Digital Commons Network^™

Effects Of So2 In Air On Performance Of Direct Methanol Fuel Cell, Bin Qin, Fen-Ning Jing, Xue-Jing Sun, Gong-Quan Sun, Hai Sun

Journal of Electrochemistry

Direct methanol fuel cells (DMFC) generally use oxygen as an oxidant. Contaminants such as sulfides and nitrides in the air can affect the performance of the DMFC. In this work, the effects of SO₂ on the performance of DMFC were investigated and the mechanism of poisoning was analyzed, by means of constant current discharge curve, polarization performance curve, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). In the CV scan, the permeated methanol was oxidized at a low potential to eliminate its effect on the SO₂ poisoning behavior test. The results showed that the SO₂ poisoning resulted …

The Relative Financial Cost And Benefit Of An Ophthalmology Resident Compared To An Advanced Practice Provider, Optometrist, Or Faculty Ophthalmologist, Daniel Moore, William Barr

Journal of Academic Ophthalmology

Objective The main objective of the article is to determine the relative direct financial cost and benefit of an advanced practice provider (APP), optometrist, and faculty ophthalmologist compared with an ophthalmology resident.

Design Single center cost–benefit financial analysis.

Methods The direct total expenses, including mean salary and benefits; the cost/week, based upon calculated hours worked; and net revenue, based upon technical collections subtracted from total expenses were collected for all APPs, optometrists, faculty ophthalmologists, and ophthalmology residents at the University of Kentucky for the 2016 to 2017 academic year. Optometry and ophthalmology faculty collections were adjusted for clinical full-time equivalents. …

Recent Progress In Pt-Based Catalysts For Oxygen Reduction Reaction, Jing Li, Xin Feng, Zi-Dong Wei

Journal of Electrochemistry

One major challenge for a large-scale commercialization of the proton-exchange membrane fuel cells (PEMFCs) technologies that enable a shift to ‘zero-emission’ personal transportation, is the expensive and unstable Pt catalysts, which are mainly used to catalyze the sluggish kinetics of the oxygen reduction reaction (ORR) occurred on the air electrode of PEMFCs. Many research works have targets to improve the stability of Pt-based catalysts and to construct Pt/transitional metal alloys with low Pt loading amount. Herein, we provide a minireview for the Pt-based ORR catalysts based on our recent work, which covers a brief background introduction, the stability improvement of …

Search For The Rare Decay Of B+→ℓ+Νℓγ With Improved Hadronic Tagging, Belle Collaboration, R. Kroeger

Faculty and Student Publications (Open Access)

No abstract provided.

Study Of The Reactions E+E−→Π+Π−Π0Π0Π0 And Π+Π−Π0Π0Η At Center-Of-Mass Energies From Threshold To 4.35 Gev Using Initial-State Radiation, Babar Collaboration, R. Cheaib, L. Cremaldi, R. Godang, D. J. Summers

Faculty and Student Publications (Open Access)

No abstract provided.

Search For Pair-Produced Resonances Decaying To Quark Pairs In Proton-Proton Collisions At S=13 Tev, Cms Collaboration, J. G. Acosta, S. Oliveros

Faculty and Student Publications (Open Access)

No abstract provided.

Recurrent Pneumonia In Children At A Tertiary–Pediatric Hospital In Baghdad, Muhi Kadhem Al-Janabi, Nadia Aziz Nasir, Rafed Kareem Jaber, Abbas Oweid Oleiwe

Iraqi Postgraduate Medical Journal

ABSTRACT: BACKGROUND: There are many children suffering from Recurrent Pneumonia (RP). Children with RP may present a difficult diagnostic challenge. OBJECTIVE: This study was performed to evaluate the frequency levels and underlying causes of RP in Children Welfare Teaching Hospital (CWTH)/Medical City/Baghdad. PATIENTS AND METHODS: In this prospective hospital-based cross-sectional study, 107 children admitted with RP in CWTH in the period from March to July 2014. Children were included in this study if they had at least 2 times pneumonia per year or three ever in life proved by radiographic confirmation during hospital admission. Children were classified according to underlying …

Fuel Cells Reactor For Chemicals And Electric Energy Cogeneration, Zhi-Lin Heng, Xiao-Zi Yuan, Yi-Mei Yin, Zi-Feng Ma

