班班通在语文教学中的运用

信息迅猛发展的今天,多媒体计算机辅助教学已深入课堂,现代教育技术班班通的巧妙运用,更是打破了"一个黑板+一只粉笔"的原有的传统教学模式。"班班通"是通过多媒体使学校每个班级具备了与外界进行交流的能力,实现信息技术与学科日常教学的有效整合,促进教师语文教学方式和学生语文学习方式的变革,最终促进学生的发展。利用班班通网络资源与语文课堂学习相结合具有创设特定情境,激发学生的学习兴趣、化繁为简,化难为易,让学生轻松快乐学习、阅读速度加快,阅读量增多、学生深入理解文本等优势,本文结合语文阅读教学、作文教学、读写教学总结了在探索中运用"班班通"的经验和做法,创造了师生双赢的局面。     

LED充电台灯产品质量安全风险监测分析

近年来带锂离子电池的可移动式LED充电台灯引发爆炸、起火、燃烧等质量安全事件时有发生,为充分了解该类产品的质量状况,确保消费者的生命财产安全。本文选取了电商平台上销售的30批次样品进行试验、分析和评估,结果显示:样品存在标记缺失、结构不合格、耐热不合格、电池外部短路不合格等质量安全风险。依据国家相关的风险评估标准,将该类产品不同的监测项目应进行风险等级评划分,并针对风险等级程度对产品的质量提升要求提出了相关处置建议。     

CRISPR/Cas9-Mediated Generation of Pathogen-Resistant Tomato against Tomato Yellow Leaf Curl Virus and Powdery Mildew

Tomato is one of the major vegetable crops consumed worldwide. Tomato yellow leaf curl virus (TYLCV) and fungal Oidium sp. are devastating pathogens causing yellow leaf curl disease and powdery mildew. Such viral and fungal pathogens reduce tomato crop yields and cause substantial economic losses every year. Several commercial tomato varieties include Ty-5 (SlPelo) and Mildew resistance locus o 1 (SlMlo1) locus that carries the susceptibility (S-gene) factors for TYLCV and powdery mildew, respectively. The clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein (Cas) is a valuable genome editing tool to develop disease-resistant crop varieties. In this regard, targeting susceptibility factors encoded by the host plant genome instead of the viral genome is a promising approach to achieve pathogen resistance without the need for stable inheritance of CRISPR components. In this study, the CRISPR/Cas9 system was employed to target the SlPelo and SlMlo1 for trait introgression in elite tomato cultivar BN-86 to confer host-mediated immunity against pathogens. SlPelo-knockout lines were successfully generated, carrying the biallelic indel mutations. The pathogen resistance assays in SlPelo mutant lines confirmed the suppressed accumulation of TYLCV and restricted the spread to non-inoculated plant parts. Generated knockout lines for the SlMlo1 showed complete resistance to powdery mildew fungus. Overall, our results demonstrate the efficiency of the CRISPR/Cas9 system to introduce targeted mutagenesis for the rapid development of pathogen-resistant varieties in tomato.     

Integration of PV system with SMES based on model predictive control for utility grid reliability improvement.

This paper describes the integration of a photovoltaic (PV) renewable energy source with a superconducting magnetic energy storage (SMES) system. The integrated system can improve the voltage stability of the utility grid and achieve power leveling. The control schemes employ model predictive control (MPC), which has gained significant attention in recent years because of its advantages such as fast response and simple implementation. The PV system provides maximum power at various irradiation levels using the incremental conductance technique (INC). The interfaced grid side converter of the SMES can control the grid voltage by regulating its injected reactive power to the grid, while the charge and discharge operation of the SMES coil can be managed by the system operator to inject/absorb active power to/from the grid to achieve the power leveling strategy. Simulation results based on MATLAB/Simulink® software prove the fast response of the system control objectives in tracking the setpoints at different loading scenarios and PV irradiance levels, while the SMES injects/absorbs active and reactive power to/from the grid during various events to improve the voltage response and achieve power leveling strategy.     

