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Flocculated unclassified tailings settling efficiency improvement by particle collision optimization in the feedwell

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2126-2135页

作者： Huazhe Jiao Weilin Chen Aixiang Wu Yang Yu Zhuen Ruan rick Honaker Xinming Chen Jianxin Yu School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454003China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China School of Surveying and Land Information Engineering Henan Polytechnic UniversityJiaozuo 454000China China Geological Environmental Monitoring Institute Beijing 100081China State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization Jiaozuo 454150China Mining Engineering Faculty University of KentuckyLexington 40506America

Efficient thickening of tailings is a prerequisite for the metal mine tailings backfill and surface disposal *** effective collision of ultrafine tailings particles in suspension with flocculant molecules is essential for flocs aggregates formation and *** feeding speed and flocculant adding method will lead to the failure of effective dispersion of flocculant and high particle content in thickener *** this work,the effect of turbulence intensity and flocculant adding method on floc size,strength,and movement characteristics are *** to solve the turbidity increased,a pilot-scale continuous thickening test was carried *** a single particle and multiple flocs of full tailings as the research object,the particle iterative settlement model of flocs was *** influence of turbulence intensity on collision effect is studied by tracking and simulating particle *** results show that in the process of single particle settlement,chaos appears in the iterative process owing to particle adhesion which caused by micro *** the turbulence intensity is 25.99%,the maximum particle size of tailings floc is 6.21 mm and the maximum sedimentation rate is 5.284 cm·s^(−1).The tailings floc presents a multi-scale structure of particle-force chain system when hindered settling,and the interweaving of strong and weak force chains constitutes the topological structure of *** results are applied to a thicker in plant,the flocculant addition mode and feed rate are optimized,and the flocs settling speed and overflow clarity are improved.

关键词： unclassified tailings flocculation settling rate thickener feedwell turbulence intensity flocs micro-structure

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Metamorphic Temperature Investigation of Coexisting Calcite and Dolomite Marble Examples from Nikani Ghar Marble and Nowshera Formation,Peshawar Basin,Pakistan

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Journal of Earth Science 2016年第6期27卷 989-997页

作者： Muhammad Fahad Yaseen Iqbal Mohammad Riaz rick Ubic Simon A. T. Redfern Department of Electrical Engineering COMSATS Institute of Information Technology Abbottabad 22010 Pakistan Materials Research Laboratory Department of Physics University of Peshawar Peshawar 25120 Pakistan National Centre of Excellence in Geology University ofPeshawar Peshawar 25120 Pakistan College of Engineering Boise State University Boise 83401 USA Department of Earth Sciences University of Cambridge Cambridge 999020 United Kingdom

Using marble samples from the Nikani Ghar marble and Nowshera Formation from Northern Pakistan the determination of the temperature of metamorphism was undertaken with the help of calcite-dolomite solvus geothermometer. Two types of marbles, that is, calcite-dolomite marble and quartz-bearing calcite-dolomite marble were selected. Petrographic and scanning electron microscope analysis of dolomite samples indicated different grain sizes. X-ray diffraction technique indicated the calcites MgCO3 content up to 7.93 mol.%. Nikani Ghar marble samples have shown lower contents of MgCO3 as compared to samples from Nowshera Formation. The calcite-dolomite-quartz marble has also showed relatively lower MgCO3 content and hence rather low temperature （-500 ℃）. The temperature reached during peak metamorphism of the investigated marble occurrence, based on calcitedolomite solvus was 628 ℃. Metamorphic temperatures derived from the present study were shown as a linear graph and values were in good agreement with the published literature.

关键词： calcite dolomite metamorphic temperature geothermometer X-ray diffraction.

