农药克南试验过程中的温度补偿研究

爆炸性是农药安全性的重要指标,其检测是通过克南试验完成的。在介绍克南试验工作原理的基础上,介绍了一种自动制样装置,并对检测过程中的温度误差进行了研究,结合最小二乘法和拉格朗日插值法实现了温度补偿。对多种农药的试验结果表明,该方法能够克服温度漂移问题,对农药的危险性检测具有实用价值。     

优化梗丝生产过程参数降低烟叶消耗

为了提高干燥后梗丝的综合质量和利用率,通过加工过程参数的优化,在卷制过程中减小烟支的目标重量,降低烟叶消耗。试验结果表明,通过加工过程参数的优化生产出来的梗丝,经掺配后（掺配比例38%）短支烟在相同目标重量的情况下,提高吸阻（在控制吸阻的情况下,减小目标重量）,从而降低烟叶消耗。     

关于植物吸水动力的新见解

叶肉细胞产生的渗透吸力和根细胞产生的渗透压力是水分吸收运输的主要动力。根压是吸水结果而不是吸水动力。蒸腾只是一个失水过程而不能直接产生吸水动力,所谓蒸腾拉力是叶肉细胞通过渗透吸水在导管内产生的负压。水分的吸收运输完全是建立在渗透平衡基础上进行的。     

人造板生产用导热油管道及支架设计

在综合分析人造板生产用导热油特点的基础上,计算3种不同压力导热油支架的水平应力和尺寸。简述导热油压力计算方法,提出降低压力的有效措施,为人造板行业导热油参数选择提供参考。     

Stenosis hemodynamics: from physical principles to clinical indices

Clinical evaluation of patients with aortic stenosis entails hemodynamic determinations and interpretations that depend on complex blood flow patterns. Although pressure gradient and Doppler velocity are intrinsically adjusted for a wide range of species and body size, they are highly flow-dependent indices that can vary among patients with physically identical stenosis areas and within individuals between determinations. Other indices, such as the Gorlin area, are adjusted for flow. All stenosis indices derived from hemodynamic measurements, however, must exhibit some degree of flow dependence because of fundamental aspects of fluid dynamics that affect the blood velocity profile. The Gorlin effective orifice area is an index that sacrifices adjustment for body size. This hinders comparisons over a range of patient species, breed, and size because it may be problematic to determine what effective orifice area is appropriate for a given individual. One potential solution is to compare the effective area of an individual's normal tract, if one exists, to the tract in question as a ratio, the effective orifice area ratio (EOAR). The EOAR can be estimated from the ratio of flow velocity integrals (FVIs) of the 2 outflow tracts. Clinical data and experience are lacking, but theoretical advantages of the index include intrinsic adjustment for both body size and flow rate. Aortic stenosis is a complex, multifactorial disease, and selection of an optimal hemodynamic severity index may not result in adequate prognostic criteria for segregation of patient risk and treatment groups.     

压强、固化时间与赋形剂对舔块饲料质量参数和舔食量的影响

通过 3个试验研究了 3种压强、固化时间及赋形剂的添加水平对尿素 糖蜜 矿物质舔块质量参数和舔食量的影响。结果表明 ,随着压强的增加 ,舔块硬度和密度呈二次曲线规律提高 (P <0 .0 0 1) ,而厚度膨胀度和肉牛舔食量呈二次曲线规律降低 (P <0 .0 0 1) ,其曲线的拐点约在 2 0Mpa压强。固化时间对舔块硬度、密度和膨胀度均有显著影响 (P <0 .0 5 )。糖蜜、氧化钙添加水平 ,导致舔块硬度和密度明显增加 (P <0 .0 5 )。本试验结论 :糖蜜、氧化钙、氧化镁和钠型的适宜添加水平为 12 %、5 %、2 %～ 4 %和 5 %～ 10 %。     

萜烯树指及其在压敏胶粘剂中的应用

本文对萜烯树脂生产和研究的基本情况及在压敏胶中的应用作了综述性报道     

Effects of irbesartan and perindopril on pressure overload-induced cardiac hypertrophy in rats

AIM: To observe the effects of irbesartan and perindopril on pressure-overload cardiac hypertrophy in rats. METHODS: 40 male adult Sprague Dawley rats were divided into 5 groups. One was sham operation group, other four were aortic banding groups. One week after operation, all rats were gavaged with normal saline, perindopril, irbesartan or combination of perindopril and irbesartan. Morphometric determination, calcineurin (CaN) expression, CaN and sarcoplasmic reticulum (SR) Ca²⁺-ATPase activity were performed at the end of 6 weeks of drug intervention. RESULTS: Left ventricular mass index (LVMI), transverse diameter of myocardical cell (TDM), CaN activity were remarkably decreased after drug intervention and this decrease was most remarkable in the combination group. SR Ca²⁺-ATPase activity increased after drug intervention, especially in the combination group. CaN expression in myocardium were remarkably decreased after drug intervention. LVMI was positively correlated with TDM and CaN, negatively correlated with SR Ca²⁺-ATPase. CONCLUSION: Both irbesartan and perindopril decrease CaN activity, increase SR Ca²⁺-ATPase activity and combination of them has synergic effects on regressing of ventricular hypertrophy.     

Carprofen and buprenorphine prevent hyperalgesia in a model of inflammatory pain in cats

A model of nociceptive threshold determination was developed for evaluation of NSAID analgesia in cats. In a crossover study, eight cats received carprofen (4 mg/kg), buprenorphine (0.01 mg/kg) or saline (0.3 ml) subcutaneously before intradermal kaolin injection on the antebrachium to induce mild inflammation. Pressure thresholds were measured at the injected site using blunt-ended pins advanced by manual inflation of a bladder within a bracelet. Bladder pressure was recorded as threshold (PT) at the behavioural end point. Baseline PT were recorded before kaolin injection (time 0). PT was measured at 2-10 h intervals for 52 h. PT below the lower 95% confidence interval (CI) of baseline values indicated hyperalgesia. After saline, hyperalgesia was detected from 2-6 h, 22-26 h, and at 30 and 36 h. After carprofen, PT remained within the 95% CI. After buprenorphine, PT remained within the 95% CI except at 2h. Carprofen and to some extent buprenorphine, prevented inflammatory hyperalgesia.     

The influence of the width of the saddle tree on the forces and the pressure distribution under the saddle

As there is no statistical evidence that saddle fit influences the load exerted on a horse's back, this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as "too-narrow" if they were one size (2 cm) narrower than the LOF saddle, and "too-wide" if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as "very-wide". In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm(2)+/-0.10; trot 1.08 N/cm(2)+/-0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm(2)+/-0.09; trot 0.86 N/cm(2)+/-0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm(2)+/-0.06; trot 1.52 N/cm(2)+/-0.19) and very-wide saddles (walk 0.77 N/cm(2)+/-0.06; trot 1.57 N/cm(2)+/-0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm(2)+/-0.10/ 0.63 N/cm(2)+/-0.11; trot 1.33 N/cm(2)+/-0.22/1.27 N/cm(2)+/-0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks.