A NON-DUALISTIC UNIFIED FIELD THEORY OF GRAVITATION,ELECTROMAGNETISM AND SPIN

The wisdom of classicalunified field theories in the conceptual framework of Weyl,Eddington,Einstein and Schrodinger has often been doubted and in particular there doesnot appear to be any empirical reason why the Einstein-Maxwell(E-M)theory needs to begeometrized.The crux of the matter is,however not whether the E-M theory is aestheticallysatisfactory but whether it answers all the modern questions within the classical context.Inparticular,the E-M theory does not provide a classical platform from which the Diracequation can be derived in the way Schrodinger’s equation is derived from classicalmechanics via the energy equation and the Correspondence Principle.The present paperpresents a non-dualistic unified field theory(UFT)in the said conceptual framework aspropounded by M.A.Tonnelat.By allowing the metric form ds~2=g_u,dx~(?)dx~v and thenon-degenerate two-form F=(1/2_1)φfdx~u∧dx~y to enter symmetrically into thetheory we obtain a UFT which contains Einstein’s General Relativity and the Born-Infel     

两种不同线栅结构的水平极化辐射波模拟器

比较了末端收拢和均匀拉线的双锥-平面线栅水平极化辐射波模拟器辐射场的分布规律,讨论了拉线根数和收拢组数对辐射场的影响。结果表明,双锥中心正下方测点辐射场基本不受线栅结构变化的影响。对于其他位置,两种结构的模拟器各有特点:拉线根数相同时,末端均匀拉线的模拟器可令辐射场强提高约5%～20%,但前沿会变慢10%左右;末端收拢的模拟器场强幅值相对较低,但具有较快的前沿,并且架设相对容易。增加拉线根数和收拢组数有利于提高辐射场强,但场强增加的幅度逐渐减小。拉线根数由24增加到96时前沿可加快约10%,半宽变化不大。增加收拢组数会使前沿变慢。综合辐射场变化规律及施工难易程度,可令末端均匀拉线模拟器的拉线根数取48,此时对收拢结构的天线,可令收拢组数取16。     

高功率反向开关晶体管开关寿命特性

研制了10 kV高压反向开关晶体管（RSD）开关组件。在重复频率0.2 Hz、峰值电流约107 kA、峰值功率约1 GW、单次传输电荷约20 C、单次传输能量约100 kJ条件下,实验次数达50 000多次;主要研究了RSD开关的静态伏安特性随实验次数的变化趋势。采用数值分析的方法,统计拟合得到了长脉冲大电流条件下RSD开关的寿命模型,并依据失效判据初步预估RSD开关的寿命可达107次。     

数理统计方法在电表磁钢热处理中的运用

磁钢是电表中的关键零件。我厂用熔模铸造法生产的磁钢毛坯是铝镍系永磁材料,用于我厂自产的DD28型民用电表中.磁钢毛坯自八一年底在我厂批量生产后,热处理后磁性能 (厂标为:矫顽力 Hc≥500Oe,剩磁 Br≥5800Gs,最大磁能积(BH)max≥1.2 × 106GO)一次合格率很低,当时仅为35.3%。结果使能源超耗,成本上升,生产被动,在电表装配中磁钢供不应求,不得不外购,造成资金外流,经济效益变差。 八二年五月我们成立了QC小组.通过对大批测试数据的观察,发现不合格的磁性能中99.23%是矫顽力 Hc低于厂标,而剩磁 Br却大大高于厂标.经过作散点图及回归分…     

VECTOR ANALYSIS OF SPATIAL MECHANISMS—(Ⅱ) CONFIGURATION ANALYSIS OF SPATIAL MECHANISMS BY MEANS OF THE METHOD OF VECTOR EQUATIONS

In this paper.the configurations of the P-P-G-C and the R-G-C-R Mechanisms are established by the method of vector equa-tions.As in Part1,explicit solutions in terms of givenvectors are obtained,independent of the polynomial equationsof the kind obtained by Chace.     

VECTOR ANALYSIS OF SPATIAL MECHANISMS——(Ⅲ) Kinematics of Spatial Mechanisms

The instantaneous kinematics for the spatial mechanismsconsidered in Parts1 and2 are established via straightfor-ward vector algebra.     

A STUDY OF THE IONOSPHERIC DATA OBTAINED AT WUCHANG-SEPT. 1946 THRU. DEC. 1947

Routine hourly observations of ionospheric characteristics have been taken at Wuchang since August 20. 1946. In this paper a general analysis of the data obtained from September 1946 through December 1947 is attempted. The diurnal and seasonal variations of ionization density and virtual height for all regular layers (E, F-l, F-2) are plotted in diagrams and briefly explained. Deviations from the normally recognized characteristics are discussed in more detail.Besides the normal characteristics, some special phenomena such as the occurrence of E₂ near Sunrise and two major ionospheric storms are briefly described. Comparatively detailed study is made on the sporadic E ionization, with the conclusion that its percentage time of occurrence before mid-night is more than that after mid-night and that it is more prevalent in autumn than in any other season. Abnormally high E₃ ionization was observed on October 10, 1946 when the Giacobini-Zinner comet was nearest the Earth. These facts indicate that metenrs are probably important agents in producing sporadic E jouization.     

盘式触发电极触发管开关的触发特性

 对采用盘状触发电极的新型触发管开关的触发特性进行了实验研究,得到不同极性组合、不同触发电压幅值和不同触发电流条件下开关的触发特性实验结果。实验结果表明:新型触发管开关获得最佳触发特性所需的极性组合应为异极性组合,触发电压幅值范围为自击穿电压的30%~50%,为兼顾触发电流和保护触发器,触发电阻值应为50~100 Ω,验证了触发管开关击穿机制的已有认识。     

激光辐照对湛江等鞭金藻的复壮作用及机制研究

用Nd∶YAG激光（波长1.06 μm,功率密度6 W/cm2）对长期保存的湛江等鞭金藻藻种进行辐照处理.研究了激光辐照对藻生长和生理生化特性的影响,并从藻细胞的超微结构和自体荧光特性的变化探讨了激光复壮藻种的可能机制.实验结果表明：辐照剂量为30 s~60 s时,有较好的复壮效果,藻种的生长速率、细胞干重、叶绿素、类胡萝卜素及蛋白质等含量均较对照组有不同程度的提高,增幅约25.3％～48.3％.激光复壮后的藻细胞,线粒体数量增多,光合片层进一步发育.辐照剂量增至90 s时,胞内脂质颗粒增加.藻种的自体荧光光谱中,波长682 nm处的荧光强度明显增强.此结果说明,利用激光的“筛子”与诱变作用,可以提高饵料藻种的生物品质.