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Outage Detection for Distribution Networks Using Limited Number of Power Flow Measurements

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Journal of Modern Power Systems and Clean Energy 2020年第2期8卷 315-324页

作者： Basel Alnajjab Ananth Narayan Samudrala Chen Chen rick S.Blum Soummya Kar Emma M.Stewart the Department of Electrical and Computer Engineering Lehigh UniversityBethlehemPA18015USA the School of Electrical Engineering Xi'an Jiaotong UniversityXi'an 710049 the Department of Electrical and Computer Engineering Carnegie Mellon UniversityPittsburgh.PA15213USA Lawrence Livermore National Laboratory LivermoreCA94550USA

Accurate topology estimation is crucial for effectively operating modern distribution *** outages in a distribution network change the network topology by disconnecting some parts of the network from the main *** this paper,an outage detection(or topology estimation)algorithm for radial distribution networks is *** algorithm utilizes noisy power flow measurements collected from a subset of lines in the network,and statistical information characterizing errors in forecasting load ***,a sensor placement scheme is *** sensor placement provides critical sensing for the outage detection algorithm so that any number of possible outages in the network can be *** performance of the proposed outage detection algorithm using the proposed sensor placement is demonstrated through several numerical results on the IEEE 123-node test feeder.

关键词： Outage detection distribution networks maximum likelihood(ML)detection sensor placement

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Mate assessment behavior is correlated to learning ability in female threespine sticklebacks

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Current Zoology 2019年第3期65卷 295-304页

作者： Taylor L.RYSTROM Theo C.M.BAKKER Ingolf P.rick Department of Behavioural Biology University of Munster Badestrasse 13 Munster 48149 Germany Institute for Evolutionary Biology and Ecology University of Bonn An der Immenburg 153121 Bonn Germany

In many species, males signal quality with elaborate traits, but females often show inter-individual variation in pref ere nee for these traits. Choosi ng a mate requires multiple cog nitive steps;therefore, cog nitive style (how an in dividual processes information) likely in fluences the perception of sexual signals and ability to choose a high-quality mate. An important component of cognitive style is flexibility;cognitively flexible individuals are more perceptive to shifts in cues. We hypothesized that cognitively flexible individuals would acquire more information about potential mates, better discern between two quality-signaling traits, and thus be more discriminatory. Here, we show that mate assessment is correlated to other cognitive traits. Although we did not detect an effect of cogn itive style on mate pref ere nee or discriminatio n, we found that female threespi ne sticklebacks Gasterosteus aculeatus that spent more time assessing potential mates (more responsive) in a dichotomous mate choice task reached both the initial and reversal learning criterion in a spatial learning task with fewer errors. However, these highly responsive females made more consecutive mistakes immediately at the beginning of the reversal phase, suggest!ng that they did not quickly adapt to the en vironmental cha nge but in stead rapidly formed strict routi nes duri ng the learning task that were eventually reversible after repeated errors. Furthermore, we found evidenee for condition-dependent mate pref ere nee, with larger females preferring the high-quality male. These are among the first results that illustrate how cog nitive traits might in flue nee mate choice, which has implicati ons for the st re ngth and di recti on of sexual selection.

关键词： cognition cognitive flexibility choosiness computer animation mate choice sexual selection

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创建无缝WiMax交换结构

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电子设计技术 EDN CHINA 2008年第7期15卷 60-60,62,64,66页

作者： rick Nelson Ron wilson EDN

WiMax已蓄势待发，准备扩大在PC联网和手机通信领域的覆盖范围。半导体生产商在推广WiMax芯片组，而测试设备厂商则在提供芯片组和相关产品的测试所需的实验室仪器和生产ATE系统。WiMax有望作为一种PC联网技术，也有潜力成为蜂窝通信技... 详细信息

WiMax已蓄势待发，准备扩大在PC联网和手机通信领域的覆盖范围。半导体生产商在推广WiMax芯片组，而测试设备厂商则在提供芯片组和相关产品的测试所需的实验室仪器和生产ATE系统。WiMax有望作为一种PC联网技术，也有潜力成为蜂窝通信技术（见附文《WiMax市场与机遇》）。Aeroflex（艾法斯）公司的PaulArgent预计wiMax最初将把宽带无线访问能力带给笔记本电脑，尽管WiMax论坛成员认为，WiMax是一种有多种应用的技术，其中包括蜂窝电话。他说，未来两年，WiMax将主要为咖啡店和行驶车辆中的PC提供高速数据访问能力。

关键词： WiMax 交换结构无线访问能力无缝联网技术测试设备蜂窝电话 ATE系统

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The vaginal and fecal microbiomes are related to pregnancy status in beef heifers

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Journal of Animal Science and Biotechnology 2020年第1期11卷 58-70页

作者： Feilong Deng Maryanna McClure rick Rorie Xiaofan Wang Jianmin Chai Xiaoyuan Wei Songjia Lai Jiangchao Zhao Department of Animal Science Division of AgricultureUniversity of ArkansasFayettevilleARUSA Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province Sichuan Agricultural UniversityChengduChina Special Key Laboratory of Microbial Resources and Drug Development Research Center for Medicine and BiologyZunyi Medical UniversityZunyiChina.

