期刊文献+
共找到2,893篇文章
< 1 2 145 >
每页显示 20 50 100
Effect of motivational interviewing on postoperative weight control in patients with obstructive sleep apnea-hypopnea syndrome 被引量:5
1
作者 Xiang-Hong Sun Peng-Shi Xue +1 位作者 Xiang-Xiu Qi Ling Fan 《World Journal of Clinical Cases》 SCIE 2020年第15期3209-3217,共9页
BACKGROUND Obesity is an important factor to cause the obstructive sleep apnea-hypopnea syndrome(OSAHS).Higher body mass index(BMI)often results in more severe OSAHS.Currently,the common measures for controlling the w... BACKGROUND Obesity is an important factor to cause the obstructive sleep apnea-hypopnea syndrome(OSAHS).Higher body mass index(BMI)often results in more severe OSAHS.Currently,the common measures for controlling the weight mainly include diet control,increase exercise and so on.Motivational interviewing(MI)could explore the patient’s internal state and make the patient realize his/her ambivalence,resulting in the change in his/her behavior.This process emphasizes respecting the patient’s autonomy.AIM To evaluate the effect of MI on the weight control of patients with OSAHS.METHODS A randomized controlled study was conducted in 100 obese OSAHS patients undergoing surgical treatment at Shengjing Hospital of China Medical University.The patients were divided into an intervention group and a control group,with 50 cases each.The control group was given routine health education after the operation;in addition to the regular health education,the intervention group was given MI according to a predetermined plan.Obesity-related indicators,postoperative complications,and the sleep status of both groups were evaluated before and 6 mo after the intervention.RESULTS Patients in the intervention group had significantly improved body weight,BMI,and waist and neck circumferences compared with patients in the control group(P<0.05).Regarding complications at 6 mo after operation,the incidence of cough and reflux in patients in the intervention group was significantly lower than that in the control group(P<0.05).In addition,the Epworth Sleepiness Scale and Self-Rating Scale of Sleep scores of patients in the intervention group were significantly lower than those in the control group,and the sleep status of patients in the intervention group was improved(P<0.05).CONCLUSION MI intervention has a significant advantage over postoperative routine health education.It can greatly change the lifestyle,further control the postoperative weight,reduce the occurrence of complications,improve the quality of sleep,and improve long-term postoperative efficacy in OSAHS patients. 展开更多
关键词 Obstructive sleep apnea-hypopnea syndrome POSTOPERATIVE weight control Motivational interview Quality of sleep PATIENTS
下载PDF
Positioning-control Based on Trapezoidal Velocity Curve for High-precision Basis Weight Control Valve 被引量:3
2
作者 Bo Wang Wei Tang +1 位作者 JiXian Dong Feng Wang 《Paper And Biomaterials》 2017年第2期42-50,共9页
Traditionally, basis weight control valve is driven by a constant frequency pulse signal. Therefore, it is difficult for the valve to match the control precision of basis weight. Dynamic simulation research using Matl... Traditionally, basis weight control valve is driven by a constant frequency pulse signal. Therefore, it is difficult for the valve to match the control precision of basis weight. Dynamic simulation research using Matlab/Simulink indicates that there is much more overshoot and fluctuating during the valve-positioning process. In order to improve the valve-positioning precision, the control method of trapezoidal velocity curve was studied. The simulation result showed that the positioning steady-state error was less than 0.0056%, whereas the peak error was less than 0.016% by using trapezoidal velocity curve at 10 positioning steps. A valve-positioning precision experimental device for the stepper motor of basis weight control valve was developed. The experiment results showed that the error ratio of 1/10000 positioning steps was 4% by using trapezoidal velocity curve. Furthermore, the error ratio of 10/10000 positioning steps was 0.5%. It proved that the valve-positioning precision of trapezoidal velocity curve was much higher than that of the constant frequency pulse signal control strategy. The new control method of trapezoidal velocity curve can satisfy the precision requirement of 10000 steps. 展开更多
关键词 high-precision basis weight control valve precision positioning control trapezoidal velocity curve Matlab/Simulink simulation
下载PDF
