bluuebunny/crossref_metadata_2025 huggingface dataset:
Prédicats atypiques en néerlandais contemporain : le cas du type overvallen
Authors: Pekelder Jan
Published: January 2015

Il est connu qu’en néerlandais contemporain le sujet nominal défini / indéfini précède en règle générale le COD nominal défini / indéfini en zone médiane, i. e. l’espace entre le verbe conjugué et le reste verbal (Nieuwborg 1968 : 57-258 ; Haeseryn et al. 1997 : 1322). Cependant, un certain nombre d’exceptions ont été relevées (Nieuwborg 1968 : 118-119 ; Godin 1992 : 101, Broekhuis 1997 : 38-39 ; Haeseryn et al. 1997 : 1322, 1333-1335). Dans cette contribution, nous nous limiterons aux énoncés tels que toen overviel (prédicat) de soldaten (objet direct) een hevig heimwee (sujet) (« à ce moment-là, les soldats furent envahis par un mal du pays intense »). D’après Nieuwborg (1968 : 118-119), l’ordre sujet-COD est permutable si le sujet et le prédicat sont de nature abstraite et émotive. Haeseryn et al. (1997 : 1322, 1335), quant à eux, observent que l’ordre COD-sujet est acceptable à condition que le COD désigne une entité animée et le sujet une entité non animée. L’objectif de cette contribution consiste à montrer que les conditions ainsi formulées ne permettent pas de rendre compte de manière satisfaisante des phénomènes à partir du moment où l’on élargit le champ d’investigation. Aussi, nous nous attacherons à une reformulation des conditions de permutation sujet-COD. Elle passera par l’introduction de quatre nouveaux paramètres, i. e. (1) la valence du prédicat, (2) l’affectation du COD, (3) l’informativité et la définitude du sujet et du COD et (4) le poids syntaxique du sujet.
Optical Coherence Tomography Measurements of Choroidal Thickness in Healthy Eyes: Correlation With Age and Axial Length
Authors: Abbey Ashkan M. , Kuriyan Ajay E. , Modi Yasha S. , Thorell Mariana R. , Nunes Renata P. , Goldhardt Raquel , Yehoshua Zohar , Gregori Giovanni , Feuer William , Rosenfeld Philip J.
Published: January 2015

BACKGROUND AND OBJECTIVE:

To evaluate subfoveal choroidal thickness (CT) in healthy eyes using spectral-domain optical coherence tomography (SD-OCT) and provide correlations between age and axial length.

PATIENTS AND METHODS:

Enhanced depth SD-OCT imaging was performed with Cirrus (Carl Zeiss Meditec, Dublin, CA) and Spectralis (Heidelberg Engineering, Heidelberg, Germany) instruments. CT was measured from the outer limit of the retinal pigment epithelium to the inner surface of the sclera.

RESULTS:

The study enrolled 155 patients, with at least 20 in each decade between 22 and 89 years old. Mean axial length was 23.6 mm. Mean Heidelberg subfoveal CT was 286 µm. The correlation between Heidelberg and Zeiss subfoveal CT measurements was strong (
r
= .978) and significant (
P
< .001). Mean subfoveal CT was 7.7 µm thinner by Heidelberg versus Cirrus (
P
< .001). Multiple linear regression analysis revealed that age (
P
< .001), axial length (
P
= .001), and sex (
P
= .025) were significantly related to Heidelberg subfoveal CT.

CONCLUSION:

There is a strong negative correlation between CT and age (
P
<.001), with a 25 µm decrease in CT for each decade of life. Increasing axial length demonstrated a negative correlation with CT, decreasing 24.9 µm for each mm of axial length. Future studies of CT measurements can be performed on either instrument and must account for axial length, age, and sex to make appropriate conclusions.

[
Ophthalmic Surg Lasers Imaging Retina.
2015;46:18–24.]
Choroidal Thickness and Choroidal Blood Flow After Intravitreal Bevacizumab Injection in Eyes With Central Serous Chorioretinopathy
Authors: Okamoto Masahiro , Matsuura Toyoaki , Ogata Nahoko
Published: January 2015

BACKGROUND AND OBJECTIVE:

To quantitatively evaluate choroidal thickness (CT) and choroidal blood flow in the subfoveal region after intravitreal bevacizumab injection (IVB) for the treatment of chronic central serous chorioretinopathy (CSC).

PATIENTS AND METHODS:

Prospective, comparative study of 20 eyes with chronic CSC and and 20 fellow eyes treated with 1.25 mg/0.05 mL IVB. Subfoveal CT and serous retinal detachment height were measured using enhanced depth imaging optical coherence tomography. Subfoveal choroidal blood flow was assessed by the mean blur rate of laser speckle flowgraphy. IOP, blood pressure, and pulse rate, and ocular perfusion pressure were also measured. All measurements were made before and after IVB.

RESULTS:

Subfoveal fluid was not present after IVB in the affected eyes. The mean subfoveal CT decreased from 335 µm at baseline to 304 and 291 µm at 1 and 3 months, respectively, after IVB. Average mean blur rate ratio decreased from baseline to 92.9% and 88.0% at 1 and 3 months, respectively. In the fellow eyes, subfoveal CT and choroidal blood flow decreased slightly from baseline. There was a significant correlation between the decrease in subfoveal CT and choroidal blood flow after IVB in affected eyes. IOP, mean arterial pressure, pulse rate, and ocular perfusion pressure did not change significantly after IVB.