Journal of Electrochemistry

As an energy conversion device, fuel cells can efficiently convert chemical energy into electrical energy. With the developing of technology, it is used as a reactor to conduct the synthesis of high value-added chemicals while generating electrical energy. Having benefits such as mild reaction conditions, controllability of the reaction process, high selectivity of the product, as well as high efficiency of energy utilization, it is widely used in many fields such as preparation of high value-added industrial products, gas separation, water treatment, etc. This paper introduces the current trends and statuses of fuel cell reactors in the cogeneration of chemicals …

Creative Solution Focused Counseling Models (Csfcm): Strategi Kreatif Untuk Mengembangkan Self-Regulated Learning Siswa, Wahyu Nanda Eka Saputra, Augusto Da Costa, Said Alhadi

Jurnal Kajian Bimbingan dan Konseling

The study aimed to develop CSFCM to improve student self-regulated learning. CSFCM is an application of solution-focused counseling integrated with creative arts. The developmental research consisted of three stages: (1) identify the self-regulated learning level; (2) formulating a hypothetical draft of CSFCM to improve student self-regulated learning; and (3) conducting product feasibility testing by experts and practitioners. Data analysis technique used quantitative descriptive analysis. The results showed that the CSFCM which consisting five stages of counseling was categorized as feasible to be implement in the schools.

Inhibition Of Heat-Induced Aggregation Of Tilapia Myosin By Dextran Sulfate At Low Ionic Strength, Li Ting, Zhou Chunxia, Feng Rui, Hong Pengzhi

Food and Machinery

Studied, the inhibitory effect of DS on thermal aggregation of tilapia myosin (2.0 mg/mL) in low ionic strength (1, 50, 150 mmol/L KCl) during the heat treatment (40～80 ℃, 1 ℃/min). The result showed that the myosin had poor solubility in 1 mmol/L KCl. While, with the icreased of ionic strengths, myosin fibrils could dissociate in 50 and 150 mmol/L KCl. After heating, the myosin filaments disappeared, and the heads and tails of myosin aggregated seriously, resulting in the solubility and the content of α-helix decreased significantly. After adding 0.4 mg/mL DS, the change of turbidity, solubility and α-helix content …

Rapid Quantitative Prediction Model Of Adulterated Goat Milk Based On Electronic Tongue, Han Hui, Wang Zhiqiang, Li Caihong, Ma Zeliang, Guo Tingting, Yin Tingjia

Food and Machinery

In order to discriminate adulterated goat milk quickly and objectively, a set of portable electronic tongue detection system was exploited, and a new method of fast identification is developed. When detected in the system, the sample solution was first scanned to obtain the "fingerprint" information of adulterated goat milk, and then the discrete wavelet transform (DWT) was used to obtain the characteristics of the "fingerprint" data. On this basis, the principal component analysis (PCA) was used to determine the quality of goat milk with different adulteration ratio. Particle swarm optimization extreme learning machine (PSO-ELM) was applied to quantitatively predict goat …

Study On The Packaging Quality Stability Of Paper-Packaging Machines For Chinese Dried Noodles, Zong Xiangdong, Fu Junhui, Jiao Zuiping, Wang Ruibin, Zhao Bo, Wei Yimin

Food and Machinery

To determine the packaging quality stability of paper-packaging machines (HNQ) for Chinese dried noodles based on the key technology improvement, and to meet demands from noodle industries to packaging stability and efficiency, the production lines of a dried noodles manufacturing industry were sampled for investigation. The packaging effects of two kinds of packaging machines (HNQ and SDH) and four same machines in a line were for each kind were tested and analyzed. The results showed that no significant difference in the instant weight of packaged noodles between the SDH packaging machines was found. The differences of coefficient variation (CV%) among …

Research Progress On Functional Composition Andcomprehensive Utilization Of Passion Fruit, Zhu Wenxian, Xia Bibang, Liao Hongmei

Food and Machinery

Summarizes the extraction of functional composition, pharmacological activities, processing and comprehensive utilization of passion fruit. Simultaneously, corresponding problems in research process of passion fruit have also been expounded. Theoretical references for subsequent research and product development would be provided.