Novel Parameter Identification Method for Basis Weight Control Loop of Papermaking Process 被引量:3
3
作者 Yunzhu Shen Wei Tang Yungang Liu 《Paper And Biomaterials》 CAS 2023年第1期35-49,共15页
The basis weight control loop of the papermaking process is a non-linear system with time-delay and time-varying.It is impractical to identify a model that can restore the model of real papermaking process.Determining... The basis weight control loop of the papermaking process is a non-linear system with time-delay and time-varying.It is impractical to identify a model that can restore the model of real papermaking process.Determining a more accurate identification model is very important for designing the controller of the control system and maintaining the stable operation of the papermaking process.In this study,a strange nonchaotic particle swarm optimization(SNPSO)algorithm is proposed to identify the models of real papermaking processes,and this identification ability is significantly enhanced compared with particle swarm optimization(PSO).First,random particles are initialized by strange nonchaotic sequences to obtain high-quality solutions.Furthermore,the weight of linear attenuation is replaced by strange nonchaotic sequence and the time-varying acceleration coefficients and a mutation rule with strange nonchaotic characteristics are utilized in SNPSO.The above strategies effectively improve the global and local search ability of particles and the ability to escape from local optimization.To illustrate the effectiveness of SNPSO,step response data are used to identify the models of real industrial processes.Compared with classical PSO,PSO with timevarying acceleration coefficients(PSO-TVAC)and modified particle swarm optimization(MPSO),the simulation results demonstrate that SNPSO has stronger identification ability,faster convergence speed,and better robustness. 展开更多
关键词 basis weight control system PAPERMAKING system identification particle swarm optimization strange nonchaotic sequence
下载PDF
PSO-based Parameter Tuning for a TwoDegree-of-Freedom IMC Scheme and Its Application to Paper Basis Weight Control 被引量:4
4
作者 Wei Tang Zhimin Yuan +1 位作者 Wenjuan Shan MdMuhie Menul Haque 《Paper And Biomaterials》 2019年第4期57-63,共7页
Basis weight is an important indicator for evaluating paper quality and a major factor directly affecting the economic benefits of enterprises.Focusing on the large time-delay,time-varying,and nonlinear characteristic... Basis weight is an important indicator for evaluating paper quality and a major factor directly affecting the economic benefits of enterprises.Focusing on the large time-delay,time-varying,and nonlinear characteristics of a basis weight control system,a two-degree-of-freedom(TDF)internal model control(IMC)method based on a particle swarm optimization(PSO)algorithm was proposed.The method took the integral of time multiplied by the absolute error(ITAE)as the objective function,and the PSO algorithm was used to optimize the time constant of the tuning IMC filter.The simulation results for the control system under the proposed TDF-IMC method based on the PSO algorithm demonstrate good set-point tracking performance,strong anti-interference capabilities,and good robustness properties.The application results revealed that the basis weight fluctuation range of the paper was±2 g/m2,which significantly improved both the control quality and the product quality. 展开更多
关键词 basis weight control system large time delay IMC two-degreeof FREEDOM control PSO algorithm
下载PDF
Access Request Trustworthiness in Weighted Access Control Framework 被引量:1
5
作者 WANGLun-wei LIAOXiang-ke WANGHuai-min 《Wuhan University Journal of Natural Sciences》 EI CAS 2005年第1期65-69,共5页
Weighted factor is given to access eontrol policies to express the importanceof policy and its effect on access control decision. According to this weighted access controlframework, a trustworthiness model for aceess ... Weighted factor is given to access eontrol policies to express the importanceof policy and its effect on access control decision. According to this weighted access controlframework, a trustworthiness model for aceess request is also given. In this model, we give themeasure of trustworthiness factor to access request- by using some idea of uncertainty reasoning ofexpert system, present and prove the parallel propagation formula of request trustworthiness factoramong multiple policies, and get thefinal trustworthiness factor to decide whether authorizing. Inthis model, authorization decision is given according to the calculation of request trustworthinessfactor, which is more understandable, more suitable for real requirement and more powerfulforsecurity enhancement than traditional methods. Meanwhile the finer access control granularity isanother advantage. 展开更多
