Breeding and Utilization of Japonicalinous CMS Line Chunjiang 19A with Wide Compatibility and High Outcrossing Rate

[Objective] To breed and utilize the japonicalinous cytoplasmic male sterile （CMS） line Chunjiang 19A with wide compatibility and high outcrossing rate. [Method] Cbunjiang 16A was used as the female parent to cross with Indica-Japonica crossing material B125, which was used as male parent. Backcross breeding was contin- ued for consecutive generations to breed the CMS lines with wide compatibility and high outcrossing rate. [Result] Chunjiang 19A is a late medium Japonica CMS line with good fertility stability. The proportion of sterile plants and pollen abortion rates are 100% and the Cheng＇s index is 14. It is the japonicalinous CMS line with early flowering, partial stigma exsertion, high outcrossing rate, wide compatibility, high re- sistance to stripe disease and good combining ability. The hybrid rice combinations originated from Chunjiang 19A have strong tUlering ability, dominant heterosis, high resistance to stripe disease, great yield potential and good color change at mature stage. [Conclusion] The successful breeding of Chunjiang 19A laid good foundation for the breeding of Japonica hybrid rice and Indica-Japonica hybrid rice combinations with high seed production and dominant heterosis, showing a promising application prospect.

A Uniform Reference Line Based Differential Phase Shifter with Wide Phase Range and Wide Bandwidth

To implement the multi-way phase shifting maintaining the compact size and simplicity in structure,the uniform reference line concept was proposed for the differential phase shifter.However,the performance in bandwidth and phase range deteriorates with the additional requirements considered.To solve this problem,a quarter wavelength coupled line section loaded with open/short stubs is proposed as the basic element to implement the main line and also reference line.According to the theoretical analysis on this basic element,the loading stubs can be used to control the phase shift and also the phase slope of the basic element without affecting the amplitude property.With the predetermined parameters of the uniform reference line,only two parameters are required for the implementation of different differential phase shifts.This demonstrates the high simplicity of the proposed structure.For demonstration,an eight-way differential phase shifter operating at 3.5 GHz was implemented using the vertically installed planar structure.The prototype was further fabricated and measured.Good agreement between simulation and measurement can be observed.The implemented phase shifter can provide a wide range of phase shifting values from 45°to 315°with reference to the uniform reference line over a relative bandwidth of 62.3%.

Genetic Improvement and Biological Characteristic Analysis of Dwarf Abortive TypeJaponicaCMS Lines with Wide Compatibility

From the view of methodology for genetic improvement ofJaponicacytoplasmic male sterile(CMS) lines,we introduced the breeding process of the dwarf-abortive type(DA type)JaponicaCMS line Chunjiang 95A with wide compatibility,and further investigated the biological characteristics of the DA type Chunjiang 95A and its isonuclear alloplasmic CMS line Dian-I type Chunjiang 95A.The results show that DA type Chunjiang 95A is a japonicalinous CMS line and mainly typical abortive,which is better in fertility stability than stained abortive typeJaponica CMS lines.The DA type Chunjiang 95A is featured with high stigma exsertion,good flowering habit,high outcrossing rate and wide compatibility.Its recoverability differs from stained abortive typeJaponicaCMS lines.Moreover,we discussed genetic improvement of the typical abortive type JaponicaCMS lines and the application prospects of heterosis.

Design of wide-range energy material beamline at the Shanghai Synchrotron Radiation Facility

We report the design of a wide-range energy material beamline(E-line) with multiple experimental techniques at the Shanghai Synchrotron Radiation Facility.The undulators consisted of an elliptically polarizing undulator and in-vacuum undulator that generate the soft and hard X-rays, respectively. The beamline covered a wide energy range from 130 to 18 ke V with both a high photon flux([ 10^(12) phs/s with exit silt 30 lm in soft X-ray and [ 5 9 10^(12) phs/s in hard X-ray within 0.1%BW bandwidth) and promising resolving power(maximum E/DE [ 15,000 in soft X-ray with exit silt 30 lm and [6000 in hard X-ray). Moreover, the beam spots from the soft and hard X-rays were focused to the same sample position with a high overlap ratio, so that the surfaces, interfaces, and bulk properties were characterized in situ by changing the probing depth.

