountains is an ecologically sensi-tive region and the northern boundary of Pinus massoniana Lamb.To analyze the effect of different microenvironments on tree growth response to climate factors,we developed standard chronologies for earlywood width(EWW),late-wood width(LWW),and total ring width(TRW)of P.massoniana at two sampling sites on slopes with different orientations,then analyzed characteristics of the chronolo-gies and their correlations with climate variables from five stations in the region and with a regional normalized differ-ence vegetation index(NDVI).Statistical results showed that the TRW/EWW/LWW chronology consistency and charac-teristics(mean sensitivity,signal to noise ratio,expressed population signal)for trees growing on the southeastern slope were much higher than for trees on the northeastern slope.Correlations indicated that temperature in current March and August has a significant positive effect on TRW/EWW/LWW formation,and the effect on the northeastern slope was weaker than on the southeastern slope.Compared to temperature,precipitation has more complicated effects on tree growth,but the effect on the northeastern slope was also generally weaker than on the southeastern slope.Step-wise linear regression analyses showed that temperature in August was the main limiting factor at the two sampling sites.Similarly,the response of tree growth on the southeast-ern slope as determined by the NDVI is better than on the northeastern slope,and the TRW/EWW/LWW chronologies for the southeastern slope explained over 50%of the total NDVI variances in June.Overall,the results indicate that the difference in the climate response of P.massoniana at two sampling sites is clearly caused by differences in the microenvironment,and such differences should be properly considered in future studies of forest dynamics and climate reconstructions.

Stability assessment of tree ring growth of Pinus armandii Franch in response to climate change based on slope directions at the Lubanling in the Funiu Mountains,China

Global warming will affect growth strategies and how trees will adapt.To compare the response of tree radial growth to climate warming in different slope directions,samples of Pinus armandii Franch were collected and treering chronologies developed on northern and western slopes from the Lubanling in the Funiu Mountains.Correlation analyses showed that two chronologies were mainly limited by temperatures in the previous June–August and the combination of temperatures and moisture in the current May–July.The difference of the climate response to slopes was small but not negligible.Radial growth of the LBL01 site on the northern slope was affected by the combined maximum and minimum temperatures,while that of the LBL02 site was affected by maximum temperatures.With regards to moisture,radial growth of the trees on the north slope was influenced by the relative humidity in the current May–July,while on the western slope,it was affected by the relative humidity in the previous June–August,the current May–July and the precipitation in the current May–July.With the change in climate,the effects of the main limiting factors on growth on different slopes were visible to a certain extent,but the differences in response of trees on different slopes gradually decreased,which might be caused by factors such as different slope directions and the change in diurnal temperature range.These results may provide information for forest protection and ecological construction in this region,and a scientific reference for future climate reconstruction.

益肠散结颗粒对结肠癌小鼠肠道菌群及免疫功能的调节作用及机制研究

【目的】观察益肠散结颗粒对结肠癌小鼠肠道菌群及免疫功能的调节作用及机制。【方法】将60只小鼠随机分为6组,即正常组,模型组,益肠散结颗粒低、中、高剂量组,过表达黑色素瘤缺失基因2(AIM2)质粒(pcDNA-AIM2)干预组,每组10只。除正常组,其他各组采用氧化偶氮甲烷(AOM)/葡聚糖硫酸钠(DSS)诱导法制备结肠癌模型。给药后,绘制各组小鼠生存曲线,计算肿瘤体积;酶联免疫吸附分析(ELISA)检测血清中免疫球蛋白(Ig)G、IgM、白细胞介素(IL)-1β和IL-18水平;流式细胞仪检测外周血T细胞CD3^(+)、CD4^(+)、CD8^(+)水平;测定脾指数;苏木素-伊红(HE)染色法观察结肠组织病理学变化;16S-rDNA肠道菌群测序检测肠道菌群α多样性及肠道菌群群落结构;蛋白免疫印迹(Wetsern Blot)法检测结肠组织中AIM2、凋亡相关斑点样蛋白(ASC)、胱天蛋白酶1(caspase-1)蛋白表达。【结果】与正常组比较,模型组小鼠生存率,血清中IgG、IgM水平,外周血中CD3^(+)、CD4^(+)水平和CD4^(+)/CD8^(+)比值,结肠组织AIM2、ASC、caspase-1蛋白表达水平显著降低,肿瘤体积,血清中IL-1β、IL-18水平,外周血CD8^(+)水平,脾指数显著增加(均P<0.05),HE染色结果可见结肠癌组织特征表现;与模型组比较,益肠散结颗粒低、中、高剂量组和pcDNA-AIM2组小鼠生存率,血清中IgG、IgM水平,外周血中T细胞CD3^(+)、CD4^(+)水平和CD4^(+)/CD8^(+)比值,结肠组织AIM2、ASC、caspase-1蛋白表达水平显著升高,肿瘤体积,血清中IL-1β、IL-18水平,外周血CD8^(+)水平,脾指数显著降低(均P<0.05),HE染色结果可见结肠癌组织病理改变减轻。与正常组比较,模型组小鼠Observed指数、Chao1指数、Shannon指数,拟杆菌门、变形菌门、杆菌科、毛螺菌属、瘤胃梭菌属菌落相对丰度显著降低,厚壁菌门、放线菌门和Patescibateria、乳杆菌属、臭杆菌属、别样杆菌属、未培养的瘤胃球菌科和拟杆菌属菌落相对丰度升高(P<0.05);与模型组比较,益肠散结颗粒低、中、高剂量组和pcDNA-AIM2组小鼠Observed指数、Chao1指数和Shannon指数,拟杆菌门、变形菌门、杆菌科、毛螺菌属、瘤胃梭菌属菌落相对丰度显著升高,厚壁菌门、放线菌门和Patescibateria、乳杆菌属、臭杆菌属、别样杆菌属、未培养的瘤胃球菌科和拟杆菌属菌落相对丰度降低(均P<0.05)。【结论】益肠散结颗粒可增强结肠癌小鼠自身免疫力,改善肠道菌群结构,其作用机制与激活AIM2炎性小体有关。

