花生种肥试验研究

花生施种肥是花生增产的一项重要技术措施,一般可使花生增产10%以上。但在花生生产实践中,往往不能因肥料种类而施,施肥量不科学,出现肥料烧种、造成缺苗断垅而导致花生减产。针对这一问题,开展了利用尿素、磷酸二铵、复合肥三种常用化肥做种肥的试验研究,现将试验结果报告如下。     

抗性淀粉挂面复合配方的优化

抗性淀粉是一种优良的新型膳食纤维食品添加剂。为研制出一种新型的具有保健功效的抗性淀粉挂面,以挂面的感官品质、烹饪损失以及熟断条率为试验评价指标,研究抗性淀粉添加量、食盐添加量、谷朊粉添加量、海藻酸钠添加量对挂面品质的影响。通过单因素试验和正交优化试验得到挂面的最佳配方为抗性淀粉添加量8%,食盐添加量2%,谷朊粉添加量3%,海藻酸钠添加量0.3%。验证试验得到的面条色泽、口感良好,与普通挂面相比,面条烹饪损失率降低了32.2%,熟断条率降低了53.3%。     

气体射流冲击技术在果蔬干燥中的应用

干燥处理是果蔬加工的一项重要技术,气体射流冲击作为一种新型的干燥技术在果蔬干燥方面具有很强的优势。本文综述了目前果蔬干燥常用的技术方法及其优缺点,阐述了气体射流冲击干燥技术的原理、特点、影响因素和干燥工艺。与传统干燥方法相比较,气体射流冲击干燥技术具有对流换热系数大、干燥速度快、产品质量高、能耗低等优点,在果蔬干燥方面应用前景广阔。     

苹果片气体射流冲击干燥工艺的优化

采用一种新型的气体射流冲击干燥技术,对切片厚度6～8mm的苹果片进行了干燥试验研究。在喷嘴直径为16mm,喷嘴气流速度为16.8m/s的条件下,得出苹果片气体射流冲击干燥处理的最佳工艺参数为:喷嘴出口气体温度70℃,喷嘴与苹果片最佳距离120mm,干燥盒宽度为200mm,物料堆积高度为35mm。     

农用车辆发电机常见故障与原因

发电机是农用车辆电系的主要电源,其作用：一是给蓄电池充电;二是为启动机以外的其他所有用电设备提供电能。车用发电机可分为直流发电机和交流发电机两种。     

气体射流冲击干燥无核紫葡萄的数学模型

针对气体射流冲击干燥技术,试验研究了不同风温、风速和预处理下无核紫葡萄的4种薄层干燥模型。在对无核紫葡萄进行L9(34)正交干燥试验的基础上,通过试验数据分析,对不同风温下的干燥曲线进行模型比较,经拟合得出适合无核紫的数学模型为Page模型。     

落锤冲击气囊施加均布动荷载的试验方法

在结构构件上施加均布冲击(爆炸)荷载一直是动力试验领域的难题。提出了一种落锤冲击气囊施加均布动荷载的试验装置,和一个双自由度弹簧阻尼冲击加载简化分析模型;给出了该模型的基本力学方程、边界条件和求解方法,并进行了有限元验证;建立了所提出冲击加载试验装置的精细化有限元模型,分析了构件上各受荷区域的荷载均布情况,验证了所提出装置的可行性。基于所建立的简化分析模型,讨论了刚度、荷载作用时间和阻尼比等关键参数,对构件上动荷载的影响,并给出了基本规律。计算结果表明,在选定合适的参数后,落锤冲击气囊试验装置能够较好地模拟构件上的均布动荷载,为实验室中进行爆炸冲击试验提供了一种可能。     

甲基毒死蜱与虫螨磷对粗足粉螨与转开肉食螨的毒力测定

本试验证明,甲基毒死蜱对粗足粉螨Acarus siro与转开肉食螨Cheyletus aversor的毒力高于虫螨磷.尽管这两种杀虫剂对两种螨都有效,但转开肉食螨对这些药剂不太敏感.     

汽轮发电机稳态负序工况仿真模型及其对负序损耗计算结果的影响

稳态负序能力是大型汽轮发电机安全可靠运行的重要技术指标之一,而稳态负序损耗的准确计算是确定稳态负序能力的关键和基础。介绍了模拟发电机稳态负序运行工况的传统模型,针对其不足提出了一种新的不对称负载模型,并对2种模型所反映的物理机理和优缺点进行了对比分析。在此基础上,以一台1 550 MW的大型4极核能汽轮发电机为例,采用场路耦合的二维非线性时步有限元方法,结合2种仿真模型对其稳态负序损耗分别进行了计算,并对计算结果进行了详细分析。结果表明：相对于传统的负序模型,笔者提出的不对称负载模型充分考虑了磁饱和与转子附加损耗的影响,计算出的稳态负序损耗更接近实际情况,为准确考核大型汽轮发电机的稳态负序能力奠定了基础。     

大枣开甲试验初报

枣树开甲投资少,增产显着,深受群众欢迎。目前枣树开甲技术在小枣产区应用较多,大枣产区仅在近几年来部分地区推广应用。大枣在我省分布面积很大,约占枣树总面积的60%以上。研究大枣开甲技术,使之逐渐推广普及,是增产的重要措施。我们从1957年起开始进行这方面的试验研究,选择沧县婆枣、新乐大枣、行唐大枣等为试材,共做了不同立地条件、不同树龄、不同树势、不同时期和不同频率等开甲的观察调查。开     

Theoretical Analysis and Design of Resonant DC Base High Frequency Inverter

A theoretical analysis of the Resonant DC Base High Frequency Inverter is given. A optimal control scheme for the short circuit current of the resonant inductor is proposed. The system parameters,output current,output voltage and characteristics of the Resonant DC Base in this scheme are analysed. In the theoretical analysis the load is supposed as a resistor to void the calculating error while the load is treated as a constant current source. The analysis and test result have proved that the optimal parameters of the Resonant DC are only determined by the load resistance and the output frequency.     

