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Effect of potassium promoter on phase transformation during the isothermal and temperature programmed reduction of the α-Fe2O3 catalyst were systematically investigated by in situ XRD. The reduction pathway of Fe2O3 based catalysts follows the same sequence of α-Fe2O3 → Fe3O4 → α-Fe during the isothermal reduction, in contrast to that of α-Fe2O3 → Fe3O4 → FeO/ α-Fe→ α-Fe during the temperature programmed reduction. The potassium promoter notably inhibits the reduction from α-Fe2O3 to Fe3O4 due to the enhanced strength of Fe-O bonds, whereas it either accelerates or has no effect on the formation rate of α-Fe crystallites during reduction. The potassium promoter increases the CO conversion during FTS, while enhances C5+, olefins, CO2 selectivity, and decreases CH4 selectivity.

Objectives To assess the impact of cardiovascular disease (CVD) risk factor control on health-related quality of life (HRQoL), as well as the other influencing factors of HRQoL among high CVD risk individuals. Methods From 2015 to 2017, residents of six villages or communities in Inner Mongolia, selected using a multi-stage stratified cluster random sampling method, were invited to complete a questionnaire and undergo physical examination and laboratory testing. We selected participants whose predicted 10-year risk for CVD exceeded 10% as those with high CVD risk. HRQoL in individuals with high CVD risk was investigated based on the EuroQol-5 Dimension (EQ-5D) scale. The Chinese utility value integral system was used to calculate EQ-5D utility scores, and the Tobit regression model was used to analyze the influencing factors of HRQoL among individuals with high CVD risk. Results Of 13,359 participants with high CVD risk, 65.63% reported no problems in any of the five dimensions; the most frequently reported difficulty was pain/discomfort. The median utility score was 1.000 (0.869, 1.000). Participants with hypertension, and uncontrolled glycemic and blood lipids had lower HRQoL. In addition, sex, age, living environment, education level, household income, and medical insurance were influencing factors of HRQoL. Conclusion Sex, age, living environment, education level, household income, medical insurance, hypertension, and whether glycemic and blood lipids control or not are related to HRQoL of high CVD risk individuals.

Evidence on the effects of ozone on chronic lower respiratory disease (CLRD), acute respiratory infections (ARI) is still not conclusive. This study aimed to investigate the association between them in Hohhot China. Daily death counts, concentrations of PM2.5, PM10, SO2, NO2, and O3, and meteorological data were collected for Hohhot city from January 1, 2018, to December 31, 2019. We performed a time series analysis using generalized additive model (GAM). In single pollutant model, the estimated excess relative risks (EERs) for respiratory and CLRD mortality were 2.815% (95% CI: 0.075–5.630) at lag 04 and 4.409% (95% CI: 1.577–7.320) at lag 01, respectively, for each 10 µg/m3 increase in O3. No significant association was found for ARI and the other respiratory diseases mortality. Subgroup analysis showed that the respiratory diseases for men were more susceptible to O3 than women, while men had a lower association with CLRD than women. Concentrations of O3 were significantly associated with respiratory disease and CLRD for older adults. The significant positive association between O3 and respiratory mortality and CLRD mortality remained largely unchanged in the two-pollutant model and the multi-pollutant model. In conclusion, short-term exposure to O3 is significantly associated respiratory diseases and CLRD mortality, and this association is dominated by gender and age.

Instrumental detection and physical simulation methods were used to study the viscosity, molecular aggregate dimension (Dh), micro-morphology, seepage characteristics, permeability limit, matching ...

