primary support
Recently Published Documents


TOTAL DOCUMENTS

137
(FIVE YEARS 43)

H-INDEX

13
(FIVE YEARS 4)

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Tuan Minh TRAN ◽  
Ngoc Thai DO ◽  
Trung Thanh DANG ◽  
Duyen Phong NGUYEN ◽  
Trong Hung VO

Large rock mass deformation around deep roadways in the weak rocks was a significantproblem in mining activities in Vietnam and other countries. The excavation of roadways leads to highreleasing stress, which exceeds the peak strength of spalling surrounding rock and causes it to enter thepost-failure stage. Tensile failures then initiate and develop around the roadways, which causes thefragmentation, dilation, and separation of surrounding rock. The capacity of the primary support systemis low, which results in a severe contraction in the whole section of roadways, which requires findingsolutions to prevent the deformation of rock mass around roadways and technical solutions fromstabilizing for deep roadways. To stability analysis of roadways can be applied analytical, experimental,semi-experimental, and numerical methods. This paper introduces the prevention mechanism of largedeformation of rock mass around roadways using 2-level rock bolts. The research results show that usingthe system of two-level rock bolts can reduce the values of tensile stress on the boundary of roadwaysrange from 10 to 15% compared with only one. The importance of the total displacement of rock mass onthe boundary of roadways will be reduced from 3.47 to 13.85% using six long cable bolts.


2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Leanne Jackson ◽  
Leonardo De Pascalis ◽  
Joanne A. Harrold ◽  
Victoria Fallon ◽  
Sergio A. Silverio

Abstract Background COVID-19 has placed additional stressors on mothers during an already vulnerable lifecourse transition. Initial social distancing restrictions (Timepoint 1; T1) and initial changes to those social distancing restrictions (Timepoint 2; T2) have disrupted postpartum access to practical and emotional support. This qualitative study explores the postpartum psychological experiences of UK women during different phases of the COVID-19 pandemic and associated ‘lockdowns’. Methods Semi-structured interviews were conducted with 12 women, approximately 30 days after initial social distancing guidelines were imposed in the UK (22 April 2020). A separate 12 women were interviewed approximately 30 days after the initial easing of social distancing restrictions (10 June 2020). Data were transcribed verbatim, uploaded into NVivo for management and analysis, which followed a recurrent cross-sectional approach to thematic analysis. Results Two main themes were identified for T1: ‘Motherhood is Much Like Lockdown’ and ‘A Self-Contained Family Unit’. Each main T1 theme contained two sub-themes. Two main themes were also identified for T2: ‘Incongruously Held Views of COVID-19’ and ‘Mothering Amidst the Pandemic’. Each main T2 theme contained three sub-themes. Comparisons between data gathered at each timepoint identified increased emotional distress over time. Current findings call for the improvement of postpartum care by improving accessibility to social support, and prioritising the re-opening of schools, and face-to-face healthcare appointments and visitation. Conclusion Social distancing restrictions associated with COVID-19 have had a cumulative, negative effect on postpartum mental health. Recommendations such as: Allowing mothers to ‘bubble’ with a primary support provider even at their healthcare appointments; allowing one support partner to attend all necessary healthcare appointments; and providing tailored informational resources, may help to support postpartum emotional wellbeing during this, and similar health crises in the future.


2021 ◽  
Vol 5 (4) ◽  
pp. 1-20
Author(s):  
D.Michelle Naomie Mavoungou ◽  
Pingsong Zhang ◽  
Siwei Zhang ◽  
Qiong Wang

The effect of grouting behind tunnel wall directly affects the surrounding ground settlement and the stability of tunnel structure, so the grouting quality detection is very necessary. As an efficient and convenient shallow geophysical exploration method, ground-penetrating radar can meet the high-resolution and non-destructive requirements of grouting quality detection behind the tunnel wall, so it is widely used in engineering in recent years. Most of the existing studies have obvious regional pertinence and special geological conditions, and there are few universal studies on the characteristics of the ground penetrating radar reflection image of the grouting defect behind the tunnel wall. In view of this, this paper uses the finite difference time domain method to simulate several grouting defects behind the wall, such as voids, water-bearing anomaly, cracks, and other grouting defects. The simulation results show that the reflection image of the direct wave is characterized by a white band with strong amplitude; the interface between primary support and second lining, primary support, and surrounding rock is also banded; the circular cavity and water anomaly characteristics are all hyperbolic, the difference is that the phase of the lower part of the radar image of the cavity anomaly is 0, and there are only hyperbolic tails on both sides, and the water-bearing anomaly also has obvious hyperbolic characteristics at each interface; the reflected wave characteristics of the rectangular crack are striped and watery and the reflected wave characteristic of rectangular cracks is striped, and the abnormal range of water-bearing cracks on the radar image is larger than that of air. The research results can provide an effective theoretical reference for the engineering application of ground penetrating radar detection of grouting defects behind the tunnel wall.