ACOUSTICAL TRANSMISSION LINE MODEL FOR ULTRASONIC TRANSDUCERS FOR WIDE-BANDWIDTH APPLICATION

An improved model for ultrasonic transducers is proposed. By considering only the first symmetric mode, each layer is represented as an acoustical transmission line in modeling of bulk wave transducers. In imaging applications, wide bandwidth and short time duration are required. The approach we have used consists of impedance matching the front face of the piezoelectric transducer to the propagating medium with a quarter wavelength impedance matching layer and inserting an nnmatching quarter wavelength acoustical layer between the rear face and backing material. A heavy backing would degrade the wide-band phenomena, but show a time duration shorter than 0.5 μs for imaging applications. PSPICE code of the controlled source model is implemented to precisely predict the performance of the matched transducers such as impedance, insertion loss, bandwidth and duration of the impulse response. Good agreement between the simulation and experimental results has been achieved.

Analysis on the Breeding and Major Traits of Wide-adaptability Indica CMS Line Yungu 3A

Breeding sterile lines is the key to the development of hybrid rice with wide adaptability. However, at present, few wide-adaptability sterile lines have been applied in production practice. In this study, Yungu 3A, a new WA-type Indica CMS line with good grain quality, was developed by hybridization between Yunfeng 66A with wide adaptability as female parent and F1 plants of Yunfeng 66B/D62B as male parent and continuous backcrossing. According to the results, the finally obtained lndica CMS line Yungu 3A has good plant type and leaf shape, strong tillering ability, excellent flowering habit, stable and complete male sterility with the sterile plant rate and pollen sterility rate of 100%, strong combining ability, high outcrossing rate, low sensitivity to light and temperature, and strong disease resistance, which was approved by Yunnan Provincial Crop Variety Appraisal Committee in 2013. Yungu 3A is conducive to the development of new hybrid rice combinations with good quality and wide adaptability, exhibiting a promising prospect of application.

Verification of Glyphosate Resistance, Lepidopteran Resistance and Wide Compatibility of Male Sterile Line E1C4008S in Rice

Weeds and insect pests are two important biotic stresses resulting in yield loss in rice, and wide compatibility is the essential characteristic of breeding inter-subspecific hybrid rice. This study focused on glyphosate resistance, lepidopteran resistance and wide compatibility as well as identification of molecular and some agronomic characteristics of transgenic male sterile line E1 C4008 S. The results indicated that glyphosate resistance gene Epsps^# and lepidopteran resistance gene Cry1 ca^# were transferred into japonica wide compatibility male sterile line 4008 S by Agrobacterium-mediated method, and four independent transformation events named E1 C4008 S-1, E1 C4008 S-2, E1 C4008 S-3 and E1 C4008 S-4 were obtained, in which E1 C4008 S-3 and E1 C4008 S-4 were of single copy insertion. The EPSPS protein contents of E1 C4008 S-3 and E1 C4008 S-4 in different organs were significantly different both in descending order of leaf > stem > root, and ranged from 300.58 to 1410.69 μg/g at the tillering stage. The glyphosate tolerable concentration(dosage) of E1 C4008 S-3 and E1 C4008 S-4 reached at least 16 g/L(54.42 kg/hm^2), and the seeds of E1 C4008 S-4 can germinate normally on the medium containing 1 g/L glyphosate. The CRY1 C protein contents of E1 C4008 S-3 and E1 C4008 S-4 in different organs were significantly different both in descending order of leaf > stem > root, and ranged from 0.62 to 2.43 μg/g at the tillering stage. The larvae mortalities of rice leaf rollers fed on leaves of E1 C4008 S-3 and E1 C4008 S-4 for 5 d were 95.35% and 97.77%, respectively, while the average mortalities of silkworms fed with protein extracts from leaves of E1 C4008 S-3 and E1 C4008 S-4 reached 94.55% and 83.64%, respectively. The results suggested that wide compatibility and evaluated agronomic traits of E1 C4008 S-4 were not significantly changed by insertion of the exogenous genes. Overall, a novel male sterile germplasm with glyphosate resistance, lepidopteran resistance and wide compatibility was verified to be developed in rice.

Minimizing crosstalk for high-speed and high-density bus systems using the sample-decision method

This paper presents a method based on a sample-decision(SD) circuit to suppress crosstalk and noise for a high-speed and high-density bus system.A method to count the number of times of SD for different length of transmission lines is presented and a bit error rates(BERs) formula is given by the SD circuit.It is shown that for long transmission line systems,multiple SD circuits can improve the BERs significantly.Circuits simulation for single SD method is also done,it is found that when the amplitude peak values of the superposed crosstalk and noise are less than half of the corresponding signal ones,they will be eliminated completely for the cases investigated.

