bluuebunny/crossref_metadata_2025 huggingface dataset:
Synchronous primary tumors of the endometrium and ovary
Authors: Karki S , Chapagain U
Published: March 2012

Background: Primary synchronous cancer of the female genital tract is a relatively uncommon. Simultaneously detected endometrial and ovarian malignancies constitute the commonest occurrence. A set of pathological criteria has been described to differentiate synchronous primaries from metastatic tumors. The purpose of this study was to characterize patients with synchronous primary endometrial and ovarian tumors. Materials and Methods: This was a retrospective study done in Department of Pathology, Tribhuwan University Teaching Hospital from September 2006 to August 2011. The datas were retrieved from computer database. Results: There were totally of 10 cases of simultaneously detected endometrial and ovarian cancers. Out of 10 cases, 7 cases were synchronous primary endometrial and ovarian cancers while three were metastatic. Median age at presentation was 47.4 years. Six (85.8%) of these patients presenting with dual primary tumors were premenopausal. Grade 1 histology was seen in 57% of endometrial and 42% of ovarian tumors. Atypical endometrial hyperplasia was found in 42.8% of cases while none of the cases showed endometriosis. Conclusion: Though limited by relatively small number of cases, younger and premenopausal women were predisposed to developing synchronous primary tumors of the endometrium and ovary. DOI: http://dx.doi.org/10.3126/jpn.v2i3.6019 JPN 2012; 2(3): 189-192
Bone marrow evaluation in patients with fever of unknown origin
Authors: Jha A , Adhikari RC , Sarda R
Published: March 2012

Bone marrow examination is commonly requested investigations in cases of fever of unknown origin, irrespective of alteration in hematological parameters. More than 200 etiologies are associated with fever of unknown origin, and they are broadly divided into infectious, neoplastic, collagen vascular diseases, miscellaneous and undiagnosed. Many of these conditions directly or indirectly affect bone marrow. Marrow may show changes in cellular components, interstitium or in the blood vessels depending on the underlying local or systemic conditions. The three main hematopoietic cell lines may show variable hyperplasia, hypoplasia or aplasia of one or more than one cell lines, and occasionally dyspoiesis. Interstitium may show fibrosis, gelatinous transformation, or infiltration by abnormal cells. Amyloid deposits may be seen around blood vessels. Marrow may also show granulomas, infectious agents or neoplastic cells. Various reactive changes can be seen in the bone marrow in neoplastic, infectious and in connective tissue diseases. Infectious agents can be cultured from the marrow aspirate or can be demonstrated in marrow. DOI: http://dx.doi.org/10.3126/jpn.v2i3.6029 JPN 2012; 2(3): 231-240
Applied Genetics and Genomics in Alfalfa Breeding
Authors: Li Xuehui , Brummer E. Charles
Published: March 2012

Alfalfa (Medicago sativa L.), a perennial and outcrossing species, is a widely planted forage legume for hay, pasture and silage throughout the world. Currently, alfalfa breeding relies on recurrent phenotypic selection, but alternatives incorporating molecular marker assisted breeding could enhance genetic gain per unit time and per unit cost, and accelerate alfalfa improvement. Many major quantitative trait loci (QTL) related to agronomic traits have been identified by family-based QTL mapping, but in relatively large genomic regions. Candidate genes elucidated from model species have helped to identify some potential causal loci in alfalfa mapping and breeding population for specific traits. Recently, high throughput sequencing technologies, coupled with advanced bioinformatics tools, have been used to identify large numbers of single nucleotide polymorphisms (SNP) in alfalfa, which are being developed into markers. These markers will facilitate fine mapping of quantitative traits and genome wide association mapping of agronomic traits and further advanced breeding strategies for alfalfa, such as marker-assisted selection and genomic selection. Based on ideas from the literature, we suggest several ways to improve selection in alfalfa including (1) diversity selection and paternity testing, (2) introgression of QTL and (3) genomic selection.
Behavioral Effects of Upper Respiratory Tract Illnesses: A Consideration of Possible Underlying Cognitive Mechanisms
Authors: Smith Andrew P.
Published: March 2012

Previous research has shown that both experimentally induced upper respiratory tract illnesses (URTIs) and naturally occurring URTIs influence mood and performance. The present study investigated possible cognitive mechanisms underlying the URTI-performance changes. Those who developed a cold (N = 47) had significantly faster, but less accurate, performance than those who remained healthy (N = 54). Illness had no effect on manipulations designed to influence encoding, response organisation (stimulus-response compatilibility) or response preparation. Similarly, there was no evidence that different components of working memory were impaired. Overall, the present research confirms that URTIs can have an effect on performance efficiency. Further research is required to identify the physiological and behavioral mechanisms underlying these effects.
Games with Synergistic Preferences
Authors: Jamison Julian
Published: March 2012

Players in economic situations often have preferences not only over their own outcome but also over what happens to fellow players, entirely apart from any strategic considerations. While this can be modeled directly by simply writing down final preferences, these are commonly unknown a priori. In many cases it is therefore both helpful and instructive to explicitly model these interactions. This paper presents a simple structure in the context of game theory, building on a model due to Bergstrom, that incorporates these ‘synergisms’ between players. It is powerful enough to cover a wide range of such interactions and model many disparate experimental and empirical results, yet straightforward enough to be used in many applied situations where altruism, or a baser motive, is implied.
Arsenic and Antimony Transporters in Eukaryotes
Authors: Maciaszczyk-Dziubinska Ewa , Wawrzycka Donata , Wysocki Robert
Published: March 2012

