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Synthesis, characterization and catalytic properties of mesoporous MCM-48 containing zeolite secondary building units

LI Qiang, ZHANG Ying, DOU Tao, LI Yuping, WANG Shan, SUN Famin

《化学科学与工程前沿（英文）》 2007年第1卷第1期页码 1-5 doi: 10.1007/s11705-007-0001-0

摘要： Mesoporous aluminosilicate MCM-48 containing zeolite secondary building units in the pore wall has been synthesized in alkaline media with a two-step procedure. The aluminosilicate precursors comprising zeolite secondary building units were first synthesized by carefully controlling reaction conditions and then were assembled using cotemplates of gemini surfactant [CHN(CH)(CH)N(CH)CH] (18-3-18) and triethanolamine (TEA). X-ray Diffraction (XRD) patterns of the as-made samples indicated that highly ordered mesostructured MCM-48 was formed. Transmission Electron Microscopy (TEM) images further verified the formation of MCM-48 with uniform cubic pore channel system having the pore opening diameter of about 25 Å. Compared with the conventionally synthesized MCM-48, the as-synthesized MCM-48 sample showed an adsorption band at 520 600 cm in its FT-IR spectrum, which was assigned to five-membered ring vibration from zeolite structure. This suggested the presence of zeolite building units in the pore wall. N2 adsorption data showed that the material had a much higher specific surface area (1 200 m/g) than the conventional MCM-48(1 100 m/g). Finally, the catalytic performance of the as-made MCM-48 was evaluated by hydrogenation dealkylation reaction of heavy aromatic hydrocarbons. Catalytic results showed that the as-made MCM-48 catalyst exhibited higher conversion than the conventional MCM-48 catalyst. The as-made mesostructured MCM-48 may have a potential catalytic application in the conversion of bulky molecules.

关键词： diameter mesostructured MCM-48 Catalytic presence five-membered

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中医五脏相关学说研究——从五行到五脏相关

邓铁涛,郑洪

《中国工程科学》 2008年第10卷第2期页码 7-13

摘要：

五行学说对中医学有深刻的影响，体现了传统医学重视联系、整体的特点，但五行学说本身有局限性，不能全面地反映事物间的普遍联系。中医以五脏配属五行，吸收了五行学说的精华；又根据脏腑学说的理论，在实践中超越了五行的限制。因此，中医的理论可名为“五脏相关学说”。在中医理论现代化中，可以将五脏之间的影响归纳为促进、抑制和协同3种关系，从多种角度来阐明中医的整体性与联系观。

关键词：中医脏腑学说五行

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Kinematic error separation on five-axis NC machine tool based on telescoping double ball bar

Min WANG, Jianzhong HU, Tao ZAN

《机械工程前沿（英文）》 2010年第5卷第4期页码 431-437 doi: 10.1007/s11465-010-0110-1

摘要： The theory and algorithm of the homogeneous transformation matrix (HTM) method are applied in establishing the kinematic error model of five-axis machining tool with two-axis turntable. Based on this model, a new method for the kinematic error separation in five-axis numerical control (NC) machining tool is proposed. In this study, three types of simultaneous three-axis control motions are designed for each rotary axis to identify the deviations. In the measurement, two translational axes and one rotary axis are simultaneously controlled to keep a constant distance between the tool and the worktable. Telescoping double ball bar is used to measure the relative distance between the spindle and the worktable in the motion of NC machining tool. Finally, the value measured by telescoping double ball bar is substituted into the model to obtain kinematic error of NC machining tool. Comparison has confirmed that the proposed method is high precision and can be applied to effectively and conveniently measure the five-axis machining tool.