关键词 weighted factor access control framework access request trustworthiness
下载PDF
Determinant of Low Birth Weight Infants: A Matched Case Control Study 被引量:3
6
作者 Rosnah Sutan Mazlina Mohtar +1 位作者 Aimi Nazri Mahat Azmi Mohd Tamil 《Open Journal of Preventive Medicine》 2014年第3期91-99,共9页
Background: Low birth weight (LBW) is a well-known factor associated with neonatal mortality and has contributed to a range of poor health outcomes. Thus, the objective of this study was to determine factors associate... Background: Low birth weight (LBW) is a well-known factor associated with neonatal mortality and has contributed to a range of poor health outcomes. Thus, the objective of this study was to determine factors associated with LBW infants. Methods: A matched case control study was conducted in Universiti Kebangsaan Malaysia. Data of deliveries were obtained from Total Hospital Information System and medical records. All registered deliveries from January to June 2012 were used as sample populations. There were 180 pairs of cases and controls matched on babies’ gender. Fourteen variables were analyzed: maternal age, ethnicity, gravida, parity, gestational age, maternal booking weight, height and body mass index (BMI), history of low birth weight infants, birth interval, booking hemoglobin levels, hypertension, diabetes mellitus and mode of delivery. Results: Younger mother (t = 6.947, p < 0.001), lower booking BMI (t = 3.067, p = 0.002), prematurity (t = 12.324, p < 0.001), history of LBW infants (OR = 3.0, p = 0.001), LSCS (OR = 0.06, p = 0.001) and current hypertension (OR = 3.1, p = 0.008) were found significant in bivariate analysis. Multivariable conditional logistic regression identified younger maternal age (AOR = 2.9, 95% CI = 1.86 -4.51, p 13.58, p = 0.045), prematurity (AOR = 2.4, 95% CI = 1.79 -3.26, p < 0.001), and current hypertension (AOR = 4.5, 95% CI = 1.06 -19.22, p = 0.041) as significant factors associated with LBW infants. Conclusion: Younger maternal age, history of LBW infants, prematurity and hypertension have been recognized as predictors of LBW infants. The importance of pre-pregnancy screening, early antenatal booking and proper identification of high risk-mother needs to be strengthened and enforced in effort to reduce incidence of LBW infants. 展开更多
关键词 Low BIRTH weight MATERNAL FACTORS Matched CASE control
下载PDF
A Neural Network Controller for Basis-weight Control of Papermaking Processes
7
作者 胡恒章 沈毅 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 1996年第1期29-33,共5页
ANeuralNetworkControllerforBasis-weightControlofPapermakingProcessesHUHengzhang;SHENYi(胡恒章);(沈毅)(Dept.ofCont... ANeuralNetworkControllerforBasis-weightControlofPapermakingProcessesHUHengzhang;SHENYi(胡恒章);(沈毅)(Dept.ofControlEngineering,Ha... 展开更多
关键词 ss: NEURAL networks BASIS weight control long system response delay PAPERMAKING process
下载PDF
Parameters optimization for exponentially weighted moving average control chart using generalized regression neural network
8
作者 梁宗保 《Journal of Chongqing University》 CAS 2006年第3期131-136,共6页
As a useful alternative of Shewhart control chart, exponentially weighted moving average (EWMA) control chat has been applied widely to quality control, process monitoring, forecast, etc. In this paper, a method was... As a useful alternative of Shewhart control chart, exponentially weighted moving average (EWMA) control chat has been applied widely to quality control, process monitoring, forecast, etc. In this paper, a method was introduced for optimal design of EWMA and multivariate EWMA (MEWMA) control charts, in which the optimal parameter pair ( λ, k) or ( λ, h ) was searched by using the generalized regression neural network (GRNN). The results indicate that the optimal parameter pair can be obtained effectively by the proposed strategy for a given in-control average running length (ARLo) and shift to detect under any conditions, removing the drawback of incompleteness existing in the tables that had been reported. 展开更多
关键词 parameter optimization exponentially weighted moving average control chart generalized regression neural network
下载PDF
The Relationship Between Weights and Control Vertices of Two Rational NURBS Curves Representing the Same Curve Parametrically and Geometrically