Arsenic and antimony are toxic metalloids, naturally present in the environment and all organisms have developed pathways for their detoxification. The most effective metalloid tolerance systems in eukaryotes include downregulation of metalloid uptake, efflux out of the cell, and complexation with phytochelatin or glutathione followed by sequestration into the vacuole. Understanding of arsenic and antimony transport system is of high importance due to the increasing usage of arsenic-based drugs in the treatment of certain types of cancer and diseases caused by protozoan parasites as well as for the development of bio- and phytoremediation strategies for metalloid polluted areas. However, in contrast to prokaryotes, the knowledge about specific transporters of arsenic and antimony and the mechanisms of metalloid transport in eukaryotes has been very limited for a long time. Here, we review the recent advances in understanding of arsenic and antimony transport pathways in eukaryotes, including a dual role of aquaglyceroporins in uptake and efflux of metalloids, elucidation of arsenic transport mechanism by the yeast Acr3 transporter and its role in arsenic hyperaccumulation in ferns, identification of vacuolar transporters of arsenic-phytochelatin complexes in plants and forms of arsenic substrates recognized by mammalian ABC transporters.
Synthesis of Tetrasubstituted Alkenes via Metathesis
Authors: Paek Seung-Mann
Published: March 2012

Fully substituted olefin generation via metathesis is presented. Catalyst development, optimization of reaction conditions and substrate screening are included. In addition, asymmetric alkene metathesis, the cross metathesis reaction for this transformation and its application in natural products will be discussed.
Delivery of Intraocular Triamcinolone Acetonide in the Treatment of Macular Edema
Authors: Pickrell Aaron , Harris Alon , Ngo Sandra , Amireskandari Annahita , Stewart Erin , Siesky Brent
Published: March 2012

Macular edema (ME) is one of the eventual outcomes of various intraocular and systemic pathologies. The pathogenesis for ME is not yet entirely understood; however, some of the common risk factors for its development have been identified. While this investigation will not discuss the numerous etiologies of ME in detail, it appraises the two most widely studied delivery modalities of intraocular corticosteroids in the treatment of ME—intravitreal injection (IVI) and sub-Tenon’s infusion (STI). A thorough review of the medical literature was conducted to identify the efficacy and safety of IVI and STI, specifically for the administration of triamcinolone acetonide (TA), in the setting of ME in an attempt to elucidate a preferred steroid delivery modality for treatment of ME.
Scattering Removal for Finger-Vein Image Restoration
Authors: Yang Jinfeng , Zhang Ben , Shi Yihua
Published: March 2012

Finger-vein recognition has received increased attention recently. However, the finger-vein images are always captured in poor quality. This certainly makes finger-vein feature representation unreliable, and further impairs the accuracy of finger-vein recognition. In this paper, we first give an analysis of the intrinsic factors causing finger-vein image degradation, and then propose a simple but effective image restoration method based on scattering removal. To give a proper description of finger-vein image degradation, a biological optical model (BOM) specific to finger-vein imaging is proposed according to the principle of light propagation in biological tissues. Based on BOM, the light scattering component is sensibly estimated and properly removed for finger-vein image restoration. Finally, experimental results demonstrate that the proposed method is powerful in enhancing the finger-vein image contrast and in improving the finger-vein image matching accuracy.
Simultaneous current, force and dissipation measurements on the Si(111) 7×7 surface with an optimized qPlus AFM/STM technique
Authors: Majzik Zsolt , Setvín Martin , Bettac Andreas , Feltz Albrecht , Cháb Vladimír , Jelínek Pavel
Published: March 2012

We present the results of simultaneous scanning-tunneling and frequency-modulated dynamic atomic force microscopy measurements with a qPlus setup. The qPlus sensor is a purely electrical sensor based on a quartz tuning fork. If both the tunneling current and the force signal are to be measured at the tip, a cross-talk of the tunneling current with the force signal can easily occur. The origin and general features of the capacitive cross-talk will be discussed in detail in this contribution. Furthermore, we describe an experimental setup that improves the level of decoupling between the tunneling-current and the deflection signal. The efficiency of this experimental setup is demonstrated through topography and site-specific force/tunneling-spectroscopy measurements on the Si(111) 7×7 surface. The results show an excellent agreement with previously reported data measured by optical interferometric deflection.
Smoking, Smoking Cessation, and Disease Activity in a Large Cohort of Patients with Rheumatoid Arthritis
Authors: FISHER MARK C. , HOCHBERG MARC C. , EL-TAHA MUHAMMAD , KREMER JOEL M. , PENG CHENG , GREENBERG JEFFREY D. ,   the CORRONA Investigators
Published: March 2012

Objective.

While cigarette smoking is the best-studied environmental factor contributing to rheumatoid arthritis (RA), no study to date has examined the influence of smoking cessation on disease activity. We examined this relationship in an observational cohort of patients with RA in the United States.

Methods.

