不同精粗比饲粮对秋季羔羊生长性能、养分表观消化率、瘤胃发酵和血清免疫指标的影响

试验旨在研究不同精粗比饲粮对秋季羔羊生长性能、瘤胃发酵、养分表观消化率和血清免疫指标的影响。试验选取4月龄“杜泊×小尾寒羊”F1代杂交公羔30只,随机分为3组,每组10个重复,每个重复1只羊。试验Ⅰ组、Ⅱ组、Ⅲ组分别饲喂精粗比为40∶60、55∶45、70∶30的饲粮。结果显示:试验Ⅲ组羔羊的平均日增重显著高于试验Ⅰ组(P<0.05),试验Ⅱ组和Ⅲ组料重比显著低于试验Ⅰ组(P<0.05)。试验Ⅰ组干物质、有机质、粗蛋白和中性洗涤纤维的表观消化率均显著低于其他组(P<0.05),试验Ⅱ组有机物的表观消化率显著高于试验Ⅲ组(P<0.05)。试验Ⅰ组羔羊的瘤胃内丙酸含量显著低于其他组(P<0.05),试验Ⅰ组的乙丙比显著高于其他组(P<0.05)。试验Ⅱ组血清免疫球蛋白G含量显著高于试验Ⅲ组(P<0.05),试验Ⅱ组血清中白细胞介素-6含量显著低于其他组(P<0.05)。研究表明,饲粮精粗比为55∶45时可以使秋季羔羊发育更健康,提高了饲料利用率和生长性能,增加了经济效益。

便通凝胶贴膏的制备及药效学评价

目的优化便通凝胶贴膏的制备工艺并研究其对阳虚便秘模型大鼠的作用。方法采用单因素实验和L^(9)(3^(4))正交实验设计优化便通凝胶贴膏的制备工艺。将40只大鼠分为空白对照组、模型组、阳性对照组、贴膏组,除空白对照组外,其他各组动物采用“白醋+0℃冰水+复方地芬诺酯”灌胃的方法建立阳虚便秘模型;造模成功后,空白对照组和模型组大鼠灌胃等体积的生理盐水,阳性对照组大鼠给予市售的便通胶囊,每次灌胃1.2 g/200 g,每日两次;贴膏组贴敷制备的便通凝胶贴膏,每次贴12 h,贴于大鼠腹部;观察大鼠的一般生物学特征、粪便含水量及血清中胃泌素(Gas)、血管活性肠肽(VIP)、内皮素(ET)、胃动素(MTL)的含量。结果正交实验的最佳制备工艺为PVPK901.5 g、高岭土1.0 g、聚丙烯酸钠1.5 g、羧甲基纤维素钠0.5 g,经验证优化后的制备工艺稳定。与空白对照组比较,模型组大鼠的一般生物学特征、粪便含水量及血清中Gas、VIP、ET、MTL的水平均有显著差异,说明造模成功;给药后,阳性对照组与贴膏组各项指标均显著改善。结论优化的便通凝胶贴膏制备工艺可行,对阳虚便秘大鼠具有良好的治疗效果。

HPLC法测定便通凝胶贴膏中松果菊苷含量

目的:建立便通凝胶贴膏中松果菊苷的测定方法,以便控制便通凝胶贴膏的质量。方法:根据《中国药典》一部中肉苁蓉高效液相色谱法测定;以甲醇为流动相A、1%的醋酸溶液为流动相B、进行梯度洗脱,以DikmaDiamonsil(钻石C185μm,250×4.6mm)为色谱柱,流速为1mL·min^(-1),柱温30℃,进样量20μL,检测波长为332nm。结果:松果菊苷浓度在0.6μg·mL^(-1)~45.0μg·mL^(-1)的范围内线性关系良好,回归方程为:y=11594x-516.3,R^(2)=0.9990;回收率为100.96~98.96,RSD=1.0%。结论:本方法符合测定要求,可用于便通凝胶贴膏中松果菊苷的含量测定。

改性火山石对水中氨氮的去除效果分析

湖泊富营养化已成为普遍关注的环境卫生问题之一,其中内源性氨氮污染是治理富营养化问题的关键。颗粒型天然火山石常用于内源性氮、氨废水的吸附处理,但去除效果不理想。因此,选择利于脱水分离处理的火山石作为基础材料,先后使用HCl和NaOH两种溶液以化学改性的方式处理火山石,以提高其吸附性能,从而有效去除水体中的氨氮。从表征和实验测试两方面测试改性后火山石的氨氮吸附效果。表征观测结果显示:改性后的火山石表面形成更多的吸附位点和更加复杂的孔隙结构,使得火山石的比表面积增加,活性位点数量增加,从而提高了火山石对溶液中氨氮的吸附能力;从改性火山石吸附能力、吸附等温线、溶液初始pH值和投加量对吸附性能的影响4个方面进行实验测试。实验测试结果表明:拟合后改性火山石吸附剂吸附水体中氨氮污染物的过程属于准二级吸附;且改性火山石最大吸附容量是天然火山石最大吸附容量的2.29倍,即这种改性火山石吸附氨氮污染物吸附能力较好,可以有效去除水中的氨氮污染。

