bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of structural factors related to spectroscopic data and redox potentials of CuT1 models through DFT tools
Authors: Vázquez‐Lima Hugo , Guadarrama Patricia 
Published: May 2011

AbstractSix complexes, mimics of T1 Cu active site, were studied under the density functional theory framework and their redox potentials were theoretically estimated with an average error of 0.095 V. Among different functionals, the hybrid functional PBE0 gave the best results to reproduce geometric parameters and to estimate redox potentials. The use of computational methods allowed the identification of relevant structural factors to rationalize spectroscopic and redox potential measurements. The inclusion of explicit molecules of solvent (tetrahydrofurane) showed that only those complexes with net positive charge exhibit coordination with the solvent. The consideration of such interaction permits the correct estimation of redox potentials. When the equilibrium between possible coordination isomers of T1 Cu models is taken into account, a reinterpretation of spectroscopic data (EPR and UV‐vis) is possible. These equilibria are governed mainly by entropic contributions and the solvation energy. © 2011 Wiley Periodicals, Inc. Int J Quantum Chem, 2012
Privacy protection for vehicular ad hoc networks by using an efficient revocable message authentication scheme
Authors: Fan Chun‐I , Hsu Ruei‐Hau , Chen Wei‐Kuei 
Published: May 2011

ABSTRACTCorrectness of exchanged information and guaranteeing the privacy of vehicle owners are the two most significant security concerns for VANETs. Pseudonymous public key infrastructure (PPKI) is a practical solution to these two issues. Almost all PPKI technologies are comprehensive schemes, such as the group signature‐based and identity‐based cryptosystems. An applicable PPKI scheme for secure vehicular communication (VC) should support revocability because it is a significant functionality in VANETs to revoke certificates of vehicles for surrendering or transferring the registrations. However, the computation or space complexity in most of the revocable PPKI‐based protocols is linear when the number of vehicles or revoked vehicles increases over time. This drawback markedly degrades the efficiency and stability of secure VC. This work therefore reduces the computation complexities of authentication message verification, certificate tracing, membership revocation, and space complexity of system parameters (e.g., revocation information and public keys), such that they are independent of the number of vehicles or revoked vehicles using a novel and efficient PPKI mechanism based on bilinear mapping. The proposed scheme uses the concept of accumulator schemes and transfers the computation of accumulators from vehicles to certificate authority (CA) for achieving constant computation and storage complexities on vehicles. The computation of accumulators on CA is also low in the proposed scheme. Finally, we formally prove that the proposed scheme, which is based on q‐strong Diffie–Hellman, n‐Diffie–Hellman exponent (DHE), variant n‐DHE, and decision linear Diffie–Hellman assumptions, is secure under the definitions of traceability and anonymity. Copyright © 2011 John Wiley & Sons, Ltd.
Spectrum redistribution for cognitive radios using discriminatory spectrum double auction
Authors: Lu Luxi , Jiang Wei , Bai Lin , Chen Chen , He Jianhua , Xiang Haige , Luo Wu 
Published: May 2011

ABSTRACTWith the reformation of spectrum policy and the development of cognitive radio, secondary users will be allowed to access spectrums licensed to primary users. Spectrum auctions can facilitate this secondary spectrum access in a market‐driven way. To design an efficient auction framework, we first study the supply and demand pressures and the competitive equilibrium of the secondary spectrum market, considering the spectrum reusability. In well‐designed auctions, competition among participants should lead to the competitive equilibrium according to the traditional economic point of view. Then, a discriminatory price spectrum double auction framework is proposed for this market. In this framework, rational participants compete with each other by using bidding prices, and their profits are guaranteed to be non‐negative. A near‐optimal heuristic algorithm is also proposed to solve the auction clearing problem of the proposed framework efficiently. Experimental results verify the efficiency of the proposed auction clearing algorithm and demonstrate that competition among secondary users and primary users can lead to the competitive equilibrium during auction iterations using the proposed auction framework. Copyright © 2011 John Wiley & Sons, Ltd.
Random time source protocol in wireless sensor networks and synchronization in industrial environments
Authors: Wang Fuqiang , Zeng Peng , Yu Haibin , Xiao Yang 
Published: May 2011

