Process and performance of DAAF microspheres prepared by continuous integration from synthesis to spherical coating based on microfluidic system

In order to improve the energy output consistency of 3, 3’-diamino-4, 4’-azoxyfurazan(DAAF) in the new insensitive booster and the safety and efficiency in the preparation process, a continuous preparation system of DAAF from synthesis to spherical coating was designed and established in this paper, which combined ultrasonic micromixing reaction with microdroplet globular template. In the rapid micromixing stage, the microfluidic mixing technology with ultrasonic was used to synergistically strengthen the uniform and rapid mass transfer mixing reaction between raw materials to ensure the uniformity of DAAF particle nucleation-growth, and to prepare high-quality DAAF crystals with uniform structure and morphology and concentrated particle size distribution. In the microdroplet globular template stage, the microfluidic droplet technology was used to form a droplet globular template with uniform size under the shear action of the continuous phase of the dispersed phase solution containing DAAF particles and binder. The size of the droplet template was controlled by adjusting the flow rate ratio between the continuous phase and the dispersed phase. In the droplet globular template, with the diffusion of the solvent in the dispersed phase droplets, the binder precipitates to coat the DAAF into a ball, forming a DAAF microsphere with high sphericity, narrow particle size distribution and good monodispersity. The problem of discontinuity and DAAF particle suspension in the process was solved, and the coating theory under this process was studied. DAAF was coated with different binder formulations of fluororubber(F2604), nitrocellulose(NC) and NC/glycidyl azide polymer(GAP), and the process verification and evaluation of the system were carried out. The balling effects of large, medium and small droplet templates under different binder formulations were studied. The scanning electron microscope(SEM) results show that the three droplet templates under the three binder formulations exhibit good balling effect and narrow particle size distribution. The DAAF microspheres were characterized by powder X-ray diffraction(XRD), differential scanning calorimetry(DSC), thermo-gravimetric(TG) and sensitivity analyzer. The results showed that the crystal structure of DAAF did not change during the process, and the prepared DAAF microspheres had lower decomposition temperature and lower mechanical sensitivity than raw DAAF. The results of detonation parameters show that the coating of DAAF by using the above three binder formulations will not greatly reduce the energy output of DAAF, and has comparable detonation performance to raw DAAF. This study proves an efficient and safe continuous system from synthesis to spherical coating modification of explosives, which provides a new way for the continuous, safe and efficient preparation of spherical explosives.

Synthesis methods and powder quality of titanium monocarbide

Titanium monocarbide(TiC),which is the most stable titanium-based carbide,has attracted considerable interest in the fields of energy,catalysis,and structural materials due to its excellent properties.Synthesis of high-quality TiC powders with low cost and high efficiency is crucial for industrial applications;however major challenges face its realization.Herein,the methods for synthesizing TiC powders based on a reaction system are reviewed.This analysis is focused on the underlying mechanisms by which synthesis methods affect the quality of powders.Notably,strategies for improving the synthesis of highquality powders are analyzed from the perspective of enhancing heat and mass transfer processes.Furthermore,the critical issues,challenges,and development trends of the synthesis technology and application of high-quality TiC powder are discussed.

Microfluidic-oriented synthesis of enriched iridium nanodots/carbon architecture for robust electrocatalytic nitrogen fixation

Electrocatalytic nitrogen reduction reaction(NRR)is considered as a promising candidate to achieve ammonia synthesis because of clean electric energy,moderate reaction condition,safe operating process and harmless by-products.However,the chemical inertness of nitrogen and poor activated capacity on catalyst surface usually produce low ammonia yield and faradic efficiency.Herein,the microfluidic technology is proposed to efficiently fabricate enriched iridium nanodots/carbon architecture.Owing to in-situ co-precipitation reaction and microfluidic manipulation,the iridium nanodots/carbon nanomaterials possess small average size,uniform dispersion,high conductivity and abundant active sites,producing good proton activation and rapid electrons transmission and moderate adsorption/desorption capacity.As a result,the as-prepared iridium nanodots/carbon nanomaterials realize large ammonia yield of 28.73 μg h^(-1) cm^(-2) and faradic efficiency of 9.14%in KOH solution.Moreover,the high ammonia yield of 11.21 μg h^(-1) cm^(-2) and faradic efficiency of 24.30%are also achieved in H_(2)SO_(4) solution.The microfluidic method provides a reference for large-scale fabrication of nano-sized catalyst materials,which may accelerate the progress of electrocatalytic NRR in industrialization field.

Titanium Aluminides: Science, Technology, Applications and Synthesis by Mechanical Alloying

The production. characteristics. and commercialization of monolithic and composite titanium aluminides are summanzed with emphasis on use in the demanding aerospace industry. The attractive elevated temperature properties combined with alow density make these materials of great interest, but inherently low 'forgiveness', and environmental concerns, must be overcome before widespread use will occur One synthesis method for the production of monolithic titanium aluminides-mechanical alloying- will be discussed in detail

APPLICATION OF HYDROTHERMAL TECHNOLOGY IN MATERIAL SYNTHESIS - A SELECTIVE REVIEW

This paper is a brief and selective review on hydrothermal synthesis of advanced materials. Some general comments about the hydrothermal synthesis of materials are presented. In particular, the surface modification and hydrothermal synthesis of functional powders (e.g. the hydrothermal coating of aluminum borate whiskers with chromium oxide, hydrothermal synthesis of Ni-Zn ferrite and magnesium hydroxide ) are introduced and their importance are explained.

