α（β）-四苯氧基酞菁钴/TiO2复合材料的原位合成、表征和光谱性质

以钛酸正丁酯、3-硝基邻苯二腈和4-硝基邻苯二腈为原料、二价钴离子为模板剂,采用原位化学合成的方法合成了均匀掺杂的1,8,15,22-四苯氧基酞菁钴/TiO2和2,9,16,23-四苯氧基酞菁钴/TiO2复合材料。通过UV-Vis、XRD、TG进行了表征,并讨论了取代基的取代位置和TiO2对酞菁Q带最大吸收波长的影响,以及酞菁对TiO2晶型和TiO2对酞菁热稳定性的影响。     

双羟乙氨基-硝基型偶氮分子的三阶光学非线性

设计并合成了5种综合性能较好的双羟乙氨基给体-硝基受体型偶氮化合物,它们分别具有DπA型和DπAπD型共轭结构.用Z-扫描方法研究它们的三阶非线性光学性质.实验结果表明双羟乙氨基给体和硝基受体组合与偶氮共轭链相连组成的分子具有较大的三阶非线性极化率.其中化合物5具有DπAπD型共轭结构,它包含两条从N,N-双羟乙氨基给体到硝基受体的共轭链,因此较大的分子内电荷转移使三阶极化率γ达到2.958×10-33esu,并且在化合物的共轭链中引入具有较低离域能的芳香杂环能增大三阶极化率.     

2,9,16,23-四烷氧基酞菁钴(Ⅱ)的合成及光谱性质研究

用4-辛氧基邻苯二腈、4-十二烷氧基邻苯二腈争4-硝基邻苯二腈分别与氯化钴在熔融状态下合成了2,9,16,23-四-辛氧基钴酞菁和2,9,16,23-四-十二氧基钴酞菁以及无取代钴酞菁,对产物进行IR、UV-vis光谱测定和表征,并对比3种化舍物谱学性质,可以得出:对于长链碳原子来说,随着碳原子数的增加,烷氧基取代酞菁产生的红移程度逐渐变小.     

基于酞菁光控自组装的超分子三阶非线性光开关材料

酞菁的三阶非线性光学性能不仅取决于其分子结构，而且与酞菁分子在空间的排列密切相关。因此，控制酞菁化合物在空间的排列状态，就有望在超分子的层次控制酞菁的三阶非线性光学性能。我们设计了三类含有光致变色单元修饰的酞菁化合物。利用紫外光和可见交替照射下光致变色单元光异构过程中空间结构和电子结构的改变，实现了对酞菁自组装行为的有效光控。我们用Z-扫描的方法考察了光照前后这些酞菁光控自组装体系三阶非线性光学性能的改变。发现：这些材料不仅开关效应显著，且在“开”和“关”的状态下，都具有大的二阶分子超极化率（〉10^-30esu），在未来光电子和光子技术领域具有潜在的应用价值。     

TiO2薄膜上电沉积四氨基酞菁钴及其表征

为了寻找酞菁在TiO2上成膜新方式,我们用阳极氧化法在TiO2薄膜上成功制备了四氨基酞菁钴薄膜,对酞菁薄膜进行了SEM,XRD,UV-vis表征,并在成膜前后对四氨基酞菁钴分别进行了电化学性能表征.     

有机功能色素类化合物的合成与三阶非线性光学性能

设计并合成了苯并二呋喃酮、双偶氮-9,10-蒽二酮、苯并噻蒽以及偶氮-1,3,4-噻二唑4个系列的有机色素类化合物,并用UV,IR,1H NMR和元素分析表征了结构.采用飞秒激光,运用简并四波混频法,研究了化合物的三阶非线性光学性能.它们的三阶非线性光学极化率χ(3)为2.64～3.95×10-13esu,非线性折射n2为4.85～7.27×10-12esu,分子二阶超极化率γ为2.85～3.72×10-31esu.探索了化合物的分子结构对三阶非线性光学性能的影响.长的共轭链、吸供取代基和杂环的引入、取代基强的供电子或吸电子能力等因素有利于获得较大的三阶非线性光学性能.     

α(β)-四-苯氧基金属酞菁的合成、表征和光谱性质

以3-硝基邻苯二腈和4-硝基邻苯二腈为原料分别合成了1,8,15,22-四-苯氧基酞菁铜(镍)和2,9,16,23-四-苯氧基酞菁铜(镍),通过IR和UV-Vis光谱进行了表征,并讨论了取代基的取代位置和中心离子对酞菁Q带最大吸收波长的影响。     

3种偶氮化合物的合成及三阶非线性光学性能

合成了3种1,3,4-噻二唑偶氮化合物,其中1种为新化合物,用IR、1H NMR和元素分析表征了其结构.采用飞秒激光,运用简并四波混频法,研究了化合物在非共振状态下的三阶非线性光学性能.它们的三阶非线性光学极化率X(3)为(3.84～3.95)×10-13esu,非线性折射率n2为(7.07～7.27)×10-12esu,分子二阶超极化率γ为(3.56～3.72)×1031esu,响应时间τ为101fs.探索了化合物的分子结构对三阶非线性光学性能的影响.引入离域能小的芳杂环,形成吸供构型,增大取代基的吸或供电子能力等有利于获得较大的三阶非线性光学性能.     

π电子共轭键结构对材料非线性光学性能影响研究

合成了具有不同π电子共轭键3个新的有机光学材料4-(吡啶-4-乙烯),4'-(N,N-二羟乙基氨基)二乙烯苯(a),N-((4-(N,N-二羟乙基氨基)-苯亚甲基)-4-(吡啶-4-乙烯)苯胺(b)和4-(吡啶-4-乙烯),4'-(N,N-二羟乙基氨基)偶氮苯(c),使用脉宽8ns波长532nm调Q倍频ns/ps Nd:YAG脉冲激光系统测试了它们的非线性光学性能,研究了分子结构与非线性光学性能之间的关系.结果显示这些化合物具有大的三阶非线性光学系数,这可能来源于它们长的D-π-A共轭电子结构;以N=N双键为共轭键的化合物的非线性光学性能优于以C=N或G=C双键为共轭键的化合物.     

m,m′-二氨基二苯酮与均苯四酸二酐的微波辐射聚合

研究 m,m′-二氨基二苯酮 (m,m′- DABP)与均苯四酸二酐 (PMDA)的缩聚及亚酰化 ,并运用微波辐射和常规加热两种方式对反应进行了比较。考察了微波辐射时间 (功率 )、单体浓度、单体配比和温度等因素对缩聚物的特性粘数、转化率的影响。用红外光谱对亚酰化度进行了表征 ,并用简并四波混频技术首次测量了该缩聚物的三阶光学非线性极化率系数及其响应时间。实验结果表明 ,微波辐射对提高聚合物的特性粘数和转化率都有显著作用 ;合成的缩聚物具有较大的三阶光学非线性极化率系数 (聚酰亚胺的 χ(3) =1.642× 10 -13 esu)和较快的时间响应 (19ps     

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.     

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.……     

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.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to