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Since the dissolution of the former Soviet Union, the US, and China are aspiring to enhance their strategic influence in Central Asia which has recently been intensified due to China's Belt and Road Initiative (BRI). Further, China has also increased its influence in Central Asia through regional organizations such as Shanghai Cooperation Organization (SCO). Against this backdrop, Pakistan emerged as an important pivot of China's BRI where the China–Pakistan Economic Corridor (CPEC) is the flagship project. This study begins with a theoretical debate of Heartland theory of Halford John Mackinder and the later version of Heartland theory into Rimland theory by Nicolas Spykman, which explains the geopolitical significance of Central Asia for Major Powers. Within this theoretical context, the study discusses China and the US grand strategies in Central Asia in the form of China's BRI, SCO and the US counter‐strategies such as from phase 1.0, policy to 2.0, policy, and the recent initiative of C5 + 1. The study finds out that US–China strategic competition will have implications for various states having relations with both of these two major powers. In case of Pakistan, the strategic competition between China and the US will affect various dimensions of Pakistan's security at the broader level such as political, military, and economic security. First, at the political level, it is affecting Pakistan's relations with Russia, China, Iran, and Gulf States. Second, at military level, Pakistan's strategic value has been enhanced as a frontline state against terrorism. Finally, at the economic level, CPEC provides opportunities for Pakistan's economy and regional connectivity. [ABSTRACT FROM AUTHOR]

Strategic interdependence between China and Pakistan increased in the post‐9/11 period due to various regional and international developments. The strategic partnership between the two states which was evolved in 1960s due to Indian factor has now been transformed especially in the post‐Cold period where new factors have been added in their relationship. Some of the factors identified in this study include enhancement of the strategic value of these states for each other especially closer collaboration in the defense and security, Cooperation in regional connectivity, cooperation in the regional organizations, mutual consensus on core political issues of Kashmir and Taiwan and China's support to Pakistan stance on the India's membership of Nuclear Supplier Group (NSG). China‐Pakistan strategic cooperation has raised concerns in India which on its part is devising counter‐strategies. Although, the study is qualitative and based on content analysis, but at the same time it is empirical as it also explains the correlations between independent and dependent variable i.e China‐Pakistan strategic cooperation versus India's counter‐strategies. In this backdrop, the main argument of the study is that the strategic partnership between China and Pakistan is not just India centric but in the post‐Cold War period several other factors have been added and one of the prominent factor is the construction of CPEC. The study moreover finds out that these new developments in China‐Pakistan strategic partnership have implications for India due to India's unresolved border issues with both Pakistan and China. The study is significant in terms of its relevance to policy makers, politicians, academia, and think tanks. [ABSTRACT FROM AUTHOR]

This study examined the development of a digital pulse analyzer (DPA) used for obtaining the pulse height distribution (PHD), pulse width distribution (PWD), and interval time distribution (ITD) simultaneously by processing output signals from an optical particle counter (OPC). The characterization was performed by testing the response of the DPA as a function of its input frequency and pulse height using dummy signals from a signal generator (model DG1022, Rigol Technologies Inc., People's Republic of China) and actual OPC signals (Model KC-03, Rion Co. Ltd, Japan). Polystyrene latex particles of various sizes yielded by a scanning mobility particle sizer were used during the calibration of the DPA. It was found that the geometric mean of the PHDs was in accordance with Mie theory and could be used for converting pulse height into data which represents the size of particles. Furthermore, by using the PWD and ITD, we could estimate the viewing volume and dead time of the OPC. The DPA could successfully discriminate particles from baseline noise or voltage spikes by applying a novel algorithm to detect pulses based on the pulse area (integral of the voltage–time curve). The results showed that the ranges of particle diameter, viewing volume, and dead time measured by the OPC-DPA system were 0.2–1 µm, (0.78 ± 0.09) mm3, and (45.9 ± 12.6) µs, respectively. The new algorithm can be applied to pulse height analyzers in general, in the measurement of aerosol particles or scintillator-based particle detectors. [ABSTRACT FROM AUTHOR]