Controlling the light wavefront through a scattering medium based on direct digital frequency synthesis technology

Phase modulation is a crucial step when the frequency-based wavefront optimization technique is exploited to measure the optical transmission matrix(TM) of a scattering medium. We report a simple but powerful method, direct digital frequency synthesis(DDS) technology to modulate the phase front of the laser and measure the TM. By judiciously modulating the phase front of a He–Ne laser beam, we experimentally generate a high quality focus at any targeted location through a 2 mm thick 120 grit ground glass diffuser, which is commercially used in laser display and laser holographic display for improving brightness uniformity and reducing speckle. The signal to noise ratio(SNR) of the clear round focus is 50 and the size is about 44 μm. Our study will open up new avenues for enhancing light energy delivery to the optical engine in laser TV to lower the power consumption, phase compensation to reduce the speckle noise, and controlling the lasing threshold in random lasers.

Graph Clustering Algorithm for RT Level ALU Technology Mapping

Register transfer level mapping (RTLM) algorithm for technology mapping at RT level is presented,which supports current design methodologies using high level design and design reuse.The mapping rules implement a source ALU using target ALU.The source ALUs and the target ALUs are all represented by the general ALUs and the mapping rules are applied in the algorithm.The mapping rules are described in a table fashion.The graph clustering algorithm is a branch and bound algorithm based on the graph formulation of the mapping algorithm.The mapping algorithm suits well mapping of regularly structured data path.Comparisons are made between the experimental results generated by 1 greedy algorithm and graphclustering algorithm,showing the feasibility of presented algorithm.

Application of Ceramic Coat Synthesized by In-Situ Combustion Synthesis to BF Tuyere

A novel technology of tuyere protection is introduced. The ceramic coat .is synthesized by using in-situ combustion process as the internal, external, and nose protecting coat of BF tuyeres. It can effectively protect the tuyeres and reduce heat loss by cooling water. The technglogy is quick-acting, easy to use, energy-saving and can make tuyeres have long service life. The feasibility of the application of the tuyere ceramic coat is discussed and the energy-saving effect of the tuyere is compared with that of the tuyeres lined with refractory.

Synthesis of Ultrafine Fe_3O_4 Powder via a Novel Ageing Process

Ultrafine Fe3O4 powder was successfully synthesized via a novel ageing process from a precursor FeO（OH）, which was the hydrolysate of FeCl3 in the urea solution. The structure of as-synthesized powder was characterized by X-ray diffraction （XRD）, and the morphology of these nanoparticles was investigated using a transmission electron microscope （TEM）. Pure phase Fe3O4 was obtained and the mean diameter of these nanoparticles was about 21 nm.Furthermore, the study indicated that the precursor FeO（OH） played an important role in the formation of Fe3O4 nanoparticles. The mechanism was also discussed.

Review of space information technology

The features of information technology （IT） are discussed first. On this basis, the features of space information technology （SIT） are presented and SIT is elaborated in five categories. The popularization of SIT is an informatization process and will promote the industrialization of national economy and the modernization of industry such as agriculture. The necessity of the synthetical application of SIT is studied emphatically, and the development trend of SIT is discussed.

A Protocol to Develop Phenolic Emulsifiers Used in Micro-surface by Control Technology

The phenolic emulsifiers used in emulsified asphalt of micro-surfacing, which was the most important tools in the road maintenance, were investigated by control technology. Many factors influencing this reaction were studied and three kinds of phenolic emulsifiers were prepared without catalyst in ethanol. The performance was researched that 2-（{2-[2-（2-Amino-ethylamino）-ethylamino]-ethyl-amino}-methyl）-4- nonyl-phenol （abbreviated as TETA） could be used in micro-surface. With addition of 0.5 % demulsifier, the mixing time was extended to 120 seconds obviously, and the cohesion torque （60 min） was 2.8 N＊m, which satisfied the opening traffic time shorter than 1 h. The wet track abrasion （6 d） was lower than 807 g/m2, with interracial modifier added, but the load wheel was increased with interfacial modifier increasing. When the TETA： demulsifier： interracial modifier =3：1：3, excellent performance was obtained and the experimental results met the International Slurry Surfacing Association （ISSA） standard. The synthesis process of this emulsifier is simple and the performance used in micro-surface was excellent, so this kind of emulsifier could have a better application future.

Overview of technology mapping

This Paper covers the main points of technology mapping technique, fundamentals of structural and Booleanmaching methas, effects of maiching solutions on technology mapper, methods of seeking the minimum cost cover fortechnology mapping, and trend of technology mapping development.

