bluuebunny/crossref_metadata_2025 huggingface dataset:
Coronary Angiographic Severity in Patients With Raised Plasma Homocysteine Level
Authors: Kabir MS , Majumder AAs , Bari MS , Chowdhury AW , Islam AM
Published: August 2011

Background: Besides conventional classic risk factors of ischaemic heart disease other variables that have come under scrutiny for their potential contribution include estrogen deficiency, lipoprotein (a), plasma fibrinogen, plasminogen-activator inhibitor type I, endogenous tissue plasminogen activator (tPA), C-reactive protein and homocysteine. A number of studies have been undertaken worldwide shows strong correlation of raised fasting plasma homocysteine level with the development of atherosclerotic vascular diseases, myocardial infarction or increasing severity of coronary artery diseases. Objective: To find out the correlation of fasting plama homocysteine level with the severity of coronary artery disease in our population. Method: We undertook a study involving 100 patients of ischaemic heart disease (determined clinically & by non-invasive tests) in National Institute of Cardiovascular Diseases, Dhaka, Bangladesh, over the period of one year from January 2003 to December 2003. Out of 100 patients, 50 patients having normal homocysteine level were considered as control and another 50 patients having raised plasma homocysteine level were taken as cases. Result: Out of 50 patients, 20% had single vessel disease, 48% had double vessel disease and 32% had 3 vessel diseases. On the other hand in control group 10% patients had normal coronary artery disease, 40% had single vessel disease, 32% had double vessel disease and 18% had triple vessel disease. Conclusion: The study showed significant increase in number of coronary artery involvement by atherosclerotic lesions with increasing levels of plasma homocysteine level. Key words: Homocysteine; Coronary artery disease; Coronary angiogram. DOI: http://dx.doi.org/10.3329/cardio.v1i2.8124 Cardiovasc. j. 2009; 1(2) : 169-173
Management of Saphena Varix: A rare case in Surgical Practice
Authors: Bhuiyan MBG , Fahim EH , Sadik BA , Hasan MM , Hakim E , Ahsan NAK
Published: August 2011

DOI: http://dx.doi.org/10.3329/cardio.v1i2.8177 Cardiovasc. j. 2009; 1(2) : 229-230
Current Perspectives on Desmoid Tumors: The Mayo Clinic Approach
Authors: Joglekar Siddharth B. , Rose Peter S. , Sim Franklin , Okuno Scott , Petersen Ivy
Published: August 2011

Desmoid tumors are a rare group of locally aggressive, non malignant tumors of fibroblastic origin that can lead to significant morbidity due to local invasion. Despite advances in the understanding of these tumors, their natural history is incompletely understood and the optimal treatment is still a matter of debate. Local control is the main goal of treatment and there has been a change in philosophy regarding the management of these tumors from aggressive surgical resection to function preservation. A multidisciplinary approach is essential to plan local control with acceptable morbidity. The current Mayo Clinic algorithm for the treatment of these tumors is based on institutional experience and the available evidence in the literature: asymptomatic/non progressive lesions away from vital structures are managed with observation and regular imaging; primary or recurrent desmoid tumors which are symptomatic or progressive or near vital structures are managed with wide surgical resection when wide surgical margins are possible with minimal functional and cosmetic loss. When positive or close surgical margins are likely, surgical resection with adjuvant radiotherapy or definitive radiotherapy is preferred. If likely functional or cosmetic deficit is unacceptable, radiotherapy is the treatment of choice. Unresectable lesions are considered for radiotherapy, chemotherapy or newer modalities however an unresectable lesion associated with a painful, functionless, infected extremity is managed with an amputation.
E-Learning in Pharmacology and Pharmacy
Authors: Efferth Thomas
Published: August 2011

Computer-based learning facilitates a shift from externally controlled to self-directed learning. Universities and other educational institutions are challenged by these developments and must react appropriately to meet the requirements of education. The term e-learning has been coined to describe a wide range of diverse learning and teaching strategies based on the use of electronic devices. Recently developed concepts in the science of education and learning provide appropriate frameworks for novel e-learning scenarios. The present review introduces strategies and concepts for the implementation of e-learning in academic and non-academic programs and gives an overview of current e-learning activities in pharmacology.
Introducing Intensively Managed Spruce Plantations in Swedish Forest Landscapes will Impair Biodiversity Decline
Authors: Strengbom Joachim , Dahlberg Anders , Larsson Artur , Lindelöw Åke , Sandström Jonas , Widenfalk Olof , Gustafsson Lena
Published: August 2011

