Screwdown load deviation model of 5 m heavy plate mill based on influence of back-up roll axial force

Screwdown load deviation threatens rolling mill safety and product quality. The contact between a 5?m rolling mill screwdown device and the back-up roll (BUR) bearing chock was simplified to a fixed hinge constraint, and the constraint of the keeper plates on the BUR bearing chock was simplified to a sliding hinge constraint. According to the BUR space force and moment equilibrium, a screwdown load deviation model affected by the BUR axial force was used to simulate the effect of the roll crossing degree on the screwdown load deviation. Screwdown load deviations were calculated for three rolling passes. The results are more consistent with the data than outputs calculated by a model that neglects axial force. Assumptions about the relationship between the load deviation and the work roll axial forces agree with the data. The results show that the BUR axial force causes a dynamic deviation of the screwdown load.     

Application of Baosteel’s non-grain oriented silicon steel in new energy electric vehicle motors

This paper presented a comparison of the designing and power loss for electric vehicle motors using various high-efficiency silicon steel sheets.Two types of cost-effective permanent magnet synchronous machines (PMSMs) using neodymium iron boron and new thin-gauge silicon steel sheets were developed.The frequency is a crucial factor impacting the characteristics of silicon steel sheets.The efficiency,torque-speed curve and other experimental results of PMSM motors were described and analyzed.     

Theoretical basis of the empirical coefficient in Grüneisen's formula for the calculation of the characteristic temperature

Summary A theoretical basis is given for the numerical coefficient in Grüneisen's formula and its dependence on the density of atomic packing is shown.     

Yingtan’s Copper Output Grew by 20% in the First 5 months of the Year

Since the beginning of this year,Yingtan City witnessed one after another climax in the development of copper industry,a large number of copper industry projects landed in Yingtanand started construction or production.From January till May,copper enterprises above designated size in the whole city are expected to fulfill 8.5 billion yuan in industrial added value,up by 16%;     

The Role of Precipitates in the Behavior of Young’s Modulus in Aluminum Alloys

The behavior of Young’s modulus, E, was determined in aluminum alloys such as AA7075 and AA2024 at room temperature under various thermomechanical treatments. E was almost 2 pct (AA7075) and 3 pct (AA2024) lower for these materials after solution heat treatment and quenching than after annealing. When the aging time was increased, values of E tended to approach the annealing values. The variation observed was attributed to structural changes during the thermal treatments. However, when the alloys were cold deformed before or after aging, no appreciable changes in E were observed. This behavior is quite different to that observed in cold-worked pure aluminum (and also in pure iron), in which E decreased to a minimum (7 to 10 pct reduction in values) and then partially recovered with additional cold working. The variation in behavior with cold working observed in a pure material and other materials that contain a second phase with nanometric precipitates was correlated with the density of dislocations and the length of the dislocation segments generated during the cold working process.     

Influence of the pressure in the vacuum unit’s working chamber on the content of hydrogen and nonmetallic inclusions in steel

In electrosmelting shop 2 at Belarussian Metallurgical Plant, the removal of hydrogen from steel is studied as a function of the residual pressure in the working chamber of the RH vacuum unit. The influence of the pressure on the quantity and composition of the nonmetallic inclusions in cord steel is also investigated.     

A new approach to the optimisation of zinc electrolyte cold purification process by Taguchi’s method

The neutralised zinc sulfate solution obtained from hydrometallurgical process of Angouran zinc concentrate has cadmium, nickel and cobalt impurities that must be purified before electrowinning. Therefore, cadmium and nickel are usually cemented out by addition of zinc dust under cold purification conditions. The present research aims to introduce a new technique for determination of effective parameters and optimisation of zinc electrolyte cold purification process using statistical design of experiments. The Taguchi’s method, based on orthogonal array design (OAD), was used to arrange the experiments. The experimental conditions addressed in the study were: the temperature range of 45–65°C for reaction temperature (T), one to five series for zinc dust particle size distributions (S), 15–75 min for reaction time (t), 1–2?5 g L^?1 for zinc powder concentration (M), and 200–600 rev min^?1 (R) for stirring speed. Optimum conditions for cold purification obtained in this study were T₄ (60°C), S₁ (series 1), t₃ (45 min), M₅ (2?5 g L^?1), and R₁ (200 rev min^?1).