CONCLUSION:

IVB significantly reduced subfoveal CT, choroidal blood flow, and subretinal fluid absorption in eyes with chronic CSC. The reduction of subfoveal CT after IVB was likely caused by the reduction of subfoveal choroidal blood flow.

[
Ophthalmic Surg Lasers Imaging Retina.
2015;46:25–32.]
Choroidal Thickness in Macular Holes: A Case-Control Study
Authors: Xu Lucy T. , Srivastava Sunil K. , Ehlers Justis P. , Kaiser Peter K.
Published: January 2015

BACKGROUND AND OBJECTIVE:

To evaluate choroidal thickness of patients with unilateral full-thickness macular holes (FTMHs) and contralateral vitreomacular adhesion (VMA) and healthy eyes.

PATIENTS AND METHODS:

A retrospective case-control study of patients with unilateral FTMH and contralateral VMA and matched healthy controls was performed. Choroidal thickness was measured at five locations (subfoveal and 1 mm and 2 mm from the center of the fovea nasally and temporally) and compared between groups.

RESULTS:

Nineteen case patients and 19 control patients were analyzed. Eyes with FTMH had thinner choroids compared with the contralateral eyes with VMA and the control eyes at all locations except 2 mm temporal from the fovea. Eyes with VMA had thinner choroids nasally from the fovea compared with control eyes.

CONCLUSION:

Choroidal thickness was significantly decreased in eyes with FTMH except at 2 mm temporal to the fovea and decreased in contralateral eyes with VMA in the nasal directions, suggesting an association between choroidal thinning and macular hole.

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:33–37.]
Recovery of Photoreceptor Layer on Spectral-Domain Optical Coherence Tomography After Vitreous Surgery Combined With Air Tamponade in Chronic Idiopathic Macular Hole
Authors: He Feng , Dong Fangtian , Yu Weihong , Dai Rongping
Published: January 2015

BACKGROUND AND OBJECTIVE:

Studies using sterilized air in chronic idiopathic macular holes show varying success rates, and the impact of a shorter duration of tamponade on photoreceptor layer recovery is not fully elucidated.

PATIENTS AND METHODS:

Surgical outcomes of 35 cases (seven in stage 3 and 28 in stage 4) were assessed for best corrected visual acuity and with spectral-domain optical coherence tomography.

RESULTS:

The primary closure rate was 91.4%, and the closed cases and unclosed cases were significantly different in the preoperative (
P
= .042) and postoperative (
P
= .040) diameter of the photoreceptor layer defect. After surgery, there was a significant improvement in best corrected visual acuity and a decrease in the photoreceptor layer defect. The postoperative logarithm of the minimal angle of resolution was significantly correlated with the preoperative hole diameter (
P
= .003) and the postoperative diameter of the photoreceptor layer defect (
P
= .005).

CONCLUSION:

Air tamponade is a safe and effective treatment for chronic and severe macular holes, with several spectral-domain optical coherence tomography parameters highly predictive of postoperative visual acuity

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:44–48.]
Retina Evaluation With Nonmydriatic Ultrawide-Field Color Imaging After Cataract Extraction Surgeries in Asymptomatic Patients
Authors: Schwartz Shulamit , Gonzalez Carmen Luz , Bhandari Ramanath , Oliver Scott N. , Mandava Naresh , Quiroz-Mercado Hugo
Published: January 2015

BACKGROUND AND OBJECTIVE:

To evaluate the role of nonmydriatic ultrawide-field (UWF) color retinal imaging as a screening tool in the follow-up of asymptomatic patients after cataract extraction surgeries.

PATIENTS AND METHODS:

A retrospective, observational case series. A review of electronic medical records identified patients after cataract extraction followed with UWF retinal imaging (Optos 200Tx; Optos, Dunfermline, Scotland). Images were graded and reviewed by a retina specialist. Outcome measures included image quality, the detection of peripheral lesions, and association with perioperative risk factors.

RESULTS:

Seventy-six eyes of 58 consecutive patients were enrolled. A good visualization of the peripheral retina was accomplished in more than 90% of patients. Peripheral lesions were identified in 40 eyes (52.6%) with no surgery-related retinal breaks and/or detachments. Additional pathologies were found in 35 eyes (46.1%).

CONCLUSION:

Nonmydriatic UWF color retinal imaging was found to be a useful screening tool in the follow-up of asymptomatic patients after cataract extraction in this series.

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:50–55.]
Dexamethasone Intravitreal Implant for Pseudophakic Cystoid Macular Edema in Patients With Diabetes
Authors: Khurana Rahul N. , Palmer James D. , Porco Travis C. , Wieland Mark R.
Published: January 2015

BACKGROUND AND OBJECTIVE:

Diabetic patients are at a higher risk of developing pseudophakic cystoid macular edema (PCME) after cataract surgery. This study evaluated the effect of dexamethasone intravitreal implant (DEX Implant 0.7 mg, Ozurdex; Allergan, Irvine, CA) in diabetic patients with PCME.

PATIENTS AND METHODS:

In this prospective case series, six patients with diabetes who developed PCME despite topical anti-inflammatory therapy were treated with a single dexamethasone implant. Outcome measures included best corrected visual acuity (BCVA) and central subfoveal thickness.