Due to pressure to raise forest productivity in Sweden, there are proposals to apply more intensive forestry methods, but they could have potentially large effects on biodiversity. Here we report a compilation and evaluation of the extent and significance of such effects. We evaluated potential effects on biodiversity by introducing intensively fertilized Norway spruce plantations as a management option in Swedish forests with low conservation values on insects, vascular plants, lichens, bryophytes, and red-listed species. Due to a lack of specific studies addressing this question, we based the evaluation on a combination of available and appropriate empiric and anecdotic knowledge; literature data, and expert judgments largely available in species data bases. Our evaluations suggest that such forests will only harbor species that are common and widespread in conventionally managed stands and that species of conservation interest will be lacking, due to the low heterogeneity and light intensity of even-aged monocultures with dense canopies, short rotation times and low availability of coarse woody debris. Effects at the landscape scale are more difficult to evaluate, but will be dependent on the area utilized and the conservation value of sites used. We conclude that negative effects on biodiversity can be reduced if: (1) only land with the lowest conservational value is utilized; (2) plantations are spatially arranged to minimize fragmentation of the landscape; (3) the quality and quantity of key structural elements (e.g., coarse woody debris, old living trees and snags) are maintained at the landscape level; and (4) management intensity is relaxed on other land. For effective implementation of these measures, legislative frameworks and policy instruments need to be adjusted and new models for planning and monitoring need to be developed.
Potential Antibacterial Activity of Carvacrol-Loaded Poly(DL-lactide-co-glycolide) (PLGA) Nanoparticles against Microbial Biofilm
Authors: Iannitelli Antonio , Grande Rossella , Stefano Antonio Di , Giulio Mara Di , Sozio Piera , Bessa Lucinda Janete , Laserra Sara , Paolini Cecilia , Protasi Feliciano , Cellini Luigina
Published: August 2011

The ability to form biofilms contributes significantly to the pathogenesis of many microbial infections, including a variety of ocular diseases often associated with the biofilm formation on foreign materials. Carvacrol (Car.) is an important component of essential oils and recently has attracted much attention pursuant to its ability to promote microbial biofilm disruption. In the present study Car. has been encapsulated in poly(DL-lactide-co-glycolide (PLGA) nanocapsules in order to obtain a suitable drug delivery system that could represent a starting point for developing new therapeutic strategies against biofilm-associated infections, such as improving the drug effect by associating an antimicrobial agent with a biofilm viscoelasticity modifier.
A Pilot Study of the Association of Tumor Necrosis Factor Alpha Polymorphisms with Psoriatic Arthritis in the Romanian Population
Authors: Popa Olivia M. , Bojinca Mihai , Bojinca Violeta , Dutescu Monica I. , Meirosu Mihaela , Caisan Ruxandra E. , Ciofu Claudia , Bara Constantin , Popa Luis O.
Published: August 2011

Tumor necrosis factor alpha (TNF-alpha) is an important pro-inflammatory cytokine implicated in the pathogenesis of psoriatic arthritis. We have performed a case-control association study of three TNF-alpha gene polymorphisms in a group of Romanian psoriatic arthritis patients versus ethnically matched controls. A second group of patients with undifferentiated spondyloarthritis was used in order to look for similarities in the genetic background of the two rheumatic disorders. The −857C/T polymorphism was associated with susceptibility to psoriatic arthritis in our population at the individual level (p = 0.03, OR 1.65, 95% CI 1.05–2.57) and in combined haplotypes with the −238G/A and −308G/A SNPs. Regarding the investigated polymorphisms and derived haplotypes, no potential association was found with the susceptibility to undifferentiated spondyloarthritis in Romanian patients.
Proanthocyanidins from Grape Seeds Modulate the NF-κB Signal Transduction Pathways in Rats with TNBS-Induced Ulcerative Colitis
Authors: Li Xiaoli , Yang Xiaolai , Cai Yongqing , Qin Hong , Wang Li , Wang Yanhong , Huang Yanhui , Wang Xiaoxia , Yan Shuai , Wang Liping , Zhao Xin , Li Wan , Li Sijia , Chen Jiajia , Wu Yongjie
Published: August 2011

To elucidate the molecular mechanisms involved in the therapeutic effects of proanthocyanidins from grape seeds (GSPE), we explore whether GSPE regulates the inflammatory response of TNBS-induced colitis in rats at the levels of NF-κB signal transduction pathway. Rats were intragastrically administered of different doses of GSPE (100, 200 and 400 mg·kg−1) per day for seven days after ulcerative colitis (UC) was induced by intracolonic injection of 2,4,6-trinitrobenzenesulfonic acid (TNBS) dissolved in 50% ethanol. Sulfasalazine (SASP) at 400 mg/kg was used as a positive control drug. The expression of nuclear factor-kappa B (NF-κB), phospho-I kappaB-alpha (pIκBα), inhibitor kappa B kinase (IκK) in the colon tissues were all measured by enzyme-linked immunosorbent assay (ELISA) methods. Treatment with GSPE reduced the expression of NF-κB, pIκBα and IκK in the colon. The results of this study show that GSPE exerts beneficial effects in inflammatory bowel disease by inhibition of NF-κB signal transduction pathways.
Parthenolide Induces Apoptosis and Cell Cycle Arrest of Human 5637 Bladder Cancer Cells In Vitro
Authors: Cheng Guang , Xie Liping
Published: August 2011

Parthenolide, the principal component of sesquiterpene lactones present in medical plants such as feverfew (Tanacetum parthenium), has been reported to have anti-tumor activity. In this study, we evaluated the therapeutic potential of parthenolide against bladder cancer and its mechanism of action. Treatment of bladder cancer cells with parthenolide resulted in a significant decrease in cell viability. Parthenolide induced apoptosis through the modulation of Bcl-2 family proteins and poly (ADP-ribose) polymerase degradation. Treatment with parthenolide led to G1 phase cell cycle arrest in 5637 cells by modulation of cyclin D1 and phosphorylated cyclin-dependent kinase 2. Parthenolide also inhibited the invasive ability of bladder cancer cells. These findings suggest that parthenolide could be a novel therapeutic agent for treatment of bladder cancer.
A Single-Walled Carbon Nanotube Network Gas Sensing Device
Authors: Wang Li-Chun , Tang Kea-Tiong , Teng I-Ju , Kuo Cheng-Tzu , Ho Cheng-Long , Kuo Han-Wen , Su Tseng-Hsiung , Yang Shang-Ren , Shi Gia-Nan , Chang Chang-Ping
Published: August 2011