Based on practical needs of oil fields, the viscosity, interfacial tension, static absorption, phase behaviors, molecular clew dimension (Dh), molecular configuration and flooding effect of the alkali/surfactant/polymer (ASP) systems were studied by instrumental analysis and physical modeling. The mechanisms of enhanced oil recovery were also discussed. As alkali concentration increased, the viscosity, interfacial tension and Dh of ASP decreased. As surfactant concentration increased, the viscosity and Dh increased, while the interfacial tension first decreased and then rose. The viscosity, interfacial tension and Dh of weak-alkali ASP all surpassed those of the strong-alkali ASP. The saturated absorption quantity of ASP ranked as surfactant > alkali > polymer. The saturated adsorption quantity and the ability to reduce the surfactant adsorption loss of the strong alkali were both higher, but the ability to reduce polymer adsorption loss was lower, compared with the weak alkali. As the concentrations of alkali and surfactant rose, the stability of emulsions was enhanced. The effect of alkali on the polymer molecular aggregation surpassed that of the surfactant. Physical modeling showed as the viscosity of the flooding agent rose, the recovery rate of weak-alkali ASP increased by 22.0% under the conditions of 1.2 wt% alkali, 0.3 wt% surfactant and 2500 mg/L polymer. The contribution rate to the recovery efficiency of A compound flooding ranked as the extended swept volume effect of the polymer (αp) > displacement effect (β) > the extended swept volume of emulsification (αe). The results were αp = 73.5%, β = 19.9%, αe = 6.6% (weak-alkali ASP); αp = 68.5%, β = 23.0%, αe = 8.4% (strong-alkali ASP).

Iron carbide phase formation during carburization of α-Fe catalysts were studied using in situ XRD, where the effect of varying carbon chemical potentials of CO/syngas/C 2 H 4 /C 2 H 2 gases and potassium promoter on the carburization behaviors was studied. The actual carburization capability of these gases follows an order of 2% CO/He 2 H 4 /He 2 /He 2 H 2 /He, which does not correlate well with the theoretical carbon chemical potential. In addition, the carburization rate and the formation of carbon-rich iron carbides are favored by potassium under CO or syngas, while inhibited by potassium under C 2 H 4 or C 2 H 2 . Temperature programmed carburization together with pulse experiments and DFT calculations indicate that the potassium promoter could weaken the adsorption ability of the C 2 H 4 and C 2 H 2 and thus reduce their carburization capabilities.

Aim: The aim of the research is to determine characteristic of the correlation between climate and stroke through the analysis of relevant documents. Methods: We found 115 researches of temperature and season on stroke mortality/incidence and these were categorized according to location, meteorology, date span, data source and research sites’ latitudes. We divided the globe into 5 temperature zones based on latitude ranges: 0 - 10, 10 - 23.5, 23.5 - 40, 40 - 50, and >50 degrees, and allotted a zone to each country. Stroke mortality by five temperature zones was calculated per 100,000 people. Results: 70% of the researches came from latitudes greater than 40 degrees with 92% of researches located in Europe, USA, and Asia. The mortality range was 42 - 63 per 105 individuals within latitudes 0 - 40 degrees. In latitudes 40 - 66.5 degrees, a linear upward trend (y = 69.82x − 22.823, R2 = 0.99) was noticed. More than 75% of the research reports indicated a negative correlation between climate and stroke, and the proportion was almost 6 and 7 times greater than that of the fluctuation and non-correlation, respectively. The most frequently used research methods were regression analysis and time series analysis. Conclusion: All of the research results confirmed that lower temperature is associated with higher mortality and incidence of stroke, while higher latitude is correlated with higher stroke mortality, consistent with the temperature zones.

