植物基因工程研究进展

植物基因工程研究进展贾士荣植物基因工程是生物技术中一项快速发展的新技术，运用这种技术可定向创造出高产、优质、抗逆的植物新品种，大幅度提高作物产量，因而对未来农业的发展将起重要的作用。植物基因工程以重组ＤＮＡ技术、细胞和组织培养为基础，克服常规育种中有...     

信宜市超级稻高产栽培技术的探讨

1引言： 超级稻,即稻穗较大、产量较高的水稻品种,其特点为穗大粒多,生育期较长,大部分品种有二次灌浆现象,生产潜力在10．5t／hm2以上。根据中央一号文件精神,加快推进农业科技创新,实施粮食丰产科技工程,信宜市大力推广超级稻高产栽培技术。     

水稻两用核不育系选育技术流程及应用研究

以农垦５９Ｓ、安农Ｓ－１、衡农Ｓ－１、５４６０Ｓ、赣ⅠＳ、赣ⅡＳ及赣ⅢＳ及其衍生不育系为核不育基因供体，分别与籼、粳稻品种杂交转育，经分离选择、花药培养以及结合长日低（高）温、短日低（高）温的“加压”筛选鉴定，提出了一条以基因供体为基础，以生物技术为手段，以加压筛选为条件的快速、简便、准确、有效的选育技术流程。按此流程，只需三年五个世代即可有效地育成实用型的两用核不育水稻。已经育成１２８６Ｓ、Ｈ１３５６Ｓ、Ｈ２０４８Ｓ、６４４２Ｓ等一批早、中、迟熟期配套的长日高温不育、育性稳定的籼型核不育系。同时，筛选出终生不育、高温不育低温可育、高温可育低温不育、长日不育短日可育及长日可育短日不育的各类籼型核不育系（材料），为选育适应不同生态条件下的籼型两用核不育系提供了行之有效的快速的技术方法和途径。     

大连“智慧海洋”示范工程启动

大连"智慧海洋"示范工程充分利用了沿海的便利条件，将现代化智能技术、信息处理技术与海洋装备、海洋活动相结合，以完善的海洋信息采集与传输体系为基础，运用工业大数据和互联网大数据技术，实现海洋资源共享、海洋活动协同，挖掘新需求，创造新价值。     

计算机教学趣味论探索

本文从计算机课程教学利用趣味式教学模式出发，探讨趣味和实际相结合的方法，提出教师创造趣味性强，可操作，具有弹性空间的场景来引导学生的可行性。     

福建省红色革命基地景观设施智能设计的实践探索——以八·一七革命纪念馆为例

红色文化是中国共产党坚持马克思主义路线,在革命、抗战和新中国建设与发展过程中所创造出来的宝贵精神财富。当前,人工智能、大数据和云计算等信息技术,深刻影响我国产业发展和人民生活,也为我国红色革命基地的景观设计和文化弘扬提供了技术支持。结合人工智能信息技术,对福建省红色革命基地的景观设施进行智能化设计改造,以期紧抓智能技术赋能契机,充分发挥智能技术在优化游客体验和弘扬红色文化方面的促进作用,也为我国该领域的理论研究提供实践案例。     

注塑成型工艺参数自动设置与优化技术

工艺参数是注塑制品质量的决定性因素之一,其设置与优化一直强烈依赖于工艺人员的经验与水平。工艺参数的自动设置与优化方法研究具有重要的意义,但需要克服工艺参数数量多,与制品、模具、材料耦合强,难以精确建模的难题。近年来,越来越多的研究,尝试采用计算机仿真技术在模拟计算方面的优势,以及智能技术在处理强经验、弱理论领域的优势,来解决该难题。按所采用技术方法的不同,可以分为基于仿真计算的优化、专家系统或实例推理以及实验设计与优化。对上述3类注塑工艺参数的自动设置与优化技术的研究现状进行了综述,介绍了3类注塑成型工艺的特点和局限性,并对今后的研究方向给出了建议。     

基于确定性测量矩阵的心电信号压缩采样算法研究

远程心电监测治疗中心电压缩技术至关重要.论文介绍了压缩采样理论的原理,根据确定性矩阵在压缩采样理论硬件实现上的优势,构造了一种多项式确定性矩阵,与块稀疏贝叶斯框架算法相结合,并在此基础上,对多项式确定性矩阵QR分解进行优化,实验表明:该矩阵可以满足实时高精度重建信号的要求,优化后的矩阵更进一步提高了算法性能.     

对小麦杂种优势研究方法的探讨

目前小麦品种间的遗传相似系数达0.8以上,造成杂种优势幅度降低,缺乏强优势组合,因此,迫切需要拓宽小麦遗传基础和扩大基因多样性。利用杂种优势是提高小麦单产的重要途径之一。本文分析了小麦杂种优势利用方法。     

工业控制自动化技术的现状与发展趋势

工业控制自动化技术是一种运用控制理论、仪器仪表、计算机和其它信息技术,对工业生产过程实现检测、控制、优化、调度、管理和决策,达到增加产量、优化质量、降低能耗、确保安全等目的的综合性技术,主要是由工业自动化软件、硬件和系统三大部分组成。工业控制自动化技术作为20世纪现代制造领域中最主要的技术之一,重点解决生产效率与一致性问题。虽然自动化系统本身并不直接创造效益,但它对企业生产过程有明显的提升作用。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...