Patients enrolled in the Consortium of Rheumatology Researchers of North America registry (CORRONA) were stratified into never, former, and current smokers at enrollment. Current smokers were further stratified into continued and ceased smoking groups during their followup in the registry. The primary outcome was change in Clinical Disease Activity Index (CDAI) at last visit in a multivariate, random-effects regression model accounting for multiple timepoints.

Results.

At last visit, there was no significant change in CDAI between ceased smokers and continued smokers (coefficient −0.00091, SE 0.0033, p = 0.7834). The study did confirm prior cross-sectional studies that current smokers have worse disease activity than former or never smokers.

Conclusion.

In the short term, smoking cessation did not appear to influence change in disease activity over time.
Safety and tolerance of Bacteroides xylanisolvens DSM 23964 in healthy adults
Authors: Ulsemer P. , Toutounian K. , Kressel G. , Schmidt J. , Karsten U. , Hahn A. , Goletz S.
Published: March 2012

We recently presented the strain Bacteroides xylanisolvens DSM 23964 to be safe for use in food. In order to confirm the tolerance of healthy humans to a regular oral intake of the strain B. xylanisolvens DSM 23964, we here report on the safety data of two successive human studies: a randomised and double-blind parallel group-controlled pilot study with 41 volunteers receiving a daily dose of a pasteurised fermented milk product containing up to 8.5×1011
B. xylanisolvens DSM 23964 cells for 3 weeks, and a randomised and placebo-controlled double-blind major study with 140 volunteers receiving the same product but spray-dried and containing up to 1012 cells for 6 weeks. In both studies no persistent side effects of any kind were reported. The measured haematological parameters, and the serum concentrations of immunoglobulin and of inflammatory markers (IL-6, CRP, IFN-γ) were unaffected by the supplementation in both studies. A small decrease in the phagocytic activity of granulocytes and a small increase of TNF-α detected in the pilot study were both invalidated by the major study. This study further revealed that the supplementation induced no modification in natural killer cell activity and in liver enzyme values (gamma-glutamyl-transferase, glutamate-oxalacetate transaminase, glutamate-pyruvate transaminase). Our results definitively demonstrate that the pasteurised B. xylanisolvens DSM 23964 strain is safe and well tolerated by healthy human individuals.
Early detection of toxigenic Fusarium graminearum in wheat
Authors: Girotti J.R. , Malbrán I. , Lori G.A. , Juárez M.P.
Published: March 2012

Fusarium graminearum (Schwabe) contaminates agricultural crops and commodities with trichothecenes, mostly deoxynivalenol and its acetyl-derivatives. Current techniques available to detect final mycotoxin contamination products usually require an extended time lag between sampling and the corresponding report, and include different clean-up steps and eventually derivatisation. This study was aimed to develop a methodology to detect toxigenic F. graminearum prior to mycotoxin production. Headspace solid-phase microextraction coupled to capillary gas chromatography is shown to be useful to predict the potential of trichothecene mycotoxin formation by detecting the presence of F. graminearum at early stages of fungal growth in wheat cultivars, based on the detection of trichodiene (TRI), the volatile intermediate of trichothecenes. We showed that TRI is a useful marker to detect toxigenic Fusarium in wheat spikes from live plants, regardless of the actual development of Fusarium head blight (FHB). This is the first predictive methodology for FHB and trichothecene occurrence in field-collected samples. It might be a useful tool to help to prevent the risk of mycotoxin contamination.
Automated Technology to Speed Recognition of Signs of Illness in Older Adults
Authors: Rantz Marilyn J. , Skubic Marjorie , Koopman Richelle J. , Alexander Gregory L. , Phillips Lorraine , Musterman Katy , Back Jessica , Aud Myra A. , Galambos Colleen , Guevara Rainer Dane , Miller Steven J.
Published: March 2012

Our team has developed a technological innovation that detects changes in health status that indicate impending acute illness or exacerbation of chronic illness before usual assessment methods or self-reports of illness. We successfully used this information in a 1-year prospective study to alert health care providers so they could readily assess the situation and initiate early treatment to improve functional independence. Intervention participants showed significant improvements (as compared with the control group) for the Short Physical Performance Battery gait speed score at Quarter 3 (
p
= 0.03), hand grip-left at Quarter 2 (
p
= 0.02), hand grip-right at Quarter 4 (
p
= 0.05), and the GAITRite functional ambulation profile score at Quarter 2 (
p
= 0.05). Technological methods such as these could be widely adopted in older adult housing, long-term care settings, and in private homes where older adults wish to remain independent for as long as possible.
A Comparative Study of Therapy Duration for Survivors of Childhood Sexual Abuse
Authors: Kreidler Maryhelen , Einsporn Richard
Published: March 2012

The goal of this study was to determine whether duration of group therapy affected outcomes for women with a history of childhood sexual abuse (CSA). The sample included women from 6-month therapy groups (
n
= 42) and the comparison group who completed 12 months of therapy (
n
= 114). When outcomes attained by the 6-month group were compared with those of the 12-month group, those in the 6-month group showed significantly greater gains in self-esteem, symptom change, and posttraumatic stress disorder symptoms. In addition, although participants in the 6-month group improved more in depression scores than those in the 12-month group, the difference was not statistically significant. The results of this study indicate that intensive 6-month group therapy for female sur ivors of CSA may be even more beneficial than less intensive 12-month groups.
Mental Health Considerations in Pediatric Enuresis
Authors: Ellington Erin E. , McGuinness Teena M.
Published: March 2012

Enuresis is a common condition during the childhood years. Although distressing to both children and parents, enuresis often goes unreported. Because of its common occurrence, psychiatric nurses should become knowledgeable about enuresis and understand how to assess and treat it when appropriate.
Effect of Limbal Marking Prior to Laser Ablation on the Magnitude of Cyclotorsional Error
Authors: Chen Xiangjun , Stojanovic Aleksandar , Stojanovic Filip , Eidet Jon Roger , Raeder Sten , Øritsland Haakon , Utheim Tor Paaske
Published: March 2012

PURPOSE:

To evaluate the residual registration error after limbal-marking-based manual adjustment in cyclotorsional tracker-controlled laser refractive surgery.