RESULTS:

The mean increase in BCVA from baseline to day 180 was 14 letters (
P
= .03); four of six patients (67%) achieved greater than 10-letter improvement in BCVA. The mean decrease in central subfoveal thickness was 100 µm (
P
< .01 vs baseline) by day 30 and 72 µm by day 180 (
P
= .004).

CONCLUSIONS:

A dexamethasone implant may be an effective treatment for diabetic patients who develop pseudophakic cystoid macular edema after cataract surgery.

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:56–61.]
Fluidics Comparison Between Dual Pneumatic and Spring Return High-Speed Vitrectomy Systems
Authors: Brant Fernandes Rodrigo A. , Diniz Bruno , Falabella Paulo , Ribeiro Ramiro , Teixeira Anderson G. , Magalhães Octaviano , Moraes Nilva , Maia Andre , Farah Michel E. , Maia Mauricio , Humayun Mark S.
Published: January 2015

BACKGROUND AND OBJECTIVE:

To compare the water and vitreous flow rates and duty cycle (DC) between two ultrahigh-speed vitrectomy systems: pneumatic with spring return (SR) and dual pneumatic (DP) probes.

MATERIALS AND METHODS:

The flow rate was calculated using a high-sampling precision balance that measured the mass of water and vitreous removed from a vial by a vitreous cutter. Frame-by-frame analysis of a high-speed video of the cutter was used to determine the DC. Three cutters of each gauge (20, 23, and 25 G) were tested with an SR and a DP system using the standard DC setting (biased open) at 0 (water only), 1,000, 2,000, 3,000, 4,000, and 5,000 cuts per minute (CPM) with aspiration levels of 100, 200, 300, 400, 500, and 600 mm Hg.

RESULTS:

The DC was slightly higher with the SR system using most parameters and gauges although without statistical significance. The water flow rate was somewhat higher with the SR system, except for 25 G with 4,000 and 5,000 CPM. The vitreous flow rate was similar using most parameters, with the SR system showing higher flows at lower cut rates (1,000–3,000 CPM).

CONCLUSIONS:

SR and DP systems produced similar water and vitreous flow rates. Additional studies in human eyes are necessary to confirm these findings.

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:68–72.]
Inner Segment Ellipsoid Layer Restoration After Macula-Off Rhegmatogenous Retinal Detachment
Authors: Sridhar Jayanth , Flynn Harry W. , Fisher Yale
Published: January 2015

Spectral-domain optical coherence tomography (SD-OCT) often reveals prominent outer retinal changes after macula-off rhegmatogenous retinal detachment. Two patients who presented with macula-off retinal detachment underwent surgical repair. Initial postoperative visual acuity was 20/200 in both cases and correlated with a disruption of the central inner segment ellipsoid layer on SD-OCT. On extended follow-up, SD-OCT demonstrated restoration of the inner segment ellipsoid layer in both patients with concurrent improved visual acuity.

[
Ophthalmic Surg Lasers Imaging Retina.
2015;46:103–106.]
Vitrectomy Without Gas Tamponade for Macular Retinoschisis Associated With Normal-Tension Glaucoma
Authors: Orazbekov Lukpan , Yasukawa Tsutomu , Hirano Yoshio , Ogura Shuntaro , Usui Hideaki , Nozaki Miho , Ogura Yuichiro
Published: January 2015

The authors present the case of a patient with normal-tension glaucoma and pit-like maculopathy observed by high-definition optical coherence tomography. Surgical management of macular retinoschisis was associated with improved vision and full resolution of intraretinal fluid and macular detachment. The patient had progressive vision loss over 6 months preoperatively; best corrected visual acuity and high-definition optical coherence tomography changes improved postoperatively. Optic disc pit-like maculopathy can occur in patients with normal-tension glaucoma in the absence of obvious congenital anomalies of the disc. The intraretinal fluid might have migrated from the vitreous cavity through a microhole at the optic disc margin or in the area with the nerve fiber defect. Vitrectomy without gas tamponade might lead to anatomic and functional recovery. Further studies are needed to better understand the pathogenesis of this disease.

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:107–110.]
Acute Macular Neuroretinopathy: A Case Report and Review of the Literature, 2002–2012
Authors: Aziz Hassan A. , Kheir Wajiha J. , Young Ryan C. , Isom Ryan F. , Dubovy Sander R.
Published: January 2015

Acute macular neuroretinopathy (AMNR) is a rare condition that primarily affects young women in their reproductive years. Many of the affected young women are on oral contraceptives. Patients report a sudden decrease in visual acuity, usually a few days after the onset of a febrile illness, with paracentral scotomas either unilaterally or bilaterally. Although AMNR was initially thought to be an inner retinal pathology, with the publication of 84 case reports in the English medical literature and the advent of new imaging modalities, it is now thought to be a disease of the outer retina. In 2003, Turbeville et al published a review of more than 41 AMNR cases reported from 1975 to March 2002, which summarized the available literature and suggested potential fields of research to be explored. This article summarizes the 43 case reports that were published in the English literature from April 2002 to October 2012 and also presents a unique case of AMNR.