9
作者 冯仁忠 王仁宏 罗钟铉 《Northeastern Mathematical Journal》 CSCD 2003年第1期68-74,共7页
The paper discusses the relationship between weights and control vertices of two rational NURBS curves of degree two or three with all weights larger than zero when they represent the same curve parametrically and geo... The paper discusses the relationship between weights and control vertices of two rational NURBS curves of degree two or three with all weights larger than zero when they represent the same curve parametrically and geometrically, and gives sufficient and necessary conditions for coincidence of two rational NURBS curves in non-degeneracy case. 展开更多
关键词 rational NURBS curve weight control vertex
下载PDF
Risk Factors for Low Birth Weight and Preterm Birth:A Population-based Case-control Study in Wuhan,China 被引量:3
10
作者 汪静 曾云 +6 位作者 倪泽敏 王姽 刘淑运 李灿 余朝利 王齐 聂绍发 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2017年第2期286-292,共7页
Low birth weight(LBW) and preterm birth(PB) are associated with newborn mortality and diseases in adulthood.We explored factors related to LBW and PB by conducting a population-based case-control study from Januar... Low birth weight(LBW) and preterm birth(PB) are associated with newborn mortality and diseases in adulthood.We explored factors related to LBW and PB by conducting a population-based case-control study from January 2011 to December 2013 in Wuhan,China.A total of 337 LBW newborn babies,472 PB babies,and 708 babies with normal birth weights and born from term pregnancies were included in this study.Information of newborns and their parents was collected by trained investigators using questionnaires and referring to medical records.Univariate and logistic regression analyses with the stepwise selection method were used to determine the associations of related factors with LBW and PB.Results showed that maternal hypertension(OR=6.78,95% CI:2.27–20.29,P=0.001),maternal high-risk pregnancy(OR=1.53,95% CI:1.06–2.21,P=0.022),and maternal fruit intake ≥300 g per day during the first trimester(OR=1.70,95% CI:1.17–2.45,P=0.005) were associated with LBW.BMI ≥24 kg/m^2 of mother prior to delivery(OR=0.48,95% CI:0.32–0.74,P=0.001) and gestation ≥37 weeks(OR=0.01,95% CI:0.00–0.02,P〈0.034) were protective factors for LBW.Maternal hypertension(OR=3.36,95% CI:1.26–8.98,P=0.016),maternal high-risk pregnancy(OR=4.38,95% CI:3.26–5.88,P〈0.001),maternal meal intake of only twice per day(OR=1.88,95% CI:1.10–3.20,P=0.021),and mother liking food with lots of aginomoto and salt(OR=1.60,95% CI:1.02–2.51,P=0.040) were risk factors for PB.BMI ≥24 kg/m^2 of mother prior to delivery(OR=0.66,95% CI:0.47–0.93,P=0.018),distance of house from road ≥36 meters(OR=0.72,95% CI:0.53– 0.97,P=0.028),and living in rural area(OR= 0.60,95% CI:0.37–0.99,P=0.047) were protective factors for PB.Our study demonstrated some risk factors and protective factors for LBW and PB,and provided valuable information for the prevention of the conditions among newborns. 展开更多
关键词 case-control low birth weight newborn preterm birth risk factors
下载PDF
PI control based on fuzzy set-point weighting tracking for hydraulic crane boom system
11
作者 Yong YANG An LUO Karl-Erik RYDBERG 《控制理论与应用(英文版)》 EI 2006年第4期327-330,共4页
A PI control strategy based on fuzzy set-point weighting following was proposed for the active damping control of a hydraulic crane boom system (HCBS). Two valve-controlled PI controllers, which include a proportion... A PI control strategy based on fuzzy set-point weighting following was proposed for the active damping control of a hydraulic crane boom system (HCBS). Two valve-controlled PI controllers, which include a proportional feedforward controller based on fuzzy set-point weighting following and a limited semi-integrator(LSI), are designed respectively. LSI is used to limit output signal and to prevent wind up at the low frequency of the spectrum. By using a range camera and an electronic feedback control, the tip damping on the HCBS can be adjusted artificially. A collaborative control simulation technique of HOPSAN and MATLAB/SIMULINK is applied to the controller design. Simulation results show that the proposed PI control system has less overshoot as well as faster response. The tip damping on the HCBS during operation is improved. 展开更多
关键词 PI control Fuzzy set-point weighting (FSPW) Limited semi-integrator(LSI) Active damping Collaborative control simulation Range camera Hydraulic crane boom system (HCBS)
下载PDF