METHODS:

Two hundred eyes undergoing custom surface ablation with the iVIS Suite (iVIS Technologies) were divided into limbal marked (marked) and non-limbal marked (unmarked) groups. Iris registration information was acquired preoperatively from all eyes. Preoperatively, the horizontal axis was recorded in the marked group for use in manual cyclotorsional alignment prior to surgical iris registration. During iris registration, the preoperative iris information was compared to the eye-tracker captured image. The magnitudes of the registration error angle and cyclotorsional movement during the subsequent laser ablation were recorded and analyzed.

RESULTS:

Mean magnitude of registration error angle (absolute value) was 1.82°±1.31° (range: 0.00° to 5.50°) and 2.90°±2.40° (range: 0.00° to 13.50°) for the marked and unmarked groups, respectively (
P
<.001). Mean magnitude of cyclotorsional movement during the laser ablation (absolute value) was 1.15°±1.34° (range: 0.00° to 7.00°) and 0.68°±0.97° (range: 0.00° to 6.00°) for the marked and unmarked groups, respectively (
P
=.005). Forty-six percent and 60% of eyes had registration error >2°, whereas 22% and 20% of eyes had cyclotorsional movement during ablation >2° in the marked and unmarked groups, respectively.

CONCLUSIONS:

Limbal-marking-based manual alignment prior to laser ablation significantly reduced cyclotorsional registration error. However, residual registration misalignment and cyclotorsional movements remained during ablation.
Effect of Simulated IOL Tilt and Decentration on Spherical Aberration After Hyperopic LASIK for Different Intraocular Lenses
Authors: Ruiz-Alcocer Javier , Pérez-Vives Caridad , Madrid-Costa David , López-Gil Norberto , Montés-Micó Robert
Published: March 2012

PURPOSE:

To evaluate visual quality differences among intraocular lenses (IOLs) in patients with previous hyperopic laser ablations and to assess the impact of decentration and tilt of IOLs on visual quality.

METHODS:

An adaptive optics visual simulator was used to simulate the wavefront aberration pattern of one aberration-correcting IOL (AcrySof IQ SN60WF, Alcon Laboratories Inc) and two spherical IOLs with different amounts of positive spherical aberration (Akreos Adapt [Bausch & Lomb] and Triplato [AJL Ophthalmic]) in five situations—centered, 0.2 mm and 0.4 mm of decentration, and 2° and 4° of tilt—in two groups: simulated low hyperopic laser corneal ablation (low hyperopia group) and high hyperopic laser corneal ablation (high hyperopia group). Monocular distance visual acuity at 100%, 50%, and 10% contrast were measured.

RESULTS:

Ten eyes were evaluated. When the IOLs were centered, all IOLs obtained comparable results for the low hyperopia group, whereas for the high hyperopia group, the Akreos Adapt and AcrySof IQ SN60WF showed better visual acuity than the Triplato. When the IOLs were misaligned, for the low hyperopia group, the best visual acuity results were obtained with the Akreos Adapt and the most critical situation was at 0.4 mm of decentration. For the high hyperopia group, misalignments decreased visual acuity in a higher amount than for the low hyperopia group.

CONCLUSIONS:

Our results suggest that the IOLs studied offer good visual quality when they are centered for both groups. However, tilt and decentration of monofocal IOLs have an impact on visual function in patients with hyperopic ablations. For these patients, the Akreos Adapt is the most robust to misalignments.
Aspergillus
Endophthalmitis in One Eye Subsequent to Bilateral Anterior Chamber Phakic Intraocular Lens Implantation
Authors: Jalili Mohammad , Hashemi Hassan , Jabarvand Mahmood , Tabatabai Said Ali
Published: March 2012

PURPOSE:

To present a case of unilateral
Aspergillus
endophthalmitis after bilateral anterior chamber phakic intraocular lens (IOL) implantation in a 26-year-old myopic patient.

METHODS:

Three days after bilateral phakic IOL implantation, the patient presented with complaints of pain and low vision in the left eye and was treated for uveitis. Four weeks later, the patient presented with complaints of pain and decreased vision.

RESULTS:

Culture results of the anterior chamber and IOL specimens were positive for
Aspergillus
. Anterior chamber washing, membrane removal, anterior chamber phakic IOL removal, lensectomy, and anterior vitrectomy along with administration of topical, systemic, and antifungal drugs and intracameral tissue plasminogen activator improved the patient’s corrected distance visual acuity to 20/40 with +6.00 −2.00 × 130°.

