Spatial and temporal variability of open biomass burning in Northeast China from 2003 to 2017

Open biomass burning(OBB)has a significant impact on the heavy haze pollution in Northeast China(NEC)in recent years,which requires the investigation of the spatiotemporal variations of OBB with different vegetation types to better monitor and control OBB in NEC.The MODIS C6 fire and land cover products,together with the emissions inventory from the Global Fire Assimilation System,were used in this study.The changes in the total number of MODIS fire points in NEC from 2003 to 2017 demonstrated a fluctuating but generally rising trend,with a peak during 2013–2017.Most fire points concentrated in two key periods,i.e.March–April(37%)and October–November(46%).The total number of crop residue burnings in March–April was basically slightly fluctuating and increased sharply from 2013,whilst the number in October–November had a fluctuating and upward trend until 2015,when a decline appeared.The amount of OBB in March–April was higher than that in October–November during 2016–17.OBB in Heilongjiang Province comprised a major proportion of all fires,which accounted for 70.7%from 2003 to 2017;however,the proportion was only 66.2%during 2013–2017.The largest proportion of all fires was in cropland(90.8%),then forest(5.3%)and grassland(3.1%).The cumulative emissions of fine particulate matter,nitrogen oxides,and ammonia from agricultural open burning in NEC reached 78.43 Gg,24.9 Gg,and 13.7 Gg for March–April during 2013–17,respectively,which were close to those in October–November.

Advances in Large-eddy Simulation of Two-phase Combustion (I) LES of Spray Combustion

Spray combustion is widely used in power, transportation, chemical and metallurgical, iron and steel making, aeronautical and astronautical engineering. In recent years, large-eddy simulation (LES) becomes more and more attractive, because it can give the instantaneous flow and flame structures, and may give more accurate statistical results than the Reynolds averaged Navier-Stokes (RANS) modeling. In this paper, the present status of the studies on LES of spray combustion is reviewed, and the future research needs are discussed.

万家火案

1 吃罢晚饭,起风了.凤英收拾完碗筷,抬头望天,就见乌黑的天上已堆积起了浊浪般的云团.凤英在围裙上抹了抹手,有些不悦地冲楼下的丈夫高声嚷嚷,天要下雨呢,紧着点把门口收拾收拾,关门打烊算了.丈夫听了,懒懒地欠起身,就往门口走去.

Introduction to LU Shou-yan's Acupuncture Theory

LU considers that correct manipulations are essential to the therapeutic effect. Reinforcing and reducing manipulations are especially important for zang-fu problems. He summarized the typical reinforcing-reducing manipulations： mountain-fire burning and heaven-penetrating cooling method as follows.

Effect of complex reinforcing-reducing manipulation on lower limb motion and balance disorder in patients with subacute combined degeneration of the spinal cord

Objective：To observe the effect of complex reinforcing [Shao Shan Huo （Mountain-burning Fire）] and reducing [Tou Tian Liang （Heaven-penetrating Cooling）] manipulations on motion and balance of the lower limbs in patients with subacute combined degeneration of the spinal cord （SCD）. Methods：A total of 100 SCD cases were randomly allocated into an observation group and a control group by their visit sequence, 50 cases in each group. On the basis of Western medical treatment, cases in the observation group were also treated with acupuncture therapy plus complex reinforcing-reducing manipulation; whereas cases in the control group were only treated with the same Western medical treatment as those in the observation group. Before and 2 months after treatment, kinematic parameters including muscle force, muscle tone and range of motion of the hip and knee joints were measured. In addition, balancing parameters including the path length of center of pressure （COP）, peripheral area, COP path length per unit area and rectangular area were also measured before and after treatment. Results：After treatment, there were statistical intra-group differences in COP path length, peripheral area, COP path length per unit area, left-right offset, rectangular area, coefficient of stability and coefficient of weight distribution （P〈0.01）. There were statistical inter-group differences in muscle force, muscle tone and range of motion of hip and knee joints （P〈0.01）. The total effective rate was 83.3% in the observation group, versus 60.0% in the control group, showing a statistical difference （P〈0.05）. Conclusion：Complex reinforcing-reducing manipulations can improve the lower limb motion and balance in SCD patients.

Effect of complex reinforcing-reducing manipulations on hip and knee flexion and extension angles after surgery of gluteus maximus contracture

Objective： To observe the effect of complex reinforcing-reducing manipulations of acupuncture on flexion and extension angles of hip and knee in patients after surgical treatment of gluteus maximus contracture. 〈br〉 Methods： A total of 66 cases following surgery of gluteus maximus contracture were randomly allocated into an observation group and a control group by the random digits table, 33 in each group. In addition to basic treatment, cases in the observation group were treated with reducing manipulation [Tou T ian Liang （Heaven-penetrating Cooling）] on Zhibian （BL 54）, Huantiao （GB 30） and Juliao （GB 29） on the affected side and reinforcing manipulation [Shao Shan Huo （Mountain-burning Fire）] on Biguan （ST 31）, Futu （ST 32）, Zusanli （ST 36）, Fenglong （ST 40）, Xuehai （SP 10）, Diji （SP 8） and Yanglingquan （GB 34）. Patients in the control group only received the same basic treatment as the observation group. The treatment was done once a day, 30 d for a course and a 1-week interval between two courses. Then the flexion and extension angles of hip and knee were evaluated using the Lokomat full automatic robot gait evaluation system after 3 courses of treatment. 〈br〉 Results：There were intra-group statistical differences in hip flexion angle on foot followed （HFA-FF）, the maximum of hip flexion angle （MAX-HFA）, the maximum of hip extension angle （MAX-HEA）, knee flexion angle on foot followed （KFA-FF）, the maximum of knee flexion angle on stance phase （MAX-KFA-TP） and the maximum of knee flexion angle on swing phase （MAX-KFA-WP） in the observation group and in HFA-FF, MAX-HEA and KFA-FF in the control group （P＆lt;0.05）. There were between-group statistical differences in HFA-FF, MAX-HFA, MAX-HEA, KFA-FF and MAX-KFA-TP （P＆lt;0.05）. 〈br〉 Conclusion： The complex reinforcing-reducing manipulations of acupuncture can effectively improve the hip/knee functions following surgery of gluteus maximus contracture.