Short term acupressure therapy on weight-reduction in adolescence: A randomized controlled trial
12
作者 Ching-Hsiu Hsieh Pei-Ying Chuang +1 位作者 Li-Huan Chen Han-Wen Wang 《Health》 2013年第8期81-84,共4页
Aim: Common treatment options for obesity include a reduced-calorie diet, increased physical activity, behavioral modification, pharmacotherapy, and surgery. Ear acupressure may also be an effective adjunct therapy. M... Aim: Common treatment options for obesity include a reduced-calorie diet, increased physical activity, behavioral modification, pharmacotherapy, and surgery. Ear acupressure may also be an effective adjunct therapy. Methods: This study used a randomized controlled design to test the effectiveness of auricular acupressure for weight reduction in young, Taiwan Residents adults with a BMI ≥ 23 kg/m2. Sixty-eight participants aged 18 to 20 years were recruited from Taiwan Residents universities at the beginning of the study. After four weeks of auricular therapy, the total sample included 57 young adults. All participants met one time per week for ten minutes. The treatment group received ear acupressure treatment with Semen Vaccariae sticks on auricular acupoints while the control group had adhesive tape placed on ear acupoints, change in BMI from baseline to trial completion. Results: BMI in controls increased significantly by +0.0133 kg/m2 (P = 0.000) while the intervention group BMI decreased significantly by ?0.8022 kg/m2 (P ≤ 0.0001). Conclusions: Just four weeks of auricular acupressure by Semen Vaccariae, sticks may significantly help to decrease BMI among young adults. 展开更多
关键词 Aurpressure Therapy weight-Reduction AURICULAR ACUPOINT RANDOMIZED controlled Trial BMI
下载PDF
The Benefits of SGLT2 Inhibitors in Cardiovascular Prevention, Glycemic Control and Weight Loss, in the Treatment of Diabetes 被引量:1
13
作者 Bruna de Souza Faustino Alberto dos Reis Costa Junior +3 位作者 Letícia Nascimento Medeiros Bortolon Larissa Bianca Paiva Cunha de Sá Denise Rosso Tenório Wanderley Rocha Alberto Krayyem Arbex 《Open Journal of Endocrine and Metabolic Diseases》 2016年第1期87-94,共8页
The sodium and glucose co-transporter inhibitors type 2 (SGLT2) comprises a new class of hypoglycemic drugs to control type 2 diabetes mellitus, in an attempt to add new non-existing benefits to the so far arising cla... The sodium and glucose co-transporter inhibitors type 2 (SGLT2) comprises a new class of hypoglycemic drugs to control type 2 diabetes mellitus, in an attempt to add new non-existing benefits to the so far arising classes. Regarding this new class of drugs, represented by dapaglifozin, canaglifozin and empaglifozin, it is important to highlight the benefits brought by these medications to combat hyperglycemia with insulin-independent mechanisms that are beyond glucose reduction, such as cardiovascular events prevention, reduction in HbA1c, weight loss and blood pressure lowering. Recently, a relevant study (Empa-Reg) brought hope and set the spotlight on the prevention of cardiac events among diabetic patients, which is the main cause of mortality within this group. However, despite coming out as a good treatment option, SGLT2 inhibitors are under constant clinical research and, as a new drug, it should be carefully carried out regarding the long-term effects of glycosuria and other possible side effects, such as the observed increase in the incidence of bladder, breast cancer and bone fractures, which require further studies. Therefore, these compounds might represent a landmark approach for the treatment of diabetes. 展开更多
关键词 DIABETES SGLT-2 Inhibitor Glycemic control Cardiovascular Risk Empa-Reg Side Effects weight Loss
下载PDF
Wide-Area Delay-Dependent Adaptive Supervisory Control of Multi-machine Power System Based on Improve Free Weighting Matrix Approach
14
作者 Ziyong Zhang Zhijian Hu +3 位作者 Yukai Liu Yang Gao He Wang Jianglei Suo 《Energy and Power Engineering》 2013年第4期435-441,共7页
