四方金矿选矿工艺技术改造与生产实践

针对四方金矿选矿厂工艺流程中存在的问题进行了分析与研究,并在现有条件下对其进行技术改造。通过对碎磨系统和浸出系统的优化改造,金回收率提高了1．22％,处理矿量增加21t／d,并降低了选矿生产成本和尾渣、尾液的指标,取得了良好的经济效益。     

Emerging breakthroughs in psychotherapy integration: Three predictions and one fantasy.

Integration or eclecticism is the most common theoretical orientation among psychotherapists; however, its meaning is diffuse, its commitment typically philosophical rather than empirical, and its training idiosyncratic and unreliable. The author discusses 3 key breakthroughs he foresees over the next decade in psychotherapy integration. The 1st will be to arrive at a consensual understanding of what psychotherapy integration stands for and against. The 2nd breakthrough will be to conduct prospective outcome research that demonstrates the differential effectiveness of integrative therapies with diagnostically heterogeneous patients. The 3rd will be to establish training programs that insure competence in integrative approaches to psychotherapy or in differential referral. At that point, psychotherapy integration will constitute a conceptually coherent, empirically validated, and educationally sound position for practice. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sharing in nursing governance: creating opportunities for change

Shared governance has created a radical shift in the management and systems thinking of organisations by empowering employees through increased accountability, ownership and decision making. This paper outlines the process of introducing the concept of shared governance to the nursing division of a large not-for-profit private hospital in Victoria. The objectives for change and the philosophy of shared governance are explained so as to clarify the reasons for selection of the shared governance model. The steps involved in planning for the introduction of the change process, implementation and integration of the model at both organisational departmental levels, and the actual structure of the working model of shared governance are described.     

Making progress: does clinical research lead to breakthroughs in basic biomedical sciences?

Beta-catenin is a pivotal player in the signaling pathway initiated by Wnt proteins, mediators of several developmental processes. beta-catenin activity is controlled by a large number of binding partners that affect the stability and the localization of beta-catenin and is thereby able to participate in such varying processes as gene expression and cell adhesion. Activating mutations in beta-catenin and in components regulating its stability can contribute to the formation of certain tumors.     

Biotechnology core facilities: trends and update

A survey of 128 biotechnology core facilities has provided data on the finances, services, space requirements, and personnel. An average facility had four full-time personnel and 7.5 major instrument systems, and occupied 969 sq. ft. Average total income was $244,000/year, but annual user fee income was only $125,000. Typically, facilities required substantial institutional support or grants. Cost recovery (user fee income divided by total income) averaged 49%. During the last 5 years user fee income, total income, and cost recovery have increased. In-house charges for protein sequencing and peptide synthesis increased approximately 30%, while oligonucleotide synthesis charges decreased by 74%. The costs (charges corrected for subsidy from non-user fee income) for most services did not significantly change, except that oligonucleotide synthesis costs decreased by 25% in 1992. DNA synthesis had the highest throughout per month (116 samples), followed by amino acid analysis (86 samples) and DNA sequencing (67 samples). Other services averaged from 5 to 60 samples. DNA synthesis and purification were the services used by the greatest number of principal investigators. A number of services including DNA sequencing, mass spectrometry, capillary electrophoresis, RNA synthesis, electroblotting, and carbohydrate analysis have been introduced in the last 3 years. Although these services are characterized by high levels of methods development and non-user runs, they are offered by twice the percentage of facilities as in 1989, and are increasingly contributing to facility income.     

Biotechnology/materials: The growing interface

The biotechnology/materials interaction dates back 3.5 billion years, yet today offers novel challenges for human creativity. The materials cycle practiced by microorganisms is compared to that recently practiced by humans. The processes of the biotechnology materials cycle are biogenesis, bioleaching, biofouling, biocorrosion, biodeterioration, and bioaccumulation. Each process is examined for mechanisms, scale of effect, and opportunity for creative human intervention or utilization. More than 50 of our metallic elements are bio-processed in nature. A like number of biogenic materials have been identified, with some at production rates of trillions of kg per annum (p.a.). Microorganisms can substitute for energy, capital, and labor. Over the eons, microorganisms have gained special attributes that now offer creative humans a new era of partnership in materials processing.     

载金炭样品加工缩分系数K值的确定

对椰壳载金炭样品采用不同K值缩分法进行制样,按切乔特缩分公式进行缩分,加工制备-200目样品。采用原子吸收法对样品进行分析,计算出样品的平均含量和平均偏差,确定缩分系数K值为0.1。为载金炭样品加工制样,缩分系数K值的选择,提供了相应的依据。     

Vitamins and minerals: efficacy and safety

Safety and efficacy are crucial but separate issues for vitamin and mineral supplements. Misinterpretation of "safe and adequate" to mean "safety limit" would impose restrictions on vitamin and mineral intakes that are not needed to ensure safety. Substantial evidence indicates that intakes greater than the recommended dietary allowances (RDAs) of certain vitamins and minerals such as calcium, folic acid, vitamin E, selenium, and chromium reduce the risk of certain diseases for some people. Limitation of intakes to the RDAs would preclude reductions in disease risk from these nutrients. The margin of safety between the usual dietary intake and the intake that would produce adverse effects varies greatly among the different nutrients. Very high intakes of vitamins A and D, niacin, pyridoxine, and selenium have produced adverse effects. Many widely discussed putative adverse effects of vitamin C, vitamin E, and trivalent chromium have little factual basis. There is no evidence of adverse effects from beta-carotene supplements except in current heavy smokers.     