Background:The greatest impact on profitability of a commercial beef operation is ***,in beef heifers,little is known about the vaginal and fecal microbiota with respect to their relationship with *** this end,we followed heifers through gestation to examine the dynamics of vaginal and fecal microbial composition throughout ***:Heifers were exposed to an estrus synchronization protocol,observed over a 12-day period,artificially inseminated 12 h to 18 h after observed estrus,and subsequently exposed to bulls for a 50-day breeding *** samples were taken at pre-breeding(n=72),during the first(n=72),and second trimester(n=72)for all individuals,and third trimester for individuals with confirmed pregnancies(n=56).Fecal samples were taken at prebreeding(n=32)and during the first trimester(n=32),including bred and open *** generation sequencing of the V4 region of the 16 S rRNA gene via the Illumina Mi Seq platform was applied to all *** indices and the number of observed bacterial features were the same in fecal ***,significant differences in vaginal microbiome diversity between gestation stages were *** differences in beta-diversity were detected in vaginal or fecal samples regarding pregnancy status,but such differences were seen with fecal microbiome over *** Forest was developed to identify predictors of pregnancy status in vaginal(e.g.,Histophilus,Clostridiaceae,Campylobacter)and fecal(e.g.,Bacteroidales,Dorea)***:Our study shows that bovine vaginal and fecal microbiome could be used as biomarkers of bovine *** experiments are needed to validate these biomarkers and to examine their roles in a female’s ability to establish pregnancy.

关键词： Beef cattle Pregnancy Random forest Reproduction Vaginal microbiome

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Distribution of Colloidal and Powdered Activated Carbon for the <i>in Situ</i>Treatment of Groundwater

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Journal of Water Resource and Protection 2020年第12期12卷 1001-1018页

作者： rick McGregor In Situ Remediation Services Ltd. St George Canada

The use of in situ technologies for the treatment of groundwater containing various compounds of concern are widely accepted. These technologies include chemical reduction, chemical oxidation, anaerobic and aerobic bioremediation, and adsorption, among others. One requirement for the successful application of these technologies is the delivery of the remedial reagent(s) to the compounds of concern. A rapidly evolving in situ technology is the injection of adsorptive media such as activated carbon and ion-exchange resin including powdered or colloidal activated carbon. Activated carbon has a long-demonstrated history of effectiveness for the removal of various organic and inorganic compounds in above ground water treatment systems. However, due to constraints related to the particle size and physical properties of the activated carbon, the in situ application of activated carbon has been limited. Recent developments in the manufacturing of activated carbon have created a smaller particle size allowing activated carbon to be applied in situ. To evaluate if powdered and colloidal activated carbon can be effectively distributed in aquifers, the two types of carbon were injected using direct push technology adjacent to each other at four sites with varying geology. Evaluation of distribution was completed by sampling the aquifer prior to and post-injection for total organic carbon. The results of the studies indicated that both forms of activated carbon were effectively delivered to the targeted injection zones with both carbon types being detected at least seven meters away from the point of injection. The colloidal form of the activated carbon showed good distribution throughout the four targeted zones of injection with 93 percent of the samples collected having colloidal activated carbon present within them whereas the powdered activated carbon cells were more susceptible to aquifer heterogeneity with only 67 percent of the samples

关键词： In situ Remediation Groundwater Colloidal Powdered Activated Carbon

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The Two Cultures of Science: Implications for University-Industry Relationships in the U.S. Agriculture Biotechnology

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Journal of Integrative Agriculture 2014年第2期13卷 455-466页

作者： William B Lacy Leland L Glenna Dina Biscotti rick Welsh Kate Clancy University of California State College Pennsylvania State University Syracuse University Johns Hopkins University