The paper demonstrates the possibility to enhance the damping of inter-area oscillations using Wide Area Measurement (WAM) based adaptive supervisory controller (ASC) which considers the wide-area signal transmission ... The paper demonstrates the possibility to enhance the damping of inter-area oscillations using Wide Area Measurement (WAM) based adaptive supervisory controller (ASC) which considers the wide-area signal transmission delays. The paper uses an LMI-based iterative nonlinear optimization algorithm to establish a method of designing state-feedback controllers for power systems with a time-varying delay. This method is based on the delay-dependent stabilization conditions obtained by the improved free weighting matrix (IFWM) approach. In the stabilization conditions, the upper bound of feedback signal’s transmission delays is taken into consideration. Combining theoriesof state feedback control and state observer, the ASC is designed and time-delay output feedback robust controller is realized for power system. The ASC uses the input information from Phase Measurement Units (PMUs) in the system and dispatches supplementary control signals to the available local controllers. The design of the ASC is explained in detail and its performance validated by time domain simulations on a New England test power system (NETPS). 展开更多
关键词 ADAPTIVE Supervisory controller (ASC) DELAY-DEPENDENT Damping control Power Oscillation IFWM LMI Free weighting Matrix APPROACH TIME-VARYING Delay WAMS
下载PDF
V-BILIPSCHITZ DETERMINACY OF WEIGHTED HOMOGENEOUS ANALYTIC FUNCTION-GERMS ON WEIGHTED HOMOGENEOUS REAL ANALYTIC VARIETIES 被引量:1
15
作者 刘恒兴 张敦穆 《Acta Mathematica Scientia》 SCIE CSCD 2010年第4期1249-1256,共8页
In this article, we provide estimates for the degree of V bilipschitz determinacy of weighted homogeneous function germs defined on weighted homogeneous analytic variety V satisfying a convenient Lojasiewicz condition... In this article, we provide estimates for the degree of V bilipschitz determinacy of weighted homogeneous function germs defined on weighted homogeneous analytic variety V satisfying a convenient Lojasiewicz condition.The result gives an explicit order such that the geometrical structure of a weighted homogeneous polynomial function germs is preserved after higher order perturbations. 展开更多
关键词 V bilipschitz determinacy weighted homogeneous polynomial function germs controlled vector field weighted homogeneous control functions
下载PDF
Weighted average consensus problem in networks of agents with diverse time-delays 被引量:4
16
作者 Wenhui Liu Feiqi Deng +1 位作者 Jiarong Liang Xuekui Yan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2014年第6期1056-1064,共9页
This paper studies the weighted average consensus problem for networks of agents with fixed directed asymmetric unbalance information exchange topology. We suppose that the classical distributed consensus protocol is ... This paper studies the weighted average consensus problem for networks of agents with fixed directed asymmetric unbalance information exchange topology. We suppose that the classical distributed consensus protocol is destroyed by diverse time-delays which include communication time-delay and self time-delay. Based on the generalized Nyquist stability criterion and the Gerschgorin disk theorem, some sufficient conditions for the consensus of multi-agent systems are obtained. And we give the expression of the weighted average consensus value for our consensus protocol. Finally, numerical examples are presented to illustrate the theoretical results. 展开更多
关键词 networks of agents distributed control weighted average consensus TIME-DELAY digraph theory
下载PDF
Degenerations of rational Bézier surface with weights in the form of exponential function 被引量:1
17
作者 ZHANG Yue ZHU Chun-gang GUO Qing-jie 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2017年第2期164-182,共19页
Rational Bezier surface is a widely used surface fitting tool in CAD. When all the weights of a rational B@zier surface go to infinity in the form of power function, the limit of surface is the regular control surface... Rational Bezier surface is a widely used surface fitting tool in CAD. When all the weights of a rational B@zier surface go to infinity in the form of power function, the limit of surface is the regular control surface induced by some lifting function, which is called toric degenerations of rational Bezier surfaces. In this paper, we study on the degenerations of the rational Bezier surface with weights in the exponential function and indicate the difference of our result and the work of Garcia-Puente et al. Through the transformation of weights in the form of exponential function and power function, the regular control surface of rational Bezier surface with weights in the exponential function is defined, which is just the limit of the surface. Compared with the power function, the exponential function approaches infinity faster, which leads to surface with the weights in the form of exponential function degenerates faster. 展开更多
关键词 rational Bezier surface weightS regular control surface toric degenerations exponential function.