一种板形检测值处理方法的开发及应用

介绍了一种用于接触式分段板形仪的板形检测信号处理方法及处理流程.用该方法处理板形检测信号不需要计算带钢在板形仪上形成的包角.该法编制成程序后,作为一个模块被应用在一台可逆冷轧机的板形控制系统中.轧机投入运行后,生产稳定,并取得了良好的板形控制效果,平均板形偏差控制在5 I以下,表明该方法是稳定、有效的,可以用于工业生产.     

Narrative interaction: creating a space for therapeutic communication

This theoretical article explores the impact of ethnic appearance on the nurse-client encounter from the perspective of Chicanas, women of Mexican descent. The issues raised for Chicanas, however, are applicable for members of many other ethnic groups, individuals whose identity is often constructed from the stereotypes and myths their appearance evokes. Ethnic minority women often experience a feeling of double jeopardy, enduring the consequences of living in a society that devalues both women and members of specific racial or ethnic groups. Research from nursing, counseling psychology, and sociology provide the bases for an examination of the mental health consequences of this double jeopardy. Narrative interaction, the sharing of personal stories, is offered as a therapeutic form of communication. Through narrative interactions, nurses may begin to understand the context of women's lives and learn what is meaningful for them, from their perspective. It is from the women themselves that nurses will begin to learn new meanings for their appearance and gain some understanding of their world.     

Formation of isomorphic desolvates: creating a molecular vacuum

BACKGROUND: Microvillus inclusion disease is a congenital disorder characterized by secretory diarrhea. Patients demonstrate villus atrophy, loss of microvilli, and internalized inclusions of microvilli within the cytoplasm of small intestinal enterocytes. The exact molecular defect in these patients is not known. Two infants are described in this report with microvillus inclusion disease. Case 1 was a 3-month-old boy who developed secretory diarrhea shortly after birth. Case 2 was a 9-month-old boy who had abrupt onset diarrhea at 2 weeks of age resulting in weight loss and dehydration. Light microscopy revealed total villus atrophy with minimal crypt hyperplasia, and electron microscopic examination revealed variably shortened microvilli and cytoplasmic microvillus inclusions in both patients. METHODS: Poly (A)+ RNA was purified from duodenal biopsies and RT-PCR reactions were performed. Normal human intestinal RNA was used as a positive control. Primers specific for human NHE-1, NHE-2, NHE-3 (2 sets), sodium-glucose transporter (SGLT1), and beta-actin were used. RESULTS: Results showed that NHE-1 and beta-actin cDNAs amplified to similar levels in both patient and control samples. However, the expression of NHE-2 and SGLT1 was much higher in the control sample than in the patient samples. Additionally, NHE-3 mRNA was not detected in the patient samples using two sets of NHE-3 specific primers. CONCLUSIONS: The patients with microvillus inclusion disease have defects in apical but not basolateral membrane transport systems, and these defects are related to the pathogenesis of the disease.     

Beyond discipline: creating a culture for interdisciplinary research

Interdisciplinary research is not a common research paradigm. To venture from their customary disciplinary tenets and methods and risk new methodological approaches, or to compromise in order to accommodate the differences in the way disciplines approach research, requires the commitment of investigators. This paper discusses the interdisciplinary research paradigm, its culture, and how it differs from traditional research methods, and provides examples of successful and unsuccessful interdisciplinary research projects.     

Phytic acid, in vitro protein digestibility, dietary fiber, and minerals of pulses as influenced by processing methods

In this study we have shown that an antibody to CD18 identified a population of cells in the rabbit retina that resembled the perivascular macrophage found in other regions of the central nervous system. In the normal retina these cells possessed a ramified morphology and presented in an ordered array on the vitreal surface in association with the epiretinal vessels. Approximately 50% of the perivascular macrophages constitutively expressed MHC class II. In response to interleukin-1 beta (IL-1 beta)-induced inflammation, these cells became activated, as evidenced by a change from a ramified to an ameboid morphology and increased expression of MHC class II, and migrated away from the vessels. These changes were first detected around 3 h post-intraocular challenge coincident with the onset of inflammation. At the peak of the inflammatory response (approximately 24 h post-challenge), many activated perivascular macrophages were no longer associated with the vessels and formed long "cord" of MHC class II+ cells associated with underlying deposits of fibrin. In eyes challenged with heat-inactivated IL-1, no change in the morphology or distribution of the perivascular macrophage was noted. At 3 weeks post-challenge with IL-1, the number and distribution of the perivascular macrophages were restored to baseline values, although with a reduced cell size. Since these changes closely resemble those that occur in non-lymphoid dendritic cells in the skin, heart, and/or kidney following activation with cytokines or bacterial products, the results suggest that the perivascular macrophage represents the dendritic cell of the retina and may thus play an important role in immune surveillance in the eye and maintenance of the blood-retina barrier.