ABSTRACTReliability is a crucial aspect of time synchronization for industrial wireless applications in wireless sensor networks. Existing time synchronization algorithms often provide good synchronization in laboratory environments; however, outdoor environments with associated radio interference influence the performance of time synchronization. In this paper, we propose a random time source protocol for industrial wireless applications in wireless sensor network synchronization. Each synchronized node randomly selects its time source for each period in order to prevent reliance on a fixed time source because this may lead to resynchronization once the source fails. We have implemented the algorithm on the SIA2420 platform using TinyOS, and the results show the reliability of our protocol. Copyright © 2011 John Wiley & Sons, Ltd.
Factors affecting mourning dove harvest in Missouri
Authors: Bonnot Thomas W. , Schulz John H. , Millspaugh Joshua J. 
Published: May 2011

AbstractMourning dove (Zenaida macroura) management efforts have focused on reducing uncertainties in harvest management at national and regional scales, but there remains considerable interest in issues related to local, intensively managed areas. Our objective was to evaluate effects of different local management strategies, including field management and regulations, and weather, on the number of hunts and the number of doves harvested annually. We collected harvest information from dove hunters, and area management characteristics from wildlife managers on 9 public hunting areas in Missouri, USA from 2005 to 2009. Number of hunts on an area was best explained by number of hectares of crop on the area; however, acreage above 50 ha offered limited increases in the number of hunts on a site. The most supported model for the number of doves harvested contained a positive effect of acreage of sunflowers (Helianthus annuus) in good or excellent condition. This model was followed by a closely competing model reflecting increases in the number of doves harvested when an area used daily lottery and shot‐type restrictions; however, complete overlap between these 2 regulations prevented separation of their individual effects. To manipulate hunting opportunities and harvest levels in Missouri, managers can be most effective by controlling hectares and condition of managed croplands, especially sunflowers. However, further work is needed to assess the relative impacts of lottery regulations and nontoxic‐shot restrictions on dove harvest. © 2011 The Wildlife Society.
Structural and Vibrational Studies of Sr2[W(CN)8]·10H2O
Authors: Daszkiewicz Marek , Marchewka Mariusz K. , Typilo Iryna , Gulay Lubomir D. , Semenyshyn Dariya 
Published: May 2011

AbstractThe crystal structure of distrontium octacyanotungstate decahydrate, Sr2[W(CN)8]·10H2O, was solved using X‐ray single crystal diffraction. The tungsten atom lies on a two fold axis. Eight cyanide anions create tetragonal antiprismatic coordination sphere of tungsten atom. The two edge‐sharing tetragonal antiprisms of [Sr(NC)3(OH2)5], create a dimer, [Sr2(CN)6(H2O)6(μ‐H2O)2], which lies on the inversion center. One symmetry independent water molecule is located in a void of 40 Å3. Vibrational (FT‐IR and FT‐Raman spectroscopic) behavior of main structural units is discussed. It was spectroscopically confirmed that the geometry of [W(CN)8]4– anion is slightly distorted from that corresponding to “free” anion. The number of observed bands is significantly lower than that expected for C2 point group.
Homogenization of a 1D nonlinear dynamical problem for periodic composites
Authors: Andrianov I.V. , Danishevs'kyy V.V. , Topol H. , Weichert D. 
Published: May 2011

AbstractIn this paper we study wave propagation through a composite material built up of a periodically repeated one‐dimensional structure of coated inclusions and matrix material by the application of the asymptotic homogenization method. We take into account geometrical nonlinearity, which is described by the Cauchy‐Green strain tensor and physical nonlinearity by the Murnaghan elastic potential. We take into account structural nonlinearity by considering the bonding between two materials to be imperfect. As a result we obtain homogenized equations for the low‐frequency range.
Venous Thromboembolism After Surgery for Benign Prostatic Hyperplasia
Authors: Bergqvist David 
Published: May 2011