Background The high risk of cardiovascular disease (CVD) being associated with impaired Health-related quality of life (HRQoL). However, few studies have assessed the HRQoL of individuals with a high risk of CVD in Inner Mongolia, or even in China. We aimed to assess health-related quality of life (HRQoL) among individuals in Inner Mongolia with a high risk of CVD and its risk factors, to provide a reference to improve HRQoL in individuals with high CVD risk. Methods From 2015 to 2017, residents of six villages or communities in Inner Mongolia, selected using a multi-stage stratified cluster random sampling method, were invited to complete a questionnaire and undergo physical examination and laboratory testing. We selected participants whose predicted 10-year risk for CVD exceeded 10% as those with high CVD risk. HRQoL in individuals with high CVD risk was investigated based on the EuroQol-5 Dimension (EQ-5D) scale. The Chinese utility value integral system was used to calculate EQ-5D utility scores, and the Tobit regression model were used to analyze the influencing factors of HRQoL among individuals with high CVD risk. Results Of 13,359 participants with high CVD risk, 65.63% reported no problems in any of the five dimensions; the most frequently reported difficulty was pain/discomfort. The mean utility score was 1.000 (0.869, 1.000). Tobit regression analysis showed that sex, age, education level, residence area, household income, physical activity, hypertension, and dyslipidemia were influencing factors of HRQoL. Conclusion We found that female sex, older age, living in an urban area, lower education level, lower household income, and lower physical activity levels were associated with reduced HRQoL. People with a high risk of CVD should maintain their blood glucose and lipid levels within the normal range.

Background: Hypertension has always been a worldwide health concern. The purpose of this study was to investigate the prevalence, awareness, treatment, and control rates of hypertension among adult residents of northern China, where people usually have a high-fat, high-salt diet and heavy alcohol consumption.Methods: Through the Early Screening and Comprehensive Intervention Project for High Risk Groups of Cardiovascular Diseases in the Inner Mongolia Autonomous Region of northern China, we collected data of 70,380 residents, from September 2015 to June 2017. We assessed the prevalence, awareness, treatment, and control of hypertension in the total population and subpopulations.Results: Among participants, only 13.4% had optimal blood pressure levels. About 55.7% (95% confidence interval (CI): 55.3%–56.1%) of the participants had hypertension. The national standardized and the regional standardized prevalence rate was 49.4% and 55.4%, respectively. Multivariate logistic regression showed that old age, male, Han, living in rural, farmer, current drinker, not married, diabetes, obesity and dyslipidemia were associated with hypertension. In addition, the awareness, treatment, control and control under treatment rate of hypertension were 52.8% (95% CI: 52.3%–53.3%), 43.3% (95% CI: 42.8%–43.8%), 8.6% (95% CI: 8.3%–8.9%) and 19.8% (95% CI: 19.2%–20.4%), respectively. And the 70,380 population subgroups varied with respect to hypertension prevalence (range 32.6%-73.4%), awareness (35.1%-76.2%), treatment (24.9%-64.6%), control (3.9%-20.4%), and control under treatment (11.2%-31.6%). Controlled hypertension were less common in those younger age, Mongol, not married, farmer and current drinker. Conclusion: Most patients of hypertension are going undetected and uncontrolled in northern China. Even if patients with hypertension are under treatment, hypertension can remain inadequately controlled.

Cardiovascular disease (CVD) is a life-threatening chronic illness. CVD risk may be influenced by environment and lifestyle. People in northern China usually consume high-fat, high-salt diets and alcohol and live in a cold climate over long periods. However, there are limited studies on CVD risk among people in northern China. In the present study, we sought to estimate the CVD risk profile among residents of northern China. Using the Programme of Screening and Intervention Subjects with High Risk Cardiovascular Diseases, we collected data from residents in six cities from September 2015 to June 2017. In total, 56,716 participants aged 40 years and above were finally included in the CVD risk assessment. To assess the 10-year risk of CVD among participants, we used World Health Organisation/International Society of Hypertension risk prediction charts. Among the study participants, 22.7% had a high 10-year risk of CVD. We identified differences in the 10-year CVD risk according to sex, socioeconomic status, and marital status. We conclude that individuals with high socioeconomic status should be encouraged to change their lifestyle habits, and greater medical resources should be invested for individuals residing in rural areas and those with low education levels.

