The phrase "and many techniques have" is correct and usable in written English.
You can use it when discussing various methods or approaches that exist or have been developed in a particular field or context.
Example: "In the study of language acquisition, many techniques have been proposed to enhance learning outcomes."
Alternatives: "and numerous methods have" or "and several approaches have".
End to end latency is one of the most significant factors of packets loss in wireless sensor nodes, and many techniques have been proposed based on listening adaptively to reduce delay, which are mainly designed for light traffic loads.
Though stereo matching has been extensively studied and many techniques have been proposed, accurate and efficient stereo matching is still challenging and this issue is worthy of being further studied.
During the last decades, several studies on suspension bridges under wind actions have been developed in civil engineering and many techniques have been used to approach this structural problem both in time and frequency domain.
Numerous studies have been focused on their performance evaluation and many techniques have been suggested for improving their thermal efficiency.
The calculation of CSF volume is technically challenging and many techniques have been tried, with varying success.
Throughout recorded history, women and men have been trying to achieve and preserve a youthful appearance, and many techniques have been designed in order to rejuvenate the face.
Enhancing heat transfer surface are used in many engineering applications such as heat exchanger, air conditioning, chemical reactor and refrigeration systems, hence many techniques have been investigated on enhancement of heat transfer rate and decrease the size and cost of the involving equipment especially in heat exchangers.
Valve stiction is a frequent cause of loop performance deterioration and in recent literature many techniques have been proposed for its automatic detection.
These procedures require large amounts of protein extract and stringent experimental conditions, while many techniques have also been deemed best suited for situations where a high affinity ligand binds to a protein [1, 9].
Many techniques have been described to prevent and treat vaginal vault prolapse.
Many techniques have been used to delineate reaction mechanisms, and computational approaches are particularly useful.
