Finite element modeling and multi-software co-simulation in automobile EMC prediction

For general software in the limitation of large and complex structures’ modeling, this article proposes a multi-software co-simulation technology. Hypermesh is a pre-processing software which can high-quality import and triangular CAD-models, taking advantage of this, the CAD-model of the car is meshed in Hypermesh. Using Matlab,the node coordinates data of each component’s elements are extracted from the grid data file outputted by Hypermesh, and are exported in the form of text file for Hfss to read.VBS program is used to build the finite element model, which is written in Matlab, then runs in Hfss to read the node coordinates data and form the initial triangular-mesh model of the Automobile. Considering only the interference of the ignition system power line’s common-mode current we simulated and analyzed the electric field distribution inside and outside of the automobile.This modeling method has a strong commonality ,and is a good reference for automobile EMC simulation modeling.     

Growth,leaf photosynthesis and canopy light use efficiency under differing irradiance and soil N supplies in the forage grass Brachiaria decumbens Stapf

Irradiance and soil nitrogen effects on growth, net photosynthesis and radiation use efficiency (RUE) of Brachiaria decumbens were investigated in fertilized and non‐fertilized stands. Three levels of photosynthetic photon flux (PPF: S0 = 100%, S1 = 50% and S2 = 30%) and two N supplies, with (N+) and without (N?), were used. Forage biomass and nutrient accumulation, specific leaf area (SLA), leaf area index (LAI), fractional intercepted photosynthetic photon flux (fPPF), leaf photosynthetic response to light and efficiency of radiation use at leaf (A/Q) and canopy (RUE) levels were measured. Shade effects were mostly independent of soil N. Final yield was decreased by 34% (S1) and 57% (S2). Shade increased SLA (25–46%), so maximum LAI (2·4–3·3) was similar among light regimes. In N? stands, reductions in leaf biomass (14%), SLA (17%) and LAI (27%) were recorded, although forage yield was similar between soil N conditions. Under shade, peaks of A were comparable to those at full light, so A/Q was higher around midday. Derived parameters of the A‐PPF curves were similar between S0 and S2. A maximum fPPF = 0·8 (S0N+, S1N+) was recorded at LAI = 3–4. Under limited sunlight, relatively high RUE (1·6–2·8 g MJ^?1) were observed over both soil N conditions. We concluded that B. decumbens had a high plasticity to shade, thus explaining its success under silvopastoral systems.     

园艺疗法发展历程及研究动态

通过分析国内外关于园艺疗法的研究文献,对园艺疗法的概念和类型,园艺疗法的发展和研究进展,以及其功能几个方面进行归纳和总结。指出了中国目前园艺疗法的研究与发展中的优势与不足。希望以此作为日后研究园艺疗法的基础,能够为园艺疗法应用场所的建设起到推动作用。     

稻壳灰制备硅铁红的工艺研究

[目的]研究了稻壳灰制备硅铁红的工艺,为拓宽稻壳灰综合利用途径提供参考。[方法]在微波辐射条件下,采用稻壳灰为原料制备水玻璃,而后以此水玻璃为原料,利用溶胶-凝胶法,在微波辅助干燥条件下制备硅铁红颜料。同时考查了硅/铁摩尔比、微波辐射功率及时间、煅烧温度等因素对硅铁红包裹率的影响。[结果]研究表明,硅/铁摩尔比为7∶1,微波辐射功率和时间分别为600 W和8min,前驱体煅烧温度和时间分别为750℃和2 h;此条件下制备的Fe2O3/SiO2,其包裹率达到93.1%。[结论]在微波辅助下通过简单的sol-gel工艺,可以将SiO2玻璃包裹于Fe2O3颗粒表面而制备出硅铁红包裹颜料并且所制备的硅铁红包裹率高达93%左右,比市售硅铁红的包裹率要高。该工艺操作简单,适合工业化生产。     

Evaluation of Equine Albumin Solution in Fluid Therapy in Horses with Colic

Equine albumin solution can be a good therapeutic option in fluid replacement for treatment of horses with colic. The purpose of this study was to evaluate the effects of initial fluid therapy with equine albumin solution in horses presenting with colic and mild-to-moderate dehydration, and to compare this therapy with fluid therapy based on crystalloids alone. Nineteen horses of both genders presenting with colic and mild-to-moderate dehydration were used. Animals were randomly assigned to one of two groups (control: fluid therapy based on crystalloid solutions; experimental: fluid therapy based on equine albumin and crystalloid solutions). Physical examination, hematocrit determination, blood gas analysis, serum biochemistry, blood and peritoneal lactate assessment, and measurement of colloid osmotic and arterial pressure were performed at predetermined times. Good results were obtained with equine albumin solution. More fluid is attracted into and maintained in the intravascular compartment, despite infusion of small volumes, as indicated by higher arterial pressure, lower capillary refill time, lower hematocrit and serum protein concentrations, lower colloid osmotic pressure, and better skin turgor. Equine albumin solution has good oncotic action and is a safe fluid therapy option for horses with colic and mild-to-moderate dehydration. Our results suggest it can be a good choice of fluid for correction of severe dehydration, although further research is necessary to determine the adequate dose in such cases.     