The goal of this research was to develop a chemical gas sensing device based on single-walled carbon nanotube (SWCNT) networks. The SWCNT networks are synthesized on Al2O3-deposted SiO2/Si substrates with 10 nm-thick Fe as the catalyst precursor layer using microwave plasma chemical vapor deposition (MPCVD). The development of interconnected SWCNT networks can be exploited to recognize the identities of different chemical gases by the strength of their particular surface adsorptive and desorptive responses to various types of chemical vapors. The physical responses on the surface of the SWCNT networks cause superficial changes in the electric charge that can be converted into electronic signals for identification. In this study, we tested NO2 and NH3 vapors at ppm levels at room temperature with our self-made gas sensing device, which was able to obtain responses to sensitivity changes with a concentration of 10 ppm for NO2 and 24 ppm for NH3.
Smart Learning Services Based on Smart Cloud Computing
Authors: Kim Svetlana , Song Su-Mi , Yoon Yong-Ik
Published: August 2011

Context-aware technologies can make e-learning services smarter and more efficient since context-aware services are based on the user’s behavior. To add those technologies into existing e-learning services, a service architecture model is needed to transform the existing e-learning environment, which is situation-aware, into the environment that understands context as well. The context-awareness in e-learning may include the awareness of user profile and terminal context. In this paper, we propose a new notion of service that provides context-awareness to smart learning content in a cloud computing environment. We suggest the elastic four smarts (E4S)—smart pull, smart prospect, smart content, and smart push—concept to the cloud services so smart learning services are possible. The E4S focuses on meeting the users’ needs by collecting and analyzing users’ behavior, prospecting future services, building corresponding contents, and delivering the contents through cloud computing environment. Users’ behavior can be collected through mobile devices such as smart phones that have built-in sensors. As results, the proposed smart e-learning model in cloud computing environment provides personalized and customized learning services to its users.
Triple-Negative Breast Cancers: An Updated Review on Treatment Options
Authors: Reddy K.B.
Published: August 2011

Morphologic features of tumour cells have long been validated for the clinical classification of breast cancers and are regularly used as a “gold standard” to ascertain prognostic outcome in patients. Identification of molecular markers such as expression of the receptors for estrogen (er) and progesterone (pgr) and the human epidermal growth factor receptor 2 (her2) has played an important role in determining targets for the development of efficacious drugs for treatment and has also offered additional predictive value for the therapeutic assessment of patients with breast cancer. More recent technical advancements in identifying several cancer-related genes have provided further opportunities to identify specific subtypes of breast cancer. Among the subtypes, tumours with triple-negative cells are identified using specific staining procedures for basal markers such as cytokeratin 5 and 6 and the absence of er, pgr, and her2 expression. Patients with triple-negative breast cancers therefore have the disadvantage of not benefiting from currently available receptor-targeted systemic therapy. Optimal conditions for the therapeutic assessment of women with triple-negative breast tumours and for the management of their disease have yet to be validated in prospective investigations. The present review discusses the differences between triple-negative breast tumours and basal-like breast tumours and also the role of mutations in the BRCA genes. Attention is also paid to treatment options available to patients with triple-negative breast tumours.
Canadian Expert Group Consensus Recommendations: KRAS Testing in Colorectal Cancer
Authors: Aubin F. , Gill S. , Burkes R. , Colwell B. , Kamel–Reid S. , Koski S. , Pollett A. , Samson B. , Tehfe M. , Wong R. , Young S. , Soulières D.
Published: August 2011

Monoclonal antibodies against the epidermal growth factor receptor (anti-egfr) when used in the treatment of metastatic colorectal cancer are associated with improved survival. Patients whose tumours harbor a KRAS mutation in codon 12 or 13 have been shown not to benefit from anti-egfr antibodies. The importance of KRAS mutation status in the management of patients with metastatic colorectal cancer has led to the elaboration of Canadian consensus recommendations on KRAS testing, with the aim of standardizing practice across Canada and reconciling testing access with the clinical demand for testing. The present guidelines were developed at a Canadian consensus meeting held in Montreal in April 2010. The best available evidence and expertise were used to develop recommendations for various aspects of KRAS testing, including indications and timing for testing, sample requirements, recommendations for reporting requirements, and acceptable turnaround times.
Risk of HBV Reactivation According to Viral Status and Treatment Intensity in Patients with Hepatocellular Carcinoma
Authors: Jang Jeong Won , Kwon Jung Hyun , You Chan Ran , Kim Jin Dong , Woo Hyun Young , Bae Si Hyun , Choi Jong Young , Yoon Seung Kew , Chung Kyu Won
Published: August 2011

Background

There are no convincing data supporting the routine use of pre-emptive therapy against HBV reactivation in various loco-regional therapies for hepatocellular carcinoma (HCC). This study investigated the incidence, severity and risk factors of HBV reactivation during loco-regional therapies.