Climate change has become a global concern for scientists as it is affecting almost every ecosystem. Larix gmelinii and Betula platyphylla are native and dominant forest species in the Daxing'anling Mountains of Inner Mongolia, playing a major role in carbon sequestration of this region. This study was carried out to assess the effect of climate variables including precipitation and temperature on the biomass of Larix gmelinii and Betula platyphylla forests. For this purpose, we used the climate-sensitive stem biomass allometric model for both species separately to find out accurate stem biomass along with climatic factors from 1950 to 2016. A total of 66 random plots were taken to attain the data from this study area. Larix gmelinii and Betula platyphylla stem biomass have a strong correlation with annual precipitation (R2 = 0.86, R2 = 0.71, R2 = 0.79, and R2 = 0.59) and maximum temperature (R2 = 0.76, R2 = 0.64, R2 = 0.67, and R2 = 0.52). However, annual minimum temperature (R2 = 0.58, R2 = 0.43, R2 = 0.55, and R2 = 0.46) and annual mean temperature (R2 = 0.40, R2 = 0.22, R2 = 0.36, and R2 = 0.19) have a relatively negative impact on tree biomass. Therefore, we suggest that both species have a very strong adaptive nature with climatic variation and hence can survive under drought and high-temperature stress climatic conditions. [ABSTRACT FROM AUTHOR]

To understand Pakistan-China relations, it is necessary to discuss the evolution and development of their long term bilateral relations including factors and the environment that led to the consolidation of their strategic interdependence. The two countries initiated their bilateral relations by forging diplomatic ties and become close partners. They further engaged and consolidated their strategic interdependence and termed it as 'Iron Brothers.' This paper analyses basis of comprehensive cooperation under the different phases of Pakistan-China relations and the imperatives of interdependence between the two countries. It focuses on China's importance and engagement in the emerging dynamics of South Asia, especially India's efforts for regional superiority and its partnerships with major powers, particularly with the US. The outcome of discussion reflects that in the post 9/11 period, the imperatives of regional security, especially the growing Indo-US copertaion, added new dimensions to the Pakistan-China relationship. [ABSTRACT FROM AUTHOR]

Due to its tremendous volume and severe environmental concern, sewage sludge (SS) management and treatment are significant in China. The recent prohibition (June 2021) of reusing SS as organic fertilizers makes it urgent to develop alternative processes. However, there is currently little research analyzing the applicability of using HP for sewage SS treatment in China. The significant difference in SS composition and the much less land supply in urban areas might invalidate most previous localized suggestions. In this paper, the development of emerging hydrothermal processes (HPs) for SS treatment will be reviewed, focusing on their decomposition mechanisms and the benefits of HPs compared with current SS treatment technologies. The SS volume, composition, and regulatory regime in China will also be evaluated. Those efforts could address the potential SS treatment capacity shortage and provide an opportunity to recover nutrients, organics and energy embedded in SS. The results show that HPs' high investment cost is mainly limited by the process scale, while their operating costs are comparable to incineration. Minimizing equipment erosion, ensuring process safety, and designing a more efficient heat recovery system are recommended for the future commercialization of HPs in China., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier B.V. All rights reserved.)

Newcastle disease (ND), caused by ND virus (NDV), is one of the most infectious and economically important diseases of the poultry industry worldwide. While infections are reported in a wide range of avian species, the pathogenicity of chicken-origin virulent NDV isolates in ducks remains elusive. In this study, two NDV strains were isolated and biologically and genetically characterized from an outbreak in chickens and apparently healthy ducks. Pathogenicity assessment indices, including the mean death time (MDT), intracerebral pathogenicity index (ICPI) and cleavage motifs in the fusion (F) protein, indicated that both isolates were velogenic in nature. While these isolates carried pathogenic characteristics, interestingly they showed differential pathogenicity in ducks. The chicken-origin isolate caused high (70%) mortality, whereas the duck-origin virus resulted in low (20%) mortality in 4-week-old ducks. Intriguingly, both isolates showed comparable disease pathologies in chickens. Full-genome sequence analysis showed that the virus genome contains 15 192 nucleotides and carried features that are characteristic of velogenic strains of NDV. A phylogenetic analysis revealed that both isolates clustered in class II and genotype VII. However, there were several mutations in the functionally important regions of the fusion (F) and haemagglutinin-neuraminidase (HN) proteins, which may be responsible for the differential pathogenicity of these viruses in ducks. In summary, these results suggest that NDV strains with the same genotype show differential pathogenicity in chickens and ducks. Furthermore, chicken-origin virulent NDVs are more pathogenic for ducks than duck-origin viruses. These findings propose a role for chickens in the evolution of viral pathogenicity and the potential genetic resistance of ducks to poultry viruses., (© 2018 Blackwell Verlag GmbH.)