MILD oxy-fuel combustion has become the subject of study as it can improve the combustion efficiency and reducing the emission of harmful gases. However, there are few researches on the vortex motion of Oxy-fuel combustion, and there is no clear definition for the application of gas vortex. In this paper, based on the experimental and simulation data of the heating furnace, the distribution of eddy motion was analyzed from aspects of the turbulent vortex formation, formation, and movement of the vortex. In this paper, the vortex structure of the furnace is analyzed by using the Q criterion, λ2 method, and Ω method. We found that both Q criterion, λ2 criterion, and Ω method could identify the vortex structure in the furnace, but Ω method could identify the vortex structure that could not be identified by the other two methods. Ω could display more vortex structures and could identify both weak and strong vertices, with stronger recognition ability.
By applying reliability theory,the reliability evaluation method of cooperatively-manufactured- wheel-loader-parts(CMWLP)is researched in the paper.On the basis of characteristics of data from warranty period,the new method of evaluating CMWLP reliability is brought forward in this paper.The new method is applied to evaluate whether CMWLP reliability level meets the need of loader.Using the new method,reliabili- ty conditions of ZL50 CMWLP(engines)of two enterprises is evaluated and analyzed in the paper.The calcu- lated results show that this new evaluation method is correct in theory,simply in method,easy in using.
Professor LUO Cai-gui's experience of acupuncture at acupoint "Baliao" with twisting manipulation for treatment of low back pain is introduced. This method has significant efficacy on improving low back pain and numbness of lower extremities, which is characterized with short-time manipulation, quick de-qi and long effective time. The acupuncture methods, manipulations, precautions, etc. are elaborated in details. A typical case is added.
Abstract Metabolic Syndrome (MetS) and bone mineral density (BMD) have shown a controversial link in some studies. This research aims to study their association in males over 50 and postmenopausal females using National Health and Nutrition Examination Survey (NHANES) data. Postmenopausal females and males over 50 were included in the study. MetS was defined by the National Cholesterol Education Program Adult Treatment Panel III guidelines. BMD values were measured at the thoracic spine, lumbar spine, and pelvis as the primary outcome. Weighted multivariate general linear models have been employed to explore the status of BMD in patients with MetS. Additionally, interaction tests and subgroup analyses were conducted. Utilizing the NHANES database from 2003 to 2006 and 2011–2018, we included 1924 participants, with 1029 males and 895 females. In postmenopausal women, after adjusting for covariates, we found a positive correlation between MetS and pelvic (β: 0.030 [95%CI 0.003, 0.06]) and thoracic (β: 0.030 [95%CI 0.01, 0.06]) BMD, though not for lumbar spine BMD (β: 0.020 [95%CI − 0.01, 0.05]). In males over 50 years old, MetS was positively correlated with BMD in both Model 1 (without adjusting for covariates) and Model 2 (considering age and ethnicity). Specifically, Model 2 revealed a positive correlation between MetS and BMD at the pelvis (β: 0.046 [95%CI 0.02, 0.07]), thoracic spine (β: 0.047 [95%CI 0.02, 0.07]), and lumbar spine (β: 0.040 [95%CI 0.02, 0.06]). Subgroup analysis demonstrated that the relationship between MetS and BMD remained consistent in all strata, underscoring the stability of the findings. In postmenopausal women, after adjusting for all covariates, a significant positive correlation was observed between MetS and BMD in the pelvis and thoracic spine, whereas this correlation was not significant for lumbar spine BMD. Conversely, in males, positive correlations between MetS and BMD at the lumbar spine, thoracic spine, and pelvis were identified in Model 2, which adjusted for age and ethnicity; however, these correlations disappeared after fully adjusting for all covariates. These findings highlight the potential moderating role of gender in the impact of MetS on BMD.
The wireless medical sensor network is one of the emerging technologies that brought a revolution in medical image, healthcare monitoring, etc., playing a vital role in wireless healthcare online systems. However, security risks like privacy disclosure may arise since the medical sensors are connected via wireless. Secure anonymous communication is essential to protect patients' privacy. To this end, we give a seminal summary and comparison of the advanced anonymous communication technologies on wireless healthcare online systems. First, in order to solve the problem of patient privacy disclosure caused by health data disclosure, let us look at a privacy-sensitive public key infrastructure (PKI) model with advanced and advanced security that prevents disclosure of user registration keys. Next, to address the problem of spoofing users when accessing wireless sensors and to ensure that an adversary cannot modify sensor data through interception, look at key agreements and anonymous authentication protocols to address spoofing when users access wireless sensors (删掉). Furthermore, given the unreliability of wireless sensors and the hidden peril of health data transmitting in plaintext, a trust-based secure directed diffusion routing protocol is elaborated to establish a reliable routing and secure the transmission of health data. Finally, we expound on a lightweight anonymous communication model in wireless healthcare online systems, which realizes user identity authentication and the health data's confidentiality, so as to protect the privacy of patients.
Wetted ammonium bicarbonate can be decomposed at ambient temperatures, causing loss in production. Results of drying experiments show that as ammonium bicarbonate is quite sensitive to heat the traditional hot air drying method causes product loss and is not suitable for dissemination. A comparison between different drying methods such as oven drying, chemical drying and static water absorption is made. It is also pointed out that the treatment of ammonium bicarbonate with chemical drying method is suitable to spread in commercial production.
The voltage drop of various parts of 3 kA Rare earth electrolytic cell was calculated by consulting relevant literatures,and the structure voltage of the cell in production site was measured with digital voltmeter.The two results were consistent.The result of the voltage balance was discussed and analyzed.It provided the ways to increase the voltage efficiency and reduce the power consumption.It is helpful for the development of large electrolytic cell.
The combination of different types of mixer blade installation angle of the specific method of determining,for analyzing the mixer blade installation and use,and from the aspects of improving the service life of blade of mixer measures,analyzed and discussed for the maintenance of the application of blade of mixer,stirring mixer in order to improve the quality of equipment and the mixing efficiency,improve the service life of the mixer device.
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