Methods

A total of 205 prospectively enrolled patients were classified in order of increasing intensity of loco-regional therapies: local ablation therapy (LAT; 43 patients), transarterial chemotherapy using adriamycin (TAC-ADR; 93 patients) or combined epirubicin-cisplatin (TAC-EC; 26 patients), and combined chemo-radiotherapy (TAC-EC+RT; 43 patients).

Results

During the follow-up, 62 (30.2%) patients developed HBV reactivation. Multivariate analysis identified HBV DNA levels >104 copies/ml ( P=0.041) and treatment option ( P=0.001) to be independent predictors of HBV reactivation. There was a significant trend for increasing risk of reactivation with increasing intensity of therapy, with hazard ratios of 1.0 for LAT, 2.45 for TAC-ADR, 4.19 for TAC-EC and 10.17 for TAC-EC+RT. The severity of reactivated disease was also increased with increasing treatment intensity ( P-value for trend <0.05). Only one of the patients with low-level viraemia receiving LAT alone developed reactivation, whereas a substantial number of patients with high-level viraemia eventually developed reactivation.

Conclusions

High-level viraemia and high-level treatment intensity are the major risk factors for HBV reactivation during loco-regional therapy. Trends are evident for the increased risk and severity of reactivation with the aggressiveness of treatment. Pre-emptive antiviral therapy should be recommended for all patients with high-level viraemia irrespective of treatment option, or those undergoing any intensive therapy.
La convention du conseil de l'Europe sur l'accès aux documents publics : premier traité consacrant un droit général d'accès aux documents administratifs
Authors: Edel Frédéric
Published: August 2011

La Convention du Conseil de l’Europe sur l’accès aux documents publics est le premier traité international consacrant un droit général d’accès aux documents administratifs. Cette convention comble une lacune à l’échelle internationale et européenne en la matière, car la reconnaissance internationale du droit d’accès aux documents administratifs était jusqu’alors limitée, soit quant à sa portée, soit quant à son effectivité. Garantie par un système de contrôle non contentieux, la Convention consacre un droit d’accès général, sur le modèle d’un droit subjectif fondamental. Elle met en place, d’un côté, des dispositions obligatoires formant un standard minimum européen du droit d’accès et, de l’autre, des dispositions facultatives permettant aux États qui le souhaitent d’élargir la protection.
Le droit à une bonne administration dans la charte des droits fondamentaux de l'Union européenne
Authors: Jacqué Jean-Paul
Published: August 2011

L’inscription du droit à une bonne administration dans la Charte des droits fondamentaux de l’Union européenne est le résultat d’un mouvement préparé de longue date. Elle a nécessité une clarification des titulaires et des créanciers du droit ainsi que, surtout, de son contenu. Elle constitue ainsi le point d’ancrage d’un processus qui, avec l’aide de la Cour, conduira à une amplification du standard exigé et notamment le franchissement d’une nouvelle étape de la démocratie administrative à travers ce qu’on appelle le « mieux légiférer ».
Less is more ? Les propositions de la commission sur l'accès aux documents de l'Union européenne
Authors: Maiani Francesco , Villeneuve Jean-Patrick , Pasquier Martial
Published: August 2011

— Less is more ? The Commission’s proposals on access to European Union document — Transparency is widely regarded as a key toll of democratic governance. The future of citizens’right of access to EU documents is currently being debated following the Commission’s proposal to reform current rules. This article describes the main features of the current system and assesses whether the proposed changes are appropriate, in light of major trends observed at international level regarding the modernisation of legislation on information and the debates on the proper limits of transparency.
Le rôle de la commission d'accès aux documents administratifs
Authors: Leclerc Jean-Pierre
Published: August 2011

L’auteur dresse un bilan des principales avancées qui ont caractérisées l’activité de la Commission d’accès aux documents administratifs, autorité administrative indépendante qui est depuis plus de trente ans la pierre angulaire de la transparence administrative en France. Sont successivement envisagées, la question l’accès aux documents administratifs, qui est aujourd’hui arrivée à l’âge de la maturité, et celle plus récente de la réutilisation des informations publiques, qui est appelée à se développer compte tenu de l’importance de ce secteur et des perspectives économiques qu’il ouvre.
Écouter les usagers : de la simplification à l'innovation
Authors: Waintrop Françoise
Published: August 2011

La simplification administrative est un exercice déjà ancien, qui a été l’enjeu de nombreuses commissions dont le bilan est mitigé. Dans ces structures, la concertation existait, incarnée par la participation d’associations ou de personnalités « qualifiées ». Mais pour obtenir des résultats tangibles, ne faut-il pas partir de la vie quotidienne des usagers ? Cela soulève des questions de méthodologie sur la façon de mesurer les attentes des usagers, d’organiser la concertation avec leurs associations, de prendre en compte les innovations, de les intégrer dans les process administratifs, qui restent des sujets inexplorés. Cette vision très opérationnelle de la relation à l’usager pose aussi la question de l’organisation des administrations, de ce que doit être la performance administrative et de sa mesure en partant des attentes des usagers. Elle remet en cause les bases actuelles du management et des objectifs assignés aux cadres supérieurs. Il ne s’agit pas uniquement de simplifier les démarches administratives mais bien la vie des citoyens en améliorant la qualité de service et les valeurs de l’administration de manière pérenne.
De l'administration démocratique à la démocratie administrative
Authors: Chevallier Jacques
Published: August 2011