CONCLUSIONS:

Although ocular inflammation occurring after IOL implantation responds to corticosteroids, intraocular infections should always be taken into consideration to prevent severe ocular morbidity.
Vidding and the perversity of critical pleasure: Sex, violence, and voyeurism in "Closer" and "On the Prowl"
Authors: Winters Sarah Fiona
Published: March 2012

Analysis of two fan vids ("Closer" by Killa and T. Jonesy, and "On the Prowl" by Sisabet and Sweetestdrain) in the context of theories of vidding reveals that vids have a unique ability to combine analytic detachment and pleasurable investment. I analyze these two vids through Roland Barthes's provocative suggestion that reading criticism demands from the reader a perverse voyeurism of the critic's pleasure in the text to argue that they are examples of the ways in which many vids function as pleasurable criticism that invites viewers of such vids to enter voyeuristically into that pleasure. Both vids use tropes of sexual violence to characterize not only the mass media they respond to, but also the nature of fandom and of transformative fan readings. "On the Prowl" criticizes and celebrates the fan through constructing different audiences for a series of self-portraits; "Closer" does the same thing by constructing Spock as a portrait of the fan. The narratives of sadism and rape constructed by the vids both disturb and seduce the viewer, thus forming perverse texts that that problematize pleasure while simultaneously reinscribing it.
Star Wars franchise, fan edits, and Lucasfilm
Authors: Phillips Forrest
Published: March 2012

Fan edits assert that fan authority is on par with that of a work's original creator; this authority is generated not only through the argument, but through the structure of the text itself. Fan edits adhere to classical filmmaking techniques, creating coherent plots and editing for continuity. These recut texts are emblematic of current ownership debates; they are the read/write culture brought to fandom. The Star Wars series of films are among the most frequently recut texts and are my focus here.
Experimental and Numerical Modeling for Powder Rolling
Authors: Zheng Zhen Xing
Published: March 2012

There are multiple nonlinearities during the course of powder rolling and there is a difficulty for constructing its mechanical model and keeping the stability during the numerical calculation process. In addition, mechanical parameters determined by means of numerical simulation of rolling process are great significance both in theory and practical applications for the optimization of the process parameters and the design and manufacture of rolling equipment. Considering Material and Geometrical Nonlinearity during powder rolling, a constitutive model aiming to the powder rolling is constructed based on the Updated Lagrange (U.L.) formulation by which the basic theory of numerical simulation is deduced. The reasons are analyzed based on the experiments of powder rolling which led to the error during the numerical simulation and the effect of the different factors on powder rolling are analyzed. It is shown that the result of simulation is less than that of experiment and the whole result is dependable. The effect of various process factors is analyzed by the simulation of the rolling process and based on visual analysis of the simulation result, the primary and secondary factors affecting the relative density and the rolling force are obtained.
Improvement in the Transport of Charge Carriers in Tunnel Junctions of Silicon-Based Thin Film Tandem Solar Cells
Authors: Shi Ming Ji , Guo Xin Feng , Wang Sheng Zhao , Chen Lan Li
Published: March 2012

We report new results on a tunneling junction for tandem solar cells using a nano-structured amorphous silicon p+layer (na-Si p+) as the recombination layer inserted between the n layer and the p layer. Devices were characterized by their dark current-voltage behavior (I-V), activation energy (Ea) and quantum efficiency (QE). The result shows that the tunnel junction with a na-Si p+insertion layer has higher recombination rates with higher density of defect states of about 2.7×1019cm-3, lower resistance with activation energy of 22meV. The tunnel junction with a na-Si p+insertion layer could be easily integrated into the tandem solar cell deposition process.
Maximum Reduction in Thickness in a Single Sheet Forming Pass Based on Unified Strength Theory
Authors: Li Xiao Wei , Zhao Jun Hai , Wang Qi Yao
Published: March 2012

Based on unified strength theory, the equation for estimating the maximum reduction in thickness in a single sheet forming pass is obtained. Included the contribution of both intermediate principal shear stress and varying tension-compression-ratio to material mechanical property, the equation developed by this paper can reasonably apply to a wide range of material. It can be proved that the equation for estimating the maximum reduction based on unified strength theory becomes that based on unified yield criterion, when material has equal strength in tension and compression, i.e., the tension-compression-ratio of material is equal to units; and, that the values of the maximum reduction obtained previously based on Mises, or Tresca criterion, are all just special cases of those based on unified yield criterion. In addition, the maximum reduction in thickness for sheet drawing and extrusion is equal to one another.
STEP-NC Code Generator on Drilling Operations Using (GEN-M)
Authors: Yusof Yusri , Zamri Tan Nurul Zakiah
Published: March 2012

STEP-NC is used to transfer machining data between STEP-NC compliant Computer Aided Design (CAD), Computer Aided Manufacturing (CAM) and Computer Numerical Controller (CNC). It overcomes G&M code weakness which has thousand lines of codes but none of them define the machining process. In order to create a complete chain of STEP-NC system to be a new way of producing product in manufacturing environment, a new CNC machine and CAM software that are compliant to STEP-NC has to be developed. Internationally the research and development of STEP-NC has gain many achievement until now, but there is still no commercial STEP-NC system that are fully working in producing variety of features. This research focusing on the software development, named as GEN-M. The software that has been successfully developed are capable to generate code for drilling referring to selected case study from Annex F (Example 1) in ISO 14649 Part 11.
Structural Stability Analysis on 4-Dof Simple Welding Manipulator
Authors: Lv Jun Cheng , Yang Lian Bo
Published: March 2012

