杉木无性系生长与材性测定的适宜无性系株数与小区株数

对 1块 7年生杉木无性系试验林在不同无性系株数、小区株数抽样下 ,进行树高、胸径、材积及木材密度的无性系排序、遗传参数估算 ,并作效果比较 ,结果如下 :对于生长量测定 ,适宜无性系株数应在 2 0株以上 ,以 30株测定效果较佳 ;适宜小区株数在不同无性系株数下 ,结果不太一致 ,普遍表现为参试无性系株数少 ,宜采用少株小区 ;参试无性系株数多 ,则宜采用多株小区。试验株数为 6、12、2 4株时 ,分别采用 2、4、3或 4株小区的效果较好。对于测定木材密度的适宜无性系采样株数宜在 6株以上 ,而适宜小区采样株数为 1株 。

Enhancement of Rice Germplasm by Pyramiding the Cultivars with Multi-resistance to Orseolia oryzae (Wood-Mason)

[ Objective] This study was to breed rice cultivars with multi-resistance to Orseolia oryzae （Wood-Mason）. [ Method] The Guangxi local cultivar GX-M001 （Jiangchao） with high resistance to Orseolia oryzae （Wood-Mason） was used to hybrid with the known resistance cultivars ＂Kangwenqingzhan＂ （harboring GM5 gene）, OB677（ harboring GM3 gene） from Sri Lanka, HT1350 and high yield end quality cultivar ＂ Guiruanzhan＂. [ Result] Through pyramiding the multi-resistant genes via routine hybridization, the general resistances of the hybrids were remarkably enhanced. The grades of resistance were also improved, many of the combinations were endowed with a resistance at immune level （grade 0） ; and interestingly, the respective hybridization of GX-M001 （high resistance） with OB677（ medium resistance） and HT1350（suscepti- ble） also generate two lines at immune level, which is probably the effects of additive effects of genes.[ Conclusion] By routine hybridization, multiple genes were successfully pyramided, thus generating novel rice lines with multiple resistances. For the rice breeding scientists at the grass-roots level, the resistance-resistance pyramiding is an effective approach to breed high resistance cultivars.

Molecular Markers and Agronomic Traits of a New Kind of Genic Male Sterile Material Mian 7AB-4-2 in Brassica napus L.

[ Objective] The study was to investigate the agronomic traits and breeding characteristics of genic male sterile material Mian 7AB-4- 2 in Brassica napus. [ Method] The differences in agronomic traits and polymorphisms in SSR markers, between the genic male sterile material Mian 7AB-4-2 in Brassica napus and its sisterly line Mian 7AB-4-1 were investigated by hybridization and molecular identification; and the percentage of sterile individuals of Mian 7AB-4-2 and of the hybrids with its sisterly line Mian 7AB-4-1 from test cross and back cross were also studled. [ Result] Mian 7AB-4-2 was not significantly different in agronomic traits from its sisterly line Mian 7AB-4-1 at 0.05 probability level. The per- centages of sterile individuals in the pollinated fertile Mian 7AB-4-2 plants were over 60%, and that in its sisterly line Mian 7AB-4-1 was about 25%. In test crosses with other nine sterile lines, Mian 7AB-4-1 kept the percentage of sterile individuals of sterile lines over 90%, and the percentage of sterile individuals from back cross over 80%. With regard to molecular markers, Mian 7AB-4-2 and its sisterly line Mian 7AB-4-1 were different in the band number from SSR primers a2 and E10. [ Conclusion] The results indicate that Mian 7AB-4-2 is helpful for rapeseed breeding, quickening the application of new materials in field breeding.

林科院国旭集团签战略合作协议

2017年4月7日，广西林科院与国旭集团签订战略合作协议。双方将联合申报和实施科研项目，重点在原料林种植栽培、生长监测、材性测定及林木土壤环境监测等领域，以产品制造和质量提升技术相关研究作启动项目，以研发功能性人造板为切入电设立科研项目，并联合制订、修订产品及相关检验检测标准。

Research on inspection of stability of subsiding area in composite rock-mass roadway

The research concentrates mainly on the development of failure process in composite rock-mass through acoustic emission, convergence inspection, stress measurement, subside area measurement, level measurement in the process of stability and safety monitoring as well as inspecting of subside area in composite hard rock. In terms of the modern signal analysis technology, various aspects are discussed. The monitoring result and the stability of rock mass can be synthetically evaluated and inferred, and the location of acoustic origin according to the acoustic emission regularity can be successfully detected. Finally the key factors of the deformation can be inferred from in subside area.