Si la question de la relation entre « démocratie » et « administration » est une question récurrente, elle est désormais pensée en termes nouveaux : alors qu’il s’agissait traditionnellement de savoir dans quelle mesure et à quelles conditions l’administration était conforme à l’idéal démocratique, donc « démocratique », celle-ci tend à être conçue comme le support et le vecteur d’une démocratie rénovée : la promotion du thème de la « démocratie administrative » traduit bien ce basculement. Impliquant la consécration de droits nouveaux en faveur des administrés, la démocratie administrative entend aussi à les associer aux processus administratifs, dans le cadre de mécanismes de délibération et de participation. Bien qu’elle ne soit pas dénuée d’importance, cette inflexion n’entraîne pas pour autant la promotion d’un modèle administratif radicalement nouveau.
Thermodynamic-Based Modified Cam-Clay Constitutive Model Considering the Effect of Fabric
Authors: Guo Xiao Xia , Zhao Bo Ya
Published: August 2011

In order to construct a constitutive model taking into the effect of both the fabric tensors and their evolution modes, this paper links modern ideas of thermomechanics opinion to the theory of fabric tensors. The anisotropic dissipation incremental function of modified Cam-clay constitutive model considering the effect of fabric characteristic can be obtained by establishing the relation between microstructure and plastic volume strain. After discussing the yield surfaces in the dissipative and the true stress space from the viewpoint of the evolution mode of the fabric tensors, the results indicate that the slope of the normal consolidation line and the critical state line will be governed by changes of void fabric. The model successfully captures most salient behaviors of granular materials related to fabric issues. In the dissipative stress space, the void of granular materials can rearrange and show more anisotropic. In the true stress space, fabric not only affects the deflection of the yield surface, but also affects the hardening rule.
Analyses of Immaterial Characters of Materials
Authors: Wei Xiang
Published: August 2011

This paper firstly analyzes the relationship between materials and product design, then discusses the “materiality” and “immateriality” in product design and put forward the concept of “immateriality” of materials, and then studies them. As a result it is put forward that immaterial characters of materials have important effect on the material selection in product design.
Adsorption Properties of Dyeing Wastewater on 8-Hydroxyquinoline Modified Bentonite
Authors: Shao Hong , Cao Ning , Xiao Hong Kang
Published: August 2011

A novel adsorption material was synthesized and characterized by the methods of X-ray diffraction and scanning electron microscopy. The optimum reaction conditions of the 8-hydroxyquinoline modified bentonites were studied. And the modified bentonite was applied into the treatment of dyeing wastewater. The decoloration rate was invested as index. The effects of pH, adsorbent dosage, stirring speed, sedimentation time on adsorption have also been studied. The result showed that the decoloration rate of direct light turquoise blue dye on modified bentonites reached 94.12%, and the decoloration rate of acid orange dyeing wastewater reached 74.46%. So this type of modified bentonite was suitable for the treatment of dyeing wastewater.
Effect of Particle Characteristic on Cooling Process of High Temperature Sinter
Authors: Lou Guo Feng , Wen Zhi , Liu Xun Xiang , Zhang Xin , Zheng Kun Chan
Published: August 2011

In the paper, a 1-D unsteady mathematical model is used to analyze the cooling process of high temperature sinter. The modeling result is compared with measured data, and the agreement is good. The effect of sinter particle size and void fraction on the cooling process of the annular cooler has been investigated.
The Study of the Single Column Special-Shaped Bridge’s Calculation and Key Detected Technologies
Authors: Sun Quan Sheng , Wang Jia Wei
Published: August 2011

Single Column shaped bridge is often used as a city program, it has the separate grade crossing, and multi-entry multi-exit, and greater clearance under the bridge, etc. But its stress situation is more complex, for designers and construction workers, put forward higher requirements. This article embarks from the stress of single Column shaped bridge, comparative analysis shaped bridge and curved bridge, concreting continuous beam bridge differences and similarities, and proposes the support way to the heterogeneous bridge's influence. Based on the single column bridge study, we find a simplified method on modeling, and its accuracy is in line with requirements of project. Finally, analyzes of the actual bridge, verifies the correctness of the calculation method, and proposes the key technologies.
The Quantitative Evaluation Model of Wall Building Material’s Environment Impact
Authors: Gong Ping
Published: August 2011

Based on the life cycle evaluation system and Fuzzy Mathematics Hierarchy Process,analysted the factors which influenced environment on wall building material full life,establishedall factor’s hierarchy structure,calculated each factor’s weight,constructed a wall building material’s quantitative environment impact degree evaluation model.
The Mechanical Properties of Foam Asphalt Mixture
Authors: Du Shao Wen , Xu Wei , Li Shan Shan
Published: August 2011

The mechanical properties of foam asphalt mixture are investigated, including indirect tensile strength (ITS), moisture resistance, rutting resistance and fatigue resistance. The test results indicate the 40°C3d curing mehod can stimulate the 30d or 60d natural environment temperature (25°C) curing procedures, which can quickly evaluate the long term ITS of foam asphalt mixture with cement or without cement. Cement can obviously improve the ITS, moisture resistance and fatigue test. The paper recommends proper cement content of foam asphalt mixture should be in between 1.5% to 2.5%.
Research of Foam Phosphogypsum with Low Bulk Density
Authors: Yang Feng Yuan , Lu Zhong Yuan , He Shun Ai , Li Jun
Published: August 2011