[
Ophthalmic Surg Lasers Imaging Retina.
2015;46:114–124.]
Natural Course of Symptomatic Focal Choroidal Excavation
Authors: Pierro Luisa , Casalino Giuseppe , Introini Ugo , Gagliardi Marco , Sergenti Jessica , Cascavilla Maria Lucia , Bandello Francesco
Published: January 2015

A 32-year-old man was referred to the authors’ department for nonspecified macular dystrophy with persistent metamorphopsia in the right eye diagnosed 10 years before and followed using optical coherence tomography. The patient underwent a comprehensive ocular examination, including multimodal imaging evaluation and electrofunctional testing. The diagnosis was consistent with nonconforming focal choroid excavation. Over 10 years, no complications occurred, visual acuity was stable, and optical coherence tomography showed no progression of the lesion during follow-up. In this case, nonconforming symptomatic focal choroid excavation was a nonprogressive condition with good long-term visual outcome.

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:125–130.]
Stability of Macular Traction in Involutional Diabetic Retinopathy Over a 5-Year Course
Authors: Chao Daniel L. , Flynn Harry W.
Published: January 2015

Involutional diabetic retinopathy is a descriptive term for an end-stage phase of proliferative diabetic retinopathy (PDR), which is often non-progressive. Two patients with involutional PDR with nonprogressive macular traction documented by spectral-domain optical coherence tomography (SD-OCT) over a 5-year period are described in this report.

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:131–133.]
A Novel Clinical Sign in Macular Telangiectasia Type 2
Authors: Jindal Animesh , Choudhury Himadri , Pathengay Avinash , Flynn Harry W.
Published: January 2015

The objective of the study is to report, and propose a hypothesis for, a novel clinical sign in patients with macular telangiectasia type 2. Nine consecutive patients with macular telangiectasia and visible parafoveal graying were examined. The parafoveal graying decreased in intensity with continuous light exposure from an indirect ophthalmoscope. After dark adaptation for 15 minutes, the intensity of parafoveal graying increased again. This phenomenon appears to be a novel and global sign in patients with macular telangiectasia type 2. It could be a possible photochemical reaction occurring due to the release of chromophores from the abnormal Müller cells.

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:134–136].
The Role of Intravitreal Trimethoprim/Sulfamethoxazole in the Treatment of Toxoplasma Retinochoroiditis
Authors: Choudhury Himadri , Jindal Animesh , Pathengay Avinash , Bawdekar Abhishek , Albini Thomas , Flynn Harry W.
Published: January 2015

The authors evaluate the role of intravitreal trimethoprim/sulfamethoxazole in the treatment of toxoplasma retinochoroiditis (TRC) in four patients. Intravitreal injection of trimethoprim/sulfamethoxazole 1.28 mg/0.08 mL with dexamethasone 400 µg/0.1 mL was injected weekly or biweekly. After the initiation of treatment, a reduction in intraocular inflammation was observed clinically and on optical coherence tomography within 1 week. Three patients regained visual acuity of 20/20, and one patient improved to 20/40 with residual macular scarring. No evidence of retinal toxicity was noted on full-field electroretinogram. Intravitreal trimethoprim/sulfamethoxazole and dexamethasone combination may be an alternative treatment strategy in patients with TRC.

[
Ophthalmic Surg Lasers Imaging Retina
. 2015;46:137–140.]
Principal Preparation
Authors: Beycioglu Kadir , Wildy Helen
Published: January 2015

This chapter reports quantitative and qualitative survey data from Turkey as part of a larger International Study of Principal Preparation (ISPP) that examines the utility of principal preparation programs for novice principals in 13 contexts to find out what lessons can be learnt from each context. Conducted in 2010, this study sought responses from 123 principals in their first three years of appointment to identify the challenges they faced and the extent to which they perceived they were adequately prepared to face these challenges. The findings indicated that, although the participants perceived early years of principalship as challenging work, they felt that they were ready for these challenges, despite the emphasis on theory over practice in their preparation programs. Interestingly, principals who reported having greater than 10 years as assistant principals felt less adequately prepared than did their colleagues who had spent fewer than 10 years as assistant principals.
Qatar's Educational Reform
Authors: Romanowski Michael H.
Published: January 2015

Launched in 2004, Qatar's massive educational reform, Education for a New Era, has introduced numerous changes to the K-12 educational system forcing school leaders to face challenges and issues in their role of leading and managing the school community. This chapter reports the results of a qualitative research study that examines the critical issues K-12 principals face as they implement educational reform. Using semi-structured interviews, the voices of 20 principals are presented centering on the critical issues that have evolved during the reform and the skills and leadership styles necessary to address these issues that have shaped the Qatari educational reform. Discussion and recommendations are provided to assist educational leaders in similar contexts.
New Methods Exploring Facial Expressions in the Context of Leadership Perception
Authors: Trichas Savvas
Published: January 2015

The aim of this chapter is to add to our knowledge of the contribution of facial expression to educational leadership perception. Although there is a considerable amount of studies investigating leaders' emotional displays, the majority of this research does not use the sophisticated facial expression coding methods available in other psychological settings. However, research using such sophisticated methods shows that even subtle facial actions can result in significantly different impressions, indicating that credibility of facial expression interpretation might depend on the accuracy of facial expression description (see Rosenberg, 2005). In this chapter, the few leadership studies that have used sophisticated facial expression coding methods are reviewed. On the basis of these studies, it is recommended that educational organizations should be aware of the added value of these methods in order increase research credibility and provide educational leaders with specialized knowledge and skills that could eventually increase their effectiveness.
Transformational Leadership and Principals' Innovativeness
Authors: Sarafidou Jasmin-Olga , Xafakos Efstathios
Published: January 2015