AbstractA systematic review has been performed on venous thromboembolism after surgery for benign prostatic hyperplasia. The risk of deep vein thrombosis is two to four times higher after open surgery than after transurethral resection. The risk after the newer transurethral methods (laser, radiofrequency, heat) is not known. Specific studies on thromboprophylaxis are few and have limited numbers of patients. Nonetheless, thromboprophylaxis (heparin) reduces the frequency of postoperative deep vein thrombosis after open surgery. Studies on patients undergoing transurethral resection are lacking. Antifibrinolytic treatment to diminish bleeding does not seem to increase the risk of thrombosis.
Outcome of Radical Resection and Postoperative Radiotherapy for Thyroid Carcinoma Showing Thymus‐like Differentiation
Authors: Sun Tuanqi , Wang Zhuoying , Wang Jian , Wu Yi , Li Duanshu , Ying Hongmei 
Published: May 2011

AbstractBackgroundCarcinoma showing thymus‐like differentiation (CASTLE) is a rare disease that is difficult to diagnose. The aim of this study was to assess the effects of combined‐modality treatment in CASTLE patients.MethodsWe retrospectively studied patients identified between January 1, 2000 and December 31, 2009 as having CASTLE and who subsequently underwent surgery and radiotherapy or chemotherapy. Preoperative laboratory findings, ultrasonographic (US) and computed tomographic (CT) features, and fine‐needle aspiration biopsy (FNAB) specimens were evaluated.ResultsSeven patients with CASTLE were identified (four men, three women). The median age at initial diagnosis was 48 years (range 25–56 years). The five newly diagnosed patients were treated with curative surgery and postoperative radiotherapy, whereas two patients with recurrent disease were treated with salvage surgery plus radiotherapy or chemotherapy. All patients were disease‐free at a median follow‐up period of 34 months (range 12–61 months). The pattern of immunohistochemical staining was similar to that of thymic carcinoma. Specimens from all seven patients stained positively for CD5, CD117, and cytokeratin but were uniformly negative for thyroglobulin, thyroid transcription factor 1 (TTF‐1), and calcitonin.ConclusionsPatients with CASTLE have excellent outcomes after curative resection and postoperative radiotherapy compared with patients with anaplastic thyroid carcinoma. Even patients with local recurrent disease benefited from salvage surgery with subsequent operation and/or radiotherapy. CD5 immunohistochemical staining on FNAB samples may help identify the possible entities that are part of the differential diagnosis.
The chemotactic interaction between CCL21 and its receptor, CCR7, facilitates the progression of pancreatic cancer via induction of angiogenesis and lymphangiogenesis
Authors: Zhao Bin , Cui Kai , Wang Chang‐Liang , Wang Ai‐Liang , Zhang Bo , Zhou Wu‐Yuan , Zhao Wen‐Hua , Li Sheng 
Published: May 2011

AbstractBackgroundIn this study, we report the influence of CCL21 and its receptor, CCR7, on the progression of pancreatic cancer and illuminates the correlation between the CCL21/CCR7 axis and the angiogenesis and lymphangiogenesis of pancreatic adenocarcinoma (PAC).MethodsA total of 30 patients with pancreatic cancer was involved in the current study. The expression of CCL21 and CCR7 in cancerous tissues, paracancerous tissues and normal pancreas were investigated using real‐time PCR, Western blot and immunohistochemistry, respectively. In addition, we assessed microvessel density (MVD) and microlymphatic vessel density (MLVD) in tumor tissues using immunohistochemistry.ResultsCompared to paracancerous tissues and normal pancreas, CCL21 expression in cancerous tissues was detected at a significantly low level. In contrast, the CCR7 expression was considerably higher in cancerous tissues than in normal pancreas and paracancerous tissues. Additionally, a significant correlation between the expression pattern of the CCL21/CCR7 axis and clinicopathological features, such as lymph node metastasis, was identified. Furthermore, we found that CCL21 expression was significantly associated with MVD but not significantly associated with MLVD, while CCR7 expression was significantly associated with MLVD but not significantly associated with MVD.ConclusionsThe chemotactic interaction between CCR7 and its ligand, CCL21, may be a critical event during progression in pancreatic cancer, and its underlying mechanism may be induction of angiogenesis and lymphangiogenesis regulated by this chemotactic interaction.
Preoperative identification of intraoperative blood loss of more than 1,500 mL during elective hepatectomy
Authors: Yamamoto Yusuke , Shimada Kazuaki , Sakamoto Yoshihiro , Esaki Minoru , Nara Satoshi , Kosuge Tomoo 
Published: May 2011

