Light cannot be propagated within the range of photonic crystal band gaps. Based on this unique property, we proposed a method to improve anti-radiation capability through one-dimensional photonic crystal coating. Using transmission matrix method, we determined the appropriate dielectric materials, thickness and periodic numbers of photonic crystals through Matlab programming simulation. Then, compound one-dimensional photonic crystal coating was designed which was of high anti-radiation rate within the range of X-ray. As is shown through simulation experiments, the reflection rate against X-ray was higher than 90 percent, and the desired anti-radiation effect was achieved. Thus, this method is able to help solve the technical problems facing the inorganic lead glass such as thickness, weightiness, costliness, high lead equivalent, low transparency and high cost. This method has won China's national invention patent approval, and the patent number is 201220228549.2.
In order to provide a reference and theoretical guidance of the evaluation of electronic medical record (EMR) and establishment of evaluation system in China, we applied a bibliometric analysis to assess the application of methodologies used at home and abroad, as well as to summarize the advantages and disadvantages of them. We systematically searched international medical databases of Ovid-MEDLINE, EBSCOhost, EI, EMBASE, PubMed, IEEE, and China's medical databases of CBM and CNKI between Jan.1997 and Dec.2012. We also reviewed the reference lists of articles for relevant articles. We selected some qualified papers according to the pre-established inclusion and exclusion criteria, and did information extraction and analysis to the papers. Eventually, 1 736 papers were obtained from online database and other 16 articles from manual retrieval. Thirty-five articles met the inclusion and exclusion criteria and were retrieved and assessed. In the evaluation of EMR, US counted for 54.28% in the leading place, and Canada and Japan stood side by side and ranked second with 8.58%, respectively. For the application of evaluation methodology, Information System Success Model, Technology Acceptance Model (TAM), Innovation Diffusion Model and Cost-Benefit Access Model were widely applied with 25%, 20%, 12.5% and 10%, respectively. In this paper, we summarize our study on the application of methodologies of EMR evaluation, which can provide a reference to EMR evaluation in China.
ObjectiveTo investigate the situation of tuberculosis (TB) infection in primary and middle school students and to provide scientific basis for TB prevention and control in Nyingchi. MethodsPrimary and middle school students in Nyingchi were investigated from 2006 to 2008 using a questionnaire, and purified protein derivative (PPD) tests were carried out among the sampling students. Data analysis was conducted by SPSS 13.0. ResultsIn 3 987 included primary and middle students, the positive, strongly positive and overall positive rates of PPD were 11.4%, 5.1%, 16.5%, respectively. Five patients with TB were found in the investigation, and the prevalence was 125.4 per 100 000. The positive and strongly positive rates were 11.3% and 4.4% in male, 11.5% and 5.7% in female, respectively. The positive and strongly positive rates were 6.9% and 3.9% in primary school students, 18.8%, 7.1% in middle school students, respectively. Both the positive rate and strongly positive rate in middle school students were higher than those in primary school students (P < 0.05). The positive rates in town, village and floating population were 16.5%, 9.5%, 8.9%, respectively, and their strongly positive rates were 6.1%, 4.8%, 1.4%, respectively. Both the positive rate and strongly positive rate in town were higher than those in village and floating population (P < 0.05). The strongly positive rates in Tibetan, the Han nationality and other ethnic minorities were 5.2%, 4.0%, 6.0%, respectively. The strongly positive rates in Tibetan and other ethnic minorities were higher than those in the Han nationality (P < 0.05). ConclusionThe infection and prevalence rate of TB of primary and middle school students in Nyingchi are fairly high. TB prevention and control for the high-risk populations should be strengthened in primary and middle schools in Nyingchi.