关键词： error modeling error separation telescoping double ball bar five-axis numerical control (NC) machining tool

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Determination of the feasible setup parameters of a workpiece to maximize the utilization of a five-axis

Aqeel AHMED, Muhammad WASIF, Anis FATIMA, Liming WANG, Syed Amir IQBAL

《机械工程前沿（英文）》 2021年第16卷第2期页码 298-314 doi: 10.1007/s11465-020-0621-3

摘要： The machining industry must maximize the machine tool utilization for its efficient and effective usage. Determining a feasible workpiece location is one of the significant tasks performed in an iterative way via machining simulations. The maximum utilization of five-axis machine tools depends upon the cutting system’s geometry, the configuration of the machine tool, and the workpiece’s location. In this research, a mathematical model has been developed to determine the workpiece’s feasible location in the five-axis machine tool for avoiding the number of iterations, which are usually performed to eliminate the global collision and axis limit errors. In this research, a generic arrangement of the five-axis machine tool has been selected. The mathematical model of post-processor has been developed by using kinematic modeling methods. The machine tool envelopes have been determined using the post-processor and axial limit. The tooltip reachable workspace is determined by incorporating the post-processor, optimal cutting system length, and machining envelope, thereby further developing an algorithm to determine the feasible workpiece setup parameters accurately. The algorithm’s application has been demonstrated using an example. Finally, the algorithm is validated for feasible workpiece setup parameters in a virtual environment. This research is highly applicable in the industry to eliminate the number of iterations performed for the suitable workpiece setup parameters.

关键词： workpiece setup parameter five-axis space utilization setup parameters machine tool

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IN VITRO ACTIVITY OF EXTRACTS OF FIVE MEDICINAL PLANT SPECIES ON PLANT PATHOGENIC FUNGI

《农业科学与工程前沿（英文）》 2021年第8卷第4期页码 635-644 doi: 10.15302/J-FASE -2020343

摘要：

The antifungal effectiveness of extracts of five medicinal plant species was determined. The inhibitory activity of extracts of Eucalyptus tereticornis, Xanthium sibiricum, Artemisia argyi, Tupistra chinensis and Pyrola calliantha were evaluated against the mycelial growth of the plant pathogenic fungi Aspergillus niger, Botrytis cinerea, Penicillium digitatum, P. expansum, P. italicumand Rhizopus stolonifer. All plant extracts were prepared at 60°C using solvents (either water, 50% ethanol (v/v), 95% ethanol (v/v), ethyl acetate or petroleum ether). Fungicidal effects of all plants tested were confirmed. Different extracts from the same plant species gave different degrees of inhibition. All aqueous extracts had weak or no activity on all fungi tested. Ethyl acetate and 95% ethanol extracts from T. chinensis rhizomes gave greater inhibition and a broader spectrum inhibition than the other extracts. T. chinensis may have potential as a new natural fungicide and may be used for the preservation of agricultural and forestry products such as fruits and vegetables.

关键词： Botrytis cinerea / food preservation / plant diseases / plant pathogenic fungi / Tupistra chinensis

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Quality and efficiency improvement technology for five megawatt offshore wind turbines and its application

Huali HAN

《工程管理前沿（英文）》 2020年第7卷第4期页码 618-621 doi: 10.1007/s42524-020-0142-0

关键词： renewable energy megawatt offshore wind turbine technology-driven quality improvement

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Five-axis rough machining for impellers

Ruolong QI, Weijun LIU, Hongyou BIAN, Lun LI

《机械工程前沿（英文）》 2009年第4卷第1期页码 71-76 doi: 10.1007/s11465-009-0010-4

摘要： The most important components used in aerospace, ships, and automobiles are designed with free form surfaces. An impeller is one of the most important components that is difficult to machine because of its twisted blades. Rough machining is recognized as the most crucial procedure influencing machining efficiency and is critical for the finishing process. An integrated rough machining course with detailed algorithms is presented in this paper. An algorithm for determining the minimum distance between two surfaces is applied to estimate the tool size. The space between two blades that will be cleared from the roughcast is divided to generate CC points. The tool axis vector is confirmed based on flank milling using a simple method that could eliminate global interference between the tool and the blades. The result proves that the machining methodology presented in this paper is useful and successful.

关键词： five-axis impeller tool-path planning flank milling ruled surface

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Paratesticular fibrous pseudotumor: a report of five cases and literature review

null

《医学前沿（英文）》 2014年第8卷第4期页码 484-488 doi: 10.1007/s11684-014-0325-3

摘要：

Paratesticular fibrous pseudotumor is a rare benign tumor that originates from intrascrotal tissue, such as tunica vaginalis, epididymis, or spermatic cord. Five cases of fibrous pseudotumor in our hospital were reviewed retrospectively, and the clinical manifestations were analyzed. Three cases of unilateral nodules, comprising one case located in the tunica vaginalis and two cases located in the epididymis, underwent local excision of the unilateral nodule. Two cases of diffuse incrassation in the tunica vaginalis underwent right radical orchiectomy. Postoperative pathological examination showed that all were fibrous pseudotumors. An average follow-up of 26 months showed uneventful results without recurrence for all patients. Fibrous pseudotumor is not a neoplasm but a reactive fibrous inflammatory hyperplasia. Definitive diagnosis requires pathological examination. Radical orchiectomy should be avoided when possible, and local excision should be performed because of the lack of obvious evidence of potential malignancy.