Selection of wide compatible restorer lines and their application in hybrid rice breeding

Since the middle of 1980’s, wide compatibility(WC) rice lines have been screened by ricebreeders in China and applied in hybrid ricebreeding program. Several WC lines such asPecos, T984, Lunhui 422, and 02428 withideal agronomic characters were identified. Weincorporated the WC gene into restorer linesby crossing these japonica WC lines with ob-tained indica lines. Some WC restorer lineswith indica-japonica medium type were ob-tained and their application value in intersub-specific hybrid rice breeding were evaluated. 1. Effect of crossing methods on selectionefficiencies of WC restorer lines

A male sterile line with wide compatibililiy 064A was bred

A male sterile line with wide Compatibility,064A was successfully bred in CNRRI which not only has good compatibility with japonica and indica rice but also has stable and high sterility and good flowering habit. High yield had been obtained when 064A was crossed with an indica restore line, Minhui 63 or a japonica restore line, 9512. This new male sterile line is anticipated as a very promising material for developing super—high yielding rice.

基于Blackman窗全相位FFT双谱线校正的同步宽频相量测量方法研究

为进一步分析电网电力电子化特征日益明显所带来的影响,电网运行状态监视向间谐波和高次谐波方向延伸,对同步宽频测量提出了更高要求。同步宽频测量广泛采用的加窗插值频谱分析方法存在频谱泄露,当基波频率发生偏移或信号中存在邻近信号时会导致较大误差。针对此问题,文中提出采用基于Blackman窗全相位FFT双谱线校正的改进宽频相量测量方法,结合全相位FFT和Blackman余弦窗对宽频信号进行频谱分析,并利用双峰谱线进行参数校正。文中方法可以有效提升频谱泄露的抑制效果,降低邻近频谱干扰,提升基波频偏或邻近频谱的复杂运行工况宽频信号参数测量精度。

基于周期性枝节加载的微带线串扰抑制研究

针对当前印刷电路板上相邻微带线之间的串扰抑制问题,提出了一种在超宽带频率范围内利用周期性耦合枝节来抑制微带线远端串扰的电磁兼容设计。在串扰的形成原因分析基础上,该设计将沿传统微带线纵向方向加载的周期性开路枝节进一步与相邻两条微带线之间周期性加载的工字型耦合枝节相结合。微带线上的开路枝节以及线间的耦合枝节主要用于增加微带线等效自感和线间等效互容,并减小线间等效互感,由此显著降低远端串扰强度。同时,线间等效互感的减小能抑制因容性耦合增大而导致的近端串扰上升。全波结果表明,该设计在1~20 GHz范围内可使相邻微带线的远端串扰强度小于-48 dB,且物理结构中不涉及金属化通孔,具有几何结构简单、成本低和可布线空间大等特点。

一种L~U波段RF MEMS单刀十掷开关的设计

论文提出了一种适用于1GHz~60GHz频段的RF MEMS单刀十掷开关。该开关采用三角形上电极结构,以减小悬臂梁等效弹性系数和闭合接触面积,达到低驱动电压、高隔离度的目的。通过渐进传输线结构,改善阶跃补偿引起的信号损耗问题。仿真结果显示:该单刀十掷开关的驱动电压为13V,在1GHz~60GHz频段范围内,输入端两侧输出端口的插入损耗<2dB,其余八个端口插入损耗≤0.59dB,所有端口隔离度均>30dB。此开关可适用于无线通信系统、雷达系统和仪器测量系统等对射频性能要求高的领域内。

玉米自交系苗期根系形态鉴定及候选基因发掘

以134份玉米自交系为试验材料,对玉米的9个苗期根系性状进行表型鉴定,并利用分布于玉米基因组的44935个SNP标记,基于FarmCPU模型进行全基因组关联分析(GWAS,genome-wide association study)。结果表明9个根系性状表型变异范围在10.86%~55.96%之间,大部分表型间相关性达极显著水平(P<0.001),侧根长和总根长相关系数最高,为0.996,其次为侧根数与总根数达到0.993。共鉴定到32个显著关联的SNP位点(P=1.01e-11~9.74e-05),表型贡献率在0.54%~22.34%之间,主根长、总根长、最大根长、侧根长分别检测到4、8、3、9个显著的SNP位点;总根数、侧根数、不定根数分别检测到10、7、1个显著SNP位点;14个SNP位点同时与多个根系性状关联。12个显著关联位点位于已知根系相关性状QTL(Quantitative trait locus)区间内。共发掘49个根系候选基因,其中GRMZM2G028386(ABI4)、GRMZM2G135713(PUB23)、GRMZM5G870592(MYB98)、GRMZM2G156861(LOX1)、GRMZM2G160005(AUX16)、GRMZM2G126936(NAC2)等是重要的根系候选基因。本研究为克隆玉米根系发育相关基因,解析玉米根系发育分子机制提供了参考。