This chapter presents an empirical investigation on aspects of leadership that may predict a school climate promoting research and innovativeness in Greek primary schools. Specifically, the authors examine principals' innovativeness and dimensions of transformational leadership as possible predictors of innovative school climate and teachers' attitudes towards research. Self-administered questionnaires were completed by 190 primary school teachers. The questionnaire included inventories measuring a) principals' innovativeness, b) three dimensions of transformational leadership style (vision building, individual consideration, intellectual stimulation), c) innovative school climate, and d) different aspects of teachers' attitudes towards educational research. Results demonstrate that principals' innovativeness tends to coexist with a leadership style that is transformational. Moreover, an innovative school climate is very likely to be established if the school principal not only provides stimulation and personalized care for teachers but also s/he acts as a model of innovativeness in school. Nevertheless, principals' innovativeness and a transformative leadership does not also ensure a research orientation in school.
Experimental Investigation on Aerodynamic Characteristics of Propeller in a Ducted-Fan Type VTOL UAV
Authors: Han Jing Ze , Jiang Bing Yan , Zhuang Chao Wei , Du Xiong Chun
Published: January 2015

An experimental investigation was completed with the objective of determining the performance characteristics of propeller in a Ducted-Fan Type VTOL UAV. The model consisted of three groups of two-bladed propellers with or withou an annular duct. The propellers share the same diameter but differernt blade pitchs.Model variations included the changes of the propeller and the duct shrouded combination. Static propulsion test data showed figure of lift increases with increasing blade pitch. The coaxial propellers lift did not perform as 2 times of the single propeller lift.The duct increase the duct fan system lift effectively.
Failure Characteristics of Rock-Like Material with Multi-Fissures under Uniaxial Compression
Authors: Cao Ri Hong , Cao Ping , Wen Pi Hua , Chen Rui Wen
Published: January 2015

Mechanical behavior and failure mode of jointed rock is one of the significant researches in rock mechanics field. In this work, combined with similar material testing and discrete element numerical method(PFC) to investigate the mechanical behavior and failure mode of the rock-like materials with multi-fissures. The numerical analyses agree well with physical experimentation. It is found that, fissures will weaken the strength of the rock-like material, and when the angle of the fissures is about 25°, the strength of the material reaches a minimum value. The weakening effect of fissure on specimen strength would decrease gradually along with the increase of fissure angle. Compared with the effects of fissure angle, the influence of cracks number to the strength is relatively small. The fissure inclination angle was the main factor of the failure modes. With the different fissure inclination angles, the crack tip of Micro-cracks presents different developmental pattern. However, the influence of fissure distribution density on the failure mode mainly reflects at the fracture penetration mode.
Research on the Effects of Admixtures on the Physical Properties of Titanium Gypsum
Authors: Liu Yan , Li Guo Zhong
Published: January 2015

Through to join in processing of titanium gypsum naphthalene series water reducing agent and sodium sulfate, study the effect of admixtures on the physical properties of titanium gypsum and mechanism analysis, and to determine the optimum content of admixtures. Research shows that when the content of naphthalene series water reducing agent was 3% water reducing effect is best, the titanium gypsum sample standard consistency water consumption is 126%,2h flexural strength was 1.06MPa, 2h compressive strength was 1.97MPa, absolutely dry flexural strength was 2.21MPa and absolutely dry compressive strength was 2.76 MPa. When the dosage of sodium sulfate is 1.5%, titanium gypsum physical performance is best,initial setting time and final setting time of 8 min and 10 min respectively,2h flexural strength was 1.35MPa, 2h compressive strength was 2.42MPa, absolutely dry flexural strength was 2.43MPa and absolutely dry compressive strength was 3.32 MPa.
Study on the Waterproofing Properties of Cement-Based Composite Thermal Insulation Materials
Authors: Li Jing , Li Guo Zhong
Published: January 2015

Polystyrene granules (EPS) for lightweight aggregate and cement for cementing material, while adding a variety of additives, were used to prepare cement-based composite thermal insulation materials by the method of vibration molding. The effects of different waterproof agent on water absorption and strength of cement-based composite thermal insulation materials were studied contrastively by adding emulsified stearic acid and emulsified composite waterproofing agent, and the related mechanisms were analyzed. Results showed that the waterproofing effect and strengthen effect of emulsified composite waterproofing agent is superior to emulsified stearic acid, when the content of emulsified stearic acid and emulsified composite waterproofing agent are 5% and 5%, respectively, the 2h, 24h water absorption of samples are 20.59%, 47.64% and 15.53%, 34.53%, the flexural and compressive strength of samples are 0.32MPa, 0.42MPa and 0.35MPa, 0.47MPa.
The Effects of Reaction Temperature on Nanographites Supported by SiC Particles
Authors: Chen Chen , Yu Jin Shan , Zhou Xin Gui , Zhang Chang Rui
Published: January 2015

Nanographites supported by silicon carbide (SiC) nanoparticles were prepared through one-step pyrolysis method using polycarbosilane (PCS) as the precursor at temperatures ranging from 1100°C~1400°C. The effects of reaction temperature on the morphology, microstructure and crystallinity of the graphite flakes on SiC particles were explored by means of SEM, TEM, RAMAN and XRD. The experimental results show that the desired products with core/shell structures can only be obtained at reaction temperatures higher than 1100°C. With the increase of reaction temperature (1250°C~1400°C), the thickness and the average size of sp2domains show an incremental trend before a decline while the density and the degree of deformation continuously improve. The possible mechanism for those changes was also discussed.
The Preparation of Modified Fiber Reinforced Desulfurization Gypsum Insulation Board
Authors: Li Lin Lin , Li Guo Zhong
Published: January 2015