Effects Of Lactobacillus Fermentation On The Quality And Nutrient Of Tartary Buckwheat Seedling Beverage, Li Jun, Lu Yang, Liu Yongxiang, Liu Hui

Food and Machinery

Bulgarian Lactobacillus, Streptococcus thermophilus and Lactobacillus plantarum were inoculated into tartary buckwheat seedling beverage for fermentation, and the changes of sensory score, number of live Lactobacillus, total sugar, reducing sugar, total acid, total protein, total flavone, rutin, quercetin and kaempferol 3-rutinoside were compared for the better lactic acid bacteria fermentation strains. The results showed that Lactobacillus could grow well in tartary buckwheat seedling beverage, and the fermentation activity of L. plantarum was higher than that of the other two lactobacilli, and the mixed fermentation of L. plantarum and L. bulgaricum had synergistic effect, and the product sensory score was the …

Identitas Sosial Remaja Suku Mandar Dalam Pappasang: Implikasi Bagi Penyusunan Bahan Bimbingan, Andy Wahyu Irawan, Andi Mappiare-At, Muslihati Muslihati

Jurnal Kajian Bimbingan dan Konseling

Pappasang is a Mandar Tribe cultural product which contains advice. This advice has a characteristic describes the tribe identity of Mandar Tribe. This study aimed to examine the social identity of the Mandar Tribe adolescents in Pappasang as well as the foundation of guidance material. The qualitative study of gadamerian hermeneutics interpreted the social identity of Mandar Tribe adolescents in Pappasang. The findings showed the social identity are: empathy; remind each other; mutual help; solidarity; keep the disgrace on a secret; obedient; generous; democratic. Then, the social identity in Pappasang constructed to be material for guidance and counseling.

Keefektifan Biblioterapi Untuk Meningkatkan Resiliensi Siswa Yatim Piatu Penghuni Panti Asuhan, Eem Munawaroh, Afriyadi Sofyan

Jurnal Kajian Bimbingan dan Konseling

This study aimed to examine the effectiveness of bibliotherapy to improve three factors of resilience, namely: aspects of I Have; I Am; and I Can, for orphaned students who live in orphanages. The research subjects were 21 orphaned students selected using purposive sampling technique. The quantitative research used the latin square method and statistical analysis paired t-test to analyze the data. The analysis technique of the instrument validity use Spearman. Meanwhile, the analysis technique of instrument reliability used Alpha Cronbach. The results showed that bibliotherapy can significantly improve the three factors of resilience.

Pengembangan Aplikasi Assessment Menggunakan Media Short Message Service, Guruh Sukma Hanggara, Santy Andrianie, Restu Dwi Ariyanto

Jurnal Kajian Bimbingan dan Konseling

sms; application; need analysis

Pola Asuh Autoritatif Dan Jenis Kelamin Sebagai Prediktor Big Five Personality Factors: Implikasinya Bagi Pelayanan Bimbingan Dan Konseling, Zummy Anselmus Dami, Santi Curniati

Jurnal Kajian Bimbingan dan Konseling

The study aimed to determine the authoritative parenting; gender; gender and the influence of authoritative parenting significantly toward big five personality. This quantitative research with descriptive analysis techniques of Multivariate Analysis of Covariance (MANCOVA) test involved 62 students of eleventh grade of Sekolah Menengah Atas Negeri 2 Kupang as a respondent. Data collection technique used the scale instrument of Parental Authority Questionnaire and the International Personality Item Pool. The results showed that: (1) there was no significant influence of parental authority on the subjects’s big five personality, except extraversion; (2) there was no significant effect of gender on subjects’s big …

Innovations In Leadership Development: Centering Communities Of Color, Ann Curry-Stevens

School of Social Work Faculty Publications and Presentations

With innovative funding from a large local foundation, communities of color in Portland, Oregon developed an array of leadership programs to serve communities of color. This article shares the models they developed, including overviews of curriculum, theories of change, and concrete evidence-based gains achieved by the programs. Innovations include a leadership model that is rooted in community leadership, and the emergence of community priorities to guide the programs, alongside culturally-specific programs that are effective in reaching and supporting the participation of emerging and existing leaders of color. Community priorities included advocacy engagement that resulted in achieving real gains during the …

Progress Of Self-Humidifying Membrane Electrode Assembly For Low Temperature Proton Exchange Membrane Fuel Cell, Bin Chi, Yue-Kun Ye, Shi-Jie Jiang, Shi-Jun Liao

Journal of Electrochemistry

The self/non-humidification membrane electrode assembly(SH-MEA)is an important pathway towards the self- humidification fuel cell and plays a crucial role for the large scale commercialization of low temperature proton exchange membrane fuel cell (LT-PEMFC), because it not only can reduce the volume and complexity of fuel cell system, resulting in the decrease of the cost, but also can improve the output power density of the fuel cell system. Currently, the researches on the self-humidifying MEA of LT-PEMFC mainly focus on three aspects: the preparation of self-humidification proton exchange membrane, the construction of self-humidification catalyst layer, and the construction of composite self-humidifying …