矾贝散结颗粒联合化疗治疗痰瘀互结证结直肠癌肺转移疗效观察

目的观察矾贝散结颗粒联合化疗治疗痰瘀互结证结直肠癌肺转移患者的临床疗效。方法选取2023年8—12月在烟台市中医医院肿瘤科治疗的84例痰瘀互结证结直肠癌肺转移患者,按随机数字表分为治疗组和对照组各42例,对照组采用mFOLFOX6化疗方案治疗,治疗组在对照组治疗基础上联合矾贝散结颗粒口服,2组均以14 d为1个周期,连续治疗8个周期。比较2组患者肿瘤控制疗效及治疗前后中医证候积分、生活质量[采用生命质量测定量表(EORTC)QLQ-C30(V3.0)与KPS评分评定]、免疫功能(CD4^(+)、CD8^(+)、CD4^(+)/CD8^(+))和化疗不良反应发生情况。结果治疗8个周期后,2组患者肿瘤客观缓解率及疾病控制率比较差异均无统计学意义(P均>0.05);治疗组中医证候积分及EORTC QLQ-C30(V3.0)量表中疲倦、疼痛、气促、食欲丧失、腹泻评分明显低于治疗前及对照组(P均<0.05),EORTC QLQ-C30(V3.0)量表中躯体功能、角色功能、情绪功能、总体健康状况评分均明显高于治疗前及对照组(P均<0.05);治疗组KPS评分改善总有效率明显高于对照组[82.05%(32/39)比55.26%(21/38),P<0.05],且CD4^(+)、CD4^(+)/CD8^(+)均明显高于治疗前及对照组(P均<0.05),白细胞下降及腹泻发生的程度均明显低于对照组(P均<0.05)。结论矾贝散结颗粒联合mFOLFOX6化疗方案治疗可明显改善痰瘀互结证结直肠癌肺转移患者的临床症状和机体免疫功能,提高患者生活质量,减轻化疗不良反应。

从“肝体阴而用阳”理论辨治急性肝损伤探析

目前,肝病在我国发生率居高不下,肝损伤作为各种肝病共有的一种病理状态,严重危害人类健康。现代医学常予以保肝、退黄、调脂等治疗。随着近年对中药成分的不断开发,诸多中药展现出保肝优势,并被广泛应用于肝病的治疗当中。本文通信作者侯爱画教授基于“肝体阴而用阳”理论,肝脏中以肝血为体,肝气为用,提出治疗急性肝损伤的过程应养肝血与疏肝气并行,针对湿、热、毒、瘀等致病因素,予以清热利湿、化浊解毒、活血化瘀之法,同时不忘补益脾肾二脏,以治疗多种原因所致的急性肝损伤。

基于“五脏六腑皆令人呕”治疗呕吐证治探讨

胃气不和常致呕吐,然脏腑之病,可各为互传,故五脏六腑皆可令人呕,而非独胃也。五脏六腑病可通过五行生克制化、气血津液运行、经络循行等多种途径影响胃气升降,引发呕吐,可予疏肝理气、益火补土、宣上和中、温中补虚、化气利水、润肠通腑等法,以达和胃止呕之效。