La solution neutralisée de sulfate de zinc, obtenue à partir du procédé d’hydrométallurgie du concentré de zinc provenant d’Angouran, contient des impuretés de cadmium, de nickel et de cobalt que l’on doit purifier avant l’extraction électrolytique. Habituellement, on extrait le cadmium et le nickel par cémentation par addition de poudre de zinc sous des conditions de purification à froid. La recherche actuelle a pour but d’introduire une nouvelle technique pour la détermination des paramètres efficaces et pour l’optimisation du procédé de purification à froid de l’électrolyte de zinc en utilisant un plan d’expérience statistique. On a utilisé la méthode de Taguchi, basée sur un concept d’arrangement orthogonal (OAD), pour planifier les expériences. Les conditions expérimentales examinées dans l’étude incluaient la gamme de température de 45 à 65°C pour la température de réaction (T), une série d’une à cinq distributions de taille de particule de la poudre de zinc (S), de 15 à 75 min pour le temps de réaction (t), de 1 à 2?5 g L^?1 pour la concentration de la poudre de zinc (M) et de 200 à 600 rpm (R) pour la vitesse d’agitation. Les conditions optimales obtenues dans cette étude pour la purification à froid étaient de T₄ (60°C), S₁ (série 1), t₃ (45 min), M₅ (2?5 g L^?1) et R₁ (200 rpm).     

The Analysis on the Export Trend of China’s Aluminum Profiles in the Near Future

Since September 2006,in order to Control the export of products high in energy consumption, causing high pollution and with high intensity of resources and encourage the import of raw materials,the import and export policies on     

Analysis of China’s Aluminum Usage in the Transport Industry in 2009—Part Ⅱ

<正>Ⅱ. Aluminum Use in Railway Transport Railway transport vehicles include railway rolling stock and urban light rail transport vehicles. In recent years, with the rapid development of domestic transport industry, aluminum usage in railway transport vehicles has made significant breakthrough.     

Use of Flory’s approach for assessing the phase diagram of zinc-bismuth (Zn-Bi) system

In an attempt to check the suitability of Flory’s approach for assessing the miscibility gap in binary monotectic systems, Zn-Bi has been chosen. Using Flory’s approach for the liquid phase and experimental data for the existing solid phases, the computer generated phase diagram locates the monotectic point at 689.5 K (416.5 °C) and 0.6 at. % Bi. The critical point is located at 877.4 K (604.4 °C) and 13.96 at. % Bi.     

The contribution of children’s self-regulation and classroom quality to children’s adaptive behaviors in the kindergarten classroom.

In this study, the authors examined the extent to which children’s self-regulation upon kindergarten entrance and classroom quality in kindergarten contributed to children’s adaptive classroom behavior. Children’s self-regulation was assessed using a direct assessment upon entrance into kindergarten. Classroom quality was measured on the basis of multiple classroom observations during the kindergarten year. Children’s adaptive classroom behavior in kindergarten was assessed through teacher report and classroom observations: Teachers rated children’s cognitive and behavioral self-control and work habits during the spring of the kindergarten year; observers rated children’s engagement and measured off-task behavior at 2-month intervals from November to May. Hierarchical linear models revealed that children’s self-regulation upon school entry in a direct assessment related to teachers’ report of behavioral self-control, cognitive self-control, and work habits in the spring of the kindergarten year. Classroom quality, particularly teachers’ effective classroom management, was linked to children’s greater behavioral and cognitive self-control, children’s higher behavioral engagement, and less time spent off-task in the classroom. Classroom quality did not moderate the relation between children’s self-regulation upon school entry and children’s adaptive classroom behaviors in kindergarten. The discussion considers the implications of classroom management for supporting children’s early development of behavioral skills that are important in school settings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

1Analysis of China’s Aluminum Usage in the Transport Industry in 2009—Part I

<正>I. Aluminum usage in automobile and motorbike industry Since 2001 China's automobile production maintained a trend of sharp growth, in 2005 the total output of various domestic automobiles reached 5.705 million,     

Countertransference in child psychoanalytic psychotherapy: The emergence of the analyst’s childhood.