The foam phosphogypsum with low bulk density has been prepared. The influence of retarder content and water-cement ratio on the setting time and strength of phosphogypsum paste, and the effect of water-reducing agent and bulk density on the strength of foam phosphogypsum have been studied. The mechanical behavior and thermal conductivity of the foam phosphogypsum have also been researched. Besides, the failure curve of the as-prepared foam is plastic-like which is different from the brittle failure of normal foam concrete. And the high energy absorption effect of the samples has also been found.
Thermal Storage Technology on Solar Energy Wood Drying in China
Authors: Zhang Yan Lai , Liu Chuan Mei , Luo Lei , Zhang Hong , Li Li Jun , Zhang Ming Long
Published: August 2011

The article mainly discusses the application situation on the solar energy wood drying in China, and summarizes its advantages and problems in the real application. Because solar energy is low in thermal density, intermittent, and it is affected by weather, these have very big limitation to use solar energy in the actual production process. Based on these, it is introduced that the advantages of thermal energy storage technology in wood drying process of solar energy, the main application modes and the actual application status. It summarizes the major thermal energy storage materials and their basic characteristics, discusses the application prospect and the importance on the latent heat storage technology in wood drying.
Preparation and Thermoelectric Properties of Highly Oriented NaxCo2O4 by Solution Combustion Synthesis Method
Authors: Zhang Li Hua , Okinaka Noriyuki , Tosho Tsuyoshi , Akiyama Tomohiro
Published: August 2011

NaxCo2O4 (x= 1.4~1.9) ceramics were synthesized by solution combustion synthesis (SCS) method and sintered by spark plasma sintering (SPS) method in this paper. The synthesized bulk samples showed a relatively high orientation degree analyzed by XRD. Thermoelectric properties of the as synthesized bulk samples were investigated in the direction parallel to the press direction of SPS from room temperature to 857 K. Among all the samples, the highest power factor 3.07 ´ 10-4 W×m-1×K-2 was obtained at 817 K when x = 1.6, and the highest ZT value of this sample was 0.064 at 817 K.
A New Theoretical Equation for Effective Thermal Conductivity of Cellular Concrete
Authors: Li Xiang Yu , Zhao Xiao Long , Guo Xiang Yong , Cao Li Qiang
Published: August 2011

A new theoretical equation that represents the thermal conductivity of two-phase composite has been proposed. The Cheng-Vachon equation has been modified by introducing a new parameter that is the corrected porosity. It was found that the new equation can describe the thermal conductivity of cellular concrete very accurately. Development of the equation is helpful to understanding heat transfer mechanism and improving thermal property of cellular concrete.
Mechanical Properties of Concrete Mixed with SiO2 and CaCO3 Nanoparticles
Authors: Wang De Zhi , Meng Yun Fang , Zhang Yin Yan
Published: August 2011

The split tensile strength and compressive strength of concrete mixed with SiO2and CaCO3nanoparticles have been experimentally studied. SiO2nanoparticles as a partial cement replaced by 0.5, 1.0, 2.0 and 3.0 wt.% and CaCO3nanoparticles by 1.0 and 3.0 wt.% were added partially to concrete. Curing of the specimens has been carried out for 7, 28, 78 and 128 days after casting. SiO2nanoparticle as a partial replacement of cement up to 3.0 wt.% could accelerate formation of CSH gel at the early ages and hence increase the split tensile strength and compressive strength. The optimal replacement level of cement by SiO2nanoparticles for producing concrete with improved strength was set at 2.0 wt.%. CaCO3nanoparticles as a partial replacement of cement up to 3.0 wt.% could consume crystalline Ca(OH)2and accelerate formation of calcium carboaluminate hydrate at the early ages and increase the split tensile strength and compressive strength. The optimal replacement level of cement by CaCO3nanoparticles for producing concrete with improved strength was set at 3.0 wt.%.
Analysis of the Low Temperature Performance of Warm Mix Asphalt
Authors: Wang Hai Jun
Published: August 2011

This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text. The warm mix asphalt (WMA) refers to technologies that allow a significant reduction of mixing and compaction temperatures of asphalt mixes through lowering the viscosity of asphalt binders. In this paper, Shell90 # and SK70 # are two matrix asphalt with Sasobit® modifier to prepare for WMA's penetration and ductility, and calculate the equivalent crisp points, evaluate the low temperature performance at 5°C and 15°C, respectively. The results indicate that compared with the Shell90# without and with 5% Sasobit®, its penetration and ductility were reduced by 24.5%, 65.5% at 15°C. For SK70#, its penetration and ductility were reduced by 25.0%, 67.1%. WMA equivalent crisp points test with Shell90 # and SK70 #, compared with the matrix asphalt reduced by 10.03°C and 4.02°C, the addition of 3% Sasobit® to two matrix asphalt binders may also reduce ductility by 22.5% and 26.2%, respectively at 5°C.
Mix Design and Performance Test of High-Strength Fluid and Micro-Expansion Concrete with the Additive of CAN
Authors: Li Wen Hua , Zhou Shi Sheng , Chen Xu Dong
Published: August 2011