ObjectiveTo understand the inpatient classification and influence factors of hospitalization expenses, so as to provide basis for hospital management. MethodsThe diagnosis and treatment data of inpatients in a grade A tertiary hospital in 2013 were collected, the percentile method were used to describe the expenses distribution, the K-means clustering method was applied to classify the inpatients, the rank-sum test was utilized to analyze the differences of the costs among different groups, ICD-10 was applied to analyze the diseases distribution, and the median regression was used to analyze the influence factors. ResultsThere were 175 333 inpatients in total. The median of the expenses was 10 016.31 yuan RMB. The inpatients might be classified into seven groups with different expenses (P=0.0001). For inpatients who had no "blood transfusion cost", the top three factors of cost category were operation, laboratory test, examination; for who had "blood transfusion cost", the top three factors of cost category were blood transfusion, laboratory test, examination. There were 2 147, 2 182, 1 499, 1 301, 2 059, 22 and 14 kinds of diseases (ICD-10 four-digit code) respectively among the seven groups. The influence factors could be summarized into patient-related and diagnosis & treatment-related ones. ConclusionThe costs of operation, blood transfusion, laboratory test, and examination affect the inpatients classification greatly. The results could be of help to inform the admission of patients, the expense control and the disease management.
It's common that general rules exist in a certain classification. The general rules of expense classification enable us to judge the category of a patient as soon as possible and to curb the expense. Theory of rough set helps us reach the best reduction of attributes. Based on the core attributes, classification rules are put forward by value reduction. The results show that 10 core attributes remain in 21 attributes of 1527 inpatients' information and 76 classification rules are founded. All of 76 rules guide classification of the patients. 44 of the 76 rules define the only category of a patient, the other 32 rules defines the potential catagories of a patient. Meanwhile, equal attributes of the same category are summerized to guide the cost control of patients. The results indicate that the theory of rough set is effective in attributes reduction and rule generalization of patient expense classification, and it has important significance on medical practice.
ObjectiveTo explore the diagnostic value of the bedside echocardiogram for different risk stratification of patients with suspected pulmonary embolism. MethodsPatients with suspected pulmonary embolism in the emergency department of the Second Afflicted Hospital Xi'an Jiaotong University between July 2013 to December 2015 were included. According the Wells scores, they were divided into a low risk group (0-2 points), a intermediate risk group (3-6 points) and a high risk group (>6 points). All patients were underwent the bedside echocardiogram diagnosis, and the diagnostic value of the echocardiography for pulmonary embolism, the characteristics of different risk stratification of patients were analyzed by SPSS 18.0 software. Results115 patients with suspected pulmonary embolism were included, of which 20 were in the low risk group, 73 were in the medium risk group, and 22 were in the high risk group. The incidence of pulmonary embolism among the three groups was significantly different (high-risk vs. medium risk vs. low-risk: 90.9% vs. 76.7% vs. 15.0%, P<0.05), and the higher Wells scores gets, the greater possibility of having the pulmonary embolism. For the intermediate-risk group, the incidence of pulmonary embolism was significantly higher in patients with positive ultrasonic results than those with the negative ultrasonic results (87.3% vs. 44.4%, P<0.05). The predication of the ultrasonic positive and the negative in the low and high risk groups had no statistical differences (P>0.05). The result of echocardiogram showed that the right ventricular end-diastolic diameter, right ventricular end-diastolic transverse diameter, right atrial end-diastolic transverse diameter, RV/LV, RA/LA in the high risk group and the intermediate risk group were significantly higher than those in the low risk group (all P values <0.05). The right ventricular anterior wall activity in the low risk group was higher than that in the high risk group (P<0.05), but this difference was not found between the high risk group and the intermediate risk group. ConclusionBedside echocardiogram can be used as the diagnosis and differential diagnosis methods of suspected pulmonary embolism, and it has relatively higher diagnostic value for intermediate to high risk patients predicted by the Wells scores than low risk ones.