基于石油化工虚拟仿真资源开发的职业本科创新创业教学改革实践

伴随着第一批职业本科学生毕业,未来职业本科教育将成为职业教育的重要内容。职业教育创新创业教学改革,是职业本科教育发展与提升的重要手段。从职业本科创新创业教学的发展以及石油化工虚拟仿真资源的基础理论出发,结合高校创新创业教学中存在的实际问题,从教与学的目的、教学的合理规划、虚拟仿真资源开发、拓展教学实践与交流资源、创新创业支持等方面阐述了职业本科创新创业教学的改革实践。

舵机测试力矩不合格故障研究

在舵机进行高低温试验过程中,由于控制电路板上某一配对电阻包封层进入了水气,水气浸入电阻内部的电阻膜表面,在舵机产品检测时,造成电阻膜被电解腐蚀,改变了电阻阻值。当控制电路连接直流电机负载时,直流电机某个偏转方向工作电流小,在舵机输出力矩测试时,表现为力矩值不合格。

基于大数据的水生态承载力分析模型

随着科学技术的发展,水文信息数据量发生了巨大的增长,如何充分利用这些支持决策的大规模数据,是当前科学家面临一个大问题.传统的水生态承载力分析计算复杂多样,涉及的数据种类多样,扩展性不强,注重于理论研究和分析,本文通过研究历史数据,分析影响水生态承载力的因素,将数据划分为3个指标层,提出一种基于大数据的水生态承载力分析模型(ECCBD).利用Hadoop集群的HDFS分布式文件系统实现水生态数据的备份存储,利用MapReduce实现海量水生态数据的并行计算.通过输出值与水生态承载力对比,判断水资源是否盈余或赤字,本文提出的方法和模型能够从压力、承载力、弹性力3个不同的指标层有效分析水生态环境现况,对提供水生态保护依据上有重要意义.

高校“困难学生”精准帮扶工作质量提升探析

高校“困难学生”帮扶工作是落实立德树人根本任务的重要内容,是加快构建高校思想政治工作体系的应有之义。高校要以学生为中心构建学情熟知、精准帮扶、风险防控和学院特色工作四位一体的“困难学生”精准帮扶质量提升考核指标体系,有效发挥其协同性、精准性和导向性,强化高校教育管理服务精准发力的逻辑思维,不断提升思想政治工作针对性和实效性。

过程教育哲学视角下的青年学生伟大民族精神教育与弘扬

习近平总书记对中华民族伟大民族精神的丰富内涵进行了深刻阐述,为新时代青年学生培育和践行社会主义核心价值观提供了基本遵循和行动指南.怀特海在过程哲学基础上,探讨教育理念和实践价值而形成的过程教育哲学理念,对于探索教育引导青年学生弘扬中华伟大民族精神的路径具有重要启示.

尿路念珠菌感染流行病学特征及氟康唑治疗疗效的分析

目的探讨尿路念珠菌感染的病原菌流行病学特征及分析氟康唑治疗尿路念珠菌感染的疗效。方法采用单中心、回顾性研究方法,收集62例氟康唑治疗尿路念珠菌感染患者的临床资料。结果本研究中,白念珠菌、光滑念珠菌和热带念珠菌感染所占比例分别为32.3%、30.6%和30.6%。其他感染病原菌包括2株近平滑念珠菌和2株链状假丝酵母菌。念珠菌对氟康唑的最低抑菌浓度(MIC)在1~128μg/mL范围内均有分布,对氟康唑的耐药率为17.7%(11/62)。氟康唑治疗尿路念珠菌感染总体有效率为54.8%(34/62),200与400mg/d两种给药方案的治疗有效率分别为53.1%和56.7%。Logistics回归模型表明氟康唑治疗尿路念珠菌感染与日剂量和MIC比值(Dose/MIC)具有显著相关性(P=0.006,OR=1.006)。当Dose/MIC>200时,临床有效率可达73.3%。结论尿路念珠菌对氟康唑的耐药率高,非白念珠在尿路感染中比例增加,氟康唑治疗尿路念珠菌感染的疗效与Dose/MIC值具有显著相关性。临床实践中应结合药敏结果制定尿路念珠菌感染的抗真菌给药方案。