High-strength flowing concrete is made of large volume of gelled materials and high rate of sand, but low content of coarse aggregate and small grain diameter, which makes it easy to have a greater contraction, resulting in reduced strength and durability of concrete[4] .So the right amount of expansion admixture is needed to ensure that there is no shrinkage or micro-expansion of the concrete. In this paper, the right mixing ratio of the concrete will be achieved, which is consistent with needs of project, by designing tests of mixing ratio of different gelled materials (cement, fly ash, silica fume and expansion admixture) and mix design of high-strength fluid and micro-expansion concrete with the CAN admixture inside and by measuring its performance.
Removal of Rotenone from Contaminated Water Using Molecularly Imprinted Polymeric Microspheres
Authors: Zhang Kai Cheng , Zhao Si Ying , Yang Ming
Published: August 2011

A new method of removing rotenone from contaminated water using molecularly imprinted polymeric microspheres (MIPMs) is described. The MIPMs were prepared by the emulsifier-free polymerization method. The removal efficiency and selective recognition ability of the MIPMs were studied. The highest removal efficiency was observed at pH = 8. Moreover, the MIPMs can be re-used for at least 10 times without losing any removal efficiency. The MIPMs provided a selective, simple, reliable and practicable solution to remove rotenone from contaminated water.
Numeric Simulation of Fracture Extension within Surrounding Rock under Continuous Excavation
Authors: Li Gui Lin , Wang Li , Mao Yuan Chun
Published: August 2011

This paper aims at progressive failure within surrounding rock under continuous excavation, such as mining, underground powerhouse building, etc. A meso-damage model is proposed, which include the damage law under complex stress state for brittle materials, and the damage evolution based on stiffness degradation. The damage model is embedded into the FEM program. To test and very the damage model, a example of continuous excavation of underground mining is simulated. The result shows that the crack field growth is in accordance with that the similar material experiment.
Seismic Performance of Concrete-Filled-Tube Column to RBS Beam Connections with Crossing Diaphragm - Finite Element Analysis
Authors: Li Cheng Yu , Li Rui
Published: August 2011

For studying seismic behavior of concrete filled steel tube (CFST) column to RBS beam connections with crossing diaphragm under cyclic loading, Base on 3-D nonlinear finite element models which were used to analyze the mechanical properties using ANSYS, compared with CFST column to H-beam connections with exterior concentric annular, the finite element analyses were conducted to investigate the influences of hysteresis loops, the stress distribution rules, stiffness degradation and failure mechanism. It found that this connection not only transfers a plastic hinge from the root of beam end to the reduce section, but it little affects stiffness degradation. In addition, due to the crossing diaphragm that is beneficial to transfer shear to core concrete and provides the tensile force to beam, it improves the deformation of column. Consequently, this joint has a better seismic capability.
Simulation of the Dynamic Characteristics of the Coupled System Structure
Authors: Wang Dong , Gao Shi Qiao , Kasperski Michael , Liu Hai Peng , Jin Lei
Published: August 2011

The human body forms a complex dynamic system with more than one natural frequency and provides considerable damping capacities. Therefore, the coupled system of a structure and the occupants can hardly be described with its basic dynamic characteristics considering only the mass of the occupants. Depending on the natural frequency of the empty structure, the human body dominantly acts like a mass, a mass and a damper or a damper. If the natural frequency of the empty stand increases 3 Hz, the human body induces considerable damping into the coupled system. In the limit, the dynamic characteristics can be described based on the average values of the characteristics of the human body.
Calculation of Shrinkage-Creep Analysis for Long-Span Concrete Continuous Rigid Frame Bridge
Authors: Yin Can Bin , Yu Fang
Published: August 2011

Take Longtan river super large bridge as example,establishing finite element model with Bridge Doctor to analysis the influence shrinkage and creep.The deformation prediction of the bridge in the construction process and after completion was made based onseveral.Each prediction results were analyzed and compared.
Sun Light Difference Effect on Long-Span PC Continuous Rigid Frame Bridge
Authors: Yu Fang , Yin Can Bin
Published: August 2011

In the process of cantilever construction of the Longtan river bridge ,the WZP-035 thermally sensitive as measured points of temperature were buried into two segments of box-girder,and the temperature field of box-girder concrete was observed for three days. The temperature field and its variation laws of box girder bridge were discussed based on measured data. A vertical and transverse thermal gradient model of PC box girder,which could apply in central south China,was presented.This model was compared with the measured data and the thermal effect was analyzed.Results show that the calculated with the model agrees well with field test result and the modle is of some value for the measurement of sun light thermal difference effect on box girder bridge.
Nonlinear Analysis on Flexural Behavior of Externally Prestressed Composite Beam
Authors: Zhang Yun Long
Published: August 2011

Steps loading method was used to caculate the whole bending process of a composite beam loaded verticaly in order to accurately analyze the bending performance of composite beams. It has taken into account a variety nonlinear constitutive relations of different materials and based on the layered-step sections transformed method. The displacement of external prestressed steel bars were expressed with rotation angles at anchor points using finite bar elements method. This method is proved reasonable and reliable by comparative analysis of the calculating and the experimental results. It is feasible to analyze the forces and deformations of composite beams which were effcted by nonlinear material factors with layered-step sections transformed method.
Status and Psychology of DBB and BOT Construction Project Participants
Authors: Leu Wen Hao , Chang Andrew S
Published: August 2011