Formation of Proto-Kranz in C3 Rice Induced by Spike-Stalk Injection Method

Introduction of C4 photosynthetic traits into C3 crops is an important strategy for improving photosynthetic capacity and productivity. Here, we report the research results of a variant line of sorghum–rice (SR) plant with big panicle and high spikelet density by introducing sorghum genome DNA into rice by spike-stalk injection. The whole-genome resequencing showed that a few sorghum genes could be integrated into the rice genome. Gene expression was confirmed for two C4 photosynthetic enzymes containing pyruvate, orthophosphate dikinase and phosphoenolpyruvate carboxykinase. Exogenous sorghum DNA integration induced a series of key traits associated with the C4 pathway called “proto-Kranz” anatomy, including leaf thickness, bundle sheath number and size, and chloroplast size in bundle sheath cells. Significantly, transgenic plants exhibited enhanced photosynthetic capacity resulting from both photosynthetic CO₂-concentrating effect and improved energy balance, which led to an increase in carbohydrate levels and productivity. Furthermore, such rice plant exhibited delayed leaf senescence. In summary, this study provides a proof for the feasibility of inducing the transition from C3 leaf anatomy to proto-Kranz by spike-stalk injection to achieve efficient photosynthesis and increase productivity.     

Next Generation Cereal Crop Yield Enhancement: From Knowledge of Inflorescence Development to Practical Engineering by Genome Editing

Artificial domestication and improvement of the majority of crops began approximately 10,000 years ago, in different parts of the world, to achieve high productivity, good quality, and widespread adaptability. It was initiated from a phenotype-based selection by local farmers and developed to current biotechnology-based breeding to feed over 7 billion people. For most cereal crops, yield relates to grain production, which could be enhanced by increasing grain number and weight. Grain number is typically determined during inflorescence development. Many mutants and genes for inflorescence development have already been characterized in cereal crops. Therefore, optimization of such genes could fine-tune yield-related traits, such as grain number. With the rapidly advancing genome-editing technologies and understanding of yield-related traits, knowledge-driven breeding by design is becoming a reality. This review introduces knowledge about inflorescence yield-related traits in cereal crops, focusing on rice, maize, and wheat. Next, emerging genome-editing technologies and recent studies that apply this technology to engineer crop yield improvement by targeting inflorescence development are reviewed. These approaches promise to usher in a new era of breeding practice.     

臭氧脱硝技术在稀贵多金属烟气治理中的应用

主要介绍在面临环境保护要求不断提升,废气排放指标不断降低的情况下,使用臭氧氧化+液碱脱硝技术对稀贵卡尔多炉和旋转顶吹炉生产回收金、银、硒、碲、铅、铋等金属产出的烟气的治理。治理后二氧化硫指标小于50mg/m3、氮氧化合物小于60mg/m3、尘指标小于10mg/m3,满足A类企业环保要求,同时其他重金属指标都满足国家国控指标要求,达到超低排放要求。     

贵冶一系统闪速炉给料系统改造运行实践

本文介绍了闪速炉给料系统的基本原理,并根据闪速炉给料系统出现的相关问题分析了产生的原因,通过对整个给料系统进行相应的技术改进,增加三段风动溜槽和烟灰失重系统,改造后闪速炉渣含铜由2.0%降到1.37%,SO3发生率由1.84%下降至0.82%,提升贵冶老系统闪速炉失重系统运行平稳性,提高了冰铜质量。     

基于FANUC数控系统实现刀具寿命管理

文章结合HARDINGE数控车床实例，介绍了如何利用FANUC18T数控系统中提供的计数器跟踪刀具加工的次数，通过新增一个刀具寿命管理功能模块的PMC子程序，为用户提供一个友好、可视、便捷的刀具寿命管理功能。对今后类似的设备功能设计和改进都具有实际的指导意义和参考价值。     

冷轧处理线卷取机带头定位精度的改进

针对采用带头与卷取机芯轴橡胶套筒定位区动态接触的传统自动定位技术控制效果不好而带来带头印缺陷的问题，对其产生原因进行了分析，这是因为不同规格、钢种带钢的工艺参数不同，带钢穿带过程中在传送辊上的打滑量不同，在传输通道上的下垂量不同，带头到达卷取机芯轴定位区时计算带头位置与实际带头位置存在不稳定的偏差，因此带头定位精度不稳定。为此，开发了双动态自动定位技术，穿带过程中预留了足够的带钢打滑及下垂富余量，且带头与定位区中心线在助卷皮带咬入口静止状态下接触，消除了影响带头定位精度的主要因素，带头定位精度能稳定在±15 mm的误差范围内。实际应用效果表明，该方法可行、实用。