下载PDF
Adding body load modifies the vibratory sensation of the foot sole and affects the postural control 被引量:1
18
作者 Yves Jammes Eva Ferrand +2 位作者 Corentin Fraud Alain Boussuges Jean Paul Weber 《Military Medical Research》 SCIE CAS CSCD 2019年第1期60-66,共7页
Background: Heavy backpacks are often used by soldiers and firefighters. Weight carrying could reduce the speed and efficiency in task completion by altering the foot sole sensitivity and postural control.Methods: In ... Background: Heavy backpacks are often used by soldiers and firefighters. Weight carrying could reduce the speed and efficiency in task completion by altering the foot sole sensitivity and postural control.Methods: In fifteen healthy subjects, we measured the changes in sensitivity to vibrations applied to the foot sole when standing upright or walking after load carrying(30% body weight). The participants were asked to judge different vibration amplitudes applied on the 2 nd or 5 th metatarsal head and the heel at two frequencies(25 and 150 Hz) to determine the vibration threshold and the global perceptual representation(Ψ)of the vibration amplitude(Φ)given by the Stevens power function(Ψ=k×Φ~n). Any increase in negative k value indicated a reduction in sensitivity to the lowest loads. Pedobarographic measurements, with computation of the center of pressure(COP) and its deviations, were performed during weight carrying.Results: The 25-Hz vibration threshold significantly increased after weight carrying when standing upright or walking.After standing with the added loads, the absolute negative k value increased for the 25 Hz frequency. After walking with the added loads, the k coefficient increased for the two vibration frequencies. Weight carrying significantly increased both the CoP surface and CoP lateral deviation.Conclusions: Our data show that weight carrying reduces the sensory pathways from the foot sole and accentuates the center of pressure deviations. 展开更多
关键词 FOOT SOLE sensitivity Vibration weight carrying POSTURAL control
下载PDF
Evaluation of New Formulation of Oxyfluorfen (23.5% EC) for Weed Control Efficacy and Bulb Yield in Onion 被引量:1
19
作者 Sathya Priya Ramalingam Chinnusamy Chinnagounder +1 位作者 Manickasundaram Perumal Murali Arthanari Palanisamy 《American Journal of Plant Sciences》 2013年第4期890-895,共6页
A field experiment were conducted for two years at Agricultural Research Station, Bhavanisagar of Tamil Nadu Agricultural University, during kharif season of 2009 and 2010 to evaluate the new formulation of oxyfluorfe... A field experiment were conducted for two years at Agricultural Research Station, Bhavanisagar of Tamil Nadu Agricultural University, during kharif season of 2009 and 2010 to evaluate the new formulation of oxyfluorfen (23.5% EC) on weed control in onion. Weeds constitute one of the biggest problems in agriculture that not only reduce the yield and quality of onion but also utilize essential nutrients. Hence, weed control is essential for increasing onion production. Based on two years field experimentation, it was found that pre-emergence application of oxyfluorfen (23.5% EC) at400 g.ha-1 gave significantly lower total weed density, weed dry weight and higher weed control efficiency at all the intervals. Application of new formulation of oxyfluorfen (23.5% EC) at200 g.ha-1 as pre-emergence herbicide can keep the weed density and dry weight below the economic threshold level and increase the bulb weight (42.56 and43.87 g) and yield (15940 and15610 kg.ha-1) in onion. Unweeded control accounted for lower bulb yield which inturn reflected through higher weed index of 60.6 and 56.1 per cent, respectively during both the years, due to heavy competition of weeds for nutrients, space and light. 展开更多
关键词 WEED Density Dry weight WEED control Efficiency WEED Index BULB Yield
下载PDF
Nitroxide-Mediated Photo-Controlled/Living Radical Polymerization of Methacrylic Acid 被引量:1
20
作者 Eri Yoshida 《Open Journal of Polymer Chemistry》 2013年第1期16-22,共7页
The photo-controlled/living radical polymerization of methacrylic acid (MAA) was performed at room temperature by irradiation with a high-pressure mercury lamp using azo initiators and 4-methoxy-2,2,6,6-tetramethylpip... The photo-controlled/living radical polymerization of methacrylic acid (MAA) was performed at room temperature by irradiation with a high-pressure mercury lamp using azo initiators and 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl as the mediator in the presence of (4-tert-butylphenyl)diphenylsulfonium triflate (tBuS) as the accelerator. Whereas the bulk polymerization yielded polymers with a bimodal molecular weight distribution in both the absence and presence of tBuS, the solution polymerization in methanol produced unimodal polymers with the molecular weight distribution of 2.0 - 2.3 in the presence of tBuS. The molecular weight distribution of the resulting poly (MAA) decreased with an in- crease in tBuS. The dilution of the monomer concentration also reduced the molecular weight distribution. The use of the initiator with a low 10-h half-life temperature also effectively controlled the molecular weight. The livingness of the polymerization was confirmed by obtaining linear increases in the first-order conversion versus time, the molecular weight versus the conversion, and the molecular weight versus the reciprocal of the initiator concentration. 展开更多
关键词 Photo-controlled/Living Radical POLYMERIZATION Nitroxide-Mediated POLYMERIZATION Methacrylic Acid 4-Methoxy-2 2 6 6-Tetramethylpiperidine-1-Oxyl (4-Tert-butylphenyl)diphenylsulfonium TRIFLATE Molecular weight control
下载PDF
上一页 1 2 145 下一页 到第
使用帮助 返回顶部