Study on Wave Dissipation of the Structure Combined by Baffle and Submerged Breakwater

This paper proposes a structure combined by baffle and submerged breakwater （abbreviated to SCBSB in the following texts）. Such a combined structure is conducive to the water exchange in the harbor, and has strong capability on wave dissipation. Our paper focuses on the discussion of two typical structures, i.e., the submerged baffle and rectangular breakwater combined with the upper baffle respectively, which are named as SCBSB 1 and SCBSB2 for short. The eigenfunction method corrected by experimental results is used to investigate the wave dissipation characteristics. It shows that the calculated results agree well with the experimental data and the minimum value of the wave transmission coefficient can be obtained when the distance between the front and rear structures is from 1/4 to 1/2 of the incident wave length.

SPH Numerical Modeling for the Wave–Thin Structure Interaction

In this paper, a numerical model of 2D weakly compressible smoothed particle hydrodynamics(WCSPH) is developed to simulate the interaction between waves and thin structures. A new color domain particle(CDP)technique is proposed to overcome difficulties of applying the ghost particle method to thin structures in dealing with solid boundaries. The new technique can deal with zero-thickness structures. To apply this enforcing technique, the computational fluid domain is divided into sub domains, i.e., boundary domains and internal domains. A color value is assigned to each particle, and contains the information of the domains in which the particle belongs to and the particles can interact with. A particle, nearby a thin boundary, is prevented from interacting with particles, which should not interact with on the other side of the structure. It is possible to model thin structures, or the structures with the thickness negligible with this technique. The proposed WCSPH module is validated for a still water tank, divided by a thin plate at the middle section, with different water levels in the subdomains, and is applied to simulate the interaction between regular waves and a perforated vertical plate. Finally, the computation is carried out for waves and submerged twin-horizontal plate interaction. It is shown that the numerical results agree well with experimental data in terms of the pressure distribution, pressure time series and wave transmission.

Effect of the Coefficient on the Performance of A Two-Layer Boussinesq- Type Model

The coefficients embodied in a Boussinesq-type model are very important since they are determined to optimize the linear and nonlinear properties.In most conventional Boussinesq-type models,these coefficients are assigned the specific values.As for the multi-layer Boussinesq-type models with the inclusion of the vertical velocity,however,the effect of the different values of these coefficients on linear and nonlinear performances has never been investigated yet.The present study focuses on a two-layer Boussinesq-type model with the highest spatial derivatives being 2 and theoretically and numerically examines the effect of the coefficient on model performance.Theoretical analysis show that different values for(0.13≤α≤0.25)do not have great effects on the high accuracy of the linear shoaling,linear phase celerity and even third-order nonlinearity for water depth range of 0<kh≤10(k is wave number and h is water depth).The corresponding errors using different values are restricted within 0.1%,0.1%and 1%for the linear shoaling amplitude,dispersion and nonlinear harmonics,respectively.Numerical tests including regular wave shoaling over mildly varying slope from deep to shallow water,regular wave propagation over submerged bar,bichromatic wave group and focusing wave propagation over deep water are conducted.The comparison between numerical results using different values of,experimental data and analytical solutions confirm the theoretical analysis.The flexibility and consistency of the two-layer Boussinesq-type model is therefore demonstrated theoretically and numerically.

Experimental Study on Wave Attenuation Performance of A New Type of Floating Breakwater with Twin Pontoons and Multi Porous Vertical Plates

A floating breakwater(FB)has extensive potential applications in the fields of coastal,offshore,and ocean engineering owing to its advantages such as eco-friendliness,low cost,easy and rapid construction,and quick dismantling and reinstallation.An FB composed of twin pontoons and multi-porous vertical plates is proposed to improve the wave attenuation performance.The wave attenuation performance is investigated for different FB structures and vertical plate types under different incident wave heights and periods using 2D wave physical model tests in a wave flume.The results demonstrate that the proposed FB has a better performance than that of the conventional single pontoon-type FB.It reduces the wave transmission due to its enhanced wave reflection and energy loss.The wave transmission coefficient of the proposed FB decreases with an increase in the number of layers and relative draft depth of the vertical plates.However,a further decrease in the wave transmission coefficient is not observed when the number of porous vertical plates is increased from 4 to 5 layers.An equation has been derived to predict the wave transmission of the proposed FB based on the experimental results.