The paper discusses the structural stability of 4-dof manipulator, which is suitable for welding spot of three-dimensional space concentrated distribution and approximate single-axis distribution in car body. By using the UG/CAE module, static analysis is applied to the main structure of the manipulator, and the results show that the whole structure meets the design requirement of stiffness and strength.
A Study on Corrosion Resistance and Weatherability of Fluorocarbon Anti-Corrosion Coatings for External Surface of Ocean Platform
Authors: Xie Bei Bei , Han Wen Li , Zhang Yan Jun , Xu Zhong Ping , Yang Yao Hui , Zhang Yi Gang
Published: March 2012

In order to ravel out the problem of serious corrosion and difficult repeated construction on the sea, the fluorocarbon coatings for external surface of ocean platform has been researched. The UV light stability, salt fog resistance, acid and alkali corrosion resistance of fluorocarbon coatings are investigated. The comparison data between fluorocarbon coating and chlorinated rubber coatings, acrylic polyurethane coatings and silicone coatings are given.
Study on Epoxy Coating which Could Be Applied on High Temperature (70°C) Steel Surface
Authors: Xu Zhong Ping , Han Wen Li , Zhang Ying Ying , Xie Bei Bei
Published: March 2012

When common epoxy coatings were applied directly on high temperature (usually about 70°C) steel surface, some defects would occur in coating film, such as bubbles, pinholes, loosen and poor quality flow leveling property, etc. These defects lead to reduction in coating’s adhesion, physical properties and anti-penetrability, shorten service life of coatings greatly, making coating losing their protection function. Main reasons for those defects were analyzed briefly in this paper. In high temperature environment, solvents or other volatile organic compounds (VOC) in coatings will volatilize faster than in normal temperature environment, coating may undergo poor quality flow leveling properties, which couldn’t be fixed by itself. Research and development of a new type epoxy coating were introduced in this paper. Several methods were proposed, including selecting suitable resins, adding high boiling point solvent into coating, using leveling agent and other additives. After these modifications, coating’s construction adaptability was improved and could be applied directly on high temperature steel surface. The scanning electron microscopy (SEM) results show that the coating film prepared in high temperature condition have equivalent fine structure with film prepared in normal condition. The physical properties, anti-penetrability and anti-corrosion were also discussed in this paper
An Investigation into Machining Characteristics of Commercially Pure Titanium (Grade-2) Using CNC WEDM
Authors: Kumar Anish , Kumar Vinod , Kumar Jatinder
Published: March 2012

Titanium is present in the earth’s crust at a level about 0.6% and is therefore the fourth most abundant structural metal after aluminum, iron, and magnesium. High strength, low density, and excellent corrosion resistance are the main properties that make titanium attractive for a variety of applications. The major application of the material is in the aerospace industry, both in airframes,engine components,steam turbine blades, superconductors, missiles etc. or corrosion resistance, for example marine services, chemical, petrochemical, electronics industry, biomedical instruments etc.In this study, wire electrical discharge machining (WEDM) is adopted in machining of commercially pure titanium (Grade-2). During experiments, parameters such as Pulse on time, Pulse off time, Peak current, Spark Gap set Voltage, Wire Feed and Wire Tension were changed to explore their effect on the cutting rate, gap current and surface roughness of the machined specimens. The ranges of process parameters for the experiments were decided on the basis of literature survey and the pilot experiments conducted using one factor at a time approach(OFTA). It is found that the intensity of the process energy does affect the cutting rate, gap current and surface roughness as well as, the wire speed, wire tension and dielectric fluid pressure not seeming to have much of an influence.
A Carbazole-Based Conjugated Polymer Bearing Ruthenium Complexes, Synthesis and Preliminary Photovoltaic Study
Authors: Wang Yan Rong , Zheng Hong Juan , Xu Shen Gang , Li Ya Ping , Cao Shao Kui
Published: March 2012

A carbazole-based conjugated polymer bearing ruthenium complexes Pbpy(Ru)-Cz was synthesized aiming to obtain a material with dual functionalities of both light absorption and hole-transport for photovoltaic cells. Chemical structures of the monomers and polymers were confirmed by ¹H NMR, IR, and elemental analysis. Pbpy(Ru)-Cz showed good thermal stability and solubility. The absorption spectrum of Pbpy(Ru)-Cz showed a broader peak covering the wavelength range from 380 to 650 nm. Preliminary photovoltaic behavior was evaluated by fabricating photovoltaic cells. As measured under a 55 mW cm‾² compact white arc lamp, Voc, Jsc, FF and ηe of the device ITO/Pbpy(Ru)-Cz:PCBM/Al were 0.18 V, 0.019 mA cm‾², 0.22 and 1.40×10‾³%, pectively.
Research and Analysis on Electrolytic Preparation of High Purity Potassium High-Speed Rail Technology
Authors: Sun Dong Mei
Published: March 2012