Objective To evaluate the biomechanical properties of proximal femoral medial buttress plate (PFMBP) for fixing the reverse oblique intertrochanteric fractures by comparing with proximal femoral locking compression plate (PFLCP) and proximal femoral nail antirotation (PFNA). Methods Eighteen synthetic femoral bone models (Synbone) were divided into 3 groups (group PFLCP, group PFNA, and group PFMBP), 6 models in each group; an AO 31-A3.1 reverse oblique femoral intertrochanteric fracture was made based on the same criterion. After being fixed and embeded, the axial load testing, torsion testing, and axial load-to-failure testing were performed on each model. The axial displacement of different loads, torque of different torsion angles, and failure load of each model were recorded, and the stiffness of axial load and torsion were calculated. Results The axial stiffness in groups PFLCP, PFNA, and PFMBP were (109.42±30.14), (119.13±29.14), and (162.05±22.05) N/mm respectively, showing significant differences between groups (P<0.05). There were significant differences in torque between different torsion angles in the same group, as well as in the torque between groups at the same torsional angle (P<0.05). The torsion stiffness in groups PFLCP, PFNA, and PFMBP were (1.45±0.44), (1.10±0.13), and (1.36±0.32) N·mm/deg respectively; there were significant differences when compared groups PFLCP and PFMBP with group PFNA (P<0.05), but no significant difference was found between group PFLCP and group PFMBP (P>0.05). The failure loads of groups PFLCP, PFNA, and PFMBP were (1 408.88± 0.17), (1 696.56±0.52), and (2 154.65±0.10) N respectively, showing significant differences between groups (P<0.05). Conclusion The newly-designed PFMBP is better than PFNA and PFLCP in axial load stiffness and torsion stiffness for fixing reverse oblique intertrochanteric fracture by biomechanical test, indicating that reconstruction of medial stability is a key element for unstable intertrochanteric fracture.
The aim of this study was to design a simple, economic, with high Common Mode Rejection Ratio (CMRR), preamplifier and multi-channel masticatory muscle surface electromyography (sEMG) signal acquisition system assisting to diagnose temporomandibular disorders (TMD). We used the USB interface technology in the EMG data with the aid of the windows to operate system and graphical interface. Eight patients with TMD and eight controls were analyzed separately using this system. In this system, we analyzed sEMG by an optional combination of time domain, frequency domain, time-frequency, several spectral analysis, wavelets and other special algorithms under multi-parameter. Multi-channel sEMG System of Masticatory Muscles is a simple, economic system. It has high sensitivity and specificity. The sEMG signals were changed in patients with TMD. The system would pave the way for diagnosis TMD and help us to assess the treatment effect. A novel and objective method is provided for diagnosis and treatment of oral-maxillofacial disease and functional reconstruction.
Neurofeedback, as an alternative treatment method of behavioral medicine, is a technique which translates the electroencephalogram (EEG) signals to styles as sounds or animation to help people understand their own physical status and learn to enhance or suppress certain EEG signals to regulate their own brain functions after several repeated trainings. This paper develops a neurofeedback system on the foundation of brain-computer interface technique. The EEG features are extracted through real-time signal process and then translated to feedback information. Two feedback screens are designed for relaxation training and attention training individually. The veracity and feasibility of the neurofeedback system are validated through system simulation and preliminary experiment.
The present paper is aimed to study the effect of sand-therapy with Uyghur medicine on biomechanical properties and femoral bone volume of the femur of osteoarthritis (OA) rabbits at two different ages. In the experiments, we injected Papain through the joint space of right knees into the bodies of New Zealand rabbits (16 in the growing group, and 16 in the mature group), and established an OA model. The 16 rabbits in the mature group were divided randomly into 2 sub-groups: 8 in control group (no sand therapy), and 8 sand-therapy group. The 16 rabbits in the growing group were divided randomly into 2 groups as well: 8 in the control group (no sand therapy), and 8 in the sand-therapy group. We carried out CT scanning four times (1 day before, 13th, 27th and 41st days after the establishment of the model, respectively). After importing the CT data to MIMICS, the different volumes of each sclerotin were recorded and change of the percentage of each sclerotins in total femur bone volume were analyzed. Finally the rabbit femurs were given three-point bending test, the elastic load and the elastic deflection were obtained and the inertia of the section, the maximum bending stresses, the bending modulus of elasticity and the structural rigidity were calculated. The experimental results showed that ① Compared with 1 day before and 13th day after establishment of model at maturity, the cancellous bone volume increased and cortical bone volume decreased (P<0.05), but compared with those in the control group, the cancellous bone volume of femurs decrease and cortical bone volume increased under sand-therapy (P<0.05). Compared with those in the control group, there were no significant changes in the deflection and cross-sectional moment of inertia in the sand-therapy group (P>0.05), but the maximum bending normal stress, maximum load, elastic modulus, and structural stiffness (P<0.05) in the sand therapy group were larger than those in the control group. The study showed that sand-therapy in Uyghur medicine has benign effect on bone volume of the OA rabbit femur in two ages and the mechanical properties of the OA rabbit femur at the two ages induced by sand-therapy in Uyghur medicine have been improved.