新建平房仓磷化氢环流熏蒸杀虫试验

文章主要论述磷化氢环流熏蒸中，仓房气密性与熏蒸浓度的关系、“动态潮解”产气法的简便性和经济性，并提出了在目前仓房条件下应采用的熏蒸浓度与密闭时间。     

Value Innovation Method in Product Scheme Cost Design

Product design now has a significant influence on the profitability of a business. Enterprise simulation can not only overcome the limitations of current product scheme cost evaluation methods , but also support Product Scheme Cost design of Dynamic Enterprise. Product Scheme Cost Design basing on Value Innovation Method aim at value increase , and use Enterprise simulation as Product design tools. To evaluate different design options, a series of runs are performed in Enterprise simulation system for each design variant. In this way , Product design face on enterprise business. This paper focus on value chain,and use it in Product design, provide a new way for Product design of Dynamic Enterprise.     

A four-compartment computer virus propagation model with graded infection rate

A new resident virus propagation model with graded infection rate is established based on the properties of two important stages undergoing by resident virus, which are the latent phase, in which resident virus cannot infect other hosts because it has not yet been loaded into memory and the active phase, in which resident virus resides in memory and infects any suitable program that is executed on the computer. Two computer compartments with different infection rate are established. Furthermore, the dynamic behaviors of this model are investigated by stability theory and numerical simulations. It is found that the dynamical properties of this model are determined by basic reproductive rate. Specifically, virus-free equilibrium is globally asymptotically stable if basic reproductive rate is less than or equal to one , whereas the local asymptotical stability of the viral equilibrium is guaranteed if basic reproductive rate is bigger than one, followed by a conjecture on its global stability. Then the sensitivity analysis of basic reproductive rate to the system parameters is investigated and a collection of policies is advised to control the spread of computer virus over the Internet.     

Applying hybrid dynamic substructure synthetic method to dynamic analysis for tower crane

This paper presents a dynamic hybrid substructure synthetic method for tower crane dynamic analysis. This method employs the transfer matrix method and the flexibility degree method respectively to formulate the vibration mathematical models of the tower body and tower top system substructures in the hoisting luffing plane. Based on the motion of the substructures in the interface and the dynamic harmonize condition, the frequency equations are established. Then the program is designed according to the mathematical models and firstly applied to the dynamic analysis of the QTZ63 tower crane in the construction site and the parameter identification of attached device and tower body. The test results show that the value calculated by the above method is quite approximate to the instrument measured value, which can meet the engineering requirements. Further study has found that , for the flexible long-distance attached tower crane, the method that introduces dynamic load coefficient for statics analysis of tower cranes is unprecise enough since there exist errors.This paper suggests to conduct site test and identification of the rigidity coefficient of attached device of the tower crane for the accident prevention of tower crane collapse by timely take measures.     

上海农业旅游发展的动力机制研究

从农业旅游的概念出发,提出上海农业旅游经历了探索成长期和成熟扩展期2个发展阶段,形成了5种经营类型。认为农业旅游的动力机制是由需求系统、引力系统、中介系统和农村支持系统构成。进而指出,在上海农业旅游的发展过程中,改革动力、市场动力、形象动力和社会动力先后在动力机制中发挥主导作用,并形成动态的变化形式。最后提出,由这4个力引发的内生的农村自我发展能力和外生的城市化外援驱动力维系了农业旅游动力机制的运行。     

3-D Dynamic Response of Reinforced Embankment and Track System Subjected to Moving Traffic Load

An analytic method was used to study the dynamic response of track system on reinforced embankment subjected to moving traffic load. Based on Biot's dynamic poro-elastic theory, dynamic analytical model of track system and reinforced embankment was established. The rails were described as an infinitely long Euler beam subjected to moving axle loads and sleepers were represented by continuous mass. Reinforced embankment embedded between track system and poro-elastic subsoil was modeled as a transversely isotropic layer. Subsoil was fully saturated poroelastic medium governed by the Biot's theory. Using the Fourier transform, the governing equations were then solved analytically in the frequency-wave-number domain. The time domain responses were obtained by the inverse Fourier transform computation. The influences of the train velocity, thickness of reinforced layer, load amplitude and reinforcement's ratio on the displacement responses of rails were carefully investigated. Computed results show that the vertical displacement of rails increases with the increase of load speed initially and decreases later. The displacement of rails with reinforced embankment is less than the ones without reinforced embankment. The displacement of rails increases with the increase of load amplitude and decreases with the increase of reinforcement's ratio.     