Ferrate refers to the highest state of iron for + 6 price of the corresponding oxygen acid salt, the oxygen acid salt inherently a performance is very superior strong oxidizer, in modern economic society construction in the process of development, has a good application prospect. Based on the actual situation, with electrolytic method for high purity high iron potassium process as the research object, the high purity high iron potassium structural properties, preparation method, electrochemical method for high purity acid potassium high iron the influence factors of these four aspects to discuss how to use electrolytic method for high purity high iron potassium process more detailed analysis and explained, and then demonstrates the power needed to prepare high purity in high iron potassium process preparation is more superior than other ways of performance.
A Novel Peak-Seek Algorithm Used in FBG Sensor Demodulation System for Vibration Monitoring
Authors: Cai Lin Jun , Li Zheng Ying , Tang Zhi Hao , Meng Wei , Liu Quan
Published: March 2012

The FBG sensor technologies used for real-time monitoring of the mechanical vibration have attracted more and more concerns from both academic and industrial domains. In practical applications, the vibration frequency of the equipments generally reach up to a few hundred to several thousand Hz, however, the existing FBG demodulator is incompetent to meet the actual requirements of vibration monitoring in terms of demodulation speed and algorithm structures. To solve this problem while achieving a higher accuracy at a relatively lower computation cost, a novel adaptive semi-peak-seek algorithm based on state machine is proposed, which can be divided into three parts including data collection, data analysis and data verification. The experiment result shows that for the demodulation speed of 2 KHz, we can reach a demodulation accuracy of 1pm and a static noise within ±2pm. On the basis of a long term test, the stability error that less than 2pm and the system dynamic range of 0~ -30db are concluded, and the measurement error with the optical power attenuation is limited to 4pm. Thus, the proposed algorithm is capable to meet the requirements of high-speed demodulation devices in terms of speed, precision, stability and anti-interference properties.
The Research of Integration Technology of Heterogeneous Data Sources on Campus
Authors: Liang Xiao Xiao
Published: March 2012

With the deeply development of campus information technology, it needs to store and manage vast amounts of information. However, the information is often stored in different structures of information systems, how to achieve the integration of heterogeneous data sources is the problem to be solved in university information system. In this article, the most commonly used integration technology of heterogeneous data sources is described, and then data source integration patterns which could be used in campus are studied, the design of XML-based integration of heterogeneous data sources and some key technology are in-depth studied.
Rain-Wind-Induced Vibration Control for Long Span Transmission Tower
Authors: Tian Li , Jin Shu , Wang Zi Long
Published: March 2012

In this paper, multiple tuned liquid dampers control for rain-wind-induced response of long span transmission tower is investigated. Equations of motion for a structure-TLD system are derived. According to the mechanism of vibration control, rain-wind-induced vibration control for tower model with multiple tuned liquid dampers is carried out by using numerical simulation. Three-dimensional finite element model of tower based on a real project is established. Rain-wind load time history is simulated based on wind and rain theory. Time history curves and the maximum responses without and with tuned liquid damper under rain-wind excitation are analyzed and discussed. The results show that the tuned liquid damper could decrease the rain-wind-induced response of long span transmission tower, and the device could be installed in tower when the response too large.
Analysis on Buckling Restrained Brace Used for a Steel Structure Damping
Authors: Wang Peng
Published: March 2012

SAP2000 was established in a high-rise steel structure buildings numerical analysis model, through the added a full steel support and common support the buckling and structure under earthquake effect of dynamic response analysis, the key research and support for the structure seismic buckling influence on the performance of the, the analysis results show that add fortify buckling support the energy dissipation structure performance than pure frame structure and common support-frame structure.Introduction.
Analysis of Nonlinear Seismic Response and Stability for Tunnel Portal Slope
Authors: Li Y.S. , Li T.B.
Published: March 2012

The nonlinear seismic response of transverse slope at secund tunnel portal is first studied with dynamic finite element method under conditions of horizontal, vertical and both horizontal and vertical input, and then the dynamic safety factors of the most dangerous slide face which vary with time are researched after adding the field of static stress. For the purpose of dynamic stability evaluation, the total average dynamic safety factor and the permanent displacement are bring forward and used in this paper. At last, the model of dynamic response analysis and stability evaluation is built for transverse slope at secund tunnel portal.
Vibration Analysis of a Stepped Beam by Using Adomian Decomposition Method
Authors: Mao Qi Bo , Nie Yan Ping , Zhang Wei
Published: March 2012

The free vibrations of a stepped Euler-Bernoulli beam are investigated by using the Adomian decomposition method (ADM). The stepped beam consists two uniform sections and each section is considered a substructure which can be modeled using ADM. By using boundary condition and continuity condition equations, the dimensionless natural frequencies and corresponding mode shapes can be easily obtained simultaneously. The computed results for different boundary conditions are presented. Comparing the results using ADM to those given in the literature, excellent agreement is achieved.
Application of SVM in Predicting the Strength of Cement Stabilized Soil
Authors: Shi Xu Chao , Liu Qi Xia , Lv Xiu Juan
Published: March 2012

Support Vector Machine is a powerful machine learning technique based on statistical learning theory. This paper investigates the potential of support vector machines based regression approach to model the strength of cement stabilized soil from test dates. Support Vector Machine model is proposed to predict compressive strength of cement stabilized soil. And the effects of selecting kernel function on Support Vector Machine modeling are also analyzed. The results show that the Support Vector Machine is more precise in measuring the strength of cement than traditional methods. The Support Vector Machine method has advantages in its simple structure，excellent capability in studying and good application prospects, also it provide us with a novel method of measuring the strength of cement stabilized soil.
Online Test Technology for Reversible Circuits
Authors: Hu Jing , Wen Dian Zhong
Published: March 2012