淫羊藿苷对辐射损伤小鼠保护作用研究

目的：探讨淫羊藿苷（ICA）对辐射损伤小鼠的保护作用。方法：将50只昆明小鼠按体重随机分为5组,3个剂量组分别按20、80、160 mg/kg体质量给小鼠灌服淫羊藿苷水溶液,正常对照组和照射对照组给予同体积生理盐水,1次/d,连续灌胃16 d。第6天照射对照组和3个剂量组小鼠用5.0 Gy60Co-γ射线进行单次全身照射。照射后第10天检测小鼠的血液学指标、脏器系数及MDA含量、SOD和GSH-Px活性。结果：与照射对照组比较,高剂量组的白细胞和GSH-Px活性显著增加（P〈0.05）,3个剂量组的血小板显著升高（P〈0.05）,SOD含量显著降低（P〈0.05）。结论：淫羊藿苷对小鼠辐射造成的损伤具有保护作用。     

灌浆期弱光逆境对小麦生长和产量影响的模拟模型

【目的】定量研究灌浆期弱光逆境对弱筋小麦生长和产量的影响,为应对全球气候变化造成的弱光天气事件对小麦生产的不利影响提供决策依据。【方法】以弱筋小麦品种扬麦15号、扬麦13号和宁麦9号为试材,通过设定灌浆期4个光照强度（光照强度分别为自然光强的100%、50%、34%和16%）和4个弱光持续时间（2 d、4 d、6 d和8 d）的遮阴处理试验,模拟连阴雨天气导致的弱光逆境对小麦生长和产量的影响。在定量分析试验数据的基础上,确定弱光逆境对小麦叶片光合作用、叶面积指数和经济系数的影响因子的计算方法。将上述影响因子计算公式与SUCROS模型结合,建立灌浆期弱光逆境影响小麦生长和产量的模拟模型,并使用独立试验资料对模型进行检验。【结果】小麦灌浆期日总光合有效辐射低于3.71 MJ•m-2且持续2 d以上对叶片净光合速率产生显著影响;日总光合有效辐射低于3.71 MJ•m-2且持续4 d以上对叶面积指数、干物质生产和产量产生显著影响。用独立试验资料对模型检验的结果表明,模型对叶片净光合速率、叶面积指数、总干重和产量的模拟值与实测值基于1﹕1线的决定系数（R2）分别为0.78、0.88、0.96、0.96,相对均方根差（rRMSE）分别为5.69%、12.46%、3.32%、5.24%。【结论】本研究建立的模型可以较好地模拟不同强度和持续时间的弱光逆境对小麦灌浆期生长和产量的影响,从而为评估全球气候变化背景下弱光天气事件对小麦生产的不利影响提供了模型工具。     

磷脂酰肌醇3-磷酸对UV-B诱导蚕豆保卫细胞中过氧化氢产生和气孔关闭的影响

【目的】研究磷脂酰肌醇3-激酶（PI3K）催化产物磷脂酰肌醇3-磷酸（PI3P）对紫外线B（UV-B）诱导保卫细胞中过氧化氢（H2O2）产生和气孔关闭的影响,为进一步阐明植物细胞转导UV-B辐射信号的机制提供依据。【方法】以蚕豆（Vicia faba L.）表皮条为材料,采用PI3K的抑制剂沃曼青霉素（WM）和LY294002（LY）来抑制PI3P的形成,采用二苯基碘（DPI）和水杨基氧肟酸（SHAM）分别抑制H2O2形成的NADPH氧化酶途径和细胞壁过氧化物酶途径,通过气孔开度分析和激光扫描共聚焦显微镜技术,确定PI3P在0.8 W•m-2 UV-B辐射诱导蚕豆保卫细胞H2O2产生和气孔关闭中的作用。【结果】WM和LY能显著抑制UV-B诱导的保卫细胞H2O2产生和气孔关闭;外源H2O2处理能显著逆转WM和LY对UV-B诱导气孔关闭的抑制效应,但WM和LY不能抑制外源H2O2诱导的气孔关闭;UV-B诱导的保卫细胞H2O2产生和气孔关闭能被活性氧清除剂和SHAM显著抑制,但不能被DPI抑制。【结论】PI3P通过诱导蚕豆保卫细胞中产生于过氧化物酶途径的H2O2形成来介导UV-B辐射诱导的气孔关闭。