Hydrogen peroxide was used as the foaming agent to reduce the density and thermal conductivity of composite insulation materials, and glass fibers were adopted to reinforce the performance of foamed composite insulation materials. Meanwhile, the mechanical properties of foamed composite insulation materials is studied, and the internal micro-morphology of samples were observed by SEM. The strengthening mechanism of fiber was analyzed. The results indicated that mixing foaming agent significantly decrease the density and thermal conductivity of samples, when the content of foaming agent was 4%, the minimum rate of thermal conductivity was 0.051W/(m•K). Wrapped VAE emulsion on the surface of glass fiber, glass fiber after surface modification could improve the strength of samples. The flexural and compressive strength of samples that adding glass fiber after surface modification were increased by 18.75% and 6.98% compared with samples that adding unmodified glass fiber.
Research on the Effects of Calcination Temperature on the Physical Properties of Titanium Gypsum
Authors: Liu Yan , Li Guo Zhong , Du Chuan Wei
Published: January 2015

This paper studies the different calcination temperature on the properties of titanium gypsum physical effects, and the mechanism of the effects are discussed in this paper. Research has shown that with the increase of calcination temperature, the mechanical properties of titanium gypsum present a trend of after rising first down. When the calcination temperature is 180 °C, titanium gypsum calcined product mainly for the half water gypsum phase, the mechanical strength of samples of titanium gypsum achieve maximum at this time, The mechanical properties of titanium gypsum samples: 2h flexural strength was 0.94MPa, 2h compressive strength was 1.87MPa, absolutely dry flexural strength was 1.54 MPa and absolutely dry compressive strength was 2.52 MPa.
Desulfurization Gypsum Whisker Preparation and Performance Study
Authors: Fu Peng , Li Guo Zhong
Published: January 2015

Using the desulfurization gypsum as raw material and the atmospheric acidification method, prepared desulfurization gypsum whisker, Studied water gypsum ratio, crystallization agent on properties of gypsum whiskers. Researchs show that, when the water gypsum ratio is 57.14%, the average ratio of length to diameter reaches the maximum value is 41.1; when using calcium chloride and Magnesium sulfate (the quality of various additives in the desulfurization gypsum quality accounted for 2%), the best effect, the ratio of length to diameter is 42.9.
The Cooling Module Aerodynamic Noise Prediction Considering Porous Media
Authors: Zhang Peng Fei , Zhu Mao Tao , Li Zhi Jun , Wang Kuan
Published: January 2015

The influence of the radiator and other components in the noise prediction process of cooling module is difficult to calculate. Firstly, the model including porous media is established. And the large eddy simulation (LES) is used to analyze its impact on the inflow instability and calculate the urbulent kinetic energy and vorticity around the fan. Then the main noise sources are identified by vortex sound theory. The acoustic BEM model is established for discrete and broadband aerodynamic noise prediction of cooling module. And the sound field sound pressure spectrum is analyzed. Finally, the noise test is made to verify the prediction. The results show that the radiator and other components have a huge influence in the flow field and noise prediction and they can not be ignored in the aerodynamic noise calculation process.
Energy Absorption of Basalt Filament Wound Rectangular Tubes: Experimental Study
Authors: Mokhtar Iqbal , Yahya Mohd Yazid , Abd Kader Ab Saman , Abu Hassan Shukur
Published: January 2015

The objective of this study was to determine the energy absorption of basalt filament wound rectangular tubes under crushing test. Basalt fibre gained a lot of potential in various application due to low cost of this material together with its capability to breaking the domination of e-glass as a reinforcement material. Coupon tensile and axial compression (crushing) test were performed to investigate the strength and energy absorption performance of basalt filament wound rectangular tubes. Both test have been conducted using [±700]3 winding angle of sample configuration and comparison have been made in coupon test in which the basalt sample shows 8.7% higher than e-glass while produced opposite results in modulus of elasticity. Crushing test was performed in 25mm displacement with different loading rate which are 5, 10 and 15mm/min. The results obtained from three different conditions were compared showing a higher energy absorbed in the lower loading rate. The comparable crashworthiness of basalt suggest possible applications such as automotive industry which is requires a good energy absorb materials in some particular components.
Microscopic Investigation of Geopolymers Made of Fused Slag from Gasification Processes Using Low-Grade Coal and Spent Catalyst Slag
Authors: Kim Yoo Taek , Choi Jun Won , Kim Seong Yeol
Published: January 2015

Geopolymers are prospective cement substitutes because their production generates smaller amounts of carbon dioxide and they have sufficient mechanical strength. Geopolymers have attracted increasing interest from construction industries because of their recyclability and eco-friendliness. The compressive strength of geopolymers is known to be associated with their Si/Al ratio. Fused slag from gasification processes using low-grade coal (FSLC) and spent catalyst slag (SCS) were used as raw materials for making geopolymers; the Si/Al ratio was controlled by mixing different ratios of FSLC and SCS. The compressive strength of a geopolymer with a Si/Al ratio of 1.04 had the highest strength (125.6 MPa). Scanning electron microscopy (SEM) analysis was also in good agreement with the compressive strength measurements of compressive strength. There were many small crystallites in the geopolymer matrix. Using transmission electron microscopy (TEM), these crystallites were found to be single crystals, which have a perfect crystal structure. It is speculated that the formation of small crystallites 10-30 nm in size, as well as large single crystals with diameters greater than 80 nm, in the matrix of a geopolymer during the geopolymerization process might increase its compressive strength.
Modification of Magnesium Hydroxide Flame Retardant Using Oleic Acid by Wet Method
Authors: Li Bao Xing , Zhu Li Xia , Liu Zhi Qi , Li Li Juan
Published: January 2015

