CO2 gasification of wood charcoals derived from vacuum and atmospheric pyrolysis

The gasification of biomass derived char obtained via vacuum and atmospheric pyrolysis of Populus tremuloides has been studied in the ranges of 725–960°C and 0.1 to 6 MPa. CO₂ was used as the oxidizing gas. The results show that char reactivity is influenced by the preheating rates and that pressure effects are significant between 850°C and 950°C. A correlation based on the expression: df/dt = k₀{exp(-E/RT)}(1 - f)^af^βP^yCO₂ was used to fit the experimental data. In general, vacuum pyrolysis derived char showed a higher reactivity than atmospheric pyrolysis chars. An explanation based on a higher oxygen content of the vacuum pyrolysis char is suggested.     

Prediction of Acid Mine Drainage: Importance of Mineralogy and the Test Protocols for Static and Kinetic Tests

Static tests, which compare the acid-generating potential and acid-neutralizing potential for a given mine waste (tailings or waste rocks), are characterized by a wide uncertainty zone in which it is impossible to accurately predict the acid-generating potential (AGP). Then, to better assess long-term AGP, kinetic tests are usually performed to provide more information about the reaction rates of the acid-generating and acid-neutralizing minerals. The present work compares the classic Sobek static test with three mineralogical static tests to assess the importance of sample mineralogy in acid mine drainage (AMD) prediction. We also investigated how experimental procedures related to static tests can influence prediction results. We used three synthetic tailings samples made by mixing well-characterized pure minerals in calibrated proportions. Although basically different in their principles and procedures, the modified Sobek and mineralogical static tests gave similar results. These AGP predictions were then validated by the use of a kinetic test. The kinetic test protocol was also modified in this study and the results obtained correlated well with the static test results, in contrast to the standard kinetic test protocol. The present work highlights the limitations of static and kinetic test procedures, and provides recommendations for a better use of these tests for more reliable AMD prediction.     

Morphology of the inferior frontal gyrus in developmentally language-disordered adults

The inferior frontal gyrus has traditionally been considered an important cortical region for language and may be important for understanding developmental language disorders. The morphology of the inferior frontal gyrus, as it appeared on T1-weighted sagittal magnetic resonance imaging (MRI) scans, was evaluated using a classification system that distinguished between seven basic morphological variants of the gyral and sulcal patterns in this region. This classification scheme was applied to the MRI scans of 41 neurologically normal adult subjects. To examine the relation between sulcal morphology and subject status, these subjects were sorted first by family history for developmental language disorders and then resorted by expression of behavioral signs consistent with a diagnosis of this disorder as determined by standardized testing. Morphological types that included an extra sulcus in the inferior frontal gyrus were statistically associated with the behaviorally based classification of subjects, but not with a positive family history for developmental language disorders. Because gyral patterns are prenatally determined, this finding is consistent with the theory that altered prenatal development contributes to the expression of a developmental language disorder.     

A Typology for Multi-Technology, Multi-Service Broadband Network Synthesis

Current technological possibilities for implementing multi-service networks include both single technology ATM or IP networks and multi-technology networks such as SONET-based or flat networks. However, regardless of the technology employed, the synthesis problem – to optimally route traffic and divide the network's transmission resources between its virtual links – remains of prime importance.In this paper, we review, compare, and classify the extensive recent literature concerning multi-service network synthesis methods. In order to do this, we propose a typology based on switching and control strategies and a general notation that reflects the layered nature of the network. Technology independent mathematical models describe the various, essentially different, approaches presently found in the literature.     

A collaborative relationship between professional psychology and the Roman Catholic Church: A case example and suggested principles for success.

For many years the professional psychology and religious communities have maintained a strained relationship. At best, a passive indifference has been the norm. Fortunately, in some circles, the psychological and religious communities have recently begun to develop more collaborative relationships. For some psychologists, religion and spirituality is now in vogue. The purpose of this article is to detail one professional's experience in developing a close working relationship with both clergy and parishioners of the Roman Catholic Church and highlight useful principles for others interested in collaboration between psychology and religious communities. Hopefully, those who are interested in pursuing closer collaborative relationships with religious communities can benefit from the experiences and principles outlined here. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Training child clinical predoctoral interns and postdoctoral fellows in ethics and professional issues: An experiential model.

The purpose of this article is to outline an experiential professional issues and ethics seminar program developed for predoctoral psychology interns and postdoctoral fellows in the child psychology training program at Stanford University Medical School. It is imperative that trainees develop a comprehensive and practical understanding of both ethical principles and professional issues before completing their academic and clinical training in psychology. A review of this seminar program may help other internship and postdoctoral training programs develop or fine-tune their methods of educating trainees in both professional issues and ethics. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sur un nouveau materiau pour l'enregistrement magnetique derive du dioxyde de chrome

A new ferromagnetic ternary oxide of formula Cr_1?xIr_xO₂ (0 < x < 0.3) has been prepared and ajusted. Thanks to iron doping a high coercive field ($\text{H}{}_{\mathrm{<mtext>c</mtext>}}\text{? 600}\text{Oe}$) can be obtained in appropriate conditions for an irridium content as low as $\text{x}\text{? 5.10}{}^{\mathrm{?4}}$. Such a material is promising for magnetic recording.     

Potential-biased, asymmetric waveforms for charge-injection with activated iridium oxide (AIROF) neural stimulation electrodes

The use of potential biasing and biphasic, asymmetric current pulse waveforms to maximize the charge-injection capacity of activated iridium oxide (AIROF) microelectrodes used for neural stimulation is described. The waveforms retain overall zero net charge for the biphasic pulse, but employ an asymmetry in the current and pulse widths of each phase, with the second phase delivered at a lower current density for a longer period of time than the leading phase. This strategy minimizes polarization of the AIROF by the charge-balancing second phase and permits the use of a more positive anodic bias for cathodal-first pulsing or a more negative cathodic bias for anodal-first pulsing to maximize charge injection. Using 0.4-ms cathodal-first pulses, a maximum charge-injection capacity of 3.3 mC/cm2 was obtained with an 0.6-V bias (versus Ag/AgCl) and a pulse asymmetry of 1:8 in the cathodal and anodal pulse widths. For anodal-first pulsing, a maximum charge capacity of 9.6 mC/cm2 was obtained with an asymmetry of 1:3 at an 0.1-V bias. These measurements were made in vitro in carbonate-buffered saline using microelectrodes with a 2000 microm2 surface area.     

Ten strategies for psychology trainees and practicing psychologists interested in avoiding ethical and legal perils.

Litigation against psychologists has increased in recent years, resulting in high malpractice premiums, negative publicity, and defensive approaches to professional practice. While many practicing psychologists have become keenly aware of the need to be up-to-date on legal and ethical issues in professional practice, it is unclear if this attention has filtered down to the training of graduate students, interns, and postdoctoral trainees. While trainees are generally fairly well versed in the Ethics Code (APA, 1992) they tend to have little practical understanding of strategies to minimize both ethical and legal troubles. The purpose of this article is to outline 10 practical strategies to minimize the chances of ethical and legal problems for both psychology trainees and practicing psychologists. While this is not an exhaustive list, it highlights some of the major issues trainees and psychologists should be aware of and offers direction for minimizing potential problems. (PsycINFO Database Record (c) 2010 APA, all rights reserved)