Determination of the Orthotropic Material Behavior of Stator Bars and of the Material Characteristics of the Space Brackets

The end windings of generators are excited to vibrations due to electromagnetic forces which can cause severe damage （especially in case of resonance） and noise. To avoid this, it is important to predict the natural frequencies and modes of the end windings with finite elements during the design process. Hence, a material model of the complete stator bar is necessary. This paper shows the development of such a material model. The composite structure of a stator bar is quite complex and makes it impossible to provide a quick calculation of the eigenvalues. That is the reason for using a suitable, homogeneously, geometry based solid model. Special attention was paid to the experimental determination of the material characteristics of the orthotropic composite space brackets. The numerical results have been evaluated against measurements. Eigenvalues, Young＇s modulus, and shear modulus have been experimentally investigated.

Quantitative description of infrared radiation characteristics for solid materials subjected to external loading

Based on the thermodynamics theory and physical micro-properties of solid materials subjected to external loading at room temperature,a formula of calculating temperature difference of infrared radiation in terms of the sum of three principal strains was deduced to quantitatively investigate the infrared radiation characteristics in test. Two typical specimens,the three-point bending beam and the disc pressed in diameter,were tested and their principal strains were calculated by finite element method in order to obtain the temperature differences of infrared radiation. Numerical results are in a good agreement with test results,which verifies the validity of the formula of calculating temperature differences of infrared radiation and the model of quantitatively describing the infrared radiation characteristics of solid materials,and reveals the corresponding inner physical mechanism.

Modified Fisheye Optical System

A design for a fisheye optical system is modified in order to enable IR vision in addition to the visible and UV lighting. The proposed modification goes to replace the optical material of the movable lens by another with less thermal dispersion. The choice of appropriate materials lead to a good focus appeared on the retina for a wide spectral range includes UV, visible, and near IR lighting. Then, the performance of the modified design is verified through some optical measures for imaging quality determinations. These optical measures are determined with the aid of Zemax software, which also used for testing performance of the modified fisheye optical system. The analysis mainly focuses on the energy distribution in the light spot on the focal surface. The results show that the modified design of the fisheye is acceptable.

On determination of the damping factor of linear viscoelastic materials using dynamic indentation:a theoretical study

In this study,we theoretically investigate the dynamic indentation for measuring the loss (damping) factor of a linear viscoelastic material from its indentation response.A rigid indenter with arbitrary tip profile is assumed to indent into a viscoelastic substrate with arbitrary shape.We perform a theoretical analysis and identify the conditions under which the loss factor of the material can be determined from the phase angle between the applied harmonic indentation load and the corresponding harmonic displacement,a directly measurable quantity in a dynamic indentation test.To validate the conclusion drawn from our theoretical analysis,a series of numerical experiments are performed,including the spherical indentation of a soft layer with irregular surface morphology bonded to a rigid substrate,a conical indenter with tip defects indenting into a half-spherical particle,and the indentation of porous materials.This study may facilitate the use of the dynamic indentation technique to evaluate the damping properties of linear viscoelastic materials,including some advanced polymers and biological soft tissues.

Oxalate contents of commonly used Chinese medicinal herbs

OBJECTIVE:To assess the total and soluble oxalate contents of commonly used Chinese medicinal herbs.METHODS:Twenty-two Chinese medicinal herbs were extracted in both acid and water prior to determination of total and soluble oxalate,respectively.Oxalate was assayed in herbal extracts using a well-established enzymatic procedure.RESULTS:Among the 22 medicinal herbs,there was significant variation in oxalate content;Houttuynia cordata contained the highest amount of soluble oxalate(2146 mg/100 g) and Selaginella doederleinii contained the lowest amount(71 mg/100g).CONCLUSION:The results indicated that different Chinese medicinal herbs,even from the same family,contain significantly different amounts of oxalate.In susceptible individuals,the use of medicinal herbs with the highest oxalate contents could increase risk of kidney stone formation.