The magnesium hydroxide (Mg(OH)2, MH) was modified using oleic acid (C17H33COOH, OA) by wet techonlogy. The modification effect of MH was evaluated by activation index and oil absorption rate. The optimum technological conditions were as follows: the concentration of magnesium hydroxide slurry was 35wt%, the oleic acid 2wt% ,temperature 70 °C, time 40 min and a stirring rate 2200 rpm. Additionally, the structure and morphology of the improved modified MH powders were characterized by SEM, XRD, FTIR, TGA-DSC. Compared with the unmodified MH, the modified MH had better dispersibility and hydrophobicity.
The Forecast of Co-Rotating Twin-Screw Extruder's Screw Based on BP Neural Network Model
Authors: Zeng Guang Sheng , Zhang Hui , Chen Hua
Published: January 2015

The established BP neural network model can forecast one of the wood-plastic composite molding equipment the screw of extruder with co-rotating twin-screw has been presented. The content of fiber and lubricant, the appropriate temperature of the extruder and the target yield are determined as the variable inputs, while the outputs are the diameters of the screw stem. This intelligent BP network model can forecast the condition of actual production precisely by setting the input properties of the material and the integration of products in order to fit the requirements of the wood-plastic composited production more successfully. Through the analysis of BP neural network model, the former simple method of choosing the screw stem’ diameters only depend on yield can be modified more efficiently.
Design and Research of Intelligent Knowledge Push Model
Authors: Wang Jing Dong
Published: January 2015

In viewing of information overload environment,traditional search engine has inherent insufficiency about retrieval accuracy and query mode,together with the characteristics of decision tree algorithm and knowledge push,this paper presets an intelligent knowledge push model,and discuss the mechanism of this model.The model strive to improve the retrieval efficiency and realize the intelligent service.
Numerical Control Lathe Cutting Force Signal On-Line Monitoring Design
Authors: Zhao Lin
Published: January 2015

The main research direction of Numerical control lathe cutting force signal on-line monitoring is to process real-time monitoring, using the sensor, charge amplifier, video acquisition card and computer to collect data and signal. Signal acquisition makes use of the piezoelectric sensor signals and send them to the computer in order to acquire the real-time data and display the dynamic signal so that monitor the process. Signal processing is the course that data will be collected for subsequent processing and analyzing. It includes display, filtering, correlation analysis, spectral analysis, etc. We can conclude the signal’s characteristics after the time domain and frequency domain analysis of signals.
Application of Federated Filter to AUV Based on Terrain-Aided SINS
Authors: Wang Qi , Qian Cheng Shan , Zhang Zi Jia , Yang Chang Song
Published: January 2015

To improve the navigation precision and reliability of autonomous underwater vehicles, a terrain-aided strapdown inertial navigation based on Federated Filter (FF) is proposed in this paper. The characteristics of strapdown inertial navigation system and terrain-aided navigation system are described in this paper, and Federated Filtering method is applied to the information fusion. Simulation experiments of novel integrated navigation system proposed in the paper were carried out comparing to the traditional Kalman filtering methods. The experiment results suggest that the Federated Filtering method is able to improve the long-time navigation precision and reliability, relative to the traditional Kalman Filtering method.
Effect on the Ability of Unit Frequency Modulation and the Dynamic Characteristic of Regulative System by Condenser Vacuum
Authors: Jin Jian Guo , He Nan
Published: January 2015

After analyzing and calculating the effect on the ability of unit frequency modulation and the dynamic characteristic of regulative system of the turbine by condenser vacuum, this paper does main research on the change of static different ratio and temporal constant of rotor when the vacuum changes. The effect on the economic characteristic, security and modulation capability are looked on more roundly when the condenser vacuum changes.
Experimental Research on Seismic Behavior of Wall Component with Double Steel Plates and Infill Concrete
Authors: Ma Xiao Dong
Published: January 2015

In order to study the seismic performance of wall component with double steel plates and infill concrete,three wall components with double steel plates and infill concrete were tested.The deformation performance and failure modes were observed under low cyclic lateral loads with high axial compression ratio.Valuable results were obtained for the hysteretic curves,skeleton curves,rigidity degeneration,ductility and energy dissipation capacity.The results indicate that Stud spacing is the key factor to prevent local buckling of steel plate, Steel plate and concrete stress as a whole;Setting stiffening rib, can improve the overall stiffness, bearing capacity and ductility, but had little effect on delaying wall cracks.
Low Cycle Fatigue Study for GH901 Material Based on Damage Mechanics Theory
Authors: Wang Yong Qi , Zhang Hai Bing
Published: January 2015