复杂构造区高质量地震采集技术探索——以下扬子无为盆地为例

为获得下扬子地块无为盆地高质量的原始地震数据,依托无为盆地2019~2020年反射地震数据,开展高密度宽线采集技术、激发技术以及层析静校正技术的实验研究,总结出一套适合无为盆地页岩气地震勘探的采集施工参数,并将其应用于研究区新部署的地震勘探工作中,获得高信噪比的地震数据。通过对数据进行Kirchhoff叠前时间偏移处理,获得高分辨率、高精度的时间域反射剖面,剖面上目的层(二叠系)反射波能量强、同相轴连续,基本可查清该区地质构造格架,为下一步无为盆地页岩气的钻探部署提供可靠的地震成像数据。

辽河拗陷大民屯凹陷S281块高密度宽线二维地震采集实践

辽河拗陷大民屯凹陷S281块X井钻井显示该块油气潜力较大,但以往地震资料采集时间早,覆盖次数较低,成像精度差,导致主体断裂位置和微断裂体系难以落实,制约区块成藏解释和后续开发.为此,开展了高密度宽线二维地震资料采集,并基于采集数据开展了观测系统退化分析.研究结果表明,新采集的高密度宽线二维地震成像剖面较以往三维地震成果剖面断点更清晰,断裂系统刻画更清楚,构造形态更自然,层间信息更丰富,信噪比更高,落实了的西部斜坡带的构造特征;超高密度、极小面元对高陡构造和断裂刻画更清楚,是提高复杂地质目标成像的有效方法;退化处理说明S281块的地震资料采集观测系统的面元边长不能大于12.5 m,最大炮检距不能小于3500 m,覆盖次数不能小于1200次.本研究可为大民屯凹陷西部斜坡带的下步地震资料采集和勘探开发提供借鉴.

Design of a Bandgap Reference with a Wide Supply Voltage Range

An on-chip voltage reference with a wide supply voltage range is required by some applications,especially that of power management （PM） controller chips applied to telecommunication, automotive, lighting equipment, etc., when high power supply voltage is needed. Accordingly,a new bandgap reference with a wide supply voltage range is proposed. Due to the improved structure,it features a high power supply rejection ratio （PSRR） and high temperature stability. In addition, an auxiliary micro-power reference is introduced to support the sleep mode of the PM chip and reduce its standby power consumption. The auxiliary reference provides bias currents in normal mode and a 1.28V reference voltage in sleep mode to replace the main reference and save power. Simulation results show that the reference provides a reference volt- age of 1.27V,which has a 3.5mV drift over the temperature range from -20 to 120~C and 56t^V deviation over a supply voltage range from 3 to 40V. The PSRR is higher than 100dB for frequency below 10kHz. The circuit was completed in 1.5tzm BCD （Bipolar-CMOS-DMOS） technology. The experimental results show that all main expectations are achieved.

离心泵宽高效水力设计方法的研究及应用

为了达到离心泵宽高效,以实现泵设备节能增效的目的。本文通过对离心泵宽高效机理的分析,揭示了离心泵宽高效的基本规律。提出了泵设计中采用叶片分区设计的方法,即叶片包角范围内共分三个区,即非控制区、过渡区和控制区。具体地讲首先设计泵叶片进口角-出口角的角度分布线,同时应用微积分方程求解方格网中的保角变换线,进而产生宽高效的离心泵叶轮型线。试验结果表明此叶轮设计方法达到了离心泵宽高效的节能特性,电动机的配套功率或输入功率变小。离心泵宽高效机理和试验都证明了离心泵叶轮的叶片进口角至出口角分布线的形状是决定离心泵宽高效的关键因素。

不锈钢宽厚板剪切线工艺布置特点

介绍不锈钢宽厚板剪切线的工艺布置形式及特点。

宽幅内衬层三辊压延设备

主要介绍了内衬层压延生产线的基本组成、工艺流程和技术参数。并详细介绍三辊压延主机及辅机各构件的工作原理及结构特点。