Aims Hypertension has always been a worldwide health concern. The purpose of this study was to investigate the prevalence, awareness, treatment, and control rates of hypertension among adult residents of northern China, where people usually have a high-fat, high-salt diet and heavy alcohol consumption. Methods Through the Early Screening and Comprehensive Intervention Project for High Risk Groups of Cardiovascular Diseases in the Inner Mongolia Autonomous Region of northern China, we collected data of 70,380 residents and assessed the prevalence, awareness, treatment, and control of hypertension in the total population and subpopulations. Results Among participants, only 13.9% (11.7% of men and 15.4% of women) had optimal BP levels. 55.7% (95% confidence interval (CI): 55.3–56.1%) of the participants had hypertension. A total 52.8% (52.3–53.3%) of patients with hypertension were aware of their diagnosis and 43.3% (42.8–43.8%) were taking antihypertensive medications. Only 8.6% (8.3–8.9%) of patients with hypertension had their BP under control, and 19.8% (19.2–20.4%) of those who were treated had their BP under control. The standardized rates of hypertension prevalence, awareness, treatment, control, and control under treatment were 49.4% (49.0–49.8%), 45.4% (44.9–45.9%), 35.7% (35.2%–36.2), 7.3% (7.0–7.6%), and 20.8% (20.2–21.4%), respectively. Conclusion Hypertension is highly prevalent in northern China, with inadequate awareness, treatment, and control of hypertension. Even if patients with hypertension are under treatment, hypertension can remain inadequately controlled.

Background Hypertension has always been a worldwide health concern. The purpose of this study was to investigate the prevalence, awareness, treatment, and control rates of hypertension among adult residents of northern China, where people usually have a high-fat, high-salt diet and heavy alcohol consumption. Methods Through the Early Screening and Comprehensive Intervention Project for High Risk Groups of Cardiovascular Diseases in the Inner Mongolia of northern China, we collected data of 70,380 residents, from September 2015 to June 2017. We assessed the prevalence, awareness, treatment, and control of hypertension in the total population and sub-populations. Multivariable logistic regression analyses were used to identify the factors associated with the prevalence and control of hypertension. Results Among participants, only 13.4% had optimal blood pressure levels. About 55.7% (95% confidence interval (CI) = 55.3–56.1%) of the participants had hypertension. In addition, the awareness, treatment, control and control under-treatment rate of hypertension were 52.8% (95%CI = 52.3–53.3%), 43.3% (95%CI = 42.8–43.8%), 8.6% (95%CI = 8.3–8.9%) and 19.8% (95%CI = 19.2–20.4%), respectively. Multivariable logistic regression showed that older, male, Han, living in rural areas, current drinker, not married, lower educational level, lower annual income, diabetes, obesity, and dyslipidemia were more likely to be suffered from hypertension (P P Conclusion Among populations aged 35–75 years in Northern China, more than half have hypertension, fewer than one-tenth have successfully controlled hypertension, and fewer than one-fifth of hypertension patients receiving treatment have controlled hypertension.

Background: Cardiovascular disease (CVD) prevalence has increased continuously over the last 30 years in China. Dyslipidemia is an important modifiable risk factor in CVD. We aimed to collect current data on the prevalence of dyslipidemia in northern China and explore potential influencing factors.Methods: In this cross-sectional study, we selected a representative sample of 65,128 participants aged ≥35 years in Inner Mongolia during 2015–2017. All participants completed a questionnaire and were examined for risk factors. Dyslipidemia was defined according to 2016 Chinese guidelines for adults. The associated factors for dyslipidemia were estimated by multivariate logistic regression analysis.Results: The age-standardized prevalence of dyslipidemia was 31.2% overall, with 4.3%, 2.4%, 14.7%, and 17.4% for high total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), triglycerides (TG), and low high-density lipoprotein cholesterol (HDL-C), respectively. The dyslipidemia prevalence was significantly higher in men than women (37.9% vs. 27.5%, PPConclusions: Our study revealed that dyslipidemia is a health problem in northern China. Greater efforts to prevent and manage dyslipidemia, especially in men under age 55 years, postmenopausal women, and people with unhealthy lifestyles or chronic diseases.