METHOD OF HIGH-LEVEL TECHNOLOGY MAPPING BASED ON KNOWLEDGE(RULE)

This paper studies the linkage problem between the result of high-level synthesis and back-end technology, presents a method of high-level technology mapping based on knowl edge, and studies deeply all of its important links such as knowledge representation, knowledge utility and knowledge acquisition. It includes: (1) present a kind of expanded production about knowledge of circuit structure; (2) present a VHDL-based method to acquire knowledge of tech nology mapping; (3) provide solution control strategy and algorithm of knowledge utility; (4)present a half-automatic maintenance method, which can find redundance and contradiction of knowledge base; (5) present a practical method to embed the algorithm into knowledge system to decrease complexity of knowledge base. A system has been developed and linked with three kinds of technologies, so verified the work of this paper.

Experimental Investigation on Finishing Technology by Magnetostrictive Ultrasonic Vibration of Magnetic Liquid

Magnetic liquid can produce alternative internal pressure under the alternative high-frequency gradient magnetic field.Because it has higher bulk modulus,the internal pressure results in its volume change.Using piezoelectric transducers,the ultrasonic wave generated by the vibration of magnetic liquids can be detected,which shows that the magnetic liquids have the magnetostrictive effect and can generate the ultrasonic vibration under the alternative magnetic gradient field.Some nonmagnetic abrasives and rust-proofing agents can be mixed into the magnetic liquids,under the alternative magnetic field,the abrasives held by magnetic liquids grind the surface of the workpieces,and thus,the finishing for the surface with complex shape,mold cavity and inner wall of tiny tubes can be realized.

The Application of Three-Dimensional Integrated Protection Technology in High Slope Control of Mountainous Highway

In the process of China's national economy construction,the role of highway traffic is unquestionable.And with the continuous development of society and the continuous improvement of highway grade,the work of the highway slope governance become a top priority,especially for some mountainous area highway,strengthen management of slope is very critical.The emergence of three-dimensional comprehensive protection technology has created great convenience for the management of the slope of the mountainous highway,and the safety of the mountain highway has been improved effectively.In view of this,the paper focuses on the application of three-dimensional integrated protection technology in the treatment of highway high slope in mountainous areas for reference and reference.

著作权视域下深度合成算法技术的法律规制

深度合成算法技术由于其趣味性与便捷性,满足了民众的多元化需求,集中应用于社交媒体、影视娱乐等领域。然而,深度合成算法技术激发用户创新内容的同时,在著作权领域也引发了一系列困境与挑战。通过梳理分析现行著作权法难以将深度合成物纳入“作品”的范畴、现行合理使用制度难以判定对原作品的“深度合成行为”以及现行著作权法难以协调深度合成“作品”与原作品的保护边界这三大亟待解决的困境,并提出相应的著作权法规制路径,从而实现著作权保护与深度合成算法技术应用的平衡发展。

聚合物合成工艺学课程思政教学探索

课程思政是高校教改的方向之一,即以立德树人为根本任务,将思政工作、价值引领贯穿于教学全过程。聚合物合成工艺学是工科高分子专业的基础核心课程。该文针对聚合物合成工艺学的课程内容,深度挖掘专业知识中蕴含的思政元素,将思政元素由点到面地融入各章节的专业知识讲授中,从而实现全员全程全方位育人,为高分子合成工业培养具有“家国情怀、国际视野、创新思维、工匠精神”的高素质应用型高级专门人才。

造纸科技英语词汇教学的英语构词法运用

近年来,造纸行业进入了由高速发展阶段转向高质量发展的新经济时代。造纸科技英语专业学习日趋重要。与英语必修课程有所不同,造纸科技英语词汇量大,生僻词多,记忆困难,大部分学生在学习过程中比较吃力,难以准确理解文章意思。针对这一问题,着重分析了英语构词法的相关概念,提出造纸科技英语构词的几种方式,并探究了构词法在造纸科技英语词汇教学中的应用策略,以期为造纸科技英语教学提供借鉴。

橡胶促进剂合成技术研究进展

介绍近年来我国橡胶促进剂合成技术的研究进展,指出橡胶促进剂生产企业今后应该继续改进或者完善现有生产工艺技术、装置,不断提高产品收率和纯度,降低生产成本,实现清洁生产和安全环保生产;加快精制提纯技术的开发,以降低能耗,进一步提升产品的应用价值;加强废水处理新技术的开发,减少对环境的污染,提高原料的回收利用率;不断开发新产品,以满足实际生产需求。

技术锁定生态系统评价研究——以5G产业为例

在吸收借鉴现有研究成果基础上,提出技术锁定生态系统概念,对其内涵与特征进行解析,构建技术锁定生态系统要素模型,从系统稳定性、系统中心性以及系统异质性3个方面,建立技术锁定生态系统评价指标体系,并采用增长率循环指数合成方法,结合5G产业有效发明授权专利,测度2012—2021年中美日韩德五国的技术锁定生态系统指数。结果发现,中国的技术锁定生态系统指数呈现出波动性增长态势;美国的技术锁定生态系统指数呈现出先升后降再缓慢上升的发展态势;日本的技术锁定生态系统指数前期平稳,后期波动较大;韩国与德国的技术锁定生态系统指数均呈现下降趋势。