AbstractBackgroundDespite recent advances in surgical techniques, hepatectomies remain one of the most hemorrhagic procedures in abdominal surgery. It is important to identify preoperatively patients who are at high risk of suffering massive intraoperative blood loss.MethodsThe clinical records of 251 patients who underwent an elective hepatectomy for liver tumors between September 2007 and December 2009 were reviewed retrospectively. A multivariate logistic regression analysis of preoperative factors potentially influencing intraoperative blood loss was performed. We set the cut‐off value of the amount of blood loss for safe hepatectomy as less than 1,500 mL because no patients with blood loss of less than 1,500 mL received blood transfusion in this study. A scoring system to predict blood loss of more than 1,500 mL was constructed and validated in a cohort of 59 subsequent patients.ResultsIntraoperative blood loss of more than 1,500 mL was recognized in 35 of 251 patients (13.9%). Prothrombin activity < 70%, nonperipheral location of the tumor, involvement of hepatic veins, body mass index ≥ 23.0, and major hepatectomy were independently associated with intraoperative blood loss of more than 1,500 mL. The score was calculated by assigning 1 point for each of the 5 risk factors. The area under the receiver operating characteristic curve (AUC) was 0.814 (95% CI 0.731−0.898). This scoring system was highly predictive in the subsequent validation group of 59 patients (AUC = 0.839, 95% CI 0.710−0.969).ConclusionThis predictive scoring system is considered to be useful for identifying before hepatectomy those patients with a high risk of intraoperative blood loss of more than 1,500 mL.
What is a problem?
Authors: Schmidt Jan C. 
Published: May 2011

Abstract
Among others, the term “problem” plays a major role in the various attempts to characterize interdisciplinarity or transdisciplinarity, as used synonymously in this paper. Interdisciplinarity (ID) is regarded as “problem solving among science, technology and society” and as “problem orientation beyond disciplinary constraints” (cf. Frodeman et al.: The Oxford Handbook of Interdisciplinarity. Oxford University Press, Oxford, 2010). The point of departure of this paper is that the discourse and practice of ID have problems with the “problem”. The objective here is to shed some light on the vague notion of “problem” in order to advocate a specific type of interdisciplinarity: problem-oriented interdisciplinarity. The outline is as follows: Taking an ex negativo approach, I will show what problem-oriented ID does not mean. Using references to well-established distinctions in philosophy of science, I will show three other types of ID that should not be placed under the umbrella term “problem-oriented ID”: object-oriented ID (“ontology”), theory-oriented ID (epistemology), and method-oriented ID (methodology). Different philosophical thought traditions can be related to these distinguishable meanings. I will then clarify the notion of “problem” by looking at three systematic elements: an undesired (initial) state, a desired (goal) state, and the barriers in getting from the one to the other. These three elements include three related kinds of knowledge: systems, target, and transformation knowledge. This paper elaborates further methodological and epistemological elements of problem-oriented ID. It concludes by stressing that problem-oriented ID is the most needed as well as the most challenging type of ID.
Item Selection in Multidimensional Computerized Adaptive Testing—Gaining Information from Different Angles
Authors: Wang Chun , Chang Hua-Hua 
Published: May 2011

Over the past thirty years, obtaining diagnostic information from examinees’ item responses has become an increasingly important feature of educational and psychological testing. The objective can be achieved by sequentially selecting multidimensional items to fit the class of latent traits being assessed, and therefore Multidimensional Computerized Adaptive Testing (MCAT) is one reasonable approach to such task. This study conducts a rigorous investigation on the relationships among four promising item selection methods: D-optimality, KL information index, continuous entropy, and mutual information. Some theoretical connections among the methods are demonstrated to show how information about the unknown vector θ can be gained from different perspectives. Two simulation studies were carried out to compare the performance of the four methods. The simulation results showed that mutual information not only improved the overall estimation accuracy but also yielded the smallest conditional mean squared error in most region of θ. In the end, the overlap rates were calculated to empirically show the similarity and difference among the four methods.
Arthroscopic Arthrolysis for Arthrofibrosis of the Knee after Total Knee Replacement
Authors: Hegazy Alaa M. , Elsoufy Mohamed A. 
Published: May 2011