Inverse Calculation of Wave-Absorbing Structure Dimensions Based on Extended ANFIS Model

A new wave energy dissipation structure is proposed, aiming to optimize the dimensions of the structure and make the reflection of the structure maintain a low level within the scope of the known frequency band. An optimal extended ANFIS model combined with the wave reflection coefficient analysis for the estimation of the structure dimensions is established. In the premise of lower wave reflection coefficient, the specific sizes of the structure are obtained inversely, and the contribution of each related parameter on the structural reflection performance is analyzed. The main influencing factors are determined. It is found that the optimal dimensions of the proposed structure exist, which make the wave absorbing performance of the structure reach a perfect status under a wide wave frequency band.

A Hybrid Finite-Volume and Finite Difference Scheme for Depth- Integrated Non-Hydrostatic Model

A depth-integrated, non-hydrostatic model with hybrid finite difference and finite volume numerical algorithm is proposed in this paper. By utilizing a fraction step method, the governing equations are decomposed into hydrostatic and non-hydrostatic parts. The first part is solved by using the finite volume conservative discretization method, whilst the latter is considered by solving discretized Poisson-type equations with the finite difference method. The second-order accuracy, both in time and space, of the finite volume scheme is achieved by using an explicit predictor-correction step and linear construction of variable state in cells. The fluxes across the cell faces are computed in a Godunov-based manner by using MUSTA scheme. Slope and flux limiting technique is used to equip the algorithm with total variation dimensioning property for shock capturing purpose. Wave breaking is treated as a shock by switching off the non-hydrostatic pressure in the steep wave front locally. The model deals with moving wet/dry front in a simple way. Numerical experiments are conducted to verify the proposed model.

多孔氢键有机框架材料的研究进展

多孔氢键有机框架作为一种新型多孔晶态材料,凭借自身性能的稳定性,广泛应用于质子传导、药物分析传递、分子器件等领域。为更好地发挥多孔氢键有机框架的经济价值与使用属性,满足不同场景下新型材料的使用需求,系统探讨多孔氢键有机框架材料的研究进展,通过技术发展的综合性论述,以确保材料研发、应用等活动的有序开展。

Conditions and Phase Shift of Fluid Resonance in Narrow Gaps of Bottom Mounted Caissons

This paper studies the viscid and inviscid fluid resonance in gaps of bottom mounted caissons onthe basis of the plane wave hypothesis and full wave model, The theoretical analysis and the numerical results demonstrate that the condition for the appearance of fluid resonance in narrow gaps is kh=（2n＋1）π （n=0, 1, 2, 3 ）, rather than kh=nn （n=0, 1, 2, 3, ...）; the transmission peaks in viscid fluid are related to the resonance peaks in the gaps. k and h stand for the wave number and the gap length. The combination of the plane wave hypothesis or the full wave model with the local viscosity model can accurately determine the heights and the locations of the resonance peaks. The upper bound for the appearance of fluid resonance in gaps is 2b/L〈l （2b, grating constant; L, wave length） and the lower bound is h/b〈~ l. The main reason for the phase shift of the resonance peaks is the inductive factors. The number of resonance peaks in the spectrum curve is dependent on the ratio of the gap length to the grating constant. The heights and the positions of the resonance peaks predicted by the present models agree well with the experimental data.

A Comprehensive Lagrangian Transport Study in A Long-Narrow Bay,Xiangshan Bay,China

Study on the transport and mixing in coastal waters is of great concern to the ocean resources exploitation and ecological system protection.Lagrangian methods are direct and effective of researching mass transport.Two Lagrangian tools were adopted and combined to describe water transport in a long-narrow bay,Xiangshan Bay,China.Based on the fields of tidal velocity simulated from the 3-D hydrodynamic model,Lagrangian Coherent Structures(LCSs)and synoptic Lagrangian maps(SLMs)were calculated in the study area.Through comparison of the results,the features and relation of the two tools were discussed.The results show that the LCSs act as the separatrix of the water regions with different transport characteristics and can identify the water areas with different transport time scales.The comprehensive application of the Lagrangian tools is helpful to obtain more insight into the water transport process.

基于薄膜太阳能发电玻璃行业的MES系统研究

通过对不同行业MES的应用对比,研究薄膜太阳能发电玻璃行业MES的不同之处,并结合实际项目中MES系统使用过程中发现的问题进行研究总结。研究结果表明,在设计MES需求时,必须通过MES对现场操作进行严格的流程管控,尽量减少人工干预,才能获取更好的数据质量,更好的为数据分析和工艺改善服务,且必须有专业的MES工程师进行前期技术对接和维护,才能使MES在薄膜太阳能行业的设计及应用更加成熟。