Polymer microsphere profile control is a promising approach for the profile control of heterogeneous reservoirs. Matching between polymer microspheres and the reservoir pore throat is crucial for profile control. In this study, the range of the optimal matching factor Ra between polymer microspheres and core porosity was divided through core permeability limit experiments, and the dynamic migration laws and shut-off patterns of microspheres were studied using 9-m-long cores and microscopic models. The oil displacement effect and mechanism of microspheres were analyzed using three cores in parallel. The &ldquo, injectability limit&rdquo, and &ldquo, in-depth migration limit&rdquo, curves were divided by Ra into three zones: blockage (Ra &lt, 1.09 &plusmn, 0.10), near-well profile control (1.09 &plusmn, 0.10 &lt, Ra &lt, 5.70 &plusmn, 0.64), and in-depth fluid diversion (Ra &gt, 0.64). During migration in porous media, the microspheres gradually enlarged in size and thus successively shut off in four forms: multi-microsphere bridging shut-off, few-microsphere bridging shut-off, single-microsphere shut-off, and elastic shut-off. Microspheres with a rational combination of sizes versus those with a single particle size further enhanced reservoir oil recovery under certain reservoir conditions. Through &ldquo, temporary shut-off&ndash, breakthrough&ndash, temporary shut-off,&rdquo, the polymer microspheres were able to change the fluid flow rate and streamlines, mobilize residual oils, and enhance the oil recovery rates.

Herein, an environmentally friendly electrochemical approach is reported that takes advantage of the captodative effect and delocalization effect to generate nitrogen-centered radicals (NCRs). By changing the reaction parameters of the electrode material and feedstock solubility, dearomatization enabled a selective dehydrogenative C-N versus N-N bond formation reaction. Hence, pyrido[1,2-a]benzimidazole and tetraarylhydrazine frameworks were prepared through a sustainable transition-metal- and exogenous oxidant-free strategy with broad generality. Bioactivity assays demonstrated that pyrido[1,2-a]benzimidazoles displayed antimicrobial activity and cytotoxicity against human cancer cells. Compound 21 exhibited good photochemical properties with a large Stokes shift (approximately 130 nm) and was successfully applied to subcellular imaging. A preliminary mechanism investigation and density functional theory (DFT) calculations revealed the possible reaction pathway.

Gold (Au) on ceria–zirconia is one of the most active catalysts for the low-temperature water–gas shift reaction (LTS), a key stage of upgrading H2 reformate streams for fuel cells. However, this catalyst rapidly deactivates on-stream and the deactivation mechanism remains unclear. Using stop–start scanning transmission electron microscopy to follow the exact same area of the sample at different stages of the LTS reaction, as well as complementary X-ray photoelectron spectroscopy, we observed the activation and deactivation of the catalyst at various stages. During the heating of the catalyst to reaction temperature, we observed the formation of small Au nanoparticles (NPs; 1–2 nm) from subnanometer Au species. These NPs were then seen to agglomerate further over 48 h on-stream, and most rapidly in the first 5 h when the highest rate of deactivation was observed. These findings suggest that the primary deactivation process consists of the loss of active sites through the agglomeration and possible dewetting of Au NPs.