The author focuses on a particular type of countertransference with children—the emergence of the therapist’s childhood memories and experiences in child psychotherapy. The revival of these childhood recollections in the analyst is not a barrier or sign of pathology as previously held, but rather in some cases a vital resource that may potentially deepen and facilitate analytic work. The therapist’s memory and attendant fantasies, physical/sensory experience, and affect states in the context of the childhood memory may afford the analyst the opportunity to not only make contact with his or her “self” as a child, but also to further symbolize these states of mind and use them in the exploration of the child patient’s mind. Through intersubjective exchanges with the patient, the analyst’s childhood memories are given new meaning in the context of the therapeutic work with the child patient. The author highlights the uniqueness of countertransference with children as compared with adults. A detailed clinical vignette is presented, organized around the arrival of a memory from the analyst’s childhood and how the analyst made use of it in the transference/countertransference field. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Antaike Lowered the Forecast on the Growth of China’s Raw Copper Smelting and Refining Capacity for 2013

Antaike lowered the forecast on the growth of China’s raw copper smelting and refining capacity in 2013, the quantities being reduced are respectively 600,000 t/a, according to some sources China’s copper production will be reduced.According to one analyst of this organization,     

Factor structure of the Children’s Perception of Interparental Conflict Scale for studies of youths with externalizing behavior problems.

The assessment of children’s perception of marital conflict is an important area of research related to family relations, children’s cognitions about self, and the development of psychopathology. The leading instrument in this domain is the Children’s Perception of Interparental Conflict Scale (CPIC; J. H. Grych, M. Seid, & F. D. Fincham, 1992). It has 48 items organized into 9 conceptual designed subscales, with reports of 3-factor higher order structure to the 9 subscales. However, the 3-factor solution does not capture all 9 subscales well. Further, items have never been subjected to factor analysis to evaluate the best fitting factor structure at the item level. Doing so is particularly important when bringing the scale into new populations such as children with attention-deficit/hyperactivity disorder (ADHD) or disruptive behavior disorders. In the present study, 2 samples of children (total N = 1,190; ages 6–18 years) completed the CPIC. An exploratory factor analysis in Sample 1 (from a clinical study of ADHD and non-ADHD youths) yielded 4 interpretable factors. A confirmatory factor analysis in Sample 2 (a population sample of twins) confirmed the generalizability of the solution with an acceptable fit, although 1 item was dropped. The final solution used 38 of the 48 items. The 4-factor solution captured a Conflict Properties factor, two appraisal factors labeled Threat to Self and Self-Blame, and a Triangulation/Stability factor that included elements of appraisal and content. The authors concluded that the item-based 4-factor solution to the CPIC is preferable to the 9-factor or 3-factor formulation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Contractual Approach for Facilitating the Resolution of Dispute over a Contractor’s Failure to Comply with Time Limit for Notice of Delays

The enforcement of a contractor’s notice of delays and claims as “a condition precedent” to a contractor’s claims is a controversial issue among practitioners, researchers, and legal scholars. Strict enforcement or liberal interpretations (no enforcement) of time limit for a contractor’s notice have some implications for the success of projects and for the construction industry. This paper examines and compares the different views regarding enforceability of notice provisions. The paper evaluates those views and thereafter proposes an alternative contractual approach for dealing with a contractor’s noncompliance with the provision. The applicability of the proposed approach is evaluated vis-à-vis legal principles. The proposed approach appears to be practical and equitable. It could facilitate early resolution of disputes relating to notice. It could also make the outcome of notice-related dispute more predictable. Considering the contractual, legal, and practical problems that could arise from a strict enforcement and a liberal interpretation (no enforcement) of time limit for a contractor’s notice, the paper highlights the benefits of the proposed approach to the employers (project owners), contractors, and the construction industry at large.