The role of submandibular glands on extrarenal erythropoietin production

Resumen La extirpación de las glándulas submandibulares en ratas machos nefrectomizadas produjo una marcada disminución en la actividad eritropoyética del plasma, medida por la incorporación de⁵⁹Fe en ratones policitémicos. Este hallazgo es compatible con la formación de eritropoyetina extra renal en esas glándulas salivares.     

线性物理过程中对立面的存在形式

对线性的物理过程中对立面的存在形式,以及对立面的对立,联系形式之演化,进行了详细探讨,这一研究将进一步深化对物理深化过程的认识。     

Cluster Differences Unfolding for Two-Way Two-Mode Preference Rating Data

Classification and spatial methods can be used in conjunction to represent the individual information of similar preferences by means of groups. In the context of latent class models and using Simulated Annealing, the cluster-unfolding model for two-way two-mode preference rating data has been shown to be superior to a two-step approach of first deriving the clusters and then unfolding the classes. However, the high computational cost makes the procedure only suitable for small or medium-sized data sets, and the hypothesis of independent and normally distributed preference data may also be too restrictive in many practical situations. Therefore, an alternating least squares procedure is proposed, in which the individuals and the objects are partitioned into clusters, while at the same time the cluster centers are represented by unfolding. An enhanced Simulated Annealing algorithm in the least squares framework is also proposed in order to address the local optimum problem. Real and artificial data sets are analyzed to illustrate the performance of the model.     

Arithmetization and Rigor as Beliefs in the Development of Mathematics

With the arrival of the nineteenth century, a process of change guided the treatment of three basic elements in the development of mathematics: rigour, the arithmetization and the clarification of the concept of function, categorised as the most important tool in the development of the mathematical analysis. In this paper we will show how several prominent mathematicians contributed greatly to the development of these basic elements that allowed the solid underpinning of mathematics and the consideration of mathematics as an axiomatic way of thinking in which anyone can deduce valid conclusions from certain types of premises. This nineteenth century stage shares, possibly with the Heroic Age of Ancient Greece, the most revolutionary period in all history of mathematics.     

一种常见现象的力学分析

滚子与障碍物碰撞后会上跳是日常生活中常见的现象,本文借用理论力学中的拉格朗日方程,阐述滚子碰撞后质心的速度及其变化,从而分析滚子上跳的原因和消除或减少这种上跳的途径。     

A Fuzzy Logic-Based Framework for Route Choice in Vehicle Navigation Systems

1　IntroductionThemainpurposeofVehicleNavigationSystems(VNS)isbyprovidingreasonablereal-timeinformationoftransportandrecommendingsatisfactoryroutechoicestoenhancetheuseefficiencyoftransportnetworkandtrulyachievethetheoreticalequilibriumoftransportationassignment.Toreachthistarget,thebuilderofVNSmustrealizethatonlywhenalotofdrivershaveusedVNS,cantheperformanceoftransportnetworkbeenhanced.Otherwise,theoperationoftotalnetworkisstillindisorder.So,themarketingvalueofVNSisveryimportanttothesuc…     

快慢型Van der Pol系统动力学行为的慢流形控制

针对快慢型Van der Pol系统，提出了注入反馈的慢流形控制方法．从几何角度出发，参照系统慢流形选择控制参数，就能将Van der Pol系统控制到指定的平衡态或振荡周期轨道上．     

一种新型高智能实时光纤网络监控系统

从传统监控系统的缺陷出发，提出利用HFC（混合光纤同轴）光纤作输主干线，由GBP网络构成多目标优化监控网络，其可靠性高，适时性强，具有实习的学习功能，能处理多相位复杂情况，具有预测性及模糊智能监控能力。     

High-throughput synthesis and catalytic properties of a molecular sieve with 18- and 10-member rings

Crystalline molecular sieves with large pores and high adsorption capacities have many potential applications. Of these materials, zeolites are of particular interest owing to their stability in a wide range of experimental conditions. An aluminophosphate with very large circular channels(5) containing 18 oxygen atoms (18-ring channels) has been synthesized, but in the search for large-pore zeolites, most of the materials which have been synthesized up to now contain only 14-ring channels; the synthesis of zeolites with larger ring structures has been believed to be hindered by the low Si-O-Si bond angles available. A silicogaloaluminate (ECR-34) with unidirectional 18-ring channels was recently reported, but exhibited low micropore volume, thus rendering the material less attractive for catalytic applications. Here we report the structure and catalytic activity of the silicogermanate zeolite ITQ-33; this material exhibits straight large pore channels with circular openings of 18-rings along the c axis interconnected by a bidirectional system of 10-ring channels, yielding a structure with very large micropore volume. The conditions for synthesis are easily accessible, but are not typical, and were identified using high-throughput techniques.     

变频调速系统中电机主回路电流的检测处理和保护

本文给出了一种三相异步电动机变频调速电源中电机主回路电流的采样,信号处理,以及状态输出的实用电路。