Dynamic characteristics and static response analysis of interval parameters structure

Determining the interval parameters of structural dynamic characteristics and the extreme value of static response can solve some structural uncertainties. The dynamic characteristics and static response of structures are always closely linked with the parameters. Finding the intrinsic link between them can make the calculation of the dynamic characteristics and the extreme value of interval structure simple and effective. Through function derivation of elastic modulus E and mass density ρ, it can be found that they are related to structural dynamic characteristics and static response. And the dynamic characteristics of trusses are taken as an example to calculate the maximum displacements of loading direction and unloading direction, their parameters are compared and the relation between elastic modulus and the displacement of loading direction are verified.     

Durum wheat varieties in N‐deficient environments and organic farming: a comparison of yield,quality and stability performances

Stability and reliability of yield and quality for 15 durum wheat genotypes (old and modern) were evaluated in a 5‐year experiment (southern Italy) in organic farming. Genotypes were grown at two N levels (0 and 80 kg/ha), with the aim of evaluating ‘genotype × environment’ (GE) interactions and their role on genotype selection in N‐limited environments. Several approaches to stability were used, within the frame of mixed models and additive main effects and multiplicative interaction analysis, and their validity in stressful conditions and organic farming was discussed. Especially for protein and gluten content, results indicate high environmental variability and the presence of crossover ‘N × environment’ interactions, which supports the need for specific breeding programmes in N‐deficient environments. The average response was strongly affected by N availability (on average, yield was 2.95 and 3.42 t/ha, protein content was 11.6% and 12.85%, gluten content was 8.55% and 9.92%, respectively, at 0 and 80 kg N/ha), and few genotypes gave high yield and quality at both fertilization levels. Only ‘Gargano’ and ‘Fortore’ showed a good inter‐year stability at both N levels. The old cultivars gave minimal responsiveness to increased N input, but gave good results in limiting conditions, indicating that they may play a role in organic farming.     

Calibration of Nonlinear Dynamical Analysis for RC Frame-wall Structure with Slender Coupling Beams Considering Stiffness Reduction

Two 16-storey frame-wall structures with slender coupling beams in regions of Intensity 8(0.2 g),with and without considering the stiffness reduction of the coupling beams,were designed.Nonlinear dynamic response analyses of two typical frame-wall structures subjected to several ground motions were carried out.The analyses were based on the quasi-tridimensional program for nonlinear dynamic response analysis TS-EPA.The analyses led to the following conclusions: Under rare earthquake actions,the coupling beams in framewall structures yield first.This shows that the coupling beam in frame-wall structures is the member at the forefront of earthquake resistance.Comparison of the analytic results of two couples with and without considering the stiffness reduction of the coupling beam found that,in view of the dynamic response to and the requirement for ductility under rare earthquake motions,reducing stiffness causes a minor unfavorable influence on the dynamic response of frame-wall structures.     

不同生境中紫茎泽兰幼苗的动态特征

为了研究入侵植物紫茎泽兰生长瓶颈阶段幼苗在不同生境中的适应性动态变化,在四川省德昌县比较研究了非农作的林区、农林交错带及撂荒地3种生境下紫茎泽兰幼苗适应各自不同环境的生长特征。结果表明：（1）幼苗的增长有2个高峰：第1个阶段为7月中旬到9月中旬,第2个阶段为翌年春季进入3月份以后,2个高峰之间为平缓增长期。（2）林区内幼苗的生物量增速均显著低于其余2个生境;而撂荒地和农林带生境增速在第2个生长高峰前相近,之后农林带的生物量增速显著高于撂荒地。（3）越冬生长1年后农林带幼苗密度显著高于其余2个生境。从而说明农林交错带是最适合紫茎泽兰幼苗生长的,也是最容易被入侵的生境。