The low cycle fatigue damage of turbine disc which is made of GH901 material is systematic analyzed and studied in the article that is based on the theory of continuum damage mechanics and fatigue testing, we improved the common Lemaitre’s low cycle fatigue damage mechanics model, the damage evolution law that the model describes is in good agreement with the test results throughout the course of the fatigue damage. The simplified analysis method for low cycle fatigue damage evolution and life prediction is proposed based on the GH901 low cycle damage features, the practical method of getting damaged material’s constants by existing data is proposed as well.
Anti-Earthquake Evaluation and Reinforcing of Brick-Concrete Structure Building of an Army in Zhangjiakou
Authors: Yan Jie , Xie Jun , Sun Guo Shuai
Published: January 2015

This article takes an army’s brick-concrete structure building for example to evaluate the safety of the building effectively. It states the points of on-site test, structural calculating analysis and anti-earthquake evaluation and proposes the reinforcing design plan based on comprehensive Assessment.
Experimental Research on Seismic Behavior of I-Section Composite Shear Wall with Steel Plate Reinforced Concrete
Authors: Zhang You Jia
Published: January 2015

In order to study the seismic performance of low shear-span ratio composite shear wall with steel plate reinforced concrete,three low shear-span ratio composite shear walls with steel plate reinforced concrete were tested.The deformation performance and failure modes were observed under low cyclic lateral loads with high axial compression ratio.Valuable results were obtained for the hysteretic curves,skeleton curves,ductility and energy dissipation capacity.The results indicate that the elastic stage, Specimen stiffness value is larger, and the stiffness change is basically the same; The specimen into the elastic-plastic stage, cracks have appeared in basic beam and early damage. The junction of steel concrete structure and reinforced concrete structure are prone to failure, which should improve the reinforced concrete shear stiffness in the design.
Experimental Study on the Compressive Strength of Cement Mortar
Authors: Yuan Yong Quan , Jiang Xue Liang , Zhu Zhong Lin , Chen Jiang
Published: January 2015

Cement mortar is an ideal similar material. In this paper,by using cement, sand and other materials to make the M5, M7.5, M10 three strength grades cement mortar, the effect of water cement ratio and cement dosage on the strength of cement mortar was studied. The changing rule of the cement mortar strength along with age was also analyzed.Through the test, the mortar mixture ratio that was consistent with the original rock mechanical properties was determined ultimately.
The Effect of Concrete Cracks on Chloride Erosion
Authors: Chen Yu , Xu Zhao Hui , Liu Rong Gui
Published: January 2015

To explore the effect of concrete cracks on chloride erosion, different dry-wet cycle immersion experiment for bending cracking component is designed. The chloride content in concrete is tested by using the method of RCT in simulated marine environment. It is showed that the chloride convection diffusion zone depth in the cracking component is between 15mm and 25mm. The chloride erosion process is accelerated by macro-cracks. According to experiment result, a new chloride time-dependent diffusion model is put forward, considering crack width and effective diffusion coefficient. It is found that the chloride concentration is increased with the increase of crack width, approaching to the saturated concentration.
The Influence of Modified Natural Records on Seismic Response of Reinforced Concrete Structure
Authors: An Dong , Qu Tie Jun
Published: January 2015

The choice of input ground motion in the evaluation of the seismic response is a complicated task. The ground motion parameters need to be determined by the scope of the analysis and the potential damage of new or existing buildings. This work presents nonlinear dynamic analyses on reinforced concrete frame widely present in China. Input ground motions contain uncertainty and variability comes from both natural recordings and modified ones. Magnitude scaling and spectrum matching are used in this study. Nonlinear dynamic analyses of reinforced concrete buildings simulated by SeismoStruct and OpenSEES are carried out to evaluate the seismic response. Findings from the investigation indicate that spectrum matching is generally stable and shows good performance in response prediction.
Extended BP Network-Based Pavement and Road Settlement Prediction
Authors: Wang Jing
Published: January 2015

In recent years, many approaches were proposed to deal with the settlement prediction problem. However, because of the complexity of geography and other conditions, the current solutions still have some deficiencies and do not work well. To improve the accuracy of settlement prediction, the authors of this paper propose an extended BP network-based approach. This method first designed the model of BP network according to the dataset. This network includes one input layer, one output layer, one middle layer and an extended middle layer. After trained by samples, this network is used to predict the settlement value. The experiment indicates that our approach is available and work well in most situations.
Acoustical Design Study on Application of Absorption Materials
Authors: Lin Wei , Chiang Wei Hwa
Published: January 2015

Taipei Top Church Auditorium is a hall primarily intended for praise and worship. A three dimensional ray tracing computer simulation was used to provide sound energy distribution on the audience area of the hall, realistic design have been performed. The volume of the hall is 24600m3, which is occupied for 2200 people and equipped the hall with acoustical curtains by modifying its acoustical characteristics. Objective measurements of impulse response are reported, and background noise control and noise isolation are also be considered in the design phase. Reinforcement system is conducted to meet all the activity for the acoustical environments.
Design and Research of Prestressed Anchor Wind Turbine Foundation
Authors: Qin Li , Yang Xiao Yu , Li Long , Zhang Pei Jie
Published: January 2015

The type selection and design of the wind turbine foundation play a vital role in reducing the structure cost and guaranteeing the safety of the wind turbine operation. Using a new type of beam slab foundation as the research object, this study designs the prestressed anchor beam slab foundation, and optimizes the size of the former designing scheme by using Ansys finite element software, hope to be helpful for the relevant research and design reference.