Adopting the BOT (build-operate-transfer) delivery method for construction projects has brought opportunities for desired performance. Studies have investigated many issues of BOT projects such as concessionaire selection criteria or risk factors, but the soft issue of the status and psychology change of project participants from traditional DBB (design-bid-build) method is not investigated. This research explored the status and psychology of DBB and BOT project participants and drew implication for performance. By using the case study method, this study selected ten projects in which five from DBB and five from BOT methods; interviewed 36 owners, designers, constructors and other participants in 14 times; and analyzed and compared their design and construction work interaction, designer and constructor status, and owner and concessionaire psychology. It is found that for DBB civil projects performance would be stable because of completed design, more cautious owner, and respected designer that is good to performance. For BOT civil projects, performance would vary and the designer and constructor can better cooperate. The flexibility and vitality brought by the BOT mechanism should be better used to create better performance.
Preparation of Composite-Fiber Reinforced External Wall Board without Asbestos
Authors: Wang Ying , Wang Peng Qi , Tan Dan Jun , Zhao Jin Ping
Published: August 2011

Asbestos is used as reinforcing fiber in nearly all the current external wall board manufacturing process, but it has harmful effects on the human body. In this paper, composite-fiber reinforced external wall board without asbestos was successfully prepared using plant fibers as reinforcing material instead of asbestos by compression molding. Effect of the content of wood fiber, wood powder, quartz sand and water on the density and mechanical properties of the board were studied in this work. Besides, the optimized preparation method for composite-fiber reinforced external wall board without asbestos was achieved.
Analysis on Vertical Pre-Stressing Diffusive Effect of PC Box Beam Web
Authors: Zhao Bao Jun , Luan Juan , Meng Jiang
Published: August 2011

In order to study the vertical pre-stressed girder under the action of perforation of the stress distribution characteristics, the paper simulated box beam web under the stress field affected by vertical pre-stressing forces using pairs of force acted on the long and narrow rectangular thin plate, deducted analytical solution to the vertical normal stress, and obtained the numerical solution through the least squares method. On the basis of the uniformity of vertical pre-stressing forces and stress level, the vertical pre-stress diffusive angle of the web fitting to engineering calculations was acquired. Through testing and finite element method simulating the vertical stress dispersive effect of the real bridge web, the result matched well with the deducted equation.
Finite Element Analysis on Load-Bearing Behavior of Concrete Filled Steel Tubular Composite Frames
Authors: Huang Yuan , Yi Wei Jian , Nie Jian Guo
Published: August 2011

This paper presents a nonlinear finite element (FE) analysis on the mechanic behavior of concrete filled steel tubular (CFST) composite frames. The main purpose of the FE analysis was to investigate the seismic behavior of composite frames. Three kinds of nonlinearity, namely material nonlinearity, contact nonlinearity and geometry nonlinearity, were taken into account in the FE model using MSC.Marc. The element type, connection between element, material constitutive law and boundary condition was described in detail. The elasto-plastic behavior, as well as fracture and post-fracture behavior, of the FE analysis models fitted well with those of the test specimens. The beam and panel zone deformation of the analysis models is also in good agreement with that of the test specimen. It is concluded that FE model of CFST composite frame is reliable and could be regarded as a helpful tool to expand the information on seismic behavior of CFST composite frame.
Image Segmentation of Wood with Knot Defects Based on Gray Transformation
Authors: Mu Hong Bo , Qi Da Wei , Zhang Ming Ming
Published: August 2011

Wood knot image obtained by X-ray was done gray transformation. The contrast of the image after gray transformation can be enhanced obviously and the position of knot can be highlighted. Binary processing was adopted for the image after gray transformation. The defects areas of the binary images are filled. Then, invert the best binary image of wood defect, and then adduct the obtained image. The result of wood defect image plus is that defects regions take apart completely with their background, which means the image segmentation is completed. Wood utilization is improved. The experiment results show that this method is feasible and effective.
The Analysis of Architecture Image of Anande Temple - The Value and Protection of Gude Temple in Wuhan City
Authors: Zhu Sun , Chen Li
Published: August 2011

Anande Temple originated from Myanmar, which belongs to Theravada Buddhism. Anande was the son of the Sakyamuni’s uncle, Hufan, and he finally became one of the Ten Great Disciples of Sakyamuni. Dedicated to the Buddhist temple, AnandeTemple is the most important Theravada Buddhist temple. According to literature, this kind of architectural style has only two buildings: one is AnandeTemple in Myanmar, the other is Gude Temple in Wuhan.This article mainly discusses the idea of restoration programming system of Gude Temple, one of the four jungles in Wuhan city. From the different characteristics in cultural value and architectural space layout represented by “Tianzhu standard” and “Garan seven standard”, the author explains the overall cultural understanding of Gude Temple and program the system with the consideration of cultural and environmental factors.
Study on the Bearing Mechanism of Bucket Foundation for Offshore-Wind Turbine in Soft Clay
Authors: Wang Jian Feng , Dai Hai Tao , Qin Ming
Published: August 2011

Based on numerical platform of large-scale finite element software, this paper investigates the function mechanisms of vertical load, horizontal load, and bending moment load of soft-clay-base bucket foundation. Then the corresponding load bearing characteristics of each load type of soft-clay-base bucket foundation are determined.