Background Arthrofibrosis is an uncommon but potentially debilitating complication following total knee replacement which can result in chronic pain and poor recovery of range of motion. The treatment of this condition remains difficult and controversial. Questions/aims of study We reviewed our results of arthroscopic arthrolysis of arthrofibrosis of the knee after total knee replacement to assess the potential for this technique to improve range of motion and provide improvement in knee function and pain as measured by the Knee Society Score (KSS). Methods Eight patients were treated for arthrofibrosis after total knee replacement with arthroscopic management. The patients included five females and three males. The average age was 67.4 years. Initial rehabilitation efforts, which included manipulation under anesthesia, had failed. Arthroscopic arthrolysis was performed to release fibrous bands in the suprapatellar pouch and to reestablish the medial and lateral gutters. Lateral release of the patellar retinaculum was performed. Intensive physiotherapy and continuous passive motion began immediately post-operatively. The average follow-up was 37.4 months. The KSS was used for assessment of pain and function before arthroscopy and at the latest follow-up. Results Six of the eight patients experienced improvement in the KSS. The average functional score showed improvement from 68 points pre-operatively to 86 at the time of final follow-up. The average pain scores improved from 30 points pre-operatively to 41 at the time of final follow-up. Conclusions Arthroscopic management can be beneficial for patients suffering from arthrofibrosis following total knee replacement. Pain and KSS clinical scores can markedly improve.
Cancellation of in vitro fertilization treatment cycles predicts treatment outcome in female infertility patients aged 40 years or older
Authors: Sugimoto Kouhei , Hashimoto Tomoko , Takahashi Eri , Saito Yukiyo , Haino Takayuki , Sasaki Hiroshi , Kusuhara Koji , Tanaka Tadao 
Published: May 2011

AbstractPurposeTo investigate potential indicators of in vitro fertilization (IVF) treatment outcome for female infertility patients aged ≥ 40 years based on the clinical course.MethodsWe retrospectively examined results of 111 female infertility patients aged ≥ 40 years undergoing IVF treatment. We investigated the relationship between treatment cycle cancellation and the final outcome of IVF treatment in female infertility patients aged ≥ 40 years.ResultsA total of 44 pregnancies were achieved. Overall pregnancy rate per initiated treatment cycle was 12.1%, and 24 spontaneous abortions occurred (54.5%). No woman aged ≥ 45 years achieved pregnancy. No patients conceived after 10 treatment cycles while 42 (11.5%) oocyte pick‐up cycles and 120 (33.0%) embryo transfer cycles were canceled. Investigation of correlation with treatment cycle cancellation revealed that patients who experienced embryo transfer cancellation had a high spontaneous abortion rate while only a few patients who experienced oocyte pick‐up cancellation achieved pregnancy and even fewer achieved a successful outcome.ConclusionsOur study suggests that, in addition to patient age and number of treatment cycles, cancellation of treatment cycle also provides another useful indicator for pregnancy outcome.
Estimating a Dynamic Model of Sex Selection in China
Authors: Ebenstein Avraham 
Published: May 2011

AbstractHigh ratios of males to females in China, which have historically concerned researchers (Sen 1990), have increased in the wake of China’s one-child policy, which began in 1979. Chinese policymakers are currently attempting to correct the imbalance in the sex ratio through initiatives that provide financial compensation to parents with daughters. Other scholars have advocated a relaxation of the one-child policy to allow more parents to have a son without engaging in sex selection. In this article, I present a model of fertility choice when parents have access to a sex-selection technology and face a mandated fertility limit. By exploiting variation in fines levied in China for unsanctioned births, I estimate the relative price of a son and daughter for mothers observed in China’s census data (1982–2000). I find that a couple’s first son is worth 1.42 years of income more than a first daughter, and the premium is highest among less-educated mothers and families engaged in agriculture. Simulations indicate that a subsidy of 1 year of income to families without a son would reduce the number of “missing girls” by 67% but impose an annual cost of 1.8% of Chinese gross domestic product (GDP). Alternatively, a three-child policy would reduce the number of “missing girls” by 56% but increase the fertility rate by 35%.