A Review Of Proton Exchange Membrane Fuel Cell Catalyst Layer By Electrospinning, Yong Liu, Han Ding, De-Chun Si, Jie Peng, Jian-Bo Zhang

Journal of Electrochemistry

The limitation of catalyst layer for proton exchange membrane fuel cell (PEMFC) in cost, durability and performance constitutes the bottleneck for the commercialization of fuel cell vehicles. Electrospun catalyst layer, with high catalyst utilization, increased triple phase boundary (TPB) and triple phase channel (TPC), has been developed by many researchers. This paper reviews the research progress in the electrospun catalyst layer for PEMFC, combined with the author’s work. Firstly, the development progress of catalyst layer is summarized, and the catalyst layer is classified and analyzed based on its fabrication method and structure character. Next, the fabrication process, physical property characterization, …

Fe-N Doped Hollow Carbon Nanospheres Linked By Carbon Nanotubes For Oxygen Reduction Reaction, Ya-Lin Zhang, Chi Chen, Liang-Liang Zou, Zhi-Qing Zou, Hui Yang

Journal of Electrochemistry

The development of non-precious metal catalysts for oxygen reduction reaction (ORR) is essential for large-scale application of proton exchange membrane fuel cells. Herein, we present the in situ formed Fe-N doped hollow carbon nanospheres linked by carbon nanotubes composite, synthesized by using ZIF-8 as sacrificed template to form polydopamine (PDA) hollow nanospheres, followed by complexing with FeCl₃, high temperature heat-treatment and NH₃-etching. ZIF-8 was gradually decomposed simultaneously with PDA coating due to the loss of Zn²⁺ grabbed by PDA. NH3 etching resulted in the improved surface area, while the reducibility of NH₃ resulted in …

Facile Synthesis Of Pt-Cu Alloy Nanodendrites As High-Performance Electrocatalysts For Oxygen Reduction Reaction, Liu-Xuan Luo, Guang-Hua Wei, Shui-Yun Shen, Feng-Juan Zhu, Chang-Chun Ke, Xiao-Hui Yan, Jun-Liang Zhang

Journal of Electrochemistry

Structures and compositions have significant effects on the catalytic properties of nanomaterials. Herein, a facile etching-based method was employed to synthesize Pt-Cu nanodendrites (NDs) with uniform and homogeneous alloy structures for enhancing oxygen reduction reaction (ORR). The formation of dendritic morphology was ascribed to the etching effect caused by the oxidative etchants of the Br^-/O₂ pair. The atomic ratio of Pt/Cu in Pt-Cu NDs could be easily tuned by altering the ratio of the Pt/Cu precursors, without deteriorating the dendritic morphology. The most active carbon-supported Pt₁Cu₁ NDs (Pt₁Cu₁ NDs/C) exhibited the …

Acid Treated Carbon As Anodic Electrocatalysts Toward Direct Ascorbic Acid Alkaline Membrane Fuel Cells, He-Mu Chen, Chen-Xi Qiu, Yuan-Yuan Cong, Hui-Yuan Liu, Zi-Hui Zhai, Yu-Jiang Song

Journal of Electrochemistry

In order to improve the hydrophilicity and electrocatalytic activity, commercial carbon black (BP 2000) was subjected to acid treatment to obtain acid-treated carbon (ATC). The generation of rich oxygen-containing groups on the surface of the ATC was proved by X-ray photoelectron spectra (XPS), Fourier transform-infra red spectra (FTIR), thermogravimetric analysis (TG) and contact angle measurement. UV-vis spectra were firstly recorded to calculate activation energy (Ea) of ascorbic acid (AA) chemical oxidation in alkaline conditions by oxygen in air and the Ea value was determined to be 37.1 kJ·mol^-1. Additionally, electrochemical impedance spectra (EIS) were used to evaluate unprecedented …

Palladium Adatoms On Gold Nanoparticles As Electrocatalysts For Ethanol Electro-Oxidation In Alkaline Solutions, Hui-Mei Chen, Shang-Qian Zhu, Jia-Le Huang, Min-Hua Shao

Journal of Electrochemistry

Palladium (Pd) is a good catalyst for ethanol electro-oxidation in alkaline solutions. The activity of Pd is further improved in this study by modifying the gold (Au) nanoparticles with Pd adatoms using a simple spontaneous deposition process. The Pd overlayer on the Au core (Au@Pd) is un-uniform with some Au atoms exposed to the electrolyte. The activity of Au@Pd/C toward ethanol oxidation reaction (EOR) is much higher than that of Pd/C in an alkaline solution. The peak current density of Au@Pd/C is 4.6 times higher than that of Pd/C with a 100 mV lower onset potential. The enhanced activity may …