A fault data recording system design for hybrid electric vehicles

A data recording system for fault diagnosis of hybrid electric vehicles was studied by taking the integrated starter and generator (ISG) hybrid electric vehicle as the investigation object. The fault diagnosis communication net was established using a CAN bus and a K line. As designed, the system hardware structure included a CPU processing module, a communication module, and a USB recording module. With the system requirements and characteristics in mind, special circuit design and analysis of USB mass storage module were carried out based on the hardware scheme and software design. In the running test, the fault data recording system worked stably, and the data was recorded integrally and correctly. At the same time, the online display data accurately reflected the vehicle's running status.     

The Research on Pretreatment and Cycle Stream of Control for CAT and CNC

A new idea "Pretreatment and cycle stream of control" and the scheme to put it into practice is presented. In space region,the circuit is designed to form chain and cycle,and in time region,the program is designed to distinguish the period and the instant.It is ensured that the pretreatment will be finished in the period and there is always a circuit to wait to the triggered at the instant. So the respond speed of the system is almost approximate to that one of trigger circuit.     

Approach for Calculating Short Circuit on Transrmission Lines by Using Piece-wise Method with Structure Network Fault

Based on the properties of linear network,a new generalized diakoptical modeland its algorithm are presented in the paper to calculate short circuit at the arbitrary location on anytransmission line of large-scale power systems,in which the proposed techniques of transferring faultport current,and modifying nodal current sources and column impedence elements, are appliedcomprekensively. The method given here is espocially efficient to calculate short circuit in piece-wisemethod for any mutually coupled cuts between subdivisions in the system with constant or variablestructures. And it is an important improvement for short-circuit current calculation.     

影响油炸豌豆破碎率及感官特性因素的分析

豌豆在油炸过程中会产生破碎现象,这不仅对产品的外观和感官乃至口感均有较大的影响,而且造成了不同程度的浪费。对影响油炸后豆瓣破碎率及感官的因素进行了分析与总结,并通过正交试验确定了油炸豆瓣的最佳工艺参数,即:豌豆水分含量55.0%,油炸温度160℃,油炸时间490 s,送料频率38.0 Hz,可达到豌豆的破碎率最低、产品的外观和口感最佳的效果。     

Research on grey correlation analysis for cleaner production

The current methods used to select the schemes for Cleaner Production in China have some disadvantages. This paper presents the Grey Correlation Analysis and constructs a new index system for Cleaner Production schemes. The environmental index, the economic index, etc., and technical index, are quantifyed and minimized. Each scheme is compared with the evaluation standard. The optimal scheme which has the largest correlation with the evaluation standard. The result shows that the Grey Correlation Analysis can effectively avoid the subjective bias on the scheme selection for Cleaner Production. Schemes for Cleaner Production selected by the Grey Correlation Analysis have better performance than those selected by the traditional method in terms of economic, environmental and technical indexes.     

HIGH SPEED CALCULATIONS OF SHORT CIRCUIT FOR POWER SYSTEMS WITH VARIABLE STRUCTURES AND PARAMETERS

This paper presents a new method for digital simulation of equivalent circuit parameters and port currents of the short circuit fault port for each sequence networks in power systems with variable configuration and parameters. If the electric values for single-line-to-ground short ciruit are calculated in detail,the other faults at the same location can be rapidly obtained by using the proportional coefficients of the same sequence port current. In this method,the modifications of Z-bus or Y-bus matrices for each sequence network, and the repeated of calculations of the short circuit calculation have been completly avoided.     

Commutation Failure Factors Analysis In HVDC Transmission System

Commutation failure is one of the most common faults in HVDC transmission system, which is affected by many factors. This paper analyzes the effects of some major factors, such as voltage of commutation bus, DC current, advance firing angle, short circuit impedance and ratio of converter transformer, on the commutation failure in the inverter in HVDC transmission system. The obtained general rule of commutation failure in the inverter in HVDC transmission system is helpful to practical operation.     

Design of data acquisition and communication system for AMTcomprehensive performance test bench

AMT (Automatic Manual Transmission) comprehensive performance test is one of the main means to develop and evaluate AMT. An overall scheme of the data acquisition and communication system for AMT comprehensive performance test bench is proposed according to the requirement of the test bench, and a communication network of data acquisition and communication system is built. The hardware and software of data acquisition system are designed. The experiments show that the system meets the requirement of data acquisition and communication system for AMT comprehensive performance test bench and it lays a foundation for AMT comprehensive test research.     

Experimental Analysis of the Electro-Osmosis Consolidationof Soft Clay Under Anode Follow-up

Under the equipotential premise gradient, anode follow-up technical was proposed in the electro-osmosis reinforcement of soft clay. Eight electro-osmosis contrast tests were conducted through the experimental test. Currently, shear strength, displacement, moisture content, pH, conductivity of the soil and other indicators were monitored in the electro-osmosis test. Different electro-osmotic reinforcement effects were analyzed. The results show that: when the anode follow-up is used, the first anode follow-up can get a most significant effect. When the current density is high, arranging the anode follow-up will lead some extent reduce of the effect of the electro-osmosis, while the effect will be promoted when the current density is low. By carrying out the anode follow-up on the cathode region soil, a significant reinforcement effect can be obtained. Anode follow-up can reduce the resistance of the circuit in the anode region and effectively promote the electro-osmosis reinforcement effect.