A new technique is presented for online test with some garbage lines in reversible circuits. Firstly, testable structures for reversible logic are given. Then, a scan-D Flip-Flops for constructing scan-chains is provided. Using the new scan-D Flip-Flops, test programs for reversible circuits were analyzed. The proposed method was tested on a set of reversible benchmarks. It realized online test.
Simulated High-Pile Dock Construction on the Impact of Coastal Erosion Based on Theoretical Models and Dou Theory - A Case of Suanshan Dock
Authors: Luo De Yu , Huang Lei , Gao Xu
Published: March 2012

In order to investigate the renovation and expansion of coastal high-pile on the possible environmental impact of erosion and deposition, the changes of ocean current field and bottom erosion before and after the current field of renovation and expansion were simulated in use of an average two-dimensional vertical flow theoretical simulation model and Dou theory, based on ocean current Speed, flow and other measured data, integrated hydrological, meteorological and other historical information. The results showed that after the construction of Suanshan Dock , the increased siltation of Yang gong-shan Dock and Budui Dock code were approximately 1m and 0.5m respectively. Due to the high pile and bridge-type structure of high-pile dock , although the construction of Suanshan Dock would cause coastal area occurring a certain flow pattern changes , there were not significantly changes to the topography of basin . The underwater slope area would remain in a relatively stable state.
Particle Size Dependent Structural and Magnetic Properties of CoCrFeO4 Nanoparticles
Authors: Dhanraj R. Mane , Ram H. Kadam , Suresh T. Alone , Sagar E. Shirsath
Published: March 2012

Nanoparticles of CoCrFeO4ferrite in the particle size range of 9 - 38 nm have been prepared by a sol-gel auto combustion method. Synthesized powders were annealed at four different temperatures viz. 400 °C, 600 °C, 800 °C and 1000 °C. Particle sizes are determined by X-ray analysis and TEM. The size of the nanoparticles increase linearly with sintering temperature and time, most probably due to coalescence that increases as sintering temperature increases. The saturation magnetization increases from 62 to 81 emu/g and coercivity initially increases up to 814 Oe and then decreases to 366 Oe with increase in particle size and sintering temperature. The typical blocking temperature increases from 135 to 165 K with increasing particle size.
The Role of Grain Size in Response of SnO2- and In2O3-Based Conductometric Gas Sensors
Authors: Korotcenkov Ghenadii , Cho Beong Ki , Brinzari V.
Published: March 2012

Basing on the experimental results, obtained while studying both structural and gas sensing properties of the SnO2 and In2O3 films deposited by spray pyrolysis method, it was analyzed the influence of the crystallites size on the response of the SnO2-and In2O3-based thin film gas sensors. It was confirmed that that the grain size is one of the most important parameters of metal oxides, controlling almost all operating characteristics of the solid state gas sensors. However, it was shown that the decrease of the grain size is not a universal decision contributing to the improvement of sensor response. The decrease of the grain size could be accompanied either by the improvement, or the worsening of gas sensor operating characteristics.
Preparation of Co3O4-Activated Carbon Fiber by Electrospinning and its Performance of Adsorbing Low Concentration SO2
Authors: Wu Yan Bo , Sun Peng , Lou Ting , Song Tie Ben
Published: March 2012

The poly (vinyl pyrrolidone) (PVP)/Cobalt Acetate Composite nanofibers were prepared by electrospinning method. Then we got Co3O4-activated carbon fiber (ACF) from PVP/Cobalt Acetate composite nanofibers after preoxidation, carbonation and activation. Study the effect of different adsorption conditions on the adsorption rate of low concentration SO2. The SEM, TG-DTA, XRD, FT-IR and BET analysis methods is used to characterize. The results show that the specific surface area of Co3O4-ACF obtained reach 1238.5 m2/g, and it contains Co3O4 after carbonation. The adsorption rate can reach 69.0%, when the concentration of SO2 is 1.0 μg/mL, adsorption temperature is 20, and adsorption time is 10 minimum.
Photocatalytic Hydrogen Evolution over Cr3+Doped Porous CdIn2S4 Photocatalysts under Visible Light Irradiation
Authors: Bai Xue Feng , Li Jin Shu
Published: March 2012

A series of Cr3+doped porous CdIn2S4photocatalysts with good optical property were synthesized via a facile hydrothermal process using sodium dodecyl sulfate (SDS) as template. The above-prepared photocatalysts were characterized by XRD, field emission scanning electron microscopy (FESEM), UV-Vis diffusive reflectance spectroscopy (DRS) and XPS. The influences of Cr3+doping concentration on the morphology and photocatalytic activity of CdIn2S4photocatalysts were investigated. The results demonstrated that the presence of Cr3+doping in the CdIn2S4photocatalyst had significantly influence on the crystal structure, micro-morphology, e--h+recombination and photocatalytic activity. The photocatalytic hydrogen evolution of CdIn2S4was enhanced by doping, and the highest rate of hydrogen evolution of 758.8 μmol/(h·g) over Cr3+(0.5%)-CdIn2S4was observed.