A study of the promotional effect of potassium on the carburization behavior of a series of spray-dried precipitated Fe2O3 catalysts (100 Fe, 100 Fe/0.52 K, 100 Fe/1.54 K, and 100 Fe/2.4 K) has been performed by using in situ XRD. The average crystallite size evolution for species such as α-Fe2O3, Fe3O4, χ-Fe5C2, and θ-Fe3C were followed. The potassium promoter clearly inhibits the reduction of α-Fe2O3 to Fe3O4, where the decreasing binding energy in the Fe 2p3/2, O 1s and K 2p3/2 spectra from X-ray photoelectron spectroscopy (XPS) suggests an electron density increase in Fe and O upon potassium promotion, leading to the enhanced covalency in the Fe−O bond. In terms of crystallite size during carburization, an optimum potassium loading exists in catalyst 100 Fe/0.52 K, which shows the fastest reduction to Fe3O4 with minimum crystallite sizes of around 7 to 15 nm. Potassium has no clear effect in determining the final crystallite size of χ-Fe5C2. An arch-shaped curve in the evolution of crystallite size of the Fe3O4 intermediate was observed, which can be explained by the activation energy difference between the bidirectional steps of the outward oxygen diffusion and the inward carbon diffusion.

Reducing the risk of diabetes has been a great public health challenge in China. In this study, we aimed to estimate the treatment and control of FPG (fasting blood plasma glucose) as well as the other main modifiable cardiovascular disease (CVD) risk factors in patients with diabetes and to identify those characteristics associated with the treatment and control of diabetes, hypertension, and low-density lipoprotein cholesterol (LDL-C). Between 2015 and 2017, participants aged 35 to 75 years from Inner Mongolia in northern China were recruited. A total 13,644 participants with diabetes were enrolled in this study. We calculated rates and 95% confidence intervals for treatment and control of FPG, blood pressure, and LDL-C. We performed multivariate logistic regression to identify characteristics associated with the treatment and control of diabetes as well as hypertension and LDL-C. Overall, the treatment rates of diabetes, hypertension, and dyslipidemia were 30.76%, 50.75%, and 9.17%, respectively. Control rates of FPG, blood pressure, and LDL-C were 4.73%, 4.86%, and 57.83%, respectively. Patients who were younger, Mongol ethnicity and rural residents were less likely to be treated and controlled for diabetes and hypertension. Patients insured by NCMS (new rural cooperative medical scheme) were less likely to be treated and achieve the treatment target of blood pressure. Patients having prior CVD were more likely to be treated and have controlled FPG and blood pressure. Substantial efforts are urgently needed to improve the treatment and control of these modifiable CVD risk factors among patients with diabetes in Inner Mongolia.

Rapid urbanization has generated enormous pressure on natural resources. This study illustrates urban expansion in the Jing-Jin-Ji region and its influence on vegetation primary productivity. Tempo-spatial correlations between a vegetation index and nighttime light intensity are discussed to assess the urbanization effect quantitatively. The results show that: (1) From 1998 to 2018, urban areas gradually expanded outward from their original conglomerations. (2) In the past 20 years, Beijing and Tianjin have developed in different ways. The surrounding satellite cities have mostly developed concentrically, although some cities in Hebei province have developed more linearly. (3) The average primary productivity of the study area in 1998, 2003, 2008, 2013, and 2018 was generally lower than that of non-urban regions of the same year. (4) During the period from 1998 to 2018, the primary productivity of vegetation in the urban built-up areas increased, and the condition of the plant improved.

Iron oxide nanoparticles (NPs) were prepared by the thermal decomposition of iron-oleate. The effects of reaction temperature, time, solvent, and surfactant were tested. The synthesized NPs were characterized by X-ray diffraction, Transmission electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis,, and Fourier transform infrared. The results show that reaction time has little effect on the sizes of synthesized NPs, while the solvent directly decides the sizes. There is a most appropriate temperature to fulfill perfect monodisperse iron oxide NPs. Moreover, different surfactants lead to different shapes of synthesized NPs.

Recently, genetic algorithm for generating low order models for large-scale interval systems using simplified polynomial improved algorithm is proposed. New algorithm are developed for obtaining the numerator and denominator polynomials of the reduced order model which also retain the steady state response characteristics of the original high order interval system in its low order model, unlike existing methods. The method is computationally simple avoiding the necessity of formation of long Routh-type differentiation arrays and reciprocal transformations and always retains stability of the original system in the low-order models. Typical numerical illustrating examples are provided by using the proposed method.