Semilinear reaction–diffusion systems of several components

AbstractThe homogeneous Dirichlet boundary value problemuit−Δui=∏j=1nujpij,i=1,2,…,nin a bounded domain Ω⊂RN is considered, where pij⩾0(1⩽i,j⩽n) are constants. Denote by I the identity matrix and P=(pij), which is assumed to be irreducible. We find out that whether or not I−P is a so-called M-matrix plays a fundamental role in the blow-up theorems

Validation of the Oregon Scientific BPU 330 for self-monitoring of blood pressure according to the International Protocol

Li Li1, XinYu Zhang1, ChunHong Yan1, QingXiang Liang21Biomedical Engineering Lab, Faculty of Information Engineering, ShenZhen University, ShenZhen, China; 2Bao An People’s Hospital, ShenZhen, ChinaObjective: Extensive marketing of devices for self-measurement of blood pressure has created a need for purchasers to be able to satisfy themselves that such devices have been evaluated according to agreed criteria. The Oregon Scientific BPU 330 blood pressure monitor is an electronic device for upper arm measurement. This study assessed the accuracy of the Oregon Scientific BPU 330 blood pressure monitor according to the International Protocol by the Working Group on Blood Pressure Monitoring of the European Society of Hypertension for validation of blood pressure measuring devices.Method: 52 participants over 30 years of age were studied in the validation. Nine blood pressure measurements were taken alternately with a mercury sphygmomanometer by two observers, and by the supervisor, using the BPU 330 device. A total of 33 participants were selected for the analysis. The validation was divided into two phases. Phase 1 included 15 participants. If the device passed phase 1, 18 more participants were included. The 99 pairs of measurements were compared according to the International Protocol. The device was given a pass/fail recommendation based on its accuracy compared with the mercury standard (within 5, 10, and 15 mmHg), as well as the number met in the ranges specified by the International Protocol.Results: The mean and standard deviation of the difference between the mean of the observers and the BPU 330 device were 1.7 ± 4.7 mmHg and 2.8 ± 3.9 mmHg for systolic blood pressure (SBP) and diastolic blood pressure (DBP), respectively. In phase 1, the device passed with a total of 33, 43, and 44 SBP readings; 38, 44, and 45 DBP readings were within 5, 10, and 15 mmHg, respectively. In phase 2.1, 81, 95, and 96 for SBP, and 83, 95, and 98 for DBP readings fell within the zones of 5, 10, and 15 mmHg, respectively. In phase 2.2, the last phase, 28 participants fell within the zone of two of the three comparisons, lying within 5 mmHg for SBP and 29 participants for DBP. No participants fell within the zone of all three of their comparisons over 5 mmHg apart for both SBP and DBP.Conclusion: The BPU 330 can be recommended for self-monitoring of blood pressure in the adult population, according to the International Protocol.Keywords: blood pressure, self-monitoring, hypertension, International Protoco

Evaluation of Ecological Construction in Kunming using the DPSIR Model

Kunming is located in the south-western part of China and a lakeside city situated on plateau. Its ecological construction is typically representative. This paper takes the ecological construction data of Kunming City from 2007 to 2016 as a sample, and uses the Driving Force-Pressure-State-Influence-Response (DPSIR) model to quantitatively analyze the date, aiming at an objective evaluation of the future ecological construction of Kunming. The urban road greening proposes practical measures. The results of research show that in the past ten years, Kunming's ecological construction has shown a “fast-slow-stable” upward trend, indicating that it has achieved remarkable results. In the future, importance will continue to be attached to the development of tertiary industry, focusing on the introduction of innovative talents, and encouraging the active participation of the citizens. This is the “three-horse carriage”, which means three horses pull the cart together, for the sustainable development of ecological construction in Kunming