2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zhongming Su ◽  
Jianxun Chen ◽  
Yanbin Luo

In this paper, field measurement is used to obtain the force of system anchor in its actual working condition and stress situation of system anchors in different parts of loess tunnel is analyzed based on field test results, indicating the reasons why values of measured axial force of system anchor are different in different parts of loess tunnel. Based on the displacement solution of Mindlin problem, this paper deduces the analytical solution to stress distribution of system anchors in the sidewall of loess tunnel under the pull-out force, analyzes the distribution forms and influencing factors of shear stress and axial force. At the same time, analytical solutions to system anchor stress and surrounding rock plastic zone radius are tentatively applied to the analysis of stress characteristics and length optimization of system anchor in loess tunnel. The research results are of great significance to understand the mechanical characteristics of anchors in loess tunnel and to optimize the design of anchors in the primary support system of loess tunnel, which leads to accelerated construction progress and low economically cost, especially in loess tunnels with large cross section and long span.


2021 ◽  
Vol 5 (2) ◽  
pp. 01-03
Author(s):  
Hayriye Alp

Phytotherapy, medicinal and aromatic plants, algae, fungi and lichens, or their extracts, such as gum, balsam and resin, extracts, essential oils, candles and fixed oils with herbal preparations prepared in various forms (tea, capsule, tablet, syrup, drop , lozenges, sachets, etc.) to be protected from diseases, to treat diseases or to support treatment. Phytotherapy; It is based on scientific research and clinical studies. Historically, it has been the primary support of doctors in the treatment of diseases. Objective:We offer here; In addition to the treatment of obesity with acupuncture and phytotherapeutically artichoke (Cynara scolymus L.) and thistle (Silybum marianum (L.) Gaertn.), dandelion (Taraxacum officinale FH Wigg.) using antidepressants for many years, the treatment of obesity with impaired obesity and elevated liver enzymes. It is a case where a positive decrease is achieved in liver enzymes by giving mix extract. Methods: Yin-tan, Memory, Kid-3, Liv-3, St-36,24,25 in body acupuncture, Shen-men, stomach, larynx, jerome, kidney points were pinned in ear acupuncture. When patients who apply to the outpatient clinic need phytotherapeutic support, liver enzymes are routinely checked. Results:The patient lost both weight and liver enzymes. Conclusions and Recommendations: The biggest disadvantage of these preparations is their uncontrolled and high-dose use. It is most appropriate to give this kind of support treatments by people who are trained and licensed in this regard, especially under the control of a doctor. For this purpose, the Department of Traditional Complementary Medicine provides the development of physicians and pharmacists who have received phytotherapy training.


2021 ◽  
Vol 111 ◽  
pp. 103845
Author(s):  
Keguo Sun ◽  
Yiqin Hong ◽  
Weiping Xu ◽  
Zonghao Hou ◽  
Xu Liu ◽  
...  

2021 ◽  
Author(s):  
Cui Guang-yao ◽  
Song Bohan

Abstract In this paper, based on the F8 stick-slip fault section of Longxi Tunnel in China, the effect of the anti-breaking measure of rigid-flexible composite (reinforcement of the secondary lining & construction of the reducing dislocation layer between the primary support and the secondary lining) is studied by using the method of indoor model test in order to improve the anti-breaking performance of the tunnel across stick-slip fault in the actual tunnel engineering. The test results show that the anti-breaking effect is limited by adopting structural strengthening measures to resist the influence of stick-slip dislocation on the tunnel structure and the anti-breaking effect is obvious by adopting the measures of reducing dislocation layer only. However, the structural safety of the tunnel with stick-slip fault in the strong seismic intensity area can be greatly improved by adopting the anti-breaking measure of rigid-flexible composite, and the structural safety factor can be significantly improved. The research results of this paper can provide a reference for the anti-breaking design of the tunnel across stick-slip fault in the high seismic intensity area.


Healthcare ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 403
Author(s):  
Kyoko Yoshioka-Maeda ◽  
Hitoshi Fujii

To prevent emergency admissions and save medical costs, support should be provided to households that include people with complex care needs to allow them to continue living in their own homes. This community-based, cross-sectional study was conducted to (1) identify which departments that public health nurses (PHNs) worked have been the primary providers of support for households with complex care needs and (2) clarify the length of time required by each department to resolve primary health problems. We analyzed 148 households with complex care needs that were registered in City A from April 2018 to July 2019. Four types of departments were the primary support providers for complex care households: the department supporting persons with disabilities (n = 54, 36.5%), public/community health centers (n = 47, 31.8%), department of older adults (n = 29, 19.6%), and welfare offices (n = 18, 12.2%). The Mantel–Cox test showed that welfare offices mainly supported households in economic distress and needed significantly less time to resolve their primary health issues than other departments. For early detection and resolution of primary health problems for households with complex care needs, PHNs and healthcare professionals should focus on their economic distress and enhanced multidisciplinary approaches.


Sign in / Sign up

Export Citation Format

Share Document