关键词： fibroma inflammation scrotum testicular neoplasm

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Dynamic mechanism for the decline of China’s energy intensity during the 11th FYP (Five-Year Plan)

Minghui LI

《能源前沿（英文）》 2011年第5卷第3期页码 237-249 doi: 10.1007/s11708-010-0130-x

摘要： From 2006 to 2009, the aggregate energy intensity of China fell by 14.38%, which means that China has made substantial progress towards its goal of achieving approximately a 20% reduction in energy intensity during the period of the 11th FYP (Five-Year Plan). This paper describes some new properties of the mechanism for the decrease in China’s energy intensity since the beginning of the 11th FYP. First, compared with the period of the 10th FYP, technical, structural, and residential energy-savings have been improved to a certain extent. Secondly, unlike the dynamic mechanism before 2000, technical energy savings have been the main driver of momentum since the beginning of the 11th FYP. Next, although structural energy savings are not the main factor, they are still a key factor for the decrease in energy intensity. Finally, residential energy savings are still a stable driver of momentum for the decline in China’s energy intensity.

关键词： energy intensity structural energy savings technical energy savings

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A genome-wide association study of five meat quality traits in Yorkshire pigs

Qian DONG,Huiying LIU,Xinyun LI,Wei WEI,Shuhong ZHAO,Jianhua CAO

《农业科学与工程前沿（英文）》 2014年第1卷第2期页码 137-143 doi: 10.15302/J-FASE-2014014

摘要： Meat quality is an important trait in the pig industry. To identify genomic regions and haplotype blocks responsible for meat quality traits in pigs, a genome-wide association study was conducted for five traits including intramuscular fat content, pH at 45 min and 24 h, drip loss within 24 h and water-holding capacity in 231 Yorkshire barrows using illumina porcine 60k SNP chips. The results showed that a total of 344 single nucleotide polymorphisms (SNP) were significantly associated with five meat quality traits ( <1×10 ). Moreover, 323 SNPs were within the reported QTL regions, of which 21 were novel. Also, 158 SNPs fell into the proximal region of meat quality related genes. In addition, 25 haplotype blocks based on 116 SNPs were revealed with SNP combination patterns for five traits. Our study added new SNP information for identification of meat quality traits in pigs and will help elucidate the mechanisms of meat quality in pigs.

关键词： Pig GWAS meat quality trait SNP

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养殖业“十三五”发展趋势与政策建议

“养殖业十三五规划战略研究”项目组

《中国工程科学》 2016年第18卷第1期页码 17-21 doi: 10.15302/J-SSCAE-2016.01.003

摘要：

“十三五”期间乃至未来一段时间内，我国养殖产品需求仍呈刚性增长，但是养殖业面临资源短缺日趋严重、环境制约日益加剧等不利局面，同时面临国际竞争对国内产业冲击加剧等新的形势，未来我国养殖业必须走可持续发展道路。本文基于对我国养殖业的发展现状、可持续发展所面临的挑战，形成对我国养殖业可持续发展形势的基本判断，针对“十三五”，凝练了养殖业可持续发展的战略目标、基本原则和战略重点，并提出了“进一步明确养殖业在现代农业中的战略主导地位”“合理利用国际市场保障我国食物安全”“加快启动和实施一批养殖科技重点研发计划”等重大建议，为我国养殖业加快发展方式转变、实现现代化提供理论支撑。