沙地赤松树干边材液流速率的方位特征研究

[目的]确定优良固沙树种沙地赤松(Pinus densiflora)树干边材液流速率(J_s)方位变化规律,探讨环境因素对方位差异的影响。[方法]采用热扩散式树干液流计(TDP)连续监测树干液流并同步监测环境因素,比较分析不同方位树干液流速率的差异、季节动态及与降水、土壤体积含水率(θ)、太阳辐射强度(R_s)间的关系。[结果]表明:(1)在赤松树干东、南、西、北4个方位上,J_s的日变化与季节变化均呈现出基本一致的格局,且均与R_s间表现出紧密的协同变化关系;(2)在中等强度干旱和极端干旱情况下,各方位边材J_s均同步受到明显抑制,在土壤水分得到充分补充后又快速回升;(3)在典型晴日里,树干各方位边材J_s其午间峰值出现的时刻有差异,呈从早到晚分别是东侧、南侧、西侧、北侧这种顺时针的方位规律;(4)在整个生长季,J_s的日平均值大小一般为南侧>西侧>北侧>东侧,但方位间差异并不显著(P=0.35),北侧J_s的平均值最接近4个方位的平均值(约为平均值的1.01倍)。[结论]为降低观测成本,通过北侧一个方位的测定来估算赤松单株的液流通量具有较好的可靠性;影响赤松各方位液流过程明显变化的θ的阈值为7.5%。

基于运动特性的农机导航控制方法

农业机械(农机)运动学模型的精度影响导航控制精度和稳定性,为提高农机路径跟踪控制器精度,提出了一种基于运动特性的农机导航控制器设计方法。该方法主要是对传统二轮车运动学模型建模方法进行改进,针对传统二轮车模型小角度近似替代(方向角等于横摆角)的缺点,采用加入侧偏角的方法优化农机运动学建模过程。采用相同的控制方法(状态反馈控制)和不同的运动学模型设计控制器进行对照实验。直线路径跟踪时,侧偏角对模型精度影响较小,引入侧偏角可以在一定程度上影响农机的跟踪精度;曲线路径跟踪时,侧偏角对方向角的变化影响较大,可以大幅影响路径跟踪精度。以安装有自动导航设备的拖拉机为实验平台进行实地实验,结果表明:直线行驶的最大横向误差平均值为0.0454 m,绝对平均误差平均值为0.0149 m,标准差平均值为0.0119 m;曲线行驶的最大横向误差平均值为0.1613 m,绝对平均误差平均值为0.0688 m,标准差平均值为0.0434 m;基于本文提出的优化模型设计的路径跟踪控制器对直线路径跟踪有一定提升,对曲线跟踪精度有大幅提升。

小活络丸联合双氯芬酸钠及功能锻炼治疗肩周炎

目的观察小活络丸联合双氯芬酸钠及功能锻炼治疗肩周炎的临床疗效。方法将99例肩周炎患者依据就诊顺序分为对照组50例和观察组49例,对照组采用双氯芬酸钠缓释胶囊口服,配合双手爬墙、甩手运动和头枕双手运动功能锻炼,观察组在对照组治疗的基础上加用小活络丸口服。治疗前后采用简化McGill疼痛问卷(SF-MPQ)评估患者肩部疼痛情况,采用肩关节功能评价量表评估患者肩关节功能改善情况,并观察患者中医证候积分改善情况。结果观察组治疗总有效率(89.80%,44/49)高于对照组(74.00%,37/50)(P<0.05)。治疗后2组SF-MPQ评分和中医证候积分低于治疗前(P<0.05),观察组SF-MPQ评分和中医证候积分低于对照组(P<0.05);2组肩关节功能评分高于治疗前(P<0.05)。观察组肩关节功能评分高于对照组(P<0.05)。结论小活络丸联合西药及功能锻炼治疗肩周炎,能减轻肩部疼痛,改善肩关节功能。

产业集聚、税收竞争与企业税负

基于新经济地理学理论,探究了地区间的横向税收竞争与产业集聚之间的非线性关系。利用统计年鉴中1996—2015年我国省级宏观面板数据进行检验,并进一步分析了其空间结构性差异和时间结构性差异。实证结果显示:各省实际税率与产业集聚之间存在U型关系,税收竞争与产业集聚的关系存在显著的地区结构性差异,2008年新企业所得税实施前后,税收竞争与产业集聚的关系发生了结构性变化。

文化品牌价值评价模型研究

科学评价文化品牌价值是文化类企业有效降低融资难度,提升品牌竞争力,赢得发展空间的重要基础。目前在品牌价值评价相关研究方面,缺少以文化品牌为对象的研究成果。针对该问题,文章应用多周期超额收益法,以文化品牌的价值构成为切入点,构建了文化品牌价值的评价体系和模型,为科学衡量文化品牌价值提供参考依据,对促进文化类企业品牌建设与发展具有重要的意义。

高精密单轴伺服转台结构设计

文中从总体需求出发,设计了一台高精密单轴伺服转台。根据总体技术指标要求,确定转台与安装平台及负载的接口尺寸;通过计算转台承受的负载和实际工况,选择直流力矩电机直接套轴驱动的传动方式;依据光栅测角传感器特点,选择单光栅与2个读数头结合的方式来提高测角精度。采用有限元分析方法完成转台的静力学性能分析和动力学模态分析,得出在仿真条件下转台的应力分布和位移分布情况以及转台前6阶振型和固有频率。结果表明,该型转台满足系统的技术指标要求,设计合理可行。