Pd/C Catalysts For Co2 Electroreduction To Co:Pd Loading Effect, Dun-Feng Gao, Cheng-Cheng Yan, Guo-Xiong Wang, Xin-He Bao

Journal of Electrochemistry

Nanostructured heterogeneous catalysts have been widely used in the electrochemical carbon dioxide (CO₂) reduction reaction (CO₂RR), which can simultaneously achieve the electrocatalytic conversion of CO₂ to fuels and the storage of renewable energy sources. Carbon supported palladium nanoparticles (Pd/C) catalysts have been previously reported to show excellent CO₂RR performance. However, the crucial role of the metal loading in supported electrocatalysts has been rarely reported. In this work, we study the Pd loading effect on the structure of Pd/C catalysts as well as their activity and selectivity of CO₂RR to CO. The …

Voltage Distribution Of Self-Humidifying Air-Cooled Pemfc, Kai-Feng Tan, Wei-Rong Chen, Ming Han, Xue-Xia Zhang

Journal of Electrochemistry

In this work, the self-adaptive characteristics of self-humidifying air-cooled PEMFC stack was investigated. The performance and the unit-cell voltage distribution of the stack were measured and analyzed through the unit-cell I-V curve fitting. The operating conditions for this experimental study were set as follows: hydrogen pressure at the anode was 2 bar, the fan power used for the reactant oxygen feed and stack cooling was at 0.3 W, and the duration and time gap of water purged from hydrogen chamber were 1 s and 10 s, respectively. The experimental results showed that the self-humidifying air-cooled PEMFC stack used for this …

Durability Performance Of The High-Power Fuel Cell System, Ke-Yong Wang, Wei-Yu Shi, Ren-Fang Wang, Jia Liu, Zhong-Jun Hou

Journal of Electrochemistry

Fuel cell durability is the crucial challenge in fuel cell vehicle, and the lifetime of more than 5000 hours is believed to be necessary for vehicle application. Few works on durability test of the full fuel cell system have been reported. In this work, the long lifetime HySYS-30 fuel cell system was developed in Sunrise Power based on the improved MEA durability and system control strategy. The durability performance of the system was investigated under vehicle duty cycle for more than 6000 hours, and only 8.1% performance loss was observed, implying that the durability of HySYS-30 fuel cell system could …

Caging Porous Co-N-C Nanocomposites In 3d Graphene As Active And Aggregation-Resistant Electrocatalyst For Oxygen Reduction Reaction, Lu-Yang Xiu, Meng-Zhou Yu, Peng-Ju Yang, Zhi-Yu Wang, Jie-Shan Qiu

Journal of Electrochemistry

Oxygen reduction reaction (ORR) is the cornerstone reaction of many renewable energy technologies such as fuel cells and rechargeable metal-air batteries. The Pt-based electrocatalysts exhibit the highest activity toward ORR, but their large implementation is greatly prohibiting by unaffordable cost and inferior durability. During electrode manufacturing and electrochemical reaction, severe aggregation of catalyst nanoparticles induced by size effect further limits the operational performance of electrocatalysts. We report a new strategy for fabrication of active and aggregation-resistant ORR electrocatalyst by caging metal-organic frameworks derived Co-N-C nanocomposites in permeable and porous 3D graphene cages via sprayed drying the mixed colloids of ZIF-67 …

Surgical Experience In Mediastinal Cysts: At The Thoracic And Vascular Department In Ghazi Al Hariri, Surgical Subspecialties Hospital, Medical City,Baghdad, Iraq, Hussein Aboob Alkabi, Looiy Mohammed Yousif Al-Hallaq, Abdul Khalik Zaki Benyan, Mohammed S Abdilqadir

Iraqi Postgraduate Medical Journal

ABSTRACT: BACK GROUND: Cystic lesions of the mediastinum are not uncommon, comprising 20% to 32% of all primary mediastinal tumors. They are particularly significant because of the difficulty in making a differential diagnosis: they can simulate multiple lesions, both benign and malignant. OBJECTIVE: The objectives of this study were to review the clinical presentations and the results of surgery in patients with mediastinal cysts. PATIENTS AND METHODS: A retrospective study of twenty-two patients with mediastinal cysts, who were admitted and surgically treated at Ghazi Al-Hariri for surgical sub specialties hospital during ten years from January 2003 to December 2013. Clinical …