关键词：养殖业可持续发展十三五趋势分析食物安全

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基于五品联动理论的品位效益优化决策研究

邵安林

《中国工程科学》 2014年第16卷第2期页码 68-72

摘要：

本文以五品联动理论为研究背景，考虑到矿山工程中地质工程、采矿工程、配矿工程、选矿工程和冶炼工程5 个工程是相互联系的串联耦合工程，是矿山企业活动的主体，而与其相对应的地质品位、采出品位、入选品位、精矿品位和入炉品位对于矿山整体经济效益起到关键的控制作用。本文运用并拓展了“质量守恒”原理，利用“矿量守恒”和“金属量守恒”建立了品位经济效益模型，提出了五品联动品位—效益活跃指数，通过实例计算与分析，获得了某铁矿的品位优化数值，为进一步研究矿山企业工程管理模式奠定了基础。

关键词：五品联动品位—效益活跃指数优化决策矿冶工程

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ACTIVITY OF EXTRACTS OF FIVE MEDICINAL PLANT SPECIES ON PLANT PATHOGENIC FUNGI

Shufeng YAO, Jiali XU, Haibo ZHANG, Hong GAO, Shibin SHANG, Dan WANG

《农业科学与工程前沿（英文）》 2021年第8卷第4期页码 635-644 doi: 10.15302/J-FASE-2020343

摘要： The antifungal effectiveness of extracts of five medicinal plant species was determined. The inhibitory activity of extracts of , , , and were evaluated against the mycelial growth of the plant pathogenic fungi , , and . All plant extracts were prepared at 60°C using solvents (either water, 50% ethanol ( ), 95% ethanol ( ), ethyl acetate or petroleum ether). Fungicidal effects of all plants tested were confirmed. Different extracts from the same plant species gave different degrees of inhibition. All aqueous extracts had weak or no activity on all fungi tested. Ethyl acetate and 95% ethanol extracts from rhizomes gave greater inhibition and a broader spectrum inhibition than the other extracts. may have potential as a new natural fungicide and may be used for the preservation of agricultural and forestry products such as fruits and vegetables.

关键词： Botrytis cinerea food preservation plant diseases plant pathogenic fungi Tupistra chinensis

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Allelopathic inhibition on red tide microalgae by five macroalgal extracts

AN Zhen, WANG Zhenyu, LI Fengmin, TIAN Zhijia, HU Hongying

《环境科学与工程前沿（英文）》 2008年第2卷第3期页码 297-305 doi: 10.1007/s11783-008-0055-3

摘要： This study aims to identify effective antialgal allelochemicals from marine macroalgae that inhibit the growth of red tide microalgae. Practically, new algicidal agents were developed to control red tide. The growth inhibitory effects of 5 marine macroalgae , , , , and on were evaluated by adding crude seawater extracts of macroalgal dry tissue into the culture medium containing . The half-effective concentrations at 120 h (EC) of the seawater extracts were 0.6, 0.9, 1.0, 1.0, and 4.7 g/L for the five macroalgae above, respectively. , and showed strong allelopathic effect on the growth of . There have been no previous reports with regard to the allelopathic effects of the former two macroalgae so far. The possible allelochemicals of 21 compounds of the were detected using Gas chromatography-mass spectrometry (GC-MS) analysis. Unsaturated fatty acids, acrylic acid (CHO), and linolenic acid (CHO) were the most likely allelochemicals in .

关键词： containing linolenic inhibitory microalgae Practically

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LC-ELSD analysis for simultaneous determination of five components in the Xue-Fu-Zhu-Yu capsules

Ying GAO, Wenyuan GAO, Xuan DONG, Fengge LI, Xinying YANG,

《化学科学与工程前沿（英文）》 2010年第4卷第1期页码 96-101 doi: 10.1007/s11705-009-0309-z

摘要： A reliable and accurate liquid chromatography with evaporative light scattering detection (LC-ELSD) method was developed for simultaneous determination of five constituents in Xue-Fu-Zhu-Yu capsule, a widely used prescription of traditional Chinese medicine (TCM). The chromatographic separation was performed on a Symmetry C column (150mm×4.6mm, 5.0μm) using gradient elution of acetonitrile and water (containing 1.0% acetic acid). The flow rate was 0.6mL/min and the temperature of column was 30°C. A good linearity correlation was obtained over the investigated concentration ranges. Recoveries of the five components varied from 97.31% to 99.84% (RSD<4.0%). The validated method was successfully applied to the quality assessment of Xue-Fu-Zhu-Yu capsule.

关键词： chromatographic separation prescription Symmetry chromatography evaporative