Partnerships between U.S. universities and industries have existed for several decades and in recent years have become generally more varied, wider in scope, more aggressive and experimental and higher in public visibility. In addition, in the last few decades, public and private interests have advocated for government policies and laws to globally promote the commercialization of university science. This paper examines the persistence or convergence of the two cultures of science and the implications of this commercialization for university-industry relationships in agriculture biotechnology. The perceptions and values of over 200 U.S. university and industry scientists, managers and administrators who participate in or oversee research collaborations in agricultural biotechnology were analyzed. The findings revealed that the participants in these research relationships continue to perceive very distinct cultures of science and identify a wide range of concerns and disadvantages of these partnerships. Several actions were discussed to ensure that the two cultures serve complementary roles and that they maximize the public benefits from these increasing collaborations.

关键词： two cultures of science agricultural biotechnology university-industry relationships

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Influence of lighting environment on social preferences in sticklebacks from two different photic *** preferences of wild-caught females

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Current Zoology 2021年第3期67卷 299-308页

作者： Meike Hiermes Stephanie REHER Ingolf P.rick Theo C.M.Bakker Institute for Evolutionary Biology and Ecology University of BonnAn der Immenburg 1Bonn53121Germany Institute of Zoology Functional EcologyUniversity of HamburgMartin-Luther-King-Platz Hamburg 20146Germanyand Institute of ZoologyUniversity of BonnMeckenheimer Allee 169Bonn53115Germany

Ultraviolet(UV)A signals(320-400 nm)are important in mate choice in numerous *** sensitivity for UV signals is not only assumed to be costly,but also expected to be a function of the prevailing ecological ***,those signals are favored by selection that efficiently reach the receiver.A decisive factor for color signaling is the lighting environment,especially in aquatic habitats,as the visibility of signals,and thus costs and benefits,are instantaneously influenced by *** ecological aspects of color signal evolution are relatively well-studied,there is little data on specific effects of environmental UV-light conditions on signaling at these shorter *** studied wild-caught gravid female 3-spined sticklebacks Gasterosteus aculeatus of 2 photic habitat types(tea-stained and clear-water lakes),possessing great variation in their UV *** 2 treatments,tea-stained and clear-water,preferences for males viewed under UV-present(UV-1-)and UV-absent(UV-)conditions were tested.A preference for males under UV+conditions was found for females from both habitat types,thus stressing the significance of UV signals in stickleback's mate choice ***,females from both habitat types showed the most pronounced preferences for males under UV-h conditions under clear-water test ***,reflectance measurements revealed that the carotenoid-based orange-red breeding coloration in wild-caught males of both habitat types differed significantly in color intensity(higher in clear-water males)and hue(more red shifted in clear-water males)while no significant differences in UV coloration were *** differential reflection patterns in longer wavelengths suggest that sticklebacks of both habitat types have adapted to the respective water *** of UV signals in a sexual context to ambient light conditions in both behavior and coloration seem less evident.

关键词： color signals female mate preference Gasterosteus aculeatus lighting environment sensory drive UV vision

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John McDowell and the Future of Film Studies

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Journal of Philosophy Study 2014年第6期4卷 423-429页

作者： rick Costa Carnegie Mellon University

A key issue for the future direction of film studies is what is the nature of the perception film viewers have of a film and what is the nature of the perception characters in a film have of other characters in the film. The debate between the philosophers John McDowell and Hubert Dreyfus over the nature of perception in general illuminates this issue. McDowell argues that we must see perception as conceptual, while Dreyfus supports a non-conceptual view. McDowell＇s concept of second nature not only resolves this debate in his favor, but it provides a promising tool for the interpretation of individual films. Moreover, McDowell＇s conceptual view of perception rules out those approaches to the future of film studies that are based on a non-conceptualist framework. Finally, McDowell＇s approach leads to an emphasis on interpreting films with a focus on improving moral sensibilities. This perspective provides a viable blueprint for keeping film studies viable.

关键词： film studies surveillance films The Lives of Others philosophy of perception conceptualism JohnMcDowell Hubert Dreyfus Robert Sinnerbrink

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